JP2005290140A - Powder coating manufacturing method and manufacturing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the uniformity of dispersion of individual component particles, particularly additive mixed component particles, in the production of a powder coating by dry blending performed in a packaging container.
(A) In a box 2 and a bag 4 filled with a base component 10, a required amount of an additional mixed component 14 is added to the base component to form a powder coating material. (B) The rotary blade 8 attached to the lower end of the rotary shaft 6 is inserted into the powder coating material together with the rotary blade protector 30 from above. (C) While continuing the stirring by the rotating blade 8, the rotating blade 8 is lowered and brought close to the bottom of the box 2, and stirring is continued for a predetermined time. (B) The rotating blade 8 is raised while continuing the stirring, and thereafter the stirring of the powder coating by the rotating blade 8 is stopped. (D) The rotating blade 8 is lifted and removed from the box 2, and the box 2 and the bag 4. Close.
[Selection] Figure 9

Description

  The present invention relates to a method and an apparatus for producing a powder coating, and in particular, it is possible to obtain a powder coating satisfying an order specification by adding particles for imparting a specific function according to an individual specification of a small order. The present invention relates to a method and an apparatus for producing a powder coating material.

  In recent years, powder coating has been adopted in various coatings. As for the powder coating used for powder coating, for example, JP-A-8-231892 (Patent Document 1), JP-A-2001-139877 (Patent Document 2) and JP-A-2001-205186 (Patent Document 3). ). The powder coating material contains a resin, a curing agent, and the like, and extender pigments, coloring pigments, and other various additives such as a bright pigment for realizing a metallic feeling or a pearl feeling in the form of particles (powder). Furthermore, the powder coating material may contain a necessary amount of antistatic agent particles so that an appropriate charged state (including an uncharged state) can be obtained depending on the coating method to be applied.

  By the way, the order specification of the powder coating usually involves specifying the presence or absence of a paint color or a bright state in addition to specifying the basic performance of the coating. There are many kinds of paint colors, and there are combinations with the presence or absence of addition of bright pigments.Preparing all of these various powder paints in advance leads to an increase in inventory, which is preferable. Absent.

  Therefore, powder paints that do not contain colored pigments or bright pigments are stocked as base paints, and the ratio of colored pigment or bright pigment particles as additive components to the base paint is added to the base paints according to the order specifications. After being dry-blended to be added and mixed, the powder coating is shipped as desired.

  However, if this dry blending is performed in a mixing container, it is practically difficult to perform mixing for other paint colors or glittering conditions using the same mixing container. This is because when a powder coating material of a specific specification is manufactured, a color pigment or a bright pigment peculiar to the coating color or the bright state adheres to the mixing container in the dry blending process, and this is the case of the powder coating material of another specification. This is because only a low-quality powder coating material that deviates from the desired specification may be obtained by dropping and mixing in the dry blending process during production.

Therefore, dry blending is performed in a state of being accommodated in a packaging container used at the time of shipment. For example, the powder coating material is filled in a bag made of a synthetic resin sheet or the like, and this bag is housed in a box made of cardboard or the like. Therefore, open the packaging container filled with the base paint in advance, add the required color pigment or glitter pigment according to the order specifications here, close the packaging container again, and in this state against the packaging container By applying vibration or rocking, dry blending can be performed.
JP-A-8-231892 JP 2001-139877 A JP 2001-205186 A

  In powder coating, maintaining the uniform dispersion of each component particle in the powder coating used for coating improves the uniformity of the composition in the coating film that is deposited on the object to be coated. This is extremely preferable in reducing variation in the quality of the coated film.

  Although it is preferable to make the dispersion of each component particle uniform before actually applying it to the powder coating site, this operation reduces the efficiency of the coating operation. If possible, it is preferable to increase the dispersion uniformity of each component particle as much as possible when the powder coating is shipped from the factory. If it does so, it will become unnecessary to perform the operation | work for dispersion | distribution homogenization before painting on-site, or the time for it can be shortened.

  However, in the conventional dry blend method in a state where it is accommodated in the packaging container as described above, the fluidity of the powder coating to which the color pigment or the bright pigment is added is not sufficient, and therefore each powder in the powder coating It is difficult to sufficiently improve the uniformity of dispersion of the component particles.

