Composite environment-friendly PET (Polyethylene Terephthalate) long fiber high-resilience light-weight vehicle roof and preparation method thereof

Abstract

The invention discloses a composite environment-friendly PET long fiber high-resilience light-weight car roof and a preparation method thereof, and belongs to the technical field of car roof preparation, the car roof comprises a car roof plate and an interior trimming panel, the car roof plate comprises a bottom plate, a plurality of blocks are fixedly connected to the upper portion of the bottom plate, the blocks are fixedly connected through connecting strips, and the interior trimming panel is fixedly connected to the bottom plate. A top plate is fixedly connected to the upper portion of the block, and a paint layer is sprayed to the top of the top plate. The automobile roof comprises a bottom plate and an inner decorative plate, the inner decorative plate comprises a decorative plate, the decorative plate is fixedly connected to the lower portion of the bottom plate, and a filling layer and inner decorative cloth are sequentially arranged below the decorative plate. Compared with a traditional iron automobile roof, the automobile roof is made of a PET fiberboard, the heat conduction efficiency is low, the automobile roof is of a multi-layer structure, and the service life of the automobile roof is prolonged. A plurality of air grids are arranged in the roof plate, so that heat can be further insulated, and the compressive strength of the roof plate can be enhanced.

Description

Technical Field

[0001] The invention relates to the technical field of automobile ceiling preparation, and in particular to a composite environment-friendly PET long fiber high-resilience lightweight automobile ceiling and a preparation method thereof. Background Art

[0002] The car ceiling, also often called the car interior ceiling or roof lining, is a decorative covering above the interior of the car, usually made of fabric, foam, plastic or other materials. Its main function is not only to beautify the interior space of the car, but also to absorb sound, insulate heat and protect the occupants from direct sunlight.

[0003] Most existing cars use iron sheets as roof materials, or use glass sunroofs instead of iron roofs. Glass sunroofs or iron roofs have high heat conduction efficiency, which leads to high temperatures inside the car in summer and accelerates the aging of plastic parts inside the car. Before starting the car each time, the car air conditioner needs to be turned on for a long time of cooling before getting in the car and driving, which seriously affects people's travel experience.

[0004] Traditional car roof interior materials are flammable. Once a fire occurs inside the car, it will quickly ignite the car roof, causing a deflagration, leaving the people inside the car with no time to escape. Therefore, car interior materials with flame retardant properties are needed to improve the safety of the car. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a composite environmentally friendly PET long fiber high-resilience lightweight vehicle ceiling and a preparation method thereof.

[0006] The technical solution of the present invention is: a composite environmentally friendly PET long fiber high-resilience lightweight vehicle ceiling, including a roof panel and an interior panel, the roof panel includes a bottom panel, a plurality of blocks are fixedly connected above the bottom panel, the blocks are fixedly connected by connecting strips, a top panel is fixedly connected above the blocks, and a paint layer is sprayed on the top of the top panel; the interior panel includes a decorative panel, the decorative panel is fixedly connected below the bottom panel, and a filling layer and an interior fabric are sequentially arranged below the decorative panel.

[0007] Furthermore, the preparation method of the composite environmentally friendly PET long fiber high-resilience lightweight vehicle ceiling comprises the following steps:

[0008] S1. Weaving PET long fibers into PET fiber cloth in the vertical and horizontal directions, and completely immersing the PET fiber cloth in a binder at a temperature of 20-30° C. for 3-5 min to obtain a pre-impregnated fiber cloth. Then, the pre-impregnated fiber cloth is stacked, the number of stacked layers is 2-3, and the thickness of a single layer of pre-impregnated fiber cloth is 0.8-1.2 mm. After the stacking is completed, the pre-impregnated fiber cloth is placed in a hot press machine for heat fixing treatment, and a fiberboard is obtained after the heat fixing treatment; the structure of the fiberboard includes a Z-type board, a flat board, a top board and a bottom board;

