CN116589787B - Foamed polypropylene board and preparation method thereof, wheel cover lining plate and preparation method thereof, and vehicle - Google Patents
Foamed polypropylene board and preparation method thereof, wheel cover lining plate and preparation method thereof, and vehicle Download PDFInfo
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- CN116589787B CN116589787B CN202310302161.5A CN202310302161A CN116589787B CN 116589787 B CN116589787 B CN 116589787B CN 202310302161 A CN202310302161 A CN 202310302161A CN 116589787 B CN116589787 B CN 116589787B
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- 239000004743 Polypropylene Substances 0.000 title claims abstract description 94
- -1 polypropylene Polymers 0.000 title claims abstract description 93
- 229920001155 polypropylene Polymers 0.000 title claims abstract description 93
- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- 239000002994 raw material Substances 0.000 claims abstract description 57
- 239000004088 foaming agent Substances 0.000 claims abstract description 21
- 239000002667 nucleating agent Substances 0.000 claims abstract description 21
- 239000002245 particle Substances 0.000 claims abstract description 16
- 238000005187 foaming Methods 0.000 claims abstract description 15
- 238000004519 manufacturing process Methods 0.000 claims abstract description 10
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 30
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 28
- 238000000034 method Methods 0.000 claims description 26
- 238000000465 moulding Methods 0.000 claims description 16
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims description 15
- 235000017557 sodium bicarbonate Nutrition 0.000 claims description 15
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 14
- 239000012968 metallocene catalyst Substances 0.000 claims description 14
- 238000009966 trimming Methods 0.000 claims description 12
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 238000004080 punching Methods 0.000 claims description 3
- 238000009740 moulding (composite fabrication) Methods 0.000 claims description 2
- 238000002156 mixing Methods 0.000 abstract description 12
- 239000003054 catalyst Substances 0.000 abstract description 6
- 238000011161 development Methods 0.000 abstract description 5
- 230000009467 reduction Effects 0.000 abstract description 4
- 238000007731 hot pressing Methods 0.000 abstract description 2
- 239000003562 lightweight material Substances 0.000 abstract description 2
- 239000000203 mixture Substances 0.000 abstract description 2
- 238000004904 shortening Methods 0.000 abstract description 2
- 238000007723 die pressing method Methods 0.000 description 20
- 230000008569 process Effects 0.000 description 16
- 230000001276 controlling effect Effects 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 10
- 238000005520 cutting process Methods 0.000 description 10
- 238000001125 extrusion Methods 0.000 description 9
- 239000004745 nonwoven fabric Substances 0.000 description 9
- 238000003825 pressing Methods 0.000 description 9
- 238000007493 shaping process Methods 0.000 description 9
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
- 229920000742 Cotton Polymers 0.000 description 6
- 238000009413 insulation Methods 0.000 description 6
- 101000969770 Homo sapiens Myelin protein zero-like protein 2 Proteins 0.000 description 5
- 102100021272 Myelin protein zero-like protein 2 Human genes 0.000 description 5
- 239000002131 composite material Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 230000006911 nucleation Effects 0.000 description 5
- 238000010899 nucleation Methods 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 239000002952 polymeric resin Substances 0.000 description 4
- 229920003002 synthetic resin Polymers 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/06—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
- C08J9/08—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent developing carbon dioxide
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D25/00—Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
- B62D25/08—Front or rear portions
- B62D25/16—Mud-guards or wings; Wheel cover panels
- B62D25/161—Mud-guards made of non-conventional material, e.g. rubber, plastics
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0066—Use of inorganic compounding ingredients
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/02—CO2-releasing, e.g. NaHCO3 and citric acid
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/10—Homopolymers or copolymers of propene
- C08J2323/12—Polypropene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Medicinal Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The application relates to the technical field of vehicle exterior trim, in particular to a foaming polypropylene plate and a preparation method thereof, a wheel cover lining plate and a preparation method thereof, and a vehicle. The preparation method of the foaming polypropylene plate comprises the following steps: fully mixing raw materials, and then adding the mixture into a single-screw extruder, wherein the raw materials comprise polypropylene particles, a foaming agent, a catalyst, a nucleating agent and white oil; controlling the length-diameter ratio of the single screw extruder to be larger than or equal to 20, controlling the screw rotating speed to be 10r/min-30r/min, controlling the die head pressure to be 6Mpa-12Mpa, controlling the temperature of the T-shaped die head to be 180-230 ℃, controlling the gap of the T-shaped die head to be 0.5-5 mm, controlling the length of the T-shaped die head to be 0.5-2 m, and extruding the raw materials by the single screw extruder to obtain the foamed polypropylene board. The application adopts special lightweight materials to manufacture the wheel cover lining plate of the automobile by hot pressing, not only can ensure the strength use requirement of the wheel cover lining plate, but also can realize the great reduction of the density, the great reduction of the weight of the wheel cover lining plate and the shortening of the development period.
