CN111923404A - Plastic powder 3D printing interface enhancing method - Google Patents
Plastic powder 3D printing interface enhancing method Download PDFInfo
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- CN111923404A CN111923404A CN202010168436.7A CN202010168436A CN111923404A CN 111923404 A CN111923404 A CN 111923404A CN 202010168436 A CN202010168436 A CN 202010168436A CN 111923404 A CN111923404 A CN 111923404A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/10—Processes of additive manufacturing
- B29C64/141—Processes of additive manufacturing using only solid materials
- B29C64/153—Processes of additive manufacturing using only solid materials using layers of powder being selectively joined, e.g. by selective laser sintering or melting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/20—Apparatus for additive manufacturing; Details thereof or accessories therefor
- B29C64/255—Enclosures for the building material, e.g. powder containers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/30—Auxiliary operations or equipment
- B29C64/307—Handling of material to be used in additive manufacturing
- B29C64/314—Preparation
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- 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
- B33Y10/00—Processes of additive manufacturing
-
- 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
- B33Y30/00—Apparatus for additive manufacturing; Details thereof or accessories therefor
-
- 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
- B33Y40/00—Auxiliary operations or equipment, e.g. for material handling
-
- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
- B29K2105/12—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of short lengths, e.g. chopped filaments, staple fibres or bristles
- B29K2105/14—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of short lengths, e.g. chopped filaments, staple fibres or bristles oriented
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mechanical Engineering (AREA)
Abstract
The invention discloses a plastic powder 3D printing interface enhancing method, which comprises the steps of firstly magnetizing carbon nano tubes or short carbon fibers; then adding the magnetized carbon nano tube or short carbon fiber material into 3D printed plastic powder, uniformly mixing, adding the mixed 3D printing powder into a 3D printing powder box, adding a magnetic field on the 3D printing powder box, and finally starting printing to obtain an interface-enhanced 3D printing part; according to the invention, a pair of magnetic fields is added on the upper part and the lower part of the 3D printing powder box, a part of magnetized carbon nano tube or short carbon nano fiber whisker is exposed on the surface of a solidified plastic layer, when the plastic powder is heated, solidified and contracted, the connection of the whisker-shaped carbon material between the two layers is realized when the latter layer of plastic powder is solidified, and as the carbon fiber material has high strength and penetrates through the solidified interfaces of the two layers of plastic powder, the 3D printing interface is effectively enhanced, the 3D printing process is not required to be changed, the use method is simple, and the strength of a 3D printing part is improved.
Description
Technical Field
The invention belongs to the technical field of 3D printing, and relates to a plastic powder 3D printing interface enhancing method.
Background
The plastic powder 3D printing is a common 3D printing technology, and powder uniformly distributed in a printer is thickened layer by means of multiple times of heating, so that additive manufacturing is achieved; the method has the advantages that only useful powder of the part is heated and solidified through the selected areas, the powder outside the printed part model is not heated, although the selected areas can be different each time, the solidified powder of the next layer is bound on the interface of the previous layer, and the next layer is connected with the solidified powder of the previous layer to realize thickening, the manufacturing method does not waste raw materials, does not need to process the part after, but has the defects of poor interlayer combination and low strength of the product.
Disclosure of Invention
The invention aims to provide a plastic powder 3D printing interface enhancing method, which solves the problem of low strength of the existing plastic powder 3D printing interface.
The invention adopts the technical scheme that a plastic powder 3D printing interface enhancing method is implemented according to the following steps:
step 1, magnetizing carbon nano tubes or short carbon fibers;
step 2, adding the magnetized carbon nano tube or short carbon fiber material obtained in the step 1 into 3D printed plastic powder, and uniformly mixing to obtain 3D printed powder;
and 3, adding the 3D printing powder mixed in the step 2 into a 3D printing powder box, then adding a magnetic field on the 3D printing powder box, and finally starting printing to obtain the interface-enhanced 3D printing part.
