JP-2022077933-A - FILTER AND MASK

Abstract

To provide a filter and a mask having a high collection rate of a virus and a low pressure loss.SOLUTION: A filter comprises: outer surface part base materials 2 and 2 which are formed on both outer surfaces of the filter and are made of a foam or a nonwoven fabric; and two intermediate part base materials 3 which are arranged between both the outer surface part base materials 2 and 2, are made of a nonwoven fabric or a foam, and have air-permeability. The outer surface part base material and the intermediate part base material have a nanofiber-impregnated layer 4 obtained by allowing a nanofiber 5 to permeate to the inside from an inner side surface 2a of the outer surface part base material 2 and both surfaces of the intermediate part base material 3. The nanofiber-impregnated layer 4 is formed by an electrospinning method in each of the base materials.SELECTED DRAWING: Figure 3

Inventors

• UMEHARA NOBUHIRO

Assignees

• AIR&D CO LTD

Dates

Publication Date

20220524

Application Date

20201112

Priority Date

20201112

Claims (5)

1. An outer surface base material formed on the outer surface on both sides and made of a foam or a non-woven fabric, It comprises one or more intermediate substrates, which are disposed between the outer surface substrates on both sides and are made of a non-woven fabric or foam and have breathability. A filter characterized in that nanofibers permeate inward on both the inner surface of each outer surface substrate and both surfaces of the intermediate substrate.
2. The filter according to claim 1, wherein the nanofibers are formed on each of the base materials by an electrostatic spinning method.
3. The filter according to claim 2, wherein the nanofibers are formed from a polyurethane resin emulsion containing polyvinyl alcohol by an electrostatic spinning method.
4. The filter according to claim 2 or 3, wherein the nanofibers are formed by an electrostatic spinning method in a state where the outer surface portion base material and the intermediate portion base material are stretched in a plane direction. ..
5. A mask characterized by being formed by using the filter according to any one of claims 1 to 4.

Description

The present invention relates to a filter for removing a virus and a mask using the same. Some of the filters used for masks for preventing virus infection are formed of nanofibers having a very small fiber diameter because the virus is very small particles. Regarding such filters and masks, Patent Document 1, The technique described in 2 is disclosed. Patent Document 1 describes a mask comprising a microfiber nonwoven fabric or woven fabric layer containing an inorganic porous material and a nanofiber nonwoven fabric layer laminated on the nonwoven fabric or woven fabric layer. Patent Document 2 describes a face protector composed of a composite fabric of a nanofiber non-woven fabric layer and at least one layer of fabric. Japanese Unexamined Patent Publication No. 2008-18882Japanese Unexamined Patent Publication No. 2014-24561 It is sectional drawing which shows typically the filter of embodiment of this invention, (a) shows the state before laminating, (b) shows the state after laminating.It is a micrograph by observing the cross section of the nanofiber formed on the outer surface part substrate of FIG.It is sectional drawing which shows typically the filter of another embodiment of this invention, (a) shows the state before laminating, (b) shows the state after laminating. Hereinafter, the filter according to the embodiment of the present invention will be described with reference to the drawings. In the following embodiments, the vertical direction of FIGS. 1 and 3 will be described as the vertical positional relationship. In FIG. 1, the filter 1 is a sheet-like middle portion arranged between the outer surface base materials 2 and 2 formed on the outer surface portions on both the upper and lower sides of FIG. 1 and the outer surface portion base materials 2 and 2. The nanofibers 5 permeate inward on both inner surfaces 2a and the intermediate base material 3 of the outer surface base materials 2 and 2 on both sides, and the nanofibers penetrate into this portion. The nanofiber impregnated layer 4 impregnated with 5 is formed. That is, in the filter 1, the outer surface base material 2 is formed on the outer surface portions on both the upper and lower sides, the intermediate portion base material 3 is arranged between the outer surface portion base materials 2 and 2, and the nanofiber impregnated layer 4 is provided. A total of four layers are formed on both inner surfaces 2a of the outer surface portion base material 2 on both sides and both sides of the intermediate portion base material 3, and a total of seven layers including the nanofiber impregnated layer 4 are formed as a whole. Hereinafter, each layer will be described. The outer surface base material 2 is composed of open cell foam, and the raw material synthetic resin is polyurethane, polystyrene, polyethylene, polypropylene, and in addition, phenol resin, polyvinyl chloride, urea resin, silicone, polyimide, etc. Examples include melamine resin. Of these, polyurethane foam is desirable. The open cell polyurethane foam is breathable, flexible, elastic and resilient, and has adhesiveness. The open-cell polyurethane foam has a thickness of about 0.5 to 5.0 mm, and when the filter 1 is used as a mask, it feels good on the skin of the face. The outer surface base material 2 is not limited to these foams such as urethane foams, and other materials such as non-woven fabric may be used as long as they have good breathability and feel good on the skin of the face. .. Next, the intermediate base material 3 is made of a non-woven fabric. As the non-woven fabric, melt blown non-woven fabric made of long fibers, spunbonded non-woven fabric, thermal bonded non-woven fabric made of short fibers, chemical bonded non-woven fabric, spunlaced non-woven fabric, wet non-woven fabric and the like can be used. The material of the melt blown nonwoven fabric or the spunbonded nonwoven fabric may be any of polyurethane (PU), polypropylene (PP), polybutylene terephthalate (PBT), and polyethylene (PE), but may be polyurethane (PU). desirable. As the material of the thermal bond non-woven fabric, polyester, polyolefin or the like is used. Chemical bonded non-woven fabrics, spunlaced non-woven fabrics, and wet non-woven fabrics are composed of one or several kinds of polyester, rayon, polyvinyl alcohol, polyolefin containing polypropylene, cotton or pulp. In addition, other material such as a foam may be used for the intermediate part base material 3. The average fiber diameter of the fibers constituting the non-woven fabric is preferably selected from the range of 1 to 30 μm. Further, it is desirable that the basis weight of the nonwoven fabric is 5.0 to 120 g / m 2 and the thickness is in the range of 0.25 to 1.0 mm. Further, it is desirable that the nonwoven fabric has high rigidity and has an elongation of 200% or more. Next, the nanofiber impregnated layer 4 refers to a portion in which the nanofibers 5 permeate inward from the surface of each base material and im