Non-woven fabric for mask pack excellent in adhesiveness and water retention and method for producing the same

Abstract

The present invention discloses a nonwoven fabric for mask packs that has excellent adhesion and water retention properties, which is obtained by subjecting a cellulose nonwoven fabric to an absorption treatment using an alkaline solution alone or a combination of the alkaline solution and a modifying additive, and then aging the fabric, and a method for producing the same. [Solution] The nonwoven fabric for mask packs according to the present invention includes a surface-modified cellulose nonwoven fabric, and the surface-modified cellulose nonwoven fabric has an adhesion (d2 / d1) of 1.58 or less when measured after immersion in water, and a water retention of 30% or more when measured with a moisture meter (Corneometer CM825), where the water retention is the amount of water absorbed, d1 is the distance between clips that fix the upper end portion of the nonwoven fabric for mask packs, and d2 is the average width length between the middle and lower end portions of the nonwoven fabric for mask packs.

Description

[Technical field]

[0001] The present invention relates to a manufacturing technology for a nonwoven fabric for a mask pack having improved adhesion and water retention properties through a modification reaction using an alkali. [Background technology]

[0002] Nonwoven fabrics used for mask packs are manufactured using the spunlace method, which involves spraying high-pressure water onto the fabric. Nonwoven fabrics manufactured using the spunlace method are generally difficult to distinguish into front and back, left and right, and can be classified into unidirectional and bidirectional nonwoven fabrics depending on the manufacturing process.

[0003] Unidirectional nonwoven fabrics have strength in the mechanical direction, which is the same direction as the machine, so they do not sag in the mechanical direction, but they have the disadvantage of sagging in the perpendicular direction (cross direction).

[0004] When a unidirectional nonwoven fabric is used as a mask pack sheet, it has excellent adhesion, but the pattern becomes distorted due to its tendency to sag in the vertical direction, which is problematic when used as a mask pack. Furthermore, since a mask pack sheet is required to have the property of adhering to the skin and pulling up and tightening the skin as it shrinks in size during use, the sagging can be said to be a very big disadvantage.

[0005] A bidirectional nonwoven fabric is one that more fully compensates for the shortcomings of such a unidirectional nonwoven fabric.

[0006] Bidirectional nonwoven fabrics have the advantage that they are less prone to sagging and do not distort patterns because they are given strength in both the machine direction and the perpendicular direction, but they have the disadvantage that they have low adhesion due to the increased strength given to them in both directions.

[0007] Cellulosic or synthetic fiber nonwoven fabrics are used for mask packs. Synthetic fiber nonwoven fabrics for mask packs include polypropylene, polyester, and polynylon nonwoven fabrics. Cellulosic nonwoven fabrics for mask packs include rayon, lyocell, and pure cotton.

[0008] When synthetic fiber nonwoven fabric is used as a mask pack sheet, it has the disadvantage of low water retention due to the hydrophobicity of synthetic fibers, and low adhesion to the skin, resulting in low ability to deliver the functional active ingredients of the essence, which are equivalent to moisturizing, soothing, and elasticity, to the skin.

[0009] Cellulose fiber is an environmentally friendly polymer that has the same chemical structure as naturally occurring cotton fiber, and is made up of a large number of cellulose unit molecules. Cellulose fiber consists of crystalline and amorphous regions, and when immersed in water, the liquid penetrates the amorphous regions and swells. Due to these properties, mask pack sheets using cellulose fiber are known to have excellent adhesion to the skin and water retention.

[0010] It is known that the lower the weight of these nonwoven fabrics for mask packs, the less the amount of essence absorbed and the better the adhesion to the skin, but the easier it is to loosen. On the other hand, the higher the weight of the nonwoven fabrics for mask packs, the more the amount of essence absorbed and the better the skin lifting effect, but the disadvantage is that the adhesion is not good. As a result, when using nonwoven fabrics for mask packs, there is a problem in that the viscosity of the essence for the mask pack must be increased in order to improve adhesion.

[0011] Therefore, there is a need for research into nonwoven fabrics specifically for mask packs that not only have excellent adhesion but also have excellent water retention properties, regardless of the viscosity of the essence. Summary of the Invention [Problem to be solved by the invention]

[0012] An object of the present invention is to provide a nonwoven fabric for mask packs, which has a synergistic effect of a rate of change in adhesion of 20% or more and a rate of change in water retention of 40% or more compared to before the reaction.

[0013] Another object of the present invention is to provide a method for producing a nonwoven fabric for a mask pack that can be mass-produced.

[0014] The object of the present invention is not limited to the object mentioned above, and other objects and advantages of the present invention not mentioned can be understood from the following description and can be more clearly understood from the embodiments of the present invention. Also, it will be easily understood that the object and advantages of the present invention can be realized by the means and combinations thereof as set forth in the claims. [Means for solving the problem]

[0015] The nonwoven fabric for mask packs according to the present invention includes a surface-modified cellulose nonwoven fabric, and the surface-modified cellulose nonwoven fabric has an adhesion (d2 / d1) of 1.58 or less when measured by immersion in water, and a water retention of 30% or more when measured by a moisture meter (Corneometer CM825), where the water retention is the amount of water absorbed, d1 is the distance between clips fixing the upper end portion of the nonwoven fabric for mask packs, and d2 is the average width length between the middle and lower end portions of the nonwoven fabric for mask packs.

