Preparation method of slow-release polycarboxylic acid water reducing agent

A technology of slow-release polycarboxylic acid and water reducing agent, which is applied in the field of preparation of slow-release polycarboxylic acid water reducing agent, can solve the problems of low system activity and narrow application range, and can meet the requirements of normal temperature polymerization and better effect. , the effect of wide adaptability

Inactive Publication Date: 2017-06-23
JIANGSU SAILBOAT PETROCHEMICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Commonly used hydrogen peroxide-VC system initiator, the system activity is low, the

Method used

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  • Preparation method of slow-release polycarboxylic acid water reducing agent
  • Preparation method of slow-release polycarboxylic acid water reducing agent
  • Preparation method of slow-release polycarboxylic acid water reducing agent

Examples

Experimental program
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Example Embodiment

[0021] Embodiment 1, a kind of preparation method of slow-release polycarboxylate superplasticizer, its steps are as follows:

[0022] (1) Prepare 1# dropping solution: Mix acrylic acid, acrylate and deionized water to obtain an aqueous solution with a mass percentage of 55%-65%, where the mass ratio between acrylic acid, acrylate and deionized water is 72: 464:288;

[0023] (2) Preparation of 2# dripping liquid: Mix reducing agent, chain transfer agent, 30% liquid alkali and deionized water to prepare an aqueous solution with a mass percentage of 5%-10%, of which reducing agent, chain transfer agent, 30% The mass ratio between liquid caustic soda and deionized water is 5:15:15:470;

[0024] (3) Add deionized water to the enamel reaction kettle equipped with a thermometer, agitator, double dropping pipe and reflux condenser, start stirring, put in polycarboxylic acid macromonomer, and add maleic acid ester and concentrated sulfuric acid to accelerate The polycarboxylate macr...

Example Embodiment

[0025] Embodiment 2, a kind of preparation method of slow-release polycarboxylate superplasticizer, its steps are as follows:

[0026] (1) Prepare 1# dropping solution: Mix acrylic acid, acrylate and deionized water to obtain an aqueous solution with a mass percentage of 55%-65%, where the mass ratio between acrylic acid, acrylate and deionized water is 180: 650: 447;

[0027] (2) Preparation of 2# dripping liquid: Mix reducing agent, chain transfer agent, 30% liquid alkali and deionized water to prepare an aqueous solution with a mass percentage of 5%-10%, of which reducing agent, chain transfer agent, 30% The mass ratio between liquid alkali and deionized water is 10: 30: 30: 950;

[0028] (3) Add deionized water to the enamel reaction kettle equipped with a thermometer, agitator, double dropping pipe and reflux condenser, start stirring, put in polycarboxylic acid macromonomer, and add maleic acid ester and concentrated sulfuric acid to accelerate The polycarboxylate macr...

Example Embodiment

[0029] Embodiment 3, in the preparation method of the slow-release polycarboxylate superplasticizer described in embodiment 1 and 2: acrylate is methyl acrylate, butyl acrylate, ethyl acrylate, hydroxyethyl acrylate, hydroxypropyl acrylate one or more of.

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Abstract

The invention relates to a preparation method of a slow-release polycarboxylic acid water reducing agent. The method comprises the following steps: preparing a 1# dropwise addition solution and a 2# dropwise addition solution; and adding deionized water into a reaction kettle, starting stirring, adding polycarboxylic acid big monomers, adding maleate and concentrated sulfuric acid to accelerate the dissolution of the polycarboxylic acid big monomers so as to obtain a 50-65 wt% solution, adding an oxidizer, stirring for 3-6 minutes, dropwisely adding the 2# dropwise addition solution at uniform speed, dropwisely adding the 1# dropwise addition solution at uniform speed after 2-10 minutes, aging for 1 hour by keeping the temperature, adding 30% liquid caustic soda until the pH value reaches 6-7, and supplementing deionized water to obtain the slow-release polycarboxylic acid water reducing agent of which the solid content is 40-45%. The method has the advantages of wider adaptability and better effects. By introducing ester bonds to the side chain, the effective group carboxyl of the water reducing agent is generated by hydrolysis in the concrete alkaline environment, thereby ensuring the continuous release capacity of the product.

Description

technical field [0001] The invention relates to a preparation method of a polycarboxylate water reducer, in particular to a preparation method of a slow-release polycarboxylate water reducer. Background technique [0002] The existing polycarboxylate superplasticizers are mainly made of macromonomers with a certain molecular weight distribution, which are relatively simple. The free radical polymerization of acrylic acid and acrylate esters is used, and the release speed of esters in an alkaline environment needs to be improved; the reaction base material is generally a polyether aqueous solution, and the early stage of dropping is in a neutral environment and the later stage is in an acidic environment. [0003] The commonly used hydrogen peroxide-VC system initiator has low system activity and is heated to a certain temperature at the initial stage, so the scope of application is narrow. Contents of the invention [0004] The technical problem to be solved by the presen...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C08F220/14C08F220/18C08F220/28C08F222/14C04B24/26C04B103/30
CPCC04B24/2694C08F283/065C04B2103/302C08F220/281C08F220/1802C08F220/1804
Inventor 王笑平赵光赫董海波邓运辉周雪平
Owner JIANGSU SAILBOAT PETROCHEMICAL CO LTD
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