POLY WATERPROOFING

What is polyurea waterproofing?

There are many reasons the need for waterproofing is so vital.

  • Blocks the growth of mold and fungi, which cause health problems and unpleasant odors.
  • Protects against damage to the interior and exterior of the building, including the materials and the building’s contents.
  • Keeps the building’s structure and prevents leaks
  • It’s a good investment because it will save you from future repairs.
  • Offers security by safeguarding the electrical installation that could otherwise be subject to short circuits where water is present.

In all of these situations, the investment in waterproofing is insurance for keeping the value of your construction on the marketplace.

What are the methods used in polyurea waterproofing?

Before deciding which waterproofing system to select, it is important to know what kind of surface you intend to be working on. It is important to determine the location ( facade, roof, cover pool, etc. ) and if it’s going to be used for transit by people or not, as well as the frequency at which the product will be maintained.

To achieve lasting and durable outcomes, it is vital to adjust the support before installation and always be in compliance with the rules and specifications of the manufacturer. After the waterproofing is completed and you have performed the proper maintenance, a test for water tightness is a way to ensure the integrity of the product.

  • A safe, effective, and popular method of preparing is asphalt material, especially in sheets.
  • The injection of polyurethane to fill fissures and cracks are an innovative method to stop leaks.
  • EPDM sheets (cold applied ethylene rubber) provide excellent resistance to weather and mechanical wear. Additionally, they allow large areas to be waterproofed in one piece.
  • Acrylic waterproofing is a liquid composed of synthetic resins and glass fibers. They are utilized to form an impervious and waterproof layer.
  • Natural waterproofing, Although less frequently, does serve a purpose. This is true for slate, granite, silicon ceramics (tiles) cement, fiber cement derivatives. Metals (aluminum stainless, galvanized and zinc, steel, copper, …).

The waterproofing of polyurea produces a highly durable waterproof membrane.

What are the benefits of waterproofing using polyurea in comparison with other options?

It allows for a uniform layer of application free of joints, is extremely flexible, and adapts to any irregularity on the surface. Its sprayed application can cover areas with uneven surfaces or complex geometrical shapes, forming a uniform layer.

It provides outstanding mechanical chemical and solar protection for a prolonged period, making it an extremely profitable investment. It is watertight and has total immunity to humidity.

Polyurea also has outstanding adhesion to any material. It is resistant to the effects of corrosion and can be applied on wet substrates.

Furthermore, the waterproof area can be used throughout the day after the application and allows the public to walk through.

Based on the information above, it is clear that waterproofing using polyurea is ideal for roofing, facades and balconies, terraces, swimming pools, and tanks, as well as other things.

If you would like to learn more about polyurea waterproofing or become an applicator, click here.

self-heal-polymer

Self Healing Polyurea Of The Future: Elastic Polymers Heal at Molecular Level After Cut

Scientists create an inexpensive self-healing polymer

Building semiconductors, orthopedic implants, and hydrogen fuel cells are just a few of the potential uses of a polymer created in the lab of a materials science and scientific engineering team at the University of Illinois. This university scientific team created the Hindered Polyurea material two years ago. Still, the team of undergraduates recently discovered that its sacrificial properties give it added commercial appeal in addition to its self-healing qualities.

They call the new polymer a ‘Hindered’ polyurea because they put a different functional group to the existing urea chemistry to make it so. It’s this ‘hinderedness’ that makes it dynamic.

The team is now set to commercialize the technology, focusing first on the sacrificial properties of the polymer: the fact that the urea bond is stable at room temperature but vaporizes when heated to 150 degrees Celsius.

The technology is especially useful when you want to create empty channels inside of bulk materials. They realized the technology could solve many of the existing problems in fabrication.

In manufacturing semiconductors, for instance, there needs to be channeled within the circuitry. Using their technology, the semiconductor would be layered around the polymer then heated up, causing the Hindered Polyurea material to vaporize and leaving holes inside the semiconductor.

