JPH079447A - Panel material for car and production thereof - Google Patents

Abstract

PURPOSE:To inexpensively obtain a lightweight panel material excellent in heat resistance, sound-insulating properties, fire retardancy, antistatic properties, electromagnetic shield properties and processability by adding a binder to the shrunk pieces of a waste magnetic tape obtained by cutting or grinding the waste magnetic tape into a proper size and heating the obtained tape pieces and molding the resulting mixture under pressure. CONSTITUTION:A waste magnetic tape 6 such as a video tape or a cassette tape is cut and ground by a grinder 7. The obtained ground matter is fed by a belt conveyor 13 while heated by a heater 8 to obtain thermally shrunk and curled matter 9. A primary low temp. reactive binder and a secondary high temp. reactive binder are added to the curled matter 9 and the resulting mixture 12 is mixed using a Henschel mixer 10. This mixture 12 is continuously supplied to the belt conveyor 13 by a feeder 11 to be cut by a plate 15 while vibrated by a vibrator 14 and preformed by a press conveyor 16 and cut by a cutter 17 to obtain a preformed material 18 which is, in turn, aged to be molded by a press molding machine.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Generally, a panel material formed by adding a binder such as phenol resin to glass wool is lined on the inside of the hood of an automobile.

Further, panel materials formed by adding a binder to glass fiber are also used as lining materials for automobile ceilings, door core materials, engine covers on the back of the hood, partition plates between the hood and the interior, and the like. There is.

[0004]

The above automotive panel material has excellent heat insulating properties, sound absorbing properties, flame retardancy, heat resistance, antistatic properties, electromagnetic wave shielding properties and processability. In addition, it is desired to be lightweight and inexpensive.

However, conventional panel materials cannot satisfy all of these characteristics.

Therefore, the present invention provides excellent heat insulation, sound absorption,
It is intended to provide a lightweight and inexpensive automobile panel material having flame retardancy, heat resistance, antistatic property, electromagnetic wave shielding property and workability.

[0007]

The present inventors have previously filed an application for a method of treating waste magnetic tape and a building material board (Japanese Patent Application No. 3-174742) using the method.

As a result of further research on such a technique, the present inventors have found that the above-mentioned treatment method has excellent heat insulating property, sound absorbing property, flame retardancy, heat resistance, antistatic property, electromagnetic wave shielding property. It has been found that it is possible to provide a molding material which is light in weight and inexpensive, and which has moldability and processability.

Therefore, the present inventors have made extensive studies on how to effectively use such a molding material, and completed the present invention.

That is, the gist of the present invention is a video tape,
It is obtained by cutting or crushing a waste magnetic tape such as a cassette tape into an appropriate size and heat-treating it to obtain a shrinkable piece of the waste magnetic tape, which is added with a binder and pressure-molded. Automobile panel materials and waste magnetic tapes such as video tapes and cassette tapes are cut or crushed to an appropriate size, heat-treated, added with a primary binder and a secondary binder, and temporarily molded with the primary binder. It is a method for producing a panel material for automobiles, which is characterized by performing pressure molding with the following binder.

As the waste magnetic tape, defective tapes such as video tapes and cassette tapes produced from the factory and used products (waste) can be used.

The waste magnetic tape has a length of 1 to 50 mm,
It is preferably cut or crushed to 3 to 10 mm. If the waste magnetic tape is crushed to less than 1 mm, the crushing will be too expensive and it will be powdery, so it does not have a structure having voids inside. If it is larger than 50 mm, the surface condition after molding becomes rough and the strength is poor, so that it is not practical.
The heat treatment is preferably 100 to 200 ° C.,
More preferably, it is performed at a temperature of 140 to 170 ° C. 1
Curling does not occur at less than 00 ° C. At temperatures higher than 200 ° C, it cannot be used because it deteriorates due to air oxidation.

The primary binder is a low temperature reactive binder, and examples thereof include starch, paste, polyvinyl alcohol, arabic rubber paste, casein paste and the like. 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, examples of which include latex,
Examples thereof include liquid rubber, polyurethane adhesive, epoxy adhesive, melamine resin, phenol resin, urea resin and the like. 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 mixed uniformly.

