CN117067451B - Die, thermoplastic composite material, processing method of thermoplastic composite material and electronic equipment - Google Patents
Die, thermoplastic composite material, processing method of thermoplastic composite material and electronic equipment Download PDFInfo
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- CN117067451B CN117067451B CN202311334189.3A CN202311334189A CN117067451B CN 117067451 B CN117067451 B CN 117067451B CN 202311334189 A CN202311334189 A CN 202311334189A CN 117067451 B CN117067451 B CN 117067451B
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- 238000003672 processing method Methods 0.000 title claims abstract description 15
- 239000012774 insulation material Substances 0.000 claims abstract description 31
- 239000000835 fiber Substances 0.000 claims description 83
- 238000000748 compression moulding Methods 0.000 claims description 37
- 238000010438 heat treatment Methods 0.000 claims description 33
- 238000012545 processing Methods 0.000 claims description 28
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 26
- 239000004917 carbon fiber Substances 0.000 claims description 26
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 25
- 238000000034 method Methods 0.000 claims description 21
- 239000002184 metal Substances 0.000 claims description 19
- 229920005992 thermoplastic resin Polymers 0.000 claims description 19
- 229910052755 nonmetal Inorganic materials 0.000 claims description 14
- -1 polypropylene Polymers 0.000 claims description 12
- 229920001187 thermosetting polymer Polymers 0.000 claims description 12
- 239000004642 Polyimide Substances 0.000 claims description 11
- 229920001721 polyimide Polymers 0.000 claims description 11
- 239000003365 glass fiber Substances 0.000 claims description 10
- 238000009941 weaving Methods 0.000 claims description 7
- 229920000515 polycarbonate Polymers 0.000 claims description 6
- 239000004417 polycarbonate Substances 0.000 claims description 6
- 239000004743 Polypropylene Substances 0.000 claims description 5
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- 239000004677 Nylon Substances 0.000 claims description 4
- 239000004696 Poly ether ether ketone Substances 0.000 claims description 4
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- 229920001778 nylon Polymers 0.000 claims description 4
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- 238000005516 engineering process Methods 0.000 description 7
- 239000003292 glue Substances 0.000 description 7
- 238000000465 moulding Methods 0.000 description 7
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 6
- 239000007769 metal material Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
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- 239000011347 resin Substances 0.000 description 5
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
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- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 239000011324 bead Substances 0.000 description 2
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- 229910000422 cerium(IV) oxide Inorganic materials 0.000 description 2
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- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 229920000106 Liquid crystal polymer Polymers 0.000 description 1
- 239000004977 Liquid-crystal polymers (LCPs) Substances 0.000 description 1
- 239000004697 Polyetherimide Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 230000003190 augmentative effect Effects 0.000 description 1
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- 229910052796 boron Inorganic materials 0.000 description 1
- 238000009954 braiding Methods 0.000 description 1
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- 238000004132 cross linking Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 229920006258 high performance thermoplastic Polymers 0.000 description 1
- 239000003562 lightweight material Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
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- 229920001230 polyarylate Polymers 0.000 description 1
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- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
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Classifications
-
- 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
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
-
- 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
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
-
- 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
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/56—Coatings, e.g. enameled or galvanised; Releasing, lubricating or separating agents
-
- 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
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
- B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
- B29C35/0805—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
-
- 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
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
-
- 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
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K5/00—Casings, cabinets or drawers for electric apparatus
- H05K5/02—Details
-
- 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
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
- B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
- B29C35/0805—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
- B29C2035/0822—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation using IR radiation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
- B29K2105/08—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of continuous length, e.g. cords, rovings, mats, fabrics, strands or yarns
- B29K2105/0872—Prepregs
-
- 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
- B29L2031/34—Electrical apparatus, e.g. sparking plugs or parts thereof
Abstract
The application discloses a mould, thermoplastic composite material and processing method, electronic equipment thereof, relates to intelligent electronic equipment technical field, the mould includes first mould benevolence and second mould benevolence, first mould benevolence and/or the die cavity surface of second mould benevolence is thermal insulation material, wherein, thermal conductivity of thermal insulation material is less than or equal to 1W/(m.K). The technical problem that the appearance reject ratio of the thermoplastic composite material in the related art is high is solved.
Description
Technical Field
The application relates to the technical field of intelligent electronic equipment, in particular to a die, a thermoplastic composite material, a processing method of the thermoplastic composite material and electronic equipment.
