JP2020156801A - Face mask and method for producing the same - Google Patents

Abstract

To prevent the occurrence of liquid dripping, cause a chemical solution to effectively permeate skin, and prevent the occurrence of stickiness.SOLUTION: A face mask 100 coats at least part of a face, the face mask 100 (sheet material 1) being impregnated with a chemical solution containing CNFs (cellulose nanofibers).SELECTED DRAWING: Figure 1

Description

The present invention relates to a face mask and a method for producing the same.

Conventionally, face masks are impregnated with chemicals such as lotion and beauty essence for the purpose of moisturizing and water-retaining the skin, and are required to contain a large amount of chemicals in order to enhance the moisturizing effect and water-retaining effect.
Therefore, a face mask provided with a nanofiber layer made of nanofibers has been proposed for the purpose of containing a large amount of a chemical solution (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2018-100469

However, with the face mask described in Patent Document 1, there is a risk that dripping may occur when the sheet of the face mask is taken out and when it is attached. Further, there is a problem that the chemical solution is wasted due to the occurrence of this dripping, and the chemical solution cannot be effectively permeated into the skin when the face mask is worn.
Therefore, it is conceivable to use a thickener for the purpose of suppressing the occurrence of dripping and effectively permeating the drug solution into the skin, but the use of the thickener may cause stickiness.

An object of the present invention is to provide a face mask and a method for producing the same, which can suppress the occurrence of dripping, effectively permeate the chemical solution into the skin, and further suppress the occurrence of stickiness.

In order to solve the above problems, the invention according to claim 1 is
A face mask that covers at least a part of the face
The face mask is impregnated with a chemical solution containing cellulose nanofibers.
According to the present invention, it is possible to suppress the occurrence of dripping, effectively permeate the chemical solution into the skin, and further suppress the occurrence of stickiness.

The invention according to claim 2 is the face mask according to claim 1.
The content of the cellulose nanofibers in the chemical solution is 0.1 to 1% by mass.
According to the present invention, the occurrence of dripping can be suppressed more effectively. In addition, the chemical solution can be more effectively permeated into the skin. Furthermore, the occurrence of stickiness can be suppressed more effectively.

The invention according to claim 3 is the method for manufacturing a face mask according to claim 1 or 2.
It is characterized by including a step of impregnating the sheet material forming the face mask with the chemical solution.
According to the present invention, it is possible to suppress the occurrence of dripping, effectively permeate the chemical solution into the skin, and further suppress the occurrence of stickiness.

According to the present invention, it is possible to suppress the occurrence of dripping, effectively permeate the chemical solution into the skin, and further suppress the occurrence of stickiness.

It is a front view which shows the face mask which concerns on embodiment.

Hereinafter, a specific embodiment of the face mask 100 according to the embodiment of the present invention will be described with reference to FIG. However, the technical scope of the present invention is not limited to the illustrated examples, and is determined based on the description of the scope of claims.

[Description of configuration]
As shown in FIG. 1, the face mask 100 covers the entire face (excluding eyes, nose, and mouth) of the user, and is made of the sheet material 1. The face mask 100 may be composed of one sheet material 1 or may be formed by laminating a plurality of sheet materials 1.

The sheet material 1 is provided with openings 2 at locations corresponding to the eyes, nose, and mouth. The material of the sheet material 1 may be any material having impregnation property with a chemical solution (for example, woven fabric, non-woven fabric, paper, etc.) and is not particularly limited. For example, recycled fibers such as rayon and cupra, olefin-based fibers such as polyethylene and polypropylene, synthetic fibers such as polyester and polyamide, natural fibers such as cotton, and mixed fibers and composite fibers in which two or more of these are used. Etc. can be exemplified. The basis weight of the sheet material 1 is preferably ²⁰ to 100 g / m ² . As described above, when a plurality of sheet materials 1 are laminated to form the face mask 100, the materials of the sheet materials 1 may be the same material or different materials from each other.

Further, the sheet material 1 is impregnated with a chemical solution containing cellulose nanofibers (hereinafter referred to as CNF). The content of CNF in the chemical solution is preferably 0.1 to 1% by mass.

Here, CNF refers to fine cellulose fibers obtained by defibrating pulp fibers, and generally refers to cellulose fibers containing cellulose fine fibers having an average fiber width of nano size (1 nm or more, 1000 nm or less).

Pulp fibers that can be used in the production of CNF include chemical pulps such as broadleaf pulp (LBKP) and coniferous pulp (NBKP), bleached thermomechanical pulp (BTMP), stone ground pulp (SGP), and pressurized stone ground pulp (PGW). ), Refiner Gland Pulp (RGP), ChemiGrand Pulp (CGP), Thermogrand Pulp (TGP), Gland Pulp (GP), Thermomechanical Pulp (TMP), Chemithermo Mechanical Pulp (CTMP), Refiner Mechanical Pulp (RMP) Machine pulp, tea waste paper, craft envelope waste paper, magazine waste paper, newspaper waste paper, leaflet waste paper, office waste paper, cardboard waste paper, upper white waste paper, Kent waste paper, imitation waste paper, ground ticket waste paper, waste paper waste paper, etc. Examples thereof include pulp and deinked pulp (DIP) obtained by deinking waste paper pulp. These may be used alone or in combination of a plurality of types as long as the effects of the present invention are not impaired.

