A nanofiber membrane material for makeup remover cotton pads and its preparation method

Abstract

The present invention discloses a nanofiber membrane material for makeup remover cotton and its preparation method, belonging to the field of cosmetic materials. The nanofiber membrane material for makeup remover cotton has a core-sheath structure and the core is wrapped with makeup remover oil. By using the coaxial electrospinning process, a mixed solution of cellulose acetate with a small amount of polyvinylpyrrolidone in ethanol / acetone / N,N-dimethylacetamide is used as the sheath layer, and an ethanol solution of polyvinylpyrrolidone and makeup remover oil is used as the core liquid to prepare nanofibers with a core-sheath structure. The makeup remover oil is stored in the fiber core. While the fiber wraps the makeup remover oil, pores are formed on the fiber surface after encountering water to release the internal components. It not only has the functions of traditional makeup remover cotton being lightweight and easy to absorb water, but also can directly remove makeup when encountering water. Compared with traditional makeup remover cotton, it is more convenient to use, has good air permeability and obvious makeup removal effect. The preparation method is simple and the cost is low, having good application prospects.

Description

Technical Field

[0001] The present invention belongs to the field of cosmetic materials, and particularly relates to a nanofiber membrane material for makeup remover cotton and a preparation method thereof. Background Art

[0002] With the development of technology and the improvement of living standards, people's requirements for skin care and cleaning are also getting higher and higher. When using cosmetics, since cosmetics can cause harm to the skin, it is often necessary to clean them in time, and makeup remover cotton is one of the commonly used skin care and cleaning tools. Most of the ordinary makeup remover cotton is made of thick absorbent cotton inside. When using it, it is necessary to press or pour makeup remover liquid onto the makeup remover cotton, and too much makeup remover liquid is likely to cause waste and increase the use cost. Therefore, there is an urgent need for a portable makeup remover cotton with makeup removal effect.

[0003] Chinese Patent CN211581889U discloses a makeup remover cotton with self - contained makeup remover liquid. The main body includes a bottom makeup - removing layer, that is, a makeup remover cotton layer containing makeup remover liquid is provided on one side surface of the bottom layer, and raised portions in a grid shape are evenly distributed on the outer surface of the makeup remover cotton layer; Chinese Patent CN209788896U discloses a makeup remover cotton that is convenient to use and has good makeup removal effect. Its product includes a protective layer and a cotton layer, and a solid makeup - removing ingredient layer is evenly attached to the upper surface and the lower surface of the cotton layer. The protective layer covers the makeup - removing ingredient layers on both sides of the cotton layer and is press - connected to the cotton layer. However, the above methods essentially separate the makeup - removing layer from the base layer, and there are problems such as thick cotton sheet layers, complex operations, and high costs. Summary of the Invention

[0004] To overcome the above - mentioned deficiencies of the prior art, the first object of the present invention is to provide a nanofiber membrane material for makeup remover cotton.

[0005] The second object of the present invention is to provide a preparation method of the above - mentioned nanofiber membrane material for makeup remover cotton.

[0006] To achieve the above object, the technical solution of the present invention is as follows:

[0007] The present invention provides a nanofiber membrane material for makeup remover cotton, which has a core - sheath structure, and the core part is wrapped with makeup remover oil.

[0008] The present invention also provides a preparation method of the above - mentioned nanofiber membrane material for makeup remover cotton, including the following steps:

[0009] (1) Respectively measure acetone (Ac), N,N - dimethylacetamide (DMAc) and ethanol (EtOH) and add them into a screw - mouth conical flask. Weigh dry polyvinylpyrrolidone (PVP) and cellulose acetate (CA) powders and add them into the above screw - mouth conical flask containing Ac, DMAc and EtOH, and stir magnetically to obtain a clear and uniform polymer solution;

[0010] (2) Measure ethanol and makeup remover oil separately and add them into a screw - mouth conical flask. Add PVP powder into the screw - mouth conical flask containing ethanol and makeup remover oil, and stir magnetically to obtain a translucent polymer solution;

[0011] (3) Use a syringe to draw the polymer solutions from steps (1) and (2) respectively, and place them on the propulsion pumps of the sheath layer and the core layer. Connect the positive pole of the high - voltage power supply to the needle of the coaxial electrospinning head, and the negative pole to the aluminum foil with good grounding treatment. Set the coaxial electrospinning parameters, use the aluminum foil as the receiver to receive the nanofibers, turn on the high - voltage power supply, and perform coaxial electrospinning to obtain.

