Multi-functional high-performance reduction material of polycarboxylic acid series and preparation method thereof

Abstract

The invention provides a multi-functional high-performance reduction material of polycarboxylic acid series and a preparation method thereof. The preparation method comprises the steps of raising the temperature of a 2-acrylamido-2-methyl propane sulfonic acid solution to 55-85 DEG C under a nitrogen protection environment, conducting sufficient stirring, dissolving the solution uniformly, dropwise adding a mixed solution of polyethylene glycol monomethyl ether methyl acrylate, acrylic acid, diethylene glycol monobutyl ether maleic anhydride monoester and an initiator solution to the 2-acrylamido-2-methyl propane sulfonic acid solution within 2-4 hours, and obtaining a first-order reaction solution after dropwise adding is completed; leaving the first-order reaction solution being subjected to treatment at the constant temperature of 55-85 DEG C for 1-2 hours, then adding a catalyst, conducting a reaction for 1-2 hours at the temperature of 55-100 DEG C, conducting vacuum filtration for two hours, after the reaction is ended, cooling the mixture to the room temperature, then using an alkali solution for adjusting the pH value to be 7, discharging the material, and obtaining the multi-functional high-performance reduction material of the polycarboxylic acid series. According to the multi-functional high-performance reduction material of the polycarboxylic acid series and the preparation method thereof, the main synthesis raw materials are abundant in source, the synthesis process is simple, and good construction performance, mechanical properties and volume stability are achieved.

Description

technical field

[0001] The invention belongs to the field of building materials, in particular to a multifunctional high-performance polycarboxylate shrinkage-reducing material and a preparation method thereof. Background technique

[0002] In recent years, many experts and scholars at home and abroad have conducted a lot of research and discussion on polycarboxylic acid chemical admixtures, and there are many related reports. There are also many manufacturers that can produce products with relatively stable quality and are widely used in concrete. in the field. The biggest advantages of polycarboxylate chemical admixtures are high water-reducing rate and good slump retention performance. It is considered as the third generation of concrete chemical admixtures in Germany. At present, especially in the promotion and application of high-performance concrete, the shrinkage of concrete and the resulting cracking phenomenon are becoming more and more serious. By adding ordinary ...

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