Description
Technical Field
The application relates to the technical field of vehicle exterior trim, in particular to a foaming polypropylene plate and a preparation method thereof, a wheel cover lining plate and a preparation method thereof, and a vehicle.
Background
The automobile wheel cover lining plate is used as a vehicle standard, is arranged on the outer sides of the four wheel hub sheet metals, plays a role in shielding the wheel hub sheet metals and the wire harness, and can also have the function of blocking mud and resisting broken stone impact. The traditional automobile wheel cover lining plate is generally manufactured by adopting PP injection molding or EVA, the mold is complex, the development and design period is long, the development cost is high, and the weight of manufactured parts is high.
The invention patent with publication number CN 105818500A discloses an automobile wheel cover composite material, which adopts a non-woven fabric, sound absorbing cotton, EVA and non-woven fabric four-layer material structure to manufacture a wheel cover lining plate, wherein the EVA layer is formed by compounding three layers of EVA with different thicknesses and different densities, the densities are above 1.2g/m 3, and the thicknesses are 0.8mm-1.4mm, but the parts of the scheme are very heavy and do not meet the requirements of the lightweight development of automobiles.
Disclosure of Invention
The application aims to provide a wheel cover plate of an automobile, so as to realize the purpose of light weight of parts.
In order to achieve the above purpose, the technical scheme adopted by the application is as follows:
In a first aspect, an embodiment of the present application provides a method for preparing a foamed polypropylene sheet, the method comprising the steps of:
Fully mixing raw materials, and then adding the mixture into a single-screw extruder, wherein the raw materials comprise polypropylene particles, a foaming agent, a catalyst, a nucleating agent and white oil;
Controlling the length-diameter ratio of the single screw extruder to be larger than or equal to 20, controlling the screw rotating speed to be 10r/min-30r/min, controlling the die head pressure to be 6Mpa-12Mpa, controlling the temperature of the T-shaped die head to be 180-230 ℃, controlling the gap of the T-shaped die head to be 0.5-5 mm, controlling the length of the T-shaped die head to be 0.5-2 m, and extruding the raw materials by the single screw extruder to obtain the foamed polypropylene board.
Further, the foaming agent is sodium bicarbonate foaming agent, the catalyst is metallocene catalyst, and the nucleating agent is calcium carbonate nucleating agent.
Further, the raw materials comprise the following components in parts by weight: 100 parts of polypropylene particles, 5-10 parts of sodium bicarbonate foaming agent, 2-3 parts of metallocene catalyst, 1-3 parts of calcium carbonate nucleating agent and 3-5 parts of white oil;
further, the screw speed of the single screw extruder is controlled to be 15r/min-25r/min, the die head pressure is reduced to be 8Mpa-10Mpa, the temperature of the T-shaped die head is 200-210 ℃, the gap of the T-shaped die head is 1.5mm-3mm, and the length of the T-shaped die head is 1m-1.5m.
In a second aspect, an embodiment of the present application provides a foamed polypropylene sheet, which is prepared by the preparation method of the foamed polypropylene sheet provided in the first aspect of the present application.
In a third aspect, an embodiment of the present application provides a method for manufacturing a wheel cover liner, including:
the foaming polypropylene board is prepared by the preparation method of the foaming polypropylene board provided by the first aspect of the application;
And (3) placing the foamed polypropylene board into a baking oven for baking, placing into a die for compression punching and forming, and trimming to obtain the wheel cover lining board.
Further, the baking temperature is 190-220 ℃, and the baking time is 30-50S.
Further, the molding pressure is 200T-250T, and the molding time is 30S-60S.
