JPH11172156A - Oil face coating type rust preventing agent composition and rust prevention - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an oil face coating type rust preventing agent composition for imparting various steel plates and aluminum alloy plates stuck with a press oil and a rust preventing oil with excellent rust preventing properties and to provide a method for preventing corrosion. SOLUTION: This oil face coating type rust preventing composition comprises (A) 100 pts.wt. of a liquid epoxy resin derived fro bisphenol A and/or bisphenol F, (B) 50-600 pts.wt. of a component composed of a reactive diluent and a phosphoric ester-based plasticizer, (C) 1-100 pts.wt. of a conductivity imparter, (D) 10-200 pts.wt. of a powder polymer composed of an acrylate and (E) 5-80 pts.wt. of an epoxy resin curing agent. The method for rust prevention comprises coating a material to be coated with the oil face coating type rust preventing composition in 50-400 μm thickness, primarily heating the material at >=80 deg.C and <150 deg.C and further secondarily heating at 150-200 deg.C.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating type rust preventive composition, and more particularly to a coating type rust preventive composition containing a one-pack type thermosetting epoxy resin. That is, the present invention relates to a coating type rust-preventive composition having excellent rust-preventing properties and good spot-welding properties after coating by being applied to various steel plates or various aluminum alloys to which press oil or rust-preventive oil has adhered. More particularly, the present invention relates to an oil-coated rust preventive composition which can be used as a rust preventive for ordinary steel sheets for automobiles, and a rust preventive method therefor.

[0002]

2. Description of the Related Art Hitherto, improvement of rust resistance of an automobile body has been required, and accordingly, a portion required to have high rust resistance, for example,
Steel plates used for fenders, doors, hoods, body sides, etc. are various types of steel with high rust resistance, such as galvanized steel plates, zinc-nickel plated steel plates, and steel plates coated with an organic coating on plated steel plates. Rust-proof steel plate is used.

In recent years, however, improvements in vehicle body structures, electrodeposition paints,
By improving the coating method, the throwing power of the paint has been improved,
For example, in the case of a body side panel, only a sill called a bag structure, which is difficult to paint due to the vehicle body structure, is required to have a rust-proofing steel plate. Therefore, in such a case,
There is a method of using rust-prevention-treated steel sheets only for the necessary parts. However, in many cases, a method of dividing and joining the plates is used for design reasons. In practice, many vehicles use excessively rust-prevention-treated steel plates, resulting in great waste. In order to reduce waste, it is conceivable to apply a rust preventive to only a necessary portion of the ordinary steel sheet and perform a rust preventive treatment.

[0004] Several materials have been invented that are believed to be usable in this application. For example, a mixture of a urethane-modified epoxy resin and a latent curing agent mixed with a rust-preventive pigment or metal powder (Japanese Patent Application Laid-Open No. 60-206882), a specific rubber-modified epoxy resin, an aromatic epoxy resin, and a latent curing agent having a conductive property. Compounded with carbon black (JP-A-62-5
3387), a mixture of a mixture of a urethane-modified epoxy resin and a rubber-modified epoxy resin, and a latent curing agent mixed with a specific rust-preventive pigment (JP-A-1-41971).

However, these materials have been invented for use as an adhesive, and do not always satisfy the requirements as an applicable rust preventive. The most important thing as a coating type rust preventive is to secure the rust preventive property of the base material. As a result, a uniform thin film such as paint can be easily applied to the base material without repelling on the steel plate to which the oil has adhered, and entanglement voids during application and voids due to evaporation of low molecular weight components which cause rusting Is required to be able to be filled or covered.

Even if it is intended to apply the above-mentioned material evenly to a film thickness of, for example, 300 μm or less, since it has been developed as a high-viscosity product which can be applied as an adhesive to a steel plate on an oily surface in a 2-3 mm bead shape, When applied thinly, there is a problem that oil repelling and voids are generated, rust is generated from the portion, and rust prevention is significantly reduced. Even if diluted with an organic solvent such as xylene, there is a problem that the adhesion to the oil surface is low, and the rust resistance after durability is remarkably reduced. There was a problem such as lacking. In addition, a material containing conductive carbon black has a high viscosity and is subjected to high shearing at the time of carbon dispersion, resulting in a cut in the carbon chain exhibiting conductivity and a decrease in conductivity, or poor dispersion occurs when the chain is avoided. There have been various problems such as unevenness in conductivity.