Examples of the method for producing CNF include mechanical methods such as a high-pressure homogenizer method, a microfluidizer method, a grinder grinding method, a bead mill freeze crushing method, and an ultrasonic defibration method, but are limited to these methods. is not.
For example, pulp fibers that have been subjected to a mechanical defibration treatment may be subjected to a chemical treatment such as carboxymethylation, or may be subjected to an enzymatic treatment. Examples of the chemically treated CNF include iCNF (individualized CNF) (single nanocellulose) having a diameter of 3 to 4 nm, such as TEMPO oxide CNF, phosphate esterified CNF, and phosphite esterified CNF. Be done.
Further, the CNF that has been chemically or enzyme-treated may be subjected to a mechanical defibration treatment.

The CNF used in the present embodiment preferably has an average fiber width of 1 nm to 100 nm calculated by the method described later.

As the CNF that can be specifically used, for example, a CNF with 100% NBKP and an average fiber width (median diameter) of 49 nm of the CNF can be mentioned. This CNF was obtained by subjecting NBKP to a refiner treatment for rough defibration, and then treating the NBKP four times with a high-pressure homogenizer to defibrate.

Here, a method for measuring the fiber width (average fiber width) of CNF will be described.
First, 100 ml of an aqueous dispersion of cellulose nanofibers having a solid content concentration of 0.01 to 0.1% by mass is filtered through a membrane filter made of Teflon (registered trademark), and the solvent is once with 100 ml of ethanol and three times with 20 ml of t-butanol. Replace.
Next, it is freeze-dried and coated with osmium to prepare a sample. For this sample, an electron microscope SEM image was used at a magnification of 5000 times, 10000 times, or 30000 times (for the CNF described in paragraph 0021, a magnification of 30000 times was used) depending on the width of the constituent fibers. Make an observation. Specifically, two diagonal lines are drawn on the observation image, and three straight lines passing through the intersections of the diagonal lines are arbitrarily drawn. Further, the width of a total of 100 fibers intersecting with these three straight lines is visually measured. Then, the median diameter (median diameter) of the measured value is taken as the average fiber width. The average fiber width is not limited to the medium diameter of the measured value, and may be, for example, a number average diameter or a mode diameter (mode diameter).

[Explanation of manufacturing method]
Next, a method of manufacturing the face mask 100 according to the embodiment will be described.
(1) The base sheet is cut and formed into the shape of sheet material 1 (see FIG. 1).
(2) The base sheet formed in the shape of the sheet material 1 is impregnated with a chemical solution containing CNF.

[Explanation of effect]
The face mask 100 according to the embodiment is a face mask 100 that covers at least a part of the face, and the face mask 100 (sheet material 1) is impregnated with a chemical solution containing CNF. As a result, thixotropy can be imparted to the chemical solution, so that dripping can be suppressed when the face mask is taken out and worn, and the chemical solution can be effectively permeated into the skin. Further, since it is not necessary to use a thickener by containing CNF in the chemical solution, it is possible to suppress the occurrence of stickiness due to the use of the thickener.

Next, the results of the dripping test and the contact angle measurement test of the droplets of the chemical solution, which were carried out for each of the face mask according to the embodiment and the conventional face mask, will be described with reference to Tables 1 and 2.

<Method of dripping test>
Three sheet pieces (Example 1, Comparative Example 1, Comparative Example 2) impregnated with the chemical solution in an amount of 1500% by mass based on the dry weight of the sheet were held with tweezers for 1 minute, and the weight of the chemical solution dropped during this period (g). ) Is measured. This measurement is carried out three times in each of Example 1, Comparative Example 1 and Comparative Example 2, and the average value of the measured values of each of the three times is calculated. The test results are shown in Table 1.

Here, the chemical solution of Example 1 is obtained by adding CNF (0.5%) that has been mechanically treated to a predetermined main component. On the other hand, the chemical solution of Comparative Example 1 is obtained by adding glycerin (0.5%) to a predetermined principal component common to that of Example 1, and the chemical solution of Comparative Example 2 is common to that of Example 1 and Comparative Example 2. Purified water is added to the predetermined main component of.

As shown in Table 1, it was found that the amount of dripping from the sheet piece of Example 1 was smaller than the amount of dripping from the sheet piece of Comparative Example 1 and Comparative Example 2. That is, it was found that the amount of dripping from the sheet piece was reduced by containing CNF in the chemical solution.

