Preparation method of viscosity-reducing type polycarboxylate water reducer

A technology of viscous polycarboxylic acid and water reducing agent, applied in the field of preparation of viscosity reducing polycarboxylate water reducing agent, can solve the problems of slow flow speed, long construction period, high viscosity, etc., to increase early strength, increase The effect of hydrophilic-lipophilic balance value

Active Publication Date: 2018-12-21
CHINA TIESIJU CIVIL ENG GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the use of a lower water-binder ratio and the increase in the proportion of some mineral admixtures, high-grade concrete has problems such as high viscosity and slow flow speed in application, resulting in long construction periods and prone to cold joints in poured materials.

Method used

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  • Preparation method of viscosity-reducing type polycarboxylate water reducer
  • Preparation method of viscosity-reducing type polycarboxylate water reducer
  • Preparation method of viscosity-reducing type polycarboxylate water reducer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Example 1: Take 300g of isopentenol polyoxyethylene ether with a molecular weight of 2400 and 360g of tap water into the bottom of the tank, turn on the stirring, stir and dissolve at 20°C, continue to add 27g of fumaric acid diethanolamide phosphate to the bottom of the tank , After the bottom material is dissolved into mixed solution A, add 1.2g of 30% hydrogen peroxide solution and stir and mix. After 5 minutes, add dropwise mixed solution B consisting of 36.77g maleic anhydride, 1.5g mercaptopropionic acid and 50g water. , And mixed solution C composed of 0.3g ascorbic acid and 100g water, mixed solution B dripping time 2.5h, mixed solution C dripping time 3h, after all the solutions are dripped, warm up to 25℃ and keep for 1.5h, react After finishing, slowly add 32% sodium hydroxide solution to neutralize the product pH to 7.

Embodiment 2

[0046] Example 2: Take 300g of isopentenol polyoxyethylene ether with a molecular weight of 2400 and 360g of tap water into the bottom of the tank, turn on the stirring, stir and dissolve at 25°C, continue to add 6.23g of fumaric acid diethanolamide phosphoric acid to the bottom of the tank After the bottom material is dissolved into mixed solution A, add 9g of sodium hypophosphite and stir to mix, then add 3.84g of ammonium persulfate and stir to mix, 10 minutes later, 14g of maleic anhydride and 75g of maleic anhydride are simultaneously added dropwise Mixed solution B composed of monomethyl ester and 50g water, and mixed solution C composed of 3.63g sodium formaldehyde sulfoxylate and 100g water, mixed solution B dripping time 3h, mixed solution C dripping time 3.5h, wait until all After all the solution was dripped, the temperature was raised to 30° C. and kept for 1 hour. After the reaction, 32% sodium hydroxide solution was slowly added to neutralize the pH of the product ...

Embodiment 3

[0047] Example 3: Take 300 g of isopentenol polyoxyethylene ether with a molecular weight of 2900 and 360 g of tap water into the bottom of the tank, turn on the stirring, stir and dissolve at 25°C, continue to add 15 g of fumaric acid diethanolamide phosphate to the bottom of the tank , After the bottom materials are dissolved into mixed solution A, add 3g ammonium persulfate and stir and mix. After 8 minutes, add dropwise a mixed solution consisting of 30g itaconic acid, 25g dimethyl itaconic acid, 2.5g thioglycolic acid and 50g water. B. And mixed solution C composed of 1.1g sodium formaldehyde sulfoxylate and 100g water, mixed solution B dripping time 3h, mixed solution C dripping time 3.5h, after all the solutions are dripped, the temperature is raised to 30 Keep the temperature at ℃ for 1h. After the reaction is over, slowly add 32% sodium hydroxide solution to neutralize the pH of the product to 8.

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Abstract

The invention provides a preparation method of a viscosity-reducing type polycarboxylate water reducer. The viscosity-reducing type polycarboxylate water reducer is obtained by free radical polymerization of TPEG monomers, unsaturated dibasic acid monomers or derivative monomers thereof, and viscosity-reducing assistants according to the mole ratio of 1:(3-6):(0.1-0.5) under the action of reducingagents, oxidizing agents and chain transfer agents, wherein the viscosity-reducing assistants are diethanolamide fumarate phosphate. The preparation method has the advantages that the unsaturated dibasic acid monomers or derivative monomers thereof, the diethanolamide fumarate phosphate and the TPEG monomers are subjected to copolymerization, the proportion of polar hydrophilic groups on molecular chains of the TPEG monomers can be increased through two carboxyl groups, introduced into the unsaturated dibasic acid monomers or derivative monomers thereof, and polar groups in the diethanolamidefumarate phosphate, such as ethanol, amide and phosphate groups, the hydrophilic-lipophilic balance of the water reducer is increased, and accordingly, the viscosity reducing effect of the water reducer is improved.

Description

Technical field [0001] The invention belongs to the field of preparation of concrete admixtures, and specifically relates to a preparation method of a viscosity-reducing type polycarboxylic acid water reducer. Background technique [0002] With the continuous development of my country's construction industry, high-grade concrete is being widely used due to its unique advantages of high strength, good integrity, and low weight. It is especially widely used in large-scale projects such as bridge engineering. There are obvious benefits in terms of sustainable development, safe use of the project, and adaptability to environmental conditions. Therefore, high-grade concrete has become an inevitable trend in the development of contemporary concrete technology. However, due to the use of a lower water-to-binder ratio and an increase in the mixing ratio of some mineral admixtures, high-grade concrete has problems such as high viscosity and slow flow in application, resulting in long const...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F230/02C08F222/06C08F222/16C08F222/02C08F222/14C04B24/26C04B103/30
CPCC04B24/246C04B2103/302C08F283/065C08F230/02C08F222/06C08F222/16C08F222/02C08F222/14
Inventor 汪志勇黄海林春红陈娟温建峰李双超汪春满许立李双崔云雾
Owner CHINA TIESIJU CIVIL ENG GRP CO LTD
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