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57results about How to "Increased physical size" patented technology

Anti-mud type phosphate modified polycarboxylate superplasticizer and preparation method thereof

The invention discloses an anti-mud type phosphate modified polycarboxylate superplasticizer and a preparation method thereof. The method specifically comprises the following steps: performing oxidation-reduction free radical polymerization reaction on unsaturated carboxylic acid micro-monomer and unsaturated polyether macro-monomer in the presence of an initiator, a reducing agent and a chain transfer agent, thereby acquiring a carboxyl-containing polycarboxylate superplasticizer prepolymer; with diphenyl phosphoryl chloride, modifying the carboxyl-containing polycarboxylate superplasticizer prepolymer partially, thereby acquiring a phosphate based copolymerization product; after completing the reaction, regulating the pH value to 6-7 and adding water, thereby acquiring the polycarboxylate superplasticizer. According to the invention, the side chain of the polycarboxylate superplasticizer is modified into a phosphate group containing two benzene rings and the phosphoric acid functional group enters into the carminate element of the polycarboxylate superplasticizer, so that the sulfate radical resisting capacity and anti-mud capacity of the polycarboxylate superplasticizer are promoted. The introduction of the benzene rings can greatly increase the physical size of the side chain of the polycarboxylate superplasticizer and the polycarboxylate superplasticizer is unlikely to be inserted into the layered structure of clay, so that the anti-mud effect can be achieved and the intrinsic function of the polycarboxylate superplasticizer is not influenced.
Owner:JIANGSU CHINA RAILWAY ARIT NEW MATEIRALS CO LTD

Slow-release polycarboxylate superplasticizer and preparation method thereof

The invention discloses a slow-release polycarboxylate superplasticizer and a preparation method thereof. The preparation method comprises specific steps as follows: firstly, small unsaturated carboxylic acid monomers and diphenylphosphinyl chloride are subjected to a partial reaction, and small unsaturated monomers containing phosphate ester groups are obtained; then 2-phenylethylamine and phosphate ester groups are added to a reaction system and subjected to a reaction, and small unsaturated monomers containing amide groups are obtained; the small unsaturated monomers containing the amide groups are subjected to an oxidation-reduction free radical polymerization reaction with unsaturated polyether macromonomers under the action of an initiating agent, a reducing agent and a chain transfer agent, and a copolymerization product is obtained; pH value is adjusted to 6-7 after the reaction, water is added, and the polycarboxylate superplasticizer is obtained. The amide groups containing benzene rings are introduced to side chains of the prepared polycarboxylate superplasticizer, so that the dispersibility of the polycarboxylate superplasticizer for cement is improved, the polycarboxylate superplasticizer has good slump retaining performance on the premise of water reduction, and besides, the yield of the polycarboxylate superplasticizer containing the amide groups can reach 94% or higher.
Owner:JIANGSU CHINA RAILWAY ARIT NEW MATEIRALS CO LTD

Compound polycarboxylate superplasticizer and preparation method thereof

The invention provides a compound polycarboxylate superplasticizer and a preparation method thereof. The compound polycarboxylate superplasticizer comprises a polycarboxylate superplasticizer mother solution, wherein the polycarboxylate superplasticizer mother solution is obtained by the steps of mixing a terminal hydroxyl esterifiable polyether macromonomer, water, an initiator, a chain transfer agent and acrylic acid, reacting while heating and neutralizing until the pH value is up to 6-7; and the terminal hydroxyl esterifiable polyether macromonomer is obtained by carrying out esterification reaction on the terminal hydroxyl of a polyether macromonomer and carboxyl of macromolecular carboxylic acid under the catalytic action of a catalyst. The terminal hydroxyl esterifiable polyether macromonomer takes the macromolecular carboxylic acid as a terminal blocking group of the polyether macromonomer, so that the physical size of the tail end of a side chain is greatly increased, then, the physical size of the tail end of the side chain of the polycarboxylate superplasticizer mother solution synthesized and prepared by using the terminal hydroxyl esterifiable polyether macromonomer is greatly increased, the polycarboxylate superplasticizer mother solution is not easily inserted to a laminated structure of clay, and furthermore, a mud-resistant effect is achieved. Then, the polycarboxylate superplasticizer mother solution is compound to form the compound polycarboxylate superplasticizer provided by the invention, so that the working performance of concrete is better ensured.
Owner:甘肃智通云翔交通科技有限公司
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