Moisturizing skin-care paint, preparation method thereof and disposable moisturizing elastic gloves

Abstract

The invention discloses a moisturizing skin-care coating, a preparation method thereof and disposable moisturizing elastic gloves. Based on the total weight of the coating, the moisturizing and skin care coating comprises 2.65 wt%-3.50 wt% of a chitosan solution; from 85.40 wt% to 86.20 wt% of a moisturizing solution; from 11.10 wt% to 11.25 wt% of an auxiliary agent; wherein the chitosan solution is formed by dissolving chitosan of which the N-ethyl removal rate reaches 55% or above and the density reaches 0.3 g / ml or above in an acidic aqueous solution, and the acidic aqueous solution is a solution of which the pH value is less than 6.5 and which is formed by dissolving organic acid in deionized water; the moisturizing solution comprises a carrier solution and at least one moisturizing agent; the auxiliary agent comprises cellulose. By means of a solution formed by chitosan and organic acid, the moisturizing and skin care coating is evenly dispersed in the glove, one-time wearing experience is provided, and the moisturizing and skin care effects are achieved.

Description

Technical Field

[0001] The present invention relates to a moisturizing skin care coating and a preparation method thereof, and also relates to a disposable moisturizing elastic glove coated with the moisturizing skin care coating. The present invention belongs to the technical field of chemical engineering. Background Art

[0002] Disposable elastic gloves, including medical gloves, are widely used as a protective measure during work, by wearing gloves to isolate the hand from the object to be processed. In order to facilitate the handling of objects, disposable elastic gloves are usually made of thin and elastic materials, which can provide "comfort and good fit" for the wearer's hand, allowing the wearer to wear them for a long time to perform work. However, due to the non-breathable glove material, sweating of the hands is a common problem for wearers. Moreover, after long-term wearing, the glove material will closely adhere to the hand skin to produce a hydration effect, which will damage the protection provided by the skin cutin layer, and cause the hand skin to sweat and form a wet phenomenon. In addition to causing the wearer's hand skin to become extremely dry and sensitive, in severe cases, it will lead to infections, and ultimately extend to more serious skin diseases.

[0003] To solve the above problems, currently, U.S. Patent No. 5,614,202 discloses a moisturizing glove, which includes an intermediate layer having an emulsion or cream, that is, the intermediate layer allows the emulsion to pass through and contact the user's hand skin through its porous inner layer design; another U.S. Patent No. 5,869,072 discloses a therapeutic skin moisturizing glove, which includes a glove body formed with a porous inner layer, and a mixture (including a certain amount of polyvinyl alcohol, water, moisturizing cream and vitamins) is impregnated and applied to the porous inner layer and pores of the glove body and cured.

[0004] The aforementioned U.S. patents all impregnate skin care ingredients in the inner layer of the glove in order to expect to play a skin care and moisturizing role on the hand skin. However, oily emollients are used in emulsions and creams. In addition to the fact that they are prone to cause an uncomfortable greasy feeling on the skin itself, coating on the inner surface of disposable gloves may also cause the "wet phase" of the gloves and potential adhesion on the "glove wearing surface" (i.e., the inner surface in contact with the skin), thereby making the gloves cause the inconvenience of "wearing hindrance".

[0005] Therefore, in the field of disposable medical or non-medical gloves, it is necessary to improve their overall integrity, user comfort and convenience. More difficultly, while meeting these physical and comfort characteristics, it is also necessary to have convenient wearability and beneficial repair and skin-friendly effects, and retain the characteristics and functionality of medical / non-medical gloves. Summary of the Invention

[0006] In view of the above situation, one of the objectives of the present invention is to provide a moisturizing skin care coating and a preparation method thereof. By providing a chitosan solution formed by dissolving chitosan with more than 55% of N-ethyl removed in an aqueous citric acid solution, the chitosan is uniformly dispersed in the moisturizing skin care coating, so that when the moisturizing skin care coating is disposed on the inner surface of a disposable moisturizing elastic glove and contacts the hand skin, it can effectively provide a moisturizing function.

[0007] Another objective of the present invention is to provide a disposable moisturizing elastic glove to overcome the problems that the inner surface of the existing disposable elastic glove does not have a moisturizing component, resulting in excessive dryness of the hand skin, or using lotion or cream as the moisturizing component, resulting in sticky hand skin and inconvenient wearing.

[0008] Specifically, a moisturizing skin care coating provided by the present invention, calculated based on the total weight of the coating, comprises: 2.65 wt% to 3.50 wt% of a chitosan solution; 85.40 wt% to 86.20 wt% of a moisturizing solution; 11.10 wt% to 11.25 wt% of an auxiliary agent; wherein, the chitosan solution is formed by dissolving chitosan with an N-ethyl removal rate reaching more than 55% and a density reaching more than 0.3 g / ml in an acidic aqueous solution, and the acidic aqueous solution is a solution with a pH value less than 6.5 formed by dissolving an organic acid in deionized water; the moisturizing solution contains a carrier solution and at least one moisturizing agent.

[0009] Specifically, the N-ethyl removal rate of the chitosan can be more than 55%. Preferably, the N-ethyl removal rate of the chitosan can be 55% to 95%. More preferably, the N-ethyl removal rate of the chitosan can be 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90% or 95%, and the N-ethyl removal rate of the chitosan can be within the range formed by any two of the above values, but not limited thereto.

[0010] Specifically, the density of the chitosan can reach more than 0.3 g / ml. Preferably, the density of the chitosan can be 0.3 g / ml to 0.6 g / ml. More preferably, the density of the chitosan can be 0.3 g / ml, 0.35 g / ml, 0.4 g / ml, 0.5 g / ml or 0.6 g / ml, and the density of the chitosan can be within the range formed by any two of the above values, but not limited thereto.

