CN113652082A - 3D printing molded nylon 12/compound heat-conducting filler special-shaped heat-conducting part - Google Patents

3D printing molded nylon 12/compound heat-conducting filler special-shaped heat-conducting part Download PDF

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CN113652082A
CN113652082A CN202110894076.3A CN202110894076A CN113652082A CN 113652082 A CN113652082 A CN 113652082A CN 202110894076 A CN202110894076 A CN 202110894076A CN 113652082 A CN113652082 A CN 113652082A
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heat
conducting
nylon
conducting filler
special
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吴唯
胡焕波
袁月
刘冬梅
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East China University of Science and Technology
Oechsler Plastic Products Taicang Co Ltd
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East China University of Science and Technology
Oechsler Plastic Products Taicang Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • 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
    • 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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K13/00—Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
    • C08K13/06—Pretreated ingredients and ingredients covered by the main groups C08K3/00 - C08K7/00
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/02—Elements
    • C08K3/04—Carbon
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/02—Elements
    • C08K3/04—Carbon
    • C08K3/041—Carbon nanotubes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/34—Silicon-containing compounds
    • C08K3/36—Silica
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/38—Boron-containing compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K7/00—Use of ingredients characterised by shape
    • C08K7/02—Fibres or whiskers
    • C08K7/04—Fibres or whiskers inorganic
    • C08K7/06—Elements
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K9/00—Use of pretreated ingredients
    • C08K9/02—Ingredients treated with inorganic substances
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2227—Oxides; Hydroxides of metals of aluminium
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/38—Boron-containing compounds
    • C08K2003/382—Boron-containing compounds and nitrogen
    • C08K2003/385—Binary compounds of nitrogen with boron
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00—Specific properties of additives
    • C08K2201/011—Nanostructured additives

Abstract

The invention discloses a nylon 12/compound heat-conducting filler special-shaped heat-conducting part formed by 3D printing, which specifically comprises the following steps: carrying out surface treatment on the heat-conducting filler, and preparing composite powder with uniformly mixed nylon 12, modified heat-conducting filler and sintering aid by adopting a mechanical mixing method; designing a three-dimensional CAD model, processing the three-dimensional graph to obtain data information of each processing layer, storing the data information as an STL file, and importing the STL file into SLS forming equipment; and setting appropriate molding process parameters such as preheating temperature, laser power, scanning speed, scanning interval, powder spreading thickness and the like, and carrying out SLS molding on the nylon 12 composite powder to obtain the nylon 12/compound heat-conducting filler special-shaped heat-conducting part. The forming process is simple, the flexibility is high, the preparation of the special-shaped heat-conducting part with the complex structure can be realized, the requirements of different application occasions are met, and the prepared special-shaped heat-conducting part with the nylon 12/compound heat-conducting filler has excellent heat-conducting property and mechanical property.

