CN114381103A - Environment-friendly antibacterial foreign language translator material and preparation method thereof - Google Patents
Environment-friendly antibacterial foreign language translator material and preparation method thereof Download PDFInfo
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- CN114381103A CN114381103A CN202210133655.0A CN202210133655A CN114381103A CN 114381103 A CN114381103 A CN 114381103A CN 202210133655 A CN202210133655 A CN 202210133655A CN 114381103 A CN114381103 A CN 114381103A
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- 230000000844 anti-bacterial effect Effects 0.000 title claims abstract description 100
- 239000000463 material Substances 0.000 title claims abstract description 67
- 238000002360 preparation method Methods 0.000 title abstract description 9
- 229920000747 poly(lactic acid) Polymers 0.000 claims abstract description 48
- 239000004626 polylactic acid Substances 0.000 claims abstract description 48
- 229920001661 Chitosan Polymers 0.000 claims abstract description 36
- 238000002844 melting Methods 0.000 claims abstract description 36
- 230000008018 melting Effects 0.000 claims abstract description 36
- 239000002245 particle Substances 0.000 claims abstract description 34
- 238000000034 method Methods 0.000 claims abstract description 33
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- 239000000155 melt Substances 0.000 claims abstract description 29
- 238000000151 deposition Methods 0.000 claims abstract description 23
- 230000008569 process Effects 0.000 claims abstract description 23
- 239000000835 fiber Substances 0.000 claims abstract description 20
- 230000008021 deposition Effects 0.000 claims abstract description 19
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- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical compound [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000010438 heat treatment Methods 0.000 claims abstract description 13
- 238000010041 electrostatic spinning Methods 0.000 claims abstract description 12
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 44
- 239000001569 carbon dioxide Substances 0.000 claims description 22
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 22
- 239000011148 porous material Substances 0.000 claims description 13
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 4
- 239000001307 helium Substances 0.000 claims description 3
- 229910052734 helium Inorganic materials 0.000 claims description 3
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 3
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- 238000012360 testing method Methods 0.000 description 10
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- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/12—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
- C08J9/122—Hydrogen, oxygen, CO2, nitrogen or noble gases
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- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0061—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof characterized by the use of several polymeric components
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- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
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Abstract
The invention discloses an environment-friendly antibacterial foreign language translator material and a preparation method thereof. The preparation method comprises the following steps: mixing the chitosan solution with the silver nitrate solution, and obtaining the chitosan antibacterial fiber loaded with the nano Ag particles through visible light irradiation and electrostatic spinning processes; heating and melting polylactic acid to extrude a hollow polylactic acid wire; guiding the three-dimensional model of the foreign language translator into a fused deposition modeling device for layering and slicing; and (2) putting the chitosan antibacterial fiber into a hollow polylactic acid wire hole, heating and melting to form a melt, introducing critical inert gas, maintaining the pressure to dissolve the inert gas into the melt, forming a foreign language translator structure by melting and depositing the melt, and performing in-situ micropore foaming to form a micropore structure in the processes of cooling and solidification at room temperature and pressure release to obtain the chitosan antibacterial fiber. The invention realizes the preparation of the foreign language translator material with dual functions of environmental protection, degradability and long-acting antibiosis, and has wide application prospect.
Description
Technical Field
The invention relates to a functional environment-friendly material and a preparation method thereof, in particular to an environment-friendly antibacterial foreign language translator material and a preparation method thereof.
Background
The language is an important tool for expressing emotion and demand, and with the acceleration of the globalization process, the communication and communication demands among people in different countries are increased rapidly, but due to the difference of languages in different countries, the difficulty in mastering various languages by individuals is high, and the communication among people in different countries is limited. The foreign language translator can realize a translation tool for translating multiple languages, and the generation of the translation tool can solve the problems.
