Polycarboxylate superplasticizer and preparation method thereof

Abstract

The invention discloses a polycarboxylate superplasticizer and a preparation method thereof. The polycarboxylate superplasticizer is characterized by being prepared from, by weight, 200 parts of isopentenyl polyoxyethylene ether, 20-80 parts of an unsaturated air-entraining type functional monomer, 12-50 parts of an unsaturated monomer, 0.5-3.0 parts of an initiator, 0.5-2.0 parts of a chain transfer agent, 0.1-1.0 part of a reducing agent; and 300-400 parts of water; wherein the unsaturated air-entraining type functional monomer comprises pimaric acid type resin acid, p-aminophenol, ethanol and a catalyst in a mass ratio of 100: (30-50): 200: (0.1-0.5). The polycarboxylate superplasticizer disclosed by the invention is obtained by free radical copolymerization of the components, and the unsaturated air-entraining functional monomer is introduced into the polycarboxylate superplasticizer, so that the air-entraining function of the polycarboxylate superplasticizer can be effectively improved, the workability of concrete is good, tiny, uniform and stable bubbles are introduced into the concrete, and thus, the permeability resistance and the cracking resistance of the concrete doped with the polycarboxylate superplasticizer are improved.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a polycarboxylate water reducer and a preparation method thereof. Background technique [0002] The key to improving the durability of concrete is to improve the permeability and crack resistance of concrete. One of the effective means to improve the anti-permeability and anti-cracking performance of concrete is to introduce a large number of tiny, uniform, closed and stable air bubbles into the concrete to improve the hardened pore structure of the concrete. [0003] The traditional air-entraining method is: compounding water reducer and air-entraining agent during concrete mixing, or modifying water reducer with calcium lignosulfonate with air-entraining function. In the compounding process of water-entraining agent and air-entraining agent, the problem of incompatibility of air-entraining agent and water-entraining agent usually occurs, which reduces the use effic...

AI Technical Summary

Problems solved by technology

In the compounding process of water-entraining agent and air-entraining agent, the problem of incompatibility of air-entraining agent and water-entraining agent usually occurs, which reduces the use efficiency of air-entraining agent and water-entraining agent, resulting in delamination of the prepared concrete, affecting The strength of concrete, and even engineering accidents; and for the calcium lignosulfonate modified water reducer, because the water reducing performance of the calcium lignosulfonate modified water reducer is low, so when the lignosulfonate in the concrete When the amount of calcium acid modified water reducer is too large, it is easy to cause excessive retardation and large air bubbles in the concrete, resulting in a decrease in the strength and crack resistance of the concrete

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