ABA in-mold composite board and processing method thereof

Abstract

The invention discloses an ABA in-mold composite board and a processing method thereof, and belongs to the technical field of composite board processing. The ABA in-mold composite board comprises surface layers and a middle layer, the two sides of the middle layer are tightly wrapped by the surface layers, the surface layers are prepared from 950-1000 parts of general-purpose polystyrene resin and 0-50 parts of light diffusion master batches, and the middle layer is prepared from 890-980 parts of general-purpose polystyrene resin, 1-60 parts of foaming master batches and 5-100 parts of light diffusion master batches. The ABA in-mold composite board prepared by the method has excellent light diffusion performance, durability, strength and heat insulation and sound absorption performance.

Description

Technical Field

[0001] The invention belongs to the technical field of ABA in-mold composite sheet preparation, and in particular relates to an ABA in-mold composite sheet and a processing method thereof. Background Art

[0002] Smart manufacturing has put forward higher requirements on material performance. Composite panels have become key materials in smart manufacturing with their unique advantages. In addition, the demand for environmental protection and resource conservation has prompted people to continuously explore low-energy, high-efficiency material preparation and processing methods. The preparation process of ABA in-mold composite panels can often achieve efficient use of materials, reduce waste generation, and implement the concept of green manufacturing. At the same time, the requirements for material performance in high-end fields such as aerospace, automobile manufacturing, and architectural decoration are becoming increasingly diversified. Composite panels have become an indispensable material choice in these fields with their strong designability and adjustable performance.

[0003] In terms of processing methods, the preparation of ABA in-mold composite panels uses a variety of advanced manufacturing technologies, such as laser processing, EDM, CNC processing, etc. These technologies not only improve processing accuracy and efficiency, but also reduce production costs, and promote the large-scale production and application of composite panels. In addition, composite mold processing technology is also a key link in the processing of ABA in-mold composite panels, and its design and manufacturing level directly affects the performance and quality of the final product.

[0004] Patent CN 216100868 U discloses a composite board, comprising: a substrate layer, at least one side of the substrate layer is provided with a surface layer, the surface layer is a breathable material, an adsorption layer is provided between the surface layer and the substrate layer, the adsorption layer comprises activated carbon, and the activated carbon is grafted with amino acid substances; by using coconut shell charcoal to graft amino acid substances, a new adsorption and degradation material is formed, and it is composited with an outer plate of polypropylene material and an inner plate of polyester fiber to form a new composite board. The interior parts made of the composite board prepared by this method can achieve the effect of purifying the air in the car and improving the odor quality in the car, but the thermal insulation and sound absorption performance, strength, light diffusion performance and durability of the composite board prepared by this method still have room for improvement. Summary of the invention

[0005] The object of the present invention is to provide an ABA in-mold composite board and a processing method thereof, so as to solve the technical problems of poor thermal insulation and sound absorption, strength, light diffusion performance and durability of the composite board in the prior art.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: The invention provides an ABA in-mold composite board, comprising a surface layer and a middle layer, wherein both sides of the middle layer are tightly wrapped by the surface layer, the surface layer is prepared from 950-1000 parts of general-grade polystyrene resin and 0-50 parts of light diffusion masterbatch, and the middle layer is prepared from 890-980 parts of general-grade polystyrene resin, 1-60 parts of foaming masterbatch and 5-100 parts of light diffusion masterbatch.

[0007] Preferably, the method for preparing the light diffusion masterbatch comprises the following steps: Q1: Add titanium dioxide into a container, and at the same time add a mixed solution of silane coupling agent and deionized water, stir for reaction, centrifuge, wash, and dry to obtain modified titanium dioxide microspheres; Q2: Add modified titanium dioxide microspheres and polyvinyl pyrrolidone into a container, add a mixed solution of anhydrous ethanol and deionized water, stir, heat, drop a mixed solution of styrene and azobisisobutyronitrile, heat under nitrogen protection, react, cool, centrifuge, wash, and vacuum dry after the reaction to obtain composite microspheres; Q3: Polydimethylsiloxane and tert-butyl peroxide are mixed evenly to obtain a polydimethylsiloxane mixed solution. At the same time, the composite microspheres are mixed with the tetrahydrofuran solution, and ultrasonically dispersed to obtain a composite microsphere solution. The composite microsphere solution is added to the polydimethylsiloxane mixed solution, stirred evenly, and placed in a mold after vacuum bubbling at room temperature, and cured to obtain a light diffusion masterbatch.