[0016] The method for producing a nonwoven fabric for a mask pack according to the present invention includes a step of subjecting a cellulose nonwoven fabric to an absorption treatment using an alkaline solution alone or in combination with a modifying additive, followed by aging, and the rate of change in water retention is 40% or more and the rate of change in adhesion is 20% or more.

[0017] The method for producing a nonwoven fabric for a mask pack according to the present invention includes the steps of (a) subjecting a cellulose nonwoven fabric to an absorption treatment using an alkaline solution alone or in combination with a modifying additive, (b) maturing the absorbed cellulose nonwoven fabric to surface-modify the cellulose nonwoven fabric, (c) neutralizing the surface-modified cellulose nonwoven fabric, and (d) drying the neutralized cellulose nonwoven fabric to produce a nonwoven fabric for a mask pack. Effect of the Invention

[0018] The nonwoven fabric for mask packs according to the present invention is produced by subjecting a cellulose nonwoven fabric to an absorption treatment using an alkaline solution alone or a combination of an alkaline solution and a modifying additive, followed by aging, thereby exhibiting excellent adhesion and water retention.

[0019] In particular, the degree of swelling, water retention and adhesion can be adjusted according to the type of nonwoven fabric, the concentration of the alkaline solution, the type of modifying additive and the aging temperature.

[0020] In addition, the nonwoven fabric for mask packs has the effect of being capable of being mass-produced in a continuous process.

[0021] The above-mentioned effects and specific effects of the present invention will be described together with the following description of the preferred embodiments of the present invention. [Brief description of the drawings]

[0022] [Figure 1] 1 is a flowchart showing a method for producing a nonwoven fabric for a mask pack using a continuous process of the present invention. [Diagram 2] 1 is a photograph showing raw paper and reactive paper according to Example 1 of the present invention. [Diagram 3] 1 is a photograph showing raw paper and reactive paper according to Example 3 of the present invention. [Figure 4] 1 is a photograph showing raw paper and reactive paper according to Example 6 of the present invention. [Diagram 5] 1 is a photograph showing raw paper according to Comparative Examples 1 to 4 of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] The above-mentioned objects, features and advantages will be described in detail below with reference to the accompanying drawings, so that a person having ordinary skill in the art to which the present invention pertains can easily implement the technical idea of ​​the present invention. In describing the present invention, if a detailed description of a known technology according to the present invention is deemed to make the gist of the present invention unclear, the detailed description will be omitted. Hereinafter, a preferred embodiment according to the present invention will be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings are used to indicate the same or similar components.

[0024] Hereinafter, when an arbitrary structure is arranged on the "top (or bottom)" of a component or "above (or below)" a component, it means that the arbitrary structure is not only arranged in contact with the upper surface (or lower surface) of the component, but also that other structures may be interposed between the component and the arbitrary structure arranged on (or below) the component.

[0025] Furthermore, when a component is described as being "coupled," "coupled," or "connected" to another component, it should be understood that the components may be directly coupled or connected to each other, but that there may be other components "intervening" between each component, or each component may be "coupled," "coupled," or "connected" via other components.

[0026] Hereinafter, a nonwoven fabric for a mask pack having excellent adhesion and water retention properties and a method for manufacturing the same according to several embodiments of the present invention will be described.

[0027] The nonwoven fabric for mask packs according to the present invention has the effect of ensuring improved adhesion and water retention by subjecting a cellulose nonwoven fabric to an absorption treatment using an alkaline solution alone or a combination of an alkaline solution and a modifying additive through a continuous process, modifying the fabric at room temperature or at a high temperature, and then aging the fabric.

[0028] The term "water retention" in the present invention is an index showing the ability to absorb moisture and essence when manufacturing a mask pack. Since water retention is an important evaluation method for the fabric of a mask pack, it is used as a unique evaluation index.

[0029] When the nonwoven fabric for mask packs is soaked in water or essence ingredients and then taken out, the amount that the reactive paper can absorb, that is, the amount of water it can absorb (water retention), varies depending on the raw paper.

[0030] The better the moisture retention, the more moisture and essence it can absorb and then deliver to the skin.

[0031] In the present invention, the cellulose nonwoven fabric before surface modification corresponds to raw paper, and the cellulose nonwoven fabric after surface modification corresponds to reactive paper.

[0032] The continuous process according to the present invention is a method in which the reaction or operation of raw materials is carried out continuously. The continuous process has the advantages of short processing time, low process costs due to the circulation of chemicals, high production efficiency, and being suitable for mass production.

[0033] However, in a continuous process, differences in physical properties can occur between the first and last parts of the raw paper, and deviations can also occur between the left and right sides, so the key technology is to maintain a consistent level of quality.

[0034] The method for producing the nonwoven fabric for mask packs according to the present invention includes a step of subjecting the cellulose nonwoven fabric to an absorption treatment using an alkaline solution alone or in combination with a modifying additive, followed by aging, whereby the nonwoven fabric for mask packs shows a water retention change rate of 40% or more and an adhesion change rate of 20% or more.

[0035] FIG. 1 is a flow chart showing a method for producing a nonwoven fabric for a mask pack using a continuous process according to the present invention.

