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Copolymer composition containing ethylene and vinyl alcohol structure unit, and preparation method thereof

A technology of unit copolymers and structural units, which is applied in the field of copolymer compositions containing ethylene and vinyl alcohol structural units to improve thermal stability and its preparation, and can solve problems affecting product quality, yellowing or degradation of finished products, etc.

Inactive Publication Date: 2016-06-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The processing temperature of copolymers containing ethylene and vinyl alcohol structural units is 170-240°C. Under high temperature conditions, the finished product may turn yellow or degrade and affect product quality.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0059] The preparation method of ethylene-vinyl acetate copolymer:

[0060] Under stirring at 55-60° C. and 4.6 MPa, 4.4 g of azobisisobutyronitrile was used to initiate copolymerization of vinyl acetate (4.4 L) in methanol (0.6 L) for 5 h. Remove unreacted ethylene and vinyl acetate monomers to obtain ethylene-vinyl acetate copolymer / methanol solution.

[0061] Ethylene-vinyl acetate copolymers with different ethylene content or copolymerization composition can be prepared by changing the process conditions such as ratio, temperature, and pressure. After removing the solvent, the ethylene-vinyl acetate copolymer product can be obtained.

[0062] The preparation method of ethylene-vinyl acetate-allyl acetate terpolymer is the same as that of ethylene-vinyl acetate copolymer, except that a small amount of allyl acetate comonomer is introduced into the polymerization system.

[0063] The molecular weight and molecular weight distribution of ethylene-vinyl acetate copolymer wer...

Embodiment 1

[0069] (1) Preparation of copolymer solution containing ethylene and vinyl alcohol structural units

[0070] 1g of ethylene-vinyl acetate copolymer (abbreviated as EVA, ethylene content: 37mol%, number average molecular weight (Mn): 46000) was dissolved in methanol, the mass concentration of the copolymer was 25%, and the equivalent of VA unit in EVA was added 4mol% sodium hydroxide / alcohol solution, react at 65°C for 3 hours to form a copolymer / methanol solution containing ethylene and vinyl alcohol structural units (abbreviation: component A / methanol solution), wherein the ethylene content in component A is 37.0 mol%, the vinyl acetate structure content is 0.6 mol%, and the vinyl alcohol structure content is 62.4 mol%.

[0071] (2) Preparation of solution containing ethylene and vinyl alcohol structural unit copolymer composition

[0072] At 60°C, form a mixed solution of boric acid (component B1), phosphoric acid (component B2), 2,6-di-tert-butyl-4-methylphenol (component ...

Embodiment 2

[0078] (1) The preparation method of the copolymer alcohol solution containing ethylene and vinyl alcohol structural units is the same as in Example 1.

[0079] (2) Preparation of solution containing ethylene and vinyl alcohol structural unit copolymer composition

[0080] At 25°C, add boric acid (component B1) with a concentration of 1.33g / L and phosphoric acid (component B2) with a concentration of 1.73g / L in methanol to the ethylene and vinyl alcohol structural unit prepared in step (1). In the copolymer alcohol solution, mix for 45 minutes, then add 2,6-di-tert-butyl-4-methylphenol (component C) methanol solution with a concentration of 4g / L to the above mixture and stir for 10 minutes to form ethylene-containing and vinyl alcohol structural unit copolymer composition solution, wherein the mass ratio of boric acid, phosphoric acid, 2,6-di-tert-butyl-4-methylphenol to component A is 1:6.2:0.5:100, the prepared The solution viscosity of the composition was 430 mPa·s.

[00...

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Abstract

The present invention discloses a copolymer composition containing an ethylene and vinyl alcohol structure unit, and a preparation method thereof. The composition comprises components A, B, C and D, wherein the component A is a copolymer containing an ethylene and vinyl alcohol structure unit, the component B is an acid, the component C is a phenol or amine organic compound, the component D is an alkali metal or an alkaline earth metal salt, and by adopting the mass of the component A as 100%, the mass contents of the components B and D are 0.1-4.0%, and the mass content of the component C is 0.01-1.8%. The preparation method specifically comprises: (1) preparation of the solution of a copolymer containing an ethylene and vinyl alcohol structure unit; (2) preparation of the solution of a copolymer composition containing an ethylene and vinyl alcohol structure unit; and (3) sold molding of the copolymer composition containing the ethylene and vinyl alcohol structure unit. According to the present invention, the composition has characteristics of uniform component dispersion, high thermal stability, and product quality improving.

Description

technical field [0001] The invention relates to a copolymer composition containing ethylene and vinyl alcohol structural units and a preparation method thereof, in particular to a copolymer composition containing ethylene and vinyl alcohol structural units with improved thermal stability and a preparation method thereof. Background technique [0002] The copolymer containing ethylene and vinyl alcohol structural units is a polymer material that integrates the excellent processability of ethylene polymers and the excellent gas barrier properties of vinyl alcohol polymers. This polymer material has the characteristics of excellent gas barrier properties, mechanical strength, stretchability, abrasion resistance, antistatic properties, solvent resistance, processability and transparency. It is widely used in packaging materials, textile materials, medical materials and other fields. See "Plastic Industry", 2011, Issue 39, pages 1-4. For example, in the food industry for asepti...

Claims

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Application Information

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IPC IPC(8): C08L29/04C08F218/08C08F210/02C08F8/12C08K3/38C08K3/32C08K5/13C08K5/092
Inventor 吴一弦马良兴张树于晓东薛晓贤陈青葵孙国臣陈贵轩钱鑫刘冰波
Owner CHINA PETROLEUM & CHEM CORP
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