A method for manufacturing a long-lasting natural-scented leather or chamois
By using a multi-adsorption system of chromium-free tanning agents and modified nanomaterials in leather manufacturing, the problem of essential oils being difficult to penetrate into leather has been solved, achieving efficient immobilization of essential oils and the manufacture of long-lasting scented leather.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- XUZHOU HONGFENG HIGH MOLECULAR MATERIAL CO LTD
- Filing Date
- 2026-06-08
- Publication Date
- 2026-07-21
AI Technical Summary
In existing technologies, when natural fragrances are introduced into the leather manufacturing industry, essential oil molecules have difficulty penetrating deep into the fibers, resulting in low total load and easy loss.
The animal hides are tanned using chromium-free tanning agents. Combined with a multi-adsorption system of plant tannins and modified nano-artificial zeolite/nano-microcrystalline cellulose, the tannins penetrate and are adsorbed into the leather through oil emulsion. The binding force between natural plant essential oils and leather fibers is utilized to form a highly efficient adsorption and immobilization process.
It achieves the fixation of essential oil molecules deep within the leather, significantly extending the product's durability and efficacy period, increasing the essential oil load, and slowing down volatilization.
Smart Images
Figure CN122428069A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of biomass chemical engineering technology, specifically to a method for manufacturing leather or fur with a durable natural fragrance. Background Technology
[0002] With the booming development of the health and wellness industry, plant essential oils, as natural small-molecule compounds, have been widely used in the field of health and wellness due to their physiological regulatory functions such as relieving anxiety, improving sleep, and antibacterial health benefits. The use of plant essential oils for health and wellness purposes through transdermal absorption or inhalation has a history of thousands of years in my country and has been listed as a national intangible cultural heritage.
[0003] Leather, as a natural biomass material with a three-dimensional spatial network structure, is widely used in clothing, furniture, and footwear—familiar applications—making it an ideal carrier for health and wellness functions and achieving "passive health and wellness." However, current technologies for introducing natural fragrances into leather manufacturing still have significant drawbacks: most existing technologies are limited to simple spraying or coating on the surface of finished leather, with essential oil molecules only remaining in the surface coating and unable to penetrate deep into the fibers. This not only results in extremely low total essential oil load but also makes it easy for the oil to be quickly lost due to friction from daily wear.
[0004] Based on this, the present invention designs a method for manufacturing leather or fur with a durable natural fragrance to solve the above problems. Summary of the Invention
[0005] In view of the above-mentioned shortcomings of the existing technology, the present invention provides a method for manufacturing leather or fur with a durable natural fragrance.
[0006] To achieve the above objectives, the present invention provides the following technical solution: A method for manufacturing leather or fur with a lasting natural fragrance includes the following steps: using legally raised and slaughtered animal hides that have passed inspection and quarantine, and legally raised and slaughtered woolly animal hides that have passed inspection and quarantine; pre-treating the animal hides, the pre-treatment including removing internal and external fat and muscle, as well as loose collagen fibers; then tanning the animal hides using a chromium-free tanning agent that increases the wet heat denaturation temperature of the raw hide and stabilizes its structure; then using plant tannins, modified nano-synthetic zeolite, and nano-microcrystalline cellulose to perform a stepwise filling treatment on the tanned animal hides, forming multiple adsorbents through the filling process. The process involves: first, applying a fatliquoring treatment to the animal hide after the step-by-step filling process using an oil emulsion containing natural plant essential oils, the oil emulsion being composed of natural plant essential oils and emulsifiers, allowing the oil emulsion to penetrate and be adsorbed into the leather or fur; then, using formic acid to adjust the pH of the system to 3.6-4.0 for demulsification, releasing the small essential oil molecules from the emulsion and allowing them to be adsorbed by a multiple adsorption system; subsequently, drying, smoothing, and softening the leather or fur; then, surface finishing on both sides of the leather or the flesh side of the fur; then, spraying and sealing the both sides of the leather or the flesh side of the fur with a resin emulsion to slow down the evaporation of essential oils; finally, sealing and packaging to obtain the finished leather or fur product.
