JP2003127285A - Coated material improved in slidability of material surface and cute of automatic vending machine using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coated material which can be baked at a temperature lower than the melting point of polytetrafluoroethylene (PTFE) and can inexpensively treat a metal plate excellent in slidability, etc., with the slidability improved, by a usual pre-coated steel plate continuous coating facility and a chute for an automatic vending machine having excellent slidability especially in a high temperature environment. SOLUTION: The coated material is obtained by forming a coating film on the surface of a material to be treated by a primer containing 95-60 mass % of a matrix resin whose film forming temperature is lower than the melting point of PTFE and PTFE powder 2-15 μm in average particle size as main components, applying a top coat containing 90-45 mass % of a matrix resin whose film forming temperature is lower than the melting point of PTFE, 5-40 mass % of unmelted PTFE powder 2-40 μm in average particle size, and 5-15 mass % of metal flakes 10-40 μm in average particle size on the coating film, and baking at a temperature lower than the melting point of PTFE and higher than the film forming temperature of the matrix resin. The coated material can appropriately used as the chute for the automatic vending machine having high slidability and abrasion resistance even in a high temperature environment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coated article having improved slidability on the material surface. More specifically, the present invention relates to a coated object such as a metal plate having excellent slidability, which is used as a distributor inside an automatic vending machine, a lower part of an escalator side wall, and a material distribution facility member of a mail delivery center.
The present invention further relates to a shooter for a vending machine, which uses the above-mentioned coated product.

[0002]

2. Description of the Related Art Conventionally, polytetrafluoroethylene resin (hereinafter abbreviated as "PTFE"), phenol resin, acetal resin and the like have been known as materials having self-sliding property that do not require lubrication. Concretely, a paint in which PTFE powder is dispersed is post-coated on a stainless metal plate as the escalator side wall lower member, or a PTFE cut-out sheet is attached with an adhesive to the distribution equipment member of the mail delivery center. Has been used.

Here, since the PTFE cut-out sheet is a difficult-to-bond material, it is currently dealt with by adhesive bonding using a double-sided tape, but the problem of adhesive durability remains. On the other hand, in Japanese Unexamined Patent Publication No. 8-57413, surface friction obtained by baking coating a metal plate with a paint containing a matrix resin having good adhesion to a metal plate and PTFE as main components and having a baking temperature higher than the melting point of PTFE. A metal plate having a small coefficient is disclosed. That is, this publication describes a metal plate having improved slidability obtained by baking and coating a paint in which PTFE fine particles are dispersed in a matrix resin at a temperature higher than the melting point of PTFE. There is.

As shown in FIG. 2, the slidability of the metal plate 4 according to the invention described in this publication appears when PTFE melts and migrates to the surface. That is, the PTFE layer 5 has a surface morphology that reduces thermodynamically stable surface tension.
Covers the entire surface of the matrix resin coating film 2, and the high sliding property of the PTFE layer 5 present on this surface reduces the surface friction coefficient. However, in order to melt the PTFE fine particles, it is necessary to bake the matrix resin coating material at a temperature equal to or higher than the melting point of PTFE. Therefore, as the resin constituting the matrix resin coating material, the melting point of PTFE is about 326 ° C. or higher. It was necessary to use a resin having excellent heat resistance that does not cause resin degradation such as thermal decomposition even when the coating film is baked at the temperature. Examples of such a matrix resin include a polyimide resin, a polyamideimide resin, a polyether sulfone resin, a polyphenylene sulfide resin, and the like, but these resins having excellent heat resistance are all very expensive, which is called engineering plastic. It is a resin.

As a preliminary experiment A, the inventors of the present invention have prepared a paint prepared by mixing 10 mass% of general PTFE fine particles (average particle size 0.3 μm) with a silicon-modified polyester resin, which is a relatively inexpensive and general paint for precoated steel sheet. Was applied to the surface of the metal plate. Then, the coating film is baked at 210 ° C, which is the standard baking temperature of the silicone-modified polyester resin paint,
When the coefficient of dynamic friction was measured with the 304BA surface as the opposite side, it was 0.38, which was almost the same value as 0.41 when PTFE fine particles were not mixed, and no improvement in slidability was observed. The reason for this is that since the coating film was baked below the melting point of PTFE, PTFE was uniformly dispersed in the coating film like ordinary pigments, and the slidability did not develop with the migration of PTFE to the coating film surface. Is. here,
The criterion for excellent slidability is a coefficient of dynamic friction of 0.20.
It is less than.

