CN112092363A - Selective laser sintering forming process of heat-resistant flame-retardant polypropylene automobile intake manifold - Google Patents

Selective laser sintering forming process of heat-resistant flame-retardant polypropylene automobile intake manifold Download PDF

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Publication number
CN112092363A
CN112092363A CN202010883269.4A CN202010883269A CN112092363A CN 112092363 A CN112092363 A CN 112092363A CN 202010883269 A CN202010883269 A CN 202010883269A CN 112092363 A CN112092363 A CN 112092363A
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China
Prior art keywords
sls
intake manifold
automobile intake
powder
heat
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Inventor
胡焕波
吴唯
赵天瑜
刘冬梅
黄建昌
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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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Priority to CN202010883269.4A priority Critical patent/CN112092363A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
    • B29C64/10—Processes of additive manufacturing
    • B29C64/141—Processes of additive manufacturing using only solid materials
    • B29C64/153—Processes of additive manufacturing using only solid materials using layers of powder being selectively joined, e.g. by selective laser sintering or melting
    • 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
    • C08K7/00—Use of ingredients characterised by shape
    • C08K7/22—Expanded, porous or hollow particles
    • C08K7/24—Expanded, porous or hollow particles inorganic
    • C08K7/28—Glass
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/748—Machines or parts thereof not otherwise provided for
    • B29L2031/749—Motors
    • B29L2031/7492—Intake manifold
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/08—Stabilised against heat, light or radiation or oxydation
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2203/00—Applications
    • C08L2203/18—Applications used for pipes

Abstract

The invention provides a selective laser sintering molding process of a heat-resistant flame-retardant polypropylene automobile intake manifold. Mechanically blending commercially available SLS commercial PP powder, ionic liquid modified hollow glass microspheres and a small amount of additive; importing a CAD three-dimensional model of an automobile intake manifold into an SLS computer-aided system; setting SLS technological parameters, and carrying out SLS sintering; and after the molding is finished, taking out the automobile intake manifold after the automobile intake manifold is cooled to room temperature, and removing the floating powder on the surface to obtain a finished product. The method has the advantages of simple process, high forming precision and high production efficiency, and the prepared automobile intake manifold has better mechanical property, heat resistance and flame retardance, particularly can be used for forming the automobile intake manifold which has a complex structure, irregular appearance and curved surface or hollow part inside and is difficult to involve in the injection molding of the parting surface of the mold, saves the production cost, improves the production efficiency and is suitable for large-scale production. And the technological parameters provided by the invention are used for SLS forming, and the produced automobile intake manifold has excellent comprehensive performance.

Description

Selective laser sintering forming process of heat-resistant flame-retardant polypropylene automobile intake manifold
Technical Field
The invention belongs to the technical field of polymer forming, and particularly relates to a selective laser sintering forming process of a heat-resistant flame-retardant polypropylene automobile intake manifold.
Background
The Selective Laser Sintering (SLS) technology is one of additive manufacturing technologies, mainly takes a powder material as a base material, can prepare a composite material functional part or an investment casting part with a complex structure, has the characteristics of high forming speed, high precision and the like, and is widely applied to the fields of aerospace, biomedical, automobile manufacturing and the like.
The SLS has wide raw material sources, including metal powder, ceramic-based powder and polymer material powder, wherein the polymer material powder has relatively low requirements on material increase manufacturing equipment due to relatively low price, and is easy to modify and process, and the like, and becomes a main raw material for SLS molding. However, the polymer powder successfully applied to SLS process and used for producing excellent molded products is very limited, Polyamide (PA) powder accounts for about 95% of the total amount of polymer powder used for SLS, and other material powders are rarely used, and development of more kinds of polymer powder materials is urgently needed.
The automobile intake manifold is an important component of an automobile engine, is composed of a free-form surface with a very complex shape, and has very important influence on improving the intake efficiency and the combustion process. The SLS technology is adopted, rapid and accurate forming can be achieved, the intake manifold is directly connected with the engine cylinder cover, and the use requirement of 130-150 ℃ of the temperature of the engine cylinder cover of the automobile is met. Hua Shuo Kogaku and Pasteur collaborate to successfully form a high strength, high melting point PA6 automotive intake manifold using the SLS technique. According to statistics, the SLS process is used for directly printing the air intake manifold, the cost can be saved by 60%, the efficiency is improved by 40%, and the strength and the thermal stability of the formed air intake manifold meet the requirements of actual work. However, the SLS raw material PA6 is expensive, so that the cost of the automobile intake manifold is increased, and the large-scale production is not facilitated. The formed intake manifold has certain thermal stability but no flame retardance, and easily expands fire when an engine fails and fires, so that the formed intake manifold has great potential safety hazard.
