New type of silane coupling agents is reviewed
Silane coupling agents are a kind of organic silicon compound with special structure. In its molecule, both with inorganic materials such as glass, cement, metal, etc.) in combination with reactive groups and with organic materials, such as synthetic resin, etc.) in combination with reactive groups. Therefore, by silane coupling agent can make the two kinds of material interface coupling up performance difference is very big, in order to improve the performance and increase the bonding strength of composite materials, thereby gaining performance and reliable new composite materials. Silane coupling agents has become more important in the status of organic silicon industry, has become a modern organic silicon industry, organic polymer, composite material industry and related technology in the field of indispensable chemical additives. The application of silane coupling agent is very extensive.
Silane coupling agents are with low surface energy, wetting ability is higher, can be dealt with evenly distributed on the surface, so as to improve the compatibility and dispersity of between dissimilar materials. The effect of silane coupling agent is improving the wetting ability of the organic material of reinforced material.
In fact, the Silane coupling agents in different material interface coupling process is a complicated solid-liquid surface physical and chemical process. First of all, silane coupling agent of high viscosity and low surface tension, wetting ability, for glass, ceramic and metal surface contact Angle is small, can quickly spread on the surface, make the inorganic material surface humid by silane coupling agent; Shop once a second, Silane coupling agents on the surface, the surface is wet the, Silane coupling agent molecules on the surface of the two groups was similar to the polarity, due to the total adsorption material surface with thin layer in the atmosphere, the end of the alkoxy hydrolysis produce silicon hydroxyl and orientation in the surface of inorganic materials, at the same time and the material surface hydroxyl hydrolytic polycondensation reaction; Organic group orientation in material surface, in crosslinking curing, both in chemical reactions, and completed the coupling process between dissimilar materials.