CN116945608A - Heat-absorbing ink-jet 3D printing part and preparation method thereof - Google Patents
Heat-absorbing ink-jet 3D printing part and preparation method thereof Download PDFInfo
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- 238000010146 3D printing Methods 0.000 title abstract description 27
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- 238000007639 printing Methods 0.000 claims abstract description 49
- 229920000642 polymer Polymers 0.000 claims abstract description 44
- 238000010438 heat treatment Methods 0.000 claims abstract description 28
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- 239000000839 emulsion Substances 0.000 claims description 6
- 239000004205 dimethyl polysiloxane Substances 0.000 claims description 5
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims description 5
- -1 polydimethylsiloxane Polymers 0.000 claims description 5
- 238000005698 Diels-Alder reaction Methods 0.000 claims description 4
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Classifications
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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
- B29C64/386—Data acquisition or data processing for additive manufacturing
- B29C64/393—Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
-
- 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
- B29C64/165—Processes of additive manufacturing using a combination of solid and fluid materials, e.g. a powder selectively bound by a liquid binder, catalyst, inhibitor or energy absorber
-
- 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
- B29C64/264—Arrangements for irradiation
-
- 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
- B33Y50/00—Data acquisition or data processing for additive manufacturing
- B33Y50/02—Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
-
- 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
- B33Y80/00—Products made by additive manufacturing
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Optics & Photonics (AREA)
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Abstract
The invention discloses an endothermic ink-jet 3D printing part and a preparation method thereof, comprising the steps of slicing a three-dimensional model by a computer to obtain contour information of each layer of section; loading dynamic polymer powder with dynamic chemical bonds into a material spreading groove, loading dynamic ink into an ink box connected with a spray head, and preheating a printing bed; adopting a roller to roll and spread materials, and spraying ink by a spray head according to the patterns of the section of the slice; the near infrared lamp moves at a constant speed, irradiates and heats the powder material, and heats and forms; and finally cleaning the surface of the workpiece, and then performing constant-temperature heating post-treatment. The method adopted by the invention can effectively improve the binding force between printing layers (in the direction of the z axis) and improve the mechanical property of the workpiece; the product printed by the method can repair damage under the heating condition, and the service life of the product is prolonged; meanwhile, the printed product can have the function of shape memory, and can realize shape change and recovery under the stimulation of heat, force, light, electricity and the like.
Description
Technical Field
The invention belongs to the technical field of additive manufacturing, and particularly relates to a preparation method of an endothermic ink-jet 3D printing part and a 3D printing part prepared by the preparation method.
Background
With the development of human society, 3D additive manufacturing technology has been developed. The 3D printing technology is based on digital model files, and uses a powdery metal or plastic or other bondable material to construct an object in a layer-by-layer printing mode. Through 3D printing technology people can easily realize complex structure's integrated into one piece. Inkjet 3D printing technology is essentially a technology that uses inkjet and powder to fabricate parts. In recent years, an endothermic ink-jet 3D printing technology for the polymer field is widely focused, region sintering can be realized, efficiency is higher, and a printing piece has good mechanical properties, so that the endothermic ink-jet 3D printing technology is an important development direction of current polymer material 3D printing.
The heat absorption ink-jet 3D printing is based on additive manufacturing, a three-dimensional model is designed firstly, the model is processed in a layering mode through software and stored as corresponding processing information, and then a printer roller is paved with powder with a certain thickness on a workbench; then the substrate integrally preheats the powder deposition layer, so that the preheating temperature is close to the sintering temperature of the material; the printing nozzle sprays heat absorption ink on the polymer powder according to the selected area of the model, and the heat absorption ink contains heat absorption fillers such as carbon black and the like and can convert absorbed near infrared light into heat energy; the near infrared lamp irradiates the powder bed, the polymer powder in the ink spraying area is sintered and solidified due to absorbing more heat, and the powder temperature in the area without the infrared light absorbing material is lower and still in powder shape; and finally obtaining the corresponding three-dimensional entity through sintering and stacking layer by layer.