Polypropylene (PP) is one of five general-purpose high polymer materials, has the advantages of small density, high strength, heat resistance, good insulating property, stable chemical property, low price and the like, has very wide application in the aspects of textile fibers, household daily necessities, building, automobile industry and the like, and is one of five general-purpose synthetic resins with the fastest growth speed and the most active new product development. In recent years PP has found increasing use in SLS.
Patent CN 109306114A takes PP as a main raw material, develops a high-performance PP composite material, and prepares an automobile intake manifold by blow molding. Compared with the common nylon intake manifold, the weight is reduced by more than 20%, the manufacturing cost is lower, and the thermal stability is better. However, this process is only suitable for blow molding, and cannot be used in SLS technology, which inevitably increases the cost and reduces the production efficiency of the intake manifold of the automobile with a complicated structure.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects of the prior art, form the automobile intake manifold by using novel PP composite powder as a raw material through Selective Laser Sintering (SLS), and provide a mature process technology for forming the automobile intake manifold by the Selective Laser Sintering (SLS).
In order to achieve the purpose, the invention is realized by the following technical scheme: a selective laser sintering molding process of a heat-resistant flame-retardant polypropylene automobile intake manifold comprises the following steps.
(1) 100 parts by mass of commercially available SLS commercial PP powder, 60 parts by mass of ionic liquid modified hollow glass microspheres, 5 parts by mass of flow aid and 2 parts by mass of antioxidant are put into a high-speed mixer and blended for 15min at a speed of 1200r/min to obtain the PP composite powder.
(2) Designing and building a CAD three-dimensional model of the automobile intake manifold, converting the model into an STL file format, carrying out cross section slicing segmentation on the STL file, and importing the STL file into an SLS computer-assisted system.
(3) Setting SLS technological parameters, wherein the setting range of preheating temperature is 100-160 ℃, the scanning interval is 0.08-0.30 mm, the setting range of laser power is 10-45W, the range of powder laying thickness facilities is 0.08-0.20 mm, and the laser scanning speed is 6000-11000 mm/s; preferably, the printing temperature is 150 ℃, the scanning interval is 0.15mm, the laser power is 20W, the powder spreading thickness is 0.12mm, and the scanning speed is 10000 mm/s.
(4) And (3) filling the PP composite powder into SLS equipment, and carrying out SLS molding.
(5) And after the molding is finished, taking out the prepared automobile intake manifold after the prepared automobile intake manifold is cooled to room temperature along with the powder bed, and removing the floating powder on the surface to obtain a finished product.
In the selective laser sintering molding process of the heat-resistant flame-retardant polypropylene automobile intake manifold, in the step (1), the PP powder is commercially available commercial powder for SLS technology, and the bulk density is 0.895g/cm at 23 DEG C3D50 is 50-90 μm, and the melting point is 140 ℃. In the step (1), the bulk density of the hollow glass beads used for the ionic liquid modified hollow glass beads is 0.03-0.30 g/cm3The grain diameter D50 is 20-100 μm, and the compressive strength is 1-100 MPa; preferably, the particle size D50 is 40-80 μm, and the compressive strength is 10-80 MPa. In the step (1), the flow assistant is one or a combination of several of nano silicon dioxide, nano aluminum oxide and nano calcium oxide. The antioxidant is one or a combination of more of hindered phenol macromolecule antioxidant, phosphorous acid antioxidant and alkyl ester antioxidant; preferably, the antioxidant is antioxidant 1010 or antioxidant 168. The SLS equipment adopts HP252P of Hua Shu Gao Ke, and is aerated with CO2The minimum thickness of the printing machine is 0.1mm, the fastest scanning speed is 14000mm/s, the highest power is 60W, and the highest melting point of the molding material is 220 ℃.
Has the advantages that: compared with the prior art, the selective laser sintering forming process of the heat-resistant flame-retardant polypropylene automobile intake manifold has the following advantages.
(1) The automobile intake manifold formed by selective laser sintering can be formed into the automobile intake manifold with a complex structure, irregular appearance and curved surface, or partially hollowed inside and difficult design of mold parting surface injection molding. Can save the production cost, promote the production efficiency, is suitable for large-scale production.
(2) The commercial SLS commercial PP powder is used as a raw material for Selective Laser Sintering (SLS) forming, the cost is further reduced, the method is suitable for large-scale production, and the PP has good thermal stability and is more suitable for forming an automobile intake manifold.
