JP2012040266A - Dip coating apparatus and dip coating method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dip coating apparatus and a dip coating method which can form even coating layers made of non-fluororesin paint at the same time.SOLUTION: The dip coating apparatus or the like for applying non-fluororesin paint coating to several headrest stays simultaneously, includes a moving device moving the device within a specific space in a state that several headrest stays are put in order, a dipping tank in which the non-fluororesin coating material is contained and which applies dip coating to several headrest stays simultaneously, and a heating furnace heating and drying several headrest stays under dip coating with non-fluororesin paint to provide headrest stays provided with a coating film of a specific thickness.

Description

  The present invention relates to a dip coating apparatus and a dip coating method. In particular, the present invention relates to a dip coating apparatus and a dip coating method capable of simultaneously forming a coating film having a uniform thickness on a plurality of headrest stays.

Conventionally, in headrests provided in automobile seats, etc., consideration is given to rust prevention and decoration for headrest stays, which are one of the main components of the headrest, or to slipperiness and durability for stoppers that determine the predetermined position of the headrest. And the manufacturing method including a metal plating process is proposed (refer patent document 1).
More specifically, as shown in FIGS. 6A to 6E, the straight metal pipe 101 is cut into a predetermined length, the end surface 102a of the cut metal pipe 101 is chamfered, and the metal pipe 101 is cut. The headrest stay 115 is manufactured by forming a notch 105 on the outer peripheral surface of the metal plate, further performing nickel chrome plating, etc., forming a metal plating layer 104 on the surface of the metal pipe 101, and then bending it into a substantially U shape. Is the method.

Further, a headrest formed by coating a tetrafluoroethylene resin on a headrest stay that is a component main body of the headrest has been proposed (see Patent Document 2).
More specifically, as shown in FIG. 7, both legs 151b and 151c of the headrest stay are immersed in the tetrafluoroethylene resin solution 154 accommodated in the dip coating tank 155, and the shaft peripheral surface thereof is immersed. The headrest 150 is formed by forming a tetrafluoroethylene resin layer having a low friction coefficient.

In addition, in order to dip-coat a predetermined amount of paint on the substrate to be coated, a liquid non-contact type displacement sensor for detecting the distance to the liquid surface of the paint tank is provided on the substrate-supporting substrate. A dip coating apparatus has been proposed (see Patent Document 3).
More specifically, as shown in FIG. 8, the substrate A to be coated is connected between the origin limit switch 207 and the lower limit overrun limit switch 208 along the pole screw 202 via a pole screw nut 203. A dip provided with a coated substrate support unit 204 that supports the substrate to be moved up and down, a drive unit 201 that drives the coated substrate support unit 204 to move up and down, and a coating tank 212 that dip the coating material onto the coated substrate A In the coating apparatus 200, a non-contact type displacement sensor 209 that detects the distance to the liquid level of the paint tank 212 is provided in the coated substrate support unit 204, and the driving unit 201 is based on the detection signal from the non-contact type displacement sensor 209. Non-contact displacement sensor amplifier 210 and sequence as drive unit control means for controlling driving Over 211 is a dip coating device 200 provided with.

JP 2006-304869 A (Claims) Japanese Patent Laying-Open No. 2005-287738 (Claims) JP-A-9-248507 (Claims)

  However, the manufacturing method of the headrest stay disclosed in Patent Document 1 requires a plating apparatus for a predetermined metal, which increases the manufacturing cost and takes a long manufacturing time. There was also an environmental problem in which nickel chrome, etc. had to be used.

Further, in the headrest stay disclosed in Patent Document 2, although the resin is coated with tetrafluoroethylene resin, not only the adhesion to the headrest stay is poor, but also the durability is insufficient.
Moreover, when the main component is tetrafluoroethylene resin, the viscosity of the coating solution tends to be high, for example, 500,000 mPa · sec (measurement temperature 25 ° C.) or more, and it is difficult to form a uniform thickness coating film. There was also a problem.

Furthermore, in the dip coating apparatus disclosed in Patent Document 3, when a plurality of substrates to be coated are dip coated at the same time, the liquid level fluctuates and the non-contact displacement sensor does not function with high accuracy. .
Therefore, the disclosed dip coating apparatus has a problem that it is difficult to stably obtain a coating having a predetermined film thickness.

Accordingly, as a result of diligent study, the inventors of the present invention have used a non-fluororesin paint as a coating solution in a dip coating apparatus or the like, a predetermined headrest stay moving device, a predetermined immersion tank, and a predetermined heating furnace. And the inventors have found that the above-described problems can be solved, and have completed the present invention.
That is, according to the present invention, it is an object to provide a dip coating apparatus and a dip coating method capable of simultaneously forming a coating film having a uniform thickness on a plurality of headrest stays.

  According to the present invention, there is provided a dip coating apparatus for simultaneously applying a non-fluororesin paint to a plurality of headrest stays, and a moving device that moves in a predetermined space in a state where the plurality of headrest stays are arranged, Fluorine resin paint is housed, and a plurality of headrest stays are dipped in the dip coating at the same time, and a plurality of headrest stays dip-coated with non-fluorine resin paint are heated and dried to provide a coating film of a predetermined thickness A dip coating apparatus including a heating furnace as a headrest stay is provided, and the above-described problems can be solved.

In other words, by configuring the dip coating apparatus in this way and using a predetermined non-fluorine resin paint, it has excellent adhesion and durability to a plurality of headrest stays, and at the same time a coating film with a uniform thickness. Can be formed.
In addition, compared to conventional metal plating coatings, etc., it is extremely inexpensive, has good environmental characteristics, and quickly forms a coating film with excellent appearance on a plurality of headrest stays. Can do.

Further, in configuring the dip coating apparatus of the present invention, the moving device is provided with a plurality of suspenders, and the plurality of suspenders are accommodated in a dipping tank with a plurality of headrest stays held respectively. It is preferable to move the non-fluororesin paint at a predetermined speed.
By comprising in this way, when it contains a reactive metal salt between iron in the non-fluorine resin paint, it can be made to react reliably on the surface of the plurality of headrest stays while dip coating, Moreover, even if it is a case where the reactive metal salt between iron is not included, it can dip-coat with respect to several headrest stays enough and reliably.

