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CN-122013346-A - Special nylon fabric for high-wear-resistance and tear-resistance knapsack

CN122013346ACN 122013346 ACN122013346 ACN 122013346ACN-122013346-A

Abstract

The invention belongs to the technical field of textile materials, and discloses a nylon fabric special for a high-wear-resistance and tear-resistance knapsack. The fabric is prepared by composite spinning of polyamide resin derived from bio-based pentanediamine and bacterial nanocellulose hydrophobically modified by a bioenzyme method, and the polyamide resin and the bacterial nanocellulose are synergistically enhanced by a molecular-level hydrogen bond interpenetrating network structure, so that the tear strength and the wear resistance are obviously improved on the premise of not increasing the gram weight and the hardness. According to the invention, the microbial synthesized nanocellulose and the bio-based polyamide are coupled at a molecular level to construct an interpenetrating network structure with high energy efficient dissipation capability, and the nylon fabric special for the high-wear-resistant and tear-resistant knapsack is novel in structure, excellent in performance and environment-friendly, and the comprehensive performance index of the nylon fabric meets the requirements of the high-end outdoor knapsack on high strength, high wear resistance, light weight, softness and sustainability of the high-performance sustainable fabric.

Inventors

  • HUANG GUOREN

Assignees

  • 广东恩典皮具服饰科技股份有限公司

Dates

Publication Date
20260512
Application Date
20260306

Claims (10)

  1. 1. The nylon fabric special for the high-wear-resistance and tear-resistance backpack is characterized by being prepared by composite spinning of polyamide resin derived from bio-based pentanediamine and bacterial nanocellulose subjected to hydrophobic modification by a biological enzyme method.
  2. 2. The nylon fabric special for the high-wear-resistance and tear-resistance backpack according to claim 1, wherein the bacterial nanocellulose serving as a nano reinforcing phase is uniformly dispersed in a polyamide matrix, and the bacterial nanocellulose and the polyamide matrix realize mechanical property cooperative reinforcement through a molecular-level hydrogen bond interpenetrating network structure.
  3. 3. The polyamide fabric special for the high abrasion-resistant and tear-resistant backpack according to claim 1, wherein the hydrophobic modification is catalyzed by lipase or laccase, long-chain fatty acid or alkylphenol hydrophobing agent with carbon chain length of C12-C18 is covalently grafted onto hydroxyl on the surface of bacterial nanocellulose, so that the water contact angle is increased from original 20 DEG to 30 DEG to 95 DEG to 110 deg.
  4. 4. The polyamide fabric special for the high-wear-resistance and tear-resistance backpack according to claim 1, wherein the polyamide resin is nylon 56 or nylon 510, and is formed by polycondensation of bio-based pentanediamine and adipic acid or sebacic acid respectively, and the intrinsic viscosity is 1.8-2.2dL/g or 1.6-2.0dL/g respectively.
  5. 5. The nylon fabric special for the high-wear-resistance and tear-resistance backpack according to claim 1, wherein the mass fraction of the hydrophobically modified bacterial nanocellulose in the composite system is 1% -5%.
  6. 6. The nylon fabric special for the high-abrasion-resistance and tear-resistance backpack according to claim 1, wherein the thickness of the fabric is 0.25-0.35mm, the warp tearing strength is greater than 120N, the weft tearing strength is greater than 100N, the Martindale abrasion-resistance times are greater than 50000 times, the bending rigidity warp direction is less than 35 mN.m, and the weft direction is less than 30 mN.m.
  7. 7. The nylon fabric special for the high-wear-resistance and tear-resistance backpack according to claim 1, wherein the bacterial nanocellulose is prepared by fermenting acetobacter xylinum under a static culture condition, and the solid content is adjusted to 3% -5% after alkaline boiling and water washing purification.
  8. 8. The polyamide fabric special for the high abrasion-resistant and tear-resistant backpack according to claim 3, wherein the hydrophobic modification is carried out under the conditions that the pH value is 5.0-6.5 and the temperature is 35-45 ℃, the lipase is immobilized lipase CAL-B from candida, the catalytic activity is more than 10000U/g, and the hydrophobic agent is at least one of lauric acid, stearic acid or nonylphenol.
  9. 9. The polyamide fabric special for the high-wear-resistance and tear-resistance backpack according to claim 2, wherein the hydrophobically modified bacterial nanocellulose and the polyamide matrix form double interface combination through an amide bond and a hydrogen bond, and are arranged in a melt spinning shearing field along the axial direction of the fiber to form a rigid nano skeleton penetrating through the polyamide matrix, and polyamide molecular chains are wound and permeated in gaps of the skeleton to form a flexible network.
  10. 10. The nylon fabric special for the high abrasion-resistant and tear-resistant backpack according to claim 9, wherein a multi-hole spinneret plate is adopted for melt spinning, the number of holes is 24-96 holes, the pore diameter is 0.25-0.35 mm, the spinning temperature is 250-280 ℃, the side blowing wind speed is 0.4-0.6 m/s, the winding speed is 3500-4500 m/min, and the fineness of the obtained multifilament monofilaments is 1.0-2.0 dtex, and the breaking strength is greater than 5.5 cN/dtex.

