Leatherware maintenance paste easy to polish

Abstract

The invention discloses easy-to-polish leather maintenance cream which comprises the following components: deionized water, a modified palm wax emulsion, an environment-friendly penetrant, a resin emulsion, metal complex dye water, a synthetic grease emulsion and an additive, the preparation method comprises the following steps: weighing deionized water, and adding the penetrant, the synthetic grease emulsion and the modified resin emulsion; adding the modified palm wax emulsion to be uniformly mixed; adding metal complex dye water; adding an additive; packaging; wherein the modified palm wax emulsion is prepared by the following steps: adding concentrated sulfuric acid and palm wax, melting the palm wax, and adding a hydrogen peroxide solution for complete oxidation; heating and re-melting, adding water, continuously stirring, and standing; repeating the washing step; adding zinc oxide, heating and melting; and adding high-molecular polyethylene glycol, slowly cooling to normal temperature after the reaction is finished, and filtering to obtain the modified palm wax emulsion. After the easy-to-polish leather product maintenance paste is used, a layer of compact wax film can be formed on the surface layer of a leather product, so that the maintained leather product has excellent polishing performance.

Description

Technical Field

[0001] The invention relates to a daily chemical product, in particular to a leather care product. Background Art

[0002] Most of the leather renovation creams or maintenance creams widely used in the market now use various wax and grease emulsions to achieve the maintenance and re-polishing of leather goods. Although this type of system is simple to operate, due to the sublimation effect of wax and grease, the maintenance and renovation effect of the maintenance and renovation cream on leather goods will be lost quickly; and due to the natural fiber spacing between leather fibers, the grease can migrate and spread between these fibers over time, causing the maintenance effect to be significantly weakened or even ineffective.

[0003] To address such defects, there are liquid maintenance brighteners based on newly added resin materials, but such materials require a nozzle with an atomizing effect to spray the materials evenly onto the surface of leather goods. Consumers who do not have a certain level of operational knowledge cannot use such devices to spray the materials evenly onto the surface of leather. Improper operation often results in accumulation and sagging of the materials, which not only fails to achieve the maintenance effect, but also contaminates the leather goods due to the accumulation and sagging of the materials. In severe cases, the surface of the leather goods may be damaged, causing the leather goods to be damaged and unusable.

[0004] The other type of care lotion, which is a paste-like care lotion made by adding resin materials to the first type of materials in order to avoid the above two situations (short maintenance effect on leather goods and inconvenient operation), has to use a polishable resin because of the need to match the polishing performance (polishing can make the leather surface more refreshing and natural, and can retain the original texture of the leather to the maximum extent, and give the leather a classic waxy luster, improve the grade of the leather, and achieve the purpose of renovation and maintenance). This type of polishable resin is extremely special among the various types of resins. It needs to be specially modified and needs to be able to match the softness, toughness, water vapor permeability, and bending resistance of the natural fibers of the leather. Therefore, the polishable resin emulsions that can be selected for use in such products are very few and expensive, which is not friendly to both manufacturers and consumers. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a unique easy-to-polish leather care cream, which can form a dense wax film on the surface of the leather after use, so that the leather after care has excellent polishing performance.

[0006] In order to solve this technical problem, the technical solution adopted by the present invention is as follows:

[0007] An easy-to-polish leather maintenance cream, characterized in that the weight parts of the components are as follows: 30-40 parts of deionized water, 30-40 parts of modified palm wax emulsion, 5-10 parts of environmentally friendly penetrant, 6-10 parts of resin emulsion, 2-5 parts of metal complex dye water, 5-10 parts of synthetic oil emulsion, and 3-5 parts of additives;

[0008] The preparation method thereof comprises the following steps:

[0009] S1: Weigh deionized water, slowly add penetrant, synthetic oil emulsion, and modified resin emulsion under stirring, and maintain the speed at 200-300 rpm;

[0010] S2: slowly add the modified palm wax emulsion to the solution of step S1, maintain the rotation speed at 300-400 rpm, and stir for 30-40 minutes until the solution is evenly mixed;

[0011] S3: slowly add metal complex dye water to the solution in step S2, keep the speed at 300-400 rpm, and stir for 30-40 minutes until the mixture is evenly mixed;

[0012] S4: Weigh the additives, and slowly add them to the mixed solution in the stirring state in step S3 in batches and in order, maintaining 400-600 rpm;

[0013] S5: packaging;

[0014] The preparation method of the modified palm wax emulsion in step S2 comprises the following steps:

[0015] S21, adding 75% concentrated sulfuric acid to the enameled reactor and keeping the heating state, then adding palm wax to the enameled reactor, and continuously heating the palm wax to 90-100° C. to melt the palm wax, slowly adding 35% hydrogen peroxide solution under stirring, and continuously stirring at a constant temperature of 90-100° C. for 12-14 hours to completely oxidize the palm wax, and the color of the palm wax changes to brown, and naturally cooling, standing for 1-3 hours to separate the wax and water, and releasing the water in the lower layer;

[0016] S22, heating the enameled reactor to 90-100° C. to melt the oxidized palm wax in the upper layer into liquid again, adding water while stirring, stirring continuously for 30-40 minutes, standing for 1-3 hours to separate the wax and water, and releasing the water in the lower layer;

[0017] S23, repeating step S22 3-5 times, forming a high acid value synthetic wax on the upper layer, and recycling the water on the lower layer;

[0018] S24, adding zinc oxide into the high acid value synthetic wax, wherein the mass ratio of the high acid value synthetic wax to zinc oxide is 100:(0.5-2), heating to 150-160°C to melt the synthetic wax; then adding high molecular weight polyethylene glycol, wherein the mass ratio of the high acid value synthetic wax to the high molecular weight polyethylene glycol is 100:(0.2-0.5), and the relative molecular weight of the high molecular weight polyethylene glycol is 100-200, reacting for 5-8 hours, slowly cooling to room temperature after the reaction is completed, and filtering to obtain a modified palm wax emulsion.

[0019] Furthermore, the modified resin emulsion is a polyurethane resin emulsion or an acrylic resin emulsion; the modified resin emulsion is a single-component thermoplastic resin emulsion, and the drying temperature does not exceed 100°C.

[0020] Furthermore, the environmentally friendly penetrant is fatty alcohol polyoxyethylene ether.

[0021] Furthermore, the synthetic oil emulsion is a caprylic / capric triglyceride emulsion.

[0022] Furthermore, the additives include one or more of a leveling agent, a feel agent, a mildew preventer, a flavor, and a thickener.

[0023] The invention obtains a unique leather care cream which is easy to polish after use through a special component formula and a special preparation process.

[0024] According to traditional ideas and processes, in the preparation of modified palm wax emulsion, polyethylene glycol with a relatively large relative molecular weight (existing leather care creams generally use polyethylene glycol with a relative molecular weight of 400-800) and a large amount (the amount used in the existing technology is generally 2%) are used to modify palm wax, thereby obtaining a stable emulsion (its properties are that it does not delaminate, float oil, agglomerate, etc. when stored at 5-25°C for 12 months). In the traditional technical concept, "only stable modified palm wax emulsion is a high-quality and qualified product property." However, the leather care cream prepared in this way is completely and evenly mixed with the resin and the wax emulsion. During the drying process after use, the resin and the modified wax are solidified together, thereby forming a composite film of the resin and the modified wax evenly mixed on the leather surface, and its polishing performance is determined by the resin and the modified wax materials together; if the selected resin does not have polishing performance, then during the forced polishing process, the strong and rapid friction of the polishing tool will cause the smooth and fine composite film of the resin and the modified wax to be "streaked" and "fogged", and it is even more impossible to obtain a smooth, bright, waxy luster. Therefore, in order to obtain high-quality polishing performance after use, the existing leather care cream products can only match and select a limited number of polishable resin emulsions (the molding hardness of this type of resin emulsion is very low), so some high-melting-point hard wax emulsions must be compounded, and the formula is complicated and the cost is high.

[0025] However, the present invention breaks the traditional technical prejudice. By preparing "modified palm wax emulsion with weak emulsification stability", the finished maintenance cream can not only have stable properties during storage, but also enable the resin, oil and other components that have a maintenance effect on leather fibers to penetrate into the leather after the product is applied to the surface of leather goods, while the palm wax can remain in the top layer to form a wax film, thereby creating a new way to make the product have high-quality polishing performance.

[0026] The present invention perfectly improves such problems by breaking through technical prejudices, and excellent polishing performance can be obtained even when using non-polishing type resins.

[0027] The specific effects are described as follows:

[0028] 1. In the modification process of palm wax, high molecular weight polyethylene glycol (PEG) with the minimum relative molecular weight and the minimum dosage are used, so that the modified wax still maintains a high lipophilicity, and does not weaken the excellent polishing property of the wax itself due to excessive hydrophilicity; and the minimum dosage can ensure that the modified side chains of palm wax can be interspersed and evenly mixed with water and resin evenly dispersed in water.

