A hot melt cotton formed by animal leather fiber bundles with nano-scale branches

Abstract

The present invention discloses a hot melt cotton formed by an animal leather fiber bundle with nano-scale branches, including an animal leather fiber bundle with nano-scale branches, the animal leather fiber bundle with nano-scale branches includes an animal leather fiber main body, the animal leather fiber main body has nano-scale branches, at least one interweaving point of the mesh structure has a hot melt bonding point formed by hot melt fibers, and of course, other textile fibers can be added to the hot melt cotton. With this structure, the connection strength is high, and at the same time, the structure with independent and separated nano-scale branches presents the characteristics of good antibacterial effect, good adsorption performance, and the ability to improve mechanical properties.

Description

Technical Field

[0001] The invention relates to hot-melt cotton formed by animal leather fiber bundles with nano-level branches. Background Art

[0002] Hot melt cotton is a material formed by mixing fibers with hot melt fibers and then heating them. However, existing fibers are generally made of chemical fibers and natural fibers other than collagen fibers. However, due to the bonding points and materials of these fibers, the performance of hot melt cotton needs to be improved.

[0003] As we know, leather is a common product in people's daily life. At present, leather mainly includes animal leather and imitation leather. "Animal leather" refers to products made of raw hides. With the development of industry, people have developed many forms of imitation leather. Imitation leather is generally made of cloth made of chemical fiber as the base material, and then PU, PVC or other resin materials are used on one side of the above base material by coating or laminating to make a product that looks very similar to animal leather. This kind of product is also called: artificial leather, synthetic leather, etc.

[0004] "Animal leather" is made from raw hides peeled off from animals and processed through a series of physical and chemical treatments to form leather with certain acid resistance, alkali resistance, moisture resistance and heat resistance. It removes almost all non-fiber substances and maintains the original weaving state and structure of collagen fiber bundles (i.e. animal leather fiber bundles).

[0005] The raw material "hide" for leather making has the following properties before being processed:

[0006] (1) The skin peeled off from the animal body is wet. After drying, it becomes hard and loses its flexibility and softness, and it breaks easily when bent.

[0007] (2) Wet raw hides and skins will quickly rot, shed, and stink when placed in hot and humid conditions.

[0008] (3) In hot water above 65°C, rawhide will shrink. The higher the temperature, the greater the degree of shrinkage.

[0009] (4) Raw hides have poor air permeability and water vapor permeability, which means they are not hygienic.

[0010] (5) Raw hides and skins are easily damaged by chemicals.

[0011] Due to the above properties of raw hides, raw hides cannot be directly made into daily necessities for people to use. Therefore, people make leather from raw hides through a series of physical and chemical treatments. Although leather is obtained by physical and chemical treatment of raw hides, the morphology and structure of the collagen fiber bundles in leather are basically the same as those in raw hides.

[0012] The leather obtained by processing raw hides is favored by people because it does not become a hard and brittle material, does not rot, does not shrink, has good air permeability and water vapor permeability, and has good chemical resistance.

[0013] In terms of layers, animal leather is divided into two layers: the grain layer and the reticular layer. The collagen fiber bundles in the grain layer and the reticular layer are different in thickness, density and weaving form. The collagen fiber bundles in the grain layer are thin, and the diameter of the collagen fiber bundles in the grain layer close to the reticular layer is generally less than ten microns. The closer the grain layer is to the epidermis, the thinner the collagen fiber bundles are. In the grain layer, the closer the collagen fiber bundles are to the epidermis, the smaller the weaving angle of the collagen fiber bundles is, and they gradually become parallel to the surface of the epidermis, and the fiber weaving is also tighter.

[0014] In the process of processing animal leather, after the epidermis and hair are removed, the surface of the grain layer is uneven, shaped like a nipple, so the grain layer is also called the nipple layer. Therefore, the uneven shape of animal leather also forms the natural pattern of the finished animal leather. The collagen fiber bundles in the reticular layer of animal leather are thicker than those in the grain layer. The diameter of the collagen fiber bundles in the reticular layer is 20-150 microns and they are tightly woven. The weaving forms are generally divided into three categories: diamond weaving, curved weaving, and wavy weaving. Therefore, the reticular layer is the main part and role of the mechanical strength of animal leather such as tear resistance. The grain layer and the reticular layer are connected by loosely woven collagen fiber bundles, and some people call it the transition layer.