Background
With the development of AR (Augmented Reality) and Virtual Reality (VR) technologies, the metauniverse concept becomes possible gradually, and new demands of structural materials and molding processes generated on the basis have huge imaginative space. For the appearance structural materials of AR/VR, the future development direction will tend to be light-weight, and light-weight research is a major mainstream of modern material design and manufacturing. As an appearance structural material for AR/VR, it is also desirable to have high strength and modulus to ensure that it is not easily deformed and damaged during processing and use. The low-density nonmetallic materials such as carbon fiber have the advantage of light weight, and are ideal light weight materials. The linear long chain molecules of the thermoplastic resin can not be crosslinked and solidified in the forming process, so that the toughness of the material can be improved, and the thermoplastic composite material formed by compounding the thermoplastic resin and the nonmetallic material has higher toughness, higher interlayer damage resistance and higher product design freedom. In addition, the high-performance thermoplastic resin has relatively high use temperature and melting point, and the thermoplastic resin only changes physical state in the melting process and does not react chemically, so that the thermoplastic composite material has the advantages of high use temperature, green recycling, short molding cycle and the like.
At present, the molding processing experience of the thermoplastic composite materials at home and abroad is still less, and the thermoplastic composite materials at home and abroad are mostly and intensively applied to the field of large structural members, such as aerospace, automobiles, sports equipment and the like, because the thermoplastic composite materials are easy to have poor appearance during processing, the poor appearance of the thermoplastic composite materials is less in specific area on the large structural members and is not obvious, but the specific area is greatly increased when the thermoplastic composite materials are applied to small electronic equipment, so that the thermoplastic composite materials are rarely applied to the large-scale application technology in the field of small structural members with complex structures and high precision. Thus, breaking through the application of thermoplastic composites in the field of small electronic structural parts remains a challenge.
Disclosure of Invention
The main purpose of the application is to provide a die, a thermoplastic composite material, a processing method thereof and electronic equipment, and aims to solve the technical problem of high appearance reject ratio of the thermoplastic composite material in the related art.
In order to achieve the above object, the present application provides a mold, which includes a first mold core and a second mold core, wherein a surface of a mold cavity of the first mold core and/or the second mold core is made of a heat insulation material, and a thermal conductivity coefficient of the heat insulation material is less than or equal to 1W/(m·k).
Optionally, the first mold core and/or the second mold core include a metal matrix layer and a heat insulation material layer, wherein the heat insulation material layer is located at a side close to the mold cavity, and the metal matrix layer is located at a side far away from the mold cavity.
Optionally, the thermal insulation material layer comprises at least one of a thermal insulation glue layer and a thermal insulation coating, wherein the thermal insulation glue layer comprises at least one of polyimide and polytetrafluoroethylene; the thermal barrier coating includes at least one of an inorganic thermal barrier coating and an organic thermal barrier coating.
Optionally, the inorganic thermal-insulation coating comprises at least one of nano zirconia, nano alumina, nano titania, nano ceria and hollow ceramic beads;
and/or the organic thermal insulation coating comprises at least one of polytetrafluoroethylene, organosilicon and polyimide.
Optionally, the thickness of the heat insulation adhesive layer is 0.05-0.5mm;
and/or the thickness of the thermal insulation coating is 0.02-0.5mm.
Optionally, the first mold core and/or the second mold core are made of a heat insulating material, wherein the heat insulating material comprises at least one of a thermosetting glass fiber composite material and a thermosetting carbon fiber composite material.
Further, the present application also provides a thermoplastic composite processing method, including the steps of:
placing a thermoplastic nonmetallic fiber prepreg in a mold, and carrying out infrared heating plasticization on the thermoplastic nonmetallic fiber prepreg, wherein the mold is the mold described above;
and (3) closing the die, and performing compression molding on the plasticized thermoplastic nonmetallic fiber prepreg to obtain the thermoplastic composite material.
Optionally, the temperature of the infrared heating is 300-600 ℃, and the time of the infrared heating is 10-100s;
and/or the temperature of the die for compression molding is 40-120 ℃, and the pressure for compression molding is 20-180kgf/cm 2 The compression molding time is 0.5-5min.
Optionally, the thermoplastic nonmetallic fiber prepreg includes a thermoplastic resin and nonmetallic fibers; wherein the nonmetallic fiber comprises at least one of a carbon fiber and a glass fiber; the thermoplastic resin includes at least one of polypropylene, polyimide, nylon, polycarbonate, polyurethane, polyether ether ketone, and polyphenylene sulfide.
Optionally, the fibers in the thermoplastic nonmetallic fiber prepreg are woven, and the weaving mode of the fibers in the thermoplastic nonmetallic fiber prepreg comprises at least one of unidirectional tape, plain weave, twill weave and satin weave.
Optionally, the thermoplastic composite has a thickness of 0.2-2mm.
The application also provides a thermoplastic composite material, which is processed by the thermoplastic composite material processing method.
The present application also provides an electronic device comprising the thermoplastic composite material as described above.
