JP3176406B2 - Automotive panel material and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a panel material for an automobile formed by using waste magnetic tape.

[0002]

2. Description of the Related Art A panel material formed by adding a binder such as phenol resin to glass wool is generally lined with the back of the hood of an automobile.

Further, a panel material formed by adding a binder to glass fiber is also used for a lining material of an automobile ceiling, a core material of a door, an engine cover behind a hood, a partition plate between a hood and a room, and the like. I have.

[0004]

The above-mentioned automotive panel materials have excellent heat insulating properties, sound absorbing properties, flame retardancy, heat resistance, antistatic properties, electromagnetic wave shielding properties and workability. In addition, it is desired to be lightweight and inexpensive. However, conventional panel materials cannot satisfy all of these characteristics.

An object of the present invention is to provide a lightweight and inexpensive automotive panel material having excellent heat insulating properties, sound absorption properties, flame retardancy, heat resistance, antistatic properties, electromagnetic wave shielding properties and workability. Is what you do.

[0006]

SUMMARY OF THE INVENTION The present inventors have previously described a method for treating a waste magnetic tape and a building material board using the same (Japanese Patent Application No. 3-174742 / Japanese Patent No. 2578697).
Was carried out application on issue).

As a result of further studies on such techniques, the present inventors have found that, according to the above-mentioned processing method, excellent heat insulating properties, sound absorbing properties, flame retardancy, heat resistance, antistatic properties, and electromagnetic wave shielding. It has sex and workability, moreover it is possible to provide an inexpensive molding material lightweight, studying on efficient usage of its, and completed the present invention.

That is , the gist of the present invention is that a waste magnetic tape is cut or pulverized to an appropriate size and the temperature exceeds 100 ° C.
After heat treatment at 00 ° C or less to shrink it into a curl,
This binder was added, the beauty waste magnetic tapes Oyo automotive panels, characterized in that it is obtained by press-molding is cut or crushed to a suitable size, heat treatment at 200 ° C. or less exceed 100 ° C. After shrinking in a curl shape, the low temperature reactive primary binder is
5 to 30 parts by weight based on 0 parts by weight and 3 to 3 parts by weight of the high temperature reactive secondary binder based on 100 parts by weight of the waste magnetic tape.
A method for manufacturing a panel material for automobiles, characterized by adding 70 parts by weight, temporarily forming with the primary binder, and then pressing with the secondary binder.

[0009] As the waste magnetic tape, such as a video tape, a cassette tape of defective products leaving the plant tape and the tape of spent products (waste) can be utilized. The heat treatment of the waste magnetic tape is performed at a temperature of more than 100 ° C. and 200 ° C. or less, more preferably 140 to 170 ° C. When the temperature is lower than 100 ° C., no curling occurs.
If the temperature is higher than 200 ° C., it is deteriorated by air oxidation and cannot be used. The magnetic tape is cut or crushed to a length of 1 to 50 mm, preferably 3 to 10 mm. If the waste magnetic tape is crushed to less than 1 mm, the crushing becomes too costly and powdery, so that the structure does not have voids inside. If it is larger than 50 mm, the surface state after molding becomes rough and the strength is inferior, so that there is no practicality.

[0010] the primary binder is a low temperature reaction of the binder, examples thereof may be mentioned starch down glue, polyvinyl alcohol, gum arabic glue, etc. casein glue. These primary binders can be used in an amount of 5 to 30 parts by weight, preferably 10 to 20 parts by weight, based on the waste magnetic tape. The secondary binder is a high-temperature reactive binder, and examples thereof include latex, liquid rubber, polyurethane adhesive, epoxy adhesive, melamine resin, phenol resin, and urea resin. These secondary binders are added to the waste magnetic tape in an amount of 3 to 70 parts by weight, preferably 10 to 50 parts by weight, and are uniformly mixed.

In manufacturing the automobile panel material of the present invention, ferrite, carbon black, graphite, carbon fiber or conductive metal powder having electromagnetic wave characteristics is added to the waste magnetic tape depending on the required performance. Alternatively, a conductive metal fiber or a 12 to 100 mesh conductive metal gauze can be mixed inside, for example, in a sandwich shape.