[0015] Animal leather is mainly composed of collagen fiber bundles, and also contains a small amount of other elastic fibers, reticular fibers, sweat glands, blood vessels, etc. Therefore, the various properties of animal leather depend on the collagen fiber bundles, especially the affinity and comfort of the grain layer in animal leather to the human body, which comes from the extremely fine collagen fiber bundles. Collagen fibers do not fork, but gather into bundles, while collagen fiber bundles have branches. The process of collagen fiber bundle formation is as follows: protocollagen molecule → protofibril (diameter 1.2-1.7nm) → subfibril (diameter 3-5nm) → protofibril (diameter generally 20nm) → fine fiber (diameter 2-5μm) → collagen fiber bundle (diameter 20-150μm). Protocollagen molecule is a right-handed composite helical structure formed by three left-handed helical collagen peptide chains. The collagen peptide chain is composed of a helical chain and a non-helical terminal peptide connected to it. Both the helical chain and the non-helical terminal peptide are composed of amino acid sequences. Although the amino acid composition and sequence of collagen vary due to different sources and collagen types, the composition of several major amino acids is roughly the same, namely glycine, alanine, proline and hydroxyproline. Although the formation process of collagen fiber bundles has nano-scale protofibrils, sub-fibrils and fibrils, the state of collagen fibers in animal skins or leather products does not exist as independent, isolated collagen fiber bundles with nano-scale branches.

[0016] The more the collagen fiber bundles are combed, the thinner and shorter they become. In addition, the thinner and shorter the collagen fiber bundles are, the more branches they have. However, existing textbooks, patent documents, papers and other documents only record that the collagen fiber bundles are combed to a state where they can be used to make imitation leather base materials. No one has ever thought of or achieved the process of combing the collagen fiber bundles multiple times to make the collagen fiber bundles reach or approach the fineness of the collagen fiber bundles in the grain layer of animal leather to produce an artificial grain layer, so that the structure and properties of the artificial grain layer are extremely similar to those of the grain layer in animal leather.

[0017] In the prior art, the "similar grain layer" seen on the imitation leather is made of plastic raw materials such as PU and PVC. For example, in the patent document with Chinese patent application number 201210072419.9, a surface treatment method for a collagen fiber nonwoven substrate is disclosed, which firstly processes the surface fibers of the collagen fiber nonwoven substrate with uniform thickness to be flat and fine, then creates a layer of similar grain surface layer, and then sprays water on the similar grain surface layer in sequence, creates leather texture, processes softness and flatness, and finally uses conventional processes to perform surface color treatment and surface emphasis treatment on the similar grain surface layer. The advantages of the present invention are: the method avoids the conventional use of release paper media to create a surface on the surface of the substrate, the product is close to the effect of the first layer of genuine leather, shows the appearance and properties of animal leather, has a simple process, and is low in cost. The obtained product, whether the substrate or any material used, meets the environmental protection requirements of the export and domestic markets, and reaches the physical property indicators of animal leather such as resistance to dry and wet friction, resistance to normal temperature bending, and resistance to cold bending, and reaches the wet friction detection standard of 200 times, and resistance to dry and wet rubbing 4-5 levels. It is also disclosed that the grain-like surface layer is manufactured according to the following method: the raw material of the grain-like surface layer is evenly smoothed on the surface of the substrate with a roller coater, 2-5 g / sf is applied with a scraping roller for the first time, and 10-20 g / sf is applied with a No. 17 roller after drying. Obviously, the grain layer currently made of non-leather is made of chemical raw materials. Although such a grain layer can imitate the grain layer of leather in appearance, its comfort and environmental protection cannot meet the requirements of the grain layer of animal leather. Moreover, there is no record in the prior art of using collagen fiber bundles formed by decomposition and combing to form collagen fiber bundles close to the fineness of animal leather grain layer to make artificial grain layer and leather material with extremely similar performance to animal leather grain layer.

[0018] The recycling of leather scraps has a long history, but in the past it did not attract widespread attention from people in and outside the industry. In the past 20 years, with the development of molecular biology and people's in-depth understanding of collagen and its properties, its application field has become more extensive; therefore, the resource utilization of leather scraps is no longer just the use of waste dandruff to produce low-value-added products such as recycled leather, but has been given new content, that is, to strive for high-value-added transformation. Since collagen fiber is an important functional substance that constitutes the animal body and it has unparalleled biocompatibility and biodegradability than other synthetic polymer materials. Therefore, as a natural biomass resource, the importance and economic status of collagen fiber (i.e. animal leather fiber) in the food, medicine, cosmetics, feed, fertilizer and other industries are becoming increasingly prominent.

