WO2022160402A1

WO2022160402A1 - Protective mask which can be washed repeatedly

Info

Publication number: WO2022160402A1
Application number: PCT/CN2021/078077
Authority: WO
Inventors: 叶刚; 梅先明
Original assignee: 腾飞科技股份有限公司
Priority date: 2021-01-29
Filing date: 2021-02-26
Publication date: 2022-08-04
Also published as: CN216674787U

Abstract

A protective mask which can be washed repeatedly. The protective mask comprises a mask body, and ear loops fixedly arranged on two opposite sides of the mask body. The mask body comprises a surface layer (1), an inner layer (2) and a middle layer (3) arranged between the two. The middle layer (3) comprises a first middle layer (31), a second middle layer (32) and a third middle layer (33) which are sequentially stacked and are subjected to ultrasonic laminating, wherein the first middle layer (31) and the third middle layer (33) are both polypropylene spunbonded non-woven fabric layers, and the second middle layer (32) is a polypropylene melt-blown fabric layer that has been subjected to a spunlace electret treatment. The polypropylene melt-blown fabric layer is formed by processing a polypropylene melt-blown material containing 6-7 wt.% of an electret masterbatch, and the electret masterbatch comprises an inorganic electret powder, an organic electret powder, a compatilizer, a processing aid and a polypropylene resin. The PFE of the protective mask is greater than or equal to 99%, and the BEF thereof is also greater than or equal to 99%; the number of washing times thereof can be up to 20; and the filtration efficiency of the protective mask after washing can remain greater than or equal to 95% in terms of PFE, and greater than or equal to 95% in terms of BEF.

Description

Re-washable protective masks

technical field

The utility model relates to a protective mask, in particular to a protective mask that can be washed repeatedly, belonging to the technical field of personal respiratory protection appliances.

Background technique

A mask is a kind of hygiene product, which generally refers to a device worn on the mouth and nose to filter the air entering the mouth and nose, so as to prevent harmful gases, odors, and droplets from entering and leaving the wearer's mouth and nose. It is extremely important in the medical and health field. It plays an important role in the epidemic prevention project of preventing and blocking respiratory infectious diseases. Most of the protective masks in the prior art use the principle of physical interception and filtration, that is, use a certain pore size filter material to filter and intercept fine dust and particles larger than the pore size, thereby preventing bacteria and viruses attached to them from contacting the human body and entering the respiratory tract. , thereby greatly reducing the risk of infection or harm to the human body.

At present, the mask body of common protective masks on the market is mostly divided into inner, middle and outer layers, and the middle layer is mostly made of ultra-fine polypropylene fiber meltblown material layer, but this kind of protective mask cannot be washed with water, and it can be used for 3-4 hours It needs to be replaced, and the replacement frequency is too fast, which causes a lot of waste for ordinary individual users. Therefore, it is necessary to provide a protective mask that can be repeatedly washed with water, and at the same time, the protective mask still has an excellent filtering effect after being washed with water.

Utility model content

In order to solve the various technical problems raised in the above-mentioned background technology, the present invention provides a protective mask that can be washed repeatedly. efficiency.

The technical scheme of the present utility model is:

A protective mask that can be washed repeatedly, comprising a mask body and ear straps fixed on opposite sides of the mask body, wherein the mask body includes a surface layer, an inner layer, and is arranged on the surface layer and the inner layer. The intermediate layer between the two layers, the intermediate layer includes a first intermediate layer, a second intermediate layer and a third intermediate layer which are sequentially stacked and welded together by ultrasonic composite welding, wherein

The first intermediate layer and the third intermediate layer are both polypropylene spunbond non-woven layers;

The second intermediate layer is a spunlace electret-treated polypropylene melt-blown cloth layer, and the polypropylene melt-blown cloth layer is made of polypropylene melt-blown material including 6-7wt. Polypropylene melt-blown cloth layer formed after extrusion, jet stretching and web-forming reinforcement.

Its further technical solutions are:

The polypropylene spunbond nonwoven fabric layer used in the first intermediate layer and the third intermediate layer is a single-layer double S spunbond nonwoven fabric layer with a gram weight of 25-30 g/cm ² .

Its further technical solutions are:

The polypropylene melt-blown cloth layer used in the second intermediate layer is a single-layer polypropylene melt-blown cloth layer with a gram weight of 40-45 g/cm ² .

Its further technical solutions are:

The fiber diameter in the polypropylene meltblown cloth layer is 0.5-0.8 microns.

Its further technical solutions are:

Inorganic electret powder particles and organic electret powder particles are dispersed in the fibers of the polypropylene melt-blown cloth layer.

