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Mud-resistant polycarboxylate-type water reducing agent and preparation method and application thereof

A polycarboxylic acid-based, mud-resistant technology, applied in the field of cement concrete admixtures, can solve the problems of low working effect of polycarboxylate water reducing agent, low water-reducing efficiency, large slump loss, etc. Layer adsorption, favorable dispersion, low cost effect

Pending Publication Date: 2020-05-01
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the polycarboxylate superplasticizer is very sensitive to the clay contained in the aggregate, especially when the clay content is greater than 3%, there are often problems such as low water reduction efficiency and large slump loss, making the polycarboxylate superplasticizer The work effect is greatly reduced

Method used

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  • Mud-resistant polycarboxylate-type water reducing agent and preparation method and application thereof
  • Mud-resistant polycarboxylate-type water reducing agent and preparation method and application thereof
  • Mud-resistant polycarboxylate-type water reducing agent and preparation method and application thereof

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preparation example Construction

[0032] The present invention also provides a preparation method of the mud-resistant polycarboxylate superplasticizer, comprising the following steps:

[0033] (1) Mix methacrylamide and acrylic acid with water to make mixed solution A; mix allyl polyethylene glycol with water to make solution B; mix initiator and transfer agent with water to make mixed solution Liquid C;

[0034] (2) After mixing the mixed solution A, solution B and mixed solution C, heat them to a first temperature, and perform free radical polymerization to obtain a polymerized product;

[0035] (3) At the first temperature, adjust the pH value of the polymerization product to 6.5-7 to obtain a mud-resistant polycarboxylate water reducer.

[0036] In the present invention, mix methacrylamide and acrylic acid with water to make mixed solution A, mix allyl polyethylene glycol with water to make solution B; mix initiator and transfer agent with water to make Mixture C. In the present invention, there is no ...

Embodiment 1

[0046] Calculated by weight percentage, the mass percentage of acrylic acid, methacrylamide, and allyl polyethylene glycol (polymerization degree 7) is 55:40:100;

[0047] At room temperature, mix methacrylamide and acrylic acid with water to prepare a 50% solution A; mix low-molecular allyl polyethylene glycol with water to prepare a 60% solution B; use acrylic acid, The total amount of methacrylamide and allyl polyethylene glycol is used as a benchmark, and the mass fraction is 1% initiator potassium persulfate and 0.5% mercaptoethanol and water to prepare mixed solution C, mixed solution C The water consumption is 30% of the total water quantity of mixed solution A and solution B.

[0048] Add the mixed solution A, solution B and mixed solution C dropwise into the reaction vessel at a rate of 2ml / min; after heating to 70°C, keep the reaction for 5 hours.

[0049] After the reaction, add dropwise a 30% sodium hydroxide solution while stirring, and adjust the pH value of the...

Embodiment 2

[0051] Calculated by weight percentage, the mass percentage of acrylic acid, methacrylamide, and allyl polyethylene glycol (polymerization degree 7) is 35:25:100;

[0052] At room temperature, mix methacrylamide and acrylic acid with water to prepare a 60% solution A; mix low-molecular propyl polyethylene glycol with water to prepare a 65% solution B; Based on the total amount of allyl acrylamide and allyl polyethylene glycol, the mass fraction is 1.5% initiator potassium persulfate and 2% mercaptoethanol and water are formulated into mixed solution C, and the mixed solution C The water consumption is 30% of the total water content of the mixed solution A and solution B.

[0053] Add the mixed solution A, solution B and mixed solution C dropwise into the reaction vessel at a rate of 2ml / min; after heating to 70°C, keep the reaction for 5 hours.

[0054] After the reaction, add dropwise a 30% sodium hydroxide solution while stirring, and adjust the pH value of the reaction mix...

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Abstract

The invention provides a mud-resistant polycarboxylate-type water reducing agent. According to the invention, the molecular structure of the water reducing agent contains amide groups, so competitiveadsorption of clay to the polycarboxylate-type water reducing agent can be effectively reduced, the adsorption amount of the polycarboxylate-type water reducing agent is increased, and the dispersioneffect of the polycarboxylate-type water reducing agent on cement particles is facilitated; and as the molecular structure of the water reducing agent has a short polyoxyethylene side chain, the intercalation adsorption effect of the clay on the polycarboxylate-type water reducing agent can be effectively reduced, and the water reducing efficiency of the polycarboxylate-type water reducing agent is improved. The preparation method of the mud-resistant polycarboxylate-type water reducing agent provided by the invention is wide in raw material source, low in cost, simple in production process operation, easy to control, safe and environment-friendly, and does not use an organic solvent.

Description

technical field [0001] The invention belongs to the technical field of cement concrete admixtures in building materials, and in particular relates to a mud-resistant polycarboxylate water reducer and its preparation method and application. Background technique [0002] Polycarboxylate superplasticizer has been widely concerned as a key material to improve the workability and rheological properties of concrete, and has become the fifth component of concrete. Because polycarboxylic acid exhibits many advantages such as high water reducing rate, strong dispersing force, good workability, low dosage, strong controllable molecular structure, and environmental protection, it has been successfully applied to high-speed rail, bridges, tunnels, and nuclear power plants. and other major projects. In the future, with the gradual improvement of engineering quality requirements and the increasing demand for high-performance concrete, the application range of polycarboxylate superplastic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F216/14C08F220/56C08F220/06C04B24/26C04B103/30
CPCC08F216/14C04B24/2694C04B2103/302
Inventor 任骏王耀城谭洪波王险峰方云辉
Owner SHENZHEN UNIV
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