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Method for preparing low-viscosity EVA emulsion

A low-viscosity, emulsion technology, applied in the field of preparing low-viscosity EVA emulsion, can solve the problems of poor particle shape and emulsion stability, limited application scope, and difficult product storage, etc., to maintain particle shape and toughness strength, reduce system viscosity, The effect of high industrial application value

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

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preparation example Construction

[0026] 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

[0031] Adopt ammonium persulfate as initiator, and total consumption is 0.3wt% of vinyl acetate; O / W system, surfactant op-10 consumption is 15.0wt% of VAc monomer consumption; Volatile emulsion stabilizer octanol consumption is The 0.05wt% of the VAc monomer consumption; The colloid protective agent PVA consumption is the 3.0wt% of the VAc monomer consumption; The pH regulator sodium bicarbonate consumption is 0.5wt% of the VAc monomer consumption; The reaction pressure was 75.0 MPa, the polymerization reaction time was 5 hours, and the pH value in the reaction process was controlled at 6.5. Under these conditions, the VAc content of the polymerization product is 67.2wt%, and the viscosity of the emulsion is 155mpa.s. The stability of the emulsion is good, and the emulsion can be stored stably for 9 months.

Embodiment 2

[0033] Adopt ammonium persulfate as initiator, and total consumption is 0.3wt% of vinyl acetate; O / W system, surfactant op-10 consumption is 15.0wt% of VAc monomer consumption; Volatile emulsion stabilizer octanol consumption is The 0.15wt% of the VAc monomer consumption; The colloid protective agent PVA consumption is the 3.0wt% of the VAc monomer consumption; The pH regulator sodium bicarbonate consumption is 0.5wt% of the VAc monomer consumption; The reaction pressure was 75.0 MPa, the polymerization reaction time was 5 hours, and the pH value in the reaction process was controlled at 6.5. Under these conditions, the VAc content of the polymerization product is 67.1wt%, and the viscosity of the emulsion is 141mpa.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 an alcohol compound is added at a pre-emulsification stage, then an initiator is added to initiate emulsion polymerization, and ethylene and vinyl acetate are subjected to a copolymerization reaction. The alcohol compound is preferably C6-C8 fatty alcohol and is more preferably octanol and isomeride thereof. The alcohol compound is adopted as a volatile emulsion stabilizer, the system viscosity can be remarkably reduced, the EVA emulsion product excellent in particle form and good in stability is obtained, the application range of the EVA emulsion is greatly widened, and different needs are met. 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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Patent Type & Authority Applications(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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