CN109823002B - High-strength automobile ceiling with large-size skylight structure - Google Patents
High-strength automobile ceiling with large-size skylight structure Download PDFInfo
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Abstract
The invention belongs to the technical field of automobile parts, and particularly relates to a high-strength automobile ceiling with a large-size skylight structure, which is formed by arching a multi-layer composite board upwards from the central area of a board surface on the whole, wherein the multi-layer composite board sequentially comprises a first non-woven fabric layer, a soft sponge layer, a first PP glass fiber felt layer, a hard sponge layer, a second PP glass fiber felt layer and a second non-woven fabric layer from bottom to top, and the hard sponge layer is formed by directly foaming between the first PP glass fiber felt layer and the second PP glass fiber felt layer after mixing polyether polyol, water, a foaming stabilizer, a catalyst and isocyanate.
Description
Technical Field
The invention belongs to the technical field of automobile parts, and particularly relates to a high-strength automobile ceiling with a large-size skylight structure.
Background
The automobile with the skylight structure is beneficial to lighting, and the panoramic skylight can be opened to ventilate in clear weather. The automobile ceiling is attached to the ceiling of an automobile cab and is an important component of the whole automobile interior, so for an automobile with a skylight, a window with a corresponding size needs to be formed in the ceiling, the use of materials on the ceiling is reduced due to the existence of the window, the strength of the automobile ceiling is influenced, the ceiling is easy to deform, damage and fracture, the attractiveness and tidiness of assembly are influenced, and the situation that a window with a larger size (relative to the whole size of the ceiling) is formed in the automobile ceiling is less at present.
Disclosure of Invention
In order to solve the technical problems, the invention provides a high-strength automobile ceiling with a large-size skylight structure, the ceiling is formed by mould pressing and punching a multilayer composite board with a plane structure, the multilayer composite board sequentially comprises a first non-woven fabric layer, a soft sponge layer, a first PP glass fiber felt layer, a hard sponge layer, a second PP glass fiber felt layer and a second non-woven fabric layer from bottom to top,
the thickness of the first non-woven fabric layer is 0.8 to 1.0mm,
the thickness of the soft sponge layer is 2.7 to 3.2mm,
the thickness of the first glass fiber material layer is 1.3-1.6 mm,
the thickness of the hard sponge layer is 7.5-9 mm,
the thickness of the second glass fiber material layer is 1.3-1.6 mm,
the thickness of the second non-woven fabric layer is 0.8-1.0 mm,
the first non-woven fabric layer and the second non-woven fabric layer are both needle-punched non-woven fabrics, and the gram weight of the first non-woven fabric layer and the gram weight of the second non-woven fabric layer are 20-100 g/m2，
The first PP glass fiber felt layer and the second PP glass fiber felt layer are both made of PP fibers and glass fibers into felts in a needling mesh weaving mode, and the weight ratio of the PP fibers to the glass fibers is 6: 4-7: 3, the gram weight is 750-920 g/m2；
The preparation method of the multilayer composite board comprises the following steps,
(1) the first PP glass fiber felt layer and the second PP glass fiber felt layer are respectively and fixedly paved on the lower plate surface of the upper die plate and the upper plate surface of the lower die plate,
(2) at normal temperature (25 ℃, the same below), fully mixing polyether polyol, water, a foaming stabilizer and a catalyst to obtain a mixture 1, adding isocyanate into the mixture 1, immediately and uniformly spreading the mixture on the upper plate surface of the second PP fiberglass felt layer in the step (1) after fully mixing, sending the upper die plate and the lower die plate in the step (1) into a laminating machine together for foaming, after entering the laminating machine, arranging the upper die plate and the lower die plate in a vertically opposite manner and keeping the surface surfaces parallel, enabling the first PP fiberglass felt layer to be positioned right above the second PP fiberglass felt layer, controlling the distance between the first PP fiberglass felt layer and the second PP fiberglass felt layer to be 7.5-9 mm and keeping the distance between the upper die plate and the lower die plate constant all the time,
curing for 24 hours after entering a laminating machine (the foaming reaction is basically finished in the process), demoulding to obtain a three-layer composite board of a first PP glass fiber felt layer/a hard sponge layer/a second PP glass fiber felt layer,