[0036] Referring to FIG. 1, the method for producing a nonwoven fabric for a mask pack of the present invention includes a step (S210) of absorbing an alkaline solution into a cellulose nonwoven fabric, either alone or in combination with an alkaline solution and a modifying additive, a step (S220) of maturing the nonwoven fabric to modify its surface, a step (S230) of neutralizing the nonwoven fabric, and a step (S240) of drying the nonwoven fabric for a mask pack.

[0037] First, the cellulose nonwoven fabric is subjected to an absorption treatment using an alkaline solution alone or a combination of the alkaline solution and a modifying additive.

[0038] The absorption step can be carried out by immersing the cellulose nonwoven fabric in an alkaline solution alone or in a mixture of an alkaline solution and a modifying additive, or by spraying the cellulose nonwoven fabric with an alkaline solution alone or in a mixture of an alkaline solution and a modifying additive.

[0039] When cellulose nonwoven fabric is absorbed and treated with an alkaline solution, the hydrogen bonds between the fibers in the cellulose nonwoven fabric are dissociated by the alkali, and some of the cellulose molecules react with the alkali to form alkali-cellulose type polymerization, allowing the fiber molecules to move more freely.

[0040] As a result, the cellulose nonwoven fabric swells, and the degree of swelling can be adjusted by adjusting the aging conditions described below.

[0041] The cellulose nonwoven fabric refers to natural cellulose fibers having 200 to 5000 repeating units. If the repeating units are less than 200, the fiber strength decreases, making it difficult to maintain the sheet shape. Conversely, if the repeating units are more than 5000, dissociation of hydroxyl groups by alkali becomes weak, making surface modification difficult.

[0042] As the nonwoven fabric, it is preferable to use a nonwoven fabric containing regenerated cellulose.

[0043] The nonwoven fabric containing regenerated cellulose is generated by regenerating and depositing cellulose derivatives such as cellulose esters and cellulose ethers, and cellulose additive compounds such as alkali cellulose.

[0044] For example, the regenerated cellulose nonwoven fabric may include one or more of rayon, lyocell, cupro, modal, and pulp.

[0045] Cellulose nonwoven fabrics as raw materials for nonwoven fabrics for mask packs have unidirectional or bidirectional properties and are 20 to 100 g / m 2 Preferably, the cellulose nonwoven fabric has a weight of 30 to 90 g / m 2 and more preferably has a weight of 30 to 80 g / m 2 The weight of the sintered body may be 1.0 to 1.0 kg.

[0046] Bidirectional nonwoven fabrics have strength in both the machine direction and the perpendicular direction, which reduces sagging and prevents distortion of patterns.

[0047] The raw material for the above cellulose nonwoven fabric is 20 to 100 g / m 2 By satisfying the above weight limits, the alkali reaction and the modification reaction can be carried out appropriately.

[0048] The alkaline solution absorbed into the cellulose nonwoven raw paper may have a concentration of 5 to 40%, and preferably has a concentration of 10 to 40%.

[0049] Furthermore, the dilution ratio will vary depending on the concentration of the alkaline solution used.

[0050] The alkaline solution can be a mixture of one or more highly alkaline chemical substances such as sodium hydroxide (NaOH), potassium hydroxide (KOH), aqueous ammonia (NH4OH), and trimethyl ammonium hydroxide.

[0051] Of these, it is preferable to use sodium hydroxide and / or potassium hydroxide as the alkaline solution, since these have the advantage of being economical to use, are free from problems such as gas inhalation, and are easy to handle from an environmental perspective.

[0052] If the concentration of the alkaline solution is less than 5%, the desired surface modification is difficult to obtain due to the low alkalinity, whereas if it exceeds 40%, it may be difficult to adjust the swelling degree of the cellulose nonwoven fabric, and thus the water retention and adhesion.

[0053] In the step of subjecting the cellulose nonwoven fabric to an absorption treatment, an alkaline solution and a modifying additive can be added in combination.

[0054] Alternatively, in the step of subjecting the cellulose nonwoven fabric to an absorption treatment, the alkaline solution may be added first, and then the modifying additive may be added after the squeezing treatment described below.

[0055] The above-mentioned property modifying additives can be added to dissociate or rearrange some of the intrafiber bonds to improve adhesion.

[0056] The modifying additive is an additive for modifying the surface of the nonwoven fabric, and may include one or more of hydrogen peroxide, sodium percarbonate, sodium persulfate, potassium persulfate, ammonium persulfate, sodium chlorite, sodium hypochlorite, sodium hydrosulfite, sodium thiosulfate, and sodium metabisulfite.

[0057] These modifying additives each have their own oxidation-reduction potential, and the degree of modification of the nonwoven fabric varies depending on the magnitude of the potential difference, thereby inducing changes in the physical properties of the nonwoven fabric.

[0058] It is preferable to use the modification additive after considering the raw paper's material, thickness, strength, elongation, and other physical properties. A more effective modification reaction occurs when an alkaline solution is used in combination with the modification additive. However, it is preferable to use the modification additive in the minimum amount.

[0059] The modifying additive can be added at about 0.5 to 20% by weight, preferably about 1 to 5% by weight, more preferably 1 to 2% by weight, based on a total of 100% by weight of the alkaline solution and the modifying additive.

