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Method for preparing polycarboxylic acid water reducer by itaconic acid waste liquid

A technology of itaconic acid and polycarboxylic acid, which is applied in the field of preparing polycarboxylate water reducing agent, can solve the problems of high price, large effect and low dosage, and achieves improvement of conversion rate, retention capacity and retardation time. Effect

Inactive Publication Date: 2018-09-28
萧县沃德化工科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Polycarboxylate admixture is a material added before or during concrete mixing to improve the performance of freshly mixed and hardened concrete. It is characterized by small dosage and great effect, and is an indispensable component in concrete proportioning. Part, it accounts for more than 80% of all water reducing agents. The main raw material acrylic acid and its derivatives are used in the synthesis process, but its price is expensive. Some synthesis processes also use itaconic acid, but its price is similar to that of acrylic acid

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  • Method for preparing polycarboxylic acid water reducer by itaconic acid waste liquid

Examples

Experimental program
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Effect test

Embodiment 1

[0019] A kind of method utilizing itaconic acid waste liquid to prepare polycarboxylate water reducer, comprises the following steps:

[0020] (1) Evenly mix 23 parts of acrylic acid and 2 parts of mercaptopropionic acid, and add 50 parts of deionized water to it, stir and dissolve to obtain solution A; add 3.2 parts of deionized water to 1.6 parts of vitamin C, stir and mix to obtain Solution B;

[0021] (2) 320 parts of methallyl polyoxyethylene ether, 3.7 parts of mass concentration are 27.5% hydrogen peroxide and 647.4 parts of deionized water as base materials and 65 parts of itaconic acid waste liquid are dropped into the reactor simultaneously, Stir until completely dissolved to obtain mixed liquid A;

[0022] (3) Add solution A and solution B dropwise to mixed solution A. Solution A is added dropwise in 2 hours, and solution B is added dropwise in 2.5 hours. After solution B is added dropwise, continue to stir and react for 50 minutes to obtain a mixed solution B;

...

Embodiment 2

[0026] A kind of method utilizing itaconic acid waste liquid to prepare polycarboxylate water reducer, comprises the following steps:

[0027] (1) Evenly mix 22 parts of acrylic acid and 2.5 parts of mercaptopropionic acid, and add 36.75 parts of deionized water to it, stir and dissolve to obtain solution A; add 1.8 parts of deionized water to 1.2 parts of vitamin C, stir and mix to obtain Solution B;

[0028] (2) 310 parts of methallyl polyoxyethylene ether, 4 parts of mass concentration are 25% hydrogen peroxide and 471 parts of deionized water as base materials and 50 parts of itaconic acid waste liquid are dropped into the reactor simultaneously, Stir until completely dissolved to obtain mixed liquid A;

[0029] (3) Add solution A and solution B dropwise to mixed solution A. Solution A is added dropwise in 2 hours, and solution B is added dropwise in 2.5 hours. After solution B is added dropwise, continue to stir and react for 40 minutes to obtain a mixed solution B;

...

Embodiment 3

[0033] A kind of method utilizing itaconic acid waste liquid to prepare polycarboxylate water reducer, comprises the following steps:

[0034] (1) Evenly mix 24 parts of acrylic acid and 2.2 parts of mercaptopropionic acid, and add 65.5 parts of deionized water to it, stir and dissolve to obtain solution A; add 5 parts of deionized water to 2 parts of vitamin C, stir and mix to obtain Solution B;

[0035] (2) 300 parts of methallyl polyoxyethylene ether, 3 parts of mass concentration are 26.5% hydrogen peroxide and 757.5 parts of deionized water as base materials and 75 parts of itaconic acid waste liquid are dropped into the reactor simultaneously, Stir until completely dissolved to obtain mixed liquid A;

[0036] (3) Add solution A and solution B dropwise to mixed solution A. Solution A is added dropwise in 2 hours, and solution B is added dropwise in 2.5 hours. After solution B is added dropwise, continue to stir and react for 60 minutes to obtain a mixed solution B;

[...

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Abstract

The invention discloses a method for preparing a polycarboxylic acid water reducer by itaconic acid waste liquid. The water reducer is prepared from, by weight, 290-340 parts of methyl allyl polyoxyethylene ether, 3-4.5 parts of hydrogen peroxide, 20-25 parts of acrylic acid, 50-80 parts of itaconic acid waste liquid, 1.2-2.5 parts of mercapto-propionic acid and 1.2-2 parts of vitamin C. Accordingto the synthesis method of the water reducer, free radical polymerization is triggered by an oxidation-reduction system, reaction can be performed at room temperature, the dosage of the acrylic acidin the polymerization process is reduced, the itaconic acid waste liquid contains delayed coagulation components, addition of the delayed coagulation components in the final-period water reducer is reduced, the slump holding capacity of concrete can be improved, the ratio of oxidizing agents to reducing agents is adjusted, the dosage of all monomers is determined, conversion rate is increased, rawmaterial waste is prevented, and side reaction is effectively controlled. The water reducer has high water reducing rate, good slump holding performance and wide applicable range and is suitable forindustrial large-scale production.

Description

technical field [0001] The invention relates to the field of water reducer synthesis, in particular to a method for preparing polycarboxylate water reducer by utilizing itaconic acid waste liquid. Background technique [0002] Since the polycarboxylate admixture product was first used in the Shanghai Maglev Project in 2001 in China, the polycarboxylate admixture has developed very rapidly in terms of technology and market size in just 6-7 years. Judging from the development and application characteristics of polycarboxylate superplasticizers in recent years, the current application trend of polycarboxylate superplasticizers is from the application of key parts of major projects in the past to the application of general major projects and general projects. High-strength grade, special function concrete is gradually applied to ordinary concrete. At present, it is designated as the only admixture type in almost all national major and key projects, high-speed rail projects, wat...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C08F222/02C04B24/26C04B103/30
CPCC04B24/2694C04B2103/302C08F283/065C08F220/06C08F222/02
Inventor 王浩雨马丽涛董翠平刘景相邢凯
Owner 萧县沃德化工科技有限公司
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