CN115674797A - Bio-based polyamide composite board and preparation method and application thereof - Google Patents
Bio-based polyamide composite board and preparation method and application thereof Download PDFInfo
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Abstract
The invention discloses a bio-based polyamide composite board and a preparation method and application thereof. The bio-based polyamide composite board comprises a first surface layer, a middle layer and a second surface layer; the first surface layer, the middle layer and the second surface layer are sequentially stacked; the first surface layer and the second surface layer are long carbon chain polyamide resin unidirectional prepreg tapes, and the middle layer comprises a bio-based polyamide film and fiber cloth. The composite board compression molding ensures the processing rate and the efficient molding of the board, improves the mechanical property and the thermal deformation temperature of the composite board, reduces the water absorption rate of the composite board, has light overall weight, and meets the requirement of lightweight boards.
Description
The application claims 2021/7/28, entitled bio-based polyamide composite board and its preparation method and application, chinese patent application 202110854375.4, and application claims 2021/7/28, entitled bio-based polyamide composite board, priority of 202121728585.0. The present application refers to the above-mentioned chinese patent application in its entirety.
Technical Field
The invention relates to a bio-based polyamide composite board and a preparation method and application thereof.
Background
The composite material plays an important role in many fields and also replaces many traditional materials. The forming process of the composite material mainly comprises winding forming, laying forming, compression molding, autoclave forming, resin transfer molding forming and the like. The composite forming process generally involves two stages, first deforming or flowing the raw material at a temperature and pressure to obtain the desired shape, and then trying to maintain its shape. Different forming methods can be selected according to different raw materials. The compression molding method is relatively simple and efficient. The compression molding process of the composite material mainly comprises the following steps: the design of a forming die, the design of a layering layer, the forming of a composite material component, the compression molding process characteristics, factors influencing the quality of a molded product and the like.
The plate prepared by the composite material through compression molding is applied to various fields. The existing thermosetting composite board is prepared by curing epoxy resin, so that the curing time is long, the glass fiber content is low, and the composite board cannot be recycled. The common thermoplastic material composite board has the characteristics of water absorption, high strength, low strength and the like. Therefore, in order to adapt the polyamide composite board to more complicated use occasions, widen the use temperature, reduce the water absorption influence and increase the light weight, it is necessary to design and develop a composite board with high strength, high heat distortion temperature and low water absorption rate.
Disclosure of Invention
The invention provides a bio-based polyamide composite board and a preparation method and application thereof, aiming at improving the performance of the existing polyamide composite board and widening the use scene. According to the bio-based polyamide composite board, the bio-based polyamide film, the fiber cloth and the bio-based polyamide unidirectional prepreg tape are subjected to compression molding, the processing rate and the efficient molding of the board are ensured, the mechanical property and the thermal deformation temperature of the composite board are improved, the water absorption rate of the composite board is reduced, the overall weight is light, and the requirement of lightweight boards is met.
The relative viscosity of the invention is measured by a Ubbelohde viscometer concentrated sulfuric acid method (96 percent). The biobased content is determined by carbon 14, for example by biobased content test standard method ASTM D6866.
In order to achieve the purpose, the invention adopts the following technical scheme:
one of the technical schemes is as follows: a bio-based polyamide composite board comprises a first surface layer, a middle layer and a second surface layer; the first surface layer, the middle layer and the second surface layer are sequentially stacked; the first surface layer and the second surface layer are long carbon chain polyamide resin unidirectional prepreg tapes, and the middle layer comprises a bio-based polyamide film and fiber cloth.
Long carbon chain polyamide resin unidirectional prepreg tape:
in some specific embodiments, the long carbon chain polyamide resin unidirectional prepreg tape is a continuous long fiber reinforced long carbon chain polyamide resin unidirectional prepreg tape comprising a continuous long fiber and a bio-based long carbon chain polyamide 5X resin; the mass percentage of the continuous long fibers is 40 to 80%, more preferably 60 to 70%, for example 32.8%, and the mass percentage is the mass of the continuous long fibers in the mass of the prepreg tape.
In some specific embodiments, the bio-based long carbon chain polyamide 5X resin is selected from one or more of PA510, PA511, PA512, PA513, PA514, PA515, PA516, PA517, and PA 518. Wherein the relative viscosity of the bio-based long carbon chain polyamide 5X resin is 1.8-2.7, preferably 2.1-2.6; the content of terminal amino groups is 42-60mmol/kg; melting point 170-320 deg.C, preferably 180-230 deg.C; the content of biobased is 28% -100%.
In some specific embodiments, the continuous long fibers may be continuous long fibers conventionally available commercially in the art, and the types may be conventional in the art, such as carbon fibers, glass fibers, basalt fibers, or aramid fibers.
In some embodiments, the continuous long fiber is a continuous long glass fiber, and the monofilament diameter may be 8 to 15 μm, preferably 8 to 10 μm. The linear density of the continuous long glass fiber is 1000-3600Tex, preferably 1200Tex and 2400Tex. Alternatively, the monofilament diameter may be 8 to 25 μm, preferably 15 to 20 μm. The linear density of the continuous long glass fiber can be 500-3600Tex, preferably 1200Tex and 2400Tex. The continuous long glass fibers are, for example, 1200Tex continuous long glass fibers from Owens Costing (OC) and 2400Tex continuous long glass fibers from boulders.
In some specific embodiments, the continuous long fibers are continuous long carbon fibers. The continuous long carbon fiber is preferably a polyacrylonitrile-based carbon fiber. The number of the continuous long carbon fibers can be 20000 to 30000, preferably 12000 (12K) or 24000 (24K); alternatively, the number of filaments of the continuous long carbon fiber may be 5000 to 60000, preferably 12000 (12K), 24000 (24K), 48000 (48K). The continuous long carbon fibers may have a monofilament diameter of 5 to 10 μm, preferably 6 to 8 μm. The continuous long carbon fiber is, for example, dongli T700 with a specification of 24K, or Guangwei composite material continuous long carbon fiber 700S with a specification of 12K or 24K.
In some specific embodiments, the long carbon chain polyamide resin unidirectional prepreg tape is prepared by a melt impregnation method. Among them, the melt impregnation method may be a melt impregnation method that is conventional in the art.
