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Multi-functional high-performance reduction material of polycarboxylic acid series and preparation method thereof

A multi-functional, high-performance technology, applied in the field of building materials, can solve problems such as poor operability, complex synthesis process, and difficult control

Inactive Publication Date: 2016-02-17
LIMING VOCATIONAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Chinese patents CN200510037872, CN201010102093.0 and CN200610040089 have synthesized polycarboxylate water-reducers with high water-reducing rate and good shrinkage-reducing function. The synthesis process is too complicated after esterification and then polymerization. Not very maneuverable, hard to control

Method used

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  • Multi-functional high-performance reduction material of polycarboxylic acid series and preparation method thereof
  • Multi-functional high-performance reduction material of polycarboxylic acid series and preparation method thereof
  • Multi-functional high-performance reduction material of polycarboxylic acid series and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add 2-acrylamido-2-methylpropanesulfonic acid solution into a four-necked glass flask, pass nitrogen to deoxygenate, raise the temperature to 55°C~85°C, and fully stir to dissolve, slowly add polyethylene dropwise within 2~4h Glycol monomethyl ether acrylate, acrylic acid, diethylene glycol monobutyl ether maleic anhydride monoester mixed solution and initiator solution, keep the temperature at 55℃~85℃ for 1~2h after dropping, add the catalyst at 55℃~100 After reacting at ℃ for 1-2 hours, carry out vacuum filtration for 2 hours, cool to room temperature after the reaction, and then use NaOH solution with mass fraction w(NaOH)=30% to adjust pH=7 and discharge the material, a multifunctional high-performance polymer can be obtained. Carboxylic acid shrinkage reducing material.

[0024] The catalyst is a composite catalyst of p-toluenesulfonic acid and concentrated hydrochloric acid, the amount of which is 6% of the total mass of the reaction monomers, and the mass ratio o...

Embodiment 2

[0033] It is basically the same as Example 1, the difference is:

[0034] in the water-reducing group Among them, n=35, x is 3, y is 5, z is 10, and k is 2.

[0035] The catalyst is a composite catalyst of p-toluenesulfonic acid and concentrated hydrochloric acid, the amount of which is 9% of the total mass of the reaction monomers, and the mass ratio of p-toluenesulfonic acid and concentrated hydrochloric acid is 1.4:1.

[0036] The molar ratio of polyethylene glycol monomethyl ether acrylate, acrylic acid, 2-acrylamido-2-methylpropanesulfonic acid and diethylene glycol monobutyl ether maleic anhydride monoester is 0.35:1:0.30:1.

[0037] The initiator is potassium persulfate-ascorbic acid composite initiator, its consumption is 4% of the total mass of the reaction monomer, and the mass ratio of potassium persulfate to ascorbic acid is 1:2.

Embodiment 3

[0039] Basically the same as Example 1, the difference is:

[0040] in the water-reducing group Among them, n=10, x is 5, y is 25, z is 10, and k is 8.

[0041] The catalyst is a p-toluenesulfonic acid catalyst, and its consumption is 9% of the total mass of the reaction monomers.

[0042] The molar ratio of polyethylene glycol monomethyl ether acrylate, acrylic acid, 2-acrylamido-2-methylpropanesulfonic acid and diethylene glycol monobutyl ether maleic anhydride monoester is 0.50:2.5:0.75:1.

[0043] The initiator is a potassium persulfate initiator, and its consumption is 10% of the total mass of the reaction monomers.

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Abstract

The invention provides a multi-functional high-performance reduction material of polycarboxylic acid series and a preparation method thereof. The preparation method comprises the steps of raising the temperature of a 2-acrylamido-2-methyl propane sulfonic acid solution to 55-85 DEG C under a nitrogen protection environment, conducting sufficient stirring, dissolving the solution uniformly, dropwise adding a mixed solution of polyethylene glycol monomethyl ether methyl acrylate, acrylic acid, diethylene glycol monobutyl ether maleic anhydride monoester and an initiator solution to the 2-acrylamido-2-methyl propane sulfonic acid solution within 2-4 hours, and obtaining a first-order reaction solution after dropwise adding is completed; leaving the first-order reaction solution being subjected to treatment at the constant temperature of 55-85 DEG C for 1-2 hours, then adding a catalyst, conducting a reaction for 1-2 hours at the temperature of 55-100 DEG C, conducting vacuum filtration for two hours, after the reaction is ended, cooling the mixture to the room temperature, then using an alkali solution for adjusting the pH value to be 7, discharging the material, and obtaining the multi-functional high-performance reduction material of the polycarboxylic acid series. According to the multi-functional high-performance reduction material of the polycarboxylic acid series and the preparation method thereof, the main synthesis raw materials are abundant in source, the synthesis process is simple, and good construction performance, mechanical properties and volume stability are achieved.

Description

technical field [0001] The invention belongs to the field of building materials, in particular to a multifunctional high-performance polycarboxylate shrinkage-reducing material and a preparation method thereof. Background technique [0002] In recent years, many experts and scholars at home and abroad have conducted a lot of research and discussion on polycarboxylic acid chemical admixtures, and there are many related reports. There are also many manufacturers that can produce products with relatively stable quality and are widely used in concrete. in the field. The biggest advantages of polycarboxylate chemical admixtures are high water-reducing rate and good slump retention performance. It is considered as the third generation of concrete chemical admixtures in Germany. At present, especially in the promotion and application of high-performance concrete, the shrinkage of concrete and the resulting cracking phenomenon are becoming more and more serious. By adding ordinary ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F222/16C08F220/58C04B24/26C04B103/30
Inventor 陈宝璠卓玲
Owner LIMING VOCATIONAL UNIV
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