JP3421435B2 - Painting method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating method for automobiles and the like.

[0002]

2. Description of the Related Art For example, when painting an automobile in two colors,
Painting is done by protecting the differently painted part with a masking material. Conventionally, as such a masking material, a plastic molding such as polyethylene or polypropylene to which a filler is added has been used (JP-A-2-126966 or JP-A-5-7807). Since the masking material has heat resistance due to the reinforcing effect of the filler, it can withstand the heat treatment in the coating process and can be repeatedly used for a certain number of times. Further, in order to further improve the heat resistance of the masking material and increase the number of times of repeated use, a material made of engineering plastic has recently been provided (JP-A-5-261323). As shown in FIG. 12, the back surface of the masking material (1) is coated with a pressure sensitive adhesive, and the masking material (1) is attached to a predetermined portion (3) of the coated surface by the pressure sensitive adhesive coating layer (2).

[0003]

However, since engineering plastics have a high softening point and poor moldability, molding may be difficult depending on the shape of the masking material.
Furthermore, since engineering plastics have high hardness and are easily damaged by a large impact, even if they have excellent heat resistance, they may not be able to be used repeatedly many times due to damage. Also, when the masking material is attached to a predetermined place by the adhesive coating layer, the adhesive coating layer deteriorates due to the heat treatment in the coating process, and the main body is in a state in which it can be repeatedly used. There is a problem that it cannot be used repeatedly due to deterioration of the coating layer.

[0004]

As a means for solving the above-mentioned conventional problems, the present invention uses a polymer alloy of an engineering plastic and a thermoplastic resin as a material in a predetermined portion of an object to be coated made of a steel material. A masking material is brought into contact, a magnet is applied from above, and the masking material is temporarily fixed, then the masking material is fixed with an adhesive tape, then the surface of the object to be coated is coated, and after the coating, a heat treatment is carried out before the adhesive tape. And a magnet layer is attached to the back surface of a masking material made of a polymer alloy of an engineering plastic and a thermoplastic resin, and the masking material is made of a steel material. Is attached to a predetermined position of the through the magnet layer,
Then, the surface of the object to be coated is coated, and after the coating, heat treatment is performed.
To provide a coating method for removing the masking material together with the magnet layer from the predetermined position, the polymer alloy is preferably a polymer alloy of polyphenylene oxide and polyamide, and the masking material is preferably in the longitudinal direction. It is divided into two parts and they overlap each other
It is attached to a predetermined portion of the object to be coated so as to be fitted to each other.

As described above, the masking material of the present invention is made of the polymer alloy of engineering plastic and thermoplastic resin. Examples of the engineering plastic include polyamide (PA), polyacetal (POM), polycarbonate (PC), glass fiber reinforced polyethylene terephthalate (GF-PET), polybutylene terephthalate (PBT), polyphenylene ether (PPE, polyphenylene oxide (PP).
O)), polysulfone (PSF), polyether sulfone (PES), polyphenylene sulfide (PPS),
Polyarylate (PAR), polyetheretherketone (PEEK), crystalline polyester, polyamideimide (PAI), polyimide (PI), polyetherimide (PEI), polyaminobismaleimide, methylpentene copolymer (TPX), cellulose acetate ( C
A) or the like thermoplastic type, polyallyl ether or the like liquid crystal type, fluororesin or the like compression molding type, amorphous polymer, polyamino bismaleimide, bismaleimide-
Examples include triazine-based thermosetting aromatic polyimide.

[0006] upper disappeared engineering plastics thermoplastic resin as the a, for example, polyethylene which is mixed, polypropylene, ethylene - propylene copolymer, ethylene - vinyl acetate copolymer, polyvinyl chloride, polyvinylidene chloride, polystyrene, poly Vinyl acetate, fluororesin, thermoplastic acrylic resin, thermoplastic polyester, thermoplastic polyamide, thermoplastic urethane resin, acrylonitrile-butadiene copolymer, styrene-butadiene copolymer, acrylonitrile-butadiene-styrene copolymer, ethylene-propylene There are copolymers, ethylene-propylene terpolymers, ethylene-vinyl acetate copolymers and the like. The thermoplastic resin may be a copolymer of a monovalent and / or polyunsaturated carboxylic acid and / or its anhydride.