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

The above-mentioned ferrite includes spinel type, garnet type and magnet plumbite type.
These may be added alone or in a mixture, and added to the waste magnetic tape in an amount of 10 to 150 parts by weight, preferably 30 to 70 parts by weight. The carbon blacks include channel black, furnace black, acetylene black,
Thermal black, lamp black and the like can be used, and these are added in an amount of 1 to 100 parts by weight, preferably 10 to 30 parts by weight, based on the waste magnetic tape. As the conductive metal powder, iron, stainless steel, copper, aluminum or the like can be used alone or mixed with ferrite or carbon black, and these are 10 to 150 parts by weight, preferably 30 parts by weight with respect to the waste magnetic tape. ~ 70 parts by weight are added. As the conductive metal fiber or the conductive wire mesh, fibers of iron, stainless steel, copper, aluminum or the like, or a 12-100 mesh wire mesh woven with these fibers can be used. 1 to 100 parts by weight, preferably 10 to 30 parts by weight are mixed.

In manufacturing the panel material of the present invention, a flame retardant material, a filler or the like may be further added depending on the required performance. As the flame-retardant material, antimony trioxide, chlorinated paraffin, molybdenum oxide and 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, waste magnetic tapes such as video tapes and cassette tapes are cut or crushed to an appropriate size. For cutting or crushing, for example, an impact crusher 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, and 5 is a crusher main body. Waste magnetic tape is rolled in from hopper 1
It is cut by the rotary blade 2 and the fixed blade 3 and crushed. The size of the crushed product (or cut product) can be arbitrarily selected by setting the crushing condition and the size of the mesh of the screen 4. For example, the pulverized material used in the experiment is pulverized with the following size distribution. 5 mm or more 1% 3-5 mm 40% 3 mm or less 59%

When the above-mentioned pulverized product is heated under predetermined conditions, it becomes a pulverized product containing small pieces curled in a curl shape as shown by I and II in FIG.

A primary binder and a secondary binder as described above are added to the pulverized product thus obtained, and in some cases preliminary molding is carried out, followed by pressure molding to give an appropriate density. The automobile panel material of the invention is obtained.

In the present invention, when the binder is added to the curled contraction piece obtained by heat-treating the pulverized product of the waste magnetic tape and pressure molding is performed, the curled contraction piece is placed inside the curled contraction piece. Air is contained, and a panel material having voids inside is obtained.

Since the panel material has voids inside,
It is excellent in heat insulation, sound absorption, flame retardancy, and heat resistance, and since it uses waste magnetic tape as a raw material, it has excellent antistatic performance and electromagnetic wave absorption performance, and is lightweight and inexpensive.

The panel material of the present invention is subjected to a predetermined process such as press molding or punching process to obtain a lining material for the back of the bonnet, a lining material for the interior ceiling, a core material for the door, an engine cover, a partition plate. It can be used as an automobile part.

For example, the panel material lined on the back side of the bonnet is required to have excellent heat insulating properties, sound absorbing properties, flame retardancy, heat resistance, antistatic properties, electromagnetic wave absorbing properties, and the like. However, the automotive panel material of the present invention can satisfy all of these requirements.

Further, the lining material for the interior ceiling, the engine cover, the partition plate between the bonnet and the interior are required to have a certain strength and the above-mentioned performance. However, according to the panel material for an automobile of the present invention. For example, we can meet such demands.

Hereinafter, the present invention will be described in more detail by way of examples with reference to the drawings, but the present invention is not limited thereto.

Example 1 As shown in FIG. 3 (a), the waste magnetic tape 6 was crushed into pieces having a size of 5 mm or less by using the crusher 7 shown in (b).
As shown in (c), the obtained pulverized material is heated by the heater 8 to 15
While being heated to 0 ± 5 ° C., it was conveyed by a belt conveyor 13 to be contracted and curled to obtain a curled product 9. As shown in (d), to 100 parts by weight of this curled product, 20 parts by weight of starch paste as a primary binder and 15 parts by weight of novolac-type phenol as a secondary binder were added and mixed using a Henschel mixer 10. As shown in e), the mixture 12 is continuously supplied onto the belt conveyor 13 by the feeder 11, and the scraping plate 15 is vibrated by the vibrator 14 to the supplied mixture 12.
By using a press conveyor 16 to perform temporary molding at a pressure of 5 kg / cm ² and a cutter 17 to cut into a predetermined size, thereby forming a temporary molding material as shown in (f). After 18 was obtained, curing was performed until the primary binder was hardened.

Using the press molding machine (not shown), the temporary molding material 18 thus obtained is press-molded to a thickness of 5 mm under the conditions of a pressing temperature of 150 ° C. and a pressing time of 15 minutes, By subjecting to predetermined processing such as punching processing, an lining panel material to be lined on the back side of the hood of an automobile was produced. The density of the obtained lining panel material was 413 kg / m ³ .

