KR101955432B1 - Environment-friendly mask pack with asymmetry characteristic - Google Patents

Abstract

The present invention relates to an asymmetrically structured moisturizing mask pack comprising a polylactide.
More specifically, the present invention relates to a porous membrane mask pack prepared by copolymerizing a polylactide and polyvinyl alcohol, wherein the skin-contacting surface is hydrophilic and the back surface is hydrophobic.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a moisturizing mask pack having asymmetric structure,

More particularly, the present invention relates to a porous membrane mask pack prepared by copolymerizing polylactide and polyvinyl alcohol, wherein the surface of the mask pack is hydrophilic and the back surface thereof is hydrophobic. .

Skin is an organ that covers the outside and is an important tissue with biochemical and physical functions to protect the human body against the external environment.

However, recent serious air pollution and skin damage caused by exposure to ultraviolet rays are becoming serious. In particular, the face is the skin most exposed to the external environment, and it is very important to control the skin such as UV shielding, removal of wastes, skin moisturization. Excessive rinsing may cause dryness and roughness of the skin. Especially in sensitive skin, there is concern about the occurrence of atopic dermatitis due to hypersensitivity, inflammation, acne or inhibition of epidermal cell formation.

To solve this problem, a mask pack has been developed. The mask pack is a tool for supplying nutrition to the facial skin. When the skin becomes rough or fatigued, it packs a facial essence on the face and supplies moisture and cosmetic ingredients to the skin, effectively removing waste accumulated in the skin, It is a cosmetic that restores function.

Generally, a cosmetic mask pack is prepared by adding a cosmetic composition to a nonwoven fabric. However, the nonwoven fabric is stiffened by adding a cosmetic composition as a synthetic polymer, and feeling of use is poor. In addition, when the nonwoven fabric is dipped in a cosmetic composition, the cosmetic composition may be exposed to air, the skin composition may be denatured, the adhesion to the skin is low, and the cosmetic composition of high concentration may contact with the skin to cause skin irritation.

In order to overcome the disadvantages of such a nonwoven mask pack, research and development on a gel-type mask pack have been actively conducted. However, since the conventional gel-type mask can not maintain its outer shape with hydrogels alone, it has been generally used in addition to synthetic resin, nonwoven fabric, mesh or mesh. However, in many cases, the hydrogel was detached from the nonwoven fabric, and the hydrogel using the synthetic resin was controversial in terms of biocompatibility and stability. In addition, the moisturizing effect of the nonwoven mask pack and the hydrogel mask pack due to evaporation due to exposure to air has been controversial.

Accordingly, the present inventors have completed the present invention by developing a moisturizing mask pack having an asymmetric structure in which the skin contact surface is hydrophilic and the back surface is hydrophobic, by utilizing polylactide as a biocompatible material.

Claim 1 of the Korean Patent No. 10-1623779 (Mesh composed of a naturally occurring component and a hydrogel mask using it as a support) discloses a mesh used as a support for a hydrogel mask, 1 to 20% by weight of at least one fiber selected from the group consisting of soft wood pulp, cellulose regenerating fiber, Tencel and viscose rayon, a cellulose regenerating fiber, 80 to 99% by weight of natural corn fiber (PLA fiber) Is composed of a naturally occurring component.

Patent Registration No. 10-1623779 (published on March 31, 2008)

More particularly, the present invention relates to a porous membrane mask pack prepared by copolymerizing a polylactide and polyvinyl alcohol, wherein the skin-contacting surface is hydrophilic and the back surface is hydrophobic To provide a mask pack.

The present invention also provides an asymmetrically structured moisturizing mask pack, which is capable of enhancing adhesion to the skin and promoting absorption of nutrients by manufacturing the mask pack with the porous membrane.

The present invention relates to a mask pack which is formed of a porous membrane and has a hydrophobic surface on one surface and a hydrophilic surface on the other surface, characterized in that the hydrophilic surface is hydrophilized with a plasma surface treatment or an alkaline solution, So as to solve the technical problem.

The present invention aims to solve the technical problem by providing a moisturizing mask pack having an asymmetric structure, characterized in that the material of the porous membrane is a material in which polylactide and polyvinyl alcohol are copolymerized.