In a fourth aspect, the embodiment of the application provides a wheel cover lining board, which is prepared by the preparation method of the foaming polypropylene board provided by the third aspect of the application, and the density of the wheel cover lining board is (0.5-0.8) g/cm 3.
In a fifth aspect, an embodiment of the present application provides a vehicle comprising the wheel cover lining provided in the fourth aspect of the present application.
The application has the beneficial effects that: the application adopts special lightweight materials to manufacture the wheel cover lining plate of the automobile by hot pressing, not only can ensure the strength use requirement of the wheel cover lining plate, but also can realize the great reduction of the density, the great reduction of the weight of the wheel cover lining plate and the shortening of the development period.
Drawings
Fig. 1 shows a process flow diagram of a preparation method of a foamed polypropylene board provided by an embodiment of the application;
FIG. 2 shows a microstructure of a foamed polypropylene sheet provided by an embodiment of the application;
FIG. 3 shows a process flow diagram of a method for manufacturing a wheel casing liner provided by an embodiment of the application;
fig. 4 shows a schematic structural view of the automobile wheel cover composite material provided in comparative example 5 of the present application.
Wherein:
1. A hopper; 2. a screw barrel; 3. a T-die; 4. foaming polypropylene plate; 5. a roller; 6. a slicing knife; 7. foaming polypropylene plate; 8. an oven; 9. a mold; 10. a wheel cover lining plate;
1', a first nonwoven layer; 2', a sound-absorbing cotton layer; a 3' polymer resin composite sheet layer; 4' a second nonwoven layer.
Detailed Description
Further advantages and effects of the present invention will become readily apparent to those skilled in the art from the disclosure herein, by referring to the accompanying drawings and the preferred embodiments. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be understood that the preferred embodiments are presented by way of illustration only and not by way of limitation.
It should be noted that the illustrations provided in the following embodiments merely illustrate the basic concept of the present invention by way of illustration, and only the components related to the present invention are shown in the drawings and are not drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of the components in actual implementation may be arbitrarily changed, and the layout of the components may be more complicated.
Hereinafter, preferred embodiments of the present invention will be described in detail.
Embodiment 1: foaming polypropylene board and preparation method thereof
The foaming polypropylene sheet material of the embodiment 1 of the invention adopts polypropylene particles, foaming agent, nucleating agent and catalyst to be fully mixed and then extruded into the sheet material through a T-shaped die of a single screw extruder. As shown in fig. 1, the preparation method of the foamed polypropylene board comprises the following steps:
(1) The raw materials are fully mixed and then added into a single screw extruder, wherein the raw materials comprise polypropylene particles, a foaming agent, a catalyst, a nucleating agent and white oil.
(2) Controlling the length-diameter ratio of the single screw extruder to be larger than or equal to 20, controlling the screw rotating speed to be 10r/min-30r/min, controlling the die head pressure to be 6Mpa-12Mpa, controlling the temperature of the T-shaped die head to be 180-230 ℃, controlling the gap of the T-shaped die head to be 0.5-5 mm, controlling the length of the T-shaped die head to be 0.5-2 m, and extruding the raw materials by the single screw extruder to obtain the foamed polypropylene board.
As shown in figure 1, raw materials are prepared according to a proportion and then are added into a hopper 1 of a single screw extruder, the rotating speed of the screw is regulated, the raw materials are melted in a screw feed cylinder 2 and fully mixed and advance towards a T-shaped die head 3, the pressure of the melted raw materials is reduced, a large amount of gas is quickly released by a foaming agent when the raw materials are extruded to form a plate, a large amount of small bubbles are formed under the action of a nucleating agent, the process is completed when the melted raw materials exit the T-shaped die head 3, the raw materials are extruded to form a foamed polypropylene plate 4 with a certain width after exiting the T-shaped die head 3, the foamed polypropylene plate with uniform thickness is formed after being pressed and shaped by a roller 5, and the foamed polypropylene plate 7 with the required length and width is manufactured after being cut by a subsequent slicing knife 6.
Among them, sodium bicarbonate is preferable, and when the sodium bicarbonate foaming agent reaches a T-die of a single screw extruder, it rapidly releases a large amount of carbon dioxide gas due to the pressure drop, and the carbon dioxide gas is in a supercritical state under the conditions of a pressure of 7.4MPa or more and a temperature of 31 ℃ or more, and the carbon dioxide gas in this state is excellent in diffusivity and solubility in a polymer.