[0060] If the amount added is less than 0.5% by weight, it is difficult to obtain the desired surface modification effect, whereas if the amount added is more than 20% by weight, the raw paper may become embrittled.

[0061] If these property-modifying additives remain in the final product, the nonwoven fabric, side effects such as skin irritation may occur.

[0062] Therefore, the modifying additive must act only in the modifying step, and must be completely removed in the subsequent steps of neutralization and washing.

[0063] After the step of absorbing the cellulose nonwoven fabric, a squeezing step can be performed.

[0064] The squeezing process means squeezing, and can be carried out to reduce the moisture deviation in the nonwoven fabric and to make the nonwoven fabric uniform in shape.

[0065] The cellulose nonwoven fabric is squeezed as it passes through two rollers with an adjusted pressure. When the squeezing is done, only the desired amount of alkaline solution is retained on the cellulose nonwoven fabric, and the remaining amount is removed.

[0066] Thus, squeezing is a very important step which determines the amount of alkaline solution remaining on the cellulose nonwoven fabric.

[0067] Squeezing determines the pick-up rate (%) of the nonwoven fabric by adjusting the pressure between the rollers.

[0068] The pickup rate (%) is the weight of the cellulose nonwoven fabric absorbed by the alkaline solution expressed as a ratio to the weight of the nonwoven raw paper.

[0069] That is, the pickup rate (%) is {(weight of wet nonwoven fabric-weight of raw paper) / weight of raw paper}×100%.

[0070] The cellulose nonwoven fabric is preferably compressed so that the pick-up rate is 200 to 500%, more preferably 200 to 400%, and even more preferably 200 to 300%.

[0071] If the pickup rate is less than 200%, the hydrogen bonds of the cellulose molecules may not be sufficiently dissociated, whereas if the pickup rate is more than 500%, the hydrogen bonds of the cellulose molecules may be excessively dissociated, resulting in loss of the drug and making it difficult to maintain the shape of the nonwoven fabric.

[0072] The cellulose nonwoven fabric is then aged to modify the surface of the cellulose nonwoven fabric.

[0073] The pressed cellulose nonwoven fabric is in a state where it has absorbed the appropriate amount of the alkaline solution and / or the modifying additive.

[0074] When a cellulose nonwoven fabric is absorbed in an alkaline solution and then aged, the hydrogen bonds between the cellulose molecules in the cellulose nonwoven fabric are dissociated, and some of the cellulose molecules react with the alkali, resulting in alkali-cellulose polymerization.

[0075] This allows the polymerized cellulose molecules to move more freely.

[0076] As a result, the alkaline solution and water molecules can easily penetrate between the cellulose molecules, and swelling occurs. Although many cellulose molecules gather together to form cellulose fibers, the length of the main chain of the cellulose fibers does not change, and the cellulose fibers swell in the radial direction, changing the physical properties of the raw paper.

[0077] The degree of swelling is greatly influenced by the fiber material, the concentration of the alkaline solution, and the aging temperature.

[0078] As the cross section of the swollen cellulose fiber becomes more circular, intermolecular rearrangement occurs between the crystalline and non-crystalline regions of the molecule, and the alkaline solution hydrolyzes some of the glycosidic bonds in the cellulose nonwoven fabric.

[0079] This modification reaction reduces the bonding strength within the cellulose molecules, causing loosening, resulting in a decrease in strength. In addition, the degree of swelling creates more free space within the cellulose molecules, increasing the amount of water that can be absorbed (water retention). Furthermore, the rearrangement of the cellulose molecular bonds improves the adhesion of the nonwoven fabric, and water retention is also increased. The degree of polymerization (DP) of the cellulose molecules of the reacted paper may be smaller than that of the raw paper.

[0080] In this regard, the change in water retention of the cellulose nonwoven fabric after surface modification in the maturation step relative to the water retention of raw paper can be 40% or more.

[0081] After surface modification, the water retention capacity of the cellulose nonwoven fabric, i.e. the amount it can absorb, increases.

[0082] The cellulose nonwoven fabric after surface modification, and the finally produced nonwoven fabric for mask packs, may have a water retention of 30% or more as measured with a moisture meter (Corneometer CM825). Preferably, the water retention of the cellulose nonwoven fabric after surface modification may be 32 to 90%, and more preferably 36 to 74%.

[0083] For example, when the water retention of the cellulose nonwoven fabric of the raw paper is 12% and the water retention of the cellulose nonwoven fabric of the reactive paper is 36%, the rate of change in water retention is approximately 200%.

[0084] Furthermore, when the water retention of the cellulose nonwoven fabric of the raw paper is 52% and the water retention of the cellulose nonwoven fabric of the reactive paper is 74%, the rate of change in water retention is approximately 42%.

[0085] When the raw paper weight is low, the amount of moisture that can be contained is particularly small, so the change in water retention is shown to be large, up to 200%.

[0086] Conversely, as the weight of the raw paper increases, the amount of moisture that the raw paper itself can absorb increases, and the rate of change in water retention decreases relatively.

[0087] Based on the weight of 80g of nonwoven fabric normally used for mask packs, the water retention rate changed by at least 40% after modification.

[0088] In this way, the rate of change in water retention of the surface-modified cellulose nonwoven fabric may be 42 to 200% based on the water retention of the cellulose nonwoven fabric before surface modification.

