Degradable environment-friendly dry mask and preparation method thereof

Abstract

The invention relates to the technical field of facial masks, in particular to a degradable environment-friendly dry facial mask and a preparation method thereof. Comprising a PLA hydrophobic layer, a silk mask hydrophilic layer and a moisturizing functional super-hydrophilic layer in sequence from outside to inside, the PLA hydrophobic layer comprises a blend prepared from PLA and a degradable toughening agent, the silk mask hydrophilic layer is prepared from natural silk, and the moisturizing functional super-hydrophilic layer is a blend prepared from hexadecyl trimethyl ammonium bromide, nicotinamide and guar gum. The degradable environment-friendly dry mask simulates plant transpiration, functional masks with different pore diameters are prepared, super-hydrophilic guar gum narrow nanofibers and hydrophobic PLA micron fibers are prepared on the two sides of a hydrophilic layer of a silk mask, nicotinamide is wrapped in the guar gum nanofibers, and the functional masks with different pore diameters are prepared. The pore size difference of the mask can effectively convey water to the skin, moisten the dry skin and increase the water content of the skin.

Description

Technical Field

[0001] The invention relates to a facial mask, in particular to a degradable and environment-friendly dry facial mask and a preparation method thereof. Background Art

[0002] Facial masks have been highly sought after since their introduction, becoming the first choice for whitening and skin care in people's lives. Among them, the patch mask is one of the most popular mainstream masks. It is made of a fiber membrane with nutrient solution on it. It is very simple to use, just apply the mask on your face and wait for a while before removing it. There are two types of patch masks on the market, one is a wet mask with nutrient solution on the fiber membrane, and the other is a dry mask with only a fiber membrane, which requires nutrient solution to be prepared before use. Wet masks are more convenient to use, but the cost is higher, and the plastic bags used to store wet masks also bring serious environmental pollution problems. Dry masks do not contain nutrient solution and can be packaged in paper bags to reduce environmental and economic pressure. However, dry masks require the preparation of nutrient solution in advance, which is cumbersome and inefficient to use. The water retention performance of dry masks without any treatment is also not guaranteed. Consumers usually prefer to buy wet masks that are easy to use and have better water retention performance, rather than dry masks because of environmental protection and low price. Therefore, enhancing the functionality and water retention performance of dry masks is the direction that researchers have been working on.

[0003] Biodegradable materials are one of the key solutions to current environmental issues, and are particularly suitable for applications that are not suitable for reuse and are difficult or impossible to recycle. Under suitable conditions, biodegradable materials can be rapidly degraded into carbon dioxide and water without producing additional pollutants. Summary of the invention

[0004] The present invention aims to solve the above-mentioned defects and provide a degradable and environmentally friendly dry facial mask and a preparation method thereof.

[0005] In order to overcome the defects existing in the background technology, the technical solution adopted by the present invention to solve the technical problem is: it includes a structure of a three-layer electrospun fiber membrane composite composition, which is composed of a PLA hydrophobic layer, a silk mask hydrophilic layer, and a moisturizing functional super hydrophilic layer from the outside to the inside, the PLA hydrophobic layer contains a blend made of 70-95 parts of PLA and 5-30 parts of a degradable toughening agent, the silk mask hydrophilic layer is made of natural silk, and the moisturizing functional super hydrophilic layer is a blend made of 0.5-50 parts of hexadecyltrimethylammonium bromide, 0.1-50 parts of niacinamide, and 0.1-50 parts of guar gum.

[0006] According to another embodiment of the present invention, the PLA further comprises a weight average molecular weight Mw of 0.6-2×10 5 g / mol.

[0007] According to another embodiment of the present invention, the thickness ratio of the PLA hydrophobic layer, the silk mask hydrophilic layer, and the moisturizing functional super hydrophilic layer is further comprised of 1:(0.3-1.5):(0.1-0.5).