In some specific embodiments, the melt impregnation process comprises the steps of:
s1, stirring and mixing a long-carbon-chain polyamide resin composition containing the long-carbon-chain polyamide 5X resin, extruding by a double-screw extruder (the length and diameter are preferably 1; preferably, the double-screw extruder adopts an eight-zone heating mode, and the temperatures of the first zone to the eight zones (feeding to a machine head) are 195-260 ℃, 255-305 ℃, 255-325 ℃ and 255-325 ℃ in sequence.
S2, introducing the continuous long fiber into the impregnation die head, and impregnating the melt and the continuous long fiber; the temperature of the impregnation die head can be 240-335 ℃; the introduction preferably comprises the following processes: unwinding the continuous long fiber from a creel through a tension controller, passing through a yarn dividing frame, entering a yarn unfolding system to fully unfold each strand, then entering a yarn drying device for preheating, and then entering an impregnation die head to impregnate the continuous long fiber with the melt, wherein the temperature of the yarn drying device is preferably 70-400 ℃;
s3, shaping, cooling, drawing and winding the impregnated continuous long fiber to obtain the long carbon chain polyamide resin unidirectional prepreg tape;
in some specific embodiments, the shaping, cooling may be performed using a four roll machine as is conventional in the art; the four rollers mainly comprise a shaping roller and a cooling roller, wherein the temperature of internal circulating oil in the shaping roller can be 30-250 ℃, for example, 90 ℃, 120 ℃, 150 ℃ and 180 ℃; the temperature of the internally circulating water in the cooling roll may be 15 to 90 c, for example 20 c, 40 c, 60 c or 80 c. Wherein the shaping roller plays the roles of secondary infiltration and cooling forming, and the cooling roller plays the role of cooling forming. The drawing can be carried out using drawing devices conventional in the art, in which further cooling and trimming takes place. The speed of the traction can be 5-15m/min. The winding can be carried out using winding devices conventional in the art, preferably an automatic winder, and the winding speed can be from 5 to 15m/min.
In some specific embodiments, the long carbon chain polyamide resin composition comprises the following components in parts by weight: 90-95 parts of long carbon chain polyamide 5X resin, 0.4-0.6 part of antioxidant, 0.3-0.5 part of lubricant, 4-8 parts of compatilizer and 0.4-0.5 part of coupling agent. Wherein, the antioxidant is preferably selected from one or more of antioxidant 168, antioxidant 1098, antioxidant 1010 and antioxidant S9228. Wherein the lubricant comprises WAXC and WAXE. Wherein the compatilizer can be one or more selected from PP-g-MAH, POE-g-GMA or EPDM-g-MAH. Wherein the coupling agent can be selected from one or more of a coupling agent KH550, a coupling agent KH560 or a coupling agent KH 570.
In a specific embodiment, the long carbon chain polyamide resin composition comprises the following components in parts by weight: long carbon chain bio-based polyamide PA510:94.5 parts, antioxidant 1098:0.3 part, antioxidant 168:0.3 part, internal lubricant WAXE:0.2 part, external lubricant WAXC:0.2 part of compatilizer POE-g-MAH:4 parts, coupling agent KH550:0.5 part.
In a specific embodiment, the long carbon chain polyamide resin composition comprises the following components in parts by weight: long carbon chain bio-based polyamide PA512:94.5 parts, antioxidant 1098:0.3 part, antioxidant 168:0.3 part, internal lubricant WAXE:0.2 part, external lubricant WAXC:0.2 part of compatilizer POE-g-MAH:4 parts, coupling agent KH550:0.5 part.
In some specific embodiments, the long carbon chain polyamide resin unidirectional prepreg tape has a thickness of 0.15 to 0.5mm, preferably 0.21 to 0.33mm, e.g., 0.31mm,0.32mm,0.33mm.
In some specific embodiments, the continuous long fiber-reinforced long carbon chain polyamide resin unidirectional prepreg tape may be a polyamide glass fiber composite prepreg tape, a polyamide aramid fiber composite prepreg tape, a polyamide basalt fiber composite prepreg tape, a polyamide boron fiber composite prepreg tape, or a polyamide carbon fiber composite prepreg tape.
In some specific embodiments, the continuous long fiber-reinforced long carbon chain polyamide resin unidirectional prepreg tape may be a continuous long glass fiber-reinforced long carbon chain polyamide thermoplastic unidirectional prepreg tape or a continuous long carbon fiber-reinforced long carbon chain polyamide thermoplastic unidirectional prepreg tape, such as the continuous long fiber-reinforced long carbon chain polyamide resin unidirectional prepreg tapes disclosed in paragraphs [0008] and [0052] to [0053] of patent CN 113232384A.
Bio-based polyamide film:
in some specific embodiments, the bio-based polyamide film has a thickness of 0.01 to 5mm, for example 0.15mm.
In some embodiments, the bio-based polyamide film is obtained by tape casting a bio-based polyamide resin/melt. The bio-based polyamide is selected from one or more of PA56, PA510, PA511, PA512, PA513, PA514, PA515 and PA 516.
In some specific embodiments, the bio-based polyamide film can be obtained by extruding the bio-based polyamide resin through a screw at 220-300 ℃ to obtain molten polyamide, extruding the molten polyamide through a casting die head to obtain a molten film, cooling and shaping through a casting roller and a cooling roller, rolling and slitting. The chill roll temperature is 20-40 deg.C, for example 30 deg.C. Specifically, the opening of the die lip can be automatically adjusted through online thickness detection and feedback, and films with different thicknesses and thickness deviation controlled within +/-2% are obtained.
In some specific embodiments, the bio-based polyamide resin is PA56 having a relative viscosity of 2.29, a terminal amino group content of 55mmol/kg, a melting point of 253 ℃, a bio-based content of 45%, and a water content of 2000ppm or less.
In some specific embodiments, the bio-based polyamide resin is PA510 with a relative viscosity of 2.51, a terminal amino group content of 54mmol/kg, a melting point of 217 ℃, a bio-based content of 100%, and a water content of 2000ppm or less.
In some specific embodiments, the bio-based polyamide film may be a nylon 56 film, for example, the nylon films disclosed in paragraphs [0008] to [0013] of patent CN 103146190A.
In some specific embodiments, the bio-based polyamide film may be a polyamide 56 resin film, for example, a polyamide 56 resin film disclosed in paragraph [0007] of patent CN 111763313A.
Fiber cloth:
in some specific embodiments, the fiber cloth includes any one or more of a woven cloth, a unidirectional prepreg cloth, a bidirectional prepreg cloth, or a multiaxial cloth made of carbon fiber, glass fiber, basalt fiber, or aramid fiber.