Wherein the catalyst is preferably a metallocene catalyst, the nucleating agent is preferably a calcium carbonate nucleating agent, and in the embodiment, the raw materials comprise the following components in parts by weight: 100 parts of polypropylene particles, 5-10 parts of sodium bicarbonate foaming agent, 2-3 parts of metallocene catalyst, 1-3 parts of calcium carbonate nucleating agent and 3-5 parts of white oil.
The main key control parameters of the single screw extruder are length-diameter ratio, screw rotation speed, pressure drop and T-type die temperature. In the embodiment, the length-diameter ratio parameter is more than or equal to 20, the screw rotating speed is in the range of 10r/min to 30r/min, and preferably 15r/min to 25r/min, so as to ensure the full melt mixing of the raw materials; the control range of the die head pressure drop is 6Mpa-12Mpa, preferably 8Mpa-10Mpa, the die head pressure drop can influence the bubble nucleation speed and the bubble quantity, the larger the die head pressure drop is, the more the bubble nucleation quantity is, but the larger the die head pressure drop is, the appearance problems of insufficient plate strength, broken skin and the like can be caused; the temperature control range of the T-shaped die is 180-230 ℃, preferably 200-210 ℃, the temperature is too low, the foam rate of the plate is low, the foaming multiplying power is low, the temperature is too high, the number of foam holes is too large, and the defect of Kong Popi is overcome; the adjusting range of the gap of the T-shaped die is 0.5 mm-5 mm, preferably 1.5mm-3mm, the gap of the die determines the thickness of the foamed polypropylene sheet, and the length of the T-shaped die is 0.5 m-2 m, preferably 1m-1.5m.
As shown in fig. 2, the inside of the foamed polypropylene board obtained in the present embodiment generates a large amount of closed cells uniformly distributed in the inert gas profile by the foaming agent, so that the foamed polypropylene board has the characteristics of good sound insulation performance and light weight.
Embodiment 2: wheel cover lining plate and preparation method thereof
In the embodiment, the foamed polypropylene board is put into a baking oven for baking, then is put into a die for compression punching and forming, and finally is finished and trimmed to obtain the wheel cover lining board.
Specifically, as shown in fig. 3, the produced foamed polypropylene sheet 7 is put into a baking oven 8 for baking under the baking conditions of 190-220 ℃ and 30-50S, then the baked foamed polypropylene sheet 7 is put into a die 9 for die-pressing and die-cutting forming, the die-pressing pressure in the process is 200-250T, the forming time is 30-60S, the wheel cover lining part is obtained after being taken out, and the final wheel cover lining 10 is obtained after finishing and trimming.
Wherein, the foaming polypropylene board 7 is prepared by the preparation method of the foaming polypropylene board provided in the embodiment 1.
The application will be described in detail with reference to preferred embodiments.
Example 1
A wheel cover lining plate is prepared by the following steps.
Step 1, fully mixing raw materials, and adding the raw materials into a single-screw extruder, wherein the raw materials comprise 100 parts by weight of polypropylene particles, 5 parts by weight of sodium bicarbonate foaming agent, 2 parts by weight of metallocene catalyst, 1 part by weight of calcium carbonate nucleating agent and 3 parts by weight of white oil;
and 2, extruding the raw materials through a T-shaped die head of a single screw extruder to obtain the foamed polypropylene sheet, wherein in the extrusion process, the length-diameter ratio of the single screw extruder is controlled to be 20, the screw rotating speed is controlled to be 10r/min, the die head pressure is reduced to be 12mpa, the temperature of the T-shaped die head is 180 ℃, the gap of the T-shaped die head is 0.5mm, and the length of the T-shaped die head is 0.5m.
And 3, pressing and shaping the foamed polypropylene board by a roller until the thickness is uniform, putting the foamed polypropylene board into a baking oven for baking at 190 ℃ for 50S, putting the baked foamed polypropylene board into a die for die-pressing and die-cutting molding, wherein the die-pressing pressure is 200T, the molding time is 60S, taking out to obtain a wheel cover lining plate part, and finishing and trimming to obtain the final wheel cover lining plate.
