CN116021671B - Preparation method of non-orthogonal thermoplastic laminated plate - Google Patents
Preparation method of non-orthogonal thermoplastic laminated plate Download PDFInfo
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- CN116021671B CN116021671B CN202310074592.0A CN202310074592A CN116021671B CN 116021671 B CN116021671 B CN 116021671B CN 202310074592 A CN202310074592 A CN 202310074592A CN 116021671 B CN116021671 B CN 116021671B
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- 229920001169 thermoplastic Polymers 0.000 title claims abstract description 106
- 239000004416 thermosoftening plastic Substances 0.000 title claims abstract description 106
- 238000002360 preparation method Methods 0.000 title abstract description 12
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 26
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 26
- 238000000465 moulding Methods 0.000 claims abstract description 23
- 239000011347 resin Substances 0.000 claims abstract description 21
- 229920005989 resin Polymers 0.000 claims abstract description 21
- 238000004073 vulcanization Methods 0.000 claims abstract description 21
- 238000005056 compaction Methods 0.000 claims description 22
- 239000003795 chemical substances by application Substances 0.000 claims description 19
- 238000010438 heat treatment Methods 0.000 claims description 13
- 239000004814 polyurethane Substances 0.000 claims description 12
- 229920002635 polyurethane Polymers 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 11
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 7
- 229920002292 Nylon 6 Polymers 0.000 claims description 7
- 239000004917 carbon fiber Substances 0.000 claims description 7
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 7
- 238000005520 cutting process Methods 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000004321 preservation Methods 0.000 claims description 5
- 238000005498 polishing Methods 0.000 claims description 4
- 238000007711 solidification Methods 0.000 claims description 4
- 230000008023 solidification Effects 0.000 claims description 4
- 239000006082 mold release agent Substances 0.000 claims 2
- 238000007731 hot pressing Methods 0.000 abstract description 4
- 239000002131 composite material Substances 0.000 description 13
- 239000000835 fiber Substances 0.000 description 10
- 239000011159 matrix material Substances 0.000 description 9
- 238000003825 pressing Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 238000009863 impact test Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000010923 batch production Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T50/00—Aeronautics or air transport
- Y02T50/40—Weight reduction
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- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
The invention provides a preparation method of a non-orthogonal thermoplastic laminated plate, wherein when an orthogonal thermoplastic prepreg is stretched, two aluminum plates with the same shape and size as the orthogonal thermoplastic prepreg are prepared, and the two aluminum plates are respectively arranged on the upper side and the lower side of the orthogonal thermoplastic prepreg, so that the aluminum plates can prevent the problem of temperature difference caused by the fact that the orthogonal thermoplastic prepreg cannot be contacted with an upper hot pressing plate and a lower hot pressing plate of an electric vulcanization molding machine. The temperature of the orthogonal thermoplastic prepreg during stretching can be precisely controlled, resin volatilization is reduced, prepreg is prevented from being cured in advance, mechanical properties of the non-orthogonal thermoplastic laminated plate are improved, one-step stretch forming can be realized during stretching, and preparation efficiency is improved.
Description
Technical Field
The invention belongs to the field of materials, relates to a fiber reinforced resin matrix composite material, and in particular relates to a preparation method of a non-orthogonal thermoplastic laminated plate.
Background
The fiber reinforced resin matrix composite material is a composite material with fibers as reinforcements and resin as a matrix. The fiber reinforced resin matrix composite has the characteristics of small density, high specific strength, high specific modulus, noise reduction, vibration reduction, easy forming and suitability for manufacturing complex parts, and is widely applied to the fields of aerospace, military, traffic and the like.