At present, most foreign language translator shells in the market are made of light non-degradable plastics such as ABS, PC and the like, and upgrading and elimination of the foreign language translator shells inevitably bring more environmental pollution, for example, the foreign language translator shells are buried in soil to influence crops to absorb nutrients and moisture, so that the yield of the crops is reduced, underground water sources are polluted, and harmful gas, polluted air and the like are generated by burning; on the other hand, because the foreign language translator is used in different public places for a long time, even if the foreign language translator is disinfected before being used every time, the foreign language translator cannot avoid adhesion and proliferation of bacteria and even can become a carrier for pathogen transmission, and the foreign language translator is required to be kept close to the nose and the mouth of a person in the using process, so that the health of the user is harmed.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide an environment-friendly antibacterial foreign language translator material with dual functions of environment protection, degradability and long-acting antibiosis;
the second purpose of the invention is to provide a preparation method of the environment-friendly antibacterial foreign language translator material.
The technical scheme is as follows: the environment-friendly antibacterial foreign language translator material comprises chitosan/polylactic acid with a microporous structure loaded with antibacterial nano Ag particles.
Wherein the nano Ag particles have the particle size of 3-10 nm and the content of 0.1-0.3 wt.%.
Wherein the pore diameter of the microporous structure is 10-80 μm.
The preparation method of the environment-friendly antibacterial foreign language translator material comprises the following steps:
(1) mixing chitosan solution with silver nitrate solution, and irradiating with visible light to promote Ag in spinning process+Reducing the nano Ag in situ to obtain the chitosan antibacterial fiber loaded with nano Ag particles;
(2) heating and melting biodegradable polylactic acid, and extruding a hollow polylactic acid wire;
(3) guiding the three-dimensional model of the foreign language translator into a fused deposition forming device, and slicing in layers;
(4) putting the chitosan antibacterial fiber loaded with the nano Ag particles into a hollow polylactic acid wire hole, heating and melting the chitosan antibacterial fiber in a melting deposition forming device to form a melt, introducing critical inert gas, maintaining the pressure to promote the inert gas to be dissolved in the melt, forming the foreign language translator structure by melting deposition of the melt, and performing in-situ micropore foaming to form a micropore structure in the processes of cooling solidification and pressure release to prepare the environment-friendly antibacterial foreign language translator material.
The environment-friendly antibacterial foreign language translator material is a microporous structure chitosan/polylactic acid antibacterial foreign language translator material loaded with antibacterial nano Ag particles.
Wherein, in the step (1), the silver nitrate solution is added into the chitosan solution and then stirred, the visible light irradiation is adopted to assist the electrostatic spinning process, and the visible light irradiation promotes Ag in the spinning process+In situ reduction to nanoAg; extruding the hollow polylactic acid wire material by an extrusion molding process in the step (2); and (4) heating the hollow polylactic acid wire material in a melting cavity of a fused deposition forming device until the hollow polylactic acid wire material is melted into a melt, introducing critical inert gas into the melting cavity, maintaining the pressure, promoting the inert gas to be dissolved in the melt, forming the foreign language translator structure by fused deposition, and performing in-situ micropore foaming to form a micropore structure in the processes of cooling solidification at room temperature and pressure release to obtain the environment-friendly antibacterial foreign language translator material.
Wherein, in the step (4), the critical inert gas is one or more of carbon dioxide, nitrogen, argon, helium and ethane.
In the step (4), the pressure of the melting cavity is maintained at 3-12 MPa for 5-20 s. Under the pressure and time, the critical inert gas is fully dissolved in the melt.
In the step (4), the concentration of the critical inert gas introduced into the melting cavity is 0.5-1.5 mol/L. At this concentration, the critical inert gas can be uniformly dissolved in the melt.
In the step (4), the volume ratio of the critical inert gas introduced into the melting cavity to the hollow polylactic acid wire is 1: 3-1: 10. At this ratio, the pore size of the micropores can be effectively controlled after the inert gas is released.
Wherein in the step (1), the voltage of the electrostatic spinning process is 15-18 kV.
In the step (1), chitosan is dissolved in a mixed aqueous solution of 3.5-4 wt.% of acetic acid and 0.5-1 wt.% of ethylenediamine, and the mixture is stirred to obtain a chitosan solution.