[0019] Based on the above background, the inventor has conducted in-depth research on the reuse of leather scraps, applied for domestic and foreign patents, and put them into actual production, such as Chinese patent application No. 200410034435.4, 200410090255.8, 200410097268.8, 200410097268.8, 200510036778.9, 200710003092.9, 200710090219.5, 201010211811.8, 201020236921.5, 201621302339.8, etc., all of which involve collagen fibers. The above collagen fibers studied by the inventor are obtained by gradually loosening the collagen fibers in leather scraps or leather in a woven state under the hydraulic action of a liquid debonding machine. However, in previous research and implementation, only the collagen fibers in leather scraps or leather were loosened to form animal leather fibers with a main body and gradual branches. In the study, it was found that nano-scale materials will produce properties unique to non-nano-scale materials. Therefore, it is of great significance to study and implement independent and separated nano-scale animal leather fiber branches and their processing methods. Summary of the invention

[0020] The purpose of the present invention is to provide a hot-melt cotton formed by an animal leather fiber bundle with nano-scale branches. By utilizing this structure, the connection strength is high. At the same time, it has a structure of independent and separated nano-scale branches attached to the animal leather fiber body, showing good antibacterial effect, good adsorption performance, and the ability to improve mechanical properties.

[0021] The first technical solution to achieve the above-mentioned purpose is a hot-melt cotton formed by an animal leather fiber bundle with nano-scale branches, including an animal leather fiber bundle with nano-scale branches, the animal leather fiber bundle with nano-scale branches includes an animal leather fiber main body, the animal leather fiber main body has nano-scale branches, the animal leather fiber main body and its nano-scale branches are interwoven to form a criss-cross mesh structure, and at least one interweaving point of the mesh structure has a hot-melt bonding point formed by hot-melt fibers.

[0022] The animal leather fiber bundles with nano-scale branches in the above structure are obtained by liquid decomposition, opening, and multi-pass combing, that is, they are obtained by physical manufacturing processes, which not only maintain the length of the animal leather fiber bundles required for spinnability, but also meet the requirements of the fineness of the main body of the animal leather fibers, and at the same time obtain the animal leather fiber bundles with nano-scale branches. Therefore, in each process link of forming the animal leather fiber bundles with nano-scale branches, especially in the combing process link, the process of forming the animal leather fiber bundles with nano-scale branches is different from the existing process. Specifically, after the animal leather fiber bundles are extracted from the animal leather or animal leather scraps by liquid decomposition, their structures are different from each other, and it is necessary to use a transfer device with an identification function in the combing process after opening to separate the required animal leather fiber bundles with nano-scale branches, so as to obtain spinnable animal leather fiber bundles with nano-scale branches.

[0023] Compared with the primary fibrils, subfibrils and fibrils in the process of collagen fiber formation, the animal leather fiber bundle with nano-scale branches exists independently and separately and is attached to the main body of the animal leather fiber. There is a significant difference in the number of morphological structures per unit length between the primary fibrils, subfibrils and fibrils. For the animal leather fiber bundle with nano-scale branches, the specific surface area of ​​the nano-scale branches is significantly increased, so that the animal leather fiber bundle not only exerts its own performance but also produces new functions, that is, it produces a great adsorption function. The adsorption function is generated due to the generation of independent and separate nano-scale branches. The animal leather fiber bundle is formed by amino acid sequences to form peptide chains, and then the peptide chains form collagen molecules. This special component in the animal leather fiber bundle makes the animal leather fiber bundle have a "blue shift" phenomenon in optical properties, so the absorption capacity of ultraviolet light is stronger. Based on the improved ultraviolet adsorption capacity of the animal leather fiber bundle with nano-scale branches, and through detection and comparison, its antibacterial effect is very good, and the sterilization rate can reach more than 95%, which greatly exceeds the inherent antibacterial properties of existing fiber materials.

