TW201930666A - Liquid retention nonwoven fabric and face mask containing the same - Google Patents

Abstract

Conventionally, many studies have been conducted on liquid retentive nonwoven fabrics such as that used for face masks and the like, and most of them are mainly made of cellulosic fibers. However, nonwoven fabrics using cellulose-based fibers has problems of that the permanent deformation during being wetted period is large and thereby it is difficult in increasing the liquid retention amount, as well as the amount of the liquid transferred to the skin is small due to the fact that liquid is absorbed into the interior of the fibers. The present invention has been made in view of the current state of the art. An object of the present invention is to provide a nonwoven fabric, which has an excellent appearance, high liquid retention property, and the retained liquid can be effectively released, when it is used for a mask or the like. A liquid retention nonwoven fabric is characterized in that the content of the acrylic fiber is 30% or more, the liquid retention rate measured by the suspension method is 680 to 2000%, and the liquid retention rate after centrifugal dewatering is 10 to 55%.

Description

Liquid-repellent non-woven fabric and mask containing the same

The present invention relates to a liquid-repellent nonwoven fabric and a mask containing the nonwoven fabric.

In the case of a liquid-repellent non-woven fabric used for a conventional mask or the like, a material mainly composed of a cellulose-based fiber is proposed. For example, in [0016] of Patent Document 1, a nonwoven fabric suitable for use as a mask sheet has been disclosed, which is from 30% by weight to 70% by weight of kraft pulp and 70% by weight to 30% by weight of denier exceeding 0.8. The dtex is blended with a non-woven fabric.

Further, Patent Document 2 discloses a chemical liquid impregnated sheet which is obtained by laminating at least one or more layers of fine cellulose fibers on a surface of one side or both sides of a nonwoven fabric layer containing cellulose fibers. The non-woven fabric structure in which the layer is integrated with the nonwoven fabric layer containing the cellulose fibers is impregnated with the chemical liquid.
Advanced Technology Literature
Patent Literature

[Patent Document 1] JP-A-2008-205223, Patent Document 2, JP-A-2014-205924

"The subject to be solved by the invention"

However, the non-woven fabric using cellulose fibers has a large permanent deformation upon wetting and becomes like a paper, so that it is difficult to increase the liquid retention amount. Further, the cellulose-based fiber sucks the liquid into the inside of the fiber. Therefore, when a non-woven fabric made of a cellulose-based fiber is used, for example, when a mask is used, in addition to the inability to contain a large amount of the lotion component, the lotion component is inhaled inside the fiber, so that the lotion component moves toward the skin. The problem of less quantity. Further, particularly in the case of using rayon fibers, there is a problem that the obtained mask lacks transparency and has an unfavorable appearance.

The present invention has been made in view of the circumstances of the prior art, and an object of the present invention is to provide a nonwoven fabric which has an excellent appearance and high liquid retention property when used in a mask or the like, and can maintain the liquid to be retained. Efficiently released.
"Means to solve the problem"

As a result of intensive review, the inventors of the present invention found that a non-woven fabric containing a certain amount or more of an acrylic fiber can hold a large amount of lotion between fibers and can be sucked into the inside of the fiber. The present invention has been completed by the fact that the amount of the lotion is small and the appearance transparency is excellent.

That is, the present invention has been achieved by the following means.
(1) A liquid-repellent non-woven fabric characterized in that the content of the acrylic fiber is 30% or more; the liquid retention rate by the suspension method is 680 to 2000%; and the liquid retention rate after centrifugal dewatering is 10 ~55%.
(2) The liquid-repellent non-woven fabric according to (1), wherein the Young's modulus of the acrylic fiber is 15 to 80 cN/dtex when wet.
(3) The liquid-repellent non-woven fabric according to (1) or (2), wherein the acrylic fiber has a fineness of 0.3 to 3.5 dtex.
(4) The liquid-repellent non-woven fabric according to any one of (1) to (3), wherein the non-woven fabric density is 0.10 to 0.20 g/cm3.
(5) The liquid-repellent non-woven fabric according to any one of (1) to (4), wherein the fiber length of the acrylic fiber is divided by the fiber diameter by an aspect ratio of 1,000 to 6,000.
(6) The liquid-repellent non-woven fabric according to any one of (1) to (5), wherein the fiber cross-section of the acrylic fiber is circular.
(7) A mask comprising the liquid-repellent non-woven fabric according to any one of (1) to (6).
Invention effect

The liquid-repellent non-woven fabric of the present invention is a substance having a characteristic that a large amount of liquid can be held between fibers and a liquid inside the fiber can be reduced. In the liquid-repellent non-woven fabric of the present invention having such characteristics, it is possible to obtain an effect of increasing the amount of movement of the lotion to the skin when used in, for example, a mask.

