Allyl polyglycol ether type polycarboxylic acid series dehydragent and preparation method thereof

Abstract

The invention discloses an allyloxypolyethyleneglycol type polycarboxylate water reducing agent and a method for preparing the same, wherein the water reducing agent is a polymer obtained through polymerization; the polymer comprises the following components in weight percentage: 30 to 50 percent of unsaturated polyoxyalkylene group ether monomer(a), 5 to 20 percent of unsaturated monocarboxylic acid and derivative monomer(b) of unsaturated monocarboxylic acid, 1 to 20 percent of unsaturated dicarboxylic acid(c) and 40 to 60 percent of water; the components undergo polymerization in a water solution at a temperature of between 45 and 70 DEG C in the presence of a redox initiator to form the water reducing agent. The polycarboxylate water reducing agent has the advantages of high conversion rate of reaction product, good cohesiveness and super high dispersibility and excellent performance when applied to high strength concrete.

Description

technical field [0001] The invention relates to the field of preparation of chemical raw materials, in particular to an allyl polyglycol ether type polycarboxylate water reducer with super strong dispersing effect and a preparation method thereof. Background technique [0002] In today's concrete industry, it has become a consensus to improve the durability and strength of concrete buildings. It is a common method to use extremely high water-reducing polycarboxylate-based water-reducers to reduce the unit water volume. [0003] Over the years, in order to reduce the unit water volume, polycarboxylate-based water reducers have been replaced, but now it is difficult to meet the increasingly complex requirements for concrete raw materials and workability. In the patent CN128887OA, a method for preparing a polycarboxylate water reducer containing a specific ratio of polyethylene glycol monoallyl ether and maleic acid monomers in an oxidation-reduction system is disclosed, and th...

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Problems solved by technology

CN10118646OA discloses a kind of polycarboxylate water-reducer and its synthetic method with allyl polyethylene glycol as raw material, with allyl polyethylene glycol, maleic anhydride, methyl acrylate, ammonium persulfate, sulfuric acid Stannous and water are synthesized through nitrogen protection and heating reaction. Although this method solves the problem of low copolymerization of polyethylene glycol monoallyl ether and maleic acid monomers, its water reduction rate is still high. Not high enough, selective to concrete composition materials, poor adaptability, still unable to meet the requirements of dispersion performance in the field of high water reducing rate

Patent CN1412175 discloses a preparation method of an allyl ether ester monomer and a method for preparing a water reducer by using the monomer, using the refined allyl ether ester monomer and maleic anhydride at 80°C Azobisisobutyronitrile is used as an initiator to prepare a copolymer with a weight-average molecular weight of 13,500, and then the copolymer is esterified with alkyl polyalkylene glycol at 100°C to obtain a micro-crosslinked cement dispersion agent, so that it has relatively better adaptability to different cements, and the process is more complicated, which makes the cost of the final product very high

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