The application provides a die, a thermoplastic composite material, a processing method thereof and electronic equipment, wherein the die comprises a first die core and a second die core, and the surface of a die cavity of the first die core and/or the surface of a die cavity of the second die core is made of a heat insulation material, and the heat conduction coefficient of the heat insulation material is less than or equal to 1W/(m.K). The surface of the die cavity, which is in contact with the raw material to be processed in the die cavity, of the die core is made of a heat insulation material, so that the purpose of slowing down the heat dissipation speed of the raw material to be processed in the die cavity can be achieved. Therefore, the situation that the appearance of the thermoplastic composite material is poor when the thermoplastic composite material is processed is overcome, if the thermoplastic composite material is applied to small-sized electronic equipment such as consumer electronics and the like, such as AR/VR equipment, earphones, mobile phones and the like, the technical defect that the appearance of the thermoplastic composite material can have great influence on the appearance of the product is overcome, the appearance of the thermoplastic composite material processed by the die provided by the application is smoother and smoother, the thermoplastic composite material is more suitable for being applied to an appearance structural member of the small-sized electronic equipment, and the temperature of the die is not required to be continuously increased and reduced in the one-time preparation process due to the fact that the heat dissipation speed is slowed down, so that the processing technology can be simplified, the energy consumption is saved, and the processing cost is reduced.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application.
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the description of the embodiments or the prior art will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a schematic structural view of an embodiment of a die of the present application;
FIG. 2 is a schematic flow chart of an embodiment of a thermoplastic composite processing method of the present application;
FIG. 3 is a photomicrograph of the surface of a thermoplastic composite material of example one of the present application;
FIG. 4 is a photomicrograph of the surface of a thermoplastic composite of example two of the present application;
FIG. 5 is a photomicrograph of the surface of a thermoplastic composite of example III of the present application;
fig. 6 is a micrograph of the surface of a thermoplastic composite of comparative example one of the present application.
Description of the reference numerals
The implementation, functional features and advantages of the present application will be further described with reference to the accompanying drawings in conjunction with the embodiments.
Detailed Description
In order to make the above objects, features and advantages of the present invention more comprehensible, the following description of the embodiments accompanied with the accompanying drawings will be given in detail. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In an embodiment of the present application, referring to fig. 1, the mold includes a first mold core 10 and a second mold core 20, and a cavity surface of the first mold core 10 and/or the second mold core 20 is a heat insulation material 30, where a thermal conductivity coefficient of the heat insulation material 30 is less than or equal to 1W/(m·k).
In this embodiment, it should be noted that the mold includes a first mold core and a second mold core, and after the first mold core and the second mold core are clamped, a mold cavity is formed between the first mold core and the second mold core, and during compression molding, a raw material placed in the mold cavity contacts with a cavity wall of the mold cavity and exchanges heat with the mold cavity through the cavity wall. When processing thermoplastic composite materials, the appearance of the final product is influenced because the thermoplastic composite materials are easy to deform when heated or cooled, the temperature of the thermoplastic composite materials needs to be higher than the glass transition temperature when the thermoplastic composite materials are molded, and if the temperature of a die is lower, the temperature of the surface of the thermoplastic composite materials is instantly reduced even the temperature of the local surface of the thermoplastic composite materials is reduced when the die with lower temperature is contacted with the thermoplastic composite materials with higher temperature, and the appearance of the thermoplastic composite materials is poor. In order to solve the problem, the temperature of the die can be raised, the temperature difference between the die and the thermoplastic composite material is reduced, the die and the thermoplastic composite material are completely attached after die pressing, and then the temperature of the die is reduced, so that the thermoplastic composite material is rapidly and uniformly cooled, and the condition of poor appearance can be effectively reduced, but the die is required to be subjected to multiple temperature raising and cooling control in the one-step forming process, the process is complex, and the energy consumption is high, so that the processing cost is increased.
The surface of the mold cavity on at least one of the first mold core and the second mold core is made of a heat insulating material, and other surfaces of the first mold core and/or the second mold core except the surface of the mold cavity may be made of a heat insulating material or other materials, and may be determined according to actual needs. The heat insulation material is a material capable of blocking heat flow transmission, and can effectively slow down heat dissipation of raw materials in the die cavity under the condition that the heat conductivity coefficient of the heat insulation material is less than or equal to 1W/(m.K), and in an implementation mode, the heat insulation material can also have certain heat stability and certain hardness, so that the heat insulation material does not deform when being contacted with the raw materials with higher temperature in the die cavity, and the raw materials in the die cavity can be ensured to obtain better appearance based on the die cavity.
In one embodiment, during compression molding, the raw material may be placed in the cavity of the first mold core, so as to heat the raw material placed in the cavity of the first mold core, but before the mold is closed, the second mold core is not in contact with the raw material, so that the temperature of the second mold core is lower, and therefore, the surface of the cavity of the second mold core may be set to be a heat insulating material, so that during the mold closing, although the temperature of the second mold core is lower, the heat insulating material is spaced between the second mold core and the raw material, and the heat insulating material may slow down heat transfer between the raw material and the second mold core, thereby slowing down heat dissipation of the raw material, reducing deformation caused by rapid heat dissipation, and thus reducing appearance defects. Therefore, the second die core is not required to be repeatedly subjected to temperature rise and temperature reduction control, the process can be effectively simplified, the energy consumption is saved, and the problem of poor appearance rate can be reduced.
