Automobile spare tire cover plate and production process thereof

Abstract

The invention relates to the technical field of automotive upholstery, and provides an automobile spare tire cover plate and a production process thereof.A first PP plate, a glass fiber reinforced PP glass fiber plate and a second PP plate are arranged on the two sides of a PP honeycomb core, and due to the fact that a layer of honeycomb structure is arranged to be matched with the two layers of glass fiber reinforced PP glass fiber plates, the compressive strength and the shear strength are further improved, the energy absorption performance is more excellent, and the service life of the automobile spare tire cover plate is prolonged. The sound insulation and noise reduction functions are also improved; four layers of PP plates are arranged, so that the waterproof and moistureproof performance is excellent. The PP honeycomb core, the first PP plate, the second PP plate and the glass fiber reinforced PP glass fiber plate are sequentially manufactured, and then the plate layers are heated and pressurized through a spare tire cover plate mold to be mutually fused and bonded together, so that glue is not used, the environmental protection property is good, and peculiar smell is avoided; and the glass fiber reinforced PP glass fiber plate is molded by a compression molding machine. The fiber distribution is isotropic, and the impact strength is higher than that of an injection molding process.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile interior decoration parts, and in particular to an automobile spare tire cover and a production process thereof. Background Art

[0002] Automotive interior components are crucial to a car, including the spare tire cover. This crucial component, located at the bottom of the vehicle's trunk, serves the following primary functions: covering the spare tire compartment, maintaining a clean and tidy trunk and preventing the spare tire from being exposed; and serving as a support platform for luggage and other items, requiring a certain level of compressive strength. Currently, most spare tire covers feature a honeycomb structure. However, existing spare tire covers still lack the required strength, and spray-coated products can produce a strong odor and poor sound insulation. Therefore, addressing this issue is crucial. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a spare tire cover for an automobile and a production process thereof, which solves the problems in the background technology.

[0004] Based on the above objectives, the present invention provides a spare tire cover for an automobile, comprising a PP honeycomb core in the middle, PP panels 1 being arranged on both sides of the PP honeycomb core, a glass fiber reinforced PP fiberglass panel being arranged on the side of the PP panel 1 away from the PP honeycomb core, a PP panel 2 being arranged on the side of the glass fiber reinforced PP fiberglass panel away from the PP panel 1, and a decorative layer being arranged on the side of the PP panel 2 away from the PP fiberglass honeycomb panel; the PP honeycomb core is a hexagonal honeycomb structure and adopts high molecular weight, high crystallinity polypropylene; the glass fiber of the glass fiber reinforced PP fiberglass panel is long glass fiber.

[0005] Preferably, the PP honeycomb core raw material includes: 50-110 parts by weight of polypropylene, 1-5 parts by weight of ethylene-octene copolymer, 10-20 parts by weight of mica powder, 0.1-2 parts by weight of antioxidant 1010, 0.2-3 parts by weight of odor adsorbent, and 1%-2% of white oil based on the mass of mica powder.

[0006] Preferably, the length of the long glass fibers of the glass fiber reinforced PP glass fiber board is 10-25 mm.

[0007] Preferably, the glass fiber reinforced PP glass fiber board has a long glass fiber content of 10-30%.

[0008] A production process for a spare tire cover for an automobile comprises the following steps: Step 1: preparing a PP honeycomb core: preparing PP honeycomb core raw materials, mixing the PP honeycomb core raw materials in proportion, and extruding the honeycomb core blank through an extruder with a hexagonal honeycomb mold; Step 2, preparing PP board 1 and PP board 2: extruding PP board 1 and PP board 2 through an extruder; Step 3: preparing a glass fiber reinforced PP glass fiber board: forming the glass fiber reinforced PP glass fiber board by a compression molding machine; Step 4, pressing and molding: preheat the mold for pressing the spare tire cover, put a decorative layer into the mold, then place PP board 2, then lay glass fiber reinforced PP fiberglass board, then place PP board 1, and then place the PP honeycomb core in the middle position, and then lay PP board 1, glass fiber reinforced PP fiberglass board and PP board 2 on the other side in sequence, and finally cover it with a decorative layer; close the mold, pressurize and heat so that the above materials fuse and bond together to form an integral spare tire cover.

[0009] Preferably, in step 1, mica powder and white oil are pre-mixed, and then polypropylene, ethylene-octene copolymer, and antioxidant 1010 are added and stirred in a high-speed mixer for 5-10 minutes until uniform. Then, a twin-screw extruder is used at a temperature of 180-220° C. in conjunction with a hexagonal honeycomb mold to continuously extrude the honeycomb core blank, which is then water-cooled and cut into a preset size after being shaped.

