CN109535709B - High molecular polymer powder material and preparation method thereof - Google Patents

High molecular polymer powder material and preparation method thereof Download PDF

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Publication number
CN109535709B
CN109535709B CN201811331785.5A CN201811331785A CN109535709B CN 109535709 B CN109535709 B CN 109535709B CN 201811331785 A CN201811331785 A CN 201811331785A CN 109535709 B CN109535709 B CN 109535709B
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powder
stirring
powder material
carbon black
polymer powder
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CN109535709A (en
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许小曙
文杰斌
李俭
侯帅
苏雪雪
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Hunan Farsoon High Tech Co Ltd
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Hunan Farsoon High Tech Co Ltd
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Priority to EP19881933.6A priority patent/EP3878910A4/en
Priority to PCT/CN2019/111972 priority patent/WO2020093855A1/en
Priority to US17/292,244 priority patent/US20210403714A1/en
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    • C08L77/00—Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Compositions of derivatives of such polymers
    • C08L77/06—Polyamides derived from polyamines and polycarboxylic acids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/02—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type
    • B29B7/06—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29B7/00—Mixing; Kneading
    • B29B7/02—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type
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Abstract

The invention provides a preparation method of a high molecular polymer powder material, which comprises the following steps: adding 10 parts of polymer powder material and 0.1-5 parts of carbon black into a stirring barrel for first high-speed stirring to prepare polymer carbon black mixed powder material; and adding the high-molecular carbon black mixed powder material, 0.1-1 part of flow additive, 5-40 parts of heat medium material and 90 parts of high-molecular powder material into a powder mixing barrel, carrying out high-speed stirring for the second time, and then screening to obtain the high-molecular polymer powder material. The method adopts a high-speed stirring mode to uniformly attach the carbon black to the surfaces of the high polymer powder and the thermal medium, so that the high polymer powder in the prior art is applied to fiber laser sintering, the surface quality of a workpiece is good, the structure is finer, the comprehensive performance is excellent, the tensile modulus is high, and the types and the application fields of fiber laser sintering materials are expanded.

Description

High molecular polymer powder material and preparation method thereof
Technical Field
The invention belongs to the technical field of additive manufacturing, and particularly relates to a high-molecular polymer powder material and a preparation method thereof.
Background
Selective sintering and fusing of multiple powder layers with a laser is a method of manufacturing three-dimensional objects that allows to obtain a three-dimensional entity without using tooling, by laser sintering of multiple superposed layers of powder, only according to a three-dimensional image of the object to be produced. The process is primarily accomplished using thermoplastic polymers. Patents US6136948 and WO9606881 describe in detail such a method of manufacturing three-dimensional objects using powdered polymers.
The main use of the existing mainstream selective laser sintering is CO2And the laser has the wavelength of 10600nm and corresponds to a mid-infrared band. The polyamide powder material in the high molecular polymer has high absorption rate to the wavelength in the range, and other high molecules have poor absorption rate to the wavelength, so that the existing high molecular polymer is difficult to be applied to the selective laser sintering technology.
In CN106626379A patent, a fiber laser is proposed to sinter nylon, which cannot absorb laser energy with a wavelength of 1064nm, and needs a method using a thermal medium to increase the laser absorption rate of nylon powder. Because of the addition of the heat absorbing medium, the heat medium in nylon efficiently absorbs the laser energy and transfers it to the polyamide powder to be fused. The fiber laser can use smaller laser spots, realizes the manufacturing of polyamide three-dimensional objects by using laser with smaller focusing spots, and improves the manufacturing precision. However, if the problem of uniform mixing of the thermal medium and the high molecular polymer cannot be solved, the sintered surface quality and surface are poor, and a fine structure cannot be printed. Meanwhile, the sintering effect is poor in stability due to the uneven mixing of the heat medium. Therefore, it is urgently required to develop a heat absorbing material capable of uniformly mixing a heat medium and a polymer powder material.
Disclosure of Invention
The invention provides a high molecular polymer powder material and a preparation method thereofAccording to the method, the carbon black is distributed on the surfaces of the high-molecular powder material and the thermal medium more uniformly by the stirring process, so that the high-molecular powder material and the thermal medium can absorb visible light emitted by the fiber laser, and the high-molecular polymer composite material workpiece is prepared by sintering the fiber laser with lower power. With the existing CO2The method is different from the method that after the high molecular polymer powder in an irradiation area is irradiated by the laser of the wave band, carbon black on the surface of the high molecular polymer powder absorbs part of the laser energy to obtain higher temperature, and then the energy is transferred to the high molecular polymer powder through heat conduction, so that the fusion of the high molecular polymer powder is realized.
