Water-soluble makeup removing material and method for preparing the same

Abstract

The present application relates to the technical field of daily cosmetics, and particularly relates to a water-soluble make-up removing material and a preparation method thereof. The make-up removing material comprises a water-soluble fiber needled felt base material with a three-dimensional porous structure and a solid make-up removing component; the solid make-up removing component is attached to the surface and inside of the pores of the base material; the loading amount of the solid make-up removing component is 5% to 60%; the solid make-up removing component contains an alkyl polyglycoside surfactant, an amino acid surfactant, a humectant and a stabilizer. The preparation method is that the fiber is pretreated by anhydrous finishing, the cotton is mixed and the temperature is controlled, and the low-temperature vacuum cold air drying is performed, so that the water content of the finished product is 0.5% to 5%. The make-up removing material is quickly dissolved and foamed in normal temperature water, has excellent make-up removing power, is completely water-soluble without solid waste after use, and is free of preservatives throughout the whole process.

Description

Technical Field

[0001] This invention relates to the field of daily cosmetics technology, specifically to a water-soluble makeup remover and its preparation method. Background Technology

[0002] Makeup remover pads are an indispensable tool in women's daily skincare routine. Currently, commercially available makeup remover pads are mainly divided into two categories: one is dry makeup remover pads (such as cotton pads), which need to be used in conjunction with makeup remover water, makeup remover oil or makeup remover milk. They have drawbacks such as difficulty in controlling the amount used, inconvenience in carrying, and easy waste. The other is pre-soaked makeup remover wipes, which contain liquid makeup remover. Although they are convenient to use, they have the following problems: (1) In order to maintain the moist state, preservatives, antibacterial agents and other ingredients need to be added, which may irritate the skin if used for a long time; (2) The packaging must be sealed, which is not environmentally friendly and has high cost; (3) The base material is mostly non-water-soluble or difficult-to-degrade materials such as cotton, polyester, and viscose, which generate solid waste after use; (4) The oil components in the makeup remover can easily make the skin feel oily.

[0003] To address the aforementioned product-level deficiencies, existing technologies have been improved from the perspectives of loading methods or formula optimization. For example, patent US11654089B2 discloses a water-soluble polyvinyl alcohol (PVA) wipe, but the substrate has an additional hydrophobic coating to inhibit premature dissolution, and its sheet-like interlayer structure is not conducive to the effective release of makeup-removing ingredients, affecting cleansing and foaming effects. Patent CN113967183A discloses a foaming facial cleansing wipe and its preparation method, which uses chitosan fiber and Tencel fiber to make a spunlace nonwoven fabric base, and then impregnates it with a cleaning composition aqueous solution and dries it at high temperature. It can foam when rubbed with water, and the two have good compatibility. The cleaning composition is effectively loaded on the base fabric, which can inhibit premature dissolution. After contact with water and rubbing, it can produce rich foam. However, after use, the spunlace nonwoven fabric base fabric will produce residual solid waste, which requires high-temperature degradation, and the formula contains a large amount of liquid oils such as coconut oil, resulting in a greasy feel on the skin. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a water-soluble makeup remover material and its preparation method. The material uses a water-soluble fiber needle-punched felt with a three-dimensional porous structure as a substrate. Makeup remover components are loaded onto the substrate in a solid form with a water content ≤10wt%. The substrate is made from room-temperature water-soluble fibers, which are pretreated and needle-punched to form a fluffy structure. The solid makeup remover components include alkyl glycoside surfactants, amino acid surfactants, moisturizers, stabilizers, and solvents. During use, simply adding water and rubbing the cotton pad allows it to quickly dissolve and form rich foam, achieving efficient makeup removal. When not in use, it can be stored stably in an open environment at room temperature. After use, it is completely biodegradable, leaving no solid residue and generating no waste. This solves the problems of existing makeup remover materials, such as substrates that easily generate solid waste, the need for high-temperature degradation, and oily and irritating formulations.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: The purpose of this invention is to provide a water-soluble makeup remover material, comprising a substrate and a solid makeup remover component loaded on the substrate, wherein the loading amount of the solid makeup remover component is 5wt%~60wt%; the substrate is a room-temperature water-soluble fiber needle-punched felt with a three-dimensional porous structure, and the areal density of the room-temperature water-soluble fiber needle-punched felt is 30g / m³. 2 ~300g / m 2 The porosity is ≥30%; the fiber fineness of the room temperature water-soluble fiber is 0.5dtex~5dtex; by weight, the solid makeup remover components include the following components: 40 parts~60 parts alkyl glycoside surfactant, 15 parts~30 parts amino acid surfactant, 3 parts~5 parts moisturizer, 2 parts~8 parts stabilizer, and 1 part~5 parts solvent.

[0006] In a preferred embodiment of the present invention, the method for preparing the substrate includes the following steps: using room temperature water-soluble fiber as raw material, spraying an anhydrous finishing agent solution onto the surface of the room temperature water-soluble fiber, and then forming a fluffy structure through a needle punching process to obtain the substrate.

[0007] In a preferred embodiment of the present invention, the anhydrous finishing agent is anhydrous ethanol, polyethylene glycol, polyglycerol ester or quaternary ammonium salt-61; the spraying time is 0.5h to 3h.

[0008] In a preferred embodiment of the present invention, during the needle-punching process, the temperature of the bulk cotton blend is -5℃ to 5℃, and the ambient humidity is <50%; the needle-punching density is 50 needles / cm². 2 ~400 spines / cm 2 The needle insertion depth is 5mm~15mm.

