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Polycarboxylic acid polymer dispersant and preparation method thereof

A technology of polymer and dispersant, applied in the field of new polycarboxylate high-performance water reducer and its preparation, which can solve problems such as poor slump retention performance

Active Publication Date: 2012-08-15
SHANGHAI SUNRISE POLYMER MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 polymer dispersant and preparation method thereof
  • Polycarboxylic acid polymer dispersant and preparation method thereof
  • Polycarboxylic acid polymer dispersant and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Synthetic example 1

[0050] 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

[0052] 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

[0054] 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 polymer dispersant and a preparation method thereof. The polycarboxylic acid polymer dispersant contains a structural unit (1) from unsaturated polyether monomer, a structural unit (2) from unsaturated polyether monomer, and 3.0-20.0 wt% of a structural unit (3) from unsaturated carboxylic acid monomer; and the weight average molecular weight of the polycarboxylic acid polymer is 10000-120000. The preparation method comprises the following steps: in the presence of an initiator, polymerizing unsaturated polyether monomer (A), unsaturated polyethermonomer (B) and unsaturated carboxylic acid monomer (C) at 20-110 DEG C to obtain the polycarboxylic acid polymer dispersant. The polycarboxylic acid polymer dispersant still has high water reducing rate for concrete under the condition of low doping amount; and meanwhile, the concrete doped with the polycarboxylic acid polymer dispersant still has favorable slump constant and fluidity.

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 esterific...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/26C08F283/06C04B103/30
CPCC04B24/2647C04B24/165
Inventor 冯中军郑柏存傅乐峰
Owner SHANGHAI SUNRISE POLYMER MATERIAL CO LTD
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