[0011] According to an embodiment of the present invention, the organic acid can be selected from formic acid, acetic acid, adipic acid, lactic acid, citric acid, malic acid, propionic acid or succinic acid.

[0012] In one embodiment of the present invention, the organic acid is preferably citric acid. Citric acid is a weak organic acid belonging to the category of polybasic acids; since polybasic acids refer to acids having multiple hydrogen atoms that can be released, when citric acid is put into water, citric acid will gradually ionize, that is, gradually lose its hydrogen atoms, thereby forming hydrated ions (H 3 O + ) in the solution of citric acid mixed with water. Chitosan is a weak basic substance, insoluble in water and organic solvents, but chitosan is soluble in a weakly acidic aqueous solution with a pH value less than 6.5. This is because chitosan is composed of glucosamine (a derivative of sugar). In an acidic environment with a pH value less than 6.5, since the acid imparts some additional polarity or charge to the glucosamine units, these glucosamine units can be transformed into a form that can be dissolved in water, thus more easily interacting with water molecules and effectively improving the solubility of chitosan. Therefore, due to the dissolution and protonation processes of chitosan in the citric acid aqueous solution, the original intermolecular and intramolecular hydrogen bonds of chitosan will be disrupted, and the molecular chains of chitosan will change by cross-linking with citric acid, so that the solubility of chitosan in the citric acid aqueous solution is better than that in other weakly acidic aqueous solutions.

[0013] In one embodiment of the present invention, when the organic acid aqueous solution is a citric acid aqueous solution, the concentration of the citric acid aqueous solution can be 1.5 wt% to 17.5 wt%, and the weight ratio of chitosan to citric acid can be 1:4 to 1:1.

[0014] Specifically, the citric acid aqueous solution is prepared by mixing citric acid with deionized water. The concentration of the citric acid aqueous solution can be 1.5 wt%, 3.5 wt%, 5.5 wt%, 7.5 wt%, 9.5 wt%, 11.5 wt%, 13.5 wt%, 15.5 wt% or 17.5 wt%; the concentration of the citric acid aqueous solution can be within the range formed by any two of the above values, but is not limited thereto.

[0015] Specifically, the weight ratio of chitosan to citric acid is 1:4, 1:3, 1:2 or 1:1, and the weight ratio of chitosan to citric acid can be within the range formed by any two of the above values, but is not limited thereto.

[0016] According to an embodiment of the present invention, the steps of the preparation method of the moisturizing skin care coating include:

[0017] Chitosan with an N-ethyl removal rate of over 55% and a density of over 0.3 g / ml is added to an aqueous citric acid solution, and stirred until the chitosan is mixed and dissolved to obtain a chitosan solution; the concentration of the aqueous citric acid solution is 1.5 wt% to 17.5 wt%, and the weight ratio of the chitosan to citric acid is 1:4 to 1:1.

[0018] A carrier solution and at least one humectant are provided, and a moisturizing solution formed by the carrier solution and the humectant is added to the chitosan solution, and after stirring, a mixed solution is obtained.

[0019] At least one auxiliary agent is provided, and the auxiliary agent is added to the mixed solution one by one, and stirred until the auxiliary agent is mixed and dissolved in the mixed solution to obtain a moisturizing skin care coating.

[0020] Among them, calculated based on the total weight of the skin care and moisturizing material, the skin care and moisturizing material contains 2.65 wt% to 3.50 wt% of the chitosan solution, 85.40 wt% to 86.20 wt% of the moisturizing solution, and 11.10 wt% to 11.25 wt% of the auxiliary agent.

[0021] According to an embodiment of the present invention, the humectant is selected from one or a combination of two or more of glycerol, sorbitol, and dimethicone.

[0022] In one embodiment of the present invention, the humectant contains glycerol. In another embodiment of the present invention, the moisturizing contains glycerol and sorbitol. In still another embodiment of the present invention, the humectant contains glycerol and dimethicone. In yet another embodiment of the present invention, the humectant contains glycerol, sorbitol, and dimethicone.

[0023] In one embodiment of the present invention, calculated based on the total weight of the moisturizing skin care coating, the addition ratio of the glycerol can be 0.05 wt% to 0.30 wt%; preferably 0.10 wt% to 0.20 wt%. In one embodiment of the present invention, calculated based on the total weight of the moisturizing skin care coating, the addition ratio of the sorbitol can be 0.10 wt% to 0.60 wt%; preferably 0.30 wt% to 0.40 wt%. In one embodiment of the present invention, calculated based on the total weight of the moisturizing skin care coating, the addition ratio of the dimethicone can be 0.10 wt% to 0.40 wt%; preferably 0.20 wt% to 0.30 wt%. In one embodiment of the present invention, calculated based on the total weight of the moisturizing skin care coating, the addition amount of the glycerol is 0.1 wt%, the addition amount of the sorbitol is 0.3 wt%, and the addition amount of the dimethicone is 0.2 wt%.

[0024] According to an embodiment of the present invention, the carrier solution is an aqueous citric acid solution with a concentration of 0.020 wt% to 0.120 wt%.

[0025] Specifically, the carrier solution is prepared from citric acid and deionized water. Preferably, the carrier solution can be an aqueous citric acid solution with a concentration of 0.020 wt%, 0.234 wt%, 0.024 wt%, 0.08182 wt%, 0.0848 wt% or 0.085 wt%. The concentration of the carrier solution can be within the range formed by any two of the above values, but is not limited thereto.

[0026] According to an embodiment of the present invention, the auxiliary agent is selected from one or a combination of two or more of cetylpyridinium chloride, silicone dispersion, preservative, triethanolamine (TEA for short) and cellulose.

