Silane coupling agents are a type of organic silicon compounds containing two different chemical properties in the molecule, used to improve the actual bonding strength between polymers and inorganic materials. This may refer to an increase in true adhesion, as well as improvements in wettability, rheological properties, and other operational properties. Coupling agents may also have a modifying effect on the interface area to enhance the boundary layer between organic and inorganic phases.
Therefore, silane coupling agents are widely used in industries such as adhesives, coatings and inks, rubber, casting, fiberglass, cables, textiles, plastics, fillers, and surface treatments.
Its classic product can be represented by the general formula XSiR3, where X is a non hydrolytic group, including alkenyl groups (mainly Vi) and hydrocarbon groups with functional groups such as CI and NH2 at the end, i.e. carbon functional groups; R is a hydrolyzable group, including OMe, OEt, etc.
The functional groups carried in X are prone to react with functional groups in organic polymers, such as OH, NH2, COOH, etc., thereby connecting silane and organic polymers; When the functional group is hydrolyzed, Si-R is converted into Si-OH and by-products such as MeOH, EtOH, etc. are generated. Si OH can undergo condensation and dehydration reactions with Si OH in other molecules or Si OH on the surface of the treated substrate to form Si O-Si bonds, and even react with certain oxides to form stable Si O bonds, allowing silane to connect with inorganic or metal materials.
Common silane coupling agents include:
Sulfur-containing silane: bis – [3- (triethoxysilicon) propyl] – tetrasulfide, bis – [3- (triethoxysilicon) propyl] – disulfide
Aminosilane: y-aminopropyltriethoxysilane, N-B – (aminoethyl) – v-aminopropyltrimethoxysilane
Vinylsilane: Vinyltriethoxysilane, Vinyltrimethoxysilane
Epoxysilane: 3-glycidyl ether oxypropyltrimethoxysilane
Methacryloxysilane: y methacryloxypropyltrimethoxysilane, v methacryloxypropyltrimethoxysilane
Post time: Aug-23-2023