Its further technical solutions are:

The particle diameter D90 of the inorganic electret powder particles is 50-100 nm, and the average particle diameter of the organic electret powder particles is 50-200 nm.

Its further technical solutions are:

Both the surface layer and the inner layer are cloth layers made of nylon fibers, and the grammage of the cloth layers is 100-130 g/cm ² .

Its further technical solutions are:

The surface layer and the inner layer are respectively attached to both sides of the middle layer through a polyurethane adhesive layer.

The beneficial technical effects of the present utility model are:

1. The middle layer of the mask of the present invention adopts a layer of polypropylene melt-blown cloth to be sandwiched between two layers of polypropylene spunbond nonwoven fabrics, and the three layers are compounded together by means of ultrasonic welding; The polypropylene spunbond non-woven fabric layer has the functions of stretching and water repellency, and the polypropylene meltblown cloth in the middle has the effect of filtering particles and carrying germs and virus droplets. The setting of the three-layer structure can make the center meltblown The washing resistance of the cloth is greatly increased; at the same time, the ultrasonic bonding and compounding method adopted can resist the impact of repeated washing, and can also greatly increase the washing resistance of the mask;

2. Inorganic electret powder particles and organic electret powder particles with specific particle sizes are dispersed in the fibers of the polypropylene melt-blown cloth layer of the present utility model, and the polypropylene melt particles with the above-mentioned specific particle size electret powder particles are dispersed. The electret produced by the spray layer is greatly increased after the spunlace electret, and can be rubbed to generate static electricity during the washing process after use, so as to ensure that the mask still has a high filtering effect after washing;

3. The polypropylene melt-blown cloth layer of the mask of the present invention adopts the spunlace electret instead of the conventional electric electret to generate more electrets, thereby making up for the electrodes lost in the spunlace electret process, which can make While ensuring the electrostatic saturation of the treated melt-blown cloth and greatly improving the filtration efficiency, it can also make the non-woven fabric have better permeability, stable electret, long retention time, strong adsorption, low resistance, and after use The filtration efficiency after washing with water is less reduced;

4. The mask of the present invention has PFE≥99% and BEF≥99%, the number of washings can be as high as 20 times, and the filtration efficiency of the mask after washing can still reach PFE≥95% and BEF≥95%.

Description of drawings

Fig. 1 is the sectional structure schematic diagram of the mask body of the present utility model;

Fig. 2 is the physical plan view of the intermediate layer described in the utility model;

in:

1, surface layer; 2, inner layer; 3, middle layer; 31, first middle layer; 32, second middle layer; 33, third middle layer.

Detailed ways

In order to have a clearer understanding of the technical means of the present invention and to implement it in accordance with the contents of the description, the specific embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention. , but is not intended to limit the scope of the present invention.

This specific embodiment describes in detail a protective mask that can be washed repeatedly. The protective mask includes a mask body and ear straps fixed on opposite sides of the mask body, wherein the ear straps are arranged in a conventional technical solution in the art , which will not be repeated in this specific embodiment.

The mask body comprises a surface layer 1, an inner layer 2 and an intermediate layer 3 arranged between the surface layer and the inner layer, wherein the surface layer 1 and the inner layer 2 are respectively attached to both sides of the intermediate layer 3 through the polyurethane adhesive layer. , the specific bonding method and the adopted polyurethane adhesive layer are all conventional technical solutions in the art, which will not be repeated in this specific embodiment.

The above-mentioned surface layer 1 is the side away from the human face after the wearer puts on the mask, and the inner layer 2 is the side facing the human face after the wearer puts on the mask. The surface layer 1 and the inner layer 2 are made of the same material, both are fabric layers made of nylon fibers, and the gram weight of the fabric layer is 100-130 g/cm ² .

The above-mentioned intermediate layer 3 includes a first intermediate layer 31, a second intermediate layer 32 and a third intermediate layer 33 that are laminated and composited in sequence, and the first intermediate layer 31, the second intermediate layer 32 and the third intermediate layer 33 are laminated and arranged. Then, the intermediate layer 3 is formed by ultrasonic composite welding.

The first intermediate layer 31 and the third intermediate layer 33 in the intermediate layer 3 are both polypropylene spunbond non-woven fabric layers, and the polypropylene spunbond non-woven fabric layer is preferably a single gram weight of 25-30 g/cm ² . Layer double S spunbond nonwoven layer.