Further, in configuring the dip coating apparatus of the present invention, an auxiliary immersion tank for maintaining the liquid level of the non-fluorine resin paint at a predetermined position is provided on the side or the periphery of the immersion tank, and the auxiliary immersion tank is on the side. If it is provided on the side, by providing a connection channel for the non-fluorine resin paint to communicate between the immersion tank and the auxiliary immersion tank, the auxiliary immersion tank surrounds the immersion tank. If it is provided around it, the immersion tank or auxiliary immersion tank is moved up and down so that a part of the non-fluorine resin paint that has flowed into the immersion tank from the auxiliary immersion tank overflows into the auxiliary immersion tank. It is preferable to maintain the liquid level of the non-fluororesin coating material contained in the immersion tank at a predetermined position.
By configuring in this way, the liquid management of the non-fluorine resin paint can be easily and stabilized, so that the change in the coating amount due to the viscosity change of the non-fluorine resin paint can be made uniform. Even with the headrest stay, a coating film having a more uniform thickness can be formed simultaneously.

Further, in configuring the dip coating apparatus of the present invention, after the dip coating of the non-fluorine resin paint, the moving device rotates or vibrates the plurality of headrest stays via the suspension, or the non-fluorine resin It is preferable to remove excess non-fluororesin paint by bringing it into contact with the liquid surface of the paint.
That is, the moving device rotates a plurality of headrest stays, a vibration device for vibrating the plurality of headrest stays, and a predetermined liquid surface contact for contacting the liquid surface of the non-fluororesin paint. It is preferable to provide an apparatus to remove excess non-fluororesin paint.
By providing a rotation device, a vibration device, a liquid level contact device, or the like in this way, it is possible to uniformize the change in coating amount due to the viscosity change of the non-fluororesin coating material, and thus a plurality of headrests. Even with the stay, a coating film having a more uniform thickness can be formed simultaneously.

  Another aspect of the present invention is a dip coating method in which a plurality of headrest stays are simultaneously coated with a non-fluorine resin paint, the preparation step for arranging the plurality of headrest stays in a predetermined state, and the plurality of headrest stays A stay is simultaneously dipped in a dipping tank containing a non-fluorine resin paint and dip-coated, and a plurality of headrests coated with the non-fluorine resin paint are heated and dried to provide a coating film with a predetermined thickness. And a step of forming a headrest stay.

That is, by using a predetermined non-fluorine resin paint and carrying out the dip coating method in this way, it is excellent in adhesion and durability with respect to a plurality of headrest stays, and at the same time a uniform thickness coating film is applied. Can be formed.
And, compared with conventional metal plating coatings, etc., it is extremely inexpensive, has good environmental characteristics, and quickly forms a coating film with excellent appearance on a plurality of headrest stays. Can do.

Further, in carrying out the dip coating method of the present invention, as a non-fluorine resin paint, as a thermoplastic component, polyester resin and phenoxy resin, or any one of them, and further a reactive metal salt with iron It is preferred to use a paint comprising.
By using a predetermined non-fluorine resin paint containing such a thermoplastic component and a reactive metal salt, a predetermined metal substitution reaction, electroless plating reaction, etc. occur, and the adhesion and durability of the coating film to the headrest stay As a result, good liquid stability of the non-fluororesin coating material can be obtained, and as a result, a coating film having a more uniform thickness can be formed simultaneously even with a plurality of headrest stays.

In carrying out the dip coating method of the present invention, it is preferable to hold the headrest stay in the non-fluororesin coating material for at least 1 minute.
Thus, by carrying out dip coating for a predetermined time, even if the non-fluorine resin paint further contains a reactive metal salt with iron, the coating film excellent in adhesion and durability Can be reliably obtained, and a coating film having a more uniform thickness can be simultaneously formed on the plurality of headrest stays.
In other words, when the non-fluorine resin paint contains a reactive metal salt between iron and the like, a simple reaction may not occur if the non-fluorine resin paint is simply dip coated and adhered. It is.

In carrying out the dip coating method of the present invention, it is preferable to provide a degreasing step for degreasing the headrest stay.
By carrying out the dip coating method including the degreasing process in this way, not only the adhesion and durability of the coating film to the headrest stay are further improved, but also excellent adhesion is achieved even with a plurality of headrest stays. It is possible to simultaneously form a coating film having a more uniform thickness.
That is, in the process of manufacturing the headrest stay, oil components and contaminants may adhere to the surface, but even in such a case, the degreasing process can provide a clean surface, and good characteristics can be obtained. The coating film which has can be formed.

FIG. 1 is a diagram provided for explaining an example of the dip coating apparatus of the present invention. Drawing 2 is a figure offered in order to explain a headrest stay and a headrest containing it. Drawing 3 (a)-(b) is a figure offered in order to explain the example of an immersion tank and an auxiliary immersion tank. FIG. 4 is a diagram for explaining a specific example of another immersion tank. FIG. 5 is a process diagram for explaining the dip coating method of the present invention. 6A to 6E are views for explaining a conventional method of manufacturing a headrest stay. FIGS. 7A to 7B are views for explaining another conventional method of manufacturing a headrest stay. FIG. 8 is a diagram for explaining a conventional dip coating apparatus.

[First Embodiment]
As illustrated in FIG. 1, the first embodiment is a dip coating apparatus 10 that simultaneously coats a plurality of headrest stays 20 with a non-fluorine resin paint 24 a, in which a plurality of headrest stays 20 are arranged. Thus, the moving device 12 for moving in the predetermined space and the non-fluorine resin paint 24a are accommodated, and the dipping tank 24 for simultaneously dip-coating the plurality of headrest stays 20 and the non-fluorine resin paint 24a are dip-coated. A dip coating apparatus 10 comprising: a heating furnace 26 that heat-drys a plurality of headrest stays 20 to form a headrest stay having a coating film having a predetermined thickness.
Hereinafter, the dip coating apparatus as the first embodiment and the headrest stay as the coating target will be specifically described with reference to the drawings as appropriate.