The invention is also characterized in that:
wherein the length of the carbon nano tube or the short carbon fiber in the step 1 is not more than 0.1mm, and the diameter is not more than 0.1 μm;
wherein the magnetization process in the step 1 is as follows: mixing the carbon nano tube or the short carbon fiber with iron ions, then adding ammonia water for reaction, filtering the carbon nano tube or the short carbon fiber, and finally drying, grinding and dispersing the filtered carbon nano tube or the short carbon fiber to obtain a magnetized carbon nano tube or short carbon fiber material;
wherein the mixing ratio of the carbon nano tubes or the short carbon fibers to the iron ions is 4-5: 1;
wherein the iron ions are prepared into 0.2-0.3 wt% solution before mixing;
wherein the iron ions comprise Fe+3And Fe+2，Fe+3And Fe+2In a ratio of 4: 7;
mixing the carbon nano tubes or the short carbon fibers with iron ions in the step 1, stirring at room temperature for 1-2 hours, adding 10-20 wt% of ammonia water, stirring for 0.5-1 hour, and filtering;
wherein the temperature in the drying process is 90-95 ℃, and the drying time is 7-12 h;
in the step 2, the magnetized carbon nano tube or short carbon fiber material is mixed with 3-6 wt% of 3D printed plastic powder, the 3D printed plastic powder is thermosetting type and thermoplastic type 3D printed plastic powder, and then ball milling and mixing are carried out;
and in the step 3, magnetic fields of 0.2-0.5T are connected to the 3D printing powder box from top to bottom.
The invention has the beneficial effects that:
the magnetized carbon nano tubes or short carbon fiber materials are uniformly dispersed in the 3D printing powder, the magnetized carbon nano tubes or short carbon fiber materials have a certain length and are in a short whisker shape and can stand up in a magnetic field, the carbon nano tubes or short carbon fibers can be exposed on the surface of a cured layer when the plastic powder is cured and shrunk, the exposed carbon nano tubes or short carbon fibers can extend into a second layer when the second layer of powder is cured, the carbon nano tubes or short carbon fibers can pull two interfaces together to achieve the effect of interface enhancement, only a pair of magnetic fields of 0.2-0.5T is added to a 3D printing powder box, the 3D printing process does not need to be changed, and the method is simple.
Drawings
FIG. 1 is a TEM image of a single layer containing short carbon fibers prepared in a 3D printing interface enhancement method of plastic powder according to the present invention;
FIG. 2 is a TEM cross-section of a multi-layer carbon nanotube prepared in the 3D printing interface enhancement method for plastic powder according to the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention provides a plastic powder 3D printing interface enhancing method which is implemented by the following steps:
step 1, mixing carbon nano tubes or short carbon fibers (the length is within 0.1mm, and the diameter is less than 0.1 mu m) and iron ions according to the weight ratio of 4-5: 1 proportion, the iron ion is Fe+3：Fe+2The material is a mixture of 4:7, iron ions are firstly mixed into 0.2-0.3 wt% of solution, then carbon nano tubes or short carbon fibers are added and stirred, the mixture is stirred for 1-2 hours at room temperature, then 10-20 wt% of ammonia water is dripped, the mixture is stirred for 0.5-1 hour, the carbon nano tubes or the short carbon fibers are filtered, a filtered filter cake is dried for 7-12 hours at the temperature of 95-90 ℃, and finally the dried carbon nano tubes or the short carbon fibers are ground and dispersed to obtain the magnetized carbon nano tubes or the short carbon fibers.
And 2, mixing the magnetized carbon nano tube or short carbon fiber material with 3-6 wt% of plastic powder printed by 3D printing, and mixing the magnetized carbon nano tube or short carbon fiber material and the plastic powder uniformly by ball milling.
And 3, connecting a 0.2-0.5T magnetic field to the upper part and the lower part of the conventional 3D printing powder box, and performing 3D printing according to a normal 3D printing process to obtain the interface-enhanced 3D printing part.
