KR20220002036A - Transparent mask with visible mouth - Google Patents

Abstract

According to the present invention, an anti-fog mask comprises: a mask body having an opening on a front surface thereof; and an anti-fog transparent film covering the opening. The anti-fog transparent film comprises a film base material, an anti-fog layer, and an antibacterial coating layer. The anti-fog layer is made by mixing and polymerizing a first urethane acrylate oligomer, which is polymerized by including a first acrylic hydrophilic monomer, a second urethane acrylate oligomer, a second hydrophilic monomer, glycol acrylate and an initiator.

Description

Anti-fog mask {Transparent mask with visible mouth}

The present invention relates to a mask in which fogging does not occur in a transparent mask in which a certain opening is formed, so that the shape of a mouth can be easily identified.

With the spread of COVID-19, masks have become a necessity in our daily life. Such a mask is classified into a mask including an MB filter and a mask including a non-woven fabric filter. Due to the use of such a mask, there was a problem that the shape of the mouth was not visible to the conversation partner. Due to these problems, there was a big problem in the communication of the hearing impaired, and in addition, there were problems such as confusion about the contents that service workers or teachers wanted to convey.

In order to solve this problem, a film-shaped mask has been devised which has an opening on the entire surface of the mask and covers the opening. However, as the internal temperature and humidity increase due to the breathing of the human body, the film is fogged, and thus, there is a problem in that it is difficult to identify the shape of the mouth.

Republic of Korea Public Utility Model Publication No. 20-2018-0002801

It is an object of the present invention to provide an anti-fogging mask capable of smooth communication by preventing the occurrence of fogging in a transparent mask in which the shape of the mouth is visible.

Another object of the present invention is to provide an anti-fogging mask capable of stably covering an opening due to excellent mechanical properties and adhesion to the mask material.

Another object of the present invention is to provide a hygienic anti-fogging mask including an antibacterial coating layer.

The anti-fogging mask according to the present invention includes a mask body having an opening formed on the front side and an anti-fogging transparent film covering the opening,

The anti-fog transparent film is a film substrate; anti-fog layer; and an antibacterial coating layer;

The antifogging layer is characterized in that it is polymerized by mixing a first urethane acrylate oligomer, a second urethane acrylate oligomer, a second hydrophilic monomer, glycol acrylate and an initiator polymerized including the first acrylic hydrophilic monomer.

In the antifogging mask according to an embodiment of the present invention, the thickness of the transparent film may be 50 to 200 μm.

In the anti-fog mask according to an embodiment of the present invention, the anti-fog layer may be formed through photocuring or thermal curing.

In the antifogging mask according to an embodiment of the present invention, the first urethane acrylate oligomer may be characterized in that a first hydrophilic acrylic monomer, an isocyanate monomer and a polyfunctional acrylic monomer are polymerized.

In the antifogging mask according to an embodiment of the present invention, a molar ratio of the first hydrophilic monomer: the isocyanate monomer: the polyfunctional acrylic monomer may be 1:2 to 3:2 to 5.

In the antifogging mask according to an embodiment of the present invention, the antifogging layer comprises 25 to 40% by weight of a first urethane acrylate oligomer, 5 to 15% by weight of a second hydrophilic monomer, 10 to 20% by weight of glycol acrylate, and a second acrylic It may be characterized as comprising 15 to 30% by weight of a late oligomer and 3 to 15% by weight of an initiator.

In the antifogging mask according to an embodiment of the present invention, the antibacterial coating layer may include a zinc oxide dispersion.

Anti-fog mask according to the present invention comprises a mask body having an opening on the front side and an anti-fogging transparent film covering the opening, wherein the anti-fog transparent film is a film substrate; An anti-fog layer polymerized by mixing a hydrophilic acrylic monomer; and an antibacterial coating layer; to prevent fogging of the opening, to cover the opening stably, and to have excellent adhesion to the mask material, so that it is possible to prevent lifting or detachment of the film from the opening during long-term use. In addition, it has an advantage of being able to use hygienically and prevent bacterial propagation even after long-term use by including an antibacterial coating layer.