Then, in Preliminary Experiment B, a coating film was baked using the same paint as in Preliminary Experiment A at 380 ° C., and the dynamic friction coefficient was 0.18, showing excellent slidability. It is speculated that this is because the PTFE fine particles were melted and transferred to the surface of the coating film. However, in this case, the silicone-modified polyester resin was obviously thermally deteriorated. That is, when a 90-degree bending test with a radius of curvature of 5 mm was performed as a bending workability test, the coating film peeled off, and when a cross-cut cellophane tape peeling was performed as a coating film adhesion test, peeling of the coating film was observed.

Therefore, in order to improve the slidability, PTFE is used.
When the fine particles are used by melting, there are the following problems. 1) When a relatively inexpensive matrix resin having a heat resistant temperature lower than the melting point of PTFE is used, desired physical properties such as bending strength and surface adhesion cannot be obtained. Therefore, an expensive resin having a melting point higher than that of PTFE cannot be obtained. Need to use. 2) It is necessary to set the baking temperature of the coating film high, and therefore the baking oven capacity and operating conditions are limited. 3) Since the development of slidability is based on the surface migration of PTFE, slidability cannot be expressed when the surface layer made of molten PTFE is worn.

On the contrary, as in the above preliminary experiment A, PT
The desired slidability cannot be obtained even if the FE fine particles are simply dispersed and used without being melted. An example of a field in which such improvement in slidability is required is a shooter for a vending machine. BACKGROUND ART Vending machines can be purchased anywhere, anytime, anywhere, such as beverages, tobacco, and other various types of favorite foods, as well as foods, etc., and are therefore installed at every location. On the other hand, for the purpose of reducing the opportunity to put products into the vending machine in order to reduce the labor cost related to the sale of products in the vending machine,
For a period of time, vending machines, and more specifically, product storage racks, became larger and the installation space for vending machines tended to stick out on the road. However, with such an increase in size,
Various problems have been pointed out, such as obstruction of road traffic depending on the installation location. Therefore, it has been desired to develop a compact vending machine having a small depth and width and a small installation space.

In such a compact vending machine, it is desired to increase the size of the product storage rack in the vending machine as described above. As a method for increasing the size of the product storage rack in such a compact vending machine, a method has been devised to lower the position of the product outlet of the product storage rack to increase the storage amount. At this time, from the viewpoint of design, it is necessary to reduce the inclination of the product guide plate (referred to as a shooter) from the bottom of the product storage rack to the product take-out port. Conventionally, a galvanized steel sheet has been used as a shooter, but with such a shooter, the product may stop in the middle of the shooter. Furthermore, in such a shooter, unlike the case where the product is dropped on a horizontal plane where the contact point of the product and the center of gravity of the product are on a vertical line, the contact point of the product and the position of the center of gravity of the product are misaligned. Since frictional force is generated and wear occurs, wear resistance is required.

For example, as a method for improving the slidability of a shooter, Japanese Unexamined Patent Publication No. 8-57413 discloses a paint containing a mixture of a resin and PTFE having good baking adhesion with a metal plate as a main component. It has been proposed to use a metal plate having a small surface friction coefficient baked on the plate for a shooter.
When such a metal plate is used for the shooter, the product can be stably slid even if the inclination is gentle. The slidability imparted to the metal plate at this time is based on the surface migration of PTFE as described above. Surface PTF
When the E layer wears, it leads to a significant decrease in sliding performance, and the rectangular parallelepiped product form that uses a lot of flat surfaces such as paper packs and PET bottles sold in vending machines has a high probability of stopping in the middle of the shooter part. Can be considered.

