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Low-air-entraining delayed coagulation type polycarboxylate superplasticizer and preparation method thereof

A technology of retarding polycarboxylic acid and water reducing agent, which is applied in the field of concrete admixtures, can solve the problems of low air content water reducing agent, etc., achieve low air content, good bonding effect, and change the effect of hydrophilicity

Inactive Publication Date: 2020-07-24
浙江和业科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the polycarboxylate water reducer prepared by this method still has an air content of about 1% in application, so it is necessary to improve its process to prepare a water reducer with a lower air content

Method used

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  • Low-air-entraining delayed coagulation type polycarboxylate superplasticizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The raw materials of the following mass components were selected: 1.2 parts of macromonomer, 0.1 part of acrylic acid, 0.2 part of sodium methacrylate sulfonate, 0.01 part of 2-hydroxyethyl methacrylate phosphate, 0.005 part of silane-modified graphene, and 0.00015 parts of ammonium sulfate, 0.0002 parts of neutralizing agent, 3 parts of water, and the ratio of isopentenyl:polyoxyethylene:polyoxypropylene ether in the macromonomer is 1:1.5:3.

[0022] The preparation process is as follows:

[0023] Step 1: Dissolve the weighed macromonomer in 1 part of water to obtain aqueous solution A, and dissolve acrylic acid, sodium methacrylate sulfonate, 2-hydroxyethyl methacrylate phosphate and silane-modified graphene in 2 parts Aqueous solution B was obtained in water, and ammonium persulfate was dissolved in 1 part of water to obtain aqueous solution C;

[0024] Step 2: Add aqueous solution A, aqueous solution B and aqueous solution C in sequence in a container equipped with...

Embodiment 2

[0029] The raw materials of the following mass components were selected: 1 part of macromonomer, 0.235 parts of acrylic acid, 0.1 part of sodium methacrylate sulfonate, 0.027 parts of 2-hydroxyethyl methacrylate phosphate, 0.0035 parts of silane-modified graphene, and 0.0002 parts of ammonium sulfate, 0.00015 parts of neutralizing agent, 5 parts of water, and the ratio of isopentenyl:polyoxyethylene:polyoxypropylene ether in the macromonomer is 1:1.5:3.

[0030] The preparation process is as follows:

[0031] Step 1: Dissolve the weighed macromonomer in 1.5 parts of water to obtain aqueous solution A, and dissolve acrylic acid, sodium methacrylate sulfonate, 2-hydroxyethyl methacrylate phosphate and silane-modified graphene in 1 part Aqueous solution B was obtained in water, and ammonium persulfate was dissolved in 2.5 parts of water to obtain aqueous solution C;

[0032] Step 2: Add aqueous solution A, aqueous solution B and aqueous solution C in sequence in a container equi...

Embodiment 3

[0037] A low-air-entraining and retarding-setting polycarboxylate water reducer, which consists of the following ingredients in parts by weight: 0.5 parts of macromonomer, 0.3 parts of acrylic acid, 0.05 parts of sodium methacrylate, 2-hydroxyethyl methacrylic acid 0.035 parts of ester phosphate, 0.002 parts of silane-modified graphene, 0.0002 parts of ammonium persulfate, 0.0002 parts of neutralizing agent, and 6 parts of water.

[0038] The isopentenyl group in the macromonomer: polyoxyethylene: polyoxypropylene ether is 1:1.8:2.5.

[0039] The preparation method of the described low air-entraining retarding polycarboxylate water reducer comprises the following steps:

[0040]Step 1: According to the ratio, extract the raw materials, dissolve the macromonomer in water to obtain aqueous solution A, mix acrylic acid, sodium methacrylate sulfonate, 2-hydroxyethyl methacrylate phosphate and silane-modified graphite Alkene is dissolved in water to obtain aqueous solution B, and ...

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Abstract

The invention discloses a low-air-entraining delayed coagulation type polycarboxylate superplasticizer. The composition comprises the following components in parts by mass: 0.5-1.2 parts of macromonomer, 0.1-0.3 part of acrylic acid, 0.05-0.2 part of sodium methallyl sulfonate, 0.01-0.035 part of 2-(2-hydroxyethyl) methacrylate phosphate ester, 0.002-0.005 part of silane modified graphene, 0.00015-0.0002 part of ammonium persulfate, 0.0001-0.0002 part of a neutralizer and 3-6 parts of water. The low-air-entraining delayed coagulation type polycarboxylate superplasticizer has advantages of favorable dispersity, favorable plasticity retention, high water reducing rate, effective reduction of gas introduction and favorable delayed coagulation effect under the condition of lower doping amount.The silane modified graphene is added so that the bonding effect among the components is better in the reaction process, gaps among molecules after reaction are smaller and the gas content is lower.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a low air-entraining retarding polycarboxylate water reducer and a preparation method thereof. Background technique [0002] In engineering applications, polycarboxylate superplasticizers will cause excessive air-entrainment, resulting in excessive air content in concrete and reduced concrete hardening strength. Now the usual method is to compound with defoamers to reduce the amount of air in concrete. The air content of the polycarboxylate superplasticizer can improve the effect of the polycarboxylate superplasticizer on the concrete hardening strength, but the effect is not ideal. At the same time, the retarding effect of the polycarboxylate superplasticizer is weak. Although the compounding of water agent can achieve the retarding effect, the setting time is often too short or too long due to some reasons, which has a great impact on the concrete. [0003] Chinese...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/16C08F283/06C08F220/06C08F228/02C08F230/02C04B103/30
CPCC04B40/0046C04B2103/302C08F283/065C08F220/06C08F228/02C04B24/165C04B22/02
Inventor 孙洪彬
Owner 浙江和业科技有限公司
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