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Preparation method of polycarboxylate superplasticizer

A technology of high-efficiency water reducing agent and polycarboxylic acid, which is applied in the field of water reducing agent for concrete, can solve problems such as agglomeration and loss of water reducing performance, achieve the effects of inhibiting polymerization, improving water reducing performance, and increasing steric hindrance

Inactive Publication Date: 2018-01-26
CHANGZHOU SIYU ENVIRONMENTAL PROTECTION MATERIAL SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention: In view of the current traditional powder spraying process, the water reducing agent is affected by high temperature during the powder spraying process, and continues to polymerize into a substance with a larger molecular weight, resulting in loss of water reducing performance and even agglomeration

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0022] A preparation method of polycarboxylic acid high-efficiency water reducer, the preparation method comprising the steps of:

[0023] (1) According to the mass ratio of 4~7:2~3:0.3~0.7:10, put methoxypolyethylene glycol, itaconic anhydride, catalyst and water into the reactor, and use nitrogen protection, at 60~ Preheat at 65°C for 50-70 minutes, raise the temperature to 95-105°C, and react for 2-3 hours;

[0024] (2) After the reaction is over, lower the temperature to 56-65°C, add 3-[bis(2-hydroxyethyl)amino]propanetriethoxysilane, polymerization inhibitor, 3-[bis(2-hydroxyethyl) Base) amino] propane triethoxysilane, the mass ratio of polymerization inhibitor is 7:0.9 ~ 1.1, the addition amount of 3-[bis (2-hydroxyethyl) amino] propane triethoxy silane is methoxy 20-25% of the mass of polyethylene glycol, stirred at 200r / min for 20-30min, cooled to room temperature, discharged, collected the reaction mixture, and distilled the discharged material to remove water and co...

example 1

[0028] A preparation method of polycarboxylic acid high-efficiency water reducer, the preparation method comprising the steps of:

[0029] (1) According to the mass ratio of 4:2:0.3:10, put methoxypolyethylene glycol, itaconic anhydride, catalyst and water into the reactor, use nitrogen protection, preheat at 60°C for 50min, and raise the temperature to 95°C, react for 2h;

[0030] (2) After the reaction is over, lower the temperature to 56°C, add 3-[bis(2-hydroxyethyl)amino]propanetriethoxysilane, polymerization inhibitor, 3-[bis(2-hydroxyethyl) The mass ratio of amino] propane triethoxysilane and polymerization inhibitor is 7:0.9, and the addition amount of 3-[two (2-hydroxyethyl) amino] propane triethoxysilane is methoxypolyethylene glycol 20% of the mass, stirred at 200r / min for 20min, cooled to room temperature, discharged, collected the reaction mixture, and distilled the discharged material to remove water and collect the distillation residue;

[0031] (3) In parts by...

example 2

[0034] A preparation method of polycarboxylic acid high-efficiency water reducer, the preparation method comprising the steps of:

[0035] (1) According to the mass ratio of 5:2.5:0.5:10, put methoxypolyethylene glycol, itaconic anhydride, catalyst and water into the reactor, use nitrogen protection, preheat at 62°C for 60min, and raise the temperature To 100°C, react for 2.5h;

[0036] (2) After the reaction, cool down to 60°C, add 3-[bis(2-hydroxyethyl)amino]propanetriethoxysilane, polymerization inhibitor, 3-[bis(2-hydroxyethyl) Amino] propane triethoxysilane, the mass ratio of inhibitor is 7:1, the addition amount of 3-[two (2-hydroxyethyl) amino] propane triethoxysilane is methoxypolyethylene glycol 23% of the mass, stirred at 200r / min for 25min, cooled to room temperature, discharged, collected the reaction mixture, and distilled the discharged material to remove water and collect the distillation residue;

[0037] (3) In parts by weight, take 110 parts of water, 63 pa...

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Abstract

Belonging to the technical field of water reducing agents for concrete, the invention in particular relates to a preparation method of a polycarboxylate superplasticizer. According to the invention, methoxy polyethylene glycol and itaconic anhydride are adopted as the raw materials for polymerization under the action of a catalyst to form a macromonomer, then 3-[bis(2-hydroxyethyl)amino]propane triethoxysilane is utilized for modification on the macromonomer, so that amino and siloxy are added to the branched chain, on the one hand, the combination degree with water is increased through amino,and on the other hand the silicon oxygen bond is utilized to increase the combination with concrete, thus lowering water consumption, because of the increase of bond, the steric hindrance is increased, polymerization among the water reducing agent is effectively inhibited, at the same time, polymerization with acrylic acid and the like is carried out so as to form the superplasticizer, while theperformance of the superplasticizer is improved, polymerization among the superplasticizer is prevented.

Description

technical field [0001] The invention belongs to the technical field of water reducers for concrete, and in particular relates to a preparation method of polycarboxylic acid high-efficiency water reducers. Background technique [0002] Polycarboxylate superplasticizer is a kind of superplasticizer with better comprehensive performance. Its high water reducing rate and good slump retention are beyond the reach of previous Cai series or aliphatic superplasticizers. The group. At present, polycarboxylate superplasticizers are mostly liquid products with 10%~50% (mass fraction, the same below). Due to their superior performance, they are more and more used in various key projects. However, sometimes the construction site is far away, resulting in continuous increase in transportation costs, so the development of high-concentration or solid polycarboxylate products is the primary condition for reducing transportation costs and promoting the widespread use of polycarboxylate water ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F290/06C08F220/06C08F220/14C08G65/336C04B24/26C04B103/30
Inventor 王磊卢丽丽
Owner CHANGZHOU SIYU ENVIRONMENTAL PROTECTION MATERIAL SCI & TECH