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High-performance polycarboxylic acid water reducing agent and preparation method therefor

A technology of polycarboxylate and water reducer, which is applied in the field of high performance polycarboxylate water reducer and its preparation, can solve the problems of large resource consumption, high gas content of water reducer, unfavorable environmental protection and energy saving, etc. Gas content, increase effective molecular weight, and enhance the effect of slump retention function

Inactive Publication Date: 2017-06-20
南宁新泰瑞科建材股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since the current methods of preparing high-performance polycarboxylate water-reducing agents are mostly reacted under high temperature conditions, the consumption of resources is great, which is not conducive to environmental protection and energy saving
However, a few normal temperature preparation methods are difficult to solve the problems of high gas content and slump of water reducers, so there is an urgent need for a normal temperature preparation method of high performance polycarboxylate water reducers

Method used

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  • High-performance polycarboxylic acid water reducing agent and preparation method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Add 320g of methallyl alcohol polyoxyethylene ether and 300g of deionized water into a four-necked flask with a capacity of 1L, stir and dissolve, add 2.5g of azobisisobutyronitrile after the dissolution is complete, and add liquid A, B liquid and C liquid (the A liquid is made up of 30g acrylic acid, 16gN-vinylpyrrolidone and 62g deionized water; The B liquid is made up of 0.8g hanging white block, 0.6g glucose, 3.6g thioglycolic acid and 80g deionized water Composition; described C liquid is made up of 2.5g ammonium persulfate and 84g deionized water). Add liquid A dropwise for 3.0 hours, and add liquid B and C dropwise for 3.5 hours. If the system temperature exceeds 45°C during the dropwise addition, you need to turn on the cooling system to keep the temperature in the reactor at 42-45°C. After the dropwise addition, mature for 2 hours, then add 15g of sodium hydroxide for neutralization, supplement 112g of deionized water to adjust the resulting product to 40% soli...

Embodiment 2

[0027] Add 320g of methallyl alcohol polyoxyethylene ether and 300g of deionized water into a four-neck flask with a capacity of 1L, stir to dissolve, add 2.2g of ammonium persulfate after the dissolution is complete, and add A, B and C dropwise at the same time ten minutes later Liquid (the A liquid is made up of 33g acrylic acid, 5g vinyl acetate, 4g2-acrylamide-2-methylpropanesulfonic acid and 62g deionized water; the B liquid is made up of 1.8g vitamin C, 3.6g thioglycolic acid and 80g Composition of deionized water; the C liquid is composed of 3.5g concentration of 27.5% hydrogen peroxide and 84g deionized water). Add liquid A dropwise for 4 hours, and add liquid B and C dropwise for 4.5 hours. If the system temperature exceeds 45°C during the dropwise addition, you need to turn on the cooling system to keep the temperature in the reactor at 42-45°C. After the dropwise addition, mature for 2 hours, then add 15g of sodium hydroxide for neutralization, and add 36g of deioni...

Embodiment 3

[0029] Add 320g of methallyl alcohol polyoxyethylene ether and 300g of deionized water into a four-necked flask with a capacity of 1L, stir and dissolve, add 2.2g of ammonium persulfate after the dissolution is complete, and add liquid A, liquid B and C solution (the A solution is composed of 30.2g acrylic acid, 4g2-acrylamide-2-methylpropanesulfonic acid, 12g4-vinylpyridine and 62g deionized water; the B solution is composed of 1.8g vitamin C, 3.2g mercapto Acetic acid and 80g deionized water; the C solution is composed of 3.5g concentration of 27.5% hydrogen peroxide and 84g deionized water). A solution was added dropwise for 4 hours, B solution and C solution were added dropwise for 4.5 hours, after the dropwise addition was completed, it was aged for 2 hours, then 15g of sodium hydroxide was added for neutralization, and 33g of deionized water was added to adjust the obtained product to 40% solid content. That is, the finished product PC-3 of the polycarboxylic acid high-p...

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Abstract

The invention discloses a high-performance polycarboxylic acid water reducing agent and a preparation method therefor. The water reducing agent comprises the following ingredients in parts by weight: 300-350 parts of macromonomer, 38-50 parts of agent A, 2.5-5.5 parts of agent B, 4.8-5.8 parts of agent C and 550-650 parts of deionized water, wherein the macromonomer is any one or a mixture of both of methyl allyl alcohol polyoxyethylene ether and isopentenol polyoxyethylene ether; the agent A comprises acrylic acid or a mixture of acrylic acid and at least one of micromonomers; the micromonomers comprise one or several of acrylamide, methacrylic acid, maleic acid, N-vinyl pyrrolidone, 4-vinyl pyridine, fumaric acid, vinyl acetate, 2-acrylamide-2-methyl propanesulfonic acid and sodium methylallylsulfonate; the agent B comprises 1.2-1.8 parts by weight of reducing agent and 1.5-3.6 parts by weight of chain transfer agent; and the agent C is an initiator. The high-performance polycarboxylic acid water reducing agent disclosed by the invention has high water reducing rate and good slump retaining capability, the entrained air volume is lower than that of commercially available products, and the whole production process has no need of heating and is energy-saving and environmentally friendly.

Description

technical field [0001] The invention relates to a high-performance polycarboxylate water reducer and a preparation method thereof. Background technique [0002] With the vigorous development of my country's infrastructure construction, the performance of all aspects of concrete necessary for infrastructure construction is also constantly improving, and at the same time, the requirements for concrete water reducing agents are also getting higher and higher. Polycarboxylate superplasticizer is the third generation of high-performance superplasticizer, which has the characteristics of low dosage, high water reducing rate, small slump loss, and good adaptability to cement. Polycarboxylate water reducer can greatly increase the amount of mixed materials such as fly ash and mineral powder. It is green and environmentally friendly, can greatly save cement, and has the advantages of high-strength and ultra-high-strength concrete. It is widely used in commercial concrete, high-streng...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C08F226/10C08F218/08C08F220/58C08F226/06C08F220/56C04B24/26C04B24/16C04B103/30
CPCC08F283/065C04B24/165C04B24/2694C04B2103/302C08F220/06
Inventor 畅佳超徐元仲程勇维王楠
Owner 南宁新泰瑞科建材股份有限公司
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