[0007]

SUMMARY OF THE INVENTION The present invention relates to a coating type oil surface coating for imparting excellent rust prevention and excellent workability to various steel sheets and various aluminum alloy sheets to which press oil or rust prevention oil has adhered. An object of the present invention is to provide a rust preventive material composition and a rust preventive method thereof.

[0008]

Means for Solving the Problems The present inventor has conducted intensive studies to achieve the above object, and as a result, has found that an epoxy resin, a component comprising a reactive diluent and a phosphate ester plasticizer, and a powder weight comprising an acrylate. Coating, a conductivity imparting agent, and an epoxy resin composition containing a latent curing agent of an epoxy resin as an essential component enable coating of a thin film of 400 μm or less, and pass through an electrodeposition coating and an electrodeposition firing furnace after the first heating. The present invention was found by finding an oil-coated rust preventive composition which is excellent in rust prevention, oil surface adhesion, applicability, workability after application and workability after application and forms an excellent rust prevention film after curing, and its rust prevention method. Reached.

It is an object of the present invention to provide a liquid epoxy resin derived from bisphenol A and / or bisphenol F in an amount of 1 to 100 parts by weight with respect to a liquid epoxy resin, a reactive diluent and a phosphate ester plasticizer. By providing a rust preventive composition comprising 50 to 600 parts by weight of a component consisting of: 10 to 200 parts by weight of an acrylate powder polymer; and 5 to 80 parts by weight of a latent curing agent for an epoxy resin. Achieved by the composition of the present invention.
Apply to thin film of 400 μm, primary heating 80-150 ° C
This was achieved by a rust-prevention method employing a two-stage heating method in which the secondary heating is performed at 150 to 200 ° C.

That is, the coating type rust preventive composition of the present invention comprises (A) 100 parts by weight of a liquid epoxy resin derived from bisphenol A and / or bisphenol F,
(B) 50 to 600 parts by weight of a component comprising a reactive diluent and a phosphate ester plasticizer, (C) a conductivity imparting agent 1 to 10
0 parts by weight, powder polymer 10 comprising (D) acrylate
To 200 parts by weight, and (E) an epoxy resin curing agent 5
80 parts by weight.

Further, the coating-type rust-preventing method of the present invention is characterized in that the coating-type rust-preventing agent composition is applied to an object to be coated in a coating thickness of 50 to 400 μm. Further, the coating-type rust-preventing method of the present invention comprises applying the coating-type rust-preventing agent composition to an object to be coated, and then primary heating at a temperature of 80 ° C. or more and less than 150 ° C.
Further, secondary heating is performed at a temperature of 150 ° C to 200 ° C. That is, the method of the present invention is characterized by adopting a two-stage heating method to prevent rust. Furthermore, the coating-type rust-preventing method of the present invention is characterized in that the coating-type rust-preventing agent composition is applied to an object to be coated in a thickness of 50 to 400 μm, and the temperature is 80 ° C. or more.
It is characterized by performing primary heating at a temperature of less than 0 ° C. and further performing secondary heating at a temperature of 150 to 200 ° C.

In a preferred embodiment of the method of the present invention, it is preferable that the object to be coated is passed through an electrodeposition coating and electrodeposition firing furnace. Further, in a preferred embodiment of the method of the present invention, the composition of the present invention is coated with an oil-coated steel sheet of 3 g / m ² or less, or 4 g / m ² or less.
It is preferably applied to an oil-adhered aluminum alloy plate of m ² or less. In a preferred embodiment of the method of the present invention,
It is preferable to apply the composition of the present invention to a car body and / or a car part.

Hereinafter, the present invention will be described in more detail. The epoxy resin used in the present invention has the function of increasing the adhesiveness between the rust-preventive oil and the oily steel plate adhered to the cleaning oil, preventing the intrusion of moisture to the application surface, and maintaining the rust-preventive property, For example, bisphenol A and / or bisphenol F
And an epoxy resin derived from epichlorohydrin. For example, a liquid epoxy resin having at least two or more epoxy groups in the used epoxy resin molecule can be used.

The epoxy resin constituting the composition of the present invention is preferably a phenol or alcohol glycidyl ether type epoxy resin. However, the glycidyl ester type can also be used.

As the glycidyl ether type epoxy resin (phenol type), epoxy resins synthesized from various bisphenols, for example, bisphenol A, bisphenol F, brominated bisphenol A and bisphenol AD are preferably used. Further, a glycidyl ether of an alkylene oxide adduct of bisphenol A may be used. Further, bisphenol F type epoxy resin is also preferable.

