Multi-layer film cloth and interlayer melt-blowing process thereof

Abstract

The multilayer film cloth comprises an ultrathin hydrophobic film layer, a directional flow guide layer, an active matter slow-release melt-blown layer, a bionic cuticle layer and an inner layer which are sequentially arranged from outside to inside, the outer layer is made of a thermoplastic polyurethane elastomer, and the thickness of the outer layer is 0.11 mm; temperature-sensitive hydrogel and hyaluronic acid microspheres are mixed in the active matter slow-release melt-blown layer; the bionic cuticle is a nanofiber electrostatic spinning membrane, and the aperture of the bionic cuticle is 0.1 mu m; the inner layer is natural silk base cloth and is made of superfine denier fibers, and the gram weight is 12g / m < 2 >; according to the facial mask, multiple functional layers are integrated together, so that the facial mask has good repairing and moisturizing effects on the face.

Description

Technical Field

[0001] The present invention relates to the technical field of facial masks, and specifically to a multi-layer fabric and its interlayer meltblown process. Background Art

[0002] With the continuous improvement of people's living standards, after meeting the basic needs of food, clothing, housing and transportation, people have also begun to pay attention to other aspects, such as their own appearance. Facial masks are used to temporarily isolate the outside air and pollution for a short time when covering the face, improve metabolism, and increase the oxygen content of the skin. A facial mask is a category of skin care products used for skin hydration, and also has multiple functions such as moisturizing, nourishing, improving appearance, and deep cleansing; facial masks have various effects according to the characteristics of the active ingredients contained in the lotion. The main function is to remove sebum and impurities in pores to make the skin smooth, and it helps to activate skin functions such as the supply of various nutrients and moisture, pore contraction, soothing effect, and enhanced elasticity. Therefore, nowadays, with the increasing attention to skin beauty, the phenomenon of using beauty facial masks to manage the skin has become widespread among both men and women, young and old.

[0003] In dermatology, the higher the water content of the skin, the better the absorption effect. Moreover, after hydrating and then applying essence, the facial mask can press the nutritional components in the essence into the skin together to promote absorption. Therefore, before applying a facial mask, it is necessary to keep the facial skin clean and moist at the same time. Of course, if our skin is dry, we can wash our face first, then use a cotton pad to apply water, and after getting wet, apply the facial mask. Only in this way can the skin absorb better. However, existing facial masks only provide the essence part, and additional hydration work is required, which is very inconvenient to use; and for some people with sensitive skin, their skin is already in a water-deficient state. Directly applying a facial mask will not only reduce the efficacy of the repair facial mask a lot, but also cause certain irritation to the already sensitive skin. Summary of the Invention

[0004] To solve the defects existing in the prior art, the present invention provides a multi-layer fabric and its interlayer meltblown process.

[0005] To solve the above technical problems, the present invention provides the following technical solutions:

[0006] A multi-layer fabric of the present invention includes an ultra-thin hydrophobic film layer, a directional diversion layer, an active substance slow-release meltblown layer, a bionic cutin layer, and an inner layer, which are arranged in sequence from outside to inside;

[0007] The outer layer is made of thermoplastic polyurethane elastomer and has a thickness of 0.11 mm;

[0008] The active substance slow-release meltblown layer is mixed with a temperature-sensitive hydrogel and hyaluronic acid microspheres;

[0009] The bionic cutin layer is a nanofiber electrospun membrane with a pore size of 0.1 μm;

[0010] The inner layer is a natural silk base fabric made of ultrafine denier fibers with a gram weight of 12 g / m 2 .

[0011] As a preferred technical solution of the present invention, the directional diversion layer is formed by melt-blown PP / collagen composite fibers with a fiber diameter of 5 μm, and laser micropores are formed in the directional diversion layer by laser.

[0012] As a preferred technical solution of the present invention, the pore size of the laser micropores is 20-50 μm.

[0013] As a preferred technical solution of the present invention, a sandwich melt-blown process is used to melt-blown the above-mentioned active substance sustained-release melt-blown layer, including the following steps:

[0014] Step 1: Perform raw material pretreatment, specifically modify the carrier polymer to obtain a modified carrier polymer, and encapsulate the active substance to obtain microcapsules;

[0015] Step 2: Modify the equipment to manufacture a two-stage extrusion system with a main screw and a side feeding screw. The main screw is used to extrude and melt the modified carrier polymer, and the side feeding screw is used to extrude and melt the microcapsules, and mix the modified carrier polymer and the microcapsules in the equipment;

