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    The development history of the elastic coating
    Time:2014-02-06 Click:
     

    Elastic paint was originally developed and developed from the beginning of the western developed countries. In Europe, the earliest start of elastic coating is Bryn-aetai. He declared USA patent in 1964. Eleven two years later, someone is a challenge to the first patent, in 1975 and 1977 declared its kind but the improved performance of the patent. In 1982, Italy Settef company S.P.A. Teviso declared USA latest patent due to elastic exterior wall paint has high elasticity, so when the cracks of wall, the film was tensile deformation without cracking, coating still intact to maintain original vibration effect of various resistance, prevent the wall cracking directly exposed to the atmosphere. While the elastic film with a variety of material (water and other liquid) barrier, prevent invasion of all kinds of corrosive substances to the internal wall, so as to effectively protect the walls from harm, give full play to its protective function.

    In Japan, elastic coating arguments appeared in the twentieth Century at the beginning of the 80's literature, such as Showa 547439, Showa 54138025 patent. Japan "paint research" magazine published elastomeric building latex paint and acrylic resin type elastic exterior paints in early 1982. According to at that time Japan other relevant literature reports, elastic coating can be composed of acrylate emulsion and internal plasticization of polyvinyl acetate emulsion blends as the base material, pigment, with aggregate and auxiliaries. Acrylate emulsion can be the number of carbon atoms in the alkyl 85%-90% is alkyl acrylate 3-10, 0.5%-10% of the acrylic or methacrylic acid and possibly other copolymerization of vinyl monomers. Vinyl acetate is the glass transition temperature of emulsion of vinyl acetate in plasticized than ~ like homopolymer low. As the plasticity of ethylene, propylene monomer can be used, ethyl acrylate, acrylic acid, butyl acrylate, acrylic 2 ethylhexyl, carbonic acid ethylene, maleic acid butyl ester two etc.. The above two kinds of emulsion is a mixture of elastic, adding to the pigment, aggregate and pigment, film-forming additive, monolayer coating made of mainly used for waterproof and wall decoration. By using the brush coating, roll coating and spraying method for coating construction, can also be a variety with different decorative effects, such as having a concavo convex texture of the complex layer of coating film, napping decorative coating.

    According to the Japanese Water Valley coatings company, East Asian Synthetic Chemical Corporation, SKK Corporation reported that began in Japan in recent years a large number of production is the application of multilayer elastic coating. Generally divided into three layers: the first layer is the second layer of primer, as the main material, the third layer is the top coat. The first two layers of the base material is waterborne acrylate elastic resin, third layers of solvent type polyurethane topcoat. The main characteristics of such supporting composite coating are: the elastic change of wall cracks had good adaptability, can prevent the infiltration of rainwater; the base of a variety of materials has strong adhesion, water resistance, alkali resistance is good; the weather is good, that is resistant to atmospheric corrosion resistance to the good pollution; the construction is simple, easy to master. Because of these advantages, the Japanese high-rise buildings generally tend to use elastic coating.

    Development and application of elastic coating in our country from the beginning of twentieth Century, the beginning of the 90's. E if by elastic polyurethane as binder, using coal tar as filler 'and called "Application of 851 polyurethane waterproof coating" name of the goods; the main function as architectural coatings (waterproof coating) used in building roofing, basement exterior wall, kitchen, bathrooms ground and some special parts of the structure of the waterproof and to a large number of applications. This type of paint is generally two components, the first component is a pre blocked isocyanate prepolymer component B is 3,3, two chloro -4,4 one or two amino two phenyl methane (commercial name for Mocha, MOCA) curing group as the main component of the branch.

    As the elastic coating functional decorative paint walls, its application and development is from the end of twentieth Century began, and promote the development of application to import foreign products in the domestic engineering application for the beginning. At home in recent years relevant professional journals have been reported. These coatings are more elastic polyacrylate emulsion, styrene acrylate emulsion as base material and adding a variety of synthetic resin emulsion paint commonly used additives, pigments and fillers prepared. The initial stage of development is to flat paint. In recent years, high decorative elastic coating varieties, such as elastic multi layer coating, elastic rough coatings such as increased. At present, the application technology of elastic coating has been basically mature, and is committed to solve some problems in the performance of the coating on the aspect of application problems. For example, the application of a new emulsion polymerization technologies (e.g., soap free polymerization, core-shell polymerization etc.) to get the new emulsion, with self crosslinking properties of emulsion to overcome poor film pollution resistant performance problems.

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