Do you know the concept of indoor wall paint in the concept of brushing the wall a few days ago? In today's fast-changing day, scientists have developed a dust-free, strong adhesion and friction-resistant coating due to its unique molecularity. The structure, called polyurea coating, is a high-tech disposable coating process. Then let Xiaobian take everyone to look at the exciting content of polyurea coatings .
First, the characteristics
(1) The coating does not contain catalyst, fast curing, can be sprayed on any curved surface, inclined surface and vertical surface without sag phenomenon, 5s gel, 1min can reach walking strength.
(2) The paint is not sensitive to moisture and moisture, and is not affected by ambient temperature and humidity during construction.
(3) The coating is 100% solid content, does not contain any volatile organic compounds (VOC), and is environmentally friendly.
(4) It has excellent physical and chemical properties such as tensile strength, elongation, flexibility, abrasion resistance, aging resistance, corrosion resistance and the like. (5) It has good thermal stability and can be used for a long time at 120 °C, and can withstand short-term heat at 150 °C.
Second, the chemical equation of each reaction
Polyurethane reaction: R-NCO + R'OH catalyst RHNCOOR'
Polyurea reaction: R-NCO + R'NH2 RNHCONHR' isocyanate reaction with water: R-NCO + H2O catalyst RNHCOOHRNHCOOH RNH2 + CO2 ↑ (gas) spraying equipment construction parameters
Main heater temperature: A material 70 ° C R material 75 ° C
Long tube holding temperature: 70 °C picking pump pressure: A material 80~90psi R material 80~90psi air pressure: 80~90psi dynamic pressure: A material 2200psi R material 2200psi
Third, the working principle of spraying equipment
The working principle of the spray polyurea equipment is that A (isocyanate component) and R (active hydrogen component) are respectively transferred from the drum to the main machine via respective pump, metered, pressurized, heated, and then sent to the spray gun. , sprayed after the spray gun is mixed. Metering conveyors and mixing systems are the two main systems of spray equipment.
Therefore, spray polyurea equipment must have: a smooth material handling system, a precise material metering system, a uniform material mixing system, a good material atomization system and a convenient material cleaning system.
Fourth, technical indicators
With the continuous development of polyurea elastomer coatings, in order to standardize the development market of polyurea, China established the chemical industry standard of "HG/T3831-2006 spray polyurea protective materials" in 2006, and established GB/T23446-2009 in 2009. The national standard for spraying polyurea waterproof coatings, the standard for spraying polyurea waterproof engineering technical specifications is being established.
How about, I read the above introduction to polyurea coatings, and I have learned a lot about polyurea coatings. I hope that you can learn more about home improvement knowledge through this article, and you will be able to create a more perfect home environment. Thank you for reading this article and your support and love for Xiaobian. If you want to get more information about home improvement, please continue to pay attention to the decoration home network.
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