JP5707578B2 - Fluorine coating structure, coating object thereof and coating method thereof - Google Patents

Description

The present invention relates to a fluorine coating method , and more particularly, to a coating processing technique in which a fluorine film having a film thickness of nanometer level is applied to the surface of an object made of a base material such as metal, glass, plastic, or rubber.

  In general, for industrial knives and tools including punching dies, die cutting dies, cutting knives, etc., in order to improve the sharpness by reducing the cutting resistance and to maintain the sharpness for a long time, In order to prevent adhesion, characteristics such as a low coefficient of friction, non-adhesiveness, water repellency and oil repellency are required.

  In order to impart these properties, conventionally, for example, the surface of the blade has been subjected to a coating treatment such as applying various resin coatings. Among them, the coating treatment with a fluororesin coating imparts the properties required for the surface of the blade. It was very good in that it did.

  However, in the conventional fluororesin coating method, due to the high non-adhesiveness of the fluororesin, the adhesion to the blade surface is poor and the adhesion strength is weak, and it peels off after a relatively short period of use. There was a problem with sex. In addition, it is difficult to reduce the film thickness of the fluororesin film, and it is impossible to coat the blade edge of the blade, and the desired characteristics cannot be imparted.

  These problems include other blades for meat processing having sharp edges and tips, various blades such as kitchen knives, various needles such as injection needles and sewing needles, or gears having sliding contact portions and sliding portions. It was a problem common to machine elements and machine parts.

  In this regard, for example, as disclosed in Patent Document 1, a coating method of a chemisorbed monomolecular film that has excellent peel resistance and can obtain a film thickness on the nanometer order has been proposed.

  However, this coating method is to form a chemisorbed monomolecular film containing fluorine having a film thickness of nanometer level on the surface of the blade by chemical bonding with the blade (base material). There are problems such as the generation of hydrochloric acid gas from time to time, and there is a need to solve these problems in practice. Also, large industrial equipment is required, the equipment cost is high, and it is suitable for mass production. Not suitable for low-volume production of varieties.

JP-A-4-239635

The present invention has been made in view of such conventional problems, and its object is to apply a fluorine film having a thickness of 1 μm or less on the surface of a substrate such as metal, glass, plastic, rubber or the like. It is to provide a fluorine coating method .

In order to achieve this object, the fluorine coating method of the present invention is a coating method for forming a fluorine film having a film thickness of 1 μm or less on the surface of a substrate, wherein the primer coating forms a primer layer on the surface of the substrate. And a fluorine coating step for forming a fluorine layer on the surface of the primer layer formed by the primer coating step, and in the fluorine coating step, a fluorine coating agent having a monomolecular structure is formed on the primer layer surface. It is characterized by being dried by being left in an atmosphere of 40 to 80% humidity and a temperature of 80 to 98 ° C. for 60 to 480 minutes .

  Here, the “fluorine coating” is a term for a fluororesin coating (fluorine component ratio of about 8 to 35%) made of a fluororesin, which is a general term for synthetic resins obtained by polymerizing fluorine-containing olefins. Pure fluorine coating (fluorine component ratio is 98% or more) formed by chemical bonding on the substrate surface by applying a fluorine coating agent comprising pure fluorine of molecular structure to the substrate surface and drying it. (Hereinafter the same applies throughout the present specification and claims).

The following configuration is adopted as a preferred embodiment.
(1) In the fluorine coating step, a fluorine coating agent having a monomolecular structure is applied to the surface of the primer layer, and left in an atmosphere of humidity 40 to 80% and temperature 80 to 98 ° C. for 60 to 480 minutes. At least one fluorine intermediate coating step for forming an intermediate layer, and a fluorine coating agent having a monomolecular structure is applied to the surface of the fluorine intermediate layer, and the humidity is 40 to 80% and the temperature is 80 to 98 ° C. And a fluorine finish coating step in which a fluorine finish layer is formed by being left for 480 minutes.

(2) In the primer coating step, a primer coating agent prepared so that the film thickness during film formation is 1 μm or less is applied to the surface of the base material, and the humidity is 40 to 90% and the temperature is 20 to 120 ° C. In the atmosphere of 40 to 60 minutes to dry.