Example 2
A wheel cover lining plate is prepared by the following steps.
Step 1, fully mixing raw materials, and adding the raw materials into a single-screw extruder, wherein the raw materials comprise 100 parts by weight of polypropylene particles, 10 parts by weight of sodium bicarbonate foaming agent, 3 parts by weight of metallocene catalyst, 3 parts by weight of calcium carbonate nucleating agent and 5 parts by weight of white oil;
And 2, extruding the raw materials through a T-shaped die head of a single screw extruder to obtain the foamed polypropylene sheet, wherein in the extrusion process, the length-diameter ratio of the single screw extruder is controlled to be 20, the screw rotating speed is controlled to be 30r/min, the die head pressure is reduced to 6mpa, the temperature of the T-shaped die head is 230 ℃, the gap of the T-shaped die head is 5mm, and the length of the T-shaped die head is 2m.
And 3, pressing and shaping the foamed polypropylene board by a roller until the thickness is uniform, putting the foamed polypropylene board into a baking oven for baking at 220 ℃ for 30S, putting the baked foamed polypropylene board into a die for die-pressing and die-cutting forming, wherein the die-pressing pressure is 250T, the forming time is 30S, taking out to obtain a wheel cover lining plate part, and finishing and trimming to obtain the final wheel cover lining plate.
Example 3
A wheel cover lining plate is prepared by the following steps.
Step 1, fully mixing raw materials, and adding the raw materials into a single-screw extruder, wherein the raw materials comprise 100 parts by weight of polypropylene particles, 7 parts by weight of sodium bicarbonate foaming agent, 2 parts by weight of metallocene catalyst, 2 parts by weight of calcium carbonate nucleating agent and 4 parts by weight of white oil;
And 2, extruding the raw materials through a T-shaped die head of a single screw extruder to obtain the foamed polypropylene sheet, wherein in the extrusion process, the length-diameter ratio of the single screw extruder is controlled to be 25, the screw rotating speed is controlled to be 15r/min, the die head pressure is reduced to 10mpa, the temperature of the T-shaped die head is 200 ℃, the gap of the T-shaped die head is 1.5mm, and the length of the T-shaped die head is 1m.
And 3, pressing and shaping the foamed polypropylene board by a roller until the thickness is uniform, putting the foamed polypropylene board into a baking oven for baking at 200 ℃ for 40S, putting the baked foamed polypropylene board into a die for die-pressing and die-cutting forming, wherein the die-pressing pressure is 230T, the forming time is 40S, taking out to obtain a wheel cover lining plate part, and finishing and trimming to obtain the final wheel cover lining plate.
Example 4
A wheel cover lining plate is prepared by the following steps.
Step 1, fully mixing raw materials, and adding the raw materials into a single-screw extruder, wherein the raw materials comprise 100 parts by weight of polypropylene particles, 8 parts by weight of sodium bicarbonate foaming agent, 2.5 parts by weight of metallocene catalyst, 2.5 parts by weight of calcium carbonate nucleating agent and 3 parts by weight of white oil;
And 2, extruding the raw materials through a T-shaped die head of a single screw extruder to obtain the foamed polypropylene sheet, wherein in the extrusion process, the length-diameter ratio of the single screw extruder is controlled to be 25, the screw rotating speed is controlled to be 25r/min, the die head pressure is reduced to 8mpa, the temperature of the T-shaped die head is 210 ℃, the gap of the T-shaped die head is 3mm, and the length of the T-shaped die head is 1.5m.
And 3, pressing and shaping the foamed polypropylene board by a roller until the thickness is uniform, putting the foamed polypropylene board into a baking oven for baking at the temperature of 210 ℃ for 35S, putting the baked foamed polypropylene board into a die for die-pressing and die-cutting forming, wherein the die-pressing pressure is 240T, the forming time is 45S, taking out to obtain a wheel cover lining plate part, and finishing and trimming to obtain the final wheel cover lining plate.
Example 5
A wheel cover lining plate is prepared by the following steps.