Description

3D printing molded nylon 12/compound heat-conducting filler special-shaped heat-conducting part
Technical Field
The invention belongs to the field of functional polymer materials prepared by an additive manufacturing technology, and particularly relates to a nylon 12/compound heat-conducting filler special-shaped heat-conducting part formed by 3D printing, in particular to a nylon 12/compound heat-conducting filler special-shaped heat-conducting part applied to preparation of an automobile heat dissipation cover with a complex shape.
Background
In recent years, with the rapid development of science and technology, more stringent requirements are put on heat conducting materials in many fields such as electronics and electrical, automobile industry and aerospace. The polymer material has excellent electrical insulation performance and chemical corrosion resistance, is light, high in strength and easy to process, but has very low thermal conductivity due to the structural characteristics, and can not meet the use requirement of a thermal management material. The incorporation of thermally conductive fillers into polymers is the most common method of increasing their thermal conductivity. However, there are still some challenges in preparing thermally conductive polymeric materials. The above-mentioned methods for forming thermally conductive polymer materials are mainly based on conventional processing techniques, such as compression molding and injection molding. Although these conventional processing techniques have certain advantages, such as short molding cycles and high production efficiency, it is difficult to achieve the fabrication of thermally conductive polymer materials of complex shapes and structures.
The Selective Laser Sintering (SLS) technology utilizes the basic principle of high-temperature Sintering of powder materials under Laser irradiation, controls a light source positioning device through a computer to realize accurate positioning, and then sinters and piles up to form layer by layer. The SLS technology has the advantages of wide applicable materials (including high polymers, metals, ceramic materials and the like), no need of support, high forming precision and the like, so the technology plays an important role in the field of additive manufacturing. The technology can realize the design and development of a complex structure, greatly reduce the cost, shorten the molding period, improve the utilization rate of materials and improve the precision of a finished piece. Wherein, nylon 12 is the best material for directly preparing plastic functional parts by the SLS forming technology at present, and the formed part obtained by adopting the laser sintering of nylon 12 powder has excellent performance, high strength and good toughness. Therefore, the nylon 12 special-shaped heat-conducting part formed by using the selective laser sintering technology has a very wide application prospect.
Disclosure of Invention
In order to overcome the problem that the traditional forming method is difficult to meet the preparation requirement of a heat-conducting polymer part with a complex shape, the invention provides a selective laser sintering forming process of a nylon 12/compound heat-conducting filler special-shaped heat-conducting part. The nylon 12 special-shaped heat-conducting part can be effectively molded without a mold, and the requirements of different application occasions are met. The nylon 12/compound heat-conducting filler special-shaped heat-conducting part formed by the process has excellent heat-conducting property, high precision, good surface quality and good mechanical property, and can be widely applied to the field of heat-conducting materials.
In order to achieve the purpose, the invention provides a nylon 12/compound heat-conducting filler special-shaped heat-conducting part formed by 3D printing, which specifically comprises the following steps:
(1) carrying out surface treatment on the heat-conducting filler, and preparing composite powder with uniformly mixed nylon 12, modified heat-conducting filler and sintering aid by adopting a mechanical mixing method;
(2) designing a three-dimensional CAD model, processing the three-dimensional graph to obtain data information of each processing layer, storing the data information as an STL file, and importing the STL file into SLS forming equipment;
(3) setting appropriate molding process parameters such as preheating temperature, laser power, scanning speed, scanning interval, powder laying thickness and the like, and carrying out SLS molding on the nylon 12 composite powder;
(4) and naturally cooling the printed and molded part in a molding cylinder, taking out the printed and molded part after the temperature is reduced to be below 80 ℃, and removing residual powder on the surface through sand blasting post-treatment to obtain the nylon 12/compound heat-conducting filler special-shaped heat-conducting part.
Further, the 3D printing technique is a Selective Laser Sintering (SLS) technique.
Furthermore, the compound heat-conducting filler takes alumina as a main component and is compounded with other components.
Further, the other component is one or more of boron nitride, carbon fiber and carbon nano tube.
Further, the thermally conductive filler needs to be subjected to certain surface modification.
Further, the sintering aid is nano silicon dioxide, and the mass fraction is 1-3%.
Further, the powder mixing time of the mechanical mixing method is 4-8 hours.
Further, the SLS molding process parameters are as follows: the preheating temperature is 170-173 ℃, the laser power is 40-50W, the laser scanning speed is 8800-10160 mm/s, the scanning interval is 0.15-0.3 mm, and the powder spreading thickness is 0.1-0.2 mm.
Compared with the prior art, the invention has the following beneficial effects:
(1) the process solves the problems of complex forming process, higher cost, low precision and the like of some special-shaped heat-conducting parts, and can realize the large-scale production of the special-shaped heat-conducting parts.
(2) The process is simple to operate and high in flexibility, can realize effective molding of a workpiece with a complex structure, effectively reduces the problems of deformation, cracking and collapse of the complex structure during molding, does not need a die, and reduces the manufacturing cost.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to specific experimental data, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The following provides a nylon 12/compound heat conduction filler dysmorphism heat conduction finished piece of adopting 3D to print shaping, the 3D printing technique is Selective Laser Sintering (SLS) technique.