[0016] Step 3: Set the melting section temperature of the main screw, PP: 180-200 °C, PLA: 160-180 °C. The side feeding screw is used for low-temperature injection of the microcapsules, and the temperature is 20-30 °C lower than that of the main screw; the main screw is 80-120 rpm, the side feeding screw is 20-40 rpm, the melt pressure is 2.5-3.5 MPa, and the residence time ≤ 3 minutes;

[0017] Step 4: Fiber forming, draw air flow, the temperature is 20-30 °C higher than the melt temperature, PP: 210-220 °C, PLA: 180-190 °C, speed: 0.5-0.8 Mach, pressure 0.35-0.45 MP;

[0018] Step 5: Fiber collection: The receiving distance is 15-25 cm, negative pressure adsorption (-5 kPa), the fiber diameter is 2-5 μm, and the active substance sustained-release melt-blown layer is obtained.

[0019] As a preferred technical solution of the present invention, the method for modifying the carrier polymer to obtain the modified carrier polymer is as follows: polypropylene (PP) or polylactic acid (PLA) needs to be dried to a humidity of <0.1%, then 3% maleic anhydride grafted product is added, and the mixing speed is 300 rpm for 15 minutes to obtain the modified carrier polymer.

[0020] As a preferred technical solution of the present invention, the method for embedding the active substance to obtain microcapsules is as follows: vitamin C, collagen or a drug is selected as the core material, sodium alginate and chitosan are selected as the wall material, and the mass ratio of the two is 2:1. After high-pressure homogenization, the particle size is 100-300 nm.

[0021] 0.5% nano-silica is also added to the active substance package and ultrasonic vibration is used to assist in dispersing it into the active substance package.

[0022] The beneficial effects of the present invention are as follows:

[0023] 1. The multi-layer film cloth uses thermoplastic polyurethane elastomer as the outer layer to lock water and prevent evaporation, and the humidity retention rate > 95%, thus avoiding the loss of essence. Among them, a directional diversion layer formed by melt-blown PP / collagen composite fibers is used, and laser micropores are formed on the directional diversion layer. The penetration rate of the essence is precisely controlled through the laser micropores (pore diameter 20-50 μm), and an active substance slow-release melt-blown layer is set. When the temperature rises, the active ingredients wrapped in the microspheres are released, so as to have a better repair effect on the face. By setting a bionic cutin layer structure to simulate the skin barrier and extend the residence time of the active ingredients, and using natural silk base cloth as the inner layer, it is super soft and skin-friendly, and the fitting degree is increased by 60%.

[0024] 2. The present invention also provides a specific sandwich meltblown process, specifically including raw material pretreatment, specifically modifying the carrier polymer to obtain a modified carrier polymer, and embedding the active substance to obtain microcapsules; modifying the equipment to manufacture a two-stage extrusion system with a main screw and a side feeding screw, where the main screw is used to extrude and melt the modified carrier polymer, and the side feeding screw is used to extrude and melt the microcapsules and mix the modified carrier polymer and the microcapsules in the equipment; setting the melting section temperature of the main screw, PP: 180 - 200 °C, PLA: 160 - 180 °C, and the side feeding screw is used for low-temperature injection of the microcapsules, with a temperature 20 - 30 °C lower than that of the main screw; the main screw rotates at 80 - 120 rpm, the side feeding screw rotates at 20 - 40 rpm, the melt pressure is 2.5 - 3.5 MPa, the residence time is ≤ 3 minutes for fiber forming, stretching air flow, with a temperature 20 - 30 °C higher than the melt temperature, PP: 210 - 220 °C, PLA: 180 - 190 °C, the speed is 0.5 - 0.8 Mach, and the pressure is 0.35 - 0.45 MP. Fiber collection: the receiving distance is 15 - 25 cm, negative pressure adsorption (-5 kPa), and the fiber diameter is 2 - 5 μm, obtaining an active substance sustained-release meltblown layer. Among them, through low-temperature side feeding and supersonic stretching, the retention rate of the active substance can be > 85%, making the mask more active and having a better facial repair effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation to the present invention.

[0026] In the drawings:

[0027] Figure 1 is a schematic structural diagram of a multi-layer film cloth of the present invention;

[0028] Figure 2 is a flowchart of a sandwich meltblown process of the present invention.

