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Analysis of coupling mechanism and research status of silane coupling agent
Author:LongKom  Time:2013-10-9

In 1947, Ralph KW et al. found that polyester composites made by treating glass fibers with allyltriethoxysilane could obtain double strength, thus opening up the history of practical application of silane coupling agents, which greatly stimulated the research and development of silane coupling agents. From the 1950s to the 1960s, amino and modified amino silanes appeared successively. Thermostable silanes, cationic silanes, diazo and azide silanes, and alpha-functional group silanes were developed. With the advent of a series of new silane coupling agents, especially their unique properties and remarkable modification effects, their application fields have been expanding and their output has been greatly increased. According to the report in August 2001, the annual output of silane coupling agents in China has reached about 10,000 tons, which can compete with the United States and Germany. Silane coupling agent is the fourth major category after silicone oil, silicone rubber and silicone resin, which are the three main products in the silicone industry. Its position in the silicone industry is becoming more and more important. It has become an indispensable chemical assistant in modern silicone industry, organic polymer industry, composite material industry and related high-tech fields. It is also an important high-tech content. Value-added organosilicon products.
Structural Characteristics and Mechanism of Silane Coupling Agent


YR is a non-hydrolytic organic group, Y includes alkenyl groups (mainly Vi) and alkyl groups with Cl, NH2, SH, N3, OCOMe, CH=CH2, NCO functional groups at the end; X is a group for hydrolysis reaction and formation of Si-OH, including Cl, OMe, OEt, OC2H4OCH3, OSiMe and OAc (the most common is Cl, OMe, OEt, OC2H4OCH3, OSiMe and OAc). OMe, OEt, can react with inorganic materials or adsorb on the surface of materials, thus improving the affinity with inorganic materials. X and Y are two kinds of active groups with different reaction characteristics. X is easy to bond with inorganic substances or minerals such as glass, silica, clay, talc, titanium dioxide and some metals such as aluminium, titanium, silicon, iron, copper and zinc. Y is easy to combine with resin, rubber and other products in organic matter. It is precisely because there are two kinds of functional groups in silane coupling agent molecule, organic and inorganic, that can connect two kinds of materials with different chemical structure types and affinity at the interface, increase the combination of coatings and inorganic bottom and pigments, fillers and resin base.


1. Coupling mechanism and research status of silane coupling agents


Silane coupling agent was first developed by United Carbide Corporation (UCC) and Dow Corning Corporation (DCC) in the 1940s for the development of glass fiber reinforced plastics. It was initially used in glass fiber reinforced plastics as a surface treatment agent for glass fibers. In 1947, Ralph KW et al. found that polyester composites made by treating glass fibers with allyltriethoxysilane could obtain double strength, which initiated the history of practical application of silane coupling agents and greatly stimulated the research and development of silane coupling agents. From the 1950s to the 1960s, amino and modified amino silanes appeared successively. Thermostable silanes, cationic silanes, diazo and azide silanes, and alpha-functional group silanes were developed. With the advent of a series of new silane coupling agents, especially their unique properties and remarkable modification effect, their application fields have been expanding and their output has increased greatly. According to the report in August 2001, the annual output of silane coupling agents in China has reached about 10,000 tons, which can compete with the United States and Germany. Silane coupling agent is the fourth major category after silicone oil, silicone rubber and silicone resin, which are the three main products in the silicone industry. Its position in the silicone industry is becoming more and more important. It has become an indispensable chemical assistant in modern silicone industry, organic polymer industry, composite material industry and related high-tech fields. It is also an important high-tech content, high attachment. Value added organosilicon products.


2. Structural characteristics and mechanism of silane coupling agent


Structural characteristics of silane coupling agents Silane coupling agents are silanes containing two different chemical groups (organic functional group and hydrolyzable group) in a class of molecules. Their classical products can be expressed by the general formula (YR) nSiX4-n (n=1,2). YR is a non-hydrolytic organic group, Y includes alkenyl groups (mainly Vi) and alkyl groups with Cl, NH2, SH, N3, OCOMe, CH=CH2, NCO functional groups at the end; X is a group for hydrolysis reaction and formation of Si-OH, including Cl, OMe, OEt, OC2H4OCH3, OSiMe and OAc (the most common is Cl, OMe, OEt, OC2H4OCH3, OSiMe and OAc). OMe, OEt, can react with inorganic materials or adsorb on the surface of materials, thus improving the affinity with inorganic materials. X and Y are two kinds of active groups with different reaction characteristics. X is easy to bond with inorganic substances or minerals such as glass, silica, clay, talc, titanium dioxide and some metals such as aluminium, titanium, silicon, iron, copper and zinc. Y is easy to combine with resin, rubber and other products in organic matter. It is precisely because of the existence of two functional groups, organic and inorganic, in the middle of silane coupling agent molecules that two different kinds of chemical structures can be classified.

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