JP2003119380A - Flame-retardant molded product, reflector substrate for illuminating equipment and reflector for illuminating equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lightweight flame-retardant molded product (a reflector substrate for illuminating equipment) having excellent surface smoothness, safety, moldability, heat resistance and handleability and a low-cost and high-quality reflector for the flame-retardant illuminating equipment. SOLUTION: This flame-retardant molded product (the reflector substrate for the illuminating equipment) comprises a specific thermoplastic aromatic polyimide film and has >=210 and <=290 deg.C glass transition temperature and V0 flame-retardant performances in UL94 tests. The reflector for the illuminating equipment is provided with a reflecting layer formed on the substrate by vapor deposition.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molded body suitable for use as a lamp reflector of, for example, an automobile headlamp or fog lamp, a reflector base material for lighting equipment made of this molded body, and a base material formed from this base material. The present invention relates to improvements in reflectors for illuminators, and more specifically, it is lightweight and has excellent surface smoothness, safety, moldability, heat resistance and handleability, and is used as a reflector base material for lighting equipment such as lamp reflectors. A flame-retardant molded product suitable for use, and it is suitable for mass production without the need for pretreatment when forming a reflective layer, is lightweight and has high specularity, and has excellent heat resistance, heat dissipation, safety and handling. , A low-cost and high-quality reflector for flame-retardant lighting equipment.

[0002]

2. Description of the Related Art As headlamps (headlights) for automobiles and reflectors (lamp reflectors) for fog lamps, injection moldings or compression moldings of glass, metals such as aluminum and plastics such as polyphenylene sulfide and unsaturated polyester resin. For a molded body composed of a body,
As a reflective material, a material having a metal reflective layer formed of aluminum, nickel-chromium alloy, titanium oxide or the like is mainly used.

That is, a light bulb such as a halogen bulb and a xenon bulb is used as a light source for a headlight (headlight) and a fog lamp of an automobile, and the temperature around the base of the bulb is heated to a high temperature of 200 ° C. or more. Therefore, as the base material of the reflector, an injection-molded body or a compression-molded body of glass, metal or plastic whose heat resistance is improved by mixing an inorganic reinforcing material such as glass fiber or calcium carbonate is used. -ing

However, the glass-based reflector substrate has problems such as a large weight and easy breakage. In addition, in the case where the metal and the reinforced resin molded body are used as the reflector base material, in addition to the large weight, in order to improve the reflective mirror surface performance (smoothness), a resin coat or the like before the reflective material is vapor-deposited is used. There is a problem that secondary processing is required and the number of manufacturing processes is large.

Moreover, although the one using the reinforced resin molded body as the reflector base material is lighter in weight than the one using the metal as the reflector base material, the viewpoint of the strength of the base material and the restriction on the molding technique. Since it requires a considerable thickness, the heat dissipation of the base material itself is low, and there is concern about heat retention in the shape retention of lamps that have a structure such as projector type that easily accumulates. There was a problem of promoting the rise and shortening the life of the light bulb itself.

Further, in the case where the reinforced resin molded body is used as the reflector base material, a gas such as a chlorine compound may be generated when the lamp is lit and heated, and this gas adheres to and solidifies on the front lens of the headlamp or the like. It also included the problem of clouding the lens and degrading lamp performance.

On the other hand, Japanese Utility Model Publication No. 62-10887 discloses a sheet-made reflector made of a film sheet which is mirror-finished by aluminum vapor deposition, and the sheet-made reflector is degreased for obtaining specularity. However, since the film sheet used here is made of polyethylene, which is inferior in heat resistance, the reflector made of this sheet is used as a head using a high heat lamp such as a halogen bulb. It was impossible to apply it as a reflector for a lamp or the like in terms of heat-resistant shape retention.

