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CN-122011653-A - Bamboo fiber recyclable express environment-friendly bag and preparation method thereof

CN122011653ACN 122011653 ACN122011653 ACN 122011653ACN-122011653-A

Abstract

The invention discloses a bamboo fiber recyclable express environment-friendly bag and a preparation method thereof, and belongs to the technical field of green packaging materials and sustainable logistics equipment. The environment-friendly bag is formed by carrying out melt coextrusion on modified bamboo fibers, bioactive polyolefin and amino two-dimensional molybdenum disulfide to prepare a 60-100 mu m film and then carrying out heat sealing. The modified bamboo fiber is prepared by alkali liquor pretreatment, ultrasonic cleaning, plasma activation and amination MoS2 coating, the bioactive polyolefin is obtained by grafting maleic anhydride through plasma, and the amination MoS2 synchronously realizes the functions of interface enhancement, lubrication antifriction, antibiosis and bacteriostasis and heat stability improvement. The invention solves the problems of serious pollution of the traditional plastic express bags and insufficient performance of the existing biodegradable bags, and provides an efficient solution for green transformation in the express industry.

Inventors

  • HU GUORONG
  • SHEN YOULIANG

Assignees

  • 湖南成美高新科技有限公司

Dates

Publication Date
20260512
Application Date
20260311

Claims (9)

  1. 1. The bamboo fiber recyclable express environment-friendly bag is characterized by comprising, by mass, 5-40% of modified bamboo fibers, 60-95% of bioactive polyolefin and 0.1-5% of amino two-dimensional molybdenum disulfide; the composite material is prepared into a film body with the thickness of 60-100 mu m by a melting and co-extrusion process, the tensile strength of the environment-friendly bag is more than or equal to 45MPa, the tearing strength is more than or equal to 30N/mm, and the antibacterial rate to escherichia coli and staphylococcus aureus is more than 99.9%.
  2. 2. The bamboo fiber recyclable express environment-friendly bag is characterized in that the modified bamboo fiber is prepared by heating the bamboo fiber to 60-80 ℃ at 1-3 ℃ per min in 1-5% NaOH solution or mixed alkali solution containing 0.5-1.5% Na 2 SO 3 , preserving heat for 60-120min, performing ultrasonic cleaning, performing normal pressure plasma treatment for 0.5-30min under the gas pressure of 10-10000Pa and the discharge power of 10-800W, and then coating and drying by using an amination two-dimensional molybdenum disulfide ethanol solution.
  3. 3. The bamboo fiber recyclable express environment-friendly bag is characterized in that the amination two-dimensional molybdenum disulfide is prepared by introducing amino (-NH 2 ) and sulfhydryl (-SH) functional groups on the surface of MoS 2 through a chemical grafting method, and the grafting rate is 25-35%.
  4. 4. The bamboo fiber recyclable express environmentally friendly bag according to claim 1, wherein the bioactive polyolefin is prepared by plasma-assisted grafting of maleic anhydride.
  5. 5. A method for preparing the bamboo fiber recyclable express environment-friendly bag according to any one of claims 1 to 4, comprising the following steps: (1) Pretreating bamboo fiber, namely adding the bamboo fiber into alkali liquor, heating and preserving heat, and cleaning to neutrality; (2) Modifying bamboo fiber, namely performing ultrasonic cleaning and normal pressure plasma treatment, and then coating and drying by using an amination two-dimensional molybdenum disulfide ethanol solution; (3) Preparing bioactive polyolefin, namely grafting maleic anhydride on polyolefin resin through plasma; (4) Mixing and molding, namely mixing the components according to the proportion, melting and blending at 170-210 ℃ by a double screw extruder, and heat-sealing to prepare bags after film formation.
  6. 6. The preparation method according to claim 5, wherein the alkali liquor in the step (1) is a NaOH solution with a mass fraction of 1-5% or a mixed alkali liquor containing 0.5-1.5% Na 2 SO 3 , the solid-liquid ratio is 1:10-20, the heating rate is 1-3 ℃ per minute, the heat preservation temperature is 60-80 ℃ and the heat preservation time is 60-120min.
  7. 7. The method according to claim 5, wherein the ultrasonic cleaning parameters in the step (2) are 40kHz frequency and 300W power, and the cleaning time is 15-30min; the gas pressure of normal pressure plasma treatment is 10-10000Pa, the discharge power is 10-800W, the treatment time is 0.5-30min, the concentration of the amination two-dimensional molybdenum disulfide ethanol solution is 0.5-2wt%, the drying temperature is 80-100 ℃ after coating, and the drying time is 1-2h.
  8. 8. The process according to claim 5, wherein the polyolefin resin in the step (3) is a Linear Low Density Polyethylene (LLDPE) or polypropylene (PP), the gas pressure of the plasma-assisted grafting maleic anhydride is 1-100Pa, the discharge power is 4-120W, the treatment time is 0.1-100min, and the grafting ratio of maleic anhydride is 1.2-2.5%.
  9. 9. The preparation method according to claim 5, wherein the melt blending temperature of the twin-screw extruder in the step (4) is 170-210 ℃, the rotation speed of the main machine is 10-40 rpm, the film forming mode is extrusion, casting or calendaring, the film thickness is 60-100 μm, the heat sealing bag making temperature is 150-180 ℃, and the heat sealing pressure is 0.3-0.5MPa.

