Appearance: colorless to light transparent liquid
Active ingredient: 74%-78%
p H: (0.1% distilled water solution) 9.0-11.0
Amino-containing silane coupling agents usually refer to HaN-R-Si=, Hz NCH CHaNH-R-Si=, CH.NH-R-Si=, this type of coupling agent can open the ring of the epoxy group, thus It is often used as a curing agent for epoxy resins. It can be added to unsaturated acids such as acrylic acid and their derivatives, can also react with carboxylic acids and their derivatives, and can also form salts with halogenated compounds. These reactions are used in coatings for cross-linking Linking or modification has a wide range of uses.
The most commonly used epoxy-containing silane coupling agents are CH-CH-CH: -O-RSi and O-CHCH, S and so on. The epoxy groups in them can be ring-opened by groups with active oxygen such as amines, can also be ring-opened at high temperatures, and can also be copolymerized with polymers with epoxy groups. It has good compatibility in organic materials, so it is often used for coating modification.
In short, the chemical properties of carbon functional groups in silane coupling agents are the same or similar to those of organic compounds. For example, -NCO can react with one OH, one NH and one COOH; one N can generate free radicals, so it can react with polyethylene. Different carbon functional groups in the silane coupling agent can react with the polymer-related groups in the coating to form a covalent bond, because the surface is used in the coating to improve performance.
R group in silane coupling agent
The carbon functional group in the silane coupling agent is connected to the silicon through alkylene and phenylene, so that the coupling agent has hydrolytic stability and thermal stability. The R group in the silane coupling agent is -(CH2), which is relatively stable only when n=1 and n≥3. When the polar group is connected to silicon through two carbon atoms, the β effect is likely to occur, breaking the silicon-carbon bond, montan ester wax paper and its stability as a coupling agent is poor, so it is not often used. When the R group is a phenylene group, this type of silane coupling agent usually increases the heat resistance of the coupling agent with an alkyl group to a carbon functional group by nearly 100°C, so it is better to use it in a high temperature coating.
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