Step 1, fully mixing raw materials, and adding the raw materials into a single-screw extruder, wherein the raw materials comprise 100 parts by weight of polypropylene particles, 8 parts by weight of sodium bicarbonate foaming agent, 2.5 parts by weight of metallocene catalyst, 2 parts by weight of calcium carbonate nucleating agent and 4 parts by weight of white oil;
And 2, extruding the raw materials through a T-shaped die head of a single screw extruder to obtain the foamed polypropylene sheet, wherein in the extrusion process, the length-diameter ratio of the single screw extruder is controlled to be 25, the screw rotating speed is controlled to be 20r/min, the die head pressure is reduced to 9mpa, the temperature of the T-shaped die head is 205 ℃, the gap of the T-shaped die head is 2.5mm, and the length of the T-shaped die head is 1.5m.
And 3, pressing and shaping the foamed polypropylene board by a roller until the thickness is uniform, putting the foamed polypropylene board into a baking oven for baking at 205 ℃ for 40S, putting the baked foamed polypropylene board into a die for die-pressing and die-cutting molding, wherein the die-pressing pressure is 225T, the molding time is 45S, taking out to obtain a wheel cover lining plate part, and finishing and trimming to obtain the final wheel cover lining plate.
Comparative example 1
A wheel cover lining plate is prepared by the following steps.
Step 1, fully mixing raw materials, and adding the raw materials into a single-screw extruder, wherein the raw materials comprise 100 parts by weight of polypropylene particles, 8 parts by weight of sodium bicarbonate foaming agent, 2.5 parts by weight of metallocene catalyst, 2 parts by weight of calcium carbonate nucleating agent and 4 parts by weight of white oil;
And 2, extruding the raw materials through a T-shaped die head of a single screw extruder to obtain the foamed polypropylene sheet, wherein in the extrusion process, the length-diameter ratio of the single screw extruder is controlled to be 25, the screw rotating speed is controlled to be 20r/min, the die head pressure is reduced to 15mpa, the temperature of the T-shaped die head is 205 ℃, the gap of the T-shaped die head is 2.5mm, and the length of the T-shaped die head is 1.5m.
And 3, pressing and shaping the foamed polypropylene board by a roller until the thickness is uniform, putting the foamed polypropylene board into a baking oven for baking at 205 ℃ for 40S, putting the baked foamed polypropylene board into a die for die-pressing and die-cutting molding, wherein the die-pressing pressure is 225T, the molding time is 45S, taking out to obtain a wheel cover lining plate part, and finishing and trimming to obtain the final wheel cover lining plate.
Comparative example 2
A wheel cover lining plate is prepared by the following steps.
Step 1, fully mixing raw materials, and adding the raw materials into a single-screw extruder, wherein the raw materials comprise 100 parts by weight of polypropylene particles, 8 parts by weight of sodium bicarbonate foaming agent, 2.5 parts by weight of metallocene catalyst, 2 parts by weight of calcium carbonate nucleating agent and 4 parts by weight of white oil;
And 2, extruding the raw materials through a T-shaped die head of a single screw extruder to obtain the foamed polypropylene sheet, wherein in the extrusion process, the length-diameter ratio of the single screw extruder is controlled to be 25, the screw rotating speed is controlled to be 20r/min, the die head pressure is reduced to 9mpa, the temperature of the T-shaped die head is 280 ℃, the gap of the T-shaped die head is 2.5mm, and the length of the T-shaped die head is 1.5m.
And 3, pressing and shaping the foamed polypropylene board by a roller until the thickness is uniform, putting the foamed polypropylene board into a baking oven for baking at 205 ℃ for 40S, putting the baked foamed polypropylene board into a die for die-pressing and die-cutting molding, wherein the die-pressing pressure is 225T, the molding time is 45S, taking out to obtain a wheel cover lining plate part, and finishing and trimming to obtain the final wheel cover lining plate.
Comparative example 3
A wheel cover lining plate is prepared by the following steps.
Step 1, fully mixing raw materials, and adding the raw materials into a single-screw extruder, wherein the raw materials comprise 100 parts by weight of polypropylene particles, 8 parts by weight of sodium bicarbonate foaming agent, 2.5 parts by weight of metallocene catalyst, 2 parts by weight of calcium carbonate nucleating agent and 4 parts by weight of white oil;
And 2, extruding the raw materials through a T-shaped die head of a single screw extruder to obtain the foamed polypropylene sheet, wherein in the extrusion process, the length-diameter ratio of the single screw extruder is controlled to be 25, the screw rotating speed is controlled to be 20r/min, the die head pressure is reduced to be 2mpa, the temperature of the T-shaped die head is 205 ℃, the gap of the T-shaped die head is 2.5mm, and the length of the T-shaped die head is 1.5m.