[0010] Preferably, in step 2, the polypropylene raw material is extruded through an extruder, the extruder temperature is set to 190°C in zone 1, 210°C in zone 2, and 220°C in zone 3, and is extruded through a flat die head into a PP sheet with a thickness of 1.0-1.5 mm, and then cooled and shaped by a calendering roller, the roller temperature is 40-60°C, and the surface roughness Ra is ≤ 3.2 μm.

[0011] Preferably, in step three, the glass fiber reinforced PP fiberglass board is molded by adding PP and long glass fibers into a mold by a compression molding machine, and the mold is first preheated to a temperature of 80-100°C, and then melted to a temperature of 220-240°C, and then held at a pressure of 15-20 MPa for 30-60 seconds, and then water-cooled to cool the mold to 40-50°C before demolding.

[0012] Preferably, in step 4, the mold preheating temperature is 120-140°C, the mold pressurization pressure is 8-12 MPa, the heating temperature is 160-180°C, the holding time is 5-10 min, and the circulating water is cooled to below 60°C for demoulding.

[0013] Beneficial effects of the present invention: The present invention arranges PP board 1, glass fiber reinforced PP fiberglass board and PP board 2 on both sides of the PP honeycomb core. Since one layer of honeycomb structure is arranged with two layers of glass fiber reinforced PP fiberglass board, the compressive strength and shear strength are further improved, the energy absorption performance is more excellent, and the sound insulation and noise reduction function is also improved; four layers of PP boards are arranged, so the waterproof and moisture-proof performance is excellent.

[0014] The PP honeycomb core uses high molecular weight, high crystallinity polypropylene raw materials to improve the mechanical properties, heat resistance and chemical corrosion resistance of the PP honeycomb core; adding mica powder can improve the rigidity and heat resistance of the PP honeycomb board; adding antioxidant 1010 can improve the antioxidant performance of the PP honeycomb board and extend its service life; adding ethylene-octene copolymer as a toughening modifier can improve impact resistance and low-temperature toughness; odor adsorbent absorbs volatile organic compounds (VOCs) generated during the processing to improve environmental friendliness; white oil is used as a processing lubricant to promote the dispersion of mica powder and improve melt fluidity.

[0015] Glass fiber reinforced PP fiberboard uses long glass fibers to improve impact strength and flexural modulus. 10-30% of long glass fibers reinforced PP can achieve a tensile strength of 65-90 MPa, a flexural modulus of 4-6 GPa, and a heat deformation temperature of 145°C.

[0016] The present invention sequentially manufactures a PP honeycomb core, PP panels 1 and 2, and a glass-fiber-reinforced PP fiberglass sheet. These panels are then bonded together by heating and pressurizing them in a spare tire cover mold. This method eliminates the use of glue, is environmentally friendly, and eliminates odor. The glass-fiber-reinforced PP fiberglass sheet is formed using a compression molding machine. This results in isotropic fiber distribution and 30%-50% higher impact strength than injection molding. The all-PP substrate system is 100% recyclable, meeting environmental requirements for automotive materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 It is a structural schematic diagram of the present invention; 1-PP honeycomb core, 2-PP board one, 3-glass fiber reinforced PP fiberglass board, 4-PP board two. DETAILED DESCRIPTION

[0019] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to specific embodiments.

[0020] It should be noted that, unless otherwise defined, the technical or scientific terms used in the present invention should have the usual meanings understood by people with ordinary skills in the field to which the present invention belongs. The "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0021] like Figure 1 The present embodiment provides a spare tire cover for an automobile, comprising a PP honeycomb core 1 in the middle, PP boards 1 2 being arranged on both sides of the PP honeycomb core 1, a glass fiber reinforced PP fiberglass board 3 being arranged on the side of the PP board 1 2 away from the PP honeycomb core 1, a PP board 2 4 being arranged on the side of the glass fiber reinforced PP fiberglass board 3 away from the PP board 1 2, and a decorative layer being a non-woven fabric being arranged on the side of the PP board 2 4 away from the PP fiberglass honeycomb board 2; by arranging PP board 1, glass fiber reinforced PP fiberglass board 3 and PP board 2 4 on both sides of the PP honeycomb core 1, due to the arrangement of one layer of honeycomb structure and two layers of glass fiber reinforced PP fiberglass board 3, the compressive strength and shear strength are further improved, the energy absorption performance is more excellent, and the sound insulation and noise reduction function is also improved; four layers of PP boards are arranged, so that the waterproof and moisture-proof performance is excellent.