Description

Bamboo fiber recyclable express environment-friendly bag and preparation method thereof Technical Field The invention relates to the technical field of green packaging materials and sustainable logistics equipment, in particular to a bamboo fiber recyclable express environment-friendly bag and a preparation method thereof. Background With the rapid development of express, electronic commerce and modern logistics industry, the express business volume in China continuously rises. Currently, more than about 90% of express packages rely on petroleum-based plastic materials such as Polyethylene (PE), polypropylene (PP), etc., which are derived from non-renewable fossil energy sources, and consume 3-5 tons of crude oil per ton in the production process. The traditional plastic express bags have the defects of difficult degradation, serious white pollution caused by long degradation period of 200-500 years in natural environment, low recovery rate, low actual recycling rate of less than 10 percent due to serious pollution and difficult classification, single mechanical property, lack of functions of antibiosis, wear resistance, heat resistance and the like, and difficulty in meeting the requirements of frequent transportation, extrusion and friction in express transportation, and fourth, high carbon footprint, remarkable carbon emission from raw material extraction to waste treatment and about 2.8 tons of CO 2 per ton of traditional PE express bags. Although the prior art attempts to replace traditional plastics by adopting biodegradable materials such as starch base, PLA and the like, the problems of poor mechanical strength (tensile strength is less than or equal to 25 MPa), high cost (which is 3-5 times that of the traditional PE bag), high processing difficulty (narrow forming temperature interval and easy degradation) and the like generally exist, and the actual use requirements of express packaging cannot be met. Therefore, the invention provides the novel environment-friendly express bag which has the advantages of high strength, long service life, easy recovery, multifunction integration and sustainable source, and a full life cycle green circulation system of production, use, recovery and regeneration is constructed. Disclosure of Invention The invention aims to overcome the defects of the prior art, and provides a bamboo fiber recyclable express environment-friendly bag and a preparation method thereof, and the unification of environmental friendliness, mechanical properties and economy is realized by innovating a material formula and a process. The invention provides a bamboo fiber recyclable express environment-friendly bag, which comprises, by mass, 5-40% of a bamboo fiber, 60-95% of a bioactive polyolefin and 0.1-5% of an amino two-dimensional molybdenum disulfide; The composite material is prepared into a film body with the thickness of 60-100 mu m by a melting and co-extrusion process, the tensile strength of the environment-friendly bag is more than or equal to 45MPa, the tearing strength is more than or equal to 30N/mm, and the antibacterial rate to escherichia coli and staphylococcus aureus is more than 99.9%. Further, the modified bamboo fiber is prepared by heating the bamboo fiber to 60-80 ℃ at 1-3 ℃ per min in 1-5% NaOH solution or mixed alkali solution containing 0.5-1.5% Na 2SO3, preserving heat for 60-120min, performing ultrasonic cleaning, performing normal pressure plasma treatment for 0.5-30min under the gas pressure of 10-10000Pa and the discharge power of 10-800W, and then coating and drying by using an amination two-dimensional molybdenum disulfide ethanol solution. Further, the amination two-dimensional molybdenum disulfide is prepared by introducing amino (-NH 2) and sulfhydryl (-SH) functional groups on the surface of MoS 2 by a chemical grafting method, and the grafting rate is 25-35%. Further, the bioactive polyolefin is prepared by plasma assisted grafting of maleic anhydride. The preparation method of the bamboo fiber recyclable express environment-friendly bag is characterized by comprising the following steps of: (1) Pretreating bamboo fiber, namely adding the bamboo fiber into alkali liquor, heating and preserving heat, and cleaning to neutrality; (2) Modifying bamboo fiber, namely performing ultrasonic cleaning and normal pressure plasma treatment, and then coating and drying by using an amination two-dimensional molybdenum disulfide ethanol solution; (3) Preparing bioactive polyolefin, namely grafting maleic anhydride on polyolefin resin through plasma; (4) Mixing and molding, namely mixing the components according to the proportion, melting and blending at 170-210 ℃ by a double screw extruder, and heat-sealing to prepare bags after film formation. Further, the alkali liquor in the step (1) is NaOH solution with the mass fraction of 1-5% or mixed alkali liquor containing 0.5-1.5% Na 2SO3, the solid-liquid ratio is 1:10-20, the heating rate is 1-3 ℃ per minute, the heat p