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Polycarboxylic acid high-performance water reducing agent

A technology of polycarboxylate and water reducer, which is applied in the field of polycarboxylate high-performance water reducer, can solve the problems of poor concrete frost resistance and anti-penetration performance, achieve excellent dispersibility and water reduction, and improve the anti-freezing performance. Frost resistance, improvement of toughening effect

Active Publication Date: 2022-07-01
阿克苏市恒泰新型建材有限公司
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  • Description
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Problems solved by technology

Chinese patent CN103408706A discloses a polycarboxylic acid high-performance water reducer and its preparation method, including the following steps: adding unsaturated polyether macromonomer A and water into the reactor, the unsaturated polyether macromonomer A One or two of TPEG, APEG, HPEG; after stirring evenly to dissolve, add initiator F hydrogen peroxide; then add unsaturated carboxylic acid or unsaturated carboxylic acid anhydride small monomer B, unsaturated carboxylic acid The aqueous solution of ester small monomer C, initiator D, the aqueous solution of initiator E and the aqueous solution of molecular weight regulator, described unsaturated carboxylic acid or unsaturated carboxylic acid anhydride small monomer B is methacrylic acid, acrylic acid, maleic acid One or more combinations of acid anhydride and itaconic acid; react at room temperature to obtain a copolymer product; adjust the pH value of the copolymer product to neutral with sodium hydroxide; the polycarboxylate water reducer prepared by the present invention Environmentally friendly and pollution-free, high reaction conversion rate, good water-reducing, slump-preserving and dispersibility when mixed into concrete, but not good for improving the frost resistance and anti-permeability of concrete

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  • Polycarboxylic acid high-performance water reducing agent

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Effect test

Embodiment 1

[0027] The mother liquor of polycarboxylate water reducing agent is prepared by the following method:

[0028] (1) 100 parts by weight of EPEG are added in 400 parts by weight of water and mixed to obtain EPEG aqueous solution; 0.1 part by weight of sodium methacrylate and 0.2 part by weight of ascorbic acid are added in 30 parts by weight of water and mixed to obtain mixed solution I; 3 Parts by weight of acrylic acid, 1.6 parts by weight of 25wt% hydrogen peroxide, and 0.1 part by weight of mercaptoacetic acid are added to 65 parts by weight of water and mixed evenly to obtain Mixed Solution II;

[0029] (2) Add 5 parts by weight of 4-hydroxybutyl vinyl polyoxyethylene ether to the EPEG aqueous solution and react at 25°C for 20min, then add the above mixed solution I and mixed solution II, keep the reaction at 25°C for 5h, and then add 30wt% hydrogen The sodium oxide aqueous solution was adjusted to pH 7, and it was obtained.

Embodiment 2

[0031] The mother liquor of polycarboxylate water-reducing agent is prepared by the following method:

[0032] (1) 2 parts by weight of itaconic acid, 5 parts by weight of 4-hydroxybutyl vinyl polyoxyethylene ether, 0.01 part by weight of phenothiazine were added to 300 parts by weight of toluene and mixed uniformly, and then 0.21 part by weight of 98% by weight concentrated Sulfuric acid, heated to 100°C for 6 hours, rotary-evaporated to remove toluene, washed and dried to obtain an intermediate product;

[0033] (2) 100 parts by weight of EPEG are added in 400 parts by weight of water and mixed to obtain an EPEG aqueous solution; 0.1 part by weight of sodium methacrylate and 0.2 part by weight of ascorbic acid are added in 30 parts by weight of water and mixed to obtain mixed solution I; 3 Parts by weight of acrylic acid, 1.6 parts by weight of 25wt% hydrogen peroxide, and 0.1 part by weight of mercaptoacetic acid are added to 65 parts by weight of water and mixed evenly to ...

Embodiment 3

[0036] The mother liquor of polycarboxylate water-reducing agent is prepared by the following method:

[0037] (1) 2 parts by weight of itaconic acid, 5 parts by weight of 4-hydroxybutyl vinyl polyoxyethylene ether, 0.01 part by weight of phenothiazine were added to 300 parts by weight of toluene and mixed uniformly, and then 0.21 part by weight of 98% by weight concentrated Sulfuric acid, heated to 100°C for 6 hours, rotary-evaporated to remove toluene, washed and dried to obtain an intermediate product;

[0038] (2) 100 parts by weight of EPEG are added in 400 parts by weight of water and mixed to obtain an EPEG aqueous solution; 0.1 part by weight of sodium methacrylate and 0.2 part by weight of ascorbic acid are added in 30 parts by weight of water and mixed to obtain mixed solution I; 3 Parts by weight of itaconic acid-modified inorganic material, 3 parts by weight of acrylic acid, 1.6 parts by weight of 25wt% hydrogen peroxide, and 0.1 part by weight of mercaptoacetic ac...

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Abstract

The invention discloses a polycarboxylic acid high-performance water reducing agent which is prepared from a polycarboxylic acid water reducing agent mother liquor, a preservative, sodium gluconate, ethylenediamine tetramethylenephosphonic acid, hydroxypropyl methyl cellulose, sodium pyrosulfite, tetradecyl trimethyl ammonium chloride and aluminum sulfate. The polycarboxylic acid high-performance water reducing agent is excellent in dispersity and water reducing property, and can effectively improve the freezing resistance and permeability resistance of concrete after being doped into the concrete.

Description

technical field [0001] The invention belongs to the technical field of admixtures for concrete, and particularly relates to a polycarboxylic acid high-performance water reducer. Background technique [0002] Concrete admixtures generally include fluidity-improving admixtures, setting-hardening admixtures, durability-improving admixtures, and admixtures that improve other properties. Water reducing agent is a commonly used concrete admixture, mainly to reduce the water consumption of cement in the construction process, improve the fluidity of concrete, and prolong the service life of concrete. Water reducing agents can be divided into lignin-based ordinary water-reducing agents, water-soluble resin-based high-efficiency water-reducing agents, and polycarboxylic acid-based high-performance water-reducing agents. Among them, polycarboxylate high-performance water reducing agent not only has high water reducing rate and low dosage, but also has good dispersibility, short settin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F285/00C08F228/02C08F234/02C08F220/06C04B24/26C04B103/30
CPCC08F283/065C08F285/00C04B24/2694C04B2103/302C08F228/02C08F234/02C08F220/06Y02W30/91
Inventor 孙超孙红宾张恒春
Owner 阿克苏市恒泰新型建材有限公司
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