In some specific embodiments, the fiber cloth is a fiberglass cloth, such as a plain weave fiberglass cloth or a twill weave fiberglass cloth, such as commercially available under the designation EWR400 or EWR500T3, from gigantism corps, china.
In some specific embodiments, the fiber cloth has a thickness of 0.1 to 0.4mm, preferably 0.175 to 0.193mm. For example, plain woven glass cloth with a thickness of 0.175mm and twill woven glass cloth with a thickness of 0.185mm.
In the invention, the layering mode among the first surface layer, the middle layer and the second surface layer can be parallel layering or cross layering. The parallel layering means that the layering directions of all layers are the same; the cross-ply refers to the ply of layers which are laid at a certain angle. The angle of the cross-ply may be 0 ° to 90 ° cross, for example 45 ° cross, 90 ° cross.
In some specific embodiments, the bio-based polyamide films and the fiber cloth of the intermediate layer are alternately layered.
In some specific embodiments, the number of the first skin layer and the second skin layer is 1 or more, and may be 2, 3, 4 or more. For example, the first skin layer and the second skin layer are each laid up with 1 layer of long carbon chain polyamide resin unidirectional prepreg tape, or 2 layers of long carbon chain polyamide resin unidirectional prepreg tapes are respectively cross-laid.
In some specific embodiments, the number of intermediate layers is 2 or more, and may be, for example, 3, 4 or more. For example, when the middle layer is 3 layers, the alternate layering of the bio-based polyamide film and the fiber cloth is that: the bio-based polyamide film-fiber cloth-bio-based polyamide film. For example, when the middle layer is 4 layers, the alternate layering of the bio-based polyamide film and the fiber cloth is that: the biological polyamide film-fiber cloth-biological polyamide film-fiber cloth.
In some specific embodiments, the total number of layers of the first skin layer, the intermediate layer, and the second skin layer is 5 to 200, for example 13, 25, 11. For example, when the total number of layers is 5, the bio-based polyamide composite board comprises the following components in sequence from the first surface layer: the long carbon chain polyamide resin unidirectional prepreg tape-bio-based polyamide film-fiber cloth-bio-based polyamide film-long carbon chain polyamide resin unidirectional prepreg tape.
In some embodiments, the composite board may be molded with different total number of layers depending on the thickness of the composite board.
In some specific embodiments, the thickness of the bio-based polyamide composite panel is 0.5mm or more.
In some specific embodiments, the thickness of the bio-based polyamide composite panel is 1-40mm, such as 2mm, 4mm, 10mm.
The second technical proposal is that: a bio-based polyamide composite board A comprises a bio-based polyamide film and fiber cloth, wherein the bio-based polyamide film and the fiber cloth are alternately layered.
Wherein the bio-based polyamide film may be as described above.
Wherein the fiber cloth can be as described above.
The number of the layers of the bio-based polyamide composite board a can be more than 2, for example, 3, 4 or more layers. For example, when the bio-based polyamide composite board a has 3 layers, the alternate layering of the bio-based polyamide films and the fiber cloth is as follows: the biological polyamide film-fiber cloth-biological polyamide film. For example, when the bio-based polyamide composite board a has 4 layers, the alternate layering of the bio-based polyamide films and the fiber cloth is as follows: the biological polyamide film-fiber cloth-biological polyamide film-fiber cloth.
The third technical proposal: a preparation method of the bio-based polyamide composite board comprises the steps of sequentially layering a first surface layer, a middle layer and a second surface layer, and then carrying out compression molding, wherein the compression molding temperature is 170-310 ℃, and the pressure is 0-5Mpa.
In the preparation process of the composite board, the bio-based polyamide film is melted at high temperature, impregnated with fiber cloth and/or long carbon chain polyamide resin prepreg tapes, and then cooled and shaped to obtain the composite board.
In the present invention, the apparatus used for the press molding may be an apparatus conventionally used for press molding in the art, such as a press, which may be a double steel strip press compound machine.
In some specific embodiments, the temperature at which the compression molding is performed is preferably 5 to 10 ℃ higher than the melting point of the bio-based polyamide resin, preferably 225 to 265 ℃, for example 265 ℃.
In some embodiments, the pressure is 1 to 5MPa, such as 2MPa.
In some embodiments, the compression molding may be a compression molding conventional in the art, such as continuous compression molding or direct compression molding.
In some specific embodiments, when the compression molding is continuous compression molding, the continuous auto-layering step can be performed according to the conventional art, and comprises preheating for 1-7min, holding for 1-30min, preferably preheating for 5-7min, and holding for 8-10min. When the compression molding is direct compression molding, the direct compression molding may include steps of preheating, exhausting, holding pressure, and cooling as is conventional in the art.
In the present invention, before the laying-up, it is preferable to further include a step of drying the material of each layer. Reducing the water content of the material by drying prevents excessive air bubbles from being generated during the molding process.
Wherein the drying operation may be a drying operation conventional in the art, such as vacuum drying. The temperature of the drying is preferably 85 to 120 c, for example 105 c. The drying time is preferably 4 to 25 hours, further 15 to 24 hours, for example 15h,20h,24h.
The fourth technical proposal is that: a molded article comprising the bio-based polyamide composite panel.
The fifth technical proposal is that: the application of the bio-based polyamide composite board in the aerospace field, the military field, the automobile material, the sports equipment, the building material or the electronic and electric appliance is provided.
On the basis of the common knowledge in the field, the above preferred conditions can be combined randomly to obtain the preferred embodiments of the invention. The reagents and starting materials used in the present invention are commercially available.
The positive progress effects of the invention are as follows:
1. the bio-based polyamide composite board adopts bio-based polyamide as a raw material: the monomer pentanediamine in the raw material is prepared by biological fermentation, the bio-based content is high, the concept of sustainable development of material sources is met, the bio-based content is high, and the use of fossil raw materials is effectively reduced, so that the carbon emission is reduced.
2. The bio-based polyamide composite board of the invention comprises the following components:
(1) The glass fiber content is high and can be higher than 60%;
(2) The composite plate has excellent mechanical properties, and specifically, the bending strength of the 2mm composite plate is more than 295MPa, and the bending modulus is more than 13 GPa; the bending strength of the 4mm composite plate is more than 376MPa, and the bending modulus is more than 13 GPa; the water absorption is low and is lower than 0.64 percent; the heat resistance is excellent;
(3) The fibers are uniformly distributed, no fiber is exposed, and the processing is easy;
(4) The thickness of the plate can be set between 1mm and 40mm according to requirements, and more design freedom can be provided for products.