(3) The primer coating step is performed at the substrate surface temperature of 20 to 98 ° C.

(4) The fluorine layer is a polytetrafluoroethylene monomolecular layer formed by chemical bonding on the surface of the primer layer.

(5) The primer layer is a glass coating layer formed on the substrate surface by chemical bonding.

  The present invention has been realized by employing fluorine having a single molecular structure that has been researched and developed in recent years (for example, see Patent Document 1).

The fluorine coating method of the present invention comprises a primer coating step for forming a primer layer on the surface of the substrate, and a fluorine coating step for forming a fluorine layer on the surface of the primer layer formed by this primer coating step, In the above-mentioned fluorine coating process, a fluorine coating agent having a monomolecular structure is applied to the surface of the primer layer and left to dry for 60 to 480 minutes in an atmosphere having a humidity of 40 to 80% and a temperature of 80 to 98 ° C. Since a fluorine film (fluorine coating structure) having a film thickness of nanometer level, that is, 1 μm or less is formed on the surface of the base material, it has been difficult to reduce the film thickness of the fluorine film and coating is impossible. applicability fluorine coating structure to the cutting edge and the needle tip, such as a sharp blade or needle has been In, it can be coated with fluorine coating until the needle tip of the tool cutting edge and a needle.

In the fluorine coating step, a fluorine coating agent having a monomolecular structure is applied to the surface of the primer layer, and is left to dry for 60 to 480 minutes in an atmosphere having a humidity of 40 to 80% and a temperature of 80 to 98 ° C. Thus, the fluorine coating structure can be formed safely without generating harmful gases (not including the hazardous substances of the RoHS Directive and REACH regulations as environmental countermeasure standards and regulations). In particular, by subjecting the applied fluorine coating agent to a drying treatment at a low temperature of 80 to 98 ° C., there is no adverse effect on the dimensional accuracy in an industrial blade that requires precise dimensional accuracy.

Furthermore, when carrying out the above-described fluorine coating method, large-scale industrial equipment is not required, equipment costs can be reduced, a fluorine coating structure with low manufacturing costs can be provided, and the product cost is low. A fluorine-coated object can be provided, and it can be suitably used for small-lot production of various varieties that are difficult to produce in large quantities by industrialization.

Further, according to the fluorine-coated object obtained by carrying out the fluorine coating method, the surface of the object made of a base material such as metal, glass, plastic, or rubber is provided with the fluorine film (fluorine coating structure), so that it is sharp. It is possible to produce a fluorine-coated object having characteristics such as sharpness required for the surface of the blade or the tip of the needle and a reduction in insertion resistance. In particular, it is not only excellent in sharpness but also effective in long-term use in industrial knives such as punching dies and die-cutting dies that require strong surface characteristics such as low friction coefficient, non-adhesiveness, water repellency and oil repellency. Long-life products that can be kept

It is front sectional drawing which expands and shows typically the fluorine coating structure which is one Embodiment of this invention. It is a process block diagram for demonstrating the fluorine coating method which manufactures the same fluorine coating structure. 3A to 3D are front cross-sectional views schematically showing the state of the substrate surface in each step of the fluorine coating method. 4A and 4B are front cross-sectional views schematically illustrating an industrial blade that is an example of a fluorine-coated object having the same fluorine-coated structure at the blade edge.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Throughout the drawings, the same reference numeral indicates the same component or element.

  A fluorine coating structure according to the present invention is shown in FIG. 1, and this fluorine coating structure 1 constitutes the surface of an object that is required to have water repellency, oil repellency, non-adhesion, and antifouling properties. For example, FIG. ) And (b) are suitably employed for the cutting edge of an industrial blade having a sharp cutting edge.

  FIG. 4 (a) shows the punched state of the workpiece W by the punching die 2, and the surface portion including the die 2a and the cutting edge of the punch 2b that punches the workpiece W supported on the die 2a. The above-mentioned fluorine coating structure 1 (fluorine coating) is adopted in (a part indicated by a dashed line). FIG. 4B shows the state of the workpiece W being punched by the punching die 3, and includes the cutting edge of the punching blade 3b that performs the punching operation on the workpiece W supported on the die 3a. The fluorine coating structure 1 (fluorine coating) is employed on the surface portion (the portion indicated by the dashed-dotted line).