Inspired by the cases of animal skin damage healing in nature, researchers at home and abroad design and synthesize a plurality of self-repairing high polymer materials, and when the materials are damaged, cracks can be refilled and repaired by themselves through a certain mechanism, thereby having important significance for prolonging the service life of the materials, improving the durability and reducing the maintenance cost. To date, reported self-healing polymer build strategies can be divided into the following 2 classes: foreign and intrinsic types. For the intrinsic self-repairing polymer in the current research hot spot, a dynamic reversible bond is introduced into a molecular chain of the intrinsic self-repairing polymer, dynamic exchange is realized under a certain stimulus, and damage is repaired.
Polymers (Basel) 2021, 13 (13) the physicochemical properties of the polymer powder were systematically characterized using multi-jet Melting (MJF) and the mechanical properties and print quality of the printed samples were evaluated. In this study, it was found that the tensile strength of The Polyurethane (TPU) printed article in the z-axis direction was the lowest relative to the x-axis direction and the y-axis direction, as shown in fig. 1. The reason for the lower strength of the printed product in the z-axis direction may be that there is a temperature difference between the powder layers during printing, only the powder on the upper layer is heated more when the near infrared light irradiates, and the powder on the lower layer is heated less, so that the bonding between the powder on the upper layer is firm, and the bonding between the powder on the upper layer and the powder on the lower layer is relatively poor.
The distribution of the infrared Radiation Absorbing Material (RAM) in the ink over the polymer powder when printing different polymers using High Speed Sintering (HSS) at the same print density was investigated in additive manufacturing2021, 47 by measuring the color of the parts of the article. Wherein the powder particle sizes and morphology of PA12, PA11, PP, PEBAX and Polystyrene (PS) were also analyzed in this study, and the Hausner ratio of the powder was studied to compare the differences in flowability and powder porosity of the different materials. Further it is concluded that: the powder particle shape and porosity also have an effect on the wettability of the ink and thus the sintering quality of the final part. But for either polymer powder it is not possible to flow completely like a fluid nor to reach zero porosity. Thus, after printing it, there must be more or less voids and cavities inside the article, especially for polymer powders with poor powder flowability and high powder porosity. And the pores and hollows in the workpiece can greatly influence the mechanical properties of the workpiece, so that defects and stress concentration points are formed, and the mechanical properties are greatly reduced.
Based on the analysis, a printing method and a printing piece with high internal space density and stable mechanical property are urgently needed in the industry at present.
Disclosure of Invention
Aiming at the problems that the mechanical property of a workpiece is reduced because more pores and holes exist in a printed workpiece sample in the prior art, and the workpiece is difficult to recycle after being damaged, the dynamic polymer is used as a powder material for inkjet 3D printing for the first time, the polymer ink containing the same dynamic bonds is used for carrying out endothermic inkjet 3D printing, the powder and the powder are combined to form a strong integral workpiece, and then the workpiece is heated at a certain temperature for post-treatment, so that the dynamic bond combination is more complete, the pores and the holes in the workpiece are effectively reduced, the workpiece is more complete, and the mechanical property of the workpiece is improved; the product printed by the method can improve the bonding force between the printing layers, improve the mechanical strength of printing in the z-axis direction and solve the problem that the printed product has anisotropy; meanwhile, the self-repairing of the manufactured piece after the damage is realized, so that the aim of recycling is fulfilled, and the service life of the manufactured piece is prolonged; the printed product has the shape memory function due to the characteristic of dynamic polymer, and realizes the deformation and recovery under the stimulation of heat, force, light, points and the like. The invention is realized by the following technical means:
a method of preparing an endothermic inkjet 3D printed article comprising:
(1) Computer slicing is carried out on the three-dimensional model to be printed, and contour information of each layer of section is obtained;
(2) Loading dynamic polymer powder with dynamic chemical bonds into a material spreading groove, loading dynamic ink containing infrared absorption filler into an ink box connected with a spray head, and preheating a printing bed;
(3) Adopting a roller to roll and spread materials, and spraying ink by a spray head according to the patterns of the section of the slice;
(4) The near infrared lamp moves at a constant speed, and irradiates and heats the powder material;
(5) Lowering the printing bed for a certain distance, repeating the operation of the step (3) and the step (4) until printing is finished, and forming the product;
(6) Cleaning the surface of the workpiece, and then performing constant-temperature heating post-treatment to obtain the product.
