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CN-118544435-B - Bamboo fiber, preparation method thereof and bamboo fiber winding hydrogen storage tank

CN118544435BCN 118544435 BCN118544435 BCN 118544435BCN-118544435-B

Abstract

The invention discloses a bamboo fiber, a preparation method thereof and a bamboo fiber winding hydrogen storage tank, wherein the preparation method comprises the steps of cutting natural bamboo into equal-length bamboo rods, immersing in boiling water for pretreatment, removing water-soluble organic matters, mixing hydrogen peroxide, organic acid and H 2 SO 4 in proportion to prepare a peroxy acid solution, wherein the concentration of the hydrogen peroxide is 7-24wt%, the concentration of the organic acid is 15-55wt%, the concentration of the H 2 SO 4 is 0.5-3wt%, immersing the pretreated bamboo rods in the peroxy acid solution at 50-60 ℃ for 12-20H to obtain bamboo fibers, immersing the bamboo fibers in an alkaline solution for neutralization, washing, vacuum drying the washed bamboo fibers, twisting and extending the length of the bamboo fibers to obtain long fibers, and applying microwave irradiation to the long fibers.

Inventors

  • CHENG XINGXING
  • LI XIANGDONG
  • CHENG SHENGMING
  • LI XUEFANG
  • WANG ZHIQIANG
  • TIAN LUNING

Assignees

  • 山东大学

Dates

Publication Date
20260505
Application Date
20240517

Claims (13)

  1. 1. A preparation method of bamboo fiber is characterized by comprising the following steps: Cutting natural bamboo into equal length bamboo poles, soaking in boiling water for pretreatment, and removing water-soluble organic matters; Mixing hydrogen peroxide, organic acid and H 2 SO 4 in proportion to prepare a peroxy acid solution, wherein the concentration of the hydrogen peroxide in the peroxy acid solution is 7-24wt%, the concentration of the organic acid is 15-55wt% and the concentration of H 2 SO 4 is 0.5-3wt%; soaking the pretreated bamboo poles in a peroxy acid solution at 50-60 ℃ for 12-20 hours to obtain bamboo fibers; then soaking the bamboo fibers in an alkali solution for neutralization, and washing after the neutralization is finished; Vacuum drying the washed bamboo fibers, wherein the vacuum degree is-0.06 to-0.1 MPa, twisting and prolonging the length of the bamboo fibers to obtain long fibers, the number of each bundle of bamboo fibers is 30-60, the twisting direction is S twisting, and the twist is 30-70 twisting/10 cm; Applying microwave irradiation to the long fiber, wherein the power of the microwave irradiation is 100-240W, the time of the microwave irradiation is 30-60min, and in the microwave irradiation process, the drawing force is applied to the two ends of the long fiber, and the drawing multiple is 4-7 times, so that the fiber is obtained; The bamboo fiber obtained by the preparation method is used for preparing the bamboo fiber winding hydrogen storage tank.
  2. 2. The method for preparing bamboo fiber according to claim 1, wherein the time for immersing the bamboo poles in boiling water is 1-2 hours.
  3. 3. The method of claim 1, wherein the organic acid is formic acid, acetic acid, oxalic acid, citric acid, malic acid or maleic acid.
  4. 4. The method of claim 1, wherein the alkali solution is NaOH solution, KOH solution, na 2 CO 3 solution, naHCO 3 solution or ammonia water.
  5. 5. The method of producing bamboo fiber according to claim 4, wherein the concentration of NaOH solution is 0.5-3wt%.
  6. 6. The method of claim 1, wherein the drying time is 24-48 hours.
  7. 7. A bamboo fiber characterized by being prepared by the preparation method of any one of claims 1-6.
  8. 8. A bamboo fiber winding hydrogen storage tank is characterized in that an inner container, a bamboo fiber winding layer and an outer protective layer are sequentially arranged from inside to outside, and the bamboo fiber winding layer is made of the composite material of the bamboo fibers and the epoxy resin according to claim 7.
  9. 9. The bamboo fiber winding hydrogen storage tank of claim 8, wherein the liner is made of high-density polyethylene, polyamide, polyethylene terephthalate or polyether-based material.
  10. 10. The bamboo fiber winding hydrogen storage tank of claim 8, wherein the thickness of the inner container is 2-4mm.
  11. 11. The bamboo fiber wound hydrogen tank of claim 8 wherein the thickness of the bamboo fiber wound layer is 20-30mm.
  12. 12. The bamboo fiber winding hydrogen storage tank of claim 8, wherein the outer protective layer is a glass fiber reinforced epoxy resin composite material.
  13. 13. The bamboo fiber wrapped hydrogen storage tank of claim 12, wherein the glass fibers are S-type glass fibers or E-type glass fibers.