While a similar method is currently employed in this kind of fabrication, the common materials used, such as polystyrene or polycarbonate, need to be heated up to 400 degrees Celsius and leave behind a residue that can cause other complications.

This technology is not revolutionizing the concept, but it’s an evolution – the next step forward for getting the process to be cleaner and cheaper. The existing degradable materials need a higher temperature to vaporize, severely limiting what exterior materials you can use. You need a strong original base for other materials, but it’s much easier for their material.

Another application targeted for the technology is titanium orthopedic implants.

One issue doctors face is that if you make the artificial joint out of a solid block of titanium with welding edges and other imperfections from putting separate sections together, the body recognizes it as a foreign object and might reject it. If you make it porous, like a honeycomb structure, the osteoblast cells from your bone go inside the titanium material and incorporate it into the bone in a process called osseointegration. They start developing their structures within those pores.

Yet another application is the production of hydrogen fuel cells, which might be highly in demand for future power automobiles.

Channels within each fuel cell are needed to allow liquid to flow through convection cooling to lower the battery’s temperature.

Although the team focuses on sacrificial applications at the onset, the group certainly sees many future applications for Hindered Polyurea as a self-healing material, especially in structures that see a lot of fatigue and stress, such as bridges and fuel tanks.

A lot of self-healing materials need some catalyst to work. This groups technology self heals at room temperature. The traditional Polyurea material is very stable and strong, which is good, but there isn’t much dynamicity.

Polymer regenerates all by itself | Research | Chemistry World

Hindered Polyurea is one of 18 finalists in the Cozad New Venture Challenge, sponsored by the University of Illinois Technology Entrepreneur Center. They will make their final pitches to judges as part of the Entrepreneurship Forum on April 28 at the Illini Union. The team is still in the material development stage, prototyping some empty channels and integrating them into some existing products. It uses Cozad to determine the niche market, narrow the specific target applications, and develop a business plan.

Cozad allowed them to find the right questions to ask. First, it narrowed down what research they needed to do from a commercialization perspective. Secondly, it allowed them to get their name out there.

So far, they have found this material to be cheaper, more efficient, and cleaner than other competitors. The difference in all three of those segments between their technology and existing materials is big enough that if they can get to a level of scale and market it, They think it would be adopted and would change many industries.

nrldevelopsl

Chemists developed lightweight, field repairable transparent polyurea type polymer

Research chemists at U.S. Naval Research Laboratory (NRL) have developed and patented a transparent thermoplastic elastomer armor to lower weight, inherent in a lot of bullet-resistant glass, while maintaining superior ballistic homes.

Thermoplastic elastomers are soft, rubbery polymers converted by physical means, rather than a chemical process, to a solid. Subsequently, the solidification is reversible and allows harmed armor surface areas to be fixed ‘on-the-fly’ in the field.

” Heating the material above the softening point, around 100 degrees Celsius, melts the little crystallites, allowing the fracture surfaces to meld together and reform through diffusion,” stated Dr. Mike Roland, senior researcher, NRL Soft Matter Physics. “This can be achieved with a hot plate, akin to an iron, that molds the freshly forming surface into a smooth, flat sheet with minimal result on stability.”

Already, NRL researchers have evaluated the use of polymeric products as a coating to accomplish improved impact resistance of difficult substrates. Applying polyurea and polyisobutylene layers boost the ballistic performance of armor and helmets, and accomplish higher ballistic efficiency and mitigation of blast waves.

By using a variation of employing thermoplastic elastomers, NRL scientists are able to recreate remarkable ballistic properties of polyurea and polyisobutylene coatings, with the added advantage of the product being transparent, lighter than standard bullet-resistant glass, and repairable.

“Because of the dissipative homes of the elastomer, the damage due to a projectile strike is restricted to the effect locus. This implies that the affect on presence is practically inconsequential, and multi-hit protection is achieved,” Roland said.

