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55 results about "Benzisothiazolone" patented technology

Early-strength polycarboxylate superplasticizer and preparation method thereof

The invention relates to the field of water reducing agents, and discloses an early-strength polycarboxylate superplasticizer and a preparation method thereof. The early-strength polycarboxylate superplasticizer is prepared from 10 to 15 parts of methylallylpolyoxyethylene ether, 25-30 parts of acrylic acid, 2-3 parts of sodium sulfonate methacrylate, 1-2 parts of an initiator, 4-5 parts of 1,2-benzisothiazole-3-one, 0.4-0.5 part of nanometer gallium oxide, 0.6-0.8 part of a solvent, and 50-60 parts of water. The preparation method comprises the following steps: mixing nanometer gallium oxide and a solvent, adding 1,2-benzisothiazole-3-one, and adding the mixture into a polycarboxylic acid polymer synthesized by other components to obtain the polycarboxylate superplasticizer. The preparation method has the advantages that the nanometer gallium oxide contains a microcosmic porous structure and can be better blended with 1,2-benzisothiazole-3-one after being mixed with a solvent, so a product adsorbing free carboxyl groups is obtained, the content of the free carboxyl groups capable of being complexed with calcium ions in a liquid phase is reduced, hydration is accelerated, coagulation time is shortened, water consumption is reduced, water film layers are decreased, and aggregate-cement interface structure is changed, so the early strength of concrete is better improved.
Owner:唐山冀东水泥外加剂有限责任公司 +1

Bactericidal diol chain extender, preparation method thereof and application of bactericidal diol chain extender in multifunctional synergistic anti-fouling waterborne polyurethane

The invention provides a bactericidal diol chain extender. The structural formula of the chain extender is shown in the specification. The chain extender is prepared by the following steps: dissolving dibromo-octyl pentanediol and 1,2-benzisothiazole-3-ketone in a solvent, putting into a microwave reactor, reacting at 22222 DEG C for 2212 hours, and purifying to obtain the diol chain extender containing bactericidal groups, wherein the molar ratio of the dibromo-octyl pentanediol to the 1,2-benzisothiazole-3-ketone is 1.2 to 2.222.5. The invention also provides an application of the diol chain extender in multifunctional synergistic anti-fouling waterborne polyurethane. The bactericidal diol chain extender is applied to preparation of anti-fouling waterborne polyurethane, bactericidal groups are introduced into a coating through covalent bonds, compared with a release type anti-fouling coating, the environmental toxicity can be effectively reduced, and the prepared anti-fouling waterborne polyurethane can be widely applied to textile, plastic, medical treatment and public health and the like, especially the marine anti-fouling field; and on the other hand, the environment is not polluted, the production cost of the product can be reduced, and energy is saved.
Owner:GUANGZHOU MARITIME INST
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