[0029] In the figure: 1. Ultra-thin hydrophobic film layer; 2. Directional diversion layer; 3. Active substance sustained-release meltblown layer; 4. Bionic cutin layer; 5. Inner layer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] The following describes the preferred embodiments of the present invention with reference to the drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0031] Example: As Figure 1 shown, a multi-layer film cloth of the present invention includes an ultra-thin hydrophobic film layer 1, a directional diversion layer 2, an active substance sustained-release meltblown layer 3, a bionic cutin layer 4, and an inner layer 5 arranged in sequence from outside to inside;

[0032] The outer layer 1 is made of thermoplastic polyurethane elastomer and has a thickness of 0.11 mm;

[0033] The active ingredient sustained-release meltblown layer 3 is mixed with a thermosensitive hydrogel and hyaluronic acid microspheres;

[0034] The bionic cutin layer 4 is a nanofiber electrospinning membrane with a pore diameter of 0.1 μm;

[0035] The inner layer 5 is a natural silk base fabric made of ultrafine denier fibers with a grammage of 12 g / m 2 。

[0036] Among them, the directional diversion layer 2 is formed by meltblowing PP / collagen composite fibers, the fiber diameter is 5 μm, and laser micropores are formed in the directional diversion layer by laser.

[0037] In the present invention, the outer layer is made of thermoplastic polyurethane elastomer to lock water and prevent evaporation, and the humidity retention rate > 95%, so as to avoid the loss of essence. Among them, through the directional diversion layer 2 formed by meltblowing PP / collagen composite fibers, and laser micropores are formed in the directional diversion layer 2 by laser. The penetration rate of the essence is accurately controlled by the laser micropore diameter of 20 - 50 μm, and the active ingredient sustained-release meltblown layer 3 is set. When the temperature rises, the active ingredients wrapped in the microspheres are released, so as to have a good repair effect on the face. By setting the bionic cutin layer 4 structure to simulate the skin barrier and extend the residence time of the active ingredients, and using the natural silk base fabric as the inner layer 5, it is ultra-soft and skin-friendly, and the fitting degree is increased by 60%.

[0038] Among them, the aperture of the laser micropores is 20 - 50 μm, so that it is easy to accurately control the penetration rate of the essence.

[0039] Among them, as Figure 2 shown, a sandwich meltblowing process is used to meltblow the above-mentioned active ingredient sustained-release meltblown layer, and it includes the following steps:

[0040] Step 1: Perform raw material pretreatment. Specifically, modify the carrier polymer to obtain a modified carrier polymer, and embed the active ingredients to obtain microcapsules; among them, the active ingredient accounts for 15 - 25% (mass fraction) to ensure the sustained-release effect.

[0041] Step 2: Modify the equipment to manufacture a two-stage extrusion system with a main screw and a side feeding screw. The main screw is used to extrude and melt the modified carrier polymer, and the side feeding screw is used to extrude and melt the microcapsules, and mix the modified carrier polymer and the microcapsules in the equipment;

[0042] Step 3: Set the temperature of the melting section of the main screw, PP: 180 - 200 °C, PLA: 160 - 180 °C. The side feeding screw is used for low-temperature injection of the microcapsules, and the temperature is 20 - 30 °C lower than that of the main screw; the main screw rotates at 80 - 120 rpm, the side feeding screw rotates at 20 - 40 rpm, the melt pressure is 2.5 - 3.5 MPa, and the residence time is ≤ 3 minutes; the active ingredient is injected at a low temperature (the temperature is 20 - 30 °C lower than that of the main screw) to prevent thermal decomposition.

[0043] Step 4: Fiber forming. The drawing air flow, the temperature is 20 - 30 °C higher than the melt temperature, PP: 210 - 220 °C, PLA: 180 - 190 °C, the speed is 0.5 - 0.8 Mach, and the pressure is 0.35 - 0.45 MP;

[0044] Step 5: Fiber collection: The receiving distance is 15 - 25 cm, negative pressure adsorption (-5 kPa), the fiber diameter is 2 - 5 μm, and an active ingredient sustained-release meltblown layer is obtained. Low-temperature side feeding plus supersonic drawing enables the retention rate of the active ingredient to be > 85%.

[0045] Among them, the method for modifying the carrier polymer to obtain the modified carrier polymer is to dry polypropylene (PP) or polylactic acid (PLA) to a humidity < 0.1%, then add 3% maleic anhydride grafted product, and mix at a rotation speed of 300 rpm for 15 minutes to obtain the modified carrier polymer, improving the dispersibility of the active ingredient.

[0046] The method for encapsulating the active ingredient to obtain microcapsules is to select vitamin C, collagen or drugs as the core material, select sodium alginate and chitosan as the wall material, and the mass ratio of the two is 2:1. After high-pressure homogenization, the particle size is 100 - 300 nm. The skin benefits and synergistic effects of sodium alginate and chitosan as the wall material, and the core effect of sodium alginate on the skin

[0047] Deep moisturizing and water locking, forming a breathable hydrogel film, continuously releasing moisture to the stratum corneum (the transepidermal water loss rate TEWL is reduced by 40 - 60%); carrying calcium ions to crosslink to form a three-dimensional network, improving the skin water content (clinical tests show 24-hour moisturizing + 32%).

