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Method for preparing low-viscosity EVA emulsion

A low-viscosity, emulsion 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, reduce product viscosity, The effect of moderate VAc content

Inactive Publication Date: 2017-03-29
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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  • Method for preparing low-viscosity EVA emulsion

Examples

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preparation example Construction

[0025] Such as 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 2 and 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 communica...

Embodiment 1

[0030] Ammonium persulfate is adopted as the initiator, and the total consumption is 0.1wt% of vinyl acetate; O / W system, the dosage of surfactant op-10 is 10.0wt% of the dosage of VAc monomer; the dosage of colloidal protective agent PVA is VAc monomer The dosage is 2.0wt%; the pH regulator sodium bicarbonate dosage is 0.5wt% of the VAc monomer dosage; the polymerization reaction temperature is 75°C, the ethylene reaction pressure is 75.0MPa, the polymerization reaction time is 5h, and the pH value of the reaction process is controlled at 6.5 . The dosage of the inorganic filler magnesium carbonate is 0.01wt% of the dosage of the VAc monomer. Under these conditions, the content of VAc in the polymerization product is 65.9wt%, and the viscosity of the emulsion is 129mpa.s. The stability of the emulsion is good, and the emulsion can be stored stably for 7 months.

Embodiment 2

[0032] Ammonium persulfate is adopted as the initiator, and the total consumption is 0.1wt% of vinyl acetate; O / W system, the dosage of surfactant op-10 is 10.0wt% of the dosage of VAc monomer; the dosage of colloidal protective agent PVA is VAc monomer The dosage is 2.0wt%; the pH regulator sodium bicarbonate dosage is 0.5wt% of the VAc monomer dosage; the polymerization reaction temperature is 75°C, the ethylene reaction pressure is 75.0MPa, the polymerization reaction time is 5h, and the pH value of the reaction process is controlled at 6.5 . The dosage of the inorganic filler magnesium carbonate is 0.05wt% of the dosage of the VAc monomer. Under this condition, the VAc content of the polymerization product is 66.0wt%, and the viscosity of the emulsion is 121mpa.s. The stability of the emulsion is good, and the emulsion can be stored stably for 9 months.

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Abstract

The invention relates to a method for preparing low-viscosity EVA emulsion. The method comprises the steps that under the emulsion polymerization condition, ethylene and vinyl acetate (VAc) are subjected to a copolymerization reaction, and inorganic filler is added after the reaction is completed. The inorganic filler is water-insoluble metal carbonate, and is preferably at least one of magnesium carbonate, barium carbonate and zinc carbonate. A proper amount of inorganic filler is added into an emulsion copolymerization reaction system, the product viscosity can be remarkably reduced, and the particle form and toughness strength can be maintained. The obtained EVA emulsion product is good in stability, moderate in VAc content and excellent in performance, and can meet different needs. By means of a single-still intermittence process, the problems that multi-still operation difficulty is high, and the device cost and energy consumption are high are avoided, and high industrial application value is achieved.

Description

technical field [0001] The invention relates to a method for preparing low-viscosity EVA emulsion. 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 emulsifier aqueous solution, and the...

Claims

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Application Information

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IPC IPC(8): C08F210/02C08F218/08C08F2/30C08K3/26
Inventor 陈博于鲁强刘小萌刘金伟
Owner CHINA PETROLEUM & CHEM CORP
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