Ester anticorrosive polycarboxylate superplasticizer and preparation method thereof

Abstract

The invention relates to the technical field of building materials, in particular to an ester anticorrosive polycarboxylate superplasticizer and a preparation method thereof. The ester anticorrosive polycarboxylate superplasticizer is prepared by carrying out polymerization reaction on an anticorrosive functional small monomer, an unsaturated ester macromonomer, unsaturated carboxylic acid and/or unsaturated carboxylic acid anhydride under the action of an initiator and a molecular weight regulator. The generated ester anticorrosive polycarboxylate superplasticizer has a molecular main chain linked with the anticorrosive functional small monomer. The ester anticorrosive polycarboxylate superplasticizer provided by the invention is an ester superplasticizer with an anticorrosive effect, has good anticorrosive and water-reducing effects, has better workability and lower sensitivity than ether polycarboxylate superplasticizers when being used for concrete. The finally obtained ester anticorrosive polycarboxylate superplasticizer product has a stable macromolecular structure, can tolerate a high temperature of 50 DEG C or more, has more excellent high-temperature corrosion resistance, has the advantages of wide sources of used raw materials, lower price and simple preparation technique, and has important practical application value.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to an ester anti-corrosion polycarboxylate water reducer and a preparation method thereof. Background technique [0002] With the development and progress of modern science and technology, the scale of basic engineering construction is expanding day by day, and modern construction projects are developing towards high-rise, super high-rise, and long-span frame projects. The demand for concrete is increasing, and the pumping of concrete, anti-segregation, etc. Performance requirements are getting higher and higher. [0003] In concrete materials, admixtures, such as water reducers, are often used. At present, polycarboxylate superplasticizers 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. At present, the conventional sol...

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Problems solved by technology

[0007] 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 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. When the water content is high, it may even exceed 90%, so the effect of directly compounding and adding dimethyl fumarate is not ideal

[0008] 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

[0009] 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 complicated and the energy consumption is high

[0010] 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

[0011] 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

[0012] 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 of this patent only has anti-corrosion effect, and does not have the effect of reducing water, and the direct polymerization of dimethyl fumarate monomer and unsaturated monomer system has poor water solubility and phase separation during the polymerization process The problem that makes the aggregation efficiency low

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