Diagram EpoxyPolyspart

The Showdown: Epoxy vs. Polyaspartic Coatings

Epoxy Coatings vs. Polyaspartic Coatings

Ever since the creation of the first concrete floor, humanity has searched for a way to protect and beautify the surface. Epoxy coatings have been around since the 1930’s and have since taken off to become one of the most popular protectors of concrete floors. Fairly new to the party, polyurea polyaspartic coatings have quickly become the darlings of those who want a fast dry time. Let’s examine each of these contenders and see how they stack up against one another.

Epoxy Coatings

Epoxies are resin polymers made of epoxide units, cyclic three-atom ether rings containing an oxygen atom, and two carbon side-groups. The triangular units are electronically strained and are therefore very reactive. Normally, epoxy resin is produced by reacting bisphenol A and epichlorohydrin, but variants popular for concrete floor applications involve novolac and aliphatic epoxy resins. A typical application consists of an epoxy primer, a color base coat, and two polyurethane layers.

Benefits of Epoxy Coatings:

  • Not unreasonable in price
  • Creates a hard, decorative finish
  • You have many finish options, including color and mix-ins
  • Very tough
  • Unyielding to chemicals
  • Good adhesion — won’t raise
  • Long pot life, allowing it to be applied with a manual gun

Drawbacks of Epoxy Coatings:

  • Less flexible and less resistant to abrasion
  • It can be moderately difficult to apply in hot or cold conditions
  • It has a longer drying time
  • Has potentially hazardous vapors, although recent formulas have fixed this
  • May not be colorfast — subject to fading or yellowing from UV exposure, though many formulations include UV protection
  • It cannot be applied when the temperature is below freezing

Polyaspartic Coatings

First introduced in the 1990s, polyaspartic coatings arise from aliphatic polyisocyanate reacting with polyaspartic ester, a diamine. The compound is known as an aliphatic polyurea, which is quite different from conventional polyureas and, in many ways, better. By tailoring the relative amount of the ester, scientists can craft different polyaspartic coatings with various features. For garage floor applications, the ester is the main component, ending in low emissions and quick drying. When applied to grey concrete floors, polyaspartic floor coatings produce a glossy, almost watery tone that customers can color. In some applications, decorative chips are spread on the still-wet topcoat.

Benefits of Polyaspartic Coatings:

  • Easier application in a wide variety of cold and hot conditions
  • Hard, smooth finish that is stain- and scratch-resistant, great for high-traffic spaces
  • Clear and non-sticky when hard
  • Fast-drying times cures to full strength in 20-30 min
  • Colors and decorative chips possible
  • Colorfast, even when utilized to slightly damp concrete
  • Low VOCs and odor
  • Low viscosity gives it good wetting capacity on concrete but requires a reduced rate of solids
  • High, controllable film build-up
  • Not likely to bubble from outgassing

Drawbacks of Polyaspartic Coatings:

  • The relatively new product, professional application suggested
  • Short pot life needs the use of automatic application guns
  • Two to three times more costly to purchase and apply
  • Must avoid high moisture vapor emission rate conditions when utilizing
  • We might have to thin the first coat for better adhesion
  • It doesn’t hold up as well to battery acids
  • Very slippery when wet, so a top aggregate such as chips suggested
TOP COAT FLOOR APPLICATION

10 REASONS YOU SHOULD ADD A CLEAR TOP COAT TO YOUR FLOOR COATING

Why should I apply a clear topcoat to my garage floor coating?

This is an understandable question that pops up from time to time for the typical house owner wanting to save some cash. The real concern, nevertheless, ought to be, why would not you apply a clear coat? After all, there are many benefits to adding a clear topcoat over the garage floor’s color coat.

Anybody who has installed a garage floor coating correctly will tell you that the most laborious and time-consuming part is prepping the floor for the coating. Using the coating goes fast, and for numerous, it is the fun part of the job. So, after all that work of getting the concrete all set, why wouldn’t you want to invest a little bit more time and money to guarantee a longer-lasting and even more stunning floor coating?