[0008] Preferably, in Q1, the molar ratio of titanium dioxide to silane coupling agent is (1-2): (1.1-2.2), the stirring speed is 300-400 rpm, the reaction time is 2-3 h, the centrifugal speed is 5000-6000 rpm, the time is 30-45 min, washed with deionized water 3-5 times, and the drying temperature is 60-70°C for 10-12 h.

[0009] Preferably, in Q2, the amount ratio of modified titanium dioxide microspheres, polyvinyl pyrrolidone, anhydrous ethanol, deionized water, styrene and azobisisobutyronitrile is (4-6) g: (10-15) mL: (80-90) mL: (20-40) mL: (5-10) mL: (0.3-0.6) g, the stirring speed is 300-400 rpm, the time is 30-45 min, the temperature is raised to 60-65°C, the heating reaction temperature is 70-75°C, the time is 20-24 h, the speed is 200-300 rpm, the centrifugal speed is 8000-9000 rpm, the time is 30-45 min, the anhydrous ethanol is used for washing 3-5 times, and the vacuum drying temperature is 60-70°C for 10-12 h.

[0010] Preferably, in Q3, the dosage ratio of polydimethylsiloxane, tert-butyl peroxide, composite microspheres and tetrahydrofuran is (9-12) mL: (1-1.4) mL: (1-3) g: (10-20) mL, the ultrasonic dispersion time is 6-8 h, the vacuum bubbling time is 30-45 min, the curing temperature is 70-80 ° C, and the time is 3-4 h.

[0011] Preferably, the method for preparing the foaming masterbatch comprises the following steps: S1: adding the dried cellulose to a container, adding formic acid solution, continuing heating and stirring, then adding deionized water to terminate the reaction, centrifuging, washing, and dialyzing to obtain cellulose formate; S2: Add cellulose formate to deionized water, stir evenly, add polyurethane prepolymer, stir, and cure to obtain foaming masterbatch.

[0012] In the above process, cellulose formate is first prepared by formic acid hydrolysis, and then added into the polyurethane prepolymer as a filler to obtain a foaming masterbatch.

[0013] Preferably, in S1, the ratio of cellulose to formic acid solution is (1-2) g: (30-60) mL, the mass fraction of formic acid solution is 88 wt%, the heating and stirring temperature is 90-110°C, the time is 10-12 h, the stirring speed is 500-700 rpm, and the mixture is dialyzed with deionized water to a pH of 7-7.2; in S2, the ratio of cellulose formate, deionized water and polyurethane prepolymer is (2-4) g: (10-12) mL: (6-8) g, the stirring time is 10-12 s, the solidification temperature is 45-50°C, and the time is 20-24 h.

[0014] Preferably, the processing method of the ABA in-mold composite sheet comprises the following steps: Step (1): feed the raw materials into the feeding system, and then add them into the extruder through the proportioning, weighing and stirring system; Step (2): setting the extruder temperature, extruding into a three-layer composite mold through the cooperation of two non-exhaust single-screw extruders, and obtaining a composite board; Step (3): the composite board is rolled by a three-roll calender to obtain a board; Step (4): The sheet is cooled, cut, and stacked on a roller platform to obtain an ABA in-mold composite sheet.

[0015] Preferably, in step (2), the extruder temperature is 190-235° C., and the thickness ratio of the extruded surface layer to the middle layer is (1:5)-(1:15).

[0016] Preferably, in step (3), the rolling temperature of the three-roll calender is 80-120° C.; in step (4), the length of the roller platform is 15-40 m.