  The present invention has been made in view of the prior art as described above, and it is an object of the present invention to improve the dispersion uniformity of each component particle, particularly an additive mixed component particle, in the production of a powder coating by dry blending performed in a packaging container. is there.

According to the present invention, the above object is achieved as follows:
In a method for producing a powder coating material comprising a base component and an additive mixture component added thereto in a form filled in a packaging container, the base component is contained in the packaging container filled with the base component. The stirring component is added to the required amount of the additive mixture component, and the stirring of the powder coating material comprising the base component and the additive component mixture is stopped by the stirring member disposed in the packaging container. Removing from the packaging container, and closing the packaging container,
Is provided.

  In one aspect of the present invention, the stirring member is inserted into the powder coating material from above and placed in the packaging container, and the stirring member is placed on the packaging container while continuing stirring by the stirring member. The stirrer is raised while approaching the bottom, and then the stirring is continued. Thereafter, the stirring of the powder coating material by the stirrer is stopped, and the stirrer is removed from the packaging container.

  In one aspect of the present invention, the packaging container includes a bag made of a synthetic resin sheet for filling the powder paint and a box made of cardboard for containing the bag. In one aspect of the present invention, the additive mixture component is a bright pigment or an antistatic agent. In one aspect of the present invention, the stirring member is a rotary blade attached to the lower end portion of the rotary shaft. In one aspect of the present invention, the rotary blade has an inclination angle of 45 degrees to 80 degrees with respect to a plane orthogonal to the rotation axis.

In addition, according to the present invention, the above-mentioned object is achieved as follows:
A form in which a powder coating material comprising a base component and an additive mixed component added thereto is filled in a packaging container comprising a bag for filling the powder coating material and a box for containing the bag. A container mounting portion for mounting the packaging container, a stirring member that is disposed above and mounted on a lower end of the rotating shaft, and the rotating shaft is rotatable. And an elevating part that is movable in the vertical direction and an elevating drive part that drives the vertical movement of the elevating part. An apparatus for producing a powder coating material, characterized in that a rotor blade protector disposed between the rotor blade and the bag is attached when disposed in a bag,
Is provided.

  In one aspect of the present invention, the rotary blade has an inclination angle of 45 degrees to 80 degrees with respect to a plane orthogonal to the rotation axis. In one aspect of the present invention, the lower portion of the rotor blade protector is tapered. In one aspect of the present invention, the elevating drive unit includes a first cylinder device that moves the elevating unit in the up and down direction with a first stroke, and the elevating unit that moves the first cylinder device in the up and down direction. And a second cylinder device that moves the cylinder up and down with a second stroke. In one aspect of the present invention, the container placement unit is a conveyor that conveys the container.

  In the method and apparatus for producing a powder coating material according to the present invention as described above, the stirring is stopped after the stirring member is arranged in each packaging container to stir the powder coating material in the packaging container. Then, by removing the stirring member from the packaging container, good stirring of the powder coating by the stirring member is realized, and thus the uniformity of dispersion of each component particle, particularly the added mixed component particle, in the dry blend is improved. Can do.

  Hereinafter, embodiments of a method for producing a powder coating material according to the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a front view showing an embodiment of a powder paint manufacturing apparatus according to the present invention used for carrying out the powder paint manufacturing method according to the present invention, and FIG. 2 is a partial side view thereof. FIG. 3 is a partial rear view of the present embodiment, and FIG. 4 is a schematic partial plan view of the present embodiment. FIG. 5 is a partial front view showing a rotating shaft and a rotating blade in the present embodiment. 6 is a front view showing the rotor blade protector in the present embodiment, FIG. 7 is a plan view thereof, and FIG. 8 is a partial cross-sectional view taken along line A-A ′ of FIG. 6.

  FIG. 9 and FIG. 10 are process cross-sectional views showing an embodiment of the powder coating material production method of the present invention implemented using the powder coating material production apparatus of the present embodiment.

