JP2008000671A - Coating apparatus and coating method suitable for forming thick coating film with high viscous coating material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coating apparatus and a coating method suitable for forming a thick coating film with a high viscous coating material, wherein the high viscous coating material having 5-50 Pa s viscosity is applied by one brush coating to form a coating film having thickness of ≥450 μm in a wet state and ≥350 μm in a dry state. <P>SOLUTION: A piston body which is freely slidably housed in a coating tank 2 and by which the inside of a tank body 11 is partitioned into a bottom side coating material section and a top part side compressed air section is provided with a handle part for taking out from the inside of the tank body 11 and a hair bundle part 62 of a coating tool 6 connected to the coating tank is obliquely trimmed so that the height of hair materials of both side parts in the thickness direction are made shorter from the inside toward the outside of the hair bundle part. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a coating apparatus suitable for thick film coating of a high-viscosity paint and a coating method using the apparatus.

  Conventionally, as a painting machine used for painting high structures, an operator carries a portable gas cylinder, carries a backpack-type paint tank, and pumps the paint in the paint tank to an applicator such as a brush with the gas pressure of the gas cylinder. Many types of coating machines have been developed (for example, Patent Documents 1 and 2).

  In this type of coating machine, there is a limit to the capacity of the paint that can be accommodated in the carry type paint tank, and it is necessary to replenish the paint frequently. Therefore, the paint tank is provided with a paint inlet at the top.

  In addition, a compressed gas injection port is required, but it is not easy to push up the paint from the bottom of the paint tank.Therefore, a gas injection port is provided at the top of the paint tank and pumped from the top of the paint tank through a pipe. Adopted.

The pumping system that lifts the paint through the pipe in the paint tank in this way simply connects the hose to the bottom of the paint tank, attaches the applicator to the end of the hose, and compresses from the top of the paint tank. When attempting to inject gas, only the paint at the hose connection port at the bottom of the paint tank is discharged in advance, creating a gap, which causes compressed gas to leak from the applicator through the hose. This is because the paint cannot be supplied sufficiently. Such a phenomenon (referred to as channeling phenomenon) becomes more prominent as the viscosity of the paint to be discharged increases.
Japanese Patent Laid-Open No. 10-34063 JP 2002-263556 A

  In order to improve the anticorrosion properties, it is desirable to perform thick film coating with a film thickness of about 125 μm or more. However, in the conventional coating method, due to the influence of gravity and pressure loss between the pipes in the tank body, 5 Pa · A high-viscosity paint of about s or more cannot supply a sufficient amount of paint, and it is not easy to obtain a desired thick film by a single application.

  In addition, a paint having a high viscosity of about 5 Pa · s or more generally tends to accumulate on the brush when the brush is applied. That is, as shown in FIG. 11, the paint X accumulates on the brush on the side where the paint is distributed. When this paint reservoir X is turned back to the position of X-2 when the brush is turned back, it falls from the brush and paint loss increases, and the fallen paint scatters to the surroundings and adversely affects the surrounding environment. If coating is performed in a state where the paint is accumulated, it becomes a factor that hinders the smoothness of the coating surface.

  Accordingly, an object of the present invention is to provide a coating apparatus and a coating method suitable for thick film coating of a high viscosity paint that can efficiently and thickly coat even a high viscosity paint.

  In order to achieve the above object, a coating apparatus according to the present invention is a coating apparatus for coating a high-viscosity paint with a thick film, and includes a backpack-type paint tank provided with a compressed gas injection port at an upper portion thereof, and the compressed gas. A pressure regulator that regulates the supply pressure of the paint, an applicator that is connected to the backpack-type paint tank by a flexible pipe for supplying paint, and a control unit that controls the flow rate of the paint in the flexible pipe. The paint tank includes a shoulder-type cylindrical container body provided with a paint discharge port on the bottom surface, a lid that is airtightly attached to the top opening of the container body, and slides into the container body. And a piston body that is freely accommodated and partitions the inside of the container body into a bottom-side paint chamber and a top-side compressed gas chamber.

  The piston body is preferably housed so as to be freely removable from the top opening of the container body, and further preferably includes a handle for taking it out from the container body.

  The piston body is preferably formed of an elastic material and has flexibility.

  The piston body preferably has a suction cup shape.