Further, the dynamic polymer powder in step (2) is all dynamic polymer powder capable of 3D printing, including but not limited to: dynamic polyurethane powder, dynamic polydimethylsiloxane powder, and the like.
Further, the particle size of the polymer powder is 20-200 mu m.
Further, the dynamic bonds in the step (2) are all dynamic bonds that can be introduced into the high molecular material to synthesize dynamic polymers, including but not limited to: dynamic urethane linkages, dynamic urea linkages, diels-Alder linkages, disulfide linkages, oxime-urethane linkages, thiol olefinic linkages, transesterification linkages, borate transesterification linkages, and the like.
Further, the dynamic ink in step (2) is a dynamic polymer dispersed ink containing the same dynamic bonds as the polymer powder material, including but not limited to: aqueous polyurethane emulsion, aqueous polydimethylsiloxane emulsion, and the like.
Further, the infrared absorption filler in the step (2) is one or more of carbon nanotubes, graphene and conductive carbon black.
Further, the preheating temperature of the printing bed in the step (2) is 5-10 ℃ lower than the glass transition temperature of the dynamic polymer powder.
Further, the near infrared lamp in the step (4) is short-wave infrared radiation with the wavelength of 500-1400 nm, the power of 0-2000W and the moving speed of 5-30 cm/s.
Further, the certain distance in the step (5) is 0.05-0.5 mm.
Further, the constant temperature heating post-treatment in the step (6) is as follows: and (3) using constant-temperature heating equipment such as an oven and the like to post-treat the workpiece at the dynamic self-repairing temperature of the dynamic key for 0.5-24 h.
The invention also discloses an endothermic ink-jet 3D printing part prepared by any one of the preparation methods.
The invention has the beneficial effects that:
in the prior art, the powder is paved layer by layer, ink is sprayed layer by layer, and the product is printed in a mode of heating and curing by layer near infrared light, wherein the powder is piled up and exists in pores, so that pores and cavities exist in the printed product, and the mechanical property is reduced; in addition, the temperature difference exists between each printed layer, and the bonding force between the layers is not strong; meanwhile, the printed workpiece cannot be repaired after being damaged, and the recovery process is complex and tedious. When the dynamic polymer powder and the dynamic ink are used for printing, after near infrared light is heated, not only the powder is combined with the powder through dynamic bonds, but also the ink is combined with the powder through the dynamic bonds, so that the ink serves as a binder, the pores are filled, the powder is combined more firmly, and the mechanical property of a finished product is more excellent. In addition, through the process of heating post-treatment, the further combination of dynamic bonds is promoted, the repair of pores and hollows in the workpiece is promoted, the defects are reduced, and the mechanical properties are further improved. Meanwhile, the problem of poor combination between printing layers can be solved, the mechanical strength in the z-axis direction is improved, and the problem of material anisotropy is solved. After the workpiece is subjected to micro-damage such as cracks, the damaged part can be repaired by only putting the workpiece into constant temperature equipment with dynamic repair temperature, and part of the damaged part and even the original mechanical property can be restored again, so that the workpiece can be repeatedly used, and the service life of the workpiece is prolonged. In addition, based on the characteristics of the dynamic polymer, the printed article can have a shape memory function, achieving deformation and recovery of shape under stimulation of heat, force, light, electricity, etc.
Drawings
FIG. 1 is a schematic diagram of an x-axis, y-axis, and z-axis printing.
Fig. 2 is a flow chart of a printing method.
