Novel efficient nourishing leather oil and preparation method thereof

Abstract

The invention discloses novel efficient nourishing leather oil and a preparation method thereof. The novel efficient nourishing leather oil is prepared from a natural vegetable oil matrix, hydrolyzed collagen, nano silicon dioxide aerogel, a vegetable wax compound, an antioxidant system and a bioactive penetrant. The preparation method adopts a low-temperature gradient mixing and high-pressure homogenizing process to realize stable dispersion of active components. Tests show that the penetration depth of the product reaches 2.3 times that of a traditional product, the wear resistance is improved by 40%, the biodegradation rate is larger than 90%, and the product is suitable for long-acting maintenance of high-grade leatherware.

Description

Technical Field

[0001] This invention belongs to the field of leather care chemicals technology, and in particular relates to a novel high-efficiency nourishing leather oil and its preparation method. Background Technology

[0002] Leather products are widely used due to their unique texture and durability, but they are prone to problems such as oil loss, dryness, aging and cracking, and dullness during use. Therefore, they need to be maintained regularly with care products. Although there are many types of leather care products on the market, they generally have one or more of the following technical defects: (1) Superficial nourishing effect: Many products (such as some traditional shoe polishes) mainly rely on paraffin, mineral oil or silicone oil to form a physical barrier on the surface of leather. Although they can brighten the shine in a short time, they are difficult to penetrate into the leather fibers and cannot replenish the natural oils and nutrients lost by the leather. Long-term use may lead to a decrease in the breathability of the leather and even accelerate aging and hardening. (2) Single function: Most products focus on single functions such as polishing, waterproofing or cleaning. For example, the maintenance oil provided by patent CN107523225A9 emphasizes long-lasting shine and dust prevention, but its components (such as high proportion of wax and silicone oil) mainly act on the surface and lack deep nourishing and repairing components. It is only a temporary solution for dry and aged leather. (3) Chemical solvents and irritation: Some products use organic solvents or chemical components such as acetone, turpentine, and trichlorofluoroethane. These substances may have an irritating odor, and long-term exposure may have potential effects on the health of users and the leather itself, which also goes against the trend of environmentally friendly development. (4) Insufficient stability and durability: Although some emulsion-type products (such as CN107365882B14) use water-in-oil emulsifiers and add a variety of oils, their antioxidant system may not be perfect. After long-term storage or use, the products are easily oxidized, leading to rancidity and short-lasting nourishing effect. (5) Poor environmental protection and biocompatibility: The large-scale use of petroleum derivatives (such as liquid paraffin 1), synthetic esters or chemically synthesized materials has poor biodegradability, and its components are not compatible with the natural structure of leather, affecting the natural presentation of the care effect. Therefore, developing a leather care oil that can deeply nourish, provide multiple protections, is environmentally friendly and has excellent stability is of great significance for improving the service life and appearance of leather products. Summary of the Invention

[0003] To address the shortcomings of the existing technology, the present invention provides a novel, highly efficient leather nourishing oil with good permeability, wear resistance, and high biodegradability, as well as its preparation method.

[0004] To solve the above problems, the technical solution adopted by the present invention is as follows: A novel, highly effective nourishing leather oil, characterized by comprising the following components and their weight parts: 150-200 parts of natural plant oil matrix, 30-50 parts of hydrolyzed collagen, 3-8 parts of modified nano-silica aerogel, 6-10 parts of plant wax complex, 6-10 parts of composite antioxidant, and 6-10 parts of bio-based penetrant.

[0005] Furthermore, the natural plant oil base is at least one of jojoba oil, avocado oil, olive oil, flaxseed oil, castor oil, marula oil, and apricot kernel oil.

[0006] Furthermore, the hydrolyzed collagen is at least one of hydrolyzed fish collagen, hydrolyzed bovine collagen, hydrolyzed porcine collagen, hydrolyzed plant protein, and hydrolyzed feather collagen.

[0007] Furthermore, the plant wax complex is one or more of the following: carnauba wax-candelilla wax complex, rice bran wax-sunflower wax complex, candelilla wax-jojoba wax complex, carnauba wax-laurel wax complex, soybean wax-canopa wax complex, and compound plant emulsified wax.

[0008] Furthermore, the compound antioxidant is one or more of the following: tocopherol (vitamin E) + ascorbyl palmitate (vitamin C derivative) + citric acid; di-tert-butyl-p-cresol (BHT) + tert-butylhydroxyanisole (BHA) + disodium ethylenediaminetetraacetate (EDTA); rosemary extract + tocopherol (vitamin E) + green tea extract (rich in tea polyphenols); tert-butylhydroquinone (TBHQ) + tocopherol (vitamin E) + lecithin; ascorbic acid (vitamin C) / sodium ascorbate (water-soluble) + tocopherol (oil-soluble); disodium ethylenediaminetetraacetate (EDTA) + propyl ester (PG) + di-tert-butyl-p-cresol (BHT).

