CN111674136B - Protective mask and preparation method thereof - Google Patents

Protective mask and preparation method thereof Download PDF

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Publication number
CN111674136B
CN111674136B CN202010667710.5A CN202010667710A CN111674136B CN 111674136 B CN111674136 B CN 111674136B CN 202010667710 A CN202010667710 A CN 202010667710A CN 111674136 B CN111674136 B CN 111674136B
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China
Prior art keywords
porous membrane
protective mask
membrane material
material layer
layer
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CN202010667710.5A
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Chinese (zh)
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CN111674136A (en
Inventor
董卫国
关昊辰
吕明迪
宋钇汝
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Shandong Zhongheng Jingxin Carbon Fiber Science & Technology Development Co ltd
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Shandong Zhongheng Jingxin Carbon Fiber Science & Technology Development Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B32B27/322—Layered products comprising a layer of synthetic resin comprising polyolefins comprising halogenated polyolefins, e.g. PTFE
    • A—HUMAN NECESSITIES
    • A41—WEARING APPAREL
    • A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
    • A41D13/00—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches
    • A41D13/05—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches protecting only a particular body part
    • A41D13/11—Protective face masks, e.g. for surgical use, or for use in foul atmospheres
    • A—HUMAN NECESSITIES
    • A41—WEARING APPAREL
    • A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
    • A41D31/00—Materials specially adapted for outerwear
    • A41D31/02—Layered materials
    • A—HUMAN NECESSITIES
    • A41—WEARING APPAREL
    • A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
    • A41D31/00—Materials specially adapted for outerwear
    • A41D31/04—Materials specially adapted for outerwear characterised by special function or use
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/54—Particle separators, e.g. dust precipitators, using ultra-fine filter sheets or diaphragms
    • B01D46/543—Particle separators, e.g. dust precipitators, using ultra-fine filter sheets or diaphragms using membranes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/0004—Cutting, tearing or severing, e.g. bursting; Cutter details
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/06—Embossing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/022—Non-woven fabric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
    • B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B32B2262/0253—Polyolefin fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B32B2262/0261—Polyamide fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B32B2262/0276—Polyester fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2571/00—Protective equipment
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/30—Against vector-borne diseases, e.g. mosquito-borne, fly-borne, tick-borne or waterborne diseases whose impact is exacerbated by climate change

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Respiratory Apparatuses And Protective Means (AREA)

Abstract

The invention belongs to the technical field of protective articles, and particularly relates to a protective mask and a preparation method thereof. The invention provides a novel earrope, which comprises a main body and an earrope sleeve, wherein the main body comprises a fabric layer, a first porous membrane material layer, a two-component fabric layer, a second porous membrane material layer and a non-woven layer which are sequentially laminated from outside to inside; a hot-melt fiber net is arranged between the fabric layer and the first porous membrane material layer; the first porous membrane material layer and the second porous membrane material layer are independently polytetrafluoroethylene porous membranes or melt-blown nonwovens; at least one of the first porous membrane material layer and the second porous membrane material layer is a polytetrafluoroethylene porous membrane. The first porous membrane material layer and the second porous membrane material layer form a double-layer porous membrane structure, which is beneficial to the realization of the liquid and mist repellency of the protective mask, and is beneficial to ensuring that the structure of the protective mask layer is not changed when the protective mask is cleaned, and the protective mask is not filtered through electrostatic action and can be washed.

Description

Protective mask and preparation method thereof
Technical Field
The invention belongs to the technical field of protective articles, and particularly relates to a protective mask and a preparation method thereof.
Background
As an important protective article, protective masks are getting more and more attention. The protective mask has high filtering efficiency and low air suction resistance, so the protective mask has good protective effect and wearing feeling, but when the filtering efficiency is improved, the air suction resistance is often increased, and the protective mask is difficult to be completely improved.
