CN117264509A - Thermosetting powder coating of 3D printing material and preparation method thereof - Google Patents
Thermosetting powder coating of 3D printing material and preparation method thereof Download PDFInfo
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- CN117264509A CN117264509A CN202311217742.5A CN202311217742A CN117264509A CN 117264509 A CN117264509 A CN 117264509A CN 202311217742 A CN202311217742 A CN 202311217742A CN 117264509 A CN117264509 A CN 117264509A
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- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims description 2
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- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 2
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 claims description 2
- 239000002985 plastic film Substances 0.000 claims description 2
- 229920006255 plastic film Polymers 0.000 claims description 2
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims description 2
- RIOQSEWOXXDEQQ-UHFFFAOYSA-N triphenylphosphine Chemical class C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1 RIOQSEWOXXDEQQ-UHFFFAOYSA-N 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
-
- 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
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/03—Powdery paints
- C09D5/033—Powdery paints characterised by the additives
-
- 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
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
-
- 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
- C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
- C08K2003/3045—Sulfates
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Ceramic Engineering (AREA)
- Civil Engineering (AREA)
- Composite Materials (AREA)
- Structural Engineering (AREA)
- Manufacturing & Machinery (AREA)
Abstract
The invention discloses a thermosetting powder coating of a 3D printing material and a preparation method thereof, wherein the formula of the coating is as follows: 50-70 parts of composite polyester resin A; 3 to 10 parts of curing agent, 5 to 15 parts of flexibilizer and 5 to 20 parts of other auxiliary agents. The preparation method comprises the steps of uniformly mixing the polyester resin A and the modified catalyst, then carrying out high-temperature melt extrusion by a double-screw extruder, cooling and tabletting to normal temperature, and crushing to obtain the modified polyester resin A; and putting the modified polyester resin A, the curing agent, the flexibilizer and other additives into a premixing cylinder, uniformly mixing, then carrying out low-temperature melt extrusion through a single screw extruder, cooling and tabletting to normal temperature, finally crushing and grading through a low-speed crusher to prepare powder particles with the particle size of 150-200 mu m, and plasticizing and molding the powder particles again to prepare the 3D printing wire. The wire is low in price, excellent in toughness and durable, the colors can be customized at will, and the application field of 3D printing is greatly widened.
Description
Technical Field
The invention belongs to the technical field of powder coatings, and particularly relates to a thermosetting powder coating of a 3D printing material and a preparation method thereof.
Background
The 3D printing technology is to stack and bond special materials such as metal powder, ceramic powder, plastic, cell tissues and the like layer by using a computer three-dimensional design model as a blue book, and using a software layered discrete and numerical control forming system in a laser beam, a hot melting nozzle and the like mode, and finally, to stack and form a solid product. Different from the traditional manufacturing industry that the raw materials are shaped and cut in a mechanical processing mode such as a die, a turning milling mode and the like to finally produce a finished product, the three-dimensional entity is changed into a plurality of two-dimensional planes through 3D printing, and the manufacturing complexity is greatly reduced through material processing and layer-by-layer stacking production. The digital manufacturing mode can directly generate parts with any shape from the computer graphic data without complex process, huge machine tool and numerous manpower, so that the production and manufacturing can be extended to a wider production crowd range.
The 3D printing technology mainly comprises the following steps: fused Deposition Modeling (FDM), stereolithography (SLA), selective Laser Sintering (SLS), etc., with FDM fused deposition modeling being the most widely used, the application of thermosetting powder coatings to new material inventions for 3D Fused Deposition Modeling (FDM) is primarily discussed herein. Fused Deposition Modeling (FDM) is a technique in which a material is melted at a high temperature to a molten state, and then small spherical particles are extruded through a nozzle, and these particles solidify immediately after being ejected, and a physical object is formed by the arrangement and combination of these particles in a three-dimensional space. The representative wires of the technology are PLA, ABS and the like, and the technology has high molding precision, good physical strength and color molding, but the cost of the wires is relatively high, and the molded wires have rough surfaces mainly because of the large molecular weight of the PLA, ABS and the like and high melt viscosity. Wire price and surface roughness issues limit the development of Fused Deposition Modeling (FDM) technology in the field of 3D proofing.