  Although not specifically shown, the pointed surface of the cutting edge does not have the fluorine coating structure 1 (fluorine coating) and is directly exposed to the outside. This is to ensure the initial sharpness for the workpiece W, which is the original function of the cutting edge. However, according to the fluorine coating method described later, the fluorine coating agent (liquid paint) has a low viscosity. When it is applied, it is not applied to the tip surface due to its surface tension, and therefore no fluorine coating is formed.

  Specifically, as shown in FIG. 1, the fluorine coating structure 1 is formed by forming a fluorine film 6 having a film thickness t of nanometer level (1 μm or less) on the surface of a base material 5 constituting an object. In the fluorine coating 6 of the illustrated embodiment, the film thickness t is set to an average of 500 nm. In addition, FIG. 1 is drawn schematically with a focus on explaining the cross-sectional configuration of the fluorine coating 6, and the actual cross-sectional configuration is not clear as shown in the figure, and the boundary line is strictly not shown. It is not a straight line.

  Examples of the constituent material of the base material 5 include metal, glass, plastic, rubber, and the like. In the illustrated embodiment, the base material 5 is made of a metal such as a cemented carbide constituting the industrial blades 2 and 3 shown in FIG. .

  Specifically, the fluorine coating 6 has a two-layer structure composed of a primer layer 6a and a fluorine layer 6b as a surface layer, and is firmly formed on the surface 5a of the substrate 5 by chemical bonding. With such a two-layer structure, it is possible to form the fluorine coating 6 on a site where it has been difficult to reduce the film thickness and coating is impossible. As will be described later, the fluorine layer 6b is formed in a single monomolecular layer through a plurality of fluorine coating steps (at least one fluorine intermediate coating step and a fluorine finish coating step) in which the same fluorine coating agent continues. It is what is done.

  The primer layer 6a is in the form of a thin film that forms the base layer of the fluorine coating 6, and specifically, is for forming the fluorine layer 6b on the surface 5a of the substrate 5 by a chemical bonding action. For this purpose, the primer layer 6a is made of a chemical component that is easily chemically bonded to the constituent material of the base material 5 to be coated with fluorine and is also easily chemically bonded to the constituent material of the fluorine layer 6b. In the form, the glass primer coating agent is formed of a glass coating layer formed by chemical bonding on the surface 5a of the base material 5 as will be described later.

  The fluorine layer 6b is a thin film that forms the surface layer of the fluorine coating 6, and specifically, is chemically adsorbed on the surface 5a of the substrate 5 through the primer layer 6a. is there. For this purpose, the fluorine layer 6b is made of fluorine having a monomolecular structure that is easily chemically bonded to the constituent material of the primer layer 6a. In the illustrated embodiment, polytetrafluoroethylene ( PTFE) A coating agent is composed of a monomolecular layer of PTFE formed by chemical bonding on the surface of the primer layer 6a.

  Then, the formation method (fluorine coating method) of the fluorine structure 1 comprised as mentioned above is demonstrated (refer FIG. 2).

  As shown in FIG. 2, the fluorine coating method of this embodiment includes (1) a cleaning process, (2) a degreasing process, (3) a primer coating process, (4) a fluorine intermediate coating process, and (5) a fluorine finish. The coating process and the (6) rust prevention treatment process are basically used. This will be described in the following order.

(1) Cleaning process :
In this step, the surface 5a of the existing article (object, substrate) 5 is adhered to the surface 5a of the article 5 to be subjected to fluorine coating, such as when the fluorine coating of this embodiment, more specifically, the primer coating is applied. This is performed when there is a lot of dirt and maintenance is required to remove the dirt. For example, in the case where punching residue or adhesive remains on the surface of the punching die 2 or the punching die 3 as shown in FIGS. 4A and 4B, it is performed as an essential processing step.

i) A water-based cleaning agent (for example, “Torita” manufactured by Shin Nippon Tech Co., Ltd.) is sprayed on the surface 5a of the object 5 and allowed to acclimate as it is for about 10 minutes.

ii) After the surface of the object 5 is steam cleaned with a steam cleaner (steam cleaner), dirt on the surface 5a is removed with a cleaning tool such as bamboo comb. In this case, the cleaning effect is doubled by spraying alcohol before the steam cleaning.

