Silane Coupling Agents: Types, Applications and Benefits
Silane coupling agent is a kind of organic silane compound or oligomer containing both organic functional groups and silicon functional groups, which can be used to improve the bonding strength between organic polymers and inorganic substances.
Silane coupling agent was originally used to improve the performance of glass fiber reinforced resin matrix composite (FRP) products. With the development of polymer material industry, in order to improve the physical and chemical properties of plastics, rubber, coatings, adhesives, sealants, etc performance, reduce the production cost of polymer material products, and the application of silane coupling agents as monomers for crosslinking, chain extension and grafting of these materials or viscosity-increasing and reinforcing aids is becoming more and more extensive.
vinyl
Silane coupling agent
Vinyl silane coupling agents can improve the interfacial properties of two substances with completely different properties when dealing with glass fibers and granular fillers in inorganic/resin-based composite materials, and greatly increase the strength of composite materials. The vinyl or ethylene hydrocarbon group in this type of coupling agent has polymerization or copolymerization reactivity, which can make the polymer easy to crosslink , thereby improving the mechanical properties, electrical properties and surface properties of the modified polymer . It is often used in polyethylene Modification of thermoplastics or rubber.
Aminos
Silane coupling agent
Aminosilane coupling agent can react with almost all resins except polyester resin, and is a general- purpose coupling agent . And it is catalytic , and can be used as a catalyst in the polymerization of phenolic formaldehyde, urea formaldehyde, and melamine formaldehyde, and is widely used.
Used for glass fiber surface treatment, improving the bonding performance of glass fiber and resin, and improving the mechanical properties of composite materials ;
It is used to process plastics filled with inorganic fillers, improve the dispersion of fillers in resins, and increase the strength of plastics ;
Tackifiers for sealants, adhesives and coatings ;
Used as a textile auxiliary to improve the softness and wrinkle resistance of fabrics ;
It is used in biochemistry and environmental protection, and as the raw material of biological enzyme carrier, it can improve the utilization rate of biological enzyme .
Sulfur-containing hydrocarbons
Silane coupling agent
Sulfur-containing silane coupling agent can be used as a surface modifier for inorganic fillers in the rubber tire industry, which can improve the surface structure of silica and carbon black, improve their agglomeration in organic matter, and make them well dispersed in rubber , Improve the strength and wear resistance of rubber . At the same time, the sulfur in the sulfur-containing silane coupling agent can be combined with the rubber to form a firm network structure between the filler and the rubber, and can be used as a vulcanizing agent, wetting agent, reinforcing agent, etc. to improve multiple physical and mechanical properties of rubber tires : Such as skid resistance (can save energy ) , wear resistance, tear resistance, cut resistance, etc.
Epoxy hydrocarbons
Silane coupling agent
The application of epoxy-based silane coupling agent is universal , not only can be used in epoxy, melamine, phenolic, cross-linked polyurethane and other thermosetting composite materials, but also can be used in chlorinated polyether, polycarbonate, polyester , polyurethane, nylon, polypropylene, polystyrene and other thermoplastic composite materials. Compared with other functional silane coupling agents, epoxy silane coupling agents are more stable and less prone to yellowing , and can provide excellent properties of reinforcement, weather resistance, moisture resistance, and compatibilization in organic polymer composite materials .
Methacryloxy
Silane coupling agent
This type of silane coupling agent has dual characteristics of polymerization reaction and copolymerization reaction at the same time . It can be used not only for resin composite materials, but also for chemical structural modification of silicone or organic polymer materials . Since such silane coupling agents are prone to free radical-induced polymerization reactions under heating or light conditions, they are often used as photo-initiated polymerization crosslinking groups in photo-curable silicone coatings, varnishes or adhesives.
As a “bridge” between organic and inorganic materials, silane coupling agents are not only widely used in rubber, coatings, plastics and other fields, but also in the application of masonry, ceramics, wood and cement and other substrates.