Wherein in the step (2), the spinning aperture of the hollow polylactic acid filament is 0.1-0.2 mm.
The invention principle is as follows: according to the requirements of environmental protection and antibacterial function of foreign language translator materials, based on the biodegradation characteristic of polylactic acid and the antibacterial function of Ag/chitosan, a visible light irradiation auxiliary electrostatic spinning process is designed, the irradiation of visible light in the electrostatic spinning process promotes the in-situ synthesis of nano Ag particles, and the chitosan antibacterial fiber loaded with nano Ag particles is obtained; the biodegradable polylactic acid is heated and melted and then extruded out of a hollow wire material, a critical inert gas-based auxiliary melting deposition process is designed, chitosan antibacterial fiber loaded with nano Ag particles is placed into the hollow polylactic acid wire material, the hollow polylactic acid wire material is melted into a melt by a melting deposition forming machine and then is pressurized, critical carbon dioxide is introduced to promote the critical inert gas to be dissolved into the melt, after the hollow polylactic acid wire material is formed by the melting deposition process, in-situ micropore foaming is carried out in the processes of room temperature cooling solidification and pressure release to form a micropore structure, the antibacterial nano Ag particles loaded in the micropore structure are continuously released, the lasting antibacterial function can be realized, and the polylactic acid is biodegradable and is convenient to recover and environment-friendly.
Has the advantages that: compared with the prior art, the invention has the following remarkable advantages:
(1) based on the electrostatic spinning principle and the illumination radiation reduction mechanism, the visible light radiation-assisted electrostatic spinning process is designed, namely, the silver nitrate-doped polylactic acid solution applies visible light radiation in the electrostatic spinning process to promote Ag+Is reduced into nano Ag particles and is loaded in the polylactic acid antibacterial fiber in situ, so that the interface bonding strength between the nano antibacterial particles and the polylactic acid fiber can be obviously enhanced, and the antibacterial long-acting property is favorably improved.
(2) Based on a fused deposition forming principle and the characteristics of critical inert gas, a critical inert gas-assisted fused deposition process is designed, chitosan antibacterial fiber/polylactic acid loaded with nano Ag particles is heated and melted into a melt by a fused deposition forming machine, pressure is maintained, the critical inert gas is introduced to promote the inert gas to be dissolved in the melt, and after the forming is carried out according to a foreign language translator model, in-situ foaming is induced in the processes of room temperature cooling solidification and pressure release to form micropores, so that the integrated manufacturing of a micropore structure/antibacterial function is realized.
(3) The chitosan/polylactic acid foreign language translator material with the microporous structure loaded with antibacterial nano Ag particles is newly designed for the requirements of environmental protection and antibacterial function of foreign language translator materials, and the antibacterial function and the recovery environmental protection effect of the chitosan/polylactic acid foreign language translator material are realized.
(4) According to the physical properties of carbon dioxide and other inert gases, the mixed gas of carbon dioxide and other inert gases is innovatively designed to be used as an auxiliary gas source so as to reduce the critical pressure, reduce the required critical pressure, effectively reduce the energy consumption, reduce the requirement on critical inert gas auxiliary fused deposition process equipment, and have good economic value.
(5) The size of micron pores is reasonably regulated and controlled by controlling the concentration of the inert gas, and the porosity is regulated and controlled by the volume ratio of the inert gas to the hollow polylactic acid wire material, so that the hollow polylactic acid wire material has the advantages of large volume ratio, large porosity and low density.
Drawings
Fig. 1 is a partial porous morphology diagram of the environmentally-friendly antibacterial foreign language translator material prepared in example 1.
Detailed Description
The present invention is described in further detail below.