In one embodiment, during compression molding, the raw material may be preheated and then placed in the mold cavity of the first mold core, and then the second mold core and the first mold core are combined to mold the raw material, so that the raw material with higher temperature needs to be in contact with the first mold core with lower temperature and the second mold core with lower temperature, and therefore, the surfaces of the mold cavities of the first mold core and the second mold core are both required to be made of heat insulation materials, the heat loss of the raw material can be slowed down, the deformation caused by rapid heat dissipation is reduced, and the appearance defect is reduced. Therefore, the first die core and the second die core do not need to be repeatedly subjected to temperature rise and temperature reduction control, the process can be effectively simplified, the energy consumption is saved, and the problem of poor appearance rate can be reduced.
Optionally, the first mold core and/or the second mold core include a metal matrix layer and a heat insulation material layer, wherein the heat insulation material layer is located at a side close to the mold cavity, and the metal matrix layer is located at a side far away from the mold cavity.
In this embodiment, the metal material has high strength, excellent high temperature resistance and high pressure resistance, and is suitable for processing into a die for compression molding, and the metal material has good processing performance and is suitable for processing a die with a complex structure. However, since the metal has a high thermal conductivity and a rapid temperature change, when the thermoplastic composite material is molded by using a metal mold, the thermoplastic composite material is easily deformed due to the influence of the temperature change of the metal mold, resulting in poor appearance. Therefore, the metal matrix layer of the metal material processing die can be adopted, and then the heat insulation material layer is processed on one side, close to the die cavity, of the metal matrix layer, so that the die with a complex structure and high strength can be processed, and the purpose of slowing down the heat dissipation of raw materials in the die cavity can be realized through the heat insulation material layer.
Optionally, the thermal insulation material layer comprises at least one of a thermal insulation glue layer and a thermal insulation coating, wherein the thermal insulation glue layer comprises at least one of polyimide and polytetrafluoroethylene; the thermal barrier coating includes at least one of an inorganic thermal barrier coating and an organic thermal barrier coating.
In this embodiment, the processing manner of the heat insulating material layer includes at least one of adhering a heat insulating glue layer and coating a heat insulating coating. The process for pasting the heat insulation glue layer is simpler, the cost is lower, but the machining precision is lower, and the die of a product with lower precision requirement can be machined; the processing precision of the coated heat-insulating coating is higher, and the die of a product with a more complex structure or higher precision requirement can be processed. Wherein the thermal insulation adhesive layer comprises at least one of polyimide and polytetrafluoroethylene; the thermal barrier coating includes at least one of an inorganic thermal barrier coating and an organic thermal barrier coating.
Optionally, the inorganic thermal-insulation coating comprises at least one of nano zirconia, nano alumina, nano titania, nano ceria and hollow ceramic beads;
and/or the organic thermal insulation coating comprises at least one of polytetrafluoroethylene, organosilicon and polyimide.
In one embodiment, the thermal barrier coating may be applied by: polishing, cleaning and the like are carried out on the surface of the die cavity of the metal matrix layer, coating raw materials required to be sprayed are prepared, high-pressure airless spraying or air-assisted spraying is adopted to spray the coating raw materials on the surface of the die cavity of the metal matrix layer, and the die cavity is dried to form the heat insulation material layer.
Optionally, the thickness of the heat insulation adhesive layer is 0.05-0.5mm;
and/or the thickness of the thermal insulation coating is 0.02-0.5mm.
In this embodiment, the hardness and strength of the insulating material are generally smaller than those of the metal material, and therefore, the thickness of the insulating material layer should be as small as possible while satisfying the demand for the insulating performance. The thickness of the layer of insulating glue is thus determined to be 0.05-0.5mm, for example 0.05mm, 0.1mm, 0.3mm, 0.5mm, etc. The thickness of the thermal barrier coating is 0.02-0.5mm, e.g., 0.02mm, 0.05mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, etc.
Optionally, the first mold core and/or the second mold core are made of a heat insulating material, wherein the heat insulating material comprises at least one of a thermosetting glass fiber composite material and a thermosetting carbon fiber composite material.
In this embodiment, it should be noted that the first mold core and/or the second mold core may also be made of a heat insulating material, and in the case of preparing the mold core from the heat insulating material, the heat insulating material having a certain hardness is required to be selected due to the lack of the metal matrix layer to provide strength and hardness, and may include at least one of a thermosetting glass fiber composite material and a thermosetting carbon fiber composite material, for example. The thermosetting resin has high hardness, high strength and good pressure resistance, the manufactured mold is not easy to deform when the thermoplastic resin is subjected to compression molding, and the heat conductivity coefficients of the thermosetting glass fiber composite material and the thermosetting carbon fiber composite material are smaller than those of metal, so that the aim of slowing down the heat dissipation rate can be fulfilled.
