CN114790587B - Wire material of 3D printing polylactic acid/conductive filler electromagnetic shielding composite material, preparation method and application - Google Patents
Wire material of 3D printing polylactic acid/conductive filler electromagnetic shielding composite material, preparation method and application Download PDFInfo
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- CN114790587B CN114790587B CN202210526897.6A CN202210526897A CN114790587B CN 114790587 B CN114790587 B CN 114790587B CN 202210526897 A CN202210526897 A CN 202210526897A CN 114790587 B CN114790587 B CN 114790587B
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- 229920000747 poly(lactic acid) Polymers 0.000 title claims abstract description 121
- 239000004626 polylactic acid Substances 0.000 title claims abstract description 121
- 239000011231 conductive filler Substances 0.000 title claims abstract description 66
- 239000002131 composite material Substances 0.000 title claims abstract description 49
- 238000010146 3D printing Methods 0.000 title claims abstract description 32
- 239000000463 material Substances 0.000 title claims abstract description 20
- 238000002360 preparation method Methods 0.000 title abstract description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 47
- 239000002041 carbon nanotube Substances 0.000 claims abstract description 44
- 229910021393 carbon nanotube Inorganic materials 0.000 claims abstract description 44
- 230000020477 pH reduction Effects 0.000 claims abstract description 7
- 238000002156 mixing Methods 0.000 claims description 20
- 239000000203 mixture Substances 0.000 claims description 19
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 13
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 12
- 229910017604 nitric acid Inorganic materials 0.000 claims description 12
- 239000000843 powder Substances 0.000 claims description 12
- 238000002844 melting Methods 0.000 claims description 11
- 230000008018 melting Effects 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 10
- 238000001125 extrusion Methods 0.000 claims description 7
- 239000002253 acid Substances 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 5
- 239000000155 melt Substances 0.000 claims description 5
- 230000003213 activating effect Effects 0.000 claims description 3
- 239000012153 distilled water Substances 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 2
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- 241000282414 Homo sapiens Species 0.000 description 2
- JVTAAEKCZFNVCJ-REOHCLBHSA-N L-lactic acid Chemical compound C[C@H](O)C(O)=O JVTAAEKCZFNVCJ-REOHCLBHSA-N 0.000 description 2
- 238000001994 activation Methods 0.000 description 2
- 210000000988 bone and bone Anatomy 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 238000007639 printing Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000005411 Van der Waals force Methods 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229920002988 biodegradable polymer Polymers 0.000 description 1
- 239000004621 biodegradable polymer Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
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- 125000000524 functional group Chemical group 0.000 description 1
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Classifications
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
- D01F6/88—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polycondensation products as major constituent with other polymers or low-molecular-weight compounds
- D01F6/92—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polycondensation products as major constituent with other polymers or low-molecular-weight compounds of polyesters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y70/00—Materials specially adapted for additive manufacturing
- B33Y70/10—Composites of different types of material, e.g. mixtures of ceramics and polymers or mixtures of metals and biomaterials
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F1/00—General methods for the manufacture of artificial filaments or the like
- D01F1/02—Addition of substances to the spinning solution or to the melt
- D01F1/09—Addition of substances to the spinning solution or to the melt for making electroconductive or anti-static filaments
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
- H05K9/0083—Electromagnetic shielding materials, e.g. EMI, RFI shielding comprising electro-conductive non-fibrous particles embedded in an electrically insulating supporting structure, e.g. powder, flakes, whiskers
Abstract
The invention discloses a wire of a 3D printing polylactic acid/conductive filler electromagnetic shielding composite material, a preparation method and application thereof. The silk material is prepared from the following materials: 70-90 parts of polylactic acid, 10-30 parts of dextrorotation polylactic acid and 0.5-1 part of conductive filler subjected to acidification treatment. According to the wire disclosed by the invention, the polylactic acid stereocomplex crystal is formed in situ in the polylactic acid by adding the dextrorotation polylactic acid, and the uniform dispersion of the carbon nano tube in the polylactic acid is further controlled by utilizing the inherent strong interaction between the polylactic acid and the dextrorotation polylactic acid, so that the electromagnetic shielding performance of the composite material is ensured.
Description
Technical Field
The invention relates to the field of electromagnetic shielding composite materials, in particular to a wire material of a 3D printing polylactic acid/conductive filler electromagnetic shielding composite material, a preparation method and application.