[0009] Furthermore, the bio-based penetrant is one or more of alkyl glycosides, isoalkanes, isopropyl myristate, ethyl oleate, lauryl polyoxyethylene ether, and bio-based ethoxylated furanyl dicarboxylate.

[0010] Furthermore, the molecular weight of the hydrolyzed collagen is 800-1500 Da.

[0011] A novel and highly efficient method for preparing leather nourishing oil employs a stepwise mixing, temperature-controlled emulsification, and stepped cooling process; the steps are as follows: S1. Raw material preparation and pretreatment: Accurately weigh each of the above-mentioned components; crush the plant wax complex into small pieces with a particle size of less than 5 mm to facilitate melting; use a high-speed pulverizer (≥10000 rpm) to pre-disperse the modified nano-silica aerogel in one-third of the natural plant oil matrix, treat for 5-10 minutes, and prepare a uniform nano-aerogel slurry for later use; this step is crucial to prevent the agglomeration of nanomaterials; S2. Oil Phase Preparation and Initial Dispersion of Nanomaterials: Preheat the reactor to 50°C; add the remaining natural plant oil matrix, pretreated plant wax complex, and bio-based penetrant; slowly raise the temperature to 75°C-80°C, adjust the stirring speed to 300-400 rpm, and continue stirring for 20-30 minutes until the plant wax is completely melted and the system is clear and transparent; slowly add the preheated 50°C nano-aerogel slurry to the reactor while stirring, increase the stirring speed to 600-800 rpm, maintain the temperature at 75°C, and continue stirring for 30 minutes to ensure that the nanomaterials are initially and uniformly dispersed in the oil phase; S3. Homogenization, Emulsification, and Cooling Addition: Turn on the homogenizer in the reactor (20,000-25,000 rpm) and perform high-speed shear emulsification on the above mixed oil phase for 15 minutes. This process ensures that the nano-silica aerogel and plant wax complex are fully dispersed to form a micro-uniform and stable system. Stop heating and begin slow cooling. Cool the system by circulating cooling water through the jacket. When the temperature drops to 45℃-50℃ (this temperature is below the decomposition temperature of collagen and antioxidants), add hydrolyzed collagen and compound antioxidants sequentially at a medium stirring speed (400 rpm) to ensure that they are fully dissolved and dispersed, and continue cooling. S4. Final Homogenization and Finished Product: When the temperature drops to 35℃-40℃ (slightly above the solidification point of the wax), turn on the homogenizer again (speed 15000-20000 rpm) and homogenize for 10 minutes. The purpose is to perform a final strong dispersion before final solidification, break up any possible tiny flocs, and obtain an extremely fine product texture. Filter the final product through a 200-mesh stainless steel sieve to remove any trace amounts of impurities or undispersed matter. Under aseptic conditions, fill the liquid into light-proof, sealed containers and allow it to cool to room temperature to obtain the finished product.

[0012] The beneficial effects of this invention are as follows: 1. Deep Penetration and Targeted Nourishment: By combining bio-based penetrants with small-molecule natural plant oils, the product's surface tension is significantly reduced, allowing nourishing ingredients to quickly penetrate the leather surface and reach the interior of the fibers. The specially added hydrolyzed collagen is homologous to the main components of leather, enabling efficient absorption by the leather fibers, precisely replenishing lost protein, effectively reversing dryness and hardening of the leather, and restoring its supple and resilient feel.

[0013] 2. Multi-dimensional Synergistic Protection Mechanism: Anti-aging: The compound antioxidants, through a synergistic effect, comprehensively eliminate free radicals, effectively delaying the oxidative rancidity process of the product itself and leather oils. UV Protection: Modified nano-silica aerogel (hydrophobic) has excellent UV scattering and absorption capabilities, forming a "transparent barrier" on the leather surface, significantly reducing fading and aging caused by sunlight UV rays. Abrasion and Water Resistance: The plant wax complex and nano-aerogel work synergistically to form a breathable, smooth, and durable protective film on the leather surface, giving the leather excellent gloss, water resistance, and abrasion resistance, and making it less prone to dust accumulation.

