CN117604785A - Method for preparing bio-based leather by using fungus fruiting body - Google Patents
Method for preparing bio-based leather by using fungus fruiting body Download PDFInfo
- Publication number
- CN117604785A CN117604785A CN202311529763.0A CN202311529763A CN117604785A CN 117604785 A CN117604785 A CN 117604785A CN 202311529763 A CN202311529763 A CN 202311529763A CN 117604785 A CN117604785 A CN 117604785A
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- CN
- China
- Prior art keywords
- leather
- modified
- bio
- fruiting body
- fungus fruiting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/12—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins
- D06N3/14—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins with polyurethanes
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- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/0056—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the compounding ingredients of the macro-molecular coating
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- D—TEXTILES; PAPER
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- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/0056—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the compounding ingredients of the macro-molecular coating
- D06N3/0059—Organic ingredients with special effects, e.g. oil- or water-repellent, antimicrobial, flame-resistant, magnetic, bactericidal, odour-influencing agents; perfumes
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- D—TEXTILES; PAPER
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- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/0056—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the compounding ingredients of the macro-molecular coating
- D06N3/0063—Inorganic compounding ingredients, e.g. metals, carbon fibres, Na2CO3, metal layers; Post-treatment with inorganic compounds
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- D06N2209/00—Properties of the materials
- D06N2209/10—Properties of the materials having mechanical properties
- D06N2209/103—Resistant to mechanical forces, e.g. shock, impact, puncture, flexion, shear, compression, tear
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- D06N2209/00—Properties of the materials
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- D06N2209/123—Breathable
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- D06N2209/00—Properties of the materials
- D06N2209/16—Properties of the materials having other properties
- D06N2209/1607—Degradability
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- D06N2209/00—Properties of the materials
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- D06N2211/00—Specially adapted uses
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- D06N2211/00—Specially adapted uses
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- D06N2211/00—Specially adapted uses
- D06N2211/12—Decorative or sun protection articles
- D06N2211/28—Artificial leather
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Dispersion Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
Abstract
The invention discloses a method for preparing bio-based leather by using fungus fruiting bodies, and belongs to the technical field of bio-based materials. The method of the invention comprises the following steps: firstly, pulverizing fungus fruiting bodies, and carrying out surface grafting modification in an aqueous medium to obtain modified fungus fruiting bodies; then mixing with water to form fungus fruiting body dispersion liquid, adding modified cellulose short fiber and anti-settling agent, and stirring uniformly to obtain fungus fruiting body slurry; then adding water-based polyurethane, plasticizer, pore-forming agent and cross-linking agent, stirring uniformly, dehydrating, concentrating, extruding and drying to obtain the fungus fruiting body composite bass; and (5) processing the composite bass according to a conventional processing method of the microfiber leather to obtain a biological base leather finished product. The bio-based leather prepared by the method can achieve the appearance and performance similar to those of natural leather, the preparation process is environment-friendly and pollution-free, the bio-based content of the finished leather is high, the bio-based leather has good degradability, and the bio-based leather has application value in the fields of bags, home furnishings, clothing decoration and the like.
Description
Technical Field
The invention relates to a method for preparing bio-based leather by using fungus fruiting bodies, belonging to the technical field of bio-based materials.
Background
The natural leather has long history, but the natural leather has limited raw leather quantity, and the production process is a process with high energy consumption and high pollution, which brings great load to the environment. In recent years, new requirements are also put on the safety of natural leather, toxic chemicals such as hexavalent chromium, pentachlorophenol, free formaldehyde and the like in the natural leather are strictly limited, and great pressure is caused to the development of the natural leather.
Based on this, enterprises and researchers are accelerating the development of new materials for replacing natural leather, in which ultra fine fiber synthetic leather becomes the best material for replacing natural leather with its excellent properties. However, a large amount of organic solvents are used in the production process of the superfine fiber synthetic leather, and the used superfine fiber has few hydrophilic groups and poor absorption and transmission capacity of moisture, so that the moisture absorption and perspiration performances are greatly different from those of the natural leather. Therefore, the searching of novel raw materials with excellent performance for leather product development has great significance.