Further, Japanese Patent Publication No. 5-88481 discloses that
The reflector base material made of a polyimide resin and polyetherketone resin film, a reflective mirror formed by forming a visible light reflection infrared transmission multilayer film is described, and in addition to such damage resistance, the polyimide resin, etc. It has been disclosed that the use of a material that can withstand the heat generated by halogen bulbs, etc., but this reflecting mirror is one in which a visible light reflecting infrared transmitting multilayer film is formed on a substrate, It was not practical as a reflector for headlamps and fog lamps.

Further, Japanese Patent Application Laid-Open No. 10-96765 discloses a reflector base material for a lighting device, which comprises a molded body of an aromatic polyimide film or an aromatic polyamide film. In addition to being hard to break, this reflecting mirror can withstand the heat generated by halogen bulbs by using a polyimide film, but as a reflector base material for this lighting equipment, a non-thermoplastic film or glass is used. When a thermoplastic film with a high transition point is used, the heating temperature required for the film during the molding process is high, and it is difficult to control the temperature conditions, so it is not suitable for vacuum forming. Molding requires a long time for heating and cooling the mold, which results in longer molding time, which is not suitable for practical use in terms of cost and mass production. Conversely, when a thermoplastic film with a low glass transition point is used, Had a problem that the obtained reflector base material for lighting equipment was inferior in heat resistance.

In view of such circumstances, the inventors of the present invention continued to study, and as a result, a reflector base material for a lighting device comprising a molded body of a specific thermoplastic aromatic polyimide film was proposed in Japanese Patent Application No. 11-
It was previously proposed as No. 262909. This reflector base material for lighting equipment is lightweight, has excellent surface smoothness, safety, moldability, heat resistance and handleability, and is suitable for mass production without the need for pretreatment when forming a reflective layer. It has high properties, excellent heat resistance, heat dissipation, safety, and handling, and has the characteristics of low cost and high quality. However, since this reflector base material for lighting equipment fails the UL94 flame retardancy test, it is required to realize a reflector base material for lighting equipment that is further imparted with flame retardancy in addition to the above characteristics. It was being done.

[0011]

SUMMARY OF THE INVENTION The present invention has been achieved as a result of studying the solution of the above-mentioned problems in the prior art.

Therefore, the first object of the present invention is that it is lightweight and has excellent surface smoothness, safety, moldability, heat resistance and handleability, and is used as a reflector base material for lighting equipment such as lamp reflectors. It is to provide a suitable flame-retardant molded article.

A second object of the present invention is that it is suitable for mass production without the need for pretreatment when forming a reflective layer, is lightweight and has high specularity, and is excellent in heat resistance, heat dissipation, safety and handling. At the same time, it is to provide a low-cost and high-quality reflector for flame-retardant lighting equipment.

[0014]

In order to achieve the first object, the flame-retardant molded article of the present invention is a molded article comprising a thermoplastic aromatic polyimide film, and the polyimide film has the following general composition. A thermoplastic aromatic polyimide having structural units represented by formulas (I) and (II) (provided that the molar ratio of X: Y in the formula is in the range of 60 to 10:40 to 90), and said polyimide The glass transition temperature of the film is 210 ° C or higher and 290 ° C or lower, and U
It is characterized by having V0 flame retardancy in the L94 test.

[0015]

[Chemical 4]

[0016]

[Chemical 5] [However, R ₁ in the formula is

[0017]

[Chemical 6] Is one selected from the groups represented by. In the flame-retardant molded article of the present invention, the thermoplastic aromatic polyimide has a molar ratio of X: Y of 40 to 2
0:60 to 80, the molded body is formed by hot-press molding or vacuum molding of a polyimide film, and the molded body forms a reflective surface, It is a preferable embodiment to have the flange portion and the inner flange portion.

Further, in order to achieve the above second object,
The reflector base material for flame-retardant lighting equipment of the present invention is characterized by comprising the above flame-retardant molded article, and the reflector for flame-retardant lighting equipment of the present invention is for the above-mentioned flame-retardant lighting equipment. The reflective layer is formed by depositing a reflective material on the reflector base material.

