The Development Of Organosiloxane And Its Application In The Anticorrosion Coatings

Organosilicon compounds are currently a class of organic compounds with a wide Study,which the species number already amounted to thousands, the annual output of hundreds ofthousands ton, the annual production value reach to billions of yuan, it has become one ofthe rapiddest development materials in the chemical industry, It is also a wide range ofapplications, which related to aerospace, construction, machinery, textile, medical,transportation and many other industries.Organosiloxane is a kind of organic sillicon compound, the silane coupling agent is thelow molecular weight organo-siloxane, The organic sillicon compound molecules containstwo different properties of functional group, which can play the role of coupling connect twodifferent material together tightly. Besides this coupling effect, it also can be used as rawmaterial to prepare the thousands of silicone products such as silicone oil, silicone rubber andsilicone resin. The synthesis of organic silane coupling agent is mainly throughSilicon-hydrogen addition reaction to add carbon chain in the silicon atom. At present thecommonly used method is the traditional Speier’s catalyst(H2PtC16·6H2O), but if separateusing chloroplatinic acid as catalyst, there will be Low catalytic efficiency and moreby-product. The silane coupling agent is widely range of applications, such as compositematerial, enhancement of the mechanical properties of materials and can be modified; and italso can applied to coating material and adhesive industry, improved performance of theproduct to make it better used. No matter how broad application, the main reason from thecoupling agent structure considerations, among them the most important is the coupling agentcan enhance the adhesion of product and substrate.This study mainly use chloroplatinic acid modified coordination catalyst carried outSilicon-hydrogen addition reaction, and get different structures of amino silanes, and find theinfluence of the amino silane coupling agent on performance of coating material.The main results are as follows:1. Using methyldichlorosilane, chloropropene, methanol and ethanediamine as rawmaterial, through three step reactions to obtain the final product(N-(β-aminoethyl)-γ-ammonia propyl methyl dimethyl oxygen) silicane. The first step is composed of methyl dichlorosilane and allyl chloride by hydrosilylation get gamma-methyl dichlorosilane, Weselected triethylamine and chloroplatinic acid complexes as catalyst; the second step, use theintermediates and methanol for alcoholysis reaction, hydrogen chloride produced by thealcoholysis reaction removal from reaction system with nitrogen; finally we get the finalproduct-double amino silane coupling agent by ammoniation reaction, The experimentalconditions were optimized by orthogonal experiment, and the termination product wascharacterization by IR and NMR.2. Using methyl dichlorosilane, allyl amine, hexamethyldisilazane and methanol as rawmaterial, through three step reactions to obtain the final product single amino silane couplingagent(γ-aminopropyl methyl two methoxy silane). The first step is amino protection, themethod is that using hexamethyldisilazane as protective agent to protect the amino-group onallyl amine, then let the intermediates we get in the last step and methyl dichlorosilane forSilicon-hydrogen addition reaction, finally, we got the final product by the intermediates weget in the last step and methanol for alcoholysis reaction which can removal of protection ofamino-group the previously mentioned, the termination product was characterization by IRand NMR.3. we research on the formulation of coating material, and two kinds of silane couplingagent with different structures we synthesized are applied to the coating material to study theeffect on the properties of the coating, the most obvious is that can enhance the adhesionbetween the coating and the substrate, the effect of double amino type t is better than singleamino type.