[0089] Furthermore, the cellulose nonwoven fabric after the surface modification in the maturation step, and the finally produced nonwoven fabric for a mask pack, may have an adhesive strength (d2 / d1) of 1.58 or less, preferably 1.00 to 1.56, and more preferably 1.22 to 1.54.

[0090] Here, d1 is the distance between the clips that secure the upper end portion of the nonwoven fabric for the mask pack.

[0091] d2 is the average width between the middle and lower end parts of the nonwoven fabric for a mask pack.

[0092] The above d1 and d2 are as shown in FIG.

[0093] The adhesion was measured by immersion in water, and will be described later in the measurement method of the experimental examples.

[0094] In order to sufficiently dissociate hydrogen bonds in cellulose molecules, the aging is preferably carried out at −10 to 100° C. for 1 to 100 minutes, and more preferably at 10 to 80° C. for 1 to 20 minutes.

[0095] If the aging temperature is lower than -10°C, the degree of modification will be low. Conversely, if the aging temperature is higher than 100°C, excessive reaction will occur, which may cause embrittlement of the fiber.

[0096] The maturation time must also be adjusted. The maturation time varies depending on the type of modifying additive, the blending ratio, the pick-up rate, the maturation temperature, and the characteristics of the equipment, so it is preferable to measure the modification reaction of the final nonwoven fabric and satisfy the range of 1 to 100 minutes.

[0097] In this way, the range of aging temperature and time can be adjusted depending on the physical properties of the raw paper, the alkali concentration, and the type and amount of the modifying additive.

[0098] After the step of maturing and surface modifying the cellulose nonwoven fabric, a squeezing process can be carried out.

[0099] The pressing process removes excess alkaline solution and minimal residual amounts of modifying additives.

[0100] The matters relating to the compression treatment are as described above.

[0101] The surface-modified cellulose nonwoven fabric is then neutralized to a neutral pH before being dried.

[0102] Specifically, the surface-modified cellulose nonwoven fabric can be neutralized to a pH of about 7 to 8 by transferring the surface-modified cellulose nonwoven fabric to a neutralization tank and adding an acid solution.

[0103] During the neutralization, the acid introduced must be completely consumed in the reaction, and no acid or alkali must remain on the nonwoven fabric.

[0104] In order to adjust the pH of the surface-modified cellulose nonwoven fabric, it can be neutralized with an acid solution containing one or more of sulfuric acid, phosphoric acid, hydrochloric acid, formic acid, acetic acid, and glacial acetic acid.

[0105] In this case, the concentration of the acid solution may be about 0.1 to 20%, preferably 1 to 10%, and more preferably 1 to 2%. The neutralization reaction can be carried out sufficiently within the acid solution concentration range.

[0106] After the step of neutralizing the cellulose nonwoven fabric, it may be subjected to a squeezing process.

[0107] The pressing process has the advantage that excess moisture can be removed, making the drying process easier.

[0108] Next, the neutralized cellulose nonwoven fabric is dried by a heat treatment method to produce a nonwoven fabric for a mask pack.

[0109] Specifically, the cellulose nonwoven fabric neutralized with the acid solution is pressed again to minimize the amount of residual moisture, and then thermally dried at 80 to 170° C. to produce a nonwoven fabric for a mask pack. Preferably, thermal drying can be performed at 100 to 150° C.

[0110] The hot air treatment dries the nonwoven fabric for the mask pack and simultaneously fixes its shape.

[0111] If the drying temperature is less than 80° C., the mask pack sheet product may not be dried sufficiently. Conversely, if the drying temperature exceeds 170° C., the temperature becomes too high and yellowing of the nonwoven fabric for the mask pack may occur.

[0112] The nonwoven fabric for mask packs manufactured may be sold soaked in a solution containing a component exhibiting one or more skin-improving functionalities among moisturizing, soothing, elasticity, wrinkle improvement, and whitening. The nonwoven fabric for mask packs soaked in the solution can provide the user with one or more functional effects of moisturizing, soothing, elasticity, wrinkle improvement, and whitening.

[0113] Thus, the nonwoven fabric for mask packs produced by the continuous process of the present invention includes a surface-modified cellulose nonwoven fabric, which can exhibit an adhesion strength (d2 / d1) of 1.58 or less when measured by immersion in water.

[0114] The water retention measured by a moisture meter (Moisture Determinate Balance FD-660) may be 30% or more.

[0115] The nonwoven fabric for mask packs produced by the present invention may have a change rate of water retention of the surface-modified cellulose nonwoven fabric of 40% or more compared to the water retention of the cellulose nonwoven fabric before surface modification.

[0116] Furthermore, the rate of change in adhesion of the surface-modified cellulose nonwoven fabric compared to the adhesion of the cellulose nonwoven fabric before surface modification may be 22 to 40%, preferably 24 to 38%, and more preferably 25 to 34%.

[0117] The rate of change in adhesion can be calculated by {(adhesion strength of reactive paper - adhesion strength of raw paper) / adhesion strength of raw paper} x 100%.

[0118] Specific examples of the nonwoven fabric for mask packs having excellent adhesion and water retention properties and the method for producing the same are as follows.