[0008] The method for making a degradable and environmentally friendly dry facial mask comprises: Step 1: Prepare a PLA hydrophobic layer: Add PLA particles to a CF / DMSO solution (v / v=9:1) at room temperature, stir for 4 hours to obtain a uniform PLA spinning solution, inject the PLA solution into a plastic syringe, place it on an electrospinning machine, extrude the spinning solution at a constant flow rate of 0.2-200 mL / h, keep the distance from the needle tip at the front end of the extrusion device to the aluminum foil collector at 15 cm, apply a voltage of 10-40 kV to the needle, separate the fiber membrane from the aluminum foil, and vacuum dry at room temperature for 8 hours to obtain PLA hydrophobic fibers; Step 2: Prepare a moisturizing functional super hydrophilic layer: at room temperature, add hexadecyltrimethylammonium bromide, nicotinamide, and guar gum to 100 parts of deionized water in sequence, stir for 4 hours, and centrifuge to obtain a uniform spinning solution. Inject the spinning solution into a plastic syringe, place it on an electrospinning machine, extrude the spinning solution at a constant flow rate of 5 mL / h, keep the distance from the front needle tip of the extrusion equipment to the aluminum foil collector at 10-30 cm, apply a voltage of 25-60 kV to the needle, separate the fiber membrane from the aluminum foil, and vacuum dry at room temperature to prepare a super hydrophilic layer. Step 3: Composite facial mask: prepare a super hydrophilic layer on one side of the hydrophilic layer of the silk mask by electrospinning. After preparing the super hydrophilic layer, prepare a PLA hydrophobic layer on the other side of the hydrophilic layer of the silk mask by electrospinning. Dry the prepared three-layer fiber membrane in vacuum at room temperature for 8 hours to obtain an environmentally friendly dry facial mask.

[0009] The beneficial effects of the present invention are as follows: the degradable and environmentally friendly dry mask simulates plant transpiration, prepares functional masks with different pore sizes, prepares super-hydrophilic guar gum narrow nanofibers and hydrophobic PLA microfibers on both sides of the hydrophilic layer of the silk mask, and wraps niacinamide in the guar gum nanofibers, so that the difference in pore size of the mask can effectively transport water to the skin, moisturize dry skin, and increase the water content of the skin. The directional water transport function of the mask can also help the skin lock in moisture, prevent water loss, and keep the skin moist and smooth; in this process, the high efficiency and orientation of water transport are guaranteed; at the same time, polylactic acid is an internationally recognized biodegradable material, and due to its own bio-based and degradable characteristics, it is an ideal substrate for preparing environmentally friendly masks. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0011] Figure 1It is a schematic diagram showing a strict linear relationship between absorbance and solution concentration measured based on standard solution; Figure 2 is a schematic diagram of the nicotinamide release capacity; Figure 3 This is a comparison chart of the water evaporation of this mask and commercially available natural silk masks over time. The greater the evaporation, the worse the water retention performance. DETAILED DESCRIPTION

[0012] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0013] A degradable and environmentally friendly dry facial mask includes a three-layer electrospun fiber membrane composite structure, which includes a PLA hydrophobic layer, a silk mask hydrophilic layer, and a moisturizing functional super hydrophilic layer from the outside to the inside. The PLA hydrophobic layer contains a blend made of 70-95 parts of PLA and 5-30 parts of a degradable toughening agent, the silk mask hydrophilic layer is made of natural silk, and the moisturizing functional super hydrophilic layer is a blend made of 0.5-50 parts of hexadecyltrimethylammonium bromide, 0.1-50 parts of niacinamide, and 0.1-50 parts of guar gum.

[0014] PLA, weight average molecular weight Mw is 0.6-2×10 5 g / mol.

[0015] The thickness ratio of the PLA hydrophobic layer, the silk mask hydrophilic layer, and the moisturizing functional super hydrophilic layer is 1:(0.3-1.5):(0.1-0.5).