[0027] According to an embodiment of the present invention, the cellulose is a cellulose thickener, also known as a gelling agent, for increasing the viscosity of latex and liquid. The cellulose can be selected from one or a combination of two or more of methyl cellulose, carboxymethyl cellulose, carboxyethyl cellulose, and carboxypropyl methyl cellulose. In the embodiment of the present invention, calculated based on the total weight of the moisturizing skin care coating, the addition amount of the cellulose can be 0.05 wt% to 0.50 wt%; preferably 0.10 wt% to 0.20 wt%. Specifically, the addition amount of the cellulose is 0.05 wt%, 0.10 wt%, 0.15 wt%, 0.20 wt%, 0.25 wt%, 0.30 wt%, 0.40 wt% or 0.50 wt%.

[0028] According to an embodiment of the present invention, the triethanolamine (TEA) is a basic pH regulator, which can be selectively added to the moisturizing skin care coating to adjust the final pH value of the moisturizing skin care coating and maintain the stability and efficacy of the coating formulation. In the embodiment of the present invention, calculated based on the total weight of the moisturizing skin care coating, the addition amount of the triethanolamine can be 0 wt% to 0.60 wt%; preferably 0.35 wt% to 0.45 wt%. Specifically, the addition amount of the triethanolamine is 0.05 wt%, 0.10 wt%, 0.15 wt%, 0.30 wt% or 0.40 wt%.

[0029] According to an embodiment of the present invention, the silicone emulsion is a polysiloxane emulsion or an anti-sticking agent, which can be selectively added to the moisturizing skin care coating to reduce the surface stickiness (or surface friction) of the rubber, so as to facilitate wearing gloves. In the embodiment of the present invention, calculated based on the total weight of the moisturizing skin care coating, the addition amount of the silicone emulsion can be 0.10 wt% to 0.40 wt%; preferably 0.20 wt% to 0.30 wt%. Specifically, the addition amount of the silicone emulsion is 0.10 wt%, 0.15 wt%, 0.2 wt%, 0.30 wt% or 0.40 wt%.

[0030] According to an embodiment of the present invention, the cetylpyridinium chloride is a cationic quaternary ammonium compound, which is widely used in mouthwash, toothpaste, lozenges, throat sprays, respiratory sprays and nasal sprays. The cetylpyridinium chloride is also a preservative that can kill bacteria and other microorganisms. The cetylpyridinium chloride can be selectively added to the moisturizing skin care coating to enhance the wet wearing function of surgical gloves. In the embodiment of the present invention, calculated based on the total weight of the moisturizing skin care coating, the addition amount of the cetylpyridinium chloride can be 0.20 wt% to 0.60 wt%; preferably 0.30 wt% to 0.40 wt%. Specifically, the addition amount of the cetylpyridinium chloride is 0.20 wt%, 0.30 wt%, 0.4 wt%, 0.50 wt% or 0.60 wt%.

[0031] According to an embodiment of the present invention, the preservative can be selectively added to the moisturizing skin care coating to prevent the growth of microorganisms and reduce the deterioration, spoilage and contamination of the product. In the embodiment of the present invention, the preservative can be selected from one or a combination of two or more of sodium benzoate, sodium hydroxymethylglycinate, s-triazine compounds or 1,2-benzisothiazolin-3-one. In the embodiment of the present invention, calculated based on the total weight of the moisturizing skin care coating, the addition amount of the preservative can be 0.01 wt% to 0.10 wt%; preferably 0.04 wt% to 0.06 wt%. Specifically, the addition amount of the preservative is 0.01 wt%, 0.02 wt%, 0.03 wt%, 0.04 wt%, 0.05 wt%, 0.06 wt%, 0.07 wt%, 0.08 wt%, 0.09 wt% or 0.10 wt%.

[0032] According to an embodiment of the present invention, since the optimal pH value of most human skin is about between 4.70 and 5.75; when the pH value of the skin care product applied to the skin surface is too high or too low, it may cause skin irritation, peeling, inflammation and other conditions. Therefore, in one embodiment of the present invention, the final pH value of the moisturizing skin care coating can be adjusted to about pH 4.50 to pH 6.00. Preferably, the final pH value of the moisturizing skin care coating can be adjusted to about pH 4.77 to pH 5.70. More preferably, the final pH value of the moisturizing skin care coating can be adjusted to about pH 4.77, pH 4.8, pH 4.85, pH 4.9, pH 4.95, pH 5.0, pH 5.05, pH 5.1, pH 5.15, pH 5.2, pH 5.25, pH 5.3, pH 5.35, pH 5.4, pH 5.45, pH 5.5, pH 5.55, pH 5.6, pH 5.65, or pH 5.7; the final pH value of the moisturizing skin care coating can be within the range formed by any two of the above values, but not limited thereto.

[0033] According to an embodiment of the present invention, since the total solid content of the moisturizing skin care coating of the present invention will affect its skin care effect when applied to the human skin surface after being coated on the inner surface of the glove. For example, a coating with too high a solid content may cause too much or too thick a coating formed on the inner surface of the glove, resulting in problems such as coating peeling, inner surface adhesion and skin irritation; or, conversely, a coating with too low a solid content will make the skin care effect not significant or unable to achieve the expected effect. Therefore, in one embodiment of the present invention, the solid component content (Total Solid Content, TSC, unit: wt%) of the moisturizing skin care coating can be 1.00 wt% to 1.50 wt%. Preferably, the solid component content of the moisturizing skin care coating can be 1.20 wt% to 1.34 wt%. More preferably, the solid component content of the moisturizing skin care coating can be 1.20 wt%, 1.21 wt%, 1.22 wt%, 1.23 wt%, 1.24 wt%, 1.25 wt%, 1.26 wt%, 1.27 wt%, 1.28 wt%, 1.29 wt%, 1.30 wt%, 1.31 wt%, 1.32 wt%, 1.33 wt% or 1.34 wt%; the solid component content of the moisturizing skin care coating can be within the range formed by any two of the above values, but not limited thereto.

