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High water reduction high collapse protection type polycarboxylate high-performance water reducer and pyrogen-free preparation method thereof

A polycarboxylate-based, slump-preserving technology, which is applied in the field of preparation of polycarboxylate-based high-performance water reducers and water reducers, can solve the problems of cement adaptability, high production costs, and increased energy consumption. And equipment investment and other issues, to achieve the effect of cement wide adaptability, easy reaction process, workability and durability

Active Publication Date: 2010-12-29
大连华建科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In the polycarboxylic acid synthesis methods disclosed in the above-mentioned patents, steam or boiler heating is required, which increases energy consumption and equipment investment, and the production cost is high, and it is difficult to achieve the best effect on cement adaptability

Method used

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  • High water reduction high collapse protection type polycarboxylate high-performance water reducer and pyrogen-free preparation method thereof
  • High water reduction high collapse protection type polycarboxylate high-performance water reducer and pyrogen-free preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0032] Prepare high water-reducing and high-slump retention type polycarboxylate high-performance water-reducing agent according to the following raw material quantity and process, specifically:

[0033] The first step, material preparation: add 0.8 g of L-ascorbic acid to 20 g of deionized water, mix evenly, reserve tank A as material A; add 5.5 g of acrylic acid, 0.15 g of hydroxyethyl acrylate, and 0.2 g of thioglycolic acid, add 80 g In deionized water, mix evenly, and reserve the B tank, which is the B material;

[0034] The second step, polymerization: add 168 g of deionized water and unsaturated methyl alkenyl polyoxyethylene ether (M W =3000) 60 g, after fully dissolved by stirring, add H with a mass concentration of 30% 2 o 2 1 g and 0.2 g of potassium persulfate, stir evenly, keep the temperature to 20 ℃, add material A and material B dropwise at the same time, add material A dropwise for 3 hours, add material B dropwise for 2.5 hours, and keep warm for 3 hours af...

Embodiment 2

[0036] Prepare high water-reducing and high-slump retention type polycarboxylate high-performance water-reducing agent according to the following raw material quantity and process, specifically:

[0037] The first step, material preparation: Add 0.9 g of L-ascorbic acid to 20 g of deionized water, mix evenly, and reserve the A tank as material A; 7.25 g of acrylic acid, 0.45 g of itaconic acid, 2-acrylamide-2-methyl Add 0.13 g of propylene sulfonic acid and 0.65 g of sodium methpropylene sulfonate into 60 g of deionized water, mix evenly, and reserve tank B as material B;

[0038] The second step, polymerization: add 81 g of deionized water, unsaturated methyl alkenyl polyoxyethylene ether (M W =2400) 60 g, after fully dissolved by stirring, add 30% H 2 o 2 1.25 g, stir evenly, keep the temperature to 25 ℃, and continuously add materials A and B dropwise at the same time, add material A dropwise for 3.5 hours, add material B dropwise for 3 hours, and react for 3 hours after ...

Embodiment 3

[0040] Prepare high water-reducing and high-slump retention type polycarboxylate high-performance water-reducing agent according to the following raw material quantity and process, specifically:

[0041] The first step, material preparation: Add 0.4 g of sodium bisulfite to 20 g of deionized water, mix evenly, and use tank A for spare use, which is material A; 2.5 g of methacrylic acid, 7.5 g of maleic anhydride, 1.75 g of acrylamide, Add 0.25 g of sodium propylsulfonate to 40 g of deionized water, mix evenly, and reserve tank B for use as material B;

[0042] The second step, polymerization: add 50 g of deionized water and unsaturated methyl alkenyl polyoxyethylene ether (M W =2400) 60 g, after fully dissolved by stirring, add 0.8 g of ammonium persulfate, stir evenly, keep the temperature to 30 ℃, add A and B material dropwise at the same time, add material A dropwise for 4 hours, add material B dropwise for 3 hours, add material A dropwise After the dropwise addition, reac...

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Abstract

The invention belongs to the technical field of concrete additives in building materials. The high water reduction high collapse protection type polycarboxylate high-performance water reducer mainly comprises the following monomer components: unsaturated methyl vinyl polyoxyethylene ether (A), a chain transfer agent (B), a mixture (C) of one or more of unsaturated acid and unsaturated acid derivatives, an oxidant (D) and a reducing agent (E), wherein the molar ratio A: B: C: D: E of the monomers is 1:0.01-0.5:2-8:0.08-0.5:0.02-0.3. The high water reduction high collapse protection type polycarboxylate high-performance water reducer is prepared by regulating the polymer mass concentration to between 20 and 40 percent by using water, and polymerizing a redox initiator system at normal temperature. The water reducer has the advantages of low doping amount, high water reducing ratio, excellent slump retaining capacity, and high cement adaptability, and the technology has the advantages of no need of extra heat source, implementation at normal temperature, low equipment investment, low cost and suitability for large area popularization and application.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures in building materials, and in particular relates to a polycarboxylate high-performance water reducer. In addition, the invention also relates to a preparation method of the water reducer. Background technique [0002] Concrete is currently the most used construction material. Admixture is one of the essential components of modern concrete, and water reducer is the most widely used and used admixture. After adding water reducer to concrete, it can improve the workability of concrete, increase the strength of concrete and save cement. The research of high-efficiency water reducer has become an important branch of concrete material science, and promotes the development of the whole concrete material from low technology to high technology. At present, the high-efficiency water-reducing agents mainly of naphthalene, aliphatic and melamine commonly used in China have played an important ro...

Claims

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Application Information

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IPC IPC(8): C04B24/26C04B24/16C08F290/00C04B103/30
CPCC04B2103/302C04B24/283
Inventor 吴长龙荀武举张炜辛德胜王跃松王岳华
Owner 大连华建科技有限公司
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