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Preparation method of low-cost polycarboxylate water reducer

A technology of polycarboxylic acid and water reducing agent, which is applied in the field of concrete admixture and building materials, can solve the problems of complex performance degradation process of water reducing agent, unfavorable large-scale production, complicated production steps, etc., to avoid rapid reduction of reactivity, The preparation process and required equipment are simple and the effect of strong reactivity

Inactive Publication Date: 2018-08-28
桦南县奇龙新型建筑材料制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the whole, its production steps are relatively complicated, which is not conducive to large-scale production, and the water reducing rate of the product is lower than that of polycarboxylate water reducer
[0007] The above patents all try to introduce starch into the production and use of water reducing agent, and directly replace the polyether macromonomer with the treated starch, but none of them can solve the problems caused by the deterioration of the performance of the water reducing agent and the complicated process.

Method used

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  • Preparation method of low-cost polycarboxylate water reducer
  • Preparation method of low-cost polycarboxylate water reducer

Examples

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Effect test

Embodiment 1

[0030] A kind of preparation method of low-cost polycarboxylate water reducer, it is characterized in that, comprises the following steps:

[0031] 1) Add 270 parts of allyl polyoxyethylene ether, 75 parts of Kewei chemical industrial grade carboxymethyl starch, 15 parts of acrylic acid and 300 parts of water into the reaction kettle, stir to dissolve;

[0032] 2) Measure the temperature in the kettle, control the temperature at 55°C, and after the temperature is stable, add 1.5 parts of hydrogen peroxide at one time;

[0033]3) After adding hydrogen peroxide for 5 minutes, start to drop the initiator and the small monomer solution in sequence. After the initiator is added, start to add the small monomer solution dropwise within 10 minutes. The small monomer solution dripping time is 5.5 hours, and the initiator dropping time It was 6 hours; the initiator was made up of 1.5 parts of thioglycolic acid, 0.4 parts of vitamin C and 120 parts of water, and the small monomer solutio...

Embodiment 2

[0036] A kind of preparation method of low-cost polycarboxylate water reducer, it is characterized in that, comprises the following steps:

[0037] 1) Add 273 parts of methallyl polyoxyethylene ether, 80 parts of Yanxing chemical industrial grade carboxymethyl starch, 13 parts of acrylic acid and 280 parts of water into the reaction kettle, stir to dissolve;

[0038] 2) Measure the temperature in the kettle and control the temperature at 54°C. After the temperature is stable, add 1.8 parts of hydrogen peroxide at one time;

[0039] 3) After adding hydrogen peroxide for 5 minutes, start to drop the initiator and the small monomer solution in sequence. After the initiator is added, start to add the small monomer solution dropwise within 10 minutes. The small monomer solution is added for 6 hours, and the initiator is added. It was 6.5 hours; the initiator was made up of 1.3 parts of thioglycolic acid, 0.5 parts of vitamin C and 110 parts of water, and the small monomer solution ...

Embodiment 3

[0042] A kind of preparation method of low-cost polycarboxylate water reducer, it is characterized in that, comprises the following steps:

[0043] 1) Add 293 parts of vinyl butyl ether polyoxyethylene ether, 55 parts of Xinglei chemical industrial grade carboxymethyl starch, 11 parts of acrylic acid and 250 parts of water into the reaction kettle, stir to dissolve;

[0044] 2) Measure the temperature in the kettle, control the temperature at 53°C, and after the temperature is stable, add 2.5 parts of hydrogen peroxide at one time;

[0045] 3) After adding hydrogen peroxide for 5 minutes, start to drop the initiator and the small monomer solution in sequence. After the initiator is added, start to add the small monomer solution dropwise within 10 minutes. The small monomer solution is added for 5 hours, and the initiator is added. It was 5.5 hours; the initiator was made up of 1.1 parts of thioglycolic acid, 0.6 parts of vitamin C and 100 parts of water, and the small monomer ...

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Abstract

The invention provides a preparation method of a low-cost polycarboxylate water reducer. The method comprises the following steps: firstly, adding polyether macromonomer, anionic starch ether, acyclicacid and water with a certain ratio into a reaction kettle, and stirring to enable the materials to be dissolved; secondly, controlling the temperature to be 50 to 55 DEG C, and beginning adding a certain amount of hydrogen peroxide; thirdly, sequentially beginning dropwise adding an initiator and a small monomer solution 5 min after the hydrogen peroxide is added, beginning dropwise adding the small monomer solution within 10 min after the initiator is added, and ensuring that the dropwise adding time of the small monomer solution is an hour and the dropwise adding time of the initiator is aplus 0.5 hour; ensuring that the initiator comprises mercaptoacetic acid, vitamin C and water with a certain ratio and the small monomer solution comprises acyclic acid and water with a certain ratio; fourthly, putting sodium hypophosphite hydrate into a system after dropwise adding is accomplished, keeping the temperature to be constant, performing curing for b hours, slowly adding caustic sodaliquid when the temperature is smaller than 30 DEG C, adjusting the pH value to be 5.0, supplementing water, andduniformly stirring, so as to obtain the low-cost polycarboxylate water reducer.

Description

technical field [0001] The invention belongs to the technical field of building materials, relates to the field of concrete admixtures, in particular to a preparation method of a low-cost polycarboxylate water reducer. Background technique [0002] High-performance concrete is essential in the field of modern construction, and water reducing agent is an indispensable admixture when preparing high-performance concrete. With the continuous development of concrete technology and the pursuit of green environmental protection in social development, people's demand for new green concrete superplasticizers is becoming more and more urgent. On the other hand, polyether macromonomer is the main raw material of water reducer, and its price cost also occupies most of the cost of polycarboxylate water reducer, and with the supply of polyether macromonomer raw materials such as ethylene oxide The tension of the production of polycarboxylate superplasticizers has also been pushed up. Fo...

Claims

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Application Information

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IPC IPC(8): C08F291/06C08F291/08C08F220/06C04B24/26C04B103/30
CPCC04B24/2605C04B2103/302C08F251/00C08F283/065C08F220/06
Inventor 柯凯罗正权
Owner 桦南县奇龙新型建筑材料制造有限公司