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A method for preparing low-viscosity eva emulsion by controlling stirring rate

A stirring speed, low viscosity technology, applied in the field of preparation of low viscosity EVA emulsion, can solve the problems of poor particle shape and emulsion stability, limited application range, difficult storage of products, etc., to maintain particle shape and toughness strength, reduce system viscosity , the effect of reducing the number of micelles in the system

Active Publication Date: 2019-02-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, the product prepared by the existing EVA emulsion polymerization process has high viscosity, poor particle shape and emulsion stability, the product is not easy to store, and the application range is limited.

Method used

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  • A method for preparing low-viscosity eva emulsion by controlling stirring rate

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preparation example Construction

[0030] like figure 1 The shown copolymerization reaction device for the preparation of low-viscosity EVA emulsion. A single-pot batch operation is adopted, including a copolymerization reactor 1, a feeding mechanism and a product post-treatment part. Described copolymerization reactor 1 top is provided with emulsifier / colloid protective agent feed inlet, initiator feed inlet, pH value adjuster feed inlet and vinyl acetate liquid phase feed inlet, and N 2and ethylene feed port. The emulsifier / colloid protective agent tank 2 is communicated with the copolymerization reactor 1 through the high-pressure metering pump 6-2, the initiator tank 3 is communicated with the copolymerization reactor 1 through the high-pressure metering pump 6-3, and the pH value regulator tank 4-1 is communicated with the copolymerization reactor 1 through the high-pressure metering pump 6-3. The metering pump 6-4 communicates with the copolymerization reactor 1, and the VAc monomer tank 5 communicates ...

Embodiment 1

[0035] Using ammonium persulfate as initiator, the consumption is 0.3wt% of vinyl acetate; O / W system, the dosage of surfactant op-10 is 10.0wt% of the dosage of VAc monomer; the dosage of colloid protective agent PVA is the dosage of VAc monomer 3.0wt% of VAc; pH regulator sodium bicarbonate dosage is 0.5wt% of VAc monomer dosage; polymerization reaction temperature is 80 DEG C, ethylene reaction pressure is 75.0MPa, and the pH value of the reaction process is controlled at 6.5. The stirring speed in the pre-emulsification stage was 40r / min, the stirring speed in the polymerization stage was 80r / min, and the polymerization reaction time was 4.5h. Under these conditions, the content of VAc in the polymerization product was 61.9wt%, the viscosity of the emulsion was 146mpa.s, the stability of the emulsion was good, and the emulsion could be stored stably for 6 months.

Embodiment 2

[0037] Using ammonium persulfate as initiator, the consumption is 0.3wt% of vinyl acetate; O / W system, the dosage of surfactant op-10 is 10.0wt% of the dosage of VAc monomer; the dosage of colloid protective agent PVA is the dosage of VAc monomer 3.0wt% of VAc; pH regulator sodium bicarbonate dosage is 0.5wt% of VAc monomer dosage; polymerization reaction temperature is 80 DEG C, ethylene reaction pressure is 75.0MPa, and the pH value of the reaction process is controlled at 6.5. The stirring speed in the pre-emulsification stage was 45r / min, the stirring speed in the polymerization stage was 85r / min, and the polymerization reaction time was 4.5h. Under these conditions, the content of VAc in the polymerization product is 61.8wt%, the viscosity of the emulsion is 120mpa.s, the stability of the emulsion is good, and the emulsion can be stored stably for 7 months.

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Abstract

The invention relates to a method for preparing low-viscosity EVA emulsion by controlling the stirring speed. The method comprises the following steps: dissolving vinyl acetate (VAc) in water in the presence of an emulsifier and stirring at a first stirring speed to obtain monomer solubilized micelle in the pre-emulsifying phase; in the polymerizing reaction phase, adding an initiator into the monomer solubilized micelle obtained in the step 1, introducing ethylene and stirring at a second stirring speed to perform emulsion copolymerization reaction on ethylene and the VAc monomer, wherein the second stirring speed is more than the first stirring speed. According to the method, the stirring speed is controlled by two steps, so that self-agglutination due to over low stirring speed and uneven monomer droplet dispersion and gel demulsification phenomenon caused by overhigh stirring speed in the prior art can be effectively avoided, the emulsion binding strength and stability can be improved, the system viscosity can be effectively reduced, the particle shape can be maintained, adhesion occurrence can be prevented, and the emulsion product is stable and smooth and has long storage time.

Description

technical field [0001] The invention relates to a method for preparing low-viscosity EVA emulsion by controlling the stirring rate. Background technique [0002] The EVA emulsion produced by emulsion polymerization has a moderate content of vinyl acetate (VAc), and the product has excellent flexibility, transparency, low temperature flexibility, weather resistance, chemical corrosion resistance and compatibility with fillers and color masterbatches sex. EVA emulsion products have high strength, non-toxic and environmental protection, and excellent bonding performance. They can be used in textiles, light industry, coatings, plastic toughening, construction materials, polymer blending coatings, rubber modification and other fields. They are widely used. The demand at home and abroad continues to increase, and it has developed rapidly in recent years. In the prior art, the method for preparing EVA emulsion includes adding VAc monomer and colloidal protective agent into an emu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F210/02C08F218/08C08F2/30
Inventor 陈博于鲁强刘小萌刘金伟
Owner CHINA PETROLEUM & CHEM CORP
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