When the fiber reinforced resin matrix composite is applied in the aviation field, the fiber reinforced resin matrix composite is used as an aviation composite structural member, and the fiber reinforced resin matrix composite is likely to be impacted by sand stones, hail, raindrops and other objects at a low speed in the actual service process, so that damage is caused. The damage caused under the low-speed low-energy impact condition has a huge potential safety hazard, because the fiber reinforced resin matrix composite material is often damaged on the surface very little at the moment, but the damage such as microcracks, layering and the like is formed in the fiber reinforced resin matrix composite material, the internal damage is difficult to be found in time, but the damage can lead to the decline of the mechanical property of the material and the final failure, and serious consequences are caused. To solve this problem, non-orthogonal fiber woven thermoplastic composites have been further developed and made into non-orthogonal thermoplastic laminates for use. By researching the mechanical behavior of the non-orthogonal thermoplastic laminated plate during low-speed impact damage, prediction and safety guarantee can be provided for the service behavior of the composite structural member.
When the non-orthogonal thermoplastic laminated plate is prepared, the orthogonal thermoplastic prepreg is required to be heated and stretched into the non-orthogonal prepreg, the resin in the orthogonal thermoplastic prepreg is sensitive to temperature, but the existing preparation method has temperature difference between the actual temperature sensed by the orthogonal thermoplastic prepreg and the ideal temperature in the preparation process, and the temperature difference can have great influence on the mechanical property of the final laminated plate, because when the actual temperature exceeds the ideal temperature, the resin in the orthogonal thermoplastic prepreg volatilizes and even carbonizes, the volatilized gas of the resin is toxic and the volatilization or carbonization of the resin can have a certain influence on the mechanical property of the non-orthogonal thermoplastic laminated plate; when the actual temperature is lower than the desired temperature, the orthorhombic thermoplastic prepreg is rapidly cured, and is difficult to be stretched to a predetermined stretching angle, thereby affecting the performance of the non-orthorhombic thermoplastic laminate.
Disclosure of Invention
The present invention has been made in view of the above-mentioned problems occurring in the prior art, and an object of the present invention is to provide a method for producing a non-orthogonal thermoplastic laminate capable of improving the mechanical properties of the laminate.
The technical scheme adopted for solving the technical problems is as follows:
a method of making a non-orthogonal thermoplastic laminate comprising the steps of:
step 1, cutting an orthogonal thermoplastic prepreg into a shape and a size which are matched with those of a photo frame clamp, clamping the orthogonal thermoplastic prepreg in the photo frame clamp, and placing the photo frame clamp in an electric vulcanization molding machine; preparing two aluminum plates with the same shape and size as the orthogonal thermoplastic prepreg, respectively placing the two aluminum plates on the upper side and the lower side of the orthogonal thermoplastic prepreg, heating and preserving heat by an electric vulcanization molding machine, stretching the orthogonal thermoplastic prepreg to a preset angle theta, and then cooling to room temperature to obtain the non-orthogonal thermoplastic prepreg;
Step 2, cutting the non-orthogonal thermoplastic prepreg into a preset shape and size;
Step 3, stacking and tiling a plurality of non-orthogonal thermoplastic prepregs in a compaction mould, placing the compaction mould in an electric vulcanization molding machine, prepressing, preserving heat, continuously pressurizing and preserving heat for compaction and solidification, cooling the compaction mould to room temperature, and demoulding to obtain the non-orthogonal thermoplastic laminated plate;
and 4, polishing the non-orthogonal thermoplastic laminated plate, and removing burrs and flashes.
Further, in the step 1, the heating temperature of the electric vulcanizing and forming machine is 220-230 ℃ and the heat preservation time is 5-10 minutes.
Further, the pre-pressing and heat preservation in the step 3 are carried out, and the continuous pressurizing and heat preservation process is as follows: heating to 200-250 deg.c in an electric sulfurizing shaper under 0.1-0.3 MPa, maintaining for 5-10 min, pressurizing to 0.7-1MPa, and pressurizing for 20-30 min for compaction and solidification.
Further, the orthogonal thermoplastic prepreg is a continuous carbon fiber reinforced nylon 6 resin based orthogonal weave prepreg.