[0029] 2. When the leather care cream is applied to the leather surface, the modified wax has strong lipophilicity and low density, so it is water-repellent, so that the water as a solvent has to penetrate into the leather fiber, thereby driving the resin, oil and other materials that have a care effect on the leather fiber to penetrate into the leather, and the natural long-chain macromolecular palm wax is "forced" to be retained on the top layer of the leather care cream, forming a dense wax film. Because of its own excellent polishing performance, the leather care cream is endowed with special and excellent polishing performance.

[0030] 3. It should be noted that because water is used as the solvent and all materials are hydrophilic, there will be mutual interlacing and cross-linking during the drying process, rather than a single layer of superposition. It is precisely because of this interlacing and cross-linking that the leather care cream has the flex resistance to match the softness of the leather.

[0031] 4. From a microscopic perspective, when water moistens and penetrates into the leather fibers, it will dissolve the smaller molecular oils and resins together. The resin will bond with the leather fibers in the subsequent drying process, bonding and fixing the oils and fats to the surface of the leather fibers, thereby effectively extending the lubricating and maintenance effects of the oils and fats on the leather fibers.

[0032] The leather care cream of the present invention avoids the defects of the prior art (short maintenance cycle of leather goods, inconvenient operation, limited selection and high price, etc.), and forms a wax film that is easy to polish on the surface of leather goods during use, thereby obtaining high-quality polishing performance. Different types of resin emulsions can also be selected for different leathers and leather goods to achieve better deep maintenance, long-term moisturizing, and bright as new effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to make the above-mentioned objects, features and advantages of the present invention more clearly understood, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein:

[0034] Figure 1 The invention discloses a schematic diagram of the process flow of preparing the easy-to-polish leather care cream.

[0035] Figure 2 It is a schematic diagram of the preparation process of modified palm wax emulsion. DETAILED DESCRIPTION

[0036] The present invention is further described in detail below with reference to the accompanying drawings and embodiments:

[0037] The invention discloses an easy-to-polish leather maintenance cream. The weight proportions of the components are as follows: 30-40 parts of deionized water, 30-40 parts of modified palm wax emulsion, 5-10 parts of environmentally friendly penetrant, 6-10 parts of resin emulsion, 2-5 parts of metal complex dye water, 5-10 parts of synthetic oil emulsion and 3-5 parts of additives.

[0038] The weight percentages of the components in each example are shown in Table 1.

[0039] Table 1: Component ratios of Examples 1-5

[0040]

[0041]

[0042] Among them, the leveling agent is modified silicone emulsion, the hand feeling agent is modified silicone emulsion, the mildewproof agent is isothiazolinone, the fragrance is synthetic essence, and the thickener is associative polyurethane resin emulsion. Due to different product requirements, the additives can also use one or more of the leveling agent, hand feeling agent, mildewproof agent, essence, and thickener.

[0043] The modified resin emulsion is a single-component thermoplastic resin emulsion, the drying temperature does not exceed 100° C., and does not include self-crosslinking resins, two-component and multi-component resins, and solvent-based resins.

[0044] The medium-hard polyurethane resin emulsion used in Examples 1 and 2 may be UW 04 produced by FENICE, Italy.

[0045] The medium-soft polyurethane resin emulsion selected in Examples 3 and 5 may be UW 03 from FENICE, Italy.

[0046] The medium-soft acrylic resin emulsion selected in Example 4 may specifically be AR644 produced by FENICE Company of Italy.

[0047] The above-mentioned "medium-hard resin emulsion" refers to a resin having a film hardness between 60A and 75A (Shore hardness), and the "medium-soft resin emulsion" refers to a resin having a film hardness between 30A and 45A (Shore hardness).

[0048] In the above embodiments, the synthetic oil emulsion may also be modified palm oil emulsion or the like.

[0049] In addition to fatty alcohol polyoxyethylene ether, environmentally friendly penetrants such as JFC and JFC-E can also be used.

[0050] Figure 1 The invention discloses a method for preparing the easy-to-polish leather care cream, comprising the following steps:

[0051] S1: Weigh deionized water, slowly add penetrant, synthetic oil emulsion, and modified resin emulsion under stirring, and maintain the speed at 200-300 rpm;

[0052] S2: slowly add the modified palm wax emulsion to the solution of step S1, maintain the rotation speed at 300-400 rpm, and stir for 30-40 minutes until the solution is evenly mixed;

[0053] S3: slowly add metal complex dye water to the solution in step S2, keep the speed at 300-400 rpm, and stir for 30-40 minutes until the mixture is evenly mixed;

[0054] S4: Weigh the additives, and slowly add them to the mixed solution in the stirring state in step S3 in batches and in order, maintaining 400-600 rpm;

[0055] S5: packaging;