(3) The ionic liquid modified hollow glass beads not only obviously improve the binding force with a PP matrix and the dispersity in the PP matrix, but also play a role in heterogeneous nucleation in PP composite powder, can accelerate the PP crystallization process and enable the size of PP spherulites to be smaller and more uniform, thereby improving the buckling deformation of PP during SLS sintering. Therefore, the PP composite powder can be obtained by simply mechanically blending the hollow glass microspheres modified by the ionic liquid and commercial SLS PP powder on the market, and the process is simple and flexible. And the ionic liquid modified hollow glass beads are added, so that the mechanical property and the heat resistance of the PP composite powder are improved, the performance requirement of an automobile intake manifold is met, the flame retardant property is given to the automobile intake manifold, and the safety coefficient of an automobile is further improved.
(4) The SLS process parameters are used for preparing the automobile intake manifold, the formed part is high in density and good in mechanical property, and the warping amount of the SLS part is further reduced, so that the forming precision is improved, the forming efficiency is high, and the comprehensive performance is excellent.
Detailed Description
The invention is further illustrated by the following specific examples. It is to be understood that the following examples are illustrative only and are not intended to limit the scope of the invention, which is to be given numerous insubstantial modifications and adaptations by those skilled in the art based on the teachings set forth above.
Example 1
(1) 100 parts of commercial SLS commercial PP powder, 60 parts of ionic liquid modified hollow glass microspheres, 5 parts of flow aid and 2 parts of antioxidant by mass are put into a high-speed mixer and blended for 15min at a speed of 1200 r/min.
(2) SLS forming standard sample strip, setting SLS technological parameters, printing temperature of 100 ℃, scanning interval of 0.15mm, laser power of 20W, powder spreading thickness of 0.12mm and scanning speed of 10000 mm/s.
(3) And carrying out related test performance on the SLS molded standard sample bars, wherein a tensile test is carried out according to GB/T1040.3-2006, a bending test is carried out according to GB/T9341-2008, and a simply supported beam impact test is carried out according to GB/T1043.1-2008.
(4) The SLS forming automobile air inlet manifold is characterized in that SLS technological parameters are set, the printing temperature is 100 ℃, the scanning distance is 0.15mm, the laser power is 20W, the powder spreading thickness is 0.12mm, and the scanning speed is 10000 mm/s.
Example 2
(1) 100 parts of commercial SLS commercial PP powder, 60 parts of ionic liquid modified hollow glass microspheres, 5 parts of flow aid and 2 parts of antioxidant by mass are put into a high-speed mixer and blended for 15min at a speed of 1200 r/min.
(2) SLS forming standard sample strip, setting SLS technological parameters, printing temperature 150 ℃, scanning interval 0.15mm, laser power 20W, powder spreading thickness 0.12mm and scanning speed 10000 mm/s.
(3) And carrying out related test performance on the SLS molded standard sample bars, wherein a tensile test is carried out according to GB/T1040.3-2006, a bending test is carried out according to GB/T9341-2008, and a simply supported beam impact test is carried out according to GB/T1043.1-2008.
(4) The SLS forming automobile air inlet manifold is characterized in that SLS technological parameters are set, the printing temperature is 150 ℃, the scanning distance is 0.15mm, the laser power is 20W, the powder spreading thickness is 0.12mm, and the scanning speed is 10000 mm/s.
Example 3
(1) 100 parts of commercial SLS commercial PP powder, 60 parts of ionic liquid modified hollow glass microspheres, 5 parts of flow aid and 2 parts of antioxidant by mass are put into a high-speed mixer and blended for 15min at a speed of 1200 r/min.
(2) SLS forming standard sample strip, setting SLS technological parameters, printing temperature of 160 ℃, scanning interval of 0.15mm, laser power of 20W, powder spreading thickness of 0.12mm and scanning speed of 10000 mm/s.
(3) And carrying out related test performance on the SLS molded standard sample bars, wherein a tensile test is carried out according to GB/T1040.3-2006, a bending test is carried out according to GB/T9341-2008, and a simply supported beam impact test is carried out according to GB/T1043.1-2008.
(4) The SLS forming automobile air inlet manifold is characterized in that SLS technological parameters are set, the printing temperature is 160 ℃, the scanning distance is 0.15mm, the laser power is 20W, the powder spreading thickness is 0.12mm, and the scanning speed is 10000 mm/s.