iii) The above operations i) and ii) are repeated a plurality of times (for example, 2 to 3 times), and it is visually confirmed that the surface 5a of the object 5 has been completely cleaned and removed. If there is rust, remove with a metal polishing abrasive (for example, “Pical” manufactured by Nippon Abrasives Co., Ltd.) or fine sandpaper (number 1000 or higher).

iv) The object 5 that has been cleaned is dried with warm air by a drying means such as a drying furnace or a dryer.

v) A portion of the surface 5a of the object 5 which is not subjected to fluorine coating is lightly wiped with a cloth containing a rust inhibitor and subjected to rust prevention treatment, and masking is performed as necessary. In particular, in the case where the base material 5 constituting the object is an iron-based material having a low hardness, rust prevention treatment is essential because there is a risk of rusting in the subsequent steps.

(2) Degreasing process :
This step is performed in order to remove the primer coating agent for forming the primer layer 6a and the fluorine coating agent for forming the fluorine layer 6b in the subsequent step because they are extremely disliked with dirt, moisture and oil.

i) Using fluorine, thinner thinning solution, or the like, the fluorine coating portion on the surface 5a of the object 5 is reliably degreased in detail.

ii) Dry with warm air by a drying means such as a drying furnace or a drier for a predetermined time (in the illustrated embodiment, about 10 minutes) to ensure that the fluorine coating portion is dried (FIG. 3A). If the fluorine coating site is not dry, the primer coating agent does not adhere to the fluorine coating site in the next primer coating step.

(3) Primer coating process :
As described above, this step is for forming the primer layer 6a for adsorbing the base material 5 of the object and the fluorine layer 6b by a chemical bonding action.

  The primer coating agent itself used for forming the primer layer 6a is liquid glass (glass-based primer coating agent), specifically, the main components are composed of silicon (Si), nitrogen (N), and hydrogen (H). The primer layer 6a is bonded to the substrate 5 of the object by chemical bonding.

  In addition, this primer coating agent is more easily chemically bonded when the workpiece surface 5a is in an active state by heating. However, since this step is performed continuously after the degreasing drying in the previous step, It is carried out at a temperature (substrate surface temperature) of 20 to 98 ° C. (in the illustrated embodiment, it is carried out in a state heated to 50 to 80 ° C.).

  Here, the temperature of the workpiece surface 5a (base material surface temperature) is set to 20 to 98 ° C. If the substrate surface temperature is lower than 20 ° C., water droplets adhere to the surface of the base material. This is because there is a problem that the surface of the material is not activated, and when it is higher than 98 ° C., there is a problem that the solvent of the primer coating agent is volatilized rapidly and coating unevenness occurs.

i) The above primer coating agent (for example, “Perhydrod” manufactured by AZ Electronic Materials Co., Ltd.) prepared so that the film thickness at the time of film formation is on the nanometer level (350 to 500 nm in the illustrated embodiment). "Perhydropolysilazane" (trade name "AQUAMICATM") is applied to the extent that the fluorine coating part of the surface (metal surface) 5a of the substrate 5 is wetted. It is desirable to apply as much as possible.

ii) The object 5 to which the primer coating agent is applied is 40 to 90% in an atmosphere having a humidity of 40 to 90% (40% or more in the illustrated embodiment) and a temperature of 20 to 120 ° C. (92 ° C. in the illustrated embodiment). The primer layer 6a is formed (fired) by being left to dry for 60 minutes (40 minutes in the illustrated embodiment) (FIG. 3B). The primer coating agent forms a primer layer (film) 6a that is strongly chemically bonded by the temperature and humidity of the dry atmosphere.

  Here, when the humidity is set to 40 to 90%, if it is lower than 40%, the chemical bonding of the primer coating agent to the substrate 5 is not completed within a predetermined time, and it takes an excessive amount of time. This is because there is the above problem, and when it is higher than 90%, there is a problem that water droplets adhere to the substrate surface. When the temperature is set to 20 to 120 ° C., the temperature of the substrate is not activated when the temperature is lower than 20 ° C., and when the temperature is higher than 120 ° C., the solvent of the primer coating agent is volatilized rapidly. This is because there is a problem that uneven coating occurs. In addition, if the drying treatment time is set to 40 to 60 minutes, if it is shorter than 40 minutes, there is a problem that the chemical bonding of the primer coating agent to the substrate 5 is not sufficiently performed, and it is longer than 60 minutes. This is because production efficiency falls and there are practical problems.