As described above, the epoxy resin in the present invention is preferably a bisphenol A type epoxy resin, which is produced by condensation of bisphenol A and epichlorohydrin, as is well known. There are two production methods, a one-step method and a two-step method, and an epoxy resin obtained by either method can be used in the present invention.

The bisphenol A type epoxy resin of the present invention has an epoxy equivalent (g / eq) of 170 to 270. As the darede name, for example, Epicoat (manufactured by Yuka Shell Epoxy) 825, 827, 828, 834, or the like is preferably used.

The bisphenol F type epoxy resin in the present invention is preferably produced by condensation of 4,4'-methylenebisphenol with epochlorohydrin. The bisphenol F epoxy resin is also bisphenol A
Those having the same molecular weight and epoxy equivalent as the type epoxy resin can be preferably used.

The component comprising the reactive diluent and the phosphate ester plasticizer in the present invention enables the viscosity of the rust preventive to be reduced, and causes a high shear during dispersion of the conductivity-imparting agent, particularly carbon black. It has the effect of preventing the chain from being broken and providing good dispersion. Further lowering the viscosity produces the effect of ensuring good coating workability such as spray coating.

The amount of the component comprising the reactive diluent and the phosphate ester plasticizer is 50 to 600 parts by weight based on 100 parts by weight of the liquid epoxy resin. If the compounding amount is less than 50 parts by weight, the viscosity becomes high, the chain of the conductivity-imparting agent is cut, the conductivity is lowered, and the rust prevention is poor. In addition, the flowability after application is low, which causes rusting to generate voids. On the other hand, when the amount is more than 600 parts by weight, sagging occurs and the uniformity of the coating film cannot be maintained, and rust is generated from the thin film portion. Further, the dispersibility of the conductivity-imparting agent is reduced, and the rust-preventing property is poor.

The reactive diluent is well compatible with the epoxy resin, lowers the viscosity and improves the workability of applying the rust inhibitor,
A reactive diluent having a low viscosity, which has an effect of reacting with the epoxy resin and increasing the adhesion between the coating film and the substrate, is preferred.

Examples of the reactive diluent include n-butyl glycidyl ether, allyl glycidyl ether, 2-ethylhexyl glycidyl ether, phenyl glycidyl ether, glycidyl methacrylate, tertiary carboxylic acid glycidyl ester, diglycidyl ether, and (poly) ethyl glycol glycidyl. Ether, (poly) ethylene glycol diglycidyl ether, diglycidyl aniline, phenoxyalkyl monoglycidyl ether, 1,
6 hexanediol diglycidyl ether, trimethylolpropane triglycidyl ether, and polyoxyalkylene glycol diglycidyl ether are exemplified.
Preferred is 1,6 hexanediol diglycidyl ether.

The phosphate ester-based plasticizer has high compatibility with press oil and rust preventive oil, has an effect of preventing oil repelling, forming a continuous coating film, and improving rust preventive property. It also mixes well with the epoxy resin and has the effect of lowering the viscosity of the rust preventive agent. Has the effect of increasing rust.

Examples of the phosphate ester plasticizer include tributyl phosphate, tri-2-ethylhexyl phosphate, tricresyl phosphate and the like. Preferred is tricresyl phosphate. When only a phosphate ester-based plasticizer is blended, the bonding of the epoxy resin that maintains the adhesion between the substrate and the coating film is reduced, the adhesion of the coating film is reduced, the film is peeled off, and the rust prevention is poor. Therefore, it is used with a reactive diluent in the present invention.

The conductivity-imparting agent causes the rust-preventive film to exhibit conductivity during electrodeposition coating, thereby depositing an electrodeposition coating film on the rust-preventive film. The deposited electrodeposition coating film has the effect of increasing the fluidity in the firing furnace, covering the void portion cover and the gap between the rust-preventive film and the base material, and preventing the penetration of moisture to remarkably enhance the rust-preventive property.

Examples of the conductivity-imparting agent include zinc fine powder, copper fine powder, aluminum fine powder, conductive zinc oxide and carbon black. Preferably, carbon black whose conductivity is easily controlled is preferable, and among these carbon blacks, acetylene carbon black and Ketjen carbon black having high conductivity are preferable.