Drinking water such as tea, coffee, and black tea may be stored at high temperature (hereinafter referred to as high temperature storage product).
Such high-temperature storage products are stored in a temperature-controlled storage rack. In a shooter compatible with a storage rack, the shooter temperature is set to about 60 to 80 ° C. so that the temperature of the product is not lowered. The abrasion resistance of the resin coating film under such a high temperature environment tends to decrease with the softening of the resin, and when a high temperature product is repeatedly dropped on the resin coating film in this state, the resin coating provided on the shooter as described above is used. A shearing force (deviation) that acts when the film falls is applied to the film, and the resin coating film is likely to peel off. In order to solve the above problems, the present inventor had previously applied for a patent (Japanese Patent Application No. 11-162963) relating to a slidability-improving coated article and a vending machine shooter using the same. As a result of various investigations, it was found that the setting of the shooter temperature was about 60 to 80 ° C., and in the configuration of the prior patent which was set to 60 ° C., sufficient wear resistance was not exhibited under the environment of 80 ° C. could not. Therefore, it has been desired to develop a shooter having a temperature adjusted to suit a product, which is provided with a resin coating film that imparts slidability and has sufficient abrasion resistance even at high temperatures.

[0012]

The object of the present invention was devised to solve the problems that occur when the above-mentioned PTEF fine particles are used by being melted, and baking is performed at a temperature lower than the melting point of PTFE. It provides paints that can be painted and that can be processed with ordinary pre-coated steel plate continuous coating equipment at low cost, and that can treat coated metal plates with excellent slidability, etc. An object is to provide a vending machine shooter having excellent wear resistance.

[0013]

Means for Solving the Problems The inventors of the present invention have made extensive studies to achieve the above-mentioned object, and as a result, the slidability originally possessed by PTFE is transferred to the surface by melting PTFE as described in the prior art. However, when a paint prepared by mixing a predetermined amount of unmelted PTFE particles having a predetermined average particle diameter in a predetermined matrix resin is baked and coated under predetermined conditions, a part of the unmelted PTFE will be the surface of the coating film. It was found that the unexposed PTFE particles exhibit a high slidability by being exposed and exposed to a state of being uniformly dispersed in the coating film. Further, by mixing a predetermined amount of a metal flake-like substrate (hereinafter, abbreviated as metal flake) having a predetermined average particle diameter with a predetermined matrix resin, it is possible to suppress and control damage to the resin coating film when the high temperature product is dropped. I found that In addition, unmelted PTFE having a predetermined average particle size
By providing an undercoating film in which particles are uniformly dispersed,
The present invention has been created by discovering that the sliding property is further improved. It has been found that the use of the thus obtained metal plate exhibiting high slidability and wear resistance under specific conditions is effective as a shooter for a vending machine.

That is, according to the embodiment of the present invention, a matrix resin having a film formation temperature lower than the melting point of PTFE of 95 to 60 mass% and an average particle diameter of 2 to 15 are formed on the surface of the material to be treated.
A film was formed with an undercoating coating material containing 5 to 40% by mass of PTFE powder of μm as a main component.
Matrix resin lower than the melting point of E 90 to 45% by mass
And unmelted PTFE powder 5 having an average particle size of 2 to 40 μm
-40% by mass and 5 to 15% by mass of metal flakes having an average particle size of 10 to 40 μm are applied as a main component, and the coating composition is lower than the melting point of PTFE and lower than the film forming temperature of the matrix resin. The present invention relates to a coated article having a high slidability obtained by baking at a high temperature.

According to an embodiment of the present invention, 95 to 60% by mass of a matrix resin having a film forming temperature lower than the melting point of PTFE on the surface of the material to be treated, and 5 to 40 PTFE powder having an average particle size of 2 to 15 μm. % Of the main component is used as a main component to form a film, and a matrix resin having a film formation temperature lower than the melting point of PTFE of 90 to 45% by mass and an average particle size of 2 to 40 μm are formed on the coating film. Unmelted PTFE powder 5-40
5% by mass and metal flakes having an average particle size of 10 to 40 μm
15% by mass as the main component, and apply a top coat paint,
Metal flakes are uniformly embedded in the top coat film formed by baking at a temperature lower than the melting point of TFE and higher than the film formation temperature of the matrix resin, with the metal flakes buried substantially parallel to the material to be treated. Dispersed in the unmelted P
The present invention relates to a coated article having a high slidability provided with a coating film, characterized in that a part of TFE particles is uniformly dispersed in the coating film in a state of being exposed from the surface of the coating film.