[0022] The PP honeycomb core 1 has a hexagonal honeycomb structure and is made of high-molecular-weight, high-crystallinity polypropylene. The raw materials for the PP honeycomb core 1 include: 50-110 parts by weight of polypropylene, 1-5 parts by weight of ethylene-octene copolymer, 10-20 parts by weight of mica powder, 0.1-2 parts by weight of antioxidant 1010, 0.2-3 parts by weight of an odor absorbent, and 1%-2% by weight of white oil based on the weight of the mica powder. The high-molecular-weight, high-crystallinity polypropylene raw material used in the PP honeycomb core 1 improves the mechanical properties, heat resistance, and chemical resistance of the PP honeycomb core. The addition of mica powder enhances the rigidity and heat resistance of the PP honeycomb panel; the addition of antioxidant 1010 improves the antioxidant properties of the PP honeycomb panel, extending its service life. The addition of ethylene-octene copolymer as a toughening modifier enhances impact resistance and low-temperature toughness. The odor absorbent absorbs volatile organic compounds (VOCs) generated during processing, improving environmental friendliness. The white oil acts as a processing lubricant, promoting the dispersion of the mica powder and improving melt flowability.

[0023] The glass fiber reinforced PP board 3 is composed of long glass fibers, each 20 mm long and containing 30% glass fibers. The board utilizes long glass fibers to enhance impact strength and flexural modulus. The 30% glass fiber reinforced PP achieves a tensile strength of 90 MPa, a flexural modulus of 6 GPa, and a heat distortion temperature of 145°C.

[0024] A production process for a spare tire cover for an automobile comprises the following steps: S1, preparing PP honeycomb core 1: preparing raw materials for PP honeycomb core 1, first pre-mixing mica powder and white oil, adding polypropylene, ethylene-octene copolymer, and antioxidant 1010, and stirring in a high-speed mixer for 10 minutes until uniform. Then, using a twin-screw extruder with a hexagonal honeycomb die at a temperature of 200°C to continuously extrude the honeycomb core blank, and then cutting into a preset size after water cooling and shaping; S2, preparing PP sheet 1 2 and PP sheet 2 4: extrude the polypropylene raw material through an extruder with the extruder temperature set at 190°C in zone 1, 210°C in zone 2, and 220°C in zone 3, extrude the PP sheet through a flat die head into a 1.0-1.5 mm thick PP sheet, and then cool and shape the sheet through a calender roller with a roller temperature of 60°C and a surface roughness of Ra ≤ 3.2 μm; S3, preparing a glass fiber reinforced PP glass fiber board 3: forming the glass fiber reinforced PP glass fiber board 3 by a compression molding machine, adding PP and long glass fibers into a compression molding mold of the compression molding machine, preheating the mold to 90°C, then melting the mold to 240°C, and then holding the mold at a pressure of 20 MPa for 30-60 seconds, and then water cooling the mold to 50°C before demolding; S4, pressing and molding: preheating the mold for pressing the tire cover, placing a decorative layer in the mold, then placing PP board 2 4, then laying glass fiber reinforced PP fiberglass board 3, then PP board 1 2, and finally placing PP honeycomb core 1 in the middle. PP board 1 2, glass fiber reinforced PP fiberglass board 3 and PP board 2 4 are laid on the other side in sequence, and finally covering with a decorative layer; The mold is closed and preheated first to 120°C, then pressurized and heated to allow the above materials to fuse and bond together to form an integral spare tire cover. The mold pressurization pressure is 10MPa, the heating temperature is 180°C, the pressure holding time is 10min, and the circulating water is cooled to below 60°C for demoulding.

[0025] The PP honeycomb core 1, PP sheet 1 2, PP sheet 2 4, and glass-fiber-reinforced PP fiberglass sheet 3 are sequentially manufactured. These sheets are then bonded together by heating and pressurizing them in a spare tire cover mold. This method eliminates the use of glue, is environmentally friendly, and eliminates odor. The glass-fiber-reinforced PP fiberglass sheet 3 is formed using a compression molding machine. This results in isotropic fiber distribution and higher impact strength than injection molding. The all-PP matrix system is 100% recyclable, meeting environmental requirements for automotive materials.

