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What is a Coupling Agent

Oct 13, 2020

Coupling agent is a kind of substance with two functional groups with different properties. The biggest feature of its molecular structure is that the molecule contains two groups with different chemical properties. One is an inorganic-philic group that easily reacts with the surface of inorganic substances. The other is an organophilic group, which can chemically react with synthetic resins or other polymers or generate hydrogen bonds to dissolve them. Therefore, coupling agents are called "molecular bridges" to improve the interface between inorganic and organic materials, thereby greatly improving the properties of composite materials, such as physical properties, electrical properties, thermal properties, and optical properties. Coupling agents are used in the rubber industry to improve the wear resistance and aging resistance of tires, rubber sheets, hoses, rubber shoes and other products, and can reduce the amount of NR, thereby reducing costs. The function of the coupling agent in the composite material is that it can not only react with certain groups on the surface of the reinforcing material, but also with the matrix resin, forming an interface layer between the reinforcing material and the resin matrix, and the interface layer can transmit stress. This enhances the bonding strength between the reinforcing material and the resin, improves the performance of the composite material, and can also prevent other media from penetrating to the interface and improve the interface state, which is beneficial to the aging resistance, stress resistance and electrical insulation properties of the product.
According to the chemical structure and composition of the coupling agent, it is divided into four categories: organic chromium complexes, silanes, titanates and aluminates
Main functions
Glass fiber, glass fiber reinforced plastic: improve the wet physical and mechanical strength and wet electrical properties of composite materials, and improve the bundling, protection and processing technology of glass fiber.
Adhesives and coatings: improve the wet adhesion, weather resistance, improve pigment dispersion, improve wear resistance and resin crosslinking.
Casting: Improve the strength of resin sand. To achieve high and low gassing.
Rubber: Improve the mechanical strength, wear resistance, wet electrical properties and rheology of products.
Sealant: Improve wet adhesion, improve filler dispersion, and product wear resistance.
Textile: Make textiles soft and plump, improve their water resistance, and their adhesion to dyes.
Printing ink: Improve the wettability of adhesion.
Filler surface treatment: Improve the compatibility, wettability and dispersibility of filler and resin in resin.
Cross-linked polyethylene: used to increase the strength of cross-linked polyethylene cables and hot water pipes. Durability and service life.
The main purpose
Among the reinforced plastics, a chemical substance that can improve the bonding force between the resin and the reinforced material.
A substance that promotes or establishes a strong bond at the interface between the resin matrix and the reinforcing material.
Note: The coupling agent can be applied to the reinforcing material or added to the resin, or a combination of both.
Application areas, main functions:
Glass fiber, glass fiber reinforced plastic: improve the wet physical and mechanical strength and wet electrical properties of composite materials, and improve the bundling, protection and processing technology of glass fiber.
Adhesives and coatings: improve the wet adhesion, weather resistance, improve pigment dispersion, improve wear resistance and resin crosslinking.
Casting: Improve the strength of resin sand. To achieve high and low gassing.
Rubber: Improve the mechanical strength, wear resistance, wet electrical properties and rheology of products.
Sealant: Improve wet adhesion, improve filler dispersion, and product wear resistance.
Textile: Make textiles soft and plump, improve their water resistance, and their adhesion to dyes.
Printing ink: Improve the wettability of adhesion.
Filler surface treatment: Improve the compatibility, wettability and dispersibility of filler and resin in resin.
Cross-linked polyethylene: used to increase the strength of cross-linked polyethylene cables and hot water pipes. Durability and service life.

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