Thus, the nylon resin powder material can not only absorb the energy of the optical fiber laser with visible light wavelength, but also absorb other high molecular polymer powder, such as thermoplastic polyurethane resin powder, polypropylene resin powder, polyethylene resin powder, ethylene-vinyl acetate copolymer resin powder, polyether sulfone resin powder, polyphenylene sulfide resin powder or polyether ether ketone resin powder.
The invention provides a preparation method of a high molecular polymer powder material, which is characterized by comprising the following steps:
adding 10 parts of polymer powder material and 0.1-5 parts of carbon black into a stirring barrel for first high-speed stirring to prepare polymer carbon black mixed powder material;
and adding the high-molecular carbon black mixed powder material, 0.1-1 part of flow additive, 5-40 parts of heat medium material and 90 parts of high-molecular powder material into a powder mixing barrel, carrying out high-speed stirring for the second time, and then screening to obtain the high-molecular polymer powder material.
As a further preferable scheme of the present invention, the specific process parameters of the first high-speed stirring are as follows: the temperature of the stirring barrel is kept at 30-40 ℃, the stirring speed is 1500-2000 r/min, and the stirring time is 0.5-5 min. The smaller the particle size of the carbon black is, the more difficult the carbon black is to disperse and agglomerate if the carbon black is directly and independently dispersed, and the carbon black and the polymer powder material are uniformly mixed and distributed by stirring the carbon black and the polymer powder material at a high speed for the first time.
As a further preferable scheme of the invention, the process of the second high-speed stirring is divided into two stages:
in the first stage, the temperature of a powder mixing barrel is kept at 70-80 ℃, the stirring speed is 1200-1500 r/min, and the stirring time is 1-20 min; by heating and high-speed stirring at the stage, the polymer powder material is uniformly dispersed, static electricity is eliminated, and the coverage rate of the carbon black on the polymer powder and a heat medium is improved.
And in the second stage, the temperature of the powder mixing barrel is kept at 30-40 ℃, the stirring speed is 600-800 r/min, and the stirring time is 3-150 min. Through the environment of relative first stage lower temperature and lower stirring speed, through the stirring mixing of longer time, carbon black, thermal medium mix more evenly with polymer powder material, prevent the friction between the polymer powder material, if under the high-speed environment of high temperature, the easy breakage or the fracture of polymer powder influence the appearance of powder.
In a more preferred embodiment of the present invention, the carbon black has an average particle diameter of 60 to 100 nm. The carbon black has an excessively large particle size and poor adhesion, so that the adhesion of the carbon black on the surface of a high polymer powder material is influenced, the average particle size of the carbon black is limited to be 60-100 nm, and the small-particle nano carbon black has large specific surface force, absorbs more laser energy and has better heat absorption efficiency.
In a further preferred embodiment of the present invention, the heat medium is carbon fiber, iron sesquioxide powder (commonly known as iron red), iron tetraoxide powder (commonly known as iron black), or metal powder.
As a further preferable scheme of the invention, the metal powder is one or more of iron powder, aluminum powder, copper powder, tungsten powder, nickel powder, cobalt powder and titanium powder.
In a more preferred embodiment of the present invention, the coverage of the carbon black on the surface of the polymer powder is 20 to 200%, and the coverage of the carbon black on the surface of the heat medium is 30 to 300%.
In a more preferred embodiment of the present invention, the average particle diameter of the heat medium is 10 to 45 μm
In a more preferred embodiment of the present invention, the polymer powder has an average particle diameter of 40 to 75 μm. The high molecular polymer powder material has good powder fluidity in the particle size range, and can ensure that the carbon black and the heat medium are uniformly distributed on the surface of the high molecular powder. The carbon black is easy to agglomerate due to too small particle size of the high-molecular polymer powder material, so that the mechanical property of a prepared sintered powder product is influenced; the large particle size of the polymer powder material tends to result in a low coverage of carbon black and a low laser energy absorption efficiency.