  In the illustrated embodiment, the object 5 to which the primer coating agent has been applied is placed in a chamber of a constant temperature and humidity device and left at a setting of 92 ° C. for 40 minutes. In this case, the humidity in the storage is set to be within 60%, that is, within a range of 40 to 60%.

  By the way, if the humidity in the cabinet is set to be higher than 60%, the base material 5 is made of metal, so that the surface of the base material is condensed and the primer coat agent is not sufficiently chemically bonded. 5 causes rusting.

  In the treatment process under such conditions, since the solvent volatilization (drying) time of the primer coating agent is short (several seconds), almost no foreign matter is mixed into the formed primer layer (thin film) 6a.

  In addition, the temperature (drying temperature) of 20 to 120 ° C. (92 ° C. in the illustrated embodiment) of the drying atmosphere in the chamber of the constant temperature and humidity device is set in consideration of the temperature drop when the chamber is opened and closed. With such a temperature setting, the primer coating agent that is the undiluted coating solution on the surface of the substrate 5 is obtained, for example, for drying the surface of the primer layer 6a regardless of the basic drying process conditions of 80 ° C. for 40 minutes (that is, regardless of the opening and closing of the interior). The object (base material) 5 that is the object can be treated at 98 ° C. or less, for example. Moreover, since the drying temperature is equal to or lower than the boiling point of water, the humidity due to the water in the container for humidification can realize a moderate humidity (assumed humidity).

iii) If necessary, as a treatment after drying, the unevenness (pattern) of the primer layer 6a is wiped with a soft cloth or tissue.

  That is, in the case of the illustrated embodiment, the primer layer 6a itself is a thin film of 350 to 450 nm as the primer coating agent, but the primer coating agent that is applied more is attached as rainbow spots (Newton ring shape). There is. In order to remove this unevenness (pattern) portion, the wiping can be performed to realize a primer layer 6a (film thickness of 350 to 450 nm) as a uniform underlayer.

  The uneven portion of the primer coating agent is removed by performing the wiping, because the primer layer 6a is a monomolecular film formed by chemical bonding, due to the characteristics of the primer coating agent of the present embodiment. This is because the film thickness does not become thicker than the film thickness (350 to 500 nm in the illustrated embodiment) that is set and adjusted in advance.

(4) Fluorine intermediate coating process :
This step is for forming a fluorine intermediate layer 6b having a monomolecular structure on the surface 5a of the object with the primer layer 6a as an intermediary. Specifically, at least one surface of the primer layer 6a has at least one surface. This is for forming the fluorine intermediate layer 6b (one layer in the illustrated embodiment) by chemical bonding.

  The fluorine coating agent used for forming the fluorine layer 6b is more likely to chemically bond with the base (glass) surface when the primer layer 6a, which is the surface of the workpiece 5, is in an activated state when heated. The process is performed at a surface of the object to be processed after the primer coating process of the previous process, that is, the surface temperature of the primer layer 6a at 20 to 140 ° C. (in the illustrated embodiment, the surface temperature is 20 to 80 ° C.). )

  Here, the temperature of the workpiece surface 6a (primer layer surface temperature) is maintained at 20 to 140 ° C. If the temperature is lower than 20 ° C., there is a problem that the surface of the primer layer 6a is not activated. If it is higher, the solvent of the fluorine coating agent volatilizes rapidly, and there is a problem that chemical bonding of the fluorine coating agent to the primer layer 6a is not performed purely.

i) Fluorine coating agent having a monomolecular structure, which is prepared and set so that the solvent volatilization temperature is a predetermined temperature (145 ° C. in the illustrated embodiment), specifically, polytetrafluoroethylene (PTFE) having a monomolecular structure A coating agent (for example, “Fluorosurf” (trade name) manufactured by Fluoro Technology Co., Ltd.) is applied to such an extent that the fluorine coating portion on the surface of the primer layer 6a is wetted.

