Handbrushable Polyurea
What Is Handbrushable Polyurea
The most common polyurea we know is spray polyurea. But as the development of polyurea technology, spray polyurea cannot meet all the different applications, especially in small area, repairing work, or where it's not convenient to bring a big spray machine.
So that the chemist also developed handbrushable polyurea, such as single component handbrushable polyurea, two component handbrushable polyurea, and polyaspartic polyurea.
These formulations use low activity system, which reduced the reaction time of isocyanate and resin a lot, so that can allow to apply by hand.
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We use the handbrushable polyurea to conpensate for the shortage of large spray equipment. Especially for the small area, like the carage, kitchen floor and children room.
According to the reaction method, there is single component brushable polyurea, and two components brushable polyurea.
Both single component brushable polyurea and two components brushable polyurea can be transparent, while spray polyurea cannot, so we can use this kind of material to do waterproofing on wood, ceramic or anywhere we don't wat to change the original color of the substate.
Single component brushable polyurea is isocyanate react with special amine terminated hardener, which need the moisture to participate in the reaction.
The advantage of single component brushable polyurea is that it can be used directly without weight or mixing, but the disadvantage is that it's usually has little solvent inside, in order to make the viscosity lower.
And because of the reaction method, we should better used single component polyurea as soon as possible once we open it.
There is also aromatic single component polyurea and aliphatic single component polyurea, the difference is the aliphatic is color stable when exposure to the UV, and the cure time of aliphatic single component brushale polyurea is slower than aromatic single component.
Two components brushable polyurea is low activity isocyanate react with amine terminated polyether, there are also aromatic and aliphatic brushable polyurea (polyaspartic polyurea).
The reaction time of two components aromatic polyurea is quicker than two components aliphatic brushable polyurea (polyaspartic polyurea), so that polyaspartic polyurea is much easier to operation.
Two components brushable polyurea is easy to be stored, and it's allowed to add pigment by customers, by adding pigment into the B side.
The advantage of two components polyurea is that it's usually solvent free, which is environment friendly, but the disadvantage is that we need to weight and mixed before use, so that the operation skill will influence on the properties of the materials.
Properties/Advantages of Handbrushable Polyurea
● Prevents moisture penetration, providing complete sealing
● Offers increased resistance to bending and stretching
● Very high mechanical strength
● UV stable
● Excellent bonding to all building substrates such as concrete, plaster, masonry, metal, wood
● Blister free coating. No appearance of holes in the surface during the curing of material
● Dries and cures quickly
● Long pot life
● Crack bridging properties
● Easy to apply
● Long-lasting waterproofing protection
● Ideal solution for waterproofing walkable roofs
● Resistant to temperatures from -35° to +80°
Polyurea Description
The polyurea is a synthetic polymer obtained from the reaction of a diamine with a diisocyanate, polymerization reaction is very similar to polyurethane one, but in case of polyurea, resulting link is a "urea", so it is called polyurea.
By this link we get from generating molecular structure an insensitivity to moisture, thus making the polyurea (if pure) the best waterproof membrane. It is known for its rapid curing time and high strength, making it useful in a variety of industrial and commercial applications, such as construction waterproofing, coatings for truck beds, industrial flooring, and tank linings. Additionally, it can be used as a sealant and insulation material.
Polyurea is a waterproofing material that is often used in industrial and commercial settings to protect surfaces from water damage. It is applied as a liquid coating, which then quickly cures to form a durable, waterproof barrier. This can be used for waterproofing roofs, foundations, decks, and other surfaces. Also used to seal concrete structures, such as swimming pools, water tanks and retaining walls. Polyurea is known for its excellent resistance to water, chemicals, abrasion and impact, which makes it an ideal option for waterproofing surfaces that are exposed to harsh conditions.
We say "pure" because 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.
What Is the Difference Between Spray Polyurea and Brushable Polyurea
The reaction of spray polyurea is very fast, it's usually within serval seconds, so that it can only apply with special high pressure and high temperature machine.
And because of the reaction method of the machine, which we called "impingement reaction" ， even we didn't add pigment into the B side, spray polyurea cannot be transparent, because there are so many tiny little bubbles inside the coatings.
But if we don't add pigment into brushable polyurea, it can be transparent, so that we can use for where a clear waterproofing coating is needed.
We also cannot get a smooth surface by spraying polyurea for big area, because the fog goes everywhere will make particles, but we can get smooth surface by applying hand braushable polyurea, because it's low reaction and has time for levelling.
The advantage of fast reaction spray polyurea is that it can be sprayed on vertical surface without sagging.
By the formulation design, the brushable polyurea can get similar or even better physical property as spray polyurea, but because of the low reaction, it cannot apply thick thickness in one path, so it's low efficient compared to spray polyurea.
But we cannot bring a big spray machine to everywhere, so that for small area waterproofing, such as a small roof, or repairing job, or field area where don't have electricity, hand brushable polyurea is very good to use.