[0009] S2, cutting the Z-shaped plate to obtain a block, cutting the flat plate to obtain a connecting strip, slotting the block and the connecting strip, then clamping the block and the connecting strip to each other to obtain a clamping frame, respectively impregnating the upper surface and the lower surface of the clamping frame with a binder, and then sequentially bonding the top plate, the clamping frame, and the bottom plate in order from top to bottom to obtain a roof plate;

[0010] S3, placing the pulp into a decorative board mold for hot pressing and shaping treatment, squeezing out excess water in the pulp to obtain a shaped decorative board with a humidity of 5-10%, drying the decorative board at an ambient temperature of 50-80°C, immersing the shaped decorative board in an aerogel coating, making the aerogel coating evenly adhere to the surface of the decorative board, then taking it out, and obtaining the decorative board after the aerogel coating is dried;

[0011] S4. After the decorative panel and the roof panel are fixedly connected, a filling layer is formed by gluing a flame retardant sponge at the bottom of the decorative panel, and then the interior fabric is glued to the bottom of the flame retardant sponge. After the roof panel is spray-painted to form a paint layer, the car roof is obtained.

[0012] Furthermore, the binder is composed of the following components in percentage by mass: 40-45% of silicone-modified epoxy resin, 30-40% of polyamide 650, and the balance of polypropylene glycol diglycidyl ether.

[0013] Description: Silicone epoxy resin adhesive has large bonding force and high bonding strength. It releases almost no low molecular weight products during curing, and its linear expansion coefficient is little affected by temperature. Therefore, the bonded parts have good dimensional stability. It has good chemical resistance in a variety of chemical media, including seawater, petroleum, kerosene, acid, alkali, etc., and its performance remains stable.

[0014] Furthermore, the heat fixing treatment is to put the stacked preimpregnated fiber cloth into a mold for hot pressing, the hot pressing temperature is 80-120°C, the pressure in the mold is 40-45Mpa, the hot pressing is maintained for 20-30min, and after the hot pressing is completed, the demolding treatment is performed to obtain the fiberboard.

[0015] Description: The fiberboard is cured into a specific shape through heat-setting treatment. Under the above heat-setting parameters, the fiberboard is compact and has high compressive strength.

[0016] Furthermore, during the bonding process, the top plate, the clamping frame, and the connection of the bottom plate are coated with adhesive, and then placed in a mold, a pressure of 30-40Mpa is applied to the mold, and the mold is demoulded after being maintained at an ambient temperature of 80-100°C for 10-15 minutes.

[0017] Description: The top plate, the clamping frame and the bottom plate are fixed to each other by gluing. Under the above pressure, no gap is generated at the gluing point, and the gluing effect is good.

[0018] Furthermore, the hot pressing shaping is to introduce the pulp into the mold, then close the mold, and apply a pressure of 5-8MPa to the mold to squeeze out the water in the pulp. After extrusion, the mold is heated to 100-120°C, maintained for 5-10 minutes, and then demolding is performed.

[0019] Description: By applying pressure to the mold, the water in the pulp is squeezed out first, and then the mold is heated to increase the temperature of the water in the pulp. After demolding, the water in the pulp evaporates quickly, so that the pulp is pressed into a specific shape and maintained.

[0020] Furthermore, the aerogel coating is composed of the following ingredients in percentage by mass: 30-35% SiC-SiO2 composite aerogel, 28-30% polyether modified polydimethylsiloxane solution, 4-5% alumina powder, 1-3% alcohol ester-12, 2-4% Digo 825, 5-8% methyl cellulose, and the balance is deionized water.

[0021] Description: Aerogel coating can protect the trim from being eaten by insects. Aerogel coating can play a fire retardant and heat-insulating effect, making the car roof have a better thermal insulation effect.

[0022] Furthermore, the interior fabric is woven by mixing flame-retardant modified polyester fiber and ES fiber in a mass ratio of 1:1.

[0023] Note: The interior fabric is made of flame-retardant fiber, which can provide sufficient escape time for people in the car after a fire occurs.