1 schematically shows an anti-fog mask according to an embodiment of the present invention.
Figure 2 shows a picture of wearing the anti-fog mask according to an embodiment of the present invention.
3 is a view illustrating and observing the degree of fogging of the anti-fogging mask (upper) and the mask (lower) showing the existing mouth shape according to an embodiment of the present invention.

Advantages and features of embodiments of the present invention, and methods of achieving them, will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the art to which the present invention pertains It is provided to fully inform those who have the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout.

In describing the embodiments of the present invention, if it is determined that a detailed description of a well-known function or configuration may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. In addition, the terms to be described later are terms defined in consideration of functions in an embodiment of the present invention, which may vary according to intentions or customs of users and operators. Therefore, the definition should be made based on the content throughout this specification.

The anti-fog mask according to the present invention comprises a mask body having an opening formed on the front side and an anti-fogging transparent film covering the opening,

The anti-fog transparent film is a film substrate; anti-fog layer; and an antibacterial coating layer;

The antifogging layer is characterized in that it is polymerized by mixing a first urethane acrylate oligomer, a second urethane acrylate oligomer, a second hydrophilic monomer, glycol acrylate and an initiator polymerized including the first acrylic hydrophilic monomer.

The antifogging mask according to the present invention comprises a first urethane acrylate oligomer polymerized including a first acrylic hydrophilic monomer, a second urethane acrylate oligomer, a second hydrophilic monomer, a glycol acrylate, and an initiator by mixing the polymerized antifogging layer. It has the advantage of enabling smooth communication because no steam is generated even in moisture and heat during actual use.

The first urethane acrylate oligomer in the antifogging mask according to an embodiment of the present invention is characterized in that the first hydrophilic acrylic monomer, the isocyanate monomer and the polyfunctional acrylic monomer are polymerized. By preparing and mixing the first urethane acrylate oligomer rather than directly mixing the entire amount of the hydrophilic monomer, uniform hydrophilicity can be secured and adhesion to the mask can be improved.

The first hydrophilic acrylic monomer may preferably use at least one selected from hexanediol diacrylate and hexanediol methacrylate. An acrylic monomer containing a hydroxyl group may be used as the hydrophilic acrylic monomer. However, in the case of polymerization using an acrylic monomer containing a hydroxyl group, the mask film and a part of the human body may adhere, or the moisture inside the mask is adsorbed to prevent fogging. There may be problems with lowering. However, by using the first hydrophilic acrylic monomer as in the present invention, while preventing the above-described problem due to high hydrophilicity, there is an advantage in that it is possible to prevent fogging due to water droplet formation by lowering the contact angle with water.

In the antifogging mask according to an embodiment of the present invention, the first urethane acrylate oligomer may be polymerized by mixing a polyfunctional acrylic monomer. There is an advantage of improving polymerization rate and efficiency by carrying out polymerization including such a polyfunctional acrylic monomer, and improving adhesion when attaching to a mask.

As a specific example, the polyfunctional acrylic monomer may use at least one selected from pentaerythritol tetraacrylate and pentaerythritol triacrylate, and by using such a polyfunctional monomer, polymerization efficiency with the above-mentioned hydrophilic acrylic monomer can be improved. have.

In addition, the isocyanate monomer included in the first urethane acrylate oligomer can be used without limitation when it is typically used for the synthesis of the urethane acrylate oligomer, and the present invention is not limited thereto. Preferably, the isocyanate monomer may be isophorone diisocyanate, but the present invention is not limited thereto.

In the antifogging mask according to an embodiment of the present invention, the first urethane acrylate oligomer comprises a first hydrophilic monomer: an isocyanate monomer: a polyfunctional acrylic monomer in a molar ratio of 1:2 to 3:2 to 5. do. When the amount of the first hydrophilic monomer is small, it is difficult to secure hydrophilicity, and when the amount of the first hydrophilic monomer is large, the transparency is lowered, and the antifogging efficiency is lowered by pulling moisture in the mask rather than may occur. In addition, when a large amount of polyfunctional acrylic monomer is included, it may be difficult to form a uniform oligomer due to an excessively fast polymerization rate.

In the anti-fog mask according to an embodiment of the present invention, the anti-fog layer may include 25 to 45 wt % of the first urethane acrylate oligomer. When the content of the first urethane acrylate oligomer is low, antifogging properties are deteriorated, and when the content of the first urethane acrylate oligomer is high, it may be difficult to form a uniform film layer.