Example 4
(1) 100 parts of commercial SLS commercial PP powder, 60 parts of ionic liquid modified hollow glass microspheres, 5 parts of flow aid and 2 parts of antioxidant by mass are put into a high-speed mixer and blended for 15min at a speed of 1200 r/min.
(2) SLS molding standard sample strip, setting SLS technological parameters, printing temperature of 150 ℃, scanning interval of 0.08mm, laser power of 20W, powder spreading thickness of 0.12mm and scanning speed of 10000 mm/s.
(3) And carrying out related test performance on the SLS molded standard sample bars, wherein a tensile test is carried out according to GB/T1040.3-2006, a bending test is carried out according to GB/T9341-2008, and a simply supported beam impact test is carried out according to GB/T1043.1-2008.
(4) And (3) SLS forming the automobile air inlet manifold, setting SLS technological parameters, printing temperature of 150 ℃, scanning interval of 0.08mm, laser power of 20W, powder spreading thickness of 0.12mm and scanning speed of 10000 mm/s.
Example 5
(1) 100 parts of commercial SLS commercial PP powder, 60 parts of ionic liquid modified hollow glass microspheres, 5 parts of flow aid and 2 parts of antioxidant by mass are put into a high-speed mixer and blended for 15min at a speed of 1200 r/min.
(2) SLS forming standard sample strip, setting SLS technological parameters, printing temperature 150 ℃, scanning interval 0.30mm, laser power 20W, powder spreading thickness 0.12mm, and scanning speed 10000 mm/s.
(3) And carrying out related test performance on the SLS molded standard sample bars, wherein a tensile test is carried out according to GB/T1040.3-2006, a bending test is carried out according to GB/T9341-2008, and a simply supported beam impact test is carried out according to GB/T1043.1-2008.
(4) The SLS forming automobile air inlet manifold is characterized in that SLS technological parameters are set, the printing temperature is 150 ℃, the scanning distance is 0.30mm, the laser power is 20W, the powder spreading thickness is 0.12mm, and the scanning speed is 10000 mm/s.
Example 6
(1) 100 parts of commercial SLS commercial PP powder, 60 parts of ionic liquid modified hollow glass microspheres, 5 parts of flow aid and 2 parts of antioxidant by mass are put into a high-speed mixer and blended for 15min at a speed of 1200 r/min.
(2) SLS forming standard sample strip, setting SLS technological parameters, printing temperature 150 ℃, scanning interval 0.15mm, laser power 10W, powder spreading thickness 0.12mm and scanning speed 10000 mm/s.
(3) And carrying out related test performance on the SLS molded standard sample bars, wherein a tensile test is carried out according to GB/T1040.3-2006, a bending test is carried out according to GB/T9341-2008, and a simply supported beam impact test is carried out according to GB/T1043.1-2008.
(4) The SLS forming automobile air inlet manifold is characterized in that SLS technological parameters are set, the printing temperature is 150 ℃, the scanning distance is 0.15mm, the laser power is 10W, the powder spreading thickness is 0.12mm, and the scanning speed is 10000 mm/s.
Example 7
(1) 100 parts of commercial SLS commercial PP powder, 60 parts of ionic liquid modified hollow glass microspheres, 5 parts of flow aid and 2 parts of antioxidant by mass are put into a high-speed mixer and blended for 15min at a speed of 1200 r/min.
(2) SLS forming standard sample strip, setting SLS technological parameters, printing temperature 150 ℃, scanning interval 0.15mm, laser power 30W, powder spreading thickness 0.12mm and scanning speed 10000 mm/s.
(3) And carrying out related test performance on the SLS molded standard sample bars, wherein a tensile test is carried out according to GB/T1040.3-2006, a bending test is carried out according to GB/T9341-2008, and a simply supported beam impact test is carried out according to GB/T1043.1-2008.
(4) The SLS forming automobile air inlet manifold is characterized in that SLS technological parameters are set, the printing temperature is 150 ℃, the scanning distance is 0.15mm, the laser power is 30W, the powder spreading thickness is 0.12mm, and the scanning speed is 10000 mm/s.
Example 8
(1) 100 parts of commercial SLS commercial PP powder, 60 parts of ionic liquid modified hollow glass microspheres, 5 parts of flow aid and 2 parts of antioxidant by mass are put into a high-speed mixer and blended for 15min at a speed of 1200 r/min.
(2) SLS forming standard sample strip, setting SLS technological parameters, printing temperature 150 ℃, scanning interval 0.15mm, laser power 45W, powder spreading thickness 0.12mm and scanning speed 10000 mm/s.