Description

Special nylon fabric for high-wear-resistance and tear-resistance knapsack Technical Field The invention belongs to the technical field of textile materials, and relates to a nylon fabric special for a high-wear-resistance and tear-resistance knapsack. Background art In the field of outdoor sports equipment and functional luggage manufacturing, nylon (polyamide) is widely used as a core fabric base material for a long time due to excellent mechanical properties, wear resistance and processing adaptability. The traditional technical path generally improves the tearing strength by improving the denier of nylon fibers or enhancing the twisting degree, increases the single fiber fineness, can improve the bearing capacity of unit sectional area, and inhibits the crack from expanding by increasing the friction force among fibers with high twist, and both strengthen the structural integrity of the fabric in the macroscopic mechanical level. However, the increase in fiber denier directly results in an increase in grammage per unit area, while the high twist process significantly reduces yarn flexibility, resulting in stiff hand feel and poor drape of the final fabric, thereby affecting the ergonomic fit and backpack experience of the backpack. Such reinforcement means trades for strength improvements at the expense of material flexibility and light weight, and it is difficult to meet the market's synchronous demands for high performance and high comfort. In this context, the industry has attempted to introduce inorganic nanofillers (e.g. silica, carbon nanotubes) or synthetic polymeric tougheners to improve the mechanical properties of chinlon. However, such methods often suffer from secondary problems such as poor dispersion uniformity, poor interfacial compatibility, high processing energy consumption or lack of biodegradability, which may not only impair the hand feel and dyeing properties of fabrics, but also contradict the current global advocated green low-carbon manufacturing trend. Disclosure of Invention In order to achieve the aim of the invention, the invention provides a nylon fabric special for a high-wear-resistance and tearing-resistance backpack, which is prepared by composite spinning of polyamide resin derived from bio-based pentanediamine and bacterial nanocellulose subjected to hydrophobic modification by a bioenzyme method, wherein the bacterial nanocellulose serving as a nano reinforcing phase is uniformly dispersed in a polyamide matrix, and the cooperative reinforcement of mechanical properties is realized through a molecular-level hydrogen bond interpenetrating network structure, so that the tear resistance and the wear resistance of the fabric are obviously improved on the premise of not increasing gram weight per unit area and fabric hardness. The preparation method of the nylon fabric special for the high abrasion-resistant and tear-resistant backpack comprises the following steps of firstly, carrying out microbial fermentation on acetobacter xylinum under static culture conditions to obtain high-purity bacterial nanocellulose hydrogel, secondly, carrying out pretreatment on the hydrogel to remove residual culture medium components and adjust the solid content of the hydrogel to 3% -5%, then adopting lipase or laccase as a biocatalyst, carrying out covalent grafting of long-chain fatty acid or alkylphenol hydrophobes onto hydroxyl on the surface of the bacterial nanocellulose in a reaction system with the pH value of 5.0-6.5 and the temperature of 35-45 ℃, realizing surface hydrophobicization modification of the bacterial nanocellulose, carrying out freeze drying on the obtained hydrophobically modified bacterial nanocellulose to obtain fluffy porous nanocellulose powder, mixing the powder with nylon 56 or nylon 510 slices obtained by polycondensation of bio-pentyenediamine and adipic acid or sebacic acid according to the mass ratio of 1:99-5:95, carrying out melt blending in a twin-screw extruder at the temperature of 240-270 ℃ to obtain composite spinning master batches, drying the composite master batches, carrying out melt spinning assembly, carrying out drying on the composite master batches, carrying out spinning at the temperature of 280-250 ℃ and the spinning speed of 0.3500 m/m, and carrying out high abrasion-resistant and tear-resistant spinning process to obtain the nylon fabric. The bacterial nanocellulose has the diameter of 20-100nm, the length of 500-2000nm, the crystallinity of more than 85% and the specific surface area of 80-150m 2/g. The lipase used in the hydrophobic modification process is immobilized lipase CAL-B derived from candida, the catalytic activity of the lipase is more than 10000U/g, the hydrophobic agent is at least one of lauric acid, stearic acid or nonylphenol, and the carbon chain length of the hydrophobic agent is C12-C18. After hydrophobic modification, the contact angle of the bacterial nanocellulose is increased from the original 20-30 degrees to