1. The object to be processed The aspect of the headrest stay as the object to be processed (coating target) is not particularly limited, but for example, a headrest stay 20 as shown in FIG. 2 is preferable.
That is, the headrest stay 20 is basically composed of an iron pipe or the like, and prevents stress concentration at both the leg portions 20a and 20b, the horizontal portion 20c connecting them, and further at these joint portions. And a bending portion 20d.
Therefore, the headrest stay 20 has a predetermined mechanical strength and can exhibit appropriate flexibility.

Further, both leg portions 20a, 20b of the headrest stay 20 are inserted into large and small insertion holes 66, 68 provided in a seat 70 of an automobile or the like, and are configured to be movable in the vertical direction while sliding.
A plurality of notches 60 are provided in either one of the leg portions 20a and 20b of the headrest stay 20, and any one of the notches 60 and a metal fitting (not shown) accommodated in the stopper 62 are engaged. As a result, the headrest 50 stops at an arbitrary position.
On the other hand, the stopper 62 is provided with a release knob 64 for releasing the engagement between the notch 60 and the metal fitting inside the stopper so that the headrest 50 can be moved for further positioning or the like.

Further, a cavity 52 having a hollow portion is integrally provided around the headrest stay 20 via a welded joint portion 54, so that predetermined cushioning properties and handling properties can be obtained.
That is, although the cavity 52 shown in FIG. 2 is an example, it is a rice ball type | mold, it is comprised in the front part and the back part, and is enclosed so that the headrest stay 20 may be wrapped, and welding joining is carried out. It is firmly fixed to the headrest stay 20 via the portion 54.

In addition, a covering 53 including a cushioning material or the like is provided around the cavity 52, thereby forming a headrest 50 having excellent cushioning properties, light weight, mechanical strength, and the like. Are provided at predetermined positions.
That is, in the headrest 50 having such a configuration, the headrest stay 20 provided with the coating film made of the non-fluorine resin paint of the present invention can exhibit good durability, slipperiness, and the like.

In addition, about the metal fitting (not shown) accommodated in the inside of the stopper 62 mentioned above, it is also preferable to give resin coating which consists of polyamide resin etc. on the surface.
This is because the friction coefficient between the coating film made of the non-fluorine resin paint of the present invention is reduced, the headrest moves smoothly, and the durability of the coating film made of the non-fluorine resin paint of the present invention is increased. This is because the can be further improved.

2. Further, the moving device of the plurality of headrest stays may be a conveyor device or a wire for moving the headrest stays at a predetermined speed while suspending the plurality of headrest stays on at least one of the plurality of suspension tools. preferable.
That is, as indicated by arrows A1, A2, A3, and A4 in FIG. 1, the moving device 12 includes a plurality of suspension tools 18, and a plurality of headrest stays 20 are respectively attached to the plurality of suspension tools 18. It is preferable to move at a predetermined speed while being held.
The reason for this is that, by configuring in this way, a plurality of headrest stays can be efficiently moved even with a moving device having a simple structure.
The plurality of lifting devices 18 may be arranged in one linear line or two or more linear lines in the moving device 12 in consideration of the applicability of the plurality of headrest stays, heat drying properties, or the like. They may be arranged in a zigzag shape, an S shape, or the like.

Further, the configuration of the plurality of suspension tools is not particularly limited, but a hook-like object, a ring-shaped object ( Ring), string-like object, clip, hook-and-loop fastener, adhesive member, etc. For example, as shown in FIG. 1, if the tip 18a of the hanger 18 is a hook-like object, it depends on the size and form of the headrest stay. Therefore, it can be easily and quickly mounted and removed, and the headrest stay preparation process and recovery process can be easily automated.
In addition, if the hanging tool is a ring-shaped object, it can be easily and quickly put on and removed by passing a part of the headrest stay, and the headrest stay is not easily detached.

Moreover, if the hanging tool is a string-like object, it can be firmly held by being tied to a part of the headrest stay regardless of the size and form of the headrest stay.
Further, if the hanging tool is provided with a clip, it can be quickly and firmly held by simply sandwiching a part of the headrest stay, and can be easily removed.
Furthermore, if the hanger is a hook-and-loop fastener or an adhesive member, it can be firmly held regardless of the size and form of the headrest stay.

In addition, as illustrated in FIG. 1, a predetermined long object 14 is provided with a plurality of hanging tools 18 for moving at a predetermined speed while holding a plurality of headrest stays 20. It is preferable that the scale 14 is configured to be freely detached from the conveyor device 12 via a predetermined long object support 16.
That is, it is preferable that the long object 14 holding the plurality of headrest stays 20 is directly moved by the conveyor device 12 as indicated by arrows A1, A2, A3, and A4.
The reason for this is that by moving the plurality of headrest stays via a predetermined long object, it becomes easy to remove the plurality of headrest stays from the hanging tool, and further, the vapor deposition process etc. outside the dip coating apparatus. This is because it is possible to move easily and quickly in units of long objects even when implementing the above.

In addition, although not shown, the moving device rotates a plurality of headrest stays via a suspension, a vibration device that vibrates the plurality of headrest stays, or a tip of the plurality of headrest stays is made of a non-fluorine resin paint. It is preferable to have a liquid level contact device that makes it easy to drop excess paint by contacting the liquid level.
That is, after the non-fluororesin paint is dip-coated in a dipping tank, which will be described later, the moving device rotates or vibrates each of the headrest stays via the hanger, or on the liquid surface of the non-fluorine resin paint. It is preferable to drop and remove excess paint by contact.
Therefore, by removing excess non-fluorine resin paint in this way, uniform coating of non-fluorine resin paint is further ensured, and even a plurality of headrest stays can form a more uniform coating film can do.

3. Immersion tank (1) Configuration 1
The immersion tank is not particularly limited as long as it has a configuration in which a non-fluorine resin paint is accommodated and can be dip coated simultaneously on a plurality of headrest stays, but as an example, it is shown by an arrow B2 in FIG. Thus, it can be set as the aspect which the immersion tank 24 moves to an up-down direction.
That is, as shown in FIG. 3A, the immersion tank 24 includes a main bath 24d for containing the non-fluorine resin paint 24a and a temperature control device 24c for maintaining the non-fluorine resin paint 24a at a predetermined temperature. And a stirring device 24b for stirring the non-fluororesin coating material 24a and various sensors 24e (temperature sensor, pH sensor, liquid level sensor, concentration sensor, etc.).