[0024] In addition, the collagen molecule is a right-handed composite helix of procollagen composed of three left-handed α-chains entangled with each other, which is the collagen helix, and the collagen helix is ​​the secondary structure of collagen. The high stability of the secondary structure of collagen is mainly due to the inter-chain hydrogen bonds and the intra-molecule and inter-molecule covalent cross-linking. So far, the first cross-linking structures confirmed are mainly Schiff base cross-linking, β-hydroxyaldehyde cross-linking and hydroxyaldehyde histidine cross-linking. As for the animal leather fiber bundles with nanoscale branches, the nanoscale branches have high activity and are extremely unstable due to the increased number of surface atoms, insufficient atomic coordination and high surface energy. They are easily combined with other atoms. Based on the covalent cross-linking effect between the chains, the nanoscale branches are easily combined with the animal leather fiber body, non-nanoscale branches and other nanoscale branches, and it is also easy for the animal leather fiber bundles to have more hot-melt interweaving points with the hot-melt fibers. At the same time, the nanoscale branches are attached to the animal leather fiber body, and the animal leather fiber body and the nanoscale branches are easily interwoven with each other to form a network structure. The leather fiber body and at least one interweaving point of the nanoscale branches are consolidated together through hot-melt bonding points, thereby improving the mechanical properties such as the connection strength of the hot-melt cotton.

[0025] The second technical solution to achieve the above-mentioned purpose is a hot-melt cotton formed by an animal leather fiber bundle with nano-scale branches, including an animal leather fiber bundle with nano-scale branches and other textile fibers. The animal leather fiber bundle with nano-scale branches includes an animal leather fiber main body, and the animal leather fiber main body has nano-scale branches. The animal leather fiber main body, the nano-scale branches and its other textile fibers are interwoven to form a criss-cross mesh structure, and at least one interweaving point of the mesh structure has a hot-melt bonding point formed by the hot-melt fiber.

[0026] The animal leather fiber bundles with nano-scale branches in the above structure are obtained by liquid decomposition, opening, and multi-pass combing, that is, they are obtained by physical manufacturing processes, which not only maintain the length of the animal leather fiber bundles required for spinnability, but also meet the requirements of the fineness of the main body of the animal leather fibers, and at the same time obtain the animal leather fiber bundles with nano-scale branches. Therefore, in each process link of forming the animal leather fiber bundles with nano-scale branches, especially in the combing process link, the process of forming the animal leather fiber bundles with nano-scale branches is different from the existing process. Specifically, after the animal leather fiber bundles are extracted from the animal leather or animal leather scraps by liquid decomposition, their structures are different from each other, and it is necessary to use a transfer device with an identification function in the combing process after opening to separate the required animal leather fiber bundles with nano-scale branches, so as to obtain spinnable animal leather fiber bundles with nano-scale branches.

[0027] Compared with the primary fibrils, subfibrils and fibrils in the process of collagen fiber formation, the animal leather fiber bundle with nano-scale branches exists independently and separately and is attached to the main body of the animal leather fiber. There is a significant difference in the number of morphological structures per unit length between the primary fibrils, subfibrils and fibrils. For the animal leather fiber bundle with nano-scale branches, the specific surface area of ​​the nano-scale branches is significantly increased, so that the animal leather fiber bundle not only exerts its own performance but also produces new functions, that is, it produces a great adsorption function. The adsorption function is generated due to the generation of independent and separate nano-scale branches. The animal leather fiber bundle is formed by amino acid sequences to form peptide chains, and then the peptide chains form collagen molecules. This special component in the animal leather fiber bundle makes the animal leather fiber bundle have a "blue shift" phenomenon in optical properties, so the absorption capacity of ultraviolet light is stronger. Based on the improved ultraviolet adsorption capacity of the animal leather fiber bundle with nano-scale branches, and through detection and comparison, its antibacterial effect is very good, and the sterilization rate can reach more than 95%, which greatly exceeds the inherent antibacterial properties of existing fiber materials.

