Viscosity reduction type polycarboxylic acid water reducing agent and preparation method thereof

A technology of viscous polycarboxylic acid and water reducing agent, which is applied in the field of water reducing agent, can solve the problems of high viscosity and slow flow speed of freshly mixed concrete, and achieve the effect of reducing internal friction, reducing viscosity, and good viscosity reducing effect

Active Publication Date: 2021-07-09
唐山冀东水泥外加剂有限责任公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Nowadays, some high-strength or ultra-high-strength concretes have high viscosity and slow flow rate due to their high glue material and low water-binder ratio. However, the above-mentioned polycarboxylate water reducers are still difficult to meet the performance requirements of reducing the viscosity of concrete. Therefore, still needs to be improved

Method used

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  • Viscosity reduction type polycarboxylic acid water reducing agent and preparation method thereof
  • Viscosity reduction type polycarboxylic acid water reducing agent and preparation method thereof
  • Viscosity reduction type polycarboxylic acid water reducing agent and preparation method thereof

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Embodiment 1

[0040] This application discloses a viscosity-reducing polycarboxylate water reducer, the raw materials of which include methacrylic acid, acrylic acid, methoxypolyethylene glycol acrylate, sodium methacrylate, initiator, 3-oxetane Ketone, dimethyl sebacate and water, wherein the initiator is ammonium persulfate, and the contents of each component are shown in Table 1 below.

[0041] A preparation method of a viscosity-reducing polycarboxylate water reducer, comprising the steps of:

[0042] Mix 3-oxetanone and dimethyl sebacate, heat up to 40°C and stir for 30 minutes to obtain a heterocyclic product;

[0043] Under the condition of constant temperature water bath at 90°C, mix methacrylic acid, acrylic acid, methoxypolyethylene glycol acrylate and sodium methacrylic sulfonate to obtain a mixed solution, then add it dropwise to water, and then add the initiator dropwise, in 3h After the internal dropwise addition, continue to keep warm for 1 hour, adjust the pH value to 5 wit...

Embodiment 2

[0045] This application discloses a viscosity-reducing polycarboxylate water reducer, the raw materials of which include methacrylic acid, acrylic acid, methoxypolyethylene glycol acrylate, sodium methacrylate, initiator, 3-oxetane Ketone, dimethyl sebacate and water, wherein the initiator is potassium persulfate, and the contents of each component are shown in Table 1 below.

[0046] A preparation method of a viscosity-reducing polycarboxylate water reducer, comprising the steps of:

[0047] Mix 3-oxetanone and dimethyl sebacate, heat up to 45°C and stir for 40 minutes to obtain a heterocyclic product;

[0048] Under the condition of constant temperature water bath at 95°C, mix methacrylic acid, acrylic acid, methoxypolyethylene glycol acrylate and sodium methacrylic sulfonate to obtain a mixed solution, then add it dropwise to water, and then add the initiator dropwise, in 4h After the internal dropwise addition, continue to keep warm for 1 hour, adjust the pH value to 6 wi...

Embodiment 3

[0050]This application discloses a viscosity-reducing polycarboxylate water reducer, the raw materials of which include methacrylic acid, acrylic acid, methoxypolyethylene glycol acrylate, sodium methacrylate, initiator, 3-oxetane Ketone, dimethyl sebacate and water, wherein the initiator is ammonium persulfate, and the contents of each component are shown in Table 1 below.

[0051] A preparation method of a viscosity-reducing polycarboxylate water reducer, comprising the steps of:

[0052] Mix 3-oxetanone and dimethyl sebacate, heat up to 43°C and stir for 35 minutes to obtain a heterocyclic product;

[0053] Under the condition of a constant temperature water bath at 92°C, mix methacrylic acid, acrylic acid, methoxypolyethylene glycol acrylate and sodium methacrylic sulfonate to obtain a mixed solution, then add it dropwise to water, and then add the initiator dropwise, within 3 hours After the internal dropwise addition, continue to keep warm for 1 hour, and adjust the pH ...

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Abstract

The invention relates to the field of water reducing agents, and discloses a viscosity reduction type polycarboxylic acid water reducing agent and a preparation method thereof. The viscosity reduction type polycarboxylic acid water reducing agent comprises the following raw materials in parts by weight: 5-8 parts of methacrylic acid; 15-20 parts of acrylic acid; 2-3 parts of methoxy polyethylene glycol acrylate; 1-2 parts of sodium methallyl sulfonate; 1-2 parts of an initiator; 4-5 parts of 3-oxetanone; 1.5-2 parts of dimethyl sebacate; and 40-50 parts of water. The preparation method comprises the following steps: mixing 3-oxetanone and dimethyl sebacate, and adding the mixture into a polycarboxylic acid product mixed with water to obtain the water reducing agent. The polycarboxylic acid water reducing agent has the following advantages and effects: a mixed product of 3-oxetanone and dimethyl sebacate is further added into a conventional polycarboxylic acid water reducing agent component, so that the mixed product is diffused among cement particles. Through combination of heterocyclic atoms with oily molecules and the special steric configuration of 3-oxetanone, the generation of a complex among cement particles is reduced. The aggregation among cement particles is reduced, the purpose of reducing the viscosity is achieved, and the viscosity of the concrete is reduced.

Description

technical field [0001] The present application relates to the field of water reducers, in particular to a viscosity-reducing polycarboxylate water reducer and a preparation method thereof. Background technique [0002] When preparing concrete with higher strength grades, high-performance water-reducing agents with high water-reducing rates are usually selected. Polycarboxylate superplasticizer has excellent properties such as high water reducing rate, obvious reinforcement effect, and low slump loss of concrete mixture, and has become a hot spot in the research and development of superplasticizers at home and abroad. [0003] At present, the patent with the publication number CN106348635A discloses a polycarboxylate water reducer, which is composed of the following raw materials in parts by weight: 10-15 parts of isobutenol polyoxyethylene ether, 5-8 parts of tartaric acid, 1- 3 parts, 0.5-2 parts of sodium methacrylate, 1-2 parts of paraben preservatives, 10-20 parts of wa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/16C08F283/06C08F220/06C08F228/02C04B103/30
CPCC04B40/0039C08F283/065C04B2103/302C08F220/06C08F228/02C04B24/045C04B24/165
Inventor 王倩郭自刚王建朋刘禹杉张冬冬苏鹏举李兴武王立彬赵百顺王思远任建波张楠高茄砾高峰刘利光王晓英
Owner 唐山冀东水泥外加剂有限责任公司
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