[0024] Furthermore, the flame retardant sponge is composed of the following ingredients in percentage by mass: 35-40% vinyl polymer grafted polyether polyol, 22-32% isophorone diisocyanate, 1-3% aluminum hydroxide powder, 3-5% silicon dioxide powder, 3-5% silicone foam stabilizer, 5-7% sodium bicarbonate, 1-2% octylated diphenylamine, and the balance is deionized water.

[0025] Note: The role of flame retardant sponge and interior fabric is to prevent explosion in the car to a certain extent, providing sufficient time for people in the car to escape.

[0026] Furthermore, the preparation method of the flame retardant sponge is as follows: vinyl polymer grafted polyether polyol, isophorone diisocyanate, aluminum hydroxide powder, silicon dioxide powder, silicone foam stabilizer, sodium bicarbonate, octylated diphenylamine, and deionized water are mixed at 20-30°C, the mixer speed is 120-180r / min, the mixing time is 10-15min, and a mixed slurry is obtained after the mixing is completed. The mixed slurry is allowed to stand for 5-10min at an ambient temperature of 20-30°C and then introduced into a horizontal foaming machine for foaming. The foaming temperature of the horizontal foaming machine is 75-80°C, the foaming machine speed is 2000-2500r / min, and the foaming time is 20-30min. After the foaming is completed, the slurry is injected into a mold, and the mold is demolded after aging at an ambient temperature of 50-60°C for 3-4h to obtain a flame retardant sponge.

[0027] Description: The flame retardant sponge has high resilience and high flame retardant effect.

[0028] The beneficial effects of the present invention are:

[0029] Compared with the traditional iron car roof, the car roof of the present invention is made of PET fiberboard with low heat conduction efficiency. The car roof adopts a multi-layer structure and is provided with a plurality of air blocks inside, which can further insulate and enhance the compressive strength of the car roof. The interior trim is pressed from pulp and is more environmentally friendly. The waterproof, heat-insulating and fire-resistant properties of the interior trim are enhanced by aerogel coating. The flame-retardant sponge and the interior trim cloth with flame-retardant function are not easy to explode after a fire occurs in the car, which provides sufficient time for the escape of the people in the car and improves the safety of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of the present invention.

[0031] Figure 2 It is a top view of the connection between the block and the connecting strip.

[0032] Among them, 1-roof panel, 2-interior panel, 11-bottom panel, 12-blocking, 13-connecting strip, 14-top panel, 15-paint layer, 21-decorative panel, 22-filling layer, 23-interior cloth. DETAILED DESCRIPTION

[0033] Embodiment 1:

[0034] like Figure 1As shown, the composite environmentally friendly PET long fiber high-resilience lightweight vehicle ceiling includes a roof panel 1 and an interior panel 2. The roof panel 1 includes a bottom panel 11, and a plurality of blocks 12 are fixedly connected to the top of the bottom panel 11. The blocks 12 are fixedly connected by connecting strips 13. A top panel 14 is fixedly connected to the top of the blocks 12, and a paint layer 15 is sprayed on the top of the top panel 14. The interior panel 2 includes a decorative panel 21, and the decorative panel 21 is fixedly connected to the bottom of the bottom panel 11. A filling layer 22 and an interior fabric 23 are arranged in sequence below the decorative panel 21.

[0035] Embodiment 2:

[0036] This embodiment describes a method for preparing the composite environment-friendly PET long fiber high-resilience lightweight vehicle ceiling of embodiment 1, comprising the following steps:

[0037] S1. Weaving PET long fibers into PET fiber cloth in the vertical and horizontal directions, and immersing the entire PET fiber cloth in a binder at a temperature of 20° C. for 3 min to obtain a pre-impregnated fiber cloth. The pre-impregnated fiber cloth is then stacked, with two layers stacked, and the thickness of a single layer of pre-impregnated fiber cloth is 0.8 mm. After the stacking is completed, the pre-impregnated fiber cloth is placed in a hot press machine for heat-fixing treatment, and a fiberboard is obtained after the heat-fixing treatment;

[0038] The structure of the fiberboard includes a z-shaped board, a flat board, a top board 14 and a bottom board 11;

[0039] The heat fixation treatment is to put the stacked pre-impregnated fiber cloth into a mold for hot pressing. The hot pressing temperature is 80°C, the pressure in the mold is 40Mpa, and the hot pressing time is 20 minutes. After the hot pressing is completed, the demoulding treatment is performed to obtain the fiberboard.