[0028] In addition, the collagen molecule is a right-handed composite helix of procollagen composed of three left-handed α-chains entangled with each other, which is the collagen helix, and the collagen helix is ​​the secondary structure of collagen. The high stability of the secondary structure of collagen is mainly due to the inter-chain hydrogen bonds and the intra-molecule and inter-molecule covalent cross-linking. So far, the first cross-linking structures confirmed are mainly Schiff base cross-linking, β-hydroxyaldehyde cross-linking and hydroxyaldehyde histidine cross-linking. As for the animal leather fiber bundles with nano-scale branches, the nano-scale branches have high activity and are extremely unstable due to the increased number of surface atoms, insufficient atomic coordination and high surface energy. They are easy to combine with other atoms. Based on the covalent cross-linking effect between the chains, the nano-scale branches are easy to combine with the animal leather fiber body, non-nano-scale branches and other nano-scale branches, and it is also easy for the animal leather fiber bundles to have more hot-melt interweaving points with the hot-melt fibers. At the same time, the nano-scale branches are attached to the animal leather fiber body, and the animal leather fiber body provides greater mechanical strength for the animal leather fiber bundles. In addition, the animal leather fiber body, nano-scale branches and other textile fibers are easy to interweave with each other to form a network structure. The leather fiber body, nano-scale branches and at least one interweaving point of other textile fibers are consolidated together through hot-melt bonding points, thereby improving the mechanical properties such as the connection strength of the hot-melt cotton.

[0029] Furthermore, the nanoscale branches include nanoscale branches having a diameter of less than 200 nm.

[0030] Furthermore, the other textile fibers include other textile fibers with curling properties. By adding other textile fibers with curling properties, the elasticity of the hot-melt cotton can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of hot-melt cotton according to Example 1 of the present invention.

[0032] Figure 2 This is an enlarged view of the hot-melt cotton in Example 1.

[0033] Figure 3 Schematic diagram of animal leather fiber bundles with nanoscale branches.

[0034] Figure 4 This is an electron microscope image of animal leather fiber bundles before combing.

[0035] Figure 5 This is an electron microscope image of the nanoscale branches of animal leather fiber bundles after combing.

[0036] Figure 6 Another electron microscope image of animal leather fiber bundles with nanoscale branches.

[0037] Figure 7 This is the third electron micrograph of animal leather fiber bundles with nanoscale branches.

[0038] Figure 8 This is a schematic diagram of hot-melt cotton according to Example 2 of the present invention.

[0039] Fig. 9 This is an enlarged view of the hot-melt cotton in Example 2 of the present invention.

[0040] Fig.10 This is a schematic diagram of hot-melt cotton according to Example 3 of the present invention.

[0041] Fig.11 This is an enlarged view of the hot-melt cotton in Example 3 of the present invention. DETAILED DESCRIPTION

[0042] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0043] Example 1.

[0044] like Figure 1 and Figure 2 As shown, the hot melt cotton formed by the animal leather fiber bundle with nano-scale branches includes an animal leather fiber bundle 100 with nano-scale branches, and the animal leather fiber bundle 100 with nano-scale branches includes an animal leather fiber body 200, and the animal leather fiber body is a spinnable animal leather fiber body, such as Figures 3 to 7As shown, the animal leather fiber body 200 has non-nanoscale branches 201 and nanoscale branches 202, and the animal leather fiber body 200, the non-nanoscale branches 201 and the nanoscale branches 202 are interwoven to form a criss-cross mesh structure, and at least one interweaving point of the mesh structure has a hot melt bonding point 300 formed by hot melt fibers. The nanoscale branches include nanoscale branches with a diameter of less than 200nm.

[0045] The animal leather fiber bundles with nano-scale branches in the above structure are obtained by liquid decomposition, opening, and multi-pass combing, that is, they are obtained by physical manufacturing processes, which not only maintain the length of the animal leather fiber bundles required for spinnability, but also meet the requirements of the fineness of the main body of the animal leather fibers, and at the same time obtain the animal leather fiber bundles with nano-scale branches. Therefore, in each process link of forming the animal leather fiber bundles with nano-scale branches, especially in the combing process link, the process of forming the animal leather fiber bundles with nano-scale branches is different from the existing process. Specifically, after the animal leather fiber bundles are extracted from the animal leather or animal leather scraps by liquid decomposition, their structures are different from each other, and it is necessary to use a transfer device with an identification function in the combing process after opening to separate the required animal leather fiber bundles with nano-scale branches, so as to obtain spinnable animal leather fiber bundles with nano-scale branches.

