The difference between coupling agent, crosslinking agent and compatibilizer in use

1. The difference between coupling agent and crosslinking agent

Crosslinking agent usually refers to a class of chemical additives that participate in the crosslinking reaction of the resin to connect the active functional groups in the resin to form a network structure. The cross-linking agent can mainly improve the viscosity and elasticity of the working fluid, and at the same time, according to the geological characteristics of the reservoir, it should also have certain characteristics such as temperature resistance and salt resistance.

Using a small amount of coupling agent can improve the reactivity of organic and hydrolyzable groups and the fixability of carbon groups on the surface of organic materials, that is, he can It acts as a bridge between the resin and the interface, increasing the adhesion of coatings and adhesives.

There is not much difference between the two. The coupling agent is a substance with two different functional groups. Part of the functional groups in their molecules can react with adsorbed water or hydroxyl groups on the surface of inorganic substances, and part of the functional groups can react with organic molecules to form bonds or couplings. Cross-linking agents are not much different from bridging agents, they can both cross-link linear molecules into a network structure.

Crosslinking agents are mainly used in polymer materials, because the molecular structure of polymer materials is like long lines, and the strength is low when there is no crosslinking, and it is easy to The function of the crosslinking agent is to generate chemical bonds between the linear molecules, so that the linear molecules are connected to each other to form a network structure, which improves the strength and elasticity of the rubber.

Second, the difference between coupling agent and compatibilizer:

Both can be called surfactants, but they are used in different ways.

1. Compatibilizer is used to improve the compatibility between polymer blends, that is, between two different resins in polymer alloys. All are reactive extrusion polyolefin grafted maleic anhydride, GMA and other reactive grafts, as well as synthetic polar polymers.

2. The coupling agent is mainly used between inorganic and organic, and its function is to improve the compatibility between the filler and the resin molecular chain, and the high filler in the resin Dispersion, such as silane, aluminate, titanate coupling agent;