In this embodiment, the mold includes a first mold core and a second mold core, and a cavity surface of the first mold core and/or the second mold core is a heat insulation material, where a thermal conductivity coefficient of the heat insulation material is less than or equal to 1W/(m·k). The surface of the die cavity, which is in contact with the raw material to be processed in the die cavity, of the die core is made of a heat insulation material, so that the purpose of slowing down the heat dissipation speed of the raw material to be processed in the die cavity can be achieved. Therefore, the situation that the appearance of the thermoplastic composite material is poor when the thermoplastic composite material is processed is overcome, if the thermoplastic composite material is applied to small-sized electronic equipment such as consumer electronics and the like, such as AR/VR equipment, earphones, mobile phones and the like, the technical defect that the appearance of the thermoplastic composite material can have great influence on the appearance of the product is overcome, the appearance of the thermoplastic composite material processed by the die provided by the application is smoother and smoother, the thermoplastic composite material is more suitable for being applied to an appearance structural member of the small-sized electronic equipment, and the temperature of the die is not required to be continuously increased and reduced in the one-time preparation process due to the fact that the heat dissipation speed is slowed down, so that the processing technology can be simplified, the energy consumption is saved, and the processing cost is reduced.
An embodiment of the present application provides a thermoplastic composite processing method, in an embodiment of the thermoplastic composite processing method of the present application, referring to fig. 2, the thermoplastic composite processing method includes the following steps:
step S10, placing a thermoplastic nonmetallic fiber prepreg in a mold, and carrying out infrared heating plasticization on the thermoplastic nonmetallic fiber prepreg, wherein the mold is the mold described above;
in this embodiment, the thermoplastic composite material processed in this embodiment may be used as part or all of a housing of a small electronic device, or may be used as part or all of a housing of a functional module or device in a small electronic device. Illustratively, the thermoplastic composite may be used as a temple for VR masks, AR glasses, and the like.
In one implementation, the small electronic device may be a head mounted display device, a smart wearable device, or the like, such as VR/AR glasses, VR/AR helmets, or the like. The head of human body is very high to wearing the weight sensitivity of product, and the product of overweight can let the consumer produce uncomfortable and feel, has reduced the comfort level to influence user experience, therefore wear display device and intelligent wearing equipment and to the demand of lightweight higher. The non-metal fiber in the thermoplastic composite material has lighter weight and higher strength, so that the thermoplastic composite material has lighter weight compared with the plastic material under the same strength, and the requirements of the head-mounted display equipment and the intelligent wearing equipment on light weight can be better met.
The thermoplastic nonmetallic fiber prepreg refers to a composition of a resin matrix and a reinforcement body, wherein the resin matrix is prepared by impregnating continuous nonmetallic fibers with thermoplastic resin under strictly controlled conditions, and the preparation method of the thermoplastic nonmetallic fiber prepreg is similar to the prior art and is not repeated herein. The thermoplastic resin comprises one or more of polypropylene, nylon, polycarbonate, polyurethane, polyether-ether-ketone, polyphenylene sulfide, rubber, polyethylene, polystyrene, polyethylene terephthalate, polyimide, polyetherimide, polyarylate, polyaryletherketone, liquid crystal polymers and the like, has the performances of softening by heating and hardening by cooling, does not generate chemical reaction in the softening and hardening processes, and does not generate cross-linking solidification in the forming process, so that the toughness of the material can be improved, the thermoplastic composite material formed by compounding the thermoplastic resin with a non-metal material has the advantages of higher toughness, higher interlayer damage resistance performance, higher product design freedom degree, relatively higher use temperature and melting point, and the thermoplastic resin with high performance only generates physical state change without generating chemical reaction in the melting process, is favorable for recycling, and therefore, the thermoplastic composite material also has the advantages of higher use temperature, greenness, short forming period and the like. The nonmetal fibers are fibers made of inorganic nonmetal materials or organic nonmetal materials, the density of the nonmetal fibers is low, the nonmetal fibers are favorable for meeting the light weight requirements of products, the inorganic nonmetal materials comprise carbon fibers, glass fibers, ceramic fibers, boron fibers and the like, and the inorganic nonmetal materials have the advantages of high modulus, high strength and low density.
The infrared heating can heat the thermoplastic nonmetallic fiber prepreg under the condition that the thermoplastic nonmetallic fiber prepreg is not contacted, so that the thermoplastic nonmetallic fiber prepreg is heated and gradually softened and gradually attached to the cavity surface of the die after being softened, compared with a heating mode that the thermoplastic nonmetallic fiber prepreg is heated by heating the die and then attaching the die to the thermoplastic nonmetallic fiber prepreg, when the shell surface is a curved surface, the contact surface of the die and the thermoplastic nonmetallic fiber prepreg is smaller when the die is just started to perform die pressing, if the thermoplastic nonmetallic fiber prepreg is heated by conducting heat through the die, the heating is slower and the heating is uneven, and if the infrared heating mode is adopted, the thermoplastic nonmetallic fiber prepreg can be uniformly and rapidly heated to a required temperature.
