Preparation method of high-adaptability high-solid-content polycarboxylic acid slump retaining agent

An adaptable, high-solids technology, applied in the fields of building materials and concrete admixtures, can solve the problems of performance decline, high cost, equipment duplication, etc., and achieve stable molecular weight distribution, enlarged molecular weight distribution, and smooth transition effects.

Inactive Publication Date: 2018-09-07
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current high-solid polycarboxylate superplasticizers on the market are obtained by heating and spray-drying liquid polycarboxylate superplasticizers. Not only the performance has declined, but also the cost of equipment duplication is high.

Method used

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  • Preparation method of high-adaptability high-solid-content polycarboxylic acid slump retaining agent
  • Preparation method of high-adaptability high-solid-content polycarboxylic acid slump retaining agent
  • Preparation method of high-adaptability high-solid-content polycarboxylic acid slump retaining agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033]A method for preparing a high-adaptability high-solid polycarboxylate slump-retaining agent, the highly-adaptable high-solid-content polycarboxylate slump-retaining agent is prepared from the following components: polyether macromonomer, azo initiator substance, alcohol organic solvent, alkyl acrylate, acrylic acid, organic peroxy initiator, solubilizer, chain transfer agent, neutralizing agent, water; the total mass is 1000 parts, and the preparation method comprises the following steps:

[0034] 1) Add 580 parts of vinyl butyl ether polyoxyethylene ether and 180 parts of water into the reaction kettle, stir and heat until it dissolves;

[0035] 2) Measure the temperature in the kettle, control the temperature at 75°C, and after the temperature is stable, add 4 parts of the composition of sodium lauryl sulfate and magnesium lauryl sulfate with a mass ratio of 2:1 at one time, and 10 parts with a mass ratio of A 1:1 composition of sodium vinylsulfonate and 2-acrylamide-2...

Embodiment 2

[0039] A method for preparing a high-adaptability high-solid polycarboxylate slump-retaining agent, the highly-adaptable high-solid-content polycarboxylate slump-retaining agent is prepared from the following components: polyether macromonomer, azo initiator substance, alcohol organic solvent, alkyl acrylate, acrylic acid, organic peroxy initiator, solubilizer, chain transfer agent, neutralizing agent, water; the total mass is 1000 parts, and the preparation method comprises the following steps:

[0040] 1) Add 605 parts of prenol polyoxyethylene ether and 200 parts of water into the reaction kettle, stir and heat until it dissolves;

[0041] 2) Measure the temperature in the kettle, control the temperature at 74°C, and after the temperature is stable, add 2.5 parts of a composition of sodium tripolyphosphate and magnesium lauryl sulfate with a mass ratio of 2:1 at one time, and 6 parts with a mass ratio of 1: 1 composition of sodium vinylsulfonate and 2-acrylamide-2-methylpro...

Embodiment 3

[0045] A method for preparing a high-adaptability high-solid polycarboxylate slump-retaining agent, the highly-adaptable high-solid-content polycarboxylate slump-retaining agent is prepared from the following components: polyether macromonomer, azo initiator substance, alcohol organic solvent, alkyl acrylate, acrylic acid, organic peroxy initiator, solubilizer, chain transfer agent, neutralizing agent, water; the total mass is 1000 parts, and the preparation method comprises the following steps:

[0046] 1) Add 570 parts of methallyl polyoxyethylene ether and 185 parts of water into the reaction kettle, stir and heat until it dissolves;

[0047] 2) Measure the temperature in the kettle and control the temperature at 73°C. After the temperature is stable, add 2.8 parts of sodium tripolyphosphate, 7 parts of 2-acrylamide-2-methylpropanesulfonic acid, and 3 parts of diisodicarbonate peroxide at one time. Propyl ester;

[0048] 3) After 5 minutes, start to drop solution B and sol...

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Abstract

The invention provides a preparation method of high-adaptability high-solid-content polycarboxylic acid slump retaining agent. The preparation method comprises the following steps: (1) adding polyether macro monomers and water in a given ratio into a reaction kettle, stirring, heating, and dissolving; (2) controlling the temperature at 70 to 75 DEG C, adding a given amount of solubilizer, chain transferring agent and organic peroxide initiator; (3) 5 minutes later, dropwise adding a solution B, 10 minutes later dropwise adding a solution A, wherein the addition time of the solution A is a hour, the addition time of the solution B is (a+0.5) hours, the solution A is prepared from acrylic alkyl ester, acrylic acid and water in a given ratio, and the solution B is prepared from an azo initiator, an alcohol organic solvent and water; and (4) after the dropwise addition is completed, raising the temperature to 95 to 98 DE C, keeping the temperature constant, curing for b hours, then cooling, slicing, and packaging, thus obtaining the high-adaptability high-solid-content polycarboxylic acid slump retaining agent with the solid content of 92 to 98 percent. The product obtained by the method provided by the invention has the characteristics of high solid content, good adaptability, good slump retaining performance and the like and is suitable for industrialized production.

Description

technical field [0001] The invention belongs to the technical field of building materials, relates to the field of concrete admixtures, in particular to a preparation method of a polycarboxylic acid slump-retaining agent with high adaptability and high solid content. Background technique [0002] As an indispensable raw material for ready-mixed concrete, slump-retaining agent has a huge demand for its dosage. Like ordinary polycarboxylate superplasticizers, the solid content of ordinary polycarboxylate slump-retaining agents is generally about 40%, because it contains a large amount of water as a solvent, resulting in storage and transportation costs that cannot be ignored by enterprises. Regardless of production enterprises or engineering units, there is a strong demand for high-solid polycarboxylate slump inhibitors. The current high-solid polycarboxylate superplasticizers on the market are obtained by heating and spray-drying liquid polycarboxylate superplasticizers. Not...

Claims

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Application Information

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IPC IPC(8): C04B24/16C08F283/06C08F220/06C08F220/20C08F228/02C08F220/58C08F2/38C08F2/02
CPCC04B24/165C08F2/02C08F2/38C08F283/065C08F220/585
Inventor 柯凯罗正权
Owner HUBEI UNIV OF TECH
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