Polycarboxylate water reducer containing modified water-soluble acrylate and preparation method thereof

An acrylate and water-soluble technology, which is applied in the field of building materials and water reducing agents, can solve the problems of sensitive dosage, poor mud tolerance, etc., and achieve the effects of enhanced fluidity, high water reducing rate, and prolonged setting time

Active Publication Date: 2014-08-13
SHANXI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The polymerized polycarboxylate superplasticizer has good performance, high water reducing rate, good retention effect, and good adaptability to cement, but this type of product has high requirements for concrete materials, is sensitive to the dosage, and is resistant to mud poor force

Method used

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  • Polycarboxylate water reducer containing modified water-soluble acrylate and preparation method thereof
  • Polycarboxylate water reducer containing modified water-soluble acrylate and preparation method thereof
  • Polycarboxylate water reducer containing modified water-soluble acrylate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] In a 500ml reaction flask equipped with a stirrer and a condenser, add 205g of acrylic acid, 144g of glucose, 4.4g of hydroquinone, and 6.88g of p-toluenesulfonic acid, and stir at room temperature for 10 minutes, but the raw materials are not completely dissolved. Heat slowly, and when the temperature rises to 80-90°C, the solution becomes clear and all the raw materials are dissolved. Continue to heat up, starting at 90°C, the color of the reaction solution turns yellow, and gradually turns dark brown, within 1 hour the temperature is raised to 95-100°C and maintained, and the stirring is continued for 4-5 hours to obtain a small water-soluble glucose acrylate monomer.

[0038] Add 180g of methallyl polyoxyethylene ether (4-carbon macromonomer) with an average molecular weight of 2500 into 99g of deionized water, heat properly and fully dissolve to make a reaction bottom liquid; Add 54.4g of glucose ester, 10.8g of acrylic acid, and 1.48g of thioglycolic acid into 62....

Embodiment 2

[0040] In a 500ml reaction flask equipped with a stirrer and a condenser, add 205g of acrylic acid, 144g of glucose, 4.4g of hydroquinone, and 6.88g of p-toluenesulfonic acid, and stir at room temperature for 10 minutes, but the raw materials are not completely dissolved. Heat slowly, and when the temperature rises to 80-90°C, the solution becomes clear and all the raw materials are dissolved. Continue to heat up, starting at 90°C, the color of the reaction solution turns yellow, and gradually turns dark brown, within 1 hour the temperature is raised to 95-100°C and maintained, and the stirring is continued for 4-5 hours to obtain a small water-soluble glucose acrylate monomer.

[0041] Add 180g of isoprenyl polyoxyethylene ether (5-carbon macromonomer) with an average molecular weight of 5000 into 99g of deionized water, heat properly and fully dissolve to make a reaction bottom liquid; Add 35.2g of glucose ester and 1.48g of thioglycolic acid into 62.5g of deionized water in...

Embodiment 3

[0043]Add 233.6g of acrylic acid, 145.6g of sorbitol, 5g of p-methoxyphenol, and 7.12g of p-toluenesulfonic acid into a 500ml reaction flask equipped with a stirrer and a condenser, and stir at room temperature for 10 minutes, but the raw materials are not completely dissolved. Heat slowly, and when the temperature rises to 80-90°C, the solution becomes clear and all the raw materials are dissolved. Continue to heat up, starting at 90°C, the color of the reaction solution turns yellow, and gradually turns dark brown, within 1 hour the temperature is raised to 105-110°C and maintained, and the stirring is continued for 4-5 hours to obtain a small water-soluble sorbitol acrylate monomer .

[0044] 180g of allyl polyoxyethylene ether (3-carbon macromonomer) with an average molecular weight of 2500 was added to 99g of deionized water, heated and fully dissolved to make a reaction bottom liquid; Add 61.2g of ester and 1.48g of thioglycolic acid into 62.5g of deionized water in tur...

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Abstract

The invention provides a polycarboxylate water reducer containing modified water-soluble acrylate and a preparation method thereof. The preparation method comprises the following steps: firstly, directly carrying out esterification reaction on polyhydroxy-alcohol carbohydrates and crylic acid so as to prepare modified water-soluble acrylate micromonomers; then putting polyether macromonomers into deionized water, and fully dissolving so as to prepare a reaction base solution; dissolving the acrylate micromonomers, crylic acid, an initiator vitamin C and a chain transfer agent mercaptoacetic acid into deionized water, so as to prepare drop concentrate; putting an initiator hydrogen peroxide into the reaction base solution, dropwise adding the drop concentrate into the reaction base solution at a constant speed, reacting while stirring, then regulating the pH value of the solution to be 7-8, so as to prepare the polycarboxylate water reducer. According to the preparation method, the regulating function of the polyhydroxy-alcohol carbohydrates is directly used in the water reducer, so that the property of the water reducer is optimized; the polycarboxylate water reducer prepared by the method has high water reducing rate, and the concrete is obviously improved in fluidity retainability and has less slump loss, so that the water reducer can meet higher construction requirements.

Description

technical field [0001] The invention relates to building materials, in particular to a water-reducer, and specifically belongs to a polycarboxylate water-reducer made of water-soluble acrylate modified by polyhydric alcohol carbohydrate esterification and a preparation method thereof. Background technique [0002] Water reducing agent is an essential component in modern concrete besides cement, sand, stone, water and admixtures. Water reducing agent is an admixture that reduces water consumption under the condition of ensuring the same workability of concrete mixture. The use of water reducing agent can reduce the amount of cement and improve the workability and durability of concrete. It is the core of ready-mixed concrete . It is generally believed that the development of water reducers is divided into three stages: the first generation of ordinary water reducers represented by wood calcium, the second generation of high-efficiency water reducers represented by naphthalen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F220/28C04B24/26C04B103/30
Inventor 裴继凯刘冠杰刘滇生王自为任建国
Owner SHANXI UNIV
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