Optionally, the thermoplastic nonmetallic fiber prepreg includes a thermoplastic resin and nonmetallic fibers; wherein the nonmetallic fiber comprises at least one of a carbon fiber and a glass fiber; the thermoplastic resin includes at least one of polypropylene, polyimide, nylon, polycarbonate, polyurethane, polyether ether ketone, and polyphenylene sulfide.
Optionally, the fibers in the thermoplastic nonmetallic fiber prepreg are woven, and the weaving mode of the fibers in the thermoplastic nonmetallic fiber prepreg comprises at least one of unidirectional tape, plain weave, twill weave and satin weave.
In this embodiment, the non-metal fibers are mutually restricted after braiding, and the deformation amount generated after heating is small, so that the deformation of the thermoplastic non-metal fiber prepreg can be reduced, the processing precision is improved, and the appearance defect is reduced, and on the other hand, the toughness of the thermoplastic non-metal fiber prepreg can be improved due to the fact that the non-metal fibers are braided.
Optionally, the thermoplastic composite has a thickness of 0.2-2mm.
In the embodiment, the thickness of the shell surface is too small, the strength is insufficient, deformation is easy to occur in the processing and using processes, the appearance reject ratio is increased, and the processing difficulty is high; if the thickness of the shell surface is too large, the product is not easy to develop in light and thin, and therefore, the thickness of the shell surface should be as thin as possible while ensuring sufficient strength and excellent appearance. The thickness of the shell surface is thus determined to be 0.2-2mm, e.g. 0.2mm, 0.5mm, 1.0mm, 1.5mm, 2.0mm etc.
Illustratively, the step S10 includes: obtaining a thermoplastic nonmetallic fiber prepreg of a prepared or commercially available finished product, placing the thermoplastic nonmetallic fiber prepreg in a cavity of the die, and carrying out infrared heating plasticization on the thermoplastic nonmetallic fiber prepreg to soften the thermoplastic nonmetallic fiber prepreg, wherein the technological conditions of the infrared heating plasticization can be determined according to actual needs, experimental test results and the like, and the embodiment is not limited to the above.
Optionally, the temperature of the infrared heating is 300-600 ℃, and the time of the infrared heating is 10-100s.
In this embodiment, the temperature and time of the infrared heating should be such that the thermoplastic nonmetallic fiber prepreg is plasticized, but if the temperature is too high or the time is too long, the strength of the thermoplastic nonmetallic fiber prepreg is lowered, so that the temperature of the infrared heating is determined to be 300-600 ℃, such as 300 ℃, 400 ℃, 500 ℃, 600 ℃, etc., and the time of the infrared heating is determined to be 10-100s, such as 10s, 20s, 40s, 60s, 80s, 100s, etc.
And S20, closing the mold, and performing compression molding on the plasticized thermoplastic nonmetallic fiber prepreg to obtain the thermoplastic composite material.
In this embodiment, it should be noted that, in the mold closing process, the thermoplastic nonmetallic fiber prepreg is deformed gradually until the shape of the thermoplastic nonmetallic fiber prepreg is the same as that of the mold, and before the mold is completely closed, the thermoplastic nonmetallic fiber prepreg needs to have a higher temperature and be in a softened state to better complete the compression molding, and after the thermoplastic nonmetallic fiber prepreg completely fills the mold cavity, the mold temperature is reduced, so that the thermoplastic nonmetallic fiber prepreg is cured, and the mold release is realized. When the mold is closed, the thermoplastic nonmetallic fiber prepreg is in a softened state, the temperature is usually higher, for example, the temperature of the thermoplastic nonmetallic fiber prepreg is 200-300 ℃, if the mold temperature is lower, for example, the mold temperature is 40-120 ℃, when the mold is contacted with the thermoplastic nonmetallic fiber prepreg, the thermoplastic nonmetallic fiber prepreg is suddenly cooled, deformation can occur to cause poor appearance, if the mold temperature is increased, after the subsequent compression molding, the molded thermoplastic nonmetallic fiber prepreg can be solidified by cooling the mold, the temperature is repeatedly increased and reduced, the energy consumption is higher, the time is longer, and the processing efficiency is reduced. If the mold disclosed in the above embodiment of the present application is adopted, even if the temperature of the mold is low, for example, the mold temperature is 40-120 ℃, because the surface of the mold cavity contacting with the thermoplastic nonmetallic fiber prepreg is a heat insulation material, the heat conduction speed of two sides of the heat insulation material is low, the heat dissipation of the thermoplastic nonmetallic fiber prepreg can be effectively slowed down, so that the cooling speed of the thermoplastic nonmetallic fiber prepreg can be reduced, the thermoplastic nonmetallic fiber prepreg is in a softened state before completely filling the mold cavity, and is reduced to below the vitrification conversion temperature after completely filling the mold cavity, the appearance reject ratio is reduced, repeated heating and cooling are not required, the energy consumption can be effectively reduced, and the processing efficiency is improved.
