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Slump resisting and water reducing type polycarboxylic acid slump resisting agent and preparation method thereof

A technology of polycarboxylic acid and water-reducing type, which is applied in the field of slump-retaining water-reducing polycarboxylate slump-retaining agent and its preparation, which can solve the problems of production temperature exceeding 100°C and large energy consumption, and achieve low production temperature and high process efficiency. The effect of low requirements and convenient mass production

Inactive Publication Date: 2018-03-06
北京时代思动科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The significant disadvantages of the polycarboxylate high slump retention agent in the prior art include: the production temperature exceeds 100°C, and the energy consumption is large

Method used

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  • Slump resisting and water reducing type polycarboxylic acid slump resisting agent and preparation method thereof
  • Slump resisting and water reducing type polycarboxylic acid slump resisting agent and preparation method thereof
  • Slump resisting and water reducing type polycarboxylic acid slump resisting agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] The slump-retaining and water-reducing polycarboxylic acid slump-preserving agent of this embodiment includes the following raw materials by weight:

[0012]

[0013] Preferably, the initiator is one or a mixture of antiseptic acid, citric acid, and oxalic acid.

[0014] Preferably, the molecular formula of the polyether is CH 2 =C(CH 3 )CH 2 CH 2 O(CH 2 CH 2 O)nCH 3 , Where n is a positive integer.

[0015] Preferably, the chain transfer agent is one or a mixture of thioglycolic acid, aliphatic mercaptan, and dodecyl mercaptan.

[0016] Preferably, the oxidant is one or a mixture of one or more of peracetic acid, performic acid, and hydrogen peroxide.

[0017] The preparation method of the slump-retaining and water-reducing polycarboxylic acid slump-retaining agent of this embodiment includes:

[0018] Step 1: Mix 4.5 parts of unsaturated carboxylic acid and 12 parts of hydroxyethyl acrylate plus 32 parts of deionized water for 15 minutes to prepare solution A;

[0019] Step 2: Ad...

Embodiment 2

[0024] The slump-retaining and water-reducing polycarboxylic acid slump-preserving agent of this embodiment includes the following raw materials by weight:

[0025]

[0026] The preparation method of the slump-retaining and water-reducing polycarboxylic acid slump-retaining agent of this embodiment includes:

[0027] Step one, stir 5.0 parts of unsaturated carboxylic acid and 13 parts of hydroxyethyl acrylate plus 32 parts of deionized water for 15 minutes to prepare solution A;

[0028] Step 2: Add 0.4 parts of initiator to 32 parts of deionized water and 0.5 parts of chain transfer agent configuration solution B;

[0029] Step 3: Keep 96 parts of deionized water at (40±2)℃, add 100 parts of polyether, stir to dissolve, add 0.3 part of oxidant after 20 minutes, add solution A and solution B dropwise after 5 minutes, control the dropping time It is about 210 minutes and 180 minutes respectively;

[0030] Step 4. After dripping, keep it warm for 90 minutes;

[0031] Step 5: After the hea...

Embodiment 3

[0033] The slump-retaining and water-reducing polycarboxylic acid slump-preserving agent of this embodiment includes the following raw materials by weight:

[0034]

[0035] The preparation method of the slump-retaining and water-reducing polycarboxylic acid slump-retaining agent of this embodiment includes:

[0036] Step one, stir 5.5 parts of unsaturated carboxylic acid and 14 parts of hydroxyethyl acrylate plus 33 parts of deionized water for 15 minutes to prepare solution A;

[0037] Step 2: Add 0.3 parts of initiator to 33 parts of deionized water and 0.4 parts of chain transfer agent configuration solution B;

[0038] Step 3: Keep 99 parts of deionized water at (40±2)℃, add 100 parts of polyether, stir to dissolve, add 0.5 part of oxidant after 20 minutes, add solution A and solution B dropwise after 5 minutes, control the dropping time It is about 210 minutes and 180 minutes respectively;

[0039] Step 4. After dripping, keep it warm for 90 minutes;

[0040] Step 5: After the hea...

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Abstract

The invention discloses a slump resisting and water reducing type polycarboxylic acid slump resisting agent and a preparation method thereof. The slump resisting and water reducing type polycarboxylicacid slump resisting agent is prepared from 100 parts of polyether, 4.5 to 6.1 parts of unsaturated carboxylic acid, 0.3 to 0.6 part of a chain transfer agent, 0.1 to 0.4 part of an initiator, 0.3 to0.5 part of an oxidant, 160 to 172 parts of deionized water and 12 to 16 parts of hydroxyethyl acrylate. The slump resisting and water reducing type polycarboxylic acid slump resisting agent disclosed by the invention has the advantages of low production temperature, simple synthesis method, low process requirement, environmental friendliness, high efficiency and convenience for batch production.The slump resisting and water reducing type polycarboxylic acid slump resisting agent can improve the workability of concrete under a condition of a low mixing amount, and also has an extremely goodwater reducing effect to achieve slump resisting and water reducing effects. According to the preparation method, a solution A and a solution B are separately produced by adopting raw materials, and 20% of deionized water is used; then the dropwise adding time is controlled stage by stage, and 60% of deionized water is used; a test result shows that the slump resisting effect of the slump resisting and water reducing type polycarboxylic acid slump resisting agent is good; the workability of the concrete can be maintained by early release and later release, and even the short-time later workability is higher.

Description

Technical field [0001] The invention relates to a slump-retaining and water-reducing polycarboxylic acid slump-preserving agent and a preparation method thereof. Background technique [0002] Water reducer is one of the five indispensable components of high performance concrete. Polycarboxylic acid water reducing agent has the advantages of low dosage, high water reducing rate, greater freedom in molecular structure design, and environmental friendliness. It is known as the third-generation concrete superplasticizer and has become a hot spot in the field of concrete admixtures. The focus of development. Polycarboxylic acid slump inhibitors containing polyether side chains are widely used in major projects such as high-speed railway projects, airport projects, and sea-crossing bridge projects because of their green environmental protection and high water reduction rate. The significant shortcomings of the polycarboxylic acid high slump retention agent in the prior art include: t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/28C08F2/38C04B24/32
CPCC04B24/32C04B2103/302C08F2/38C08F283/065C08F220/281
Inventor 周敏江淏宇
Owner 北京时代思动科技有限公司
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