JPH0889891A - Coated metal plate with touch of small frictional resistance - Google Patents

Abstract

PURPOSE: To obtain a coating with a surface which is hardly damaged and has touch of small frictional resistance to a human body by the baking finish of a metal plate coated with a coating containing a mixture of polytetrafluoroethylene and a heat resistant resin as a main component in a coated metal plate which is used in a part contacting passengers such as the handrail of an escalator. CONSTITUTION: A coated metal plate is formed by the baking finish of a metal plate 13 coated with a coating which contains a mixture of polytetrafluoroethylene 11 and a heat resistant resin 12 as a main component and has a baking point of at least the melting point of polytetrafluoroethylene. Polyphenylenesulfide, polyethersulfone, polyamide, etc., are used as the heat resistant resin 12. By the incorporation of polytetrafluoroethylene 11 into a film as a component resin, good adhesion is obtained between the heat resistant resin 12 and the metal substrate 13. The film with good lubricity and non stickiness is obtained by the coexistence of the heat resistant resin 12 with polytetrafluoroethylene 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coated metal plate used for a portion such as an escalator, a handrail of a balustrade on a moving walkway, an interior panel, a skirt guard and the like which come into contact with a passenger.

[0002]

2. Description of the Related Art In recent years, pedestrian decks and skyways are used to separate pedestrian paths so that pedestrians can move comfortably and safely, and many escalators and moving walkways are installed as means for assisting walking. It started to come.

The escalator assists the pedestrian's ups and downs by slowly moving the steps, and secures passengers' safety by providing balustrades on both sides of the steps. FIG. 3 shows an outline thereof, in which the entire escalator is supported by the main frame 1 and the step 2 is circulated by the chain 3. And the handrail 5 covering the side wall 4 and its cross section.
And make up the balustrade. The inside of the balustrade is in direct contact with passengers, but its structure is as shown in Fig. 4 when viewed from the traveling direction. The hand frame 6 supports the handrail 5 and the upper end of the interior panel 7 is fitted therein. A skirt guard 8 is provided between the interior panel 7 and the step 2 to ensure the safety of passengers' feet. 9 is a balustrade support.

The hand frame, the interior panel and the skirt guard are generally manufactured by using a stainless steel plate having a thickness of about 2 mm and having a hairline-finished surface.

However, the hand frame is often touched by the passenger's hand when getting on and off, and the interior panel and the skirt guard frequently come into contact with the passenger's clothes. When the passengers come into contact with each other, friction is generated in the moving direction, and there is a risk that the passengers may fall or have their hands burned.

In order to avoid this danger, measures have been taken to make the surfaces of these members slippery, and it has been proposed to apply silicone oil to the skirt guard or to attach an ultrathin Teflon sheet. However, when silicone oil is applied, it must be applied every day in addition to adhering to passengers' clothes and the like. The Teflon sheet has a small coefficient of friction and is slippery, but it has a defect that the attached sheet is easily peeled off and damaged.

In the past, in such an attempt, Japanese Patent Publication No.
No. 60274 proposes a skirt guard in which a synthetic resin plate such as high-density polyethylene is attached to a steel plate, and in Japanese Patent Laid-Open No. 6-40687, an acrylic silicon clear coating is also used for aesthetic purposes. A balustrade member in which a hairline-finished stainless steel plate is applied is proposed.

[0008]

However, none of the above solutions are sufficient. That is, the method of attaching the synthetic resin may deform due to the difference in the thermal expansion coefficient between the steel plate and the synthetic resin. The construction for preventing this is complicated and the slipperiness is not sufficient. Further, there is a problem in that the slipperiness is not sufficient even with acrylic silicone coating.

The present invention has been made to solve this problem, and an object of the present invention is to provide a coated metal plate having a surface that is not easily scratched, has durability, and has a feeling of friction resistance against the human body. It is a thing.

[0010]

[Means for Solving the Problems] A means for achieving this object is to use a paint whose main component is a mixture of a tetrafluoroethylene resin and a heat-resistant resin and whose coating baking temperature is not lower than the melting point of the tetrafluoroethylene resin. It is a painted metal plate that has been baked and painted on the plate to reduce the friction resistance. As the heat-resistant resin, polyphenylene sulfide resin, polyether sulfone resin,
Polyamideimide resin and the like can be preferably used.