The compounding amount of the conductivity-imparting agent is as follows.
The amount is 1 to 100 parts by weight, more preferably 20 to 50 parts by weight, based on 00 parts by weight. If the amount is less than 1 part by weight, the rust preventive film cannot exhibit conductivity. On the other hand, when the amount is more than 100 parts by weight, the viscosity is increased, the coating workability is reduced, and rust is generated due to generation of voids. Therefore, in order to ensure rust prevention, 1 to 100 parts by weight is preferable.

The acrylate powder polymer of the present invention absorbs the epoxy resin by primary heating and swells.
This has the effect of giving the coating portion pseudo-hardening, does not interfere with welding after application, and prevents falling off and outflow in the pretreatment process up to the formation of a cured film. In addition, it has a function of improving the oil surface fixing property.

Examples of the powder polymer composed of acrylate include a) alkyl methacrylate such as methyl methacrylate, ethyl methacrylate, methyl methacrylate, and stearyl methacrylate; and methyl acrylate, butyl acrylate, and alkyl glycol (meth).
Polymer resin particles using one or more methacrylates or the like b) Core-shell type polymer resin particles of the above-mentioned polymer c) Polymer resin particles obtained by ion-crosslinking the surface of the polymer resin particles of a) or b) Can be mentioned. Preferred are the polymer particles of b) and c).

The amount of the acrylate powder polymer is 10 to 100 parts by weight of the epoxy resin.
It is 200 parts by weight, more preferably 50 to 150 parts by weight. If the compounding amount is less than 10 parts by weight, pseudo-hardening cannot be provided, and rust prevention is reduced due to oil repelling. On the other hand, if it exceeds 200 parts by weight, the rust-preventive film becomes hard and distorted, causing cracks due to impact or the like, leading to rust. Preferably 1
0 to 200 parts by weight is preferred.

The epoxy resin curing agent used in the present invention may be either a polyaddition type or a catalyst type (thermosetting type or ultraviolet curing type), and more preferably a heat-activated (latent) curing agent. A heat-activated (latent) curing agent is a curing agent that is stable during storage and activated at high temperatures,
For example, organic acid hydrazides such as adipoyl dihydrazide, isophthaloyl dihydrazide and derivatives thereof, dicyandiamide, diaminodiphenyl sulfone,
Imidazole derivatives having a triazine ring such as 2-methylimidazole / triazine salts, N, N-dialkylurea derivatives, N, N-dialkylthiourea derivatives, melamine derivatives, acid anhydrides such as trimellitic anhydride, and the like. And one or more of these may be used.
Dicyandiamide is particularly preferred from the viewpoint of storage stability after dispersion blending.

The compounding amount of the epoxy resin curing agent is 5 to 80 parts by weight based on 100 parts by weight of the epoxy resin. If the amount is less than 5 parts by weight, poor curing is caused, and moisture penetrates from the poor adhesion portion with the base material to cause rust. On the other hand, if it exceeds 80 parts by weight, the rust preventive film becomes hard and brittle, causing cracks due to distortion, impact and the like, leading to rust. Therefore, it is preferably 5 to 80 parts by weight.

In order to further enhance rust prevention, zinc phosphate,
A rust preventive pigment such as aluminum phosphate, calcium phosphate, zinc molybdate, magnesium phosphate, aluminum molybdate, aluminum dihydrogen tripolyphosphate, or a rust preventive of an organic acid amine salt can be blended.

[0034] Fillers can also be incorporated as needed. Examples include fused silica, crystalline silica, mica, alumina, calcium carbonate, calcium silicate, talc, barium sulfate, magnesium oxide, titanium oxide, aluminum hydroxide, and the like. These may be used alone or in combination of two or more. In addition, the surface of the filler is a silane coupling agent, a titanium coupling agent,
It may be treated with a fatty acid, a surfactant or the like.

The thickness of the coating type rust preventive composition of the present invention applied to a substrate is 50 to 400 μm. When the film thickness is 400 μm, cracks occur due to distortion after curing and impact resistance is reduced, and rust prevention is reduced. In addition, sagging and flow occur at the time of application, making it difficult to apply only to a required portion. If it is less than 50 μm, the smoothness of the film cannot be maintained due to the flow property of the coated particles, and a thin film portion is generated, and rust is remarkably generated due to moisture penetration. Therefore, a preferable coating film thickness is 50 to 400 μm.