[0046] Compared with the primary fibrils, subfibrils and fibrils in the process of collagen fiber formation, the animal leather fiber bundle with nano-scale branches exists independently and separately and is attached to the main body of the animal leather fiber. There is a significant difference in the number of morphological structures per unit length between the primary fibrils, subfibrils and fibrils. For the animal leather fiber bundle with nano-scale branches, the specific surface area of ​​the nano-scale branches is significantly increased, so that the animal leather fiber bundle not only exerts its own performance but also produces new functions, that is, it produces a great adsorption function. The adsorption function is generated due to the generation of independent and separate nano-scale branches. The animal leather fiber bundle is formed by amino acid sequences to form peptide chains, and then the peptide chains form collagen molecules. This special component in the animal leather fiber bundle makes the animal leather fiber bundle have a "blue shift" phenomenon in optical properties, so the absorption capacity of ultraviolet light is stronger. Based on the improved ultraviolet adsorption capacity of the animal leather fiber bundle with nano-scale branches, and through detection and comparison, its antibacterial effect is very good, and the sterilization rate can reach more than 95%, which greatly exceeds the inherent antibacterial properties of existing fiber materials.

[0047] In addition, the collagen molecule is a right-handed composite helix of procollagen composed of three left-handed α-chains entangled with each other, which is the collagen helix, and the collagen helix is ​​the secondary structure of collagen. The high stability of the secondary structure of collagen is mainly due to the inter-chain hydrogen bonds and the intra-molecule and inter-molecule covalent cross-linking. So far, the first cross-linking structures confirmed are mainly Schiff base cross-linking, β-hydroxyaldehyde cross-linking and hydroxyaldehyde histidine cross-linking. For animal leather fiber bundles with nano-scale branches, the nano-scale branches have high activity and are extremely unstable due to the increased number of surface atoms, insufficient atomic coordination and high surface energy. They are easily combined with other atoms. Based on the covalent cross-linking effect between the chains, the nano-scale branches are easily combined with the animal leather fiber body, non-nano-scale branches and other nano-scale branches, and it is also easy for the animal leather fiber bundles to have more hot-melt interweaving points with the hot-melt fibers. At the same time, the nano-scale branches are attached to the animal leather fiber body, and the animal leather fiber body and the nano-scale branches are easily interwoven with each other to form a network structure. The leather fiber body and at least one interweaving point of the nano-scale branches are consolidated together through hot-melt bonding points, thereby improving the mechanical properties such as the connection strength of the hot-melt cotton.

[0048] Example 2.

[0049] like Figure 8 and Fig. 9 As shown, the hot melt cotton formed by the animal leather fiber bundle with nano-scale branches includes the animal leather fiber bundle with nano-scale branches 100 and other textile fibers 21. The animal leather fiber bundle with nano-scale branches 100 includes an animal leather fiber body 200, and the animal leather fiber body is a spinnable animal leather fiber body, such as Figures 3 to 7 As shown, the animal leather fiber main body 200 has non-nanoscale branches 201 and nanoscale branches 202. In this embodiment, the other textile fibers are formed by hot-melt fibers with a core body after hot melting. The animal leather fiber main body 200, the non-nanoscale branches 201, the nanoscale branches 202 and other textile fibers are interwoven to form a criss-cross mesh structure; at least one interweaving point of the mesh structure has a hot-melt bonding point 300 formed by the hot-melt fibers. The nanoscale branches include nanoscale branches with a diameter of less than 200nm.

[0050] The animal leather fiber bundles with nano-scale branches in the above structure are obtained by liquid decomposition, opening, and multi-pass combing, that is, they are obtained by physical manufacturing processes, which not only maintain the length of the animal leather fiber bundles required for spinnability, but also meet the requirements of the fineness of the main body of the animal leather fibers, and at the same time obtain the animal leather fiber bundles with nano-scale branches. Therefore, in each process link of forming the animal leather fiber bundles with nano-scale branches, especially in the combing process link, the process of forming the animal leather fiber bundles with nano-scale branches is different from the existing process. Specifically, after the animal leather fiber bundles are extracted from the animal leather or animal leather scraps by liquid decomposition, their structures are different from each other, and it is necessary to use a transfer device with an identification function in the combing process after opening to separate the required animal leather fiber bundles with nano-scale branches, so as to obtain spinnable animal leather fiber bundles with nano-scale branches.