  Further, it is preferable that a compression spring is accommodated in the top side compressed gas chamber, and an end portion of the compression spring presses an upper portion of the piston body. And it is preferable that the said compression spring is comprised so that the said piston body may be hold | suppressed with the force of 0.5-30N.

  The applicator includes a handle, and a hair bundle portion in which a base of a hair material is bundled and fixed in a rectangular shape, and the flexible tube is connected to receive paint supply, and the hair bundle It is preferable that the bristle material on both sides in the thickness direction of the part is trimmed obliquely so that the hair length becomes shorter as it goes from the inside to the outside of the hair bundle part.

  It is preferable that the bristle material at the end in the hair width direction of the hair bundle part is trimmed obliquely so that the hair length becomes shorter from the inside to the outside of the hair bundle part.

  In order to achieve the above object, a coating method according to the present invention is a method of coating using the coating apparatus, and has a viscosity of 5 to 50 Pa · s in the bottom side coating chamber of the cylindrical container body. The pressure of the compressed gas supplied to the backpack-type paint tank by the pressure regulator is adjusted so that the discharge flow rate of the paint from the backpack-type paint tank to the applicator is 500 to 2000 g / min. It adjusts and applies a coating material to a to-be-coated surface with the said applicator.

  In the above-described coating method, when carbon dioxide is used, it is preferable to store alcohol or a mixture of alcohol and water in the top side compressed gas chamber.

  In the coating method, the paint contains an epoxy resin (D) having two or more epoxy groups in one molecule, a scaly pigment (E), and an amine curing agent (F), and It is preferable that the content of the flake pigment (E) is 5 to 100 parts by weight with respect to 100 parts by weight of the solid content of the resin (D).

  According to the present invention, the piston body accommodated in the paint tank prevents the compressed gas from leaking through the flexible pipe for supplying paint, while the handle is provided. It can be easily removed from the opening and can be refilled with paint. And since the coating weight in a container main body adds the dead weight of a coating material and the load of a piston in addition to the pressing force by compressed gas, even if it is a highly viscous coating material, it is pumped efficiently.

  In addition, the paint flows along the trimmed inclined portion formed in the hair bundle part, so that the scattering of the paint is reduced and the paint is also prevented from accumulating on the hair material. In addition to preventing paint loss and scattering due to paint dropping from the brush, it is possible to obtain a good finish with good coating efficiency.

  A preferred embodiment of a coating apparatus according to the present invention will be described below with reference to FIGS. In addition, the same code | symbol was attached | subjected to the same component through the whole figure and all embodiment.

  The coating apparatus 1 includes a paint tank 2, a gas cylinder 3 that supplies compressed gas to the paint tank 2, a pressure regulator 4 such as a regulator that is attached to the compressed gas supply pipe 3a and adjusts the supply pressure of the compressed gas, It has a tank 2 and an applicator 6 connected by a flexible pipe 5 for supplying paint. Further, the compressed gas supply pipe 3 a is provided with an on-off valve (two-way valve) 7 and a manually operated relief valve 8.

  The material of the gas supply hose 3a is not particularly limited, and materials such as urethane and nylon can be used, but those having a breaking pressure of 2.4 MPa or more and a working pressure of 0.6 MPa or more are preferable. In this embodiment, a urethane tube having an inner diameter of 4 mm, an outer diameter of 6 mm, a breaking pressure of 2.4 MPa, and a normal pressure of 0.6 MPa is used.

  Further, the material of the flexible tube 5 for supplying paint is not limited as long as it has solvent resistance and has a breakdown pressure of 2.1 MPa or higher and a pressure resistance of 0.5 MPa or higher. Here, the solvent resistance means that there is no swelling or alteration upon contact with toluene or xylene. Examples of such materials include urethane and nylon.

  In addition, since the paint supply flexible tube 5 has a large pressure loss when the inner diameter is small, a material having an inner diameter as large as possible is used. The range of the inner diameter of the flexible tube 5 for supplying paint is preferably 5 to 15 mm. If the inner diameter is smaller than 5 mm, the pressure loss is large, and in order to obtain a sufficient discharge amount, it is necessary to increase the gas pressure. On the other hand, if the inner diameter is larger than 15 mm, the operability (handling) of the flexible pipe 5 for supplying paint is performed. This is because it is bad and interferes with the painting work. The flexible tube 5 for supplying paint used in the present embodiment has a two-layer structure in which the inside is nylon and the outside is urethane, the breaking pressure is 2.1 MPa, the working pressure is 0.5 MPa, and the inner diameter is 9. The thing of 5mm and external shape 13mm is used.