[0011]

Among the synthetic resins, tetrafluoroethylene resin, which is commonly called Teflon resin, is known as a resin having the smallest friction coefficient and rich in lubricity and non-adhesiveness. On the other hand, however, this property hinders the adhesion to the substrate, and a Teflon sheet-attached stainless steel plate has a drawback that the Teflon sheet is easily peeled off.

In the present invention, this drawback has been solved by including a tetrafluoroethylene resin as a component resin in the coating film. That is, since a heat-resistant resin such as polyphenylene sulfide resin, polyether sulfone resin or polyamide imide resin can obtain good adhesion with the metal substrate,
By coexisting these heat-resistant resins with tetrafluoroethylene resin, a coating film rich in lubricity and non-adhesiveness and excellent in adhesiveness was realized.

The reason why the heat-resistant resin coexisting with the tetrafluoroethylene resin exhibits such an excellent effect is considered as follows. There is currently no paint solvent that dissolves the tetrafluoroethylene resin. Therefore, in the coating containing tetrafluoroethylene resin, the average particle size of tetrafluoroethylene resin is several μm.
m as a fine powder and dispersed in the paint.

In the case of the acrylic silicone resin paint, the baking temperature is around 200 ° C., and the tetrafluoroethylene resin powder having a high melting point of about 330 ° C. does not dissolve but remains solid.
For this reason, since the tetrafluoroethylene resin powder forms the coating film in the same shape, the surface that appears on the coating film surface is only a part of the surface of the powder located in the uppermost layer.

This state is schematically shown in FIG. 2 (b). Since the tetrafluoroethylene resin powder 11 is powdery,
Only a portion of the acrylic silicon coating film 14 in contact with the surface contributes to the coating film surface lubrication.

In the case of heat resistant resin coating, the baking temperature is 380 ° C.
At about 400 ° C., this temperature is higher than the melting point of the tetrafluoroethylene resin, and the tetrafluoroethylene resin changes from powder to liquid. Since the liquefied tetrafluoroethylene resin has a small intermolecular force, it is pushed to the surface.

This state is shown in FIG. The tetrafluoroethylene resin 11 is arranged on the surface of the heat resistant resin coating film 12 to form a film. Therefore, the lubricity unique to the tetrafluoroethylene resin can be effectively utilized. Further, the heat-resistant resin component other than ethylene tetrafluoride becomes dominant in the deep layer of the coating film, and good adhesion is obtained with the metal plate 13.

Since the heat-resistant resin acts as described above, a coating film obtained by mixing the heat-resistant resin with a tetrafluoroethylene resin can provide excellent adhesion and excellent slipperiness.

FIG. 1 shows the results of examining the relationship between the content of the tetrafluoroethylene resin contained in the coating film and the slipperiness. The dotted line is for the acrylic silicone resin coating film, and the solid line is for the heat resistant resin coating film.

In the case of an acrylic silicone resin coating film, the slipperiness is improved up to about 30 wt% as the content of the tetrafluoroethylene resin is increased, but if it exceeds this, the effect of increasing the mixing ratio is lost.

In the case of a heat-resistant resin coating film, the effect of improving the slipperiness of containing a tetrafluoroethylene resin is large as a whole, and the effect appears in a wide content range.

It is considered that this difference is due to the difference in the dispersion state of the tetrafluoroethylene resin in the coating film.

As a practical metal plate used in the present invention, an aluminum or aluminum alloy plate, an aluminum-plated steel plate, a stainless steel plate, a chrome-plated steel plate or the like can be used. In general, as a pretreatment for coating, a chemical conversion treatment such as zinc phosphate treatment or chromate treatment is performed according to the metal plate, but in the case of heat-resistant resin coating, general chemical conversion treatment is also effective.