[0007] Furthermore, the animal hide is one of the following: pigskin, cowhide, sheepskin, horsehide, fish skin, crocodile skin, snake skin, rabbit skin, fox skin, or mink skin; Before tanning, the animal hides are subjected to salt immersion treatment using one of the following non-biologically toxic substances: sodium sulfate, sodium hexametaphosphate, or sodium aluminosilicate. The chromium-free tanning agent is one of the following: aldehydes, epoxy tanning agents, oxazolidine, synthetic zeolite, triazine derivatives, vegetable tanning agents, and aluminum triformate. The plant tannins mentioned are one type of hydrolyzable tannins or condensed tannins; The natural plant essential oil is one or more of the following: citrus essential oil, sandalwood essential oil, eucalyptus essential oil, patchouli essential oil, lavender essential oil, rose essential oil, clove essential oil, and peppermint essential oil. In the oil emulsion, the mass percentage of natural plant essential oil is 5%~10%, and the mass percentage of emulsifier is 90%~95%. The emulsifier is a sulfonated vegetable oil, which is a sulfonated product of one or more of monoglycerides, diglycerides, or triglycerides. The surface finishing involves brushing the grain surface of leather or the flesh side of fur with 180-240 grit sandpaper. The resin emulsion is a polyurethane resin emulsion or an acrylic resin emulsion, and the resin emulsion contains 1.0% to 1.2% silicone oil by mass.
[0008] Compared to existing technologies, the advantages of this invention are as follows: 1. This invention utilizes the three-dimensional network structure of natural leather collagen fibers. Based on the natural structural advantage of leather's high porosity, this process fully opens the fiber gaps through pretreatment, providing an ideal physical storage space for plant essential oil molecules and their carriers. Compared to traditional artificial material carriers, this solution increases the upper limit of essential oil loading without damaging the original hygienic properties of the leather.
[0009] 2. This invention introduces a multi-adsorption system of plant tannins and modified nano-synthetic zeolite / nano-microcrystalline cellulose. Utilizing the numerous hydrophobic bonds and van der Waals forces generated between plant polyphenols and weakly polar essential oil molecules after dehydration, combined with the multi-level pore structure of the modified synthetic zeolite (from micropores to mesopores), it can adsorb small organic molecules ranging from polar to weakly polar, and release them through thermal and mechanical forces (see Table 2). This ensures that the essential oils not only simply penetrate the leather or fur, but are deeply anchored within the leather, significantly extending the product's efficacy period.
[0010] 3. This invention uses sulfonated vegetable oils (mono-, di-, and triglyceride sulfonates) as natural surfactants as carriers, and efficiently emulsifies and solubilizes water-insoluble small essential oil molecules through a fatliquoring process. The emulsion penetrates the leather using a leather fatliquoring method. After demulsification via formic acid acidification, the non-polar or weakly polar small-molecule phenolic organic compounds that make up the essential oils are adsorbed by plant tannins and modified nano-synthetic zeolite / nano-microcrystalline cellulose within the leather, ultimately forming a high-capacity immobilized adsorption of the aromatherapy essential oils. Attached Figure Description
[0011] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.
[0012] Figure 1 This is the result of an acute skin irritation / corrosion test for chemicals.
[0013] Figure 2 The results show the porous XRD characterization of the modified nano-synthetic zeolite.
[0014] Figure 3 This is a process flow diagram of the manufacturing method of the durable natural fragrance leather of the present invention. Detailed Implementation
[0015] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.