In a more preferred embodiment of the present invention, the polymer powder material is nylon resin powder, thermoplastic polyurethane resin powder, polypropylene resin powder, polyethylene resin powder, ethylene-vinyl acetate copolymer resin powder, polyether sulfone resin powder, polyphenylene sulfide resin powder, or polyether ether ketone resin powder. The polyamide powder material in the high molecular polymer has higher absorption rate to the wavelength in the range, and other high molecules have poor absorption rate to the wavelength, so that the existing high molecular polymer is difficult to be applied to the selective laser sintering technology.
In a further preferred embodiment of the present invention, the nylon resin powder is one or more selected from PA6, PA11, PA12, PA66, PA610, PA612, PA1010, PA1012, and PA 1212.
As a further preferable scheme of the invention, the flow assistant is fumed silica, fumed alumina or nano titanium dioxide.
The invention also provides a high molecular polymer powder material, which is prepared by the preparation method of the high molecular polymer powder material and is suitable for sintering the optical fiber laser.
In a further preferable scheme of the invention, the laser power of the optical fiber laser is 30-1000W, the laser spot size is 30-1500 μm, and the laser scanning speed is 10-30 m/s.
The invention provides a high molecular polymer powder material and a preparation method thereof, which have the following beneficial effects:
(1) by the high-speed stirring process, the carbon black, the heat medium and the high-molecular polymer powder are uniformly dispersed, the carbon black agglomeration is prevented, the fluidity of the nylon polymer powder is further improved, and the coverage rate of the carbon black on the surface of the nylon powder material is extremely high.
(2) By adding the thermal medium and the carbon black, the high molecular polymer powder which can not absorb the energy of the laser in the prior art can easily absorb the energy of the laser, the fiber laser can be better used for sintering and preparing workpieces, and the material application variety and the application range of the technology are enlarged.
(3) The addition of the heat medium can absorb the laser energy with visible light wavelength to better melt the powder, and meanwhile, the heat medium plays a role in enhancing, so that the mechanical strength and modulus of the high-molecular polymer material are improved, and meanwhile, the impact resistance of the high-molecular polymer powder material is better.
Detailed Description
Comparative example 1
(1) 100 parts of nylon 1212 powder having an average particle size of 60 μm, 1 part of fumed silica, 20 parts of carbon fiber having an average particle size of 40 μm and 1 part of carbon black having an average particle size of 80nm were stirred and mixed to obtain a nylon 1212 powder which was selectively laser-sintered.
Example 1
(1) Adding 10 parts of nylon 1212 powder with the average particle size of 60 mu m and 1 part of carbon black with the average particle size of 60nm into a stirring barrel, stirring, keeping the temperature of the stirring barrel at 30 ℃, stirring at the speed of 2000r/min, and stirring for 0.5min to prepare nylon 1212 carbon black mixed powder;
(2) adding 10 parts of nylon 1212 carbon black mixed powder, 1 part of fumed silica, 20 parts of carbon fiber with the average particle size of 40 mu m and 90 parts of nylon 1212 powder into a powder mixing barrel, adopting a high-speed stirring process and then screening, wherein the average particle size is 60 mu m, carrying out high-speed stirring for the first stage, keeping the temperature of the powder mixing barrel at 70 ℃, and stirring at the speed of 1500r/min for 2 min; and (3) stirring at a high speed for a second stage, wherein the temperature of the powder mixing barrel is kept at 40 ℃, the stirring speed is 800r/min, and the stirring time is 3min, so that the nylon 1212 polymer powder material is obtained.
The prepared nylon 1212 polymer powder material was sintered using a fiber laser to produce a sintered workpiece sample bar and tested for properties, the results of which are shown in table 1.
Example 2
(1) The total mass part of the nylon 6 powder and the carbon black is 100 parts, 5 parts of the nylon 6 powder with the average particle size of 40nm and 0.1 part of the carbon black with the average particle size of 60 are added into a stirring barrel to be stirred, the temperature of the stirring barrel is kept at 32 ℃, the stirring speed is 1600r/min, and the stirring time is 1min, so that the nylon 6 carbon black mixed powder is prepared;
(2) adding 10 parts of nylon 6 carbon black mixed powder, 0.1 part of gas-phase titanium dioxide, 5 parts of ferric oxide powder with the average particle size of 10 mu m and 90 parts of nylon 6 powder into a powder mixing barrel, adopting a high-speed stirring process and then screening, wherein the average particle size is 40 mu m, and stirring at a high speed for a first stage, wherein the temperature of the powder mixing barrel is kept at 72 ℃, the stirring speed is 1300r/min, and the stirring time is 3 min; and (3) in the second stage of high-speed stirring, keeping the temperature of the powder mixing barrel at 33 ℃, stirring at 640r/min for 5min to obtain the nylon 6 polymer powder material.