The compound heat-conducting filler is mainly alumina and is compounded with other components.
The other components are one or more of boron nitride, carbon fiber and carbon nano tube.
The thermally conductive filler needs to be subjected to certain surface modification.
The sintering aid is nano silicon dioxide with the mass fraction of 1-3%.
The powder mixing time of the mechanical mixing method is 4-8 h.
The SLS forming process parameters are as follows: the preheating temperature is 170-173 ℃, the laser power is 40-50W, the laser scanning speed is 8800-10160 mm/s, the scanning interval is 0.15-0.3 mm, and the powder spreading thickness is 0.1-0.2 mm.
Example 1
(1) Preparing a 25% ethanol solution of a silane coupling agent KH550, then weighing 49 wt% of alumina powder, 1 wt% of nano-silica and 50 wt% of PA12 powder, putting the materials into a high-speed mixer, and spraying the silane coupling agent KH550 solution in a fine mist form under stirring, wherein the dosage of KH550 is 1 wt% of the mass of the filler, and the mixing time is 4 hours.
(2) Dividing the designed three-dimensional CAD model into different cross sections, storing the cross sections as STL files, guiding the STL files into SLS forming equipment, setting SLS process parameters, preheating temperature of 171 ℃, laser power of 40W, scanning speed of 10160mm/s, scanning distance of 0.2mm and powder spreading thickness of 0.15mm, and then carrying out SLS forming on the mixed PA12 composite powder.
(3) And naturally cooling the printed and molded part in a molding cylinder, taking out the printed and molded part after the temperature is reduced to be below 80 ℃, and removing residual powder on the surface through sand blasting post-treatment to obtain the nylon 12/compound heat-conducting filler special-shaped heat-conducting part.
Example 2
(1) Preparing a 25% ethanol solution of a silane coupling agent KH550, then weighing 48 wt% of alumina powder, 2 wt% of nano-silica and 50 wt% of PA12 powder, putting the alumina powder, the nano-silica and the PA12 powder into a high-speed mixer, spraying the silane coupling agent KH550 solution in a fine mist state under stirring, wherein the dosage of KH550 is 1 wt% of the mass of the filler, and the mixing time is 6 hours.
(2) Dividing the designed three-dimensional CAD model into different cross sections, storing the cross sections as STL files, guiding the STL files into SLS forming equipment, setting SLS process parameters, preheating temperature of 172 ℃, laser power of 45W, scanning speed of 9600mm/s, scanning distance of 0.25mm and powder spreading thickness of 0.2mm, and then carrying out SLS forming on the mixed PA12 composite powder.
(3) And naturally cooling the printed and molded part in a molding cylinder, taking out the printed and molded part after the temperature is reduced to be below 80 ℃, and removing residual powder on the surface through sand blasting post-treatment to obtain the nylon 12/compound heat-conducting filler special-shaped heat-conducting part.
Example 3
(1) Preparing a 25% ethanol solution of a silane coupling agent KH550, then weighing 59 wt% of alumina powder, 1 wt% of nano-silica and 40 wt% of PA12 powder, putting the alumina powder, the 1 wt% of nano-silica and the 40 wt% of PA12 powder into a high-speed mixer, spraying a fine-mist silane coupling agent KH550 solution under stirring, wherein the dosage of KH550 is 1 wt% of the mass of the filler, and the mixing time is 6 hours.
(2) Dividing the designed three-dimensional CAD model into different cross sections, storing the cross sections as STL files, guiding the STL files into SLS forming equipment, setting SLS process parameters, preheating temperature 173 ℃, laser power 45W, scanning speed 9600mm/s, scanning distance 0.15mm and powder spreading thickness 0.15mm, and then carrying out SLS forming on the mixed PA12 composite powder.
(3) And naturally cooling the printed and molded part in a molding cylinder, taking out the printed and molded part after the temperature is reduced to be below 80 ℃, and removing residual powder on the surface through sand blasting post-treatment to obtain the nylon 12/compound heat-conducting filler special-shaped heat-conducting part.
Example 4
(1) Preparing a 25% ethanol solution of a silane coupling agent KH550, then weighing 69 wt% of alumina powder, 1 wt% of nano-silica and 40 wt% of PA12 powder, putting the materials into a high-speed mixer, spraying a fine-mist silane coupling agent KH550 solution under stirring, wherein the dosage of KH550 is 1 wt% of the mass of the filler, and the mixing time is 8 hours.
(2) Dividing the designed three-dimensional CAD model into different cross sections, storing the cross sections as STL files, guiding the STL files into SLS forming equipment, setting SLS process parameters, preheating temperature 173 ℃, laser power 50W, scanning speed 8800mm/s, scanning distance 0.15mm and powder spreading thickness 0.15mm, and then carrying out SLS forming on the mixed PA12 composite powder.
(3) And naturally cooling the printed and molded part in a molding cylinder, taking out the printed and molded part after the temperature is reduced to be below 80 ℃, and removing residual powder on the surface through sand blasting post-treatment to obtain the nylon 12/compound heat-conducting filler special-shaped heat-conducting part.
Example 5
(1) Preparing a 25% ethanol solution of a silane coupling agent KH550, weighing 39 wt% of alumina powder, 10 wt% of boron nitride powder subjected to NaOH alkali treatment, 1 wt% of nano-silica and 50 wt% of PA12 powder, putting the materials into a high-speed mixer, spraying a fine-mist silane coupling agent KH550 solution under stirring, wherein the dosage of KH550 is 1 wt% of the mass of the filler, and the mixing time is 6 h.
(2) Dividing the designed three-dimensional CAD model into different cross sections, storing the cross sections as STL files, guiding the STL files into SLS forming equipment, setting SLS process parameters, preheating temperature 173 ℃, laser power 50W, scanning speed 8800mm/s, scanning distance 0.25mm and powder spreading thickness 0.15mm, and then carrying out SLS forming on the mixed PA12 composite powder.
(3) And naturally cooling the printed and molded part in a molding cylinder, taking out the printed and molded part after the temperature is reduced to be below 80 ℃, and removing residual powder on the surface through sand blasting post-treatment to obtain the nylon 12/compound heat-conducting filler special-shaped heat-conducting part.