And 3, pressing and shaping the foamed polypropylene board by a roller until the thickness is uniform, putting the foamed polypropylene board into a baking oven for baking at 205 ℃ for 40S, putting the baked foamed polypropylene board into a die for die-pressing and die-cutting molding, wherein the die-pressing pressure is 225T, the molding time is 45S, taking out to obtain a wheel cover lining plate part, and finishing and trimming to obtain the final wheel cover lining plate.
Comparative example 4
A wheel cover lining plate is prepared by the following steps.
Step 1, fully mixing raw materials, and adding the raw materials into a single-screw extruder, wherein the raw materials comprise 100 parts by weight of polypropylene particles, 8 parts by weight of sodium bicarbonate foaming agent, 2.5 parts by weight of metallocene catalyst, 2 parts by weight of calcium carbonate nucleating agent and 4 parts by weight of white oil;
And 2, extruding the raw materials through a T-shaped die head of a single screw extruder to obtain the foamed polypropylene sheet, wherein in the extrusion process, the length-diameter ratio of the single screw extruder is controlled to be 25, the screw rotating speed is controlled to be 20r/min, the die head pressure is reduced to 9mpa, the temperature of the T-shaped die head is 140 ℃, the gap of the T-shaped die head is 2.5mm, and the length of the T-shaped die head is 1.5m.
And 3, pressing and shaping the foamed polypropylene board by a roller until the thickness is uniform, putting the foamed polypropylene board into a baking oven for baking at 205 ℃ for 40S, putting the baked foamed polypropylene board into a die for die-pressing and die-cutting molding, wherein the die-pressing pressure is 225T, the molding time is 45S, taking out to obtain a wheel cover lining plate part, and finishing and trimming to obtain the final wheel cover lining plate.
Comparative example 5
An automobile wheel cover composite material comprises a first non-woven fabric layer 1', a sound absorbing cotton layer 2', a high polymer resin combined sheet layer 3 'and a second non-woven fabric layer 4' which are sequentially overlapped from top to bottom; the polymer resin combined sheet layer 3 is formed by overlapping three layers of EVA1 sheets with the thickness of 1.2-1.3 mm, the density of 1.5-1.6 g/mm 3, EVA2 sheets with the thickness of 0.8-0.9 mm, the density of 1.3-1.4 g/mm 3 and EVA3 sheets with the thickness of 1.3-1.4 mm and the density of 1.7-1.8 g/mm 3; the first nonwoven layer 1' is PET nonwoven fabric, and the weight is 20g/m 2; the sound-absorbing cotton layer 2 is fiber cotton with the fiber fineness of 0.3-30 denier and the weight of 400g/m 2; the second non-woven fabric layer 4' is PET non-woven fabric, and the weight is 40g/m 2; the sheets of the first non-woven fabric layer 1', the sound absorbing cotton layer 2', the polymer resin combined sheet layer 3 'and the second non-woven fabric layer 4' are heated to the proper temperature of 90-180 ℃ respectively, pressurized for thermal synthesis, and cut to obtain the automobile wheel cover composite material.
The products of examples 1 to 5 and comparative examples 1 to 5 were subjected to performance tests, respectively, to obtain the density and weight of the products for evaluating the lightweight index of the products, to obtain the sound average transmission loss coefficient of the products for evaluating the sound insulation performance of the products, and to observe whether the products are broken for evaluating the foaming quality, and the respective indexes are described in table 1.
TABLE 1
As can be seen from table 1, the wheel casing liners obtained by the preparation methods of examples 1 to 5 have lower densities, remarkable product weight reduction effects, larger average sound transmission loss coefficients, and superior sound insulation effects, as compared with comparative example 5.
As can be seen from the performance indexes of comparative examples 1 and 2, the die pressure drop affects the bubble nucleation rate and the bubble number, the larger the pressure drop, the more the bubble nucleation number, but the larger the die pressure drop, the appearance problems such as skin breakage occur, and the like, resulting in insufficient plate strength, and the too small die pressure drop results in low bubble nucleation number, low bubble number, and poor density and sound insulation performance.
