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Polyethylene-based structure

A polyethylene and structure technology, applied in the field of polyethylene-based structures, can solve problems such as being difficult to deal with and being scattered into the atmosphere, and achieve the effect of excellent barrier performance

Inactive Publication Date: 2015-08-26
MITSUBISHI GAS CHEM CO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Most of the above applications use high-density polyethylene (hereinafter sometimes referred to as "HDPE"). Although it has excellent mechanical strength, molding processability, and economical efficiency, it has the disadvantage that the items stored in the container are easily scattered into the atmosphere through the HDPE wall.
In recent years, gasoline permeation restrictions on resin gasoline tanks and their peripheral parts have become stricter year by year from the viewpoint of environmental pollution. Therefore, it is difficult to deal with it when using containers made of HDPE, and there is a strong demand for technology to improve gasoline barrier properties.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0129] Use a single-layer direct blow container molding device equipped with a 50mm single-screw extruder, connector, cylindrical die with parison controller, mold, clamping machine, cooler, etc., and put the following into the extruder hopper HDPE-1 / AD-1 / PA-1=80 / 10 / 10 (mass%) The ratio of dry blended mixed pellets, the extruder barrel temperature is set to 210 ~ 235 ° C, the connector temperature Set to 235°C, set the die head temperature to 230°C, set the screw speed to 30rpm to extrude the parison, and mold it into a can with a threaded plug with an inner volume of 450ml and an average wall thickness of 3mm by direct blow molding.

[0130] The obtained cans were subjected to a simulated gasoline permeability measurement and a drop test. The results are shown in Table 1. In addition, the SEM image of the side wall section of the tank is shown in figure 1 (observation magnification 5000 times). In the figure, the polyamide (C) containing m-xylylene group is cut diagonally...

Embodiment 2～10

[0132] As shown in Table 1, the types and compounding amounts of polyethylene (A), acid-modified polyethylene (B), and m-xylylene-containing polyamide (C) were changed in the same manner as in Example 1. Formed into jars with threaded plugs.

[0133] The obtained cans were subjected to a simulated gasoline permeability measurement and a drop test. The results are shown in Table 1.

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Abstract

This polyethylene-based structure is formed of a resin composition which contains 60-90% by mass of a polyethylene (A), 5-35% by mass of an acid-modified polyethylene (B) and 5-35% by mass of a meta-xylylene group-containing polyamide (C). This polyethylene-based structure is characterized in that: the meta-xylylene group-containing polyamide (C) is dispersed in the form of layers in the resin composition that constitutes the structure; and the acid-modified polyethylene (B) has an acid value of 5-30 mg / g.

Description

technical field [0001] The present invention relates to a polyethylene-based structure excellent in barrier properties and strength. Background technique [0002] Examples of containers for storing hydrocarbons and various chemicals or tubes for transferring hydrocarbons and various chemicals include chemical bottles, fuel tanks for automobiles or small engines, fuel pipes, and the like. Most of the metals and glass that have been used as raw materials in the past are being replaced by plastics. Compared with metal and glass, plastic has advantages such as light weight, no need for anti-rust treatment, less cracks, and high degree of freedom in shape. [0003] Most of the above applications utilize high-density polyethylene (hereinafter sometimes referred to as "HDPE"). Although it has excellent mechanical strength, molding processability and economical efficiency, it has the disadvantage that the items stored in the container are easily scattered into the atmosphere throug...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/00C08L23/06
CPCC08L23/06C08L2205/03Y10T428/1397C08L23/26C08L77/06B65D1/40
Inventor 石井健太郎加藤智则河野宪治小林弘
Owner MITSUBISHI GAS CHEM CO INC