[0040] The fiberboard is cured into a specific shape through heat setting treatment. Under the above heat setting parameters, the formed fiberboard is compact and has high compressive strength.

[0041] The binder is composed of the following ingredients in percentage by mass: 40% silicone modified epoxy resin, 30% polyamide 650, and the balance polypropylene glycol diglycidyl ether; the silicone epoxy resin binder has large bonding force and high bonding strength, releases almost no low molecular weight products during curing, and the linear expansion coefficient is little affected by temperature. Therefore, the bonded parts have good dimensional stability and have good chemical resistance in a variety of chemical media, including seawater, petroleum, kerosene, acid, alkali, etc., and the performance remains stable.

[0042] S2, cutting the Z-shaped plate to obtain the block 12, cutting the flat plate to obtain the connecting strip 13, slotting the block 12 and the connecting strip 13, then clamping the block 12 and the connecting strip 13 to each other to obtain a clamping frame, respectively impregnating the upper surface and the lower surface of the clamping frame with a binder, and then sequentially bonding the top plate 14, the clamping frame, and the bottom plate 11 from top to bottom to obtain the roof plate 1;

[0043] During the gluing process, the top plate 14, the clamping frame, and the connection of the bottom plate 11 are coated with adhesive, and then placed in a mold. A pressure of 30Mpa is applied to the mold. The mold is kept at an ambient temperature of 80°C for 10 minutes and then demolded. The top plate 14, the clamping frame, and the bottom plate 11 are fixed to each other through the gluing process. Under the above pressure, no gaps are generated at the gluing points, and the gluing effect is good.

[0044] S3, putting the pulp into the mold of the decorative board 21 for hot pressing and shaping treatment, squeezing out excess water in the pulp to obtain a shaped decorative board with a humidity of 5%, drying the decorative board at an ambient temperature of 50°C, and then immersing the shaped decorative board in the aerogel coating to make the aerogel coating evenly adhere to the surface of the decorative board 21, then taking it out, and after the aerogel coating is dried, obtaining the decorative board 21;

[0045] Hot pressing is to introduce the pulp into the mold, then close the mold and apply a pressure of 5MPa to the mold to squeeze out the water in the pulp. After extrusion, the mold is heated to 100℃ and kept for 5 minutes before demolding. The water in the pulp is squeezed out by applying pressure to the mold, and then the mold is heated to raise the temperature of the water in the pulp. After demolding, the water in the pulp evaporates quickly, so that the pulp is pressed into a specific shape and maintained.

[0046] The aerogel coating is composed of the following ingredients in percentage by mass: 30% SiC-SiO2 composite aerogel, 28% polyether modified polydimethylsiloxane solution, 4% alumina powder, 1% alcohol ester-12, 2% Digo 825, 5% methyl cellulose, and the balance is deionized water; the aerogel coating can protect the decorative panel from being eaten by insects, and the aerogel coating can have fire retardant and heat-insulating effects, so that the car roof has better heat insulation effect.

[0047] S4. After the decorative panel 21 and the roof panel 1 are fixedly connected, a filling layer 22 is formed by gluing a flame-retardant sponge at the bottom of the decorative panel 21, and then the interior fabric 23 is glued to the bottom of the flame-retardant sponge. After the top panel 14 is spray-painted to form a paint layer 15, a car ceiling is obtained; the paint layer 15 is 0.8 mm thick, the decorative panel 21 is 2 mm thick, the interior fabric 23 is 1 mm thick, the filling layer 22 is 2 cm thick, and the roof panel is 1 cm thick.