The prepared nylon 6 polymer powder material was sintered using a fiber laser to produce a sintered workpiece sample bar and tested for properties, the results of which are shown in table 1.
Example 3
(1) Adding 20 parts of thermoplastic polyurethane powder with the average particle size of 40 mu m and 0.1 part of carbon black with the average particle size of 65nm into a stirring barrel, stirring, keeping the temperature of the stirring barrel at 40 ℃, stirring at the speed of 1500r/min for 2min, and preparing thermoplastic polyurethane carbon black mixed powder;
(2) adding 20 parts of thermoplastic polyurethane carbon black mixed powder, 0.1 part of gas-phase aluminum oxide, 10 parts of ferroferric oxide powder with the average particle size of 15 mu m and 80 parts of thermoplastic polyurethane powder into a powder mixing barrel, adopting a high-speed stirring process and then sieving, wherein the average particle size is 40 mu m, and in the first high-speed stirring stage, the temperature of the powder mixing barrel is kept at 80 ℃, the stirring speed is 1200 r/min, and the stirring time is 5 min; and (3) in the second stage of high-speed stirring, keeping the temperature of the powder mixing barrel at 30 ℃, stirring at 800 rpm for 15min, and thus obtaining the thermoplastic polyurethane polymer powder material.
Sintering the prepared thermoplastic polyurethane polymer powder material by using a fiber laser to prepare a sintered workpiece sample strip and carrying out performance test, wherein the results are shown in table 1.
Example 4
(1) Adding 20 parts of polypropylene resin powder with the average particle size of 45 mu m and 0.5 part of carbon black with the average particle size of 70nm into a stirring barrel, stirring, keeping the temperature of the stirring barrel at 35 ℃, stirring at the speed of 1600r/min, and stirring for 2min to obtain polypropylene resin carbon black mixed powder;
(2) adding 20 parts of polypropylene resin carbon black mixed powder, 0.2 part of fumed silica, 15 parts of iron powder with the average particle size of 20 micrometers and 80 parts of polypropylene resin powder into a powder mixing barrel, adopting a high-speed stirring process and then screening, wherein the average particle size is 45 micrometers, and performing high-speed stirring for the first stage, wherein the temperature of the powder mixing barrel is kept at 70 ℃, the stirring speed is 1300 revolutions per minute, and the stirring time is 8 minutes; and in the second stage of high-speed stirring, the temperature of the powder mixing barrel is kept at 35 ℃, the stirring speed is 760 revolutions per minute, and the stirring time is 30 minutes, so that the polypropylene resin polymer powder material is obtained.
Sintering the prepared polypropylene resin polymer powder material by using a fiber laser to prepare a sintered workpiece sample strip and carrying out performance test, wherein the results are shown in table 1.
Example 5
(1) Adding 20 parts of polyethylene resin powder with the average particle size of 50 mu m and 1 part of carbon black with the average particle size of 75nm into a stirring barrel, stirring, keeping the temperature of the stirring barrel at 36 ℃, stirring at the speed of 1700r/min, and stirring for 3min to obtain polyethylene resin carbon black mixed powder;
(2) adding 20 parts of polyethylene resin carbon black mixed powder, 0.3 part of fumed silica, 20 parts of copper powder with the average particle size of 25 mu m and 80 parts of polyethylene resin powder into a powder mixing barrel, adopting a high-speed stirring process and then screening, wherein the average particle size is 50 mu m, and stirring at a high speed for a first stage, wherein the temperature of the powder mixing barrel is kept at 80 ℃, the stirring speed is 1200 r/min, and the stirring time is 10 min; and in the second stage of high-speed stirring, the temperature of the powder mixing barrel is kept at 30 ℃, the stirring speed is 800 revolutions per minute, and the stirring time is 45 minutes, so that the polyethylene resin polymer powder material is obtained.