Fig. 3 is a cross-sectional scanning electron micrograph of an article printed by an endothermic inkjet 3D printing method based on a dynamic polymer, wherein a graph a is a cross-sectional photograph after printing without constant temperature heat post-treatment, and b is a cross-sectional photograph after constant temperature heat post-treatment.
Fig. 4 is the mechanical properties of the tensile bars after hot press molding, post-printing non-post-constant temperature heating treatment and post-constant temperature heating treatment of example 1 and comparative example 1, wherein a graph is the mechanical properties of the tensile bars after hot press molding, post-printing non-post-constant temperature heating treatment and post-constant temperature heating treatment of example 1, and b graph is the mechanical properties of the tensile bars after hot press molding, post-printing non-constant temperature heating treatment and post-constant temperature heating treatment of comparative example 1.
Fig. 5 shows the mechanical properties of the spline printed in the x-axis, y-axis and z-axis directions in example 1 and comparative example 1, wherein a graph a shows the mechanical properties of the spline printed in the x-axis, y-axis and z-axis directions in example 1, and b graph b shows the mechanical properties of the spline printed in the x-axis, y-axis and z-axis directions in comparative example 1.
FIG. 6 is a graph showing crack disappearance after repair of a spline printed by the dynamic polymer-based endothermic inkjet 3D printing method at a dynamic repair temperature.
Detailed Description
The invention is further described by the following detailed description. The examples are presented solely to facilitate the understanding and application of the invention and are not intended to limit the protection of the invention.
Example 1:
an endothermic inkjet 3D printed article and method of making the same, comprising:
(1) Computer slicing is carried out on the three-dimensional model to be printed, and contour information of each layer of section is obtained;
(2) Loading dynamic polymer powder with dynamic chemical bonds into a material spreading groove, loading dynamic ink containing infrared absorption filler into an ink box connected with a spray head, and preheating a printing bed;
(3) Adopting a roller to roll and spread materials, and spraying ink by a spray head according to the patterns of the section of the slice;
(4) The near infrared lamp moves at a constant speed, and irradiates and heats the powder material;
(5) Lowering the printing bed for a certain distance, repeating the operation of the step (3) and the step (4) until printing is finished, and forming the product;
(6) Cleaning the surface of the workpiece, and then performing constant-temperature heating post-treatment to obtain the product.
Wherein: the dynamic polymer powder is dynamic polyurethane powder containing Diels-Alder bonds, and the particle size is 100 mu m; the dynamic ink is aqueous polyurethane emulsion containing Diels-Alder bonds; the infrared absorption filler is conductive carbon black; the preheating temperature of the printing bed is 60 ℃; the wavelength of near infrared light is 650nm, the power is 1200W, and the moving speed is 5cm/s; the descending distance of the printing bed is 0.1mm; and the constant-temperature heating post-treatment is to put the workpiece into a constant-temperature oven, wherein the temperature is 120 ℃ and the treatment time is 1h.
Example 2:
an endothermic inkjet 3D printed article and method of making the same, comprising:
(1) Computer slicing is carried out on the three-dimensional model to be printed, and contour information of each layer of section is obtained;
(2) Loading dynamic polymer powder with dynamic chemical bonds into a material spreading groove, loading dynamic ink containing infrared absorption filler into an ink box connected with a spray head, and preheating a printing bed;
(3) Adopting a roller to roll and spread materials, and spraying ink by a spray head according to the patterns of the section of the slice;
(4) The near infrared lamp moves at a constant speed, and irradiates and heats the powder material;
(5) Lowering the printing bed for a certain distance, repeating the operation of the step (3) and the step (4) until printing is finished, and forming the product;
(6) Cleaning the surface of the workpiece, and then performing constant-temperature heating post-treatment to obtain the product.