  Setting and adjusting the solvent volatilization temperature of the fluorine coating agent to be the above-mentioned predetermined temperature prevents rapid drying of the fluorine coating agent, thereby averaging the monomolecular fluorine coating (fluorine intermediate layer) 6b. This is for forming a thin film.

ii) The object 5 to which the fluorine coating agent is applied is placed in an atmosphere at a humidity of 40 to 80% (more desirably 60 to 70%) and a temperature of 20 to 140 ° C. (more desirably 80 to 98 ° C.) for 60 to 480 minutes ( More desirably, it is allowed to stand for 60 to 70 minutes (set and adjusted in accordance with the temperature)) and dried to form (fire) the fluorine intermediate layer 6b (FIG. 3C). The fluorine coating agent forms a fluorine layer (coating) 6b that is firmly adhered by the temperature and humidity of the dry atmosphere.

  When the humidity is set to 40 to 80%, the surface of the primer layer 6a is not activated when the humidity is lower than 40%. When the humidity is higher than 80%, water droplets are formed on the surface of the primer layer 6a. This is because there is a problem that the deposition of the fluorine intermediate layer 6b is hindered. When the temperature is set to 20 to 140 ° C, the temperature of the primer layer 6a is not activated when the temperature is lower than 20 ° C. When the temperature is higher than 140 ° C, the solvent of the fluorine coating agent is volatilized rapidly. This is because the uniform fluorine intermediate layer 6b is not formed. In addition, when the drying treatment time is set to 60 to 480 minutes, if it is shorter than 60 minutes, chemical bonding of the fluorine coating agent to the primer layer 6a is not sufficiently performed, and the fluorine intermediate layer 6b is not completely formed. Also, if it is longer than 480 minutes, the production efficiency is lowered and there is a practical problem.

  The temperature of the drying atmosphere (drying temperature) of 20 to 140 ° C. (92 ° C. in the illustrated embodiment) is set in consideration of the temperature rise error in the chamber of the constant temperature and humidity device and the temperature drop when the door is opened and closed. Is done. By such temperature setting, the fluorine coating agent which is the coating solution on the surface of the primer layer 6a can be used for, for example, drying the surface of the fluorine intermediate layer 6b regardless of the basic drying process conditions of 80 ° C. to 60 minutes (that is, regardless of opening / closing in the chamber). The required process conditions) can be strictly observed, and the object (base material) 5 that is the object can be treated at 98 ° C. or lower, for example. Moreover, since the drying temperature is equal to or lower than the boiling point of water, the humidity due to the water in the container for humidification can realize a moderate humidity (assumed humidity).

  Moreover, since the solvent volatilization temperature of the fluorine coating agent is set at 145 ° C. as described above, the fluorine coating agent does not dry rapidly, and as a result, the monomolecular fluorine coating (fluorine intermediate layer) 6b is averaged. It can be formed as a thin film (film thickness of 35 to 55 nm in the illustrated embodiment).

(5) Fluorine finish coating process :
This step is performed in order to increase the density of the finally formed fluorine film and to give the desired characteristics to the surface 5a of the object 5, and specifically, the fluorine intermediate coating step (4) above. Perform exactly the same process.

  In other words, since the fluorine coating is a monomolecular thin film as described above, the entire thin film is formed in a madder state by one coating (see FIG. 3C), and two or more coatings are performed. In this way, the spotted state becomes dense, and the characteristics of the original fluorine film can be expressed. In order to impart the desired fluorine coating characteristics to the surface of the primer layer 6a, the fluorine coating process of (4) above. In addition, the fluorine layer 6b having a monomolecular layer is formed at least a plurality of times (in the illustrated embodiment, twice), and the final fluorine coating step is the fluorine finish coating step.

  In addition, in the cleaning process step (1) above, if masking is applied to a portion not subjected to fluorine coating, it is peeled off before starting the drying process (baking process) in the second fluorine coating process (heating for a long time) To prevent the masking member from becoming difficult to peel off.)

(6) Rust prevention treatment process :
This step is performed in order to prevent the surface portion of the object 5 that has not been subjected to the fluorine coating from rusting over time due to the implementation of the degreasing treatment step.