[0016] The method for making a degradable and environmentally friendly dry facial mask comprises: Step 1: Prepare a PLA hydrophobic layer: Add PLA particles to a CF / DMSO solution (v / v=9:1) at room temperature, stir for 4 hours to obtain a uniform PLA spinning solution, inject the PLA solution into a plastic syringe, place it on an electrospinning machine, extrude the spinning solution at a constant flow rate of 0.2-200 mL / h, keep the distance from the needle tip at the front end of the extrusion device to the aluminum foil collector at 15 cm, apply a voltage of 10-40 kV to the needle, separate the fiber membrane from the aluminum foil, and vacuum dry at room temperature for 8 hours to obtain PLA hydrophobic fibers; Step 2: Prepare a moisturizing functional super hydrophilic layer: at room temperature, add hexadecyltrimethylammonium bromide, nicotinamide, and guar gum to 100 parts of deionized water in sequence, stir for 4 hours, and centrifuge to obtain a uniform spinning solution. Inject the spinning solution into a plastic syringe, place it on an electrospinning machine, extrude the spinning solution at a constant flow rate of 5 mL / h, keep the distance from the front needle tip of the extrusion equipment to the aluminum foil collector at 10-30 cm, apply a voltage of 25-60 kV to the needle, separate the fiber membrane from the aluminum foil, and vacuum dry at room temperature to prepare a super hydrophilic layer. Step 3: Composite facial mask: prepare a super hydrophilic layer on one side of the hydrophilic layer of the silk mask by electrospinning. After preparing the super hydrophilic layer, prepare a PLA hydrophobic layer on the other side of the hydrophilic layer of the silk mask by electrospinning. Dry the prepared three-layer fiber membrane in vacuum at room temperature for 8 hours to obtain an environmentally friendly dry facial mask.

[0017] Directional Water Transport (DWT) refers to the construction of a fiber membrane with asymmetric wettability, so that water can only be transported from the hydrophobic layer to the hydrophilic layer of the fiber membrane, but not in the opposite direction. In this process, the hydrophilic layer of the fiber membrane is completely soaked, while the hydrophobic layer remains dry. Based on the directional water transport mechanism of the membrane and the transpiration of plants, a hydrophobic polylactic acid (PLA) nanofiber layer and a super-hydrophilic guar gum (GG) nanofiber layer were prepared on both sides of a silk mask (SM) by electrospinning, and a biomimetic directional water transport degradable and environmentally friendly dry mask based on guar gum was obtained. The results show that the moisturizing functional super-hydrophilic layer can expand directionally to form a "gel" after absorbing water, which enhances the adhesion and water retention of the degradable and environmentally friendly dry mask to the skin. The nicotinamide (NAM) encapsulated in the moisturizing functional super-hydrophilic layer ensures that the degradable and environmentally friendly dry mask can continuously release nicotinamide during the working process, so that the mask has excellent whitening and antibacterial properties. The biodegradable and environmentally friendly dry facial mask not only retains the advantages of silk facial mask, but also expands the functions that silk facial mask does not have, providing ideas for designing more practical and ideal facial masks in the future.

[0018] Antibacterial test: The inhibition zone method was used, and the bacteria used were Staphylococcus aureus and Escherichia coli. TAP, tryptophan and yeast extract were used as culture media. First, the degradable and environmentally friendly dry mask and the pure natural silk mask were cut into circles with a diameter of 0.5 cm. Then 500 μL of Staphylococcus aureus and Escherichia coli suspensions were added to the agar plate respectively. Finally, the degradable and environmentally friendly dry mask and the silk mask were disinfected under UV light for 30 min, then attached to the agar plate and cultured at 37°C. The growth of bacteria on the plate was directly observed. The inhibition zone radius of the degradable and environmentally friendly dry mask against Staphylococcus aureus and Escherichia coli were 0.42 and 0.345 cm, respectively; Niacinamide release capacity, such as Figure 1 As shown, guar gum / cetyltrimethylammonium bromide / nicotinamide dry powder solutions containing 40 μg / mL nicotinamide (NAM) were prepared and diluted to 2 / 3, 1 / 2, 1 / 4, and 1 / 8, respectively. The absorbance of the five solutions was measured by a UV spectrophotometer to draw a standard curve.