[0119] 1. Manufacturing of nonwoven fabric for mask packs Example 1 Fabric weight 30g / m 2 The lyocell nonwoven fabric was treated with a 50% NaOH solution diluted to 10% by spraying method.

[0120] Next, pressing is carried out so that the final pick-up rate is 200%.

[0121] Next, after undergoing a 5-minute aging process in an aging box at 10° C., the pieces were immersed in a 2% glacial acetic acid solution to neutralize the pH.

[0122] Next, the fabric was passed through a hot air drying oven at 150° C. to produce a nonwoven fabric for a mask pack.

[0123] The raw paper showed a tensile strength (M / C) of 8 / 9, elongation (M / C) of 35 / 40, water retention of 12%, average adhesion (d2) of 11.0, and adhesion (d2 / d1) of 1.83.

[0124] Example 2 Fabric weight is 40g / m 2 A nonwoven fabric for mask packs was produced under the same conditions as in Example 1, except that a bamboo nonwoven fabric was used, the raw nonwoven fabric was immersed in a 10% diluted alkaline solution, and a 5-minute aging process was performed in an aging box at 20°C.

[0125] The raw paper showed a tensile strength (M / C) of 6 / 7, elongation (M / C) of 40 / 55, water retention of 28%, average adhesion (d2) of 10.6, and adhesion (d2 / d1) of 1.76.

[0126] Example 3 Fabric weight 50g / m 2The bamboo nonwoven fabric was soaked in a 10% diluted alkaline solution so that the pickup rate was 300%, and then pressed.

[0127] Next, the raw nonwoven fabric that had been squeegeeed was immersed in 2% by weight (addition amount) of hydrogen peroxide, and then squeezed.

[0128] Next, after undergoing a 10-minute aging process in an aging box at 30° C., the pieces were immersed in a 2% glacial acetic acid solution to neutralize the pH.

[0129] Next, the fabric was passed through a hot air drying oven at 150° C. to produce a nonwoven fabric for a mask pack.

[0130] The raw paper showed a tensile strength (M / C) of 8 / 6, elongation (M / C) of 25 / 50, water retention of 32%, average adhesion (d2) of 11.2, and adhesion (d2 / d1) of 1.87.

[0131] Example 4 Fabric weight 60g / m 2 A nonwoven fabric for mask packs was manufactured under the same conditions as in Example 3, except that a bamboo nonwoven fabric was used, a 20% diluted alkaline solution was sprayed onto the nonwoven fabric, 1% sodium hypochlorite was sprayed, and a 10-minute aging process was performed in an aging box at 40°C.

[0132] The raw paper showed a tensile strength (M / C) of 10 / 15, elongation (M / C) of 40 / 43, water retention of 48%, average adhesion (d2) of 12.2, and adhesion (d2 / d1) of 2.03.

[0133] Example 5 Fabric weight 70g / m 2A nonwoven fabric for a mask pack was manufactured under the same conditions as in Example 3, except that a lyocell nonwoven fabric was used, the nonwoven fabric was soaked in a 30% diluted alkaline solution, the nonwoven fabric was soaked in 2% sodium thiosulfate, and the nonwoven fabric was subjected to a 10-minute aging process in an aging box at 60°C.

[0134] The raw paper showed a tensile strength (M / C) of 13 / 20, elongation (M / C) of 36 / 40, water retention of 50%, average adhesion (d2) of 13.6, and adhesion (d2 / d1) of 2.27.

[0135] Example 6 Fabric weight 80g / m 2 A nonwoven fabric for mask packs was manufactured under the same conditions as in Example 3, except that a lyocell nonwoven fabric was used, the nonwoven fabric was soaked in a 40% alkaline dilution, the nonwoven fabric was soaked in 2% sodium hydrosulfite, and the nonwoven fabric was subjected to a maturation process for 20 minutes in an aging box at 80°C.

[0136] The raw paper showed a tensile strength (M / C) of 15 / 20, elongation (M / C) of 33 / 45, water retention of 52%, average adhesion (d2) of 14.0, and adhesion (d2 / d1) of 2.33.

[0137] 2. Measurement of physical properties and results 1) The physical properties of the nonwoven fabrics (reactive papers) produced in Examples 1 to 6 and Comparative Examples 1 to 4 are described in (1) to (10).

[0138] 2) Tensile strength and elongation: Measured by the UTM method according to KS K ISO 9073-3, and reported as MD / CD.

[0139] 3) Water retention (%): After a test fabric of (50*50)±1mm size was allowed to absorb 5 times the mass of liquid, the water retention was measured at 35℃ using a moisture meter (Moisture Determinate Balance FD-660).

[0140] 4) Change in water retention (%): Calculated as {(water retention of reactive paper - water retention of raw paper) / water retention of raw paper} x 100%.

[0141] 5) Adhesion: First, a nonwoven fabric sample measuring 30 x 30 cm is prepared. The nonwoven fabric sample is fixed with clips at points 3 cm to the left and right of the center of the top end (the distance between the clips is called d1). In this fixed state, each nonwoven fabric sample is immersed in water for 1 minute. After lifting the nonwoven fabric sample vertically, the length of the middle left and right widths of the nonwoven fabric sample and the length of the bottom left and right widths of the nonwoven fabric sample are measured to obtain the average value (d2).