  In this embodiment, a base component is prepared by previously mixing some of a resin for powder coating, a curing agent, and extender pigments, coloring pigments, and other various additives at a predetermined ratio. Separately, an additive mixture component to be added to and mixed with the base component is prepared according to the order specification. Then, the additive mixture component is added to the base component in a ratio corresponding to the order specification in the packaging container, and stirring for homogenizing the components of the powder coating is performed using the stirring member.

  A bright pigment is illustrated as an additional mixing component. As the bright pigment, flaky metal powder such as aluminum, zinc, bronze, nickel, titanium or stainless steel, pearl powder or mica powder can be used. The additive mixture component is not limited to this, and for example, a color pigment, an antistatic agent, and other additives whose types and addition amounts are changed according to the order can be used. The ratio of the additive mixture component in the powder coating is, for example, 0.1% by weight to 10% by weight, particularly 1% by weight to 3% by weight.

  Resin for powder coating, which is the main component of the base component, includes polyester-urethane curing resin, polyester-epoxy curing resin, epoxy resin, acrylic resin, acrylic-polyester resin, fluorine-based resin, acrylic-urethane Examples include curable resins, acrylic-melamine curable resins, and polyester-melamine curable resins. These resins can be used alone or in combination of two or more as required. If necessary, the base component may additionally contain a modified resin such as a novolak resin, a phenoxy resin, a butyral resin, a ketone resin, a polyester resin, or rosin, or a plasticizer such as an epoxidized oil or dioctyl phthalate. it can.

  As extender pigments, silica, talc, barium sulfate, calcium carbonate or glass flakes can be used. In addition, as the coloring pigment, titanium dioxide, bengara, iron oxide, zinc powder, carbon black, phthalocyanine blue, phthalocyanine green, quinacridone pigment, azo pigment, isoindolinone pigment or various calcined pigments may be used. it can.

  As other additives, an anti-sagging agent, a surface conditioner, a crosslinking accelerator, an ultraviolet absorber, a light stabilizer or an antioxidant can be used as necessary.

  As shown in FIGS. 9 and 10, the packaging container is a synthetic resin sheet for filling a powder coating material, for example, a bag 4 made of a polyvinyl chloride sheet, a polyethylene sheet, or a polypropylene sheet, For example, the bag 4 is made of a cardboard box 2 for accommodating the bag 4.

  As the stirring member, a rotary blade 8 attached to the lower end portion of the rotary shaft 6 in the vertical direction by welding or the like can be used. As shown in FIG. 5, the inclination angle θ of the rotary blade 8 with respect to a plane orthogonal to the rotation axis 6 (that is, a horizontal plane) is preferably 45 to 80 degrees. This is for facilitating the downward insertion of the rotary blade 8 into the powder coating material and enhancing the stirring effect. That is, if the inclination angle θ is too small, it tends to be difficult to insert the rotary blade 8 into the powder coating material, and if the inclination angle θ is too large, it is difficult to obtain a good stirring effect.

  Hereinafter, steps will be described in accordance with FIGS. 9A to 9D and FIGS. 10A and 10B.

  First, as shown in FIG. 9A, the base component 10 is put into a bag 4 accommodated in the box 2 and having a mouth opened upward by a feeder (not shown). Next, a required amount of the added mixed component 14 is put into the bag 4 by a feeder (not shown). The required amount of the additive mixture component 14 is determined according to the order specification. The base component 10 and the additive mixture component 14 constitute a powder coating material.

  Next, as shown in FIG. 9B, the rotary blade 8 is inserted downward into the powder coating material. This insertion is not performed directly up to the position close to the bottom of the box 2 (the position at the height H2 from the box bottom shown in FIG. 9C), but from the bottom of the box 2 to the position at the height H1. Here, the difference between the height H1 and the height H2 is, for example, about 100 mm, and the difference in height is about 1/4 to 3/4 of the thickness of the powder coating in the box 2 (in the bag 4). It is. In this state, the rotating shaft 6 is rotated, and stirring of the powder coating material by the rotating blade 8 is started.