The Pros of Polyurea Coating
Waterproofing
Polyurea forms a seamless, leak-free membrane capable of withstanding permanent ponding water conditions. The polyureas used in commercial roofing are also used in many water containment applications such as reservoirs, pipelines, and wastewater treatment tanks, among others.
01
Durability
Polyurea-based coating systems are incredibly durable and flexible. They possess exceptional elongation and tensile strength, making them ideal for commercial roofing and surface/floor coating applications. They also exhibit excellent chemical, corrosion, and abrasion resistance.
02
Fast-Drying
Polyurea is an extremely fast-setting material. Depending on its formulation, it can cure within seconds to minutes of application.
03
High-Build Application
One of the most significant benefits of polyurea is its ability to build high mils during application. Unlike other coating materials, which require multiple passes to reach the same dry film thickness, polyurea can be applied at a rate of up to 500 mils in one pass.
04
Versatility
Polyurea can be formulated to achieve a wide range of properties based on its application. It fully adheres to a variety of common roofing substrates, including concrete, metal, wood, and spray polyurethane foam, without the use of a primer. It also performs effectively in a wide range of temperatures and humidity levels.
05
Polyurea coatings are often chosen for surfaces because they feature characteristics that roofs, floors, and other areas need but don't have as part of their own construction. With that said, it is easy to apply a coating to supplement a surface and make it last as long as possible.
Here are some characteristics of polyurea coatings that make them suitable for usage on so many different surfaces:
● Waterproof: These coatings provide an effective barrier against water which makes them appropriate for applications that require waterproofing.
● Flexible: They are also known for having great flexibility, which means that when polyurea coatings are applied to surfaces, they are able to withstand movement and abrasive elements without cracking.
● Durable: Polyurea coatings protect surfaces from wear and tear since they are resistant to impact, chemicals, and other environmental factors that could damage a surface.
● Versatile: With the ability to adhere to and create a bond with a variety of surfaces, these coatings work well when applied to concrete, wood, metal, and more.
● Quick-drying: Since polyurea coatings cure in only seconds or minutes, they allow for fast applications and reduced downtime.
● UV resistant: Some polyurea coatings are able to resist UV light which leads to a stronger hold and reduced color fading when exposed to sunlight.
The Process for Applying Polyurea Coating
When you're ready to begin using polyurea coatings in a facility, you'll want to take the following steps:
1. Inspect – Start by inspecting your surface and identify if there are any preexisting coatings present. Take note of any cracks or defects as well and be sure to notify the property owner of any major structural issues that need to be addressed.
2. Clean – Once you have noted any defects and cracks, it is time to start cleaning the surface. Try to get rid of any dirt, dust, grease, wax, or anything else that will prevent a smooth coating job. Use a scrubber or power washer if necessary.
3. Repair – After the surface is clean, you will want to repair the cracks found from step one. Make sure that any repairs conducted are smooth and level.
4. Remove – Use methods like sanding, grinding, blasting, and more to remove any old coatings or paint from the surface.
5. Clean again – Clean up any debris from the preparation work to ensure a smooth application.
6. Prepare – Prepare the area by adding tape and plastic to materials that should not receive the polyurea coating.
7. Mix – Start mixing the polyurea components, following the guide for instructions. Then, spread the polyurea coating using your equipment for a smooth application.
Once you apply the coating, be sure to allow for proper curing time and examine to ensure uniform coating so you can identify any areas which may need fixing later on.
How Are Brushable Polyurea Made
Brushable polyurea based on slow reactive process was prepared by simple, mild and solvent-free method. Firstly, polyurethane prepolymer was synthesized from poly (propylene carbonate) diol (PPCD, copolymer of propylene oxide/CO2) and 4,4′-dicylocyhexylmethane diisocyanate (HMDI). Polyurethane-urea (PPCD–PUU) was then obtained by the chain extension of prepolymer with polyaspartic ester (PAE). The mechanical properties of PPCD–PUU were optimized by adjusting the content of –NCO in the prepolymer and the ratio of prepolymer to PAE. The mechanical strength, thermal resistance, solvent resistance and hydrolysis resistance of PPCD–PUU were compared with those of PUUs derived from polypropylene glycol and poly-caprolactone diol. The results showed that the comprehensive mechanical properties of PPCD–PUU were balanced when the R value was 1.15 and the content of –NCO was 8 %. The tensile strength was 20.5 MPa, the elongation at break was 352 %, and the Young's modulus was 168.2 MPa. Especially, after soaking in 10 % H2SO4 aqueous solution, 10 % NaOH aqueous solution and 10 % NaCl aqueous solution for 24 h, the tensile properties were basically unchanged. Manual applied polyurethane-urea based on commercial PPCD has broad application prospects because it avoids the use of expensive spraying equipment.
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Qingdao Shamu Advanced Material Co., Ltd. the most professional pure polyurea supplier in China, respects science and takes honesty and faith as the foundation of the career. Our company since its inception always gives top priority to product quality, and has developed series pure polyurea products with the latest technology and high quality, and has inaugurated the sample project, model project and monumental project of pure polyurea，which makes you project long-term undertaking with monumental merits that benefit the future!
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