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

Preparation method of cosolvent by compounding concrete admixture

A technology of concrete admixture and co-solvent, applied in the field of high-efficiency concrete water reducing agent, can solve problems such as mutual incompatibility, and achieve the effect of simple preparation process and easy control of reaction conditions

Inactive Publication Date: 2012-07-04
JIANG SU TMS CONCRETE ADDITION AGENT
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the concrete compounding admixture in actual production, which is to provide polycarboxylic acid compounding with different molecular structures without delamination
[0004] The preparation method of the co-solvent used for compounding concrete admixtures of the present invention solves the problem that the system is naturally divided into two immiscible phases, and proceeds according to the following steps:

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

[0012] Add 300 grams of methyl-terminated polyethylene glycol with a molecular weight of 1500 and 65 grams of acrylic acid containing 3% propylene oxide (molar ratio) into the reaction flask, add 20 milliliters of benzene, and feed nitrogen for 20 minutes. Under nitrogen protection, add compound Catalyst (wherein the composite catalyst is a mixture of p-toluenesulfonic acid and sodium bisulfate with a mass ratio of 1:1) was reacted at 115-120° C. for 6 hours. Add diluting water, and add the ammonium persulfate aqueous solution dropwise into water at 90°C for 3 hours. After the dropwise addition is completed, the temperature is raised to 95°C for 1 hour, the temperature is lowered to 50°C, and liquid caustic soda is added to adjust the pH value to 5-7. A water-soluble polymer co-solvent with a solid content of 23% was obtained.

[0013] Two-phase aqueous system: 20 grams of lipid polycarboxylate superplasticizer, 20 grams of ether polycarboxylate, 2 grams of polysaccharides, a...

Embodiment 2

[0017] Add 300 grams of methyl-terminated polyethylene glycol containing 10% propylene oxide (molar ratio), molecular weight 600, and 200 grams of methyl methacrylate into the reaction flask, feed nitrogen for 20 minutes, and add the composite catalyst under nitrogen protection. (wherein the composite catalyst is a mixture of p-toluenesulfonic acid and sulfuric acid with a mass ratio of 1:1) 20 g, fractionated and refluxed at 110° C. for 6 hours. Add dilution water and a certain proportion of ferrous sulfate, and add hydrogen peroxide dropwise at 75-80°C for 5 hours. After the dropwise addition, raise the temperature to 85°C to react for 1 hour, cool down to 50°C, add liquid caustic soda, and adjust the pH value to 5-7. A water-soluble polymer co-solvent with a solid content of 45% was obtained.

[0018] Two-phase aqueous system: 40 grams of lipid polycarboxylate superplasticizer, 40 grams of ether polycarboxylate, 3 grams of polysaccharides, and 17 grams of water.

[0019] ...

Embodiment 3

[0022] The reaction flask was added with 4% propylene oxide (molar ratio), 300 grams of terminal methyl polyethylene glycol and 140 grams of methacrylic acid containing 4% propylene oxide (molar ratio), molecular weight, 140 grams of methacrylic acid, passed into nitrogen for 20 minutes, under nitrogen protection, added composite catalyst (wherein The composite catalyst is a mixture of sodium bisulfate and sulfuric acid with a mass ratio of 1:1) and reacts at 120-125° C. for 6 hours. Add dilution water and a certain proportion of thioglycolic acid, and add sodium persulfate aqueous solution dropwise at 75-80°C for 3 hours. After adding the aqueous sodium persulfate solution, raise the temperature to 85°C to react for 1 hour, cool down to 50°C, add liquid caustic soda, and adjust the pH to 5-7. A water-soluble polymer co-solvent with a solid content of 40% was obtained.

[0023] Two-phase aqueous system: 25 grams of lipid polycarboxylate superplasticizer, 15 grams of ether pol...

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

No PUM Login to View More

Abstract

The invention discloses a preparation method of a cosolvent by compounding a concrete admixture, comprising the following steps of: (1) esterification reaction: mixing methyl-terminated polyethylene glycol containing 5-20 percent of cyclopropane in the mol ratio with methacrylic acid or acrylic acid with the mol ratio of 1:(2.5-10) and reacting at the temperature of 105-125DEG C for 3-6 hours; (2) polymerization reaction: adding water in the prepared carboxylate for diluting, adding an initiator the addition quantity of which is 2-13 percent of the mass of total reactants and reacting at the temperature of 70-90DEG C for 2.5-6 hours; (3) neutralization reaction: adding alkali in the substances and adjusting the pH value to be 5-7 to obtain a high polymer cosolvent; and (4) adding the neutralized water-soluble high polymer cosolvent in a polycarboxylic acid superplastic agent. After the cosolvent is added according a certain proportion, the solution is not demixed; and the preparation process is simpler and the reaction conditions are easy to control.

Description

technical field [0001] The invention relates to a method for preparing a concrete water-reducer, in particular to a method for preparing a non-layered high-efficiency concrete water-reducer by compounding polycarboxylic acid precursors with different molecular structures and adding a cosolvent. Background technique [0002] At present, polycarboxylic acid polymers have been promoted and widely used as high-efficiency concrete water reducing agents. Due to the needs of functions, the ratio of ethylene oxide to propylene oxide in the branched chain is intentionally adjusted in the molecular structure of polycarboxylic acid. , or due to the same molecular structure due to different degrees of polymerization, two or more such water-soluble polymer solutions, after mixing and compounding, when the concentration reaches a certain value, the system will naturally divide into mutually immiscible Two phases, both phases contain water, forming a two-phase water system, resulting in th...

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): C08F283/06C04B24/26
Inventor 陈国忠陈炜徐大勇彭振华宋树贵
Owner JIANG SU TMS CONCRETE ADDITION AGENT