Polymer emulsion for cement base material water reducing and its preparing method

A technology of polymer emulsion and cement-based material, applied in the field of polymer emulsion, can solve the problems of high water absorption, reducing the water resistance of polymer emulsion-modified cement-based materials, and increasing the fluidity of modified cement-based materials, etc.

Inactive Publication Date: 2005-03-02
GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to ensure the stability of the emulsion to the cement slurry, a relatively large amount of non-ionic low-molecular-weight emulsifiers and ionic low-molecular-weight emulsifiers such as commonly used sodium dodecylbenzenesulfonate and sodium dodecyl sulfate (SDS) are added. , these low-molecular emulsifiers have a certain effect on increasing the fluidity of modified cement-based materials, but will reduce the water resistance of polymer emulsion modified cement-based materials, and the water absorption rate is high

Method used

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  • Polymer emulsion for cement base material water reducing and its preparing method

Examples

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Comparison scheme
Effect test

Embodiment 1

[0041] Embodiment 1: the preparation of polymer emulsion of the present invention

[0042] Methoxylated polyethylene glycol methacrylate (number average molecular mass M n =1000) 5g, methoxylated polypropylene glycol polyethylene glycol methacrylate (M n =2000) 5g, polyethylene glycol methacrylate (M n =5000) 5g, methyl methacrylate 5g, butyl acrylate 45g, sodium styrene sulfonate 3g, sodium vinyl sulfonate 2g, styrene 30g, mix well, put into 200g of water under stirring, vigorously stir to make it emulsified. Then put 1 / 5 of the emulsion into the three-necked bottle, add 0.25g of ammonium persulfate initiator, raise the temperature to 70-72°C, and keep warm until the material turns blue. At this time, an exothermic peak will appear, and the temperature may rise to 80°C. ℃ or more. After the temperature drops, add the remaining emulsion and 0.25 g of the remaining initiator dropwise, and control the temperature in the bottle to stabilize at 70-75°C. Vacuumize to remove unr...

Embodiment 2

[0043] Embodiment 2: the preparation of polymer emulsion of the present invention

[0044] Polypropylene glycol polyethylene glycol methacrylate (M n =2000) 10g, polyethylene glycol acrylate (M n =4000) 5g, methyl methacrylate 25g, butyl acrylate 47g, ethyl methacrylate 6g, methacrylic acid 2g, trifluoroethyl methacrylate 3g, 2-acrylamido-2-methylpropanesulfonate Mix 2g of acid (AMPS) evenly, put it into 200g of water under stirring, and stir vigorously to emulsify it. Then put 80g of emulsion into a three-necked bottle, add 0.35g of potassium persulfate initiator, raise the temperature to 72-75°C, keep warm until the material turns blue, and control the temperature at about 80°C when the reaction exotherms. After the temperature drops, add the remaining emulsion and 0.35 g of the remaining initiator dropwise, and control the temperature in the bottle to stabilize at 70-75°C. Vacuumize to remove unreacted monomers, and finally cool down, and add ammonia water to adjust the ...

Embodiment 3

[0045] Embodiment 3: the preparation of polymer emulsion of the present invention

[0046] Polyethylene glycol acrylate (M n =4000) 8g, polytetramethylene glycol methacrylate (M n =2000) 4g, methoxylated polyethylene glycol methacrylate (M n =8000) 8g, methyl methacrylate 5g, butyl acrylate 7g, N-methylol acrylic acid amine 2g, polyethylene glycol methylene succinate butylsulfonate sodium 5g, methoxylated polyethylene glycol Alcohol (polymerization degree m=10) 5 g of sodium maleate hexadecyl sulfonate, 55 g of vinyl acetate, and 1 g of methylene succinic acid were evenly mixed, and were thrown into 200 g of water under stirring, and vigorously stirred to make it emulsified. Then put 50g of the emulsion into a three-necked flask, add 0.25g of potassium persulfate initiator, and raise the temperature to 75°C for polymerization. When there is no obvious reflux in the condenser, drop the remaining emulsion and 0.6 g of the remaining initiator within 2 to 2.5 hours, keep warm f...

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Abstract

The present invention relates to a kind of polymer emulsion for water reducing of cement base material and its preparation process. The present invention features that the stable polymer emulsion for reducing water of cement base material is prepared through the emulsion polymerization in water of reactive non-ionic emulsifier hydroxyl or alkyl polyalkoxylate glyucol acryl acrylic ester with double bond capable of being polymerized, matter containing sulfo radical or sulfate radical and vinyl radical as ionic emulsifier, methyl acrylate, etc. The emulsion has high water reducing and strengthening effect on cement base material and can greatly raise the work performance, physical mechanical performance and waterproof endurance of composite cement base material.

Description

technical field [0001] The invention relates to a polymer emulsion used for water reduction of cement-based materials. The emulsion has high water-reducing, strengthening and waterproof effects on cement-based materials. The invention also relates to a preparation method of the emulsion. Background technique [0002] Cement concrete is one of the building materials with the largest amount of application and the widest application range. It is rarely used alone and often needs to be modified by adding organic polymers. The polymers used to modify cement concrete include water-soluble polymers, polymer emulsions (or dispersions), redispersible polymer powders and liquid polymers. Polymer-modified cement-based composites refer to the addition of polymer materials dispersed or dispersible in water to cement paste, cement mortar and cement concrete. Performance, waterproof performance, durability, etc. will all be improved. [0003] Superplasticizers and polymer emulsions (or d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/00C04B24/16C04B24/28
Inventor 黄月文刘伟区
Owner GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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