In the 21 st century, powder paint and coating are used to save resources and energy, and features no pollution, high productivity and easy automatic coating. The powder coating is a 4E coating product which meets the requirements of high production efficiency, excellent coating performance, ecological environmental protection and economy and is the fastest coating in the environment-friendly coating variety, the invention solves the problems of high price and rough surface of the wire rod of the Fused Deposition Modeling (FDM) technology in the cross-industry, and provides a novel printing material with lower price, smoother surface, richer color and better toughness and durability for the 3D printing industry.
Disclosure of Invention
In order to solve the defects existing in the Fused Deposition Modeling (FDM) technology in the 3D printing industry, the primary purpose of the invention is to provide a thermosetting powder coating applied to 3D printing materials, which can greatly reduce the price of wires, and improve the smoothness of the surface of a printed part, has more abundant colors and better toughness and durability, thereby being capable of promoting the large-scale use in the 3D printing industry.
Another object of the present invention is to provide a method for preparing the thermosetting powder coating of 3D printing material.
It is a final object of the present invention to provide the use of a thermosetting powder coating for a 3D printing material as described above.
The invention is realized by the following technical scheme:
the thermosetting powder coating for the 3D printing material comprises the following components in parts by weight:
wherein, the modified polyester resin A comprises the following components in parts by weight:
90-100 parts of polyester resin A;
2-10 parts of modified catalyst;
the acid value of the polyester resin A is 70-90 mgKOH/g; the particle size of the modified polyester resin A is 20-25 um.
The acid value of the polyester resin A is 70-90 mgKOH/g, and the too low acid value can cause the final reaction speed of the system to be too slow, so that the coating wire is incompletely cured within X4 seconds at 200 ℃ to influence the product performance; the particle size of the modified polyester resin A is 20-25 um, and if the particle size is larger than 25um, the dispersion of the modified polyester resin A in the extrusion of the subsequent process is affected, and the coating is insufficiently cured within 200 ℃ multiplied by 5 seconds, so that the product performance is affected.
Preferably, the curing agent is one or a mixture of two of triglycidyl isocyanurate and hydroxyalkylamide.
Preferably, the flexibilizer is one or a mixture of two of phthalate, polybutadiene elastomer, polyamide and the like;
preferably, the modified catalyst is selected from one or a mixture of more of modified 2-methylimidazole, modified 2-phenylimidazoline or modified triphenylphosphine. The modified catalyst is prepared by micronizing the procatalyst and diluting with fumed silica by means conventional in the art.
Preferably, the polyester resin A is carboxyl-terminated polyester resin, and the acid value of the polyester resin A is 70-90 mgKOH/g; the molecular weight of the polyester resin A is 2500-4000; the particle size of the modified polyester resin A is 20-25 um.
The modified catalyst can reduce the reaction temperature of the coating, but the reduction is smaller, generally at most about 20 ℃, in the scheme, the modified catalyst and polyester resin are firstly melted, mixed and sheared under the high-temperature condition, so that the modified catalyst is highly activated, and meanwhile, the modified catalyst is more uniformly dispersed with the polyester, and the activity of the modified catalyst is further improved after secondary low-temperature melt extrusion, so that the curing temperature can be greatly reduced.
According to the invention, the research shows that the matching proportion of the polyester resin A and the modifying catalyst has a great influence on the performance of the coating, and when the dosage of the polyester resin A is excessive, the coating is incompletely cured, and the physical performance is obviously deteriorated; the polyester resin A is too little, and the catalyst activity is too high, so that chemical reaction can easily occur during secondary extrusion to partially gel the coating, and the performance is influenced. Therefore, it is preferable that the mass ratio of the polyester resin a to the modifying catalyst is 10:1 to 45:1.
according to actual needs, since cooling, slitting and cutting are needed after the later-stage powder plasticization, the wire is small in molecular weight and not solidified, the cutting and winding can lead to wire breakage, and the formula needs to be added with a flexible agent to enhance the toughness in cooling and cutting, so that breakage is avoided. The flexible agent is selected from one or more of the following: the flexible agent is one or a mixture of two of phthalate, polybutadiene elastomer, polyamide and the like.
The thermosetting powder coating of the 3D printing material of the invention is added with other auxiliary agents which are selected from one or more of the following: leveling agent, defoamer, brightening agent and pigment filler. The amount of the additive is added appropriately according to the actual situation.
The leveling agent is one or a mixture of more of polyacrylate, silicon-containing acrylate or hydrogenated castor oil;
the defoaming agent is one or two of benzoin or dimethyl polysiloxane;
the brightening agent is one or a mixture of a plurality of acrylic ester copolymers or silicon-containing acrylic ester copolymers.
