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A kind of concrete viscosifying type viscosity modifier and preparation method thereof

A viscosity modifier and concrete technology, which is applied in the field of concrete admixtures, can solve the adverse effects of the retention of concrete work performance in the later stage of strength development, increase the work difficulty of production and quality control personnel in concrete enterprises, and the solid content of the thickener. The problem of large body content, etc., is beneficial to the development of concrete strength, the effect of increasing the viscosity is significant, and the effect of improving the operability is achieved.

Active Publication Date: 2021-05-07
WUHAN YUANJIN BUILDING MATERIALS TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most viscosity modifiers, such as xanthan gum, Wenlun gum, cyclodextrin, cellulose ether, polyacrylamide and polyvinyl alcohol, have poor compatibility with polycarboxylate superplasticizers, and it is easy to mix them directly Delamination caused by precipitation is not conducive to the normal construction of concrete, and at the same time has an adverse effect on the maintenance of concrete work performance and the development of later strength. For example, Chinese patent document CN104231152A discloses a preparation method of a concrete thickener. The poor compatibility between the agent and the polycarboxylate superplasticizer has an adverse effect on the working performance of the concrete
[0004] Chinese patent document CN103554392A discloses a thickener copolymer, which is obtained by polymerizing unsaturated polyether monomers, unsaturated polyether carboxylate monomers and unsaturated carboxylic acid monomers. It has excellent water retention properties and is suitable for concrete Fluidity is less affected, and it has good compatibility with polycarboxylate superplasticizer, but the thickener has a high solid content and a large content of carboxylic acid monomer in the molecular structure, which has a great influence on the compressive strength of concrete, and The dosage sensitivity is strong, which greatly increases the work difficulty of the production and quality control personnel of concrete enterprises
Chinese patent document CN106478893A discloses a preparation method of a concrete viscosity regulator, but the viscosity regulator is highly sensitive to the dosage and has a certain viscosity-lowering effect

Method used

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  • A kind of concrete viscosifying type viscosity modifier and preparation method thereof
  • A kind of concrete viscosifying type viscosity modifier and preparation method thereof
  • A kind of concrete viscosifying type viscosity modifier and preparation method thereof

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preparation example Construction

[0029] A preparation method of concrete viscosifying type viscosity modifier, comprising the following steps:

[0030](1) Dissolve the modified polyether monomer, unsaturated amide monomer, unsaturated carboxylic acid monomer and crosslinking agent with a mass ratio of 1-20:15-30:10-25:1-5 in a mass ratio of 400% to 600% of the total monomer mass in deionized water to obtain a monomer mixed solution;

[0031] (2) Dissolve unsaturated amide monomer and unsaturated carboxylic acid monomer of the same quality as in the monomer mixed solution in deionized water, and record it as liquid A;

[0032] (3) in N 2 And under the condition of 40-60°C, slowly add the initiator solution and A solution with a mass percentage concentration of 0.1%-1% to the above-mentioned monomer mixed solution within 1-3 hours, and keep warm at 60-90°C Continue stirring for 2-6 hours, add lye to adjust the pH value to 6-8, add water and dilute to obtain a thickening type viscosity regulator with a solid c...

Embodiment 1

[0041] A preparation method of concrete viscosifying type viscosity modifier, comprising the following steps:

[0042] (1) Weigh 2.6g isopentenol polyoxyethylene ether, 6.4g N,N-dimethylacrylamide, 4.65g acrylic acid and 0.5g polyoxyalkylene diallyl ether and dissolve them in 135g deionized water to obtain Monomer mixed solution, transfer the solution to a 1000mL four-neck flask equipped with a stirring device, a thermometer, a constant pressure dropping funnel and a nitrogen inlet, heat and stir (180r / min) and feed nitrogen;

[0043] (2) Dissolve 6.4g of N,N-dimethylacrylamide and 4.65g of acrylic acid in 22g of deionized water, mix well and record as liquid A;

[0044] (3) take by weighing 0.2g azobisisobutylamidine hydrochloride and be dissolved in 40g deionized water completely, as initiator solution, in N 2 And under the condition of 50°C, slowly add the initiator solution and A solution into the above-mentioned monomer mixed solution within 1 hour. After the dropwise ad...

Embodiment 2

[0047] A preparation method of concrete viscosifying type viscosity modifier, comprising the following steps:

[0048] (1) Weigh 3.0g isopentenol polyoxyethylene ether, 7.35g methacrylamide, 6.15g methacrylic acid and 0.3g polyoxyalkylene diallyl ether and dissolve them in 156g deionized water to obtain monomer Mix the solution, transfer the solution to a 1000mL four-neck flask with a stirring device, a thermometer, a constant pressure dropping funnel and a nitrogen inlet, heat and stir (180r / min) and feed nitrogen;

[0049] (2) Weigh 7.35g of methacrylamide and 6.15g of methacrylic acid and dissolve them in 27g of deionized water, mix well and record as liquid A;

[0050] (3) take by weighing 0.24g azobisisobutylamidine hydrochloride and be dissolved in 40g deionized water completely, as initiator solution, in N 2 And under the condition of 50°C, slowly add the initiator solution and liquid A into the above-mentioned monomer mixed solution within 1.5h. Adjust the pH value o...

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Abstract

The invention discloses a concrete viscosity-increasing viscosity regulator and a preparation method thereof, comprising the following steps: dissolving modified polyether monomers, unsaturated amide monomers, unsaturated carboxylic acid monomers and crosslinking agents in deionized water , to obtain a monomer mixed solution; dissolve the unsaturated amide monomer and unsaturated carboxylic acid monomer in deionized water, and record it as liquid A; 2 Under the condition of 40-60°C, slowly add the initiator solution and liquid A into the monomer mixed solution dropwise, continue to stir and react at 60-90°C, adjust the pH value, and dilute with water to obtain the viscosity modifier. The viscosity modifier of the present invention has good compatibility with the polycarboxylate water reducer, can effectively adjust the cohesion of concrete, solve the problems of concrete segregation and bleeding, without affecting the slump retention performance and setting time of concrete, and can resist compression of concrete The strength development is favorable; at the same time, the optimization and regulation of the polymerization process improves the stability of the product, reduces the sensitivity of the product’s dosage, and improves the ease of on-site construction.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, in particular to a concrete viscosity-increasing viscosity regulator and a preparation method thereof. Background technique [0002] With the development of large-scale and high-rise concrete structures, the demand for high-performance high-strength, ultra-high-strength concrete, and high-fluidity concrete in building construction is increasing. Under the condition of not changing the mix ratio of high-strength concrete, its working performance is often improved by increasing the amount of polycarboxylate superplasticizer. Polycarboxylate superplasticizer has the advantages of high water reducing rate, good slump retention performance, low concrete shrinkage rate, and environmental protection, but it will lead to problems such as poor cohesion, bleeding, and segregation of concrete. In addition, medium and low-grade concrete is highly sensitive to the addition of superplasticizers, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F220/54C08F220/56C08F222/02C08F220/06C04B24/26C04B103/44
CPCC04B24/2694C04B2103/44C08F283/065C08F220/54C08F220/56C08F222/02C08F220/06
Inventor 汪源夏修建李伟鹏苑立东
Owner WUHAN YUANJIN BUILDING MATERIALS TECH CO LTD
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