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A kind of preparation method of self-adhesive fresh-keeping PVDC composition

A composition and mixture technology, applied in the field of PVDC resin, can solve the problems of unfavorable industrial scale production, high economic cost, long polymerization time, etc., and achieve excellent transparency, high transparency, and good modification effect

Active Publication Date: 2021-04-27
ZHEJIANG QUZHOU JUSU CHEM IND CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has complicated process, long polymerization time and high economic cost, which is not conducive to industrial scale production.

Method used

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  • A kind of preparation method of self-adhesive fresh-keeping PVDC composition
  • A kind of preparation method of self-adhesive fresh-keeping PVDC composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A preparation method for self-adhesive fresh-keeping PVDC composition, comprising the following steps:

[0033](1) Put 55kg of deionized water, 4g of disodium edetate, 22g of methylcellulose, 22g of Hydroxypropyl methylcellulose, 25g sodium pyrophosphate, 105g diisopropyl peroxydicarbonate, 28kg vinylidene chloride, and 7kg vinyl chloride were cold dispersed for 30 minutes, then heated up to 37°C at a stirring speed of 22.5rpm to start polymerization ;

[0034] (2) Gradually increase the temperature to 55.5°C at a heating rate of 1.5°C / h, and simultaneously increase the stirring speed to 30rpm at a stirring rate of 1.3rpm / h, stop polymerization after 36 hours of reaction, discharge, heat up, and vacuum out residual monomer;

[0035] (3) Add epoxy soybean oil (ESO) 700g to the material after removing residual monomer, then centrifuge and dry;

[0036] (4) Add 1.75 kg of tributyl citrate (TBC) to the dried material, mix at 58° C. for 1 hour at a constant temperature, a...

Embodiment 2

[0038] A preparation method for self-adhesive fresh-keeping PVDC composition, comprising the following steps:

[0039] (1) Put 55kg of deionized water, 4g of disodium edetate, 22g of methylcellulose, 22g of Hydroxypropyl methylcellulose, 25g sodium pyrophosphate, 105g diisopropyl peroxydicarbonate, 29.75kg vinylidene chloride, 5.25kg vinyl chloride were cold dispersed for 30 minutes, then heated up to 36°C at a stirring speed of 20rpm. polymerization;

[0040] (2) Gradually increase the temperature to 55.5°C with a heating rate of 1°C / h, and simultaneously increase the stirring speed to 32rpm at a stirring rate of 1.3rpm / h, stop polymerization after 34 hours of reaction, discharge, heat up, and vacuum out residual monomer;

[0041] (3) Add epoxy soybean oil (ESO) 700g to the material after removing residual monomer, then centrifuge and dry;

[0042] (4) Add 1.75 kg of tributyl citrate (TBC) to the dried material, mix at 58° C. for 1.5 hours at a constant temperature, and ma...

Embodiment 3

[0044] A preparation method for self-adhesive fresh-keeping PVDC composition, comprising the following steps:

[0045] (1) Put 55kg of deionized water, 4g of disodium edetate, 22g of methylcellulose, 22g of Hydroxypropyl methylcellulose, 25g sodium pyrophosphate, 105g diisopropyl peroxydicarbonate, 28.7kg vinylidene chloride, 6.3kg vinyl chloride were cold dispersed for 30 minutes, then heated up to 36°C at a stirring speed of 25rpm. polymerization;

[0046] (2) Gradually increase the temperature to 53°C at a heating rate of 0.3°C / h, and simultaneously increase the stirring speed to 29rpm at a stirring rate of 0.6rpm / h, stop polymerization after 38 hours of reaction, discharge, heat up, and vacuum out residual monomer;

[0047] (3) Add epoxy soybean oil (ESO) 700g to the material after removing residual monomer, then centrifuge and dry;

[0048] (4) Add 1.25 kg of acetyl tributyl citrate to the dried material, mix at 58° C. for 1.5 hours at a constant temperature, and matur...

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Abstract

The invention discloses a preparation method of a self-adhesive fresh-keeping PVDC composition, which comprises deionized water, vinylidene chloride monomer, vinyl chloride monomer, chelating agent, buffering agent, dispersing agent and initiator in parts by weight. Put it into the polymerization tank, and start to polymerize after 30 minutes of cold dispersion; after the polymerization starts, stir at a speed of 0.6rpm / h~1.3rpm / h and 0.3℃ / h~1.5℃ / h and heat up to 53℃-57℃, 29rpm- After the rotation speed of 32rpm, stop the polymerization after 34h-38h of reaction, discharge the material, remove the residual monomer in vacuum; add plasticizer Ⅰ to the material after removing the residual monomer, centrifuge and dry; add plasticizer to the dried material II, mixing at constant temperature, discharging and packaging for aging, that is, obtaining the PVDC composition for self-adhesive plastic wrap. The invention has the advantages of simple process and excellent product processing performance. The film produced by the screw extruder has good transparency, barrier properties and self-adhesive properties, and is suitable for food fresh-keeping packaging.

Description

technical field [0001] The invention relates to PVDC resin, more specifically, the invention relates to a preparation method of a self-adhesive fresh-keeping PVDC composition. Background technique [0002] Food preservative films have moderate barrier properties (oxygen barrier, moisture barrier), adjust the oxygen and moisture content around the preserved products (cooked food, fruits and vegetables, etc.), and prolong the freshness period of food. Food preservation film is divided into polyethylene (PE), polyvinyl chloride (PVC), polyvinylidene chloride (PVDC) and other types according to the material. PE cling film is a kind of plastic packaging product commonly used by people to keep fresh food, and the use temperature does not exceed 110 ℃. PVC plastic wrap contains carcinogens, which are harmful to the human body. PVDC can be used in both refrigerators and microwave ovens, and is far superior to ordinary plastic wraps in terms of heat resistance and non-toxicity. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L27/08C08L91/00C08K5/11C08F214/08C08F214/06
CPCC08F214/08C08J5/18C08J2327/08C08K5/11C08K2201/014C08L27/08C08L2201/08C08L2201/10C08L2201/14C08L2203/16C08L91/00C08F214/06
Inventor 吴志刚余云飞韩金铭林久明何坚华苏兰辉吕颖琦翁晟宇黄晓军吴宇鹏余卫兵席圆圆胡金红
Owner ZHEJIANG QUZHOU JUSU CHEM IND CO LTD