However, not only the mode in which the immersion tank moves in the vertical direction, but also the mode in which the movement devices for the plurality of headrest stays move in the vertical direction, or both the immersion tank and the movement devices for the plurality of headrest stays, It can also be set as the aspect which moves to an up-down direction.
For example, if the plurality of headrest stay moving devices move in the vertical direction above the immersion tank, it is not necessary to move the relatively heavy immersion tank in the vertical direction. And simplification.
Moreover, by setting both the immersion tank and the plurality of headrest stay moving devices to move in the vertical direction, it is possible to quickly and accurately control the immersion tank at an appropriate position.

In addition, although it can be set as a well-known aspect as the temperature control apparatus 24c and the stirring apparatus 24b, a heater with a thermostat, a stirring blade, an ultrasonic vibration apparatus etc. are mentioned, for example.
In addition, although not shown, the immersion tank preferably further includes a filter for removing contaminants of the non-fluororesin coating material 24a and a moving device for moving the immersion tank up and down.

Further, as shown in FIG. 3A, the immersion tank has an auxiliary immersion tank 24h for keeping the liquid level of the non-fluorine resin coating at a predetermined position, as well as a main immersion tank 24d and an auxiliary immersion tank. It is preferable to provide a connection flow path 24f for connecting 24h to communicate with each other and allowing the non-fluororesin paint to freely come and go, and a valve 24g for blocking the connection flow path 24f as necessary.
This is because the liquid level position of the main immersion tank coincides with the liquid level position of the auxiliary immersion tank by configuring in this way, so that the liquid level of the non-fluorine resin paint in the auxiliary immersion tank is managed. This is because the liquid level of the non-fluororesin paint in the main immersion tank can be easily managed.
Therefore, it becomes easy to manage the liquid amount, concentration, liquid temperature, etc. of the non-fluorine resin paint in the main immersion tank, and even with a plurality of headrest stays, it is possible to form a coating film with a more uniform thickness. it can.

Further, as shown in FIG. 3B, an auxiliary immersion tank 24h ′ larger than the main immersion tank 24d ′ is provided as an immersion tank so as to surround the immersion tank (main immersion tank) 24d ′. The main dipping bath 24d 'and the auxiliary dipping bath 24h', or one of them, is moved up and down as shown by the arrow C1, and the one of the non-fluororesin paints 24a accommodated in the auxiliary dipping bath 24h '. Part can flow into the main immersion bath 24d '.
That is, as shown by the arrow C1, the main dip tank 24d 'is lowered and the main dip tank 24d' is immersed in the auxiliary dip tank 24h ', thereby being accommodated in the auxiliary dip tank 24h'. The liquid level of the fluororesin paint 24a rises.
Along with this, as shown by the arrow C2, the check valve 24j 'provided at the bottom of the main immersion tank 24d' is opened, and a part of the non-fluororesin coating material 24a in the auxiliary immersion tank 24h 'is opened from the opening 24k'. The main immersion tank 24d 'can be introduced into the main immersion tank 24d'.

At that time, a non-fluorine resin paint outlet 24m ′ is provided at a predetermined position of the main immersion tank 24d ′, and when a predetermined amount or more of the non-fluororesin paint 24a flows in, the flow of the non-fluorine resin paint flows. From the outlet 24m ′, the non-fluororesin coating material 24a is returned to the auxiliary immersion tank 24h ′.
Therefore, by simply moving the immersion tank 24d ′ and the auxiliary immersion tank 24h ′ up or down, the whole or a part of the non-fluororesin coating material 24a in the immersion tank 24d ′ and a novel concentration controlled to a predetermined concentration or the like. Non-fluororesin paint can be substituted.
Therefore, since the liquid management of the non-fluorine resin paint in the immersion tank is easy and stabilized, it is possible to uniformize the coating amount change due to the viscosity change of the non-fluorine resin paint, and thus, a plurality of headrests. Even with the stay, a coating film having a more uniform thickness can be formed simultaneously.

Also, a plurality of immersion tanks are prepared, more specifically, at least a first immersion tank and a second immersion tank are prepared, and maintenance is performed according to the state of the non-fluororesin paint. In consideration of this, it is also preferable to select and use one of the immersion baths.
That is, when the concentration or pH of the non-fluororesin paint in the first immersion tank becomes a value outside the predetermined range, the route of the predetermined moving device is switched to control the concentration, pH, or the like within the predetermined range. It is preferable to use a non-fluorine resin paint in the second immersion tank.

Furthermore, it is also preferable to prepare a plurality of immersion tanks and prepare a second immersion tank for temporary maintenance of the first immersion tank.
That is, basically, when the first immersion tank is used for dip coating of a non-fluorine resin paint and the first immersion tank is maintained, the route of the predetermined moving device is switched temporarily, It is preferable to use a second immersion tank.
In that case, since the dip coating in the second immersion tank is temporary, the capacity and equipment of the second immersion tank can be made smaller than the capacity of the first immersion tank.

(2) Configuration 2
Moreover, as shown in FIG. 4, as immersion bath, immersion bath 24 'which has considerable length (L) is prepared along the advancing direction shown by arrow A5, and several immersion baths 24' are prepared. It is preferable to dip-coat the non-fluororesin coating material 24a while moving the headrest stay 20.
The reason for this is that even if the non-fluorine resin coating contains a reactive metal salt with iron, such a dipping bath can sufficiently react on the surface of the headrest stay. is there.
Therefore, since the reactive metal salt or the like is reacted on the surface of the headrest stay while moving the headrest stay, the reaction can be performed in a shorter time and uniformly compared with the case of simply dip coating.

On the other hand, even when the non-fluorine resin paint does not contain a reactive metal salt with iron, by configuring the immersion tank in this way, it is sufficient and reliable for a plurality of headrest stays. Can be dip coated.
In any case, by using such a dipping tank, a coating film excellent in adhesion and durability can be formed efficiently and stably.

  In addition, although the length (L) of this immersion tank can be determined in consideration of the moving time of the headrest stay, the holding time in the non-fluorine resin paint, etc., it is usually a value within the range of 1 to 50 m. It is preferable to set the value within a range of 3 to 30 m, and it is more preferable to set the value within a range of 5 to 20 m.

