Heat shrink film of reclaimed material and preparation method of heat shrink film

A heat-shrinkable film and recycled material technology, applied in chemical instruments and methods, layered products, synthetic resin layered products, etc., can solve the problems of uneven film thickness, uneven shrinkage, uneven color, etc., and achieve good thickness The effects of uniformity, wide range of shrinkage, and good tensile strength

Pending Publication Date: 2022-01-21
SHANDONG SHENGHE PLASTIC DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Uneven color, some transparent and blue polyester plastic containers are recycled and processed. Because the quantity of blue polyester plastic containers is difficult to control, the general fluctuation range is 15%-25%, so this kind of The color of recycled materials fluctuates greatly
Therefore, when recycled materials are directly used for recycling in the film industry, there will be problems such as yellowing or large color fluctuations.
[0008] (3) The modification component content is insufficient, because the raw material of polyester plastic container adopts the copolyester material of the isophthalic acid copolymerization modified polyethylene terephthalate that accounts for about 5mol% of total diacid more, The molar content of modified components of recycled materials is generally between 0.5mol% and 5mol%, which is far from enough for polyester heat shrinkable films with high recovery or high shrinkage
Under the existing technology, directly using recycled materials to process polyester heat shrinkable film has uneven film thickness, insufficient mechanical strength, uneven shrinkage rate, yellowish color or large color fluctuation, and cannot achieve high recovery or high shrinkage rate. and other issues, so there is no application research report

Method used

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  • Heat shrink film of reclaimed material and preparation method of heat shrink film
  • Heat shrink film of reclaimed material and preparation method of heat shrink film
  • Heat shrink film of reclaimed material and preparation method of heat shrink film

Examples

Experimental program
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Effect test

Embodiment 1

[0043] A heat-shrinkable film of regenerated materials, containing 25% by mass fraction of recycled polyester raw materials and 75% by mass fraction of virgin polyester raw materials, wherein the regenerated polyester raw materials are modified by copolymerization of isophthalic acid A copolyester material of polyethylene terephthalate, wherein the isophthalic acid component accounts for 2.5mol% of the total diacid component of the recycled polyester raw material; the raw polyester raw material is copolymerized modified polyethylene terephthalate A copolyester material of ethylene glycol diformate, wherein the dibasic acid in the modified component accounts for 20mol% of the total diacid component of the raw polyester raw material, and the dibasic alcohol in the modified component accounts for 20mol% of the raw polyester 27 mol% of the total diol content of the raw material.

[0044] The modified components of virgin polyester raw materials are diethylene glycol and neopentyl ...

Embodiment 2

[0058] A heat-shrinkable film of recycled materials, containing 45% by mass fraction of recycled polyester raw materials and 55% by mass fraction of virgin polyester raw materials, wherein the recycled polyester raw materials are modified by copolymerization of isophthalic acid A copolyester material of polyethylene terephthalate, wherein the isophthalic acid component accounts for 0.8mol% of the total diacid component of the recycled polyester raw material; the raw polyester raw material is copolymerized modified polyethylene terephthalate A copolyester material of ethylene glycol diformate, wherein the dibasic acid in the modified component accounts for 20mol% of the total diacid component of the raw polyester raw material, and the dibasic alcohol in the modified component accounts for 20mol% of the raw polyester 27 mol% of the total diol content of the raw material.

[0059] The modified components of virgin polyester raw materials are isophthalic acid, diethylene glycol an...

Embodiment 3

[0065] A heat-shrinkable film of regenerated materials, containing 60% by mass fraction of regenerated polyester raw materials and 40% by mass fraction of virgin polyester raw materials, wherein the regenerated polyester raw materials are modified by copolymerization of isophthalic acid A copolyester material of polyethylene terephthalate, wherein the isophthalic acid component accounts for 0.8mol% of the total diacid component of the recycled polyester raw material; the raw polyester raw material is copolymerized modified polyethylene terephthalate A copolyester material of ethylene glycol diformate, wherein the modified component includes one or more of dibasic acid or dibasic alcohol, and the dibasic acid in the modified component accounts for the total of the raw polyester raw material 20mol% of the diacid component, and the dihydric alcohol in the modified component accounts for 27mol% of the total diol component of the virgin polyester raw material.

[0066] The modified...

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Abstract

The invention belongs to the technical field of heat shrink films, and particularly relates to a heat shrink film of a reclaimed material and a preparation method of the heat shrink film. A reclaimed polyester raw material and a native polyester raw material are used as mixed raw materials, and the reclaimed polyester raw material is a polyethylene glycol terephthalate copolyester material copolymerized and modified by isophthalic acid; the native polyester raw material is a copolyester material of copolymerized and modified polyethylene glycol terephthalate, and the modified component comprises one or more of binary acid or dihydric alcohol. The prepared heat shrink film has the characteristics of high recovery amount, good thickness uniformity, good mechanical strength, good shrink rate uniformity, normal color, small color fluctuation, wide shrinkrange and the like.

Description

technical field [0001] The invention belongs to the technical field of heat-shrinkable films, and in particular relates to a heat-shrinkable film made of recycled materials and a preparation method thereof. Background technique [0002] Polyester heat shrinkable film (referred to as "PETG heat shrinkable film") is a new type of heat shrinkable packaging material, and the market demand has grown rapidly in recent years. Because of its high shrinkage rate, good transparency, non-toxic, tasteless, good mechanical properties, excellent printing performance, and low self-shrinkage rate, relatively durable storage, especially in line with environmental protection, etc., PET heat in developed countries Shrink film has successfully replaced polyvinyl chloride (PVC) heat shrinkable film and has become the most ideal shrink packaging material. [0003] Polyester plastic containers, including bottles, cups, boxes, etc., are a type of plastic containers that are widely used. Because i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/36B32B27/06C08L67/02C08J5/18B29C48/18B29C55/12
CPCB32B27/36B32B27/08C08J5/18B29C48/18B29C55/12C08J2367/02C08J2467/02B32B2307/54B32B2307/4026Y02P70/10
Inventor 李彬冯益强贺海峰
Owner SHANDONG SHENGHE PLASTIC DEV
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