[0014] 3. Excellent stability and durability: Product stability: Through nano-slurry pretreatment, step-by-step addition, and high-speed homogenization processes, the modified nano-silica aerogel and other poorly soluble components are ensured to maintain long-term stable dispersion in the system, without sedimentation or stratification. Durability of effects: Through optimized formulation and processing, each functional component bonds firmly to the leather, is resistant to rubbing, and does not easily run off, significantly extending the duration of nourishing and protective effects and reducing the frequency of care.

[0015] 4. Environmentally Friendly and Safe to Use: Core components such as natural plant oils, bio-based penetrants, plant waxes, and hydrolyzed proteins are all derived from renewable resources and are highly biodegradable. The product contains no irritating organic solvents, harmful metal salts, or potentially sensitizing preservatives, making it safe and friendly to users, leather products, and the environment. Detailed Implementation

[0016] The present invention will now be described in further detail.

[0017] A novel and highly efficient method for preparing leather nourishing oil employs a stepwise mixing, temperature-controlled emulsification, and stepped cooling process; the steps are as follows: S1. Raw material preparation and pretreatment: Accurately weigh each of the above-mentioned components; crush the plant wax complex into small pieces with a particle size of less than 5 mm to facilitate melting; use a high-speed pulverizer (≥10000 rpm) to pre-disperse the modified nano-silica aerogel in one-third of the natural plant oil matrix, treat for 8 minutes, and prepare a uniform nano-aerogel slurry for later use; this step is crucial to prevent the agglomeration of nanomaterials.

[0018] S2. Oil Phase Preparation and Initial Dispersion of Nanomaterials: Preheat the reactor to 50°C; add the remaining natural plant oil matrix, pretreated plant wax complex, and bio-based penetrant; slowly raise the temperature to 80°C, adjust the stirring speed to 350 rpm, and continue stirring for 25 minutes until the plant wax is completely melted and the system is clear and transparent; slowly add the preheated 50°C nano-aerogel slurry to the reactor while stirring, increase the stirring speed to 700 rpm, maintain the temperature at 75°C, and continue stirring for 30 minutes to ensure that the nanomaterials are initially and uniformly dispersed in the oil phase.

[0019] S3. Homogenization, Emulsification, and Cooling Addition: Turn on the homogenizer in the reactor (20,000-25,000 rpm) and perform high-speed shear emulsification on the above mixed oil phase for 15 minutes. This process ensures that the nano-silica aerogel and plant wax complex are fully dispersed to form a micro-uniform and stable system. Stop heating and begin slow cooling. Cool the system by circulating cooling water through the jacket. When the temperature drops to 45°C (this temperature is below the decomposition temperature of collagen and antioxidants), add hydrolyzed collagen and compound antioxidants sequentially at a medium stirring speed (400 rpm) to ensure that they are fully dissolved and dispersed, and continue cooling.

[0020] S4. Final Homogenization and Finished Product: When the temperature drops to 38℃ (slightly above the solidification point of the wax), turn on the homogenizer again (speed 15000-20000 rpm) and homogenize for 10 minutes. The purpose is to perform a final strong dispersion before final solidification, break up any possible tiny flocs, and obtain an extremely fine product texture. Filter the final product through a 200-mesh stainless steel sieve to remove any trace amounts of impurities or undispersed matter. Under aseptic conditions, fill the liquid into light-proof, sealed containers and allow it to cool to room temperature to obtain the finished product.

[0021] The specific allocation ratios for each group are as follows. Example 1

[0022] Weigh out 200 parts by weight of the above-mentioned jojoba oil / avocado oil (mass ratio 1:1), 50 parts by weight of hydrolyzed fish collagen, 10 parts by weight of carnauba wax / candelilla wax (mass ratio 1:3), 10 parts by weight of tocopherol / ascorbyl palmitate / citric acid (mass ratio 1:1:1), 10 parts by weight of alkyl glycoside, and 5 parts by weight of modified nano-silica aerogel. Prepare leather care oil 1 according to the above preparation process. Example 2

[0023] Weigh out 200 parts by weight of the above-mentioned jojoba oil / avocado oil (mass ratio 1:1), 40 parts by weight of hydrolyzed fish collagen, 8 parts by weight of carnauba wax / candelilla wax (mass ratio 1:3), 8 parts by weight of tocopherol / ascorbyl palmitate / citric acid (mass ratio 1:1:1), 8 parts by weight of alkyl glycoside, and 5 parts by weight of modified nano-silica aerogel. Prepare leather care oil 2 according to the above preparation process. Example 3