The melt-blown nonwoven fabric is a fiber aggregate with ultrafine fibers automatically consolidated, has larger specific surface area of fibers, strong adsorption capacity to particles, and random distribution of fibers, forms a large number of complex three-dimensional micro-pores, has high filtration efficiency and low air suction resistance due to high micro-pore content, and is widely applied to main materials of protective masks. For example, the surface of the melt-blown polypropylene electret filter material subjected to electrostatic treatment is provided with electrostatic charge, and fine particles can be adsorbed by electrostatic attraction, so that the filtration efficiency is remarkably improved under the precondition of not increasing the suction resistance. However, the high efficiency of the melt-blown polypropylene electret filter material during air filtration depends greatly on the charge carried by the filter material, when the melt-blown polypropylene electret filter material is exposed to special environments, moisture, polar solvents, oily smoke and the like can reduce the electrostatic effect of the material, particularly when a mask containing the filter material is cleaned and soaked for sterilization, the electrostatic effect of the filter material can be reduced, the structure of a melt-blown fiber net in the protective mask can be damaged, and the filtration efficiency of the protective mask is greatly reduced. Research shows that after pure alcohol is soaked in melt-blown polypropylene electret filter material, the filter efficiency of the filter material is reduced from 99.58% to 77.42%, and the filter efficiency of the protective mask is greatly reduced.
In order to ensure the filtering efficiency of the protective mask and realize the aim that the protective mask can be washed, the Chinese special use of the publication numbers CN105901803A, CN106174791A, CN108354243A and CN108851288A protects filter paper and activated carbon cloth by using waterproof breathable films, and prevents the filter paper, the activated carbon cloth and water from contacting, but the technical scheme can increase the air suction resistance of the protective mask. At present, no washable protective mask with high filtering efficiency under the condition of not increasing inhalation resistance is reported.
Disclosure of Invention
Therefore, the invention aims to provide a protective mask which has the characteristics of high filtering efficiency, low air suction resistance, high efficiency, liquid and mist repellency and washability.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a protective mask, which comprises a main body and an ear rope sleeve, wherein the main body comprises a fabric layer, a first porous membrane material layer, a two-component fabric layer, a second porous membrane material layer and a non-woven fabric layer which are sequentially laminated from outside to inside; a hot-melt fiber net is arranged between the fabric layer and the first porous membrane material layer;
the first porous membrane material layer and the second porous membrane material layer are independently polytetrafluoroethylene porous membranes or melt-blown nonwovens; at least one of the first porous membrane material layer and the second porous membrane material layer is a polytetrafluoroethylene porous membrane.
Preferably, the porosities of the first porous membrane material layer and the second porous membrane material layer are independently equal to or more than 80%, and the average pore diameter is independently 3-5 μm.
Preferably, the filtration efficiency of the first porous membrane material layer and the second porous membrane material layer is independently 50-80%, and the air suction resistance is independently less than or equal to 60Pa.
Preferably, the fabric layer is a nonwoven fabric or a woven fabric.
Preferably, the air permeability of the fabric layer is more than or equal to 500mm/s.
Preferably, the bicomponent fabric layer comprises first fibers and second fibers;
the first fibers are low-melting-point fibers; the melting point of the low-melting-point fiber is 130-160 ℃;
the second fibers are high-melting-point fibers or non-melting fibers; the melting point of the high-melting-point fiber is higher than that of the low-melting-point fiber, and the difference of the melting points is more than or equal to 30 ℃;
the mass of the first fiber accounts for 30-50% of the total mass of the first fiber and the second fiber.
Preferably, the gram weight of the two-component fabric layer is 30-45 g/m 2 。
Preferably, the nonwoven layer is a meltblown nonwoven or a spunbond nonwoven.
Preferably, the air permeability of the nonwoven layer is more than or equal to 500mm/s.
The invention also provides a preparation method of the protective mask, which comprises the following steps:
laminating the materials according to the lamination sequence, and then carrying out hot rolling to obtain a protective mask main body composite layer;
cutting the composite layer of the protective mask body according to the size of the protective mask body to obtain the protective mask body;
connecting the protective mask main body with an ear rope sleeve to obtain the protective mask;
the temperature of the hot rolling is 150 ℃ and the pressure is 250N/cm 2 The method comprises the steps of carrying out a first treatment on the surface of the The line speed of the hot rolling was 6m/min.