wherein the mass ratio of polyether polyol, water, foaming stabilizer, catalyst and isocyanate is 70-100: 1.8-2.5: 1-1.5: 0.5-0.7: 35 to 45 of the total weight of the steel,
the amount of the mixed material evenly spread on the upper plate surface of the second PP glass fiber felt layer is 250-350 g/m2，
Because the first PP glass fiber felt layer and the second PP glass fiber felt layer both contain PP with a certain content, in the foaming process after entering the laminating machine, the layer surface of the PP glass fiber felt layer is contacted with the mixed material in the foaming state, so that the PP in the PP glass fiber felt layer is heated (by utilizing the heat emitted in the foaming chemical reaction) to be softened and then generates viscosity, and finally the PP is stably bonded with the hard sponge layer formed by foaming, and therefore, no additional binder is needed to be used between the layers;
(3) bonding the first non-woven fabric layer and the soft sponge layer by using a bonding agent to obtain a first non-woven fabric layer/soft sponge layer two-layer composite board;
(4) bonding the three-layer composite board of the first PP glass fiber felt layer/the hard sponge layer/the second PP glass fiber felt layer obtained in the step (2) with the two-layer composite board of the first nonwoven cloth layer/the soft sponge layer obtained in the step (3) through a bonding agent to obtain a five-layer composite board sequentially comprising a first nonwoven cloth layer, the soft sponge layer, the first PP glass fiber felt layer, the hard sponge layer and the second PP glass fiber felt layer;
(5) bonding the five-layer composite board obtained in the step (4) with a second non-woven fabric layer through a bonding agent to obtain a multi-layer composite board, cutting and trimming the multi-layer composite board to obtain the plane size required when the multi-layer composite board enters a subsequent forming die,
specifically, the multilayer composite board is a rectangular structure with the length of 1100-1185 mm and the width of 620-670 mm,
the operations of bonding by the adhesive in the steps (3), (4) and (5) are all the prior art means.
The forming method of the high-strength automobile ceiling with the large-size skylight structure comprises the following steps: baking the obtained multilayer composite board to be softened integrally, horizontally placing the multilayer composite board on a die cavity opening of a normal-temperature die cavity on a forming die base, closing a die, pressing the multilayer composite board into the die cavity so as to realize compression molding and skylight opening of the multilayer composite board, demolding to obtain a ceiling,
the ceiling after compression molding is formed by upward arching of the whole horizontal rectangular multilayer composite board surface, the top of the arching part is also a rectangular horizontal plane, four sides of the arched multilayer composite board are the bottom edges of the ceiling, a rectangular skylight penetrating through the upper and lower board surfaces of the multilayer composite board is arranged in the center area of the top of the arching part, the sides of the rectangular skylight corresponding to the top of the arching part are parallel to each other, the sides of the rectangular skylight corresponding to the bottom edges of the ceiling are parallel to each other,
on the ceiling, the lengths of the front edge, the rear edge, the left edge and the right edge of the top of the arch part are 515-530 mm, 840-860 mm and 840-860 mm respectively,
the front edge of the top of the arch part is connected with the front bottom edge of the ceiling, the rear edge of the top of the arch part is connected with the rear bottom edge of the ceiling, the left edge of the top of the arch part is connected with the left bottom edge of the ceiling, the right edge of the top of the arch part is connected with the right bottom edge of the ceiling through flat inclined planes which are respectively a front inclined plane, a rear inclined plane, a left inclined plane and a right inclined plane, and the boundary line between the adjacent inclined planes is a connecting line from the corner of the top of the arch part to the corner corresponding to the corner on the bottom edge of the ceiling,
the skylight is of a rectangular structure, the lengths of the front edge, the rear edge, the left edge and the right edge of the skylight are respectively 480-490 mm, 790-810 mm and 790-810 mm,
the molded ceiling is symmetrical left and right and front and back on the whole,
in the forming method, the baking time is 2 minutes, the baking temperature is 220 ℃, the pressure during die pressing is 1-3 MPa, the time for keeping the die pressing pressure is 30 seconds, and a corresponding circle of knife edge is arranged on a moving part opposite to the die base, so that when the die is closed (the moving part is combined with the die base), skylight opening is also realized.
