Novel anti-mud polyether type polycarboxylate superplasticizer and normal-temperature synthesis process thereof

Abstract

The invention discloses ananti-mud type polycarboxylate superplasticizer and a normal-temperature synthesis process thereof. The anti-mud type polycarboxylate superplasticizer is prepared from0.4-1.6parts of a reducing agent, 0.9-3.8 parts of a chain transfer agent, 29-35 parts of a functional monomer, 240 parts of an unsaturated polyoxyethylene ether VPEG, 230-240 parts of softened water and 2-3parts of an oxidant. The anti-mud type polycarboxylate superplasticizer is prepared from the unsaturated polyoxyethylene ether VPEG, an unsaturated monobasic acid and a derivative monomer thereof, unsaturated sulfonate and a derivative thereof, an amide group-containing functional monomer and a derivative thereof, a phosphate type functional monomer and a derivative thereof, the oxidant and the reducing agent through polymerization. The invention confirms the normal-temperature synthesis process of the anti-mud type polycarboxylate superplasticizer. On one hand, the production cycle is greatly shortened, continuous periodic production is achieved, the economic cost is lowered, the energy consumption is reduced, and on the other hand, the polycarboxylate superplasticizer has good dispersibility and anti-mud properties.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures in building materials, and in particular relates to a novel mud-resistant polyether polycarboxylate water reducer and its synthesis process at normal temperature. Background technique [0002] At present, most of the mud-resistant polycarboxylate high-performance water reducers are synthesized using HPPEG and TPEG polyether monomers, and functional monomers are used to synthesize mud-resistant functional water reducers. For example, patents CN110028632A and CN109776742A use existing polyether monomers to produce synthetic mud-resistant polycarboxylate superplasticizers at a relatively high temperature, both above 58°C, with a reaction time period of 3h-4h, and a relatively single product structure , the production application and adaptability are not wide enough; and the patent CN107652376B uses chlorine-containing compounds to prepare mud-resistant polycarboxylate superplasticizers, a...

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Problems solved by technology

For example, patents CN110028632A and CN109776742A use existing polyether monomers to produce synthetic mud-resistant polycarboxylate superplasticizers at a relatively high temperature, both above 58°C, with a reaction time period of 3h-4h, and a relatively single product structure. , the production application and adaptability are not wide enough; and the patent CN107652376B uses chlorine-containing compounds to prepare mud-resistant polycarboxylate water reducers, and requires the preparation of intermediates, and the process is complicated

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