Preferable polymer alloys for the present invention are, for example, PPO-high impact polystyrene polymer alloy, PPO-polyamide polymer alloy and PPO.
PO-polyamide-high impact polystyrene polymer alloy, PPO-polyamide-polystyrene polymer alloy, PPO-PTFE polymer alloy, PE-high impact polystyrene polymer alloy, PE-polyamide polymer alloy, polyamide-modified polyolefin polymer alloy, polyamide-acrylonitrile / styrene / Butadiene copolymer (ABS) polymer alloy,
Polyamide-PTFE polymer alloy, PBT-acrylic rubber polymer alloy, PBT-ABS polymer alloy, PBT-polyester ether elastomer polymer alloy, PBT-PET polymer alloy, PBT-P
C polymer alloy, PBT-PTFE polymer alloy,
PET-PTFE polymer alloy, PET-PAR polymer alloy, PC-PTFE polymer alloy, PAR-
Examples thereof include PTFE polymer alloys and POM-thermoplastic polyurethane polymer alloys, and the above polymer alloys may be used as a mixture of two or more kinds, or may be a foam. Among these polymer alloys, a polymer alloy of PPO, polyamide and polystyrene, a polymer alloy of PPO, polyamide and high impact polystyrene, or a polymer alloy of PPO and polyamide is particularly preferable. Examples of the polyamide used for the polymer alloy with PPO include polytetramethylene adipamide (nylon 4: 6), polyhexamethylene adipamide (nylon 6: 6), polypyrrosodone (nylon 4), polycaprolactam (nylon). 6),
Polyheptolactam (nylon 7), polycaprylactam (nylon 8), polynonanolactam (nylon 9), polyundeca 1 lactam (nylon 11), polydodeca 1 lactam (nylon 12), polyhexamethylene azelainamide (nylon 6: 9), polyhexamethylene sebacamide (nylon 6:10), polyhexamethylene phthalamide (nylon 6: iP), polyhexamethylene terephthalamide, polyhexamethylene isophthalamide, polytetramethylene isophthalamide, polymethaxylene azide Pamide (nylon MSD: 6), polyamide of hexamethylenediamine and n-dodecanedioic acid (nylon 6:12), polyamide of dodecamethylenediamine and dodecanedioic acid (nylon 12:12), hexamethyleneadipamide / Caprolactam (nylon 6: 6
/ 6), hexamethylene adipamide / hexamethylene isophthalamide (nylon 6: 6 / 6iP), hexamethylene adipamide / hexamethylene-terephthalamide (nylon 6: 6 / 6T), trimethylhexamethylene oxamide / hexa Methylene oxamide (nylon trimethyl-6: 2/6: 2), hexamethylene adipamide / hexamethylene-azelaiamide (nylon 6: 6 /
6: 9), hexamethylene adipamide / hexamethylene-azelaiamide / caprolactam (nylon 6: 6 /
6: 9/6), poly (caproamide / hexamethylene sebacamide) (nylon 6: 610), poly (caproamide / hexamethylene dodecamide) (nylon 6:61
2, nylon MXD6), poly (caproamide / hexamethylene isophthalamide) (nylon 6: 6I), aromatic polyamide, and the like, and particularly preferable polyamides include nylon 6, nylon 11, nylon 12,
Examples include nylon 66 and nylon 46.

