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A method for preparing polycarboxylate water reducer at room temperature under alkaline conditions

A technology of alkaline conditions and polycarboxylic acid, applied in the field of building materials, can solve the problems of inapplicability, failure to develop, and reduced reducibility in occasions requiring early strength, and achieve simplified material preparation and production operations, and easy operation , the effect of high conversion rate

Active Publication Date: 2021-09-28
ZHENJIANG SOBUTE NEW MATERIAL CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN102952243B has reported the method that uses tartaric acid as chain transfer agent to prepare polycarboxylate superplasticizer, although tartaric acid is nontoxic, has certain retarding effect as hydroxyorganic acid, is not applicable to the occasion that early strength is required
This may be due to the fact that the tertiary amine is gradually protonated after the acidic monomer is dropped, and the reducibility is greatly reduced, which leads to a decrease in the initiation activity; this makes the system fail to take advantage of the normal temperature initiation.

Method used

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  • A method for preparing polycarboxylate water reducer at room temperature under alkaline conditions
  • A method for preparing polycarboxylate water reducer at room temperature under alkaline conditions
  • A method for preparing polycarboxylate water reducer at room temperature under alkaline conditions

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Effect test

Embodiment 1

[0038] 5 parts of quality triisopropanolamine, 3.3 parts of quality potassium bicarbonate and 50% HPEG-6000 solution containing 150 parts of quality of HPEG-6000 are added to the reactor, and 57 parts of quality of water are added to make the quality of polyethylene glycol The concentration is 40%. Afterwards, stir until all ingredients are well mixed and dissolved to the maximum extent.

[0039] At 25 degrees, 14.8 parts of quality of 10% sodium persulfate solution D-1 and 37.3 parts of quality of acrylic acid containing 5.8 parts of quality, 2.3 parts of quality of hydroxyethyl acrylate and 5 parts of quality of triisopropanol were added dropwise at a constant speed. The dropping time of the amine solutions E-1 and D-1 is 1 h, and the dropping time of E-1 is 45 min. After dropping, keep warm for 1 hour, and then adjust the pH of the system to 6-8 with dilute nitric acid to obtain early-strength polycarboxylate superplasticizer P-1.

Embodiment 2

[0041] Add 9 parts by mass of monoethanol diisopropanolamine, 3.9 parts by mass of sodium hydroxide and 150 parts by mass of TPEG-5000 solid into the reactor, and add 127.8 parts by mass of water to make the mass concentration of polyethylene glycol at 50%. Afterwards, stir until all ingredients are well mixed and dissolved to the maximum extent.

[0042] At 25 degrees, 25 parts of mass of 8% sodium persulfate solution D-2 and 67.6 parts of mass of acrylic acid containing 11.7 parts of mass, 3.7 parts of mass of 2-acrylamide-2-methylpropanesulfonic acid and The solution E-2 of 6 parts by mass of monoethanol diisopropanolamine, the dropping time of D-2 is 80 minutes, and the dropping time of E-2 is 60 minutes. After dripping, keep it warm for 1 hour, and then adjust the pH of the system to 6-8 with dilute nitric acid to obtain early-strength polycarboxylate superplasticizer P-2.

Embodiment 3

[0044] 6 parts of quality triisopropanolamine, 9.1 parts of quality potassium hydroxide and a 70% APEG-4000 solution containing 100 parts of quality APEG-4000 are added to the reactor, and 169.3 parts of quality water are added to make the quality of polyethylene glycol The concentration is 30%. Afterwards, stir until all ingredients are well mixed and dissolved to the maximum extent.

[0045] At 35 degrees, 22.3 parts by mass of 6% sodium persulfate solution D-3 and 63.9 parts by mass of acrylic acid containing 12.2 parts by mass, 4.1 parts by mass of 2-acrylamide-2-methylpropanesulfonic acid, The solution E-3 of 1 mass of maleic anhydride and 6 mass of triisopropanolamine, the dropping time of D-3 is 2h15min, and the dropping time of E-3 is 2h. After dripping, keep it warm for 1.5 hours, then adjust the pH of the system to 6-8 with dilute nitric acid to obtain the early-strength polycarboxylate superplasticizer P-3.

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Abstract

The invention belongs to the technical field of building materials, in particular to a method for preparing a polycarboxylate water reducer at room temperature under alkaline conditions. Reduction initiation system reducing component, chain transfer agent and early strength component; using long-chain polyethylene glycol with unsaturated double bonds, acrylic acid, and auxiliary regulating monomers as raw materials to prepare polycarboxylic acid reducer with early strength Aqua. The method of the present invention is different from the traditional polycarboxylate superplasticizer preparation method usually carried out under weakly acidic conditions. The four-in-one effect of the blender and the early strength component not only simplifies the types of materials, facilitates the operation, but also avoids the use of toxic and odorous mercapto compounds, and the preparation process is more environmentally friendly.

Description

technical field [0001] The invention belongs to the technical field of building materials, in particular to a method for preparing a polycarboxylate water reducer at normal temperature under alkaline conditions. Background technique [0002] Polycarboxylate high-performance water-reducer is a kind of concrete water-reducer with the best performance and the best prospect at present, and it is widely used in various large-scale projects that have high requirements for concrete performance. The preparation process of polycarboxylic acid is related to the production efficiency and performance of the obtained water reducer, and has always been a key topic in the development of polycarboxylic acid. At present, the production of polycarboxylic acid is mainly based on free radical polymerization. In free radical polymerization, the initiation of polymerization reaction is one of the core links in the preparation process of polycarboxylic acid. At present, the synthesis process of p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F220/06C08F220/20C04B24/26C04B103/30
CPCC04B24/2605C04B2103/302C08F283/065C08F220/06
Inventor 严涵周栋梁杨勇于诚张建纲毛永琳冉千平刘加平
Owner ZHENJIANG SOBUTE NEW MATERIAL CO LTD