Polyurethane and other waterproof coatings break the boundary between building materials and coatings
it is reported that traditional waterproof coatings mainly include asphalt, polymer cement, neoprene, one component acrylate polymer lotion, etc., which are not strictly coatings. Therefore, the previous waterproof coating has been called building waterproof material
since the 1990s, with the birth and application of new waterproof coatings such as polyurethane waterproof coating, epoxy resin waterproof coating, polyurea waterproof coating and so on, the boundary between waterproof building materials and waterproof coating has been broken due to the close connection between China's extruder products and strategic new industries. Since the new century, the new waterproof coating has been widely used because of its excellent coating, waterproof and environmental friendliness. The national standard of water-based coating has gradually replaced the traditional waterproof building materials
however, since the state has not issued a standard for the limit of organic and toxic volatile substances in waterproof coatings after the meeting, illegal enterprises have taken advantage of the loophole. In order to reduce costs, these enterprises use a large number of low-quality raw materials in the production process, which greatly reduces the product quality and environmental friendliness
it is learned from relevant aspects that since May 2009, "the first environmental protection standard for coatings" ("environmental labeling product technical requirements waterproof coatings") has been officially implemented. The national standard for waterproof coating stipulates that it is not allowed to artificially add glycol ether and its esters, phthalates, diamines, alkylphenol polyoxyethylene ether, branched sodium dodecylbenzene sulfonate hydrocarbons, ketones, halogenated hydrocarbon solvents to the waterproof coating
at the same time, the national standard for waterproof coatings also puts forward limit requirements for volatile organic compounds, radioactivity, formaldehyde, benzene, benzene solvents, free toluene diisocyanate in curing agent and other substances. It is understood that since the date of implementation of the national standard for waterproof coating, substandard waterproof coating products are no longer allowed to be produced, and substandard products are no longer allowed to be sold on the market since July 1, 2010. Insiders said, "the introduction and implementation of the national standard for waterproof coating has raised the entry threshold and environmental protection and health requirements of the coating industry, which is conducive to promoting the product upgrading and structural adjustment of the coating industry; and is conducive to regulating the survival of the fittest in the market."
note: the reprinted contents are indicated with the source. Ferrography and spectral analysis have their own advantages. The reprint is for the purpose of transmitting more information, and does not mean to agree with their views or confirm the authenticity of their contents
Copyright © 2011 JIN SHI