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Damping polycarboxylic acid water reducing agent as well as preparation method and special production equipment thereof

A technology of water reducing agent and polycarboxylic acid, which is applied in the field of concrete admixtures, can solve the problems of inability to obtain molecular weight polycarboxylic acid products, weak polyether polymerization activity, poor mud blocking effect, etc., and achieves good mud blocking effect and molecular weight. The effect of narrow distribution and high double bond retention

Active Publication Date: 2018-03-20
武汉新绿博恩科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the unsaturated polyether used in the present invention is a copolymer whose side chain is polyoxyethylene or polyoxyethylene and polyoxypropylene, and the side chain still has strong hydrophilicity, and the polymerization activity of the synthesized polyether is not strong.
At the same time, 2-acrylamide-2 methylpropanesulfonic acid in the raw material is expensive and has a chain transfer effect, and the polycarboxylic acid product with higher molecular weight cannot be obtained, and the mud-repelling effect is poor.

Method used

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  • Damping polycarboxylic acid water reducing agent as well as preparation method and special production equipment thereof
  • Damping polycarboxylic acid water reducing agent as well as preparation method and special production equipment thereof
  • Damping polycarboxylic acid water reducing agent as well as preparation method and special production equipment thereof

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preparation example Construction

[0037] The present invention also provides a preparation method of the above-mentioned mud-resistance polycarboxylate superplasticizer, comprising the following steps.

[0038] Step 1, synthesizing 4-hydroxybutyl vinyl polyoxyethylene polyoxybutylene ether;

[0039] 4-hydroxybutyl vinyl ether with a total weight of 5-15% is pre-reacted under the action of a catalyst, and the product is put into the remaining 4-hydroxybutyl vinyl ether, and a mixture of ethylene oxide and butylene oxide is added Reaction to obtain 4-hydroxybutyl vinyl polyoxyethylene polyoxybutylene ether oligomer with a molecular weight of 300-450;

[0040] Then, 5-15% of the total amount of 4-hydroxybutyl vinyl polyoxyethylene polyoxybutylene ether oligomer is pre-reacted under the action of a catalyst, and the product is put into the remaining 4-hydroxybutyl vinyl polyoxyethylene A mixture of ethylene oxide and butylene oxide is added to the polyoxybutylene ether oligomer for reaction to obtain 4-hydroxybut...

Embodiment 1

[0063] Step 1, synthesizing 4-hydroxybutyl vinyl polyoxyethylene polyoxybutylene ether.

[0064] Firstly carry out one-stage synthesis, this step synthesizes and synthesizes 4-hydroxybutyl vinyl polyoxyethylene polyoxybutylene ether oligomer, and the specific process is:

[0065]Open the discharge valve of the 4-hydroxybutyl vinyl ether storage tank, add 50Kg of 4-hydroxybutyl vinyl ether in the first-stage pre-reactor, open the stirring device to stir, and use a catalyst continuous feeder to feed a Add 0.5Kg of sodium catalyst metal into the first-stage pre-reactor, pass steam and cooling water into the jacket, keep the temperature at 25°C, and stir for 0.5h to obtain the first-stage pre-reactant.

[0066] Then, open the discharge valve of the primary reactor, put the primary pre-reactant generated into the primary reactor, and at the same time, open the discharge valve of the 4-hydroxybutyl vinyl ether storage tank, and put it into the primary reactor 950Kg of 4-hydroxybuty...

Embodiment 2

[0078] Step 1, synthesizing 4-hydroxybutyl vinyl polyoxyethylene polyoxybutylene ether.

[0079] Firstly carry out one-stage synthesis, this step synthesizes and synthesizes 4-hydroxybutyl vinyl polyoxyethylene polyoxybutylene ether oligomer, and the specific process is:

[0080] Open the discharge valve of the 4-hydroxybutyl vinyl ether storage tank, add 85Kg of 4-hydroxybutyl vinyl ether to the first-stage pre-reactor, open the stirring device to stir, and use a catalyst continuous feeder to feed a Add 1.0Kg of sodium catalyst metal into the first-stage pre-reactor, pass steam and cooling water into the jacket, keep the temperature at 30°C, and stir for 1.0h to obtain the first-stage pre-reactant.

[0081] Then, open the discharge valve of the primary reactor, put the primary pre-reactant generated into the primary reactor, and at the same time, open the discharge valve of the 4-hydroxybutyl vinyl ether storage tank, and put it into the primary reactor 915Kg of 4-hydroxybut...

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Abstract

The invention provides a damping polycarboxylic acid water reducing agent as well as a preparation method and special production equipment thereof. According to the method, firstly, 4-hydroxybutyl vinyl ether polyoxyethylene polyoxybutylene ether is synthesized; the partial 4-hydroxybutyl vinyl ether reactants are subjected to pre-reaction; products are fed into the rest reactant; ethylene oxide and epoxybutane are added for reaction to obtain 4-hydroxybutyl vinyl ether polyoxyethylene polyoxybutylene ether oligomers; then, partial oligomers are subjected to pre-reaction; the products are fedinto the rest oligomers; ethylene oxide and epoxybutane are added for reaction; the 4-hydroxybutyl vinyl ether polyoxyethylene polyoxybutylene ether is obtained; then, the 4-hydroxybutyl vinyl ether polyoxyethylene polyoxybutylene ether, the 4-hydroxybutyl vinyl ether and unsaturated monocarboxylic acid monomers are subjected to monomer polymerization reaction to generate the damping polycarboxylic acid water reducing agent. The equipment comprises a pre-reaction kettle and a reaction kettle; a polyether primary and secondary pre-reaction kettle is provided with a catalyst continuous feeding device. The damping polycarboxylic acid water reducing agent provided by the invention has a good damping effect.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, and in particular relates to a concrete mud-resistance polycarboxylate water reducer, its preparation method and special production equipment. Background technique [0002] With the explosive growth of various domestic infrastructure and commercial housing, the amount of concrete is increasing day by day, followed by the depletion of concrete aggregates, and the mud content of sand and gravel used in more and more projects Exceeded the standard. [0003] The widely used polycarboxylate superplasticizer is extremely sensitive to the mud content of sand and gravel. When sand and gravel with excessive mud content are used in concrete, in order to ensure the quality of concrete, it is necessary to increase the polycarboxylate superplasticizer. The dosage will not only increase the cost of single concrete, but also increase the dosage of polycarboxylate superplasticizer, which will cause ...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C08F220/20C08F2/01C08G65/28C04B24/26C04B103/30
CPCC04B24/2647C04B2103/302C08F2/01C08F283/065C08G65/2609C08F220/06C08F220/20
Inventor 陈刚陈学兵
Owner 武汉新绿博恩科技有限公司
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