As a heating method after coating, a two-stage heating method including primary heating and secondary heating is employed. Primary heating is
It exhibits pseudo-curing properties, secures good weldability, and has the effect of maintaining the adhesiveness to withstand showers such as pretreatment for painting. The primary heating temperature is at least 80 ° C and less than 150 ° C. 8
If the temperature is lower than 0 ° C., pseudo-hardening does not occur, and sagging and flow occur to contaminate the object to be coated. In addition, it is scattered by a shower during the pre-coating treatment, etc., and significantly reduces rust prevention. On the other hand, when the temperature exceeds 150 ° C., pseudo-hardening progresses and becomes hard, so that spot welding or the like becomes difficult. Therefore, the primary heating temperature is 80 to less than 150 ° C.

The secondary heating hardens the rust preventive film,
It has the effect of lowering the viscosity of the electrodeposition coating film on the rust-preventive film and covering the boundary portion of the rust-preventive film application or the void to prevent moisture penetration.
The secondary heating temperature is from 150C to 200C. If the temperature exceeds 200 ° C., the rust preventive film becomes brittle, distorted, and cracks are generated by impact or the like, so that the rust preventive property is significantly reduced. On the other hand, at a temperature lower than 150 ° C., uncured portions are generated in the rust-preventive film and the electrodeposition coating film, and moisture penetrates from the uncured portion having low adhesion to cause rust. Therefore, a temperature of 150 to 200 ° C. is adopted as the secondary heating temperature.

A two-step heating method in which the primary heating ensures the weldability and shower resistance of the panel and the secondary heating cures the rust-preventive film and electrodeposited film to ensure the rust-preventive property is essential to the present invention. It is a rust prevention method that does not do. Hereinafter, the present invention will be described in more detail by way of examples, but the present invention is not limited thereto.

[0039]

EXAMPLES Evaluation of the coating type rust preventive composition and the coated product was carried out by the following methods. 1) Rust prevention properties JIS G3 coated with rust prevention oil (Nippon Oil Co., Ltd., P1600)
70 (w) 150 (L) 0.8 using 141 standard plain steel plate or JIS G3302 standard galvanized steel plate
(T) Use test piece, and aluminum alloy is JIS
H4000 aluminum alloy 5154, 2m thick
Examples 1 to 23 and Comparative Example 1
The composition obtained in No. 16 was applied with a bar coder. 1
Next heating was performed for 10 minutes under the conditions shown in Tables 1 to 4, and thereafter, degreasing, phosphoric acid film treatment, and electrodeposition coating were performed. The secondary heating was performed for 30 minutes under the conditions shown in Tables 1 to 4 to prepare test pieces. The test piece was subjected to a salt water spray test in accordance with JIS K5400 for a durability of 1,000 hours, and visually evaluated for the occurrence of rust on the coating boundary portion and the coating film surface.

2) Fixing Property on Oil Surface The compositions obtained in each of the examples and comparative examples were applied to a test piece for adhesion of rust-preventive oil, and the presence or absence of oil repellency was evaluated. 3) Impact resistance JIS K5400 was applied to the coated product prepared with the same specifications as the rust prevention evaluation.
The overlap was dropped from a height of 30 cm using a Dupont method according to the above method to evaluate the impact resistance. 4) Coatability Using a 30: 1 airless pump from Graco Co., Ltd., the sample temperature was maintained at 40 ° C., and an air thickness of 5.0 kg / cm ² was applied to evaluate the atomization possibility, dripping after application, and flow. .

Examples 1 to 23 Epicoat 828 (trade name, Yuka Shell Epoxy Co., Ltd.) (epoxy resin derived from bisphenol A) as a liquid epoxy resin and dicyandiamide (Nippon Carbide) as a latent curing agent as a curing agent Is a core-shell type methacrylate polymer as a powder polymer made of acrylate, using tributyl phosphate, tri-2-ethylhexyl phosphate, and tricresyl phosphate manufactured by Daihachi Chemical Industry Co., Ltd. as a plasticizer. F-351 (product name,
Nippon Zeon Co., Ltd.), Denacol EX-212 (trade name, Nagase Kasei Kogyo Co., Ltd.) as a reactive diluent 1,6 hexanediol diglycidyl ether, and conductive zinc white as a conductivity imparting agent No. 1 (trade name, Honjo Chemical Co., Ltd.), Denka Black (trade name, Denki Kagaku Kogyo Co., Ltd.) as acetylene carbon black, and LF Bosei ZP-SB (trade name, Kikuchi Color Co., Ltd.) as zinc phosphate ) Was used as a surface-treated calcium carbonate using Homocal D (trade name, Shiraishi Industry Co., Ltd.)
The oil surface application type rust preventive compositions of Examples 1 to 23 were prepared with the formulations shown in Tables 1 and 2. Using the compositions of Examples 1 to 23, rust prevention, oil surface fixability, impact resistance, and applicability were evaluated. The evaluation results are shown in Tables 1 and 2.