The invention provides a novel earrope, which comprises a main body and an earrope sleeve, wherein the main body comprises a fabric layer, a first porous membrane material layer, a two-component fabric layer, a second porous membrane material layer and a non-woven layer which are sequentially laminated from outside to inside; a hot-melt fiber net is arranged between the fabric layer and the first porous membrane material layer; the first porous membrane material layer and the second porous membrane material layer are independently polytetrafluoroethylene porous membranes or melt-blown nonwovens; at least one of the first porous membrane material layer and the second porous membrane material layer is a polytetrafluoroethylene porous membrane. In the invention, the fabric layer provides higher strength and higher initial modulus, and can intercept larger particles through inertial collision effect as the reinforcing layer of the protective mask; in order to pursue high filtration efficiency, the traditional single-layer porous membrane reduces the pore diameter, reduces the porosity and improves the air suction resistance under the condition of obtaining small pore diameter, and the first porous membrane material layer and the second porous membrane material layer provided by the invention form a double-layer porous membrane structure; the two-component fabric layer and the non-woven layer cooperate with other interlayer structures, so that the filtering performance of the protective mask is further improved under the condition of smaller air suction resistance; the hot-melt fiber net realizes good adhesion of the fabric layer and the first porous membrane material layer, avoids the use of protective mask adhesives, prevents the increase of the suction resistance of the protective mask caused by the existence of adhesives, and is safer and more environment-friendly. The traditional melt-blown cloth protective mask is filtered by an electrostatic principle, and the electrostatic effect disappears after washing, so that the mask cannot be washed; the protective mask provided by the invention is different from the traditional melt-blown cloth protective mask, and meets the filtering requirement through micropores, so that the protective mask is not affected by water washing, and has good filtering performance and lower air suction resistance after water washing.
The test result of the embodiment shows that under the condition of 85L/min detection flow, the filtering efficiency of NaCl particles is 97.1-98.2%, and the suction resistance is 135-175 Pa; the filtering efficiency of the oil particles is 98.1-98.7%, and the suction resistance is 160-170 Pa.
Drawings
Fig. 1 is a schematic exploded view of a protective mask body according to the present invention, wherein 1 is a fabric layer, 2 is a first porous membrane material layer, 3 is a two-component fabric layer, 4 is a second porous membrane material layer, and 5 is a nonwoven layer.
Detailed Description
The invention provides a protective mask, which comprises a main body and an ear rope sleeve, wherein the main body comprises a fabric layer, a first porous membrane material layer, a two-component fabric layer, a second porous membrane material layer and a non-woven fabric layer which are sequentially laminated from outside to inside; a hot-melt fiber net is arranged between the fabric layer and the first porous membrane material layer;
the first porous membrane material layer and the second porous membrane material layer are independently polytetrafluoroethylene porous membranes or melt-blown nonwovens; at least one of the first porous membrane material layer and the second porous membrane material layer is a polytetrafluoroethylene porous membrane.
In the present invention, each of the substances is commercially available as known to those skilled in the art unless otherwise specified.
The structure of the protective mask body provided by the present invention will be described with reference to fig. 1, in which 1 is a fabric layer, 2 is a first porous membrane material layer, 3 is a two-component fabric layer, 4 is a second porous membrane material layer, and 5 is a nonwoven layer.