[0034] A second object of the present invention is to provide a disposable moisturizing elastic glove. By coating the aforementioned moisturizing skin care coating on the inner surface thereof in contact with the skin to form a dry coating, a good and unobstructed wearing experience of the disposable elastic glove can be provided when not in use or when the hand is dry. When sweat or water vapor escapes to the gap between the hand and the glove on the hand surface, the dry coating is wetted by absorbing the sweat or water vapor to form a wet compress coating with a moisturizing effect, thereby forming a moisturizing care effect on the hand skin.

[0035] To achieve the above object, the technical solution adopted by the present invention is to provide a disposable moisturizing elastic glove, which includes:

[0036] A glove body having an inner surface in contact with the skin;

[0037] A coating is applied to the inner surface of the glove body; the coating is a dry coating formed by coating the aforementioned moisturizing skin care coating on the inner surface of the glove body and drying it.

[0038] According to an embodiment of the present invention, the glove body of the disposable moisturizing elastic glove can be made of a rubber material. Preferably, the glove body can be made of a synthetic rubber latex material and / or a natural rubber latex material. More preferably, when the glove body is a synthetic rubber latex material, it can be selected from one of nitrile (NBR) latex, polyisoprene (IR) latex, and chloroprene (CR) latex or a polymer blend thereof.

[0039] According to an embodiment of the present invention, the coating of the disposable moisturizing elastic glove can be achieved by an on-line method or an off-line method. Among them, the on-line method includes an on-line dipping method and an on-line spraying method or both, and the off-line method includes an off-line spraying method (or an offline spraying method) and an off-line tumbling method.

[0040] In one embodiment of the present invention, the manufacturing process steps for preparing the disposable moisturizing elastic glove using the on-line dipping method generally include: exposing the inner surface (i.e., the wearing surface) of the preformed glove body to the outside, and first immersing it in an immersion tank provided on the immersion production line and containing the moisturizing skin care coating. The glove body after immersion coating and the surface coated with the coating are then subjected to heat drying and forming treatment together, followed by cooling treatment and demolding treatment and removed from the immersion production line, that is, a disposable moisturizing elastic glove with a moisturizing skin care coating applied to the inner surface is prepared. In the embodiment of using the on-line dipping method to prepare the disposable moisturizing elastic glove, no further off-line process is required.

[0041] In one embodiment of the present invention, the offline spraying method is an implementation manner in which a spraying device is used to apply the moisturizing skin care coating onto the inner surface (i.e., the wearing surface) of the glove body. Specifically, the manufacturing steps of preparing the disposable moisturizing elastic glove using the offline spraying method generally include: exposing the inner surface (i.e., the wearing surface) of the preformed glove body to the outside, and placing it into a drum equipped with a spraying device. The moisturizing skin care coating is sprayed to form a fine mist through intermittent spraying and drying process steps for spraying, so as to be coated on the inner surface of the glove body (at this time, it is turned outward to form the outer surface). By heating during the spraying and tumbling process, the moisturizing skin care coating is dried and formed on the inner surface of the glove body. After continuous cooling treatment, it is taken out from the drum equipped with the spraying device, that is, the disposable moisturizing elastic glove with the inner surface coated with the moisturizing skin care coating is prepared.

[0042] In one embodiment of the present invention, the manufacturing steps of preparing the disposable moisturizing elastic glove using the offline tumbling method generally include: after exposing the inner surface (i.e., the wearing surface) of the preformed glove body to the outside and placing it into a drum, then filling the flowable moisturizing skin care coating into the drum, and using the tumbling drum to apply the flowable moisturizing skin care coating onto the inner surface of the glove body. Then, by heating (such as inputting hot air into the drum), the moisturizing skin care coating is dried and formed on the inner surface of the glove body. After continuous cooling treatment, it is taken out from the drum, that is, the disposable moisturizing elastic glove with the inner surface coated with the moisturizing skin care coating is prepared.

[0043] These and other objects, features, and advantages of the present invention are fully reflected by the following detailed description and claims, and can be achieved by the means, devices, and their combinations specifically pointed out in the appended claims. Detailed Embodiments

[0044] The detailed specific implementation schemes of the present invention will be disclosed here. However, it should be understood that the disclosed implementation schemes are only typical examples of the present invention, and the present invention can be implemented in multiple alternative forms. Therefore, the embodiments listed here are not restrictive, and are only based on the principle of the claims, as a representative principle for explaining different implementation manners to those skilled in the art.

[0045] For the convenience of understanding the present invention, the following lists the implementation manners of the moisturizing skin care coating of the present invention in the embodiments, and at the same time provides several comparative examples for comparison. Those skilled in the art can easily understand the advantages and effects that the present invention can achieve through the content of the following and the comparative examples.

[0046] "Moisturizing Skin Care Coating": Examples 1 to 4 (E1 to E4)

[0047] The moisturizing skin care coatings of Examples 1 to 4 are prepared by the method described below and the ratios of the sample codes E1 to E4 shown in Table 1.

[0048] First, calculate the composition of Examples 1 to 4 according to Table 1 based on the total weight of the skin care and moisturizing materials; add chitosan with an N-ethyl removal rate of more than 55% and a density of more than 0.3 g / ml to a citric acid aqueous solution prepared from citric acid and deionized water, and stir until the chitosan is mixed and dissolved to obtain a chitosan solution.

[0049] Next, add moisturizing agents such as glycerol, sorbitol, and dimethicone to a carrier solution prepared from citric acid and deionized water to form a moisturizing solution; then add the moisturizing solution to the chitosan solution and stir to obtain a mixed solution.