[0051] Compared with the primary fibrils, subfibrils and fibrils in the process of collagen fiber formation, the animal leather fiber bundle with nano-scale branches exists independently and separately and is attached to the main body of the animal leather fiber. There is a significant difference in the number of morphological structures per unit length between the primary fibrils, subfibrils and fibrils. For the animal leather fiber bundle with nano-scale branches, the specific surface area of ​​the nano-scale branches is significantly increased, so that the animal leather fiber bundle not only exerts its own performance but also produces new functions, that is, it produces a great adsorption function. The adsorption function is generated due to the generation of independent and separate nano-scale branches. The animal leather fiber bundle is formed by amino acid sequences to form peptide chains, and then the peptide chains form collagen molecules. This special component in the animal leather fiber bundle makes the animal leather fiber bundle have a "blue shift" phenomenon in optical properties, so the absorption capacity of ultraviolet light is stronger. Based on the improved ultraviolet adsorption capacity of the animal leather fiber bundle with nano-scale branches, and through detection and comparison, its antibacterial effect is very good, and the sterilization rate can reach more than 95%, which greatly exceeds the inherent antibacterial properties of existing fiber materials.

[0052] In addition, the collagen molecule is a right-handed composite helix of procollagen composed of three left-handed α-chains entangled with each other, which is the collagen helix, and the collagen helix is ​​the secondary structure of collagen. The high stability of the secondary structure of collagen is mainly due to the inter-chain hydrogen bonds and the intra-molecule and inter-molecule covalent cross-linking. So far, the first cross-linking structures confirmed are mainly Schiff base cross-linking, β-hydroxyaldehyde cross-linking and hydroxyaldehyde histidine cross-linking. As for the animal leather fiber bundles with nano-scale branches, the nano-scale branches have high activity and are extremely unstable due to the increased number of surface atoms, insufficient atomic coordination and high surface energy. They are easy to combine with other atoms. Based on the covalent cross-linking effect between the chains, the nano-scale branches are easy to combine with the animal leather fiber body, non-nano-scale branches and other nano-scale branches, and it is also easy for the animal leather fiber bundles to have more hot-melt interweaving points with the hot-melt fibers. At the same time, the nano-scale branches are attached to the animal leather fiber body, and the animal leather fiber body provides greater mechanical strength for the animal leather fiber bundles. In addition, the animal leather fiber body, nano-scale branches and other textile fibers are easy to interweave with each other to form a network structure. The leather fiber body, nano-scale branches and at least one interweaving point of other textile fibers are consolidated together through hot-melt bonding points, thereby improving the mechanical properties such as the connection strength of the hot-melt cotton.

[0053] Example 3.

[0054] like Fig.10 and Fig.11 As shown, the hot melt cotton formed by the animal leather fiber bundle with nano-scale branches includes the animal leather fiber bundle with nano-scale branches 100 and other textile fibers 21. The animal leather fiber bundle with nano-scale branches 100 includes an animal leather fiber body 200, and the animal leather fiber body is a spinnable animal leather fiber body, such as Figures 3 to 7 As shown, the animal leather fiber main body 200 has non-nanoscale branches 201 and nanoscale branches 202. In this embodiment, the other textile fibers include other curly textile fibers. The animal leather fiber main body 200, the non-nanoscale branches 201, the nanoscale branches 202 and other textile fibers are interwoven to form a criss-cross mesh structure; at least one interweaving point of the mesh structure has a hot melt bonding point 300 formed by hot melt fibers. The nanoscale branches include nanoscale branches with a diameter of less than 200nm.

[0055] The animal leather fiber bundles with nano-scale branches in the above structure are obtained by liquid decomposition, opening, and multi-pass combing, that is, they are obtained by physical manufacturing processes, which not only maintain the length of the animal leather fiber bundles required for spinnability, but also meet the requirements of the fineness of the main body of the animal leather fibers, and at the same time obtain the animal leather fiber bundles with nano-scale branches. Therefore, in each process link of forming the animal leather fiber bundles with nano-scale branches, especially in the combing process link, the process of forming the animal leather fiber bundles with nano-scale branches is different from the existing process. Specifically, after the animal leather fiber bundles are extracted from the animal leather or animal leather scraps by liquid decomposition, their structures are different from each other, and it is necessary to use a transfer device with an identification function in the combing process after opening to separate the required animal leather fiber bundles with nano-scale branches, so as to obtain spinnable animal leather fiber bundles with nano-scale branches.

