Novel anti-mud slump-retaining nano polycarboxylic acid water reducer and preparation method thereof

A technology of polycarboxylic acid and water reducing agent, applied in the field of new anti-slump-preserving nano-polycarboxylate water reducing agent and its preparation field, can solve unsatisfactory effects and mechanisms, difficult large-scale production and application, and unstable effects and other problems, to achieve and lasting anti-mud effect, strong anti-mud effect, high slump protection effect

Active Publication Date: 2021-05-07
RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The anti-mud admixture prepared by the prior art is not satisfactory in terms of effect and mechanism for solving the problem of high mud content, a

Method used

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  • Novel anti-mud slump-retaining nano polycarboxylic acid water reducer and preparation method thereof
  • Novel anti-mud slump-retaining nano polycarboxylic acid water reducer and preparation method thereof
  • Novel anti-mud slump-retaining nano polycarboxylic acid water reducer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: A novel anti-sludge nano polycarboxylate superplasticizer, its preparation method is as follows

[0022] (1) Preparation of anti-mud crosslinking agent A: 24g of polyoxyethylene glycol with a molecular weight of 600, 15g of acrylic anhydride, 0.3g of hydroquinone and 0.6g of p-toluenesulfonic acid were added to the reaction containing 70g of pyridine Stir and dissolve in the bottle, after the dissolution is complete, raise the temperature to 50°C under the protection of nitrogen to carry out the esterification reaction for 6 hours, and obtain the anti-mud crosslinking agent A through dialysis separation after the reaction;

[0023](2) Polymerization reaction: Add 2g of polymerizable anti-sludge emulsifier and 120g of water into the reaction vessel, start stirring to dissolve the emulsifier, and then mix the mixture of small monomers and chain transfer agents (containing 10g of acrylic acid, hydroxypropyl acrylate 10g, 40g of butyl acrylate, 20g of styrene,...

Embodiment 2

[0024] Embodiment 2: A novel anti-sludge nano polycarboxylate superplasticizer, its preparation method is as follows

[0025] (1) Preparation of anti-mud crosslinking agent B: 40g of polyoxypropylene diol with a molecular weight of 1000, 12g of maleic anhydride, 0.5g of phenothiazine and 1g of benzenesulfonic acid were added to 80g of N,N-dimethyl Stir and dissolve the formamide in the reaction flask. After the dissolution is complete, raise the temperature to 45°C under the protection of nitrogen to carry out the esterification reaction for 8 hours. After the reaction is completed, the anti-mud crosslinking agent B is obtained through dialysis separation;

[0026] (2) Polymerization reaction: Add 1.8g of polymerizable anti-sludge emulsifier and 120g of water into the reaction vessel, start stirring to dissolve the emulsifier, and then mix the mixture of small monomers and chain transfer agents (containing 4g of methacrylic acid, acrylic acid Add 12g of hydroxyethyl ester, 30g...

Embodiment 3

[0027] Embodiment 3: A kind of novel anti-sludge nano polycarboxylate superplasticizer, its preparation method is as follows

[0028] (1) Preparation of anti-mud crosslinking agent B: same as step (1) of Example 2;

[0029] (2) Polymerization reaction: Add 1.8g of polymerizable anti-sludge emulsifier and 120g of water into the reaction vessel, start stirring to dissolve the emulsifier, and then mix the mixture of small monomers and chain transfer agents (containing 4g of methacrylic acid, acrylic acid Add 12g of hydroxyethyl ester, 30g of methyl methacrylate, 30g of p-chloromethylstyrene, 2g of mercaptopropionic acid) into the solution, stir to make it fully emulsified, then add 1.5g of potassium persulfate, and raise the temperature of the reaction system to 80°C, after the reaction liquid showed a light blue emulsion, the remaining small monomer and chain transfer agent mixture and polyether macromonomer solution (containing 100g of isobutylene alcohol polyethylene glycol et...

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Abstract

The invention discloses a preparation method of a novel anti-mud slump-retaining nano polycarboxylic acid water reducer. The novel anti-mud slump-retaining nano polycarboxylic acid water reducer is prepared by the following steps: (1) preparing an anti-mud cross-linking agent; and (2) performing polymerization reaction. The novel anti-mud slump-retaining nano polycarboxylic acid water reducer with a cross-linked structure is obtained by carrying out emulsion polymerization on a sulfonate polymerizable emulsifier, a polyether polyol anti-mud cross-linking agent and a monomer. Through cross-linking hardening of the nano-micelle structure, the dispersity of the water reducer can be improved, and the effects of thickening, viscosity reduction, effective mud resistance and concrete workability improvement are achieved. As the nano polycarboxylate superplasticizer is gradually hydrolyzed in cement paste, micelles are cracked through fracture of a cross-linked structure and change of hydrophilicity and hydrophobicity, and various anti-mud small molecules and linear polycarboxylic acid molecules can be released, so that the nano polycarboxylate superplasticizer has long-term anti-mud slump retaining effects. The water reducer can also be used as a regulator in machine-made sand concrete.

Description

technical field [0001] The invention belongs to the field of macromolecule materials, and in particular relates to a novel mud-resistance and slump-preserving nanometer polycarboxylate water reducer and a preparation method thereof. The product can be used in the construction of high-mud or inferior machine-made sand aggregate concrete. Background technique [0002] With the development of today's society and the rapid increase in the demand for engineering construction in all aspects, concrete, as one of the most important construction engineering materials, its preparation technology and performance are also constantly developing. The current construction requirements have high requirements on the fluidity and retention capacity of concrete. The mineral admixtures and functional admixtures used in large quantities in high-performance concrete also make fluidity and long-term maintenance more difficult. In addition, due to my country's vast territory, obvious changes in tem...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C08F220/20C08F220/18C08F212/08C08F220/14C08F212/14C08F222/02C08F212/12C04B103/30
CPCC08F283/065C04B24/2694C04B2103/30C08F220/06C08F220/20C08F220/1804C08F212/08C08F220/14C08F212/18C08F222/02C08F212/12Y02W30/91
Inventor 关文勋程冠之董全霄谢永江夏思盟谭盐宾翁智财冯仲伟李享涛刘子科李书明李世达谢清清李旺曹继涛栗少清舒双炉
Owner RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI
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