有机硅涂料silicone coating.docx

1、有机硅涂料silicone coating有机硅涂料（silicone coating）Research progress of organosilicon coatingsSilicone is the first widely used elements of the organic polymer compound, has excellent performances due to its unique chemical structure, widely used in various fields of national economy, but also plays an imp

2、ortant 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,

3、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

4、 anti-corrosion coating, scratch resistant transparent silicone coating, release 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) pheny

5、l chlorosilane, two phenyl chlorosilane two (C6H5) 2SiCl2 and methyl phenyl chlorosilane CHO two (C6H5) SiCl2 as raw materials for hydrolysis polycondensation prepared. The effect of monomer structure, number and proportion of functional groups on properties of coatings is very important. The types

6、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 resistan

7、ce; 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 used, the compatibility of organo

8、silicon resin and organic substance can be improved. The base can be introduced in the siloxane backbone, increase 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, radia

9、tion 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 selected according to the requirements, and different organic groups are indu

10、ced in the organosilicon resin.Chenguang Research 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

11、the drop of water way at the temperature of 50 1H hydrolysis. Get the methyl silicone resin has good hardness and elasticity, can be used for flame retardant coatings were prepared by metal film resistors. Chinese Academy of sciences so CH3SiCl3 as the main raw material, acetone and xylene as the so

12、lvent, 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 c

13、orrosion resistance. HeFei University of Technology siloxane silicate four functional groups with three functional groups, through strict control of total hydrolysis reaction, the base material is prepared with silicate and silicone polymer properties, the binder and filler and other auxiliary mater

14、ials according to a certain proportion of organic silicon heat-resisting coating made of.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 construction o

15、f 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 these shortcomings, organic silicone resin was used to modify the organic resin. Modified silicone r

16、esin 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

17、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 mo

18、dified organic resins are mainly alkyd resins. Acrylic resin, epoxy resin, etc.2.1 silicone modified alkyd resin coatingSilicone 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

19、resistant silicone resin, UV aging resistance and good water resistance characteristics, coating is an excellent comprehensive performance. The first modification was to add the silicone resin directly to the alkyd reaction kettle that reached the end point,The weatherability of alkyd resin is impro

20、ved greatly. Another modification is to prepare reactive organosilicon oligomers to react with free hydroxyl groups on alkyd resins, and also to use organosilicon oligomers as polyols and alkyd resins for polycondensation. The alkyd resin modified by chemical reaction has better weatherability. Huna

21、n 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 base material made of varnish; comprehensive performance

22、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

23、 coatingSilicone modified acrylic resin coating has excellent weatherability. It has the advantages of light retention, color retention, easy powdering and good gloss. It is widely used for pre coating of metal sheets, painting of machine equipment and weatherproof decoration and decoration of inter

24、ior 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 uses a water-soluble rad

25、ical 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,

26、the coatings prepared with it have good weatherability and stain resistance. Jinan Chemical Research of acrylate monomer and D4 and vinyl seven methyl siloxane ring four as raw material, by adding a certain amount of grafting agent, using a batch of polyacrylate stable synthesis of polysiloxane emul

27、sion. Sichuan Province Building Materials Industry Research 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 p

28、erformance.Fudan University with vinyl silicone monomer and acrylate, methyl acrylate and acrylic acid hydroxy ester monomer polymerization by seed emulsion was stable with excellent properties of silicone modified acrylate emulsion. Acrylic silicone resin was modified by organosilicon monomer in Zh

29、ejiang University, and silicone acrylic emulsion coating was prepared. Polysiloxane polyacrylate interpenetrating network coating synthesis of Chongqing University, the coating is colorless and transparent, high hardness, strong adhesion, acid deposition, heat aging and has good permeability, can be

30、 used as anti weathering materials of rock friction moment.HH silicone acrylic resin developed by Shanghai Academy of building research is suitable for the preparation of weather resistant coatings with high weatherability for more than 15 years. HeFei University of Technology with TEOS hydrolysis c

31、ondensation part to polysiloxane with hydroxyl acrylic resin was prepared by organic silicone modified acrylic resin; the resin in acid and alkali resistance, salt resistance, solvent resistance and impact strength has significantly improved compared with that of pure polysiloxane, and high temperat

32、ure resistance is obviously improved acrylic resin. Jiangsu architectural materials research and Design Institute introduced a certain amount of organosilicon functional group in the synthesis of acrylic resin, and prepared the solvent modified silicone resin coating with high weatherability. The Ch

33、inese Academy of Sciences of Lanzhou Institute of Chemical Physics with hydroxyl terminated poly two methyl siloxane, in two under the action of azo isobutyronitrile, and methacrylic acid (ester) monomers by solution copolymerization, silicon rubber modified acrylic resin, the resin has good heat resistance.2.3 silicone modified epoxy resin coatingThe