[0019] According to the standard solution, the absorbance and solution concentration show a strict linear relationship, and the niacinamide content in the solution can be directly calculated by spectrophotometry. A certain weight of the moisturizing functional super hydrophilic layer is immersed in an appropriate amount of deionized water and placed on a shaker at 37°C. At predetermined time intervals, the absorbance of the solution is measured. It can be seen that the niacinamide release of the moisturizing functional super hydrophilic layer reaches 90% within 5 minutes, which fully meets the use conditions of the mask, such as Figure 2 shown.

[0020] Water retention test method: The water retention performance of the two fiber membranes was compared by calculating the water evaporation weight per unit area (WEW). The experimental operation is as follows: take the moisturizing functional super hydrophilic layer and the silk mask hydrophilic layer with the same surface area, soak them in water for 1 hour, weigh them, and record them as Q0. The weight change after 30 minutes at room temperature is measured and recorded as Q. The water retention rate E is calculated as follows: .

[0021] According to the test results, it can be seen that after the moisturizing functional super hydrophilic layer reaches a certain evaporation amount, the water will no longer evaporate over time for a period of time, and the moisturizing effect is much higher than that of the natural silk mask. Figure 3 shown.

[0022] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A degradable and environmentally friendly dry facial mask, characterized in that: The structure includes a three-layer electrospun fiber membrane composite composition, which includes a PLA hydrophobic layer, a silk mask hydrophilic layer, and a moisturizing functional super hydrophilic layer from the outside to the inside. The PLA hydrophobic layer contains a blend made of 70-95 parts of PLA and 5-30 parts of a degradable toughening agent, the silk mask hydrophilic layer is made of natural silk, and the moisturizing functional super hydrophilic layer is a blend made of 0.5-50 parts of hexadecyltrimethylammonium bromide, 0.1-50 parts of niacinamide, and 0.1-50 parts of guar gum.

2. The degradable and environmentally friendly dry facial mask according to claim 1, characterized in that: The PLA has a weight average molecular weight Mw of 0.6-2×10 5 g / mol.

3. The degradable and environmentally friendly dry facial mask according to claim 1, characterized in that: The thickness ratio of the PLA hydrophobic layer, the silk mask hydrophilic layer, and the moisturizing functional super hydrophilic layer is 1:(0.3-1.5):(0.1-0.5).

4. The method for making a degradable and environmentally friendly dry facial mask according to claim 1, characterized in that: The preparation method comprises: Step 1: Prepare a PLA hydrophobic layer: Add PLA particles to a CF / DMSO solution (v / v=9:1) at room temperature, stir for 4 hours to obtain a uniform PLA spinning solution, inject the PLA solution into a plastic syringe, place it on an electrospinning machine, extrude the spinning solution at a constant flow rate of 0.2-200 mL / h, keep the distance from the needle tip at the front end of the extrusion device to the aluminum foil collector at 15 cm, apply a voltage of 10-40 kV to the needle, separate the fiber membrane from the aluminum foil, and vacuum dry at room temperature for 8 hours to obtain PLA hydrophobic fibers; Step 2: Prepare a moisturizing functional super hydrophilic layer: at room temperature, add hexadecyltrimethylammonium bromide, nicotinamide, and guar gum to 100 parts of deionized water in sequence, stir for 4 hours, and centrifuge to obtain a uniform spinning solution. Inject the spinning solution into a plastic syringe, place it on an electrospinning machine, extrude the spinning solution at a constant flow rate of 5 mL / h, keep the distance from the front needle tip of the extrusion equipment to the aluminum foil collector at 10-30 cm, apply a voltage of 25-60 kV to the needle, separate the fiber membrane from the aluminum foil, and vacuum dry at room temperature to prepare a super hydrophilic layer. Step 3: Composite facial mask: prepare a super hydrophilic layer on one side of the hydrophilic layer of the silk mask by electrospinning. After preparing the super hydrophilic layer, prepare a PLA hydrophobic layer on the other side of the hydrophilic layer of the silk mask by electrospinning. Dry the prepared three-layer fiber membrane in vacuum at room temperature for 8 hours to obtain an environmentally friendly dry facial mask.

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