有机硅涂料（silicone coating）
Rearch progress of organosilicon coatings
Silicone is the first widely ud elements of the organic polymer compound, has excellent performances due to its unique chemical structure, widely ud in various fields of national economy, but also plays an important role in the paint industry. Silicone coatings are organosilicon polymer and silicone modified polymer as main film coating material, it has excellent heat resistance, electrical insulation, corona resistance, radiation resistance, moisture resistance and weather resistance, stain resistance, monk water and chemical corrosion resistance and other properties, in recent years in the improvement and application performance of the products have been the rapid development of.
1 silicone resin coating made of organic silicon resin film material, mainly heat-resistant, weather resistant silicone anti-corrosion coating, scratch resistant transparent silicone coating, relea and moisture-proof coatings and radiation resistant coatings and other varieties.
Coating with silicone resin with three methyl chlorosilane (CH3 SiCl3), two methyl two chloro silane [(CH3) 2SiCl2], three (C6H5SiCL3) phenyl chlorosilane, two phenyl chlorosilane two [(C6H5) 2SiCl2] and methyl phenyl chlorosilane CHO two (C6H5) SiCl2 as raw materials for hydrolysis polycondensatio
爱一个人的网名n prepared. The effect of monomer structure, number and proportion of functional groups on properties of coatings is very important. The types of organic groups connected on silicon atoms also affect the properties of resins. Different
organic groups can make organosilicon resins exhibit different properties. For example, when the organic group is methyl silicone resin, with thermal stability, releasability, hydrophobicity and arc resistance; for phenyl, given the oxidation stability of silicone resin, crystalline polymer can be destroyed in a certain range;
As the vinyl group, the curing property of organosilicon resin can be improved, and coupling property is brought into being; when phenyl ethyl is ud, the compatibility of organosilicon resin and organic substance can be improved. The ba can be introduced in the siloxane backbone, increa its compatibility with alkyd resin and polyester resin; introducing phenylene and two phenyl ether subunit, biphenyl subunit of aromatic subunit and silicon carbon boron polymers, radiation resistance, the temperature can reach 300 to 500 DEG C; the backbone structure for the Si-N bond is silicone polymer, its thermal stability at 400 deg. In practical application, different organosilicon monomers can be lected according to the requirements, and different organic groups are induced in the organosilicon resin.
Chenguang Rearch Institute of chemical industry with a viscosity of 20 ~ s, 40mPa - hydroxy silicone oil (CH3) and 2SiCl2 methyl triethoxysilane as raw material, control of nR / NSI is 1.3 ~ 1.4, the quality of 2SiCl2 (CH3) and hydroxyl silicone oil ratio was 7O:3O, and the drop of water way at the temperature of 50 1H hydrolysis. Get the methyl silicone resin has good hardness and elasticity, can be ud for flame retardant coatings were prepared by metal film resistors. Chine Academy of sciences so CH3SiCl3 as the main raw material,上海寒假
acetone and xylene as the solvent, soluble trapezoid with narrow molar mass distribution of poly methyl silicone resin was synthesized by the high temperature coating resin with a certain amount of aluminum powder, RTV silicone rubber prepared by 250 DEG C, old 1000 h, its flexibility, oil resistance and resistance have good corrosion resistance. HeFei University of Technology siloxane silicate four functional groups with three functional groups, through strict control of total hydrolysis reaction, the ba material is prepared with silicate and silicone polymer properties, the binder and filler and other auxiliary materials according to a certain proportion of organic silicon heat-resisting coating made of.
有帮助的英文2 modified silicone resin coating while the silicone resin has many excellent properties, but also has some problems: the general need for high temperature (150 ~ 200 DEG C) curing, curing time, the c
onstruction of large area is not convenient; adhesion to the substrate, organic solvent resistance, high temperature mechanical strength of the film is not good, the price more expensive etc.. In order to overcome the shortcomings, organic silicone resin was ud to modify the organic resin. Modified silicone resin usually has the advantages of two resins, which can make up for some deficiencies in the performance of the two resins, thereby improving performance and expanding application fields. There are two kinds of modification methods, physical mixing and chemical modification. The effect of chemical modification is better than that of physical blending. Chemical modification is mainly on the end or side chain of polysiloxane chain, and then react with other polymers to produce block, graft or interpenetrating polymer networks, thus obtaining new
properties. In the coatings industry, silicone modified organic resins are mainly alkyd resins. Acrylic resin, epoxy resin, etc..
2.1 silicone modified alkyd resin coating古代名
Silicone modified alkyd resin coatings is not only an alkyd resin paint film curing at room temperature and physical and mechanical properties, and has the advantages of good heat resistant silicone resin, UV aging resistance and good water resistance characteristics, coating is an excellent compre
hensive performance. The first modification was to add the silicone resin directly to the alkyd reaction kettle that reached the end point,闲梦江南梅熟日
The weatherability of alkyd resin is improved greatly. Another modification is to prepare reactive organosilicon oligomers to react with free hydroxyl groups on alkyd resins, and also to u organosilicon oligomers as polyols and alkyd resins for polycondensation. The alkyd resin modified by chemical reaction has better weatherability. Hunan University prepared by alcoholysis hydroxyl alkyd prepolymer and end to hydrolysis or different functional silicone prepolymer prepared by polycondensation reaction synthesis (A B) silicone alkyd type n block copolymer, and the copolymer as ba material made of varnish; comprehensive performance of the varnish excellent, not only has the alkyd resin varnish film flexibility, room temperature curing, impact strength and advantages of good adhesion, but also greatly improve the heat resistance, ageing resistance and anti corrosion properties of water medium.
2.2 silicone modified acrylic resin coating
杨建丽Silicone modified acrylic resin coating has excellent weatherability. It has the advantages of light retention, color retention, easy powdering and good gloss. It is widely ud for pre coating of metal s
无人机实名登记系统heets, painting of machine equipment and weatherproof decoration and decoration of interior and exterior walls of buildings. Silicone modified acrylic resin has two types, solvent and emulsion, of which silicone acrylic latex coating has excellent weatherability, stain resistance, chemical resistance, is an environmentally friendly green paint. Hubei University us a water-soluble radical initiator, with hydrogen containing silicone oil and butyl acrylate as raw material, the excellent performance of silicone / acrylic emulsion was synthesized by emulsion polymerization method; the emulsion has good acid and alkali. High and low temperature resistance and electrolyte stability, the coatings prepared with it have good weatherability and stain resistance. Ji'nan Chemical Rearch of acrylate monomer and D4 and vinyl ven methyl siloxane ring four as raw material, by adding a certain amount of grafting agent, using a batch of polyacrylate stable synthesis of polysiloxane emulsion. Sichuan Province Building Materials Industry Rearch Institute by pre emulsification process, the activity of silicone and acrylate monomer by emulsion copolymerization by organosilicon modified acrylic emulsion coating prepared with the emulsion of stain resistance, excellent comprehensive performance.
Fudan University with vinyl silicone monomer and acrylate, methyl acrylate and acrylic acid hydroxy ester monomer polymerization by ed emulsion was stable with excellent
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