In the flame-retardant lighting device reflector of the present invention, it is preferable that the reflector is aluminum or silver and that the reflector is used as a lamp reflector. .

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below. First, the thermoplastic aromatic polyimide film which is the base material of the flame-retardant molded article of the present invention will be described.

The raw material polymer constituting the thermoplastic aromatic polyimide film of the present invention is a film made of a thermoplastic aromatic polyimide having the structural units represented by the above general formulas (I) and (II). In the structural units represented by the above general formulas (I) and (II), the molar ratio of X: Y in the formula is in the range of 60 to 10:40 to 90, preferably in the range of 40 to 20:60 to 80. And a glass transition temperature of 210 ° C. or higher and 290 ° C. or lower, UL9
It is an important requirement to have V0 flame retardancy in the 4 tests. Here, when the molar ratio of X: Y is out of the above range, it is not possible to obtain a polyimide film retaining the flame retardancy of V0 in the UL94 test, or the glass transition temperature is 210 ° C. or higher and 290 ° C. or lower. It is not preferable because it is out of the range.

The thermoplastic aromatic polyimide film of the present invention can be produced by a generally known method. As an example thereof, a polyamic acid is cast on a support in a solution state to give a self-supporting polyamic acid. After obtaining the acid film, the polyamic acid can be produced by heating and imidizing the polyamic acid.

The above polyamic acid solution is obtained by polymerizing at least one diamine component and at least one tetracarboxylic dianhydride.

As a method for polymerizing the polyamic acid solution,
After the diamine compound is placed in the solvent, one or more tetracarboxylic dianhydrides are added to the reaction components in an amount of 95 to 105
After mixing at a ratio of mol% for a time necessary for the reaction, a diamine compound is further added, and subsequently, one or more tetracarboxylic dianhydrides are mixed with all the diamine components and all the tetracarboxylic dianhydride components. A method of adding and polymerizing so as to be an equal amount, and after putting one or more kinds of tetracarboxylic dianhydride in a solvent, the diamine compound is reacted at a ratio of 95 to 105 mol% with respect to the reaction components. After mixing for a required time, one or more tetracarboxylic acid dianhydrides are added, and then a diamine compound is added so that the total diamine component and the one or more tetracarboxylic acid dianhydride components are approximately equal in amount. And a method of polymerizing the same.

Specific examples of the above polyamic acid include diaminodiphenyl ether, 1,3bis- (4aminophenoxy) benzene, 2,2-bis [4- (4-aminophenoxy) phenyl] propane, 4,4'-. Bis (4-
Diamine components such as aminophenoxy) biphenyl, 1,4-bis (4-aminophenoxy) benzene, and phenylenediamine, and pyromellitic acids represented by pyromellitic dianhydride, and 3,3′-4,4. '-Biphenyltetracarboxylic acid or its dianhydride or 3,3'-
A compound obtained by polymerizing an aromatic tetracarboxylic acid compound having two or more benzene rings such as 4,4′-benzophenonetetracarboxylic acid or a dianhydride thereof in a solvent to form a thermoplastic polyimide. Is mentioned.

As the solvent used in the above polymerization, dimethyl sulfoxide, N, N-dimethylacetamide,
Examples thereof include N, N-diethylacetamide, N, N-dimethylformamide, N, N-diethylformamide, N-methyl-2-pyrrolidone and dimethyl sulfone, and these are preferably used alone or in combination.

The polyamic acid obtained by the above polymerization is
It is adjusted to be 10 to 30% by weight in the solvent.

Next, an example of a method for obtaining a thermoplastic aromatic polyimide film from the obtained polyamic acid solution will be described.

First, an extrusion die is used to cast the above polyamic acid solution on a support to obtain a self-supporting polyamic acid film. Then, the end of the obtained polyamic acid film was fixed, and the temperature was changed from 200 ° C. to 40 ° C.
A multilayer polyimide gel film is obtained by heat treatment at a temperature of 0 ° C.