3. The preparation method of the bio-based polyamide composite board is simple and feasible.
Drawings
Fig. 1 is a schematic structural diagram of a composite board according to embodiment 1 of the present invention, wherein: 1: PA510 unidirectional prepreg tape; 2: a PA56 film; 3: plain weave fiberglass cloth; 4: PA510 unidirectional prepreg tape.
Detailed Description
The invention is further illustrated by the following examples, which are not intended to limit the invention thereto. The experimental methods without specifying specific conditions in the following examples were selected according to the conventional methods and conditions, or according to the commercial instructions.
In the following examples and comparative examples: the purchase sources of the raw materials are as follows: bio-based polyamide resins PA56, PA510, PA512 available from kaiser (jinxiang) biomaterials ltd; antioxidants were purchased from basf group, germany; WAXE and WAXC were purchased from Clariant, germany; compatibilizers were purchased from Shanghai good easy polymer, inc.; coupling agents were purchased from Hangzhou Jessica chemical Co., ltd; continuous long glass fibers were purchased from Owens Corning (OC) with a 1200Tex specification; plain weave fiberglass cloth (designation EWR 400), twill weave fiberglass cloth (designation EWR500T 3), available from china gigantism corps. The molding press used for compression molding is a double-steel-belt molding compound machine.
Wherein the characteristics of each polyamide resin are as follows:
the viscosity of PA56 is 2.29, the content of terminal amino groups is 55mmol/kg, and the melting point is 253 ℃;
the viscosity of PA510 is 2.51, the content of terminal amino groups is 54mmol/kg, and the melting point is 217 ℃;
the viscosity of PA512 is 2.32, the content of terminal amino groups is 56mmol/kg, and the melting point is 210 ℃;
PA6 had a viscosity of 2.3, a terminal amino group content of 54mmol/kg and a melting point of 223 ℃.
Preparative example 1a 510 unidirectional prepreg tape is shown in preparative example 3 of the specification of patent CN 113232384A.
Preparation example 2 preparation of PA512 unidirectional prepreg tape is shown in preparation example 3 of the specification of patent CN 113232384A.
Preparation example 3 preparation of film of Bio-based Polyamide 56
And extruding the PA56 resin by a double screw to obtain molten PA56, controlling the temperature of the screw to be 265 ℃, extruding the molten PA56 by a casting die head to obtain a molten film, cooling and shaping the molten film by a casting roller and a cooling roller, controlling the temperature of the cooling roller to be 30 ℃, regulating the opening of a die lip to be 0.15mm by a film thickness gauge to control the thickness deviation to be within +/-2%, and eliminating and cutting static electricity to obtain the PA56 film with the thickness of 0.15mm.
Preparation example 4 preparation of bio-based polyamide 510 film
The preparation method is the same as that of preparation example 3, except that: the film material was PA510 resin, and a PA510 film was finally obtained with a thickness of 0.15mm.
Comparative preparation example 1 preparation of Polyamide 6 film
And extruding the PA6 resin by a double screw to obtain molten PA6, wherein the temperature of the screw is 230 ℃, extruding the molten PA6 by a casting die head to obtain a molten film, cooling and shaping the molten film by a casting roller and a cooling roller, controlling the temperature of the cooling roller to be 30 ℃, adjusting the opening of a die lip to be 0.15mm by a film thickness gauge to control the thickness deviation to be within +/-2%, and eliminating and cutting static to obtain the PA6 film with the thickness of 0.15mm.
Comparative preparation example 2 preparation of polyamide 6 unidirectional prepreg tape
The preparation method is the same as that of preparation example 1, except that: in the step (1), the double-screw extruder adopts an eight-zone heating mode, and the temperatures of the first zone to the eight zones (feeding to a machine head) are 200 ℃, 220 ℃, 245 ℃ and 245 ℃ in sequence; the rotating speed of the screw is 400r/min; the length-diameter ratio of the twin-screw extruder is 1; the temperature of the melt filter is 250 ℃; the die temperature is 250 ℃, and finally the PA6 unidirectional prepreg tape is obtained.
Example 1 Bio-based polyamide composite sheet
First skin layer A1: PA510 unidirectional prepreg tape (prepared as in preparation example 1), 0.31mm thick, 62.8wt% fiber content;
intermediate layer B: PA56 film (preparation method as in preparation example 3), thickness 0.15mm; plain woven glass fabric with the thickness of 0.175mm;
second skin layer A2: PA510 unidirectional prepreg tape (prepared as in preparation example 1), 0.31mm thick, 62.8wt% fibre content;
cutting the prepreg tape and the glass fiber cloth into the size of a mold, placing one layer of demolding cloth or demolding paper on the upper layer and the lower layer of the template, placing a first surface layer, a middle layer and a second surface layer with different layers in the middle, and carrying out continuous compression molding on a double-steel-tape compression molding compound machine, specifically:
(1) 1 layer of PA510 unidirectional prepreg tape is laid on the first surface layer;
(2) Laying 11 layers in the middle layer, wherein the upper surface layer and the lower surface layer of the middle layer are PA56 film laying layers, the middle layer is PA56 films and plain glass fiber cloth alternately laying layers up and down, 6 layers of PA56 films are laid, and 5 layers of plain glass fiber cloth are laid, namely, the PA56 films-glass fiber cloth-PA 56 films;
(3) Laying 1 layer of PA510 unidirectional prepreg tape on the second surface layer;
and sequentially layering the first surface layer, the middle layer and the second surface layer, and then carrying out compression molding, wherein the temperature of a molding press is set to be 265 ℃, the pressure is controlled to be 2MPa, and the bio-based polyamide composite board 1A1- [11B ] -1A2 with the thickness of 2mm and the number of layers of 13 is prepared. The structure of the device is schematically shown in figure 1.
