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Ginkgolic acid grafted and modified polycarboxylate water-reducer and preparation method thereof

A graft modification, polycarboxylic acid technology, applied in the field of cement admixtures, can solve problems such as water quality and environmental pollution, and achieve the effect of reducing pollution

Active Publication Date: 2017-10-13
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the ginkgo biloba has a special odor after being discarded, it will cause water quality and environmental pollution.

Method used

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  • Ginkgolic acid grafted and modified polycarboxylate water-reducer and preparation method thereof
  • Ginkgolic acid grafted and modified polycarboxylate water-reducer and preparation method thereof
  • Ginkgolic acid grafted and modified polycarboxylate water-reducer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] In the glass reaction equipment equipped with thermometer, stirrer, constant pressure dropping funnel, nitrogen conduit and reflux condenser, add the water of the isobutylene polyoxyethylene ether of 95 mass parts, the ginkgolic acid of 1 mass part and 60 mass parts, While stirring, purging the interior of the reaction device with nitrogen, when the temperature rose to 20 degrees, uniformly added dropwise a solution of 4 parts by mass of acrylic acid and 50 parts by mass of water to the reaction device for 2 hours, while A solution of 0.1 parts by mass of ammonium persulfate, 0.05 parts by mass of mercaptopropionic acid and 60 parts by mass of water was added dropwise at a constant speed to the reaction device, and the dropping time was 3.5 hours.

[0031] After the aqueous solution of ammonium persulfate and mercaptopropionic acid has been added dropwise, keep it warm at 20°C for 1 hour, add a sodium hydroxide solution with a mass fraction of 32%, and neutralize the sys...

Embodiment 2

[0038] In the glass reaction equipment equipped with thermometer, stirrer, constant pressure dropping funnel, nitrogen conduit and reflux condenser, add the water of the isobutylene polyoxyethylene ether of 65 mass parts, the ginkgolic acid of 15 mass parts and 60 mass parts, While stirring, purging the interior of the reaction equipment with nitrogen, when the temperature rose to 80 degrees, uniformly added dropwise a solution of 20 parts by mass of acrylic acid and 50 parts by mass of water to the reaction device, and the dropping time was 2.5 hours. At the same time, a solution of 10 parts by mass of ammonium persulfate, 5 parts by mass of thioglycolic acid and 60 parts by mass of water was added dropwise at a constant speed to the reaction device, and the dropping time was 3 hours.

[0039] After the ammonium persulfate aqueous solution was added dropwise, keep it warm at 80°C for 1 hour, add 32% sodium hydroxide solution, neutralize the system until the pH value is 6-7, an...

Embodiment 3

[0044] In glass reaction equipment equipped with thermometer, stirrer, constant pressure dropping funnel, nitrogen conduit and reflux condenser, add 85 mass parts of isopentenyl polyoxyethylene ether, 5 mass parts of ginkgolic acid and 60 mass parts of Water, while stirring, purging the interior of the reaction equipment with nitrogen, when the temperature rises to 60 degrees, uniformly add a solution of 10 parts by mass of acrylic acid and 50 parts by mass of water to the reaction device dropwise, and the dropping time is 2.5 hours , At the same time, a solution of 0.5 mass parts of ammonium persulfate, 1 mass part of mercaptopropionic acid and 60 mass parts of water was added dropwise at a constant speed in the reaction equipment, and the dropping time was 3.5 hours.

[0045] After the ammonium persulfate aqueous solution was added dropwise, keep it warm at 60°C for 1 hour, add 32% sodium hydroxide solution to neutralize the system until the pH value is 6-7, and the obtained ...

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Abstract

The invention provides a ginkgolic acid grafted and modified polycarboxylate water-reducer and a preparation method thereof. The polycarboxylate water-reducer is a random copolymer prepared by polymerizing ginkgolic acid, unsaturated polyether, unsaturated carboxylic acid or salt thereof. The preparation method comprises the following steps: dissolving ginkgolic acid and unsaturated polyether into water; heating the solution to reach the temperature of 20-80 DEG C; then correspondingly dropwise adding the aqueous solution of unsaturated carboxylic acid and the aqueous solution of an initiator and a chain transfer agent for 2-2.5 hours and 3-3.5 hours; continuously reacting for 1 hour under the temperature of 20-80 DEG C after dropwise adding; cooling; neutralizing the system with liquid caustic soda until the pH is 6-7, so as to obtain the ginkgolic acid grafted and modified polycarboxylate superplasticizer. According to the preparation method, unsaturated ginkgolic acid is extracted from waste ginkgo biloba exocarp; carboxyl, hydroxyl and side chain of ginkgolic acid are introduced into a water-reducer molecular structure, therefore, the wastes are treated into treasure on the premise that the performance of the water-reducer is maintained, and as a result, the environment is protected, and the cost of the polycarboxylate water-reducer is decreased.

Description

technical field [0001] The invention relates to the technical field of cement admixtures, in particular to a polycarboxylate water reducer modified by gingkgolic acid grafting and a preparation method thereof. Background technique [0002] my country's ginkgo fruit resources are very rich. In addition to satisfying domestic sales, they are also exported to overseas in large quantities. Ginkgo fruit is composed of the ginkgo inside and the seed coat wrapped around the ginkgo, and the fruit growers only collect the ginkgo during the collection process, and the outer testa is discarded because it contains a large amount of toxic substance ginkgolic acid. Therefore, when gathering ginkgo fruit, a large amount of ginkgo exocarp wastes will be produced thereupon. According to ginkgo annual output estimation, there are more than 100,000 tons of fresh ginkgo testa waste in major production areas every year, and about 60% of the moisture is removed, and there are about 40,000 to 60,...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C08F212/14C04B24/26C04B103/30
CPCC04B24/2694C04B2103/302C08F283/065C08F220/06C08F212/14
Inventor 雷家珩陈刚陈常亮杜小弟张思泉
Owner WUHAN UNIV OF TECH
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