Drawings
Figure 1 is a perspective view of a ceiling of the present invention,
figure 2 is a top view of the ceiling of the present invention in a laid-flat condition,
wherein, 1-inclined plane, 2-arch part top, 3-skylight.
Detailed Description
It should be noted that the words "front", "back", "left" and "right" used in the description of the present invention refer to the directions indicated in the drawings (fig. 2), and "inner" and "outer" refer to the directions toward and away from the geometric center of a particular component, respectively, which are merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present invention.
Example 1
Preparing a three-layer composite board of a first PP glass fiber felt layer/a hard sponge layer/a second PP glass fiber felt layer:
(1) a first PP glass fiber felt layer (gmt-PP glass fiber felt 4, 1.5mm thick of Jiangsu Shengdao composite material science and technology Co., Ltd.) and a second PP glass fiber felt layer (gmt-PP glass fiber felt 4, 1.5mm thick of Jiangsu Shengdao composite material science and technology Co., Ltd.) were respectively fixed and laid on the plate surface of the upper die plate (steel plate) and the plate surface of the lower die plate (steel plate),
(2) at normal temperature (25 ℃), fully mixing 82 parts by weight of polyether polyol (DEP-560D), 2 parts by weight of water, 1.2 parts by weight of foaming stabilizer (AK6689), 0.25 parts by weight of amine catalyst (A33) and 0.35 parts by weight of tin catalyst (T9) to obtain a mixed material 1, adding 38 parts by weight of isocyanate (Pasteur M50) into the mixed material 1, quickly mixing uniformly, immediately and uniformly coating on the outer plate surface of the second PP glass fiber felt layer in the step (1), wherein the coating weight is 270g/M2Sending the upper die plate and the lower die plate in the step (1) into a laminating machine together for foaming, after entering the laminating machine, enabling the upper die plate and the lower die plate to be arranged vertically and rightly and keeping the surfaces parallel, at the moment, enabling the second PP glass fiber felt layer to be located on the upper plate surface of the lower die plate, enabling the first PP glass fiber felt layer to be located on the lower plate surface of the upper die plate and simultaneously located right above the second PP glass fiber felt layer, and controlling the first PP glass fiber felt layer and the second PP glass fiber felt layerThe distance between the upper mold plate and the lower mold plate is 8.5mm and is kept constant all the time, after the mixture is stood in a laminating machine for 24 hours (in the time period, the mixture starts to foam on the upper plate surface of the second PP glass fiber felt layer and is finally adhered to the lower plate surface of the first PP glass fiber felt layer above the mixture, and the mixture is subjected to curing later), the three-layer composite plate of the first PP glass fiber felt layer/the hard sponge layer/the second PP glass fiber felt layer is obtained by demoulding.
Example 2
Preparing a multilayer composite board for preparing an automobile ceiling by die pressing:
(1) the first nonwoven layer (a 1mm thick needle-punched nonwoven having a grammage of 100 g/m) was bonded with a binder2) With a soft sponge layer (3mm thick, density 18 kg/m)3Elastic modulus 25MPa) surface to obtain a first non-woven fabric layer/soft sponge layer two-layer composite board;
(2) bonding the three-layer composite board of the first PP glass fiber felt layer/the hard sponge layer/the second PP glass fiber felt layer obtained in the embodiment 1 and the two-layer composite board of the first nonwoven cloth layer/the soft sponge layer obtained in the step (1) with the surface of the first PP glass fiber felt layer through the soft sponge layer by using a bonding agent to obtain a five-layer composite board sequentially comprising the first nonwoven cloth layer, the soft sponge layer, the first PP glass fiber felt layer, the hard sponge layer and the second PP glass fiber felt layer;
(3) bonding the second PP glass fiber felt layer and the second non-woven fabric layer (0.5mm thick needle-punched non-woven fabric with the gram weight of 20 g/m) on the five-layer composite board obtained in the step (2) by using a bonding agent2) And (3) adhering the surfaces to obtain a multilayer composite board, and cutting and trimming the multilayer composite board to obtain a rectangular structure with the length of 1150mm and the width of 650 mm.