[0048] The interior fabric 23 is woven by mixing flame-retardant modified polyester fiber and ES fiber in a mass ratio of 1:1. The interior fabric 23 is made of flame-retardant fiber, which can provide sufficient escape time for the occupants in the vehicle after a fire occurs in the vehicle.

[0049] The flame retardant sponge is composed of the following ingredients in percentage by mass: 35% vinyl polymer grafted polyether polyol, 22% isophorone diisocyanate, 1% aluminum hydroxide powder, 3% silicon dioxide powder, 3% silicone foam stabilizer, 5% sodium bicarbonate, 1% octylated diphenylamine, and the balance is deionized water; the role of the flame retardant sponge and the role of the interior fabric are to prevent the explosion in the car to a certain extent, providing sufficient time for the occupants to escape;

[0050] Preparation method of flame retardant sponge: vinyl polymer grafted polyether polyol, isophorone diisocyanate, aluminum hydroxide powder, silica powder, silicone foam stabilizer, sodium bicarbonate, octylated diphenylamine, and deionized water are mixed at 20°C, the mixer speed is 120r / min, the mixing time is 10min, and a mixed slurry is obtained after the mixing is completed. The mixed slurry is allowed to stand for 5min at an ambient temperature of 20°C and then introduced into a horizontal foaming machine for foaming. The foaming temperature of the horizontal foaming machine is 75°C, the foaming machine speed is 2000r / min, and the foaming time is 20min. After the foaming is completed, the slurry is injected into a mold, and demolded after aging at an ambient temperature of 50°C for 3h to obtain a flame retardant sponge.

[0051] Embodiment 3:

[0052] Based on Example 2, Example 3 is different from Example 2 in that:

[0053] S1. Weaving PET long fibers into PET fiber cloth in the vertical and horizontal directions, and completely immersing the PET fiber cloth in a binder at a temperature of 22° C. for 4 minutes to obtain a pre-impregnated fiber cloth. Then, the pre-impregnated fiber cloth is stacked, the number of stacked layers is 3, and the thickness of a single layer of pre-impregnated fiber cloth is 1.0 mm. After the stacking is completed, the pre-impregnated fiber cloth is placed in a hot press machine for heat fixing treatment, and a fiberboard is obtained after the heat fixing treatment;

[0054] The heat fixation treatment is to put the stacked pre-impregnated fiber cloth into a mold for hot pressing. The hot pressing temperature is 90°C, the pressure in the mold is 43Mpa, and the hot pressing time is 28 minutes. After the hot pressing is completed, the demoulding treatment is performed to obtain the fiberboard.

[0055] The binder is composed of the following components in percentage by mass: 43% silicone-modified epoxy resin, 35% polyamide 650, and the balance polypropylene glycol diglycidyl ether;

[0056] During the gluing treatment, the top plate 14, the clamping frame, and the joints of the bottom plate 11 are coated with a binder, and then placed in a mold, a pressure of 35 MPa is applied to the mold, and the mold is demoulded after being kept at an ambient temperature of 99° C. for 13 minutes;

[0057] S3, putting the pulp into the mold of the decorative board 21 for hot pressing and shaping treatment, squeezing out excess water in the pulp to obtain a shaped decorative board with a humidity of 8%, drying the decorative board at an ambient temperature of 60°C, and then immersing the shaped decorative board in the aerogel coating to make the aerogel coating evenly adhere to the surface of the decorative board 21, then taking it out, and obtaining the decorative board 21 after the aerogel coating is dried;

[0058] Hot pressing is to introduce the pulp into the mold, then close the mold and apply a pressure of 6MPa to the mold to squeeze out the water in the pulp. After extrusion, the mold is heated to 110℃ and kept for 8 minutes before demoulding.

