The difference between coupling agent and crosslinking agent and compatibilizer

The difference between coupling agent and crosslinking agent:

Crosslinking agents generally refer to a class of chemicals that participate in the crosslinking reaction of resins to connect 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. In addition, some additives will be added to improve the overall performance of the working fluid.

Coupling agents generally refer to small molecule chemicals containing 3 or more hydrolyzable carbon functional groups. A small amount can improve the durability of organic and inorganic materials. The well-known adhesive properties, the reactivity of hydrolyzable groups and the fixability of carbon groups on the surface of organic materials, that is to say, he can form a bridge between the resin and the interface, increasing the strength of coatings and adhesives. Adhesive force, less dosage.
The difference between the two is not very big. The coupling agent is a kind of 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. The cross-linking agent is not much different from the bridging agent, both of them can make the linear molecules cross-link each other into a network structure.
Crosslinking agents are mainly used in polymer materials, because the molecular structure of polymer materials is like long lines without crosslinking When the strength is low, it is easy to break and has no elasticity. 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. The cross-linking agent used in the process is mainly sulfur, and an accelerator is added.

The difference between coupling agent and compatibilizer:

In a sense, both are surfactants with different uses.

1. The coupling agent is mainly used between inorganic and organic. Its main function is to improve the compatibility between fillers and resin molecular chains. Dispersion in medium, such as silane and titanate coupling agents;

2. The compatibilizer is used to improve the compatibility between the blended polymers, that is, the compatibility between two different resins in the polymer alloy. All are reactive extrusion polyolefin grafted maleic anhydride, GMA and other reactive grafts, as well as synthetic polar polymers.

Coupling agent effective time:

The environment where the coupling agent is used, such as humidity, storage time, ink and paint formulations and ph value, etc. Most titanates and silanes are weakly alkaline and decompose into alcohols by hydrophilicity. Their effect is poor in the wet and rainy seasons in the south, and it takes longer to dry in the north. It is also necessary to check whether the spray interface is weakly acidic or acidic. Common There are nothing more than three series of KH (silane), A (titanate) and N (azo), which are reactive to water, alcohol, ether, ammonia, amine and acid and lose their coupling ability after the reaction. Long-term storage should pay attention to oxygen avoidance and frequent sampling inspection.