Sintering the prepared polyethylene resin polymer powder material by using a fiber laser to prepare a sintered workpiece sample strip and carrying out performance test, wherein the results are shown in table 1.
Example 6
(1) Adding 20 parts of polyether sulfone resin powder with the average particle size of 65 mu m and 3 parts of carbon black with the average particle size of 90nm into a stirring barrel, stirring, keeping the temperature of the stirring barrel at 40 ℃, stirring at the speed of 1900r/min for 4min, and preparing polyether sulfone resin carbon black mixed powder;
(2) adding 20 parts of polyether sulfone resin carbon black mixed powder, 0.1 part of fumed silica, 25 parts of nickel powder with the average particle size of 30 micrometers and 80 parts of polyether sulfone resin powder into a powder mixing barrel, adopting a high-speed stirring process and then screening, wherein the average particle size is 650 micrometers, stirring at a high speed for a first stage, keeping the temperature of the powder mixing barrel at 80 ℃, stirring at the speed of 1200 revolutions per minute and stirring for 14 minutes; and in the second stage of high-speed stirring, the temperature of the powder mixing barrel is kept at 30 ℃, the stirring speed is 800 revolutions per minute, and the stirring time is 60 minutes, so that the polyether sulfone resin polymer powder material is obtained.
Sintering the prepared polyether sulfone resin powder material by using a fiber laser to prepare a sintered workpiece sample strip and carrying out performance test, wherein the results are shown in table 1.
Example 7
(1) Adding 20 parts of polyphenylene sulfide resin powder with the average particle size of 70 mu m and 5 parts of carbon black with the average particle size of 100nm into a stirring barrel, stirring, keeping the temperature of the stirring barrel at 40 ℃, stirring at the speed of 2000r/min, and stirring for 5min to prepare polyphenylene sulfide resin carbon black mixed powder;
(2) adding 20 parts of polyphenylene sulfide resin carbon black mixed powder, 1 part of fumed silica, 30 parts of cobalt powder with the average particle size of 35 mu m and 80 parts of polyphenylene sulfide resin powder into a powder mixing barrel, adopting a high-speed stirring process, screening, wherein the average particle size is 70 mu m, and carrying out high-speed stirring in a first stage, wherein the temperature of the powder mixing barrel is kept at 75 ℃, the stirring speed is 1200 r/min, and the stirring time is 18 min; and in the second stage of high-speed stirring, the temperature of the powder mixing barrel is kept at 40 ℃, the stirring speed is 600 revolutions per minute, and the stirring time is 100 minutes, so that the polyphenylene sulfide resin powder material is obtained.
Sintering the prepared polyphenylene sulfide resin powder material by using a fiber laser to prepare a sintered workpiece sample strip and carrying out performance test, wherein the results are shown in table 1.
Example 8
(1) Adding 20 parts of polyether-ether-ketone resin powder with the average particle size of 75 mu m and 3 parts of carbon black with the average particle size of 100nm into a stirring barrel, stirring, keeping the temperature of the stirring barrel at 30 ℃, stirring at the speed of 2000r/min, and stirring for 5min to obtain polyether-ether-ketone resin carbon black mixed powder;
(2) adding 20 parts of polyether-ether-ketone resin carbon black mixed powder, 0.1 part of fumed silica, 40 parts of tungsten powder with the average particle size of 45 mu m and 80 parts of thermoplastic polyether-ether-ketone resin powder into a powder mixing barrel, adopting a high-speed stirring process and then screening, wherein the average particle size is 75 mu m, stirring at a high speed for the first stage, keeping the temperature of the powder mixing barrel at 80 ℃, stirring at 1400 revolutions per minute and stirring for 20 minutes; and (3) in the second stage of high-speed stirring, keeping the temperature of the powder mixing barrel at 35 ℃, stirring at 700r/min for 150min to obtain the polyether-ether-ketone resin polymer powder material.
Sintering the prepared polyether-ether-ketone resin powder material by adopting a fiber laser to prepare a sintered workpiece sample strip and carrying out performance test, wherein the results are shown in table 1.
Table 1: the performance parameters of the three-dimensional part prepared by the high molecular polymer powder material are adopted.
Figure DEST_PATH_IMAGE001
By the stirring process, the carbon black and the high molecular polymer powder are uniformly dispersed, the carbon black is prevented from agglomerating, the carbon black is uniformly coated on the surface of the polyamide powder, and the carbon black has high efficiency on absorbing laser energy of the optical fiber.