[0059] The aerogel coating is composed of the following components in percentage by mass: 32% SiC-SiO2 composite aerogel, 29% polyether-modified polydimethylsiloxane solution, 4.5% alumina micropowder, 1.3% alcohol ester-12, 2.4% Digo 825, 6.6% methyl cellulose, and the balance is deionized water;

[0060] The thickness of the paint layer 15 is 1 mm, the thickness of the decorative plate 21 is 2.5 mm, the thickness of the interior fabric 23 is 1 mm, the thickness of the filling layer 22 is 2.5 cm, and the thickness of the roof panel is 1.1 cm;

[0061] The flame retardant sponge is composed of the following components in percentage by mass: 38% vinyl polymer grafted polyether polyol, 30% isophorone diisocyanate, 2.2% aluminum hydroxide powder, 3.3% silicon dioxide powder, 4.3% silicone foam stabilizer, 6.1% sodium bicarbonate, 1.3% octylated diphenylamine, and the balance is deionized water;

[0062] Preparation method of flame retardant sponge: vinyl polymer grafted polyether polyol, isophorone diisocyanate, aluminum hydroxide powder, silica powder, silicone foam stabilizer, sodium bicarbonate, octylated diphenylamine, and deionized water are mixed at 25°C, the mixer speed is 160r / min, the mixing time is 13min, and a mixed slurry is obtained after the mixing is completed. The mixed slurry is allowed to stand for 8min at an ambient temperature of 25°C and then introduced into a horizontal foaming machine for foaming. The foaming temperature of the horizontal foaming machine is 78°C, the foaming machine speed is 2300r / min, and the foaming time is 28min. After the foaming is completed, the slurry is injected into a mold, and the mold is demolded after aging at an ambient temperature of 58°C for 3.5h to obtain a flame retardant sponge.

[0063] Embodiment 4:

[0064] Based on Example 2, Example 4 is different from Example 2 in that:

[0065] S1. Weaving PET long fibers into PET fiber cloth in the vertical and horizontal directions, and completely immersing the PET fiber cloth in a binder at a temperature of 30° C. for 5 min to obtain a pre-impregnated fiber cloth. Then, the pre-impregnated fiber cloth is stacked, the number of stacked layers is 3, and the thickness of a single layer of pre-impregnated fiber cloth is 1.2 mm. After the stacking is completed, the pre-impregnated fiber cloth is placed in a hot press machine for heat fixation treatment, and a fiberboard is obtained after the heat fixation treatment;

[0066] The heat fixation treatment is to put the stacked pre-impregnated fiber cloth into a mold for hot pressing. The hot pressing temperature is 120°C, the pressure in the mold is 45Mpa, and the hot pressing time is 30 minutes. After the hot pressing is completed, the demoulding treatment is performed to obtain the fiberboard;

[0067] The binder is composed of the following components in percentage by mass: 45% silicone-modified epoxy resin, 40% polyamide 650, and the balance polypropylene glycol diglycidyl ether;

[0068] During the gluing treatment, the top plate 14, the clamping frame, and the joints of the bottom plate 11 are coated with a binder, and then placed in a mold, a pressure of 40 MPa is applied to the mold, and the mold is demoulded after being kept at an ambient temperature of 100° C. for 15 minutes;

[0069] S3, putting the pulp into the mold of the decorative board 21 for hot pressing and shaping treatment, squeezing out excess water in the pulp to obtain a shaped decorative board with a humidity of 10%, drying the decorative board at an ambient temperature of 80°C, and then immersing the shaped decorative board in the aerogel coating to make the aerogel coating evenly adhere to the surface of the decorative board 21, then taking it out, and after the aerogel coating is dried, obtaining the decorative board 21;

[0070] Hot pressing is to introduce the pulp into the mold, then close the mold and apply a pressure of 8MPa to the mold to squeeze out the water in the pulp. After extrusion, the mold is heated to 120℃ and kept for 10 minutes before demoulding.