Aspects of the present invention include PTF on the surface of a metal plate.
In a shooter for a vending machine provided with a resin coating containing E and metal flakes, the film-forming temperature is 95 to 60% by mass of a matrix resin lower than the melting point of PTFE,
PTFE powder having an average particle size of 2 to 15 μm 5 to 40% by mass
A film is formed with an undercoating paint containing as a main component, and on the coating film,
Matrix resin 90-45 lower than the melting point of PTFE
Mass% and unmelted PTFE having an average particle size of 2 to 40 μm
A coating material for topcoat mainly composed of 5 to 40% by mass of powder and 5 to 15% by mass of metal flakes having an average particle size of 10 to 40 μm is applied, and the temperature is lower than the melting point of PTFE and the film forming temperature of the matrix resin. The metal flakes are evenly distributed in the top coat film formed by baking at a temperature higher than the above, with the metal flakes being embedded almost parallel to the material to be treated, and some of the unmelted PTFE particles are coated. It is characterized in that it is uniformly dispersed in the coating film in a state of being exposed from the surface, and that the metal flakes mixed in the resin coating film suppress and control the abrasion of the resin coating film at the use temperature.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below. FIG. 1 is a sectional view showing a concept of developing slidability according to the present invention, and FIG. 2 is a sectional view showing a concept of developing slidability according to a conventional technique. The slidability improving mechanism of the present invention, as shown in FIG.
Are evenly dispersed throughout the top coating film 2, and are also present near the surface of the coating film at the same frequency, and unmelted PTFE particles 1 present near the surface of the coating film 2 are partially exposed from the surface of the coating film. Then, the exposed portion exhibits slidability with respect to the target surface. In addition, since the PTFE particles 1 are unmelted particles, the contact area between the exposed portion of the coating film 2 and the target surface is small, and the effect of further increasing the slidability is produced. Since the PTFE particles 1 are uniformly dispersed in the coating film 2, the PTFE particles 1 have a characteristic that the slidability is maintained even if the coating film 2 is worn. In this respect, the conventional PTFE fine particles are melted. Durability is remarkably higher than that of the conventional coating material as shown in FIG. 2 which migrates to the surface to form the PTFE layer 6. As shown in FIG. 1, the mechanism for improving the wear resistance of the present invention is such that the metal flakes 3 are evenly dispersed on the entire surface of the top coat film 2 on the surface of the material 5, so that the shooter can be used as described above.
When heated to about 0 ° C., the amount of abrasion of the coating film 2 can be significantly reduced because the shearing force acting on the coating film 2 that has been heat-softened when the high temperature storage product falls is controlled and controlled. Furthermore, the adhesion can be maintained by providing the undercoating coating film 4, and the abrasion resistance can be improved by blending the PTFE particles 1 in the undercoating coating film 4. The present invention was created from such a viewpoint, and the particle diameters of PTFE and metal flakes in the coating material for improving slidability and wear resistance according to the present invention and the blending amount in the coating material are important factors.

From such a viewpoint, the average particle size of PTFE in the undercoating film of the present invention is in the range of 2 to 15 μm, preferably 2 to 10 μm. When the average particle size of PTFE is less than 2 μm, the PTFE is uniformly dispersed in the coating film, but the abrasion resistance effect of the coating film is difficult to be exhibited. On the other hand, when the particle size of PTFE exceeds 15 μm, the unevenness of the undercoating film becomes large, and uniform coating cannot be performed when applying the topcoating paint. PT in top coating composition of the present invention
The average particle size of FE is in the range of 2 to 40 μm, preferably 2 to 15 μm. When the average particle diameter of PTFE is less than 2 μm, the PTFE particles uniformly dispersed in the coating film are not exposed from the coating film surface, and slidability cannot be exhibited. On the other hand, if the average particle size exceeds 40 μm, the resin coating containing PTFE cannot be applied uniformly on the surface of the undercoat coating film. More specifically, for example, when coating a metal plate with a roll coater, there is a problem in the coating property of the coating material.
The TFE powder is sandwiched between the pickup roll and applicator roll. Further, when coating with a curtain flow coater, the curtain is cut and uniform coating cannot be performed.

The PTFE particles preferably have a spherical particle shape because they take a form protruding from the surface of the coating film, and when the contact area with the target surface is reduced, the slidability is increased. In the present invention, the PTFE particles as described above are blended with the matrix resin (binder resin),
The compounding amount of the PTFE particles at that time is 100 mass% in total.
Is in the range of 5 to 40% by mass. If the content of the PTFE particles is less than 5% by mass, the amount of exposure to the surface of the coating film and the frequency of exposure become low, and sufficient slidability cannot be obtained, which is not preferable. On the other hand, if the content of the PTFE particles exceeds 40% by mass, the physical properties of the coating film, such as bending workability and impact workability, deteriorate, which is not preferable.

