The rules and general principles for selecting silane coupling agents

Pre selected organosilane coupling agents can follow the following rules:

1. Unsaturated polyethylene glycol can be used as ethylene based, epoxy based, and methacryloxy based organic silane coupling agents;

2. Epoxy resin should use epoxy based or amino based organosilane coupling agents;

3. Phenolic resin should use amino or substituent based organosilane coupling agents;

4. Ethylene based organosilane coupling agents should be selected for olefin polymers;

5. Sulfur vulcanized rubber should use hydrophobic organic silane coupling agents, etc.

General principles for selecting silane coupling agents:

It is necessary to comprehensively consider the composition of the material and its sensitivity to the reaction of silane coupling agents. To improve hydrolysis stability and reduce modification costs, trialkylsilane can be added to silane coupling agents for use; For difficult to stick materials, polymers crosslinked with silane coupling agents can also be shared.

When silane coupling agents are used as thickening agents, they mainly form chemical and hydrogen bonds with polymers; Wetting and surface energy effects: achieved by improving polymer crystallinity, acid-base reactions, and the generation of interpenetrating polymer networks. The increase in viscosity mainly revolves around three systems:

(1) Inorganic materials versus organic materials;

(2) Inorganic materials to inorganic materials;

(3) Organic materials to organic materials.

For the first type of bonding, it is usually required to bond inorganic materials to polymers, so priority should be given to the reactivity between Y in silane coupling agents and the functional groups contained in polymers. The latter two types of bonding belong to the same type of materials, so silane coupling agents are chosen for their own anti hydrophilic polymers and inorganic materials that require increased adhesion.