Example 1
(1) Dissolving chitosan in a mixed aqueous solution of 4 wt.% acetic acid and 1 wt.% ethylenediamine, stirring, adding 0.2g/L diluted silver nitrate solution, stirring, and performing visible light irradiation assisted electrostatic spinning with spinning pore diameter of 0.1mm and voltage of 15kV to promote Ag in the spinning process+Reducing the nano Ag in situ to obtain the chitosan antibacterial fiber loaded with nano Ag particles;
(2) heating the biodegradable polylactic acid to 180 ℃ for melting, and extruding a hollow wire material by an extrusion molding process;
(3) introducing the three-dimensional model of the foreign language translator into a fused deposition forming machine, and carrying out layered slicing treatment;
(4) putting the chitosan antibacterial fiber loaded with the nano Ag particles in the step (1) into the holes of the hollow polylactic acid wire in the step (2), feeding the wire material into a melting cavity through a wire feeding device of a fused deposition forming machine, heating the wire material until the wire material is completely melted into a melt, setting the pressure in the melting cavity to be 3MPa, introducing 0.5mol/L critical carbon dioxide gas, and the volume ratio of the gas to the hollow polylactic acid wire is 1:3, and the melt is subjected to pressure maintaining for 5s to promote the carbon dioxide to be dissolved in the melt, then the melt is melted and deposited layer by track through an extrusion head of a melting and depositing forming machine to form a foreign language translator structure, and carrying out in-situ micropore foaming to form a micropore structure in the processes of cooling solidification at room temperature and pressure release to obtain the chitosan/polylactic acid material foreign language translator with the micropore structure loaded with the antibacterial nano Ag particles.
Fig. 1 is a pore morphology diagram of the material for the environmentally-friendly antibacterial foreign language translator prepared in example 1, and it can be found that the size of pores is in the micrometer/nanometer dual-scale range, the specific surface area is large, the action area of antibacterial particles is favorably enhanced, and the pores are in a nearly circular shape.
The in vitro antibacterial performance test is carried out on the environment-friendly antibacterial foreign language translator material formed in the embodiment, staphylococcus aureus is selected as a test object, the antibacterial performance of the foreign language translator material is detected according to QB/T2591-2003 'antibacterial plastic-antibacterial performance test method and antibacterial effect', the result shows that after the test is carried out for 24 hours, the antibacterial rate of the environment-friendly antibacterial foreign language translator material to staphylococcus aureus reaches 99.9%, the antibacterial rate after the test is carried out for 72 hours still reaches 99.8%, and the environment-friendly antibacterial foreign language translator material has good lasting antibacterial performance.
Example 2
(1) Dissolving chitosan in a mixed aqueous solution of 3.5 wt.% acetic acid and 0.5 wt.% ethylenediamine, stirring, adding 0.8g/L dilute silver nitrate solution, stirring, and performing visible light irradiation assisted electrostatic spinning with spinning pore diameter of 0.2mm and voltage of 16kV to promote Ag in the spinning process+Reducing the nano Ag in situ to obtain the chitosan antibacterial fiber loaded with nano Ag particles;
(2) heating the biodegradable polylactic acid to 180 ℃ for melting, and extruding a hollow wire material by an extrusion molding process;
(3) introducing the three-dimensional model of the foreign language translator into a fused deposition forming machine, and carrying out layered slicing treatment;
(4) putting the chitosan antibacterial fiber loaded with the nano Ag particles in the step (1) into the holes of the hollow polylactic acid wire in the step (2), feeding the wire material into a melting cavity through a wire feeding device of a fused deposition forming machine, heating the wire material until the wire material is completely melted into a melt, setting the pressure in the melting cavity to be 10MPa, introducing 1.0mol/L of mixed inert gas of critical carbon dioxide and argon, and the volume ratio of the gas to the hollow polylactic acid wire is 1:5, and the melt is subjected to pressure maintaining for 5s to promote the carbon dioxide to be dissolved in the melt, then the melt is melted and deposited layer by track through an extrusion head of a melting and depositing forming machine to form a foreign language translator structure, and carrying out in-situ micropore foaming to form a micropore structure in the processes of cooling solidification at room temperature and pressure release to obtain the chitosan/polylactic acid material foreign language translator with the micropore structure loaded with the antibacterial nano Ag particles.