The invention carries out iron ion treatment on the surface of the carbon nano tube or the short carbon nano fiber, adds magnetic fields above and below a 3D printing powder box, leads the magnetized carbon nano tube or the short carbon nano fiber to be erected in fields, when the plastic powder is heated and cured to shrink, the carbon material does not shrink, and the partially magnetized carbon nano-tube or short carbon nano-fiber whisker is exposed on the surface of the cured plastic layer, when the plastic powder is covered by the latter layer, the whisker-like carbon material exposed on the surface can extend into the plastic powder, when the latter plastic powder is solidified, the next layer of whisker-shaped carbon material exposed on the surface is solidified on the upper plastic layer to realize the connection of the whisker-shaped carbon material between the two layers, because the carbon fiber material has high strength and penetrates through the interface of two layers of plastic powder solidification, the 3D printing interface is effectively enhanced, and the strength of the 3D printing part is improved.
Example 1
Step 1, mixing the carbon nano tube with iron ions according to a ratio of 4:1, wherein the iron ions are Fe+3：Fe+2Is 4:7, preparing iron ions into a 0.2 wt% solution, adding carbon nano tubes, stirring at room temperature for 1h, then dropwise adding 10 wt% ammonia water, stirring for 0.5h, filtering out the carbon nano tubes, drying a filtered filter cake at 95 ℃ for 7h, and finally grinding and dispersing the dried carbon nano tubes to obtain magnetized carbon nano tubes;
step 2, adding the magnetized carbon nanotubes into 3 wt% of plastic powder for 3D printing, and mixing the magnetized carbon nanotubes and the plastic powder uniformly by ball milling;
and 3, connecting a 0.2T magnetic field to the upper part and the lower part of the conventional 3D printing powder box, and performing 3D printing according to a normal 3D printing process to obtain the 3D printing part with the enhanced interface.
Example 2
Step 1, mixing short carbon fiber (length within 0.1mm, diameter less than 0.1 μm) with iron ions according to a ratio of 4.5: 1 proportion, the iron ion is Fe+3：Fe+2Is 4:7, preparing iron ions into a 0.25 wt% solution, adding short carbon fibers, stirring at room temperature for 1.5h, then dropwise adding 15 wt% ammonia water, stirring for 0.6h, filtering out the short carbon fibers, drying a filtered filter cake at 92 ℃ for 9h, and finally grinding and dispersing the dried short carbon fibers to obtain a magnetized short carbon fiber material;
step 2, adding the magnetized short carbon fibers into the 3D printed plastic powder in a proportion of 4 wt%, and mixing the magnetized short carbon fibers and the plastic powder uniformly by adopting ball milling;
and 3, connecting a 0.4T magnetic field to the upper part and the lower part of the conventional 3D printing powder box, and performing 3D printing according to a normal 3D printing process to obtain the 3D printing part with the enhanced interface.
Example 3
Step 1, mixing short carbon fiber (length within 0.1mm, diameter less than 0.1 μm) and iron ions according to the weight ratio of 5:1 proportion, the iron ion is Fe+3：Fe+2Is 4:7, preparing iron ions into a 0.3 wt% solution, adding short carbon fibers, stirring at room temperature for 2 hours, then dropwise adding 20 wt% ammonia water, stirring for 1 hour, filtering out the short carbon fibers, drying a filtered filter cake at 90 ℃ for 12 hours, and finally grinding and dispersing the dried short carbon fibers to obtain a magnetized short carbon fiber material;
step 2, adding the magnetized short carbon fiber material into the 3D printed plastic powder in a proportion of 6 wt%, and mixing the magnetized short carbon fiber material and the plastic powder uniformly by adopting ball milling;
and 3, connecting a 0.5T magnetic field to the upper part and the lower part of the conventional 3D printing powder box, and performing 3D printing according to a normal 3D printing process to obtain the 3D printing part with the enhanced interface.
A TEM image of a single-layer short carbon fiber-containing material printed by 3D printing according to the invention is shown in FIG. 1, wherein the content of the short carbon fiber is 6 wt%, and the distribution of the short carbon fiber is uniform as shown in FIG. 1;
by using the invention to print the section TEM image of the plastic product in a multilayer 3D way, as shown in FIG. 2, it can be seen that the carbon nano tube is erected in the plastic curing and forming process and can effectively penetrate through the interface, so that the penetration error of the carbon nano tube or the short carbon fiber on the interface formed by different 3D printing passes is achieved, and the strength of the plastic 3D printing part is effectively increased because the carbon fiber material has better strength.