Hereinafter, the present invention will be described in detail. In the liquid-repellent non-woven fabric of the present invention, the lower limit of the liquid retention rate measured by the suspension method to be described later is 680% or more, preferably 690% or more, and more preferably 700% or more. Further, the upper limit is 2000% or less, preferably 1500% or less, and more preferably 1300% or less. When the liquid retention rate measured by the suspension method is less than 680%, the amount of the inhalation liquid is insufficient. Therefore, when it is used for a mask or the like, a sufficient effect of the makeup component is not obtained, and drying is performed early. The possibility of easy peeling and the like. In addition, when the liquid retention rate measured by the suspension method is more than 2000%, it is likely to cause dripping of the lotion when it is used for a mask or the like, and thus the feeling of use is not good.

Moreover, the lower limit of the liquid retention rate after centrifugal dewatering of the liquid-repellent nonwoven fabric of the present invention is 10% or more, preferably 15% or more, and more preferably 18% or more. Further, the upper limit is preferably 55% or less, preferably 50% or less, and more preferably 45% or less. When the liquid retention rate after the centrifugal dehydration is less than 10%, when it is used for, for example, a mask, the skin conformability due to the nonwoven fabric is deteriorated, so that peeling off is easy. Moreover, when the liquid retention rate after centrifugal dehydration exceeds 55%, the amount of liquid sucked into the inside of the fiber is shown in a large amount, and it is maintained even if the liquid retention rate measured by the suspension method satisfies the above range. The amount of liquid released is reduced. Therefore, when it is used for a mask or the like, the amount of movement of the lotion to the skin becomes insufficient.

Moreover, the content of the acrylic fiber of the liquid-repellent nonwoven fabric of the present invention is 30% or more, preferably 40% or more, more preferably 50% or more, and may be 100%. By setting the content of the acrylonitrile-based fibers to 30% or more, the above-described liquid retention rate measured by the suspension method and the liquid retention rate after centrifugal dehydration can be within the above-mentioned range.

For this reason, it is judged that the acrylic fiber can have a low specific moisture content and can maintain a high Young's modulus even when wet. The Young's modulus of such an acrylic fiber is preferably 15 cN/dtex or more, more preferably 20 cN/dtex or more, and more preferably 30 cN/dtex or more. On the other hand, the Young's modulus of the cellulose fiber which can be used for the mask from the past has a Young's modulus of 3 cN/dtex, and even if it is very high, it stays at 10 cN/dtex and less than 15 cN/dtex. From such a viewpoint, it can be inferred that by using such an acrylic fiber, it is difficult to permanently deform even if a liquid is retained, and the liquid retention rate measured by the suspension method becomes high. Further, from the viewpoint of the low water content, it is estimated that the amount of liquid in the inside of the inhaled fiber is small, and the liquid retention rate after centrifugal dehydration is lowered. Further, when the upper limit of the Young's modulus of the acrylic fiber is wet, in consideration of the use of the mask, the skin contact property is deteriorated when the Young's modulus at the time of wetting is too high, preferably 80 cN/ Below dtex, the better is 70 cN/dtex or less, and more preferably 60 cN/dtex or less.

The acrylic fiber used in the present invention is a material composed of an acrylonitrile polymer. Such an acrylonitrile-based polymer is desirably 40% by weight or more of the polymerization composition, preferably acrylonitrile, and acrylonitrile is preferably 50% by weight or more, and more preferably 80% by weight or more. Therefore, the acrylonitrile-based polymer may be a copolymer of acrylonitrile and another monomer in addition to the individual polymer of acrylonitrile. The other monomer in the copolymer is not particularly limited; however, for example, it may be an ethylene halide and a vinylidene halide; and a (meth) acrylate (in addition, a (meth)) a substance having the methyl group attached thereto and a methyl group not attached thereto; a sulfonic acid group such as methallylsulfonic acid or p-styrenesulfonic acid containing a monomer and a salt thereof; The carboxylic acid group of acrylic acid, itaconic acid or the like contains a monomer and a salt thereof; decylamine acrylate, styrene, vinyl acetate or the like. Representative materials of such acrylic fibers are, for example, acrylic fibers and modified acrylic fibers.