The in vitro antibacterial performance test is carried out on the environment-friendly antibacterial foreign language translator material formed in the embodiment, staphylococcus aureus is selected as a test object, the antibacterial performance of the foreign language translator material is detected according to QB/T2591-2003 'antibacterial plastic-antibacterial performance test method and antibacterial effect', the result shows that after the test is carried out for 24 hours, the antibacterial rate of the environment-friendly antibacterial foreign language translator material to staphylococcus aureus reaches 99.98%, the antibacterial rate after the test is carried out for 72 hours still reaches 99.9%, and the environment-friendly antibacterial foreign language translator material has good lasting antibacterial performance.
Example 3
(1) Dissolving chitosan in a mixed aqueous solution of 3.5 wt.% acetic acid and 0.5 wt.% ethylenediamine, stirring, adding 0.8g/L dilute silver nitrate solution, stirring, and performing visible light irradiation assisted electrostatic spinning with spinning pore diameter of 0.2mm and voltage of 18kV to promote Ag in the spinning process+Reducing the nano Ag in situ to obtain the chitosan antibacterial fiber loaded with nano Ag particles;
(2) heating biodegradable polylactic acid to 190 ℃ for melting, and extruding a hollow wire material by an extrusion molding process;
(3) introducing the three-dimensional model of the foreign language translator into a fused deposition forming machine, and carrying out layered slicing treatment;
(4) putting the chitosan antibacterial fiber loaded with the nano Ag particles in the step (1) into the hollow polylactic acid wire hole in the step (2), feeding the wire into a melting cavity through a wire feeding device of a fused deposition forming machine, heating until the wire is completely melted into a melt, setting the pressure in the melting cavity to be 12MPa, introducing 1.5mol/L of inert gas mixed with critical carbon dioxide and helium, wherein the volume ratio of the gas to the hollow polylactic acid wire is 1:10, then gradually melting and depositing the melt layer by layer through an extrusion head of the fused deposition forming machine to form a foreign language translator structure, and carrying out in-situ micropore foaming to form a micropore structure in the processes of room temperature cooling solidification and pressure release to obtain the chitosan/polylactic acid material translator with the micropore structure loaded with the antibacterial nano Ag particles.
The in vitro antibacterial performance test is carried out on the environment-friendly antibacterial foreign language translator material formed in the embodiment, staphylococcus aureus is selected as a test object, the antibacterial performance of the foreign language translator material is detected according to QB/T2591-2003 'antibacterial plastic-antibacterial performance test method and antibacterial effect', the result shows that after the test is carried out for 24 hours, the antibacterial rate of the environment-friendly antibacterial foreign language translator material to staphylococcus aureus reaches 99.99%, and the antibacterial rate after the test is carried out for 72 hours still reaches 99.8%, so that the environment-friendly antibacterial foreign language translator material has good lasting antibacterial performance.
Example 4
The basic procedure was the same as in example 1, except that in the step (4), 0.8mol/L of critical carbon dioxide gas was introduced.
In example 4, the critical inert carbon dioxide gas has a high concentration and a high dispersion degree, the size of generated micropores is small, the action area of the antibacterial Ag particles is increased, and the bacteriostasis rate is increased to 99.95%.
Example 5
The basic procedure was the same as in example 1, except that in the step (4), the ratio of the volume of the critical carbon dioxide introduced into the melting chamber to the volume of the hollow polylactic acid wire was 1: 8.
In example 5, the ratio of the volume of carbon dioxide to the volume of the hollow polylactic acid wire material is increased, so that the porosity is increased, the content of the antibacterial Ag particles is reduced, and the antibacterial rate is slightly reduced to 99.91 percent.
Example 6
The basic procedure was the same as in example 1, except that in the step (4), 0.5mol/L of a mixed inert gas of critical carbon dioxide and argon was introduced.
In the embodiment 6, the critical carbon dioxide and the argon are used as the mixed inert gas, the pressure is reduced to 1.1MPa, the energy consumption is effectively reduced, and the service life of the equipment is prolonged.
Comparative example 1
The basic procedure was the same as in example 1, except that in step (4), the pressure of the melt chamber was maintained at 2MPa for 2 s.
