Silicone Window & Door Sealant
The amount of silane coupling agents is large and there are many varieties, and its 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. Silane coupling agents are widely used in the surface modification of nanoparticles, anti-corrosion surface treatment of glass fibers and metals, and as tackifiers for coatings and sealants, which can greatly improve material performance.
The development of the automobile industry has promoted the development of the rubber industry. At present, the most used surface modifiers in the tire industry are mostly sulfur-containing silane coupling agents. The sulfur-containing silane coupling agent forms a firm network structure through the combination of sulfur and rubber and the combination of alkoxy groups and silanol groups on the surface of the white carbon black, thus reducing the rolling resistance of tires.
As a general-purpose coupling agent, aminosilane coupling agents can couple with almost all kinds of polymer resins. Due to the existence of free amino groups, this type of silane coupling agent has high alkalinity and high reactivity, and the flexural strength of the molding material also increases with the increase of amino groups. The disadvantage of this kind of silane coupling agent is that it is easy to have premature reaction in the process of use, thus can not achieve the expected effect.
As a new type of urea-group-containing silane coupling agent, γ-ureidopropyl triethoxysilane is a neutral water-soluble compound with a pH value of about 7, which can react with most resins at low temperature with slightly reduced reactivity while maintaining a certain working performance.
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 still maintains good physical properties and adhesion at room temperature for more than 12 months, thus showing good long-term storage stability in water-based properties.
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