[0024] Weigh out 200 parts by weight of the above-mentioned jojoba oil / avocado oil (mass ratio 1:1), 30 parts by weight of hydrolyzed fish collagen, 6 parts by weight of carnauba wax / candelilla wax (mass ratio 1:3), 6 parts by weight of tocopherol / ascorbyl palmitate / citric acid (mass ratio 1:1:1), 6 parts by weight of alkyl glycoside, and 5 parts by weight of modified nano-silica aerogel. Prepare leather care oil 3 according to the above preparation process. Example 4

[0025] Weigh out 150 parts by weight of the above-mentioned jojoba oil / avocado oil (mass ratio 1:1), 50 parts by weight of hydrolyzed fish collagen, 10 parts by weight of carnauba wax / candelilla wax (mass ratio 1:3), 10 parts by weight of tocopherol / ascorbyl palmitate / citric acid (mass ratio 1:1:1), 10 parts by weight of alkyl glycoside, and 5 parts by weight of modified nano-silica aerogel. Prepare leather care oil 4 according to the above preparation process. Example 5

[0026] Weigh out 200 parts by weight of the above-mentioned jojoba oil / avocado oil (mass ratio 1:1), 40 parts by weight of hydrolyzed fish collagen, 8 parts by weight of carnauba wax / candelilla wax (mass ratio 1:3), 8 parts by weight of tocopherol / ascorbyl palmitate / citric acid (mass ratio 1:1:1), 8 parts by weight of alkyl glycoside, and 5 parts by weight of modified nano-silica aerogel. Prepare leather care oil 5 according to the above preparation process. Example 6

[0027] Weigh out 150 parts by weight of the above-mentioned jojoba oil / avocado oil (mass ratio 1:1), 30 parts by weight of hydrolyzed fish collagen, 6 parts by weight of carnauba wax / candelilla wax (mass ratio 1:3), 6 parts by weight of tocopherol / ascorbyl palmitate / citric acid (mass ratio 1:1:1), 6 parts by weight of alkyl glycoside, and 5 parts by weight of modified nano-silica aerogel. Prepare leather care oil 6 according to the above-mentioned preparation process.

[0028] Performance testing and comparative trials Test 1: Particle size detection of leather care oil Leather conditioning oils from Examples 1-6 were used to test the particle size. The analysis was conducted according to ISO 22412: "Particle size analysis - Dynamic light scattering (DLS)," a standard primarily applicable to the analysis of particle size in oils using dynamic light scattering technology. The results showed that the particle size of Examples 1-6 was all less than 5 μm.

[0029] Test 2: Refractive Index Test of Leather Care Oil The leather care oils from Examples 1-6 were used to test their refractive index. Following the standard ASTM D1218, "Standard Test Method for Refractive Index and Refractive Dispersion of Hydrocarbon Liquids," the results showed that the refractive index of the release agent was 1.505 (±0.05). The refractive index values ​​for the examples are detailed in Table 1.

[0030] Test 3: Leather Care Oil Penetration Test Leather care oils from Examples 1-6 were used to test their permeability. The method for determining the permeability of leather care oils was specified in standard EN 16523-1:2015, "Determination of resistance to liquid chemicals." The test results are shown in Table 1.

[0031] Test 4: Leather Care Oil Aging Resistance Test The aging resistance of Examples 1-6 were tested respectively. Following the standard ASTM G154 "Procedure for Fluorescent UV Lamp Exposure Aging Test of Nonmetallic Materials", the samples were placed in a fluorescent UV lamp aging chamber for illumination, using a UVA-340 lamp to simulate the sunlight UV band and alternating cycles of condensation / spraying. Color change (color difference ΔE) was evaluated after the test, and the test results are shown in Table 1.

[0032] Test 5: Water Resistance Test of Leather Care Oil Water resistance was tested using leather care oils from Examples 1-6, following the standard ASTM D7334, "Standard Practice for Determining the Wetting Properties of Coated Surfaces by Contact Angle Measurement." The test results are shown in Table 1.

[0033] Test 6: Storage Stability Test of Leather Care Oil The leather care oils of Examples 1-6 were tested for their storage stability. The leather care oil samples of Examples 1-6 were placed in graduated cylinders (or centrifuge tubes) and left to stand at (30±2)℃. The leather care oils of Examples 1-6 were all stable for 12 months.

[0034] Table 1

[0035] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A novel and highly effective nourishing leather oil, characterized in that, The composition comprises the following components and their weight parts: natural plant oil base 150-200 parts, hydrolyzed collagen 30-50 parts, modified nano-silica aerogel 3-8 parts, plant wax compound 6-10 parts, composite antioxidant 6-10 parts, and bio-based penetrant 6-10 parts.