[0048] Promote barrier repair, activate the expression of filaggrin in keratinocytes, accelerate epidermal renewal, regulate inflammatory factors (such as IL-6, TNF-α), and reduce erythema and sensitivity reactions. The unique advantages of chitosan are natural antibacterial protection, destroying the bacterial cell membrane by positive charge adsorption (the antibacterial rate against Staphylococcus aureus > 99%), and inhibiting the activity of Propionibacterium acnes (MIC = 0.1% concentration). Accelerate wound healing, promote the migration of fibroblasts (the scratch experiment shows that the healing speed is increased by 50%), and stimulate the secretion of type III collagen (ELISA detection concentration +45%). Adsorb and detoxify heavy metals, chelate heavy metals such as lead and cadmium in PM2.5 (the adsorption capacity reaches 120 mg / g). 0.5% nano-silica is also added to the active ingredient package and ultrasonically vibrated to assist in dispersing it into the active ingredient package.

[0049] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A multi-layer fabric, characterized in that: It includes a super-thin hydrophobic film layer (1), a directional flow guiding layer (2), an active substance slow-release meltblown layer (3), a bionic cutin layer (4) and an inner layer (5) arranged from outside to inside in sequence; The outer layer (1) is made of thermoplastic polyurethane elastomer and has a thickness of 0.11 mm; The active substance slow-release meltblown layer (3) is mixed with a thermosensitive hydrogel and hyaluronic acid microspheres; The bionic cutin layer (4) is a nanofiber electrospun membrane with a pore diameter of 0.1 μm; The inner layer (5) is a natural silk base fabric made of superfine denier fibers.

2. The multi-layer fabric according to claim 1, characterized in that, The directional flow guiding layer (2) is formed by meltblowing PP / collagen composite fibers with a fiber diameter of 5 μm, and laser micropores are formed in the directional flow guiding layer by laser.

3. The multi-layer fabric according to claim 2, wherein The pore diameter of the laser micropores is 20 - 50 μm.

4. A sandwich meltblowing process for meltblowing an active substance sustained-release meltblown layer as described in any one of claims 1-3, characterized in that, It includes the following steps: Step 1: Conduct raw material pretreatment, specifically modify the carrier polymer to obtain a modified carrier polymer, and perform active substance embedding to obtain microcapsules; Step 2: Modify the equipment to manufacture a two-stage extrusion system with a main screw and a side feeding screw. The main screw is used to extrude and melt the modified carrier polymer, and the side feeding screw is used to extrude and melt the microcapsules, and mix the modified carrier polymer and the microcapsules in the equipment; Step 3: Set the melting section temperature of the main screw, PP: 180 - 200 °C, PLA: 160 - 180 °C. The side feeding screw is used for low-temperature injection of the microcapsules, and the temperature is 20 - 30 °C lower than that of the main screw; the main screw is 80 - 120 rpm, the side feeding screw is 20 - 40 rpm, the melt pressure: 2.5 - 3.5 MPa, and the residence time ≤ 3 minutes; Step 4: Fiber forming, drawing air flow, the temperature is 20 - 30 °C higher than the melt temperature, PP: 210 - 220 °C, PLA: 180 - 190 °C, speed: 0.5 - 0.8 Mach, pressure 0.35 - 0.45 MP; Step 5: Fiber collection: The receiving distance is 15 - 25 cm, negative pressure adsorption (-5 kPa), fiber diameter 2 - 5 μm, to obtain the active substance slow-release meltblown layer.

5. The sandwich meltblown process according to claim 4, wherein, The method of modifying the carrier polymer to obtain a modified carrier polymer is to dry polypropylene (PP) or polylactic acid (PLA) to a humidity < 0.1%, then add 3% maleic anhydride grafted product, with a mixing speed of 300 rpm and a time of 15 minutes, to obtain the modified carrier polymer.

6. The coextrusion process according to claim 4, characterized in that, The method of obtaining microcapsules by active substance embedding is to select vitamin C, collagen or a drug as the core material, select sodium alginate and chitosan as the wall material, and the mass ratio of the two is 2:

1. After high-pressure homogenization, the particle size is 100 - 300 nm.

7. A sandwich meltblown process according to claim 4, wherein, 0.5% nano-silica is also added to the active substance package, and ultrasonic vibration is used to assist in dispersing it into the active substance package.

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