[0017] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: The present invention firstly uses titanium dioxide, silane coupling agent, styrene and polydimethylsiloxane as raw materials to prepare light diffusion masterbatch, then uses cellulose, formic acid and polyurethane prepolymer as raw materials to prepare foaming masterbatch, and uses the light diffusion masterbatch, foaming masterbatch and general-grade polystyrene resin as raw materials to prepare the ABA in-mold composite board with excellent light diffusion performance, durability, strength and heat insulation and sound absorption. The composite microspheres contained in the light diffusion masterbatch can convert point light sources or line light sources into uniform surface light sources through the scattering effect of their surface and internal structure when light enters the ABA composite board, thereby improving the light diffusion performance; the introduction of polydimethylsiloxane material can enhance the bonding force between the light diffusion masterbatch and the ABA composite board, improve the weather resistance, chemical corrosion resistance and mechanical strength of the board, help extend the service life of the board, and reduce the frequency of maintenance and replacement; polyurethane prepolymer, as one of the main components of the foaming masterbatch, has good toughness and strength, can increase the compression and bending resistance of the composite board, and the tiny bubbles in the foaming masterbatch can effectively block the heat conduction path and reduce the thermal conductivity of the material. The porous structure contained can also absorb and dissipate sound wave energy and reduce the propagation of noise. Among them, the impact strength of the ABA in-mold composite board is 3.4-3.9KJ•m-2, the thermal conductivity is 0.68-0.83W / m•K, and the sound absorption coefficient is >40dB. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a schematic diagram of the structure of the processing equipment of the ABA in-mold composite plate of the present invention; Figure 2 is a schematic diagram of the cross-sectional structure of the ABA in-mold composite plate obtained in Example 2 of the present invention; Figure 3 It is a schematic diagram of the cross-sectional structure of the ABA in-mold composite plate obtained in Example 3 of the present invention.

[0020] Description of the drawings: 1. First feed hopper, 2. Second feed hopper, 3. Surface layer material mixing zone, 4. Middle layer material mixing zone, 5. Surface layer material stirring and compression zone, 6. Middle layer material stirring and compression zone, 7. Particle conversion into fluid-like zone, 8. Surface texture transfer roller, 9. Conveyor belt zone, 10. Extrusion molding outflow zone, 1-1. First surface layer, 1-2. First middle layer, 2-1. Second surface layer, 2-2. Second middle layer. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example 1

[0022] See also Figure 1 As shown, the processing equipment structure of the ABA in-mold composite board of the present invention includes a particle conversion into a fluid-like zone 7, the top of one side of the particle conversion into a fluid-like zone 7 is connected to one end of a surface material stirring and compressing zone 5, the other end of the surface material stirring and compressing zone 5 is connected to a surface material mixing zone 3, a first feed hopper 1 is provided at the top of the surface material mixing zone 3, a bottom of one side of the particle conversion into a fluid-like zone 7 is connected to one side of an intermediate layer material stirring and compressing zone 6, the other side of the intermediate layer material stirring and compressing zone 6 is connected to an intermediate layer material mixing zone 4, a second feed hopper 2 is provided at the top of the intermediate layer material mixing zone 4, a bottom of the particle conversion into a fluid-like zone 7 is connected to an extrusion molding outflow zone 10, the extrusion molding outflow zone 10 crisscrosses through the gaps between a plurality of surface texture transfer rollers 8, and a conveyor belt zone 9 is provided at the end bottom of the extrusion molding outflow zone 10. Example 2