[0071] The aerogel coating is composed of the following components in percentage by mass: 35% SiC-SiO2 composite aerogel, 30% polyether modified polydimethylsiloxane solution, 5% alumina powder, 3% alcohol ester-12, 4% Digo 825, 8% methyl cellulose, and the balance is deionized water;

[0072] The thickness of the paint layer 15 is 1.2 mm, the thickness of the decorative plate 21 is 3 mm, the thickness of the interior fabric 23 is 1 mm, the thickness of the filling layer 22 is 3 cm, and the thickness of the roof plate is 1.2 cm;

[0073] The flame retardant sponge is composed of the following components in percentage by mass: 40% vinyl polymer grafted polyether polyol, 32% isophorone diisocyanate, 3% aluminum hydroxide powder, 5% silicon dioxide powder, 5% organic silicon foam stabilizer, 7% sodium bicarbonate, 2% octylated diphenylamine, and the balance is deionized water;

[0074] Preparation method of flame retardant sponge: vinyl polymer grafted polyether polyol, isophorone diisocyanate, aluminum hydroxide powder, silica powder, silicone foam stabilizer, sodium bicarbonate, octylated diphenylamine, and deionized water are mixed at 30°C, the mixer speed is 180r / min, the mixing time is 15min, and a mixed slurry is obtained after the mixing is completed. The mixed slurry is allowed to stand for 10min at an ambient temperature of 30°C and then introduced into a horizontal foaming machine for foaming. The foaming temperature of the horizontal foaming machine is 80°C, the foaming machine speed is 2500r / min, and the foaming time is 30min. After the foaming is completed, the slurry is injected into a mold, and demolded after aging at an ambient temperature of 60°C for 3-4h to obtain a flame retardant sponge.

[0075] The compressive strength comparison of the automobile roofs prepared by Example 2 to Example 4 is shown in Table 1. It can be found from Table 1 that the automobile roof prepared by Example 4 has the best compressive strength, so Example 4 is the best example.

[0076] Table 1: Comparison of compressive strength of automobile roofs in Example 2-Example 4:

[0077] Example Example 2 Example 3 Example 4 Compressive strength(Mpa) 210 220 230

Claims

1. Composite environmentally friendly PET long fiber high resilience lightweight vehicle ceiling, characterized in that: The invention comprises a roof panel (1) and an interior panel (2), wherein the roof panel (1) comprises a bottom panel (11), a plurality of blocks (12) are fixedly connected above the bottom panel (11), the blocks (12) are fixedly connected to each other via connecting strips (13), a top panel (14) is fixedly connected above the blocks (12), and a paint layer (15) is sprayed on the top of the top panel (14); and the interior panel (2) comprises a decorative panel (21), the decorative panel (21) is fixedly connected below the bottom panel (11), and a filling layer (22) and an interior fabric (23) are sequentially arranged below the decorative panel (21).

2. The method for preparing the composite environment-friendly PET long fiber high-resilience lightweight vehicle ceiling according to claim 1, characterized in that: The following steps are involved: S1, weaving PET long fibers into PET fiber cloth in the vertical and horizontal directions, and completely immersing the PET fiber cloth in a binder at a temperature of 20-30° C. for 3-5 minutes to obtain a pre-impregnated fiber cloth, and then stacking the pre-impregnated fiber cloth, the number of stacked layers is 2-3 layers, and the thickness of a single layer of pre-impregnated fiber cloth is 0.8-1.2 mm. After the stacking is completed, the pre-impregnated fiber cloth is placed in a hot press machine for heat fixing treatment, and a fiberboard is obtained after the heat fixing treatment; the structure of the fiberboard includes a Z-shaped plate, a flat plate, a top plate (14) and a bottom plate (11); S2, cutting the Z-shaped plate to obtain a block (12), cutting the flat plate to obtain a connecting strip (13), slotting the block (12) and the connecting strip (13), then clamping the block (12) and the connecting strip (13) to each other to obtain a clamping frame, respectively impregnating the upper surface and the lower surface of the clamping frame with a binder, and then sequentially bonding the top plate (14), the clamping frame, and the bottom plate (11) in order from top to bottom to obtain a roof plate (1); S3, placing the pulp into a decorative board (21) mold for hot pressing and shaping treatment, squeezing out excess water in the pulp to obtain a shaped decorative board with a humidity of 5-10%, drying the decorative board at an ambient temperature of 50-80° C., immersing the shaped decorative board in an aerogel coating, allowing the aerogel coating to evenly adhere to the surface of the decorative board (21), then taking it out, and obtaining the decorative board (21) after the aerogel coating is dried; S4, after the decorative panel (21) and the roof panel (1) are fixedly connected, a filling layer (22) is formed by gluing a flame retardant sponge at the bottom of the decorative panel (21), and then an interior fabric (23) is glued to the bottom of the flame retardant sponge, and the top panel (14) is spray-painted to form a paint layer (15), thereby obtaining a car roof.