(3) Non-fluorine resin paint The non-fluorine resin paint housed in the immersion tank is an essential component for 100 parts by weight of a thermoplastic component (including a polymer component and an oligomer component) made of a non-fluorine resin. It is preferable to contain 1 to 50 parts by weight of a curing component (thermosetting component or photocuring component) such as a thermoplastic component and 0.1 to 30 parts by weight of a reactive metal salt with iron.
The reason for this is that by blending the non-fluorine resin paint in this way, it can be uniformly applied to the headrest stay, excellent adhesion can be obtained, and good durability can be obtained. Because.
Therefore, the non-fluororesin coating material accommodated in the immersion tank is composed of 5 to 30 parts by weight of the curing component and 0.5 to 20 parts by weight of the reactive metal salt with iron with respect to 100 parts by weight of the non-fluororesin. It is more preferable to include in a range, and it is more preferable to include 10 to 20 parts by weight of a curing component and 1 to 10 parts by weight of a reactive metal salt between iron.

And although it is an arbitrary component, for example, 0.1 to 10 parts by weight of a colorant, 0.1 to 30 parts by weight of a surfactant, and viscosity adjustment with respect to 100 parts by weight of a thermoplastic component made of a non-fluorine resin 0.1-30 parts by weight of an agent, 0.1-10 parts by weight of an antioxidant, 0.1-30 parts by weight of a rust inhibitor, 0.1-50 parts by weight of a diluent, and 30-150 parts of a solvent. It is preferable to include each in the range of parts by weight.
However, in order to adjust the smoothness and slipperiness of the film in the non-fluororesin coating material accommodated in the immersion tank, 1 part of the thermoplastic component consisting of a small amount of fluororesin, for example, a non-fluorine resin, is 1 It is possible to mix in an amount of less than parts by weight, more preferably in the range of 0.01 to 0.5 parts by weight.

  Here, the thermoplastic component is a kind of acrylic resin, urethane resin, polyimide resin, epoxy resin, oxetane resin, polyester resin, polyamide resin, phenol resin, silicone resin, phenoxy resin, etc. Single or 2 or more types of combinations are mentioned.

In particular, since the viscosity of the non-fluorine resin coating is set to a value within a predetermined range and exhibits excellent adhesion to the headrest stay, the average weight molecular weight obtained as a polystyrene equivalent molecular weight using gel permeation chromatography (GPC) Are preferably polyester-based resins and phenoxy resins having a molecular weight of 8,000 to 120,000.
Moreover, when a polyester-type resin and a phenoxy resin have a hydroxyl group, it is preferable to make this hydroxyl value into the value within the range of 1-500 mgKOH / g.

Moreover, since it has a lower viscosity and exhibits excellent adhesion and durability, it may be an aqueous emulsion containing the above-described polyester resin and / or phenoxy resin and a silicone compound as a thermoplastic component. More preferred.
The reason for this is that the durability, water resistance, flat slipping property, etc. of the coating film can be effectively improved by hydrolytic condensation while the silicone compound reacts with a predetermined polyester resin or phenoxy resin. Because.

In addition, the curing component is blended for curing (three-dimensional crosslinking reaction) of thermoplastic components including the above-described silicone compounds, polyester resins, phenoxy resins, etc., for example, isocyanate compounds, carboxyl compounds, epoxy compounds Etc. are preferably included.
This is because a coating film having high strength and excellent adhesion can be obtained by curing the thermoplastic component.

Moreover, the reactive metal salt between iron is blended in order to improve the adhesion of the coating film to be formed, to give coloration, or to give rust prevention, , Vanadium tannate, molybdenum tannate, 3,4,5-trihydroxybenzenecarboxylic acid and 3,4,5-trihydroxybenzenecarboxylic acid ester, etc., alone or in combination of two or more Is mentioned.
This is because phenolic hydroxyl group-containing compounds react with iron to form iron salts, forming complex compounds, reducing oxygen permeation in the coating film, and exhibiting excellent rust prevention and adhesion This is because it can be done.
In addition, the phenolic hydroxyl group-containing compound also has an advantage that, when the thermoplastic component is a silicone compound, it can also function as an acid catalyst in the hydrolysis condensation reaction.

Moreover, it is preferable to set it as the value within the range whose solution viscosity measured based on JISZ8803 is 10-10,000 mPa * sec (measurement temperature: 25 degreeC) as a non-fluororesin coating material.
This is because a non-fluorine resin paint having such a viscosity can be uniformly attached to the headrest stay.
That is, when the viscosity of the non-fluorine resin coating is less than 10 mPa · sec, it may be difficult to form a coating film having a uniform thickness as a whole due to the surface tension.
On the other hand, when the viscosity of the non-fluororesin coating material exceeds 10,000 mPa · sec, it may be difficult to remove excess coating solution by centrifugal force.
Therefore, the viscosity of the non-fluororesin coating material is more preferably set to a value within the range of 50 to 5000 mPa · sec, and further preferably set to a value within the range of 100 to 1000 mPa · sec.

4). Structure of heating furnace (1) The structure of the heating furnace is not particularly limited as long as the headrest stay to which the non-fluororesin coating material is applied can be heated and dried to a predetermined temperature, and can be appropriately changed.
Accordingly, examples of suitable heating furnaces include a heated air circulation oven, an electric heating furnace, a gas heating furnace, an infrared heating furnace, and a laser heating furnace.
And it is one aspect | mode of these heating furnaces, but as shown in FIG. 1, the hot air 26b of predetermined flow velocity and predetermined temperature is intensively sprayed from the some hot air blowing part 26a provided in the up-down direction, and non-fluorine It is preferable to heat dry the headrest stay to which the resin paint is applied.

(2) Coating Film Properties Although the thickness of the coating film obtained through heat drying in a heating furnace is not particularly limited, it is usually preferably set to a value in the range of 5 to 300 μm.
This is because, if the thickness of the coating film is a value within such a range, a good balance can be obtained between the adhesion and durability of the coating film and the drying property (curability). It is.
Therefore, the thickness of the coating film is more preferably set to a value within the range of 10 to 200 μm, and further preferably set to a value within the range of 20 to 80 μm.

