Fluorosilane coupling products are used in large quantities and are of many varieties, and their structure is usually represented by Y-R-SiX3. Among them, X is a halogen or an alkoxy group, and under the action of water, Si-X becomes Si-OH to realize the connection between the inorganic surface and silane. R is a long-chain alkane, and Y is an organic functional group such as amino group, vinyl group, methacryloyloxy group, mercapto group, epoxy group, etc., which is easy to react with the polymer. Fluorosilane coupling agent products are widely used in nanoparticle surface modification, glass fiber and metal anti-corrosion surface treatment, coating and sealant tackifier, which can greatly improve material performance.
Three classifications of Fluorosilane coupling agent products
1. Contains Fluorosilane coupling agent products
The development of the automobile industry has promoted the development of the rubber industry. At present, most of the surface modifiers used in the tire industry are sulfur-containing silane coupling agents. The sulfur-containing silane coupling agent combines sulfur in the structure with rubber, and alkoxy groups combine with silanol groups on the surface of silica to form a firm network structure and reduce the rolling resistance of tires.
2. Amino silane coupling agent
As a general-purpose coupling agent, Fluorosilane coupling agent products can be coupled with almost all kinds of polymer resins. Due to the existence of free amino groups, this type of silane coupling agent has high basicity and high reactivity, and the flexural strength of the molding material increases correspondingly with the increase of amino groups. The disadvantage of this type of silane coupling agent lies in the use process. Premature reactions are prone to occur and the expected results are not achieved.
γ-ureidopropyl triethoxysilane (A-1160), as a new type of urea group-containing silane coupling agent, is a neutral water-soluble compound with a pH value of about 7. Reactions with slightly reduced activity are carried out at low temperatures while maintaining a certain working performance.
As the representative varieties of heat-resistant silane coupling agents, Y-5475 and Y-5669 have a heat-resistant temperature of 60-100°C higher than traditional products due to the combination of silicon atoms and benzene rings.
3. Fluorosilane coupling agent products of epoxy group
The traditional silane coupling agent is prone to pre-crosslinking reaction with water, which limits its application in polyester materials. With the development of research technology, the epoxy-type silane coupling agent represented by 3-(2.3-glycidoxy)propyloxysilane (A-187) can be stored well for more than 12 months at room temperature physical properties and adhesion, thus showing good long-term storage stability in water-based properties.