Background
With the continuous development of technology, the life of human beings is more and more convenient, but the electromagnetic pollution is also serious. In most cases, the electromagnetic shielding material is mainly made of a metal material, and although the metal material is easy to recycle, the defects of high density, easy corrosion and the like are unfavorable for long-term use of the product. At present, a composite material process is adopted to blend conductive fillers such as metal and epoxy resin, and the strategy reduces the overall density of the electromagnetic shielding material, but the epoxy resin is difficult to recycle, so that certain influence is caused on the environment. Polylactic acid is an environment-friendly material, has excellent mechanical property and modulus, and is known as a biodegradable polymer with the most development prospect. Currently, polylactic acid has been widely used in medical engineering, often as surgical suture, bone nail, bone plate, etc. At present, the method for manufacturing the polylactic acid with electromagnetic shielding performance mainly comprises the step of blending and processing the polylactic acid and conductive materials such as metal or carbon into a composite material, so that the wave absorbing performance of the polylactic acid is improved. However, these methods do not systematically study the chemical and physical properties of the conductive filler and polylactic acid. At the same time, further machining is often required to make the final end product.
Disclosure of Invention
The invention aims to: in order to improve the electromagnetic shielding performance of polylactic acid and improve customized properties, the invention provides a wire of a 3D printing polylactic acid/conductive filler electromagnetic shielding composite material and a preparation method thereof. According to the invention, the activated conductive material and the dextrorotation polylactic acid are added to modify the material, so that the uniform dispersion and combination of the conductive filler in the polylactic acid are promoted, and the problem that the carbon nano tube cannot be uniformly dispersed in the polylactic acid in the prior art, so that a final finished product can show a high electromagnetic shielding value in a certain area, the electromagnetic shielding performance of other areas is poor, and the overall electromagnetic shielding performance of the material is poor is solved. The invention further provides 3D printing ink prepared from the modified polylactic acid/conductive filler wire, and a 3D printing technology is used for preparing a customized appearance product in one step.
The technical scheme is as follows: the 3D printing polylactic acid/conductive filler electromagnetic shielding composite material wire is prepared from the following materials in parts by weight: 70-90 parts of polylactic acid, 10-30 parts of dextrorotation polylactic acid and 0.5-1 part of conductive filler subjected to acidification treatment.
According to the wire of the 3D printing polylactic acid/conductive filler electromagnetic shielding composite material, the polylactic acid stereocomplex crystal is formed in situ in the polylactic acid by adding the dextrorotation polylactic acid, and the uniform dispersion of the carbon nano tube in the polylactic acid is further controlled by utilizing the inherent strong interaction between the polylactic acid and the dextrorotation polylactic acid, so that the electromagnetic shielding performance of the composite material is ensured.
The invention adopts the raw materials of the L-lactic acid which are cheap and simple in synthesis process, and the lactic acid produced by the degradation of the L-polylactic acid is harmless to human bodies. Compared with the L-polylactic acid, the D-polylactic acid has shorter monomer carbon length, so that the biodegradability of the D-polylactic acid is relatively reduced. In order to ensure excellent biodegradability, the addition amount of the dextrorotatory polylactic acid is 10-30 parts, and if the addition amount of the dextrorotatory polylactic acid is small, enough polylactic acid stereocomplex crystals cannot be formed in situ, and the dispersion of the carbon nano tubes cannot be effectively controlled, so that the electromagnetic shielding effect is poor. If excessive D-polylactic acid is added, the required melting temperature of the composite material is excessively increased, and the finished product after 3D printing is deformed due to thermal expansion, cold contraction and the like; and secondly, compared with the L-polylactic acid, the degradation speed of the L-polylactic acid is slower, and the ecological environment consumption is high. Experiments prove that the addition amount of the dextrorotatory polylactic acid is 20-30 parts as a preferable implementation mode.
As a preferred embodiment of the present invention, the conductive filler according to the present invention is a carbon nanotube.
The wire material of the electromagnetic shielding composite material is prepared by the following method: (1) preparing acidified carbon nanotubes; (2) Mixing the acidified carbon nano tube with polylactic acid, and forming a carbon nano tube conduction network in the material through melting of the polylactic acid and the acidified carbon nano tube to prepare a polylactic acid/carbon nano tube composite material; (3) And adding the dextrorotation polylactic acid to prepare the wire material of the 3D printing polylactic acid/carbon nano tube electromagnetic shielding composite material.
According to the invention, the surface of the carbon nano tube is subjected to oxidation modification by mixing sulfuric acid and nitric acid to obtain the carbon nano tube with carboxyl and hydroxyl on the surface, so that the acidified carbon nano tube can react with oxygen in the L-polylactic acid, and the bonding force between the carbon nano tube and the polylactic acid is enhanced. The large pi bond of the carbon nanotubes which are not acidified is not hydrophilic and not oleophilic, and the interaction of Van der Waals force among the carbon nanotubes, the ultrahigh surface energy and the high length-diameter ratio of the carbon nanotubes enable the carbon nanotubes to be easily agglomerated. Meanwhile, the carbon nano tube has smooth surface and no special functional group, so that the interface bonding force between the carbon nano tube and the polymer matrix is weak.