In the present invention, rubber and / or elastomer may be further added in addition to the above engineering plastic and thermoplastic resin. Examples of the rubber and / or elastomer include polyester, polyacrylic acid ester, acrylic rubber (AR), butyl rubber, silicon rubber, urethane rubber (UR), fluoride rubber, polysulfide rubber, graft rubber, butadiene rubber. (BR), polybutadiene-isoprene rubber, isoprene rubber (IR), chloroprene rubber (CR), polyisobutylene rubber (IBR), polybutene rubber, thiochol rubber, polysulfide rubber, polyether rubber, epichlorohydrin rubber, norbornene terpolymer, Hydroxy- or carboxy-terminal modified polybutadiene, partially hydrogenated styrene-butadiene block copolymer, chlorosulfonated rubber, isobutene-isoprene rubber (IIR), acrylate-butadiene rubber (ABR), styrene-butadiene Beam (SBR), styrene - chloroprene rubber (SC
R), acrylonitrile-butadiene rubber (NBR),
Acrylonitrile-chloroprene rubber (NCR), pyridine-butadiene rubber, styrene-isoprene rubber (S
IR), styrene-butadiene-styrene block copolymer (SBS), styrene-isoprene-styrene block copolymer (SIS), α-methylstyrene-butadiene-α-methylstyrene block copolymer (α-MeS)
-Bd-MeS), α-methylstyrene-isoprene-α
-Styrene-based thermoplastic elastomers such as methylstyrene block copolymers, styrene-hydrogenated polyolefin-styrene (SEBS) copolymers, blocks such as butadiene-styrene block copolymers, styrene-rubber intermediate blocks-styrene copolymers There are copolymers and the like, ethylene-styrene copolymer, ethylene-propylene copolymer (EP), ethylene-propylene-ethylidene norbornene copolymer rubber as ethylene-propylene-ethylidene copolymer, ethylene-butene-1- Ethylidene norbornene copolymer rubber, ethylene-propylene-diene copolymer ethylene-propylene-dicyclopentadiene copolymer rubber, ethylene-propylene-1,4 hexadiene copolymer rubber, ethylene-butene-1-dicyclopentadiene Polymer rubber, an ethylene - butene-1
As the copolymer rubber, there are synthetic rubber such as polyolefin rubber such as ethylene-butene-1-1,4 hexadiene copolymer rubber and natural rubber, and the one having a softening point of 150 ° C. or lower is desirable, and also contains a carboxyl group. You can leave.
Two or more kinds of the above rubbers and / or elastomers may be mixed and used.

Calcium carbonate, magnesium carbonate,
Barium sulfate, calcium sulfate, calcium sulfite, calcium phosphate, calcium hydroxide, magnesium hydroxide, aluminum hydroxide, magnesium oxide, titanium oxide, iron oxide, zinc oxide, alumina, silica, diatomaceous earth,
Inorganic fillers such as dolomite, gypsum, talc, clay, asbestos, mica, glass fiber, calcium silicate, bentonite, white carbon, carbon black, iron powder, aluminum powder, stone powder, blast furnace slag, fly ash, cement, zirconia powder , Natural fibers such as cotton, hemp, wool, polyamide fibers, polyester fibers, acrylic fibers, viscose fibers, acetate fibers, vinyl chloride fibers, vinylidene chloride fibers and other organic synthetic fibers, asbestos fibers, glass fibers, carbon fibers, ceramics Fiber, metal fiber, inorganic fibers such as whiskers, linters, linen, sisal, wood flour, palm flour, walnut flour, starch, shape retention and dimensional stability by adding reinforcing agents such as organic fillers such as wheat flour, It may be improved in compression and tensile strength, and may be flame retardant, flame retardant, insect repellent. , Preservatives, lubricants, anti-aging agents, antioxidants, ultraviolet absorbers, antistatic agents, crystallization accelerators, chemical foaming agents, foaming agents such as capsule-type foaming agents, coloring agents such as dyes and pigments, DOP, You may add plasticizers, such as DBP.

In the present invention, the thermoplastic resin is added in an amount of 1 to 200% by weight in the polymer alloy, or in the case of adding a synthetic rubber or an elastomer, in an amount of about 1 to 150% by weight in the polymer alloy and a filler. When it is added, it is added in an amount of about 1 to 200% by weight in the polymer alloy.