Example 2 Bio-based polyamide composite sheet
First skin layer A1: PA512 unidirectional prepreg tape (prepared as in preparation example 2), 0.31mm thick, 62.8wt% fiber content;
an intermediate layer B: PA56 film (preparation method as in preparation example 3), thickness 0.15mm; plain woven glass cloth with the thickness of 0.175mm;
second skin layer A2: PA512 unidirectional prepreg tape (prepared as in preparation example 2), 0.31mm thick, 62.8wt% fiber content;
cutting the prepreg tape and the glass fiber cloth into the size of a mold, placing one layer of demolding cloth or demolding paper on the upper layer and the lower layer of the template, placing a first surface layer, a middle layer and a second surface layer with different layers in the middle, and carrying out continuous compression molding on a double-steel-tape compression molding compound machine, specifically:
(1) 1 layer of PA512 unidirectional prepreg tape is laid on the first surface layer;
(2) The middle layer is paved with 11 layers, the upper surface layer and the lower surface layer are paved with PA56 films, the middle layer is paved with PA56 films and plain fiberglass cloth which are alternatively paved up and down, and 6 layers of PA56 films are paved, 5 layers of plain fiberglass cloth are paved, namely PA56 film-fiberglass cloth-PA 56 film;
(3) Laying 1 layer of PA512 unidirectional prepreg tape on the second surface layer;
and sequentially layering the first surface layer, the middle layer and the second surface layer, and then carrying out compression molding, wherein the temperature of a molding press is set to be 265 ℃, the pressure is controlled to be 2MPa, and the bio-based polyamide composite board 1A1- [11B ] -1A2 with the thickness of 2mm and the number of layers of 13 is prepared.
Example 3 Bio-based polyamide composite sheet
The raw materials of the first skin layer and the second skin layer were the same as in example 1, except that the intermediate layer B: PA510 film (prepared as in preparation example 4) having a thickness of 0.15mm; plain woven glass cloth with a thickness of 0.175mm.
Cutting prepreg tape, glass fiber cloth into the mould size, placing 1 layer of drawing of patterns cloth or drawing of patterns paper in the upper strata and the lower floor of template, place the first top layer, intermediate level and the second top layer of the different numbers of piles in the centre, carry out continuous compression molding on two steel band mould pressing compounding machines, specifically:
(1) 1 layer of PA510 unidirectional prepreg tape is laid on the first surface layer;
(2) 11 layers of middle layers are paved, the upper surface layer and the lower surface layer of the middle layers are paved with PA510 films, the middle layers are paved with PA510 films and plain fiberglass cloth in an up-down alternative mode, 6 layers of PA510 films are paved, and 5 layers of plain fiberglass cloth are paved, namely the PA510 films-fiberglass cloth-PA 510 films;
(3) Laying 1 layer of PA510 unidirectional prepreg tape on the second surface layer;
sequentially layering the first surface layer, the middle layer and the second surface layer, and performing compression molding, wherein the temperature of a molding press is set to 225 ℃, the pressure is controlled to be 2MPa, and the bio-based polyamide composite board 1A1- [11B ] -1A2 with the thickness of 2mm and 13 layers is prepared
Example 4 Bio-based polyamide composite sheet
The raw materials of the first skin layer and the second skin layer were the same as in example 2, except that the intermediate layer B: PA510 film (prepared as in preparation example 4) having a thickness of 0.15mm; plain woven glass cloth with a thickness of 0.175mm.
Cutting the prepreg tape and the glass fiber cloth into the size of a mold, placing 1 layer of demolding cloth or demolding paper on the upper layer and the lower layer of the template, placing a first surface layer, a middle layer and a second surface layer with different layers in the middle, and carrying out continuous compression molding on a double-steel-tape compression molding compound machine, specifically:
(1) 1 layer of PA512 unidirectional prepreg tape is laid on the first surface layer;
(2) 11 layers of middle layers are paved, the upper surface layer and the lower surface layer of the middle layers are paved with PA510 films, the middle layers are paved with PA510 films and plain fiberglass cloth in an up-down alternative mode, 6 layers of PA510 films are paved, and 5 layers of plain fiberglass cloth are paved, namely the PA510 films-fiberglass cloth-PA 510 films;
(3) Laying 1 layer of PA512 unidirectional prepreg tape on the second surface layer;
the first surface layer, the middle layer and the second surface layer are sequentially layered and then compression molding is carried out, the temperature of a molding press is set to 225 ℃, the pressure is controlled to be 2MPa, and the bio-based polyamide composite board 1A1- [11B ] -1A2 with the thickness of 2mm and the number of layers of 13 is prepared
Example 5 Bio-based Polyamide composite sheet Material
The raw materials of the first surface layer, the second surface layer and the middle layer are the same as those of the embodiment 1, and the difference is that the paving modes are different: cutting the prepreg tape and the glass fiber cloth into the size of a mold, placing 1 layer of demolding cloth or demolding paper on the upper layer and the lower layer of the template, placing a first surface layer, a middle layer and a second surface layer with different layers in the middle, and carrying out continuous compression molding on a double-steel-tape compression molding compound machine, specifically:
(1) 1 layer of PA510 unidirectional prepreg tape is laid on the first surface layer;
(2) Laying 23 layers in the middle layer, wherein the upper and lower surface layers are PA56 film layers, the middle layer is PA56 film and plain fiberglass cloth layers which are alternately laid up and down, 12 layers of PA56 films are laid totally, 11 layers of plain fiberglass cloth are laid totally, namely PA56 film-glass fiber cloth-PA 56 film-glass fiber cloth-PA 56 film;
(3) Laying 1 layer of PA510 unidirectional prepreg tape on the second surface layer;
and sequentially layering the first surface layer, the middle layer and the second surface layer, and then carrying out compression molding, wherein the temperature of a molding press is set to be 265 ℃, the pressure is controlled to be 2MPa, and the bio-based polyamide composite board 1A1- [23B ] -1A2 with the thickness of 4mm and the number of 25 layers is prepared.
Example 6 Bio-based polyamide composite Panel
The raw materials of the first surface layer, the second surface layer and the middle layer are the same as those of the example 2, and the differences are that the paving modes are different: cutting prepreg tape, glass fiber cloth into the mould size, placing 1 layer of drawing of patterns cloth or drawing of patterns paper in the upper strata and the lower floor of template, place the first top layer, intermediate level and the second top layer of the different numbers of piles in the centre, carry out continuous compression molding on two steel band mould pressing compounding machines, specifically:
(1) 1 layer of PA512 unidirectional prepreg tape is laid on the first surface layer;
(2) <xnotran> 23 , PA56 , PA56 , PA56 12 , 11 , PA56 - -PA56 - -PA56 - -PA56 - -PA56 - -PA56 - -PA56 - -PA56 - -PA56 - -PA56 - -PA56 - -PA56 ; </xnotran>
(3) Laying 1 layer of PA512 unidirectional prepreg tape on the second surface layer;
and sequentially layering the first surface layer, the middle layer and the second surface layer, and then carrying out compression molding, wherein the temperature of a molding press is set to be 265 ℃, the pressure is controlled to be 2MPa, and the bio-based polyamide composite board 1A1- [23B ] -1A2 with the thickness of 4mm and the number of layers of 25 is prepared.