In the antifogging mask according to an embodiment of the present invention, the first urethane acrylate oligomer can be reacted by dissolving the solid content in a solvent such as ketone, preferably polymerized after the solid content is 40 to 60 wt% can be performed. If the solid content is low, the reaction efficiency may be lowered, and if the solid content is high, there may be a problem in that it is difficult to uniformly mix with other components of the antifogging layer due to overpolymerization.

In the anti-fog mask according to the present invention, the anti-fog layer may include a second urethane acrylate oligomer. As the second urethane acrylate oligomer, a commercially available conventional urethane acrylate oligomer may be used, preferably an aliphatic urethane acrylate oligomer, and more preferably, an aliphatic viscosity at 25° C. of 60,000 to 90,000 cP. can By using the second urethane acrylate oligomer satisfying the above-mentioned range, there is an advantage in that the antifogging layer can be stably maintained for a long period of time.

In the antifogging mask according to an embodiment of the present invention, the antifogging layer may contain 15 to 30% by weight of the second urethane acrylate oligomer. When a small amount of the second urethane acrylate oligomer is included, it may be difficult to secure a certain level of mechanical strength.

In the anti-fog mask according to the present invention, the anti-fog layer includes a second hydrophilic monomer. A hydrophilic monomer is mixed with the first urethane acrylate oligomer, and a hydrophilic monomer is mixed together with the polymerized urethane acrylate oligomer to finally form an anti-fog layer, thereby increasing the hydrophilicity of the anti-fog layer surface and maximizing the anti-fog effect. There are advantages.

In this case, the second hydrophilic monomer may be the same as or similar to the first hydrophilic monomer, and as described above, by using a hydrophilic monomer that does not contain a hydroxyl group, adhesion or moisture adsorption is prevented and stable even for long-term use. This has the advantage of preventing fogging.

In the anti-fog mask according to an embodiment of the present invention, the anti-fog layer may contain 5 to 15 wt % of the second hydrophilic monomer. When a small amount of the second hydrophilic monomer is included, anti-fogging efficiency may be lowered, and if a large amount of the second hydrophilic monomer is included, the transparency of the entire transparent film may be lowered, and a problem of lowering visibility due to moisture adsorption may occur. .

In the anti-fog mask according to the present invention, the anti-fog layer further includes glycol acrylate, and specifically, polyethylene glycol diacrylate may be used as the glycol acrylate. By including such glycol acrylate, there is an advantage in that it is possible to increase the hydrophilicity and improve the binding force with the film substrate. In this case, the polyethylene glycol diacrylate means to include an acryl group or a methacryl group at both ends of the polyethylene glycol.

More specifically, the polyethylene glycol diacrylate may have an average molecular weight of 300 to 800, and if the molecular weight is low, the adhesion to the film substrate may be low, and if the molecular weight is high, it may be difficult to form a uniform anti-fog layer. have.

In the antifogging mask according to an embodiment of the present invention, the antifogging layer may contain 10 to 20% by weight of the glycol acrylate, and when a small amount of glycol acrylate is included, the antifogging effect may be lowered due to decreased hydrophilicity, When a large amount of glycol acrylate is included, it may cause discomfort in use by forming adhesive force with the human body surface.

In the anti-fog mask according to an embodiment of the present invention, the anti-fog layer may contain 3 to 15 wt % of the initiator. At this time, since the specific coating method may be different in the case of performing photopolymerization and the case of performing thermal polymerization, it will be separately described below.

In the case of photopolymerization, commercially available photoinitiators such as the Irgacure series can be used without limitation. In a specific coating method, the antifogging layer is a first urethane acrylate oligomer polymerized including a first acrylic hydrophilic monomer, a second urethane acrylate oligomer, a second hydrophilic monomer, a glycol acrylate and an antifogging solution in which an initiator is mixed can be applied on a film substrate and cured by irradiating ultraviolet rays. In this case, the applied thickness may be 2 to 8 μm, but the present invention is not limited thereto, and the antifogging layer can be formed through such ultraviolet irradiation.

