Urea-elastomer coatings are produced by the reaction of amino compounds and isocyanates. Developed by the United States in the late 1980s, it has been widely used in the world due to its excellent performance. It is a new, efficient and easy to paint two-component pure polyurea elastomer coating developed after high-solid, powder coating, water-borne coating and uv-curing coating. This kind of high thick film elastomer coating has obvious characteristics: high solid content, green environmental protection, thick and compact and flexible coating, strong adhesion to the substrate, excellent performance of uv resistance, impact resistance, easy to apply. There are many researches on polyurea elastomer coatings at home and abroad.
Feng et al. studied adding different amounts of polyurea elastomers to the polyurea block copolymer coating, and the results showed that when the mole fraction of polyurea content reached 50%, the self-assembly effect caused by hydrogen bond increased the crystallinity of the copolymer, the corrosion resistance of the coating was enhanced, and the surface energy was reduced.
Huang et al. used qtech-412 pure polyurea heavy anticorrosive coating for painting, and conducted exposure and aging in the artificial ocean and atmosphere environment. By using infrared spectrum, DSC and other test performance, the coating has good mechanical and uv resistance, stable structure and excellent corrosion resistance.
Disadvantages of polyurethane putty
But these modification methods for restricting the polyurea elastomer coating and the main reasons for not touched, or raise is not big, because is the main defect of polyurea elastomer coating: too fast curing rate, poor adhesion between the layers, high temperature resistance and corrosion resistance than fluorocarbon coatings, etc., research emphasis should be a detailed study of the various performance, by comparing the different chain extension agent, filler, the influence of the use of coupling agent on coatings performance, so as to develop more excellent comprehensive properties of polyurea elastomer coatings. In addition, the spraying of polyurea elastomer coating is a very advanced technology, and the quality and technology of construction personnel are also the reasons affecting its performance. Secondly, the main raw materials and spraying equipment need to import leading to high costs, is also restricting the development of polyurea elastomer coatings in China an important reason. In the future, it is difficult to research and develop affordable polyurea elastomer coatings.
About the advantages and disadvantages of polyurea putty to introduce in detail the above, as a kind of elastic coating must pay attention to environmental protection safety, can be recognized more consumers to buy, and polyurea putty uv resistance, corrosion resistance, widely used in many places, as polyurea putty also have some disadvantages in the course of using, because the curing speed, high temperature resistance is very strong, how many there are some coating material performance impact. Want to buy good polyurethane putty, need to understand its performance characteristics.
