Coupling agent is a kind of substance with an amphoteric structure. Part of the groups in their molecules can react with chemical groups on the inorganic surface to form chemical bonds; the other part of the groups has the properties of organophiles and can chemically interact with organic molecules. It reacts or produces strong intermolecular interactions, thereby firmly combining two materials with completely different properties, improving the dispersion of inorganic fillers in the polymer matrix, and improving the mechanical properties and use performance of the filled polymer materials.

The selection principle of coupling agent

1. Silane coupling agents are mainly suitable for glass fiber and silicon-containing fillers, such as quartz, wollastonite, etc., and can also be used for some metal oxides and hydroxides, but not for CaCO3. The resin is mainly thermosetting resin.

2. Titanate coupling agents have a wide range of applications to fillers, such as CaCO3, titanium dioxide, etc., and can also be used in glass fibers. The resin is mainly a thermoplastic resin.

3. Acidic fillers should use coupling agents containing basic functional groups, while basic fillers should use coupling agents containing acidic functional groups.

4. The amount of coupling agent added. The amount of silane coupling agent can be about 1% of the filler; the amount of titanic acid is generally 0.25~2% of the filler.

5. Some surfactants will affect the performance of titanate coupling agents, such as HSt, etc., so they should be added after the filler, coupling agent, and resin are fully mixed. 6. Most titanate coupling agents are easy to undergo transesterification reaction with ester plasticizers. Therefore, such coupling agents need to be added after the coupling agent is added. The synergistic effect of mixing titanate and silane coupling agents is good.

Having introduced so much, I believe everyone has a certain understanding of silane coupling agents. If you want to know more about silane coupling agents, please contact Heshan KBORON New Material Co., Ltd.

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