The pigment filler is one or a mixture of a plurality of barium sulfate or calcium carbonate, titanium dioxide or ferric oxide.
A preparation method of a thermosetting powder coating of a 3D printing material comprises the following steps:
a. uniformly mixing the polyester resin A and the modified catalyst, performing high-temperature melt extrusion by a double-screw extruder, tabletting, cooling to normal temperature, and crushing to obtain modified polyester resin A;
b. the modified polyester resin A, the curing agent, the flexibilizer and other auxiliary agents are put into a premixing cylinder according to a certain proportion, are evenly mixed, are subjected to low-temperature melting extrusion by a single screw extruder, are pressed into tablets, cooled to normal temperature, and are crushed and graded by a high-speed crusher to prepare powder particles with the particle size of 150-200 mu m, so that a semi-finished product is obtained.
Preferably, in step a, the twin screw extruder melt extrusion temperature is 180℃to 200 ℃.
Preferably, in step b, the single screw extruder melt extrusion temperature is from 70℃to 90 ℃.
The preparation process of the invention adopts the steps of preparing the modified polyester resin A firstly, and then melting and extruding the modified polyester resin A and other components, so that the activity of the modified catalyst is greatly improved, and finally, the extremely rapid solidification at 200 ℃ for X4 seconds can be realized.
As bookFurther technical proposal of the invention, the invention also providesPreparation method of thermosetting powder coating of 3D printing material：And (3) feeding the semi-finished powder particles into a plasticizing machine, and plasticizing the semi-finished powder particles at the temperature of 70-80 ℃. In this process, the plasticized dope is pressed by a roller to form a continuous wire on a smooth plastic film, and the wire is flowed into a water tank to be cooled until the wire becomes hard. And then, the wire rod is fed into an automatic cutting machine, and is cut according to the required length and size, so that a wire rod finished product is obtained.
As a further technical scheme of the invention, the thermosetting powder coating is applied to prepare the 3D printing wire, the wire can be rapidly solidified and formed at the nozzle temperature of 200 ℃ during printing, and the wire can be widely applied to the fields of industrial design, cultural and artistic, mechanical manufacturing (automobiles and motorcycles), aerospace, military, construction, film and television, household appliances, light industry, medicine, archaeology, engraving, jewelry and the like through a Fused Deposition Manufacturing (FDM) process. The wire rod made of the thermosetting powder coating provides the advantages of lower price, smoother surface, richer color and better toughness and durability for the 3D printing industry.
Compared with the existing 3D printing material technology, the invention has the following beneficial effects:
1) The invention relates to the technology in the field of powder coating, the coating is very mature, the cost of raw materials is very low, so the unit price of the finished wire is very low, and the price of the wire is only 1/3 of the price of the traditional wire such as PLA, ABS and the like. From the cost perspective, the method is very beneficial to popularization and development of the 3D industrial market;
2) The thermosetting powder polyester resin used in the invention has the molecular weight of 2500-4000, the viscosity of the wire is very low when the wire is in melt printing, and the surface of the printed product is smoother and smoother than that of the traditional wire PLA and ABS;
3) The invention belongs to the field of powder coating, the color of the powder coating can be customized and personalized according to the needs of consumers, the color mixing process is very convenient, and the color range is wider than that of PLA and ABS;
4) The invention relates to a thermosetting powder coating wire, which is solidified and formed in 4 seconds after being sprayed out through a nozzle at 200 ℃ in the 3D printing process, the toughness, strength and ageing resistance of a finished product are greatly enhanced compared with those of degradable plastic PLA and engineering plastic ABS, and the application field of 3D printing is definitely enlarged.
5) The preparation method of the invention is simple, the use is convenient, and the powder coating wire product is green and pollution-free.
Detailed Description
Examples are given below to describe the present invention in detail, but are not limited thereto.
The raw materials used in the examples and comparative examples are now described as follows, but are not limited to these materials:
polyester resin a: the acid value is 70-90 mgKOH/g, and the acid value is from commercial market;
modified catalyst: commercial purchase;
a pliable agent: commercial purchase;
the curing agent is hydroxyalkylamide which is from commercial market;
the leveling agent is polyacrylate and is commercially available;
the defoamer is benzoin and is commercially available;
the brightening agent is an acrylic ester copolymer and is from commercial sources;
the pigment and filler is barium sulfate and titanium dioxide, and is commercially available.
