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A kind of alcoholysis method of ethylene-vinyl acetate copolymer

A vinyl acetate and copolymer technology, which is applied in the field of normal pressure alcoholysis of ethylene-vinyl acetate copolymer for preparing EVOH, can solve the problems of lower system temperature, low alcoholysis efficiency, yellow color of the product, etc., and achieves simple separation and recovery. , the effect of saving reaction time and improving alcoholysis efficiency

Active Publication Date: 2017-05-24
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are some problems in this method, such as the low efficiency of alcoholysis, which generally takes a long time; the rapid cooling of the alcoholylysis solution by nitrogen gas is easy to cause blockage, and in order to maintain the concentration of alcoholysis, additional solvents are needed, and cold solvents and The addition of cold nitrogen will reduce the temperature of the system and cause fluctuations in local reactions; the resulting product has a yellowish hue and other problems

Method used

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  • A kind of alcoholysis method of ethylene-vinyl acetate copolymer

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Effect test

Embodiment 1

[0027] A kind of alcoholysis method of ethylene-vinyl acetate copolymer, comprises the following steps:

[0028] 1. Purification and preparation of polymers

[0029] The ethylene-vinyl acetate copolymer was replaced with n-butanol at a temperature of 70°C, so that the VAC content was 3wt% and the water content was 0.3wt%;

[0030] 2. Preparation of catalyst solution

[0031] Potassium amide was added as a catalyst to a butanol solvent to prepare a 3wt% catalyst alcohol solution, stirred to fully dissolve, and the heat was removed in time;

[0032] 3. Alcoholysis reaction

[0033] Mix 100 parts by weight of ethylene-vinyl acetate copolymer solution and 50 parts by weight of catalyst solution, the concentration of ethylene-vinyl acetate copolymer is 5wt%, stir evenly under the rotating speed of 150rpm, and then feed 0.1MPa under the condition of heat preservation N-butanol steam, the introduction of steam does not change the alcoholysis concentration, so that the solvent take...

Embodiment 2

[0036] A kind of alcoholysis method of ethylene-vinyl acetate copolymer, comprises the following steps:

[0037] 1. Purification and preparation of polymers

[0038] The ethylene-vinyl acetate copolymer was replaced with tert-butanol at a temperature of 75°C, so that the VAC content was 2wt% and the water content was 0.2wt%;

[0039] 2. Preparation of catalyst solution

[0040] Lithium diisopropylamide was added as a catalyst to a mixture of methanol and ethanol (1:1 mass ratio) to prepare a 10wt% catalyst alcohol solution, and stirred to fully dissolve it. The dissolution process is an exothermic process, and the heat should be removed in time;

[0041] 3. Alcoholysis reaction

[0042] Mix 100 parts by weight of ethylene-vinyl acetate copolymer solution and 30 parts by weight of catalyst solution, the concentration of ethylene-vinyl acetate copolymer is 50wt%, stir evenly under the rotating speed of 200rpm, and then feed 2.5MPa under the condition of heat preservation The ...

Embodiment 3

[0045] A kind of alcoholysis method of ethylene-vinyl acetate copolymer, comprises the following steps:

[0046] 1. Purification and preparation of polymers

[0047] The ethylene-vinyl acetate copolymer was replaced with propanol at a temperature of 72°C, so that the VAC content was 0.15wt% and the water content was 0.1wt%;

[0048] 2. Preparation of catalyst solution

[0049] Sodium tert-butoxide was added as a catalyst to a butanol solvent to prepare a 5wt% catalyst alcohol solution, stirred to fully dissolve, and the heat was removed in time;

[0050] 3. Alcoholysis reaction

[0051] Mix 100 parts by weight of ethylene-vinyl acetate copolymer solution and 20 parts by weight of catalyst solution, the concentration of ethylene-vinyl acetate copolymer is 10wt%, stir evenly under the rotating speed of 160rpm, and then feed 0.2MPa under the condition of heat preservation Propanol steam, the introduction of steam does not change the alcoholysis concentration, so that the solve...

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Abstract

The invention provides a simple and feasible normal pressure alcoholysis method of an ethylene-vinyl acetate copolymer. The introduction of solvent steam to carry out an alcoholysis reaction improves the alcoholysis degree, and EVOH with the alcoholysis degree of above 99% is obtained after the alcoholysis of the ethylene-vinyl acetate copolymer within 1-3h, so the alcoholysis efficiency is improved; and the prepared EVOH has good quality and white color.

Description

Technical field [0001] The present invention relates to an alcoholysis method of ethylene-vinyl acetate copolymer, and in particular to an atmospheric pressure alcoholysis method of ethylene-vinyl acetate copolymer for preparing EVOH. Background technique [0002] Ethylene-vinyl alcohol copolymer (EVOH), especially ethylene-vinyl alcohol copolymer with ethylene content of 20-50% (mol%), has excellent gas barrier properties, coupled with its transparency, processability, and solvent resistance and antistatic properties, making it widely used in packaging materials, automobile fuel tanks, oxygen-blocking floor heating pipes, textile materials, medical materials and other fields. EVOH is obtained by polymerizing ethylene and vinyl acetate under a certain pressure to obtain a copolymer, and then alcoholyzing the polymer. Among them, alcoholysis has a great influence on the quality of the final product. [0003] [0004] After the reaction proceeds for a period of time, it r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F210/02C08F218/08C08F8/00
Inventor 窦玉芹陈日清何灵芝王春鹏郭海奇金铁铃雷德松吴永忠胡腊梅黎园廖永康朱代才吴晓黎
Owner CHINA PETROCHEMICAL CORP