As the ferrite, there are a spinel type, a garnet type, and a magnet plumbite type.
These are used alone or as a mixture in an amount of 10 to 150 parts by weight, preferably 30 to 70 parts by weight, based on the waste magnetic tape. Examples of the carbon black include channel black, furnace black, acetylene black,
Thermal black, lamp black and the like can be used, and these are added to the waste magnetic tape in an amount of 1 to 100 parts by weight, preferably 10 to 30 parts by weight. As the conductive metal powder, iron, stainless steel, copper, aluminum or the like can be used alone or in combination with ferrite or carbon black. These are used in an amount of 10 to 150 parts by weight, preferably 30 to 150 parts by weight, based on the waste magnetic tape. ７０70 parts by weight are added. As the conductive metal fiber or the conductive wire mesh, a fiber such as iron, stainless steel, copper, or aluminum, or a 12 to 100 mesh wire mesh knitted with these fibers can be used. 1 to 100 parts by weight, preferably 10 to 30 parts by weight are mixed.

In producing the panel material of the present invention, a flame-retardant material, a filler and the like can be further added according to the required performance. As the flame retardant, antimony trioxide, chlorinated paraffin, molybdenum oxide or the like can be preferably used in an amount of 3 to 10 parts by weight based on the waste magnetic tape.

According to the present invention , the waste magnetic tape is cut or crushed into a suitable size. For cutting or pulverizing, for example, an impact type pulverizer having a general fixed blade and a rotary blade shown in FIG. 1 can be used. In the figure, 1 is a hopper, 2 is a rotary blade, 3 is a fixed blade, 4 is a screen,
5 is a crusher main body. The waste magnetic tape is rolled from the hopper 1 and thrown in, cut by the rotary blade 2 and the fixed blade 3,
Crushed. The size of the crushed material (or cut material) can be arbitrarily selected by setting the crushing conditions and the size of the mesh of the screen 4. For example, the pulverized material used in the experiment is pulverized in the following size distribution. 5mm or more 1% 3 to 5mm 40% 3mm or less 59%

When the above-mentioned pulverized material is heated under predetermined conditions, it becomes a pulverized material containing small pieces that have been curled as shown in FIGS. The primary and secondary binders as described above are added to the pulverized material thus obtained, and, if necessary, are subjected to provisional molding and then pressure-molded to an appropriate density to thereby produce the automobile of the present invention. Panel material is obtained.

In the present invention, when the above binder is added to a curled shrinkable piece obtained by heat-treating a pulverized waste magnetic tape, the curled shrinkable piece is formed inside the curled shrinkable piece. A panel material is obtained in which air is enclosed and voids are present inside. Because the above panel material has voids inside, it is excellent in heat insulation, sound absorption, flame retardancy and heat resistance, and further uses waste magnetic tape as a raw material,
It is excellent in antistatic performance and electromagnetic wave shielding performance, and is lightweight and inexpensive.

The panel material of the present invention is subjected to a predetermined process such as press forming or punching to thereby provide a lining material for the back of the bonnet, a lining material for the indoor ceiling, a core material for a door, an engine cover, a partition plate. It can be used as automobile parts. For example, panel materials lined on the back side of the bonnet include heat insulation, sound absorption, flame retardancy, heat resistance,
It is required to have excellent antistatic performance, electromagnetic wave absorption performance, and the like. According to the automotive panel material of the present invention, all of these requirements can be satisfied. In addition, the above-mentioned performance is required for the lining material of the indoor ceiling, the engine cover, the partition between the bonnet and the room with a certain strength, but according to the automotive panel material of the present invention, such performance is required. Can respond to various requests. Hereinafter, the present invention will be described in detail with reference to the drawings by way of examples, but the present invention is not limited thereto.

As shown in (a) of Example 1 3 was ground to the following scale flake 5mm using a pulverizer 7 showing the waste magnetic tape 6 (b).
The obtained pulverized product is heated by a heater 8 as shown in FIG.
While being heated to 50 ± 5 ° C., it was conveyed by the belt conveyor 13 and contracted into a curled shape to obtain a curled shape 9. (D)
As shown by the formula, 20 parts by weight of starch paste as a primary binder and 15 parts by weight of novolak-type phenol as a secondary binder were added to 100 parts by weight of the curled product,
The mixture is mixed using a Henschel mixer 10, and the mixture 12 is continuously supplied to a belt conveyor 13 by a feeder 11 as shown in FIG. 1E, and the supplied mixture 12 is cut off while being vibrated by a vibrator 14. Board 1
5 to perform predetermined forming by a predetermined amount, then perform temporary forming by a press conveyor 16 at a pressure of 5 kg / cm ² , and cut by a cutter 17 into a predetermined size to form a temporary forming as shown in (f). After obtaining material 18, it was cured until the primary binder was cured.