[0023] This embodiment discloses a method for preparing a light diffusion masterbatch, comprising the following steps: Q1: 1.5 g of titanium dioxide with a particle size of 50 nm was added to a container, and a mixed solution of 5.12 g of silane coupling agent KH570 and 10 mL of deionized water was added at the same time. After stirring at 400 rpm for 3 h, the mixture was centrifuged at 6000 rpm for 30 min, washed with deionized water for 3 times, and dried at 60 ° C for 12 h to obtain modified titanium dioxide microspheres. Q2: 5 g of modified titanium dioxide microspheres and 12.5 mL of polyvinyl pyrrolidone were added to a container, and a mixed solution of 85 mL of anhydrous ethanol and 30 mL of deionized water was added, stirred at 400 rpm for 35 min, heated to 65 ° C, and a mixed solution of 7.5 mL of styrene and 0.45 g of azobisisobutyronitrile was added dropwise. Under nitrogen protection, the mixture was heated at 75 ° C and 300 rpm for 24 h. After the reaction was completed, it was cooled, centrifuged at 8000 rpm for 45 min, washed with anhydrous ethanol 5 times, and vacuum dried at 60 ° C for 12 h to obtain composite microspheres; Q3: 10.5 mL of polydimethylsiloxane and 1.2 mL of tert-butyl peroxide were mixed evenly to obtain a polydimethylsiloxane mixed solution. At the same time, 2 g of composite microspheres were mixed with 15 mL of tetrahydrofuran solution and ultrasonically dispersed for 8 hours to obtain a composite microsphere solution. The composite microsphere solution was added to the polydimethylsiloxane mixed solution, stirred evenly, and vacuum-bubbled at room temperature for 30 minutes. The mixture was placed in a mold and cured at 75°C for 3 hours to obtain a light diffusion masterbatch.

[0024] This embodiment discloses a method for preparing a foaming masterbatch, comprising the following steps: S1: 1.5 g of dried cellulose was added to a container, and 45 mL of a formic acid solution with a mass fraction of 88 wt% was added, and the mixture was heated and stirred at 700 rpm and 100 °C for 12 h, and then 30 mL of deionized water was added to terminate the reaction, centrifuged, washed, and dialyzed with deionized water to pH = 7 to obtain cellulose formate; S2: Add 3 g of cellulose formate to 11 mL of deionized water, stir evenly, then add 7 g of polyurethane prepolymer, stir for 12 seconds, and cure at 50°C for 24 hours to obtain foaming masterbatch.

[0025] This embodiment discloses an ABA in-mold composite board, including a surface layer and a middle layer, wherein both sides of the middle layer are tightly wrapped by the surface layer, the surface layer is prepared from 980 parts of general-grade polystyrene resin and 25 parts of light diffusion masterbatch, and the middle layer is prepared from 935 parts of general-grade polystyrene resin, 30 parts of foaming masterbatch and 52 parts of light diffusion masterbatch.

[0026] This embodiment discloses a method for processing an ABA in-mold composite sheet, comprising the following steps: Step (1): feed the raw materials into the feeding system, and then add them into the extruder through the proportioning, weighing and stirring system; Step (2): setting the extruder temperature to 215°C, extruding into a three-layer composite die through the cooperation of two non-exhaust single-screw extruders, with the thickness ratio of the extruded surface layer to the middle layer being 1:10, to obtain a composite board; Step (3): the composite board is rolled at 120° C. on a three-roll calender to obtain a board; Step (4): The plate is cooled, cut, and stacked on a 30-meter roller platform to obtain an ABA in-mold composite plate. The cross-sectional schematic diagram of the ABA in-mold composite plate is as follows: Figure 2 As shown, it includes a first intermediate layer 1-2 and first surface layers 1-1 on both sides thereof. Example 3

[0027] This embodiment discloses a method for preparing a light diffusion masterbatch, comprising the following steps: Q1: 2 g of titanium dioxide with a particle size of 50 nm was added to a container, and a mixed solution of 3.14 g of silane coupling agent KH570 and 10 mL of deionized water was added at the same time. After stirring at 400 rpm for 3 h, the mixture was centrifuged at 6000 rpm for 30 min, washed with deionized water for 3 times, and dried at 60 ° C for 12 h to obtain modified titanium dioxide microspheres. Q2: 6 g of modified titanium dioxide microspheres and 10 mL of polyvinyl pyrrolidone were added to a container, and a mixed solution of 80 mL of anhydrous ethanol and 20 mL of deionized water was added, stirred at 400 rpm for 35 min, heated to 65 ° C, and a mixed solution of 5 mL of styrene and 0.6 g of azobisisobutyronitrile was added dropwise. Under nitrogen protection, the mixture was heated at 75 ° C and 300 rpm for 24 h. After the reaction was completed, it was cooled, centrifuged at 8000 rpm for 45 min, washed with anhydrous ethanol 5 times, and vacuum dried at 60 ° C for 12 h to obtain composite microspheres; Q3: Mix 9 mL of polydimethylsiloxane and 1 mL of tert-butyl peroxide to obtain a polydimethylsiloxane mixed solution. At the same time, mix 1 g of composite microspheres with 10 mL of tetrahydrofuran solution and disperse them by ultrasonic for 8 hours to obtain a composite microsphere solution. Add the composite microsphere solution to the polydimethylsiloxane mixed solution, stir evenly, and vacuum bubbling at room temperature for 30 minutes. Then, place it in a mold and cure it at 75°C for 3 hours to obtain a light diffusion masterbatch.