Chinese patent CN109736097a discloses that hydrophilic bacterial cellulose is introduced into the conventional super fiber, so that the air permeability and water vapor permeability of leather are improved. Chinese patent CN115418866A, CN113638237a all discloses a method for preparing novel leather materials using plant bast fibers such as pineapple leaf fibers, coconut shell fibers, hemp fibers. CN111455681a discloses a method for preparing novel leather materials by steaming and pulping from agricultural and forestry wastes such as crop straw and wood.
In addition, leather based on natural materials or waste, such as apple, pineapple, cactus, has received increasing attention. Among the many natural sources, fruiting bodies are of spore-forming construction of higher fungi, composed of organized mycelium, a renewable natural source, which can be produced by fermentation processes and culture media, inoculation and incubation. The culture medium can be agricultural biomass or industrial waste, the obtained fruiting body is quite complex in shape and different in shape according to fungus, and umbrella shape, pen shape, head shape, ear shape, tongue shape, sphere shape, flower shape, tree shape and the like are all included in the fruiting body, such as mushrooms and fungi eaten in daily life. The sporophore has good hydrophilicity, porous structure, wide sources of production raw materials, low price, no environmental pollution in the production process, and carbon dioxide consumption, thus being a real carbon negative material.
The preparation of bio-based leather products based on fruit bodies is of great importance to both economy and environment; however, the simple fruiting body material is difficult to prepare into leather products, and the leather products are directly compounded with polyurethane in the form of filling materials, so that the leather products have the problems of poor interfacial phase tolerance with polyurethane, small filling amount, poor wear resistance, poor mechanical properties and the like.
Disclosure of Invention
Aiming at the defects and shortcomings in the prior art, namely the problems that the real fungus fruiting body has good hydrophilicity, high moisture content, incapability of being directly compounded with the traditional solvent polyurethane, high energy consumption for compounding after drying, poor interface compatibility between the fruiting body and the polyurethane and the like. The invention provides a method for preparing bio-based leather by using fungus fruiting bodies, which comprises the steps of carrying out surface grafting modification on the fruiting bodies, pulping, grinding, and then adding aqueous polyurethane in situ to prepare leather base cloth, thereby obtaining leather products with excellent air permeability, wear resistance and mechanical properties.
A first object of the present invention is to provide a method for preparing bio-based leather using fungal fruiting bodies, the method comprising the steps of:
(1) Pulverizing fungus fruiting body, and performing surface grafting modification in water medium to obtain modified fungus fruiting body; then mixing with water, crushing, disc-grinding to form fungus fruiting body dispersion liquid, adding modified cellulose short fibers and an anti-settling agent, and uniformly stirring to obtain fungus fruiting body slurry;
(2) Adding aqueous polyurethane, plasticizer, pore-forming agent and cross-linking agent into the fungal fruit body slurry prepared in the step (1), uniformly stirring, dehydrating, concentrating, extruding, drying, performing heat water treatment to remove the pore-forming agent, and drying to obtain the fungal fruit body composite bass;
(3) Polishing, veneering and embossing the fungus fruiting body composite bass prepared in the step (3) according to a conventional processing method of microfiber leather to prepare a biobased leather finished product based on fungus fruiting bodies.
In one embodiment, the fungal fruit body in step (1) comprises one or more of flammulina velutipes, agrocybe cylindracea, pleurotus eryngii, white beech mushroom, hericium erinaceus, morchella or north fungus.
In one embodiment, the surface grafting modification in the step (1) specifically refers to coating tannins on the surface of fungus fruiting bodies in an aqueous solution, and preparing modified fungus fruiting bodies with octadecyl grafted on the surface by utilizing Schiff base reaction of tannins and octadecyl ammonia.
In one embodiment, the mass ratio of the modified fungus fruiting body of step (1) to water is 1:1-2.