As can be seen from the performance indexes of comparative examples 3 and 4, the too low temperature of the T-die leads to low bubble content, low expansion ratio, and poor density and sound insulation performance of the product; too high a temperature of the T-die can result in too large cells, a small number of cells and defects of Kong Popi affecting the structural strength of the product.
The embodiment of the application also provides a vehicle, and the vehicle is provided with the wheel casing lining plate provided by the embodiment of the application, namely the wheel casing lining plate is prepared by the method provided by each embodiment. The vehicle can achieve the technical effect of light weight, and has certain sound insulation performance. The vehicle of the present embodiment may further include other necessary components or structures such as a chassis, a vehicle body, an engine, a transmission mechanism, etc., and the corresponding arrangement positions and connection relationships may refer to vehicles in the prior art, and the connection relationships, operation and operation principles of the structures that are not described are known to those skilled in the art, and will not be described in detail herein.
It is understood that the vehicles in the embodiments of the present application may be all vehicles with mobility, including vehicles with autopilot or intelligent driving, such as manned vehicles (sedans, buses, wagons, etc.), cargo-carrying vehicles (regular trucks, vans, swing trailers, closed trucks, tank trucks, flatbed trucks, container trucks, dump trucks, special structure trucks), special vehicles (logistics distribution vehicles, patrol vehicles, cranes, excavators, bulldozers, forklift trucks, road rollers, loaders, off-road engineering vehicles, armored engineering vehicles, sewage treatment vehicles), recreational vehicles (recreational vehicles, amusement park autopilots, balance vehicles, etc.), rescue vehicles (e.g., fire fighters, ambulances, electric power repair vehicles, engineering emergency vehicles, etc.), and the like.
It should be noted that references in the specification to "one implementation," "an embodiment," "an example embodiment," "some embodiments," etc., indicate that the embodiment may include a particular feature, structure, or characteristic, but every embodiment may not necessarily include the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Furthermore, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to effect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.
It should be noted that in this document, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application.
Claims (8)
1. The preparation method of the foaming polypropylene plate is characterized by comprising the following steps:
The raw materials are fully mixed and then added into a single screw extruder, and the raw materials comprise the following components in parts by weight: 100 parts of polypropylene particles, 5-10 parts of sodium bicarbonate foaming agent, 2-3 parts of metallocene catalyst, 1-3 parts of calcium carbonate nucleating agent and 3-5 parts of white oil;
Controlling the length-diameter ratio of the single screw extruder to be larger than or equal to 20, controlling the screw rotating speed to be 10r/min-30r/min, controlling the die head pressure to be 6Mpa-12Mpa, controlling the temperature of the T-shaped die head to be 180-230 ℃, controlling the gap of the T-shaped die head to be 0.5mm-5mm, controlling the length of the T-shaped die head to be 0.5m-2m, and extruding the raw materials by the single screw extruder to obtain the foamed polypropylene board.
2. The method for producing a foamed polypropylene sheet according to claim 1, wherein the screw speed of the single screw extruder is controlled to 15r/min to 25r/min, the die head pressure is reduced to 8Mpa to 10Mpa, the temperature of the T-die is 200 ℃ to 210 ℃, the gap of the T-die is 1.5mm to 3mm, and the length of the T-die head is 1m to 1.5m.
3. A foamed polypropylene sheet, characterized by being produced by the production method of the foamed polypropylene sheet as defined in claim 1 or 2.
4. A method of making a wheel cover liner comprising:
A foamed polypropylene sheet produced by the production method of a foamed polypropylene sheet as defined in claim 1 or 2;
And (3) placing the foamed polypropylene board into a baking oven for baking, placing into a die for compression punching and forming, and trimming to obtain the wheel cover lining board.
5. The method for producing a wheel well lining according to claim 4, wherein the baking temperature is 190 ℃ to 220 ℃ and the baking time is 30S to 50S.
6. The method of producing a wheel well lining according to claim 4, wherein the molding pressure is 200T to 250T and the molding time is 30S to 60S.
7. A wheel cover liner prepared by the method of preparing a wheel cover liner as claimed in any one of claims 4 to 6, wherein the wheel cover liner has a density of (0.5 to 0.8) g/cm 3.
8. A vehicle comprising the wheel cover liner of claim 7.
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