Starch-based polycarboxylate superplasticizer partner and preparation method thereof

Abstract

The invention relates to the technical field of concrete admixtures, in particular to a starch-based polycarboxylate superplasticizer partner and a preparation method thereof, and the starch-based polycarboxylate superplasticizer partner comprises the following materials: 20-50 parts of modified starch, 5-20 parts of polyvinyl alcohol monomethyl ether, 5-20 parts of methacrylic acid, 80-100 parts of weakly alkaline deionized water, 5-10 parts of an initiator, 10-15 parts of an esterifying agent, 10-12 parts of modified attapulgite, 5-10 parts of a defoaming agent and 10-15 parts of acetic acid. By adding the polyvinyl alcohol monomethyl ether and the methacrylic acid, the problems of sensitivity and adaptability of the polycarboxylate superplasticizer in the mixing amount are solved, the working states such as workability and cohesiveness of concrete are improved, and the working efficiency of concrete pouring and the quality of hardened concrete are improved, and the starch-based polycarboxylate superplasticizer partner has excellent adaptability to different cement, admixtures, artificial sand, environment temperature and concrete mix proportion fluctuation.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a starch-based polycarboxylate superplasticizer companion and a preparation method thereof. Background technique [0002] At present, the high-efficiency concrete water reducers such as polycarboxylate, naphthalene, aliphatic, and sulfamate commonly used in engineering are all prepared from chemical raw materials obtained from petrochemical and coal chemical industries, and have the characteristics of high emissions and high energy consumption. Starch is a renewable resource of biomass, which is very abundant in nature, has the advantages of complete degradability, no pollution to the environment, and low price. Under the pressure of decreasing petrochemical resources and rapidly rising cost of petrochemical raw materials, effective use of starch to prepare concrete admixtures has broad prospects for development. [0003] With the strengthening of environmental prote...

AI Technical Summary

Problems solved by technology

[0003] With the strengthening of environmental protection in my country, the exploitation of natural resources for concrete is limited, and materials such as machine-made sand, tailings sand, recycled aggregates, and artificial composite admixtures are used in large quantities. Due to factors such as changes in material properties, poor gradation, and quality fluctuations, and The reason for the strong polarity of polycarboxylate superplasticizer monomers is that the dosage of polycarboxylate superplasticizers is sensitive, and the encapsulation of freshly mixed concrete paste is poor, and problems such as segregation, bleeding, bottom grabbing, and pump blockage are prone to occur. Concrete Poor ease and workability