Example 3
Directly carrying out compression molding on the three-layer composite plate of the first PP glass fiber felt layer/the hard sponge layer/the second PP glass fiber felt layer obtained in the example 1 and opening a skylight:
the three-layer composite board of the first PP glass fiber felt layer/the hard sponge layer/the second PP glass fiber felt layer obtained in the example 1 is cut and trimmed to obtain a rectangular structure with the length of 1150mm and the width of 650mm,
baking the whole three-layer composite board at 220 ℃ for 2 minutes to soften the three-layer composite board, then flatly placing the three-layer composite board on a die cavity opening of a normal-temperature die cavity on a forming die base, closing the die to enable a movable part of the die to be opposite to the three-layer composite board in a softened state to carry out forward downward die pressing to fully press the composite board into the die cavity and simultaneously complete skylight opening, keeping the die pressing pressure after the die is closed and pressed (the structure and the size of an inner cavity of the closed die are matched with an expected ceiling arch part) to be 2.5MPa, releasing the pressure to normal pressure (one standard atmospheric pressure) after the pressure is kept for 30 seconds, cooling, reopening the die, demoulding to obtain a ceiling,
the ceiling obtained by the design control of the mould is formed by integrally and upwardly arching the plate surface of the three-layer composite plate in the horizontal laying state, the top of the arching part is positioned at the center of the three-layer composite plate and is also a rectangular horizontal plane, four edges of the arched three-layer composite plate are all the bottom edge of the ceiling, a rectangular skylight penetrating through the upper plate surface and the lower plate surface of the three-layer composite plate is arranged in the central area of the top of the arching part, the edges of the rectangular skylight corresponding to the top of the arching part are parallel to each other, the edges of the rectangular skylight corresponding to the bottom edge of the ceiling are parallel to each other,
on the ceiling, the lengths of the front edge, the rear edge, the left edge and the right edge of the top of the arch part are respectively 520mm, 840mm and 840mm,
the front edge of the top of the arch part is connected with the front bottom edge of the ceiling, the rear edge of the top of the arch part is connected with the rear bottom edge of the ceiling, the left edge of the top of the arch part is connected with the left bottom edge of the ceiling, the right edge of the top of the arch part is connected with the right bottom edge of the ceiling through flat inclined planes which are respectively a front inclined plane, a rear inclined plane, a left inclined plane and a right inclined plane, and the boundary line between the adjacent inclined planes is a connecting line from the corner of the top of the arch part to the corner corresponding to the corner on the bottom edge of the ceiling,
the skylight is of a rectangular structure, the lengths of the front edge, the rear edge, the left edge and the right edge of the skylight are respectively 480mm, 800mm and 800mm,
the molded ceiling is symmetrical left and right and front and back on the whole.
Example 4
The multilayer composite panel obtained in example 2 was press-molded and skylight-opened in the same operation as in example 3.
Example 5
A flat glass fiber felt layer having the same texture as the first PP glass fiber felt layer and/or the second PP glass fiber felt layer in example 1 but having a thickness of 11.5mm (which is equivalent to the sum of the thicknesses of the three layers of the first PP glass fiber felt layer, the hard sponge layer and the second PP glass fiber felt layer in example 1) was cut and trimmed to obtain a rectangular plate having a length of 1150mm and a width of 650 mm.