In one embodiment, the crushing in the step (1) is performed by a high-speed crusher with the rotating speed of 20000 to 25000r/min
In one embodiment, the disc grinding in the step (1) means that the disc grinding is performed on a disc grinder, and the disc grinding rotating speed is 1000-2000r/min.
In one embodiment, the modified cellulose staple fiber in the step (1) refers to a hydrophobic modification of cellulose, including one or more of modified viscose fiber, modified tencel fiber, modified bacterial cellulose, modified cotton linter, modified bamboo fiber, and modified fibrilia.
In one embodiment, the modified cellulosic staple fiber of step (1) has a fiber length of 5-10mm and is added in an amount of 30-60% (w/w) of the dry weight of the fungal fruit body.
In one embodiment, the modified viscose staple fiber of step (1) is prepared by:
drying unmodified viscose staple fibers in an oven to remove water, adding the dried viscose staple fibers into lactide in a molten state, adding stannous octoate catalyst, reacting for 2-5 hours at 100-120 ℃, taking out the viscose staple fibers, and removing ungrafted polylactic acid components on the surfaces of the viscose staple fibers by using methylene dichloride to obtain the modified viscose fibers with polylactic acid chain segments grafted on the surfaces.
In one embodiment, the anti-settling agent of step (1) is one or more of carboxymethyl cellulose, sodium alginate, or starch.
In one embodiment, the anti-settling agent of step (1) is added in an amount of 1-5% w/w based on dry weight of fungal fruit body.
In one embodiment, the fungal fruit body slurry of step (1) has an apparent viscosity of from 1 to 3Pa.s.
In one embodiment, the aqueous polyurethane in the step (2) is bio-based aqueous polyurethane, and the addition amount is 10-50% of the dry weight of the fungal fruit body, w/w.
In one embodiment, the plasticizer of step (2) is one or more of glycerol, propylene glycol, or dibutyl phthalate.
In one embodiment, the plasticizer is added in step (2) in an amount of 1-5% w/w of the dry weight of the fungal fruit body.
In one embodiment, the pore-forming agent in the step (2) is one or more of polyethylene glycol, polyvinylpyrrolidone or NaCl salt particles with a molecular weight of 20000 g/mol.
In one embodiment, the porogen of step (2) is added in an amount of 1-3% w/w of the dry weight of the fungal fruit body.
In one embodiment, the crosslinker of step (2) is one or more of citric acid, butane tetracarboxylic acid, or ethylene glycol diglycidyl ether.
In one embodiment, the amount of the cross-linking agent added in step (2) is 1-10% w/w of the dry weight of the fungal fruit body.
In one embodiment, the dehydration and drying in step (2) is suction filtration dehydration, the drying temperature is 100-130 ℃ and the time is 20-30 min, and the crosslinking reaction occurs simultaneously in the process.
A second object of the present invention is to provide a finished biobased leather product prepared by the above-described method.
The third object of the invention is to provide an application of the bio-based leather finished product in the fields of luggage, shoes and decoration.
The invention has the beneficial effects that:
(1) The bio-based leather prepared by the invention can achieve the appearance and performance similar to those of natural leather, the whole preparation process is environment-friendly and pollution-free, the prepared finished leather has high bio-based content and good degradability, and the product has application value in the fields of fashion, bags, home furnishings, clothing decoration and the like.
(2) The invention prepares the fungus fruiting body into the aqueous dispersion by crushing, pulping and grinding, so that the performance difference of different fruiting body forms and components on products is avoided, and the method has wide applicability; in addition, through the surface modification of the fungus fruiting body and the combination of the anti-settling agent, the uniform mixing of the fruiting body and the polyurethane is ensured, and the excellent interface interaction between the fruiting body and the polyurethane is also ensured; the surface modification in the water medium is used for replacing the surface modification in the solvent, and the aqueous polyurethane is used for replacing the solvent polyurethane, so that the environment-friendly polyurethane has the advantages of safety and environmental protection and small environmental pollution;
(3) The fungus fruiting body filling amount in the bio-based leather product prepared by the method is 50-80%, the bio-based content is 70-90%, and the water vapor permeability is 1-2.5mg/cm 2 H, the bending resistance is 1.5-3 ten thousand times, the abrasion resistance is 1200-2500 times, the breaking strength is 40-60MPa, the breaking elongation is 50-150%, and the comprehensive performance is excellent.
