What is high performance silicone resin? What are the characteristics and application analysis of silicone resin, and then share the analysis of high-performance silicone resin R&D and market application prospects.
Polymer Structure Characteristics, Properties and Applications of Silicone Resin
The silicone resin is a semi-inorganic semi-organic type polymer having -Si-O as a main chain and an organic group in a side chain. The silicone resin is a bulk polymer having a plurality of reactive groups, and the reactive groups are further cross-linked, that is, converted into insoluble and infusible three-dimensional structure cured products.
Silicone resin has excellent performances such as high and low temperature resistance, weathering resistance, moisture resistance, high dielectric strength, low dielectric loss, arc resistance and radiation resistance.
General purpose solution silicone resins are mainly used as base polymers for heat resistant coatings, weathering coatings and high temperature resistant electrical insulating materials.
1.2 Technological Evolution of Silicone Resins
Among all kinds of silicone polymers, silicone resin is one of the earliest synthetic and applied silicone products. Compared with the rapid development of silicone rubber pattern refurbishment technology, the technological improvement of silicone resin is relatively slow, and major technological breakthroughs are less. . Beginning about twenty years ago, due to technological advances in aromatic heterocyclic high temperature resistant polymers, some of the applications that originally belonged to silicones were squeezed, but the solvent toxicity and harsh curing conditions of aromatic heterocyclic heat-resistant polymers Limiting the application of expansion, in recent years, people have begun to pay attention to the research and development of silicone resin. Silicone resin has outstanding advantages such as wide temperature range, aging resistance and hydrophobic moisture resistance. There are indications that silicone resin may have a larger future. Development space.
2. General purpose silicone resin
2.1 General-purpose silicone resin production process
Different types of silicone resins have different raw materials and synthetic routes. Here, only a few types of silicones are briefly introduced to their production processes.
2.1.1 methyl silicone resin
126.96.36.199 Synthesis of methyl silicone resin from methyl chlorosilane
The methyl silicone resin is synthesized by using methylchlorosilane as a main raw material. Since the structure and composition of the silicone resin are different (the degree of crosslinking of the silicone resin, that is, the [CH3]/[Si] value), different synthesis conditions are required.
When the low R/Si([CH3]/[Si]≈1.0) methyl silicone resin is synthesized, the hydrolysis and condensation reaction rate of the main raw material monomer methyltrichlorosilane is quite fast, and the reaction temperature must be strictly controlled to not exceed 0 °C. It is also necessary to carry out the reaction in a complex solvent, and the reaction product is stored for only several days at room temperature. The practical value of such products is not great.
Methyl chlorosilane is used to synthesize methyl silicone resin with larger R/Si. Although the hydrolysis condensation reaction of methyltrichlorosilane and dimethyldichlorosilane is slightly slower than the hydrolysis condensation reaction with methyltrichlorosilane. However, the hydrolytic condensation reaction speed difference between methyltrichlorosilane and dimethyldichlorosilane is too large, and the mixed hydrolyzate and the raw material monomer do not match each other because of the premature hydrolysis and condensation of methyltrichlorosilane. And methyl trichlorosilane is often subjected to advanced hydrolysis condensation to form a partially crosslinked gel, and the resulting methyl silicone resin has poor overall performance.
188.8.131.52 Synthesis of methyl silicone resin from methyl alkoxysilane
The hydrolysis condensation reaction rate of the methyl alkoxysilane can be controlled by changing the reaction conditions, and a methyl silicone resin having a different degree of crosslinking can be synthesized from the methyl alkoxysilane.
The commercial methyl silicone resin with medium cross-linking degree ([CH3]/[Si]≈1.2-1.5) is mostly obtained by hydrolysis condensation reaction of methyl alkoxysilane: methyl triethoxy group refined by acid removal. Mix silane and dimethyldiethoxysilane monomer with water, add trace amount of hydrochloric acid or appropriate amount of strong acid type cation exchange resin (large pore strong acid type ion exchange resin has better catalytic effect), activated clay (drying after acidification) As a catalyst, heating, and carrying out a hydrolysis reaction, when the end point is reached, an appropriate amount of hexamethyldisilazane is added to neutralize the catalyst hydrochloric acid, or an ion exchange resin or activated clay as a catalyst is filtered to terminate the condensation reaction. The product obtained was an alcohol solution of methyl silicone resin.
Contact：Sharon Song(Sales manager)
Zhejiang Runhe Organosilicone New Material Co.,Ltd(Factory)
Zhejiang Runhe Chemical New Material Co.,Ltd(Exporter)
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