The second intermediate layer 33 in the intermediate layer 3 is a polypropylene meltblown cloth layer treated with hydroentanglement electret, and the polypropylene meltblown cloth layer is made of polypropylene meltblown including 6-7wt.% electret masterbatch The polypropylene melt-blown cloth layer formed by melt extrusion, jet stretching and network reinforcement in turn, and the polypropylene melt-blown cloth layer is a single-layer polypropylene melt-blown cloth layer with a gram weight of 40-45g/cm ² , the fiber diameter in the polypropylene meltblown cloth layer is 0.5-0.8 microns.

The electret master batch in the above polypropylene melt-blown material includes the following components in terms of the total mass percentage of the electret master batch: inorganic electret powder 2-3wt.%, organic electret powder 5-6wt.% %, compatibilizer 3-8wt.%, processing aid 2-8wt.% and balance polypropylene resin. Wherein the inorganic electret powder is a powder mixture formed by mixing nano tourmaline powder and nano silicon dioxide according to the mass ratio of (5-6): 1, and wherein the particle size D90 of the nano tourmaline powder is 50-100nm, and the nanometer two The particle size D90 of the silicon oxide is 80-100 nm. The organic electret powder is fluorine-based polymer powder, and the average particle size of the fluorine-based polymer powder is 50-200 nm. The preferred fluorine-based polymer powder is polytetrafluoroethylene powder, perfluoropolymer powder At least one of polyethylene powder and tetrafluoroethylene-perfluoroethylene copolymer powder. The compatibilizer is at least one of maleic anhydride grafted polypropylene and glycidyl methacrylate grafted polypropylene. The processing aid includes at least one of polypropylene wax, stearic acid or stearate, and a silane coupling agent. Wherein the polypropylene adopts at least one of homopolymerized polypropylene and copolymerized polypropylene with melt index of 1500-2000 g/10min at 230°C/2.16kg.

The preparation process of the protective mask described in this specific embodiment mainly includes the following steps:

S1, the polypropylene melt-blown material including the electret masterbatch is melt-extruded, jet-stretched and reinforced on the melt-blown equipment to form a polypropylene melt-blown cloth layer, and then a spunlace electret equipment is used to stab in water. electret treatment of the polypropylene melt-blown cloth layer in a polar manner;

S2, place the five layers of raw material reels constituting the mask body on the conveying device for conveying the raw material reels in sequence, firstly place one layer of polypropylene melt-blown cloth layer after hydroentanglement electret treatment and two layers of polypropylene spunbond nonwoven The cloth layers are rolled synchronously, so that the polypropylene melt-blown cloth layer is sandwiched between two layers of polypropylene spunbond non-woven fabric layers, and then enters the compounding device and adopts the ultrasonic compound method to compound the three layers together to form an intermediate layer;

S3, the two layers of nylon fiber fabrics are synchronously fed into the roll, and after spraying polyurethane adhesive on the opposite sides of the two layers of nylon fiber fabrics, the middle layer is sandwiched between the two layers of nylon fiber fabrics by lamination Between the layers, a five-layer mask body fabric is formed;

S4, after the five-layer mask body fabric is transported to a mask forming device for forming, the protective mask is formed.

specific embodiment

Surface layer 1: a fabric layer made of nylon fibers, with a gram weight of 100g/cm ² ;

Inner layer 2: a fabric layer made of nylon fibers, with a gram weight of 120g/cm ² ;

The first intermediate layer 31: single-layer double-S spunbond non-woven fabric layer, gram weight 25g/cm ² ;

The second intermediate layer 32: a polypropylene melt-blown cloth layer with a gram weight of 45g/cm ² and a fiber diameter of 0.6 microns;

The third intermediate layer 33: a single-layer double-S polypropylene spunbond non-woven fabric layer, with a grammage of 25 g/cm ² .

The polypropylene melt-blown cloth layer is a polypropylene melt-blown cloth layer formed by sequentially melt extrusion, jet stretching and reinforcement of the polypropylene melt-blown material including 6 wt.% electret masterbatch. Stab electret treatment.

The electret master batch in the above-mentioned polypropylene melt-blown material comprises the following components by the total mass percentage of this electret master batch:

The inorganic electret powder formed by mixing nano tourmaline powder (D90 is 80nm) and nano-silica (D90 is 90nm) according to the mass ratio of 5:1 is 3wt.%;

6wt.% of organic electret powder formed by mixing polytetrafluoroethylene powder (average particle size 90nm) and perfluoropolyethylene powder (average particle size 95nm) in a mass ratio of 3:1;

Maleic anhydride grafted polypropylene 6wt.%, wherein the maleic anhydride graft ratio is 8%;

Processing aid polypropylene wax 3wt.%, stearic acid 0.5wt.%, silane coupling agent 1.0wt.%;

Polypropylene resin: homopolypropylene with melt index of 1500g/10min at 230°C/2.16kg.