With multiple clear coating options to select from, epoxy, polyaspartic, and polyurethane are the most typical choices. The exact same benefits can apply to making use of all three mentioned floor finishes. So to respond to these questions, let’s take a look at the top 10 reasons that you should apply a clear topcoat to your garage floor.

1. ADDS DURABILITY AND WEAR

A clear coat will add sturdiness to your garage floor coating and make for a longer wearing surface. The additional coat also includes thickness to the floor coating, removing hot tire lift and soaking up effects better.

2. PROTECTS THE COLOR COAT

Due to the fact that the clearcoat functions as a sacrificial layer, the epoxy color coat will be secured. Without it, the colored epoxy coat can lose its radiance from wear. Though resistant to the majority of chemicals, some oil spills or leakages allowed to sit for long periods can blemish the coating depending on the quality of epoxy you applied.

3. SAFEGUARDS THE COLOR FLAKES

If you used paint chips or color flakes to your floor, the clear coat would safeguard them from peeling up and collecting dirt. Considering that the color flakes are partially embedded into the epoxy, dirt and grime can gather in and around the flakes’ edges, making it more difficult to keep tidy depending on the number of colors flake was applied.

Cleaning of the floor and other activities can likewise trigger color flakes to bring up or chip away. When a clear coat is added, the color flakes are protected by the clear layer over them.

4. IT IS EASIER TO CLEAN

With a clear coat over the color flakes, the floor is likewise much easier to clean up. Dust mops can slide over the floor without capturing color flakes as it goes. This is particularly true if you have heavy flake protection on your floor. It likewise enables aggressive scrubbing if essential without the worry of losing color flakes or dulling the color coat.

5. ADDS DEPTH TO THE FLOOR COATING

The additional layer of a clear leading coat includes depth to the appearance of the garage floor. This creates a richer looking surface that appears more luxurious and much thicker than it is.

6. DEVELOPS A GLOSSIER LOOKING FINISH

Depending upon which kind of clear coat you select, the clear will include a shiny shine to the floor that will reflect light much better than the color coat. Polyurethane finishes are sometimes offered in different levels of gloss.

This is a great choice for projects in the garage or working on cars merely because it develops more light. It might also indicate that you will not have to incorporate more overhead lighting like you believed you may require.

7. IT HIDES SCRATCHES BETTER

All garage floor finishings will develop microscopic and in some cases bigger scratches on the surface of the coating. A clear topcoat helps conceal or camouflage most of these scratches, so they are less noticeable and do not detract from the floor’s looks. This is because the clear leading coat will function as the sacrificial layer and prevents the color coat from being damaged.

8. IT’S A GOOD MEDIUM FOR ANTI-SLIP ADDITIVES

Anti-slip ingredients are concealed better in a clear coat. Because a lot of additives are translucent in color, they will not stand apart. Without a clear topcoat, they are contributed to the color coat rather. This makes the anti-slip granules a lot more noticeable as little bumps resembling sandpaper on the garage floor.

9. CAN BE RECOATED TO LOOK NEW AGAIN

After several years of use, an epoxy garage floor coating can start to show its age depending upon how much activity it has seen. If it had a clear topcoat of epoxy or polyurethane, it might easily be roughed up with sandpaper and have a brand-new coat of clear used.

The old topcoat’s sanding removes any acnes, scratches, and other flaws that the floor coating obtained throughout the years. As soon as the new clear coat is used, your garage floor coating will look brand new once again.

10. IT JUST LOOKS AWESOME!

When you compare a color layered epoxy garage floor with a top coat of clear to one that does not, there is no question about which looks better. The clear coat is what provides the garage floor that extra depth and showroom shine that screams, “take a look at me!”