  The paint tank 2 includes a cylindrical container body 11 provided with a paint discharge port 10 on the bottom surface, a lid 13 which is airtightly attached to the top of the container body 11 and provided with a compressed gas injection port 12, and a cylinder. And a piston body 15 that is slidably accommodated in the container body 11 and partitions the container body 11 into a bottom-side paint chamber 11a and a top-side compressed gas chamber 11b.

  The compressed gas injection port 12 may be attached to the upper peripheral surface of the container body 11. Further, the pressurized gas cylinder 3 can be attached to the container body 11 or the lid body 13 in addition to being suspended from a waist belt or the like. Further, instead of the pressurized gas cylinder, a compressor (not shown) is installed as a compressed gas supply source, and the compressor discharge port and the compressed gas injection port 12 are connected by a hose (not shown) to supply the compressed gas. Anyway.

  The piston body 15 can be provided with a handle portion 21 at the periphery, and if the lid body 13 of the container body 11 is removed, the piston body 15 can be easily pulled out from the container body 11 with the handle portion 21 and taken out. ing. The handle portion 21 is not particularly limited as long as it can be pulled out from the container body 11 by picking it with a hand or hooking it with a tool.

  Although not shown, the paint tank 2 has a shoulder band, a waist band and the like, and is a portable type such as a backpack type and a waist belt hanging type.

  The applicator 6 includes a handle 61 and a hair bundle portion 62 in which the base of the hair material is bundled in a rectangular shape and bound and fixed. The hair bundle portion 62 is connected to the flexible tube 5 and receives supply of paint.

  The hair bundle portion 62 is trimmed diagonally so that the hair material on both sides in the thickness direction (left-right direction in FIG. 3) becomes shorter as it goes from the inside to the outside.

The hair bundle portion 62 has a tip end thickness dimension (D) of 10 to 20 mm in the thickness direction central portion where hair materials that are not short are gathered, and the thickness direction of the hair bundle portion 62 from the hair material tip position in the center portion. The distance (H ₁ ) to the furthest hair tip position of the shortest furrow on the outermost side is 20 to 40 mm, and the trimming angle θ ₁ is in the range of 2 to 70 °, preferably 10 to 30 °.

  By trimming the hair material of the hair bundle portion 62 in this manner, when the horizontal coating (application by movement in the left-right direction in FIG. 3) is performed, the coating material flows along the trimmed inclined portion, so that the coating material is scattered. And the accumulation of paint on the hair material is also reduced, and as a result, a good paint finish is obtained.

  Further, when distributing the paint (when spreading), it is possible to mainly use the portion that is not trimmed (the root portion of the hair bundle portion), and use the portion that is trimmed during the finish coating. The part that has not been trimmed is relatively firm against the part that has been trimmed (the repulsive force is large), the part with strong waist is suitable for distribution coating, and the part with weak waist is suitable for finish coating. It is.

  The hair material constituting the hair bundle portion 62 is preferably a mixture of pork hair (diameter 0.1 to 0.2 mm) at a rate of 20 to 40% and kanegoat (60 to 30 denier) at a rate of 80 to 60%. . When applying high-viscosity paint, if the hair is too soft, it is difficult to spread the paint evenly on the object to be coated. Appropriate waist strength is required, and by using the above-mentioned mixed hair, it is easy to apply and the finish is good.

  A controller 63 that controls the paint supply flow rate in the flexible tube 5 is attached to the applicator 6. The control unit 63 is a control valve that incorporates a needle valve 64. The control valve 63 includes an inlet port 65, and the flexible pipe 5 is connected to the inlet port 65. The valve 64 is biased to the closed side by coil springs 66a, 66b, 66c. When the lever 67 pivotally mounted against the spring force of the coil springs 66a to 66c is pushed, the valve 64 is separated from the valve seat and the flow path 70 is opened and inserted into the hair bundle portion 62. The paint is discharged from the nozzles 68 and 69.

  In the example shown in FIGS. 2 and 3, the lever 67 is disposed on the left side of the handle 61 in the vicinity of the hair bundle portion 62 and is easily operated with the thumb when the handle 61 is held with the right hand.