Example 6
The rectangular plate obtained in example 5 was directly subjected to press molding and skylight opening in the same manner as in example 3.
The service performance of the planar multilayer composite board or the multilayer composite ceiling obtained in each of the above embodiments was tested:
the flat areas on the ceilings formed in examples 3, 4 and 5 were subjected to a small ball free fall impact test, and the specific impact positions were the midpoints of the lines between the midpoints of the left edge of the skylight and the top left edge of the arch and the midpoints of the right edge of the skylight and the top right edge of the arch (two points A, B in fig. 2):
storing a ceiling to be detected in a climate test chamber at-20 ℃ for 4 hours, then freely dropping and smashing small balls (with the weight of 500g, the ball radius of 12mm and uniform weight distribution) to a preset position at a high position of 1500mm, repeating the free dropping operation of the small balls until the ceiling cracks or fractures (in the test process, the bottoms of plates hit by the small balls are always fixed and tightly attached to a horizontal supporting surface and are supported by the supporting surface upwards), and counting the times of co-hitting;
the above-described hitting test was also performed on the same position on the planar multi-layer boards molded in examples 1 and 2,
the statistical results are shown in the following table:
from the above table it can be found that: the composite panel of example 1, in which two layers of glass fibers sandwich a layer of hard sponge, was molded into an open ceiling of the same dimensions, but the impact strength at the same location was significantly improved (as seen by comparing example 3 with example 1, and comparing example 4 with example 2), which was not present in a single-layer glass fiber panel of the same thickness (as seen by comparing example 6 with example 5).
Example 7
Only the "first PP glass fiber felt layer" and the "second PP glass fiber felt layer" in example 1 were replaced with "PVC glass fiber felt layers" of equal thickness (wherein the kind and content of the glass fiber, and the manufacturing process of the glass fiber felt layers refer to the glass fiber felt layers in example 1) to prepare a three-layer composite board of the first PVC glass fiber felt layer/the hard sponge layer/the second PVC glass fiber felt layer, the preparation process is the same as that in example 1;
the obtained three-layer composite plate of the first PVC glass fiber felt layer/the hard sponge layer/the second PVC glass fiber felt layer was cut and trimmed to obtain a rectangular structure having a length of 1150mm and a width of 650mm, and then compression molded into a ceiling having the same dimensions as those in example 3, and the operation of compression molding was performed in accordance with example 3.
The same small ball free falling body impact test is carried out on the ceiling after the compression molding, and the result is as follows: when the glass fiber felt layer is hit for 12 times, cracks firstly appear on the glass fiber felt layer positioned above the A point; when the glass fiber felt layer is hit 10 times, cracks appear on the glass fiber felt layer above the B point.
The corresponding position on the three-layer composite board plate of the first PVC glass fiber felt layer/the hard sponge layer/the second PVC glass fiber felt layer based on the compression molding is beaten the experiment again, and the result is: when the glass fiber felt layer is hit for 13 times, cracks firstly appear on the glass fiber felt layer positioned above the A point; when the glass fiber felt layer positioned above the B point is hit 12 times, cracks firstly appear on the glass fiber felt layer.
Example 8
Only the "first PP glass fiber felt layer" and the "second PP glass fiber felt layer" in example 1 were replaced with "PE glass fiber felt layers" having equal thickness (wherein the kind and content of the glass fiber, and the manufacturing process of the glass fiber felt layers refer to the glass fiber felt layers in example 1) to prepare a three-layer composite board of the first PE glass fiber felt layer/the hard sponge layer/the second PE glass fiber felt layer, which was prepared by the same process as in example 1;
the three-layer composite plate of the first PE glass fiber felt layer/the hard sponge layer/the second PE glass fiber felt layer was cut and trimmed to obtain a rectangular structure of 1150mm in length and 650mm in width, and then compression molded into a ceiling having the same dimensions as those in example 3, and the operation of compression molding was performed in accordance with example 3.
