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A kind of preparation method and application of high water-reducing polycarboxylate superplasticizer

A technology of superplasticizer and polycarboxylic acid, which is applied in sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problem of self-polymerization of unsaturated ester monomers and the problem of insufficient increase in the proportion of carboxyl groups. Low cost, reduced dosage, and reduced viscosity

Active Publication Date: 2022-05-31
JIANGSU SOBUTE NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In order to solve this problem, the patent CN104387536B specially reported a method of increasing the proportion of carboxyl groups in polycarboxylic acid products by hydrolysis of unsaturated ester monomers, but this method also has the problem of self-polymerization of unsaturated ester monomers and the increase in the proportion of carboxyl groups still not enough problem

Method used

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  • A kind of preparation method and application of high water-reducing polycarboxylate superplasticizer
  • A kind of preparation method and application of high water-reducing polycarboxylate superplasticizer
  • A kind of preparation method and application of high water-reducing polycarboxylate superplasticizer

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The preparation steps of the high water-reducing type polycarboxylic acid superplasticizer are as follows:

[0052] Synthesis of side chain macromonomer C-1: add 30wt% hydrogen peroxide (0.028mol, 3.18g) and solvent water 50g to a four-necked flask equipped with a stirrer and a thermometer, stir evenly, and control the temperature to be 10°C, At this temperature, dropwise added acrylic acid (1mol, 72g), hydroxyethyl acrylate (1mol, 116g), E-1 (0.2mol, 32.4g), L-ascorbic acid (0.007mol, 1.23g) and water 138g The mixed solution of C-1 was added dropwise for 2h. After the dropwise addition, the temperature was kept for 1h to obtain the aqueous solution of C-1. GPC measured M w is 1020;

[0053] Synthesis of high water-reducing type polycarboxylic acid superplasticizer: to the solution of C-1 synthesized above, add isopentenyl polyoxyethylene ether (M w 1000, 0.4mol, 400g) and 400g of water, stir evenly, and control the temperature to 50°C. The mixed solution composed of...

Embodiment 2

[0055] The preparation steps of the high water-reducing type polycarboxylic acid superplasticizer are as follows:

[0056] Synthesis of side chain macromonomer C-2: add 30wt% hydrogen peroxide (0.0645mol, 7.31g) and solvent water 50g to the four-necked flask equipped with a stirrer and a thermometer, stir evenly, and control the temperature to be 20°C, At this temperature, a mixture of hydroxyethyl acrylate (1 mol, 116 g), acrylic acid (1 mol, 72 g), E-2 (0.15 mol, 24 g), L-ascorbic acid (0.0215 mol, 3.78 g) and 160 g of water was added dropwise. The mixed solution was added dropwise for 1h. After the dropwise addition, the temperature was kept for 1h to obtain an aqueous solution of C-1. GPC measured M w is 1250;

[0057] Synthesis of high water-reducing type polycarboxylate superplasticizer: add vinyl polyoxyethylene ether (M w 2000, 0.5mol, 1000g) and 500g of water, stir evenly, and control the temperature to 40°C. -the mixed solution that ascorbic acid (0.0215mol, 3.78g...

Embodiment 3

[0059] The preparation steps of the high water-reducing type polycarboxylic acid superplasticizer are as follows:

[0060] Synthesis of side chain macromonomer C-3: add 30wt% hydrogen peroxide (0.135mol, 15.3g) and solvent water 50g to a four-necked flask equipped with a stirrer and a thermometer, stir evenly, and control the temperature to be 30°C, At this temperature, hydroxyethyl acrylate (1 mol, 116 g), methacrylic acid (1 mol, 86 g), E-3 (0.135 mol, 25.7 g), L-ascorbic acid (0.00846 mol, 1.49 g) and water were added dropwise The mixed solution composed of 160g was added dropwise for 1h, and kept for 1h after the dropwise addition to obtain an aqueous solution of C-3. GPC measured M wis 1510;

[0061] Synthesis of high water-reducing type polycarboxylic acid superplasticizer: add methallyl polyoxyethylene ether (M w 3000, 0.65mol, 1950g) and water 1000g, stir evenly, control the temperature to 20°C, at this temperature, dropwise add fumaric acid (2.6mol, 301.6g), mercapt...

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Abstract

The invention discloses a preparation method and application of a high water-reducing polycarboxylic acid superplasticizer. In the present invention, the polycarboxylic acid superplasticizer is prepared by free radical copolymerization of the main chain monomer A, the side chain macromonomer B and the side chain macromonomer C in water; the structural formula of the monomer A is R 1 is ‑H or ‑COOH, R 2 for ‑H, ‑CH 3 or-CH 2 COOH, R 3 is ‑OH, ‑NH 2 Or C1~C4 alkyl; the structure of the monomer B is R 5 is ‑O‑, ‑CH 2 O‑,‑CH 2 CH 2 O-or-OCH 2 CH 2 CH 2 CH 2 O-; the monomer C structure is prepared by the present invention using a two-step one-pot method, the process is simple, the production process is green and environmentally friendly, and the cost is low, which is beneficial to large-scale production; the polycarboxylic acid superplasticizer of the present invention is far superior in extreme water reduction Compared with existing products, it can meet the stringent requirements of ultra-high-strength concrete such as high fluidity, long slump time, and reduced viscosity.

Description

technical field [0001] The invention relates to a preparation method of a high water-reducing type polycarboxylic acid superplasticizer and its application as a cement dispersant, belonging to the technical field of admixtures for concrete. Background technique [0002] Polycarboxylate superplasticizers (commonly known as water reducers in China) have become the current market for concrete admixtures due to their low dosage, high water reducing rate, good slump retention, strong molecular structure adjustability, and environmental protection. the most important product. Polycarboxylate superplasticizer is a comb-shaped water-soluble polymer, which consists of a main chain rich in carboxylic acid groups and a side chain of polyoxyethylene ether. The carboxylic acid groups on the main chain of polycarboxylate can be directionally adsorbed on the surface of positively charged cement or cement hydrate, while the side chains of polyoxyethylene ether extend in solution to form a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F220/06C08F220/20C08F222/02C08F220/18C08F220/56C08F220/14C08F220/54C04B24/26C04B103/30
CPCC08F283/065C04B24/2694C04B2103/302C08F220/06C08F220/20C08F222/02C08F220/56C08F220/14C08F220/54Y02W30/91
Inventor 李申桐杨勇舒鑫周栋梁王涛黄振张建纲张倩倩
Owner JIANGSU SOBUTE NEW MATERIALS
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