Selection and application of coupling agent-Iota

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News > Dynamic industry > Selection and application of coupling agent

Selection and application of coupling agent

The coupling agent according to the chemical structure can be divided into: silane coupling agent, titanate coupling agent and coupling agent.
In general, the functional groups at both ends of the coupling agent are respectively related to the dispersion of the filler and the matrix polymer. Because of different filler, coupling effect varies greatly, for example silane coupling agent for silica, 3 oxidation 2 aluminium, glass fiber, clay, silicate, silicon carbide have significant effect, the effect of talcum powder, clay, aluminum hydroxide, wollastonite, iron, aluminum and other poorer and the effect of asbestos, titanium dioxide, iron oxide is not too large, the effect of calcium carbonate, graphite, carbon black, barium sulfate, calcium sulfate is very small.
The surface with silanol groups on the filler and big coupling effect of silane coupling agent, and for calcium, magnesium, barium carbonate, sulfate, sulfite, the coupling effect of silane coupling agent is not too obvious. If silica hydrosol treatment no filler particles of the silanol groups on the surface, and then the use of silane coupling agent, then it will produce better coupling effect, the processing method called double coating method.
The surface of titanate coupling agent and aluminate coupling agent can handle packing, just deal with the effect of the targeted certain. Such as titanate coupling agent treatment effect is better filler with calcium carbonate, barium sulfate, calcium sulfate, sulfite calcium, aluminum hydroxide, magnesium hydroxide, calcium silicate, aluminum silicate, titanium dioxide, asbestos, alumina, ferric oxide,
Lead oxide, ferrite; treatment effect was slightly higher than that of the filler mica, silica, magnesium oxide and calcium oxide and; treatment effect is poor filler talcum powder, carbon black, wood powder; had little effect on a graphite, magnetic powder, clay, paint, etc.. But also according to the specific varieties of coupling agent, grades, dosage, etc..

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