Preparation method for polycarboxylate high-performance water reducer

A polycarboxylate, high-performance technology, applied in the field of preparation of polycarboxylate high-performance water reducing agent, achieves the effects of convenient operation, low energy consumption and high water reducing rate

Inactive Publication Date: 2011-11-16
江苏天音化工有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a kind of preparation method of polycarboxylate high-performance water reducer, to solve the above-mentioned problems existing in the prior preparation technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Prepare the following solutions:

[0035] A solution: composed of 200g polyethylene glycol monomethyl ether (polymerization degree n=23) methacrylate, 46g methacrylic acid and 170g deionized water.

[0036] Solution B: composed of 5g sodium persulfate and 100g deionized water.

[0037] In the 1000ml flask equipped with stirrer, thermometer, dropping funnel and condenser, add 20g sodium styrene sulfonate, 2g sodium sulfite and 200g deionized water and pass into nitrogen protection. When the temperature rises to 50°C, start adding solution A and solution B dropwise, solution A drops in 3 hours, and solution B drops in 3.5 hours. After the dropwise addition, continue to keep warm for 0.5-1 hour, then cool down, neutralize with 30% sodium hydroxide solution to a pH value of 6-7, and add water to adjust the solid content to 20% to obtain the target product, which is light brown viscous thick aqueous solution. The test results of water-reducing rate and slump of the concre...

Embodiment 2

[0040] Prepare the following solutions:

[0041] A solution: composed of 200g polyethylene glycol monomethyl ether (polymerization degree n=34) methacrylate, 31g methacrylic acid and 170g deionized water.

[0042] Solution B: composed of 5g sodium persulfate and 100g deionized water.

[0043] In the 1000ml flask equipped with stirrer, thermometer, dropping funnel and condenser, add 14g sodium styrene sulfonate, 2g sodium sulfite and 200g deionized water and pass into nitrogen protection. When the temperature rises to 30°C, start adding solution A and solution B dropwise, solution A drops in 3 hours, and solution B drops in 3.5 hours. After the dropwise addition, continue to keep warm for 0.5-1 hour, then cool down, neutralize with 30% sodium hydroxide solution to a pH value of 6-7, and add water to adjust the solid content to 20% to obtain the target product, which is light brown viscous thick aqueous solution. The test results of water-reducing rate and slump of the concre...

Embodiment 3

[0046] Prepare the following solutions:

[0047] A solution: composed of 200g polyethylene glycol monomethyl ether (polymerization degree n=45) methacrylate, 23g methacrylic acid and 170g deionized water.

[0048] Solution B: composed of 5g sodium persulfate and 100g deionized water.

[0049] In the 1000ml flask equipped with stirrer, thermometer, dropping funnel and condenser, add 10.5g sodium styrene sulfonate, 2g sodium sulfite and 200g deionized water and pass into nitrogen protection. When the temperature rises to 40°C, start adding solution A and solution B dropwise, solution A drops in 3 hours, and solution B drops in 3.5 hours. After the dropwise addition, continue to keep warm for 0.5 to 1 hour, then cool down, neutralize with 30% sodium hydroxide solution to a pH value of 7 to 8, and add water to adjust the solid content to 20% to obtain the target product, which is light brown viscous thick aqueous solution. The test results of water-reducing rate and slump of the ...

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Abstract

Provided is a preparation method for a polycarboxylate high-performance water reducer. The water reducer is prepared by copolymerization reaction of macromolecule monomer methoxy polyethylene glycol mono(meth) acrylate ester, small molecule monomer (meth)acrylic acid and sodium styrene sulfonate in an aqueous solution under the protection of inert gas and the action of a redox initiation system and a chain transferring agent. According to the invention, a high-activity redox initiation system is employed, which enhances the polymerization rate, reduces polymerization temperature, shortens reaction time, ensures non-hydrolysis of macro-molecular polyester monomers in the process of polymerization and a high conversion rate of raw materials, and guarantees that polymers have long side chains arraying at uniform intervals and an ideal comb shaped molecular structure. The water reducer prepared in the invention has the characteristics of a high water-reducing rate, a small slump loss and the like, and enables concrete with the water reducer to have high strength; simultaneously, the copolymerization reaction is carried out in water in the method, and therefore the method has the characteristics of simple preparation technology, environmental protection, low cost, etc.

Description

technical field [0001] The invention relates to a preparation method of a concrete water reducer, in particular to a preparation method of a polycarboxylate high-performance water reducer. Background technique [0002] Water reducer is the most important admixture used in concrete. It can greatly improve the performance of freshly mixed concrete, improve the slump retention, workability and fluidity of the concrete mixture, and at the same time reduce the water consumption of the mixture to increase the strength and durability of the concrete. [0003] The first-generation common water reducer represented by wood calcium and the second-generation high-efficiency water reducer represented by naphthalene series and melamine have high dosage, low water reducing rate, large slump loss, Low concrete strength, poor adaptability with cement and other admixtures; at the same time, traditional water reducers such as naphthalene and melamine are formaldehyde condensates. During produ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F290/06C08F220/06C08F212/14C08F4/40C04B24/20C04B103/30
Inventor 秦怡生徐平陈荣福杨建国
Owner 江苏天音化工有限公司
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