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CN-121973517-A - Degradable and aging-resistant paper-plastic composite woven bag and manufacturing method thereof

CN121973517ACN 121973517 ACN121973517 ACN 121973517ACN-121973517-A

Abstract

The application relates to the technical field of paper-plastic composite woven bags, and particularly discloses a degradable and aging-resistant paper-plastic composite woven bag and a manufacturing method thereof. A degradable and ageing-resistant paper-plastic composite woven bag comprises a paper bag layer and a plastic woven layer, wherein the plastic woven layer and the paper bag layer are formed by compositely bonding low-density polyethylene, and the plastic woven layer comprises polylactic acid, bamboo fibers, flax fibers, polycaprolactone, nano zinc oxide, polyglycerol fatty acid ester and an antioxidant. The retention rates of the paper-plastic composite woven bag obtained by the application are 91-97% and 92-97% respectively, the paper-plastic composite woven bag has higher ageing resistance, the radial tensile load and the weft tensile load are 943-952N/50mm and 883-900N/50mm respectively, and the highest decomposition rates of 180 days, 1 year and 2 years under the soil condition can reach 20.5%, 50.3% and 99.4% respectively, and the paper-plastic composite woven bag has higher mechanical property and degradability.

Inventors

  • CAO YUFEN
  • LI JIN
  • XIANG QIUSHENG
  • LIANG YIZHONG

Assignees

  • 河北恩鑫包装有限公司

Dates

Publication Date
20260505
Application Date
20260324

Claims (8)

  1. 1. The degradable ageing-resistant paper-plastic composite woven bag is characterized by comprising a paper bag layer and a plastic woven layer, wherein the plastic woven layer and the paper bag layer are formed by compounding and bonding low-density polyethylene; the plastic woven layer comprises, by weight, 70-85 parts of polylactic acid resin, 5-10 parts of bamboo fibers, 5-10 parts of flax fibers, 5-7 parts of polycaprolactone, 1-3 parts of nano zinc oxide, 1-1.5 parts of polyglycerol fatty acid ester and 0.6-1 part of antioxidants.
  2. 2. The degradable and aging-resistant paper-plastic composite woven bag according to claim 1, wherein the plastic woven layer comprises, by weight, 75-80 parts of polylactic acid resin, 7-9 parts of bamboo fibers, 7-9 parts of flax fibers, 5.5-6.5 parts of polycaprolactone, 1.5-2.5 parts of nano zinc oxide, 1.3-1.4 parts of polyglycerol fatty acid ester and 0.7-0.9 part of antioxidants.
  3. 3. The degradable and aging-resistant paper-plastic composite woven bag according to claim 1, wherein the mass ratio of polycaprolactone to nano zinc oxide is 1 (2-6).
  4. 4. The degradable and aging-resistant paper-plastic composite woven bag according to claim 1, wherein the nano zinc oxide is prepared by modification, and specifically comprises the following operation steps: S1, weighing nano zinc oxide, adding the nano zinc oxide into deionized water, and performing ultrasonic dispersion for 30-40min to obtain nano zinc oxide dispersion liquid; S2, adding sodium lignin sulfonate into the nano zinc oxide dispersion liquid, stirring and dissolving, regulating the pH to 7.5-8.5, heating to 60-70 ℃, stirring for 2-3 hours at a constant speed, adding polyhydroxyalkanoate, stirring for 1.5-2.5 hours at a constant temperature, centrifuging, collecting bottom sediment, washing with deionized water, vacuum drying, and crushing to obtain the modified nano zinc oxide.
  5. 5. The degradable and aging-resistant paper-plastic composite woven bag according to claim 4, wherein the addition amount of the sodium lignin sulfonate is 5-10% of the mass of the nano zinc oxide.
  6. 6. The degradable and aging-resistant paper-plastic composite woven bag according to claim 4, wherein the addition amount of the polyhydroxyalkanoate is 3-6% of the mass of the nano zinc oxide.
  7. 7. The degradable and aging-resistant paper-plastic composite woven bag according to claim 1, wherein the paper bag layer is any one of kraft paper and white kraft paper.
  8. 8. A method for preparing the degradable and aging-resistant paper-plastic composite woven bag as claimed in any one of claims 1 to 7, which is characterized by comprising the following operation steps: S1, uniformly mixing all raw materials of a plastic woven layer, putting the raw materials into a flat wire extruder, setting the extrusion temperature to be 160-180 ℃ and the stretching temperature to be 80-100 ℃, extruding and stretching to prepare flat wires, feeding the flat wires into a braiding machine, braiding the flat wires into a plastic woven cloth with the density of 12X 12 pieces/inch, and drying after braiding is finished to obtain the plastic woven layer for standby; S2, placing the printed paper bag layer and the plastic woven layer on a conveyor belt, coating the heated and melted low-density polyethylene on the surface of the plastic woven layer in a roller coating mode, then enabling the printed surface of the paper bag layer to be aligned outwards, laminating and conveying the printed surface of the plastic woven layer to be a gluing surface of the plastic woven layer, bonding, compounding, cooling, cutting, sealing and forming by using a wire, and cutting off connecting wires between adjacent paper-plastic compound woven bags to obtain the paper-plastic compound woven bag.