Further, the acrylic fiber to be used in the present invention may be a material containing other components in addition to the above-mentioned acrylonitrile-based polymer. Other components of this type may be, for example, a hydrophilic component, an antibacterial agent, a toner, or the like. The hydrophilic component may be, for example, an organic polymer compound having a hydrophilic side chain such as a polyepoxyalkyl chain, a polyether guanamine chain or a polyether ester chain, or a hydrophilic functional group such as a carboxyl group; Carbonaceous fine particles such as carbon black or graphite having metal oxide particles such as titanium oxide or tin oxide and a hydrophilic group such as a hydroxyl group or a carboxyl group are used.

The fineness of the acrylic fiber to be used in the present invention is preferably 0.3 dtex or more, and more preferably 0.5 dtex or more. Further, the upper limit is preferably 3.3 dtex or less, more preferably 2.5 dtex or less, and more preferably 1.0 dtex or less. When the fineness is in such a range, it is possible to obtain a liquid-repellent non-woven fabric excellent in hand feeling; for example, it can be suitably used for a mask or the like. Moreover, it is also preferable from the point that the liquid retention rate measured by the suspension method and the liquid retention rate after centrifugal dehydration are easily fall within the above range. On the other hand, when the fineness is less than 0.3 dtex, there is a fear that the workability in the form of non-woven fabric deteriorates, which is not preferable. In addition, when the fineness is more than 3.3 dtex, the texture of the liquid-repellent non-woven fabric is deteriorated, and the liquid is not sufficiently retained in the nonwoven fabric during liquid absorption, which is not preferable.

Further, in the acrylic fiber to be used in the present invention, the upper limit of the fiber length divided by the aspect ratio of the fiber diameter is preferably 1,000 or more, more preferably 1300 or more, and the lower limit is preferably 6,000 or less. The better is to meet the following 5000. In the case where the aspect ratio is less than 1000, the fibers are detached from the non-woven fabric, and the hairiness is likely to increase. Moreover, when the aspect ratio is more than 6,000, the possibility of dry-tone equivalent electric power (NEP) is likely to occur at the time of non-woven processing.

Further, the shape of the fiber cross section of the acrylic fiber to be used in the present invention is preferably a circular shape. When the cross-sectional shape of the fiber is circular, since the surface area of the fiber is small, it is difficult to shield light. Therefore, the transparency of the liquid-repellent non-woven fabric of the present invention is improved, and a preferable appearance is easily obtained. Therefore, in the present invention, the circular shape does not need to be a true circle; the ratio of the long axis length to the short axis length may be an elliptical shape of about 1.0 to 1.2. On the other hand, when the cross-sectional shape of the fiber is a broad bean type or a flat type, the chaotic reflection tends to increase and the transparency tends to decrease.

Further, the acrylic fiber to be used in the present invention may be a material having a porous structure. By forming a porous structure, it is possible to easily improve the liquid retention property measured by the suspension method to the upper limit of the above range.

The method for producing the above-mentioned acrylic fiber may be, for example, a solution obtained by dissolving, for example, the above-described acrylonitrile-based polymer in a solvent, as a spinning dope, and the spinning dope in a coagulation bath. Spinning; a known spinning method for stretching, heat treatment, and drying. At that time, the fiber can be made into a porous structure by increasing the temperature of the coagulation bath and changing the heat treatment conditions. Here, the solvent in which the acrylonitrile-based polymer is dissolved may be, for example, an organic solvent such as dimethylformamide, dimethylacetamide or dimethylhydrazine; and nitric acid. An inorganic solvent such as a zincated zinc solution or a sodium thiocyanate aqueous solution. Further, when the other components described above are contained, a spinning dope to which the component has been added may be used.

Moreover, the liquid-repellent nonwoven fabric of the present invention may contain fibers other than the above-described acrylic fibers. Such fibers may, for example, be natural fibers of pulp, cotton, hemp, silk, and wool, recycled fibers of enamel, cupramus, etc., acrylates, polyesters, Synthetic fibers such as polypropylene.

The lower limit of the density of the liquid-repellent non-woven fabric of the present invention is desirably 0.10 g/cm ³ or more, more preferably 0.11 g/cm ³ or more, and the upper limit is preferably 0.20 g/cm ³ or less. More preferably, it is 0.18 g/cm ³ or less. When the density of the non-woven fabric is less than 0.10 g/cm ³ , since the gap between the fibers becomes too wide, the liquid to be sucked becomes easy to flow out; when the non-woven fabric is used as the mask, the liquid becomes easy. The drop of the drip. Moreover, when it exceeds 0.20 g/cm<^3> , since the clearance gap becomes too narrow, the holding amount of liquid may become inadequate.