  Next, while the stirring of the powder coating material by the rotary blade 8 is continued, the rotary blade 8 is lowered to a position close to the bottom of the box 2 (position of height H2 from the box bottom shown in FIG. 9C). The rotating direction of the stirring blade 8 is such that the powder coating is propelled downward, and this causes a convection state 15 of the powder coating as shown by an arrow in FIG. 9C. In this state, stirring is continued for an appropriate time to sufficiently disperse and mix the base component and the additive mixture component, and then the rotor blade 8 is raised to the height position shown in FIG. To stop. Stirring conditions such as the stirring time and the conditions of rotation and vertical movement of the rotor blade 8 can be appropriately determined according to the powder coating to be manufactured.

  Next, as shown in FIG. 9 (d), the rotor blade 8 is moved upward and removed from the box 2. As a result, a deposition state 16 is formed in which the base component and the additive mixture component are sufficiently satisfactorily dispersed in the bag 4.

  Next, as shown in FIG. 10 (a), the opening of the bag 4 is closed and sealed with an appropriate bundle fastener such as a rubber band, and further, as shown in FIG. 10 (b). Close box 2. Thereby, the powder coating material which consists of a base component and an addition mixing component is obtained with the form accommodated in the packaging container.

  Next, the configuration and operation of the powder coating material manufacturing apparatus shown in FIGS. 1 to 8 will be described with reference to FIGS.

  In this apparatus, a roller conveyor 22 is disposed on the base unit 20, and the conveyor is driven by a drive motor 24. On the conveyor 22, a product filled with a powder coating material composed of the base component 10 and the additive mixture component 14 is transported into the bag 4 of the packaging container composed of the box 2 and the bag 4. The conveyance direction is the direction of the arrow F shown in FIGS. A guide wall member 40 for guiding the box is provided in the transport path of the box 2, and the front end of the box 2 transported through the box 2 is brought to the position by the first limit switch 42 and the second limit switch 43. The arrival is detected. Further, first to third stoppers 44, 45, and 46 are provided for stopping and holding the box 2 at a predetermined position below the stirring blade 8 in the transport path. When the box 2 is detected by the first limit switch 42, the first stopper 44 advances upward in the conveyance path of the box 2 by the cylinder device. Thereby, the progress of the box 2 in the direction of arrow F is prevented. Further, the second stopper 45 advances upward in the conveyance path of the box 2 by the cylinder device when the box 2 in contact with the first stopper 44 is detected by the second limit switch 43. Thereby, the movement of the box 2 in the direction opposite to the arrow F is prevented. At this stage, the conveyance of the box 2 by the conveyor 22 is stopped. Further, after the second stopper 45 has advanced into the box transport path, the third stopper 46 has advanced into the transport path of the box 2 in the horizontal direction by the cylinder device. As a result, the box 2 is held between the third stopper 46 and the guide wall member 40, and the horizontal movement perpendicular to the arrow F is prevented. Thus, the positioning of the box 2 is completed. That is, in this embodiment, the conveyor 22 is used as a container placement unit. After the stirring of the powder coating material in the box 2 positioned at a predetermined position is completed, the first to third stoppers 44, 45, 46 are retracted from the transport path of the box 2 by the reverse operation to the above, and the conveyor 22 transports the box 2 in the direction of arrow F.

  A column part 26 is attached to the base part 20 on the side of the conveyance path of the box 2. The column part 26 is provided with an elevating part 28 that can move in the vertical direction. The vertical movement of the elevating unit 28 is driven by the elevating drive unit 27. The raising / lowering drive part 27 consists of the 1st cylinder apparatus 27A, the 2nd cylinder apparatus 27B, and the coupling member 27C which connects these. As shown in FIG. 3, the first cylinder device 27 </ b> A includes a cylinder whose upper end is fixed to the elevating part 28, and a piston rod that extends downward from the lower end of the cylinder. On the other hand, as shown in FIG. 3, the second cylinder device 27 </ b> B includes a cylinder fixed to the column portion 26 and a piston rod extending upward from the upper end of the cylinder. The lower end portion of the piston rod of the first cylinder device 27A and the upper end portion of the piston rod of the second cylinder device 27B are coupled by a coupling member 27C.