The present invention aims at solving the technical problem by providing an asymmetrically structured moisturizing mask pack characterized in that the porosity of the porous membrane is formed by a salt leaching phase transformation method.

The present invention provides a process for producing a polylactide-polylactide copolymer, comprising: a first step of copolymerizing a polylactide and polyvinyl alcohol; A second step of preparing the polypolyidide copolymer and the polyvinyl alcohol as a microfine sheet by electrospinning; A third step of preparing the microfiber sheet by a salt leaching phase transformation method as a porous membrane; And a fourth step of hydrophilizing the porous membrane with a plasma surface treatment or an alkaline solution. The present invention provides a method for manufacturing a moisturizing mask pack having an asymmetric structure.

The present invention is characterized in that the porous membrane is hydrophilic and has pores of 90 to 95% (v / v) and hydrophobic on the other side and has pores of 5 to 10% (v / v) The present invention provides a method for manufacturing a moisturizing mask pack having an asymmetric structure.

According to the present invention, there is provided a method for manufacturing a moisturizing mask pack having an asymmetric structure, characterized in that the porous membrane is treated with 5 to 20% (w / v) NaOH solution for 5 to 20 minutes for hydrophilization .

The present invention relates to an asymmetrically structured moisturizing mask pack comprising a polylactide, and more particularly to a porous membrane mask pack prepared by copolymerizing a polylactide and polyvinyl alcohol, wherein the skin-contacting surface is hydrophilic and the back surface is hydrophobic Pack.

The present invention is asymmetrically structured moisturizing mask pack for promoting the absorption of the mask pack composition into the skin, and it is considered that the range of industrial application is very wide in the development of a new material applicable to cosmetics.

1 is a view showing a polylactide which is a biocompatible material.
2 is a structural view of a surface and a cross section of a moisturizing mask pack having an asymmetric structure.
3 is a view of a silicon hydrogel mask pack which is a conventional mask pack.
4 is a view of an asymmetric structure moisturizing mask pack containing a polylactide.

The terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary meanings and the inventor can properly define the concept of the term to describe its invention in the best possible way And should be construed in accordance with the principles and meanings and concepts consistent with the technical idea of the present invention.

Therefore, the embodiments described in the present specification, the reference examples, and the drawings are merely the most preferred examples of the present invention, and not all of the technical ideas of the present invention are described. Therefore, It should be understood that various equivalents and modifications may be present.

Example 1. Preparation of asymmetric structure moisturizing mask pack using polylactide material

1) a first step of preparing a sheet by copolymerizing polylactide and polyvinyl alcohol;

Polylactide, a biocompatible material, has been used for fracture plates, screws and sutures since 30 years ago and is known to be decomposed into water and carbon dioxide in the body. Especially, it is known that polylactide particles are injected into the skin to promote collagen formation, and it is developed as a medical device in the United States and imported and sold to Korea. However, the polylactide shows a very different decomposition rate depending on the molecular weight, and the isomer of enantiomer exists, and the polylactide is mainly used as Poly-L-lactide.

In this embodiment, a biocompatible polylactide and a hydrophilic polyvinyl alcohol are copolymerized to prepare an asymmetric structure moisturizing mask pack in the form of a porous membrane. By applying the electrospinning method and salt leaching phase transformation method, it is possible to mass-produce a mask pack having micropores.

2) a second step of making the polypolyte copolymer and the polyvinyl alcohol as a microfine sheet by electrospinning;

Electrospinning is a process that can produce microfibers with nanometer range. Unlike the method which depends on the existing physical force, since the electric repulsion force is utilized in the fiber forming process, it is possible to make the materials which were difficult to be made into fibers into fibers, and to make them into a nonwoven form by a small amount of materials .

In addition, factors affecting the thickness of the fiber by electrospinning include solution concentration, applied voltage, tip to collector distance (TCD), flow rate, temperature, and humidity. In general, the concentration of the solution is proportional to the viscosity, and as the concentration increases under a certain voltage, the diameter of the fiber increases because the bending and stretching forces are reduced. Also, as the applied voltage increases, the whipping instability increases and the diameter of the fiber decreases, but the minimum diameter is obtained at a certain distance.