It is also possible to apply an undercoat to improve the adhesion to the base and the corrosion resistance. As the undercoat paint, a heat-resistant resin paint can be used, and a paint containing a rust preventive pigment such as zinc chromate may be used. When trying to obtain a lubricating effect with a small amount of tetrafluoroethylene resin, it is a good idea to apply a thin overcoat after undercoating.

Although pigments may be added to the topcoat, it is desirable that the total amount of pigments does not exceed 40 wt% of the coating solids. Also, the amount of tetrafluoroethylene resin is 5 wt% to 50 wt
% Is appropriate. Fluorine-based resins other than tetrafluoroethylene resin, such as perfluoroethylene alkoxide (P
FA), ethylene tetrafluorofluoroethylene copolymer (ETFE), tetrafluoroethylene hexafluoropropylene copolymer (FEP) and the like also have lubricity, but are slightly inferior to tetrafluoroethylene. However, a part thereof may be replaced with these fluororesins as long as the amount does not exceed ethylene tetrafluoride.

The tetrafluoroethylene resin and other heat-resistant resins are chemically very stable, and the metal plate coated with these resins has excellent corrosion resistance. In addition to this, the heat-resistant resin is hard, and since it contains the tetrafluoroethylene resin, it becomes slippery, so that it is hard to be scratched.
Further, in a general thermoplastic resin coating film, when it is rubbed once, the surface temperature rises due to frictional heat to soften it, making it more difficult to slip, but in a heat-resistant resin coating material, the softening point is high and there is no such possibility.

[0027]

[Example] The coated metal plate of the present invention was applied to a hand frame, an interior panel and a skirt guard of an escalator, and a feeling of friction resistance was investigated and compared with a conventional one.

The details of the coated metal plate and the results of the investigation are shown in Table 1.

[0029]

[Table 1]

In the conventional example, the passenger had a feeling of frictional resistance, and the feeling of frictional resistance was particularly large when the stainless steel plate was left as it was. However, in the embodiment of the present invention, there is almost no feeling of frictional resistance in any part, and the passenger falls over. There was no danger of burns or burns.

[0031]

As described above, in the coated metal sheet according to the present invention, the surface layer is mainly composed of tetrafluoroethylene resin, and the lower layer is coated with a coating film mainly composed of heat resistant resin such as polyphenylene sulfide resin. The surface is slippery, has little friction and is durable. Therefore, by using this coated metal plate in the hand frame of the balustrade of the escalator, the interior panel, the skirt guard, and the like that come into contact with the passenger, the passenger can be prevented from falling or getting burned. Further, the coated metal plate of the present invention can be suitably used for a deck board of a balustrade of a moving walkway, an interior panel, a skirt guard and the like having a structure similar to that of an escalator. Thus, the effect of the present invention that contributes to the safety of escalators and moving walkways is great.

[Brief description of drawings]

FIG. 1 is a diagram showing the relationship between the slipperiness of the surface of a coated metal plate of the invention and the content of a tetrafluoroethylene resin.

FIG. 2 is a sectional view of a coated metal plate of the invention.

FIG. 3 is a side view showing an outline of an escalator.

FIG. 4 is a vertical sectional view showing a configuration of a balustrade.

[Explanation of symbols]

 2 Steps 5 Handrails 6 Handframe 7 Interior panel 8 Skirt guard 11 Tetrafluoroethylene resin 12 Heat resistant resin coating film 13 Metal plate 14 Acrylic silicone resin coating film

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Internal reference number FI Technical display location B05D 5/08 7415-4F 7/24 302 L 7415-4F (72) Inventor Hiroshi Hatano Chiyoda, Tokyo 1-1-2 Marunouchi, Nihon Steel Pipe Co., Ltd. (72) Inventor Masaki Omura 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Inside Nihon Steel Pipe Co., Ltd. (72) Saburo Ito Marunouchi, Chiyoda-ku, Tokyo 1-2 1-Nihon Steel Pipe Co., Ltd.

Claims (1)

[Claims] 1. A frictional resistance, characterized in that a paint having a mixture of a tetrafluoroethylene resin and a heat-resistant resin as a main component and having a coating baking temperature higher than the melting point of the tetrafluoroethylene resin is baked on a metal plate. Painted metal plate with little feeling.