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Polyurethane modified polycarboxylate superplasticizer and preparation method thereof

A technology of polyurethane modified high-efficiency water reducer, which is applied in the field of polyurethane modified polycarboxylic acid high-efficiency water reducer and its preparation, which can solve the problems of self-polymerization, insufficient steric hindrance and electrostatic repulsion, high polymerization temperature, etc. question

Active Publication Date: 2017-03-08
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the comb-shaped polymer can be used to synthesize a polycarboxylate water reducer with a comb-shaped structure, due to its single material and high polymerization temperature, self-polymerization is very likely to occur, and the molecular structure of the synthesized polycarboxylic acid is too simple to be used. Fully provide effective steric hindrance and electrostatic repulsion, not beyond the scope of traditional comb structure

Method used

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  • Polyurethane modified polycarboxylate superplasticizer and preparation method thereof
  • Polyurethane modified polycarboxylate superplasticizer and preparation method thereof
  • Polyurethane modified polycarboxylate superplasticizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] The preparation method of the raw material polyurethane prepolymer used in embodiment 1 is: 22.2g isophorone diisocyanate is placed in the there-necked flask, and the polyethylene glycol 1000 ( 25 g of polyethylene glycol 1000 containing 0.2 g of dibutyltin dilaurate and dimethylolpropionic acid in N-methylpyrrolidone solution (3.35 g of dimethylolpropionic acid dissolved in 5 mL of N-methylpyrrolidone), and then adding 50g of water, heated to 70°C and kept warm, then added dropwise the mixed solution of hydroxyl-terminated polysiloxane and 1,4-butanediol (9g of hydroxyl-terminated polysiloxane mixed with 3g of 1,4-butanediol into), 2.5g ethylenediamine and 1.5g sodium dodecylbenzene sulfonate, stir after the addition is complete, and when the mass percentage of free -NCO in the mixed solution is detected to be 16%, stop heating to obtain polyurethane prepolymerized body.

Embodiment 2

[0058] The preparation method of the raw material polyurethane prepolymer used in Example 2 is: 10g of isophorone diisocyanate is placed in a three-necked flask, and polyethylene glycol 1000 (20g A solution of 1 g of dibutyltin dilaurate) and dimethylolpropionic acid in N-methylpyrrolidone in polyethylene glycol 1000 (2.7 g of dimethylolpropionic acid dissolved in 5 mL of N-methylpyrrolidone), and 50 g water, heated to 75°C and kept warm, and then added dropwise the mixed solution of hydroxyl-terminated polysiloxane / 1,4-butanediol (mixing 5.7g of hydroxyl-terminated polysiloxane and 4g of 1,4-butanediol into), 1g of ethylenediamine and 2g of sodium dodecylbenzenesulfonate, stirred after the addition, and when the mass percentage of free -NCO in the mixture was detected to be 16%, stop heating to obtain a polyurethane prepolymer.

Embodiment 3

[0060] The preparation method of the raw material polyurethane prepolymer used in Example 3 is: 30g of isophorone diisocyanate is placed in a three-necked flask, and polyethylene glycol 1000 (20g A solution of 2 g of dibutyltin dilaurate) and dimethylolpropionic acid in N-methylpyrrolidone in polyethylene glycol 1000 (6.7 g of dimethylolpropionic acid dissolved in 8 mL of N-methylpyrrolidone), and 60 g water, heated to 70°C and kept warm, and then added dropwise to the mixed solution of hydroxyl-terminated polysiloxane / 1,4-butanediol (3g of hydroxyl-terminated polysiloxane mixed with 1.5g of 1,4-butanediol into), 1.3g ethylenediamine and 2.5g sodium dodecylbenzene sulfonate, stir after the addition is complete, and when the mass percentage of free -NCO in the mixed solution is detected to be 16%, stop heating to obtain polyurethane prepolymerized body.

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Abstract

The invention relates to a polyurethane modified polycarboxylate superplasticizer and a preparation method thereof. The preparation method comprises the following steps: pouring a component A into polyurethane prepolymer at normal temperature, dropwise adding components B and C, and cooling to room temperature after dropwise addition is finished, adjusting the pH value to obtain the polycarboxylate superplasticizer, wherein the component A is prepared by mixing and stirring polyoxyethylene ether, polyethylene glycol and water and then adding a tin or acid catalyst and hydrogen peroxide; the component B is obtained by mixing acrylic acid, a reducing agent and water, and the component C is obtained by mixing sodium methallyl sulfonate, an initiator and water. The water reducer provided by the invention has the branch structure having a plurality of arms and long enough arm lengths, the steric hindrance effect can be brought into full play, the water reducing performance is excellent and the concrete working performance is improved; the method disclosed by the invention is mild in reaction condition, simple in process, less in side reactions, safe, environment-friendly, and low in energy-consuming and production cost.

Description

technical field [0001] The invention relates to a water reducer and a preparation method thereof, in particular to a polyurethane-modified polycarboxylic acid high-efficiency water reducer and a preparation method thereof. Background technique [0002] In the past one or two decades, concrete admixture technology has developed rapidly. The birth of polycarboxylate superplasticizer has made it possible to prepare concrete mixtures with low water-binder ratio and high fluidity. Polycarboxylate superplasticizer is composed of main chain and branch chain. It has the advantages of large degree of freedom in molecular structure, low dosage, high water reducing efficiency, wide cement adaptability, good slump retention, etc., and some functions are also It can be further strengthened by compounding. Therefore, the design and selection of a suitable polycarboxylate superplasticizer can not only effectively reduce the water demand of concrete and obtain the required workability, bu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/00C08F220/06C08F228/02C08G18/66C08G18/61C08G18/48C08G18/32C08G18/34C08G18/12C04B24/16C04B103/30
CPCC04B24/165C04B2103/302C08F283/006C08G18/12C08G18/4009C08G18/61C08G18/6692C08G18/6674C08F220/06
Inventor 史才军向顺成
Owner HUNAN UNIV
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