Preparation method of polyester type pure solid polycarboxylic acid high-performance water reducing agent
A pure solid, polycarboxylic acid technology, applied in the field of polycarboxylate high-performance water reducers, can solve the problems of inability to fully realize solid polyester type water reducers, enrich the preparation methods of synthetic polycarboxylates, etc., and achieve good market competition force and application prospects, avoiding the reduction of separation and concentration efficiency, and reducing the effect of transportation costs
Active Publication Date: 2013-04-03
BEIJING UNIV OF TECH
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The invention discloses a preparation method of a polyester type pure solid polycarboxylic acid high-performance water reducing agent, belonging to the field of water reducing agents. According to the invention, by taking a (methyl) acrylic acid monomer and a polyethylene glycol compound as reactants, a polymerizable macromonomer is prepared through esterification reaction under the effect of a catalyst, and the polymerizable macromonomer conducts a free radical bulk polymerization reaction with an unsaturated carboxylic acid monomer and a chain transfer agent under the effect of an initiator in an environment without any solvent to obtain the polyester type pure solid polycarboxylic acid high-performance water reducing agent. The method disclosed by the invention has strong process controllability, high degree of polymerization and low cost and prevents environmental pollution; a completely anhydrous polyester type pure solid polycarboxylic acid high-performance water reducing agent is prepared through esterification reaction and bulk polymerization, which has neat cement paste liquidity and holding ability, cement adaptability and concrete application performance similar to a traditional solution method; meanwhile, since the polymer product is an anhydrous pure solid, a solution with any concentration can be prepared according to actual needs; and without the after-treatment processes such as heating and drying, solvent separation and the like, the transportation is more convenient, and good market competitiveness and application prospects are realized.
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