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A kind of cross-linked polycarboxylate slump retaining agent and preparation method thereof

A technology of polycarboxylic acid and slump-retaining agent, applied in the field of cross-linked polycarboxylic acid slump-retaining agent and its preparation, can solve the problems of difficult temperature control, narrow range, increase system steric hindrance, etc., and achieve a wide application range , temperature insensitive, the effect of a wide range of synthesis temperature

Active Publication Date: 2018-09-07
KZJ NEW MATERIALS GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The polyethylene glycol dimethacrylate used in this method can increase the steric hindrance of the system, but it is easier to hydrolyze than polypropylene glycol dimethyl polyoxyethylene ether when the ester bond is hydrolyzed, and the slump retention effect is worse. In addition, the synthesis temperature Higher and narrower range, it is difficult to control the temperature in industrial production
Up to now, there is no polycarboxylic acid slump-retaining agent with simple production process, good compatibility and good slump-retaining effect.

Method used

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  • A kind of cross-linked polycarboxylate slump retaining agent and preparation method thereof
  • A kind of cross-linked polycarboxylate slump retaining agent and preparation method thereof
  • A kind of cross-linked polycarboxylate slump retaining agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Get 85 parts of macromonomer isopentenol polyoxyethylene ether (TPEG) (molecular weight 2400) and 85 parts of water into the reaction container, stir until the macromonomer is completely dissolved, drop A, B, C, D four kinds of solutions, the dropping time of A, B, D solution is 3h, the dropping time of C solution is 3.5h, the reaction temperature is controlled at 10 ~ 50 ℃, keep warm for 1.5h after dropping, add NaOH solution to adjust the pH value to 4.5, replenishing water makes the solid content of the reaction solution drop to 40%, to obtain the cross-linked polycarboxylate slump retaining agent;

[0051] Among them, A solution is: take 4 parts of unsaturated acid acrylic acid (AA), 8.5 parts of unsaturated ester hydroxyethyl acrylate and 1.2 parts of polypropylene glycol dimethacrylate (m=6), and dissolve them in 10 parts of water to obtain A solution;

[0052] Solution B is: take 0.6 parts of oxidant hydrogen peroxide and dissolve it in 10 parts of water to obta...

Embodiment 2

[0058]Take 88 parts of macromonomer methallyl polyoxyethylene ether (HPEG) (molecular weight 3200) and 88 parts of water into the reaction container, stir until the macromonomer is completely dissolved, and drop A, B, C into it at the same time , D four kinds of solutions, the dropping time is 2h, the reaction temperature is controlled at 10 ~ 50 ℃, after the dropping is completed, keep warm for 2h, add NaOH solution to adjust the pH value to 6, replenish water to make the solid content of the reaction solution drop to 40%, The obtained cross-linked polycarboxylate slump retaining agent;

[0059] Among them, A solution is: take 4 parts of unsaturated acid acrylic acid, 2 parts of unsaturated ester hydroxyethyl methacrylate, 2 parts of hydroxymethyl acrylate and 2.1 parts of polypropylene glycol dimethacrylate (m=10), dissolve in 10 parts of water to obtain A solution;

[0060] Solution B is: take 0.8 parts of oxidant sodium persulfate and dissolve it in 10 parts of water to o...

Embodiment 3

[0066] Take 75 parts of macromonomer isopentenol polyoxyethylene ether (TPEG) (molecular weight 1600) and 75 parts of water into the reaction container, stir until the macromonomer is completely dissolved, and drop A, B1, B2, For C1, C2, and D solutions, the dropping time is 3 hours, the reaction temperature is controlled at 10-50 ° C, and the temperature is kept for 2 hours after the dropping is completed. Add NaOH solution to adjust the pH value to 5.5, and add water to reduce the solid content of the reaction solution to 40%. , to obtain the cross-linked polycarboxylate slump retaining agent;

[0067] Among them, A solution is: take 5 parts of unsaturated acid acrylic acid, 6 parts of unsaturated ester hydroxyethyl acrylate, 7.5 parts of methyl acrylate and 4.5 parts of polypropylene glycol dimethacrylate (m=15), dissolve in 10 parts of water , to obtain A solution;

[0068] B1 solution is: take 0.5 parts of oxidant sodium persulfate and dissolve in 5 parts of water to obt...

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Abstract

The invention discloses a crosslinking polycarboxylic slump retaining agent and a preparation method thereof. Structure of the crosslinking polycarboxylic slump retaining agent is shown as the following formula, and the agent is formed by copolymerization of a quaternary system macromonomer, unsaturated acid, unsaturated ester and poly-propylene glycol dimethyl acrylic ester. A one-step synthesis method is adopted, and synthesis temperature is controlled to be 10-50 DEG C, so that synthesis temperature range is wide, product performance is nonsensitive to temperature, ester groups of crosslinking monomer poly-propylene glycol dimethyl acrylic ester are released slowly, slump retaining effect is good, and influence on cement hydration is small.

Description

technical field [0001] The invention belongs to the field of building material admixtures, and in particular relates to a cross-linked polycarboxylic acid slump-retaining agent and a preparation method thereof. Background technique [0002] With the rapid development of my country's infrastructure construction, especially the large-scale construction of major projects such as high-speed railways in recent years, the quality requirements of commercial concrete during the construction process are becoming more and more stringent, and the rapid loss of concrete slump has caused serious damage to the construction site. some difficulties. Based on the various factors that affect the slump loss of concrete, scholars at home and abroad have designed slump-retaining agents with different molecular structures based on the idea of ​​molecular structure design for the problem of concrete slump loss after adding polycarboxylate superplasticizers. [0003] Patent CN 101830663 A discloses...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F220/06C08F220/28C08F222/20C08F220/14C08F220/18C08F2/38C08F4/40C04B24/26
Inventor 代柱端方云辉蒋卓君钟丽娜官梦芹
Owner KZJ NEW MATERIALS GROUP CO LTD
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