[0009] In a preferred embodiment of the present invention, the room-temperature water-soluble fiber is at least one of polyvinyl alcohol fiber, sodium alginate fiber, alginate fiber, and sodium carboxymethyl cellulose fiber. The degree of polymerization of the polyvinyl alcohol fiber is 500-700, the molecular weight of the sodium alginate fiber is 300,000-500,000, the molecular weight of the alginate fiber is 300,000-500,000, and the degree of substitution of the sodium carboxymethyl cellulose fiber is 0.6-0.8.

[0010] In a preferred embodiment of the present invention, the water content of the water-soluble makeup remover is 0.5wt% to 5wt%.

[0011] In a preferred embodiment of the present invention, the alkyl glycoside surfactant is at least one of decyl lauryl glucoside, lauryl glucoside, sodium laurate, and sodium laurate salt; the amino acid surfactant is at least one of sodium cocoyl glycinate potassium salt, sodium lauroyl glutamate, sodium cocoyl glycinate, and potassium cocoyl glycinate.

[0012] In a preferred embodiment of the present invention, the humectant is at least one of glycerin, ethylene glycol and polyol, the stabilizer is at least one of starch, cellulose, nanocellulose, paraffin and sorbitol powder, and the solvent is ethanol or polyethylene glycol.

[0013] Another object of the present invention is to provide a method for preparing the above-mentioned water-soluble makeup remover material, comprising the following steps: S1. Using room temperature water-soluble fibers as raw materials, an anhydrous finishing agent solution is sprayed onto the surface of the room temperature water-soluble fibers, followed by opening, bulk blending, fine opening, carding, web forming, and needle punching to form a fluffy structure and obtain the base material.

[0014] S2. Mix alkyl glycoside surfactant, amino acid surfactant, moisturizer and stabilizer in a solvent to form a makeup remover solution.

[0015] S3. After pre-cooling the makeup remover solution, load it onto the substrate, then vacuum dry and cut it into shape to obtain the water-soluble makeup remover material.

[0016] In a preferred embodiment of the present invention, the pre-cooling temperature is 1℃~5℃; the vacuum drying temperature is 0℃~5℃, the vacuum degree is 0.1Pa~3.5Pa, the drying time is 1.2h~20h, and the moisture content after drying is <1wt%.

[0017] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention provides a water-soluble makeup remover material, using a water-soluble fiber needle-punched felt with a three-dimensional porous structure as the substrate. The makeup remover components are loaded onto the substrate in a solid form with a water content ≤10%. The areal density of the water-soluble fiber needle-punched felt at room temperature is 30 g / m³. 2 ~300g / m 2The material has a porosity ≥30%; the fineness of the water-soluble fiber at room temperature is 0.5 dtex~5 dtex; the solid makeup remover components include alkyl glycoside surfactants, amino acid surfactants, moisturizers, stabilizers, and solvents. During use, simply adding water and rubbing the cotton pad allows it to quickly dissolve and form rich foam, achieving dissolution of the makeup remover components in a low-water system. The solvent is then removed by vacuum cold air drying at a low temperature below the glass transition temperature of the fiber. This material avoids the inconvenience of traditional makeup remover oils and cotton pads, and also avoids the skin irritation caused by the additional ingredients added to pre-soaked makeup remover wipes. It thus solves the problems of existing makeup remover materials, such as the base material easily generating solid waste, requiring high-temperature degradation, and the oily and irritating formula.

[0018] 2. The water-soluble makeup remover material provided by this invention uses water-soluble and environmentally friendly materials as its base material and makeup remover components. After use, it dissolves completely in water, leaving no solid residue and no waste discharge, which is in line with the current trend of green and sustainable development.

[0019] 3. In the preparation method of water-soluble makeup remover provided by the present invention, the cold air drying process maintains the complete fiber structure, and the substrate dissolves rapidly within 10 to 60 seconds after contact with water, and the makeup remover components are released instantaneously, generating high-expansion foam, which also has excellent removal effect on waterproof makeup.

[0020] 4. The process of this invention is mild and suitable for large-scale production: the entire process uses an anhydrous system and low-temperature operation, without involving organic solvents, high temperatures or complex equipment. The fibers remain unchanged and do not dissolve during the preparation process, resulting in good product consistency and suitability for industrial production. Detailed Implementation

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] It should be noted that the technical terms used in this invention are only for the purpose of describing specific embodiments and are not intended to limit the scope of protection of this invention. Unless otherwise specified, all raw materials, reagents, instruments and equipment used in the following embodiments of this invention can be purchased from the market or prepared by existing methods.

[0023] Based on this, in one aspect, the present invention provides a water-soluble makeup remover material, comprising a substrate and makeup remover components. The substrate is a fluffy needle-punched felt structure made of water-soluble fibers through a needle-punching process; the makeup remover components are loaded in solid form on the fiber surface and in the pores between the fibers of the substrate.

[0024] The water-soluble makeup remover pads meet the following conditions: (a) It is a solid sheet at room temperature with an overall moisture content of no more than 10 wt%.

[0025] (b) When in use, simply add water and rub; the base material dissolves and releases the makeup remover components within 10 to 60 seconds, forming foam. (c) Before use, it showed no changes in appearance or was not detected by the makeup remover group after being stored in an open environment at room temperature for more than 12 months. (d) It is completely biodegradable after use, with no solid residue and no waste discharge.