  In addition, regarding a measure of adhesion of the coating film, in a cross-cut test measured in accordance with JIS D 0202, the number of peels is preferably 10 or less / 100-cut, and preferably 5 or less / 100-cut. More preferably, it is 1 or less / 100th grid.

[Second Embodiment]
As illustrated in FIG. 5, the second embodiment is a dip coating method in which a non-fluororesin coating material is simultaneously applied to a plurality of headrest stays, and is prepared for arranging a plurality of headrest stays in a predetermined state. A step (S1), a step (S3) of simultaneously dipping a plurality of headrest stays in a dipping tank containing a non-fluorine resin paint, and a plurality of headrests having a non-fluororesin paint dip-coated And a step (S4) of heating and drying to obtain a headrest stay provided with a coating film having a predetermined thickness.
Hereinafter, the dip coating method according to the second embodiment will be described in detail with a focus on differences from the first embodiment with reference to FIG.

1. Preparation process (S1)
The preparation step is a step of preparing a plurality of headrest stays as adherends to be dip-coated, holding the headrest stays on a hanging tool provided in the moving means, and arranging them in a predetermined state.
That is, a plurality of headrest stays are arranged in a straight line, a straight line, a zigzag line, a zigzag line, and the like so that dip coating and heat drying can be performed efficiently.
If a hanging tool such as a hook-like object is used as the moving means, it can be easily and quickly suspended and arranged in a predetermined state regardless of the size and form of the headrest stay.

2. Degreasing process (S2)
Moreover, although a degreasing process is an arbitrary process, a degreasing tank is provided in the front | former stage of an immersion process, and is a process of cleaning the surface of a headrest stay.
That is, it is preferable to provide a degreasing step including an acid cleaning step, an alkali cleaning step, a neutralization step, etc., or a degreasing step with a halide to previously remove oils and contaminants attached to the surface of the headrest stay. .
The reason for this is that not only the adhesion of the coating film to the headrest stay is improved, but a coating film with a more uniform thickness can be formed even with a plurality of headrest stays. Because.

Moreover, if it is halides, such as a trichloroethane, a trichloromethane, a dichloroethane, and a dichloromethane, as a degreasing liquid, while being excellent in fat removal property and favorable drying property, it can be used suitably.
In addition, since the halide has a characteristic that it easily volatilizes, it is preferable to provide a cooling device above or at the outlet of the degreasing tank to condense and reflux the volatilized halide.

3. Immersion process (S3)
In addition, the dipping step includes a mode in which a plurality of headrest stays are simultaneously dipped in a dipping tank in which a non-fluorine resin paint is accommodated (the dipping tank is moved to dipped the plurality of headrest stays in the non-fluorine resin paint. And dip coating.
That is, in the dipping process, a plurality of headrests are stored in a state in which a non-fluororesin paint maintained at a predetermined temperature, a predetermined pH, and a predetermined concentration is contained in an immersion tank provided with a stirrer for non-fluororesin paint. It is preferable to dip the stays together and dip coat them.
This is because the liquid management of the non-fluorine resin coating is facilitated by carrying out in this way, and even a plurality of headrest stays can form a coating with a more uniform thickness. is there.

Moreover, it is preferable to hold | maintain a headrest stay in a non-fluororesin coating material for at least 1 minute or more in an immersion process.
The reason for this is that, even if the non-fluororesin coating material further contains a reactive metal salt with iron, a coating film excellent in adhesion and durability can be reliably obtained. This is because a coating film having a more uniform thickness can be simultaneously formed on the plurality of headrest stays.
However, if the immersion time is excessively long, the production efficiency may be excessively decreased, and the durability of the formed coating film may be decreased.
Therefore, in the dipping process, it is more preferable to set the holding time for dipping the headrest stay in the non-fluororesin paint within a range of 2 to 30 minutes, and a value within a range of 5 to 15 minutes. Is more preferable.

4). Heat drying process (S4)
Furthermore, the heat drying step is a step of heating and drying a plurality of headrests coated with a non-fluororesin paint under a predetermined condition to obtain a headrest stay provided with a coating film having a predetermined thickness.
The heating temperature is not particularly limited and can be appropriately changed according to the type of non-fluororesin coating material, the moving speed, and the like. Usually, the heating temperature is a value within the range of 80 to 200 ° C. It is preferable to do.
The reason for this is that, if the heating temperature is within such a range, the adhesiveness is excellent and a coating film having a uniform thickness can be efficiently formed.
Therefore, the heating temperature is more preferably set to a value within the range of 100 to 180 ° C, and further preferably set to a value within the range of 120 to 160 ° C.
In addition, although it can change suitably according to the kind of non-fluororesin coating material, a moving speed, etc. also about a heating time, Usually, it is preferable to set it as the value within the range of 1 to 120 minutes, and 10 to 60 minutes. A value within the range is more preferable, and a value within the range of 20 to 40 minutes is more preferable.

5. Headrest stay collection process (S5)
The headrest stay collecting step is a step for efficiently collecting a headrest stay having a predetermined coating film and supplying it to a headrest manufacturing step (not shown) in the next step.
And, for example, if a lifting tool such as a hook-like object is used as the moving means, it can be easily and quickly removed regardless of the size and form of the headrest stay. It can be used quickly in the manufacturing process.

6). Hanger recovery process (S6)
The hanging tool collecting step is a step of efficiently collecting the hanging tool as a part of the moving means after collecting the headrest stay having the predetermined coating film so as to be used again for the dip coating.
That is, it is possible to use again in the preparation process and the like by efficiently recovering the hanger provided in the moving means by a predetermined recovery process.

The method of collecting the suspension is not particularly limited, and after removing the suspension from the moving means and collecting it, it may be returned to the preparation process as it is, or the removed suspension is washed once. After that, you may return to the preparation process.
Furthermore, when the moving means such as the conveyor device draws a loop and returns to the preparation process, the moving means can be used by returning to the next dip coating without removing the hanging tool. it can.