Table 1 shows the physical properties and performance of the automobile lining panel material obtained in Example 1. This panel is J
Passed Class 3 flame retardancy in a combustion test based on ISA-1321.

[0029]

[Table 1]

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

Examples 2 to 11 Waste magnetic tape was crushed into scales of 5 mm or less by the crusher 7 shown in FIG. 3 as in Example 1, and the obtained crushed product was heated by a heater 8 at 150 ° ± 5 ° C. It was conveyed while being heated to a curl shape to obtain a curled shape product 9. This curled object 1
Change the type and amount of binder to 100 parts by weight,
Table 2 shows the physical properties of the panel produced by uniformly mixing each using the Henschel mixer 10 and then pressurizing and heating with a hot press for molding.

[0032]

[Table 2] * 1 Liquid modified polybutadiene: Idemitsu Chemical Co., Ltd.
MC-50 * 2 Liquid phenol: Sumitomo Durres Co., Ltd., phenol resin, liquid resin PR-53660 * 3 Powder phenol: Sumitomo Durres Co., Ltd., phenol resin, powder resin PR-311 * 4 Noise TC characteristics table It can be seen that, by changing the type and blending amount of the binder, the practically required physical properties can be arbitrarily obtained.

Examples 12 to 16 In order to improve electromagnetic wave characteristics, various ferrites, carbon black, carbon fibers, graphite, conductive wire mesh, etc. were added and molded in the same manner as in Example 1 to prepare panels. The electromagnetic wave characteristics are shown in Table 3.

[0034]

[Table 3]

Further, FIG. 4 shows a graph of 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. It is clear that the performance is almost the same as the electromagnetic wave shielding characteristics of the 2 mm thick aluminum plate shown in FIG.

In the above Examples 1 to 16, the case where the automobile panel material of the present invention is a lining panel material which is lined on the back side of the bonnet has been described. The use of the automobile panel material of the present invention Is not limited to this, but by changing the press molding conditions and processing methods such as punching, it can be used as a lining material for indoor ceilings, core material for doors, engine covers, partition plates for bonnet and interior Can be used.

[0037]

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

[Brief description of drawings]

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

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

FIG. 3 is a process drawing showing the manufacturing process of the panel material in the example.

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 shield characteristic of an aluminum plate.

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[Procedure amendment]

[Submission date] February 5, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction content]

The above-mentioned primary binder is a low temperature reactive binder, and examples thereof include starch paste, polyvinyl alcohol, arabic rubber paste, casein paste and the like. 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, urea resin and the like. 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 mixed uniformly.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0021

[Correction method] Change

[Correction content]

Since the panel material has voids inside,
It has excellent heat insulation, sound absorption, flame retardancy, and heat resistance. Furthermore, since it uses waste magnetic tape as a raw material, it has excellent antistatic performance and electromagnetic wave shielding performance, and is lightweight and inexpensive.

[Procedure 3]

[Document name to be amended] Statement

[Name of item to be corrected] 0032

[Correction method] Change

[Correction content]

[0032]

[Table 2] * 1 Liquid modified polybutadiene: Idemitsu Chemical Co., Ltd., MC-50 * 2 Liquid phenol: Sumitomo Durres Co., Ltd., phenol resin, liquid resin PR-53660 * 3 Powdered phenol: Sumitomo Durres Co., Ltd. Phenolic resin, powdered resin PR-311 * 4 From the sound level meter characteristics table, it can be seen that the physical properties necessary for practical use can be arbitrarily obtained by changing the type and blending amount of the binder. ─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] February 21, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0021

[Correction method] Change

[Correction content]

Since the panel material has voids inside,
Thermal insulation, sound absorption, excellent flame retardancy and heat resistance, because of the use of further waste magnetic tape as a raw material, excellent antistatic performance and electromagnetic waves Rudo performance, is inexpensive lightweight.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location B29K 105: 26 B29L 31:58

Claims (2)

[Claims] 1. A shrinking piece of waste magnetic tape obtained by cutting or crushing waste magnetic tape such as video tape and cassette tape into an appropriate size and subjecting to heat treatment,
An automotive panel material obtained by adding a binder and press-molding. 2. A waste magnetic tape such as a video tape or a cassette tape is cut or crushed into an appropriate size, heat-treated, added with a primary binder and a secondary binder, temporarily molded with the primary binder, and then the secondary binder. A method for producing a panel material for automobiles, which is characterized by performing pressure molding according to.