A kind of preparation method of high performance water reducer

A high-performance, water-reducing agent technology, applied in the field of preparation of polycarboxylate high-performance water-reducing agent, can solve the problems that the polymer cannot obtain a comb-shaped molecular structure, the polymerization reaction is difficult to control, and the performance of the water-reducing agent is poor. , achieve the effect of shortening the polymerization reaction time, simple process and high water reducing rate

Inactive Publication Date: 2011-12-21
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

The disadvantages of the above preparation method are: the initiator persulfate and hydrogen peroxide have low initiating activity, high reaction temperature (70-90°C), long reaction time (6-8 hours), difficult polymerization control, and low conversion rate , the polymer cannot obtain the ideal comb-shaped molecular structure, and the performance of the prepared water reducer is poor; the use of mercapto compounds as chain transfer agents is highly toxic and has a strong pungent smell, which is likely to cause environmental pollution during production and application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] In a 1000ml flask equipped with a stirrer, thermometer, dropping funnel and condenser, add 300g methallyl polyoxyethylene ether (n=25), 20g sodium methacrylate, 2g sodium sulfite and 160g deionized water. Stir and pass nitrogen protection, when the temperature rises to 50°C, start dropwise adding an aqueous solution consisting of 55g of acrylic acid and 37g of deionized water and an aqueous solution of 4.5g of sodium persulfate and 85g of deionized water. The acrylic acid aqueous solution was dropped in 2.5 hours, and the sodium persulfate aqueous solution was dropped in 3 hours. After the dropwise addition, continue to keep warm for 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 45% to obtain the target product in a light yellow viscous aqueous solution. The test results of water-reducing rate and slump of the concrete are shown in Table 1.

[0039]

Embodiment 2

[0041]In a 1000ml flask equipped with a stirrer, a thermometer, a dropping funnel and a condenser, add 300g of methallyl polyoxyethylene ether (n=50), 10.5g of sodium methacrylsulfonate, 2g of sodium sulfite and 160g of ionized water. Stir and pass nitrogen protection, when the temperature rises to 30°C, start dropwise adding an aqueous solution consisting of 30g of acrylic acid and 20g of deionized water and an aqueous solution of 4.5g of sodium persulfate and 85g of deionized water. The acrylic acid aqueous solution was dropped in 2.5 hours, and the sodium persulfate aqueous solution was dropped in 3 hours. After the dropwise addition, continue to keep warm for 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 45% to obtain the target product in a light yellow viscous aqueous solution. The test results of water-reducing rate and slump of the concrete are shown in Table 1.

[0042]

Embodiment 3

[0044] In a 1000ml flask equipped with a stirrer, thermometer, dropping funnel and condenser, add 300g methallyl polyoxyethylene ether (n=75), 7g sodium methacrylate, 2g sodium sulfite and 160g deionized water. Stir and pass nitrogen protection, when the temperature rises to 60°C, start dropwise adding an aqueous solution consisting of 20g of acrylic acid and 13g of deionized water and an aqueous solution of 4.5g of sodium persulfate and 85g of deionized water. The acrylic acid aqueous solution was dropped in 2.5 hours, and the sodium persulfate aqueous solution was dropped in 3 hours. After the dropwise addition, continue to keep warm for 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 45% to obtain the target product in a light yellow viscous aqueous solution. The test results of water-reducing rate and slump of the concrete are shown in Table 1.

[0045]

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PUM

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Abstract

A preparation method of a polycarboxylate high-performance water reducer, under the protection of an inert gas and under the action of an oxidation-reduction initiation system and a chain transfer agent, the active macromonomer A (methallyl poly Oxyethylene ether), small molecule monomer B (methacrylic acid or acrylic acid) and small molecule monomer C (sodium methacrylate, sodium propylene sulfonate or sodium styrene sulfonate) are prepared by copolymerization in water. The invention adopts a highly active oxidation-reduction initiation system, which can increase the polymerization reaction rate, lower the polymerization temperature and shorten the reaction time, and the polymer has an ideal molecular structure. The water reducing agent prepared by the invention has excellent properties such as high water reducing rate, good dispersibility, no loss of slump over time, and high concrete strength; at the same time, the method of the invention adopts copolymerization reaction in water, the preparation process is simple, and it also has green Environmental protection, low energy consumption, low cost and other characteristics.

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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IPC IPC(8): C08F290/06C08F220/06C08F228/02C08F212/14C08F4/40C08F2/38C04B24/16C04B103/30
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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