Illustratively, the step S20 includes: and closing the mold, and enabling the plasticized thermoplastic nonmetallic fiber prepreg to be covered in the cavity of the mold under the action of pressure to realize compression molding, so as to obtain the thermoplastic composite material, wherein the process conditions of the compression molding can be determined according to actual needs, experimental test results and the like, and the embodiment is not limited to the above.
Optionally, the mold temperature of the compression molding is 40-120 ℃, and the pressure of the compression molding is 20-180kgf/cm 2 The compression molding time is 0.5-5min.
In this embodiment, the molding process conditions can soften the resin in the thermoplastic nonmetallic fiber prepreg and deform with the shape of the mold, and the temperature of the mold can be as low as possible while avoiding deformation of the thermoplastic nonmetallic fiber prepreg due to temperature differences, so that the molding can be performed quickly after the molding. Thus, it was confirmed that the mold temperature of the compression molding was 40 to 120℃such as 40℃60℃80℃100℃120℃and the pressure of the compression molding was 20 to 180kgf/cm 2 For example, 20kgf/cm 2 、50kgf/cm 2 、100kgf/cm 2 、150kgf/cm 2 、180kgf/cm 2 Etc.; the molding time is 0.5-5min, such as 0.5min, 1min, 2min, 3min, 4min, 5min, etc.
In this embodiment, by processing the thermoplastic composite material by using the mold with the heat-insulating material on the surface of the mold cavity, the cooling speed of the thermoplastic nonmetallic fiber prepreg can be reduced without repeatedly heating and cooling the mold, and only the mold with a lower temperature is required to be used for compression molding, so that the thermoplastic nonmetallic fiber prepreg is in a softened state before completely filling the mold cavity, and is reduced to below the vitrification conversion temperature after completely filling the mold cavity, the appearance reject ratio is reduced, and the energy consumption can be effectively reduced and the processing efficiency is improved because repeated heating and cooling are not required.
Further, the invention also provides a thermoplastic composite material, which is processed by the thermoplastic composite material processing method.
The shell solves the technical problem that the appearance reject ratio of the thermoplastic composite material in the related technology is high. Compared with the prior art, the beneficial effects of the shell provided by the embodiment of the invention are the same as those of the thermoplastic composite material processing method of the embodiment, and are not repeated here.
Further, the invention also provides an electronic device comprising the thermoplastic composite material as described above.
In one implementation, the electronic device may be a head mounted display device, a smart wearable device, or the like, such as VR/AR glasses, VR/AR helmets, or the like.
The electronic equipment solves the technical problem that the appearance reject ratio of the thermoplastic composite material in the related technology is high. Compared with the prior art, the beneficial effects of the electronic equipment provided by the embodiment of the invention are the same as those of the thermoplastic composite material of the embodiment, and are not repeated here.
The thermoplastic composite of the present invention is described in detail below with specific examples and comparative examples. It is to be understood that the following description is exemplary only and is not intended to limit the invention in any way.
Example 1
A0.2 mm thermoplastic carbon fiber prepreg is selected as a base material, wherein thermoplastic resin in the thermoplastic carbon fiber prepreg is transparent polycarbonate, and a fiber weaving mode is plain weave.
Spraying a nano zirconia heat-insulating coating with the thickness of 0.5mm on the surface of the metal mold core to manufacture a first mold core, wherein the second mold core is the metal mold core.
Controlling the temperature of the first die core and the second die core to be 100 ℃, cutting the thermoplastic carbon fiber prepreg into the size of a product, placing the product into the second die core, and heating the thermoplastic carbon fiber prepreg by infraredPlasticizing, wherein the infrared heating temperature is 450 ℃, the plasticizing time is 40s, after plasticizing, the first die core and the second die core are assembled, compression molding is carried out, and the compression molding pressure is 30kgf/cm 2 The compression molding time is 1min, and the thermoplastic composite material is obtained.
Example 2
The method comprises the steps of selecting 0.5mm thermoplastic carbon fiber prepreg as a base material, wherein thermoplastic resin in the thermoplastic carbon fiber prepreg is polypropylene, and the fiber weaving mode is twill.
The first mold core is made of glass fiber thermosetting composite material, and the second mold core is made of metal material.
Cutting the thermoplastic carbon fiber prepreg into products with the sizes by controlling the temperature of the first die core and the second die core to be 40 ℃, placing the products in the second die core, heating the thermoplastic carbon fiber prepreg by infrared to plasticize, wherein the infrared heating temperature is 300 ℃, the plasticization time is 10s, after plasticization, closing the dies of the first die core and the second die core, and carrying out compression molding with the compression molding pressure of 20kgf/cm 2 The compression molding time is 0.5min, and the thermoplastic composite material is obtained.
