JPS6014771B2 - Method for manufacturing a molded body with excellent fluid barrier properties - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing an olefin resin molded body having excellent gas and liquid barrier properties.

Conventionally, olefin resins such as polyethylene and polypropylene have been widely used as general-purpose resins, but olefin resins have good gas and liquid permeability and are suitable for soy sauce, vinegar,
When stored or used for a long period of time as a container for gasoline, kerosene, etc., the contents have the disadvantage that the contents may dissipate or the contents may be oxidized due to displacement of gases inside and outside the container. Various methods have been proposed to overcome the above drawbacks, but
I haven't found anything satisfying yet.

For example, a method has been proposed in which an olefin resin and a resin with excellent barrier properties are laminated, but this method has drawbacks such as peeling between the two layers and the need for complicated manufacturing equipment. . A method of sulfonating or halogenating the surface of an olefin resin molded body has also been proposed, but this method is dangerous because it uses toxic gases such as S03 gas and halogen gas. An object of the present invention is to provide a safe and easy method for producing an olefin resin molded body having excellent mechanical strength and fluid barrier properties.

That is, the gist of the present invention resides in a method for producing a molded article having excellent fluid barrier properties, which is characterized by subjecting an olefin resin molded article to ultraviolet irradiation treatment in an atmosphere of a brominated fluorohydrocarbon compound.

The olefin resin molded body used in the present invention is a molded body such as a film, sheet, bag, box, etc. made of olefin resin. Examples of the olefin resin include:
Polyethylene, polypropylene, polybutene, ethylene-propylene copolymer, chlorinated polyethylene, chlorinated polypropylene, ethylene-vinyl acetate copolymer, ethylene-vinyl chloride copolymer, ethylene-acrylic ester copolymer, ethylene-acrylic copolymer Examples include polymers.

The brominated fluorinated hydrocarbon compounds used in the present invention are brominated and fluorinated hydrocarbon compounds, such as monobromo trifluoromethane, dibromodifluoromethane, monobromodifluoromethane, 1,2-dibromo Examples include tetrafluoroethane.

In the present invention, the olefin resin molded body is subjected to ultraviolet irradiation treatment in an atmosphere of the brominated fluorohydrocarbon compound, but any known method may be adopted for the ultraviolet irradiation treatment, such as a low-pressure mercury lamp. The molded body may be supplied to an irradiation device equipped with a lamp such as an ultra-high pressure mercury lamp, and the irradiation treatment may be performed by setting the inside of the irradiation device to an atmosphere of the compound.

Also, the processing time is not particularly limited, but is 5 minutes to 3 minutes.
It is preferable that the treatment be carried out within the range of

When subjected to ultraviolet irradiation treatment as described above, the surface of the molded product is easily fluorinated. The structure of the present invention is as described above, and since an olefin resin molded body is subjected to ultraviolet irradiation treatment in an atmosphere of a brominated fluorohydrocarbon compound, a molded body with a fluorinated surface can be produced safely and easily. The molded product obtained has excellent barrier properties against gases such as oxygen, nitrogen, carbon dioxide, hydrogen, and helium, as well as organic solvents such as alcohol, ketone esters, and ethers, and liquids such as gasoline and kerosene. Excellent water repellency and formability.

Therefore, the molded bodies obtained by the present invention can be used as gas barrier packaging films, containers for foods, cosmetics, detergents, medicines, etc., storage tanks for gasoline, kerosene, etc., pipes, cups, etc.
Suitable for use in cases, release paper, etc.

Next, the present invention will be explained by examples.

Examples 1 and 2, Comparative Example 1 Press-molded high-density polyethylene with a thickness of 100 mm (
The sheet (density 0.956) was supplied to an ultraviolet irradiation device equipped with a low-pressure mercury lamp, and the brominated fluorohydrocarbon compounds shown in Table 1 were introduced and irradiated for 20 minutes.

In addition, the permeation number of n-bentane and benzene vapor and the permeation number of gasoline at 4000 were measured for the plasma-treated polyethylene sheet according to the pressure method of the Product Chemistry Research Institute, and the results are shown in Table 1. For comparison, the permeation numbers of n-pentane and benzene vapor and the permeation number of gasoline of the polyethylene sheets used in the examples were measured in the same manner and are shown in Table 1.

Table 1

Claims (1)

[Claims] 1. A method for producing a molded body with excellent fluid barrier properties, which comprises subjecting an olefin resin molded body to ultraviolet irradiation treatment in an atmosphere of a brominated, fluorinated hydrocarbon compound.