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US-20260125834-A1 - Flash fabric having high tensile resilience

US20260125834A1US 20260125834 A1US20260125834 A1US 20260125834A1US-20260125834-A1

Abstract

A flash fabric having a high tensile resilience, including the polyethylene raw material. The gram weight G of the flash fabric is greater than 35 g/m 2 ; the tensile resilience (RT) of the flash fabric is 40%-70%; and the aging toughness Z 5 of the flash fabric is 5-15 (N·m)/g, where Z 5 =[R M5 ×E M5 +R T5 ×E T5 ]/G. By means of improvements of the spinning raw materials and the process, the comprehensive performance of the product is improved.

Inventors

  • KONGMENG YE
  • Boyi Chen

Assignees

  • Jiangsu Kingwills New Material Co., Ltd.

Dates

Publication Date
20260507
Application Date
20251230
Priority Date
20230711

Claims (14)

  1. 1 . A flash fabric having a high tensile resilience, comprising the polyethylene raw material, the gram weight G of the flash fabric is greater than 35 g/m 2 ; the tensile resilience (RT) of the flash fabric is 40%-70%; and the aging toughness Z 5 of the flash fabric is 5-15 (N·m)/g; wherein Z 5 =[R M5 ×E M5 +R T5 ×E T5 ]/G; the technological process of aging treatment is as follows: (1) placing a sample under the conditions of 25±1° C. and the relative humidity of 65±2% for 24 hours, then measuring the tensile strength in the machine direction (MD) (denoted as R M ), the tensile strength in the transverse direction (TD) (denoted as R T ), the tensile elongation in the MD direction (denoted as E M ), and the tensile elongation in the TD direction (denoted as E T ) of the sample respectively; then calculating the initial toughness Z 0 according to the formula; (2) then exposing the sample to a dry heat atmosphere at 90±1° C. for 6 hours, followed by cooling under the conditions of 25±1° C. and the relative humidity of 65±2% for 24 hours; and (3) finally, repeating the operation in step (2), and after four additional treatments, measuring the tensile strength in the MD direction (denoted as R M5 ), the tensile strength in the TD direction (denoted as R T5 ), the tensile elongation in the MD direction (denoted as E M5 ), and the tensile elongation in the TD direction (denoted as E T5 ) of the sample respectively; and calculating Z 5 according to the formula; the tensile resilience (RT) is tested by the FB1 method of a KES fabric style tester.
  2. 2 . The flash fabric having a high tensile resilience according to claim 1 , wherein the gram weight G of the flash fabric is less than 70 g/m 2 .
  3. 3 . The flash fabric having a high tensile resilience according to claim 1 , wherein the tensile resilience of the flash fabric is 50%-55%.
  4. 4 . The flash fabric having a high tensile resilience according to claim 1 , wherein the tensile resilience of the flash fabric is 55%-60%.
  5. 5 . The flash fabric having a high tensile resilience according to claim 1 , wherein the aging toughness Z 5 of the flash fabric is 8-10 (N·m)/g.
  6. 6 . The flash fabric having a high tensile resilience according to claim 1 , wherein the aging toughness Z 5 of the flash fabric is 10-12 (N·m)/g.
  7. 7 . The flash fabric having a high tensile resilience according to claim 1 , wherein the aging toughness Z 5 of the flash fabric is 12-14 (N·m)/g.
  8. 8 . The flash fabric having a high tensile resilience according to claim 1 , wherein the toughness variation value ΔZ of the flash fabric is 15%-45%; wherein ΔZ=[Z 0 −Z 5 ]/Z 0 ×100% Z 0 is the initial toughness, which is the sample's Z 0 =[R M ×E M +R T ×E T ]/G; and Z 5 is the final toughness after high-temperature treatment, and Z 5 =[R M5 ×E M5 +R T5 ×E T5 ]/G.
  9. 9 . The flash fabric having a high tensile resilience according to claim 8 , wherein the toughness variation value ΔZ of the flash fabric is 15%-20%.
  10. 10 . The flash fabric having a high tensile resilience according to claim 9 , wherein the toughness variation value ΔZ of the flash fabric is 25%-30%.
  11. 11 . The flash fabric having a high tensile resilience according to claim 1 , characterized by exposing a polyethylene film material of the flash fabric to a dry heat atmosphere at 90° C. for 6 hours, followed by cooling under the conditions of 25±1° C. and the relative humidity of 65±2% for 24 hours; then measuring the transmittance T of the flash fabric to be 7%-15%; the transmittance test is conducted according to GBT2410-2008, and the transmittance T is the ratio of the luminous flux passing through the sample to the luminous flux incident on the sample, expressed as a percentage.
  12. 12 . The flash fabric having a high tensile resilience according to claim 11 , wherein the light transmittance T of the flash fabric is 9%-10%.
  13. 13 . The flash fabric having a high tensile resilience according to claim 11 , wherein the light transmittance T of the flash fabric is 10%-11%.
  14. 14 . The flash fabric having a high tensile resilience according to claim 1 , wherein a polymer spinning raw material further comprises a spinning aid, and the spinning aid is nano-hollow carbon spheres loaded with zinc oxide.