Example 7 Bio-based Polyamide composite sheet Material
The raw materials of the first surface layer, the second surface layer and the middle layer are the same as those of the embodiment 3, and the difference is that the layering modes are different: cutting prepreg tape, glass fiber cloth into the mould size, placing 1 layer of drawing of patterns cloth or drawing of patterns paper in the upper strata and the lower floor of template, place the first top layer, intermediate level and the second top layer of the different numbers of piles in the centre, carry out continuous compression molding on two steel band mould pressing compounding machines, specifically:
(1) 1 layer of PA510 unidirectional prepreg tape is laid on the first surface layer;
(2) Laying 23 layers in the middle layer, wherein the upper and lower surface layers are PA510 film laying layers, the middle layer is PA510 film and plain fiberglass cloth alternately laying layers up and down, the PA510 film is totally laid by 12 layers, the plain fiberglass cloth is totally laid by 11 layers, namely PA510 film-glass fiber cloth-PA 510 film-glass fiber cloth-PA 510 film;
(3) Laying 1 layer of PA510 unidirectional prepreg tape on the second surface layer;
and sequentially layering the first surface layer, the middle layer and the second surface layer, and then carrying out compression molding, wherein the temperature of a molding press is set to 225 ℃, the pressure is controlled to be 2MPa, and the bio-based polyamide composite board 1A1- [23B ] -1A2 with the thickness of 4mm and the number of 25 layers is prepared.
EXAMPLE 8 Bio-based Polyamide composite sheet
The raw materials of the first surface layer, the second surface layer and the middle layer are the same as those of the example 4, and the difference is that the paving modes are different: cutting the prepreg tape and the glass fiber cloth into the size of a mold, placing 1 layer of demolding cloth or demolding paper on the upper layer and the lower layer of the template, placing a first surface layer, a middle layer and a second surface layer with different layers in the middle, and carrying out continuous compression molding on a double-steel-tape compression molding compound machine, specifically:
(1) 1 layer of PA512 unidirectional prepreg tape is laid on the first surface layer;
(2) Laying 23 layers in the middle layer, wherein the upper and lower surface layers are PA510 film laying layers, the middle layer is PA510 film and plain fiberglass cloth alternately laying layers up and down, the PA510 film is totally laid by 12 layers, the plain fiberglass cloth is totally laid by 11 layers, namely PA510 film-glass fiber cloth-PA 510 film-glass fiber cloth-PA 510 film;
(3) Laying 1 layer of PA512 unidirectional prepreg tape on the second surface layer;
and sequentially layering the first surface layer, the middle layer and the second surface layer, and then carrying out compression molding, wherein the temperature of a molding press is set to 225 ℃, the pressure is controlled to be 2MPa, and the bio-based polyamide composite board 1A1- [23B ] -1A2 with the thickness of 4mm and the number of layers of 25 is prepared.
Example 9 Bio-based Polyamide composite sheet Material
The raw materials of the first surface layer, the second surface layer and the middle layer are the same as those of the embodiment 1, and the difference is that the paving modes are different: cutting prepreg tape, glass fiber cloth into the mould size, placing 1 layer of drawing of patterns cloth or drawing of patterns paper in the upper strata and the lower floor of template, place the first top layer, intermediate level and the second top layer of the different numbers of piles in the centre, carry out continuous compression molding on two steel band mould pressing compounding machines, specifically:
(1) 2 layers of PA510 unidirectional prepreg tapes are laid on the first surface layer, and are crossly laid at an angle of 90 degrees according to the direction of the long glass fibers;
(2) Laying 7 layers in the middle layer, wherein the upper surface layer and the lower surface layer are PA56 film laying layers, the middle layer is PA56 films and plain fiberglass cloth alternately laying layers up and down, 4 layers of PA56 films are laid totally, and 3 layers of plain fiberglass cloth are laid totally, namely, the PA56 films-the fiberglass cloth-the PA56 films
(3) 2 layers of PA510 unidirectional prepreg tapes are laid on the second surface layer, and are crossly laid at 90 degrees according to the direction of the long glass fibers;
and sequentially layering the first surface layer, the middle layer and the second surface layer, and then carrying out compression molding, wherein the temperature of a molding press is set to be 265 ℃, the pressure is controlled to be 2MPa, and the bio-based polyamide composite board 2A1- [7B ] -2A2 with the thickness of 2mm and the number of layers of 11 is prepared.
Example 10 Bio-based polyamide composite sheet
The raw materials of the first surface layer, the second surface layer and the middle layer are the same as those of the embodiment 3, and the difference is that the layering modes are different: cutting the prepreg tape and the glass fiber cloth into the size of a mold, placing 1 layer of demolding cloth or demolding paper on the upper layer and the lower layer of the template, placing a first surface layer, a middle layer and a second surface layer with different layers in the middle, and carrying out continuous compression molding on a double-steel-tape compression molding compound machine, specifically:
(1) 2 layers of PA510 unidirectional prepreg tapes are laid on the first surface layer, and are crossly laid at an angle of 90 degrees according to the direction of the long glass fibers;
(2) 7 layers of PA510 film layers are laid on the middle layer, the upper surface layer and the lower surface layer of the middle layer are PA510 film layers, the middle layer is PA510 films and plain fiberglass cloth layers which are alternately laid up and down, 4 layers of PA510 films are laid, and 3 layers of plain fiberglass cloth are laid, namely PA510 film-fiberglass cloth-PA 510 film
(3) 2 layers of PA510 unidirectional prepreg tapes are laid on the second surface layer, and are crossly laid at 90 degrees according to the direction of the long glass fibers;
and sequentially layering the first surface layer, the middle layer and the second surface layer, and then carrying out compression molding, wherein the temperature of a molding press is set to 225 ℃, the pressure is controlled to be 2MPa, and the bio-based polyamide composite board 2A1- [7B ] -2A2 with the thickness of 2mm and the number of layers of 11 layers is prepared.