Electrospinning has the advantage that not only very thin fibers can be manufactured, but also the application range of the polymer is very wide, the apparatus is simple, and the spinning process is not complicated. Preferably, the thickness of the fiber is adjusted through electrospinning to increase the adhesion of the skin-contacting surface of the mask pack sheet.

In order to further upgrade the performance of the conventional beauty mask pack sheet, the sheet is made of microfine fibers by applying electrospinning to a sheet produced by copolymerizing polylactide and polyvinyl alcohol.

As a result, it is possible to improve the adhesion and moisturizing power to the skin, and the absorption rate of the essence is enhanced. In addition, it is excellent in skin adhesion force, and is effective for adsorbing fine dust and sebum to the fibrous tissue to remove noble metal.

3) a third step of preparing a porous membrane by the salt leaching phase transformation method of the microfiber sheet;

In a phase transition, phase refers to the physical and chemical properties of a substance in a given state. That is, it refers to a homogeneous part of a substance, which may be a pure substance or a mixture. Even in the case of a mixture, it is said that if the mixing is complete and uniform, it forms one phase. Also, in the phase transition, the transition means to move the position or position to another place.

That is, phase transition means that a phase, which is a homogeneous part of a material, changes to another phase due to a change in a variable such as temperature, pressure, magnetic field, composition, and so on, and is also referred to as phase transformation.

In addition, when a substance forms a phase, it can be divided into two phases by phase transformation partially by the change of the parameter, which is called phase separation. That is, phase separation is one of phenomena caused by phase transition.

In the membrane fabrication method using phase transformation or phase transformation or phase separation, the non-solvent induced phase separation method (NIPS), thermally induced phase separation membrane (TIPS), solvent evaporation Sedimentation, vapor phase sedimentation or evaporative sedimentation.

The non-solvent-derived phase separation method is also referred to as an immersion sedimentation method or a solvent exchange method. Since the manufacturing method is relatively simple and inexpensive, it is suitable for mass production. As a process, a thermodynamically stable polymer solution is prepared by dissolving a polymer to be used as a material in an appropriate solvent, casting it into a plate, a tube, or a hollow fiber, and immersing the polymer in a non-solvent, And the composition of the polymer solution is changed. This leads to the phase separation of the polymer, so that a part of the portion occupied by the solvent and the non-solvent becomes pores and thus a porous membrane can be produced.

The microfiber sheet is prepared by a salt leaching phase transformation method to produce a porous membrane having a pore size of 90% or more and a hydrophilic property. The backside has a pore size of 10% or less and hydrophobicity, Prevent infiltration. In addition, when the mask pack is attached to the skin, moisture is absorbed into the pores of the skin, and the skin moisturizing and composition penetrates well into the skin to enhance the efficacy.

2 is a structural view of a surface and a cross section of a moisturizing mask pack having an asymmetric structure. Fig. 2 is a diagram showing a hydrophobic surface and a hydrophilic cross-section as an asymmetric structure produced by the phase transfer method.

Particularly, when the mask pack is attached to the skin, the temperature of the substance contained in the pack is increased. Thus, the composition of the mask pack promotes skin absorption and suppresses evaporation in the atmosphere to the hydrophobic surface.

A porous membrane having pores of 90 to 95% (v / v) and 5 to 10% (v / v) on the skin-adhered surface is prepared by the phase transfer method to suppress evaporation of the mask pack composition in the atmosphere, Promotes absorption in the skin.

4) a fourth step of hydrophilizing the porous membrane on one surface through a plasma surface treatment or an alkali solution;

Because of the non-polar molecular structure, most polymers, such as polyethylene and polypropylene, are hydrophobic. Therefore, the absorption of the mask pack composition on the surface contacting the skin can be inhibited.

Accordingly, the present inventors hydrophilized one surface of the porous membrane through plasma treatment, thereby allowing the mask pack composition to be contained on the skin-contacting surface to promote skin absorption.

Preferably, the skin contact surface is hydrophilized through the plasma surface treatment using a plasma chemical vapor deposition method. As a result, the skin-contacting surface increases the hydrophilicity by the plasma treatment, and the back surface is hydrophobic, inhibiting microbial growth inhibition and evaporation of the mask pack composition.

In addition, the alkali solution can be treated to make the porous membrane friendlier. Preferably the porous membrane via NaOH is hydrophilized at 10% for 20 minutes.