  The lever 67 can be arranged at an appropriate position. FIGS. 4 and 5 show an example in which the lever 67a is arranged on the upper part of the hair bundle part 62. FIG. 6 shows the lever 67b in the vicinity of the hair bundle part 62. Each example is shown on the ventral side of the handle 61. In any of the examples, the valve 64 is opened and closed by levers 67a and 67b as in the examples of FIGS.

  The control unit 63 is not limited to the needle type control valve, and may employ a solenoid valve, a roller clamp attached to a flexible tube, or other known control means.

  A method of coating using the coating apparatus having the above configuration will be described below.

  First, the lid body 13 is opened, the piston body 15 is taken out, and a viscosity of 5 to 50 Pa · s, preferably 15 to 20 Pa · s (Lion type rotational viscometer) is placed in the bottom side paint chamber 11 a of the cylindrical container body 11. A paint having a viscosity measured by

  As a paint used in the method of the present invention, a paint containing an epoxy resin (D) having two or more epoxy groups in one molecule, a scaly pigment (E), and an amine curing agent (F) is suitable. .

  The epoxy resin (D) is an epoxy resin having 2 or more, preferably 2 to 5, epoxy groups in one molecule. The epoxy resin (D) preferably has a number average molecular weight of about 350 to 3,000, more preferably about 400 to 1,500. Furthermore, the epoxy equivalent is preferably about 80 to 1,000, more preferably about 150 to 700.

  As an example of the said epoxy resin (D), the epoxy resin obtained by making a polyhydric alcohol, a polyhydric phenol, etc. react with excess epichlorohydrin or alkylene oxide can be mentioned. Examples of the polyhydric alcohol include ethylene glycol, polyethylene glycol, propylene glycol, neopentyl glycol, butylene glycol, hexanediol, glycerin, trimethylolethane, trimethylolpropane, pentaerythritol, diglycerol, sorbitol and the like. Examples of the polyhydric phenol include 2,2-bis (4-hydroxyphenyl) propane [bisphenol A], halogenated bisphenol A, 4,4-dihydroxyphenylmethane [bisphenol F], and tris (4-hydroxyphenyl). ) Propane, resorcin, tetrahydroxyphenyl ethane, novolac polyhydric phenol, cresol polyhydric phenol, and the like.

  Examples of other epoxy resins include 1,2,3-tris (2,3-epoxypropoxy) propane, phthalic acid diglycidyl ester, hexahydrophthalic acid glycidyl ester, tetrahydrophthalic acid glycidyl ester, and dimer acid glycidyl ester. , Tetraglycidylaminodiphenylmethane, 3,4-epoxy-6-methylcyclohexylmethyl carboxylate, triglycidyl isocyanurate, 3,4-epoxycyclohexylmethyl carboxylate, polypropylene glycol glycidyl ether and the like.

  The flake pigment (E) is a flaky pigment having an average thickness of about 0.1 to 15 μm and an average major axis of about 0.01 to 2 mm, and the peak of the particle size distribution is between 0.01 and 2 mm. Some are preferable for improving the anticorrosion performance. Examples of the flake pigment (E) include mica (mica), aluminum flakes, stainless steel flakes, and glass flakes, and these can be used alone or in combination of two or more. Among these, glass flakes can be preferably used particularly from the viewpoint of insulation resistance.

  The content of the flake pigment (E) is in the range of about 5 to 100 parts by weight, preferably about 10 to 70 parts by weight with respect to 100 parts by weight of the solid content of the resin (D). If the content is less than about 5 parts by weight, the permeation-preventing effect of corrosive factors such as moisture is lowered, and if it exceeds about 100 parts by weight, the viscosity of the paint becomes high and the cured coating film becomes brittle.

  The said amine type hardening | curing agent (F) is a hardening | curing agent of the said epoxy resin (D), and a conventionally well-known thing can be especially used without a restriction | limiting. The amine curing agent can be appropriately selected from those listed in the above description of the amine curing agent (F).

  The mixing ratio of the amine curing agent (F) is about 0.5 to 3.0 equivalents of active hydrogen in the amine curing agent (F) with respect to 1 equivalent of the epoxy group in the epoxy resin (D). In view of the curability and anticorrosion properties of the coating film, it is desirable that the ratio is preferably about 0.8 to 1.5 equivalents.