7). Others (1) Moving Step The moving step is a step of moving in a predetermined space in the dip coating apparatus with a plurality of headrest stays arranged.
Here, the predetermined space is a space from a preparation process in which a plurality of headrest stays are arranged to a degreasing process that is the next process, a space from the degreasing process to a dipping process that is the next process, and an immersion process. To the heat treatment process which is the next process.
That is, as shown in FIG. 1, between the preparation step (S1) and the degreasing step (S2), between the degreasing step (S2) and the dipping step (S3), and the dipping step (S3), Each predetermined belt conveyor 12 is configured to be able to move a plurality of headrest stays between the heating and drying step (S4), which means a space in which the plurality of headrest stays move. .

Although not shown, in the degreasing step, when degreasing while moving in the horizontal direction with a plurality of headrest stays arranged, the degreasing tank is also one of the predetermined spaces.
Similarly, although not shown, in the dipping process, when dip coating or the like is performed in a state where a plurality of headrest stays are arranged in a horizontal direction or in a horizontal / vertical combination, such a dipping tank is also used. , One of the predetermined spaces.
Furthermore, in the heat treatment step, when performing heat treatment or the like while moving in the horizontal direction or moving in combination in the horizontal direction / vertical direction with a plurality of headrest stays arranged, such a heating furnace is also One of the predetermined spaces.

Further, the moving speed of the plurality of headrest stays in the moving process is not particularly limited, but is preferably set to a value within a range of 5 to 100 m / min, for example.
This is because, if the moving speed is within such a range, the adhesiveness is excellent and a coating film having a uniform thickness can be efficiently formed.
Therefore, it is more preferable to adjust the moving devices of the plurality of headrest stays as appropriate, and to set the moving speed to a value within the range of 10 to 60 m / min, and even more preferable to set the value within the range of 20 to 40 m / min. .

(2) Water-washing process Moreover, it is preferable to provide the water-washing process of a some headrest stay before the immersion process, before and after the degreasing process mentioned above, or at any one time.
The reason for this is that, by performing the water washing step in this way, not only the adhesion of the coating film to the headrest stay is improved, but also a coating film with a more uniform thickness is formed even with a plurality of headrest stays. Because it can.

[Example 1]
1. Dip coating of headrest stay (1) Preparatory process A dip coating apparatus shown in FIG. 1 is prepared, and a hook-shaped suspension attached to a long object is attached to the tip of an iron pipe having a diameter of 12 mm as shown in FIG. A total of 14 U-shaped headrest stays 20 were suspended in a two-row array.

(2) Degreasing step Next, the conveyor device 12 in the dip coating apparatus 10 shown in FIG. 1 was moved at a speed of 20 m / min in the direction of arrow A1 and stopped above the degreasing tank.
In this state, as shown in FIG. 1, the long object holder 16 of the conveyor device 12 is lowered in the direction of arrow B1 and immersed in a degreasing liquid (trichloroethane, temperature 40 ° C.) for about 1 minute. The surface of the headrest stay 20 was cleaned by applying the ultrasonic vibration.
Thereafter, the long object holder 16 of the conveyor device 12 was raised in the direction of the arrow B1 and further moved in the direction of the arrow A2, and the plurality of headrest stays 20 were stopped above the immersion bath 24.

(3) Immersion step Next, as shown in FIG. 1, the long object holder 16 of the conveyor device 12 is lowered in the direction of the arrow B2, and the coating composition (temperature: 25 ° C.) having the following composition is obtained as the non-fluororesin coating material 24a. A plurality of headrest stays 20 were immersed in the stirring bath 24 in a stirring state in which the head) was housed, and dip-coated at the same time.
1) Silicone compound (ethyl silicate): 100 parts by weight 2) Water-dispersible polyester resin (hydroxyl value: 5.8 mgKOH / g, acid value: 1.7 mgKOH / g): 56 parts by weight 3) Phenolic hydroxyl group-containing compound ( Vanadium tannate): 1.2 parts by weight 4) Cross-linking agent (titanium diisopropoxybis (triethanolamate)): 0.8 parts by weight 5) Isopropanol: 7.5 parts by weight 6) Water: 164 parts by weight The phenolic hydroxyl group-containing compound was immersed in a non-fluorine resin coating for 3 minutes so that it sufficiently reacted.
After that, the long object holder 16 of the conveyor device 12 was raised in the direction of the arrow B2 and further moved in the direction of the arrow A3, and the plurality of headrest stays 20 were guided to the heating furnace 26.

(4) Heating and drying step Next, using a drying furnace 26 shown in FIG. 1, heating at 130 ° C. for 30 minutes while moving a plurality of headrest stays 20 coated with a non-fluororesin paint at a predetermined speed in the direction of arrow A4 Then, the coating film having a thickness of 5 μm was dried by heating and recovered as a headrest stay 20 with a coating film.

2. 2. Evaluation of Headrest Stay (1) Durability After constructing the headrest 50 shown in FIG. 2 from the obtained headrest stay with a coating film, the vertical sliding operation was repeated 1000 times, and the durability was determined according to the following criteria. evaluated.
A: No change in appearance is observed in the coating film.
○: Almost no change in appearance is observed in the coating film.
Δ: A slight change in appearance is seen in the coating film.
X: The change in appearance such as peeling is remarkably observed in the coating film.

(2) Adhesiveness The cross-cut test measured based on JISD0202 was done with respect to the obtained headrest stay with a coating film, and adhesiveness was evaluated by the following reference | standard.
A: The number of peeled pieces is 1 or less / 100th grid.
A: The number of peeled pieces is 2 to 5 pieces / 100th grid.
(Triangle | delta): The number of peeling is 6-10 pieces / 100th grid.
X: The number of peeled is 11 or more / 100th grid.

(3) Uniformity of film thickness Moreover, in the obtained headrest stay with a coating film, the uniformity of the coating film thickness was evaluated.
That is, the thickness of the formed coating film was measured at 10 locations, and the uniformity of the film thickness was evaluated from the variation according to the following criteria. The obtained results are shown in Table 1.
A: The film thickness variation (maximum or minimum value) is less than 5% of the average film thickness.
○: Variation in film thickness (maximum or minimum value) is less than 5% to 10% of the average film thickness.
Δ: Film thickness variation (maximum or minimum value) is 10% to less than 20% of the average film thickness.
X: Variation in film thickness (maximum or minimum value) is 20% or more of the average film thickness.