[0028] This embodiment discloses a method for preparing a foaming masterbatch, comprising the following steps: S1: Add 1 g of dried cellulose into a container, and add 30 mL of 88 wt% formic acid solution, continue heating and stirring at 700 rpm and 100 °C for 12 h, then add 30 mL of deionized water to terminate the reaction, centrifuge, wash, and dialyze with deionized water to pH = 7 to obtain cellulose formate; S2: Add 2 g of cellulose formate to 10 mL of deionized water, stir evenly, then add 6 g of polyurethane prepolymer, stir for 12 seconds, and cure at 50°C for 24 hours to obtain foaming masterbatch.

[0029] This embodiment discloses an ABA in-mold composite board, including a surface layer and a middle layer, wherein both sides of the middle layer are tightly wrapped by the surface layer, the surface layer is prepared from 980 parts of general-grade polystyrene resin, 25 parts of light diffusion masterbatch and 10 parts of foaming masterbatch, and the middle layer is prepared from 935 parts of general-grade polystyrene resin, 30 parts of foaming masterbatch and 52 parts of light diffusion masterbatch.

[0030] This embodiment discloses a method for processing an ABA in-mold composite sheet, comprising the following steps: Step (1): feed the raw materials into the feeding system, and then add them into the extruder through the proportioning, weighing and stirring system; Step (2): setting the extruder temperature to 215°C, extruding into a three-layer composite die through the cooperation of two non-exhaust single-screw extruders, with the thickness ratio of the extruded surface layer to the middle layer being 1:10, to obtain a composite board; Step (3): the composite board is rolled at 120° C. on a three-roll calender to obtain a board; Step (4): The plate is cooled, cut, and stacked on a 30-meter roller platform to obtain an ABA in-mold composite plate. The cross-sectional schematic diagram of the ABA in-mold composite plate is as follows: Figure 3 As shown, it includes a second middle layer 2-2 and second surface layers 2-1 on both sides thereof.

[0031] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

[0032] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. ABA in-mold composite sheet, characterized in that: It includes a surface layer and a middle layer, wherein both sides of the middle layer are tightly wrapped by the surface layer, the surface layer is prepared from 950-1000 parts of general-grade polystyrene resin and 0-50 parts of light diffusion masterbatch, and the middle layer is prepared from 890-980 parts of general-grade polystyrene resin, 1-60 parts of foaming masterbatch and 5-100 parts of light diffusion masterbatch.

2. The ABA in-mold composite sheet according to claim 1, characterized in that: The method for preparing the light diffusion masterbatch comprises the following steps: Q1: Add titanium dioxide into a container, and at the same time add a mixed solution of silane coupling agent and deionized water, stir for reaction, centrifuge, wash, and dry to obtain modified titanium dioxide microspheres; Q2: Add modified titanium dioxide microspheres and polyvinyl pyrrolidone into a container, add a mixed solution of anhydrous ethanol and deionized water, stir, heat, drop a mixed solution of styrene and azobisisobutyronitrile, heat under nitrogen protection, react, cool, centrifuge, wash, and vacuum dry after the reaction to obtain composite microspheres; Q3: Polydimethylsiloxane and tert-butyl peroxide are mixed evenly to obtain a polydimethylsiloxane mixed solution. At the same time, the composite microspheres are mixed with the tetrahydrofuran solution, and ultrasonically dispersed to obtain a composite microsphere solution. The composite microsphere solution is added to the polydimethylsiloxane mixed solution, stirred evenly, and placed in a mold after vacuum bubbling at room temperature, and cured to obtain a light diffusion masterbatch.