[0142] The adhesion strength is calculated by d2 / d1, and the smaller the adhesion strength value, the better the adhesion is evaluated.

[0143] 6) Rate of change in adhesion (adhesion force): Calculated as {(adhesion force of reactive paper - adhesion force of raw paper) / adhesion force of raw paper} x 100%.

[0144] (1) Physical properties of the nonwoven fabric produced in Example 1 The nonwoven fabric for mask packs produced had a tensile strength (M / C) of 7 / 8, an elongation rate (M / C) of 20 / 40, a water retention rate of 36%, an average adhesion strength (d2) of 8.0, and an adhesion strength (d2 / d1) of 1.33.

[0145] The rate of change in water retention increased by 200%, and the rate of change in adhesion increased by 28%.

[0146] (2) Physical properties of the nonwoven fabric produced in Example 2 The nonwoven fabric for mask packs produced had a tensile strength (M / C) of 6 / 5, an elongation rate (M / C) of 25 / 40, a water retention rate of 57%, an average adhesion strength (d2) of 7.3, and an adhesion strength (d2 / d1) of 1.22.

[0147] The rate of change in water retention increased by 104%, and the rate of change in adhesion increased by 30%.

[0148] (3) Physical properties of the nonwoven fabric produced in Example 3 The nonwoven fabric for mask packs produced had a tensile strength (M / C) of 9 / 7, an elongation rate (M / C) of 20 / 40, a water retention rate of 68%, an average adhesion strength (d2) of 8.4, and an adhesion strength (d2 / d1) of 1.40.

[0149] The rate of change in water retention increased by 113%, and the rate of change in adhesion increased by 25%.

[0150] (4) Physical properties of the nonwoven fabric produced in Example 4 The nonwoven fabric for mask packs produced had a tensile strength (M / C) of 10 / 9, an elongation rate (M / C) of 25 / 37, a water retention rate of 71%, an average adhesion strength (d2) of 8.7, and an adhesion strength (d2 / d1) of 1.44.

[0151] The rate of change in water retention increased by 48%, and the rate of change in adhesion increased by 29%.

[0152] (5) Physical properties of the nonwoven fabric produced in Example 5 The nonwoven fabric for mask packs produced had a tensile strength (M / C) of 11 / 13, an elongation rate (M / C) of 23 / 35, a water retention rate of 72%, an average adhesion strength (d2) of 9.1, and an adhesion strength (d2 / d1) of 1.52.

[0153] The rate of change in water retention increased by 44%, and the rate of change in adhesion increased by 33%.

[0154] (6) Physical properties of the nonwoven fabric produced in Example 6 The nonwoven fabric for mask packs produced had a tensile strength (M / C) of 11 / 10, an elongation rate (M / C) of 20 / 35, a water retention rate of 74%, an average adhesion strength (d2) of 9.3, and an adhesion strength (d2 / d1) of 1.54.

[0155] The rate of change in water retention increased by 42%, and the rate of change in adhesion increased by 34%.

[0156] (7) Physical properties of nonwoven fabric of Comparative Example 1 It is made of Asahi Kasei's cupra fabric.

[0157] The water retention of the nonwoven fabric was 47%, the average adhesion (d2) was 10.3, and the adhesion (d2 / d1) was 1.72.

[0158] (8) Physical properties of nonwoven fabric of Comparative Example 2 It is made of Asahi Kasei's cupra fabric.

[0159] The water retention of the nonwoven fabric was 51%, the average adhesion (d2) was 10.5, and the adhesion (d2 / d1) was 1.75.

[0160] (9) Physical properties of nonwoven fabric of Comparative Example 3 This is a lyocell fabric made by Haolin, a Chinese company.

[0161] The water retention of the nonwoven fabric was 12%, the average adhesion (d2) was 11.0, and the adhesion (d2 / d1) was 1.83.

[0162] (10) Physical properties of nonwoven fabric of Comparative Example 4 This is a lyocell fabric made by Haolin, a Chinese company.

[0163] The water retention of the nonwoven fabric was 19%, the average adhesion (d2) was 10.9, and the adhesion (d2 / d1) was 1.81.

[0164] FIG. 2 is a photograph showing raw paper and reactive paper according to Example 1 of the present invention.

[0165] As shown in FIG. 2, the nonwoven fabric for mask packs according to Example 1 was measured to have an adhesion (d2 / d1) to raw paper of 11.0 cm÷distance between clips (d1)=1.83.

[0166] On the other hand, after aging in an alkaline solution, neutralization, and heat drying, the adhesion strength (d2 / d1) of the reactive paper was measured to be 8.0 cm ÷ clip distance (d1) = 1.33.

[0167] The nonwoven fabric for mask packs in Example 1 has an adhesion of 1.58 or less, and the degree of polymerization of the cellulose molecules of the reactive paper is smaller than the degree of polymerization of the cellulose molecules of the raw paper, demonstrating superior water retention.

[0168] FIG. 3 is a photograph showing raw paper and reactive paper according to Example 3 of the present invention.

[0169] As shown in FIG. 3, the nonwoven fabric for mask packs according to Example 3 had an adhesion (d2 / d1) to raw paper of 11.2 cm÷distance between clips (d1)=1.87.