In the heat treatment step, it is preferable to stretch the film in the longitudinal direction at a ratio of 1.05 to 1.5 and in the transverse direction at a ratio of 1.05 to 2.0. By performing such biaxial stretching, it is possible to improve the mechanical properties and further improve the isotropy of the obtained polyimide film.

In the above, the support is glass,
It means a metal, a polymer film or the like having a flat surface and capable of supporting the cast polyamic acid when the polyamic acid is cast thereon.

Further, in the above, casting means spreading a polyamic acid on a support. Examples of casting include bar coating, spin coating, or a method in which a polyamic acid is extruded from a pipe-shaped substance having an arbitrary hollow shape and spread on a support.

When the obtained polyamic acid is cyclized into a thermoplastic aromatic polyimide film, a chemical ring-closing method of dehydrating using a dehydrating agent and a catalyst, a thermal ring-closing method of thermally dehydrating, or both of them. It may be carried out by any of the ring closure methods in which

Examples of the dehydrating agent used in the chemical ring-closing method include aliphatic acid anhydrides such as acetic anhydride and acid anhydrides such as phthalic anhydride. These are preferably used alone or in combination. . As the catalyst, pyridine,
Heterocyclic tertiary amines such as picoline and quinoline, aliphatic tertiary amines such as triethylamine, N, N-
Examples thereof include tertiary amines such as dimethylaniline, and it is preferable to use these alone or in combination.

The thermoplastic aromatic polyimide film thus obtained preferably has a thickness of about several micrometers to several millimeters.

As the thermoplastic aromatic polyimide film, both stretched and unstretched films can be used, but a film containing an inorganic or organic additive for the purpose of improving processability is generally flame-retardant molded. It is not preferable because it reduces the surface smoothness of the body.

Further, addition of a flame retardant to a thermoplastic aromatic polyimide as a film base material for imparting flame retardancy generally lowers the surface smoothness of the molded product and also causes heating by a headlamp. It is not preferable because degassing may occur.

The flame-retardant molded article, the flame-retardant lighting device reflector base material, and the flame-retardant lighting device reflector of the present invention will be described in more detail with reference to the drawings. FIG. FIG. 2 is a partially cutaway perspective view showing an example of a reflector base material for equipment, and FIG. 2 is a partially cutaway side view showing an example of a reflector for lighting equipment of the present invention.

The molded product in the present invention means an object molded into a three-dimensional shape. When this molded product is used as a base material of a reflector, it is expressed as a reflector base material, but there is no difference between the two except that the use is limited.

As shown in FIG. 1, the reflector base material (flame-retardant molded article) 1 for flame-retardant lighting equipment of the present invention has a glass transition temperature of 210 ° C. or higher and 290 ° C. or lower, and the UL94 test. In the above, the thermoplastic aromatic polyimide film having the flame retardancy of V0 is formed by heat-molding or vacuum-forming, and the main body 2, the outer flange 4 and the inner portion 2 forming the reflection portion are formed. It has a flange portion 6, and this example is constructed as a lamp reflector base of a headlamp for an automobile.

In the reflector base material 1 for lighting equipment,
The surface smoothness of the main body 2 retains the smoothness of the film as it is, and has sufficient performance to obtain a reflecting surface for a projector without any pretreatment before vapor deposition of the reflecting layer. ing.

If the strength of the main body 2 becomes a problem, a frame made of plastic injection-molded resin, metal stamped parts, FRP or the like is attached to the outside of the main body 2 for easy reinforcement. be able to.

In the embodiment shown in FIG. 1, the main body 2 has a simple reflecting surface shape.
Any shape can be selected as long as it has a shape such as a polyhedron.

