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A kind of high moisture resistance polyester plastic and polyester plastic container

A polyester plastic and copolymer technology, applied in the field of plastic rigid packaging, can solve the problems of poor hydrophilicity and hygroscopicity, poor moisture barrier properties, low gas permeability, decreased gas barrier properties, etc. Improved barrier properties and low cost

Active Publication Date: 2020-03-20
FOSHAN SOUTHERN PACKAGING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The structure of polyethylene naphthalate (PEN) is similar to that of PET, and the compatibility of the two is good, but the price is expensive
Polyvinylidene chloride (PVDC) is highly barrier to both oxygen and water vapor, but applications are limited due to its chlorine content
Polyvinyl alcohol (PVOH) has the lowest gas permeability, but due to the presence of hydrophilic hydroxyl groups in the molecular structure, it has poor moisture resistance and is difficult to process
Ethylene-vinyl alcohol copolymer (EVOH) combines the good processability of polyethylene and the high gas barrier properties of polyvinyl alcohol, but its hydrophilicity and hygroscopicity make it poor in moisture barrier properties, and the gas barrier properties will increase with humidity while falling
In order to prevent this situation, only a multi-layer structure can be used, and the EVOH is wrapped in the middle with a moisture-resistant resin, and the process is complicated

Method used

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  • A kind of high moisture resistance polyester plastic and polyester plastic container
  • A kind of high moisture resistance polyester plastic and polyester plastic container
  • A kind of high moisture resistance polyester plastic and polyester plastic container

Examples

Experimental program
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preparation example Construction

[0042] ②Preparation of high moisture resistance polyester plastic and polyester plastic bottle:

[0043] S1. First mix maleic anhydride grafted polyolefin and silane coupling agent uniformly at room temperature; then graft with polyethylene terephthalate, fatty acid ester modified ethylene-vinyl alcohol copolymer, Branched polyolefin, silane coupling agent, and filler are put into a high-speed mixer and stirred evenly;

[0044]S2. Feed the mixture in S1 into a twin-screw extruder for melting and plasticization, set the temperature of the extruder to 280-300° C., and the screw speed to 100-500 rpm, and extrude to obtain pellets of polyester plastic;

[0045] S3. Injection molding, stretching and blow molding the pellets prepared in S2 to prepare a hollow polyester plastic bottle.

[0046] The maleic anhydride-grafted polyethylene used in the examples and comparative examples of the present invention is American Dow GR202, and the maleic anhydride-grafted polypropylene is Frenc...

Embodiment 1～4 and comparative example 1～3

[0048] The raw material addition amount of fatty acid ester modified ethylene-vinyl alcohol copolymer in Examples 1-4 and Comparative Examples 1-2 is as shown in Table 1;

[0049] The raw material add-on of the polyester plastic of embodiment 1~4 and comparative example 1~3 and polyester plastic bottle is as shown in table 2;

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Abstract

The invention discloses polyester plastic with a high moisture barrier property. The polyester plastic is prepared from substances in percentage by weight as follows: 70%-90% of polyethylene terephthalate, 8%-20% of a fatty acid ester modified ethylene-vinyl alcohol copolymer, 1%-5% of maleic anhydride grafted polyolefin, 0.5%-2% of a silane coupling agent and 0-10% of filler, wherein the fatty acid ester modified ethylene-vinyl alcohol copolymer is prepared from fatty acyl chloride and an ethylene-vinyl alcohol copolymer in the weight ratio being (0.5-0.8):1. The invention also discloses a polyester plastic container with the high moisture barrier property. The fatty acid ester modified ethylene-vinyl alcohol copolymer and polyethylene terephthalate are blended, the barrier property of the polyester plastic to vapor is effectively improved, the flexibility of the polyester plastic is improved, and the polyester plastic container with the high moisture barrier property is obtained finally. The prepared polyester plastic container with the high moisture barrier property has good uniformity and barrier property and is simple to operate and low in cost.

Description

technical field [0001] The invention relates to the field of hard plastic packaging, in particular to a polyester plastic with high moisture resistance and a polyester plastic container. Background technique [0002] Polyethylene terephthalate (PET) bottles have the characteristics of small specific gravity, convenient transportation, high strength, unbreakable, high transparency, no harmful gas when burned, and easy recycling and reuse. , daily chemical products and pharmaceutical packaging, has been more and more widely used. Through rapid cooling of PET, it is convenient to obtain PET products that are basically in an amorphous state, highly transparent, and easy to stretch. PET hollow containers, especially stretch blow-molded bottles, give full play to the performance of PET and have a good display effect on the contents. , performance and cost to compete with other hollow containers. [0003] Although the gas barrier property of PET is much higher than that of polyet...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/02C08L29/04C08L51/06C08K5/544C08K5/5435C08K3/26C08K3/34C08F8/14
CPCC08F8/14C08K2003/265C08K2201/011C08L67/02C08L2201/14C08L2203/10C08L2312/08C08L29/04C08L51/06C08K5/5435C08K3/26C08K3/34C08K5/544C08F216/06
Inventor 蔡军杰张桂祥刘长来岑锐鸿
Owner FOSHAN SOUTHERN PACKAGING