[0170] On the other hand, after aging in an alkaline solution, neutralization, and heat drying, the adhesion strength (d2 / d1) of the reactive paper was measured to be 8.4 cm÷clip distance (d1)=1.40.

[0171] The nonwoven fabric for mask packs of Example 3 has an adhesion of 1.58 or less, and the degree of polymerization of the cellulose molecules of the reactive paper is smaller than the degree of polymerization of the cellulose molecules of the raw paper, demonstrating superior water retention.

[0172] FIG. 4 is a photograph showing raw paper and reactive paper according to Example 6 of the present invention.

[0173] As shown in FIG. 4, the nonwoven fabric for mask packs according to Example 6 was measured to have an adhesion (d2 / d1) to raw paper of 14.0 cm÷clip distance (d1)=2.33.

[0174] On the other hand, after aging in an alkaline solution, neutralization, and heat drying, the adhesive strength (d2 / d1) of the reactive paper was measured to be 9.3 cm ÷ clip distance (d1) = 1.54. The nonwoven fabric for mask packs of Example 6 satisfies the adhesive strength of 1.58 or less, and the degree of polymerization of the cellulose molecules of the reactive paper is smaller than that of the raw paper, indicating that the water retention is superior.

[0175] FIG. 5 is a photograph showing foreign products related to Comparative Examples 1 to 4 of the present invention.

[0176] As shown in FIG. 5, the adhesive strength (d2 / d1) of the nonwoven fabrics for mask packs according to Comparative Examples 1 to 4 was measured to be 1.70 or more.

[0177] In comparison, the water retention and adhesion of the nonwoven fabrics for mask packs produced in Examples 1 to 6 are more improved than those of the nonwoven fabrics for mask packs produced in Comparative Examples 1 to 4.

[0178] Therefore, the nonwoven fabric for mask packs according to the present invention is produced in a continuous process of aging in an alkaline solution, neutralization, and heat drying, and thus has the effect of simultaneously ensuring adhesion and water retention without using epichlorohydrin.

[0179] Although the present invention has been described above with reference to the illustrative drawings, the present invention is not limited to the embodiments and drawings disclosed in this specification, and it is obvious that various modifications can be made by those skilled in the art within the scope of the technical concept of the present invention. Furthermore, even if the effects of the configuration of the present invention are not explicitly described and explained while describing the embodiments of the present invention, it is natural that the effects that can be predicted by the configuration should also be recognized.

Claims

1. A surface-modified cellulose nonwoven fabric is included, The surface-modified cellulose nonwoven fabric is Adhesion strength measured by immersion in water (d ２ / d １ ) is 1.58 or less, The water retention measured by a moisture meter (Corneometer CM825) is 30% or more, Here, the water retention is the amount of water absorbed, and d １ is the distance between the clips that secure the upper end of the nonwoven fabric for the mask pack, and d ２ is the average width length between the middle part and the lower end part of the nonwoven fabric for mask packs; Nonwoven fabric for mask packs.

2. 2. The nonwoven fabric for mask packs according to claim 1, wherein a rate of change in water retention of the surface-modified cellulose nonwoven fabric is 40% or more compared to the water retention of the cellulose nonwoven fabric before the surface modification.

3. The method includes the steps of absorbing an alkaline solution into a cellulose nonwoven fabric, or absorbing the alkaline solution and a modifying additive in combination, and then aging the cellulose nonwoven fabric; A method for producing a nonwoven fabric for a mask pack, in which the rate of change in water retention is 40% or more and the rate of change in adhesion is 20% or more.

4. (a) subjecting a cellulose nonwoven fabric to an absorption treatment using an alkaline solution alone or in combination with a modifying additive; (b) maturing the absorbed cellulose nonwoven fabric to modify the surface of the cellulose nonwoven fabric; (c) neutralizing the surface-modified cellulose nonwoven fabric; (d) drying the neutralized cellulose nonwoven fabric to produce a nonwoven fabric for a mask pack; A method for producing a nonwoven fabric for a mask pack, comprising:

5. The absorption treatment is The method for producing a nonwoven fabric for a mask pack according to claim 3 or 4, wherein the cellulose nonwoven fabric is immersed in an alkaline solution alone or in a combination of the alkaline solution and a modifying additive, or the cellulose nonwoven fabric is sprayed with an alkaline solution alone or in a combination of the alkaline solution and a modifying additive.

6. The cellulose nonwoven fabric has a unidirectional or bidirectional property and a density of 20 to 100 g / m ２ The method for producing a nonwoven fabric for a mask pack according to claim 3 or 4, wherein the nonwoven fabric has a weight of

7. The method for producing a nonwoven fabric for mask packs according to claim 3 or 4, wherein the concentration of the alkaline solution is 5 to 40%.

8. The method for producing a nonwoven fabric for mask packs according to claim 3 or 4, wherein the aging is carried out at -10 to 100°C for 1 to 100 minutes.

9. The method for producing a nonwoven fabric for a mask pack according to claim 4, wherein a squeezing treatment is carried out after each of the steps (a) to (c).

10. 5. The method for producing a nonwoven fabric for a mask pack according to claim 4, wherein the surface is modified so that a rate of change in water retention of the cellulose nonwoven fabric after the surface modification in the step (b) is 40% or more compared to the water retention of the cellulose nonwoven fabric in the step (a).

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