Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for synthesizing polycarboxylic acids series high-efficiency water-reducing agent

A high-efficiency water-reducing agent and polycarboxylic acid-based technology, which is applied in the synthesis field of polycarboxylic acid-based high-efficiency water-reducing agent, can solve the problems of tediousness and complexity, and achieve the effects of simple equipment, simple operation and low equipment investment.

Active Publication Date: 2010-06-16
ZHEJIANG HUANGMA TECH
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many reports on the synthesis methods of polycarboxylate superplasticizers, but most of them are cumbersome and complicated.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1: 160 parts of polyethylene glycol monomethyl ether (polymerization degree n is 23) acrylate, 35 parts of methacrylic acid and 50 parts of deionized water are mixed uniformly, and 642 parts of deionized water are added to the reactor to fill Under nitrogen, heat up to 90℃~95℃, and add the mixed solution of polyethylene glycol monomethyl ether acrylate, methacrylic acid and 75 parts of 5% ammonium persulfate solution dropwise at the same time. The dropwise time is 2.5 hours, and then dropwise. Add 20 parts of 5% ammonium persulfate solution, the dripping time is 1.0 hour, after the dripping, keep for 2.0 hours, cool to 55℃~65℃, neutralize with sodium hydroxide solution to pH 7.0~8.0, then Adjust the solid content of the solution to 20%, which is a polycarboxylic acid superplasticizer. Applied to a mortar prepared with a certain brand of cement, its water reduction rate was measured to be 27.0%. (The amount of polycarboxylic acid superplasticizer is 1% of cement ...

Embodiment 2

[0018] Example 2: 160 parts of polyethylene glycol monomethyl ether (polymerization degree n is 29) methacrylate, 25 parts of acrylic acid and 70 parts of deionized water are mixed uniformly, and 600 parts of deionized water are added to the reactor to fill Under nitrogen, the temperature was raised to 80℃~85℃, and the mixed solution of polyethylene glycol monomethyl ether methacrylate and acrylic acid and 75 parts of 5% sodium persulfate solution were added dropwise at the same time. The dropping time was 3.5 hours, and then dropped again. Add 15 parts of 5% sodium persulfate solution, the dripping time is 1.5 hours, after the dripping, keep for 2.0 hours, reduce the temperature to 55℃~65℃, neutralize with potassium hydroxide solution to pH 7.0~8.0, then Adjust the solid content of the solution to 20%, that is, polycarboxylic acid superplasticizer. Applied to a mortar prepared with a certain brand of cement, its water reduction rate was measured to be 25.0%. (The amount of po...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
water reduction rateaaaaaaaaaa
water reduction rateaaaaaaaaaa
Login to View More

Abstract

A synthesizing process of a polycarboxylic acid series high efficiency water reducing agent belongs to the synthesizing technique filed of the concrete additive, the methosypolyethyleme glycols (methyl) acrylate and (methyl) acrylic acid is taken as the raw material, the invention is characterized in that firstly the two raw materials are added with water to a mixed solution, then the water solution filled with nitrogen gas is dropped with mixed solution and the initiating solution to do copolymerization reaction, when the copolymerization is finished the alkaline compound is used for adjusting pH value to prepare the polycarboxylic acid series high efficiency water reducing agent; the molar ratio of the methosypolyethyleme glycols (methyl) acrylate and (methyl) acrylic acid is 1:2.0-8.0;the initiating agent comprises ammonium persulphate or sodium persulfate and potassium persulfate and the like, and the adding amount is 0.01-5.0% of the gross weight percentage of methosypolyethylemeglycols (methyl) acrylate and (methyl) acrylic acid. The method of the invention has the advantages of reasonable technique, simple operation, moderate reaction condition, simple adopted equipment and little equipment investment.

Description

Technical field [0001] The invention relates to a method for synthesizing a polycarboxylate superplasticizer, belonging to the technical field of the synthesis of concrete admixtures. Background technique [0002] Polycarboxylic acid superplasticizer is the third generation of high performance superplasticizer developed after common superplasticizer represented by wood calcium and superplasticizer represented by naphthalene series. This type of water reducing agent has the advantages of low dosage, high water reducing rate, non-segregation, non-bleeding, good maintenance of concrete slump performance, good compatibility with cement, admixtures and other additives, and can be formulated to produce ultra-high strength and Ultra-durable concrete can effectively reduce the early adiabatic temperature rise of concrete and reduce the temperature cracks of large-volume concrete. It has a large degree of freedom in molecular structure design and has a greater potential for achieving high...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/26C04B103/30
CPCC04B24/2641
Inventor 王伟松王新荣孟照平王胜利朱红军
Owner ZHEJIANG HUANGMA TECH