[0056] The method for preparing the modified palm wax emulsion in step S2 comprises the following steps (eg Figure 2 shown):

[0057] S21, oxidation, adding concentrated sulfuric acid with a concentration of 75% to the enameled reactor, and keeping the heating state, then adding palm wax to the enameled reactor, and continuously heating the palm wax to 90-100° C. to melt the palm wax, slowly adding a 35% hydrogen peroxide solution under stirring, and continuously stirring at a constant temperature of 90-100° C. for 12-14 hours to completely oxidize the palm wax, and the color of the palm wax changes to brown, and naturally cooling, standing for 1-3 hours to separate the wax and water, and releasing the water in the lower layer;

[0058] S22, washing with water, heating the enamel reactor to 90-100° C. to melt the oxidized palm wax on the upper layer into liquid again, adding water while stirring, stirring continuously for 30-40 minutes, standing for 1-3 hours to separate the wax and water, and releasing the water on the lower layer;

[0059] S23, washing with water for multiple times to remove sulfuric acid, hydrogen peroxide and impurities, repeating step S22 3-5 times, forming a high acid value synthetic wax on the upper layer, and recycling the water on the lower layer;

[0060] S24, modified emulsification, adding zinc oxide to the high acid value synthetic wax, the mass ratio of the high acid value synthetic wax to zinc oxide is 100:(0.5-2), heating to 150-160°C to melt the synthetic wax; then adding high molecular weight polyethylene glycol, the mass ratio of the high acid value synthetic wax to the high molecular weight polyethylene glycol is 100:(0.2-0.5), the relative molecular weight of the high molecular weight polyethylene glycol is 100-200, reacting for 5-8 hours, slowly cooling to room temperature after the reaction is completed, filtering to obtain a modified palm wax emulsion.

[0061] The process parameters of the modified emulsification step in each embodiment are shown in Table 2.

[0062] Table 2: Modified emulsification step parameters

[0063] 1 2 3 4 5 Mass ratio of synthetic wax to zinc oxide 100:(0.5-2) 100:0.5 100:2 100:1.2 100:0.8 100:1.8 Mass ratio of synthetic wax to polyethylene glycol 100:(0.2-0.5) 100:0.5 100:0.4 100:0.2 100:0.3 100:0.5 Relative molecular weight of polyethylene glycol 100-200 200 200 100 100 150

[0064] The modified emulsification in this step is a key step in the preparation method of the present invention. After the unique modified emulsification in step S24, the modified palm wax emulsion presents weak emulsification stability, and its characteristics are: only weak hydrophilicity; for example, the modified palm wax emulsion prepared in Example 1 is tested for stability, and it is shown that it is obviously stratified after being stored at room temperature for 8 hours. After the emulsion is centrifuged at a speed of 3000 rpm for 5 minutes, 3 ml of clear and transparent water is precipitated in a 10 ml test tube.

[0065] The weak emulsification stability of the modified palm wax emulsion is the key to the leather care cream of the present invention gradually forming a wax film that is easy to polish on the leather surface during use. Because the modified wax has strong lipophilicity and low density, it has water repellency, so that water as a solvent has to penetrate downward into the leather fiber, driving resin, grease and other materials that have a maintenance effect on the leather fiber to penetrate into the leather, while the natural long-chain macromolecular palm wax itself is "forced" to remain on the top layer of the leather care cream, forming a dense wax film, thereby giving the leather care cream a special and excellent polishing performance.

[0066] The finished product of the easy-to-polish leather care cream of the present invention is in a paste form, the modified palm wax emulsion presents weak emulsification stability and does not affect the property stability of the finished product, and the finished product can be stored at 5-20° C. for 12 months without abnormality after packaging and can be used normally.

[0067] When the easy-to-polish leather care cream of the present invention is used, leather goods of different textures can be adapted to care creams with different resin emulsion components. For example:

[0068] For men's hard leather bags, the characteristics are that the leather is stiff, and it is required to be wear-resistant, scratch-resistant and collision-resistant. We use the maintenance cream containing the medium-hard polyurethane resin emulsion of Example 1 or 2 for maintenance.

[0069] For soft leather bags for women, the characteristics are soft leather, easy to bend, and friction resistance. We use the maintenance cream containing medium-soft polyurethane resin emulsion or medium-soft acrylic resin emulsion of Example 3, 4 or 5 for maintenance.

[0070] For soft shoes and boots for women, the characteristics are soft leather, comfortable feel and good water vapor permeability. We use the maintenance cream containing medium-soft acrylic resin emulsion in Example 4 for maintenance.

