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Polycarboxylic-acid copolymer dispersant and preparation method thereof

A technology of copolymer and polycarboxylic acid, applied in the field of superplasticizer, new polycarboxylate high-performance water reducer and its preparation, can solve problems such as poor slump retention performance, and achieve good concrete slump and The effect of fluidity, high concrete water reduction rate

Active Publication Date: 2011-04-27
SHANGHAI SUNRISE POLYMER MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invented polycarboxylate cement dispersant has a high water reducing rate and can also improve the early strength of concrete, but the inventive polycarboxylate cement dispersant has poor slump retention performance

Method used

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  • Polycarboxylic-acid copolymer dispersant and preparation method thereof
  • Polycarboxylic-acid copolymer dispersant and preparation method thereof
  • Polycarboxylic-acid copolymer dispersant and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Synthetic example 1

[0052] Put 132.0g of 3-allyloxy-1,2-propanediol and 2.0g of catalyst sodium methoxide into a 2L reactor, replace the reactor with nitrogen, stir and raise the temperature to 105°C~115°C, vacuumize to remove water and Methanol, the vacuum pressure is above negative 0.09MPa, and the vacuum time is 30 minutes. After stopping vacuuming, add a small amount of ethylene oxide from the top of the reactor until the pressure of the reactor rises to about 0.10MPa; The speed is to keep the pressure in the reactor between 0.30MPa and 0.40MPa, and the reaction temperature is maintained at 105°C to 115°C by adjusting the cooling water, and the cumulative weight of ethylene oxide added is 1760g. After all the ethylene oxide is added, continue the heat preservation reaction at 105°C to 115°C for more than 30 minutes until the pressure in the reactor no longer drops, then cool down to 50°C to 60°C and discharge to obtain unsaturated polyether monomer, record for A-1.

Synthetic example 2

[0054] Put 73.0g of 3-(2-methallyloxy)-1,2-propanediol and 1.0g of catalyst sodium methoxide into a 2L reactor, replace the reactor with nitrogen, and stir to raise the temperature to 130℃~140℃ , vacuumize to remove water and methanol, the vacuum pressure reaches minus 0.09MPa, and the vacuum time is 30 minutes. After stopping vacuuming, add a small amount of ethylene oxide from the top of the reactor until the pressure of the reactor rises to about 0.10MPa; The speed is to keep the pressure in the reactor between 0.30MPa and 0.40MPa, and the reaction temperature is maintained at 130°C to 140°C by adjusting the cooling water, and the cumulative weight of ethylene oxide added is 1760g. After all the ethylene oxide is added, continue the heat preservation reaction at 130°C to 140°C for more than 30 minutes until the pressure in the reactor no longer drops, then cool down to 50°C to 60°C and discharge to obtain unsaturated polyether monomer, record for A-2.

Synthetic example 3

[0056] Put 73.0g of 3-(2-methallyloxy)-1,2-propanediol and 2.0g of catalyst sodium amide into a 2L reactor, replace the reactor with nitrogen, and stir to raise the temperature to 140℃~150℃ , Vacuum out water and ammonia, the vacuum pressure reaches minus 0.09MPa or more, and the vacuum time is 30 minutes. After stopping vacuuming, add a small amount of mixture of ethylene oxide and propylene oxide from the top of the reactor (the molar ratio of ethylene oxide and propylene oxide is 95:5), until the pressure of the reactor rises to about 0.10MPa; After the pressure of the kettle falls back, continue to feed the mixture of ethylene oxide and propylene oxide at a slow speed (the mass ratio of ethylene oxide and propylene oxide is 95:5), and the speed of feeding the epoxy mixture is to keep the reaction The pressure in the kettle is between 0.30MPa and 0.40MPa, and the reaction temperature is maintained at 140°C to 150°C by adjusting the cooling water, and the cumulative weight o...

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Abstract

The invention discloses a polycarboxylic-acid copolymer dispersant and a preparation method thereof, wherein the dispersant is a polycarboxylic-acid copolymer which contains a structural unit (1), a structural unit (2) and a structural unit (3) and has the weight average molecular weight of 5000-120000, wherein the structural unit (1) is derived from an unsaturated polyether monomer, the structural unit (2) is derived from an unsaturated polyether monomer, and the structural unit (3) with the concentration of 5.0-30.0 percent by weight is derived from an unsaturated carboxylic-acid monomer; and the preparation method of the polycarboxylic-acid copolymer dispersant comprises the step of copolymerizing the unsaturated polyether monomer (A), the unsaturated polyether monomer (B) and the unsaturated carboxylic-acid monomer (C) at the temperature of 20-110 DEG C and in the presence of a chain transfer agent and an initiator to obtain the polycarboxylic-acid copolymer dispersant. Concrete still has high water-reducing rate under the condition of lower blending quantity of the copolymer dispersant of the invention, and meanwhile, the concrete still has better slump and fluidity after thecopolymer dispersant of the invention is blended.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, and relates to a superplasticizer for mortar or concrete, in particular to a novel polycarboxylate high-performance water reducer and a preparation method thereof. Background technique [0002] Polycarboxylate high-performance water reducer is called the third-generation concrete superplasticizer, which has the advantages of low dosage, high water reducing rate, large degree of freedom in molecular structure design, and environmental friendliness. It has become a concrete admixture in the 21st century Research hotspots and development priorities in the field. [0003] In the patent CN1412175, a method for preparing an allyl ether ester monomer and a method for preparing a water reducer with the monomer are disclosed: firstly, the allyl alcohol polyether is treated with an adsorbent material such as alumina and its peroxide value reaches 5.0meq / kg or less, then carry out esterificatio...

Claims

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Application Information

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IPC IPC(8): C04B24/32C02F103/40
CPCC04B24/2647C04B24/2694C04B24/32
Inventor 冯中军郑柏存傅乐峰
Owner SHANGHAI SUNRISE POLYMER MATERIAL CO LTD
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