The body of the protective mask provided by the invention comprises a fabric layer. In the present invention, the fabric layer is preferably a nonwoven fabric or a woven fabric. In the present invention, when the fabric layer is a woven fabric, the number of warp yarns and weft yarns of the woven fabric is preferably 28 to 36.1tex, more preferably 30 to 36.1tex; the warp density of the woven fabric is preferably 190 to 200 pieces/10 cm, more preferably 190 to 195 pieces/10 cm, and the weft density is preferably 160 to 180 pieces/10 cm, more preferably 160 to 170 pieces/10 cm. In the present invention, when the fabric layer is a nonwoven fabric, the gram weight of the nonwoven fabric is preferably 80 to 100g/m 2 More preferably 85 to 95g/m 2 . In the present invention, the fabric layer is preferably a single-component material or a two-component material. When the fabric layer is made of single-component materials, the fabric layer is preferably made of terylene. When the fabric layer is a two-component material, the fabric layer preferably comprises a first component and a second component; the first component is preferably a low melting point fiber; the melting point of the low-melting-point fiber is preferably 130-160 ℃, more preferably 130-150 ℃; the second component is preferably a high melting point fiber or a non-melting fiber; the melting point of the high-melting-point fiber is higher than that of the low-melting-point fiber, and the difference of the melting points is more than or equal to 30 ℃; the mass of the first component is preferably 30 to 50% of the total mass of the first component and the second component, more preferably 30 to 40%. In one embodiment of the invention, the fabric layer is a bicomponent spunbond nonwoven comprised of polyethylene terephthalate (PET) fibers and polypropylene (PP) fibersCloth; the melting point of the polyethylene terephthalate fiber is 230 ℃; the melting point of the polypropylene fiber is 130 ℃; the mass ratio of the polyethylene terephthalate fiber to the polypropylene fiber is 7:3, a step of; the gram weight of the bicomponent spunbonded nonwoven is 100g/m 2 . In the present invention, the air permeability of the fabric layer is preferably not less than 500mm/s.
The body of the protective mask provided by the invention comprises a first porous membrane material layer. In the present invention, the first porous membrane material layer is preferably a polytetrafluoroethylene porous membrane or a melt-blown nonwoven fabric. In the present invention, the porosity of the first porous membrane material layer is preferably 80% or more, and the average pore diameter is preferably 3 to 5 μm, more preferably 3.5 to 4.5 μm. In the present invention, the filtration efficiency of the first porous membrane material is preferably 50 to 80%, more preferably 55 to 75%; the suction resistance is preferably less than or equal to 60Pa. When the first porous film material layer is a melt-blown nonwoven fabric, the gram weight of the melt-blown nonwoven fabric is preferably 30 to 50g/m 2 More preferably 30 to 40g/m 2 。
In the present invention, a hot melt fiber web is disposed between the fabric layer and the first porous membrane material layer. In the present invention, when the fabric layer is made of a single component material, the melting point of the hot-melt fiber web is preferably the same as the melting point of the material of the fabric layer; when the fabric layer is made of a bicomponent material, the melting point of the hot-melt fiber web is preferably the same as the melting point of the low-melting fiber. In the present invention, the grammage of the hot-melt web is preferably 10 to 15g/cm 2 More preferably 10 to 13g/cm 2 . In the present invention, the material of the hot-melt fiber web is preferably polyamide.
The main body of the protective mask provided by the invention comprises a double-component fabric layer. In the present invention, the bicomponent fabric layer includes a first fiber and a second fiber. In the present invention, the first fibers are preferably low-melting fibers; the melting point of the low-melting fiber is preferably 130 to 160 ℃, more preferably 135 to 155 ℃. In the present invention, the second fibers are preferably high-melting fibers or non-melting fibers; the melting point of the high-melting-point fiber is higher than that of the low-melting-point fiber, and the difference of the melting points is preferably more than or equal to 30 ℃. In the present inventionThe mass of the first fibers is preferably 30 to 50% of the total mass of the first fibers and the second fibers, and more preferably 30 to 40%. In the present invention, the gram weight of the bicomponent fabric layer is preferably 30 to 45g/m 2 More preferably 35 to 45g/m 2 . In one embodiment of the present invention, the bicomponent fabric layer is a bicomponent web composed of polyethylene terephthalate (PET) fibers and polypropylene (PP) fibers; the melting point of the polyethylene terephthalate fiber is 230 ℃; the melting point of the polypropylene fiber is 130 ℃; the mass ratio of the polyethylene terephthalate fiber to the polypropylene fiber is 7:3.