Wherein: the dynamic polymer powder is dynamic polydimethylsiloxane powder containing steric hindrance pyrazole urea bond, and the particle size is 130 mu m; the dynamic ink is aqueous polyurethane emulsion containing steric hindrance pyrazole urea bond; the infrared absorption filler is a carbon nano tube; the preheating temperature of the printing bed is 75 ℃; the wavelength of near infrared light is 650nm, the power is 1000W, and the moving speed is 10cm/s; the descending distance of the printing bed is 0.15mm; and the constant-temperature heating post-treatment is to put the workpiece into a constant-temperature oven, wherein the temperature is 110 ℃ and the treatment time is 1h.
Comparative example 1:
a method of endothermic inkjet 3D printing and thermal post-treatment based on a non-dynamic polymer, comprising:
(1) Computer slicing is carried out on the three-dimensional model to be printed, and contour information of each layer of section is obtained;
(2) Filling non-dynamic polymer powder into a material spreading groove, filling common ink containing infrared absorption filler into an ink box connected with a spray head, and preheating a printing bed;
(3) Adopting a roller to roll and spread materials, and spraying ink by a spray head according to the patterns of the section of the slice;
(4) The near infrared lamp moves at a constant speed, and irradiates and heats the powder material;
(5) Lowering the printing bed for a certain distance, repeating the operation of the step (3) and the step (4) until printing is finished, and forming the product;
(6) Cleaning the surface of the workpiece, and then performing constant-temperature heating post-treatment to obtain the product.
Wherein: the polymer powder is commercial polyurethane powder with the particle size of 75 mu m; the ink is common ink containing carbon nano tubes; the preheating temperature of the printing bed is 115 ℃; the wavelength of near infrared light is 650nm, the power is 1500W, and the moving speed is 5cm/s; the descending distance of the printing bed is 0.08mm; the constant temperature heating post-treatment is to put the product into a constant temperature oven, the temperature is 120 ℃ and the treatment time is 1h
Test example 1
And (3) testing: mechanical property tests were performed by printing 1mm thick bars under the conditions of example 1 and comparative example 1, and comparing the bars with bars obtained by hot pressing two materials, and comparing two different methods to obtain differences in mechanical properties between the bars and the bars formed by hot pressing, and the results are shown in tables 1 and 2.
Scanning electron microscopy photographs were taken of the sections of the bars printed in example 1 without constant temperature heat post-treatment and the bars printed with constant temperature heat post-treatment, and the results are shown in fig. 3.
Table 1 comparison of properties of different bars of example 1
Table 2 comparison of the properties of the different bars of comparative example 1
From the results in tables 1 and 2, it is clear that the tensile strength of the spline obtained by performing endothermic inkjet 3D printing with the dynamic polymer powder and the dynamic ink in example 1, which was not subjected to constant temperature heating post-treatment after printing, could reach 78.23% of the hot press molded spline, and the tensile strength of the spline subjected to constant temperature heating post-treatment could reach 92.60% of the hot press molded spline, and the performance was greatly improved; in comparative example 1, the spline obtained by performing endothermic inkjet 3D printing with the common commercial polyurethane powder and the common ink has little change in mechanical properties before and after the constant temperature heating post-treatment after printing, and the tensile strength of the spline is 65.99% of that of the spline formed by hot pressing, so that the product printed by the endothermic inkjet 3D printing method based on the dynamic polymer can obtain more excellent mechanical properties.
Meanwhile, as can be seen from the results of fig. 3, the voids and the hollows in the spline subjected to the constant temperature heating post-treatment are greatly reduced, which is obtained by scanning electron microscope photographing the section of the spline subjected to the constant temperature heating post-treatment after printing and the section of the spline subjected to the constant temperature heating post-treatment after printing in example 1.
Test example 2
And (3) testing: mechanical properties of 1mm thick bars printed in the x-axis, y-axis, and z-axis directions were tested and compared using the conditions of example 1 and comparative example 1, respectively, and the results are shown in tables 3 and 4.