Claims (10)
1. A plastic powder 3D printing interface enhancing method is characterized by comprising the following steps:
step 1, magnetizing carbon nano tubes or short carbon fibers;
step 2, adding the magnetized carbon nano tube or short carbon fiber material obtained in the step 1 into 3D printed plastic powder, and uniformly mixing to obtain 3D printed powder;
and 3, adding the 3D printing powder mixed in the step 2 into a 3D printing powder box, then adding a magnetic field on the 3D printing powder box, and finally starting printing to obtain the interface-enhanced 3D printing part.
2. The plastic powder 3D printing interface enhancement method as claimed in claim 1, wherein the carbon nanotubes or short carbon fibers in step 1 have a length of not more than 0.1mm and a diameter of not more than 0.1 μm.
3. The plastic powder 3D printing interface enhancement method as claimed in claim 1, wherein the magnetization process in step 1 is as follows: mixing the carbon nano tube or the short carbon fiber with iron ions, then adding ammonia water for reaction, filtering the carbon nano tube or the short carbon fiber, and finally drying, grinding and dispersing the filtered carbon nano tube or the short carbon fiber to obtain the magnetized carbon nano tube or the short carbon fiber material.
4. The plastic powder 3D printing interface enhancement method as claimed in claim 3, wherein the mixing ratio of the carbon nanotubes or short carbon fibers to iron ions is 4-5: 1.
5. The plastic powder 3D printing interface enhancement method as claimed in claim 3, wherein the iron ions are prepared into a 0.2-0.3 wt% solution before mixing.
6. The plastic powder 3D printing interface enhancement method as claimed in claim 3, wherein the iron ions comprise Fe+3And Fe+2，Fe+3And Fe+2In a ratio of 4: 7.
7. The plastic powder 3D printing interface enhancement method according to claim 3, wherein in the step 1, the carbon nanotubes or short carbon fibers and iron ions are mixed and stirred at room temperature for 1-2 h, then 10-20 wt% of ammonia water is added, and then the mixture is stirred for 0.5-1 h and then filtered.
8. The plastic powder 3D printing interface enhancement method according to claim 3, wherein the temperature in the drying process is 90-95 ℃, and the drying time is 7-12 hours.
9. The plastic powder 3D printing interface enhancement method according to claim 1, wherein in the step 2, the magnetized carbon nano tubes or short carbon fiber materials are mixed with the 3D printed plastic powder in a proportion of 3-6 wt%, and the 3D printed plastic powder is thermosetting type and thermoplastic type 3D printed plastic powder, and then ball milling and mixing are carried out.
10. The plastic powder 3D printing interface enhancement method as claimed in claim 1, wherein in the step 3, a magnetic field of 0.2-0.5T is applied to the upper portion and the lower portion of the 3D printing powder box.
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| CN202010168436.7A CN111923404A (en) | 2020-03-12 | 2020-03-12 | Plastic powder 3D printing interface enhancing method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113844032A (en) * | 2021-09-24 | 2021-12-28 | 深圳森工科技有限公司 | Printed material and method for enhancing strength of printed material |
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2020
- 2020-03-12 CN CN202010168436.7A patent/CN111923404A/en active Pending
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| KR101786384B1 (en) * | 2016-09-07 | 2017-11-15 | 현대자동차주식회사 | Apparatus and method manufacturing fiber reinforced plastic products |
| CN106891518A (en) * | 2017-02-27 | 2017-06-27 | 上海大学 | What a kind of chopped carbon fiber and thermoplastic composite mixed aligns processing unit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113844032A (en) * | 2021-09-24 | 2021-12-28 | 深圳森工科技有限公司 | Printed material and method for enhancing strength of printed material |
| CN113844032B (en) * | 2021-09-24 | 2023-12-26 | 深圳森工科技有限公司 | Printed material and strength enhancement method for printed material |
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