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Preparation method of polycarboxylate water reducer with high adaptability and high solid content

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

Inactive Publication Date: 2018-11-13
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 polycarboxylate water reducer with high adaptability and high solid content
  • Preparation method of polycarboxylate water reducer with high adaptability and high solid content
  • Preparation method of polycarboxylate water reducer with high adaptability and high solid content

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A highly adaptable high solid polycarboxylate water reducer, characterized in that: the highly adaptable high solid polycarboxylate water reducer is prepared from the following components: polyether macromonomer, azo Initiator, alcoholic organic solvent, acrylic acid, organic peroxygen initiator, solubilizer, chain transfer agent, neutralizing agent; the preparation method comprises the following steps:

[0033] 1) Add 590 parts of prenol polyoxyethylene ether and 220 parts of water into the reaction kettle, stir and heat until it dissolves;

[0034]2) Measure the temperature in the kettle, control the temperature at 70°C, and after the temperature is stable, add 2.2 parts of a composition of sodium tripolyphosphate and magnesium lauryl sulfate with a mass ratio of 1:2 at one time, and 7 parts with a mass ratio of 1:2. 1 composition of sodium styrene sulfonate and 2-acrylamide-2-methylpropanesulfonic acid, 2.5 parts of tert-butyl peroxy t-valerate and diisopropyl peroxy...

Embodiment 2

[0038] A highly adaptable high solid polycarboxylate water reducer, characterized in that: the highly adaptable high solid polycarboxylate water reducer is prepared from the following components: polyether macromonomer, azo Initiator, alcoholic organic solvent, acrylic acid, organic peroxygen initiator, solubilizer, chain transfer agent, neutralizing agent; the preparation method comprises the following steps:

[0039] 1) Add 603 parts of vinyl butyl ether polyoxyethylene ether and 210 parts of water into the reaction kettle, stir and heat until it dissolves;

[0040] 2) Measure the temperature in the kettle, control the temperature at 72°C, and after the temperature is stable, add 3.8 parts of a composition of sodium tripolyphosphate and magnesium lauryl sulfate at a mass ratio of 1:1 at one time, and 9 parts with a mass ratio of 1:1 1 composition of sodium styrene sulfonate and sodium hypophosphite, 2.8 parts of tert-butyl peroxy tert-valerate;

[0041] 3) After 5 minutes, ...

Embodiment 3

[0044] A highly adaptable high solid polycarboxylate water reducer, characterized in that: the highly adaptable high solid polycarboxylate water reducer is prepared from the following components: polyether macromonomer, azo Initiator, alcoholic organic solvent, acrylic acid, organic peroxygen initiator, solubilizer, chain transfer agent, neutralizing agent; the preparation method comprises the following steps:

[0045] 1) Add 615 parts of allyl polyoxyethylene ether and 200 parts of water into the reaction kettle, stir and heat until it dissolves;

[0046] 2) Measure the temperature in the kettle, control the temperature at 72°C, and after the temperature is stable, add 2.4 parts of a composition of sodium tripolyphosphate and sodium lauryl sulfate at a mass ratio of 2:1 at one time, and 6 parts with a mass ratio of 1: 1 composition of sodium methacrylsulfonate and 2-acrylamide-2-methylpropanesulfonic acid, 3 parts of diisopropyl peroxydicarbonate;

[0047] 3) After 5 minutes...

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Abstract

The invention provides a preparation method of a polycarboxylate water reducer with high adaptability and high solid content. The preparation method comprises the following steps: 1) adding a polyether macromonomer and water to a reactor according to a certain proportion, stirring and heating till being dissolved; 2) controlling the temperature to be 70 to 75 DEG C, starting to add a certain amount of an organic peroxygen initiator, a solubilizer and a chain transfer agent; 3) after 5min, starting to add a solution B, and after 10min, starting to add a solution A, wherein the dropping time ofthe solution A is a hours, and the dropping time of the solution B is a+0.5 hours; the solution A comprises acrylic acid and water in a certain proportion, and the solution B comprises an azo initiator and an alcohol organic solvent; 4) after dropwise adding, rising the temperature to 95 to 98 DEG C, keeping the temperature constant, curing for b hours, later cooling, slicing and packing to obtainthe polycarboxylate water reducer with the high adaptability and high solid content. The product prepared by the invention has the characteristics of high solid content, good adaptability, high water-reducing rate, good slump retention ability and the like and is suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of building materials and relates to the field of concrete admixtures, in particular to a preparation method of a highly adaptable and high solid polycarboxylate water reducer. Background technique [0002] Water reducer is an indispensable component of modern concrete. The solid content of the common polycarboxylate water reducer mother liquor produced and sold on the market is usually about 40%, because it contains a large amount of water as a solvent, resulting in costly storage and transportation. Businesses cannot ignore spending. Regardless of production enterprises or engineering units, there is a strong demand for high-solid polycarboxylate superplasticizers. The current high-solid polycarboxylate superplasticizers on the market are obtained by heating and spray-drying liquid polycarboxylate superplasticizers, which not only reduces performance, but also requires duplication of equipment, resulting ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F212/14C08F220/58C08F2/44C08F4/04C08F4/38C04B24/16C04B103/30
CPCC04B24/165C04B2103/302C08F2/44C08F4/04C08F4/38C08F283/065C08F220/06
Inventor 柯凯罗正权
Owner HUBEI UNIV OF TECH
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