Furthermore, the photo frame clamp in the step 1 and the compacting die in the step 2 are both coated with release agents, and the surfaces of the two aluminum plates in the step 1, which are used for being contacted with the orthogonal thermoplastic prepreg, are both coated with release agents.
Further, the release agent is a polyurethane release agent.
Further, the shape of the frame fixture in the step 1 is cross-shaped.
Further, the preset angle θ in the step 1 is 0 ° to 90 °.
Further, the thickness of the aluminum plate in the step 1 is 6-10mm.
The beneficial effects of the invention are as follows:
According to the preparation method provided by the invention, when the orthogonal thermoplastic prepreg is stretched, two aluminum plates with the same shape and size as the orthogonal thermoplastic prepreg are prepared, and the two aluminum plates are respectively placed on the upper side and the lower side of the orthogonal thermoplastic prepreg, so that the aluminum plates can prevent the problem of temperature difference caused by the fact that the orthogonal thermoplastic prepreg cannot be contacted with the upper hot pressing plate and the lower hot pressing plate of the electric vulcanization molding machine. The temperature of the orthogonal thermoplastic prepreg during stretching can be precisely controlled, resin volatilization is reduced, prepreg is prevented from being cured in advance, mechanical properties of the non-orthogonal thermoplastic laminated plate are improved, one-step stretch forming can be realized during stretching, and preparation efficiency is improved.
Furthermore, the photo frame clamp in the step 1 and the compacting die in the step 2 are both coated with the release agent, and the surfaces of the two aluminum plates in the step 1, which are used for being contacted with the orthogonal thermoplastic prepreg, are both coated with the release agent, so that the prepreg can be prevented from being adhered to the aluminum plates or the clamp by the release agent.
Drawings
FIG. 1 is a flow chart of a preparation method;
FIG. 2 is a schematic view of cut size and aluminum plate size;
FIG. 3 is a schematic view of the overall structure of a compaction tool;
FIG. 4 is a side cross-sectional view of a compaction tool;
FIG. 5 is an isometric view of a photo frame fixture used in the present invention;
The corresponding names of the reference numerals in the drawings are as follows: 1-male die and 2-female die.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
The invention will be further described with reference to the drawings and the specific examples.
As shown in fig. 1, the principle of the present invention is to heat the orthorhombic thermoplastic prepreg, stretch the orthorhombic thermoplastic prepreg by a photo frame fixture to form the non-orthorhombic thermoplastic prepreg, then laminate and lay the non-orthorhombic thermoplastic prepreg cut into a predetermined size in a compaction mold, and heat, pressure and cure the laminate to form the non-orthorhombic thermoplastic laminate.
The preparation method provided by the invention specifically comprises the following steps:
Step 1, cutting the continuous carbon fiber reinforced nylon 6 resin-based orthogonal woven thermoplastic prepreg into a cross shape as shown in fig. 2. Polyurethane release agent is uniformly smeared inside the photo frame clamp, and the orthogonal thermoplastic prepreg is clamped in the photo frame clamp and placed in an electric vulcanization molding machine. Two aluminum plates with the same shape and size as the orthogonal thermoplastic prepreg and 6mm thickness are prepared, the two aluminum plates are respectively placed on the upper side and the lower side of the orthogonal thermoplastic prepreg, and polyurethane release agents are uniformly smeared on the surfaces of the two aluminum plates, which are used for being contacted with the orthogonal thermoplastic prepreg. Heating an electric vulcanization molding machine to 220-230 ℃, preserving heat for 5 minutes, stretching the orthogonal thermoplastic prepreg to a preset angle theta, wherein the preset angle theta is 0-90 degrees, and then cooling to room temperature to obtain the non-orthogonal thermoplastic prepreg. Wherein, the product number of the carbon fiber is T300-3000K, the product number of the nylon 6 is YH, the product specification is YH-800, and the model of the electric vulcanization molding machine is ZS-407DP-30-400.