  A rotating blade protector 30 extending downward is attached to the elevating unit 28. As shown in FIGS. 6 to 8, the rotor blade protector 30 is coupled to four rods 30a extending in a substantially vertical direction with a slightly narrowed inclination, and upper and lower ends thereof, respectively. This is a substantially rectangular parallelepiped structure composed of the upper frame 30b and the lower frame 30c. The upper frame 30b is fixed to the elevating part 28. As shown in FIG. 8, the lower frame 30c of the rotor blade protector 30 is tapered and has a sharp wedge shape downward.

  The elevating part 28 supports the rotary shaft 6 so as to be rotatable. Specifically, the upper end portion of the rotating shaft 6 is connected to an air motor 32 which is a rotation driving means, and the air motor is attached to the elevating unit 28. The rotary blade 8 attached to the lower end portion of the rotary shaft 6 is at a position higher than the lower frame 30c of the rotary blade protector 30, so that the rotary blade 8 and the rotary blade protector 30 enter the bag 4 in the box 2. Even if the above-described stirring action is performed, the bag 4 does not enter the inside of the rotor blade protector 30, and the bag 4 does not get entangled with the rotor blade 8 and the rotating shaft 6.

  The support column 26 includes a motor 24 for driving the roller conveyor 22, a cylinder device for driving the first to third stoppers 44 to 46, and an elevating drive unit for driving the elevating unit 28 to move in the vertical direction. 27 and an operation panel 36 that is operated when controlling the operation of the air motor 32 for rotationally driving the rotary shaft 6 is attached.

  The relationship between the raising / lowering of the elevating unit 28 by the elevating drive unit 27 and the stirring of the powder coating material by the apparatus of the present embodiment will be further described.

  Until the box 2 containing the bag filled with the powder coating material obtained by adding the required amount of the added mixed component to the base component is held at a predetermined position below the stirring blade 8 in the transport path F, In the elevating part, the piston rod of the second cylinder device 27B is at the upper limit position of the stroke (second stroke), and the cylinder of the first cylinder device 27A is at the upper limit position of the stroke (first stroke). is there. Therefore, the raising / lowering part 28 exists in an upper limit position, and the stirring blade protector 30 exists in the position which does not prevent conveyance of the box 2. FIG.

  After the box 2 is held at a predetermined position for stirring the powder coating material, the cylinder of the first cylinder device 27A is lowered to the lower limit position. Thereby, the state of FIG. 9B is realized. At that time, since the lower frame 30c of the stirring blade protector 30 forms a sharp wedge shape downward and the inclination angle θ of the stirring blade 8 is 45 degrees to 80 degrees, the stirring blade protector 30 and the stirring blade 8 Insertion into the powder coating is easy. During this insertion, the stirring blade 8 can be rotated slightly based on the resistance of the powder coating material.

  When shifting from the state of FIG. 9B to the state of FIG. 9C, the piston rod of the second cylinder device 27B is lowered to the lower limit position of the stroke. Further, when shifting from the state of FIG. 9C to the state of FIG. 9B, the piston rod of the second cylinder device 27B rises from the lower limit position of the stroke to the upper limit position. In the transition process and during the stirring of the powder coating in the state of FIG. 9C, some powder coating particles rise, so that they are prevented from scattering to the surroundings, as shown in FIG. As shown in b) and (c), the elevating part 28 is provided with a powder scattering prevention hanging body 29 that hangs down around the upper end opening of the box 2. Accordingly, even in the state of FIG. 9B, it is possible to prevent the powder coating particles from being scattered from between the box 2 and the elevating unit 28. Further, the exhaust pipe 31 is connected to the elevating part 28, and stirring is performed while exhausting the inside of the box 2 by the exhaust means connected to the exhaust pipe, so that outside air is generated between the box 2 and the elevating part 28. Since it flows in, it is possible to more favorably prevent the powder coating material particles from scattering from between the box 2 and the elevating part 28 to the surroundings.

  Further, when the state of FIG. 9B is changed to the state of FIG. 9D from the state of FIG. 9D, the cylinder of the first cylinder device 27A is raised from the lower limit position to the upper limit position. .