Table 3 comparison of spline Performance printed in x-axis, y-axis, z-axis directions for example 1
Table 4 comparison of spline Performance printed in x-axis, y-axis, z-axis directions for comparative example 1
From the results of tables 3 and 4, it is clear that the sample bar obtained by performing endothermic inkjet 3D printing using the dynamic polymer powder and the dynamic ink in example 1 has little difference in mechanical properties between the x-axis and y-axis printed sample bars, and the tensile strength of the z-axis printed sample bar can reach 90.53% in the x-axis direction; whereas the spline obtained by endothermic inkjet 3D printing using the general commercial polyurethane powder and the general ink in comparative example 1 had a tensile strength of only 75.79% in the x-axis direction for the z-axis direction printed spline, which indicates that the dynamic polymer-based endothermic inkjet 3D printing method printed article did improve the strength in the z-axis direction.
Test example 3
And (3) testing: crack repair experiments were performed using the spline printed in example 1, and the results are shown in fig. 6.
As can be seen from the results of fig. 6, the spline obtained by endothermic inkjet 3D printing using the dynamic polymer powder and the dynamic ink can be successfully repaired by heating at constant temperature at the dynamic repair temperature in the presence of crack damage, and the product can be reused.
In summary, the method for performing endothermic inkjet 3D printing and heat post-treatment by using the dynamic polymer and the dynamic ink containing the same dynamic bond can effectively reduce the pores and the hollows in the printed product and improve the mechanical property of the product; meanwhile, the method can improve the bonding force between layers during printing, greatly improve the mechanical property of the printed part in the z-axis direction, and solve the problem that the mechanical property of the printed part has anisotropy; after the workpiece printed by the method is damaged to generate cracks, defects and the like, the workpiece can be damaged and repaired by means of heating and the like, so that the workpiece can be recycled, and the service life of the workpiece is prolonged; in addition, the printed product also has the function of shape memory.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A method of preparing an endothermic inkjet 3D printed article comprising:
(1) Computer slicing is carried out on the three-dimensional model to be printed, and contour information of each layer of section is obtained;
(2) Loading dynamic polymer powder with dynamic chemical bonds into a material spreading groove, loading dynamic ink containing infrared absorption filler into an ink box connected with a spray head, and preheating a printing bed;
(3) Adopting a roller to roll and spread materials, and spraying ink by a spray head according to the patterns of the section of the slice;
(4) The near infrared lamp moves at a constant speed, and irradiates and heats the powder material;
(5) Lowering the printing bed for a certain distance, repeating the operation of the step (3) and the step (4) until printing is finished, and forming the product;
(6) Cleaning the surface of the workpiece, and then performing constant-temperature heating post-treatment for 0.5-24 hours to obtain the product.
2. The method of manufacturing according to claim 1, wherein:
the dynamic polymer powder of step (2) comprises:
dynamic polyurethane powder, dynamic polydimethylsiloxane powder.
3. The preparation method according to claim 2, wherein:
the particle size of the polymer powder is 20-200 mu m.
4. The method of manufacturing according to claim 1, wherein:
the dynamic key of step (2) includes:
dynamic urethane linkages, dynamic urea linkages, diels-Alder linkages, disulfide linkages, oxime-urethane linkages, thiol olefinic linkages, transesterification linkages, borate transesterification linkages.
5. The method of manufacturing according to claim 1, wherein:
the dynamic ink of step (2) comprises:
aqueous polyurethane emulsion, aqueous polydimethylsiloxane emulsion.
6. The method of manufacturing according to claim 1, wherein:
the infrared absorbing filler of step (2) comprises:
one or more of carbon nanotubes, graphene and conductive carbon black.
7. The method of manufacturing according to claim 1, wherein:
and (3) the preheating temperature of the printing bed in the step (2) is 5-10 ℃ lower than the glass transition temperature of the dynamic polymer powder.
8. The method of manufacturing according to claim 1, wherein:
the wavelength of the near infrared lamp in the step (4) is 500-1400 nm, the power is 0-2000W, and the moving speed is 5-30 cm/s.
9. The method of manufacturing according to claim 1, wherein:
the certain distance in the step (5) is 0.05-0.5 mm.
10. An endothermic inkjet 3D printed article made according to the method of any one of claims 1 to 9.
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