[0050] Finally, add additives such as cetylpyridinium chloride, silicone emulsion, preservative, triethanolamine, and cellulose to the mixed solution one by one, and rinse the small beaker or container used for weighing the ingredients with a small amount of deionized water (about 10 wt%) to ensure that all components are completely transferred to the mixed solution for stirring and mixing. Stir until the additives are mixed and dissolved in the mixed solution to obtain a moisturizing skin care coating.

[0051] Table 1: Composition and ratio (wt%) of the moisturizing skin care coating of Examples 1 to 4 (E to E4)

[0052]

[0053] "Moisturizing Skin Care Coating": Comparative Examples 1 to 3 (C1 to C3)

[0054] The moisturizing skin care coatings of Comparative Examples 1 to 3 were prepared by the method described below and the ratios of the sample codes C1 to C3 shown in Table 2.

[0055] Comparative Examples 1 and 2 (C1 and C2)

[0056] First, calculate the composition of Comparative Examples 1 and 2 according to Table 2 based on the total weight of the skin care and moisturizing materials.

[0057] Next, add the total amount of deionized water to a beaker and add the other ingredients listed in Table 2 one by one under continuous stirring to form a composition; stir the composition at room temperature for at least about 60 minutes until a stable and uniform solution is formed to obtain a moisturizing skin care coating.

[0058] Comparative Example 3

[0059] First, calculate the composition of Comparative Example 3 according to Table 2 based on the total weight of the skin care and moisturizing materials.

[0060] Next, most of the deionized water (about 88.25 wt%) was added to a beaker, and the mixture was continuously stirred while adding the other components listed in Table 2 one by one to form a composition. A small amount of deionized water (about 10 wt%) was reserved to rinse the small beaker or container used for weighing the ingredients to ensure that all components were completely transferred to the beaker for stirring and mixing. The composition was stirred at room temperature for at least 60 minutes until a stable and homogeneous solution was formed.

[0061] Table 2: Composition and ratio (wt%) of the moisturizing skin care coatings of Comparative Examples 1 to 3 (C1 to C3)

[0062]

[0063] Test Example 1: Solid content, pH value, and viscosity of the moisturizing skin care coating

[0064] In this test example, the moisturizing skin care coatings of the foregoing Examples 1 to 4 (E1 to E4) and Comparative Examples 1 to 3 (C1 to C3) were used as the test samples. According to Sections 8, 11, and 15 described in the document "ASTM D1076-02: Standard Specification for Rubber-Concentrated, Ammonia Preserved, Creamed and Centrifuged Natural Latex", the solid content, pH value, and viscosity of each test sample (E1 to E4 and C1 to C3) were measured.

[0065] The specific method for testing the solid content in this test example is as follows:

[0066] 1) Weigh 2.5 ± 0.5 grams of the moisturizing skin care coating sample in a flat-bottomed lid or dish made of glass, tinned metal aluminum, accurate to milligrams;

[0067] 2) Spread each moisturizing skin care coating sample evenly over an area of approximately 32 square centimeters (or 5 square inches);

[0068] 3) Dry the foregoing moisturizing skin care coating sample in a ventilated oven at 100 ± 5 °C for about 60 minutes;

[0069] 4) Cover the dish, cool it in a desiccator at room temperature, and weigh it;

[0070] 5) Repeat steps 1) to 4) twice, and then dry it to a constant weight with a tolerance of 1 mg, and calculate the average weight of the two times according to the following formula: % Total solid content = (Dry weight of the moisturizing coating material X 100) / (Wet weight of the moisturizing coating sample).

[0071] The measurement results are shown in Table 3 below. As can be seen from Table 3, the solid contents of Examples 1 to 4 (E1 to E4) are maintained between approximately 1.20% and 1.31%, while the viscosities are maintained between approximately 5 cps and 13 cps; in contrast, the solid content and viscosity of Comparative Example 1 (C1) are 1 to 4 times higher than those of Examples 1 to 4. Therefore, the viscosity of Comparative Example 1 is also much higher than that of Examples 1 to 4.

[0072] The results in Table 3 show that the solid content and viscosity ranges of the moisturizing skin care coatings of Examples 1 to 4 can effectively control the uniformity and overall thickness of the skin care coating applied on the gloves, ensure that an appropriate amount of skin care material is evenly coated on the glove surface, and prevent related problems such as stickiness and peeling on the surface due to excessive skin care material coated on the surface. Furthermore, it can be reasonably inferred that the coating thickness of the moisturizing skin care coating of Comparative Example 1 is necessarily difficult to form a uniform and thin coating due to its high viscosity characteristics, resulting in problems such as easy peeling of the coating formed by Comparative Example 1 and difficult wearing of the gloves, which seriously affect the wearing experience of the gloves.

[0073] In addition, the solid contents and viscosities of Comparative Examples 2 and 3 (C2 and C3) are lower than those of Examples 1 to 4. This may cause Comparative Examples 2 and 3 to be unable to be evenly coated on the glove surface due to insufficient leveling, insufficient adhesion, insufficient film thickness, etc., and indirectly affect the loading amount of the moisturizing skin care coating on the glove surface, resulting in an insignificant moisturizing skin care function.

[0074] Table 3: Results of the solid content, pH value, viscosity, etc. measured in Test Example 1 for the moisturizing skin care coatings of Examples 1 to 4 (E1 to E4) and Comparative Examples 1 to 3 (C1 to C3).

[0075]

[0076] "Disposable Moisturizing Elastic Gloves": Examples 1A to 4A (E1A to E4A), Comparative Examples 1A to 3A (C1A to C3A)

[0077] The disposable moisturizing elastic gloves of Examples 1A to 4A and Comparative Examples 1A to 3A were prepared by the offline spraying method described below.