The average particle size of the metal flakes in the top coating composition of the present invention is in the range of 10 to 40 μm. The average particle size is represented by the length of the longest part of the metal flakes. If the average particle size of the metal flakes is less than 10 μm, the shearing force applied to the resin coating film by the metal flakes uniformly dispersed in the top coating film cannot be effectively suppressed, and sufficient abrasion resistance cannot be obtained. . Conversely, the average particle size of the metal flakes is 40
If it exceeds μm, the resin coating containing metal flakes cannot be applied uniformly when the surface of the undercoat coating is applied. More specifically, for example, when coating a metal plate with a roll coater, there is a problem with the coatability of the paint, and metal flakes may be caught between the pick-up roll and the applicator roll and wear each roll. . Further, when coating with a curtain flow coater, the curtain is cut and uniform coating cannot be performed.

The metal flakes of the present invention are not particularly limited in terms of material other than the scale-like substrate, and examples thereof include aluminum, stainless steel, nickel, tin, silver and copper. When the metal flakes are spherical particles of metal powder and have a form of protruding from the surface of the coating film, there is an effect of improving Taber abrasion resistance, but there is no effect of suppressing shearing force generated in the resin coating film. Since the contact area with is also small, the slidability is hindered. Therefore, the metal flakes are preferably scale-like substrates having the effect of suppressing the shearing force of the resin coating film and the slidability. In the present invention, the metal flakes are blended with the matrix resin as described above, and the blending amount of the metal flakes at that time is in the range of 5 to 15 mass% with 100 wt% as a whole. When the content of the metal flakes is less than 5% by mass, for example, when a beverage can of 500 ml is continuously dropped, the number of drops is 700,000 or less and the metal base is exposed due to abrasion, and sufficient abrasion resistance cannot be obtained. . On the contrary, if the content of the metal flakes exceeds 15% by mass, the physical properties of the coating film, such as bending workability and impact workability, deteriorate, which is not preferable.

The matrix resin used in the undercoating paint and the topcoating paint has a baking temperature of P as a whole.
It is appropriately selected so as to be lower than the melting point of TFE. That is, the development of the slidability of the paint according to the present invention is not based on the surface migration of the PTFE fine particles due to melting as in the conventional paint as described above, but the PTFE particles are uniformly melted in the matrix coating film. Because it is due to the existence. Such a matrix resin is a resin whose film-forming temperature is lower than the melting point of PTFE,
And, is not particularly limited as long as it is commonly used as a resin for baking coating, for example, polyester resin, silicon modified polyester resin, linear polymer polyester resin, acrylic resin, epoxy resin,
Polyurethane resin, phenoxy resin, phenol resin,
Examples thereof include polyvinylidene fluoride resin (PVdF) / acrylic resin and vinyl chloride resin.

Various additives known in the art, such as titanium oxide, are added to the resin coating material depending on the purpose of use.
Coloring pigments such as carbon black, chromium oxide and iron oxide powder, extender pigments, chromium-based pigments such as strontium chromate and non-chromium-based anticorrosive pigments such as modified silica and aluminum dihydrogen tripolyphosphate can be added. The resin coating material according to the present invention is a material to be treated, for example, Al.
Plate, cold rolled steel plate, Zn plated steel plate, Al plated steel plate, Zn
-Al alloy-plated steel sheet, Zn-Al-Mg alloy-plated steel sheet, stainless steel sheet and other metal plates can be applied by a usual method, and these metal plates can be treated with phosphate as necessary, A coating type chromate treatment or the like can be applied. Further, in the present invention, since baking can be performed at a temperature lower than the melting point of PTFE, it can be applied to engineering plastics, wood, glass plates, ceramics, etc., in addition to metal plates.

The method of applying the resin coating material according to the present invention will be described below. First, the undercoat paint is applied to the surface of the material to be treated. The coating method at this time is not particularly limited as long as the resin coating can be applied to the material to be treated such as a metal plate, and for example, a known method using a roll coater or a curtain coater can be mentioned. The coating is performed on a metal plate or the like in this manner, and the coating amount at that time varies depending on the composition of the coating material to be coated, the type of material to be coated, the required slidability, etc., but generally the dry thickness is 3 to 15 μm.
Is the range.