The reflector 8 for lighting equipment shown in FIG.
The reflective layer 10 is formed on the inner peripheral surface of the molded body 1 shown in FIG. 1 by vapor-depositing a reflective material such as aluminum by a known method. In the process of forming the reflective layer 10,
Since the reflector base material 1 retains the smoothness of the film as it is, there is no need to perform any pretreatment such as resin coating or degreasing.

In the reflector base material 1 for lighting equipment shown in FIG. 2, an insertion port 12 of a light bulb (not shown) is opened at the center of the inner flange portion 6 and the periphery of the insertion port 12 is opened. The lamp reflector is configured by forming the inner flange 6a on the.

The reflector base material (flame-retardant molding) shown in FIG.
In 1, the outer flange portion 4 was formed into the final shape of the reflector 8 for lighting equipment shown in FIG. 2, but industrially, a plurality of reflector base materials 1 were formed side by side on one film, and vapor deposition was performed. After processing, the outer flange portion 4 may be cut off while adjusting its outer shape.

The flame-retardant molded article 1 of the present invention is obtained by molding the above-mentioned thermoplastic aromatic film into a desired shape by means such as hot embossing molding, vacuum molding and high pressure gas blowing molding. However, the vacuum forming is the most convenient, the die cost is low, and the simultaneous forming of many pieces is possible, which is economically advantageous. The vacuum forming method includes a straight method, a drape method, an air slip method, a snapback method and a plug assist method, but any known method can be applied.

From the viewpoint of reflectance, aluminum or silver is most suitable as the metal to be vapor-deposited on the reflector base material (flame-retardant molded body) 1 for lighting equipment as a reflector.
A chemically stable metal compound can be used as appropriate, and chromium and a nickel-chromium alloy can also be used as a base for improving the adhesion strength with a reflector or a film.

As the vapor deposition means for forming the reflective layer 10, a vacuum vapor deposition method, a sputtering method, an electron beam method, an ion plating method or the like can be used, but the present invention is not particularly limited thereto. . Further, a protective film may be further formed on the obtained reflective layer 10 by coating, vapor deposition or the like for use.

The shape of the reflector 8 for the flame-retardant lighting device of the present invention may be any shape used as a head lamp or fog lamp, and the reflection layer 10 is provided only on the reflection-required portion of the reflector substrate 1. It may be formed.

Further, the reflective layer 110 can be formed on the side opposite to the light bulb with respect to the reflector base material 1. In this case, by providing the reflective layer 10 on the outer side of the light bulb, the thermoplastic aromatic polyimide film is formed. The primary color of yellow can be obtained as reflected light.

Since the flame-retardant molded article of the present invention is made of a specific thermoplastic aromatic polyimide film having excellent flame retardancy and heat resistance, it has good surface smoothness and has a good surface smoothness before forming a reflective layer. Not only does it require no treatment, it can be obtained at low cost by a simple forming method such as vacuum forming, and is extremely lightweight and resistant to breakage, so it is excellent in safety and handleability.

The reflector for flame-retardant lighting equipment of the present invention is provided on a reflector substrate made of a molded body of a specific thermoplastic aromatic polyimide film having excellent flame retardancy, heat resistance and surface smoothness. Since a reflective layer is formed by vapor deposition on
No pre-treatment such as resin coating is required before vapor deposition of the reflective layer, it can be obtained at low cost by mass production, and it is extremely lightweight and difficult to break, and does not cause degassing which is a practical obstacle when the lamp is lit. Therefore, not only is it excellent in heat dissipation, safety and handling, but also flame retardant,
It has high heat resistance and high specularity, and exhibits high quality performance as a lamp reflector.

[0054]

EXAMPLES The present invention will be described in more detail with reference to the following examples.

