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Types and Applications of Silane Coupling Agents

Nov 19, 2020

The application of silane coupling agent can be roughly summarized into three aspects;
(1) Used for surface treatment of glass fiber. Silane coupling agent can improve the bonding performance of glass fiber and resin, and improve the strength, water resistance and weather resistance of glass fiber reinforced composite materials. In 2004, the silane coupling agent used in glass fiber accounted for more than 50% of its total consumption. Among them, vinyl silane, amino silane, methacryloxy silane, etc. were more used.
(2) Used for surface treatment of inorganic fillers. The silane coupling agent can pre-treat the surface of the filler when coupling the inorganic filler and resin, or directly add it to the resin. In order to improve the dispersibility and adhesion of the filler in the resin, improve the process performance and fill the plastic ( (Including rubber) mechanical, electrical and weather resistance performance.
(3) Used as a sealant, adhesive and paint thickener. Silane coupling agents can improve their bonding strength, water resistance, weather resistance and other properties. Silane coupling agents can often solve the problem that some materials cannot be bonded for a long time.

Varieties of silane coupling agent:
There are many varieties of silane coupling agents (see the table below for commonly used silane coupling agents), among which the largest output is bis-[3-(triethoxy)silylpropyl]tetrasulfide, which is composed of trichlorosilane, Propylene chloride is used as the raw material to catalyze the synthesis of γ-chloropropyltrichlorosilane (it is an intermediate product for the production of various silane coupling agents), and then undergo alcoholysis to obtain γ-chloropropyltriethoxysilane, which is then combined with sulfide Manufactured by reaction under certain conditions. It is a multifunctional silane coupling agent successfully used in the rubber industry and is widely used in radial tires and other rubber products.

Brief description of the process flow: a certain amount of purified trichlorosilane (98%) and chloropropylene (99%) are injected into the mixing kettle and mixed thoroughly, and then mixed with a batch of platinum compound in isopropanol solution under nitrogen protection Into the addition kettle with a vacuum of 0.03-0.04Mpa and flushed with nitrogen, heat it in an oil bath, control the temperature at 50-60℃, and fully react for 5-6 hours. The catalyst is added in batches during the reaction. After the addition, the reaction solution was gradually heated to 80°C and refluxed. When the reflux solution gradually decreased until no reflux solution was seen, the reaction was terminated, and the reaction solution was pumped into the fractionator for fractionation. The pressure in the kettle was 0.04Mpa and the temperature The temperature is controlled at 160°C, the low boiling substances are removed, and the crude product is further rectified to obtain the γ-chloropropyltrichlorosilane product.

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