JPH10225526A - Dust protective mask - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mask which can prevent hindrance to respiration as possible as it can, and which can exhibit an effect of trapping fine pollen and can be usable for a long time. SOLUTION: A dust protective mask comprises a filter material composed of a net-like base material made of PET as polymer fibers, coated thereover with a coating material made of a copolymer of vinylideno fluoride as fluorine group resin, and discharge treated by a corona discharge. As a result, the filter member has a high degree of charged amount so as to enhance the dust collecting action, and may have a large mesh size.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a dust mask which efficiently and efficiently collects dust.

[0002]

2. Description of the Related Art Conventionally, wool or synthetic fiber has been used as a filter material in a conventional dust mask. However, since it is difficult to collect fine dust as it is, a phenol resin or a styrene resin is converted to an organic solvent. It is generally known that by melting and subjecting to resin processing, the collection efficiency can be increased by the electrostatic effect.

[0003] Regarding this electrostatic effect, for example,
According to JP-A-133680, a filter material in which polypropylene is resin-processed with vinyl acetate or the like as a base material is subjected to a tanning treatment by a physical means to greatly enhance an electrostatic effect, thereby improving dust collection efficiency. Is disclosed to be significantly improved.

[0004]

In recent years, the number of people with allergic rhinitis due to pollen has increased, and many people are particularly vulnerable to cedar pollen. A person with such a so-called hay fever is required to have a mask which can be used for a long period of time because it does not hinder breathing as much as possible and has an effect of collecting fine pollen.

Accordingly, the present invention provides a dust mask which is not obtained by the above-mentioned physical processing and has a remarkably excellent collection effect.

[0006]

DISCLOSURE OF THE INVENTION In view of the above, the present invention provides a net-like base made of a polymer fiber coated with a coating material made of a silicon-based resin or a fluorine-based resin to perform a charging treatment. Characterized in that a polymer fiber used for the base material is polyethylene, polypropylene, polyethylene terephthalate (PET), polyamide, polyacrylonitrile, or the like.
Polyvinyl chloride, polyvinyl alcohol, polyvinyl acetate, polyphenylene sulfide, nitrocellulose, Kevlar can be used alone or blended,
Acetic acid type, as a silicone resin,
One-component condensation type such as oxime type and alcohol type, two-component condensation type, one-component addition type (heat curing type),
Alternatively, monomers or copolymers such as ethylene tetrafluoride, ethylene trifluoride chloride, vinylidene fluoride, and vinyl fluoride can be used as the fluorine-based resin. Also,
As a coating method, a solution selected from coating materials is used as a solution by a general spraying method, a dipping method, a coating method, and the like. Further, the charging process may be a general method of arranging electrodes on the upper and lower surfaces of the filter material, but since the filter material is not a smooth surface, a sheet-like electrode or roll is arranged on one surface of the filter material to form an electrode, A needle-shaped electrode can be provided on the opposite side and charged by corona discharge. At this time, the temperature of the filter material is preferably close to the softening temperature, and the filter material is cooled to room temperature while applying a DC voltage.

As a result, the charge amount of the filter material is increased, the dust collecting action is increased, the eyes of the filter material can be formed rough, and a dust mask which does not hinder the breathing of the user can be obtained. .

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, in the embodiment of the present invention, the base material is PET (polyethylene terephthalate).
The case where a copolymer of vinylidene fluoride, which is a fluororesin, is used as the coating material will be described.

First, a copolymer of vinylidene fluoride is made into a solution (0.5 to 3% methyl ethyl ketone solution) using an organic solvent, and PET (40 to 60 mesh) of a split iron (honeycomb structure) as a base material is used. And then dried at 50-60 ° C. for 30 minutes to 1 hour.
Heat treatment (crystallization) is performed at 40 to 150 ° C. for 6 to 12 hours.

[0010] The filter material thus obtained is
Placed on a metal plate as an electrode in a thermostat at 0 ° C. (setting the temperature so that the filter material does not melt), and needle-shaped electrodes as counter electrodes (a plurality of needle electrodes are arranged at 3 mm intervals so that the tips are in a plane) Is arranged at 10 mm, and is subjected to a charging treatment (polarization) by corona discharge at an applied voltage of 6.6 KV (about 6 to 10 KV depending on the distance between the electrodes) for 1 minute (1 to 3 minutes when the coating material does not puncture). Then, it was cooled to room temperature in an applied state. For the production process, a metal plate is used as a roll,
A method of unwinding a sheet of filter material is preferred. Also,
The charging process may be performed while unwinding the sheet of the filter material, disposing electrodes above and below the sheet, and moving the sheet.

The surface potential of the charged filter material was measured by a rotating sector type surface voltmeter.
And a large charge amount could be given. Ragweed (hog Weed) was scattered as a powder sample on the table, and when this filter material was placed about 10 cm above, the ragweed was instantaneously pulled up to the filter material.

Regarding the ability of the filter material to retain the charging property, washing with a detergent was repeated three times, and the surface potential was measured each time. As a result, almost the same potential as that after the charging treatment was obtained, and the potential was partially reduced by about 5%.

[0013] This filter material is appropriately sized, for example, 6
By cutting into a square and wrapping it in gauze to form a dust-proof mask, dust such as pollen in the passing airflow can be almost absorbed by the filter material inside. And since the size of the filter material can be enlarged, it does not hinder the breathing of the user.

Similarly, as the polymer fiber used for the base material, polyethylene, polypropylene, polyamide, polyacrylonitrile, polyvinyl chloride, polyvinyl alcohol, polyvinyl acetate, polyphenylene sulfide, nitrocellulose, and Kevlar alone or blended. It is also possible to use. As the coating material, a one-component condensation type such as an acetic acid type, an oxime type, or an alcohol type, a two-component condensation type, a one-component addition type (heat-curable) silicone resin, or tetrafluoride ethylene,
A monomer or copolymer fluororesin such as ethylene trifluoride chloride or vinyl fluoride can be used. Further, as a coating method, a coating material is used as a solution to carry out a general spraying method, a dipping method, a coating method or the like, and the resin is cured by drying the solvent to coat the base material with the resin.

As described above, in the above embodiment, a net-like base material made of a polymer fiber such as PET is coated with a coating material made of a fluororesin such as a copolymer of vinylidene fluoride, and a corona discharge is applied. A dust mask is formed by using the filter material subjected to the charging treatment. As a result, the charge amount of the filter material can be increased, the dust collecting action can be increased, and the mesh of the filter material can be formed coarsely. Therefore, a dust mask which does not hinder the user's breathing can be obtained.

Claims (1)

[Claims] 1. A net-like substrate made of a polymer fiber,
A dust mask comprising a filter material coated with a coating material made of a silicone resin or a fluorine resin and subjected to a charging treatment.