By adding the thermal medium and the carbon black, the high molecular polymer powder which can not absorb the energy of the laser in the prior art can easily absorb the energy of the laser, the fiber laser can be better used for sintering and preparing workpieces, and the material application variety and the application range of the technology are enlarged. The addition of the heat medium can absorb laser energy with visible light wavelength to better melt the powder, and meanwhile, the heat medium plays a role in enhancing, so that the mechanical strength and modulus of the high polymer material are improved, and the impact resistance of the high polymer is better.
By adding the carbon black, the high molecular polymer powder which can not absorb the energy of the laser in the prior art can easily absorb the energy of the laser, the fiber laser can be well used for sintering and preparing workpieces, the material application types and the application range of the technology are enlarged, in the embodiment of the invention, the laser power of the fiber laser is preferably 100-300W, the laser spot is 40-60 mu m, and the laser is controlled to irradiate the cross section area of the three-dimensional part at the speed of about 10-25 m/s. After the fusion of one layer under the irradiation of laser is finished, the powder spreader spreads the mixed powder of polyamide and carbon fiber on the working plane to a thickness of 0.1mm, and the laser continues to irradiate the cross section area of the three-dimensional part on the new powder layer. The above procedure was repeated until a three-dimensional part made of high molecular polymer powder material was obtained, which was found to be comparable to the use of CO2Laser, three-dimensional parts perform better at features.

Claims (9)

1. A method for preparing a high molecular polymer powder material is characterized by comprising the following steps:
(1) adding 10 parts of polymer powder material and 0.1-5 parts of carbon black into a stirring barrel for first high-speed stirring to prepare a polymer carbon black mixed powder material, wherein the specific technological parameters of the first high-speed stirring are as follows: the temperature of the stirring barrel is kept at 30-40 ℃, the stirring speed is 1500-2000 r/min, the stirring time is 0.5-5 min, and the average particle size of the carbon black is 60-100 nm;
(2) adding the high-molecular carbon black mixed powder material, 0.1-1 part of flow additive, 5-40 parts of heat medium material and 90 parts of high-molecular powder material into a powder mixing barrel, carrying out high-speed stirring for the second time, and then screening to obtain the high-molecular polymer powder material, wherein the process of the high-speed stirring for the second time is divided into two stages: in the first stage, the temperature of a powder mixing barrel is kept at 70-80 ℃, the stirring speed is 1200-1500 r/min, and the stirring time is 1-20 min; and in the second stage, the temperature of the powder mixing barrel is kept at 30-40 ℃, the stirring speed is 600-800 r/min, and the stirring time is 3-150 min.
2. The method according to claim 1, wherein the heat medium is carbon fiber, iron sesquioxide powder, iron ferroferric oxide powder, or metal powder.
3. A method for producing a polymer powder material according to claim 2, wherein the coverage of the carbon black on the surface of the polymer powder is 20 to 200%, and the coverage of the carbon black on the surface of the heat medium is 30 to 300%.
4. The method for producing a high molecular weight polymer powder material according to claim 3, wherein the average particle diameter of the heat medium material is 10 to 45 μm.
5. The method for producing a polymer powder material according to claim 4, wherein the polymer powder material has an average particle diameter of 40 to 75 μm.
6. The method for preparing a high molecular weight polymer powder material according to claim 5, wherein the high molecular weight polymer powder material is nylon resin powder, thermoplastic polyurethane resin powder, polypropylene resin powder, polyethylene resin powder, ethylene-vinyl acetate copolymer resin powder, polyethersulfone resin powder, polyphenylene sulfide resin powder or polyetheretherketone resin powder.
7. The method for preparing high molecular polymer powder material according to claim 6, wherein the nylon resin powder is one or more of PA6, PA11, PA12, PA66, PA610, PA612, PA1010, PA1012 and PA 1212.
8. A high molecular weight polymer powder material produced by the method for producing a high molecular weight polymer powder material according to any one of claims 1 to 7, which is suitable for sintering a fiber laser.
9. The high molecular weight polymer powder material according to claim 8, wherein the laser power of the fiber laser is 30 to 1000W, the laser spot size is 30 to 1500 μm, and the laser scanning speed is 10 to 30 m/s.
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