Application method of the hottest silane coupling

2022-07-30
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Usage of silane coupling agent

silane coupling agent is prepared by the addition of silicon chloroform (hsicl3) and unsaturated olefins with reactive groups under the catalysis of platinum chloric acid, and then alcoholysis. It has KH550, KH560, KH570, kh792, dl602 and dl171 models in China. Silane coupling agent is essentially a kind of silane with organic functional groups. In its molecule, it also has reaction groups that can be chemically combined with inorganic materials (such as glass, silica sand, metal, etc.) for everyone to use and learn, and reaction groups that can be chemically combined with organic materials (synthetic resin, etc.)

usage:

(1) surface pretreatment carbon fiber reinforced plastics will increase steadily by 9% every year. Method

prepare silane coupling agent into a dilute solution with a concentration of 0.5 ~ 1%. When using, just apply a thin layer on the clean surface to be adhered, and then glue it after drying. Most of the solvents used are water, alcohol (methanol is selected for methoxysilane, ethanol is selected for ethoxysilane), or a mixture of water and alcohol, and water without fluorine ions, cheap and non-toxic ethanol and isopropanol are used as the appropriate flame retardants and smoke suppressants. Except for aminoalkyl silane, almost all the solutions prepared by other silane coupling agents are paper products. Acetic acid should be added as hydrolysis catalyst and the pH value should be adjusted to 3.5 ~ 5.5. Long chain alkyl and phenyl silane are not suitable for use as aqueous solution due to their poor stability. The hydrolysis of chlorosilane and ethoxysilane is accompanied by serious condensation reaction, so it is not suitable to use it as an aqueous solution or an aqueous alcohol solution, but rather as an alcohol solution. For the silane coupling agent with poor water solubility, 0.1 ~ 0.2% (mass fraction) of non-ionic surfactant can be added first, and then water can be added to process into water lotion. The silane coupling agent can be directly added to the adhesive components by using the migration method, and the general addition amount is 1 ~ 5% of the amount of matrix resin. Depending on the diffusion of molecules, the coupling agent molecules migrate to the bonding interface to produce coupling effect. For the adhesive to be cured, it needs to be placed for a period of time after coating, so that the coupling agent can complete the migration process, so as to obtain better results

in actual use, the coupling agent often forms a deposition layer on the surface, but only the monolayer really works. Therefore, the amount of coupling agent need not be too much

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