[0056] Compared with the primary fibrils, subfibrils and fibrils in the process of collagen fiber formation, the animal leather fiber bundle with nano-scale branches exists independently and separately and is attached to the main body of the animal leather fiber. There is a significant difference in the number of morphological structures per unit length between the primary fibrils, subfibrils and fibrils. For the animal leather fiber bundle with nano-scale branches, the specific surface area of ​​the nano-scale branches is significantly increased, so that the animal leather fiber bundle not only exerts its own performance but also produces new functions, that is, it produces a great adsorption function. The adsorption function is generated due to the generation of independent and separate nano-scale branches. The animal leather fiber bundle is formed by amino acid sequences to form peptide chains, and then the peptide chains form collagen molecules. This special component in the animal leather fiber bundle makes the animal leather fiber bundle have a "blue shift" phenomenon in optical properties, so the absorption capacity of ultraviolet light is stronger. Based on the improved ultraviolet adsorption capacity of the animal leather fiber bundle with nano-scale branches, and through detection and comparison, its antibacterial effect is very good, and the sterilization rate can reach more than 95%, which greatly exceeds the inherent antibacterial properties of existing fiber materials.

[0057] In addition, the collagen molecule is a right-handed composite helix of procollagen composed of three left-handed α-chains entangled with each other, which is the collagen helix, and the collagen helix is ​​the secondary structure of collagen. The high stability of the secondary structure of collagen is mainly due to the inter-chain hydrogen bonds and the intra-molecule and inter-molecule covalent cross-linking. So far, the first cross-linking structures confirmed are mainly Schiff base cross-linking, β-hydroxyaldehyde cross-linking and hydroxyaldehyde histidine cross-linking. As for the animal leather fiber bundle with nano-scale branches, the nano-scale branches have high activity and are extremely unstable due to the increase in the number of surface atoms, insufficient atomic coordination and high surface energy. They are easy to combine with other atoms. Based on the covalent cross-linking effect between the chains, the nano-scale branches are easy to combine with the animal leather fiber body, non-nano-scale branches and other nano-scale branches, and it is also easy to make the animal leather fiber bundle and the hot-melt fiber hot-melt interweaving points more. At the same time, the nano-scale branches are attached to the animal leather fiber body, and the animal leather fiber body provides greater mechanical strength for the animal leather fiber bundle. In addition, the animal leather fiber body, nano-scale branches and other textile fibers are easy to interweave with each other to form a mesh structure. The leather fiber body, nano-scale branches and at least one interweaving point of other textile fibers are consolidated together through hot-melt bonding points, thereby improving the mechanical properties such as the connection strength of the hot-melt cotton. In addition, when other curled textile fibers are added, the elasticity of the hot-melt cotton can be increased.

Claims

1. A hot melt cotton formed by animal leather fiber bundles with nano-scale branches, characterized in that: The invention comprises an animal leather fiber bundle with nano-scale branches, wherein the animal leather fiber bundle with nano-scale branches comprises an animal leather fiber main body, the animal leather fiber main body has nano-scale branches, the animal leather fiber main body and the nano-scale branches are interwoven to form a criss-cross mesh structure, and at least one interweaving point of the mesh structure has a hot-melt bonding point formed by hot-melt fibers; the nano-scale branches comprise nano-scale branches with a diameter of less than 200 nm; The animal leather fiber bundles with nano-scale branches are obtained through liquid detangling, opening, and multi-pass combing; in the combing process after opening, a transfer device with an identification function is used to separate the required animal leather fiber bundles with nano-scale branches.

2. A hot melt cotton formed by animal leather fiber bundles with nano-scale branches, characterized in that: The invention comprises an animal leather fiber bundle with nano-scale branches and other textile fibers, wherein the animal leather fiber bundle with nano-scale branches comprises an animal leather fiber main body, the animal leather fiber main body has nano-scale branches, the animal leather fiber main body, the nano-scale branches and other textile fibers are interwoven to form a criss-cross network structure, and at least one interweaving point of the network structure has a hot-melt bonding point formed by hot-melt fibers; the nano-scale branches comprise nano-scale branches with a diameter of less than 200 nm; The animal leather fiber bundles with nano-scale branches are obtained through liquid detangling, opening, and multi-pass combing; in the combing process after opening, a transfer device with an identification function is used to separate the required animal leather fiber bundles with nano-scale branches.

3. The hot melt cotton formed by animal leather fiber bundles with nano-scale branches according to claim 2, characterized in that: Other textile fibers include other textile fibers having curl.

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