[0042]

[Table 1]

[0043]

[Table 2]

Comparative Examples 1 to 16 The oil-surface-applied rust preventive compositions of Comparative Examples 1 to 16 were prepared with the formulations shown in Tables 3 and 4, and the obtained compositions were evaluated in the same manner as in the Examples. Was done. The results are shown in Tables 3 and 4.

[0045]

[Table 3]

[0046]

[Table 4]

[0047]

As described above, the oil-coated rust preventive composition of the present invention comprises: (A) 100 parts by weight of a liquid epoxy resin derived from bisphenol A and / or bisphenol F; 50 to 600 parts by weight of a component consisting of a conductive diluent and a phosphate ester plasticizer, 1 to 100 parts by weight of a (C) conductivity-imparting agent, 10 to 200 parts by weight of a powder polymer of (D) acrylate, and ( E) Since it is constituted so as to contain 5 to 80 parts by weight of an epoxy resin curing agent, it imparts extremely excellent rust prevention to steel sheets and the like to which various oils have adhered, and at the same time, has a stable oil surface. sex,
It has the effect of imparting impact resistance, good spot welding after coating, and coatability.

Further, the rust-preventing method of the present invention is configured such that the coating-type rust-preventing agent of the present invention is applied to an object to be coated in a predetermined thickness, and a two-stage heating method is employed at a predetermined temperature. As a result, good weldability and shower resistance of the panel can be ensured, and at the same time, an effect of imparting a coating film having excellent rust prevention and impact resistance can be obtained.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hisashi Nomura 2-22-1, Nihonbashi Ningyocho, Chuo-ku, Tokyo Inside Parker Corporation (72) Inventor Noriyoshi Torii 2 Takaracho, Kanagawa-ku, Yokohama-shi, Kanagawa Nissan Motor Inside the corporation

Claims (11)

[Claims] 1. A liquid epoxy resin 10 derived from (A) bisphenol A and / or bisphenol F.
0 parts by weight, (B) 50 to 600 parts by weight of a component comprising a reactive diluent and a phosphate ester plasticizer, (C) 1 to 100 parts by weight of a conductivity-imparting agent, and (D) a powder polymer 10 comprising an acrylate To 200 parts by weight and (E) 5 to 80 parts by weight of an epoxy resin curing agent. 2. The coating-type rust preventive composition according to claim 1, wherein the phosphate ester plasticizer is tricresyl phosphate and / or tributyl phosphate and / or tri-2-ethylhexyl phosphate. Stuff. 3. The oil-coated rust preventive composition according to claim 2, wherein the conductivity imparting agent is a metal powder, a metal oxide and / or carbon black. 4. The rust preventive composition according to claim 3, wherein the conductivity-imparting agent is carbon black. 5. The coating-type rust preventive composition according to claim 1, which is applied to a coating thickness of 50 to 400 μm. 6. A coating type rust preventive, characterized in that the coating type rust preventive composition according to any one of claims 1 to 5 is applied to an object to be coated to a coating thickness of 50 to 400 μm. Method. 7. A coating-type rust preventive composition according to any one of claims 1 to 5, which is applied to an object to be coated, and then subjected to primary heating at a temperature of 80 ° C. or more and less than 150 ° C. ~ 20
A coating-type rust-prevention method, wherein secondary heating is performed at a temperature of 0 ° C. 8. A coating type rust preventive composition according to any one of claims 1 to 5, which is applied to an object to be coated in a thickness of 50 to 300 μm, at a temperature of 80 ° C. or more and less than 150 ° C. A coating-type rust prevention method, comprising performing primary heating and then secondary heating at a temperature of 150 to 200 ° C. 9. The coating type rust prevention method according to claim 6, wherein the object is passed through an electrodeposition coating and electrodeposition firing furnace. 10. A coating type rust preventive composition according to any one of claims 1 to 5, comprising an oil-adhered steel sheet of 3 g / m ² or less;
Or coating type anti-rust method according to any one of claims 6-9, characterized in that applied to 4g / m ² or less of oil deposited aluminum alloy鈑. 11. A coating type rust preventive composition according to any one of claims 1 to 5, wherein the composition is applied to an automobile body and / or an automobile part. Or the coating type rust prevention method according to item 1.