In order to produce the masking material of the present invention, the above-mentioned polymer alloy sheet is formed mainly by vacuum molding, press molding, blow molding or the like into a shape suitable for the shape of a predetermined portion (masking portion) of the surface to be coated. , Or by casting the pellets of the polymer alloy into the above shape,
A method of manufacturing by injection molding or the like is adopted. Further, an adhesive may be applied to a part or the whole surface of the masking material, if necessary.

[0012]

In the present invention, since a thermoplastic resin is added to the engineering plastic, the thermoplastic resin imparts flexibility to the engineering plastic, and the molding workability and brittleness are maintained without lowering the heat resistance. Can be improved. Further, in the present invention, since the magnet is used for temporarily fixing or attaching the masking material, the temporary fixing or attaching means does not deteriorate.

[0013]

1 to 5, a first embodiment of the present invention is shown. In the figure, (11) is a masking material for protecting the side sill (13) of the vehicle body (12) shown in FIG.
A vacuum molded product of a sheet made of a polymer alloy made of a mixture of PO, nylon 66 and SBR in a 95: 4: 1 weight ratio. Further, (14) is a masking material for protecting the side panel (15) of the vehicle body (12) shown in FIG.
A vacuum molded product of a sheet made of a polymer alloy made of a mixture of PS, high-impact polystyrene and chloroprene in a 92: 7: 1 weight ratio.

In the first coating step, as shown in FIG. 2, first, the masking material (11) is applied to the side sill (13) of the vehicle body (12).
Then, the permanent magnets (16, 16) are attached from above and temporarily fixed, and then fixed by an adhesive tape (17) as shown in FIG. After the masking material (11) is attached to the side sill (13) in this manner, a first coating of a predetermined color is applied to the vehicle body (12). After coating, heat treatment is performed at a predetermined temperature for a predetermined time, for example, 180 ° C. for 5 minutes. Next, in the second painting step, the masking material (11) attached to the side sill (13) of the vehicle body (12) is removed, and the masking material (14) is attached to the side panel (15) of the vehicle body (12). After abutting, as shown in FIG. 4, permanent magnets (18, 18) are attached from above and temporarily fixed, and then fixed by adhesive tapes (19, 19) as shown in FIG. In this way, the masking material (11) is attached to the side panel.
After being attached to the (15), a second coating having a color different from the first coating is applied to the side sill (13) of the vehicle body (12). After the coating, the same heat treatment as the first coating is performed, and then the masking material (14) is removed.

As seen in the above coating process, the masking material
Although the (11,14) is removed after the heat treatment in which the fluidity of the coating film formed by the coating disappears, the masking material (11,14) is hardly deformed or altered during the heat treatment. Therefore, the masking material (11, 14) withstands repeated use at least several times.

A second embodiment of the present invention is shown in FIGS. 6 and 7. In this embodiment, the masking material (11A, 11B) for protecting the side sill (13) of the vehicle body (12) is the masking material (11) of the previous embodiment divided into two parts, and as shown in FIG. (11A, 11B) are electromagnets (20, 2
It is temporarily fixed to the side sill (13) by 0). At this time, the masking materials (11A, 11B) are slightly overlapped with each other. Then, as shown in FIG. 7, it is fixed by an adhesive tape (21). In this way, the masking material (11) is attached to the side sill (13) and then the first coating is applied. In this embodiment, since the masking material (11A, 11B) obtained by dividing the long masking material (11) of the previous embodiment into two is used, thermal deformation in the longitudinal direction of the masking material (11A, 11B) during heat treatment ( Growth)
Can be absorbed by the overlapping portion (11C) of the masking material (11A, 11B). Further, the masking material (11A, 11B) that has undergone the thermal deformation
However, it can be reused by increasing the width of the overlapping part (11C).