When performing thermal polymerization, commercially available thermal initiators may be used without limitation, and thermal initiators such as AIBN may be used, but the present invention is not limited thereto. However, in the case of using a thermal initiator, the polymerization of the first urethane acrylate oligomer, the second urethane acrylate oligomer, the second hydrophilic monomer, the glycol acrylate and the initiator including the first acrylic hydrophilic monomer is not in the form of a film, but in a separate container. to synthesize a thermally initiated antifogging composition. Synthesized anti-fogging composition for heat-initiated: After mixing the acrylic resin in a weight ratio of 1:1 to 3:1, a coating solution is prepared so that the solid content is 5 to 15% by weight through a methyl ethyl ketone solvent, and this is applied on the film substrate can do.

At this time, the coating solution in which the heat-initiated anti-fogging composition and acrylic resin are mixed can be coated to a thickness of 300 to 800 nm. may occur.

In the antifogging mask according to an embodiment of the present invention, the thickness of the film substrate may be 50 to 200 μm. When the thickness of the film substrate is thin, it is easily torn or split, making it difficult to use the mask, and when the thickness of the film substrate is thick, there is a problem in that it is difficult to secure flexibility.

In the anti-fogging mask according to an embodiment of the present invention, the antibacterial coating layer may be a coating layer coated with a zinc oxide dispersion, and more specifically, the anti-fogging coating layer is formed by mixing the anti-fog forming solution and the zinc oxide dispersion, and then curing it. can be formed by

At this time, 5 to 15 g of the zinc oxide dispersion may be added per 100 g of the solvent, and 10 to 30 parts by weight of the zinc oxide dispersion is mixed with 100 parts by weight of the antifogging solution, and then cured to form an antibacterial coating layer. In this case, the thickness of the mixed dispersion may be 2 to 10 μm, and when the thickness of the dispersion is thin, it is difficult to exhibit antibacterial properties, and when the thickness of the dispersion is thick, there may be a problem that the anti-fogging effect is lowered.

Hereinafter, the present invention will be specifically described by way of Examples and Comparative Examples. The examples below are only for helping understanding of the present invention, and the scope of the present invention is not limited by the examples below.

[Production Example 1]

1. Synthesis of first urethane acrylate oligomer

HDDA (1,6-hexanediol diacrylate) as the first acrylic hydrophilic monomer, IPDI (isophorone diisocyanate) as the isocyanate monomer, and PETIA (pentaerythritol triacrylate) as the polyfunctional acrylic monomer 1:2:2.5 It was dissolved in MEK (methyl ethyl ketone) solvent at a molar ratio of , and then polymerized to a solid content of 50%. At this time, the polymerization temperature is 40~60℃, and after 24 hours of reaction, the peak -NCO, 2270 cm-1. It was confirmed that there was a decrease in the vicinity, and the reaction was terminated.

2. Preparation of anti-fog layer

30 g of the first urethane acrylate oligomer, 10 g of HDDA (1,6-hexanediol diacrylate), 15 g of PEG400DA (polyethylene glycol diacrylate) having an average molecular weight of PEG unit of 400 as glycol acrylate, 15 g of the second urethane 20 g of acrylate oligomer (Ebecryl EB-1290) and 8 g of photoinitiator (Irgacure 184) were mixed and added, and as a solvent for viscosity control, PM (polyethylene glycol monomethyl ether) and MEK were used to prepare an antifogging layer forming solution.

The prepared coating solution was coated on a PET film with a thickness of 100 μm to a dry film thickness of about 5 μm by macrogravure, and UV-cured with an amount of light of 400 mj to prepare an anti-fogging layer.

3. Preparation of antimicrobial coating layer

100 g of zinc oxide powder, 12 g of a dispersing agent (disperbyk-110, manufactured by BYK), 250 g of methyl ethyl ketone, and 250 g of 4-methyl-2-pentanone were mixed, and 500 g of zirconia beads with a diameter of 1 mm were added, followed by a high-speed bead mill. A zinc oxide dispersion was prepared by dispersing for 24 hours.

50 g of the prepared zinc oxide dispersion and 200 g of the antifogging layer forming solution of Example 1 were mixed and coated to a thickness of about 5 μm, followed by UV curing to form an antibacterial coating layer.