[0078] The manufacturing steps for preparing the disposable moisturizing elastic gloves using the offline spraying method generally include: exposing the inner surface of the preformed glove body (i.e., the inner surface in contact with the skin, also the wearing surface) outward, and placing it into a drum equipped with a spraying device. Through intermittent spraying and drying process steps, the moisturizing skin care coatings of Examples 1 to 4 (E1 to E4) and Comparative Examples 1 to 3 (C1 to C3) are formed into fine mists for spraying, so as to be coated on the inner surface of the glove body (at this time, it is turned outward to form the outer surface). By heating during the spraying and tumbling process, the moisturizing skin care coating is dried and formed on the inner surface of the glove body. After subsequent cooling treatment, it is taken out from the drum equipped with the spraying device, and thus the disposable moisturizing elastic gloves of Examples 1A to 4A (E1A to E4A) and Comparative Examples 1A to 3A (C1A to C3A) are prepared. The inner surface of the disposable moisturizing elastic gloves is coated with a dry coating formed by the moisturizing skin care coatings of Examples 1 to 4 (E1 to E4) and Comparative Examples 1 to 3 (C1 to C3).

[0079] Test Example 2: Composition and content of active ingredients in the dry coating of the disposable moisturizing elastic gloves

[0080] In this test example, the disposable moisturizing elastic gloves of the aforementioned Examples 1A to 4A (E1A to E4A) and Comparative Examples 1A to 3A (C1A to C3A) were used as the test samples. According to the testing method of Test Example 1, the solid content of the dry coating of each test sample (E1A to E4A and C1A to C3A) was measured; the measurement results are shown in Table 4A below. Table 4B below shows the total content of the composition components and their weighted contents (wt%) of the moisturizing skin care coatings of the aforementioned Examples 1 to 4 (E to E4).

[0081] Table 4A: Solid content of the dry coatings of Examples 1A to 4A (E1A to E4A) and Comparative Examples 1A to 3A (C1A to C3A).

[0082]

[0083] Table 4B: Total content of the composition components and their weighted contents (wt%) of the moisturizing skin care coatings of Examples 1 to 4 (E to E4).

[0084] Sample Code E1A E2A E3A E4A C1A C2A C3A Chitosan 0.10％ 0.10％ 0.10％ 0.50％ 0.10％ 0.10％ N / A Citric Acid 0.12％ 0.15％ 0.12％ 0.57％ 0.10％ 0.12％ 0.10％ Glycerol 0.10％ 0.10％ 0.20％ 0.10％ 0.25％ 0.10％ 0.10％ Sorbitol 0.30％ 0.30％ 0.40％ 0.30％ 0.75％ 0.30％ 0.30％ Dimethicone 0.20％ 0.20％ 0.30％ 0.20％ N / A 0.20％ 0.20％ Panthenol N / A N / A N / A N / A 0.50％ N / A N / A Glucono Delta-Lactone N / A N / A N / A N / A 0.25％ N / A N / A Auxiliary Agent 1.20％ 1.15％ 1.25％ 1.10％ 3.15％ 1.20％ 1.05％

[0085] As shown in Table 4C below, the results of the content of the moisturizing skin care coating components calculated based on the data in Table 4A and Table 4B for each sample to be tested in this test example are calculated with its dry coating as 100 wt%. Taking Example 1A as an example, the solid content of the dry coating formed by the moisturizing skin care coating in Example 1A is about 2.02% (as shown in Table 4A), and the content of chitosan in the moisturizing skin care coating is about 0.10% (as shown in Table 4B). Therefore, the content of chitosan in the dry coating is calculated as (0.10 wt% / 2.02 wt%) * 100% and is about 5%.

[0086] As can be seen from Table 4C, the active ingredient compositions of the dry coatings of Examples 1A to 4A (E1A to E4A) are superior to those of Comparative Examples 1A to 3A (C1A to C3A). The comparison is as follows:

[0087] 1) The content of chitosan in Examples 1A to 4A is higher than that in Comparative Examples 1A to 3A, which will help to extend the moisturizing function of the coatings in Examples 1A to 4A; conversely, Comparative Examples 1A to 3A do not have the function of extending the moisturizing function.

[0088] 2) Chitosan in the moisturizing skin care coating formulations of Examples 1A to 4A will first dissolve in the citric acid aqueous solution, which will help to improve the solubility of chitosan and also effectively improve the overall effect of the moisturizing skin care coating. Chitosan in Comparative Examples 1A to 3A is not pre-dissolved in the acrylic acid or citric acid aqueous solution, so chitosan is not completely dissolved in the skin care coating, and its overall skin care effect will be affected.

[0089] 3) The moisturizing skin care coating formulations of Examples 1A to 4A contain dimethicone, while the coating formulation of Comparative Example 1A does not contain dimethicone. Therefore, the coating formulations of Examples 1A to 4A have obvious brightening or whitening effects.

[0090] 4) The coating formulation of Comparative Example 1A contains panthenol and gluconolactone. The boiling points of these two active ingredients are lower than those of glycerol and sorbitol, which limits the drying temperature of the coating in Comparative Example 1A. In addition, the solid content and viscosity of the coating in Comparative Example 1A are significantly higher than those of the moisturizing skin care coatings in Examples 1A to 4A, indicating that the coating in Comparative Example 1A is only suitable for offline treatment, while the moisturizing skin care coatings in Examples 1A to 4A are more suitable for online and offline production.

[0091] Table 4C: Results of the composition and content of active ingredients in the dry coatings of the disposable moisturizing elastic gloves of Examples 1A to 4A (E1A to E4A) and Comparative Examples 1A to 3A (C1A to C3A) measured in Test Example 2 for the disposable moisturizing elastic gloves.

