An air-entraining controllable polycarboxylate water reducer for pure machine-made sand concrete and its preparation method

A polycarboxylic acid-based and concrete technology, applied in the field of concrete admixtures, can solve the problems of large concrete pumping loss, poor bubble stability, poor water retention, etc. The effect of improving the slump performance

Active Publication Date: 2019-11-26
中建商品混凝土(福建)有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims at the deficiencies in the prior art, and aims to provide an air-entraining controllable polycarboxylate water reducer for pure machine-made sand concrete and its preparation method, so as to solve the problem of air-entraining in pure machine-made sand concrete. Difficulty, poor water retention, poor bubble stability, and large concrete pumping losses

Method used

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  • An air-entraining controllable polycarboxylate water reducer for pure machine-made sand concrete and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] An air-entraining controllable polycarboxylate water-reducing agent for pure machine-made sand concrete is prepared by the following method:

[0033] (1) The octylphenol polyoxyethylene ether monomer (CH 3 (CH 2 ) x C 6 H 4 (OC 2 H 4 ) y OH x = 8, y = 7) was added to the flask, heated to 110 ~ 120 ℃, nitrogen under the liquid, stirred uniformly, and then added acrylic monomer (octyl phenol polyoxyethylene ether monomer and acrylic monomer The molar ratio is 1:1.1), oleum (accounting for 1% of the total amount of two monomers), phenothiazine (accounting for 0.02% of the total amount of two monomers) and hydroquinone (accounting for the total amount of two monomers) 0.02%), the temperature is controlled at 110~120℃, react for 4~6 hours, after the temperature is reduced to 80~85℃, add sodium hydroxide solution while stirring to neutralize to pH=6.5~7, obtain unsaturated carboxylic acid- Alkylphenol polyoxyethylene ether ester monomer, ready for use after cooling down;

[0034]...

Embodiment 2

[0038] An air-entraining controllable polycarboxylate water-reducing agent for pure machine-made sand concrete is prepared by the following method:

[0039] (1) The nonylphenol polyoxyethylene ether monomer (CH 3 (CH 2 ) x C 6 H 4 (OC 2 H 4 ) y OH x = 8, y = 11) was added to the flask, heated to 110 ~ 120 ℃, nitrogen under the liquid, stirred uniformly, and then added methacrylic acid monomer (nonylphenol polyoxyethylene ether monomer and methyl The molar ratio of acrylic monomer is 1:1.2), fuming sulfuric acid (accounting for 2% of the total amount of two monomers), phenothiazine (accounting for 0.05% of the total amount of monomers) and hydroquinone (accounting for the total amount of monomers 0.05%), the temperature is controlled at 110~120℃, react for 4~6 hours, when the temperature is reduced to 80~85℃, add sodium hydroxide solution while stirring to neutralize to pH=6.5~7, obtain unsaturated carboxylic acid- Alkylphenol polyoxyethylene ether ester monomer, ready for use aft...

Embodiment 3

[0044] An air-entraining controllable polycarboxylate water-reducing agent for pure machine-made sand concrete is prepared by the following method:

[0045] (1) The nonylphenol polyoxyethylene ether monomer (CH 3 (CH 2 ) x C 6 H 4 (OC 2 H 4 ) y OH x=8, y=9) Put it into the flask, raise the temperature to 110~120℃, pour nitrogen under the liquid, stir it evenly, and then add acrylic monomer (nonylphenol polyoxyethylene ether monomer and acrylic monomer The molar ratio is 1:1.15), oleum (accounting for 1.5% of the total amount of two monomers), phenothiazine (accounting for 0.04% of the total amount of two monomers) and hydroquinone (accounting for the total amount of two monomers) 0.04%), the temperature is controlled at 110~120℃, react for 4~6 hours, after the temperature is reduced to 80~85℃, add sodium hydroxide solution while stirring to neutralize to pH=6.5~7, to obtain unsaturated carboxylic acid- Alkylphenol polyoxyethylene ether ester monomer, ready for use after cooling d...

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Abstract

The invention belongs to the field of concrete additives, and concretely relates to an air entrainment-controllable polycarboxylic water reducer used for purely machine-made sand concrete, and a preparation method thereof. The preparation method comprises the following steps: carrying out an esterification reaction on an alkylphenol polyoxyethylene monomer and an unsaturated carboxylic acid to generate an unsaturated carboxylic acid-alkylphenol polyoxyethylene esterification product monomer, carrying out an aqueous solution copolymerization reaction on the unsaturated carboxylic acid-alkylphenol polyoxyethylene esterification product monomer, an unsaturated polyether monomer and an unsaturated sulfonic acid monomer through an oxidation-reduction initiation system, and adding a proper amount of a molecular weight control agent to control the molecular weight in order to obtain the air entrainment-controllable polycarboxylic water reducer. The water reducer prepared in the invention has the advantages of high water reduction rate, good adaptability, small bubble diameters, stable sealing property and controllable air entrainment when applied to the purely machine-made sand concrete, and well solves the problems of difficult air entrainment, poor bubble stability and large concrete pumping loss of the purely machine-made sand concrete.

Description

Technical field [0001] The invention belongs to the field of concrete admixtures, and in particular relates to an air-entraining controllable polycarboxylic acid water-reducing agent for pure machine-made sand concrete and a preparation method thereof. Background technique [0002] Polycarboxylic acid water reducer has the advantages of strong designability of molecular structure, simple production process, high water reduction rate, good slump retention performance, strong adaptability to other materials, and green and pollution-free production process, so it is used in construction engineering. It has been widely used and replaced the traditional naphthalene-based water-reducing agent to become the most used admixture in engineering, the highest technical content, and the most significant economic and environmental benefits. As a surface active agent, polycarboxylic acid water-reducing agent has certain air-entraining performance. However, due to the large size of the bubbles i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F220/06C08F228/02C08F212/14C04B24/16C04B103/30
CPCC04B24/165C04B2103/302C08F283/065C08F220/06C08F228/02C08F212/14
Inventor 张恒春吕振华季锡贤纪晓辉唐方宇马路张超关涌
Owner 中建商品混凝土(福建)有限公司
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