As a preferred embodiment of the present invention, the electromagnetic shielding composite material includes 80 parts of polylactic acid, 20 parts of dextrorotatory polylactic acid, and 0.5 part of an acidized conductive filler.
As a preferred embodiment of the present invention, the acidification treatment is: mixing mixed acid consisting of concentrated sulfuric acid and concentrated nitric acid with the mass ratio of 3:1-2 with conductive filler, and treating for 8-12 hours at the temperature of 35-40 ℃.
As a preferred embodiment of the invention, the mixed acid consists of concentrated sulfuric acid and concentrated nitric acid in a mass ratio of 3:1.
As a preferred embodiment of the present invention, the melt index of the polylactic acid is 2 to 10g/10min.
As a preferred embodiment of the present invention, the wire of the electromagnetic shielding composite is prepared by:
(1) Blending the conductive filler subjected to acidification treatment with polylactic acid to prepare polylactic acid/conductive filler blend, and melting and cooling the prepared polylactic acid/conductive filler blend to room temperature;
(2) And (3) adding the right-handed polylactic acid powder into the blend obtained in the step (1), and carrying out melt blending extrusion by using an extruder to obtain the polylactic acid/conductive filler composite material 3D printing wire.
As a preferred embodiment of the present invention, in the step (1) or the step (2), the blending time is 8 to 10 hours, and the melting temperature is 175 to 200 ℃.
The preparation method of the 3D printing polylactic acid/conductive filler electromagnetic shielding composite material comprises the following steps:
(S1): activating the surface of the conductive filler by adopting mixed acid to obtain an activated conductive filler;
(S2): washing the activated conductive filler prepared in the step (S1) with distilled water to remove impurities, and filtering to obtain activated conductive filler powder;
(S3): mixing polylactic acid powder with the activated conductive filler powder prepared in the step (S2) to prepare a polylactic acid/conductive filler blend;
(S4): and (3) melting the polylactic acid/conductive filler blend prepared in the step (S3), cooling to room temperature, adding the dextrorotation polylactic acid powder, and performing melt blending extrusion to obtain the polylactic acid/conductive filler composite material 3D printing wire.
Printing the 3D printing wire material obtained in the steps by using a 3D printer to obtain the 3D printing polylactic acid/conductive filler electromagnetic shielding composite material.
In a preferred embodiment of the present invention, in step (S1), the conductive filler is a carbon nanotube.
In a preferred embodiment of the present invention, in the step (S4), the mixing time is 8 to 10 hours, the melting temperature is 175 to 200 ℃, the melt blending speed is 30 to 120 rpm, and the extrusion temperature is 150 to 180 ℃.
The invention further provides application of the wire material of the 3D printing polylactic acid/conductive filler electromagnetic shielding composite material in 3D printing ink.
The beneficial effects are that: (1) The invention prepares the wire for the 3D printing polylactic acid/conductive filler electromagnetic shielding composite material, and solves the problem of poor electromagnetic shielding performance of the traditional polylactic acid material; (2) In the processing process of the wire, the conductive filler is preferentially distributed in the polylactic acid, a conductive path is formed inside the conductive filler, and then the dextrorotation polylactic acid is added, so that the polylactic acid stereocomplex crystal is formed in situ in the polylactic acid, the dispersion of the conductive filler in the polylactic acid is controlled, and the electromagnetic shielding performance of the composite material is ensured; (3) According to the invention, the polylactic acid/conductive filler is compounded to prepare the 3D printing wire, and the 3D printing technology is used for printing, so that the electromagnetic shielding performance is improved, and the customized attribute of the appearance is increased.
Drawings
FIG. 1 is a preparation step in embodiment 1;
fig. 2 shows the measurement results of the electromagnetic shielding performance of each electromagnetic shielding composite.
Detailed Description
The specific conditions are not noted in the examples of the present invention, and are carried out according to conventional conditions or conditions suggested by the manufacturer. The raw materials, reagents, etc. used, which are not noted to the manufacturer, are conventional products commercially available.
Polylactic acid (L-polylactic acid) and D-polylactic acid adopted in the following embodiments are purchased from Shenzhen Guanghua West company, inc., and the two polylactic acid brands are 8002D, and the melt index is 2-7 g/10min.