Next, the undercoat paint applied to the surface of the material is baked and dried. The baking temperature at this time is PT
It is appropriately selected at a temperature lower than the melting point of FE and higher than the melting point of the matrix resin. Usually, baking is performed by heating the material in an oven for 30 to 120 seconds so that the maximum temperature reaches 180 to 250 ° C. Immediately after baking the coating material according to the present invention, cooling treatment is performed. When treated in this manner, the undercoat coating film of the present invention is formed on the surface of the material which is required to have slidability.

Next, the topcoat paint is applied onto the undercoat coating film formed on the surface of the material to be treated. The coating method at this time is also as described above, and the coating amount is 3 in terms of dry thickness.
The range of -40 μm is common. In this way, the applied topcoat paint is baked and dried on the undercoat coating film formed on the surface of the material whose slidability is to be improved. The baking temperature at this time is appropriately selected at a temperature lower than the melting point of PTFE and higher than the melting point of the matrix resin. Usually, in the oven, the temperature of the material reaches the maximum temperature of 180 to 250 ° C.
Baking is performed by heating for 0 seconds. Immediately after baking the coating material according to the present invention, cooling treatment is performed. When treated in this manner, the top coat film of the paint of the present invention is formed on the surface of the material which is required to have slidability. In the present specification, the application of the coating material for improving slidability according to the present invention to a metal plate has been mainly described, but the resin coating material according to the present invention is not limited to this.
For example, the present invention can be applied to moldings, wood, glass, ceramics, etc. molded from a resin having a melting point higher than the baking temperature of the present invention.

The baking method according to the present invention is not particularly limited to heating in a hot oven. For example, when it is desired to impart slidability to the surface of a material to be treated such as a metal plate of an existing facility or to selectively impart slidability to a specific portion, the resin coating according to the present invention as described above. After applying, heat treatment by contact heat conduction such as iron, iron, heating roller, etc., and then rapidly cooling, without disassembling existing equipment or selectively sliding to specific parts It is possible to impart sex.

The factor that determines the abrasion resistance is the cohesive energy of the resin coating film, and this cohesive energy decreases with increasing temperature not only in polymeric materials but also in all materials. In particular, in a polymer material which is a matrix resin of a resin coating, a material in the glass region at room temperature exceeds the glass transition temperature at the operating temperature, typically 80 ° C,
In some cases, the cohesive energy reaches the rubber region, and the cohesive energy significantly decreases at the glass transition temperature.

According to this aspect of the present invention, the decrease in cohesive energy at the use temperature of the resin coating film is compensated by the high mechanical strength and hardness of the compounded metal flakes to suppress and control the abrasion amount of the coating film. It was found that the abrasion resistance of the coated metal plate heated to the use temperature is enhanced by the method. That is, in this aspect, by mixing 5 to 15 mass% of metal flakes having an average particle size of 10 to 40 μm,
It is possible to improve the wear resistance of a shooter for a vending machine for high temperature storage products. Further, by providing an undercoat coating film containing PTFE particles, it is possible to further improve wear resistance. By using such a slidability and wear resistance improving paint to form a resin coating film on a metal plate in the same manner as in the above-mentioned shooter, sufficient sliding can be achieved even if held in a high temperature environment. It is possible to obtain a shooter that has excellent wear resistance and wear resistance.

[0030]

EXAMPLES (Examples 1 to 6 and Comparative Examples 7 to 12)
The present invention will be described in detail based on examples and comparative examples. However, the invention is not limited to these examples. Plate thickness 0.5 mm, zinc weight per side 45
A coating type chromate treatment is applied to a g / m ² hot-dip galvanized steel sheet, and the undercoating paint and the topcoating paint shown in Table 1 are applied so that the dry film thicknesses are 5 μm and 10 μm, respectively, and shown in Table 1 for 60 seconds. It baked in the hot oven on condition.
20% by mass of the Sr-Cr rust preventive pigment was blended in the undercoat paint, and 10% by mass of carbon black was blended in each of the overcoat paints. Table 1 shows the characteristics of the obtained coated metal plate. In Table 1, bending workability and impact strength are JI.
According to SZ5400 and G3312, the cellophane tape peeling test after 4T bending was performed, and the cellophane tape peeling test after 1 kg × 50 cm impact processing was evaluated. The dynamic friction coefficient was measured with a measuring machine TR type manufactured by Toyo Seiki Seisakusho Co., Ltd. on a target surface: SUS304BA plate.
The coefficient of dynamic friction is 0.2 for a metal plate with excellent slidability.
Must be less than 0.