Detailed Description
The following description of the preferred embodiments of the present invention is provided for better illustration of the invention, and should not be construed as limiting the invention.
The invention relates to a testing method which comprises the following steps:
and (3) water vapor permeability test: the GB/T1811-1993 leather water vapor permeability test method is adopted.
Bending resistance test: the test was carried out using the method described in GB/T4689.9-1984.
Abrasion resistance performance test: the surface was observed by turning a certain number of turns under a load of 1kg with a wearing machine at 23.+ -. 2 ℃.
Mechanical property test: the sample was cut into 1X 10cm strips and subjected to a tensile test on a universal material tester at a tensile speed of 5cm/min.
The preparation method of the modified viscose fiber comprises the following steps:
firstly, 20g of unmodified viscose fiber is dried in an oven at 105 ℃ for 2 hours to remove water, then the modified viscose fiber with polylactic acid chain segments grafted on the surface is obtained by adding 20g of lactide in a molten state, adding stannous octoate with the mass of 5 per mill of the lactide as a catalyst, reacting at 120 ℃ for 5 hours, taking out the viscose fiber, and removing the polylactic acid components which are not grafted on the surface of the viscose fiber by using methylene dichloride.
Biobased aqueous polyurethane: purchased from Shenzhen Tongtai chemical technology Co., ltd., trade name LUR10.
Conventional unmodified viscose: the filaments with the specification of 120D/30F are purchased from Xinxiang chemical fiber stock Co., ltd and cut to the required length by self.
Example 1
A method for preparing bio-based leather using fungal fruiting bodies, the method comprising the steps of:
(1) Crushing flammulina velutipes into small blocks with the diameter of 2-5mm on a crusher, weighing 2.0g of small blocks of flammulina velutipes, putting the small blocks of flammulina velutipes into 98g of water, uniformly stirring, adding 0.4g of tannic acid, reacting for 24 hours at 25 ℃, then adding 100ml of 2.0% (w/w) octadecylamine ethanol solution, reacting for 24 hours at 50 ℃, and centrifuging after finishing to obtain modified flammulina velutipes;
(2) The needle mushrooms modified in the step (1) are mixed according to the mass ratio of 1:1 adding water, pulping into paste on a high-speed pulverizer of 20000r/min, further grinding on a disc grinder of 1500r/min, and uniformly mixing; adding modified viscose fiber with the length of 10mm into the modified viscose fiber according to 50% of the mass of the golden needle mushroom, uniformly dispersing the modified viscose fiber, and adding carboxymethyl cellulose serving as an anti-settling agent with the mass of 5% of the system solution to regulate the viscosity of the system solution to 2Pa.s, thereby obtaining golden needle mushroom slurry;
(3) Adding 30% of biological-based aqueous polyurethane of the dry weight of the flammulina velutipes into the flammulina velutipes slurry obtained in the step (2), adding 3% (w/w) of glycerol of the dry weight of the flammulina velutipes as a plasticizer, using 10% of NaCl salt particles of the dry weight of the flammulina velutipes as a pore-forming agent, and using 5% (w/w) of citric acid of the dry weight of the flammulina velutipes as a cross-linking agent, and uniformly stirring; vacuum filtering, dewatering, concentrating, squeezing at normal temperature, drying at 120deg.C for 30min, steaming in 50deg.C hot water for 10min, dissolving salt granule, and drying in 100 deg.C air drying oven to obtain composite base of needle mushroom, modified viscose fiber and polyurethane;
(4) Polishing, veneering and embossing the composite bass prepared in the step (3) according to a conventional processing method of microfiber leather to obtain a biological base leather finished product based on flammulina velutipes.