  If necessary, the paint may further include various pigments other than the flake pigment (E); the epoxy resin (D) such as petroleum resin, coumarone resin, xylene resin, toluene resin, ketone resin, and phenol resin. Various additives such as thickeners, plasticizers, fillers, pigment dispersants, ultraviolet absorbers, anti-settling agents, anti-sagging agents, reactive diluents and the like can be blended.

  Such paint is usually an organic solvent-type paint, and its solid content is about 50 to 97% by weight, preferably 70 to 95% by weight. As an organic solvent, the thing at the time of resin component manufacture may be sufficient, and you may add suitably for the purpose of solid content adjustment. Examples of the organic solvent include aromatic hydrocarbon solvents such as toluene, xylene, and mineral spirit; aliphatics such as n-hexane, n-heptane, n-octane, n-decane, n-dodecane, cyclopentane, and cyclohexane. Hydrocarbon solvents; ketone solvents such as acetone, methyl ethyl ketone, methyl isobutyl ketone and diisobutyl ketone; ester solvents such as ethyl acetate, n-butyl acetate and isobutyl acetate; alcohol solvents such as ethyl alcohol, propyl alcohol and butyl alcohol Glycol solvents such as ethylene glycol, diethylene glycol, propylene glycol and hexylene glycol; glycol ether acetates such as methyl ether, ethyl ether, propyl ether and butyl ether of these glycol solvents And conventionally known solvents glycol monoethyl ether, such as propionate may be used.

  Such a paint is usually a two-component paint comprising a paint base containing components other than the amine-based curing agent (F) and a curing agent containing the amine-based curing agent (F). And a curing agent are mixed and used. The pot life after mixing is usually about 0.5 to 6 hours at 20 ° C. Further, such a paint is a room temperature curing paint.

  When carbon dioxide gas is used as the compressed gas, it is preferable to add the water-soluble alcohol or a mixed solution of water-soluble alcohol and water into the top side compressed gas chamber 11b after filling the paint. Examples of the water-soluble alcohol include ethyl alcohol and isopropyl alcohol. When carbon dioxide is used, when the polyamide resin contained in the paint curing agent and carbon dioxide come into contact with each other, a paint lump is formed instantaneously from the galvanic acid compound. There is a possibility that the coating lump (galvanic acid compound) is dispersed in the coating material, resulting in poor coating. In addition, the coating lump causes clogging of the nozzles 68 and 69 of the application unit 6, causing a discharge failure of the coating material from the application tool 6, and the valve of the needle valve 64 and the needle valve 64 of the application tool 6. There is a possibility that the needle valve 64 cannot be closed by being sandwiched between the seat and the discharge of the paint cannot be stopped. Therefore, as described above, the container body 11 is filled with paint, the piston body 15 is inserted into the container body 11 and placed on the paint surface, and then alcohol or alcohol and water are placed on the piston body 15. If the mixed solution is stretched, the crystallized galvanic acid compound can be dissolved. In this embodiment, an appropriate amount blended with isopropyl alcohol: water = 80: 20 is added into the container body 11.

  After the lid 13 is closed, the set pressure of the pressure regulator 4 is set so that the discharge flow rate of the paint from the backpack-type paint tank 2 to the applicator 6 is 500 to 2000 g / min, preferably 900 to 1500 g / min. Adjust. In the illustrated example, the set pressure of the pressure regulator is adjusted within a range of 0.1 to 0.5 MPa, and the compressed gas is supplied into the top side compressed gas chamber 11 b in the pressurized gas cylinder 3.

  The lever 67 of the control unit 63 is operated, the needle valve 64 is opened, and the surface to be painted is painted while discharging the paint from the nozzles 68 and 69. If the above-mentioned high-viscosity paint is discharged at the above-described flow rate, a film thickness of 450 μm or more can be ensured as the coating thickness immediately after coating if the worker performs the application work at a speed that normally carries the brush.

  When the paint in the container body 11 runs out, the on-off valve 7 is closed by operating it, the supply of compressed gas to the container body 11 is stopped, and the relief valve 8 is opened to release the compressed gas in the container body 11. Thereafter, the lid body 13 is opened, the handle portion 21 of the piston body 15 is gripped and pulled out from the container body 11, and the paint is replenished. Then, when the piston body 15 is accommodated again, the lid body 13 is closed, and the opening / closing valve 2 is operated and opened, the gas pressure sent to the container body 11 by the action of the pressure regulator 4 and the relief valve 8 becomes a predetermined pressure. Once again, painting can be performed.