  Specifically, a portion of the object surface 5a where the fluorine coating (fluorine coating structure) 1 exists is wiped with a cloth lightly containing a rust preventive agent and subjected to a rust prevention treatment.

  Thus, according to the fluorine structure 1 configured as described above, the film thickness t () at the nanometer level is formed on the surface 5a of the base material 5 of metal, glass, plastic, rubber or the like (metal in the illustrated embodiment). In the illustrated embodiment, since the fluorine coating 6 (6a, 6qb) having an average of 500 nm) is formed by chemical bonding, it has been conventionally difficult to reduce the thickness of the fluororesin coating, and coating is impossible. It can also be applied to sharp edges and sharp edges such as sharp edges and needles, such as the edges of industrial blades 2 and 3 shown in FIG. 4, and the fluorine coating 6 is applied to the edge of the edge and the needle edge of the needle. Can do.

  That is, according to the fluorine structure 1 of the present embodiment, compared with the conventional general fluororesin coating, (ii) the bonding form of the fluorine film 6 to the base material 5 is a chemical bond (ii) The base material 5 to be coated is not limited to a metal such as an iron-based metal, and almost all base materials such as glass, plastic and rubber can be applied, and any base material (material) to be coated can be selected. No blast treatment as a treatment is required, and the surface of the substrate 5 is not roughened. (Iv) The film thickness to be formed is a nanometer level of 1 μm or less. (V) The treatment temperature is 98 ° C. or less. It is possible, and (vi) the fluorine component ratio is 98% or more with respect to the conventional 8-35%.

  By providing the fluorine structure 1, for example, as shown in FIG. 1, the surface of a sharp blade or the tip of a needle is included, including surface characteristics such as repelling a water droplet A or repelling dirt B such as an adhesive. It is possible to produce a fluorine-coated object having surface characteristics such as sharpness and reduced insertion resistance that are particularly required. In particular, for example, industrial blades 2 and 3 shown in FIG. 4, sharpness and sharpness particularly required for the surface of the tip portion of the needle and the sharpness and characteristics such as reduced insertion resistance are excellent. In addition, it is possible to provide a long-life product that can maintain its sharpness effectively over a long period of time.

  Further, according to the fluorine coating method of the present embodiment described above, in the fluorine coating step of forming the fluorine layer 6b on the surface of the primer layer 6a formed by the primer coating step, the surface of the primer layer 6a has a monomolecular structure. The fluorine coating agent is applied and left to dry for 30 to 480 minutes in an atmosphere having a humidity of 40 to 80% and a temperature of 20 to 140 ° C. Therefore, the fluorine coating structure 1 does not generate harmful gas. (Does not include RoHS directives as environmental countermeasure standards / regulations and REACH toxic substances). In particular, the applied fluorine coating agent is dried at a low temperature of 98 ° C. to adversely affect the dimensional accuracy of the industrial blades required for precise dimensional accuracy, such as the industrial blades 2 and 3 shown in FIG. Never give.

  Moreover, when carrying out the above-described fluorine coating method, a large-scale industrial facility that is required for the conventional general fluororesin coating technology is not required, the facility cost can be reduced, and the fluorine coating structure having a low manufacturing cost. As a result, it is possible to provide a fluorine-coated article having a low product cost, and it can be suitably used for low-volume production of various varieties that are difficult to produce automatically in large quantities by industrialization.

  Furthermore, the test result performed about the specific application example of the fluorine structure 1 which concerns on this embodiment is enumerated below.

(1) When the special adhesive film is cut by applying the fluorine coating of this embodiment on the surface of the cutting edge of the special scissors installed in the film punching machine, the service life is about 400,000 times without the conventional coating. However, it was found that it can be continuously used 2.25 million times.

(2) At least 80,000 shots of the PET base double-layer adhesive sheet half-cut by the half-cut pinnacle blade to which the fluorine coating of the present embodiment is applied, which was 3000 shots without the conventional coating. It has been found that the life is extended more than shots (lot production end).

(3) At least 50,000 shots of continuous processing of the pressure-sensitive adhesive sheet of the press combination mold to which the fluorine coating of this embodiment is applied. Middle) was found to be possible.