Comparative example 1 Polyamide 6 composite sheet
First skin layer A1: PA510 unidirectional prepreg tape (prepared as in preparation example 1), 0.31mm thick, 62.8wt% fiber content;
an intermediate layer B: PA6 film (prepared as in comparative preparation example 1) having a thickness of 0.15mm; plain woven glass cloth with the thickness of 0.175mm;
second skin layer A2: PA510 unidirectional prepreg tape (prepared as in preparation example 1), 0.31mm thick, 62.8wt% fibre content;
cutting the prepreg tape and the glass fiber cloth into the size of a mold, placing 1 layer of demolding cloth or demolding paper on the upper layer and the lower layer of the template, placing a first surface layer, a middle layer and a second surface layer with different layers in the middle, and carrying out continuous compression molding on a double-steel-tape compression molding compound machine, specifically:
(1) 1 layer of PA510 unidirectional prepreg tape is laid on the first surface layer;
(2) The middle layer is paved with 11 layers, the upper surface layer and the lower surface layer are paved with PA6 films, the middle layer is paved with PA6 films and plain fiberglass cloth which are alternatively paved up and down, and the PA6 films are paved with 6 layers totally, and the plain fiberglass cloth is paved with 5 layers totally, namely the PA6 film-fiberglass cloth-PA 6 film;
(3) The second surface layer is paved with 1 layer of PA510 unidirectional prepreg tape;
and sequentially layering the first surface layer, the middle layer and the second surface layer, and then carrying out compression molding, wherein the temperature of a molding press is set to 235 ℃, the pressure is controlled to be 2MPa, and the PA6 composite board 1A1- [11B ] -1A2 with the thickness of 2mm and 13 layers is prepared.
Comparative example 2 Polyamide 6 composite sheet
The raw materials of the first surface layer, the second surface layer and the middle layer are the same as those of the comparative example 1, and the difference is that the paving modes are different: cutting prepreg tape, glass fiber cloth into the mould size, placing 1 layer of drawing of patterns cloth or drawing of patterns paper in the upper strata and the lower floor of template, place the first top layer, intermediate level and the second top layer of the different numbers of piles in the centre, carry out continuous compression molding on two steel band mould pressing compounding machines, specifically:
(1) 1 layer of PA510 unidirectional prepreg tape is laid on the first surface layer;
(2) Laying 23 layers in the middle layer, wherein the upper and lower surface layers are PA6 film layers, the middle layer is PA6 film and plain fiberglass cloth layers which are alternately laid up and down, 12 layers of PA6 films and 11 layers of plain fiberglass cloth are laid together, namely PA6 film-glass fiber cloth-PA 6 film-glass fiber cloth-PA 6 film;
(3) The second surface layer is used for laying 1 layer of PA510 unidirectional prepreg tape;
and sequentially layering the first surface layer, the middle layer and the second surface layer, and then carrying out compression molding, wherein the temperature of a molding press is set to be 235 ℃, the pressure is controlled to be 2MPa, and the PA6 composite board 1A1- [23B ] -1A2 with the thickness of 4mm and the number of layers of 25 is prepared.
Comparative example 3 Polyamide 6 composite sheet
The raw materials of the first surface layer, the second surface layer and the middle layer are the same as those of the comparative example 1, and the difference is that the paving modes are different: cutting the prepreg tape and the glass fiber cloth into the size of a mold, placing 1 layer of demolding cloth or demolding paper on the upper layer and the lower layer of the template, placing a first surface layer, a middle layer and a second surface layer with different layers in the middle, and carrying out continuous compression molding on a double-steel-tape compression molding compound machine, specifically:
(1) 2 layers of PA510 unidirectional prepreg tapes are laid on the first surface layer, and are crossly laid at an angle of 90 degrees according to the direction of the long glass fibers;
(2) The middle layer is paved with 7 layers, the upper surface layer and the lower surface layer are paved with PA6 films, the middle layer is paved with PA6 films and plain fiberglass cloth which are alternatively paved up and down, and the PA6 films are paved with 4 layers totally, and the plain fiberglass cloth is paved with 3 layers totally, namely, the PA6 film-fiberglass cloth-PA 6 film
(3) 2 layers of PA510 unidirectional prepreg tapes are laid on the second surface layer, and are crossly laid at 90 degrees according to the direction of the long glass fibers;
and sequentially layering the first surface layer, the middle layer and the second surface layer, and then carrying out compression molding, wherein the temperature of a molding press is set to be 235 ℃, the pressure is controlled to be 2MPa, and the PA6 composite board 2A1- [7B ] -2A2 with the thickness of 2mm and 11 layers is prepared.
Comparative example 4 polyamide 6 composite board
First skin layer A1: PA6 unidirectional prepreg tape (prepared as comparative preparation example 2) with a thickness of 0.32mm and a fiber content of 61.4wt%;
an intermediate layer B: PA6 film (prepared as in comparative preparation example 1) having a thickness of 0.15mm; plain woven glass fiber cloth with a thickness of 0.175mm
Second skin layer A2: PA6 unidirectional prepreg tape (prepared as comparative preparation example 2) with a thickness of 0.32mm and a fiber content of 61.4wt%;
cutting prepreg tape, glass fiber cloth into the mould size, placing 1 layer of drawing of patterns cloth or drawing of patterns paper in the upper strata and the lower floor of template, place the first top layer, intermediate level and the second top layer of the different numbers of piles in the centre, carry out continuous compression molding on two steel band mould pressing compounding machines, specifically:
(1) 2 layers of PA6 unidirectional prepreg tapes are laid on the first surface layer, and are crossly laid at 90 degrees according to the direction of the long glass fiber;
(2) Laying 7 layers in the middle layer, wherein the upper and lower surface layers are PA6 film laying layers, the middle layer is PA6 film and plain weave fiberglass cloth alternately laying layers up and down, 4 layers of PA6 film are laid totally, 3 layers of plain weave fiberglass cloth are laid totally, namely PA6 film-fiberglass cloth-PA 6 film-fiberglass cloth-PA 6 film
(3) Laying 2 layers of PA6 unidirectional prepreg tapes on the second surface layer, and crossly laying the layers at 90 degrees according to the direction of the long glass fiber;
and sequentially layering the first surface layer, the middle layer and the second surface layer, and then carrying out compression molding, wherein the temperature of a molding press is set to be 235 ℃, the pressure is controlled to be 2MPa, and the PA6 composite board 2A1- [7B ] -2A2 with the thickness of 2mm and 11 layers is prepared.
The composite boards obtained by the above examples and comparative examples were tested with reference to the following criteria, and the test results are shown in table 1:
1. flexural strength and flexural modulus: specimens with sample dimensions of 127mm long, 12.7mm wide and 2mm thick were cut according to ASTM D790-2017 standard for bending experiments.