[0026] It should be noted that the water-soluble makeup remover material involved in this invention is designed as follows: A loose, non-woven fabric made from room-temperature water-soluble fibers using a needle-punching process is used as the substrate, utilizing its three-dimensional porous structure to load solid makeup remover components. Unlike existing technologies that use liquid wetting agents or emulsion impregnation, this invention employs an anhydrous system to load the makeup remover components onto the surface and pores of the substrate. No water is introduced during the entire preparation process, thus preventing the room-temperature water-soluble fibers from absorbing water and swelling or dissolving prematurely during processing, ensuring the complete preservation of the substrate's three-dimensional structure. In use, simply add water at room temperature and rub; the substrate quickly dissolves and releases the makeup remover components, without the need for heating or other makeup remover products. After use, both the substrate and the makeup remover components are completely dissolved in water, leaving no solid residue. This design differs from traditional makeup remover pads that use the substrate merely as a carrier to mix with the makeup remover, and also differs from US11654089B2, which requires an additional hydrophobic coating to control the dissolution rate.

[0027] Preferably, the moisture content is 0.5wt%~5wt%.

[0028] Preferably, the foam has a foam ratio of not less than 3 times.

[0029] Preferably, the water-soluble fiber includes, but is not limited to, one or more of the following fibers that are water-soluble under certain conditions: polyvinyl alcohol fiber, sodium alginate fiber, sodium carboxymethyl cellulose fiber, etc.

[0030] Preferably, the water-soluble fiber is water-soluble at room temperature, meaning it can dissolve into a liquid state in water at a temperature not exceeding 25°C in 0.1s to 30s, and the fiber fineness is 0.5dtex to 5.0dtex, with a length of 20mm to 80mm.

[0031] Preferably, the areal density of the needle-punched felt is 30 g / m³. 2 ~300g / m 2 The thickness is 0.3mm to 15mm, and the porosity is not less than 30%.

[0032] Preferably, the makeup remover components comprise surfactants, polyol moisturizers, and optional skincare ingredients, and the water content of the makeup remover components is strictly controlled to be less than 10 wt%. The polyol is polyethylene glycol.

[0033] On the other hand, the present invention provides a method for preparing the above-mentioned water-soluble makeup remover material, comprising the following steps: S1. Pretreatment of water-soluble fibers Anhydrous finishing agents are selected, including but not limited to polyglycerol ester systems or quaternary ammonium salt-61 systems, using anhydrous formulations (anhydrous ethanol or polyols can be used as solvents if special needs require them), and the weight fraction of polyglycerol ester system or quaternary ammonium salt-61 system is 0.04wt%~2wt%, preferably 0.8wt%~1.5wt%. Before preparing needle-punched felt, the anhydrous finishing agent is evenly sprayed on the fibers and left to stand for 0.5h~3h.

[0034] The purpose of pretreatment is to prevent problems such as the carding machine being unable to form a web during the needle punching process due to issues like fine fibers and low moisture content.

[0035] S2. Needle-punched felt is produced using conventional needle-punching technology, following the steps of opening, bulk cotton blending, fine opening, carding, web forming, and needle punching. During the bulk cotton blending stage, the blower delivers cold air at a temperature of -5℃ to 5℃. The processing environment is controlled, with the temperature not exceeding 30℃, humidity <50%, and cleanliness meeting cosmetic production requirements. Strict control is maintained to prevent the presence of any metallic foreign objects, and it is especially crucial to ensure that there are no broken needles on or inside the fabric.

[0036] S3, Loading: First, the makeup removal components are evenly dispersed in solvents such as ethanol or polyols to prepare a makeup removal solution. The solution is placed in an environment not exceeding 10°C, ensuring that the temperature of the makeup removal solution does not exceed 5°C. Then, it is quickly applied to the substrate obtained in step S2 by spraying, so that the makeup removal components are evenly distributed on the fiber surface and in the pores.

[0037] S4. Cold air drying step: The substrate obtained in S3 after loading is immediately subjected to vacuum cold air drying at a temperature lower than the glass transition temperature of water-soluble fibers until the overall moisture content is reduced to no more than 1%, and the fibers remain undeformed, undissolved, and have a shrinkage rate of <20% during the drying process.

[0038] S5. Molding step: Cut the dried substrate obtained in step S4 into sheets of predetermined shape and size to obtain the makeup remover cotton pad.

[0039] Preferably, in step S1, the fineness of the water-soluble fiber is 0.5 dtex to 5 dtex and the length is 25 mm to 80 mm. The finer the fiber, the softer and more comfortable the needle-punched felt; the longer the fiber, the higher the strength. More preferably, the fineness is 1.2 dtex to 3 dtex and the length is 35 mm to 55 mm.

[0040] Preferably, in step S1, the water-soluble fiber should be a fiber that is water-soluble at room temperature (not higher than 20~30℃), including but not limited to one or more of the following room-temperature water-soluble fiber materials: water-soluble polyvinyl alcohol, water-soluble sodium alginate fiber, water-soluble alginate fiber, and sodium carboxymethyl cellulose fiber; wherein, the degree of polymerization of polyvinyl alcohol is 600, the degree of alcoholysis is 88%, the molecular weight of sodium alginate and alginate fiber is 300,000~500,000, and the degree of substitution of sodium carboxymethyl cellulose is 0.7. The room-temperature water-soluble fiber can dissolve rapidly in water at 10℃~25℃, with a dissolution time of not more than 40s and not less than 5s, preferably 8s~20s.

[0041] Preferably, in step S2, the needle-punching density of the needle-punching process is 50 needles / cm². 2 ~400 spines / cm 2 The needle-punching depth is 5mm~15mm. The resulting needle-punched fabric has a thickness of 0.3mm~15mm and a surface density of 30g / m³. 2 ~300g / m 2 The porosity of the loose-textured type is not less than 30%.