[0012] Preferably, in step (1), the mass - to - volume ratio of polyvinylpyrrolidone, cellulose acetate, acetone, N,N - dimethylacetamide, and ethanol is 0.5–1.5 g: 2.0–5.0 g: 10–50 ml: 10–50 ml: 10–50 ml, and more preferably 1.0–1.2 g: 4.5–4.8 g: 10–40 ml: 10–40 ml: 10–40 ml.

[0013] Preferably, in step (1), the magnetic stirring time is 12–24 h, and more preferably 22–24 h.

[0014] Preferably, in step (2), the mass - to - volume ratio of polyvinylpyrrolidone, makeup remover oil, and ethanol is 1.0–1.5 g: 1.0–5.0 ml: 80–100 ml, and more preferably 1.0–1.3 g: 1.0–2.0 ml: 90–100 ml.

[0015] Preferably, in step (2), the magnetic stirring time is 12–24 h, and more preferably 22–24 h.

[0016] Preferably, in step (3), the electrospinning voltage is 16–20 KV, the core - liquid flow rate is 0.5–2.0 ml / h, and the receiving distance is 10–18 cm.

[0017] Preferably, in step (3), the electrospinning voltage is 16–18 KV, the sheath - liquid flow rate is 0.5–1.0 ml / h, and the receiving distance is 16–18 cm.

[0018] More preferably, in step (3), the core - liquid flow rate is twice the sheath - liquid flow rate.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention adopts a coaxial electrospinning process to directly store the makeup remover oil in the core of the nanofiber membrane material. Among them, cellulose acetate is hydrophilic, extremely easy to absorb water but insoluble in water; polyvinylpyrrolidone is hydrophilic and soluble in water when wetted, and drives the makeup remover oil wrapped in the fiber core to be released to the fiber surface. It not only has the functions of the traditional makeup remover cotton, which is light and easy to absorb water, but also can directly remove makeup when encountering water. Compared with the traditional makeup remover cotton, it is more convenient to use, has good air permeability and obvious makeup removal effect. In addition, the preparation method of the nanofiber membrane material for the makeup remover cotton in the present invention is simple and low in cost, and has good application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic process flow diagram of the method for preparing the nanofiber membrane material for the makeup remover cotton in Example 1.

[0021] Figure 2 is a schematic diagram of the effect of the nanofiber membrane material for the makeup remover cotton prepared in Example 1 to release the makeup remover oil when encountering water.

[0022] Figure 3 is a scanning electron microscope image of the nanofiber membrane material for the makeup remover cotton in Example 2. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0024] In the following embodiments, the electrospinning process refers to pouring the electrospinning solution into a syringe, placing the syringe in an injection pump, advancing the liquid at a certain rate by the injection pump, and simultaneously connecting a high-voltage electrostatic generator to the needle for electrospinning. The electrospun fibers are collected on an aluminum foil to obtain porous nanofibers. Among them, the micro-injection pump used in the experiment is KDS100 / KDS200 produced by the micro-injection pump manufacturer, the high-voltage electrostatic generator for electrospinning is provided by ZGF60kV / 2mA produced by Wuhan Huatian Power Automation Co., Ltd., the scanning electron microscope is JSM5600LV produced by JEOL Ltd., the magnetic stirrer is 81-2 produced by Shanghai Sile Instrument Co., Ltd., and the drugs used in the experiment are used directly without treatment after purchase.

[0025] Figure 1 An exemplary preparation method of a nanofiber membrane material for a makeup remover cotton is described as follows:

[0026] Step 1: Add PVP and CA powders as precursors into a mixed solvent containing Ac, DMAc, and EtOH, and stir on a magnetic stirrer to obtain a clear polymer solution.

[0027] Step 2: Add PVP powder into the EtOH of the mixed makeup remover oil and stir on a magnetic stirrer to obtain a translucent polymer solution.

[0028] Step 3: Adopt the coaxial electrospinning process to prepare nanofiber membrane materials using the polymer solutions in Step 1 and Step 2 as the sheath layer and core layer electrospinning solutions.

[0029] Example 1

[0030] Sheath solution preparation: Use a pipette to separately transfer 40 ml of Ac, 10 ml of DMAc, and 10 ml of EtOH into a 100-ml screw-cap conical flask to obtain a mixed solvent of Ac, DMAc, and EtOH. Use an electronic analytical balance to separately weigh PVP and CA powders and add them into the screw-cap conical flask containing the mixed solvent of Ac, DMAc, and EtOH. Add a magnetic rotor and tighten the bottle cap. Among them, PVP:CA = 1:4 (w / w). Place the conical flask on a magnetic stirrer at room temperature and stir for 24 h to obtain a colorless transparent solution.