Examples 1-6 and comparative examples 1-4:
a. uniformly mixing the polyester resin A and the modified catalyst according to the proportion in the table 1, and then carrying out high-temperature melt extrusion by a double-screw extruder, wherein the melt extrusion temperature of the double-screw extruder is 190 ℃, tabletting and cooling to normal temperature, and crushing to obtain the modified polyester resin A with the particle size of 20-25 um;
b. putting the composite polyester resin A, the curing agent, the flexibilizer, the flatting agent, the defoamer, the brightening agent and the pigment and filler into a premixing cylinder according to the proportion of the table 2, evenly mixing, carrying out low-temperature melt extrusion by a single-screw extruder, carrying out melt extrusion at 80 ℃, tabletting, cooling to normal temperature, and finally crushing and grading by a high-speed crusher to prepare powder particles with the particle size of 150-200um, thus obtaining a semi-finished product.
Example 7:
the modified polyester resin A having a particle diameter of 50um to 60um was obtained by crushing, and the same procedure as in example 1 was followed.
Comparative example 5:
the polyester resin A, the modified catalyst, the flexibilizer, the curing agent, the leveling agent, the defoamer, the brightening agent and the pigment and filler are put into a premixing cylinder to be uniformly mixed, and are dispersed by a dispersing machine after being ground to prepare powder with the particle size of 150-200um, thus obtaining a semi-finished product, and the content of each component is the same as that of the embodiment 1.
Application example 1
The powder obtained by the preparation method is sprayed on a tin plate through an electrostatic gun, and is melted and solidified to form a film under the baking condition of 200 ℃ for X4 seconds, the dry film thickness is 60-80 mu m, and the performances of the coating, such as impact resistance, pencil hardness, adhesive force, bending resistance, artificial aging resistance, gelation time and the like, are detected, and specific detection standards and results are shown in table 3.
Table 1: composition of modified polyester resin A (parts by weight)
Table 2 specific proportions (parts by weight) of the components in each example and comparative example
TABLE 3 Performance test data for samples of examples and comparative examples
As is clear from the results in Table 3, the thermosetting powders applied to 3D printing materials of examples 1 to 6 have good impact resistance, pencil hardness, adhesion, bending resistance, artificial aging resistance, etc. under curing conditions of 200 ℃ X5 seconds. However, as is clear from comparative examples 1 and 2, the particle size of the modified polyester resin a has a significant effect on various performance indexes of the powder coating, specifically, the particle size of comparative example 1 is larger, the reactivity is insufficient to cause the gelation time to be too long during curing, the coating is incompletely cured under the condition of 200 ℃ x 5 seconds, the artificial aging resistance is relatively poor, and the durability of the 3D printed sample is affected; the comparative example 2 has a smaller particle size and too strong reactivity, resulting in that part of the reaction in the production process causes the coating to be brittle, the physical properties to be poor, and the strength of the final 3D printing model to be insufficient.
From comparative examples 3 and 4, it is known that the acid value of the polyester resin A has a significant influence on various performance indexes of the powder coating, specifically, the acid value of comparative example 3 is smaller, the crosslinking density is too small when the coating is cured, and the comprehensive mechanical properties are poor; the acid value of comparative example 4 was large, and the crosslinking density was too high upon curing, so that the coating flexibility was deteriorated. None is the best option for 3D printing new wire.
As is clear from examples 1 and 5, the present invention can reduce the curing temperature to an extremely low level by melt-kneading and shearing the polyester resin A and the modifying catalyst at a high temperature to primarily activate the modifying catalyst and disperse the modifying catalyst more uniformly with the polyester, and further improving the activity of the modifying catalyst after the secondary melt-low-temperature extrusion.
As is clear from examples 1 and 7, when the particle diameter of the modified polyester resin A is 60um to 70um, the system is not sufficiently cured, and the overall properties are not optimal.
The thermosetting powder applied to the 3D printing material can be widely applied to the 3D printing fields of industrial design, cultural arts, mechanical manufacturing (automobiles and motorcycles), aerospace, military, construction, film and television, household appliances, light industry, medicine, archaeology, carving, jewelry and the like.
