Early-strength polycarboxylate superplasticizer and preparation method thereof

A technology of water reducing agent and polycarboxylic acid, applied in the field of early-strength polycarboxylate water reducing agent and its preparation, can solve the problems of prolonging the setting time of concrete and unfavorable early strength, and achieve shortening setting time, dense microstructure, The effect of increasing early strength

Active Publication Date: 2021-07-13
唐山冀东水泥外加剂有限责任公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the above-mentioned ordinary polycarboxylate superplasticizer has a certain retarding effect, prolongs the setting time of concrete, and is not conducive to the improvement of early strength, so it still needs to be improved

Method used

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  • Early-strength polycarboxylate superplasticizer and preparation method thereof
  • Early-strength polycarboxylate superplasticizer and preparation method thereof
  • Early-strength polycarboxylate superplasticizer and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0039] This application discloses an early-strength polycarboxylate water reducer, the raw materials include methallyl polyoxyethylene ether, acrylic acid, sodium methacrylic acid sulfonate, initiator, 1,2-benzisothiazole-3 -ketone, nano-gallium oxide, solvent and water, wherein the initiator is potassium persulfate, the solvent is benzyl benzoate, and the contents of each component are shown in Table 1 below.

[0040] A preparation method of an early-strength polycarboxylate water reducer, comprising the steps of:

[0041] Heat in a water bath to raise the temperature of 1,2-benzisothiazol-3-one to 50°C, and add the mixture obtained by mixing nano-gallium oxide and solvent into 1,2-benzisothiazol-3-one dropwise while stirring, After the dropwise addition is completed, keep warm and continue to stir for 1h to obtain the first mixture;

[0042] Mix methallyl polyoxyethylene ether, acrylic acid, and sodium methacrylic acid sulfonate, raise the temperature to 55°C, then add the ...

Embodiment 2

[0044] This application discloses an early-strength polycarboxylate water reducer, the raw materials include methallyl polyoxyethylene ether, acrylic acid, sodium methacrylic acid sulfonate, initiator, 1,2-benzisothiazole-3 -ketone, nano-gallium oxide, solvent and water, wherein the initiator is ammonium persulfate, the solvent is benzyl benzoate, and the contents of each component are shown in Table 1 below.

[0045] A preparation method of an early-strength polycarboxylate water reducer, comprising the steps of:

[0046] Heat in a water bath to raise the temperature of 1,2-benzisothiazol-3-one to 60°C, and add the mixture obtained by mixing nano-gallium oxide and solvent into 1,2-benzisothiazol-3-one dropwise while stirring, After the dropwise addition is completed, keep warm and continue to stir for 1.5h to obtain the first mixture;

[0047]Mix methallyl polyoxyethylene ether, acrylic acid, and sodium methacrylic acid sulfonate, raise the temperature to 65°C, then add the ...

Embodiment 3

[0049] This application discloses an early-strength polycarboxylate water reducer, the raw materials include methallyl polyoxyethylene ether, acrylic acid, sodium methacrylic acid sulfonate, initiator, 1,2-benzisothiazole-3 -ketone, nano-gallium oxide, solvent and water, wherein the initiator is potassium persulfate, the solvent is benzyl benzoate, and the contents of each component are shown in Table 1 below.

[0050] A preparation method of an early-strength polycarboxylate water reducer, comprising the steps of:

[0051] Heat in a water bath to raise the temperature of 1,2-benzisothiazol-3-one to 55°C, and add the mixture obtained by mixing nano-gallium oxide and solvent into 1,2-benzisothiazol-3-one dropwise while stirring, After the dropwise addition, keep warm and continue to stir for 1.2h to obtain the first mixture;

[0052] Mix methallyl polyoxyethylene ether, acrylic acid, and sodium methacrylic acid sulfonate, raise the temperature to 60°C, then add the initiator d...

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Abstract

The invention relates to the field of water reducing agents, and discloses an early-strength polycarboxylate superplasticizer and a preparation method thereof. The early-strength polycarboxylate superplasticizer is prepared from 10 to 15 parts of methylallylpolyoxyethylene ether, 25-30 parts of acrylic acid, 2-3 parts of sodium sulfonate methacrylate, 1-2 parts of an initiator, 4-5 parts of 1,2-benzisothiazole-3-one, 0.4-0.5 part of nanometer gallium oxide, 0.6-0.8 part of a solvent, and 50-60 parts of water. The preparation method comprises the following steps: mixing nanometer gallium oxide and a solvent, adding 1,2-benzisothiazole-3-one, and adding the mixture into a polycarboxylic acid polymer synthesized by other components to obtain the polycarboxylate superplasticizer. The preparation method has the advantages that the nanometer gallium oxide contains a microcosmic porous structure and can be better blended with 1,2-benzisothiazole-3-one after being mixed with a solvent, so a product adsorbing free carboxyl groups is obtained, the content of the free carboxyl groups capable of being complexed with calcium ions in a liquid phase is reduced, hydration is accelerated, coagulation time is shortened, water consumption is reduced, water film layers are decreased, and aggregate-cement interface structure is changed, so the early strength of concrete is better improved.

Description

technical field [0001] The present application relates to the field of water reducers, in particular to an early-strength polycarboxylate water reducer and a preparation method thereof. Background technique [0002] When preparing concrete with higher strength grades, high-performance water-reducing agents with high water-reducing rates are usually selected. Polycarboxylate superplasticizer has excellent properties such as high water reducing rate, obvious reinforcement effect, and low slump loss of concrete mixture, and has become a hot spot in the research and development of superplasticizers at home and abroad. [0003] At present, the patent with the publication number CN106348635A discloses a polycarboxylate water reducer, which is composed of the following raw materials in parts by weight: 10-15 parts of isobutenol polyoxyethylene ether, 5-8 parts of tartaric acid, 1- 3 parts, 0.5-2 parts of sodium methacrylate, 1-2 parts of paraben preservatives, 10-20 parts of water...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/16C04B22/06C04B22/12C04B22/08C04B24/02C04B24/12C08F283/06C08F220/06C08F228/02C04B103/30
CPCC04B40/0046C04B24/165C04B22/06C04B24/16C04B22/128C04B22/00C04B24/02C04B24/127C08F283/065C04B2103/302C04B22/14C04B24/045C04B16/0683C08F220/06C08F228/02
Inventor 任建波苏鹏举刘禹杉张振生王守兴张伟利吕淑然边淑芳苏晓强陈凤琪郑立曼王建朋魏川王涛唐哲张业明
Owner 唐山冀东水泥外加剂有限责任公司
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