Preparation method of viscosity-reducing type polycarboxylate superplasticizer

A technology of viscous polycarboxylate and water reducer, applied in the field of polycarboxylate water reducer, can solve problems such as lack of designability, environmental pollution, complicated steps, etc., to reduce viscosity and thixotropy, transport Convenience and stable performance

Inactive Publication Date: 2015-01-07
JIANGSU CHINA RAILWAY ARIT NEW MATEIRALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current preparation scheme of this type of water reducer is not designable at the level of molecular structure, and the steps are

Method used

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  • Preparation method of viscosity-reducing type polycarboxylate superplasticizer
  • Preparation method of viscosity-reducing type polycarboxylate superplasticizer
  • Preparation method of viscosity-reducing type polycarboxylate superplasticizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Step 1) Preparation of small unsaturated primary amine monomers: 1 mol of maleic anhydride and 0.9 mol of dimethylamine were stirred at 5°C for 24 hours to generate small unsaturated primary amine monomers;

[0025] 2) Preparation of small unsaturated monomers of quaternary ammonium salts: add 1.9 mol of ethylene oxide and 0.85 mol of methyl bromide to the reaction system of 1 mol of unsaturated primary amine small monomers generated above and continue to stir at 0°C for 72 hours to obtain the product quaternary Small unsaturated monomers of ammonium salts;

[0026] 3) Preparation of viscosity-reducing water reducer: 20 g of quaternary ammonium salt unsaturated small monomers, 2 g of methyl acrylate, 30 g of acrylic acid and methoxypolyethylene glycol monomethyl ether (meth)acrylate (M n =300g / mol) 300g was first added to the reactor and stirred evenly, then 0.6g hydrogen peroxide and 0.6g mercaptopropionic acid aqueous solution were added dropwise respectively, and the...

Embodiment 2

[0028] Step 1) Preparation of small unsaturated primary amine monomers: Stir 0.1 mol of itaconic anhydride and 0.11 mol of diethylamine at 10°C for 21 hours to generate small unsaturated primary amine monomers;

[0029]2) Preparation of small unsaturated monomers of quaternary ammonium salts: add 2.1 mol of propylene oxide and 1.2 mol of bromoethane to the reaction system of 1 mol of unsaturated primary amine small monomers generated above and continue to stir at 5°C for 60 hours to obtain the product Small unsaturated monomers of quaternary ammonium salts;

[0030] 3) Preparation of viscosity-reducing water reducer: quaternary ammonium salt unsaturated small monomer 30g, ethyl acrylate 10g, sodium acrylate 20g and methoxypolyethylene glycol acrylate (M n =800g / mol) 360g is first added in the reactor, stirred evenly, then respectively dripped ammonium persulfate 0.9g and 3g 2-mercaptopropionic acid aqueous solution, kept temperature 45 ℃, after reacting for 4 hours, obtained c...

Embodiment 3

[0032] Step 1) Preparation of small unsaturated primary amine monomers: Stir 1 mol of fumaric anhydride and 1 mol of diethylamine at 15° C. for 18 hours to generate small unsaturated primary amine monomers;

[0033] 2) Preparation of small unsaturated monomers of quaternary ammonium salts: add 2 mol of 1,2-epoxybutane and 0.85 mol of methyl iodide to the reaction system of 1 mol of unsaturated primary amine small monomers generated above and continue to stir at 10°C for 54 hours Obtain the product quaternary ammonium salt unsaturated small monomer;

[0034] 3) Preparation of viscosity-reducing water reducer: quaternary ammonium salt unsaturated small monomer 10g, butyl acrylate 40g, acrylic amine 30g and polyethylene glycol acrylate (M n =1000g / mol) 300g was first added to the reactor, stirred evenly, then dripped 0.5g of potassium persulfate and 0.1g of 3-mercaptopropionic acid aqueous solution respectively, kept the temperature at 50°C, and reacted for 4.5 hours to obtain th...

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Abstract

The invention relates to a preparation method of a viscosity-reducing type polycarboxylate superplasticizer. The preparation method comprises the following specific steps: firstly stirring acid anhydride small monomers containing unsaturated double bonds and binary primary amine type organic small molecules at a certain temperature to generate unsaturated primary amine type small monomers; then adding organic small molecules containing epoxy groups and the organic small molecules containing halogen groups into a generated reaction system of the unsaturated primary amine type small monomers and continuously stirring for 5-72h to obtain products, namely quaternary ammonium salt type unsaturated small monomers; and further performing water-phase free radical polymerization reaction on the quaternary ammonium salt type unsaturated small monomers, unsaturated ester type small monomers, unsaturated acid type small monomers and unsaturated polyester large monomers under the action of an initiator and a chain transfer agent, adjusting the pH value after the reaction and adding water to obtain the viscosity-reducing type polycarboxylate superplasticizer. The viscosity-reducing type polycarboxylate superplasticizer prepared by the method provided by the invention has the advantages of simple reaction, easiness in control, low cost and the like. Furthermore, the viscosity of concrete can be reduced, the slump retention can be improved.

Description

technical field [0001] The invention relates to the technical field of a polycarboxylate water reducer for cement concrete, in particular to a method for preparing a viscosity-reducing polycarboxylate water reducer using amino-epoxy ring-opening reaction and free radical polymerization . Background technique [0002] With the development of large-scale and high-rise concrete structures, the strength of engineering concrete has been continuously improved, and high-strength (C60-C100) and even ultra-high-strength (>C100) concrete have appeared. Methods to improve the strength of concrete include using high-strength grade cement, increasing the amount of unilateral cement, increasing the total amount of cementitious materials, reducing the water-cement ratio, etc. Only using these measures will lead to an increase in the viscosity of concrete and a decrease in fluidity; Segregation and bleeding will easily occur due to improper proportioning and poor aggregate gradation. I...

Claims

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Application Information

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IPC IPC(8): C08F290/06C08F222/38C08F220/14C08F220/06C08F220/16C08F220/56C08F220/58C08F220/60C04B24/26C04B103/30
Inventor 钱珊珊丁蓓
Owner JIANGSU CHINA RAILWAY ARIT NEW MATEIRALS CO LTD
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