What is the coupling agent?
Coupling agent, also known as surface treatment agent, is a substance that can chemically and/or physically combine two materials that are very different in nature and that are not easily bonded. It is mainly used for inorganic reinforcing materials or Between the filler (polar) and the non-polar polymer. The coupling agent not only can closely bond the filler and the polymer to achieve good mechanical strength, but also the diameter of the aggregated particles is mostly reduced after the filler is treated by the coupling agent, which can improve the dispersibility of the filler in the polymer and make the filler The fluidity of the polymer system is improved. These factors are all beneficial to improve the mechanical properties, apparent quality and processing properties of the product.
The coupling agent can be roughly classified into a silane type, a titanate type, an aluminate type, a zirconate type, a chromium complex type, and other higher fatty acids, alcohols, esters, and the like, but the first two are widely used. Kind. The function of the silane coupling agent is to change the interface of the different phases. In the filling and blending modification of polymers, etc., the coupling reaction can form a chemical covalent bond from the organic phase through the silane coupling agent to the inorganic phase, resulting in good adhesion between the organic component and the inorganic component and The bonding is stable under poor conditions. The titanate coupling agent reacts with free protons at the inorganic interface to form an organic monolayer on the inorganic interface, forming a molecular bridge between the interfaces of the two different materials. The titanate-treated inorganic compound generally has hydrophobicity and organophilicity, and functions as an organic functional group, so that the dispersibility of the plastic is enhanced and it is easy to combine with a polymer or an organic compound.
The basic principle of using a coupling agent is that an acidic filler should use a coupling agent containing a basic functional group, and an alkaline filler should use a coupling agent containing an acidic functional group. In addition, decisions are made based on the type of organometallic, the specific chemical structure of the binder components, and the desired final properties.
The role of coupling agent
Coupling agent is a very common chemical raw material in our life. In plastic compounding, the coupling agent is a plastic additive that improves the interfacial properties of synthetic resin and inorganic filler or reinforcing material. The coupling agent is also called surface modification. Sex agent. It can reduce the viscosity of the synthetic resin melt during the plastic processing process, improve the dispersion of the filler to improve the processing performance, and thus obtain good surface quality and mechanical, thermal and electrical properties.
Coupling agents are widely used. We have seen coupling agents in many fields. In glass fiber and glass reinforced plastics, coupling agents are often used to improve the wet physical and mechanical strength and wet electrical properties of composite materials. And improve the bundleability, protection and processing technology of glass fiber. The coupling agent in the adhesive and the coating can improve the adhesion in the wet state, the weather resistance, the improvement of the pigment dispersibility, the improvement of the abrasion resistance and the crosslinking of the resin. The coupling agent in the foundry industry can increase the strength of the resin sand to achieve high and low gas generation. The coupling agent in the rubber can improve the mechanical strength, wear resistance, wet electrical properties and rheology of the product. The coupling agent can also improve the adhesion of the wet sealant, improve the dispersibility of the filler, and the wear resistance of the product. The coupling agent in the textile can make the textile soft and full, improve its water repellency, and adhesion to the dye. Coupling agents are often used in printing inks to improve the wettability of adhesion.
Coupling agents can also play a large role in polyethylene and fillers. In summary, coupling agents work very broadly and are quite important. Do you understand the role of coupling agents now?
Coupling agent application field
1. Glass fiber and glass steel: improve the wet physical and mechanical strength and wet electrical properties of composite materials, and improve the bundleability, protection and processing technology of glass fiber.
2. Adhesives and coatings: Improve adhesion and weatherability in wet state, improve pigment dispersion, improve wear resistance and cross-linking of resin.
3. Casting: Improve the strength of the resin sand. To achieve height, low qi.
4. Rubber: Improve the mechanical strength, wear resistance, wet electrical properties and rheology of the product.
5, sealant: Improve the adhesion of the wet state, improve the dispersion of the filler, the wear resistance of the product.
6. Textile: Make the textile soft and full, improve its water resistance, and adhesion to dyes.
7. Printing ink: Improve the wettability of adhesion.
8. Filler surface treatment: Improve the compatibility, wettability and dispersibility of filler and resin in the resin.
9. Cross-linked polyethylene: used to strengthen the strength of cross-linked polyethylene cable and hot water pipe. Durability and longevity.
What is the coupling agent? What is the role of the coupling agent? Xiaobian introduced this and hopes to help everyone.
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