Slow-release type polycarboxylate water reducer, and preparation method and application method thereof

A slow-release polycarboxylic acid and water-reducing agent technology, applied in the field of building materials, can solve problems such as unsatisfactory slow-release effect, and achieve the effects of being beneficial to large-scale industrial production, good fluidity retention, and convenient operation.

Active Publication Date: 2014-03-12
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 existin

Method used

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  • Slow-release type polycarboxylate water reducer, and preparation method and application method thereof
  • Slow-release type polycarboxylate water reducer, and preparation method and application method thereof

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 type polycarboxylate water reducer, and a preparation method and an application method thereof. The water reducer comprises, in parts by weight, 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, 0.90-1.10 parts of hydrogen peroxide, 0.20-0.40 part of L-ascorbic acid, 0.55-0.95 part of thioglycolic acid, 0.05-0.45 part of mercaptopropionic acid, 0-8 parts of sodium hydroxide and 185-205 parts of water. The water reducer provided by the invention helps to realize slow release, is good in fluidity maintenance property, can satisfy the relatively high requirements on slump maintenance property during engineering, has the advantages of being low in raw material cost, good in properties, obtained by one-step polymerization and the like, is applicable to construction engineering such as high-rise buildings, wide-span bridges, sea drilling platforms, tunnels, dams, airports and the like which require high slump maintenance property.

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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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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