(4) Storage stability of paint The storage stability of the obtained paint was also evaluated.
That is, the obtained paint was stored in a dark room at 25 ° C. and 50% RH, and the occurrence of precipitates was visually confirmed and evaluated according to the following criteria. The obtained results are shown in Table 1.
(Double-circle): Even if one month passes since a preservation | save start, a deposit is not confirmed.
○: No precipitate is confirmed after 3 weeks from the start of storage.
(Triangle | delta): A deposit is not confirmed when two weeks pass since a storage start.
X: A precipitate was confirmed when two weeks passed from the start of storage.

[Example 2]
In addition to using the water-dispersible phenoxy resin (hydroxyl value: 250 mgKOH / g, acid value: 47 mgKOH / g) alone instead of the water-dispersible polyester resin alone in Example 1, the crosslinking agent was changed to blocked isocyanate Manufactured the headrest stay with a coating film like Example 1, and evaluated the durability of the coating film, etc.

[Example 3]
Instead of the water-dispersible polyester resin alone in Example 1, a water-dispersible polyester resin (hydroxyl value: 5.8 mgKOH / g, acid value: 1.7 mgKOH / g) and a water-dispersible phenoxy resin (hydroxyl value: 250 mgKOH) / G, acid value: 47 mg KOH / g) A headrest stay with a coating film was produced in the same manner as in Example 1 except that a mixture (weight ratio = 90/10) was used. Evaluated.

[Comparative Example 1]
A headrest stay with a coating film was produced in the same manner except that a commercially available tetrafluoroethylene resin coating material was used instead of the coating material in Example 1, and the durability of the coating film was evaluated.

According to the dip coating apparatus and the dip coating method of the present invention, a non-fluorine resin paint is used as a coating solution, and a predetermined headrest stay moving device, a predetermined immersion tank, and a predetermined drying device are provided. As a result, it is possible to simultaneously form a coating film having a uniform thickness on a plurality of headrest stays.
Moreover, the organic coating film formed by the dip coating apparatus or dip coating method of the present invention is extremely inexpensive, has good environmental properties, and has a good appearance as compared with conventional metal plating coatings. An excellent coating film can be rapidly formed on a plurality of headrest stays.

  Therefore, with the dip coating apparatus and dip coating method of the present invention, not only the coating of the headrest stay included in the headrest, but also various metal products, resin products, ceramic products (including glass products), electrical products, automobile-related products. For example, it can be suitably used to form a surface protective film or a rust-proof coating film.

10: Dip coating device, 12: Moving device (conveyor device), 14: Long object, 16: Long object holder, 18: Hanging tool, 18a: Tip part, 20: Headrest stay, 20a, 20b: Both leg parts 20c: horizontal part, 20d: curved part, 22: degreasing tank, 22a: degreasing liquid, 24: immersion tank, 24a: non-fluorine resin paint, 24b: stirring apparatus, 24c: temperature adjusting apparatus, 24d: main immersion tank, 24e: Various sensors (liquid level sensor, etc.), 24f: Connection flow path, 24g: Valve, 24h, 24h ': Auxiliary immersion tank, 24i: Various sensors (liquid level sensor, etc.), 24j': Check valve, 24k ' : Opening, 24m ': Outlet, 26: Heating furnace, 26a: Hot air blowing part, 26b: Hot air, 50: Headrest, 52: Cavity, 53: Coating, 54: Welded joint, 60: Notch, 62: The Wrapper, 64: bracket, 66: large insertion hole, 68: a small insertion hole, 70: seat

Claims (8)

A dip coating device for simultaneously applying non-fluororesin paint to multiple headrest stays,
A moving device that moves in a predetermined space in a state where the plurality of headrest stays are arranged,
The non-fluorine resin paint is accommodated, and the plurality of headrest stays are immersed in a dip coating at the same time,
Heating and drying a plurality of headrest stays dip coated with the non-fluorine resin paint, and a headrest stay having a coating film of a predetermined thickness,
A dip coating apparatus comprising:   The moving device includes a plurality of suspension tools, and the plurality of suspension devices respectively hold the plurality of headrest stays in the non-fluororesin coating material accommodated in the immersion tank at a predetermined speed. The dip coating apparatus according to claim 1, wherein the dip coating apparatus is moved. An auxiliary immersion tank for maintaining the liquid level of the non-fluorine resin paint in a predetermined position is provided on the side or the periphery of the immersion tank.
When the auxiliary immersion tank is provided on the side, by providing a connection flow path for the non-fluorine resin paint to communicate between the immersion tank and the auxiliary immersion tank,
Further, when the auxiliary immersion tank is provided around, a part of the non-fluororesin coating material that is moved up and down in the immersion tank or the auxiliary immersion tank and flows into the immersion tank from the auxiliary immersion tank By overflowing the auxiliary immersion tank,
Maintaining the liquid level of the non-fluororesin paint contained in the immersion bath in a predetermined position;
The dip coating apparatus according to claim 1 or 2.   After the dip coating of the non-fluororesin paint, the moving device rotates or vibrates the plurality of headrest stays via the hanger or contacts the liquid level of the non-fluorine resin paint. The dip coating apparatus according to any one of claims 1 to 3, wherein excess non-fluorine resin paint is removed. A dip coating method for simultaneously applying a non-fluorine resin paint to a plurality of headrest stays,
A preparation step of arranging the plurality of headrest stays in a predetermined state;
Dip coating the plurality of headrest stays by simultaneously immersing them in an immersion tank containing the non-fluorine resin paint; and
Heating and drying a plurality of headrests coated with the non-fluororesin paint, and providing a headrest stay with a coating film having a predetermined thickness;
A dip coating method comprising:   The non-fluororesin paint is characterized by using a paint containing a polyester resin and a phenoxy resin, or any one of them as a thermoplastic component, and further containing a reactive metal salt with iron. Item 6. The dip coating method according to Item 5.   The dip coating method according to claim 5 or 6, wherein, in the dip coating step, the headrest stay is held in the non-fluorine resin paint for at least 1 minute.   The dip coating method according to any one of claims 5 to 7, wherein a degreasing step for degreasing the headrest stay is provided before the dip coating step.

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