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Preparation method for polyester slices for heat shrinkable film

A production method and technology of polyester chips, applied in the production field of copolymerized modified polyester, can solve the problems of many side reactions, large difference in thermal shrinkage properties, slow esterification, etc., and achieve small differences and thermal shrinkage. Good, solve the effect of easy yellowing

Active Publication Date: 2018-04-10
ANHUI WANWEI UPDATED HIGH TECH MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such as patent CN102807669A discloses a kind of introduction of the second modified monomer dicarboxylic acid on the basis of neopentyl glycol monomer modified PET to improve the thermal shrinkage of neopentyl glycol single modified monomer, and by introducing Melt enhancer, which makes the copolyester molecules branched and partially crosslinked polyester viscosity and strength, but in the production process of the modified polyester, due to the high esterification temperature, there are many side reactions, which seriously affect the hue of the product
Patent CN104327256A discloses a production process of polyester chips for modified heat-shrinkable films, which adopts a three-pot process: esterification→precondensation→final polycondensation, and optimizes the processes of each point to produce slices with good heat shrinkability, high intrinsic viscosity, and hue Good, uniform quality, but in the actual production process, the esterification of neopentyl glycol is relatively slower than that of ethylene glycol, and it is difficult for neopentyl glycol to be completely blocked into the molecular chain, resulting in thermal shrinkage of products between batches The performance varies greatly, which is mainly due to the different content of neopentyl glycol contained in the products between batches. In addition, because most of the neopentyl glycol is released from the polycondensation tank during the polycondensation process, the follow-up processing costs are increased, and Not environmentally friendly

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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  • Preparation method for polyester slices for heat shrinkable film
  • Preparation method for polyester slices for heat shrinkable film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The present embodiment makes the polyester chips for heat-shrinkable film according to the following steps:

[0029] 1. Step by step beating process

[0030] High-temperature beating kettle: put 814kg of neopentyl glycol into the high-temperature beating kettle, slowly raise the temperature to 110°C, keep the temperature for 30 minutes, click to start the stirring motor, and slowly put in 1100kg of terephthalic acid, 3kg of p-toluenesulfonic acid, and 2kg of sodium acetate Stir well to combine.

[0031] Normal temperature beating kettle: Put 1720kg of ethylene glycol into the normal temperature beating kettle, start the stirring motor, slowly add 3650kg of terephthalic acid and 250kg of isophthalic acid, and fully stir evenly.

[0032] Step 2. Low-temperature step-by-step esterification

[0033] The first step of esterification: the material treated in the high-temperature beating tank is slowly and uniformly sent into the first esterification tank through a gear pump...

Embodiment 2

[0038] The manufacturing process of the polyester chip of this embodiment is identical with embodiment 1, and difference only is that step 1 is carried out as follows:

[0039] Put 1,720kg of ethylene glycol and 814kg of neopentyl glycol into the beating kettle and stir thoroughly, then slowly add 4,750kg of terephthalic acid, 250kg of isophthalic acid, 3kg of p-toluenesulfonic acid, and 2kg of sodium acetate. beating.

Embodiment 3

[0041] The manufacturing process of the polyester chips in this example is the same as that in Example 1, the only difference being that no compounding auxiliary agent is added.

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Abstract

The invention discloses a preparation method for polyester slices for a heat shrinkable film; with terephthalic acid, modified diol, ethylene glycol and modified dibasic acid as main materials, underthe action of compound auxiliary agents, the polyester slices are obtained by step-by-step beating, low temperature step-by-step esterification, condensation polymerization and grain-sized dicing. Themodified copolyester produced by the method has the advantages of excellent hue, good heat shrinkage, short melting range and small difference between product batches.

Description

technical field [0001] The invention discloses a method for making a special polyester chip for heat-shrinkable films, and belongs to the field of copolymerized modified polyester production. Background technique [0002] Heat shrinkable film is widely used in the packaging industry of beverages and daily necessities, etc., and it is mainly made of PVC and PS. PVC heat-shrinkable film has the characteristics of high transparency, good gloss, and high shrinkage rate. However, since beverage bottles are mostly made of PET, the PVC label needs to be removed during regeneration. The process is cumbersome, and there is a problem of available chlorine, which directly affects environmental protection. PS heat-shrinkable label film also has a cumbersome regeneration process. At present, polyester products (PETG) modified by 1,4-cyclohexanedimethanol (PETG) are very suitable for the preparation of heat shrinkable films, but because of its raw and auxiliary materials 1,4-cyclohexaned...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/672C08K5/42C08K5/098
CPCC08G63/672C08K5/098C08K5/42
Inventor 许宏平高峰徐冬生金善强欧阳勇军丁明沈瑞王胜龙张传文杨芳
Owner ANHUI WANWEI UPDATED HIGH TECH MATERIAL CO LTD
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