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A kind of early strength polyether ester water reducer and preparation method thereof

A technology of water reducing agent and polyether ester, which is applied in the field of concrete admixture and its preparation, and can solve the problems of poor concrete performance and insufficient early strength of concrete, etc.

Active Publication Date: 2018-02-16
广西新广建新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the deterioration of concrete performance caused by the reduction of the quality of existing sand sources and the problem of insufficient early strength of prefabricated concrete. The strength performance and slump retention value of the concrete with a mud content of about 1% are close to those of the corresponding concrete with a mud content of 1%. In addition, the early strength is increased by more than 70% compared with ordinary concrete

Method used

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  • A kind of early strength polyether ester water reducer and preparation method thereof
  • A kind of early strength polyether ester water reducer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1. Prepare base material

[0024] Add 145 kg of isobutenyl polyethylene glycol and 6 kg of acrylic acid to 120 kg of deionized water, stir and mix evenly to prepare a mixture, the mixture is warmed up to 20°C, and then 800 grams of 27.5% hydrogen peroxide and ammonium persulfate are added to the mixture 80 grams, stirred and mixed to prepare the bottom material.

[0025] 2. Preparation of A drip feed

[0026] A drop feed was prepared by adding 0.4 kg of vitamin C and 0.48 kg of mercaptopropionic acid (chain transfer agent) to 40 kg of deionized water.

[0027] 3. Preparation of modified polyethylene glycol methacrylate

[0028] Add 800 grams of polyethylene glycol monomethyl ether (molecular weight is 1200) into anhydrous drying kettle, stir and mix evenly, add 0.53 grams of phenothiazine, 232 grams of methacrylic acid and 21.3 grams of p-toluenesulfonic acid, seal and heat up to 120 ℃, esterification for 6.5 hours, during the 6.5 hours of esterification, the first v...

Embodiment 2

[0034] Other conditions are the same as in Example 1, except that polyethylene glycol acrylate is prepared in step 3, rather than modified polyethylene glycol acrylate, wherein the preparation steps of polyethylene glycol acrylate include:

[0035] Add 800 grams of polyethylene glycol monomethyl ether (molecular weight: 1200) into an anhydrous drying kettle, stir and mix evenly, add 0.45 grams of phenothiazine, 232 grams of methacrylic acid, seal and heat up to 100 ° C, esterify for 6.5 hours, During the 6.5-hour esterification process, vacuuming was performed for the first time at the 2nd hour, and then reacted for 1 hour and 45 minutes. The second time was vacuumed, and the reaction was continued for 1 hour. Add the vacuumized waste liquid to obtain polyethylene glycol methacrylate.

Embodiment 3

[0037] Other conditions were the same as in Example 1, except that in step 3, 194 grams of acrylic acid was used instead of 232 grams of methacrylic acid to obtain modified polyethylene glycol acrylate accordingly.

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Abstract

An early strength polyether ester water reducer is provided. The raw materials of the water reducer comprise: polyester with reactive unsaturated group, polyethylene glycol with reactive unsaturated group, acrylic acid, leucine, reducing agent, chain transfer agent and initiator. When the water reducer uses in the concrete with high clay content, the concrete can keep good performances of strength and slump retain value, and especially the concrete has good early strength performance.

Description

technical field [0001] The invention relates to an admixture for concrete and a preparation method thereof, in particular to an early-strength polyether ester water reducer and a preparation method thereof. Background technique [0002] Water reducers are also called dispersants or plasticizers, and they get their name because they can reduce the water consumption of freshly mixed concrete when used. In the field of modern concrete technology, water reducing agent is one of the admixtures to improve the rheological properties of concrete, and has been regarded as the fifth component of concrete besides cement, sand, stone and water. [0003] The common water reducers mainly include lignin cyclic salt type, naphthalene type, melamine type, sulfamate type polyether type and polycarboxylic acid type, etc., and now the most commonly used are polyether type and polyester type, but, In recent years, my country's infrastructure has developed rapidly, and energy and raw materials ar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/26C08F283/01C08F290/06C08F220/06C04B103/30
Inventor 马清沛
Owner 广西新广建新材料有限公司