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Method for extracting pure ethylene-vinyl acetate copolymer

A technology of vinyl acetate and copolymers, which is applied in the field of rapid extraction of pure ethylene-vinyl acetate copolymers, can solve the problems of low purity of ethylene vinyl acetate copolymers and the qualitative influence of ethylene vinyl acetate copolymers, and achieve qualitative results Effect

Active Publication Date: 2016-07-20
上海微谱检测科技集团股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the prior art, there are many separation ethylene-vinyl acetate copolymers, but the purity of the isolated ethylene-vinyl acetate copolymers is not high, which has a great impact on the qualitative properties of ethylene-vinyl acetate copolymers

Method used

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  • Method for extracting pure ethylene-vinyl acetate copolymer
  • Method for extracting pure ethylene-vinyl acetate copolymer
  • Method for extracting pure ethylene-vinyl acetate copolymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Take about 1g of component 1# after mixing evenly,

[0052] Dissolve 1# in the first solvent, partially dissolve the hot melt adhesive in methyl acetate, and separate to obtain insoluble matter;

[0053] Heating and dissolving the insoluble matter in petroleum ether, dissolving part of the insoluble matter in petroleum ether, and separating to obtain a solution;

[0054] drying the obtained solution to obtain the sample to be tested;

[0055] Add the sample to be tested into a beaker filled with chloroform;

[0056] Heat to dissolve the sample to be tested completely;

[0057] Cool at room temperature and place it in a fume hood to volatilize naturally. With the volatilization of the solvent, a precipitate will adhere to the wall of the beaker, and the precipitate is pure ethylene-vinyl acetate copolymer.

[0058] Send TGA to detect precipitates. The obtained TGA spectrum is shown in figure 1 , VA%=35.6% is obtained by calculation, and the actual VA content of EVA2...

Embodiment 2

[0060] Take about 1g of component 2# after mixing evenly,

[0061] Dissolve 1# in the first solvent, partially dissolve the hot melt adhesive in butyl acetate, and separate to obtain insoluble matter;

[0062] The insoluble matter is heated and dissolved in ethanol, the insoluble matter is partially dissolved in ethanol, and the solution is obtained by separation;

[0063] drying the obtained solution to obtain the sample to be tested;

[0064] Add the sample to be tested into a beaker filled with xylene;

[0065] Heat to dissolve the sample to be tested completely;

[0066] Cool at room temperature and place it in a fume hood to volatilize naturally. With the volatilization of the solvent, a precipitate will adhere to the wall of the beaker, and the precipitate is pure ethylene-vinyl acetate copolymer.

[0067] Send TGA to detect precipitates. The obtained TGA spectrum is shown in figure 2 , VA%=33.1% is obtained through calculation, and the actual VA content of EVA2815...

Embodiment 3

[0069] Get about 1g of component 3# after mixing evenly,

[0070] Add the sample to be tested into a beaker filled with toluene;

[0071] Heating to completely dissolve the sample to be tested;

[0072] Cool at room temperature and place it in a fume hood to volatilize naturally. With the volatilization of the solvent, a precipitate will adhere to the wall of the beaker, and the precipitate is pure ethylene-vinyl acetate copolymer.

[0073] Send TGA to detect precipitates. The obtained TGA spectrum is shown in image 3 , VA%=21.1% is obtained through calculation, and the actual VA content of EVAV5110J is 20%.

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Abstract

The invention discloses a method for extracting a pure ethylene-ethylene vinyl-acetate copolymer. The ethylene-ethylene vinyl-acetate copolymer is purified through utilizing the difference between two substances in mobility in a mixture of the ethylene-ethylene vinyl-acetate copolymer and paraffin in a solvent.

Description

technical field [0001] The invention relates to the field of hot melt adhesives, in particular to a method for rapidly extracting pure ethylene-vinyl acetate copolymer from a mixture containing ethylene-vinyl acetate copolymer and paraffin wax. Background technique [0002] Ethylene-vinyl acetate copolymer is a copolymer of ethylene and vinyl acetate. In the EVA hot melt adhesive system, VA content, melting point and melting index are important reference indicators. As an important viscosity modifier, paraffin wax is widely used in hot melt adhesive systems. The main component of paraffin wax is C20-C35 normal paraffins, containing a small amount of isoparaffins and naphthenes. [0003] Ethylene vinyl acetate copolymer and paraffin have little difference in solubility due to the similar main chain structure. [0004] Ethylene vinyl acetate copolymer is dispersed in a molecular state in organic solvents such as chloroform, and is a polymer solution. The phase separation of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F210/02C08F218/08
Inventor 魏守良贾梦虹吴杰吕丹
Owner 上海微谱检测科技集团股份有限公司
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