Example 3
2mm thermoplastic carbon fiber prepreg is selected as a base material, wherein thermoplastic resin in the thermoplastic carbon fiber prepreg is polyimide, and the fiber weaving mode is unidirectional tape.
And bonding polyimide heat insulation adhesive tape on the surface of the metal mold core to manufacture a first mold core, wherein the second mold core is the metal mold core.
Cutting the thermoplastic carbon fiber prepreg into products with the sizes by controlling the temperature of the first die core and the second die core to be 120 ℃, placing the products in the second die core, heating the thermoplastic carbon fiber prepreg by infrared to plasticize, wherein the infrared heating temperature is 600 ℃, the plasticization time is 100s, after plasticization, closing the dies of the first die core and the second die core, and carrying out compression molding with the compression molding pressure of 180kgf/cm 2 The compression molding time is 5min, and the thermoplastic composite material is obtained.
Comparative example
A0.2 mm thermoplastic carbon fiber prepreg is selected as a base material, wherein thermoplastic resin in the thermoplastic carbon fiber prepreg is transparent polycarbonate, and a fiber weaving mode is plain weave.
The first die core and the second die core are metal die cores.
Cutting the thermoplastic carbon fiber prepreg into products with the sizes by controlling the temperature of the first die core and the second die core to be 100 ℃, placing the products in the second die core, heating the thermoplastic carbon fiber prepreg by infrared to plasticize, wherein the infrared heating temperature is 450 ℃, the plasticization time is 40s, after plasticization, closing the dies of the first die core and the second die core, and carrying out compression molding with the compression molding pressure of 30kgf/cm 2 The compression molding time is 1min, and the thermoplastic composite material is obtained.
The thermoplastic composites processed in the examples and comparative examples were subjected to product appearance state recording, wherein the test results are shown in table 1 and the microscopic photographs of the surfaces of the thermoplastic composites are shown in fig. 3 to 6.
TABLE 1
Compared with the comparative example, the thermoplastic composite material processed by the mold with the heat insulating material on the surface of the mold cavity has smoother appearance, and the heat dissipation speed is slowed down, so that the temperature of the mold is not required to be continuously increased and reduced in one-time preparation process, the processing technology can be simplified, the energy consumption is saved, and the processing cost is reduced.
The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the scope of the claims, and all equivalent structures or equivalent processes using the descriptions and drawings of the present application, or direct or indirect application in other related technical fields are included in the scope of the claims.
Claims (7)
1. A method of processing a thermoplastic composite material, the method comprising the steps of:
placing the thermoplastic nonmetallic fiber prepreg in a second die core of a die, and carrying out infrared heating plasticization on the thermoplastic nonmetallic fiber prepreg; wherein the temperature of the infrared heating is 300-600 ℃; the mold is a compression molding mold of a thermoplastic composite material, the thermoplastic composite material comprises thermoplastic resin and nonmetal fibers, the mold comprises a first mold core and a second mold core, the first mold core is made of a heat insulation material, the second mold core is made of metal, the heat insulation material comprises at least one of a thermosetting glass fiber composite material and a thermosetting carbon fiber composite material, and the heat conductivity coefficient of the heat insulation material is less than or equal to 1W/(m.K);
and (3) die closing, and performing compression molding on the plasticized thermoplastic nonmetallic fiber prepreg to obtain the thermoplastic composite material, wherein the temperature of the die for compression molding is 40-120 ℃ and the temperature of the thermoplastic nonmetallic fiber prepreg is 200-300 ℃ during die closing.
2. The method of processing a thermoplastic composite material according to claim 1, wherein the infrared heating time is 10 to 100 seconds;
and/or the pressure of the compression molding is 20-180kgf/cm 2 The compression molding time is 0.5-5min.
3. The method of processing a thermoplastic composite material of claim 1, wherein the thermoplastic nonmetallic fiber prepreg comprises a thermoplastic resin and nonmetallic fibers; wherein the nonmetallic fiber comprises at least one of a carbon fiber and a glass fiber; the thermoplastic resin includes at least one of polypropylene, polyimide, nylon, polycarbonate, polyurethane, polyether ether ketone, and polyphenylene sulfide.
4. The method of claim 1, wherein the fibers in the thermoplastic nonmetallic fiber prepreg are woven, and the manner of weaving the fibers in the thermoplastic nonmetallic fiber prepreg comprises at least one of unidirectional tape, plain, twill, and satin.
5. The method of processing a thermoplastic composite material of claim 1, wherein the thermoplastic composite material has a thickness of 0.2 to 2mm.
6. A thermoplastic composite material, characterized in that it is processed by the thermoplastic composite material processing method according to any one of claims 1-5.
7. An electronic device comprising the thermoplastic composite of claim 6.
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