[Example 1] 50 equipped with a DC stirrer
In a 0 ml separable flask, 2,2-bis [4- (4
-Aminophenoxy) phenyl] propane 13.27 g
(32 mmol), 4,4′-diaminodiphenyl ether 6.48 g (32 mmol) and N, N′-dimethylacetamide 148.90 g were added, and the mixture was stirred at room temperature under a nitrogen atmosphere. Next, 21.67 g (67 mmol) of pyromellitic dianhydride was charged in several times over 30 minutes to 1 hour. After stirring for 1 hour, 10.95 g of an N, N′-dimethylacetamide solution (6% by weight) of pyromellitic dianhydride was added dropwise over 30 minutes, and the mixture was further stirred for 1 hour. The viscosity of the polyamic acid obtained here was 2500 poise.

A part of the obtained polyamic acid was taken on a polyester film, and a uniform film was formed using a spin coater. This was immersed in a β-picoline / acetic anhydride mixed solution (50:50) for 5 minutes for imidization. The obtained polyimide gel film is 200 ° C for 30 minutes, 300 ° C 2
Heat treatment was performed for 0 minutes at 400 ° C. for 5 minutes to obtain a thermoplastic aromatic polyimide film. The obtained polyimide film has a thickness of 100 μm, a Young's modulus of 3.0 GPa,
The CTE was 60 ppm / ° C and the TG was 240 ° C. Using the obtained polyimide film, by vacuum forming,
A reflector base material (lamp reflector base material) for an automobile headlamp having the shape shown in FIG. 1 was obtained.

Regarding this lamp reflector base material, UL
As a result of conducting 94 (flame retardancy test of polymer material) by the method specified by UL, it was confirmed that the flame retardancy level was 94V-0.

[Example 2] 50 equipped with a DC stirrer
In a 0 ml separable flask, 2,2-bis [4- (4
-Aminophenoxy) phenyl] propane 10.99 g
(27 mmol), 4,4′-diaminodiphenyl ether 8.04 g (40 mmol) and N, N′-dimethylacetamide 148.90 g were added, and the mixture was stirred at room temperature under a nitrogen atmosphere. Next, 21.67 g (67 mmol) of pyromellitic dianhydride was charged in several times over 30 minutes to 1 hour. After stirring for 1 hour, 10.95 g of an N, N′-dimethylacetamide solution (6% by weight) of pyromellitic dianhydride was added dropwise over 30 minutes, and the mixture was further stirred for 1 hour. The viscosity of the polyamic acid obtained here was 2800 poise.

A part of the obtained polyamic acid was placed on a polyester film and a uniform film was formed using a spin coater. This was immersed in a β-picoline / acetic anhydride mixed solution (50:50) for 5 minutes for imidization. The obtained polyimide gel film is 200 ° C for 30 minutes, 300 ° C 2
Heat treatment was performed for 0 minutes at 400 ° C. for 5 minutes to obtain a thermoplastic aromatic polyimide film. The obtained polyimide film has a thickness of 100 μm, a Young's modulus of 3.0 GPa,
The CTE was 60 ppm / ° C and the TG was 245 ° C. Using the obtained polyimide film, by vacuum forming,
A reflector base material (lamp reflector base material) for an automobile headlamp having the shape shown in FIG. 1 was obtained.

Regarding this lamp reflector base material, UL
As a result of conducting 94 (flame retardancy test of polymer material) by the method specified by UL, it was confirmed that the flame retardancy level was 94V-0.

[Example 3] 50 equipped with a DC stirrer
In a 0 ml separable flask, 2,2-bis [4- (4
-Aminophenoxy) phenyl] propane 8.53 g
(21 mmol), 4,4′-diaminodiphenyl ether (9.71 g, 49 mmol) and N, N′-dimethylacetamide (148.90 g) were added, and the mixture was stirred at room temperature under a nitrogen atmosphere. Next, 21.67 g (67 mmol) of pyromellitic dianhydride was charged in several times over 30 minutes to 1 hour. After stirring for 1 hour, 10.95 g of an N, N′-dimethylacetamide solution (6% by weight) of pyromellitic dianhydride was added dropwise over 30 minutes, and the mixture was further stirred for 1 hour. The viscosity of the polyamic acid obtained here was 3000 poise.