[0031] Core solution preparation: Use a pipette to separately transfer 100 ml of anhydrous ethanol and 5 ml of makeup remover oil into a screw-cap conical flask. Use an electronic analytical balance to weigh PVP powder and add it into the screw-cap conical flask containing ethanol and makeup remover oil. Add a magnetic rotor and tighten the bottle cap. Among them, PVP is 13% (w / v). Place the conical flask on a magnetic stirrer at room temperature and stir for 24 h to obtain a translucent solution.

[0032] Electrospinning: Carefully place the prepared spinning solutions into 10-ml and 20-ml syringes as the core solution and sheath solution respectively, and install them on a micro-injection pump. Use alligator clips to connect the high-voltage electrostatic box and a self-made coaxial spinning head. Use a hard paper box wrapped with aluminum foil as the fiber receiving device under the condition of ensuring grounding. Set the electrospinning parameters as follows: spinning voltage 17 kV, core solution flow rate 1.0 ml / h, sheath solution flow rate 0.5 ml / h, receiving distance 16 cm, to obtain a nanofiber membrane, denoted as F1.

[0033] As Figure 2 shown, when the above nanofiber membrane contacts water, polyvinylpyrrolidone in the fiber dissolves in water, thereby forming channels on the fiber surface and releasing the makeup remover oil components stored in the fiber core, making the fiber membrane have the function of cleaning and removing makeup.

[0034] Example 2

[0035] Collect the fiber membrane prepared in Example 1 with aluminum foil paper, seal the sample in a drying dish with a plastic bag, and dry the sample by completely volatilizing the solvent. Cut off the prepared fiber membrane together with the aluminum foil paper, fix it on the scanning electron microscope (SEM) sample stage with conductive glue, and sputter coat the surface of the sample with gold in a nitrogen atmosphere to make the sample conductive. Then, use a scanning electron microscope to characterize the microscopic morphology of the sample. As Figure 3 shown, it can be seen that there are no beaded or spindle structures in the fibers of the nanofiber membrane, and it has a good linear morphology.

[0036] In summary, the present invention adopts a coaxial electrospinning process, using an ethanol / acetone / N,N-dimethylacetamide solution of cellulose acetate doped with a small amount of polyvinylpyrrolidone as the sheath layer, and an ethanol solution of polyvinylpyrrolidone and makeup remover oil components as the core liquid to prepare a nanofiber structure with a core-sheath structure. The makeup remover oil components are stored in the fiber core. While realizing the encapsulation of the makeup remover oil by the fiber, by selecting the spinnable solution, the fiber has the function of forming pores on the fiber surface after encountering water to release the internal components, and has great market application prospects.

Claims

1. A preparation method of a nanofiber membrane material for makeup remover cotton, characterized in that, It includes the following steps: (1) Measure acetone, N,N-dimethylacetamide and ethanol respectively and add them into a screw-cap conical flask. Weigh dry polyvinylpyrrolidone and cellulose acetate powder and add them into the above screw-cap conical flask containing acetone, N,N-dimethylacetamide and ethanol, and stir magnetically to obtain a clear and homogeneous polymer solution; (2) Measure ethanol and makeup remover oil respectively and add them into a screw-cap conical flask. Add polyvinylpyrrolidone powder into the above screw-cap conical flask containing ethanol and makeup remover oil, and stir magnetically to obtain a translucent polymer solution; (3) Use a syringe to extract the polymer solutions in steps (1) and (2) respectively, and place them on the corresponding syringe pumps for the sheath layer and the core layer. Connect the positive pole of the high-voltage power supply to the needle of the coaxial electrospinning head, and connect the negative pole to the aluminum foil with good grounding treatment. Set the coaxial electrospinning parameters, use the aluminum foil as the receiver to receive the nanofibers, turn on the high-voltage power supply, and perform coaxial electrospinning to obtain the nanofiber membrane material for makeup remover cotton, which has a core-sheath structure and the core part is wrapped with makeup remover oil; In step (1), the mass-volume ratio of polyvinylpyrrolidone, cellulose acetate, acetone, N,N-dimethylacetamide and ethanol is 1.0 - 1.2 g : 4.5 - 4.8 g : 10 - 40 ml : 10 - 40 ml : 10 - 40 ml, and the magnetic stirring time is 22 - 24 h; In step (2), the mass-volume ratio of polyvinylpyrrolidone, makeup remover oil and ethanol is 1.0 - 1.3 g : 1.0 - 2.0 ml : 90 - 100 ml; the magnetic stirring time is 22 - 24 h; The electrospinning voltage is 16 - 18 KV, the sheath liquid flow rate is 0.5 - 1.0 ml / h, and the receiving distance is 16 - 18 cm; The core liquid flow rate is twice that of the sheath liquid flow rate.

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