2. Heat Distortion Temperature (HDT) test: according to the national standard GB/T1634.2-2004, a sample strip with the sample size of 120mm long, 10mm wide and 4mm thick is prepared, and the applied bending stress is 1.8Mpa.
3. Water absorption test: a sample of 60mm length, 60mm width and 2mm thickness is first prepared according to the standard ASTM-D570-2005 and the test time is 24h according to the plastics method.
4. Testing the fiber content of the composite board: calcining at 700 deg.C for 2 hours according to GB/T9345.1-2008.
TABLE 1
As can be seen from Table 1: by comparing the examples with the comparative examples, it can be found that: the mechanical property strength and modulus of the continuous long glass fiber reinforced bio-based polyamide composite board are obviously improved compared with the corresponding properties of the continuous long glass fiber reinforced PA6 composite board, the heat resistance is also obviously superior to that of the continuous long glass fiber reinforced PA6 composite board, and the water absorption rate is lower than that of the continuous long glass fiber reinforced PA6 composite board.
Unless otherwise defined, all terms used herein have the meanings commonly understood by those skilled in the art.
The described embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of the present invention, and those skilled in the art may make various other substitutions, alterations, and modifications within the scope of the present invention, and thus, the present invention is not limited to the above-described embodiments but only by the claims.
Claims (10)
1. The bio-based polyamide composite board is characterized by comprising a first surface layer, a middle layer and a second surface layer; the first surface layer, the middle layer and the second surface layer are sequentially overlapped; the first surface layer and the second surface layer are long carbon chain polyamide resin unidirectional prepreg tapes, and the middle layer comprises a bio-based polyamide film and fiber cloth.
2. The bio-based polyamide composite board according to claim 1, wherein the long carbon chain polyamide resin unidirectional prepreg tape is a continuous long fiber reinforced long carbon chain polyamide resin unidirectional prepreg tape comprising a continuous long fiber and a bio-based long carbon chain polyamide 5X resin;
preferably, the mass percent of the continuous long fibers is 40-80%, more preferably 60-70%, for example 62.8%;
preferably, the bio-based long carbon chain polyamide 5X resin is selected from one or more of PA510, PA511, PA512, PA513, PA514, PA515, PA516, PA517 and PA 518;
preferably, the relative viscosity of the bio-based long carbon chain polyamide 5X resin is 1.8-2.7, preferably 2.1-2.6; the content of terminal amino groups is 42-60mmol/kg; melting point 170-320 deg.C, preferably 180-230 deg.C; the content of the bio-based is 28-100%;
preferably, the continuous long fibers comprise carbon fibers, glass fibers, basalt fibers or aramid fibers;
preferably, the continuous long fiber is a continuous long glass fiber or a continuous long carbon fiber.
3. The bio-based polyamide composite panel according to claim 1, wherein the long carbon chain polyamide resin unidirectional prepreg tape has a thickness of 0.15-0.5mm, preferably 0.21-0.33mm, such as 0.31mm,0.32mm or 0.33mm.
4. The bio-based polyamide composite panel according to claim 1, characterized in that the thickness of the bio-based polyamide film is 0.01-5mm, such as 0.15mm;
preferably, the bio-based polyamide film is obtained by tape casting the bio-based polyamide resin/melt;
preferably, the bio-based polyamide is selected from one or more of PA56, PA510, PA511, PA512, PA513, PA514, PA515 and PA 516;
preferably, the bio-based polyamide film can be obtained by extruding the bio-based polyamide resin through a screw rod at 220-300 ℃ to obtain molten polyamide, extruding the molten polyamide through a casting die head to obtain a molten film, and then cooling, shaping, rolling and slitting the molten polyamide through a casting roller and a cooling roller, wherein the temperature of the cooling roller is more preferably 20-40 ℃, such as 30 ℃.
5. The bio-based polyamide composite board according to claim 1, wherein the fiber cloth comprises any one or more of woven cloth, unidirectional prepreg cloth, bidirectional prepreg cloth or multi-axial cloth made of carbon fiber, glass fiber, basalt fiber or aramid fiber;
preferably, the thickness of the fiber cloth is 0.1-0.4mm, more preferably 0.175-0.193mm, such as 0.185mm.
6. The bio-based polyamide composite panel according to claim 1, wherein the ply pattern between the first surface layer, the middle layer and the second surface layer is a parallel ply or a cross ply;
preferably, the bio-based polyamide films and the fiber cloth of the middle layer are alternately layered;
preferably, the number of the first surface layer and the second surface layer is more than 1, such as 2, 3 or 4;
preferably, the number of the intermediate layers is more than 2, such as 3 or 4;
preferably, the total number of layers of the first skin layer, the intermediate layer and the second skin layer is 5-200, for example 11, 13 or 25;
and/or the thickness of the bio-based polyamide composite board is more than 0.5 mm;
preferably, the thickness of the bio-based polyamide composite board is 1-40mm, such as 2mm, 4mm, 10mm.
7. A method for preparing the bio-based polyamide composite board according to any one of claims 1 to 6, wherein the first surface layer, the middle layer and the second surface layer are sequentially laminated and then subjected to compression molding, wherein the compression molding temperature is 170-310 ℃, and the compression molding pressure is 0-5MPa, such as 2MPa;
preferably, the temperature for compression molding is 5-10 ℃ higher than the melting point of the bio-based polyamide resin, more preferably 225-265 ℃, such as 265 ℃;
preferably, the compression molding mode is continuous compression molding or direct compression molding, and more preferably, when the compression molding mode is continuous compression molding, the steps comprise preheating for 5-7min and maintaining the pressure for 8-10min; when the compression molding mode is direct compression molding, the steps comprise preheating, exhausting, pressure maintaining and cooling;
and/or, before the laying up, drying the material of each layer; the temperature of the drying is preferably 85-120 ℃, e.g. 105 ℃; the drying time is preferably 4 to 25 hours, more preferably 15 to 24 hours, for example, 15h,20h,24h.
8. A bio-based polyamide composite panel A, characterized in that it comprises the bio-based polyamide film according to any one of claims 1, 4-5 and the fiber cloth according to any one of claims 1, 4-5, the bio-based polyamide film and the fiber cloth being alternately layered.
9. A molded article comprising the bio-based polyamide composite panel according to any one of claims 1 to 7.
10. Use of the bio-based polyamide composite panel according to any one of claims 1 to 7 in the aerospace field, military field, automotive material, sports equipment, building material or electronic and electrical equipment.
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