[0026] Those skilled in the art will understand that the discussion of any of the above embodiments is merely illustrative and is not intended to limit the scope of the present invention to these examples. Within the spirit and principles of the present invention, the technical features of the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and many other variations exist in the various aspects of the present invention described above, which are not provided in detail for the sake of clarity. Any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A spare tire cover for a car, characterized in that: The invention comprises a PP honeycomb core (1) in the middle, PP panels (2) are arranged on both sides of the PP honeycomb core (1), a glass fiber reinforced PP glass fiber board (3) is arranged on the side of the PP panel (2) away from the PP honeycomb core (1), a PP panel (4) is arranged on the side of the glass fiber reinforced PP glass fiber board (3) away from the PP panel (2), and a decorative layer is arranged on the side of the PP panel (4) away from the PP glass fiber honeycomb board (2); the PP honeycomb core (1) is a hexagonal honeycomb structure and adopts high molecular weight and high crystallinity polypropylene; the glass fiber of the glass fiber reinforced PP glass fiber board (3) is long glass fiber.

2. The automobile spare tire cover according to claim 1, characterized in that: The raw materials of the PP honeycomb core (1) include: 50-110 parts by weight of polypropylene, 1-5 parts by weight of ethylene-octene copolymer, 10-20 parts by weight of mica powder, 0.1-2 parts by weight of antioxidant 1010, 0.2-3 parts by weight of odor adsorbent, and 1%-2% of white oil based on the mass of the mica powder.

3. The automobile spare tire cover according to claim 2, characterized in that: The glass fiber reinforced PP glass fiber board (3) has a long glass fiber length of 10-25 mm.

4. The automobile spare tire cover according to claim 3, characterized in that: The glass fiber reinforced PP glass fiber board (3) has a long glass fiber content of 10-30%.

5. The production process of a spare tire cover for automobile according to claim 4, characterized in that: The following steps are involved: Step 1, preparing the PP honeycomb core (1): preparing the PP honeycomb core (1) raw materials, mixing the PP honeycomb core (1) raw materials in proportion, and extruding the raw materials through an extruder with a hexagonal honeycomb mold to obtain a honeycomb core blank; Step 2, preparing PP plate 1 (2) and PP plate 2 (4): obtaining PP plate 1 (2) and PP plate 2 (4) by extrusion molding using an extrusion molding machine; Step 3, preparing a glass fiber reinforced PP glass fiber board (3): forming the glass fiber reinforced PP glass fiber board (3) by a compression molding machine; Step 4, pressing and molding: preheating the mold for pressing the tire cover plate, placing a decorative layer in the mold, then placing PP board 2 (4), then laying glass fiber reinforced PP fiberglass board (3), then placing PP board 1 (2), and then placing the PP honeycomb core (1) in the middle position, and then laying PP board 1 (2), glass fiber reinforced PP fiberglass board (3) and PP board 2 (4) on the other side in sequence, and finally covering with a decorative layer; The molds are closed, and pressure and heating are applied to allow the above materials to fuse and bond together to form an integral spare tire cover.

6. The production process of a spare tire cover for automobile according to claim 5, characterized in that: In the first step, mica powder and white oil are pre-mixed, and then polypropylene, ethylene-octene copolymer, and antioxidant 1010 are added and stirred in a high-speed mixer for 5-10 minutes until uniform. Then, a twin-screw extruder is used at a temperature of 180-220° C. with a hexagonal honeycomb mold to continuously extrude the honeycomb core blank, which is then water-cooled and cut into a preset size after being shaped.

7. The production process of a spare tire cover for automobile according to claim 5, characterized in that: In the step 2, the polypropylene raw material is extruded through an extruder, the extruder temperature is set to 190°C in zone 1, 210°C in zone 2, and 220°C in zone 3, and a PP sheet with a thickness of 1.0-1.5 mm is extruded through a flat die head, and then cooled and shaped by a calendering roller, the roller temperature is 40-60°C, and the surface roughness Ra is ≤ 3.2 μm.

8. The production process of a spare tire cover for automobile according to claim 5, characterized in that: In the step 3, the glass fiber reinforced PP glass fiber board (3) is molded by a compression molding machine, and PP and long glass fibers are added to the mold. The mold is first preheated to a temperature of 80-100°C, and then melted to a temperature of 220-240°C. The pressure is then maintained at 15-20 MPa for 30-60 seconds, and the mold is then water-cooled to a temperature of 40-50°C before demoulding.

9. The production process of a spare tire cover for automobile according to claim 5, characterized in that: In the fourth step, the mold preheating temperature is 120-140° C., the mold pressurizing pressure is 8-12 MPa, the heating temperature is 160-180° C., the holding time is 5-10 min, and the circulating water is cooled to below 60° C. for demoulding.

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