Silane coupling agents are mainly suitable for glass fibers and silicon-containing fillers, such as quartz, wollastonite, etc. They can also be used for oxides and hydroxides of some metals, but not for CaCO3. The resin is mainly a thermosetting resin.
Titanate coupling agents have a wide range of applications for fillers, such as CaCO3, titanium dioxide, etc., and can also be used in glass fibers. The resin is mainly a thermoplastic resin.
Acidic fillers should use coupling agents containing basic functional groups, while basic fillers should use coupling agents containing acidic functional groups.
The amount of coupling agent added. The dosage of silane coupling agent can be about 1% of the filler; the dosage of titanic acid is generally 0.25~2% of the filler.
Some surfactants will affect the performance of titanate coupling agent, such as HSt, so they must be added after the filler, coupling agent and resin are fully mixed.
Most titanate coupling agents are prone to transesterification with ester plasticizers. Therefore, such coupling agents can only be added after coupling agents are added. The synergistic effect is good when titanates and silane coupling agents are added together.
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