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A slow-release polycarboxylate water reducer, its preparation method and use method

A slow-release polycarboxylic acid and water-reducing agent technology, which is applied in the field of building materials, can solve problems such as unsatisfactory slow-release effects, and achieve the effects of large-scale industrial production, good fluidity retention, and simple process

Active Publication Date: 2016-09-07
SHANGHAI DONGDA CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the unsatisfactory slow-release effect of the existing polycarboxylate water-reducer, and provide a new slow-release polycarboxylate water-reducer and its preparation method and use method

Method used

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  • A slow-release polycarboxylate water reducer, its preparation method and use method
  • A slow-release polycarboxylate water reducer, its preparation method and use method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Preparation before polymerization:

[0039] Preparation of solution A: Weigh 6 parts by weight of acrylic acid, 1.80 parts by weight of methacrylic acid, 9.50 parts by weight of hydroxyethyl acrylate, 5.40 parts by weight of hydroxypropyl acrylate and 39 parts by weight of water, stir and mix evenly, and prepare dropwise;

[0040] Preparation of solution B: Weigh 0.30 parts by weight of L-ascorbic acid, 0.85 parts by weight of mercaptoacetic acid, 0.15 parts by weight of mercaptopropionic acid and 71 parts by weight of water, stir and mix evenly, and prepare dropwise;

[0041] Preparation of mixture C: Weigh 100 parts of unsaturated polyether DD-417 with a number average molecular weight of 1200, 1.00 parts of hydrogen peroxide (concentration: 30wt%) and 75 parts of water, put them into a polymerization reactor, stir evenly, and prepare for polymerization;

[0042] (2) Polymerization: Introduce protective gas nitrogen into the polymerization reactor that has been pu...

Embodiment 2～ Embodiment 5

[0046] According to the method and steps of Example 1, the slow-release polycarboxylate water-reducer of the present invention was prepared according to the formula in Table 1, and the obtained polycarboxylate water-reducer was added according to the amount shown in Table 1. In the cement paste and concrete, the performance data of the obtained cement paste and concrete are also shown in Table 1.

[0047] Table 1 (the dosage units of each component are parts by weight)

[0048]

[0049]

[0050] It can be seen from Table 1 that the slow-release polycarboxylate superplasticizer of the present invention has good slow-release properties, fluidity retention and slump retention.

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Abstract

The invention discloses a slow-release polycarboxylate water reducer, its preparation method and application method. The water reducer of the present invention includes 100 parts of unsaturated polyether DD-417, 6-9 parts of acrylic acid, 0-1.80 parts of methacrylic acid, 9.50-19.50 parts of hydroxyethyl acrylate, 0-5.40 parts of hydroxypropyl acrylate, and 0.90-0 parts of hydrogen peroxide. 1.10 parts, 0.20-0.40 parts of L-ascorbic acid, 0.55-0.95 parts of thioglycolic acid, 0.05-0.45 parts of mercaptopropionic acid, 0-8 parts of sodium hydroxide and 185-205 parts of water. The water reducer of the present invention can realize slow release, has good fluidity retention, meets the higher requirements for slump retention in engineering, has the advantages of low raw material cost, good performance, and one-step polymerization, and is suitable for slump reduction High-rise buildings, long-span bridges, offshore drilling platforms, tunnels, dams, airport construction and other projects that require high slump retention.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a slow-release polycarboxylate water reducer, a preparation method and a use method thereof. Background technique [0002] With the development of the construction industry, the requirements for water reducers in engineering applications are gradually increasing, and polycarboxylate water reducers that meet different construction requirements and application characteristics are the focus of research. Due to my country's vast territory, obvious seasonal changes, and large differences in concrete raw materials, the excessive slump loss of freshly mixed concrete has always been a problem that plagues normal construction and needs to be solved urgently. When the concrete mixture must be transported for a long time, especially in hot weather, it should be kept at the initial slump level as much as possible to ensure the smooth transportation, pumping and pouring of the conc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F290/06C08F220/28C08F220/06C08F4/40C08F2/38C04B24/26C04B103/30
Inventor 董建国罗琼李亚杰王振波张天水杜辉
Owner SHANGHAI DONGDA CHEM
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