the body of the protective mask provided by the invention comprises a second porous membrane material layer. In the present invention, the second porous membrane material layer is preferably a polytetrafluoroethylene porous membrane or a melt-blown nonwoven fabric. In the present invention, the porosity of the second porous membrane material layer is preferably 80% or more, and the average pore diameter is preferably 3 to 5. Mu.m, more preferably 3.5 to 4.5. Mu.m. In the present invention, the filtration efficiency of the second porous membrane material is preferably 50 to 80%, more preferably 55 to 75%; the resistance is preferably less than or equal to 60Pa. When the second porous film material layer is a meltblown nonwoven fabric, the meltblown nonwoven fabric preferably has a grammage of 30-50 g/m 2 More preferably 30 to 40g/m 2 。
In the invention, at least one of the first porous membrane material layer and the second porous membrane material layer is a polytetrafluoroethylene porous membrane.
The body of the protective mask provided by the invention comprises a non-woven layer. In the present invention, the air permeability of the nonwoven layer is preferably not less than 500mm/s. In the present invention, the nonwoven layer preferably has a grammage of 80 to 100g/m 2 More preferably 85 to 95g/m 2 . In the present invention, the nonwoven layer is preferably a meltblown nonwoven or a spunbond nonwoven. In the present invention, the nonwoven layer is preferably a bicomponent nonwoven, more preferably a bicomponent spunbond nonwoven; the bicomponent nonwoven fabric preferably comprises a component A and a component B; the part A is preferably a low melting point fiber; the melting point of the low-melting fiber is preferably 130 to 160 ℃, more preferably 130 to 150 DEG CThe method comprises the steps of carrying out a first treatment on the surface of the The component B is preferably high-melting-point fiber or non-melting fiber; the melting point of the high-melting-point fiber is higher than that of the low-melting-point fiber, and the difference of the melting points is more than or equal to 30 ℃; the mass of the component A is preferably 30 to 50% of the total mass of the component A and the component B, more preferably 30 to 40%. In one embodiment of the present invention, the nonwoven layer is a bicomponent spunbond nonwoven composed of polyethylene terephthalate fibers and polypropylene fibers; the melting point of the polyethylene terephthalate fiber is 230 ℃; the melting point of the polypropylene fiber is 130 ℃; the mass ratio of the polyethylene terephthalate fiber to the polypropylene fiber is 7:3, a step of; the gram weight of the bicomponent spunbonded nonwoven is 100g/m 2 。
In the invention, the material of the earrope sleeve is preferably pure cotton material.
The invention also provides a preparation method of the protective mask, which comprises the following steps:
laminating the materials according to the lamination sequence, and then carrying out hot rolling to obtain a protective mask main body composite layer;
cutting the composite layer of the protective mask body according to the size of the protective mask body to obtain the protective mask body;
and connecting the protective mask main body with an earrope sleeve to obtain the protective mask.
According to the invention, the composite layer of the protective mask main body is obtained by laminating the materials of each layer according to the lamination sequence and then hot-rolling.
In the present invention, the materials of the layers are the same as the structural materials of the layers of the protective mask main body in the above technical scheme, and will not be described herein.
In the invention, each layer of material is conveyed by a net conveying curtain after being laminated, is fed into a hot rolling system, and is heated and pressurized by an upper heating roller and a lower embossing roller of the hot rolling system to carry out hot rolling on the material which is laminated and placed (wherein the heating roller is contacted with the material of the fabric layer, and the embossing roller is contacted with the material of the non-woven fabric layer). In the present invention, the temperature of the hot rolling is preferably 150 to 160 ℃, more preferably 150 to 155 ℃; the pressure is preferably 250N/cm 2 . In the invention, the upper heating roller and the upper heating roller are used for hot rollingThe linear velocity of the lower engraved roller is preferably 6 to 8m/min, more preferably 6 to 7m/min.
