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History of application of silicone coupling agents

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As a synthetic material additive, silicone coupling agent can become an annual output of tens of thousands of tons of industry, thanks to the expansion of application fields and the increase of market demand.
The development of application field lies in the chemical molecules of organic silicon coupling agent, which have carbon and silicon functional groups with different chemical reactivity. The increase of the market is due to the improvement of the synthesis method to reduce its production cost, its cost-effective recognition by users.
Silicone coupling agent is first in order to make glass fiber reinforced resin matrix composites (FRP) products performance improvement, in order to adapt to the application needs to develop a new class of organic silicon with carbon functional groups.
The relative density of glass fiber reinforced resin matrix composites is only 1.2~2.0, which is only 1/6~1/4 of ordinary steel and about 1/3 lighter than aluminum, but its mechanical strength is up to or above the level of ordinary steel or some special alloy steel.

Therefore, during the Second World War, this kind of light weight, high strength materials naturally attracted the attention of the military sector, and soon used in aircraft radome, drop tank, aircraft wings and a lot of military supplies manufacturing; The first fiberglass fishing boat was also launched in 1942, marking the beginning of the transition from military to civilian use.
FRP this kind of material, when modified with silane coupling agent is added in addition to the higher than strength, also have good fatigue resistance, good vibration damping, broken good safety, good weather resistance, chemical corrosion resistance, good electric properties, low thermal conductivity, and features of small linear expansion coefficient, it can also be made transparent, all kinds of color products, its processing performance is very good also.

Therefore, after the Second World War, this material was quickly promoted by military to transportation, construction, chemical industry and many other civilian fields as structural materials.
With the development of polymer industry, in order to improve the plastic, rubber, coating, adhesive, sealant, such as physical and chemical properties, polymer materials products production to reduce costs, as the enhancement, compatibilizing packing of SiO2 or clay mineral powder, the application of inorganic materials such as more and more organic silicon coupling agent as the treatment of inorganic materials is becoming more and more widely used, It has been widely accepted that they can modify or reduce the production cost of various organic polymer composites.

The application of silicone coupling agent in polymer chemical structure modification is one of the fastest developing fields in recent 40 years. With organic polymer modified by grafting, block or macromolecular monomer of in-depth study, superior performance and comprehensive performance of organic polymer compound, organic silicon modified organic polymer or organic modified polysiloxane research and development, as well as the preparation of different chemical structure of polymer composite polymer alloy, or polymer/metal composite materials manufacturing, Silicone coupling agent as these materials crosslinking, chain extension, grafting monomer or stickiness, strengthening agent is more and more popular, in the future in this field will continue to expand the use.

Since the 1980s, the research and development of functional organic materials or functional organic/inorganic hybrid materials has become the favorite field of many researchers, and the importance of this field to the current scientific and technological progress has been widely recognized.

Organic silicon compound with coupling effect, for the synthesis of functional group monomer, or as a fixed anchor materials on inorganic carrier, has been used by the researchers, its are involved in the research and development of immobilized homogeneous coordinate, immobilized enzyme, solid phase synthesis materials, optoelectronic materials, separating materials, photochromic materials, light crosslinking material, liquid crystal orientation, etc.

In the early stage of the development of silicone coupling agent, the synthesis of ammonia-hydrocarbyl and thiol-hydrocarbyl compounds is mainly used for material protection coating, which has been widely used in this field. The improvement of its application method makes its effect better and better, and new compounds are also being developed constantly. Material protection experts hope that they can replace phosphating or chroming in metal material protection, in order to reduce environmental pollution.

In the 21st century, silanization technology is not only used for the surface treatment of metal materials to replace chromization and phosphating anti-corrosion measures, but also the application of silicone coupling agent and its derivatives in material protection and surface engineering technology has formed its unique application research direction. The research and development field is not only involved in the silanization of metal surface, There are also brick, ceramic, soil, wood, cement and other material components, devices, architecture and cultural relics and other related protection.

The application technologies mentioned above include surface modification, thin film deposition, coating preparation and surface infiltration reinforcement. Research and development in this area improves protection reliability, safety and durability, and extends the service life of materials, thus achieving the purpose of long-term protection of these aspects of application performance.

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