3. The ABA in-mold composite sheet according to claim 2, characterized in that: In the Q1, the molar ratio of titanium dioxide and silane coupling agent is (1-2): (1.1-2.2), the stirring speed is 300-400rpm, the reaction time is 2-3h, the centrifugal speed is 5000-6000rpm, the time is 30-45min, washed with deionized water 3-5 times, the drying temperature is 60-70°C, and the time is 10-12h.

4. The ABA in-mold composite sheet according to claim 2, characterized in that: In the Q2, the dosage ratio of modified titanium dioxide microspheres, polyvinyl pyrrolidone, anhydrous ethanol, deionized water, styrene and azobisisobutyronitrile is (4-6) g: (10-15) mL: (80-90) mL: (20-40) mL: (5-10) mL: (0.3-0.6) g, the stirring speed is 300-400 rpm, the time is 30-45 min, the temperature is raised to 60-65°C, the heating reaction temperature is 70-75°C, the time is 20-24 h, the speed is 200-300 rpm, the centrifugal speed is 8000-9000 rpm, the time is 30-45 min, and the anhydrous ethanol is used for washing 3-5 times. The vacuum drying temperature is 60-70°C and the time is 10-12 h.

5. The ABA in-mold composite sheet according to claim 2, characterized in that: In the Q3, the dosage ratio of polydimethylsiloxane, tert-butyl peroxide, composite microspheres and tetrahydrofuran is (9-12) mL: (1-1.4) mL: (1-3) g: (10-20) mL, the ultrasonic dispersion time is 6-8 h, the vacuum bubbling time is 30-45 min, the curing temperature is 70-80° C., and the time is 3-4 h.

6. The ABA in-mold composite sheet according to claim 1, characterized in that: The method for preparing the foaming masterbatch comprises the following steps: S1: adding the dried cellulose to a container, adding formic acid solution, continuing heating and stirring, then adding deionized water to terminate the reaction, centrifuging, washing, and dialyzing to obtain cellulose formate; S2: Add cellulose formate to deionized water, stir evenly, add polyurethane prepolymer, stir, and cure to obtain foaming masterbatch.

7. The ABA in-mold composite sheet according to claim 6, characterized in that: In the S1, the dosage ratio of cellulose to formic acid solution is (1-2) g: (30-60) mL, the mass fraction of formic acid solution is 88 wt%, the heating and stirring temperature is 90-110° C., the time is 10-12 h, the stirring speed is 500-700 rpm, and the mixture is dialyzed with deionized water to a pH value of 7-7.2; in the S2, the dosage ratio of cellulose formate, deionized water and polyurethane prepolymer is (2-4) g: (10-12) mL: (6-8) g, the stirring time is 10-12 s, the solidification temperature is 45-50° C., and the time is 20-24 h.

8. A method for processing an ABA in-mold composite sheet according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step (1): feeding the raw materials into the feeding system, and adding them into the extruder through the proportioning, weighing and stirring system; Step (2): setting the extruder temperature, extruding into a three-layer composite mold through the cooperation of two non-exhaust single-screw extruders, and obtaining a composite board; Step (3): the composite board is rolled by a three-roll calender to obtain a board; Step (4): The sheet is cooled on a roller platform, cut, and stacked to obtain an ABA in-mold composite sheet.

9. The processing method of ABA in-mold composite sheet according to claim 8, characterized in that: In the step (2), the extruder temperature is 190-235° C., and the thickness ratio of the extruded surface layer to the middle layer is (1:5)-(1:15).

10. The processing method of ABA in-mold composite sheet according to claim 8, characterized in that: In the step (3), the rolling temperature of the three-roll calender is 80-120° C.; in the step (4), the length of the roller platform is 15-40 m.

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