Example 6
(1) Preparing a 25% ethanol solution of a silane coupling agent KH550, weighing 29 wt% of alumina powder, 20 wt% of boron nitride powder subjected to NaOH alkali treatment, 1 wt% of nano-silica and 50 wt% of PA12 powder, putting the materials into a high-speed mixer, spraying a fine-mist silane coupling agent KH550 solution under stirring, wherein the dosage of KH550 is 1 wt% of the mass of the filler, and the mixing time is 8 h.
(2) Dividing the designed three-dimensional CAD model into different cross sections, storing the cross sections as STL files, guiding the STL files into SLS forming equipment, setting SLS process parameters, preheating temperature of 170 ℃, laser power of 45W, scanning speed of 10160mm/s, scanning distance of 0.15mm and powder spreading thickness of 0.15mm, and then carrying out SLS forming on the mixed PA12 composite powder.
(3) And naturally cooling the printed and molded part in a molding cylinder, taking out the printed and molded part after the temperature is reduced to be below 80 ℃, and removing residual powder on the surface through sand blasting post-treatment to obtain the nylon 12/compound heat-conducting filler special-shaped heat-conducting part.
Example 7
(1) Preparing a silane coupling agent KH550 into a 25% ethanol solution, weighing 39 wt% of alumina powder, 8 wt% of boron nitride powder subjected to NaOH alkali treatment and 2 wt% of HNO3Putting the treated carbon nano tube, 1 wt% of nano silicon dioxide and 50 wt% of PA12 powder into a high-speed mixer, spraying a fine-mist silane coupling agent KH550 solution under stirring, wherein the dosage of KH550 is 1 wt% of the mass of the filler, and the mixing time is 6 h.
(2) Dividing the designed three-dimensional CAD model into different cross sections, storing the cross sections as STL files, guiding the STL files into SLS forming equipment, setting SLS process parameters, preheating temperature of 171 ℃, laser power of 45W, scanning speed of 9600mm/s, scanning distance of 0.2mm and powder spreading thickness of 0.15mm, and then carrying out SLS forming on the mixed PA12 composite powder.
(3) And naturally cooling the printed and molded part in a molding cylinder, taking out the printed and molded part after the temperature is reduced to be below 80 ℃, and removing residual powder on the surface through sand blasting post-treatment to obtain the nylon 12/compound heat-conducting filler special-shaped heat-conducting part.
Example 8
(1) Preparing a silane coupling agent KH550 into a 25% ethanol solution, and then weighing 29 wt% of alumina powder10 wt% of boron nitride powder treated with NaOH alkali, 10 wt% of boron nitride powder treated with HNO3Putting the treated carbon fiber, 1 wt% of nano silicon dioxide and 50 wt% of PA12 powder into a high-speed mixer, spraying a fine-mist silane coupling agent KH550 solution under stirring, wherein the dosage of KH550 is 1 wt% of the mass of the filler, and the mixing time is 8 h.
(2) Dividing the designed three-dimensional CAD model into different cross sections, storing the cross sections as STL files, guiding the STL files into SLS forming equipment, setting SLS process parameters, preheating temperature of 172 ℃, laser power of 50W, scanning speed of 9600mm/s, scanning distance of 0.15mm and powder spreading thickness of 0.15mm, and then carrying out SLS forming on the mixed PA12 composite powder.
(3) And naturally cooling the printed and molded part in a molding cylinder, taking out the printed and molded part after the temperature is reduced to be below 80 ℃, and removing residual powder on the surface through sand blasting post-treatment to obtain the nylon 12/compound heat-conducting filler special-shaped heat-conducting part.
Example 9
(1) Preparing a silane coupling agent KH550 into a 25% ethanol solution, and then weighing 39 wt% of alumina powder and 8 wt% of HNO32 wt% of the treated carbon fiber was subjected to HNO3Putting the treated carbon nano tube, 1 wt% of nano silicon dioxide and 50 wt% of PA12 powder into a high-speed mixer, spraying a fine-mist silane coupling agent KH550 solution under stirring, wherein the dosage of KH550 is 1 wt% of the mass of the filler, and the mixing time is 6 h.
(2) Dividing the designed three-dimensional CAD model into different cross sections, storing the cross sections as STL files, guiding the STL files into SLS forming equipment, setting SLS process parameters, preheating temperature 173 ℃, laser power 50W, scanning speed 8800mm/s, scanning distance 0.15mm and powder spreading thickness 0.15mm, and then carrying out SLS forming on the mixed PA12 composite powder.
(3) And naturally cooling the printed and molded part in a molding cylinder, taking out the printed and molded part after the temperature is reduced to be below 80 ℃, and removing residual powder on the surface through sand blasting post-treatment to obtain the nylon 12/compound heat-conducting filler special-shaped heat-conducting part.
Effect verification:
the nylon 12/compound heat-conducting filler profiled heat-conducting product materials obtained from the above examples 1, 2, 3, 4, 5, 6, 7, 8 and 9 were tested for performance according to the following criteria, wherein,
the tensile test was carried out on the specimens in accordance with GB/T1040-2006 standard. The test sample strips are dumbbell-shaped, the total length of the sample strips is 150mm, the distance between clamps is 115mm, the gauge length is 50mm, and the stretching speed is 50 mm/min;
carrying out cantilever beam impact test according to ISO 180/1U, wherein the sample bar size is 80mm multiplied by 10mm multiplied by 4 mm;
bending test is carried out according to GB/T9341-2008, the size of the sample strip is 80mm multiplied by 10mm multiplied by 4 mm;
the thermal conductivity was measured according to ISO22007-2 with sample dimensions of 60mm by 40mm by 2 mm.
The performance test results of the nylon 12/compounded heat-conducting filler special-shaped heat-conducting part material of each example are shown in table 1.
TABLE 1 test results of the material performance of nylon 12/compound heat-conducting filler special-shaped heat-conducting parts of the examples
Figure BDA0003197132320000091
The invention has many applications, and the above description is only a preferred embodiment of the invention. It should be noted that the above examples are only for illustrating the present invention, and are not intended to limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications can be made without departing from the principles of the invention and these modifications are to be considered within the scope of the invention.