The same small ball free falling body impact test is carried out on the ceiling after the compression molding, and the result is as follows: when the glass fiber felt layer is hit for 17 times, cracks firstly appear on the glass fiber felt layer positioned above the A point; when the glass fiber felt layer is hit 15 times, cracks appear on the glass fiber felt layer above the B point.
The corresponding position on the three-layer composite board plate of the first PE glass fiber felt layer/the hard sponge layer/the second PE glass fiber felt layer based on the compression molding is beaten the experiment again, and the result is: when the glass fiber felt layer is hit for 16 times, cracks firstly appear on the glass fiber felt layer positioned above the A point; when the glass fiber felt layer is hit 15 times, cracks appear on the glass fiber felt layer above the B point.
It can be seen from examples 7 and 8 (including examples 5 and 6) that the impact strength of the composite board after the glass fiber felt layer is replaced is not improved after the press opening operation of the similar process. Therefore, the applicant believes that the lifting effect in example 3 (including example 4 based on the solution of example 3) may be caused by the synergistic effect exerted after the materials of the layers in the composite board are compounded together and arched by the mold pressing, so that the ceiling has better shock resistance and vibration resistance, and is not easy to break or fracture on the basis of opening a large-area skylight.
Claims (5)
1. A high-strength automobile ceiling with a large-size skylight structure is characterized in that: the ceiling is formed by integrally arching a multilayer composite board with a horizontal rectangular structure, the top of the arching part is also a rectangular horizontal plane, four sides of the arched multilayer composite board are all bottom edges of the ceiling, a rectangular skylight penetrating through the upper board surface and the lower board surface of the multilayer composite board is arranged in the central area of the top of the arching part, the sides of the rectangular skylight corresponding to the top of the arching part are parallel to each other, the sides of the rectangular skylight corresponding to the bottom edges of the ceiling are parallel to each other,
the multilayer composite board comprises a first non-woven fabric layer, a soft sponge layer, a first PP glass fiber felt layer, a hard sponge layer, a second PP glass fiber felt layer and a second non-woven fabric layer from bottom to top in sequence,
wherein the preparation method of the multilayer composite board comprises the following steps,
(1) respectively fixedly paving the first PP glass fiber felt layer and the second PP glass fiber felt layer on the lower plate surface of the upper die plate and the upper plate surface of the lower die plate;
(2) at normal temperature, fully mixing polyether polyol, water, a foaming stabilizer and a catalyst to obtain a mixture 1, adding isocyanate into the mixture 1, immediately and uniformly coating the obtained mixture on the upper plate surface of the second PP glass fiber felt layer in the step (1) after fully mixing, feeding the upper mold plate and the lower mold plate in the step (1) into a laminating machine together for foaming to obtain a three-layer composite plate of a first PP glass fiber felt layer/a hard sponge layer/a second PP glass fiber felt layer,
after entering a laminating machine, the upper die plate and the lower die plate are arranged in an up-and-down opposite mode and keep the surface parallel, so that the first PP glass fiber felt layer is positioned right above the second PP glass fiber felt layer, and the distance between the upper die plate and the lower die plate is always kept unchanged;
(3) bonding the first non-woven fabric layer and the soft sponge layer by using a bonding agent to obtain a first non-woven fabric layer/soft sponge layer two-layer composite board;
(4) bonding the three-layer composite board of the first PP glass fiber felt layer/the hard sponge layer/the second PP glass fiber felt layer obtained in the step (2) with the two-layer composite board of the first nonwoven cloth layer/the soft sponge layer obtained in the step (3) through a bonding agent to obtain a five-layer composite board sequentially comprising a first nonwoven cloth layer, the soft sponge layer, the first PP glass fiber felt layer, the hard sponge layer and the second PP glass fiber felt layer;