Description

TECHNICAL FIELD The present invention belongs to the field of flash technology, and particularly relates to a flash fabric having a high tensile resilience. BACKGROUND Flash spinning is a spinning method in which a polymer solution is placed above the boiling point of a solvent and extruded through a spinneret under high pressure to achieve atmospheric pressure. The polymers are generally polyethylene, polypropylene and their analogs, and the solvents are halogenated hydrocarbons and their analogs, etc. The typical feature of the flash spinning is phase separation, during the dissolution process, the polymer and solvent are stirred and transformed into a homogeneous solution under high temperature and pressure; in a low-pressure chamber, slightly reducing its pressure causes the solution to undergo a certain degree of phase separation, forming two-liquid-phase solutions, one of which is a high polymer-rich phase and the other is a solvent-rich phase; and when the final solution enters the ambient temperature and pressure air through spinneret holes, the solvent is converted into vapor and rapidly separates from the polymer. Chinese Patent Publication No. CN115491783A relates to a high-strength flash-spun textile and a manufacturing method thereof, where the raw material includes polyethylene, the gram weight is 35-45 g/m2, the front burst index is 4-12 kPa·m2/g; the back burst index is 3-12 kPa·m2/g; the printing surface strength is less than 0.42 m/s; the dynamic friction coefficient is 0.08-0.25; and the antibacterial rate is greater than 97%. The high-strength flash-spun textile prepared in the present application has good antibacterial properties, printability and excellent hand feel. Chinese Patent Publication No. CN114990712A relates to a flash fabric and an application thereof, where the wet transverse tensile strength after being soaked in deionized water at 40° C. is 1600-1900 N/m, the wet longitudinal tensile strength after being soaked in deionized water at 40° C. is 2800-3100 N/m, the dynamic friction coefficient is 0.1-0.25; and the gram weight is 35-45 g/m2. The present application can be used in the field of medical protection, various protective clothing, etc. Chinese Patent Publication No. CN114687069A relates to a multifunctional polymer non-woven fabric and a fabric thereof, where the attenuation rate ▴E of the elongation at break is 0.20-0.50; ▴E=1−E2/E1; E1 represents the elongation at break of the multifunctional polymer non-woven fabric that has not undergone aging test treatment; E2 is the elongation at break of the multifunctional polymer non-woven fabric after aging test treatment; and the value of E2 is less than 0.5. The process of the present application is simple and widely applicable. Publication No. WO2015195898A1 relates to a paper, which includes a plexifilamentary structure having a normalized Frazier air permeability between 0.002 and 0.2 m3/(m2·minute) @50 gsm and a normalized water head between 150 and 250 cm @50 gsm. European Patent EP3736126A1 relates to a package for providing a sterilizable closed internal environment, and a breathable fibrous non-woven sheet structure for such a structure, wherein the non-woven sheet structure has at least one surface with a pre-sealed embossed pattern; and the particle barrier penetration rate is less than 10%, the Gurley Hill porosity is 40 seconds or less, and the moisture transmission rate is 3500 g/m2/day or higher. Japanese Patent JP6722596B2 relates to a flash-spun plexifilamentary fiber bundle having a total crystallinity index of less than or equal to 55%, where the flash-spun plexifilamentary fiber strand is less than or equal to 12 m2/g, the crush value is greater than or equal to 0.9 mm/g, the fiber bundle includes predominantly a fiber formed from a polyethylene homopolymer, and the fiber has a monoclinic and orthorhombic structure as determined by an X-ray analysis, and a crystal of the monoclinic structure; and the sheet is characterized in that the degree is greater than 1%. U.S. Patent US20160016385A1 relates to a laminated structure including a microporous film bonded in a face to face relationship with a plexifilamentary non-woven web with an adhesive layer situated in contact with at least a portion of both the microporous film and the non-woven web, where the film contains filler in an amount between 30% and 50% by weight of the total film weight, and between 40% and 90% of polyolefin polymer by weight of the total film weight, the film has a thickness of between 12 and 25 microns, the film is bonded to the plexifilamentary web by adhesive, the laminated structure has a water vapor transmission rate (WVTR) as measured by the EN ISO 12572 Climate C method of greater than or equal to 1000 g/m2/day, the basis weight of the laminated structure is at least 55 g/m2, the tensile strength of the laminated structure according to EN ISO 13934-1 is at least 35 Newtons in the machine direction, the tensile elongation of th