[0042] Preferably, in step S3, the makeup remover component comprises a makeup remover, a surfactant, a moisturizer, and optional skincare ingredients, and the water content of the makeup remover component is strictly controlled to be less than 10 wt%. The makeup remover includes, but is not limited to, alkyl polyglucosides (APG) in the form of 40-60 parts, amino acid surfactants (one or more of sodium cocoyl glycinate, sodium lauroyl glutamate, sodium cocoyl glycinate, or potassium cocoyl glycinate) in the form of 15-30 parts, moisturizers (including but not limited to one or more of glycerin, ethylene glycol, polyols, etc.) in the form of 3-5 parts, solvents not exceeding 5 parts, and stabilizers (including but not limited to one or more of starch, cellulose, nanocellulose, paraffin, sorbitol powder, etc.) in the form of 2-8 parts. The makeup remover has a foaming rate of not less than 3, and the makeup remover component is mild and non-irritating, forming a rich foam upon contact with a small amount of water.

[0043] Preferably, in step S4, the temperature of the cold air drying is 0℃~5℃, the vacuum degree is 0.1Pa~3.5Pa, the drying time is 1.2h~20h, and the drying is continued until the moisture content is <1wt%.

[0044] The following specific examples will provide further explanation.

[0045] Example 1 A method for preparing a water-soluble makeup remover material includes the following steps: (1) An anhydrous finishing agent was prepared by dissolving 0.9% polyglycerol-10 laurate in anhydrous ethanol as a solvent. The finishing agent was sprayed evenly onto the surface of water-soluble polyvinyl alcohol with a fineness of 1.5 dtex and a length of 40 mm, and then sealed and left to stand for 2 hours to obtain pretreated water-soluble polyvinyl alcohol.

[0046] (2) The pretreated water-soluble polyvinyl alcohol is sequentially subjected to opening, bulk blending, fine opening, carding, web forming, and needle punching processes to prepare a water-soluble fiber nonwoven fabric. In the bulk blending stage, a fan is used to blow cold air at a temperature of 2°C and an ambient humidity of 20%. The needle punching density in the needle punching process is 90 needles / cm². 2 The needle-punching depth is 10 mm; the resulting needle-punched fabric has a thickness of 3 mm and a surface density of 72 g / m³. 2 It has a fluffy structure and a porosity of 47%.

[0047] (3) Take 45 parts by weight of decyl lauryl glucoside, 25 parts of sodium potassium cocoyl glycinate, 5 parts of glycerin and 5 parts of cellulose, mix them evenly and disperse them in 100 mL of ethanol solvent to prepare a makeup removal solution; place the makeup removal solution in a 3°C environment for pre-cooling, and then apply it quickly to the nonwoven fabric substrate obtained in step (2) by spraying, so that the makeup removal components are evenly distributed on the fiber surface and inside the pores, and obtain a substrate loaded with makeup removal components.

[0048] (4) The substrate loaded with makeup remover components was immediately transferred to a vacuum freeze-drying condition of 1°C and 1Pa for 15 hours. After drying, the overall moisture content was reduced to no more than 1%, and the fibers remained undeformed and undissolved during the drying process, with a shrinkage rate of 5%.

[0049] (5) Cut the dried substrate obtained in step (4) into 5cm×5cm sheet products to obtain room temperature water-soluble makeup remover cotton, i.e. water-soluble makeup remover material.

[0050] Example 2 A method for preparing a water-soluble makeup remover material includes the following steps: (1) An anhydrous finishing agent was prepared by dissolving 1.2% (w / w) of 2-methacryloyloxyethyl phosphocholine in anhydrous ethanol. The finishing agent was then sprayed evenly onto the surface of water-soluble sodium alginate fibers with a fineness of 2 dtex and a length of 45 mm. The fibers were then sealed and left to stand for 1.5 hours to obtain pretreated water-soluble sodium alginate fibers.

[0051] (2) The pretreated water-soluble sodium alginate fibers are sequentially subjected to opening, bulk blending, fine opening, carding, web forming, and needle punching processes to prepare a water-soluble fiber nonwoven fabric. During the bulk blending stage, a fan is used to blow cold air at a temperature of 2°C and an ambient humidity of 25%. The needle punching density during the needle punching process is 80 needles / cm². 2 The needle-punching depth was 11 mm; the resulting needle-punched fabric had a thickness of 4.5 mm and a surface density of 66 g / m³. 2 It has a fluffy structure and a porosity of 53%.

[0052] (3) Take 40 parts sodium lauryl 25 parts sodium lauroyl glutamate, 3 parts glycerin and 5 parts starch by weight, mix them evenly and disperse them in 100 mL ethanol solvent to prepare a makeup removal solution; place the makeup removal solution in an environment of 1°C for pre-cooling, and then apply it quickly to the non-woven fabric substrate obtained in step (2) by spraying, so that the makeup removal components are evenly distributed on the fiber surface and inside the pores, and obtain a substrate loaded with makeup removal components.

[0053] (4) The substrate loaded with makeup remover components was immediately transferred to a vacuum freeze-drying environment with a temperature of 1°C and a vacuum degree of 1.5Pa for 10 hours. After drying, the overall moisture content was reduced to no more than 1%, and the fibers remained undeformed and undissolved during the drying process, with a shrinkage rate of 7%.

[0054] (5) Cut the dried substrate obtained in step (4) into 5cm×5cm sheet products to obtain room temperature water-soluble makeup remover cotton, i.e. water-soluble makeup remover material.

