Method for preparing EVA emulsion by adding alcohol solvent

A technology of alcohol solvent and emulsion, which is applied in the field of preparing EVA emulsion by adding alcohol solvent, can solve the problems of cumbersome manipulation, high cost and energy consumption, long polymerization reaction time, etc. Effect of polymerization time

Active Publication Date: 2017-03-29
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The initiators selected for the above processes are also water-soluble initiators, and the O / W emulsion polymerization system is selected, which also has problems such as too long polymerization reaction time, cumbersome operation of the multi-tank series process, and high cost and energy consumption.

Method used

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  • Method for preparing EVA emulsion by adding alcohol solvent

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preparation example Construction

[0028] Such as figure 1 The shown copolymerization reaction device for preparing EVA elastomer emulsion. A single-pot batch operation is adopted, including a copolymerization reactor 1, a feeding mechanism and a product post-treatment part. The top of the copolymerization reactor 1 is provided with a surfactant, an initiator, a pH regulator and a 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 with the copolymerization reactor 1 through the high-pressure m...

Embodiment 1

[0033] In the aqueous phase polymerization system, methanol is added as the second solvent, and the volume ratio of methanol to vinyl acetate is 1:2; the initiator is azobisisobutyronitrile, and the dosage is 0.5wt% of vinyl acetate; the surfactant The op-10 consumption is 10.0wt% of the VAc monomer consumption; the pH regulator sodium bicarbonate consumption is 0.5wt% of the VAc monomer consumption; the colloid protective agent PVA consumption is 3.0wt% of the VAc monomer consumption; The temperature is 65°C, and the ethylene reaction pressure is 8.0MPa. Under this condition, the VAc content in the polymerization product was 61.9 wt%, and the polymerization reaction time was 1.8 h.

Embodiment 2

[0035] In the aqueous phase polymerization system, methanol is added as the second solvent, and the volume ratio of methanol to vinyl acetate is 1:2.5; the initiator is azobisisobutyronitrile, and the dosage is 0.5wt% of vinyl acetate; the surfactant The op-10 consumption is 10.0wt% of the VAc monomer consumption; the pH regulator sodium bicarbonate consumption is 0.5wt% of the VAc monomer consumption; the colloid protective agent PVA consumption is 3.0wt% of the VAc monomer consumption; The temperature is 65°C, and the ethylene reaction pressure is 8.0MPa. Under this condition, the VAc content in the polymerization product was 62.3 wt%, and the polymerization reaction time was 2.2 hours.

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Abstract

The present invention provides a method for preparing an EVA emulsion by adding an alcohol solvent. The method comprises: in a water phase solvent, carrying out an emulsion copolymerization reaction on ethylene and a vinyl acetate (VAc) monomer, and adding an alcohol compound as a second solvent during the copolymerization process. According to the present invention, the method has advantages of polymerization rate controlling, significantly-reduced product viscosity, particle morphology and toughness strength maintaining, and polymerization reaction time shortening; and the obtained EVA emulsion product has advantages of good stability, moderate VAc content and excellent performance, and can meet different needs.

Description

technical field [0001] The invention relates to a method for preparing EVA emulsion by adding alcohol solvent. Background technique [0002] The research work on ethylene-vinyl acetate copolymer has been carried out abroad since the early 1950s. The corresponding product is EVA latex, wherein the VAc content is 70.0-95.0wt%, which is mainly used for the preparation of coatings, coatings, adhesives and conductive materials, and is generally produced by emulsion polymerization. Compared with traditional polyvinyl acetate (PVAc) emulsion, EVA emulsion has excellent internal plasticization, alkali resistance, high temperature resistance and creep resistance. The reaction rate of EVA emulsion polymerization is high, the molecular weight of the polymerization product is high, the reaction system is conducive to the mixing and heat transfer of various raw materials, the residual monomer is easy to remove, and the process is highly controllable. In the high-pressure reactor, the i...

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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