Claims (7)

1. The 3D printing molded nylon 12/compound heat-conducting filler special-shaped heat-conducting part is characterized by being prepared through the following steps:
(1) carrying out surface treatment on the heat-conducting filler, and preparing composite powder with uniformly mixed nylon 12, modified heat-conducting filler and sintering aid by adopting a mechanical mixing method;
(2) designing a three-dimensional CAD model, processing the three-dimensional graph to obtain data information of each processing layer, storing the data information as an STL file, and importing the STL file into SLS forming equipment;
(3) setting appropriate molding process parameters such as preheating temperature, laser power, scanning speed, scanning interval, powder laying thickness and the like, and carrying out SLS molding on the nylon 12 composite powder;
(4) and naturally cooling the printed and molded part in a molding cylinder, taking out the printed and molded part after the temperature is reduced to be below 80 ℃, and removing residual powder on the surface through sand blasting post-treatment to obtain the nylon 12/compound heat-conducting filler special-shaped heat-conducting part.
2. The 3D printing molded nylon 12/compound heat-conducting filler special-shaped heat-conducting part according to claim 1, characterized in that the compound heat-conducting filler is mainly alumina and is compounded with other components.
3. The special-shaped heat-conducting part made of nylon 12/compound heat-conducting filler and formed by 3D printing according to claim 2, wherein the other components are one or more of boron nitride, carbon fiber and carbon nanotubes.
4. The special-shaped heat-conducting part made of nylon 12/compound heat-conducting filler and formed by 3D printing according to claim 1, wherein the heat-conducting filler needs to be subjected to certain surface modification.
5. The special-shaped heat-conducting part made of nylon 12/compound heat-conducting filler and formed by 3D printing according to claim 1, wherein the sintering aid is nano-silica and accounts for 1-3% by mass.
6. The special-shaped heat-conducting part made of nylon 12/compound heat-conducting filler and formed by 3D printing according to claim 1, wherein the powder mixing time of the mechanical mixing method is 4-8 h.
7. The nylon 12/compound heat-conducting filler specially-shaped heat-conducting part formed by 3D printing according to claim 1, wherein SLS forming process parameters are as follows: the preheating temperature is 170-173 ℃, the laser power is 40-50W, the laser scanning speed is 8800-10160 mm/s, the scanning interval is 0.15-0.3 mm, and the powder spreading thickness is 0.1-0.2 mm.
CN202110894076.3A 2021-08-05 2021-08-05 3D printing molded nylon 12/compound heat-conducting filler special-shaped heat-conducting part Pending CN113652082A (en)

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