A part of the obtained polyamic acid was taken on a polyester film, and a uniform film was formed using a spin coater. This was immersed in a β-picoline / acetic anhydride mixed solution (50:50) for 5 minutes for imidization. The obtained polyimide gel film is 200 ° C for 30 minutes, 300 ° C 2
Heat treatment was performed for 0 minutes at 400 ° C. for 5 minutes to obtain a thermoplastic aromatic polyimide film. The obtained polyimide film has a thickness of 100 μm, a Young's modulus of 3.0 GPa,
The CTE was 60 ppm / ° C and the TG was 250 ° C. Using the obtained polyimide film, by vacuum forming,
A reflector base material (lamp reflector base material) for an automobile headlamp having the shape shown in FIG. 1 was obtained.

Regarding this lamp reflector base material, UL
As a result of conducting 94 (flame retardancy test of polymer material) by the method specified by UL, it was confirmed that the flame retardancy level was 94V-0.

[Comparative Example 1] 50 equipped with a DC stirrer
In a 0 ml separable flask, 2,2-bis [4-
(4-Aminophenoxy) phenyl] propane 34.1
2 g (249 mmol) and 207.71 g of N, N'-dimethylacetamide were added, and the mixture was stirred at room temperature under a nitrogen atmosphere. 3, 4, 3 ', 4 from 30 minutes to 1 hour
′ -Benzophenone tetracarboxylic acid dianhydride 25.9
8 g (242 mmol) was added in several times. After stirring for 1 hour, 13.39 g of a solution of pyromellitic dianhydride in N, N′-dimethylacetamide (6% by weight) was added to 3 parts.
The mixture was added dropwise over 0 minutes, and further stirred for 1 hour. The viscosity of the polyamic acid obtained here was 2500 poise.

Next, a part of the obtained polyamic acid was taken on a polyester film, and a uniform film was formed using a spin coater. This was immersed in a β-picoline / acetic anhydride mixed solution (50:50) for 5 minutes for imidization. About the obtained polyimide gel film, 200 ° C. 30
Min, 300 ° C. for 20 minutes, 400 ° C. for 5 minutes to obtain a polyimide film. The obtained thermoplastic aromatic polyimide film had a thickness of 125 μm and a Young's modulus of:
3.2 GPa, CTE: 60 ppm / ° C., TG: 230
It was ℃. The obtained film was used to obtain a reflector base material (lamp reflector base material) for an automobile headlamp having a shape shown in FIG. 1 by vacuum forming.

Regarding this lamp reflector base material, UL
As a result of conducting 94 (flame retardancy test of polymer material) by the method specified by UL, it was confirmed that the flammability level was obtained.

The surface smoothness of each of the lamp reflector base materials obtained in the above-mentioned Examples and Comparative Examples maintained the smoothness of the film as it was, and was sufficient to obtain a reflecting surface for a projector. .

Then, aluminum is vapor-deposited on each of the lamp reflector base materials by a known vacuum vapor deposition method,
A reflective layer having a thickness of 0.3 μm was formed. In this reflective layer forming step, no pretreatment such as resin coating or degreasing was performed, but in any case, a very smooth vapor deposition surface could be formed. Then, an insertion port of the light bulb was opened in the center of the inner flange portion, and an inner flange was formed around the insertion port. In any case, the smoothness of the obtained reflective layer was extremely high, and sufficient reflected light could be obtained when it was used as a lamp reflector for a headlamp.

Moreover, the reflectors for lighting equipment obtained in the examples are much lighter in weight than other parts of the headlamp, and the thermoplastic aromatic polyimide film is excellent in flame retardancy and heat dissipation and has a thickness. Since it is thin, the heat of the lamp can be prevented from staying inside the reflector, and the durability of the reflector and the lamp can be improved, but the reflector for lighting equipment obtained in the comparative example is flame-retardant. Because it does not have
If the lamp comes into contact with the reflector for some reason, such as improper installation of the lamp, there is a risk of the reflector catching fire. On the other hand, in the reflector of the embodiment, even in the above case, only a part of the reflector was deformed, and the safety was remarkably improved.

