Since the 1960s, scientists study the mechanism of coupling agent.
Has made great progress, although not yet a consensus, but explained by
chemical bond theory has been confirmed by a large number of
experiments. R-Si-OR the type of coupling agent of different end group
can react with polymers and fiber respectively to bond.By connecting two
phase of the chemical bonds of interfacial bonding to improve.Tesla's
research shows that deposition on the surface of the glass fiber,
coupling agent usually contains components of physical and chemical
adsorption of non-uniform layers, rinse with cold water to wash it by
hydrogen bonding connection part of the coupling agent, wash with hot
water can wash away with silica and the key connection body, at the end
of the molecular layer, fiber with multiple key silica and silane
coupling agent combined with very strong, it plays a main role to
improve the interface bonding strength, and physical adsorption of the
components is ineffective or even harmful.So the concentration of the
coupling agent on the interface bonding can also have an impact, such as
glass fiber in different concentrations of KH550 (gamma - ammonia
propyl triethoxy silane) soaked in the solution after 10 min made
sample, test results show that the coupling agent content was 0.4% ~
0.4% (mass fraction) within the scope of the effect is best, in 8% of
high content in the solution treatment effect is the worst.When coupling
agent concentration is too low, the glass fiber on the adsorption
capacity is insufficient, the concentration is too high adsorption in
silane is arranged on the surface of the fiber mixed and disorderly, the
corresponding physical adsorption layer thickening, unfavorable to
interface bonding.
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