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Method for low-temperature synthesis of polycarboxylate water reducer by using isoamyl alcohol polyether

A technology of prenol polyether and polycarboxylic acid, which is applied in the field of prenol polyether low-temperature synthesis of polycarboxylate water reducers, can solve the problems of solvent recovery, high cost, and high toxicity, and achieve simple process , cost reduction, and simple operation

Inactive Publication Date: 2015-01-07
ZHEJIANG LYUKEAN CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the problems of high cost, high toxicity and need for solvent recovery in the low-temperature synthesis of conventional polycarboxylate superplasticizers, the present invention provides a stable and efficient prenol with high water-reducing rate without adding solvents Method for synthesizing polycarboxylate water reducer with polyether at low temperature

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] In a stirring four-neck flask, put 300 parts of prenol polyether and 300 parts of water into it, raise the temperature to 10°C, until it completely melts to form a prenol polyether solution, add 5 parts of H 2 o 2 (50%) and 82 parts of H2O 2 o 2 Aqueous solution, after stirring for 10 minutes, add dropwise the acrylic acid aqueous solution of 27 parts of acrylic acid and 30 parts of water and the mixed solution of 0.1 part of L-ascorbic acid, 6 parts of thioglycolic acid and 71 parts of water, respectively. For 2.5 hours and 3 hours, after the dropwise addition, keep warm for 3 hours to carry out the copolymerization reaction. After the reaction is completed, add 28 parts of 30% sodium hydroxide aqueous solution, adjust the system pH=6.2, stir for 10min, and discharge to obtain polycarboxylic acid reduced Aqua, wherein, 5 parts H 2 o 2 (50%) and 82 parts of H2O 2 o 2 The aqueous solution is used as a reducing agent, and the added 0.1 part of L-ascorbic acid consti...

Embodiment 2

[0024] In a stirring four-neck flask, put 300 parts of prenol polyether and 200 parts of water, raise the temperature to 25 ° C, until it completely melts to form a prenol polyether solution, add 8 parts of H 2 o 2 (50%) and 82 parts of H2O 2 o 2 Aqueous solution, after stirring for 10 minutes, add dropwise the acrylic acid aqueous solution of 40 parts of acrylic acid and 5 parts of water, the mixed solution of 1 part of L-ascorbic acid, 0.2 parts of mercaptopropionic acid and 194 parts of water, the time of adding the aqueous acrylic acid solution and the mixed solution 5 hours and 5.5 hours respectively. After the dropwise addition, keep warm for 2 hours to carry out the copolymerization reaction. After the reaction is completed, add 42 parts of 30% sodium hydroxide aqueous solution to adjust the pH of the system to 7.2, stir for 10 minutes, and discharge to obtain polycarboxylic acid Water reducing agent.

Embodiment 3

[0026] In a stirring four-neck flask, put 300 parts of prenol polyether and 1200 parts of water, raise the temperature to 25 ° C, until it completely melts to form a prenol polyether solution, add 8 parts of H 2 o 2 (50%) and 82 parts of H2O 2 o 2 Aqueous solution, after stirring for 10 minutes, add dropwise the acrylic acid aqueous solution of 54 parts of acrylic acid and 18 parts of water, the mixed solution of 1 part of L-ascorbic acid, 0.2 parts of mercaptopropionic acid and 144 parts of water, and the adding time of the acrylic acid aqueous solution and the mixed solution 6 hours and 7 hours respectively. After the dropwise addition, keep warm for 1 hour to carry out the copolymerization reaction. After the reaction is completed, add 56 parts of 30% sodium hydroxide aqueous solution to adjust the pH of the system to 6.8, stir for 10 minutes, and discharge to obtain polycarboxylic acid Water reducing agent.

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Abstract

The invention relates to a method for low-temperature synthesis of a polycarboxylate water reducer by using isoamyl alcohol polyether, belonging to the technical field of water reducer preparation. The method comprises the following steps: by adopting isoamyl alcohol polyether and acrylic acid as raw materials, firstly forming an isoamyl alcohol polyether solution by dissolving isoamyl alcohol polyether into deionized water under heating conditions, respectively dropwise adding an acrylic acid aqueous solution and a mixed solution of a mercaptan type water-soluble chain transfer agent and a free radical type initiating agent into the isoamyl alcohol polyether solution, adjusting the temperature of a system, then performing copolymerization, and adding an alkaline regulator to obtain a finished polycarboxylate water reducer. A technical scheme disclosed by the invention has the advantages of high monomer utilization rate, more effective components of the water reducer, low cost and the like.

Description

technical field [0001] The invention relates to a method for synthesizing a polycarboxylate water-reducer at low temperature with isopentenol polyether, and belongs to the technical field of water-reducer preparation. Background technique [0002] Concrete water reducing agent (also known as superplasticizer, Superlasticizer) refers to an admixture that can reduce the amount of mixing water and improve the strength of concrete under the condition of concrete workability and cement dosage unchanged; , complexation, electrostatic repulsion, etc. to hinder or destroy the flocculation structure of cement particles, so as to save the amount of cement while ensuring the workability and strength of concrete. The mechanism of action of concrete superplasticizer works through dispersion, lubrication, steric hindrance and slow release of grafted polybranches. [0003] Polycarboxylate superplasticizer is the third-generation high-performance superplasticizer developed after the common...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C04B24/26C04B103/30
Inventor 董楠金一丰万庆梅向松柏唐福伟
Owner ZHEJIANG LYUKEAN CHEM
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