[0031]

[Table 1]

As is clear from the results shown in Table 1, all of the coated metal sheets according to the present invention (Examples 1 to 6) exhibited good coating appearance, bending workability, impact workability and dynamic friction coefficient.
On the other hand, in Comparative Examples (Comparative Examples 7 to 12) that do not meet the requirements of the present invention, the coating appearance is poor,
An excellent coated metal plate could not be obtained due to poor bending workability and impact workability, and high dynamic friction coefficient.

(Examples 13 to 18 and Comparative Examples 19 to 2)
5) A hot-dip galvanized steel sheet having a plate thickness of 0.8 mm and a weight per unit area of 45 g / m ^{2 on} one side was subjected to coating type chromate treatment, and Table 2
The undercoat paint and the topcoat paint shown in Table 2 were applied so that the dry film thicknesses would be 5 μm and 14 μm, respectively, and under the conditions shown in Table 2, the undercoat paint was for 45 seconds and the topcoat paint was 60 μm.
Bake in a hot oven for a second. In addition, as the undercoating paint, the one containing 20% by mass of the Sr—Cr-based rust preventive pigment was used. Further, both resin paints were blended with 10% by mass of carbon black. The coated metal plate obtained was molded into a vending machine shooter.

Then, 1) a square 500 ml PET bottle and 2) a square 200 on a horizontally arranged shooter.
Place the ml paper pack with the drink mouth facing downward, fix the lower side of the shooter to the test stand, and increase the shooter angle at a speed of 0.5 degree / second with respect to the upper side of the shooter. The angle at which the mold 500 ml PET bottle and the 2) square 200 ml paper pack slid out was measured. This measurement environment has a relative humidity of 65% at 20 ° C. The sliding angle of the product needs to be less than 11 degrees.

In the environment of 80 ° C., the shooter has 3
A 50 ml green tea steel can was continuously dropped 700,000 times to evaluate the abrasion resistance of the coating film at high temperature. A continuous drop test was carried out 700,000 times, and when the base material was not exposed due to abrasion of the coating film, it was evaluated as normal. The results are also shown in Table 2.

[0036]

[Table 2]

As is clear from the results of Table 2, all of the vending machine shooters to which the resin coating film according to the present invention in which metal flakes are mixed in the coating film at 80 ° C. according to this embodiment are applied have excellent sliding properties. And exhibits excellent wear resistance at high temperatures. On the other hand, the vending machine shooter of the comparative example had poor slidability and poor wear resistance at high temperatures.

[0038]

As described above, according to the present invention, a resin having a film formation temperature lower than the melting point of PTFE is used as a matrix resin, and a specific amount of PTFE having a specific particle diameter is used in a specific amount for an undercoat paint and an overcoat. It is a paint for improving the slidability and abrasion resistance of the surface of the material, which is blended in the coating material for the coating and a specific amount of metal flakes in the coating material for the coating material. Is a paint that is evenly distributed in a state of being buried substantially parallel to the material to be treated, and is evenly dispersed in a state where the PTFE particles are partially exposed without melting, and thus exhibit high slidability. It is excellent in that it can be manufactured at low cost, it can be baked and coated using existing equipment, and that the obtained coated product can maintain slidability until just before the coating film wears and disappears. Produce an effect. Further, according to the present invention, it is possible to obtain a shooter excellent in slidability and wear resistance even at high temperatures. Therefore,
It is possible to provide a shooter having a desired property depending on the use situation.

[Brief description of drawings]

FIG. 1 is a sectional view showing the concept of developing slidability according to the present invention.

FIG. 2 is a cross-sectional view showing the concept of developing slidability by a conventional method.