<Method of contact angle measurement test>
2.0 μL of each chemical solution of Example 1, Comparative Example 1 and Comparative Example 2 is dropped on a flat plate-shaped paper, and the contact angle of the droplet (the angle formed by the tangent of the droplet and the paper surface) is measured. .. This measurement is carried out three times in each of Example 1, Comparative Example 1 and Comparative Example 2, and the average value of the measured values of each of the three times is calculated. The test results are shown in Table 2.

As shown in Table 2, it was found that the contact angle of the droplets of Example 1 was larger than the contact angle of the droplets of Comparative Example 1 and Comparative Example 2. Here, it can be said that the larger the contact angle of the droplet, the higher the surface tension and the less likely it is to drip. That is, it was found that the inclusion of CNF in the chemical solution increases the contact angle of the droplets and makes it difficult for the solution to drip.

Next, the results of a moisturizing test conducted on the face mask according to the embodiment and the conventional face mask will be described with reference to Table 3.

<Test method>
The weights of the four sheet pieces (Example 2, Example 3, Comparative Example 3, and Comparative Example 4) impregnated with the chemical solution in an amount of 1000% by mass based on the dry weight of the sheet are measured immediately before being placed in the constant temperature bath. Then, each of the four sheet pieces was allowed to stand in a constant temperature bath at 60 ° C., the weight of each sheet piece was measured after 10 minutes and 20 minutes had passed, and the transpiration rate (%) from the sheet pieces was measured based on the following calculation formula. ) Are calculated respectively. The test results are shown in Table 3.
Transpiration rate (%) = (G1-G2) x 100 / G1
G1; Weight of sheet piece immediately before being placed in a constant temperature bath (g)
G2; Weight (g) of sheet piece t minutes after being placed in a constant temperature bath

Here, the chemical solution of Example 2 is obtained by adding CNF (0.5%) that has been mechanically treated to a predetermined main component common to that of Example 1 and the like. The chemical solution of Example 3 is obtained by adding TEMPO-oxidized CNF (0.5%) to a predetermined principal component common to that of Example 1 and the like. On the other hand, the chemical solution of Comparative Example 3 is obtained by adding glycerin (0.5%) to a predetermined main component common to that of Example 1 and the like. The chemical solution of Comparative Example 4 is obtained by adding purified water to a predetermined main component common to that of Example 1 and the like.

As shown in Table 3, it was found that the transpiration rate from the sheet pieces of Examples 2 and 3 was lower than the transpiration rate from the sheet pieces of Comparative Example 3 and Comparative Example 4. That is, it was found that by containing CNF in the chemical solution, it is possible to further suppress the evaporation of the chemical solution from the sheet piece. Therefore, by suppressing the evaporation of the chemical solution from the sheet piece, the chemical solution can be effectively permeated into the skin.

Next, the results of the sensory evaluation performed on the face mask according to the embodiment and the conventional face mask will be described with reference to Table 4.

<Evaluation method>
Six women touched three sheet pieces (Example 4, Comparative Example 5, Comparative Example 6) impregnated with a chemical solution in an amount of 1500% by mass based on the dry weight of the sheet, and "smooth feeling" and "moisturizing property". 5 of "Good (Score 5)", "Slightly good (Score 4)", "Neither (Score 3)", "Somewhat bad (Score 2)""Not good (Score 1)" I had them answer in a graded evaluation. The evaluation results are shown in Table 4. Each numerical value shown in Table 4 is an average score of the evaluation points by the above 6 persons.

Here, the chemical solution of Example 4 is obtained by adding CNF (0.5%) that has been mechanically treated to a predetermined main component common to that of Example 1 and the like. On the other hand, the chemical solution of Comparative Example 5 is obtained by adding glycerin (0.5%) to a predetermined main component common to that of Example 1 and the like. The chemical solution of Comparative Example 6 is obtained by adding purified water to a predetermined main component common to that of Example 1 and the like.

As shown in Table 4, it was found that the sheet piece of Comparative Example 5 had a high score regarding moisturizing property, but a low score regarding smoothness. Further, it was found that the sheet piece of Comparative Example 6 had a high score regarding the smooth feeling, but a low score regarding the moisturizing property. That is, it was found that the sheet pieces of Comparative Example 5 and Comparative Example 6 could not have both a smooth feeling and a moisturizing property. On the other hand, it was found that the sheet piece of Example 4 had a high score regarding the smooth feeling and a score regarding the moisturizing property. That is, it was found that by containing CNF in the chemical solution, it is possible to have both a silky feeling and a moisturizing property.

100 Face mask 1 Sheet material 2 Opening

Claims (3)

A face mask that covers at least a part of the face
The face mask is impregnated with a chemical solution containing cellulose nanofibers. The face mask according to claim 1, wherein the content of the cellulose nanofibers in the chemical solution is 0.1 to 1% by mass. The method for manufacturing a face mask according to claim 1 or 2.
A method for producing a face mask, which comprises a step of impregnating the sheet material forming the face mask with the chemical solution.

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