[0070]

As described above, the flame-retardant molded article (reflector base material for flame-retardant lighting equipment) of the present invention is a specific thermoplastic aroma having excellent flame retardancy and heat resistance. Since it is made of a group polyimide film, its surface smoothness is good, and not only pretreatment at the time of forming a reflective layer is not necessary, but it can be obtained at a low cost by a simple molding method such as vacuum molding,
Moreover, it is extremely lightweight and hard to break, so it is excellent in safety and handling.

Further, the reflector for flame-retardant lighting equipment of the present invention is a reflector base comprising a molded body of a specific thermoplastic aromatic polyimide film having excellent flame retardancy, heat resistance and surface smoothness. Since the reflective layer is formed by vapor deposition on the material, there is no need to perform pretreatment such as resin coating before vapor deposition of the reflective layer, it can be obtained at low cost by mass production, and it is extremely lightweight and not easily damaged Since there is no degassing, which is a practical obstacle when the lamp is lit,
In addition to being excellent in heat dissipation, safety and handling, it is highly flame-retardant, heat-resistant and specular, and exhibits high-quality performance. It is a lamp reflector for automobile headlights, fog lamps, large floodlights, etc. Can be used advantageously.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing an example of a flame-retardant molded article (reflector base material for lighting equipment) of the present invention.

FIG. 2 is a partially cutaway side view showing an example of the flame retardant lighting device reflector of the present invention.

[Explanation of symbols]

1 Flame-retardant molding (reflector base material for lighting equipment) 2 body 4 Outer flange 6 Inner flange 6a Inner flange 8 Reflectors for flame retardant lighting equipment 10 Reflective layer 12 Light bulb outlet

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) F21V 7/22 C08L 79:08 B F21W 101: 10 17/00 F21M 3/02 E // (C08L 79 / 08 79:08) F21W 101: 10 F term (reference) 3K042 AA08 AB01 AB04 BB00 4F071 AA60 AA86 AF47 AF47Y AH11 AH12 AH19 BA01 BB06 BB13 BC01 BC07 4J002 CM04W CM04X GN00 GP00

Claims (8)

[Claims] 1. A molded article comprising a thermoplastic aromatic polyimide film, wherein the polyimide film has a thermoplastic aromatic polyimide having structural units represented by the following general formulas (I) and (II) (wherein The molar ratio of X: Y is in the range of 60 to 10:40 to 90), and the glass transition temperature of the polyimide film is 2
A flame-retardant molded article having a flame retardancy of V0 in a UL94 test at a temperature of 10 ° C. or higher and 290 ° C. or lower. [Chemical 1] [Chemical 2] [However, R ₁ in the formula is Is one selected from the groups represented by. ] 2. The flame-retardant molded article according to claim 1, wherein the X: Y molar ratio in the thermoplastic aromatic polyimide is in the range of 40 to 20:60 to 80. 3. The flame-retardant molded article according to claim 1, wherein the molded article is formed by subjecting a polyimide film to hot embossing molding or vacuum molding. 4. The flame-retardant molded article according to claim 1, wherein the molded article has a main body portion that forms a reflection surface, an outer flange portion, and an inner flange portion. . 5. A reflector base material for a flame-retardant lighting device, comprising the flame-retardant molded article according to claim 1. 6. A reflector for flame-retardant lighting equipment, wherein a reflective layer is formed by vapor-depositing a reflecting material on the reflector base material for flame-retardant lighting equipment according to claim 5. 7. The reflector for flame-retardant lighting equipment according to claim 6, wherein the reflector is aluminum or silver. 8. The reflector for flame-retardant lighting equipment according to claim 6, which is used as a lamp reflector of a vehicle.