Application example 2
Preferably, in combination with the 3D printing fused deposition Fabrication (FDM) technology process in example 2, since the cooling time from high temperature extrusion coating to covering to model surface layer is 3-5 seconds, the curing time is fixed at 3-5 seconds, and then the 3D printing technology conditions with the best performance and capable of continuous batch production are finally screened out by baking at different temperatures:
table 4 example 2 performance test data under different curing conditions
As shown by the experimental results in Table 4, the thermosetting powder applied to the 3D printing material is incompletely cured at the temperature of below 195 ℃ for 4 seconds, and has poor comprehensive properties, which is not the optimal scheme; the printer nozzle can be completely cured at the temperature of more than 205 ℃ (4 seconds), the performance is good in all aspects, but the printer nozzle is blocked by the paint cured in advance during actual printing due to the too fast reaction, and the barely printed part can not be well adhered to a hot bed due to the premature curing, so that the edge of the model is warped, and the use requirement can not be met. Therefore, the optimal curing temperature is 200 ℃ (4 seconds), the perfect combination of the comprehensive performance and the actual printing process is achieved, the curing is carried out at 200 ℃ for 4 seconds, the comprehensive physical, chemical and artificial aging resistance performances are excellent, the printing temperature range is 195-205 ℃, the setting temperature is 200 ℃, the process requirements of 3D printing can be completely met, and the method is suitable for large-scale popularization and application.
Claims (10)
1. The thermosetting powder coating for the 3D printing material is characterized by comprising the following components in parts by weight:
wherein, the modified polyester resin A comprises the following components in parts by weight:
90-100 parts of polyester resin A;
2-10 parts of modified catalyst;
the acid value of the polyester resin A is 70-90 mgKOH/g; the particle size of the modified polyester resin A is 20-25 um.
2. The thermosetting powder coating of a 3D printing material according to claim 1, wherein the curing agent is one or a mixture of two of triglycidyl isocyanurate or hydroxyalkylamide; the modified catalyst is selected from one or a mixture of more of modified 2-methylimidazole, modified 2-phenylimidazoline and modified triphenylphosphine.
3. The thermosetting powder coating of a 3D printing material according to claim 1, wherein the mass ratio of the polyester resin a to the modifying catalyst is 10:1 to 45:1.
4. the thermosetting powder coating for 3D printing material according to claim 1, wherein the polyester resin a is a carboxyl-terminated polyester resin having an acid value of 70 to 90mgKOH/g; the molecular weight of the polyester resin A is 2500-4000; the particle size of the modified polyester resin A is 20-25 um.
5. The thermosetting powder coating for 3D printing material according to claim 1, wherein the pliable agent is one or a mixture of two of phthalate, polybutadiene elastomer, polyamide.
6. The thermosetting powder coating for 3D printing material according to claim 1, wherein the other auxiliary agent is selected from one or several of the following: leveling agent, defoamer, brightening agent and pigment filler.
7. The thermosetting powder coating of 3D printing material according to claim 6, wherein the leveling agent is one or a mixture of several of polyacrylate, silicon-containing acrylate or hydrogenated castor oil; the defoaming agent is one or two of benzoin or dimethyl polysiloxane; the brightening agent is one or a mixture of a plurality of acrylic ester copolymers or silicon-containing acrylic ester copolymers; the pigment filler is one or a mixture of a plurality of barium sulfate or calcium carbonate, titanium dioxide or ferric oxide.
8. A method of preparing a thermosetting powder coating for 3D printing material according to any one of claims 1-7, comprising the steps of:
a. uniformly mixing the polyester resin A and the modified catalyst, performing high-temperature melt extrusion by a double-screw extruder, tabletting, cooling to normal temperature, and crushing to obtain modified polyester resin A;
b. uniformly mixing the modified polyester resin A, the curing agent, the toughening agent and other auxiliary agents according to a proportion, performing low-temperature melt extrusion by a single screw extruder, tabletting, cooling to normal temperature, crushing and grading, and preparing powder particles with the particle size of 150-200um, thus obtaining the 3D printing material semi-finished product.
9. The method for preparing thermosetting powder coating of 3D printing material according to claim 8, wherein in step a, the high-temperature melt extrusion temperature of the twin-screw extruder is 180 ℃ -200 ℃; in the step b, the low-temperature melt extrusion temperature of the single-screw extruder is 70-90 ℃.
10. The method for preparing thermosetting powder coating for 3D printing material according to claim 8, wherein the semi-finished powder particles are fed into a plasticizing machine to be plasticized at a temperature of 70-80 ℃; in the process, the plasticized coating is pressed by a roller to form a continuous wire rod on a smooth plastic film, and the wire rod flows into a water tank to be cooled until the wire rod is hardened; and then, the wire rod is fed into an automatic cutting machine, and is cut according to the required length and size, so that the wire rod is obtained.
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