Waterborne epoxy ester-modified polycarboxylate superplasticizer as well as preparation method and application thereof

A technology of epoxy ester and polycarboxylic acid, which is applied in the field of building materials, can solve the problems of unfavorable large-scale promotion and high price, and achieve the effects of good strength, simple production equipment, and good shrinkage

Active Publication Date: 2021-07-27
SHANXI SUNWAY INTION TRADE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Water reducers reduce concrete shrinkage by reducing the surface tension of the pore solution. The effect is better, but the price is expensive, which is not conducive to large-scale promotion

Method used

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  • Waterborne epoxy ester-modified polycarboxylate superplasticizer as well as preparation method and application thereof
  • Waterborne epoxy ester-modified polycarboxylate superplasticizer as well as preparation method and application thereof
  • Waterborne epoxy ester-modified polycarboxylate superplasticizer as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Preparation of waterborne epoxy esters:

[0054] Add linolenic acid into a four-necked flask equipped with mechanical stirring, water separator (including condenser), thermometer and nitrogen inlet device, start stirring and pass in nitrogen protection, heat up to 150°C within 1h, and then add epoxy Resin E-12, the weight ratio of linolenic acid to epoxy resin E-12 is 0.6:1. After the epoxy resin E-12 is melted, add the catalyst monobutyltin oxide, then raise the temperature to 200°C within 1.5 hours, keep warm for esterification, and take samples every 0.5 hours to measure the acid value and viscosity. When the acid value drops below 3mgKOH / g, stop heating, immediately cool down, and when the temperature drops to 60°C, add n-butanol and ethylene glycol butyl ether (system solid content is 60%) to obtain water-based epoxy ester.

[0055] Preparation of water-based epoxy ester modified polycarboxylate water reducer:

[0056] Step A, in the 1L four-neck flask with a cap...

Embodiment 2

[0062] According to the preparation method of Example 1, the difference is: when preparing the bottom liquid in step A, add 100g of water-based epoxy ester to obtain the polycarboxylate water-reducer HY-2 modified by water-based epoxy ester, and carry out The performance test results are shown in Table 1.

Embodiment 3

[0064] According to the preparation method of Example 1, the difference is: when preparing the bottom liquid in step A, add 300g water-based epoxy ester to obtain the polycarboxylate water-reducer HY-3 modified by water-based epoxy ester, and carry out The performance test results are shown in Table 1.

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Abstract

The invention discloses a water-based epoxy ester-modified polycarboxylate superplasticizer as well as a preparation method and application thereof. The polycarboxylate superplasticizer is prepared from the following raw materials: waterborne epoxy ester, polyoxyethylene ether, acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid, an initiator, a molecular weight regulator, a pH regulator and deionized water. According to the invention, the water-based epoxy ester is creatively added into the polycarboxylate superplasticizer, and through interaction of the raw materials in the polycarboxylate superplasticizer and further control of the specific proportions of the raw materials, the polycarboxylate superplasticizer has a certain water reducing rate and is ensured to have good strength in a later period; surface tension is reduced, and the polycarboxylate superplasticizer has good shrinkage reducing performance, so after shrinkage of concrete is reduced; process steps are simple and easy to operate; reaction conditions are relatively mild; used production equipment is relatively simple; pollution is not generated in a preparation process; production efficiency is relatively high; and reduction of production cost is facilitated.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a water-based epoxy ester modified polycarboxylate water reducer and its preparation method and application. Background technique [0002] Water reducer is a concrete admixture that can reduce the amount of mixing water while maintaining the slump of concrete basically unchanged. Most of them are anionic surfactants, such as lignosulfonate, naphthalenesulfonate formaldehyde polymer, etc. After being added to the concrete mixture, it can disperse the cement particles, improve its working performance, reduce the unit water consumption, improve the fluidity of the concrete mixture, or reduce the unit cement consumption. [0003] Among them, polycarboxylate superplasticizer has good comprehensive technical performance advantages, and the preparation process is green and environmentally friendly, and its performance can be controlled through molecular design. Polycarboxyl...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F290/06C08F220/06C08F220/58C04B24/16C04B103/30
CPCC08F283/065C08F290/064C04B24/165C04B24/163C04B2103/302C08F220/06C08F220/585
Inventor 马雪英吕勇
Owner SHANXI SUNWAY INTION TRADE CO LTD
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