Description

Bamboo fiber, preparation method thereof and bamboo fiber winding hydrogen storage tank Technical Field The invention belongs to the technical field of pressure vessels, and particularly relates to a bamboo fiber, a preparation method thereof and a bamboo fiber winding hydrogen storage tank. Background The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art. The high-pressure gaseous hydrogen storage has the advantages of simple equipment structure, low compression and maintenance energy consumption, high hydrogen filling and discharging efficiency, good adaptability to a wide temperature range and the like, and becomes the most common and mature hydrogen storage technology at present. The hydrogen storage tanks are required to have high safety properties of high strength, high modulus, fatigue resistance, light weight, explosion resistance, crush resistance, and impact resistance. The current IV-type hydrogen storage tank is generally divided into an inner gas barrier layer, a middle pressure-resistant layer and an outer protective layer. Among them, the middle pressure-resistant layer is thickest, and is usually made of an epoxy resin composite material wound by carbon fibers. The graphitized structure of the carbon fiber which is uniformly arranged in the axial direction and is highly crystallized is enough to bear all performances of the fiber wound outside the hydrogen storage bottle, but the raw material for preparing the carbon fiber is obtained from a petroleum cracking process through a precursor preparation process with complex processes such as early monomer purification, polymerization, spinning, drafting and the like and a subsequent high-energy consumption process such as preoxidation, carbonization, graphitization and the like, and the resource utilization rate of the whole process is low and the environmental hazard is large. The Chinese bamboo has rich resources and the bamboo has a fast growth cycle. The whole process from growing to becoming bamboo products has high-efficiency carbon fixing capability. The natural bamboo fiber always keeps axial growth and has the characteristics of higher tensile strength and higher elastic modulus. At present, the bamboo fiber is usually obtained by a method combining mechanical and physical filament separation, chemical or biochemical degumming, opening and carding, the technological process is long and complex, and the finished fiber obtained by the method can partially retain the partial structure of the natural bamboo fiber, but the tensile strength and the elastic modulus are greatly reduced, so that the mechanical property requirement of the hydrogen storage bottle on the externally wound fiber is difficult to be achieved. The chemical method generally hydrolyzes bamboo chips into pulp, and then the pulp fiber of regenerated cellulose is obtained through spinning, and the hydrolysis and re-spinning process recast the bamboo cellulose structure, so that the excellent mechanical properties of the natural bamboo fiber are difficult to inherit. Disclosure of Invention Aiming at the defects existing in the prior art, the invention aims to provide a bamboo fiber, a preparation method thereof and a bamboo fiber winding hydrogen storage tank. In order to achieve the above object, the present invention is realized by the following technical scheme: in a first aspect, the present invention provides a method for preparing bamboo fibers, comprising the steps of: Cutting natural bamboo into equal length bamboo poles, soaking in boiling water for pretreatment, and removing water-soluble organic matters; Mixing hydrogen peroxide, organic acid and H 2SO4 in proportion to prepare a peroxy acid solution, wherein the concentration of the hydrogen peroxide in the peroxy acid solution is 7-24wt%, the concentration of the organic acid is 15-55wt% and the concentration of H 2SO4 is 0.5-3wt%; soaking the pretreated bamboo poles in a peroxy acid solution at 50-60 ℃ for 12-20 hours to obtain bamboo fibers; then soaking the bamboo fibers in an alkali solution for neutralization, and washing after the neutralization is finished; vacuum drying the washed bamboo fiber, and twisting to prolong the length of the bamboo fiber to obtain long fiber; and (5) applying microwave irradiation to the long fibers to obtain the fiber. The chemical composition of the bamboo stems comprises a large amount of cellulose, hemicellulose and lignin, and also comprises about 30 percent by mass of soluble pentosan and a small amount of other soluble organic matters, wherein the soluble organic matters are easy to react with hydrogen peroxide, organic acid and the like to influence the cellulose extraction process. In addition, the bamboo material without removing the soluble organic matters has compact structure, and the reaction efficiency in the processes of removing lignin and extracting cellulose can be reduced.