The above-mentioned reusable protective masks were tested for performance, and the results were as follows:

Before aqueous: filtration efficiency PFE≥99% and BEF≥99%, ventilation resistance is 32Pa/cm ² ;

After 20 times of water washing: filtration efficiency PFE≥95% and BEF≥95%, ventilation resistance is 34Pa/cm ² .

The middle layer of the protective mask of the present invention adopts a layer of polypropylene meltblown cloth sandwiched between two layers of polypropylene spunbond non-woven fabrics, and the three layers are combined together by ultrasonic welding; The propylene spunbond non-woven fabric layer has the functions of stretching and water repellency, and the polypropylene meltblown cloth in the middle has the effect of filtering particles and carrying germs and virus droplets. The water-washing resistance is greatly increased; at the same time, the ultrasonic bonding and compounding method adopted can resist the impact of repeated washing, and can also greatly increase the water-washing resistance of the mask. Moreover, the addition amount of electret master batch in the polypropylene melt-blown material of the polypropylene melt-blown cloth layer of the mask of the present invention is increased to 6-7 wt.%, and the total amount of electret powder in this electret master batch reaches 7%. -9wt.%, at the same time, the electret powder used adopts the method of compounding inorganic electret powder and organic electret powder. The above-mentioned technical points can make the formed meltblown cloth produce the electret after hydroentanglement electret. The polar body is greatly increased, and static electricity can be generated by friction during the washing process after use, so as to ensure that the mask still has a high filtering effect after washing. In addition, the polypropylene meltblown cloth layer in the mask can generate more electrets by using spunlace electret instead of conventional electric electret, so as to make up for the electrodes lost during the spunlace electret process, which can ensure the melted electret after treatment. While the static electricity of spray cloth is saturated and the filtration efficiency is greatly improved, it can also make the non-woven fabric have better permeability, stable electret, long holding time, strong adsorption, low resistance, and filtration after use and washing. Less efficiency reduction. The mask of the invention has PFE≥99% and BEF≥99%, the number of times of washing can be as high as 20 times, and the filtration efficiency of the mask after washing can still reach PFE≥95% and BEF≥95%.

The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Several improvements and modifications are made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

A protective mask that can be washed repeatedly, comprising a mask body and ear straps fixed on opposite sides of the mask body, characterized in that: the mask body comprises a surface layer (1), an inner layer (2) and a set of An intermediate layer (3) between the surface layer and the inner layer, the intermediate layer (3) includes a first intermediate layer (31) and a second intermediate layer which are sequentially stacked and welded together by ultrasonic composite welding (32) and a third intermediate layer (33), wherein

The first intermediate layer (31) and the third intermediate layer (33) are both polypropylene spunbond nonwoven layers;

The second intermediate layer (33) is a polypropylene melt-blown cloth layer that has undergone hydroentanglement electret treatment, and the polypropylene melt-blown cloth layer is composed of polypropylene melt-blown materials including 6-7 wt. Polypropylene meltblown cloth layer formed by melt extrusion, jet stretching and web reinforcement.
The reusable protective mask according to claim 1, characterized in that: the polypropylene spunbond non-woven fabric layer used in the first intermediate layer (31) and the third intermediate layer (33) is a gram weight of 25- 30g/ cm2 of single-layer double-S spunbond nonwoven layer.
The reusable protective mask according to claim 1, characterized in that: the polypropylene melt-blown cloth layer used in the second intermediate layer (32) is a single - layer polypropylene melt-blown cloth with a gram weight of 40-45 g/cm. Spray layer.
The reusable water-washable protective mask according to claim 3, wherein the fiber diameter in the polypropylene meltblown cloth layer is 0.5-0.8 microns.
The re-washable protective mask according to claim 4, wherein inorganic electret powder particles and organic electret powder particles are dispersed in the fibers of the polypropylene meltblown cloth layer.
The reusable protective mask according to claim 5, wherein the particle diameter D90 of the inorganic electret powder particles is 50-100 nm, and the particle average particle diameter of the organic electret powder particles is 50-200nm.
The reusable protective mask according to claim 1, characterized in that: the surface layer (1) and the inner layer (2) are both cloth layers made of nylon fibers, and the gram weight of the cloth layer is 100 -130g/cm 2 .
The reusable protective mask according to claim 1, characterized in that: the surface layer (1) and the inner layer (2) are respectively attached to both sides of the middle layer (3) through a polyurethane adhesive layer. .