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Air entrainment-controllable polycarboxylic water reducer used for purely machine-made sand concrete, and preparation method thereof

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: 2017-05-31
中建商品混凝土(福建)有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Air entrainment-controllable polycarboxylic water reducer used for purely machine-made sand concrete, and preparation method thereof

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Effect test

Embodiment 1

[0032] An air-entraining controllable polycarboxylate water reducer 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 into the flask, the temperature was raised to 110-120°C, nitrogen was passed through the liquid, and the acrylic acid monomer (octylphenol polyoxyethylene ether monomer and acrylic acid monomer) was added into the flask The molar ratio is 1:1.1), oleum (accounting for 1% of the total amount of the two monomers), phenothiazine (accounting for 0.02% of the total amount of the two monomers) and hydroquinone (accounting for the total amount of the two monomers 0.02%), the temperature was controlled at 110-120°C, and the reaction was carried out for 4-6 hours. After the temperature was lowered to 80-85°C, sodium hydroxide solution was added while stirring to neutralize to pH=6.5-7, and the unsaturated carboxylic acid- ...

Embodiment 2

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

[0039] (1) 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 into the flask, the temperature was raised to 110-120°C, nitrogen was passed through the liquid, stirred evenly, and then methacrylic acid monomer (nonylphenol polyoxyethylene ether monomer and methyl The molar ratio of acrylic acid monomer is 1:1.2), oleum (accounting for 2% of the total amount of the 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 was controlled at 110-120°C, and the reaction was carried out for 4-6 hours. After the temperature was lowered to 80-85°C, sodium hydroxide solution was added while stirring to neutralize to pH=6.5-7 to obtain unsaturated carboxylic acid- Alkylphenol po...

Embodiment 3

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

[0045] (1) Nonylphenol polyoxyethylene ether monomer (CH 3 (CH 2 ) x C 6 h 4 (OC 2 h 4 ) y OH x=8, y=9) into the flask, heated up to 110-120°C, passed nitrogen under the liquid, stirred evenly, and then added acrylic acid monomer (the mixture of nonylphenol polyoxyethylene ether monomer and acrylic acid monomer) into the flask The molar ratio is 1:1.15), oleum (accounting for 1.5% of the total amount of the two monomers), phenothiazine (accounting for 0.04% of the total amount of the two monomers) and hydroquinone (accounting for the total amount of the two monomers 0.04%), the temperature was controlled at 110-120°C, and the reaction was carried out for 4-6 hours. After the temperature was lowered to 80-85°C, sodium hydroxide solution was added while stirring to neutralize to pH=6.5-7, and the unsaturated carboxylic acid- Alkyl...

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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, in particular to an air-entraining controllable polycarboxylate water reducer for pure machine-made sand concrete and a preparation method thereof. Background technique [0002] Polycarboxylate water reducer is widely used in construction projects due to its strong molecular structure designability, simple production process, high water reducing rate, good slump retention performance, strong adaptability to other materials, and green and pollution-free production process. It has been widely used and replaced the traditional naphthalene-based water reducer to become a type of admixture with the largest amount of engineering use, the highest technical content, and the most significant economic and environmental benefits. As a surfactant, the polycarboxylate water reducer itself has a certain air-entraining performance, but because of the large size and poor stability of the air bubbles it introdu...

Claims

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Application Information

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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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