Description

Degradable and aging-resistant paper-plastic composite woven bag and manufacturing method thereof Technical Field The application relates to the technical field of paper-plastic composite woven bags, in particular to a degradable and aging-resistant paper-plastic composite woven bag and a manufacturing method thereof. Background The paper-plastic composite woven bag, also called as a three-in-one composite paper bag, is a composite packaging container with the characteristics of high strength of paper printing and plastic weaving, and is widely applied to the packaging field of powdery materials such as chemical raw materials, cement, feed, chemical fertilizers, grains, mineral powder and the like by virtue of the advantages of good mechanical properties, good printing suitability and the like, and becomes one of main stream products in the industrial packaging field. At present, the paper-plastic composite woven bag is mainly formed by compounding non-biodegradable plastics such as polypropylene, polyethylene and the like with paper materials, and has good strength and waterproof performance, but is not easy to degrade in natural environment, thus causing serious pollution to the environment. In recent years, with the rising of environmental awareness, research on degradable woven bags is gradually increased, but the mechanical property and ageing resistance of the existing degradable materials are generally lower than those of traditional plastics, and the requirements of high strength and ageing resistance of the woven bags in the actual use process are difficult to meet. In the related art, in order to improve the mechanical property and the ageing resistance of the degradable paper-plastic composite woven bag, a toughening agent and an antioxidant are added into raw materials, but the additives can reduce the degradability of the paper-plastic composite woven bag, and are difficult to complete. Therefore, a paper-plastic composite woven bag with high degradability, mechanical property and ageing resistance needs to be developed. Disclosure of Invention The application provides a degradable and aging-resistant paper-plastic composite woven bag and a manufacturing method thereof in order to improve the aging resistance of the paper-plastic composite woven bag. In a first aspect, the application provides a degradable and aging-resistant paper-plastic composite woven bag, which adopts the following technical scheme: The degradable aging-resistant paper-plastic composite woven bag comprises a paper layer and a plastic woven layer, wherein the woven plastic layer and the paper layer are formed by compounding and bonding low-density polyethylene; the plastic woven layer comprises, by weight, 70-85 parts of polylactic acid resin, 5-10 parts of bamboo fibers, 5-10 parts of flax fibers, 5-7 parts of polycaprolactone, 1-3 parts of nano zinc oxide, 1-1.5 parts of polyglycerol fatty acid ester and 0.6-1 part of antioxidants. By adopting the technical scheme, the polylactic acid is taken as the main raw material of the plastic woven layer, is a completely biodegradable material, can be decomposed into carbon dioxide and water by microorganisms in natural environment, has no environmental residue, and ensures that the plastic woven layer has degradability. And polylactic acid has certain basic weather resistance, and provides basic support for the ageing resistance of the paper-plastic composite woven bag. The bamboo fiber has high strength and good toughness, the flax fiber has excellent abrasion resistance and tear resistance, and the bamboo fiber and the flax fiber can form a uniformly dispersed fiber reinforced network in the polylactic acid matrix, so that the mechanical property of the plastic woven layer is effectively improved. And the fibers can disperse internal stress generated in the aging process, so that the accelerated aging phenomenon caused by local stress concentration is reduced. The polycaprolactone and the nano zinc oxide are added, so that a continuous interpenetrating network structure is formed by the polycaprolactone and the polylactic acid, the external stress is absorbed, the brittleness increase caused by ultraviolet aging is relieved, the whole thermal oxygen sensitivity of the system can be reduced, the oxidative degradation under the high-temperature and oxygen environment is inhibited, and the mechanical property of the paper-plastic composite woven bag is maintained. The nano zinc oxide has strong ultraviolet absorption and scattering capability, can form a uniform ultraviolet blocking network in the substrate, effectively blocks the direct irradiation and damage of ultraviolet rays to polylactic acid molecular chains, inhibits photoinitiated free radical chain reaction from the source, and reduces molecular chain fracture, embrittlement and strength attenuation. And the polycaprolactone can reduce the interfacial stress concentration possibly brought by the nano zinc oxide particles,