(4) At least 250,000 shots of the special fiber (carbon, aramid) weaving scissors blades for looms applied with the fluorine coating of the present embodiment, which were 15,000 shots without conventional coating. It was found that continuous machining (currently in continuous use) is possible.

(5) In the Thomson die cutting of the extremely thick adhesive layer sheet to which the fluorine coating of this embodiment is applied, what was 300 shots in the case of no conventional coating is 5,000 shots continuous processing (end of lot production) It turned out to be possible.

(6) In the application test of the fluorine coating of the present embodiment to the metal or resin roller under the condition where the adhesive is handled, a long-time maintenance is required every few days before the conventional application. After that, it became possible to use it for a week or more with only simple wiping, and it was found that the maintenance is remarkably facilitated. Although the endurance test is still ongoing at the time of this application, there are no external factors other than adhesives, and the limit is still not visible.

(7) In the application test to the powder molding die to which the fluorine coating of the present embodiment is applied, the stability of the mold release / demolding coating from the mold utilizing the slipperiness is improved, and the fluorine coating of the present embodiment is also applied. In application tests to applied resin molds and related parts, it has been confirmed experimentally that mold release is improved and product dimensions are stable.

(8) By applying the coating according to the present embodiment, a molded product of a medical part having a fine shape has a very poor production efficiency because a mold release agent cannot be used conventionally. However, it has been found that production is possible with a standard molding cycle, quality is stable, and productivity is improved by a factor of 5 compared to the conventional one.

  The above-described embodiment is merely a preferred embodiment of the present invention, and the present invention is not limited thereto, and various design changes can be made within the scope.

  For example, the present invention includes the above-mentioned industrial blades 2 and 3, various types of blades such as scissors for general use, knives, cutters, blades for meat processing, cooking knives, surgical tools, acupuncture tools, sewing tools, etc. The present invention can be suitably applied to articles (objects) having sharp tip portions, sliding contact portions, and sliding portions, such as various needles or mechanical elements such as gears and machine parts.

  Further, as described above, as a constituent material of the base material 5, glass, plastic, rubber, etc. can be adopted in addition to the metal as in the illustrated embodiment due to the presence of the primer layer 6 a formed by chemical bonding. is there.

1 Fluorine coating structure 5 Base material (object)
5a Substrate surface t Nanometer level film thickness 6 Fluorine coating 6a Primer layer 6b Fluorine layer

Claims (6)

A coating method for forming a fluorine film having a film thickness of 1 μm or less on a substrate surface ,
A primer coating step for forming a primer layer on the surface of the base material, and a fluorine coating step for forming a fluorine layer on the surface of the primer layer formed by the primer coating step,
In the fluorine coating step, applying a monomolecular fluorine coating agent to the surface of the primer layer and leaving it to dry for 60 to 480 minutes in an atmosphere of humidity 40 to 80% and temperature 80 to 98 ° C. Fluorine coating method characterized. In the fluorine coating step, a fluorine coating agent having a monomolecular structure is applied to the surface of the primer layer and left in an atmosphere of humidity 40 to 80% and temperature 80 to 98 ° C. for 60 to 480 minutes to form a fluorine intermediate layer. At least one fluorine intermediate coating step to be formed, and a fluorine coating agent having a monomolecular structure is applied to the surface of the fluorine intermediate layer, and left for 60 to 480 minutes in an atmosphere having a humidity of 40 to 80% and a temperature of 80 to 98 ° C. The fluorine coating method according to claim 1 , further comprising a fluorine finish coating step for forming a fluorine finish layer. In the primer coating step, a primer coating agent prepared so that the film thickness at the time of film formation is 1 μm or less is applied to the surface of the base material in an atmosphere of humidity 40 to 90% and temperature 20 to 120 ° C. in the fluorine coating process according to claim 1 or 2, characterized in that left dried 40-60 minutes. The fluorine coating method according to claim 3 , wherein the primer coating step is performed at a substrate surface temperature of 20 to 98 ° C. 5. The fluorine layer is a fluorine coating method according to any one of claims 1 to 4, characterized in that the primer layer surface is monolayer of polytetrafluoroethylene, which is formed by chemical bonds. The primer layer is a fluorine coating method according to any one of claims 1 to 4, characterized in that the substrate surface is a glass coating layer formed by chemical bonding.

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