2. The novel and efficient nourishing leather oil as claimed in claim 1, wherein, The natural plant oil base is at least one of jojoba oil, avocado oil, avocado oil, olive oil, flaxseed oil, castor oil, marula oil, and apricot kernel oil.

3. The novel and efficient nourishing leather oil as claimed in claim 1, wherein, The hydrolyzed collagen is at least one of hydrolyzed fish collagen, hydrolyzed bovine collagen, hydrolyzed pig collagen, plant hydrolyzed protein, and hydrolyzed feather collagen.

4. The novel and efficient nourishing leather oil as claimed in claim 1, wherein, The plant wax compound is one or more of camauba wax-candelilla wax compound, rice bran wax-sunflower wax compound, candelilla wax-jojoba wax compound, camauba wax-laurel wax compound, soybean wax-carnauba wax compound, and composite plant emulsified wax.

5. The novel and efficient nourishing leather oil as claimed in claim 1, wherein, The composite antioxidant is one or more of tocopherol (vitamin E) + ascorbyl palmitate (vitamin C derivative) + citric acid, di-tert-butyl-p-cresol (BHT) + tertiary butyl hydroxy anisole (BHA) + disodium ethylenediaminetetraacetate (EDTA disodium), rosemary extract + tocopherol (vitamin E) + green tea extract (rich in tea polyphenols), tertiary butyl hydroquinone (TBHQ) + tocopherol (vitamin E) + lecithin, ascorbic acid (vitamin C) / sodium ascorbate (water-soluble) + tocopherol (oil-soluble), disodium ethylenediaminetetraacetate (EDTA disodium) + propyl gallate (PG) + di-tert-butyl-p-cresol (BHT).

6. The novel and highly nourishing leather oil as claimed in claim 1, wherein, The bio-based penetrant is one or more of alkyl glycoside, isomeric alkanes, isopropyl myristate, ethyl oleate, lauryl polyoxyethylene ether, and bio-based ethoxylated furandicarboxylate.

7. The novel and highly nourishing leather oil as claimed in claim 1, wherein, The molecular weight of the hydrolyzed collagen is 800-1500 Da.

8. A method of preparing the novel and highly nourishing leather oil as claimed in claim 1, characterized in that, The process adopts step-by-step mixing, temperature-controlled emulsification, and stepwise cooling, and the steps are as follows: S1, raw material preparation and pretreatment: accurately weigh each material; break the plant wax compound into small pieces with a particle size of less than 5 mm for easy melting; use a high-speed pulverizer (≥10000 rpm) to pre-disperse the modified nano-silica aerogel in one-third of the natural plant oil base, process for 5-10 minutes, and prepare a uniform nano-aerogel slurry for standby; This step is critical and can prevent the agglomeration of nano materials; S2, oil phase preparation and initial dispersion of nano materials: preheat the reaction kettle to 50℃; add the remaining amount of natural plant oil base, pretreated plant wax compound, and bio-based penetrant; slowly heat to 75-80℃, adjust the stirring speed to 300-400 rpm, and continuously stir for 20-30 minutes until the plant wax is completely melted and the system is clear and transparent; slowly add the preheated nano-aerogel slurry at 50℃ to the reaction kettle under stirring, increase the stirring speed to 600-800 rpm, maintain the temperature at 75℃, and continuously stir for 30 minutes to ensure the initial uniform dispersion of nano materials in the oil phase; S3, Homogeneous emulsification and cooling addition: Turn on the homogenizer of the reaction kettle (rotation speed 20000-25000 rpm), and perform high-speed shearing emulsification on the above-mentioned mixed oil phase for 15 minutes; this process can ensure that the nanometer silica aerogel and plant wax compound are fully dispersed to form a microscopically uniform and stable system; stop heating and start slow cooling; Cool the system by circulating cooling water through the jacket; when the temperature drops to 45-50°C (which is lower than the decomposition temperature of collagen and antioxidants), add hydrolyzed collagen and composite antioxidants in sequence under moderate stirring speed (400 rpm) to ensure their full dissolution and dispersion, and continue cooling; S4, Final homogenization and product formation: when the temperature drops to 35-40°C (slightly higher than the freezing point of wax), turn on the homogenizer again (rotation speed 15000-20000 rpm) and perform homogenization for 10 minutes, the purpose of which is to perform a final strong dispersion before final solidification, break the possible small flocculation bodies, and obtain an extremely delicate product texture; filter the final product through a 200-mesh stainless steel screen to remove any possible small amount of impurities or undispersed substances; under sterile conditions, fill into light-proof and sealed containers while in liquid state, and cool to room temperature after standing, to obtain the finished product.

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