So if you’re on the fence about whether or not to add a clear topcoat to your garage floor coating, consider all the benefits it will provide in the long term. Yes, it will cost a bit more money, and yes, it may indicate another day of being without your garage. However, as soon as you do, you will be rewarded with a garage floor to be happy with for several years to come, and you will be glad that you did it.

If you are unsure of what type of topcoat to incorporate into your floor project, we recommend going with a product called ArmorFloor. Its produced by ArmorThane and is a two-part polyaspartic. To learn more about using this product, check out this article on applying it.

Pump-Refurbishment-Coatings

Polymer Coatings For Water Treatment Equipment

The purpose of water treatment is to cleanse drinking water to satisfy federal government guidelines for quality and produce wastewater effluent that has a minimized effect on the environment. Water and wastewater treatment plants (WWTPs) use different phases to speed up the natural processes that purify water and wastes. Whatever methods, equipment, or technologies are used, pumps are a necessary element for moving raw water, waste water, sludge, and effluent within various processes. With high global demands for energy, the industry is looking for pumping systems that take full advantage of performance, reliability, and cost-effectiveness.

Decreases in pump efficiency can be caused by mechanical, volumetric, and hydraulic losses. Mechanical loss is related to moving elements of a pump, such as bearings and glands. Volumetric loss refers to leakage of fluid from the discharge side of the pump to the suction side. Hydraulic loss is triggered by the frictional forces developed in between the fluid and the walls of the hydraulic passage, velocity, and the modification of the fluid direction. Therefore, smooth pump walls reduce circulation variations and, subsequently, the energy required for the pump to move the fluid. This post goes over the use of state-of-the-art lining innovations to increase the performance of pumps while protecting their internal surfaces from disintegration and deterioration.

Result of Pump Surface Roughness
The two categories of pumps most typically used at WWTPs are the centrifugal and positive displacement pumps. Centrifugal pumps are more common since they are easy and safe to run under a broad series of conditions. The operating concept of moving a fluid by means of mechanical actions can be detrimental to the internal components of the pump. For instance, centrifugal pumps are vulnerable to damage and efficiency destruction by cavitation, where vapor bubbles form in the low-pressure region directly behind the turning impeller vanes. The collapse of these bubbles can damage the impeller and deteriorate the pump casing.5 Pressure drop control in pumps is typically limited, and cavitation can not be prevented. Over time, cavitation can produce severe erosion-corrosion issues.

The roughness of pump surfaces impacts the fluid flow.

As the roughness increases, the laminar circulation becomes unstable and shifts into rough circulation. Erosion-corrosion mechanisms are intensified under unstable circulation conditions. Surface area flaws in the form of small protrusions or anxieties, such as corrosion pits, deposits, and weld beads, can trigger disturbed flow on a smaller sized scale. Although small, such problems suffice to start the erosion-corrosion processes in the form of impingement, cavitation, and even entrainment in the presence of solid particles.6 Under these situations, energy losses will occur and lead to more decrease in effectiveness of the pumping system.

Alternatives for Pump Efficiency Improvements.
Standard options to mitigate the unfavorable repercussions of turbulent flow programs include devices design adjustments to reduce hydrodynamic forces and using exotic, erosion-resistant alloys as materials of building and construction. However, due to cost, relieve of construction, and accessibility, the products of construction most frequently picked are cast iron, carbon steel (CS), or stainless steel (SS). The resistance of these conventional products to rust and disintegration is relatively low; and in the case of SS, localized corrosion can still take place when its protective passivation movie is damaged or exposed to chloride environments.

Another method to minimize erosion-corrosion and enhance performance is to isolate the metal surface area from its contact environment with a lining. Numerous benefits of this option can be mentioned:8.

1. Lining pumps made of CS with fit-for-service coatings provides an economical approach of improving the rust resistance of standard materials when compared to using corrosion-resistant alloys or cladding.