The filling amount of the fungus fruiting body flammulina velutipes in the leather product prepared in the embodiment is 55%, the content of the bio-based component is 88%, and the water vapor permeability is 1.8mg/cm 2 H, bending resistance is 2.2 ten thousand times, abrasion resistance is 2100 times, breaking strength is 52MPa, and breaking elongation is 90%.
Example 2
The difference from example 1 was that the amount of the modified viscose fiber in the step (2) was changed to 30% of the mass of needle mushroom, and other conditions and parameters were the same as those of example 1, to prepare a bio-based leather.
The filling amount of fruiting body needle mushroom in the leather product prepared in this example is 62%, the content of biobased components is 85%, and the water vapor permeability is 2.2mg/cm 2 H, bending resistance is 2.0 ten thousand times, abrasion resistance is 1800 times, breaking strength is 45MPa, and breaking elongation is 85%.
Example 3
The difference from example 1 was that the bio-based aqueous polyurethane in step (3) was added in an amount of 50% to dry weight of needle mushroom, and other parameters and conditions were the same as those of example 1, to prepare bio-based leather.
The leather product prepared in this example has a fungus fruiting body filling amount of 55%, a biobased component content of 86%, and a water vapor permeability of 1.3mg/cm 2 H, bending resistance is 2.5 ten thousand times, abrasion resistance is 2400 times, breaking strength is 58MPa, and breaking elongation is 120%.
Example 4
The difference from example 1 is that the modified viscose fiber in the step (2) is changed from 10mm to 5mm, and other parameters and conditions are the same as those of example 1, so that the bio-based leather is produced.
The filling amount of needle mushroom as fungus fruiting body prepared in this example is 55%, the content of bio-based component is 88%, and compared with example 1, the water vapor permeability is 1.8mg/cm 2 H, bending resistance is 2.0 ten thousand times, abrasion resistance is 1500 times, breaking strength is 48MPa, and breaking elongation is 75%.
Comparative example 1
The difference from example 1 is only that the needle mushroom modification treatment in the step (1) is omitted, and the needle mushrooms are directly crushed and the biological-based leather is prepared by referring to the methods and conditions in the steps (2) to (4).
The filling amount and the content of the bio-based components of the bio-based leather prepared in the comparative example are not greatly changed compared with those of the example 1, namely 55 percent and 88 percent respectively, and the water vapor permeability is measured to be 2.0mg/cm 2 H, bending resistance is 1.0 ten thousand times, abrasion resistance is 800 times, breaking strength is 25MPa, and breaking elongation is 30%.
The reason why the bending resistance, abrasion resistance and mechanical properties are greatly reduced compared with those of the embodiment 1 is that the interface difference between the unmodified flammulina velutipes and the polyurethane is large, and a large amount of flammulina velutipes are filled in the fruiting body, so that more defects exist in the leather product.
Comparative example 2
The difference from example 1 is only that the anti-settling agent carboxymethyl cellulose in step (2) was removed, and other parameters and conditions were the same as those of example 1 to prepare bio-based leather.
Compared with example 1, the biobased leather prepared in the comparative example has 58% of filling amount of flammulina velutipes fruiting body, and 85% of content of biobased components. The water vapor permeability is 1.6mg/cm 2 H, bending resistance is 1.3 ten thousand times, abrasion resistance is 1000 times, breaking strength is 38MPa, and breaking elongation is 45%.
The reason why the bending resistance, abrasion resistance and mechanical properties are reduced compared with those of example 1 is that the anti-settling agent is not available, the modified flammulina velutipes are easy to settle, a stable mixed solution cannot be formed with polyurethane, and further the flammulina velutipes are unevenly dispersed in the polyurethane, so that the properties of the final leather product are reduced.
Comparative example 3
The difference from example 1 is that the modified viscose fiber in the step (2) is changed to a conventional unmodified viscose fiber, and other parameters and conditions are the same as those of example 1, so that the bio-based leather is prepared.
Bio-based leather prepared in this comparative exampleThe filling amount and the content of the bio-based components of the needle mushroom of the fruiting body of the medium fungus are not greatly changed compared with those of the example 1, and are 55 percent and 88 percent respectively, and the water vapor permeability is measured to be 2.0mg/cm 2 H, bending resistance is 1.7 ten thousand times, abrasion resistance is 1000 times, breaking strength is 32MPa, and breaking elongation is 55%.