FIGS. 8 to 11 show a third embodiment of the present invention. The masking material (22) shown in the figure is the car body (12).
Is a vacuum formed product of a sheet made of a polymer alloy made of a mixture of PPO and nylon 6 in a weight ratio of 90:10. A shielding wall (23) is formed on the upper surface of the masking material (22) along the longitudinal direction, and a plurality of reinforcing ribs (24) are provided on both sides of the shielding wall (23). Longitudinal reinforcing ribs (25) are provided on one side of (23), and magnet mounting recesses (26, 27) in which plate-shaped plastic magnets (28, 29) are fitted are formed on the back side. There is. As shown in FIGS. 10 and 11, the masking material (22) is attached below the edge of the bonnet (30) in the opened state via magnets (28, 29), and is moved from the arrow direction in FIG. 11 to the fender (31). On the other hand, when spray painting is performed, the shielding wall (23) of the masking material (22) prevents the paint splash from covering the bonnet (30).

[0018]

As described above, according to the present invention, the masking material used for coating can be repeatedly used. In this way, the amount of scraps generated can be reduced, and in terms of resources and economy,
A highly preferred method is provided.

[Brief description of drawings]

1 to 5 show a first embodiment of the present invention.

FIG. 1 is an explanatory perspective view before attaching a masking material.

FIG. 2 is a perspective view of the masking material temporarily fixed in the first coating process.

FIG. 3 is a perspective view of a masking material attached state in the first painting process.

FIG. 4 is a perspective view of the masking material temporarily fixed in the second coating process.

FIG. 5 is a perspective view of a masking material attached state in the second coating step. FIGS. 6 and 7 show a second embodiment of the present invention.

FIG. 6 is a perspective view of the masking material temporarily fixed in the first painting step.

FIG. 7 is a perspective view of a masking material attached state in the first painting step. FIGS. 8 to 11 show a third embodiment of the present invention.

FIG. 8: Plan view of masking material

FIG. 9: Back view of masking material

FIG. 10: AA in FIG. 8 with the masking material attached
Cross section

FIG. 11 is a partial perspective view of a masking material attached state.

FIG. 12 is an explanatory sectional view of a conventional example.

[Explanation of symbols]

11,14,11A, 11B, 22 Masking material 12 Car body (object to be coated) 13 Side sill (specified location) 15 Side panel (predetermined place) 17,19,21 Adhesive tape 18,28 magnet 20 Electromagnet (magnet) 29 Plastic magnet (magnet layer) 30 bonnet (predetermined place)

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-3-193162 (JP, A) JP-A-6-134387 (JP, A) Actually open 63-35464 (JP, U) Actually open 51- 59467 (JP, U) (58) Fields surveyed (Int.Cl. ⁷ , DB name) B05D 1/32 B05B 15/04 102 B05D 7/14

Claims (4)

(57) [Claims] 1. A masking material made of a polymer alloy of an engineering plastic and a thermoplastic resin is brought into contact with a predetermined portion of an object to be coated made of a steel material, and a magnet is applied from above the masking material to temporarily fix the adhesive. A method for coating, characterized in that the masking material is fixed by a tape, then the surface of the article to be coated is coated, and after the coating, heat treatment is performed, the adhesive tape is removed, and the masking material is removed from the predetermined location. 2. A magnet layer is attached to the back surface of a masking material made of a polymer alloy of engineering plastic and thermoplastic resin, and the masking material is attached to a predetermined portion of a coated object made of a steel material through the magnet layer. Mounting, then coating the surface of the article to be coated, after the coating, heat-treating , and then removing the masking material together with the magnet layer from the predetermined location. 3. The coating method according to claim 1, wherein the polymer alloy is a polymer alloy of polyphenylene oxide and polyamide. 4. The masking material is divided into two in the longitudinal direction.
And a specified number of objects to be coated so that they overlap each other slightly.
The coating method according to claim 1 or 2, which is installed at a place.