It is a front view which shows one Embodiment of the powder coating material manufacturing apparatus by this invention used for implementation of the powder coating material manufacturing method by this invention. FIG. 2 is a partial side view of the apparatus of FIG. 1. FIG. 2 is a partial rear view of the apparatus of FIG. 1. It is a typical fragmentary top view of the apparatus of FIG. It is a partial front view which shows the rotating shaft and rotary blade in the apparatus of FIG. It is a front view which shows the rotary blade protector in the apparatus of FIG. It is a top view of a rotary blade protector. FIG. 7 is a partial cross-sectional view taken along line A-A ′ of FIG. 6. It is process sectional drawing which shows one Embodiment of the powder coating material manufacturing method of this invention. It is process sectional drawing which shows one Embodiment of the powder coating material manufacturing method of this invention.

Explanation of symbols

2 Box 4 Bag 6 Rotating shaft 8 Rotating blade 10 Base component 14 Additive mixing component 15 Convection state base component and addition mixing component 16 Deposited base component and addition mixing component 20 Base unit 22 Roller conveyor 24 Drive motor 26 Strut unit 27 Lifting Drive Unit 27A First Cylinder Device 27B Second Cylinder Device 27C Connecting Member 28 Lifting Unit 29 Powder Spattering Prevention Hanging Body 30 Rotor Blade Protection Body 30a Rod 30b Upper Frame 30c Lower Frame 31 Exhaust Pipe 32 Air Motor 36 Operation Panel 40 Guide wall member 42 First limit switch 43 Second limit switch 44 First stopper 45 Second stopper 46 Third stopper

Claims (11)

In a method for producing a powder coating material comprising a base component and an additive mixture component added thereto in a form filled in a packaging container, the base component is contained in the packaging container filled with the base component. The stirring component is added to the required amount of the additive mixture component, and the stirring of the powder coating material comprising the base component and the additive component mixture is stopped by the stirring member disposed in the packaging container. Is removed from the packaging container, and the packaging container is closed. The stirring member is placed in the packaging container by inserting it into the powder paint from above, and the stirring member is brought close to the bottom of the packaging container while continuing stirring by the stirring member, and then stirring is continued. The powder coating material according to claim 1, wherein the stirring member is raised while the stirring of the powder coating material by the stirring member is stopped, and the stirring member is removed from the packaging container. Manufacturing method. The packaging container includes a bag made of a synthetic resin sheet for filling the powder coating material and a box made of cardboard for containing the bag. The manufacturing method of the powder coating material in any one of -2. The method for producing a powder coating material according to any one of claims 1 to 3, wherein the additive mixture component is a bright pigment or an antistatic agent. The method for producing a powder coating material according to any one of claims 1 to 4, wherein the stirring member is a rotary blade attached to a lower end portion of a rotating shaft. The method for producing a powder coating material according to claim 5, wherein the rotary blade has an inclination angle of 45 degrees to 80 degrees with respect to a plane orthogonal to the rotation axis. A form in which a powder coating material comprising a base component and an additive mixed component added thereto is filled in a packaging container comprising a bag for filling the powder coating material and a box for containing the bag. A container mounting portion for mounting the packaging container, a stirring member that is disposed above and mounted on a lower end of the rotating shaft, and the rotating shaft is rotatable. And an elevating unit that is movable in the vertical direction and an elevating drive unit that drives the vertical movement of the elevating unit, and the elevating unit has the rotating blades positioned in the container mounting unit. An apparatus for producing a powder coating material, comprising a rotor blade protector disposed between the rotor blade and the bag when disposed in a bag. The apparatus for producing a powder coating material according to claim 7, wherein the rotary blade has an inclination angle of 45 degrees to 80 degrees with respect to a plane orthogonal to the rotation axis. The apparatus for producing a powder coating material according to any one of claims 7 to 8, wherein a taper is attached to a lower portion of the rotor blade protector. The elevating drive unit moves the elevating unit in a vertical direction with a first stroke, and moves the first cylinder device in a vertical direction to move the elevating unit in a vertical direction with a second stroke. The apparatus for producing a powder coating material according to any one of claims 7 to 9, further comprising: a second cylinder device that is moved to the second cylinder device. The said container mounting part consists of a conveyor which conveys the said container, The manufacturing apparatus of the powder coating material in any one of Claims 7-10 characterized by the above-mentioned.

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