Silane coupling agent has a large amount and many varieties, and its structure is usually expressed by Y-R-SiX3. Wherein, X is a halogen or alkoxy, under the action of water, Si-X becomes Si-OH, to achieve the connection of inorganic surface and silane. R is a long-chain alkane, Y is an organic functional group such as amino, vinyl, Methacryloyloxy, sulfhydryl and epoxy, easy to react with polymers. Silane coupling agents are widely used in the surface modification of nanoparticles, the anti-corrosion surface treatment of glass fiber and metal, and the tackifier of coatings and sealants, which can greatly improve the properties of materials.

Let's take a look at the three classifications of silane coupling agents.

1. Sulfur-containing silane coupling agents

The development of automobile industry has promoted the development of rubber industry. At present, most of the surface modifiers used in tire industry are sulfur-containing silane coupling agents. The sulfur-containing silane coupling agent forms a solid network structure and reduces the rolling resistance of the tire by combining sulfur with rubber and alkoxy with silicon hydroxyl on the surface of silica.

2. Amino silane coupling agents

As a general coupling agent, amino silane coupling agent can almost couple with various polymer resins. Due to the existence of free amino groups, such silane coupling agents are highly alkaline and have higher reactivity, and the flexural strength of the molding material increases correspondingly with the increase in amino groups. The disadvantage of this type of silane coupling agent is that it is prone to premature reaction during use so that the expected effect cannot be achieved.

γ-ureidopropyltriethoxysilane (A-1160), as a new type of ureido-containing silane coupling agent, is a neutral water-soluble compound with pH around 7. It can react with most resins at low temperature with slightly reduced activity, while maintaining a certain working performance.

As the representative varieties of heat-resistant silane coupling agents, Y-5475 and Y-5669, due to the combination of silicon atoms and benzene ring, have a heat-resistant temperature of 60-100°C higher than traditional products.

3. Epoxy silane coupling agents

The traditional silane coupling agent is prone to pre-crosslinking with water, which limits its application in polyester materials.

With the development of research technology, the epoxy silane coupling agent represented by 3- (2.3-epoxy propoxy) propyloxysilane (A-187) still maintains good physical properties and adhesion at room temperature for more than 12 months, showing good long-term storage stability in aqueous properties.

Hubei Co-Formula Material Tech Co., Ltd. is a globally recognized ISO certified manufacturer and reliable supplier of silicone materials. Since its establishment, Co-Formula has been involved in the silicone industry, mainly focusing on the production and sales of functional silanes, silicone oils, silicone polymers and additives. If needed, please feel free to contact us.