In the above-described method for producing a liquid-repellent nonwoven fabric of the present invention, after the card is formed into a card using a card or a paper machine, the card web is combined to obtain a non-woven fabric (knitting method, spinning method, sewing). A method (heat bonding method) in which fibers are joined to each other by heat-melting fibers contained in a card web to obtain a nonwoven fabric. Among these, the non-woven hand touch is soft, and from the viewpoint of excellent feeling, it is preferable to obtain a method of non-woven fabric by combining the card webs; among these, a spun lace method is particularly preferable.

Since the liquid-repellent non-woven fabric of the present invention contains a lotion, it can be suitably used as a cosmetic sheet which can be used in various places such as the head, shoulders, and hands. For example, it is also possible to cut out a shape suitable for covering a face and use it as a mask.

The structure of such a mask may be a single layer composed of one piece of the liquid-repellent non-woven fabric of the present invention from the viewpoint of cost; however, it may be a plurality of layers which are laminated together with other non-woven fabrics to form two or more layers. Floor. In this case, it is preferable that the non-woven fabric of the present invention has a structure in which the liquid-repellent non-woven fabric of the present invention is placed on the side contacting the skin, and the polyester non-woven fabric is laminated thereon, and the strength of the non-woven fabric is improved even if it is In the wet state of inhaling the lotion, it is easy to handle the bending and unfolding.
"Embodiment"

In the following, the embodiments are exemplified in order to facilitate the understanding of the present invention; however, they are merely illustrative, and the gist of the present invention is not limited thereto. In addition, the parts and percentages in the examples are expressed on a weight basis unless otherwise specified. The evaluation method of the characteristics in the examples is as follows.

<Preservation rate based on suspension method>
A test piece of 10 cm × 10 cm was taken from the non-woven fabric, and its weight (W1 [g]) was measured in a standard state (20 ° C, relative humidity: 65%). After the test piece was immersed in water for 15 minutes or more, the test piece was taken out from the water and left to stand for 1 minute while being suspended. The weight (W2 [g]) of the test piece was measured, and the liquid retention rate measured by the suspension method was calculated by the following formula.

Fluid retention rate [%] = (W2-W1) / W1 × 100

<Preservation rate after centrifugal dehydration>
A test piece of 10 cm × 10 cm was taken from the non-woven fabric, and its weight (W3 [g]) was measured under standard conditions. After the test piece was immersed in water for 15 minutes or more, the test piece was taken out from the water and attached to the inner wall surface of a centrifugal dehydrator (TYPE H-110C manufactured by TOKYO KOKUSAN ENSHINKI CO., LTD). Dehydration was carried out under the conditions of a centrifugal force of 1207 G and a dehydration time of 1 minute and 30 seconds; the weight of the test piece after dehydration (W4 [g]) was measured; and the liquid retention rate after centrifugal dehydration was calculated by the following formula.

Liquid retention rate after centrifugal dehydration [%] = (W4-W3)/W3 × 100

<Young's modulus at wet>
According to the method described in JISL1015:2010 8.7.2 "Test for Wetting", the wet sample is measured according to JIS L1015:2010 8.11 "Initial tensile resistance", and the calculated initial tensile resistance is used as the Young's modulus when wet.

<denier>
The measurement was carried out by the method of "8.5 fineness" of JISL1015:2010.

<non-woven density>
A test piece of 10 cm × 10 cm was taken from the non-woven fabric, and its weight (W5 [g]) was measured under standard conditions. Further, the thickness of the irregular 10 points on the test piece was measured, and the average thickness (T [cm]) was calculated. The nonwoven fabric density (D [g/cm ³ ]) was calculated from the following formula.

D[ g/cm ³ ]=W5/(10×10×T)

<Transparency of non-woven fabric>
A test piece of 10 cm × 10 cm was taken from the non-woven fabric. The non-woven fabric is immersed in water, and a plate body having characters is described below. The non-woven fabric was observed from the upper portion, and the transparency was evaluated on the basis of the following by the visibility of the characters recorded on the plate.
◎ The text recorded on the board can be clearly confirmed;
○ Although a little embarrassing, it can be confirmed;
× 朦胧 It is difficult to confirm.

[Manufacturing Example 1]
10 parts of a spinning stock solution obtained by dissolving 10 parts of an acrylonitrile-based polymer composed of 90% acrylonitrile and 10% vinyl acetate in 90 parts of 48% aqueous solution of Roden Soda, and spinning and stretching according to a usual method. (full draw ratio: 10 times), dried in a dry bulb/wet bulb = 120 ° C / 60 ° C atmosphere, and then subjected to a wet heat treatment to obtain an acrylic fiber having a single fiber fineness of 0.9 dtex (fiber length) 51 mm).

