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A kind of modified polycarboxylate water reducing agent and preparation method thereof

A technology of polycarboxylic acid and water reducing agent, applied in the preparation of modified polycarboxylate water reducing agent and the field of modified polycarboxylate water reducing agent, can solve the problem of large slump loss, long concrete transportation time, slump Easy to lose and other problems, to achieve the effects of easy operation, long collapse retention time, and simple process

Active Publication Date: 2022-05-13
武汉三源特种建材有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the slump loss is too large due to the long time of concrete transportation, especially the problem that the slump is more likely to be lost under high temperature in summer, the invention provides a preparation method of a modified polycarboxylate water reducer. The modified polycarboxylate water-reducer prepared by this method is added to concrete, and the slump of concrete can be kept at 30°C for 3 hours without loss, and the range of slump loss for 4 hours does not exceed 3%.

Method used

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  • A kind of modified polycarboxylate water reducing agent and preparation method thereof
  • A kind of modified polycarboxylate water reducing agent and preparation method thereof
  • A kind of modified polycarboxylate water reducing agent and preparation method thereof

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Embodiment 1

[0034] The preparation method of modified polycarboxylic acid water reducing in the present embodiment comprises the following steps:

[0035] S1. Weigh 95 parts of methallyl polyoxyethylene ether and 3 parts of hydroxyethyl acrylate and dissolve them in water at 15°C to obtain solution A with a mass concentration of methallyl polyoxyethylene ether of 40%; weigh Take 6 parts of acrylic acid and 12 parts of hydroxyethyl acrylate and add it to water to prepare a solution B with a mass concentration of 23.5% of hydroxyethyl acrylate; weigh 0.7 parts of ascorbic acid and 2 parts of thioglycolic acid and add it to water to prepare a solution B with a mass concentration of thioglycolic acid of 4.5%. % solution C; weigh 3 parts of dimethyl diallyl ammonium chloride to prepare an aqueous solution with a mass concentration of 5%, which is solution D.

[0036] S2. At 15°C, add 0.7 parts of 30% hydrogen peroxide to solution A to obtain solution E. After stirring for 5 to 10 minutes, star...

Embodiment 2

[0038] The preparation method of modified polycarboxylic acid water reducing in the present embodiment comprises the following steps:

[0039] S1. Weigh 100 parts of isopentenyl polyoxyethylene ether and 6 parts of hydroxypropyl acrylate and dissolve them in water at 20°C to obtain a solution A with a mass concentration of isopentenyl polyoxyethylene ether of 45%; weigh 6 parts 1 part of fumaric acid and 14 parts of hydroxypropyl acrylate were added to water to prepare solution B with a mass concentration of hydroxypropyl acrylate of 17.5%; 0.5 parts of ferrous sulfate and 2.5 parts of mercaptopropionic acid were added to water to prepare mercaptopropionic acid Solution C with a mass concentration of 8.5%; weigh 4 parts of dimethyl diallyl ammonium chloride to prepare an aqueous solution with a mass concentration of 9%, which is solution D.

[0040] S2. At 20°C, add 1 part of ammonium persulfate to solution A to obtain solution E. After stirring for 5-10 minutes, start to add ...

Embodiment 3

[0042] The preparation method of modified polycarboxylic acid water reducing in the present embodiment comprises the following steps:

[0043] S1. Weigh 100 parts of allyl polyoxyethylene ether and 4.5 parts of hydroxybutyl acrylate and dissolve them in water at 40°C to obtain a solution A with a mass concentration of allyl polyoxyethylene ether of 45%; weigh 4.5 parts of horse Toric anhydride and 12.5 parts of hydroxybutyl acrylate were added to water to prepare a solution B with a mass concentration of butyl acrylate of 29.5%; 0.8 parts of sodium ascorbate and 3 parts of mercaptoethanol were added to water to prepare a solution B with a mass concentration of mercaptoethanol of 6.5%. Solution C: Weigh 5 parts of methacryloxyethyltrimethylammonium chloride to prepare an aqueous solution with a mass concentration of 10%, which is solution D.

[0044] S2. At 40°C, add 0.8 parts of potassium persulfate to solution A to obtain solution E. After stirring for 5 to 10 minutes, start to...

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Abstract

The invention provides a preparation method of a modified polycarboxylate water reducer and the modified polycarboxylate water reducer prepared by the method. In this method, each raw material is first prepared into an aqueous solution: first, part of the hydroxyacrylate and polyether macromonomer is dissolved in water to prepare solution A, and then another part of acrylate hydroxyester and unsaturated acid is dissolved in water to prepare solution B. Reduced initiator and chain transfer agent are dissolved in water to prepare solution C, and cationic modifier is dissolved in water to prepare solution D; secondly, the raw materials are gradually reacted according to the fixed order of addition: add the oxidized initiator to solution A Obtain solution E; after stirring for 5-10 minutes, start to drop solutions B, C, and D into solution E at the same time, stir while adding drops, and continue to react for 1-2 hours after solution C is added dropwise to obtain modified polycarboxylate Acid superplasticizer solution. The modified polycarboxylate water reducer prepared by the method can keep the concrete slump at 30 DEG C for at least 3 hours without loss, and keep the loss range of no more than 3% for 4 hours.

Description

technical field [0001] The invention belongs to the field of concrete admixtures, and relates to a preparation method of a modified polycarboxylate water reducer and the modified polycarboxylate water reducer prepared according to the method. Background technique [0002] Polycarboxylate superplasticizer, as the third generation of high-performance concrete superplasticizer, has the advantages of low dosage and high water-reducing rate, and has become an essential material and core technology for manufacturing high-performance modern concrete. However, with the improvement of concrete performance requirements in modern engineering, the simple high water reducing rate can no longer meet the engineering requirements for polycarboxylate water reducing agent performance. At present, in the application process of commercial concrete, one of the most common and main problems is the loss of concrete slump. Ready-mixed concrete is commonly used in modern engineering. The production...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F220/06C08F220/20C08F222/02C08F222/06C04B24/26C04B103/30
CPCC08F283/065C04B24/2694C04B2103/302C08F220/06C08F220/20C08F222/02C08F222/06
Inventor 潘阳汪源纪宪坤苑立东
Owner 武汉三源特种建材有限责任公司