  According to the coating apparatus having the above-described configuration, the piston body 15 accommodated in the paint tank 2 prevents the compressed gas from leaking through the paint supply flexible tube 5, while the handle portion 21 is provided. Therefore, it can be easily taken out from the top opening of the container body 11 and the paint can be replenished. The paint in the container body 11 is efficiently pumped even if it is a high viscosity paint because the weight of the paint and the load of the piston are added in addition to the pressing force by the compressed gas. As a result, even with the high-viscosity paint as described above, it was possible to secure a film thickness (wet state) of 450 μm or more once applied, and to ensure a coating film thickness of 340 μm or more after drying.

  Since the applicator 6 has its side trimmed diagonally, when spreading the paint on the surface to be coated, the paint discharged from the central part of the brush was spread evenly in the part near the relatively strong root and then trimmed. Finish using the part. At that time, if the brush is finished upright with respect to the object to be painted, the paint is scraped off with the brush, the film thickness becomes thin, and when the brush is laid down according to the cutting, the paint will follow the inclined surface. The flow and the target film thickness can be ensured, and the paint can be finished without accumulating in the hair bundle portion, and a smooth coating surface is formed.

  FIG. 7 shows another form of the applicator. The bristle material at the end of the hair bundle portion 62 in the hair width direction (left-right direction in FIG. 7) is trimmed so that the hair length becomes shorter as it goes from the inside to the outside of the hair bundle portion 62.

Tuft 62, trim angle theta ₂ to 30 to 85 °, preferably between 60-80 °, from the bristles end position of the bristle width direction central portion until the bristles end position of the shortest bristle length in hair width direction outermost it is preferable that the distance _{(H 2)} and 20 to 40 mm.

  By forming the trim at the ends in the width direction of the hair as described above, when vertical coating (application by movement in the left-right direction in FIG. 7) is performed, the paint flows along the trimmed inclined portion, resulting in a good finish Can be obtained. Moreover, it can paint effectively with respect to a thin member.

  Next, a second embodiment of the coating apparatus according to the present invention will be described with reference to FIGS. FIG. 8 shows a conceptual diagram of the coating apparatus. FIG. 9 shows the internal state of the paint tank, FIG. 9 (a) shows a state in which the piston body is placed on the filled paint, and FIG. 9 (b) shows a cover with a compression spring placed on the piston body. FIG. 9C shows a state immediately after the body is closed, and an internal state of the paint tank after the paint is discharged. In FIG. 9, the code | symbol P shows a coating material.

  In the coating apparatus according to the second embodiment, the compression spring 9 is accommodated in the top side compressed gas chamber 11 b, and the end of the compression spring 9 presses the upper portion of the piston body 15.

  The compression spring 9 is pressed against the paint surface via the piston body 15. As a result, it is possible to prevent the piston body 15 from being tilted when the container body 11 is tilted.

  Such a compression spring 9 is a piston with a force of 0.5 to 30 N, preferably 1.0 to 20 N in the state of FIG. 9B in which the compression spring 9 is most compressed in the container body 11. In the state shown in FIG. 9C in which the body 15 is pushed and the compression spring 9 is extended most in the container body 11, the piston body 15 is pushed with a force of 0.5 N or more, preferably 2.5 N or more. preferable. This is because, when the pressing force of the compression spring 9 exceeds 30 N in the state of FIG. 9B, it becomes difficult to insert the spring 9 into the paint tank. Further, the pressing force of the compression spring 9 from the state of FIG. 9B to the state of FIG. 9C needs to be maintained at 0.5N or more, preferably 2.5N or more. This is because, when the pressure is 0.5 N or less between FIG. 9B and FIG. 9C, when the paint tank is tilted, the piston body in the container is also tilted and the compressed gas leaks.

  The piston body 15 is made of an elastic material and has flexibility. As a result of the flexibility of the piston body 15, as shown in FIGS. 8 and 9, the upper portion of the container body 11 has a tapered shape such as a conical shape, a truncated cone shape, or a hemispherical shape. Even if the top opening 11c has a diameter smaller than that of the body portion, it can be inserted into the container body 11 by bending the piston body 15. The elastic material for forming the piston body 15 is not particularly limited as long as it is a flexible rubber material, and for example, a bind rubber or a silicone resin can be adopted.