Viscose mainly plays roles in wear resistance and reinforcement in biological-based leather products, but the premise is that the interface effect with polyurethane is treated well, and if the viscose is directly added, the effect is obviously reduced, which is also the reason that the effect is not ideal in the comparative example.
Comparative example 4
The difference from example 1 was that the viscosity of the flammulina velutipes slurry in the step (2) was adjusted to 5Pa.s, and other parameters and conditions were the same as in example 1 to prepare a bio-based leather.
The filling amount and the content of the biobased components of the fungus fruiting body flammulina velutipes in the biobased leather prepared in the comparative example are not greatly changed compared with those in the example 1, and are 55% and 88% respectively, and the water vapor permeability is 1.6mg/cm 2 H, bending resistance is 1.2 ten thousand times, abrasion resistance is 800 times, breaking strength is 30MPa, and breaking elongation is 45%.
Too high viscosity of the slurry mainly influences the mixing effect with the polyurethane solution, thereby leading to the uniform dispersion degree of the fruiting body flammulina velutipes in the final leather product and influencing the wear resistance and mechanical properties.
The above examples are not intended to limit the scope of the invention nor the order of execution of the steps described. The present invention is obviously modified by a person skilled in the art in combination with the prior common general knowledge, and falls within the scope of protection defined by the claims of the present invention.
Claims (10)
1. A method for preparing bio-based leather using fungal fruit bodies, said method comprising the steps of:
(1) Pulverizing fungus fruiting body, and performing surface grafting modification in water medium to obtain modified fungus fruiting body; then mixing with water, crushing, disc-grinding to form fungus fruiting body dispersion liquid, adding modified cellulose short fibers and an anti-settling agent, and uniformly stirring to obtain fungus fruiting body slurry;
(2) Adding aqueous polyurethane, plasticizer, pore-forming agent and cross-linking agent into the fungal fruit body slurry prepared in the step (1), uniformly stirring, dehydrating, concentrating, extruding and drying to obtain the fungal fruit body composite bass;
(3) Polishing, veneering and embossing the fungus fruiting body composite bass prepared in the step (3) according to a conventional processing method of microfiber leather to prepare a biobased leather finished product based on fungus fruiting bodies.
2. The method of claim 1, wherein the fungal fruit body of step (1) comprises one or more of flammulina velutipes, agrocybe cylindracea, pleurotus eryngii, stropharia rugoso-annulata, hericium erinaceus, morchella or chaetomium.
3. The method of claim 1, wherein the surface grafting modification in step (1) specifically refers to coating the fungal fruiting body with tannic acid in an aqueous solution, and utilizing schiff base reaction of tannic acid and octadecyl ammonia to prepare the modified fruiting body with surface grafted octadecyl.
4. The method of claim 1, wherein the mass ratio of the modified fungal fruit body to water in step (1) is 1:1-2.
5. The method of claim 1, wherein the modified cellulose staple fiber in step (1) is a modified cellulose staple fiber that is modified by hydrophobization, and comprises one or more of modified viscose fiber, modified tencel fiber, modified bacterial cellulose, modified cotton linter, modified bamboo fiber, and modified fibrilia.
6. The method according to claim 1, wherein the modified cellulose staple fiber of step (1) has a fiber length of 5-10mm and is added in an amount of 30-60% w/w based on the dry weight of the fungal fruit body.
7. The method of claim 1, wherein the aqueous polyurethane in step (2) is a bio-based aqueous polyurethane added in an amount of 10-50% w/w based on the dry weight of the fungal fruit body.
8. The method according to claim 1, wherein the apparent viscosity of the fungal fruit body slurry of step (1) is 1 to 3pa.s.
9. A biobased leather finished product prepared by the method of any one of claims 1 to 8.
10. Use of the biobased leather finished product of claim 9 in the fields of luggage, footwear, and decoration.
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