[0055] Example 3 A method for preparing a water-soluble makeup remover material includes the following steps: (1) Polyglycerol was used as a solvent to dissolve 1.5% polyglycerol-3 octanoate to prepare an anhydrous finishing agent. The finishing agent was sprayed evenly onto the surface of sodium carboxymethyl cellulose fibers with a fineness of 2.5 dtex and a length of 50 mm, and then sealed and left to stand for 1 hour to obtain pretreated sodium carboxymethyl cellulose fibers.

[0056] (2) Pretreated sodium carboxymethyl cellulose fibers are sequentially subjected to opening, bulk blending, fine opening, carding, web forming, and needle punching processes to prepare a water-soluble fiber nonwoven fabric. In the bulk blending stage, a fan is used to blow cold air at a temperature of 2°C and an ambient humidity of 25%. The needle punching density in the needle punching process is 60 needles / cm². 2 The needle-punching depth was 11 mm; the resulting needle-punched fabric had a thickness of 6 mm and a surface density of 59 g / m³. 2 It has a fluffy structure and a porosity of 58%.

[0057] (3) Take 40 parts lauryl glucoside, 25 parts sodium cocoyl glycinate, 3 parts ethylene glycol, and 5 parts sorbitol powder by weight, mix them evenly and disperse them in 100 mL of polyethylene glycol solvent to prepare a makeup remover solution; place the makeup remover solution in an environment of 1°C for pre-cooling, and then apply it quickly to the nonwoven fabric substrate obtained in step (2) by spraying, so that the makeup remover components are evenly distributed on the fiber surface and inside the pores, and obtain a substrate loaded with makeup remover components.

[0058] (4) The substrate loaded with makeup remover components was immediately transferred to a vacuum freeze-drying environment at a temperature of 2°C and a vacuum degree of 1.8Pa for 13 hours. After drying, the overall moisture content was reduced to no more than 1%, and the fibers remained undeformed and undissolved during the drying process, with a shrinkage rate of 8%.

[0059] (5) Cut the dried substrate obtained in step (4) into 5cm×5cm sheet products to obtain room temperature water-soluble makeup remover cotton, i.e. water-soluble makeup remover material.

[0060] Example 4 A method for preparing a water-soluble makeup remover material includes the following steps: (1) Polyethylene glycol was used as a solvent to dissolve 1.1% polyglycerol-10 laurate to prepare an anhydrous finishing agent. The finishing agent was sprayed evenly onto the surface of water-soluble polyvinyl alcohol fibers with a fineness of 3dtex and a length of 55mm, and then sealed and left to stand for 2.5 hours to obtain pretreated water-soluble polyvinyl alcohol fibers.

[0061] (2) The pretreated water-soluble polyvinyl alcohol fibers are sequentially subjected to opening, bulk blending, fine opening, carding, web forming, and needle punching processes to prepare a water-soluble fiber nonwoven fabric. During the bulk blending stage, a fan is used to blow cold air at a temperature of 2°C and an ambient humidity of 30%. The needle punching density during the needle punching process is 85 needles / cm². 2 The needle-punching depth was 12 mm; the resulting needle-punched fabric had a thickness of 4.1 mm and a surface density of 72 g / m³. 2 It has a relatively dense structure with a porosity of 43%.

[0062] (3) Take 45 parts sodium lauryl salt, 20 parts sodium cocoyl glycinate, 3 parts polyol and 5 parts nanocellulose by weight, mix them evenly and disperse them in 100 mL polyethylene glycol solvent to prepare a makeup removal solution; place the makeup removal solution in an environment of 1°C for pre-cooling, and then apply it quickly to the nonwoven fabric substrate obtained in step (2) by spraying, so that the makeup removal components are evenly distributed on the fiber surface and inside the pores, and obtain a substrate loaded with makeup removal components.

[0063] (4) The substrate loaded with makeup remover components was immediately transferred to a temperature of 1°C and a vacuum of 2Pa for vacuum freeze drying for 15 hours. After drying, the overall moisture content was reduced to no more than 1%, and the fibers remained undeformed and undissolved during the drying process, with a shrinkage rate of 6%.

[0064] (5) Cut the dried substrate obtained in step (4) into 5cm×5cm sheet products to obtain room temperature water-soluble makeup remover cotton, i.e. water-soluble makeup remover material.

[0065] Example 5 A method for preparing a water-soluble makeup remover material includes the following steps: (1) An anhydrous finishing agent was prepared by dissolving 1.2% (w / w) of 2-methacryloyloxyethyl phosphocholine in anhydrous ethanol. The finishing agent was then sprayed evenly onto the surface of water-soluble sodium alginate fibers with a fineness of 2 dtex and a length of 45 mm. The fibers were then sealed and left to stand for 1 hour to obtain pretreated water-soluble sodium alginate fibers.

[0066] (2) The pretreated water-soluble sodium alginate fibers were sequentially subjected to opening, bulk blending, fine opening, carding, web forming, and needle punching processes to prepare a water-soluble fiber nonwoven fabric. During the bulk blending stage, a fan was used to blow cold air at a temperature of 2°C and an ambient humidity of 35%. The needle punching density during the needle punching process was 80 needles / cm². 2 The needle-punching depth was 11 mm; the resulting needle-punched fabric had a thickness of 4.5 mm and a surface density of 66 g / m³. 2 It has a fluffy structure and a porosity of 53%.