(5) bonding the five-layer composite board obtained in the step (4) with the second non-woven fabric layer through a bonding agent to obtain a multi-layer composite board, and cutting and trimming the multi-layer composite board;
the thickness of the first non-woven fabric layer is 0.8-1.0 mm,
the thickness of the soft sponge layer is 2.7-3.2 mm,
the thickness of the first glass fiber material layer is 1.5mm,
the thickness of the hard sponge layer is 7.5-9 mm,
the thickness of the second glass fiber material layer is 1.5mm,
the thickness of the second non-woven fabric layer is 0.8-1.0 mm;
feeding the upper die plate and the lower die plate in the step (1) into a laminating machine together for foaming to obtain a three-layer composite plate of a first PP fiberglass mat layer/a hard sponge layer/a second PP fiberglass mat layer, wherein the size of the three-layer composite plate is 1150mm in length and 650mm in width;
on the ceiling, the lengths of the front edge, the rear edge, the left edge and the right edge of the top of the arch part are respectively 520mm, 840mm and 840mm,
the front edge of the top of the arch part is connected with the front bottom edge of the ceiling, the rear edge of the top of the arch part is connected with the rear bottom edge of the ceiling, the left edge of the top of the arch part is connected with the left bottom edge of the ceiling, the right edge of the top of the arch part is connected with the right bottom edge of the ceiling through flat inclined planes which are respectively a front inclined plane, a rear inclined plane, a left inclined plane and a right inclined plane, and the boundary line between the adjacent inclined planes is a connecting line from the corner of the top of the arch part to the corner corresponding to the corner on the bottom edge of the ceiling,
the skylight is of a rectangular structure, and the lengths of the front edge, the rear edge, the left edge and the right edge of the skylight are respectively 480mm, 800mm and 800 mm;
the molded ceiling is symmetrical left and right and front and back on the whole.
2. A high-strength automotive headliner having a large-size sunroof structure according to claim 1, wherein: in the step (2), the mass ratio of polyether polyol, water, foaming stabilizer, catalyst and isocyanate is 70-100: 1.8-2.5: 1-1.5: 0.5-0.7: 35-45.
3. A high-strength automotive headliner having a large-size sunroof structure according to claim 1, wherein: in the step (2), the coating amount of the mixed materials uniformly coated on the upper plate surface of the second PP glass fiber felt layer is 250-350 g/m2。
4. A method of manufacturing a high-strength automobile roof having a large-sized sunroof structure according to any one of claims 1 to 3, wherein:
the preparation method comprises the steps of integrally baking the multilayer composite board until the multilayer composite board is softened, horizontally placing the multilayer composite board at a die cavity opening of a normal-temperature die cavity on a base of a forming die, closing the die, pressing the multilayer composite board into the die cavity, thus realizing compression molding and skylight opening of the multilayer composite board, and demolding to obtain the ceiling.
5. The method of manufacturing a high-strength automobile roof having a large-sized sunroof structure according to claim 4, wherein: the baking time is 2 minutes, the baking temperature is 220 ℃, the pressure during die pressing is 1-3 MPa, and the time for keeping the die pressing pressure is 30 seconds.
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| EP2666672A1 (en) * | 2012-05-25 | 2013-11-27 | International Automotive Components Group GmbH | Interior lining for a motor vehicle, which comprises a roof liner and a stiffening frame, and method for the production of same |
| CN105082668A (en) * | 2015-09-11 | 2015-11-25 | 芜湖正海汽车内饰件有限公司 | Special dry-method PU substrate used for vehicle skylight edged ceiling and production process thereof |
| CN207190439U (en) * | 2017-09-07 | 2018-04-06 | 温州市环球汽车衬垫有限公司 | Novel vehicle clerestory window arm-tie assembly |
| CN108859362A (en) * | 2018-05-25 | 2018-11-23 | 南通大学 | A kind of broadband multilayer sound absorption acoustic material and preparation method thereof |
| CN108908803A (en) * | 2018-07-30 | 2018-11-30 | 长春超维科技产业有限责任公司 | A kind of processing mold and its processing method with skylight roof of the vehicle |
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| CN109823002A (en) | 2019-05-31 |
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