Waterproof material originated in Europe and was introduced to China in the 1920s. After more than ten years of unremitting development, our waterproof coatings have achieved remarkable results in terms of output and product variety. Waterproof technology is also constantly updated to accelerate the diversification of waterproof materials. Polyurethane waterproof coating is one of them. It is an isocyanate-based prepolymer made of addition polymerization reaction of isocyanate, polyether, etc. Anhydrous auxiliaries, anhydrous fillers, solvents, etc. The one-component polyurethane waterproof coating made by mixing and other processes. This type of coating is a reactive curing (moisture-curing) coating with high strength, high elongation, and good water resistance. The adaptability to grassroots deformation is strong. Polyurethane waterproof coating is a one-component environment-friendly waterproof coating for liquid construction. It is based on imported polyurethane prepolymers and has no additives such as tar and asphalt. It is cured by contact with moisture in the air and forms a solid, tough and seamless overall film on the surface of the substrate.
Development history and status of polyurethane waterproof coatings Polyurethane waterproof coatings were first developed and used in the United States. Japan introduced American technology for production in 1964. China began industrial production of polyurethane in the early 1960s, and polyurethane materials were applied to waterproof coatings in the early 1980s. The JC/T500-92 "Polyurethane Waterproof Coating" industry standard was implemented on April 1, 1993. This standard is applicable to two-component polyurethane waterproof coatings, mainly based on tar modification. There is no uniform product standard for one-component polyurethane waterproof.
In 1991, the research and application of polyurethane waterproof coating had been listed as a key promotion project by the state, but the tar-type waterproof coating has a pungent odor, contains a large number of volatile toxic poisons, serious pollution and harm to human health. With the development of society and economy, people’s awareness of environmental protection and advances in science and technology, the ban on the use of tar polyurethane waterproof coatings has become increasingly strong. The Ministry of Construction of the People’s Republic of China made restrictions in 1998 and gradually banned the use of polyurethane waterproof coatings. The decision to use coal tar. Since March 1, 2004, the GB/T19250-2003 "Polyurethane Waterproof Coating" national standard has been officially implemented. This standard adopts relevant parts of the Japanese JISA6021-2000 architectural waterproof coating.
At present, green energy-saving and low-carbon environmental protection have become the development trend of all walks of life. People have put forward higher requirements for green environmental protection of building materials. During the 12th Five-Year Plan period, the Ministry of Industry and Information Technology issued the “Guidance on Eliminating Outdated Production Process Equipment and Products for Some Industrial Industries. The "Announcement of Catalogue" clearly stipulates that tar-based polyurethane waterproof coatings and enterprises with an annual production capacity of less than 5 million will be included in the elimination scope. The introduction of new policies for the waterproof industry has raised the threshold for entry into the waterproofing industry. Zhu Dongqing, chairman of the China Construction Waterproofing Association, said that China's building waterproofing industry is growing at a rate of 30% per year. Due to the rapid development of the industry, some small workshops and small enterprises have produced counterfeit and shoddy products under the drive of interests, which seriously hindered the development of the waterproofing industry. The introduction of the new policy will eliminate water-repellent products and production lines that seriously waste resources and energy, and optimize the industrial structure. The implementation of this policy will accelerate the reshuffle of the waterproofing industry.
Giant companies at home and abroad have 'landing' the polyurethane industry in the "industrial water paint hazardous materials limits" industry standards have been reviewed and passed, the provisions of the standard 'applies to construction waterproof paint and waterproof materials used in supporting materials'. According to the content of harmful substances, waterproof coatings are divided into different grades. Among them, the limit of harmful substances in water-based waterproof coatings is stricter than the stipulated index of “Limits for harmful substances in interior decoration materials for interior wall coatingsâ€, which adds more protection to our home life. According to Zhang Shi's understanding, in the near future, major industry giants are optimistic about the future market development of polyurethane, have increased their investment in polyurethane waterproof coatings. Huntsman expands polyurethane production capacity in India. BASF builds a new polyurethane compound plant in Tianjin, Dow Chemical establishes a new polyurethane technology center in Brazil, Oriental Yuhong develops Yuhong brand APU-601 aliphatic polyurethane topcoat, etc. The polyurethane waterproof coating market has a good prospect. Zhang Shi believes that while enterprises increase their investment, they also need the protection of corresponding national standards and policies. Waterproof material market is not standardized, extensive development, industrial concentration is low, flooding the market with poor quality products often lead to leakage of the housing exposure, which is the current status of the waterproof material industry.
Policy formulation promotes the healthy development of polyurethane waterproof coatings Previously, domestic waterproof coating companies had little interest in newly developed technologies and products, because R&D institutions and manufacturing companies always responded whenever new technologies were required to enter the market. On the point of interest, this not only affected the general promotion of new technologies, but also caused domestic paint companies to lose opportunities for development once and for all. This greatly limits the breakthrough in the performance and quality of the waterproof coating, resulting in a waterproof coating that is not waterproof. Even now, there are still some companies that are holding this kind of mentality in troubled waters. As the waterproof coating product production technology process is relatively simple, the market profit is considerable, and consumers have relatively little knowledge of waterproof materials, some manufacturers and distributors that do not have the qualification to produce, sell and produce poor quality waterproof coatings, resulting in a wide variety of poor quality. Products flood the market and 'win' at low prices, disrupting the market.
It is reported that from May 2009 onwards, 'The first paint environmental protection standard' and the "Environmental Marking Product Technical Requirements Waterproof Coating" were formally implemented. National standard for waterproof coatings: No artificial addition of glycol ethers and their esters, phthalates, diamines, alkyl phenol ethoxylates, branched chain dodecyl benzene sulfonic acid to waterproof coatings Sodium hydrocarbons, ketones, halogenated hydrocarbon solvents. At the same time, national standards for waterproof coatings also set limits for volatile organic compounds, radioactivity, formaldehyde, benzene, benzene solvents, free toluene diisocyanate and other substances in curing agents. It is understood that since the implementation of national standards for waterproof coatings, waterproof coating products that do not meet the standard will no longer allow production. Since July 1, 2010, non-compliance products will no longer be allowed to be sold on the market. The introduction and implementation of national standards for waterproof coatings have raised the barriers to entry and environmental health requirements for the coatings industry, and are conducive to promoting product upgrades and structural adjustment in the coatings industry, helping to standardize the survival of the fittest in the market and promoting the waterproofing industry to a new level.
Waterproof coatings have always been referred to by the industry as small-scale and large-scale markets. Judging from the current development trend, the promotion of national policies has brought tremendous opportunities to the waterproof material market. During the 12th Five-Year Plan period, the construction of affordable housing throughout the country brought considerable market demand to the waterproof material market. As mentioned above, the giants of the industry have seen the prospects of polyurethane waterproof coatings, and have increasingly increased their investment in polyurethane waterproof materials and their investment in scientific research. China's industry leader Dong Yuhong is in line with the international market and has increased its technological research and development capabilities. It will bring a new round of technological innovation to polyurethane waterproof coatings and promote the development of the waterproof industry.
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