Anticorrosive polycarboxylic acid slump retaining agent and preparation method thereof

Abstract

The invention relates to the technical field of building materials, in particular to an anticorrosive polycarboxylic acid slump retaining agent and a preparation method thereof. The anticorrosive polycarboxylic acid slump retaining agent is prepared by carrying out polymerization reaction on an anti-corrosion functional small monomer, an unsaturated macromonomer, unsaturated carboxylic acid and / or unsaturated carboxylic acid anhydride and a slow-release slump retaining small monomer under the action of an initiator and a molecular weight regulator. The anticorrosive polycarboxylic acid slump retaining agent has a molecular main chain linked with a small monomer with an anticorrosion function. The anticorrosive polycarboxylic acid slump retaining agent product provided by the invention is a slump retaining agent with an anti-corrosion effect, has excellent anti-corrosion and slump retaining effects, has a stable macromolecular structure, can tolerate a high temperature of 50 DEG C or more. The high-temperature corrosion resistance is more excellent, the used raw materials are wide in source and low in price, the preparation process is simple, and important practical application value is achieved.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to an anti-corrosion polycarboxylic acid slump-retaining agent and a preparation method thereof. Background technique [0002] At present, polycarboxylate slump-retaining agents often have mildew and odor problems during the application process. Although they have little effect on the application performance of concrete, they have brought inconvenience to the application unit. The solution to the mildew and odor problems of water formulations is to compound preservatives, and some people have studied antiseptic polycarboxylate slump retaining agents. [0003] The method of compounding and adding preservatives is the most widely used method at present, but the compounded preservatives generally have a small molecular weight. On the one hand, there may be problems of uneven dispersion in polycarboxylate superplasticizers. On the other hand, the conventional The compound pr...

AI Technical Summary

Problems solved by technology

[0006] CN110015857A, published on July 16, 2019, discloses a preparation method and application of a straw-starch-based mixed polycarboxylate water-reducer, using dimethyl fumarate as a preservative directly It is compounded into patented products, but the water solubility of dimethyl fumarate is not very good. In the actual use of polycarboxylate superplasticizers, it is generally necessary to compound and add a large amount of water, and the water content often exceeds 90%. , so the effect of directly compounding and adding dimethyl fumarate is not ideal

[0007] CN109796561A, published on May 24, 2019, discloses a mother liquid of aromatic ring polycarboxylic acid water reducer and its preparation method and application, using aryl conjugated unsaturated carboxylic acid as anti-corrosion monomer to prepare Polycarboxylate superplasticizer with anti-corrosion effect, but there are problems of large steric hindrance and unsatisfactory polymerization effect when aryl conjugated unsaturated carboxylic acid is polymerized, which will eventually affect the performance of the product

[0008] CN109400819A, published on March 1, 2019, discloses a viscosity-reducing and antibacterial amphoteric polycarboxylate superplasticizer and its preparation method, using guanidine hydrochloride and alkyl compounds with amino groups at both ends to prepare antibacterial Monomer, and then used in the synthesis of polycarboxylate superplasticizer, the synthesis process is complex and energy-intensive

[0009] CN108373526A, published on August 7, 2018, discloses an antifouling and antibacterial polycarboxylate water reducer and its preparation method, by adding (meth)acrylic acid sulfobetaine and methacrylic acid during polymerization Acyloxyethyltrimethylammonium chloride, to achieve antibacterial effect, but the cost of these two monomers is relatively high

[0010] CN107698721A, published on February 16, 2018, discloses a branched antibacterial polycarboxylate water reducer, its preparation method and application, but the preparation process is too complicated and the production efficiency is low

[0011] CN107265907A, published on October 20, 2017, discloses an amphoteric antibacterial polycarboxylate high-efficiency water reducer and its preparation method, through first copolymerization and then with unsaturated polyester macromonomer, halogen-terminated polyether Sequential reaction, the process is more complicated, and because of the reaction between large molecular weight and macromolecules, the product conversion rate will be limited, affecting product performance

However, the product prepared by this patent only has anti-corrosion effect and does not have slump-preserving effect, and the direct polymerization of dimethyl fumarate monomer and unsaturated monomer has poor water solubility and phase separation during the polymerization process. The problem that makes the aggregation efficiency low

Images