[0016] Example 1: A method for manufacturing leather with a durable natural fragrance, comprising the following steps: pre-treatment of legally raised and slaughtered cowhides that have passed inspection and quarantine, the pre-treatment including removing internal and external fat and muscle using conventional chemical and physical methods, and loosening the collagen fibers of the hide using conventional chemical or biological methods; tanning with glutaraldehyde tanning agent; then mechanically processing to achieve uniform thickness by squeezing and shaving; adding deionized water to a drum, with a cowhide-to-deionized water mass ratio of 1:1, temperature 35℃, pH 4.5, and sequentially applying hydrolyzed tannins, modified nano-artificial zeolite, and nano-microcrystalline cellulose to the cowhide in a stepwise filling process with 30-minute intervals. The mass ratio of microcrystalline cellulose to cowhide was 7:1:2:120. The temperature was raised to 46℃, and an oil emulsion containing 2% citrus essential oil, 3% sandalwood essential oil, and 95% sulfonated vegetable oil (sulfonated monoglyceride rapeseed oil) was added to a rotating drum. The mass ratio of the oil emulsion to cowhide was 9:100. The cowhide was fatliquored for 60 minutes. Formic acid was used to adjust the pH of the system to 4.0 for demulsification, allowing the small molecules of essential oils to be released from the emulsion and adsorbed by a multiple adsorption system. The leather was then subjected to natural hanging drying, mechanical vibration to soften it, stretching, and tumbling. The grain surface of the leather was brushed with 180-grit sandpaper. Finally, a polyurethane resin emulsion containing 1% silicone oil was sprayed onto the finished leather surface at a rate of 120 g / m² on one or both sides. 2 The packaging is sealed to slow down the evaporation of the essential oils; finally, it is sealed to form a finished sofa leather product. This product has a refreshing and invigorating effect.
[0017] Example 2: A method for manufacturing leather with a durable natural fragrance, comprising the following steps: pre-treatment of legally raised and slaughtered sheep or goat hides that have passed inspection and quarantine, the pre-treatment including removing internal and external fat and muscle using conventional chemical and physical methods, and loosening the hide collagen fibers using conventional chemical or biological methods; tanning with an epoxy tanning agent; followed by squeezing and smoothing mechanical processing to achieve uniform thickness; adding deionized water to a drum, with a sheep hide to deionized water mass ratio of 1:1.1, a temperature of 36°C, and a pH of 4.3; sequentially applying condensed plant tannins, modified nano-artificial zeolite, and nano-microcrystalline cellulose to the sheep hide in a stepwise filling process with intervals of 35 minutes. The mass ratio of zeolite, nanocrystalline cellulose, and sheepskin was 7:2:1:115. The temperature was raised to 52℃, and an oil emulsion containing 5% clove oil, 5% eucalyptus oil, and 90% sulfonated vegetable oil (sulfonated triglyceride rapeseed oil) was added to a rotating drum. The mass ratio of the oil emulsion to sheepskin was 10:100. The sheepskin was fatliquored for 50 minutes. Formic acid was used to adjust the pH of the system to 3.8 for demulsification, allowing the small molecules of essential oils to be released from the emulsion and adsorbed by a multiple adsorption system. The leather was then subjected to natural hanging drying, mechanical vibration to soften it, stretching, and tumbling. The grain surface of the leather was brushed with 240-grit sandpaper. Finally, a polyurethane resin emulsion containing 1% silicone oil was sprayed onto the finished leather surface at a concentration of 130 g / m² on one or both sides. 2 The product is sealed to slow down the evaporation of essential oils; finally, it is sealed in a lightweight athletic shoe leather package. This product has strong antibacterial properties and can improve athlete's foot.