[0071] For sofa leather, its characteristics are soft leather, resistance to friction, resistance to water swelling, and full feel. We use the maintenance cream containing medium-soft polyurethane resin emulsion or medium-hard polyurethane resin emulsion in Example 1, 2, 3 or 5 for maintenance.

[0072] In order to maintain men's hard bags and pursue polishing performance, resin emulsions must use polishable non-ionic polyurethane resin emulsions (whose mold hardness is basically between Shore hardness 10-20A). The selection of resin emulsions is very narrow, and it will also bring very unfavorable maintenance cream characteristics such as too soft texture, which is contrary to the requirements of leather goods for wear resistance, scratch resistance and collision resistance. In order to neutralize the soft texture of such resins, it is necessary to add some high melting point hard wax emulsions (such as polypropylene wax emulsions with a melting point of 140°C) to the maintenance cream to enhance the friction resistance, collision resistance and other properties of the maintenance cream, and give it better polishing performance. The construction and matching of this system requires complex experiments and products to achieve, which also brings complexity to the formula and higher costs, and the product yield rate will also be greatly reduced.

[0073] The leather care cream of the present invention takes a different approach by using a modified palm wax emulsion with weak emulsification stability so that the care cream can form an easy-to-polish wax film on the surface during actual use, thereby solving the defects of existing care creams and allowing the leather to have high-quality polishing performance after maintenance.

[0074] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An easy-to-polish leather care cream, characterized in that The weight proportions of the components are as follows: 30-40 parts of deionized water, 30-40 parts of modified palm wax emulsion, 5-10 parts of environmentally friendly penetrant, 6-10 parts of resin emulsion, 2-5 parts of metal complex dye water, 5-10 parts of synthetic oil emulsion, and 3-5 parts of additives; The preparation method thereof comprises the following steps: S1: Weigh deionized water, slowly add penetrant, synthetic oil emulsion, and modified resin emulsion under stirring, and maintain the speed at 200-300 rpm; S2: slowly add the modified palm wax emulsion to the solution of step S1, maintain the rotation speed at 300-400 rpm, and stir for 30-40 minutes until the solution is evenly mixed; S3: slowly add metal complex dye water to the solution in step S2, keep the speed at 300-400 rpm, and stir for 30-40 minutes until the mixture is evenly mixed; S4: Weigh the additives, and slowly add them to the mixed solution in the stirring state in step S3 in batches and in order, maintaining 400-600 rpm; S5: packaging; The preparation method of the modified palm wax emulsion in step S2 comprises the following steps: S21, adding 75% concentrated sulfuric acid to the enameled reactor and keeping the heating state, then adding palm wax to the enameled reactor, and continuously heating the palm wax to 90-100° C. to melt the palm wax, slowly adding 35% hydrogen peroxide solution under stirring, and continuously stirring at a constant temperature of 90-100° C. for 12-14 hours to completely oxidize the palm wax, and the color of the palm wax changes to brown, and naturally cooling, standing for 1-3 hours to separate the wax and water, and releasing the water in the lower layer; S22, heating the enameled reactor to 90-100° C. to melt the oxidized palm wax in the upper layer into liquid again, adding water while stirring, stirring continuously for 30-40 minutes, standing for 1-3 hours to separate the wax and water, and releasing the water in the lower layer; S23, repeating step S22 3-5 times, forming a high acid value synthetic wax on the upper layer, and recycling the water on the lower layer; S24, adding zinc oxide into the high acid value synthetic wax, the mass ratio of the high acid value synthetic wax to zinc oxide is 100: (0.5-2), heating to 150-160°C to melt the synthetic wax; then adding high molecular weight polyethylene glycol, the mass ratio of the high acid value synthetic wax to the high molecular weight polyethylene glycol is 100:(0.2-0.5), the relative molecular weight of the high molecular weight polyethylene glycol is 100-200, reacting for 5-8 hours, slowly cooling to room temperature after the reaction is completed, and filtering to obtain a modified palm wax emulsion.

2. The leather care cream according to claim 1, characterized in that: The modified resin emulsion is polyurethane resin emulsion or acrylic resin emulsion; the modified resin emulsion is a single-component thermoplastic resin emulsion, and the drying temperature does not exceed 100°C.

3. The leather care cream according to claim 1, characterized in that: The environmentally friendly penetrant is fatty alcohol polyoxyethylene ether.

4. The leather care cream according to claim 1, characterized in that: The synthetic oil emulsion is caprylic / capric triglyceride emulsion.

5. The leather care cream according to claim 1, characterized in that: The additives include one or more of a leveling agent, a feel agent, a mildew preventer, a flavor, and a thickener.

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