[Production Example 2]

1. Preparation of Thermal Initiated Antifogging Compositions

30 g of the first urethane acrylate oligomer prepared in Example 1, 10 g of the second hydrophilic monomer HDDA (1,6-hexanediol diacrylate), and PEG400DA (polyethylene glycol diacrylate) having an average molecular weight of 400 PEG units 15 g, 20 g of urethane acrylate oligomer, and PM (propylene glycol monomethyl ether) and MEK (methyl ethyl ketone) as the solvent for viscosity control. Droping, and the reaction was terminated after 24 hours at 80 ℃ to prepare a heat-initiated anti-fogging oligomer.

2. Formation of anti-fog layer

The antifogging oligomer synthesized above and the acrylic resin in which methyl methacrylate and ethyl methacrylate are polymerized (average molecular weight = 5,000 to 10,000, AMACR-1020E) are mixed in a weight ratio of 2 : 1 and methyl ethyl to 10% solid content. After adjusting the viscosity by adding a ketone, a 100 μm thick PET film was coated with a dry film to a thickness of about 500 nm using macrogravure, and cured at 120° C./2 min to prepare an antifogging layer.

3. Preparation of antibacterial coating layer

The antibacterial coating layer was prepared in the same manner as in Example 1.

[Comparative Preparation Example 1]

A mask including a transparent opening was manufactured by attaching only a PET film with a thickness of 100 μm to the mask opening without an antifogging layer and an antibacterial coating layer.

Comparison of anti-fog effect

Put about 100 ml of water at 60 ° C in a paper cup, lift the ball-point pen cap to confirm identification, put the masks of Preparation Example 1 (upper) and Comparative Preparation Example 1 (lower) on each paper cup, and remove the ball-point pen cap after 1 minute. Whether or not identification was observed was shown in FIG. 3 .

3, in the case of Preparation Example 1 in which the anti-fogging coating layer is formed, it can be confirmed that the ball-point pen cap is clearly identifiable.

[Production Example 3]

It was prepared in the same manner as in Preparation Example 1, but 3 g of HDDA was added in the manufacturing process of the anti-fog layer to prepare a solution for forming an anti-fogging layer, and then a mask was prepared by coating it.

As a result of testing this using a paper cup filled with warm water, it was confirmed that the discrimination ability of the object inside the paper cup was low.

[Production Example 4]

It was prepared in the same manner as in Preparation Example 1, but 22 g of HDDA was added in the process of preparing the anti-fog layer to prepare a solution for forming an anti-fogging layer, and then coated to prepare a mask.

As a result of visually observing the manufactured mask, it was confirmed that the transparency of the transparent film was low, making it difficult to identify the shape of the mouth when wearing the mask.

Claims (7)

It includes a mask body having an opening on the front side and an anti-fogging transparent film covering the opening,
The anti-fog transparent film is a film substrate; anti-fog layer; and an antibacterial coating layer;
The antifogging layer is an antifogging mask, characterized in that it is polymerized by mixing a first urethane acrylate oligomer, a second urethane acrylate oligomer, a second hydrophilic monomer, glycol acrylate and an initiator polymerized including a first acrylic hydrophilic monomer . The method of claim 1,
Anti-fog mask, characterized in that the thickness of the transparent film is 50 to 200㎛. The method of claim 1,
The anti-fog mask, characterized in that the anti-fog layer is formed through photo-curing or thermal curing. The method of claim 1,
The first urethane acrylate oligomer is an antifogging mask, characterized in that the first hydrophilic acrylic monomer, isocyanate monomer and polyfunctional acrylic monomer are polymerized. The method of claim 1,
The anti-fog mask, characterized in that the molar ratio of the first hydrophilic monomer: isocyanate monomer: polyfunctional acrylic monomer is 1:2 to 3:2 to 5. The method of claim 1,
The antifogging layer comprises 25 to 40 wt% of a first urethane acrylate oligomer, 5 to 15 wt% of a second hydrophilic monomer, 10 to 20 wt% of glycol acrylate, 15 to 30 wt% of a second acrylate oligomer, and 3 to 15 wt% of an initiator Anti-fog mask, characterized in that it comprises a weight percent. The method of claim 1,
The anti-fogging mask, characterized in that the antibacterial coating layer comprises a zinc oxide dispersion.

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