Experimental Example 1. Polylated asymmetric structure mask pack hydrophilization

The hydrophilization process of the asymmetric structure mask pack comprising the polylactide (PLA: Polyactic Acid) prepared in the above embodiment.

1) Prepare PLA membrane, PLGA (polylactic-co-glycolic acid) membrane, 20mm * 30mm.

2) 5, 10, 20, 30, 40, 50% (w / v) NaOH were prepared.

3) Add 20 ml of NaOH solution to the Petri dish, and process the sheet for hydrophilization.

4) One side of the PLA membrane and the PLGA membrane is immersed in NaOH solution.

5) for 1 hour at a 10 minute rate.

As a result, it is preferable that the PLA membrane is hydrophilized at 10% to 20 minutes and at 20% to 10% for 10 minutes via NaOH.

Experimental Example 2 Manufacture of mask pack composition

The mask pack composition was prepared containing herbal extracts, solvents, wetting agents, viscosity modifiers, surfactants, skin conditioners, preservatives, thickeners, pH adjusting agents, flavoring agents and chelating agents. And the content thereof is set to such an extent that it can be easily utilized by those having ordinary knowledge in the field to prepare the pack composition.

Mask pack sheet
sample 1
An asymmetric structured moisturizing mask pack containing the polylactide prepared in Example 1
sample 2
PLA nonwoven sheet
sample 3
PLGA Membrane Sheet
sample 4
Commonly available mask pack sheets

Example 3. Evaluation of moisturizing satisfaction and skin stability sensory evaluation

A sensory test was performed on a 9-point scale (1 to 9) for satisfaction of moisturization, skin stability, and tactile feeling according to the mask pack sheet prepared in the same mask pack composition. The panel included 20 males and 20 females in their 20s and 30s. The results of the test are shown in Table 2 below. The higher the number, the better the effect.

Moisture satisfaction Skin stability touch Overall assessment sample 1 8.5 7.9 8.0 8.3 sample 2 4.3 5.6 4.2 4.7 sample 3 5.5 4.3 5.6 5.3 sample 4 2.3 3.1 2.0 2.4

Referring to Table 2, it can be seen that the overall moisturizing effect by the asymmetric structure moisturizing mask pack containing polylactide is the highest.

Experimental Example 4. Evaluation of moisture retention ability

The water retention capacity of each sheet manufactured in 1 in the above test was evaluated as follows. The water retention capacity was measured by measuring the electrical conductivity of the skin surface using SKICON-200. In a constant temperature and humidity chamber maintained at 25 ° C and 40% relative humidity, a mask pack was attached to each skin 16 cm ² for 30 minutes, and the resistance value (water loss amount) was measured over time.

sample 1
sample 2
sample 3
sample 4
Short-term moisturizing

1 hour after removal
820
650
520
300
Long-term moisturizing
Use once a day for 5 days
30
5.3
26
5.8

Referring to the above Table 3, it can be seen that the asymmetric structure moisturizing mask pack containing polylactide has the highest overall water holding ability.

Claims (6)

A mask pack comprising a porous membrane, a hydrophobic surface on one side, and a hydrophilic surface on the other side, wherein the hydrophilic surface is hydrophilicized with an alkali solution,
The material of the porous membrane is selected from copolymers of polylactide and polyvinyl alcohol,
The porosity of the porous membrane is imparted by a salt leaching phase transformation method. The hydrophilic surface of the porous membrane has pores of 90 to 95% (v / v) and the hydrophobic surface has porosity of 5 to 10% (v / v) Wherein the holding member has an asymmetrical structure.
delete delete A first step of copolymerizing a polylactide and polyvinyl alcohol;
A second step of preparing the polypolyidide copolymer and the polyvinyl alcohol as a microfine sheet by electrospinning;
A third step of preparing the microfiber sheet by a salt leaching phase transformation method as a porous membrane; And
And a fourth step of treating the porous membrane with 5 to 20% (w / v) NaOH solution for 5 to 20 minutes for hydrophilization,
Characterized in that the porous membrane is hydrophilic and has 90 to 95% (v / v) pores, and the other surface is hydrophobic and has 5 to 10% (v / v) pores. Gt;
delete delete

Images