1, Low toxicity and broad spectrum of various gram-positive or negative bacteria, mold have strong inhibitory power, long sterilization time.
2, Both inhibition role.
3, Has a strong formula compatibility, long duration of action, small odor, small skin on the operator, etc.
4, Used in paper industry weak alkaline, alkaline operating environment, no corrosion of equipment.
5, It can reduce fiber degradation and improve paper strength.
Main chemical reaction
The main chemical reaction of silicon functional group in silane coupling agent
(1) Hydrolysis reaction
=SiX+H: O—Si OH-HX
X=Cl, -OAc, -OCH, -CHg C Hz OCH, -O CgH, etc. The hydrolysis reaction is accelerated under the catalysis of acid and base, X is different, and the hydrolysis speed is in the following order:
-CC>-OAe>>-OMe>-OCH gCH, OCH, >-OCz Hs
The rate of hydrolysis also slows down due to the number of silicon functional groups:
The silicon functional group of the silane coupling agent can undergo two types of polycondensation reactions.
The silanic hydroxyl group after hydrolysis of the silane coupling agent=Si-OH can be condensed in white or with the hydroxyl group in the coating polymer and the hydroxyl group on the substrate to form =Si-O-Si=, the heterofunctional group in the coupling agent condenses (Heteropolycondensation). The =Si-OH generated by the hydrolysis of the silane coupling agent can be condensed with the unhydrolyzed silicon functional montan ester wax ingredients groups of different molecules, and the unhydrolyzed silicon functional groups can be condensed with the hydroxyl group of the substrate.
The condensation reaction is also accelerated by acids, bases, or heavy metal salts such as Sn, Ti, Pb, Fe, etc., oxides, or their organic compounds. The above condensation reaction causes the silane coupling agent to chemically bond with the substrate, filler, etc. or form a network in the coating.
The main chemical reactions of carbon functional groups in silane coupling agents
Silane coupling agents containing unsaturated groups usually include CH-CH-Si=, C Hz-CH-(CH), -Si=, CH, -CH-CH: Si=, C Hz-CMeC(O) O (CH). One Si = etc. The vinyl groups in this type of silane coupling agent can be self-polymerized, can also be grafted with coating polymers, and can also be copolymerized with some added active vinyl monomers, so that these high-molecular polymers can be cross-linked and the substrate and the Adhesion of coating resins or fillers.
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