[0092]

[0093] Test Example 3: Wearability (Ease of Wear) Test of Disposable Moisturizing Elastic Gloves

[0094] In this test example, the disposable moisturizing elastic gloves of the aforementioned Examples 1A to 4A (E1A to E4A) and Comparative Examples 1A to 3A (C1A to C3A) were used as the test samples. In this test example, a 10-person evaluation group was instructed to wear the test sample gloves to detect the wearability of each test sample (E1A to E4A and C1A to C3A), that is, to test the ease of wearing the gloves.

[0095] First, the group members wore the test sample gloves with dry hands and evaluated the dry wearability of each test sample glove on a scale of 1 to 4; among them, "1 point" indicates poor wearability or difficult to wear; "4 points" indicates excellent wearability or easy to wear. Then, the group members wore the test sample gloves with wet hands and evaluated the wet wearability of each test sample glove on a scale of 1 to 4; among them, "1 point" indicates poor wearability or difficult to wear; "4 points" indicates excellent wearability or easy to wear. The measurement results are shown in Table 5 below.

[0096] As can be seen from Table 5, the ease of wearing of the disposable moisturizing elastic gloves of Examples 1A to 4A (E1A to E4A) and Comparative Examples 1A to 3A (C1A to C3A) during dry wear is quite the same, both being 3.5 points; however, during wet wear, the disposable moisturizing elastic gloves of Examples 1A to 4A with the moisturizing skin care coatings of Examples 1 to 4 of the present invention coated on the inner surface still maintained an evaluation of up to 3 points. On the contrary, the evaluations of the disposable moisturizing elastic gloves of Comparative Examples 1A and 2A with the moisturizing skin care coatings of Comparative Examples 1 and 2 coated on the inner surface decreased significantly, and only the wet wear performance of Comparative Example 3A reached 3 points as well as that of Examples 1A to 4A. It is judged that this is because the total addition amount of each component of the moisturizing skin care coating of Comparative Example 3A is the same or similar to the total addition amount of each component of the moisturizing skin care coating of Examples 1 to 4 of the present invention, so good wearability is still maintained during wet wear.

[0097] In addition, it is worth noting that since the solid content and viscosity of the moisturizing skin care coating of Example C1A are higher than those of other coatings, this may be the reason for the higher loading of the moisturizing skin care coating of the gloves in Example C1A; and the high-loading coating will directly affect the viscosity of the glove surface and lead to a decrease in the wet wear function of the gloves, resulting in Example C1A obtaining the lowest wet wear score.

[0098] Table 5: Test results of the wearability of the disposable moisturizing elastic gloves of Examples 1A to 4A (E1A to E4A) and Comparative Examples 1A to 3A (C1A to C3A) in Test Example 3

[0099] Sample Code E1A E2A E3A E4A C1A C2A C3A Dry Wear 3.5 3.5 3.5 3.5 3.5 3.5 3.5 Wet Wear 3.0 3.0 3.0 2.5 2.3 2.5 3.0

[0100] Test Example 4: Moisturizing and Whitening Effect Test of Disposable Moisturizing Elastic Gloves

[0101] In this test example, the disposable moisturizing elastic gloves of the foregoing Examples 1A to 4A (E1A to E4A) and Comparative Examples 1A to 3A (C1A to C3A) were used as the test samples to be measured.

[0102] In this test example, the "Amni Skin Tester (Brand: Amni, imate)" was used to test the moisturizing and whitening effects. This tester uses the human bioelectrical impedance pulse technology. The induction probe can sense the skin condition. By touching and fitting the skin with the probe of the tester for 3 seconds, the analyzer of the detector will perform big data analysis, and thus calculate the moisture content (moisturizing effect) and whiteness (whitening effect) of the skin. The reference value of the moisture content of the hand measured by this skin tester is 25% to 35%, and the reference value of the whiteness of the hand is 76 to 99 for fair skin; that is, it is better that the moisture content and whiteness of the hand measured by this skin tester fall within the foregoing reference value range; the reference values of the skin moisture content and whiteness measured by this skin tester in summer have an error of ±3%; the reference values of the skin moisture content and whiteness measured in winter have an error of ±5%. The measurement results are shown in Table 6 below.

[0103] As can be seen from Table 6, the glove samples of Examples 1A to 4A have significantly better and prolonged moisturizing effects because the inner surfaces of the gloves are coated with the moisturizing skin care coatings of Examples 1 to 4 (first dispersing chitosan in a citric acid solution and then adding other moisturizing components and auxiliaries); this is because in the moisturizing skin care coating prepared by dispersing chitosan in a citric acid solution in advance, the dispersibility of chitosan is better and it is beneficial to the film-forming property of the moisturizing skin care coating on the inner surface of the glove, thus providing a significantly better moisturizing effect than each comparative example after wearing.

[0104] Referring to Table 1, Table 2 and Table 6, it can be seen that compared with the gloves of Examples 1A to 3A, for the glove of Comparative Example 1A, when the addition amount of chitosan in the moisturizing skin care coating of the glove of Comparative Example 1A and the moisturizing skin care coatings of the gloves of Examples 1A to 3A is the same but the preparation methods are different, the moisturizing performance of the glove of Comparative Example 1A not only decreased by 65% at the test time of 60 minutes, and no moisturizing effect could be measured at 70 minutes, and no whitening effect could be measured for the glove of Comparative Example 1A either.