(3) And carrying out related test performance on the SLS molded standard sample bars, wherein a tensile test is carried out according to GB/T1040.3-2006, a bending test is carried out according to GB/T9341-2008, and a simply supported beam impact test is carried out according to GB/T1043.1-2008.
(4) The SLS forming automobile air inlet manifold is characterized in that SLS technological parameters are set, the printing temperature is 150 ℃, the scanning distance is 0.15mm, the laser power is 45W, the powder spreading thickness is 0.12mm, and the scanning speed is 10000 mm/s.
Example 9
(1) 100 parts of commercial SLS commercial PP powder, 60 parts of ionic liquid modified hollow glass microspheres, 5 parts of flow aid and 2 parts of antioxidant by mass are put into a high-speed mixer and blended for 15min at a speed of 1200 r/min.
(2) SLS forming standard sample strip, setting SLS technological parameters, printing temperature 150 ℃, scanning interval 0.15mm, laser power 20W, powder spreading thickness 0.08mm, and scanning speed 10000 mm/s.
(3) And carrying out related test performance on the SLS molded standard sample bars, wherein a tensile test is carried out according to GB/T1040.3-2006, a bending test is carried out according to GB/T9341-2008, and a simply supported beam impact test is carried out according to GB/T1043.1-2008.
(4) And (3) SLS forming the automobile air inlet manifold, setting SLS technological parameters, printing temperature of 150 ℃, scanning interval of 0.15mm, laser power of 20W, powder spreading thickness of 0.08mm and scanning speed of 10000 mm/s.
Example 10
(1) 100 parts of commercial SLS commercial PP powder, 60 parts of ionic liquid modified hollow glass microspheres, 5 parts of flow aid and 2 parts of antioxidant by mass are put into a high-speed mixer and blended for 15min at a speed of 1200 r/min.
(2) SLS forming standard sample strip, setting SLS technological parameters, printing temperature 150 ℃, scanning interval 0.15mm, laser power 20W, powder spreading thickness 0.20mm, and scanning speed 10000 mm/s.
(3) And carrying out related test performance on the SLS molded standard sample bars, wherein a tensile test is carried out according to GB/T1040.3-2006, a bending test is carried out according to GB/T9341-2008, and a simply supported beam impact test is carried out according to GB/T1043.1-2008.
(4) The SLS forming automobile air inlet manifold is characterized in that SLS technological parameters are set, the printing temperature is 150 ℃, the scanning distance is 0.15mm, the laser power is 20W, the powder spreading thickness is 0.20mm, and the scanning speed is 10000 mm/s.
Example 11
(1) 100 parts of commercial SLS commercial PP powder, 60 parts of ionic liquid modified hollow glass microspheres, 5 parts of flow aid and 2 parts of antioxidant by mass are put into a high-speed mixer and blended for 15min at a speed of 1200 r/min.
(2) SLS forming standard sample strip, setting SLS technological parameters, printing temperature 150 deg.C, scanning interval 0.15mm, laser power 20W, powder spreading thickness 0.12mm, and scanning speed 6000 mm/s.
(3) And carrying out related test performance on the SLS molded standard sample bars, wherein a tensile test is carried out according to GB/T1040.3-2006, a bending test is carried out according to GB/T9341-2008, and a simply supported beam impact test is carried out according to GB/T1043.1-2008.
(4) And (3) SLS forming the automobile air inlet manifold, setting SLS technological parameters, printing temperature of 150 ℃, scanning interval of 0.15mm, laser power of 20W, powder spreading thickness of 0.12mm and scanning speed of 6000 mm/s.
Example 12
(1) 100 parts of commercial SLS commercial PP powder, 60 parts of ionic liquid modified hollow glass microspheres, 5 parts of flow aid and 2 parts of antioxidant by mass are put into a high-speed mixer and blended for 15min at a speed of 1200 r/min.
(2) SLS forming standard sample strip, setting SLS technological parameters, printing temperature 150 deg.C, scanning interval 0.15mm, laser power 20W, powder spreading thickness 0.12mm, and scanning speed 11000 mm/s.
(3) And carrying out related test performance on the SLS molded standard sample bars, wherein a tensile test is carried out according to GB/T1040.3-2006, a bending test is carried out according to GB/T9341-2008, and a simply supported beam impact test is carried out according to GB/T1043.1-2008.
(4) And (3) SLS forming the automobile air inlet manifold, setting SLS technological parameters, printing temperature of 150 ℃, scanning interval of 0.15mm, laser power of 20W, powder spreading thickness of 0.12mm and scanning speed of 11000 mm/s.