[0067] (3) Take 45 parts sodium lauryl salt, 30 parts potassium cocoyl glycinate, 5 parts glycerin and 5 parts nanocellulose by weight, mix them evenly and disperse them in 100 mL ethanol solvent to prepare a makeup removal solution; place the makeup removal solution in an environment of 1°C for pre-cooling, and then apply it quickly to the nonwoven fabric substrate obtained in step (2) by spraying, so that the makeup removal components are evenly distributed on the fiber surface and inside the pores, and obtain a substrate loaded with makeup removal components.

[0068] (4) The substrate loaded with makeup remover components was immediately transferred to a vacuum freeze-drying environment with a temperature of 1°C and a vacuum degree of 1.5Pa for 10 hours. After drying, the overall moisture content was reduced to no more than 1%, and the fibers remained undeformed and undissolved during the drying process, with a shrinkage rate of 7%.

[0069] (5) Cut the dried substrate obtained in step (4) into 5cm×5cm sheet products to obtain room temperature water-soluble makeup remover cotton, i.e. water-soluble makeup remover material.

[0070] Example 6 A method for preparing a water-soluble makeup remover material includes the following steps: (1) Polyglycerol was used as a solvent to dissolve 1.5% polyglycerol-3 octanoate to prepare an anhydrous finishing agent. The finishing agent was sprayed evenly onto the surface of sodium carboxymethyl cellulose fibers with a fineness of 2.5 dtex and a length of 50 mm, and then sealed and left to stand for 1.5 hours to obtain pretreated sodium carboxymethyl cellulose fibers.

[0071] (2) Pretreated sodium carboxymethyl cellulose fibers are sequentially subjected to opening, bulk blending, fine opening, carding, web forming, and needle punching processes to prepare a water-soluble fiber nonwoven fabric. In the bulk blending stage, a fan is used to blow cold air at a temperature of 2°C and an ambient humidity of 30%. The needle punching density in the needle punching process is 50 needles / cm². 2 The needle-punching depth was 12 mm; the resulting needle-punched fabric had a thickness of 6.5 mm and a surface density of 53 g / m³. 2 It has a fluffy structure and a porosity of 67%.

[0072] (3) Take 25 parts by weight of decyl lauryl glucoside, 25 parts of lauryl glucoside, 15 parts of sodium cocoyl glycinate, 3 parts of glycerin, and 5 parts of paraffin. Mix them evenly and disperse them in 100 mL of polyethylene glycol solvent to prepare a makeup remover solution. Place the makeup remover solution in an environment of 1°C for pre-cooling, and then apply it quickly to the nonwoven fabric substrate obtained in step (2) by spraying, so that the makeup remover components are evenly distributed on the fiber surface and inside the pores to obtain a substrate loaded with makeup remover components.

[0073] (4) The substrate loaded with makeup remover components was immediately transferred to a vacuum freeze-drying environment at a temperature of 2°C and a vacuum degree of 1.8Pa for 13 hours. After drying, the overall moisture content was reduced to no more than 1%, and the fibers remained undeformed and undissolved during the drying process, with a shrinkage rate of 8%.

[0074] (5) Cut the dried substrate obtained in step (4) into 5cm×5cm sheet products to obtain room temperature water-soluble makeup remover cotton, i.e. water-soluble makeup remover material.

[0075] Comparative Example 1 The difference from Example 1 is that the water-soluble polyvinyl alcohol fiber in step (1) is not sprayed with any finishing agent and subjected to closed static treatment, and directly enters the needle punching process in step (2).

[0076] Because this comparative example was not treated with any finishing agent, the fibers exhibited severe static electricity, fly waste, and roller entanglement during the carding machine web-forming stage, making it impossible to form a uniform fiber web with extremely uneven thickness and porosity.

[0077] Comparative Example 2 The difference from Example 2 is that the processing environment humidity in step (2) is increased to 85%, and the temperature of the cold air blown by the fan in the cotton blending stage is increased to 15°C.

[0078] In this comparative example, because water-soluble sodium alginate fiber is hygroscopic, high humidity and high temperature wind speed accelerate the absorption of moisture by the fiber, the fiber surface becomes soft and sticky, and the fiber is prone to excessive entanglement, resulting in uneven loading of makeup removal components, which leads to increased dissolution time and poor makeup removal ability.

[0079] Comparative Example 3 The difference from Example 3 is that the makeup removal solution prepared in step (3) is not pre-cooled and is directly sprayed onto the substrate.

[0080] Because the temperature was high when spraying at room temperature, the solvent evaporated quickly, resulting in uneven loading of makeup remover ingredients, reduced foam ratio, and poorer makeup removal ability.

[0081] Comparative Example 4 The difference from Example 4 is that the water-soluble polyvinyl alcohol fiber in step (1) is replaced with ordinary hot water-soluble polyvinyl alcohol fiber (dissolution temperature ≥70℃).

[0082] Because hot water soluble polyvinyl alcohol fibers are almost insoluble at room temperature, the fibers cannot be dissolved at room temperature, leaving fiber residue after use, resulting in extremely poor makeup removal ability.

[0083] Comparative Example 5 The difference from Example 1 is that in step (3), 10 parts by weight of decyl lauryl glucoside, 5 parts of sodium potassium cocoyl glycinate, 5 parts of glycerin and 15 parts of cellulose are mixed evenly and dispersed in 100 mL of ethanol solvent to prepare a makeup remover solution. The makeup remover solution is pre-cooled in an environment of 3°C and then applied quickly to the nonwoven fabric substrate obtained in step (2) by spraying, so that the makeup remover components are evenly distributed on the fiber surface and inside the pores.

[0084] Due to a severe deficiency in the amount of surfactant added, the foaming ability of this comparative sample was greatly reduced, making it unable to effectively emulsify makeup and significantly reducing its makeup removal ability.