The carbon nanotubes are purchased from Jiangsu Xianfeng nano materials science and technology Co., ltdThe brand is XFS28, and the density is 1.2-1.5 g/cm 3 。
Embodiment case 1: preparation of 3D printing polylactic acid/conductive filler electromagnetic shielding composite material
The electromagnetic shielding composite material is prepared from the following raw materials in parts by weight: 0.5 part of carbon nano tube, 300 parts of mixture of concentrated sulfuric acid and concentrated nitric acid (the mass ratio of the concentrated sulfuric acid to the concentrated nitric acid is 3:1), 80 parts of polylactic acid and 20 parts of dextrorotation polylactic acid.
The specific implementation steps are as follows:
step 1: adding concentrated sulfuric acid and concentrated nitric acid mixture into the carbon nano tube to activate the carbon nano tube to prepare an acidified carbon nano tube for standby, wherein the weight part of the carbon nano tube is 0.5 part, the weight part of the concentrated sulfuric acid and concentrated nitric acid mixture is 300 parts (the mass ratio is 3:1), and the activation process temperature of the acidified carbon nano tube is 40 ℃ and the activation time is 12 hours;
step 2: washing the acidified carbon nanotube prepared in the step 1 with distilled water to remove impurities, and filtering to obtain acidified carbon nanotube powder;
step 3: melting the acidified carbon nanotube powder prepared in the step 2 with 90 parts of polylactic acid for 10 hours at 180 ℃, and cooling to room temperature to obtain a polylactic acid/carbon nanotube blend;
step 4: adding 20 parts of dextrorotation polylactic acid into the polylactic acid/carbon nano tube blend prepared in the step 3 at 180 ℃ to melt for 10 hours to obtain a polylactic acid/carbon nano tube composite material;
step 5: using an extruder to melt, blend and extrude the polylactic acid/carbon nano tube composite material prepared in the step 4, wherein the extrusion temperature is 180 ℃, and a 3D printing wire is obtained;
step 6: 3D printing is carried out on the wire material obtained in the step 5 by using a 3D printer, and a 3D printed polylactic acid/carbon nano tube electromagnetic shielding composite material is obtained;
step 7: the resulting material was tested for electromagnetic shielding according to GB/T12190-2021.
Embodiment case 2: preparation of 3D printing polylactic acid/conductive filler electromagnetic shielding composite material
The specific preparation method is as in embodiment 1; the weight part of the mixture of concentrated sulfuric acid and concentrated nitric acid in the step 1 of the embodiment 1 is changed to 350 parts, the mass ratio is changed to 3:2, and the rest steps are unchanged, so that the embodiment 2 is obtained.
Embodiment 3: preparation of 3D printing polylactic acid/conductive filler electromagnetic shielding composite material
Specific implementation is as in embodiment 1; the polylactic acid weight part in the step 3 is changed to 120 parts, and the rest steps are not changed to the embodiment 2.
Embodiment 4: preparation of 3D printing polylactic acid/conductive filler electromagnetic shielding composite material
Specific implementation is as in embodiment 1; step 4 was deleted without adding the right-handed polylactic acid, and the rest steps did not become embodiment 4.
Table 1 electromagnetic shielding property comparison results of electromagnetic shielding composite materials
| Performance of | Example 1 | Example 2 | Example 3 | Example 4 |
| Electromagnetic shielding performance (dB) | 36 | 30 | 28 | 25 |
As can be seen from table 1, in the embodiment 1 and the embodiment 2, as the weight parts and the mass ratio of the concentrated sulfuric acid and the concentrated nitric acid are increased, the electromagnetic shielding performance is reduced because the contents of the concentrated sulfuric acid and the concentrated nitric acid in the mixture are increased, and the oxidation degree of the carbon nanotubes is increased; as the weight fraction of polylactic acid increases in embodiment 1 and embodiment 3, the electromagnetic shielding performance decreases greatly, because the content of carbon nanotubes in the mixture decreases, the network formed by overlapping carbon nanotubes in the composite material becomes sparse, and the electromagnetic shielding effect deteriorates; as the content of the dextrorotatory polylactic acid in the embodiment 1 and the embodiment 4 is reduced to 0, the electromagnetic shielding performance becomes the weakest, because the polylactic acid stereocomplex crystal is not formed yet, the dispersion of the carbon nanotubes cannot be effectively controlled, so that the dispersion effect of the carbon nanotubes in the composite material is poor, and the electromagnetic shielding performance is reduced due to the generation of agglomeration. The 3D printing polylactic acid/carbon nano tube electromagnetic shielding composite material has excellent electromagnetic shielding performance.
