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The main functions of coupling agents
Release Date:
2025-07-04
The main functions of coupling agents include:
1. Enhancing interfacial bonding and adhesion strength: Coupling agents facilitate the formation of chemical bonds or adsorption between inorganic and organic materials through their molecular groups, which react with the materials, thus establishing a strong bond and significantly enhancing adhesion strength.
2. Improving adhesion: In applications such as coatings and adhesives, coupling agents enhance the adhesion between the coating or adhesive and the substrate, making the coating more durable and improving the adhesive's performance.
3. Improving dispersion and ensuring uniform distribution of fillers: When adding inorganic fillers to plastics and rubbers, coupling agents reduce the interfacial tension between the filler and the organic matrix, ensuring that the filler is evenly distributed and preventing agglomeration and sedimentation. For example, adding talc treated with titanium coupling agent to polyethylene can improve its rigidity, heat resistance, and dimensional stability.
4. Enhancing pigment dispersion: In systems like coatings and inks, coupling agents help improve pigment dispersion, ensuring even distribution and enhancing the color, hiding power, and weather resistance of the product. For instance, using titanium coupling agent in water-based coatings can improve pigment dispersion and stability, enhancing the adhesion and weather resistance of the coating.
5. Improving processing performance and reducing melt viscosity: During plastic processing, coupling agents reduce the viscosity of synthetic resin melts, making the plastic easier to flow and form, thus improving processing efficiency and reducing energy consumption. For example, adding calcium carbonate fillers treated with titanium ester coupling agents to polypropylene can reduce the viscosity of the polypropylene melt, thereby improving its processing properties.
6. Improving processing technology: Coupling agents enhance the interaction between fillers and the organic matrix during processing, reducing friction and wear, and improving the surface quality and dimensional accuracy of the product.
7. Enhancing material performance and mechanical properties: By improving the interface bonding and dispersion between fillers and the matrix, coupling agents significantly enhance the mechanical properties of composite materials, such as strength, hardness, and toughness.
8. Improving heat and weather resistance: Coupling agents make materials more stable in harsh environments like high temperatures, humidity, and UV light, thereby enhancing their heat resistance, weather resistance, and corrosion resistance.
9. Endowing materials with special functions: Certain coupling agents can impart special properties to materials, such as conductivity, thermal conductivity, and magnetism. For example, by uniformly dispersing conductive nanoparticles in the polymer matrix using titanium ester coupling agents, conductive composite materials can be produced.
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