3. The method for preparing the composite environment-friendly PET long fiber high-resilience lightweight vehicle ceiling according to claim 2, characterized in that: The binder is composed of the following components in percentage by mass: 40-45% of silicone-modified epoxy resin, 30-40% of polyamide 650, and the balance of polypropylene glycol diglycidyl ether.

4. The method for preparing the composite environment-friendly PET long fiber high-resilience lightweight vehicle ceiling according to claim 2, characterized in that: The heat fixing treatment is to put the stacked pre-impregnated fiber cloth into a mold for hot pressing, the hot pressing temperature is 80-120°C, the pressure in the mold is 40-45Mpa, the hot pressing is maintained for 20-30min, and after the hot pressing is completed, the demoulding treatment is performed to obtain the fiberboard.

5. The method for preparing the composite environment-friendly PET long fiber high-resilience lightweight vehicle ceiling according to claim 2, characterized in that: During the bonding treatment, the top plate (14), the clamping frame, and the bottom plate (11) are coated with adhesive, and then placed in a mold. A pressure of 30-40Mpa is applied to the mold, and the mold is demoulded after being kept at an ambient temperature of 80-100°C for 10-15 minutes.

6. The method for preparing the composite environment-friendly PET long fiber high-resilience lightweight vehicle ceiling according to claim 2, characterized in that: The hot pressing shaping is to introduce the pulp into the mold, then close the mold, and apply a pressure of 5-8MPa to the mold to squeeze out the water in the pulp. After extrusion, the mold is heated to 100-120°C, maintained for 5-10 minutes, and then demolding is performed.

7. The method for preparing the composite environment-friendly PET long fiber high-resilience lightweight vehicle ceiling according to claim 2, characterized in that: The aerogel coating is composed of the following components in percentage by mass: 30-35% SiC-SiO2 composite aerogel, 28-30% polyether modified polydimethylsiloxane solution, 4-5% alumina micropowder, 1-3% alcohol ester-12, 2-4% Digo 825, 5-8% methyl cellulose, and the balance is deionized water.

8. The method for preparing the composite environment-friendly PET long fiber high-resilience lightweight vehicle ceiling according to claim 2, characterized in that: The interior fabric (23) is woven by mixing flame-retardant modified polyester fiber and ES fiber in a mass ratio of 1:

1.

9. The method for preparing the composite environment-friendly PET long fiber high-resilience lightweight vehicle ceiling according to claim 2, characterized in that: The flame retardant sponge is composed of the following components in percentage by mass: 35-40% of vinyl polymer grafted polyether polyol, 22-32% of isophorone diisocyanate, 1-3% of aluminum hydroxide powder, 3-5% of silicon dioxide powder, 3-5% of organic silicon foam stabilizer, 5-7% of sodium bicarbonate, 1-2% of octylated diphenylamine, and the balance is deionized water.

10. The method for preparing the composite environment-friendly PET long fiber high-resilience lightweight vehicle ceiling according to claim 2, characterized in that: The flame retardant sponge is composed of the following components in percentage by mass: 35-40% of vinyl polymer grafted polyether polyol, 22-32% of isophorone diisocyanate, 1-3% of aluminum hydroxide powder, 3-5% of silicon dioxide powder, 3-5% of organic silicon foam stabilizer, 5-7% of sodium bicarbonate, and the balance is deionized water.

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