[0085] Comparative Example 6 The difference from Example 6 is that 10 parts of water were added to the makeup remover prepared in step (3).

[0086] The additional water added in this comparison ratio will cause the water-soluble sodium carboxymethyl cellulose fibers to absorb water and swell prematurely or even partially dissolve during spraying, damaging the three-dimensional fluffy structure of the nonwoven fabric and resulting in a significant decrease in makeup removal ability.

[0087] Comparative Example 7 The difference from Example 1 is that in step (4), the substrate loaded with makeup remover components is placed in a regular hot air oven at 50°C and dried for 8 hours instead of using low-temperature vacuum drying.

[0088] This comparative example uses high-temperature hot air drying, which causes rapid evaporation of moisture, leading to an increase in fiber surface temperature. After drying, the fibers stick together, the structure collapses, and the shrinkage rate is greater than 50%.

[0089] The dissolution time, foam ratio, and makeup removal ability of the room temperature water-soluble makeup remover pads of Examples 1 to 6 and Comparative Examples 1 to 7 were tested.

[0090] The test method for the solubility of room temperature water-soluble makeup remover pads is as follows: Take a makeup remover pad with a known mass m0 and place it in a conical flask of 100mL pure water at 25℃. After tightening the stopper, oscillate back and forth at a frequency of 120 times / minute to simulate the cleaning process. At the same time, record the disintegration time t1 when the sample completely loses its sheet-like structure and the fibers begin to disperse, and the complete dissolution time t2 when no visible fibers or blocky solid residues remain.

[0091] The foam ratio test uses the graduated cylinder method: Take a makeup remover cotton pad, dissolve it in pure water at 25℃ to prepare 20mL of test solution, transfer it to a 200mL graduated cylinder, tighten the stopper and shake it up and down 30 times at a frequency of 2 times / second, and immediately read the total volume V1 of the foam and liquid mixture; take an equal amount of test solution in the same graduated cylinder and read the original liquid volume V2. Calculate the foam ratio as a percentage using the following formula: Foam ratio = V1 / V2.

[0092] The makeup removal ability of makeup remover pads is tested according to T / BDCA 0003-2025 "Guidelines for evaluating the makeup removal ability of makeup remover oils". The makeup removal power of makeup remover pads is measured by in vitro method and evaluated according to the makeup removal ability evaluation method.

[0093] Table 1 shows the performance test results of different makeup remover pads. As can be seen from Table 1, the room-temperature water-soluble makeup remover pads prepared according to this invention possess good water solubility, foaming efficiency, and makeup removal ability. Specifically:

[0094] Comparative Example 1 did not undergo makeup removal performance testing because the fibers were not pretreated with an anhydrous finishing agent, resulting in severe static electricity, fly waste, and roller entanglement during the carding and web forming stage, making it impossible to form a uniform fiber web.

[0095] The difference between Comparative Example 2 and Example 2 lies in the increased processing humidity to 85% and the increased cold air temperature of the cotton blend in the warehouse to 15°C. Under high humidity, the sodium alginate fiber surface absorbs moisture and swells, leading to excessive entanglement of the fibers during needle punching. This results in a decreased loose structure and porosity of the substrate, causing uneven loading of makeup remover components and hindered water penetration during use. Comparative Example 2 exhibited a significantly prolonged dissolution time (t1 = 25 s, t2 = 65 s), a reduced foam ratio to 180%, and a makeup removal ΔE value of 2.5–5.4, all significantly inferior to Example 2 (t1 = 7 s, t2 = 21 s, foam ratio 390%, ΔE ≤ 1.9).

[0096] The difference between Comparative Example 3 and Example 3 is that the makeup remover solution was not pre-cooled and was sprayed directly at room temperature. At room temperature, the solvent evaporates quickly, causing the makeup remover components to precipitate prematurely on the fiber surface and fail to fully penetrate the pores of the substrate, resulting in uneven loading. The dissolution time of Comparative Example 3 (t1 = 19s, t2 = 48s) was longer than that of Example 3 (t1 = 5s, t2 = 16s), the foam ratio was only 210% (compared to 450% in Example 3), and the makeup removal ΔE value was 2.2~4.7, significantly inferior to Example 3 (ΔE ≤ 1.7).

[0097] Comparative Example 4 replaced the room-temperature water-soluble polyvinyl alcohol fiber with a hot-water-soluble fiber (dissolution temperature ≥70℃). In water at 25℃, the fiber only swelled slightly and could not dissolve, the matrix skeleton remained intact, and the makeup removal components could not be effectively released. The disintegration time of Comparative Example 4 was as long as 227 seconds, and it could not be completely dissolved. The foam ratio was only 50%, and the makeup removal ΔE value was as high as 5.9~9.1, which basically did not have practical makeup removal ability.

[0098] The difference between Comparative Example 5 and Example 1 is that the total amount of surfactant was reduced from 70 parts to 15 parts, while the amount of stabilizer was increased from 5 parts to 15 parts. The surfactant content was severely insufficient, and the effective micelle concentration in the solution was far below the critical micelle concentration, making it unable to effectively encapsulate and solubilize oily makeup. The foam ratio of Comparative Example 5 was only 120%, and the makeup removal ΔE value was 3.8~7.2, both significantly worse than Example 1 (foam ratio 420%, ΔE ≤ 1.8).