Step 2, cutting the non-orthogonal thermoplastic prepreg into a rectangle with the size of 125mm multiplied by 75mm.
And 3, uniformly coating polyurethane release agent in the compacting mold shown in fig. 3 and 4, wherein the compacting mold comprises a male mold 1 and a female mold 2. Laminating and tiling a plurality of non-orthogonal thermoplastic prepregs in a compacting mold, placing the compacting mold in an electric vulcanizing molding machine of an electric vulcanizing molding machine, heating to 240 ℃ with a pre-pressing pressure of 0.1Mpa, preserving heat for 4 minutes, continuously pressurizing to 1Mpa for 20 minutes, compacting and solidifying, cooling the compacting mold to room temperature, and demolding to obtain the non-orthogonal thermoplastic laminated plate;
and 4, polishing the non-orthogonal thermoplastic laminated plate in a polishing machine to remove burrs and flashes, wherein the size of the non-orthogonal thermoplastic laminated plate is 125mm multiplied by 75mm, and the thickness of the non-orthogonal thermoplastic laminated plate is 2.72mm.
Example 1
The continuous carbon fiber reinforced nylon 6 resin based orthogonal weave thermoplastic prepreg was cut into a cross shape as shown in fig. 2. Polyurethane release agent is uniformly smeared inside the photo frame clamp, and the orthogonal thermoplastic prepreg is clamped in the photo frame clamp and placed in an electric vulcanization molding machine. Two aluminum plates with the same shape and size as the orthogonal thermoplastic prepreg and 6mm thickness are prepared, the two aluminum plates are respectively placed on the upper side and the lower side of the orthogonal thermoplastic prepreg, and polyurethane release agents are uniformly smeared on the surfaces of the two aluminum plates, which are used for being contacted with the orthogonal thermoplastic prepreg. And heating the electric vulcanization molding machine to 220-230 ℃, preserving heat for 5 minutes, stretching the orthogonal thermoplastic prepreg to a preset angle of 60 degrees, and then cooling to room temperature to obtain the non-orthogonal thermoplastic prepreg. The non-orthogonal thermoplastic prepreg was cut into rectangles of 125mm x 75mm in size. Polyurethane release agent is uniformly coated in the compacting mold shown in fig. 3 and 4, and the compacting mold comprises a male mold 1 and a female mold 2. And (3) stacking and tiling a plurality of non-orthogonal thermoplastic prepregs in a compaction mould, placing the compaction mould in an electric vulcanization molding machine of an electric vulcanization molding machine, heating to 240 ℃ with a pre-pressing pressure of 0.1Mpa, preserving heat for 4 minutes, continuously pressurizing to 1Mpa for 20 minutes, compacting and solidifying, cooling the compaction mould to room temperature, and demolding to obtain the non-orthogonal thermoplastic laminated plate. 6 replicates were performed to obtain 6 blocks of 60℃non-orthogonal thermoplastic laminate.