Comparative example 2
The basic procedure was as in example 1, except that in the step (4), the critical inert carbon dioxide gas was introduced at a concentration of 0.1 mol/L.
Comparative example 3
The basic procedure was the same as in example 1, except that in the step (4), the ratio of the volume of the critical carbon dioxide introduced into the melting chamber to the volume of the hollow polylactic acid wire was 1: 2.
The in-vitro antibacterial performance test of the environment-friendly antibacterial foreign language translator material formed in the comparative examples 1-3 shows that the antibacterial rate of the environment-friendly antibacterial foreign language translator material to staphylococcus aureus is lower than 99% after the test is carried out for 24 hours. The pressure in the comparative example 1 is low, the inert carbon dioxide gas is difficult to reach a critical state, so that the inert carbon dioxide gas is difficult to dissolve in the melt, a microporous structure cannot be generated, the action area of the antibacterial Ag particles is reduced, and the bacteriostasis rate is reduced; in the comparative example 2, the concentration of the critical inert carbon dioxide gas is too low, and most of generated micropores are closed pores, so that the action area of the antibacterial Ag particles is sharply reduced, and the bacteriostasis rate is reduced; in comparative example 3, the volume ratio of the critical carbon dioxide is large, so that the pore size is increased, the mechanical strength is low, and the requirement on the use mechanical property is difficult to meet.
Claims (10)
1. An environment-friendly antibacterial foreign language translator material is characterized by comprising chitosan/polylactic acid with a microporous structure loaded with antibacterial nano Ag particles.
2. The environmentally friendly antibacterial foreign language translator material of claim 1, wherein the nano Ag particles have a particle size of 3 to 10nm and a content of 0.1 to 0.3 wt.%.
3. The environmentally friendly antibacterial foreign language translator material of claim 1, wherein the pore size of the microporous structure is 10 to 80 μm.
4. The method for preparing the environmentally friendly antibacterial foreign language translator material of claim 1, comprising the steps of:
(1) mixing chitosan solution with silver nitrate solution, and irradiating with visible light to promote Ag in spinning process+Reducing the nano Ag in situ to obtain the chitosan antibacterial fiber loaded with nano Ag particles;
(2) heating and melting biodegradable polylactic acid, and extruding a hollow polylactic acid wire;
(3) guiding the three-dimensional model of the foreign language translator into a fused deposition forming device, and slicing in layers;
(4) putting the chitosan antibacterial fiber loaded with the nano Ag particles into a hollow polylactic acid wire hole, heating and melting the chitosan antibacterial fiber in a melting deposition forming device to form a melt, introducing critical inert gas, maintaining the pressure to promote the inert gas to be dissolved in the melt, forming the foreign language translator structure by melting deposition of the melt, and performing in-situ micropore foaming to form a micropore structure in the processes of cooling solidification and pressure release to prepare the environment-friendly antibacterial foreign language translator material.
5. The method for manufacturing environmentally friendly antibacterial foreign language translator material according to claim 4, wherein in the step (4), the pressure of the melting chamber is maintained at 3 to 12MPa for 5 to 20 s.
6. The method for preparing environmentally friendly antibacterial foreign language translator material according to claim 4, wherein the critical inert gas in step (4) is at least one of carbon dioxide, nitrogen, argon, helium, and ethane.
7. The method for preparing environment-friendly antibacterial foreign language translator material according to claim 4, wherein in the step (4), the concentration of the critical inert gas introduced into the melting chamber is 0.5-1.5 mol/L.
8. The method for preparing environment-friendly antibacterial foreign language translator material according to claim 4, wherein in the step (4), the ratio of the volume of the critical inert gas introduced into the melting cavity to the volume of the hollow polylactic acid wire is 1: 3-1: 10.
9. The method for preparing environment-friendly antibacterial foreign language translator material according to claim 4, wherein in the step (1), the voltage of the electrostatic spinning process is 15-18 kV.
10. The method for preparing environment-friendly antibacterial foreign language translator material according to claim 4, wherein in the step (2), the spinning pore diameter of the hollow polylactic acid filament is 0.1-0.2 mm.
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