[0099] The difference between Comparative Example 6 and Example 6 is that 10 parts of water were added to the makeup remover solution. The water-based makeup remover caused the surface of the sodium carboxymethyl cellulose fibers to swell and even partially dissolve during spraying, leading to fiber adhesion and disruption of the three-dimensional, fluffy structure of the substrate. Comparative Example 6 showed a significantly prolonged dissolution time (t1: 22 s, t2: 58 s), a reduced foam ratio to 175%, and a makeup removal ΔE value of 3.2–6.2, all inferior to Example 6 (t1: 3 s, t2: 12 s, foam ratio 525%, ΔE ≤ 2.1).

[0100] The difference between Comparative Example 7 and Example 1 is that a 50°C hot air oven was used instead of a low-temperature vacuum dryer. The high temperature caused the solvent to be rapidly removed from the fiber surface, leading to fiber shrinkage, collapse, and adhesion. The substrate shrinkage exceeded 50%, and the three-dimensional fluffy structure was destroyed. The dissolution time of Comparative Example 7 (t1 = 34 s, t2 = 45 s) was longer than that of Example 1 (t1 = 6 s, t2 = 18 s), the foam ratio was only 195%, and the makeup removal ΔE value was 3.1~7.6, all significantly inferior to Example 1.

[0101] Table 1 Performance test results of different makeup remover pads It should be noted that when numerical ranges are involved in this invention, it should be understood that both endpoints of each numerical range, as well as any value between the two endpoints, can be selected. Since the steps and methods used are the same as in the embodiments, preferred embodiments are described here to avoid redundancy. Although preferred embodiments of this invention have been described, those skilled in the art, once they understand the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended scope of protection is intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of this invention.

[0102] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of protection of this invention and its equivalents, this invention also intends to include these modifications and variations.

Claims

1. A water-soluble makeup remover, characterized in that, The water-soluble makeup remover material comprises a substrate and solid makeup remover components loaded on the substrate, wherein the loading amount of the solid makeup remover components is 5wt%~60wt%; the substrate is a room-temperature water-soluble fiber needle-punched felt with a three-dimensional porous structure, and the areal density of the room-temperature water-soluble fiber needle-punched felt is 30g / m³. 2 ~300g / m 2 Porosity ≥30%; the fineness of the room temperature water-soluble fiber is 0.5dtex~5dtex; By weight, the solid makeup remover components include the following: 40 to 60 parts alkyl glycoside surfactant, 15 to 30 parts amino acid surfactant, 3 to 5 parts moisturizer, 2 to 8 parts stabilizer, and 1 to 5 parts solvent.

2. The water-soluble makeup remover material according to claim 1, characterized in that, The method for preparing the substrate includes the following steps: Using room-temperature water-soluble fibers as raw materials, an anhydrous finishing agent solution is sprayed onto the surface of the room-temperature water-soluble fibers, and then a fluffy structure is formed by needle punching to obtain the substrate.

3. The water-soluble makeup remover material according to claim 2, characterized in that, The anhydrous finishing agent is anhydrous ethanol, polyethylene glycol, polyglycerol ester, or quaternary ammonium salt-61; the spraying time is 0.5h to 3h.

4. The water-soluble makeup remover material according to claim 2, characterized in that, During the needle-punching process, the temperature of the cotton blend in the warehouse is -5℃ to 5℃, and the ambient humidity is <50%; the needle-punching density is 50 needles / cm². 2 ~400 spines / cm 2 The needle insertion depth is 5mm~15mm.

5. The water-soluble makeup remover material according to claim 1, characterized in that, The room-temperature water-soluble fiber is at least one of polyvinyl alcohol fiber, sodium alginate fiber, alginate fiber, and sodium carboxymethyl cellulose fiber. The degree of polymerization of polyvinyl alcohol fiber is 500-700, the molecular weight of sodium alginate fiber is 300,000-500,000, the molecular weight of alginate fiber is 300,000-500,000, and the degree of substitution of sodium carboxymethyl cellulose fiber is 0.6-0.

8.

6. The water-soluble makeup remover material according to claim 1, characterized in that, Water-soluble makeup remover materials have a water content of 0.5wt% to 5wt%.

7. The water-soluble makeup remover material according to claim 1, characterized in that, The alkyl glycoside surfactant is at least one of decyl lauryl glucoside, lauryl glucoside, sodium laurate, and sodium laurate salt; the amino acid surfactant is at least one of sodium cocoyl glycinate, sodium lauroyl glutamate, sodium cocoyl glycinate, and potassium cocoyl glycinate.

8. The water-soluble makeup remover material according to claim 1, characterized in that, The humectant is at least one of glycerin, ethylene glycol and polyethylene glycol; the stabilizer is at least one of starch, cellulose, nanocellulose, paraffin and sorbitol powder; and the solvent is ethanol or polyethylene glycol.

9. A method for preparing a water-soluble makeup remover material according to any one of claims 1 to 8, characterized in that, Includes the following steps: Using room temperature water-soluble fibers as raw materials, an anhydrous finishing agent solution is sprayed onto the surface of the room temperature water-soluble fibers, followed by opening, bulk blending, fine opening, carding, web forming, and needle punching to form a fluffy structure and obtain the base material; Alkyl glycoside surfactants, amino acid surfactants, moisturizers, and stabilizers are mixed and dissolved in a solvent to form a makeup remover solution; The makeup remover solution is pre-cooled and loaded onto a substrate, then vacuum dried and cut to shape to obtain a water-soluble makeup remover material.

10. The method for preparing the water-soluble makeup remover material according to claim 9, characterized in that, The pre-cooling temperature is 1℃~5℃; the vacuum drying temperature is 0℃~5℃, the vacuum degree is 0.1Pa~3.5Pa, the drying time is 1.2h~20h, and the moisture content after drying is <1wt%.

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