Moreover, the piston body 15 can be made into a suction cup shape, as shown in FIGS. The suction cup-like piston body 15 is elastically deformed into a flat shape by receiving pressure from compressed air and pressing force from the compression spring 9 in the container main body 11, and as a result, the outer diameter increases. Accordingly, the outer diameter D ₁₅ (FIG. 9A) when the piston body 15 is sucked is set to be slightly smaller than the inner diameter D ₁₁ of the cylindrical portion of the container body ₁₁ (FIG. 9A). Thus, it is possible to improve the sealing performance with the inner wall surface of the container body 11. Furthermore, the piston body 15 has a suction cup shape, so that after the paint in the container body 11 is used up, the piston body 15 is adsorbed on the bottom surface of the container body 11, closes the paint discharge port 10, and no paint remains in the container body 11. Can be used up.

Further, if the outer diameter D ₁₅ of the sucker-like piston body 15 is slightly smaller than the inner diameter D ₁₁ of the cylindrical portion of the container body 11, the following effects are also achieved. When the original outer diameter of the piston body 15 is set to be close to the inner diameter of the container body 11, whether it is flat or sucker-shaped, when the piston body 15 is inserted into the container body 11, Although the peripheral edge of the piston body 15 is caught by the weak frictional contact with the inner wall surface of the container main body 11, it may be difficult to insert the piston body 15 horizontally with respect to the paint surface of the container main body 11. If the suction cup is formed with an outer diameter slightly smaller than the inner diameter, the piston body 15 can be easily inserted into the container body 11 without receiving frictional resistance from the inner wall of the container body 11.

  When it is difficult to peel off the suction cup-like piston body 15 adsorbed on the bottom surface of the container body 11, the handle portion 21 of the piston body 15 is attached to the piston body 15 as shown in FIG. By providing in the vicinity of the periphery, the suction cup-like piston body 15 attached to the bottom of the container body 11 can be easily peeled off from the container body 11.

  Further, the bottom of the container body 11 is tapered as shown in FIGS. 8 and 9 by forming the piston body 15 of an elastic material so as to be flexible or sucking. In this case, it is possible to follow the shape of the bottom surface of the container main body 11 and use up all the paint.

  When the upper part of the container body 11 is tapered and the top opening 11c is smaller in diameter than the body part of the container body 11, the compression spring has a winding diameter at both ends smaller than the other parts. The outer diameter of both ends of the small diameter is designed to be smaller than the inner diameter of the top opening 11c. By designing the shape of the compression spring 9 in this way, the compression spring 9 can be easily taken in and out of the container main body 11. Therefore, the piston body 15 can also be taken in and out of the container main body 11 for paint replacement.

  The inner diameter of the top opening 11c is desirably large enough for an adult's arm to enter. Further, the lower end portion of the compression spring 9 may be connected to the handle portion 21 of the piston body 15.

  FIG. 10 is a third embodiment showing a modification of the second embodiment. The shapes of the container body 11 and the compression spring 9 are different. The container body 11 of the third embodiment has a cylindrical shape whose top and bottom are flat. For this reason, the compression spring 9 also has a cylindrical contour having the same winding diameter over the entire length, but the other configuration is the same as that of the second embodiment, and thus detailed description thereof is omitted.

It is a conceptual diagram which shows 1st Embodiment of the coating device which concerns on this invention. It is a side view which expands and shows the applicator of the coating device of FIG. It is a front view of the applicator of FIG. It is a side view which shows other embodiment of an applicator. It is a front view of the applicator of FIG. It is a side view which shows other embodiment of an applicator. It is a side view which shows other embodiment of an applicator. It is a conceptual diagram which shows 2nd Embodiment of the coating device which concerns on this invention. It is sectional drawing which expands and shows the principal part of 2nd Embodiment. It is a conceptual diagram which shows 3rd Embodiment of the coating device which concerns on this invention. It is a front view which shows the use condition of the conventional brush.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Coating device 2 Paint tank 3 Gas cylinder 4 Pressure regulator 5 Flexible pipe 6 Applicator 9 Compression spring 11 Cylindrical container main body 62 Hair bundle part

