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A kind of low-temperature synthesis method of multi-branched polycarboxylate water reducing agent

A branched-chain polycarboxylic acid and a synthesis method technology are applied in the field of synthesis of a polycarboxylate water reducing agent for concrete, and can solve the problems of high mud content, poor durability, and reduced slump of freshly mixed concrete, and the like. The effect of simple preparation process and short reaction time

Inactive Publication Date: 2018-02-02
JIANGSU ZHONGKAI NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polycarboxylate superplasticizers are very sensitive to the mud content of sand and gravel in concrete, and the slump of freshly mixed concrete becomes smaller, and the slump loss is rapid, which seriously affects transportation, pumping and construction.
At the same time, high mud content has adverse effects on the strength and durability of concrete.
These problems have seriously affected the promotion and application of polycarboxylate superplasticizers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Under the ambient temperature of 20°C and stirring conditions, 360kg of isopentenol polyoxyethylene ether with a molecular weight of 2400 (Shanghai Taiji Chemical Co., Ltd., TJ-188) and 360kg of tap water were put into the reaction kettle. After the base material is completely dissolved, put in 3kg of ammonium persulfate, stir evenly and add the pre-configured A and B materials dropwise at the same time. Material A is a mixed solution made up of 25kg acrylic acid, 6kg acryloyloxyethyltrimethylammonium chloride and 60kg tap water, and material B is a mixed solution made up of 0.75kg vitamin C, 2kg thioglycolic acid and 88kg tap water. Add material A dropwise in 1 hour, and add material B dropwise in 1 hour. After adding material B dropwise, continue to react for 0.5 hours, then add water to dilute to a solid content of 40%, and then neutralize with 32wt% sodium hydroxide solution to a pH of 7 to obtain the product.

Embodiment 2

[0038] Under the ambient temperature of 10°C and stirring conditions, 350kg of isobutylene alcohol polyoxyethylene ether with a molecular weight of 2400 (Nanjing Yangzi Oak Chemical Co., Ltd., OXAC-608) and 350kg of deionized water were put into the reaction kettle. After the base material is completely dissolved, add 3.5kg of 30wt% hydrogen peroxide, stir evenly and add the pre-configured A and B materials dropwise at the same time. Material A is a mixed solution consisting of 38.5kg methacrylic acid, 11.5kg methacryloxyethyltrimethylammonium chloride and 40kg deionized water, and material B is 1.05kg vitamin C, 1.9kg thioglycolic acid and 108kg deionized water. A mixed solution composed of ionized water. Material A was added dropwise in 1 hour, and material B was added dropwise in 1.5 hours. After adding material B dropwise, continue to react for 1.5 hours, then add water to dilute to a solid content of 40%, and then neutralize with 32wt% sodium hydroxide solution to a pH o...

Embodiment 3

[0040] Under the ambient temperature of 15°C and stirring conditions, 350kg of prenol polyoxyethylene ether with a molecular weight of 2400 (Lotte Chemical (Jiaxing) Co., Ltd., VPEG) and 400kg of deionized water were put into the reaction kettle. After the base material is completely dissolved, put in 2.5kg of ammonium persulfate, stir evenly, and add the pre-configured A and B materials dropwise at the same time. Material A is a mixed solution consisting of 38.5kg of acrylic acid, 11.5kg of acryloyloxyethyltrimethylammonium chloride and 40kg of deionized water, and material B is 0.9kg of sodium bisulfite, 1.4kg of mercaptopropionic acid and 88kg of deionized water Mixed solution composed of water. Add material A dropwise in 1 hour, and add material B dropwise in 1 hour. After adding material B dropwise, continue to react for 1 hour, then add water to dilute to a solid content of 40%, and then neutralize with 32wt% sodium hydroxide solution to a pH of 8 to obtain the product....

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PUM

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Abstract

The invention discloses a low-temperature synthesis method of a multi-branched polycarboxylate superplasticizer. 1) Put a base material composed of unsaturated polyoxyethylene ether and water into a reaction kettle under a set temperature and stirring conditions; 2) After the base material is completely dissolved, put in the initiator, and add the pre-configured A and B materials dropwise at the same time; 3) The dropping time of A and B materials is controlled at 0.5‑1.5h, and the reaction is continued for 0.5 hours after the dropping ‑1.5h, dilute with water and neutralize with liquid caustic soda to pH 6‑8, and obtain that; wherein, the A material includes unsaturated carboxylic acid, unsaturated quaternary ammonium salt monomer and water; the B material includes a reducing agent , chain transfer agent and water. The synthesis method of polycarboxylate water-reducer provided by the present invention can synthesize multi-branched polycarboxylate water-reducer in one step within the range of 5-30°C, the selected initiator and reducing agent are low-temperature polymerization initiation system, and water As a solvent, the reaction process does not require external heat energy, the preparation process is simple, the reaction time is short, and it is environmentally friendly and economical.

Description

technical field [0001] The invention relates to a synthesis method of a polycarboxylate water reducer for concrete. Background technique [0002] Polycarboxylate superplasticizer is a kind of copolymer with comb structure, which is mainly prepared by free radical copolymerization of unsaturated polyoxyethylene ether, unsaturated carboxylic acid and other unsaturated small monomers. At present, in the synthesis process of polycarboxylate superplasticizer, steam heating is required, the reaction temperature is controlled at 60-70°C, the reaction time is 4-5 hours, and the production cycle is about 6 hours. If the polymerization process can be improved and the reaction is at low temperature and room temperature (5-30°C), the investment in boilers and cooling water circulation systems can be saved, while the process can be simplified, the production cycle can be shortened, production costs can be reduced, and economic benefits can be improved. [0003] When polycarboxylate supe...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C08F222/02C08F220/34C08F226/02C08F4/40C04B24/26C04B103/30
Inventor 张建淮冯金之夏磊林华锋付长红
Owner JIANGSU ZHONGKAI NEW MATERIALS
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