Effect verification
The results of the mechanical property tests of the SLS samples obtained in examples 1 to 12 are shown in table 1.
TABLE 1 results of mechanical Properties test of samples of examples
Figure BDA0002654791450000121
Figure BDA0002654791450000131
The results of measuring the density and the molding accuracy of the SLS samples obtained in examples 1 to 12 are shown in Table 2.
TABLE 2 results of testing density and forming accuracy of samples of each example
Figure BDA0002654791450000132
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 (9)

1. A selective laser sintering forming process of a heat-resistant flame-retardant polypropylene automobile intake manifold is characterized by comprising the following steps: the method comprises the following steps:
(1) putting 100 parts by mass of commercially available SLS commercial PP powder, 60 parts by mass of ionic liquid modified hollow glass microspheres, 5 parts by mass of flow aid and 2 parts by mass of antioxidant into a high-speed mixer, and blending for 15min at a speed of 1200r/min to obtain PP composite powder;
(2) designing and building a CAD three-dimensional model of the automobile intake manifold, converting the model into an STL file format, carrying out cross section slicing segmentation on the STL file, and importing the STL file into an SLS computer-assisted system;
(3) setting SLS technological parameters, wherein the setting range of preheating temperature is 100-160 ℃, the scanning interval is 0.08-0.30 mm, the setting range of laser power is 10-45W, the range of powder laying thickness facilities is 0.08-0.20 mm, and the laser scanning speed is 6000-11000 mm/s;
(4) filling the PP composite powder into SLS equipment, and carrying out SLS molding;
(5) and after the molding is finished, taking out the prepared automobile intake manifold after the prepared automobile intake manifold is cooled to room temperature along with the powder bed, and removing the floating powder on the surface to obtain a finished product.
2. The selective laser sintering molding process of the heat-resistant flame-retardant polypropylene automobile intake manifold according to claim 1, characterized in that: in the step (3), the printing temperature is 150 ℃, the scanning interval is 0.15mm, the laser power is 20W, the powder spreading thickness is 0.12mm, and the scanning speed is 10000 mm/s.
3. The selective laser sintering molding process of the heat-resistant flame-retardant polypropylene automobile intake manifold according to claim 1, characterized in that: in the step (1), the PP powder is a commercial powder used for SLS technology, and the bulk density is 0.895g/cm at 23 DEG C3D50= 50-90 μm, melting point 140 ℃.
4. The selective laser sintering molding process of the heat-resistant flame-retardant polypropylene automobile intake manifold according to claim 1, characterized in that: in the step (1), the bulk density of the hollow glass beads used for the ionic liquid modified hollow glass beads is 0.03-0.30 g/cm3The particle diameter D50 is 20-100 μm, and the compressive strength is 1-100 MPa.
5. The selective laser sintering molding process of the heat-resistant flame-retardant polypropylene automobile intake manifold according to claim 4, characterized in that: in the step (1), the particle size D50 of the hollow glass bead used by the ionic liquid modified hollow glass bead is 40-80 μm; the compressive strength is 10-80 MPa.
6. The selective laser sintering molding process of the heat-resistant flame-retardant polypropylene automobile intake manifold according to claim 1, characterized in that: in the step (1), the flow assistant is one or a combination of several of nano silicon dioxide, nano aluminum oxide and nano calcium oxide.
7. The selective laser sintering molding process of the heat-resistant flame-retardant polypropylene automobile intake manifold according to claim 1, characterized in that: in the step (1), the antioxidant is one or a combination of several of hindered phenol macromolecule antioxidant, phosphorous acid antioxidant and alkyl ester antioxidant.
8. The selective laser sintering molding process of the heat-resistant flame-retardant polypropylene automobile intake manifold according to claim 7, characterized in that: in the step (1), the antioxidant is an antioxidant 1010 or an antioxidant 168.
9. The selective laser sintering molding process of the heat-resistant flame-retardant polypropylene automobile intake manifold according to claim 1, characterized in that: the SLS equipment adopts HP252P of Hua Shu Gao Ke, and is aerated with CO2The minimum thickness of the printing machine is 0.1mm, the fastest scanning speed is 14000mm/s, the highest power is 60W, and the highest melting point of the molding material is 220 ℃.
CN202010883269.4A 2020-08-28 2020-08-28 Selective laser sintering forming process of heat-resistant flame-retardant polypropylene automobile intake manifold Pending CN112092363A (en)

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