Example 2
The continuous carbon fiber reinforced nylon 6 resin based orthogonal weave thermoplastic prepreg was cut into a cross shape as shown in fig. 2. Polyurethane release agent is uniformly smeared inside the photo frame clamp, and the orthogonal thermoplastic prepreg is clamped in the photo frame clamp and placed in an electric vulcanization molding machine. Two aluminum plates with the same shape and size as the orthogonal thermoplastic prepreg and 6mm thickness are prepared, the two aluminum plates are respectively placed on the upper side and the lower side of the orthogonal thermoplastic prepreg, and polyurethane release agents are uniformly smeared on the surfaces of the two aluminum plates, which are used for being contacted with the orthogonal thermoplastic prepreg. And heating the electric vulcanization molding machine to 220-230 ℃, preserving heat for 5 minutes, stretching the orthogonal thermoplastic prepreg to a preset angle of 75 degrees, and then cooling to room temperature to obtain the non-orthogonal thermoplastic prepreg. The non-orthogonal thermoplastic prepreg was cut into rectangles of 125mm x 75mm in size. Polyurethane release agent is uniformly coated in the compacting mold shown in fig. 3 and 4, and the compacting mold comprises a male mold 1 and a female mold 2. And (3) stacking and tiling a plurality of non-orthogonal thermoplastic prepregs in a compaction mould, placing the compaction mould in an electric vulcanization molding machine of an electric vulcanization molding machine, heating to 240 ℃ with a pre-pressing pressure of 0.1Mpa, preserving heat for 4 minutes, continuously pressurizing to 1Mpa for 20 minutes, compacting and solidifying, cooling the compaction mould to room temperature, and demolding to obtain the non-orthogonal thermoplastic laminated plate. 6 replicates were performed to obtain 6 blocks of 75℃non-orthogonal thermoplastic laminate.
Comparative example
The continuous carbon fiber reinforced nylon 6 resin based orthogonal woven thermoplastic prepreg was cut into a rectangle with dimensions 125mm x 75mm. Polyurethane release agent is uniformly coated in the compacting mold shown in fig. 3 and 4, and the compacting mold comprises a male mold 1 and a female mold 2. And (3) stacking and tiling a plurality of non-orthogonal thermoplastic prepregs in a compaction mould, placing the compaction mould in an electric vulcanization molding machine of an electric vulcanization molding machine, heating to 240 ℃ with a pre-pressing pressure of 0.1Mpa, preserving heat for 4 minutes, continuously pressurizing to 1Mpa for 20 minutes, compacting and solidifying, cooling the compaction mould to room temperature, and demolding to obtain the non-orthogonal thermoplastic laminated plate. The above-mentioned steps were repeated 6 times to obtain 6 blocks of the orthogonal thermoplastic laminate.
The woven thermoplastic composite samples prepared in examples 1, 2, 3 were subjected to low speed impact testing using an Instron Dynatup 9250HV drop hammer impact tester according to ASTM D7136 standard with a ram weight of 5.607kg. Two sets of energy (5J, 10J) low-speed impact tests were performed, and the prepreg cut size (125 mm. Times.75 mm) was determined by the low-speed impact test equipment.
Table 1 table of impact test data
Note that: the data in the tables are all the average of three tests.
From the data in Table 1, it was found that the maximum impact force applied to the laminate in examples 1 and 2 was 47% and 17.6% higher, respectively, for the comparative examples when the laminate was subjected to an energy of 5J; the maximum impact force of the laminated plate when the laminated plate is impacted by 10J energy is 40% and 16% higher for the comparative examples in the example 1 and the example 2 respectively; the back impact damage areas of the laminated plate are respectively enlarged by 93.75% and 70% relative to the comparative examples in the example 1 and the example 2 after the laminated plate is impacted by 10J, which is more beneficial to the transmission and diffusion of the load after the laminated plate is impacted. Therefore, the laminated board prepared by the method provided by the invention has better mechanical properties, and the yield can be improved during large-scale batch production, so that the preparation efficiency is improved.
Claims (9)
1. A method of making a non-orthogonal thermoplastic laminate comprising the steps of:
step 1, cutting an orthogonal thermoplastic prepreg into a shape and a size which are matched with those of a photo frame clamp, clamping the orthogonal thermoplastic prepreg in the photo frame clamp, and placing the photo frame clamp in an electric vulcanization molding machine; preparing two aluminum plates with the same shape and size as the orthogonal thermoplastic prepreg, respectively placing the two aluminum plates on the upper side and the lower side of the orthogonal thermoplastic prepreg, heating and preserving heat by an electric vulcanization molding machine, stretching the orthogonal thermoplastic prepreg to a preset angle theta, and then cooling to room temperature to obtain the non-orthogonal thermoplastic prepreg;
Step 2, cutting the non-orthogonal thermoplastic prepreg into a preset shape and size;
Step 3, stacking and tiling a plurality of non-orthogonal thermoplastic prepregs in a compaction mould, placing the compaction mould in an electric vulcanization molding machine, prepressing, preserving heat, continuously pressurizing and preserving heat for compaction and solidification, cooling the compaction mould to room temperature, and demoulding to obtain the non-orthogonal thermoplastic laminated plate;
and 4, polishing the non-orthogonal thermoplastic laminated plate, and removing burrs and flashes.