After the protective mask main body composite layer is obtained, the protective mask main body composite layer is cut according to the size of the protective mask main body, so that the protective mask main body is obtained.
The size of the protective mask body is not particularly limited in the present invention, as is known in the art or as required by the customer. The cutting process is not particularly limited, and the cutting process well known to those skilled in the art can be adopted.
After the protective mask main body is obtained, the protective mask main body is connected with the earrope sleeve to obtain the protective mask.
The mode of connecting the protective mask body and the ear loops is not particularly limited, and the protective mask body and the ear loops may be connected in a manner well known to those skilled in the art, such as a head-wearing type, an ear-wearing type or a neck-wearing type. The process for connecting the protective mask body and the ear loops is not particularly limited, and a connecting process well known to those skilled in the art, such as hot pressing, may be adopted.
In order to further illustrate the present invention, the following examples are provided to describe in detail a protective mask and a method for producing the same, but they should not be construed to limit the scope of the present invention. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
Sequentially stacking a fabric layer, a hot-melt fiber net, a first porous membrane material layer, a two-component fabric layer, a second porous membrane material layer and a non-woven layer from outside to inside, wherein the fabric layer adopts polyester filament fabrics, warp yarns and weft yarns are 36.1tex, the warp density is 190 pieces/10 cm, and the weft density is 160 pieces/10 cm; the first porous membrane material layer is a polytetrafluoroethylene porous membrane, the average pore diameter is 3.9 mu m, and the porosity is 86%; hot meltThe fiber web was a polyamide fiber web having a melting point of 130℃and a grammage of 10g/cm 2 The method comprises the steps of carrying out a first treatment on the surface of the The double-component fabric layer is a fiber net formed by mixing PET fiber with a melting point of 230 ℃ and PP fiber with a melting point of 130 ℃, wherein the mass ratio of PET to PP is 7:3, the gram weight of the two-component fabric layer is 45g/cm 2 The method comprises the steps of carrying out a first treatment on the surface of the The second porous membrane material layer is a polytetrafluoroethylene porous membrane, the average pore diameter is 3.9 mu m, and the porosity is 86%; the non-woven layer is a bicomponent spun-bonded non-woven fabric formed by mixing PET fiber with a melting point of 230 ℃ and PP fiber with a melting point of 130 ℃, and the gram weight is 100g/cm 2 ；
Conveying the layers of materials which are placed in a laminated way by a net conveying curtain, feeding the materials into a hot rolling system, and heating and pressurizing the materials by an upper heating roller and a lower embossing roller to carry out hot rolling, wherein the heating temperature is 150 ℃, and the pressure is 150N/cm 2 The linear speed of the heating roller and the embossing roller is 6m/min, and a protective mask main body composite layer is obtained; cutting the composite layer of the protective mask body according to the size of the protective mask body to obtain the protective mask body; and connecting the protective mask main body with an earrope sleeve to obtain the protective mask.
The filtration efficiency and the inhalation resistance of the obtained protective mask were tested according to GB 2626-2019 "respiratory protection self-priming filtration type particulate matter prevention respirator":
1. filtering NaCl particles, detecting flow rate to be 85L/min, measuring filtering efficiency to be 98.2%, and sucking resistance to be 135Pa, so as to meet the KN95 requirement;
2. the filtering of oil (DOP) particles, the measuring flow rate is 85L/min, the filtering efficiency is 98.7%, the suction resistance is 160Pa, and the requirements of KP95 are met.
