1. Glass fiber surface treatment

As an inorganic non-metallic material, glass fiber has good insulation, strong heat resistance, good corrosion resistance, and high mechanical strength. It is often used as a reinforcing material, electrical insulation material and thermal insulation material in composite materials. However, the surface of the glass fiber is highly polar and difficult to be compatible with non-polar resins, which greatly reduces its filling effect. In order to improve the bonding performance of resin and glass fiber and improve the strength, electrical and weather resistance of glass fiber reinforced composite materials, it is necessary to modify the surface of glass fiber. At present, the most commonly used surface modifier for glass fiber surface modification is silane coupling agent, and its varieties mainly include: vinyl silane, amino silane, methacryloxy silane, etc.

2. Inorganic filler surface treatment

Polymer materials such as plastics and rubbers need to be added with different inorganic fillers to meet their different performance. Composite materials can achieve material recombination through direct interface contact. Therefore, the nature and microstructure of the interface directly affect its physical properties and bonding force.

The surface of general inorganic fillers is hydrophilic and cannot be well dispersed in resin and rubber during use, which will seriously affect the performance of composite materials. In practical applications, the surface modification of the filler makes the filler hydrophobic, which can give full play to the function of the inorganic filler.

Surface treatment of inorganic fillers with silane coupling agents can form a non-polar molecular film on the surface of the fillers, improve the stability, dispersion and adhesion of the fillers in rubber and plastics, and improve the filled plastics (including rubber) The electrical, mechanical and weather resistance properties of the product, and promote the improvement of process performance.

3. Surface modification of nano powder

Nano powder has the characteristics of small particle size and large specific surface area, so it has unique small size effect, tunnel effect and surface effect, so it is favored for its excellent reinforcement, stability, and thickening. It is widely used in coatings and other fields.

Because the surface energy of nano powder is large and easy to agglomerate, it limits its ultrafine effect and is difficult to disperse and infiltrate in the organic phase. Therefore, surface modification is performed to improve its compatibility and binding force with organic molecules.

The coupling agent molecule is used to carry out a certain chemical reaction with the surface of the nano powder, and the coupling agent is uniformly covered on the surface of the nano powder, thereby improving the hydrophobicity of the nano powder. It is a commonly used method for modifying the nano powder. Commonly used silane coupling agents and titanate coupling agents and aluminate coupling agents.

4. Used as a tackifier for sealants, coatings, etc.

As a tackifier, silane coupling agent is widely used in adhesives, sealants, coatings and other fields to improve their bonding strength, water resistance, and weather resistance.

The introduction of functional silane coupling agent into the coating can make the silane and the film-forming polymer of the coating form an interpenetrating network polymer (IPN) or cross-link with the film-forming polymer of the coating, thereby promoting the wetting of the coating to the substrate , Improve the adhesion of the coating. In addition, alkyl and aryl silanes can also improve the gloss, hiding power, miscibility, wettability and dispersion properties of the paint film.

5. Other aspects

Silane coupling agents are also widely used in metal surface treatment and other industries.

Having introduced so much, I believe that everyone has a certain understanding of silane coupling agent. If you want to know more about and cooperation matters, please contact Heshan KBORON New Material Co., Ltd.

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