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Compatibility and Anti Stickiness of Organosilicon

Jun 20, 2024

The main chain of organic silicon is very flexible, and this excellent flexibility is due to the basic geometric molecular structure. Due to the much weaker intermolecular forces between its molecules compared to similar compounds, it has lower viscosity, weaker surface tension, lower surface energy, stronger film-forming ability, and excellent anti adhesion and demolding properties. It can be used as a high-temperature resistant and durable demolding agent. This low surface tension and low surface energy are the main reasons for its various applications: hydrophobic, defoaming, foam stability, anti sticking, lubrication, polishing and other excellent properties. Silicone resin has poor compatibility with other organic materials and is difficult to mix with other organic resins.

Mechanical properties of organic silicone resin
Due to the small molecular structure and intermolecular forces of organic silicon polymers, the effective crosslinking density is low, so the mechanical strength (bending, stretching, impact resistance, abrasion resistance, etc.) of silicone resins is generally weak. However, as a type of electrical insulation paint, coating, and adhesive, silicone resin requires mechanical properties that focus on hardness, flexibility, thermoplastic properties, and adhesive properties. The hardness and flexibility of silicone resin films can be adjusted over a wide range to meet usage requirements by changing the resin structure. By increasing the crosslinking degree of silicone resin (increasing the content of three or four functional links), a high hardness and low elasticity paint film can be obtained. That is, as the crosslinking density increases, a high hardness and low elasticity paint film can be obtained; On the contrary, reducing the degree of crosslinking can result in a flexible film. Introducing substituents that occupy a larger space on silicon atoms can also produce a softer and more elastic paint film. Therefore, in the case of similar structures, the flexibility and thermoplastic properties of methylphenyl silicone resin are superior to those of methylsilicone resin.

The introduction of benzene into silicone resin chains can improve their heat resistance, elasticity, and pigment compatibility, as well as improve their compatibility with organic resins and their adhesion to various substrates. Silicone resins containing phenyl groups have high thermoplastic properties, so silicone resins do not require the use of special plasticizers. By adjusting the appropriate ratio of phenyl and methyl groups in the resin, the required hardness and other properties can be obtained.
Introducing chlorophenyl groups into the main chain of organic silicone resin macromolecules can improve mechanical strength, as the introduction of halogens increases the polarity of the macromolecular chains and enhances intermolecular attraction. The main drawback of fiberglass made from general silicone resin is its low interlayer shear strength. If the phenyl group in the molecular chain of the silicone resin is replaced by chlorinated phenyl group, the static bending strength of the laminated product made from it is significantly improved.

The main drawback of glass fiber laminates made of general silicone resin is poor bonding strength between layers and a significant decrease in bending strength when heated. If phenylene is introduced into the main chain of silicon oxide, it can improve rigidity and strength, thereby increasing the usage temperature. The glass fiber laminated board made of this resin can withstand a long-term temperature of 350 ° C and a short-term temperature of up to 480 ° C. At room temperature, the tensile strength reaches about 300MPa, and it has excellent electrical properties at high temperatures. It can be used as an ultra-high frequency insulation material for long-term use at 350 ° C.

When pure silicone resin is used as certain coatings, its surface hardness is too low, its thermoplastic properties are too high, and its adhesion is insufficient. Compare the surface hardness and elasticity of some organic resins and organosilicon resins. Organic modified silicone resin has a good effect in improving mechanical properties, and its mechanical properties are better than pure silicone resin, which can overcome these shortcomings.

Pigments and catalysts can also affect the hardness and elasticity of silicone resins. Pigments have the effect of accelerating the oxidation of silicone resin paint films and converting them into harder silicone glass. Using low activity catalysts, due to incomplete combination reactions, only soft coatings can be obtained; On the contrary, using highly active catalysts (such as compounds such as Pb and Al) can obtain hard and brittle coatings, but some catalysts (such as seat esters) can effectively improve the hardness of coatings without significantly reducing elasticity.

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