The obtained temporary molding material 18 is subjected to press molding using a press molding machine (not shown) so as to have a thickness of 5 mm under conditions of a press temperature of 150 ° C. and a press time of 15 minutes. By performing a predetermined process such as a punching process, a lining panel material lined on the back side of the hood of the automobile was produced. The density of the obtained lining panel material was 413 kg / m ³ .

[0020] The physical properties and performance of the automotive lining panel material obtained I'm in Example 1 are shown in Table 1. This panel is JIS
It passed the flame retardant class 3 in the combustion test based on A-1321.

[0021]

[Table 1] The panel material of Example 1 has better physical properties and performance than a conventional bonnet lining material using glass wool.

Examples 2 to 11 In the same manner as in Example 1, the waste magnetic tape was pulverized by a pulverizer 7 shown in FIG. 3 into flakes of 5 mm or less, and the obtained pulverized material was heated by a heater 8 at 150 ° ± 5 ° C. The mixture was conveyed while being heated to form a curl-shaped product 9 to obtain a curled product 9. This curl shaped object 1
Change the type and blending amount of the binder to 00 parts by weight,
Each of the panels was uniformly mixed using a Henschel mixer 10 and then pressed and heated by a hot press and molded. Table 2 shows the physical properties of the produced panels.

[0023]

[Table 2] * 1 Liquid modified polybutadiene: Idemitsu Chemical Co., Ltd., MC-50 * 2 Liquid phenol: Sumitomo Durres Co., Ltd., phenolic resin, liquid resin PR-53660 * 3 Powdered phenol: Sumitomo Durres Co., Ltd., phenolic resin, powder Body resin PR-311 * 4 Sound level meter characteristics From the table, it can be seen that by changing the kind and blending amount of the binder, practically necessary physical properties can be arbitrarily obtained.

Examples 12 to 16 In order to improve the electromagnetic wave characteristics, various ferrites, carbon black, carbon fibers, graphite or conductive wire mesh were added, and the panel was formed in the same manner as in Example 1 to produce a panel. Table 3 shows the electromagnetic wave characteristics.

[0025]

[Table 3]

FIG. 4 is a graph showing the electromagnetic wave shielding characteristics of the panel material in which the conductive mesh of 14 mesh shown in Example 16 is mixed in a sandwich shape. The performance almost equivalent to the electromagnetic wave shielding characteristic of the 2 mm thick aluminum plate shown in FIG. 5 is apparent.

In the above-mentioned Examples 1 to 16, the case where the automobile panel material of the present invention is a lining panel material lined on the back side of the bonnet has been described. Is not limited to this, but by changing the press forming conditions, processing methods such as punching, etc., the interior lining material of the car interior ceiling, the core material of the door, the engine cover, the partition plate between the hood and the room Can be used as

[0028]

According to the present invention, it is possible to provide a lightweight and inexpensive automotive panel material having excellent heat insulating properties, sound absorbing properties, flame retardancy, heat resistance and workability.

[Brief description of the drawings]

FIG. 1 is a sectional elevation view of a main part showing an example of a crusher used in the present invention.

FIG. 2 is an exemplary view of a curled shrinkable piece of a waste magnetic tape formed in the present invention.

FIG. 3 is a process chart showing a manufacturing process of a panel material in Examples 1 and 12 to 16 .

FIG. 4 is a graph showing the radio wave shielding characteristics of the panel material of Example 16.

FIG. 5 is a graph showing a radio wave shielding characteristic of an aluminum plate.

────────────────────────────────────────────────── ─── Continuing from the front page Examiner Koichi Nakano (56) References JP-A-62-204906 (JP, A) JP-A-48-8877 (JP, A) (58) Fields investigated (Int. Cl. ⁷⁾ , DB name) B29B 17/00-17/02 C08J 11/00-11/28 B62D 29/04

Claims (2)

(57) [Claims] 1. A waste magnetic tape is cut into an appropriate size.
Or pulverized and heat-treated at over 100 ° C and below 200 ° C.
After shrinking it into a curl, add a binder to it.
It is characterized by being obtained by pressure molding
Automotive panel materials. 2. A waste magnetic tape is cut into an appropriate size.
Or pulverized and heat-treated at over 100 ° C and below 200 ° C.
After contracting in a curled shape, the primary binder is reactive at low temperatures.
5 to 30 parts by weight with respect to 100 parts by weight of waste magnetic tape
Part and high temperature reactive secondary binder
3 to 70 parts by weight with respect to 00 parts by weight,
After temporary molding with a binder,
Manufacturing method of automotive panel material characterized by pressing
Law.