2. Lining products are readily offered if needed, even at short notice.

3. Lining products do not add substantial weight to the pumps. Sometimes, linings can facilitate a reduction in weight because of a reduced corrosion allowance for the metal based upon lower awaited disintegration and deterioration rates.

4. Efficient lining application methods enable much shorter project preparations and less equipment downtime.

A wide variety of corrosion-resistant coating innovations can be used for securing the interiors of pumps. Some of them include glass flake, thermosetting polyurethane, and nonsolvent-free epoxy coatings. Making use of a few of these coatings is limited by the presence of volatile organic substances (VOCs) in their structure, which may trigger health and safety issues. Others have bad mechanical adhesion and lowered resistance to erosion and rust. Due to technological advances in protective commercial linings and repair composite materials, it is now possible to utilize polymeric materials for coating systems with exceptional resistance to erosion-corrosion and cavitation. These high-technology linings can efficiently boost pump efficiency.

FIGURE 1 Pump efficiency curve.

Coatings Designed with a Unique Combination of Properties.
Pump efficiency curve.State-of-the-art coating innovation has resulted in coatings with special chemistry. Enhanced erosion-corrosion resistance, hydrophobicity, and hydraulic smoothness are qualities that allow high energy effectiveness and optimum pump efficiency to be achieved. These coatings are essentially created as a blend of lube agents and abrasion-resistant fillers. The fillers are utilized to reduce erosion-corrosion wear, whereas a mix of various amines offers a smooth finish and low electronic affinity towards water molecules. As a result, the beginning of rough circulation is delayed, which consequently lowers skin friction.

These coatings are solvent-free, epoxy-based, and free of VOCs so health and wellness concerns are minimized and item shrinkage is avoided. Coating systems can be applied in fairly thin layers to circumvent any flow restriction issues. Linings have been reported with a surface roughness of 0.09 µm vs. 1.19 µm for polished SS. The ultra-smooth surface, in addition to self-levelling and hydrophobic properties, lessen turbulence and surface area tension.

These high-performance coatings were tested for service physical fitness in alignment with globally recognized approaches such as those supplied by ISO, NACE International, and ASTM. Such coatings have actually reported adhesion worths greater than 31 MPa (4,500 psi) on grit-blasted moderate steel when tested in accordance with ASTM D45419 and ISO 4624.10 Atlas cell testing, in accordance with NACE TM0174,11 is likewise utilized to figure out the suitability of these coatings in immersion service. Chemical testing using ISO 2812-112 is another test required for assessing the resistance of coatings to the range of chemicals found in the WWTP. Some of these chemicals include chlorine, ferric chloride (FeCl3), and sodium hypochlorite (NaClO).

In addition, these protective coatings can be checked for potable water contact in agreement with the U.K. Drinking Water Inspectorate.

Pump Efficiency.
The efficiency of a centrifugal pump is normally explained by a graph that plots the pressure produced by the pump over a series of flow rates (determined in terms of head). Likewise, its performance is consisted of on a common pump performance curve. The effectiveness of a pump is the ratio of the pump’s fluid power to the pump shaft power. A centrifugal pump has a best effectiveness point (BEP) where it runs the most cost-effectively in regards to both energy effectiveness and upkeep. Continually running a pump at its BEP is difficult due to the fact that systems typically have changing demands.4.

FIGURE 1 Pump efficiency curve.
Power vs. flow curve.

A pump efficiency test in 1989– carried out by the National Engineering Laboratory (then part of the United Kingdom’s Department of Trade and Industry), a global reference in fluid circulation screening that represents the most thorough pump test facilities worldwide– recognized performance enhancement of a centrifugal pump that was lined.14 The tests were carried out in a single stage, end-suction centrifugal pump with 10-in (254-mm) suction and discharge branches. The pump (in an uncoated condition) performed at 1,300 rpm, had a capability of 875 m3/h (5.55 countless gallons per day [mgd] at 26.5 m head, and total peak performance of 83.5%.14 The exact same pump was then protected with a lining to demonstrate that boosted pump effectiveness could be attained.