[Manufacturing Example 2]
In Production Example 1, except that the pore diameter of the spinning nozzle used at the time of spinning was changed, the acrylic fiber (fiber length: 51 mm) having a single fiber fineness of 0.5 dtex was obtained in the same manner.

[Manufacturing Example 3]
In the production example 1, except that the composition of the acrylonitrile-based polymer was changed to 88% of acrylonitrile and 12% of vinyl acetate, the acrylic fiber having a single fiber fineness of 0.9 dtex was obtained in the same manner (fiber length 51). Mm).

[Manufacturing Example 4]
In the production example 1, except that the composition of the acrylonitrile-based polymer was changed to 95% of acrylonitrile and 5% of vinyl acetate, the acrylic fiber having a single fiber fineness of 0.9 dtex (fiber length of 51 mm) was obtained in the same manner. ).

[Examples 1 to 5 and Comparative Examples 1 to 4]
The acrylic fiber of Production Example 1 and other fibers were mixed at a ratio shown in Table 1 to prepare a card web, which was entangled with a water stream to be complexed to have a basis weight of 50 g/m. ² spinning lace non-woven fabric. The evaluation results of the nonwoven fabric are shown in Table 1. In addition, in Table 1, it is described that each fiber of the other fiber is made of yttrium fiber (manufactured by Daiwa Tosoh Co., Ltd., fineness: 1.7 dtex, fiber length: 40 mm), polyester fiber (manufactured by Teijin Frontier Co., Ltd., fineness 1.6). Dtex, fiber length 51 mm).

[Embodiment 6]
A spun lace nonwoven fabric was produced in the same manner as in the case of using the broad bean-type cross-section acrylic fiber (manufactured by Mitsubishi Chemical Corporation, 1 dtex, fiber length: 44 mm) instead of the acrylic fiber of Production Example 1. The evaluation results of the nonwoven fabric are shown in Table 1.

[Examples 7 to 9]
The spun lace nonwoven fabrics of Examples 7 to 9 were produced in the same manner except that the acrylic fibers of Production Examples 2 to 4 were used instead of the acrylic fibers of Production Example 1, respectively. The evaluation results of each of the nonwoven fabrics produced are shown in Table 1.

In the liquid-repellent non-woven fabrics disclosed in Examples 1 to 9, since the liquid retention rate measured by the suspension method and the liquid retention rate after centrifugal dehydration fall within the scope of the present application, the lotion can be sufficiently maintained. Etc., and can be released efficiently. Further, since the transparency is also good and the appearance is excellent, it can be suitably used for a cosmetic sheet such as a mask. On the other hand, in Comparative Examples 1 to 3, since the content of the acrylic fiber was insufficient, the liquid retention rate measured by the suspension method was low, and the liquid retention rate after centrifugal dehydration was high. Therefore, when it is used as a mask or the like, it cannot be said that the retained lotion can be effectively utilized. Further, in Comparative Example 4, since the liquid retention rate after the centrifugal dehydration was too low, it was estimated that it would be dried immediately when it was used as a mask. Further, in all of Comparative Examples 1 to 4, the results of evaluation of transparency were not good.

no.

no.

Claims (7)

A liquid-repellent non-woven fabric characterized in that the content of the acrylic fiber is 30% or more, the liquid retention rate measured by the suspension method is 680 to 2000%, and the liquid retention rate after centrifugal dewatering is 10 to 55%. . The liquid-repellent non-woven fabric according to claim 1, wherein the Young's modulus of the acrylic fiber when wetted is 15 to 80 cN/dtex. The liquid-repellent non-woven fabric according to claim 1 or 2, wherein the acrylic fiber has a fineness of 0.3 to 3.5 dtex. The liquid-repellent non-woven fabric according to any one of claims 1 to 3, wherein the non-woven fabric density is 0.10 to 0.20 g/cm ³ . The liquid-repellent non-woven fabric according to any one of claims 1 to 4, wherein an aspect ratio obtained by dividing a fiber length of the acrylic fiber by a fiber diameter is from 1,000 to 6,000. The liquid-repellent non-woven fabric according to any one of claims 1 to 5, wherein the fiber cross-section of the acrylic fiber is circular. A face mask comprising the liquid-repellent non-woven fabric according to any one of claims 1 to 6.