Claims (15)

A coating device suitable for thick film coating of high-viscosity paint,
A backpack-type paint tank provided with a compressed gas injection port at the top, a pressure regulator for adjusting the supply pressure of the compressed gas, and an applicator connected to the backpack-type paint tank by a flexible pipe for paint supply Have
The paint tank includes a shoulder-type cylindrical container body provided with a paint discharge port on the bottom surface, a lid body that is airtightly attached to the top opening of the container body, and is slidable within the container body. A coating apparatus comprising: a piston body that is contained and partitions the inside of the container body into a bottom-side paint chamber and a top-side compressed gas chamber. The coating apparatus according to claim 1, wherein the piston body is accommodated so as to be removable from a top opening of the container body. The coating apparatus according to claim 2, further comprising a handle portion for taking out from the container body. The coating apparatus according to claim 1, wherein the piston body is made of an elastic material and has flexibility. The coating apparatus according to claim 1, wherein the piston body has a sucker shape. The coating apparatus according to claim 1, wherein a compression spring is accommodated in the top side compressed gas chamber, and an end portion of the compression spring presses an upper portion of the piston body. The coating apparatus according to claim 6, wherein the compression spring is configured to press the piston body with a force of 0.5 to 30 N. The applicator includes a handle, and a hair bundle portion in which a base of a hair material is bundled in a rectangular shape and bound and fixed to the handle, and the flexible tube is connected to receive paint supply, The coating material according to claim 1, wherein the bristle material on both sides in the thickness direction of the hair bundle part is trimmed obliquely so that the hair length becomes shorter from the inside to the outside of the hair bundle part. apparatus. The coating material according to claim 8, wherein the bristle material at the end in the hair width direction of the hair bundle part is trimmed obliquely so that the hair length becomes shorter as it goes from the inside to the outside of the hair bundle part. apparatus. The applicator includes a stick-like handle, a hair bundle portion in which a base of a hair material is bundled in a rectangular shape and bound and fixed to the handle, and the flexible tube is connected to receive paint supply, A control unit that is attached to a handle and controls the supply of paint to the hair bundle unit, and the control unit includes a control valve and a lever that controls the control valve, and the lever includes a hair bundle. The coating apparatus according to claim 1, wherein the coating apparatus is disposed in the vicinity of the portion and at a side portion position of the handle. The applicator includes a stick-like handle, a hair bundle portion in which a base of a hair material is bundled in a rectangular shape and bound and fixed to the handle, and the flexible tube is connected to receive paint supply, A control unit that is attached to a handle and controls the supply of paint to the hair bundle unit, and the control unit includes a control valve and a lever that controls the control valve, and the lever includes a hair bundle. The coating apparatus according to claim 1, wherein the coating apparatus is disposed in the vicinity of a portion and at a position on the ventral side of the handle. The applicator includes a stick-like handle, a hair bundle portion in which a base of a hair material is bundled in a rectangular shape and bound and fixed to the handle, and the flexible tube is connected to receive paint supply, A control unit that is attached to a handle and controls the supply of paint to the hair bundle unit, and the control unit includes a control valve and a lever that controls the control valve, and the lever includes a hair bundle. The coating apparatus according to claim 1, wherein the coating apparatus is disposed at an upper position of the portion. A coating method using the coating apparatus according to any one of claims 1 to 12,
A paint having a viscosity of 5 to 50 Pa · s is accommodated in the bottom paint chamber of the cylindrical container body,
Adjusting the pressure of the compressed gas supplied to the backpack-type paint tank by the pressure regulator so that the discharge flow rate of the paint from the backpack-type paint tank to the applicator is 500 to 2000 g / min,
A coating method, wherein a coating is applied to a surface to be coated with the applicator. 14. The coating according to claim 13, wherein carbon dioxide is used as the compressed gas, and a water-soluble alcohol or a mixture of water-soluble alcohol and water is added to the top side compressed gas chamber at the top of the piston body. Method. The paint contains an epoxy resin (D) having two or more epoxy groups in one molecule, a scaly pigment (E), and an amine curing agent (F), and the scaly pigment (E) The coating method according to claim 13 or 14, wherein the content of is a coating of 5 to 100 parts by weight with respect to 100 parts by weight of the solid content of the resin (D).

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