[Explanation of symbols]

1. ． ． PTFE particles 2. ． ． Top coat film 3. ． ． Metal flakes 4. ． ． Undercoat film 5. ． ． Material (metal plate) 6. ． ． PTFE layer

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) B32B 15/08 B32B 15/08 G C09D 127/18 C09D 127/18 201/00 201/00 G07F 9/00 109 G07F 9/00 109F (72) Inventor Koji Mori 1st day at No. 7 Takatani Shinmachi, Ichikawa City, Chiba Prefecture Nisshin Steel Co., Ltd. Technical Research Institute F term (reference) 3E044 AA01 FB01 FB08 4D075 BB28Z CA02 CA09 CA13 CA48 DA06 DB01 DC15 EA07 EA10 EA19 EB13 EB16 EB53 EB56 EB57 EC10 EC23 4F100 AB01B AB01C AB03 AB18 AK01A AK01B AK18A AK18B AK41 AK51 AK53 AT00C BA03 BA07 BA10B BA10C CA15 CC00A CC00B DE01A DE01B DE02B EH46 EH46A EH46B EH71 EJ48 EJ48B EJ65A JA04A JA04B JK06 JK09 JK16 JL01 JL02 YY00A YY00B 4J038 CD121 PA07

Claims (5)

[Claims] 1. A matrix resin having a film formation temperature lower than the melting point of polytetrafluoroethylene resin of 95 to 60 mass% and an average particle diameter of 2 to 15 μm on the surface of a material to be treated.
m of the polytetrafluoroethylene resin of 5 to 40% by mass as a main component to form a film with an undercoating coating material, and on the coating film,
A matrix resin having a film forming temperature lower than the melting point of the polytetrafluoroethylene resin 90 to 45% by mass, an unmelted polytetrafluoroethylene resin having an average particle size of 2 to 40 μm 5 to 40% by mass, and an average particle size of 10 -40 μm metal flake-like substrate 5 to 15% by mass is applied as a main component, and the top coating is applied, and the temperature is lower than the melting point of the polytetrafluoroethylene resin and higher than the film forming temperature of the matrix resin. A coated article having high slidability obtained by 2. A matrix resin having a film forming temperature on the surface of a material to be treated which is lower than the melting point of the polytetrafluoroethylene resin in an amount of 95 to 60% by mass and an average particle diameter of 2 to 15 μm.
m of the polytetrafluoroethylene resin of 5 to 40% by mass as a main component to form a film with an undercoating coating material, and on the coating film,
A matrix resin having a film forming temperature lower than the melting point of the polytetrafluoroethylene resin 90 to 45% by mass, an unmelted polytetrafluoroethylene resin having an average particle size of 2 to 40 μm 5 to 40% by mass, and an average particle size of 10 -40 μm metal flake-like substrate 5 to 15% by mass is applied as a main component, and the top coating is applied, and the temperature is lower than the melting point of the polytetrafluoroethylene resin and higher than the film forming temperature of the matrix resin. In the top coating film formed by the above, the metal flake-like substrate is uniformly dispersed in a state of being buried substantially parallel to the material to be treated, and some of the particles of the unmelted polytetrafluoroethylene resin are A coated article having a high slidability provided with a coating film, which is characterized by being uniformly dispersed in the coating film in a state of being exposed from the surface of the coating film. 3. The coated article having high slidability according to claim 1 or 2, wherein the material is a metal. 4. In a shooter for a vending machine, which comprises a resin coating containing a polytetrafluoroethylene resin on the surface of a metal plate, the film forming temperature on the surface of the material is higher than the melting point of the polytetrafluoroethylene resin. Low matrix resin 95-60 mass% and average particle size 2-15μ
m of the polytetrafluoroethylene resin of 5 to 40 mass% is used as a main component to form a film for undercoating, and a film is formed on the coating film.
A matrix resin having a film forming temperature lower than the melting point of the polytetrafluoroethylene resin 90 to 45% by mass, an unmelted polytetrafluoroethylene resin having an average particle size of 2 to 40 μm 5 to 40% by mass, and an average particle size of 10 -40 μm metal flake-like substrate 5 to 15% by mass is applied as a main component, and the top coating is applied, and the temperature is lower than the melting point of the polytetrafluoroethylene resin and higher than the film forming temperature of the matrix resin. In the top coating film formed by the above, the metal flake-like substrate is uniformly dispersed in a state of being buried substantially parallel to the material to be treated, and some of the particles of the unmelted polytetrafluoroethylene resin are It is evenly dispersed in the coating film while being exposed from the coating film surface, and the metal flaky base compounded in the resin coating film suppresses / controls the abrasion of the resin coating film at the operating temperature. A shooter for a vending machine, characterized by being controlled. 5. An automatic vending machine provided with a shooter for the automatic vending machine according to claim 4.