The foregoing is only illustrative of the present invention, and the present invention is not limited to the above-described embodiments, but is capable of other modifications, adaptations, alternatives, combinations and simplifications without departing from the spirit and principles of the present invention.
Claims (9)
1. The wire of the 3D printing polylactic acid/conductive filler electromagnetic shielding composite material is characterized by being prepared from the following materials in parts by weight: 80 parts of polylactic acid, 20 parts of dextrorotation polylactic acid and 0.5 part of conductive filler subjected to acidification treatment; the acidification treatment is as follows: mixing a mixed acid consisting of concentrated sulfuric acid and concentrated nitric acid with the mass ratio of 3:1-2 with a conductive filler, and treating for 8-12 hours at the temperature of 35-40 ℃.
2. The wire of the 3D printed polylactic acid/conductive filler electromagnetic shielding composite material according to claim 1, wherein the melt index of the polylactic acid is 2-10 g/10min.
3. The wire of a 3D printed polylactic acid/conductive filler electromagnetic shielding composite material according to claim 1, wherein the wire is prepared by the following method:
(1) Blending the conductive filler subjected to acidification treatment with polylactic acid to prepare polylactic acid/conductive filler blend, and melting and cooling the prepared polylactic acid/conductive filler blend to room temperature;
(2) And (3) adding the right-handed polylactic acid powder into the blend obtained in the step (1), and carrying out melt blending extrusion to obtain the polylactic acid/conductive filler composite material 3D printing wire.
4. The wire of the 3D printed polylactic acid/conductive filler electromagnetic shielding composite material according to claim 3, wherein in the step (1) or the step (2), the blending time is 8-10 hours, and the melting temperature is 175-200 ℃.
5. A method for preparing the wire of the 3D printed polylactic acid/conductive filler electromagnetic shielding composite material as claimed in claim 1, comprising the following steps:
(S1): activating the surface of the conductive filler by adopting mixed acid to obtain an activated conductive filler;
(S2): washing the activated conductive filler prepared in the step (S1) with distilled water to remove impurities, and filtering to obtain activated conductive filler powder;
(S3): mixing polylactic acid powder with the activated conductive filler powder prepared in the step (S2) to prepare a polylactic acid/conductive filler blend;
(S4): and (3) melting the polylactic acid/conductive filler blend prepared in the step (S3), cooling to room temperature, adding the dextrorotation polylactic acid powder, and performing melt blending extrusion to obtain the polylactic acid/conductive filler composite material 3D printing wire.
6. The method for producing a wire of a 3D printed polylactic acid/conductive filler electromagnetic shielding composite material according to claim 5, wherein in step (S1), the conductive filler is a carbon nanotube.
7. The method for preparing a wire of a 3D printed polylactic acid/conductive filler electromagnetic shielding composite material according to claim 5, wherein the activating comprises the steps of: mixing a mixed acid consisting of concentrated sulfuric acid and concentrated nitric acid with the mass ratio of 3:1-2 with a conductive filler, and treating for 8-12 hours at the temperature of 35-40 ℃.
8. The method for preparing a wire of a 3D printed polylactic acid/conductive filler electromagnetic shielding composite material according to claim 5, wherein in the step (S4), the mixing time is 8-10 hours, the melting temperature is 175-200 ℃, the melt blending rotation speed is 30-120 rpm, and the extrusion temperature is 150-180 ℃.
9. Use of the wire of 3D printed polylactic acid/conductive filler electromagnetic shielding composite material of claim 1 in 3D printing ink.
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| CN202210526897.6A CN114790587B (en) | 2022-05-16 | 2022-05-16 | Wire material of 3D printing polylactic acid/conductive filler electromagnetic shielding composite material, preparation method and application |
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| CN202210526897.6A CN114790587B (en) | 2022-05-16 | 2022-05-16 | Wire material of 3D printing polylactic acid/conductive filler electromagnetic shielding composite material, preparation method and application |
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| CN101235193A (en) * | 2008-01-15 | 2008-08-06 | 北京科技大学 | Method for preparing degradable biocompatibility macromolecule/carbon nano-tube composite material |
| CN102675893A (en) * | 2012-06-04 | 2012-09-19 | 西南交通大学 | Method for preparing polymer-based conducting composite material by melt blending |
| CN102952383A (en) * | 2011-08-24 | 2013-03-06 | 中国石油化工股份有限公司 | Carbon nanotube/polylactic acid conductive composite material and preparation method |
| CN111391305A (en) * | 2020-02-26 | 2020-07-10 | 四川大学 | Preparation method of polymer-based 3D printing electromagnetic shielding product |
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