Example 2
The method comprises the steps of sequentially stacking a fabric layer, a hot-melt fiber net, a first porous membrane material layer, a two-component fabric layer, a second porous membrane material layer and a non-woven layer from outside to inside, wherein the fabric layer adopts the two-component spun-bonded non-woven fabric and consists of PET fibers with the melting point of 230 ℃ and PP fibers with the melting point of 130 ℃, and the gram weight is 100g/cm 2 The method comprises the steps of carrying out a first treatment on the surface of the The first porous membrane material layer is a polytetrafluoroethylene porous membrane, the average pore diameter is 3.9 mu m, and the porosity is 86%; the hot-melt fiber web has a melting point of130℃polyamide fiber web with a grammage of 10g/cm 2 The method comprises the steps of carrying out a first treatment on the surface of the The double-component fabric layer is a fiber net formed by mixing PET fiber with a melting point of 230 ℃ and PP fiber with a melting point of 130 ℃, wherein the mass ratio of PET to PP is 7:3, the gram weight of the two-component fabric layer is 45g/cm 2 The method comprises the steps of carrying out a first treatment on the surface of the The second porous membrane material layer is a polytetrafluoroethylene porous membrane, the average pore diameter is 3.9 mu m, and the porosity is 86%; the non-woven layer is a bicomponent spun-bonded non-woven fabric formed by mixing PET fiber with a melting point of 230 ℃ and PP fiber with a melting point of 130 ℃, and the gram weight is 100g/cm 2 ；
Conveying the layers of materials which are placed in a laminated way by a net conveying curtain, feeding the materials into a hot rolling system, and heating and pressurizing the materials by an upper heating roller and a lower embossing roller to carry out hot rolling, wherein the heating temperature is 150 ℃, and the pressure is 150N/cm 2 The linear speed of the heating roller and the embossing roller is 6m/min, and a protective mask main body composite layer is obtained; cutting the composite layer of the protective mask body according to the size of the protective mask body to obtain the protective mask body; and connecting the protective mask main body with an earrope sleeve to obtain the protective mask.
The filtration efficiency and the inhalation resistance of the obtained protective mask were tested according to GB 2626-2019 "respiratory protection self-priming filtration type particulate matter prevention respirator":
1. filtering NaCl particles, detecting flow rate to be 85L/min, measuring filtering efficiency to be 97.2%, and sucking resistance to be 153Pa, so as to meet the KN95 requirement;
2. the filtering of oil (DOP) particles, the measuring flow rate is 85L/min, the filtering efficiency is 98.1%, the air suction resistance is 170Pa, and the requirements of KP95 are met.
Example 3
The method comprises the steps of sequentially stacking a fabric layer, a hot-melt fiber net, a first porous membrane material layer, a two-component fabric layer, a second porous membrane material layer and a non-woven layer from outside to inside, wherein the fabric layer adopts the two-component spun-bonded non-woven fabric and consists of PET fibers with the melting point of 230 ℃ and PP fibers with the melting point of 130 ℃, and the gram weight is 100g/cm 2 The method comprises the steps of carrying out a first treatment on the surface of the The first porous membrane material layer is a polytetrafluoroethylene porous membrane, the average pore diameter is 3.9 mu m, and the porosity is 86%; the hot-melt fiber web is polyamide fiber with a melting point of 130 DEG CWei net with gram weight of 10g/cm 2 The method comprises the steps of carrying out a first treatment on the surface of the The double-component fabric layer is a fiber net formed by mixing PET fiber with a melting point of 230 ℃ and PP fiber with a melting point of 130 ℃, wherein the mass ratio of PET to PP is 7:3, the gram weight of the two-component fabric layer is 45g/cm 2 The method comprises the steps of carrying out a first treatment on the surface of the The second porous film material layer is melt-blown non-woven fabric with gram weight of 30g/m 2 The filtration efficiency of the melt-blown nonwoven fabric was 81% and the air suction resistance was 55Pa; the non-woven layer is a bicomponent spun-bonded non-woven fabric formed by mixing PET fiber with a melting point of 230 ℃ and PP fiber with a melting point of 130 ℃, and the gram weight is 100g/cm 2 ；
Conveying the layers of materials which are placed in a laminated way by a net conveying curtain, feeding the materials into a hot rolling system, and heating and pressurizing the materials by an upper heating roller and a lower embossing roller to carry out hot rolling, wherein the heating temperature is 150 ℃, and the pressure is 150N/cm 2 The linear speed of the heating roller and the embossing roller is 6m/min, and a protective mask main body composite layer is obtained; cutting the composite layer of the protective mask body according to the size of the protective mask body to obtain the protective mask body; and connecting the protective mask main body with an earrope sleeve to obtain the protective mask.