The coating examined was a solvent-free, two-component epoxy system, specially developed for improving the performance of fluid-handling devices and securing metal surfaces from the effects of erosion-corrosion. This coating was used in 2 colors to validate the 2nd coat had actually been evenly used and completely covered the first coat, and to make future assessments much easier to assess. The two pump tests were carried out in a normal closed-loop system using the same protocol, with a series of flow, head, and power readings taken throughout a wide circulation range. The pump effectiveness curve, developed with calibrated test instrumentation and traceable to nationwide requirements, was then plotted (Figure 1).

FIGURE 3 Erosion-corrosion results to the impeller.

Checking results of the covered pump showed a 6% increase at peak performance (Figure 1). Substantially, there was little change to the pump head/flow characteristics, meaning the coating increased the pump performance while maintaining the original head/flow properties. The power decrease of 5.1 kWh was attained at responsibility point.

History.
A state federal government water and wastewater treatment business in Bahia, Brazil employed a lining to safeguard a centrifugal pump and increase its performance. This water and wastewater business is responsible for operating and keeping 431 water treatment systems and 94 wastewater plants throughout more than 360 municipalities in Bahia. The water treatment plants supply drinking water for 11.9 million individuals, whereas the wastewater plants provide sanitation to ~ 4.8 million people.15.

FIGURE 4 Coated impeller.
Coated impeller

.In 2006, the plant maintenance personnel of among these plants discovered anomalies in their process, primarily due to mechanisms of erosion-corrosion and cavitation in the pumping system. The possession, a Worthington † split-case centrifugal pump with a capability of 1.080 m3/h (6.84 mgd), was installed in the pump system to catch raw water from the São Francisco River for treatment and shipment to the neighborhood. This pump was experiencing localized metal loss and corrosion, mostly in the volute case and impeller (Figure 3). Numerous repair options were thought about by the asset owner. The choice was made to utilize a 100% solids epoxy-based lining to secure the harmed internal parts of the pump. The work was performed by authorized applicators following the lining maker’s product guidelines for usage, as follows:.

– The malfunctioning parts were abrasive blasted to achieve surface cleanliness requirements of NACE No. 2/SSPC-SP 1016 and ISO 8501-1 (Sa 2 1/2),17 with a minimum typical profile of 3 mils (75 µm).

– The surface areas were checked for salt contamination and dealt with accordingly.

– The surfaces were washed down with appropriate cleaner/degreaser to remove residual blasting debris and any grease impurities.

– The thickness of the pump wall was restored according to the original equipment producer’s pump repair standards using paste-grade epoxy products.

– The protective coating was by hand applied in 2 coats of contrasting colors to obtain a minimum total dry movie density.

– The lining was allowed to cure for chemical service (Figures 4 and 5) and more inspected for connection.

FIGURE 5 Coated volute.
Coated volute

Results
The pump was returned to service. After 6 years of continuous use, the pump was opened for evaluation by upkeep workers. Some erosion wear and metal loss from moderate cavitation could be seen on the volute surface area (Figure 6), but the lining remained in good condition. The plant supervisors were satisfied with the results. The pump had been protected against cavitation and corrosion for 6 years. The procedure is now part of their preventive upkeep program.

The pump likewise was tested to examine both the energy intake and the cost of power intake savings associated with running a more efficient pump. Direct measurement of motor current was chosen to properly evaluate improvement of the pump’s effectiveness. Electric current readings were taken on the motor of an uncoated and covered pump under the exact same conditions. The readings for the uncoated pump revealed an average of 72 A with 440 V, whereas readings reported an average of 66 A for the layered pump. The results showed an amperage decrease of 8.33% and a consequent reduction in the power usage, because these variables are directly proportional.