2. The method of producing a non-orthogonal thermoplastic laminate according to claim 1, wherein: in the step 1, the heating temperature of the electric vulcanizing and forming machine is 220-230 ℃ and the heat preservation time is 5-10 minutes.
3. The method of producing a non-orthogonal thermoplastic laminate according to claim 1, wherein: in the step 3, prepressing and heat preservation are carried out, the continuous pressurizing and heat preserving process is as follows: heating to 200-250 deg.c in an electric sulfurizing shaper under 0.1-0.3 MPa, maintaining for 5-10 min, pressurizing to 0.7-1MPa, and pressurizing for 20-30 min for compaction and solidification.
4. The method of producing a non-orthogonal thermoplastic laminate according to claim 1, wherein: the orthogonal thermoplastic prepreg is a continuous carbon fiber reinforced nylon 6 resin-based orthogonal woven prepreg.
5. The method according to any one of claims 1 to 4, wherein the photo frame jig in step 1 and the compacting die in step 2 are each coated with a release agent, and the surfaces of the two aluminum plates in step 1 for contact with the orthorhombic thermoplastic prepreg are each coated with a release agent.
6. The method of producing a non-orthogonal thermoplastic laminate according to claim 5, wherein the mold release agent is a polyurethane mold release agent.
7. The method of claim 5, wherein the shape of the frame fixture in step 1 is cross-shaped.
8. The method of producing a non-orthogonal thermoplastic laminate according to claim 5, wherein the predetermined angle θ in step 1 is 0 ° to 90 °.
9. The method for producing a non-orthogonal thermoplastic laminated plate according to claim 5, wherein the thickness of the aluminum plate in the step 1 is 6 to 10mm.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101597417A (en) * | 2008-06-05 | 2009-12-09 | 中国科学院化学研究所 | Epoxy matrix resin of a kind of high heat-resisting high tenacity and preparation method thereof and application |
| CN104441697A (en) * | 2014-11-17 | 2015-03-25 | 上海飞机制造有限公司 | Performing method of composite material C-shaped component |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2016179647A (en) * | 2015-03-25 | 2016-10-13 | 東レ株式会社 | Method for producing fiber-reinforced plastic |
| WO2016208450A1 (en) * | 2015-06-25 | 2016-12-29 | 健二 久保村 | Deep drawing-processable prepreg and method for producing same |
| CN110001087A (en) * | 2019-04-28 | 2019-07-12 | 燕山大学 | A kind of carbon fiber plate preparation facilities and method |
| CN113757488B (en) * | 2021-09-08 | 2023-07-07 | 巩义市泛锐熠辉复合材料有限公司 | Prepreg type pipeline heat preservation device, construction method and construction equipment thereof |
| CN114193792A (en) * | 2021-12-07 | 2022-03-18 | 江苏奕通复合材料有限公司 | Halogen-free flame-retardant continuous fiber reinforced thermoplastic battery cover plate and preparation method thereof |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101597417A (en) * | 2008-06-05 | 2009-12-09 | 中国科学院化学研究所 | Epoxy matrix resin of a kind of high heat-resisting high tenacity and preparation method thereof and application |
| CN104441697A (en) * | 2014-11-17 | 2015-03-25 | 上海飞机制造有限公司 | Performing method of composite material C-shaped component |
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