[0018] Example 3: A method for manufacturing leather with a durable natural fragrance, comprising the following steps: pre-treatment of legally raised and slaughtered cattle (yellow cattle or buffalo) hides that have passed inspection and quarantine, the pre-treatment including removing internal and external fat and muscle using conventional chemical and physical methods, and loosening the hide collagen fibers using conventional chemical or biological methods; tanning with aluminum triformate; then mechanically processing to achieve uniform thickness by squeezing and shaving; adding deionized water to a drum, with a cowhide-to-deionized water mass ratio of 1:1.3, a temperature of 42°C, and a pH of 4.6; sequentially applying hydrolyzed plant tannins, modified nano-artificial zeolite, and nano-microcrystalline cellulose to the cowhide in a stepwise filling process with intervals of 25 minutes. The mass ratio of stone, nanocrystalline cellulose, and cowhide was 2:3:2:125. The temperature was raised to 45℃, and an oil emulsion containing 5% lavender essential oil, 1% rose essential oil, and 94% sulfonated vegetable oil (sulfonated diglyceride rapeseed oil) was added to a rotating drum. The mass ratio of the oil emulsion to cowhide was 8.5:100. The cowhide was fatliquored for 55 minutes. Formic acid was used to adjust the pH of the system to 3.7 for demulsification, allowing the small molecules of essential oils to be released from the emulsion and adsorbed by a multiple adsorption system. The leather was then naturally hung to dry, mechanically vibrated to soften it, stretched, and tumbled to soften it further. The grain surface of the leather was brushed with 200-grit sandpaper. Finally, a polyurethane resin emulsion containing 1.2% silicone oil was sprayed onto the finished leather surface at a rate of 140 g / m² on one or both sides. 2 The packaging is sealed to slow down the evaporation of essential oils; finally, it is sealed into a finished cooling mat / pillow mat. This product has the effect of relieving stress and improving sleep.
[0019] Example 4: A method for manufacturing a durable, naturally scented fur, comprising the following steps: pre-treatment of legally raised and slaughtered fox or mink fur that has passed inspection and quarantine, the pre-treatment including removing internal and external fat and muscle using conventional chemical and physical methods, and loosening the collagen fibers of the fur using conventional chemical or biological methods; salting the animal hide with 5% sodium sulfate (mass concentration) to increase the wet heat denaturation temperature and stabilize the raw hide structure for 20 minutes, followed by glutaraldehyde tanning to further increase the wet heat denaturation temperature and stabilize the raw hide structure; then mechanically processing to achieve uniform thickness using squeezing and shaving; adding deionized water to a drum, with a fox or mink fur to deionized water mass ratio of 1:1.5, at a temperature of 40°C and a pH of 4.2, and sequentially applying hydrolyzed plant tannins, modified nano-artificial zeolite, and nano-microcrystalline cellulose to the fox or mink fur. The process involves a 32-minute interval filling process, with the mass ratio of hydrolyzed plant tannins, modified nano-artificial zeolite, nano-microcrystalline cellulose, and fox or mink fur at 6.5:3:0.5:122. The temperature is raised to 50℃, and an oil emulsion containing 3% patchouli essential oil, 5% peppermint essential oil, and 92% sulfonated vegetable oil (sulfonated diglyceride rapeseed oil) is added to the drum at a mass ratio of 8:100 to the fox or mink fur. The fur is then fatliquored for 60 minutes. Formic acid is used to adjust the pH to 3.6 for demulsification, releasing small essential oil molecules from the emulsion for adsorption by a multiple adsorption system. The fur is then naturally hung to dry, mechanically vibrated to soften, stretched, and tumbled. The flesh side of the fur is brushed with 200-grit sandpaper. Finally, an acrylic resin emulsion containing 1.1% silicone oil is sprayed onto the modified fur flesh side at a concentration of 150 g / m². 2 The packaging is sealed to slow down the evaporation of the essential oils; finally, it is sealed in the finished garment / leather packaging. This product has a refreshing and invigorating effect.
[0020] Example 5: Compared with Examples 1-3, the difference is that the animal hides mentioned in Examples 1-3 can also be legal, artificially raised and slaughtered animal hides that have passed inspection and quarantine, such as pigskin, horsehide, fish skin, crocodile skin, snake skin, etc. The chromium-free tanning agent in Examples 1-3 can also be one of oxazolidine, synthetic zeolite, triazine derivatives, or vegetable tanning agents.
[0021] Example 6: Compared with Example 4, the difference is that the animal hides mentioned in Example 4 can also be legal, artificially raised and slaughtered, and inspected and quarantined woolly animal hides, such as rabbit hides. The sodium sulfate used in Example 4 can also be one of sodium hexametaphosphate or sodium aluminosilicate.