[0105] Referring to Table 1, Table 2 and Table 6, it can be seen that when comparing the gloves of Comparative Example 2A with those of Example 1A, for the moisturizing and skin care coatings of the gloves in Comparative Example 2A and those in Example 1A, with the total addition amount of each component being exactly the same but the manufacturing methods being different, the gloves in Example 1A still reached 100% at the test time of 60 minutes and still had a moisturizing effect as high as 60% at the test time of 90 minutes. On the contrary, the moisturizing performance of the gloves in Comparative Example 2A had dropped to 85% at the test time of 60 minutes and had decreased to only 39% of the moisturizing effect at 90 minutes. In terms of the whitening effect, the measured whiteness of the gloves in Example 1A was 88%, falling within the better reference value range of the hand whiteness of the aforementioned tester. On the contrary, the measured whiteness of the gloves in Comparative Example 2A was only 56%, lower than the lower limit value (76%) of the better reference value range of the hand whiteness of the aforementioned tester. The above shows that based on the manufacturing method of first dispersing chitosan with a citric acid solution and then adding other moisturizing components and auxiliaries, the gloves prepared in Example 1A indeed have better moisturizing and whitening performance than the gloves in Comparative Example 2A.

[0106] Referring to Table 1, Table 2 and Table 6, it can be seen that when comparing the gloves of Comparative Example 3A with those of Example 1A, for the moisturizing and skin care coatings of the gloves in Comparative Example 3A and those in Example 1A, with the total addition amount of each component being similar but the manufacturing methods being different, although the gloves in Comparative Example 3A still reached 100% at the test time of 60 minutes, when reaching 90 minutes, the moisturizing effect had dropped sharply to only 27% remaining, far lower than the 60% moisturizing effect of the gloves in Example 1A at the test time of 90 minutes, indicating that the formula of the moisturizing and skin care coating of the gloves in Comparative Example 3A has poor performance in prolonging the moisturizing effect. In terms of the whitening effect, the measured whiteness of the gloves in Comparative Example 3A was only 65%, which was not only much lower than the whiteness of the gloves in Example 1A (88%), but also lower than the lower limit value (76%) of the better reference value range of the hand whiteness of the aforementioned tester. The above shows that based on the manufacturing method of first dispersing chitosan with a citric acid solution and then adding other moisturizing components and auxiliaries, the gloves prepared in Example 1A indeed have better moisturizing and whitening performance than the gloves in Comparative Example 3A.

[0107] Table 6: Test results of the moisturizing and whitening effects of wearing disposable moisturizing elastic gloves in Examples 1A to 4A (E1A to E4A) and Comparative Examples 1A to 3A (C1A to C3A) in Test Example 4.

[0108]

[0109] The above content is a further detailed description of the present invention in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention pertains, without departing from the concept of the present invention, several simple deductions or substitutions can be made, and all should be regarded as belonging to the protection scope of the present invention.

Claims

1. A moisturizing skin care coating, characterized in that, calculated based on the total weight of the coating, it contains: 2.65wt% to 3.50wt% of chitosan solution; 85.40wt% to 86.20wt% of moisturizing solution; 11.10wt% to 11.25wt% of additives; wherein, the chitosan solution is formed by dissolving chitosan with an N-ethyl deacetylation rate of more than 55% and a density of more than 0.3 g / ml in an acidic aqueous solution, and the acidic aqueous solution is a solution with a pH value less than 6.5 formed by dissolving an organic acid in deionized water; the moisturizing solution contains a carrier solution and at least one moisturizer.

2. The moisturizing skin care coating according to claim 1, characterized in that: the acidic aqueous solution is a citric acid aqueous solution formed by dissolving citric acid in deionized water, the concentration of the citric acid aqueous solution is 1.5wt% to 17.5wt%, and the weight ratio of chitosan to citric acid is 1:4 to 1:

1.

3. The moisturizing skin care coating according to claim 1, characterized in that: the moisturizer is selected from one or a combination of two or more of glycerol, sorbitol and dimethyl silicone oil.

4. The moisturizing skin care coating according to claim 1 or 3, characterized in that: the carrier solution is a citric acid aqueous solution with a concentration of 0.020wt% to 0.120wt%.

5. The moisturizing skin care coating according to claim 1, characterized in that: the additives are selected from one or a combination of two or more of cetylpyridinium chloride, silicone emulsion, preservative, triethanolamine and cellulose.

6. A preparation method of a moisturizing skin care coating, characterized in that, the steps of the preparation method include: taking chitosan with an N-ethyl deacetylation rate of more than 55% and a density of more than 0.3 g / ml and adding it to a citric acid aqueous solution, stirring until the chitosan is mixed and dissolved to obtain a chitosan solution; the concentration of the citric acid aqueous solution is 1.5wt% to 17.5wt%, and the weight ratio of chitosan to citric acid is 1:4 to 1:1; providing a carrier solution and at least one moisturizer, adding a moisturizing solution formed by the carrier solution and the moisturizer to the chitosan solution, and stirring to obtain a mixed solution; providing at least one additive, adding the additives to the mixed solution one by one, and stirring until the additives are mixed and dissolved in the mixed solution to obtain a moisturizing skin care coating; wherein, calculated based on the total weight of the skin care moisturizing material, the skin care moisturizing material contains 2.65wt% to 3.50wt% of chitosan solution, 85.40wt% to 86.20wt% of moisturizing solution and 11.10wt% to 11.25wt% of additives.

7. The preparation method of the moisturizing skin care coating according to claim 6, characterized in that: the moisturizer is selected from one or a combination of two or more of glycerol, sorbitol and dimethyl silicone oil.

8. The preparation method of the moisturizing skin care coating according to claim 6, characterized in that: the carrier solution is a citric acid aqueous solution with a concentration of 0.020wt% to 0.120wt%.

9. The preparation method of the moisturizing skin care coating according to claim 6, characterized in that: the auxiliary agent is selected from one or a combination of two or more of cetylpyridinium chloride, silicone emulsion, preservative, triethanolamine and cellulose.

10. A disposable moisturizing elastic glove, characterized in that, the glove comprises: a glove body having an inner surface in contact with the skin; a coating applied to the inner surface of the glove body; the coating is a dry coating formed by coating the inner surface of the glove body with the moisturizing skin care coating according to any one of claims 1 to 5 and drying.

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