What are the classifications of coupling agents?

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Coupling agent, also known as surface modifier, can reduce the viscosity of synthetic resin melt during plastic processing, improve the dispersion of filler to improve processing performance, and thus obtain good surface quality and mechanical, thermal and electrical properties. performance. Today, Jiuzhi Plastics Network Xiaobian mainly tells you about the classification of coupling agents. According to the chemical structure and composition of the coupling agent, it is divided into four categories: organic chromium complex, silane, titanate and aluminate compound:

Chromium complex coupling agent
The chromium complex coupling agent was developed in the early 1950s. The metal chromium complex formed by unsaturated organic acid and trivalent chromium ion has mature synthesis and application technology, and the cost is low, but the variety is relatively simple.
A silane coupling agent
The general formula of the silane coupling agent is RSiX3, wherein R represents a group such as an amino group, a mercapto group, a vinyl group, an epoxy group, a cyano group or a methacryloyloxy group, and these groups and different matrix resins are strong. The reactivity of the reaction, X represents an alkoxy group capable of being hydrolyzed (e.g., methoxy, ethoxy, etc.). There are several types of silane coupling agents in China: KH550, KH560, KH570, KH792, DL602, and DL171.
Titanate coupling agent
According to their unique molecular structure, titanate coupling agents include four basic types: 1 monoalkoxy type coupling agents are suitable for a variety of resin-based composite systems, especially suitable for free water, only Chemically bonded water or physical water filling system; 2 monoalkoxy pyrophosphate type This type of coupling agent is suitable for resin-based composite systems, especially suitable for filler systems with high moisture content; 3 chelation type Coupling agents are suitable for a variety of resin-based composite systems. Due to their very good hydrolytic stability, such coupling agents are particularly suitable for aqueous polymer systems. 4. Coordinating agents are used in a variety of coupling agents. Good coupling effect in resin-based or rubber-based composite systems overcomes the shortcomings of conventional titanate coupling agents used in resin-based composite systems.

Other coupling agent
The zirconium coupling agent is a low molecular weight inorganic polymer containing zirconium aluminate. It not only promotes adhesion between different materials, but also improves the performance of composite systems, especially rheological properties. These coupling agents are suitable for a wide range of thermosetting resins as well as a variety of thermoplastic resins, in addition to magnesium coupling agents and tin coupling agents. A chemical that enhances the interfacial adhesion between resin and reinforcement in reinforced plastics. At the interface of the resin matrix and the reinforcing material, a strongly bound substance is promoted or established.
Note: The coupling agent can be applied to the reinforcing material or added to the resin, or both.

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