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According to the project leader Professor Wu Limin, director of the Advanced Coatings Engineering Research Center of the Ministry of Education and director of the Department of Materials Science at Fudan University, reducing the VOC emissions has become the consensus of the global coating industry while pursuing high performance. China is the second largest producer and consumer of paint after the United States. However, the development and production of mid-to-high-end resins and coatings has long been dominated by imitation, and can only rely on imported resins and pigments to adjust formulations. Due to the inability to form its own core technology and the lack of research on the design and preparation of key raw materials such as resins and pigments, China's competition in the field of resins and related coatings with foreign countries has long been disadvantageous, and high-end coatings such as automotive and electronics industries have been undermined. The market is almost monopolized by foreign companies, and core intellectual property rights are controlled by foreign scientific research institutions and companies.
Professor Wu Limin said that to achieve high performance and low VOC emissions can be achieved by two methods: one is water-based, which is commonly referred to as water-based paint; the second is to increase the solid content of oil paints. Acrylic coatings with acrylic resin as the film-forming substance have become the most used ones in architectural coatings due to their excellent weatherability, water resistance, acid and alkali resistance, stain resistance, non-toxicity, and environmental friendliness. Products. At the same time, the proportion of high solids acrylate coatings is increasing in the top coats and middle coats of the automotive industry, especially cars. To this end, under the support of the national "863" program and Shanghai's related science and technology plans, they chose the acrylic resin, the coating's most productive and widely used coating resin, as a breakthrough. At present, they have applied for 11 Chinese invention patents and 2 international patents around this project, of which 10 Chinese patents and 1 US patent have been authorized, and 53 international SCI papers have been published.
According to Professor Wu Limin, as the solid content increases, the viscosity of the system will increase, and subsequent deployment and construction work will become increasingly difficult. In order to increase the solid content and reduce the organic solvent content in the system, it is necessary to effectively control the molecular weight and distribution of the resin. In order to solve this contradiction, they invented the separation and polymerization technology of high solids acrylic resin, and increased the solid content of the resin solution while ensuring that the system has a lower viscosity.
Afterwards, the researchers also obtained a high-solid-low-viscous nanocomposite acrylic resin by surface modification of the nano silica sol. Due to the difficulty in dispersing and agglomerating inorganic nano-particles in nano-coatings, the solid content of acrylic resin prepared by them is above 90%, and the coating performance partially surpasses that of foreign high-solids solvent-based coatings. The technology has been industrialized in Guangzhou, and its products have been used in a number of well-known manufacturers of automobiles, motorcycles, and home appliances, partially replacing imports.
Wu Limin believes that water-based paints use water as a solvent, and there is no doubt about environmental protection. In general, however, the overall performance of waterborne coatings is still somewhat different from that of oil paints. In order to overcome the above drawbacks, they invented a new technology for the preparation of acrylic resin-free soap-free emulsions without any conventional emulsifiers: the use of nano-silica surfaces has weak or negatively acidic silyl groups and hydrophilicity, and the electrostatic properties Or acid-base interaction, so that the nano-silica particles are adsorbed to the monomer droplets and the surface of the generated acrylic latex particles during the polymerization reaction of the monomers, function as an emulsifier, and solve the problem that the synthesis of the conventional acrylic resin emulsion requires a large amount of The problem of organic small molecule emulsifiers. In addition, they have further devel- oped and invented the preparation techniques for high- and low-viscosity nanocomposite polyesters and coatings, as well as silanized polymer post-emulsion preparation techniques using nano-silica particles as emulsifiers.
At present, this technology has been industrialized in Jiangsu and Shanghai, and the produced water-emulsion acrylic resin coating has less than 5% stain resistance (the national standard is 15%, the smaller the number, the better), self-cleaning, and artificial acceleration. The aging time is up to 1600 hours. Due to the easy adhesion and easy discoloration problems that are easily encountered in the external coating of architectural projects, this innovative result can be seen in major national projects such as the CCTV building and studio, the Expo and its relocation projects.
High-end Acrylics: From Imitation to Innovation
The walls of the building are coated with magic paint. The dust stuck to the wall can flow down the rain, keeping the walls clean and tidy for a long time. The parts of cars and motorcycles are covered with a protective coating, even if they are made of hard materials. "Intimate contact" will not leave a trace. The high-performance acrylic resins and application technologies independently developed by Chinese scientists and technicians have enabled Chinese architectural coatings to fully reach the international advanced level, and successfully made domestic automotive coatings into the spare parts market, attracting Henkel, the United States, and BEHR. United States GE, British Empire Chemicals and other international well-known companies have come to find out. This technology won the second prize of the 2009 National Technology Invention Award.