The filtration efficiency and the inhalation resistance of the obtained protective mask were tested according to GB 2626-2019 "respiratory protection self-priming filtration type particulate matter prevention respirator":
the NaCl particles are filtered, the detection flow is 85L/min, the filtering efficiency is 97.1%, the air suction resistance is 175Pa, and the requirements of KN95 are met.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.

Claims (6)

1. The protective mask comprises a main body and an ear rope sleeve, and is characterized in that the main body is provided with a fabric layer, a first porous membrane material layer, a two-component fabric layer, a second porous membrane material layer and a non-woven fabric layer which are sequentially stacked from outside to inside; a hot-melt fiber net is arranged between the fabric layer and the first porous membrane material layer;
the first porous membrane material layer and the second porous membrane material layer are independently polytetrafluoroethylene porous membranes or melt-blown nonwovens; at least one of the first porous membrane material layer and the second porous membrane material layer is a polytetrafluoroethylene porous membrane;
the porosities of the first porous membrane material layer and the second porous membrane material layer are independently more than or equal to 80%, and the average pore diameter is independently 3-5 mu m;
the filtering efficiency of the first porous membrane material layer and the second porous membrane material layer is independently 50-80%, and the air suction resistance is independently less than or equal to 60Pa;
the air permeability of the outer fabric layer is more than or equal to 500mm/s;
the air permeability of the non-woven layer is more than or equal to 500mm/s;
under the condition of 85L/min detection flow, the filtering efficiency of NaCl particles is 97.1-98.2%, and the air suction resistance is 135-175 Pa; the filtering efficiency of the oil particles is 98.1-98.7%, and the air suction resistance is 160-170 Pa.
2. The protective mask of claim 1 wherein the outer fabric layer is a nonwoven or woven fabric.
3. The protective mask of claim 1 wherein the bicomponent fabric layer comprises first and second fibers;
the first fibers are low-melting-point fibers; the melting point of the low-melting-point fiber is 130-160 ℃;
the second fibers are high-melting-point fibers or non-melting fibers; the melting point of the high-melting-point fiber is higher than that of the low-melting-point fiber, and the difference of the melting points is more than or equal to 30 ℃;
the mass of the first fiber accounts for 30-50% of the total mass of the first fiber and the second fiber.
4. A protective mask according to claim 1 or 3, wherein the two-component fabric layer has a grammage of 30-45 g/m 2 。
5. The protective mask of claim 1 wherein the nonwoven layer is a meltblown nonwoven or a spunbond nonwoven.
6. The method for producing a protective mask according to any one of claims 1 to 5, comprising the steps of:
laminating the layers of materials according to the lamination sequence, and then carrying out hot rolling to obtain a protective mask main body material;
cutting the protective mask main body material according to the size of the protective mask main body to obtain the protective mask main body;
connecting the protective mask main body with an ear rope sleeve to obtain the protective mask;
the temperature of the hot rolling is 150 ℃ and the pressure is 250N/cm 2 The method comprises the steps of carrying out a first treatment on the surface of the The line speed of the hot rolling was 6m/min.
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CN112773019A (en) * 2021-01-29 2021-05-11 腾飞科技股份有限公司 Protective mask capable of being washed repeatedly and preparation process thereof
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CN1820831A (en) * 2005-02-19 2006-08-23 桐乡市健民过滤材料有限公司 Polytetrafluoroethylene composite micro porous film for air purifying and its producing method
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CN1334770A (en) * 1998-12-11 2002-02-06 大金工业株式会社 Porous material, air filter filter medium, air filter unit and support material for air filter filter medium
CN1820831A (en) * 2005-02-19 2006-08-23 桐乡市健民过滤材料有限公司 Polytetrafluoroethylene composite micro porous film for air purifying and its producing method
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