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Novel polycarboxylate based superplasticizer and preparation method thereof

A technology of polycarboxylate and water reducer, applied in the field of concrete admixture, can solve the problems of enlargement, uneven dispersion, unfavorable engineering application, etc., and achieve the effect of simple process, low cost, and solution to dispersion problems

Inactive Publication Date: 2019-01-08
CHINA BUILDING MATERIALS ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] (1) The prior art mainly adopts ultrasonic dispersion or mechanical dispersion to disperse graphene oxide, which is unfavorable for practical engineering applications;
[0006] (2) The existing technology has not been able to solve the high water demand of graphene oxide and improve the fluidity of cement-based materials;
[0007] (3) The existing technology is mainly to directly add graphene oxide into cement-based materials, resulting in uneven dispersion and limiting its application in cement-based materials

Method used

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  • Novel polycarboxylate based superplasticizer and preparation method thereof

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preparation example Construction

[0028] like figure 1 As shown, the preparation method of the polycarboxylate water reducer provided by the embodiment of the present invention includes:

[0029] S101: Add vinyl polyglycol ether (ester), reducing agent, and water into the reaction kettle, and heat to 20-40°C;

[0030] S102: Add (meth)acrylic acid (ester) or one or more monomer solutions and oxidant solutions in other vinyl monomers or derivatives dropwise, and react at 20-60°C for 2-14 hours;

[0031] S103: After the dropwise addition is completed, keep the reaction at 20-60°C for 2-5 hours;

[0032] S104: Use 30wt% sodium hydroxide solution to adjust the pH value of the solution to 6-8 to obtain a new polycarboxylate water reducer product.

[0033] The vinyl monomers provided by the embodiments of the present invention are mainly two or more of (meth)acrylic acid (ester), vinyl polyglycol ether (ester), other vinyl monomers and derivatives;

[0034] The initiator provided in the embodiment of the present i...

Embodiment 1

[0038] The components and mass ratios of the polycarboxylate water reducer provided in the embodiment of the present invention are: vinyl polyglycol ether (ester) 30, (meth)acrylic acid (ester) or other vinyl monomers and derivatives 5 parts of substance, 0.1 part of oxidant, 0.05 part of reducing agent and 40 parts of water.

Embodiment 2

[0040] The components and mass ratios of the polycarboxylate water reducer provided in the embodiment of the present invention are: 40 parts of vinyl polyglycol ether (ester), (meth)acrylic acid (ester) or other vinyl monomers and 15 parts of derivatives, 2 parts of oxidizing agent, 2 parts of reducing agent and 60 parts of water.

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Abstract

The invention belongs to the technical field of concrete admixtures and discloses a novel polycarboxylate based superplasticizer and a preparation method thereof. The polycarboxylate based superplasticizer comprises the following components: vinyl polyethylene glycol ether (ester), (meth) acrylic acid (acrylate) or other vinyl monomers and derivatives, an oxidizing agent, a reducing agent and water. The preparation method comprises the following steps: adding the vinyl polyethylene glycol ether (ester), the reducing agent and the water into a reactor, and heating; respectively dropping one ormore monomer solutions in the (meth) acrylic acid (acrylate) or other vinyl monomers and derivatives and an oxidizing agent solution, and reacting; maintaining the temperature and reacting after dropping completion; regulating the pH value of the solution with a sodium hydroxide solution, thereby obtaining the novel polycarboxylate based superplasticizer. According to the method disclosed by the invention, graphene oxide is introduced into the molecular structure of the polycarboxylate based superplasticizer, so that the dispersion problem of the graphene oxide in the admixture and cement-based materials can be fundamentally solved, and the mechanical property and durability of the cement-based materials are improved.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, in particular to a polycarboxylate water reducer and a preparation method thereof. Background technique [0002] At present, the existing technologies commonly used in the industry are as follows: [0003] Polycarboxylate superplasticizer is an admixture used in cement-based materials, which can significantly improve the working performance, mechanical properties and durability of cement-based materials, and has become an indispensable component in concrete. Some researchers have pointed out that when graphene oxide is mixed into cement-based materials, it can regulate the hydration products of cement and have a strengthening and toughening effect on cement-based materials. But at present, graphene oxide is mainly pre-dispersed by ultrasonic dispersion, mechanical dispersion or surfactant before being used, and then added to cement-based materials for use. During use, graphene oxide...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/18C08F4/40C04B24/26C04B103/30
CPCC04B24/2647C04B2103/302C08F4/40C08F283/065C08F220/18
Inventor 姚燕高瑞军吴浩王玲
Owner CHINA BUILDING MATERIALS ACAD
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