These outcomes showed that this coating technology efficiently added to decreasing losses by safeguarding the surface versus the impacts of erosion-corrosion and cavitation. Creating a smooth, hydrophobic finish also resulted in a reduction in energy consumption. Ever since, the exact same efficiency-enhancing polymeric coating was applied to eight of the 12 pumps at that pump station. The results can be reproduced for other types of pumps.

FIGURE 6 Erosion areas on the volute after six years of service.
Erosion locations on the volute after 6 years of service.
Conclusions.


The polymeric coating innovation proved to be a suitable alternative for improving the performance of the pump, as well as protecting it from deterioration, with very little maintenance work throughout its designated life time. The technology is recommended for protecting pump surface areas and boosting pump effectiveness within water and wastewater plants.

As anticipated, cavitation effects were not eradicated however minimized; nevertheless, the boost in fluid flow efficiency represented an instant saving in power usage, one of a lot of significant business expenses for water and wastewater treatment plants.

service-one

POLYMER STUDY: What Is Polyurea?

Polyurea is a synthetic polymer obtained from the response of a diamine with a diisocyanate, polymerization response is really comparable to polyurethane one, but in case of polyurea, resulting link is a “urea”, so it is called polyurea.
By this link we get from creating molecular structure an insensitivity to moisture, hence making the polyurea (if pure) the very best waterproof membrane.
We state “if pure” due to the fact that in the market there are numerous polyurea-called “hybrid”, which are a mixture between polyurea and polyurethane. These membranes do not have the same mechanical properties as the pure polyurea (elongation, abrasion resistance, etc …). The following chart plainly shows the distinction.


Pure Polyurea

What is Polyurea
Isocyanate + Polyamine

Molecular structure entirely insensitive to wetness. Pure polyurea does not react with water making it the very best waterproofing material.

HYBRID POLYUREA

Hybrid Polyurea

Isocyanate + Polyol + Polyamine

A polyol participates in the molecular structure of the hybrids, which gives it properties halfway in between pure polyurea and polyurethane.

POLYURETHANE

Polyurethane

Isocyanate + Catalyst + Polyol

Polyurethane needs a driver in its structure which adds an extra molecular bond. Excellent waterproofing product however with lower mechanical properties than polyureas.

Polyurea types (pure).
Depending upon polyurea chemical structure, it could be of 2 types: aliphatic or aromatic.
The fragrant polyurea is more solid and not withstands UV exposure, triggering some discoloration and loss of shine, which is not advised for applications “deal with side”. On the contrary, aliphatic polyurea is resistant to UV radiation and it is excellent as a finish coat, because of its raw materials high expenses, it makes it a polyurea of greater rate variety.

Polyurea application.
The application of the polyurea is usually performed in hot state; for that is needed a hot spraying plural parts (2-components) equipment under high pressure (type GRACO Reactor E-XP2). This devices can offering a pressure of 2700 psi at a temperature of 70 ° C. This sort of polyurea dry just in 3 or 4 seconds as soon as applied.
There is likewise the called cold polyurea or polyurea cold applied, it not requires a spraying equipment since it is processed manually utilizing a rubber float, spatula or trowel. This polyurea takes longer to dry than faster one hot sprayed.

Benefits and Properties of Polyurea.
There are lots of advantages and properties of polyurea membrane, then the most important detail:.

membrane without joints or overlaps and of optimum flexibility – as much as 600% elongation.

Polyurea uses.
Polyurea properties make it a product for applications where waterproofing, defense and resilience are fundamental. The limitless possibilities for polyurea pigmentation are a clear benefit in those applications where the visual aspect plays an essential role. The versatility and adhesion of the polyurea enable use in practically any application requirement waterproofing, coating and/ or protection can include: waterproofing and corrosion security on steel, concrete and many other supports.

Polyurea varieties.
At Polymer World, we are continuously innovating in the development and advancement of new items and the improvement of existing formulations. Currently, we have different coatings according to your needs. Contact us for more info.