[0022] Example 7: The modified nano-artificial zeolite in the above examples is nano-artificial zeolite after dealumination modification. The specific preparation method is as follows: 4A type zeolite is dissolved in 0.5 mol / L hydrochloric acid solution, recrystallized at 80℃ for 4 hours, and then spray dried to obtain porous modified 600~800 nano-artificial zeolite.
[0023] Comparative Example 1: Unlike Example 4, only hydrolyzed plant tannins were used to fill fox or mink fur in stages at 32-minute intervals.
[0024] Experimental Example 1: The finished cooling mat / pillow mat leather product in Example 3 of this invention, after passing GB / T 43722.1-2024 "Determination of Antibacterial Properties of Leather Part 1: Membrane Contact Method" (Table 1) and GB / T 21604-2022 "Acute Skin Irritation / Corrosivity Test of Chemicals", showed no allergic effect. Figure 1 ).
[0025] Table 1 Product Safety Testing .
[0026] Experimental Example 2: The product aroma persistence level test is shown in Table 2.
[0027] Table 2 Product Aroma Duration Level Test .
[0028] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims
1. A method for manufacturing leather or fur with a durable natural fragrance, characterized in that: Includes the following steps: The process utilizes legally raised and slaughtered animal hides that have passed inspection and quarantine, as well as legally raised and slaughtered woolly animal hides that have passed inspection and quarantine. The animal hides undergo pretreatment, including the removal of internal and external fat, muscle, and loose collagen fibers. Then, a chromium-free tanning agent that increases the wet-heat denaturation temperature and stabilizes the hide structure is used to tan the animal hides. Next, plant tannins, modified nano-synthetic zeolite, and nano-microcrystalline cellulose are used to perform a step-by-step filling process on the tanned animal hides, forming a multi-layered adsorption system. Finally, a process containing natural plant essential oils is employed. The process involves using an oil emulsion to fatliquore animal hides after a step-by-step filling process. The oil emulsion, composed of natural plant essential oils and emulsifiers, penetrates and adsorbs into the leather or fur. Then, a formic acid-based pH adjustment system (3.6-4.0) is used to break the emulsion, releasing small essential oil molecules that are then adsorbed by a multiple adsorption system. The leather or fur is then dried, smoothed, and softened. Next, both sides of the leather or the flesh side of the fur are surface-finished. Finally, a resin emulsion is sprayed onto both sides of the leather or the flesh side of the fur to seal and slow down essential oil evaporation. The product is then sealed and packaged as a finished leather or fur product.
2. The method for manufacturing leather or fur with a durable natural fragrance according to claim 1, characterized in that... ； The animal hide is one of the following: pigskin, cowhide, sheepskin, horsehide, fish skin, crocodile skin, snake skin, rabbit skin, fox skin, or mink skin; Before tanning, the animal hides are subjected to salt immersion treatment using one of the following non-biologically toxic substances: sodium sulfate, sodium hexametaphosphate, or sodium aluminosilicate. The chromium-free tanning agent is one of the following: aldehydes, epoxy tanning agents, oxazolidine, synthetic zeolite, triazine derivatives, vegetable tanning agents, and aluminum triformate. The plant tannins mentioned are one type of hydrolyzable tannins or condensed tannins; The natural plant essential oil is one or more of the following: citrus essential oil, sandalwood essential oil, eucalyptus essential oil, patchouli essential oil, lavender essential oil, rose essential oil, clove essential oil, and peppermint essential oil. In the oil emulsion, the mass percentage of natural plant essential oil is 5%~10%, and the mass percentage of emulsifier is 90%~95%. The emulsifier is a sulfonated vegetable oil, which is a sulfonated product of one or more of monoglycerides, diglycerides, or triglycerides. The surface finishing involves brushing the grain surface of leather or the flesh side of fur with 180-240 grit sandpaper. The resin emulsion is a polyurethane resin emulsion or an acrylic resin emulsion, and the resin emulsion contains 1.0% to 1.2% silicone oil by mass.