JPH1080666A - Formation of putty coating film on outside plate of railway vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for forming a putty coating film on an outside plate of a railway vehicle by which a long-term stable coating operation is realized and the putty coating film having a required thickness with a simple operation in a short time without requiring skillfulness even if a static mixer is not used. SOLUTION: Spray coating is executed by separately introducing a main agent component forcibly fed at a pressure suitable for the spray coating, a curing agent component forcibly fed by compressed air and separate compressed air into a spray gun 3 respectively, preliminarily mixing the curing agent component forcibly fed by compressed air with a part of the separate compressed air by a nozzle disposed in the rear of the inside of the spray gun 3, making a preliminary mixture and the remainder of the separate compressed air confluent in the front of the inside of the spray gun 3 and simultaneously making both collide with an impact material, and diacharging a mixture of the uniformly mixed curing agent component and the separate compressed air by the impact wave effect thereof while both are made confluent and mixed with the main ingredient component at the tip end part of the spray gun.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a putty coating film on the outer surface of a railway vehicle, which is excellent in coating workability and the like.

[0002]

2. Description of the Related Art In general, the surface of a railcar outer panel is first painted with a primer in order to have a good appearance and to prevent corrosion, etc., and then putty painted (putted) to smooth the surface. And then paint the surfacer,
Finished with a top coat. By the way, in primer coating, surfacer coating and top coating,
Usually, a spray coating method is used. However, in the case of putty coating, a metal spatula is used for putting, since it is usually required to have a film thickness of about 1 to 10 mm.

[0003]

However, compared with road vehicles, railway vehicles have a very large outer plate surface area.
In addition, in order to correct and smooth the distortion (undulation) of the outer plate of the railway vehicle, it is necessary to perform a putty operation by human power, usually about 3 to 6 times. The putty attaching method not only requires a lot of work time, but also requires a considerable skill of the worker, and has a problem that the workability is very poor.

Therefore, a method of forming a putty coating film by a spraying method, which does not require much skill and is simple, has already been disclosed in Japanese Patent Application Laid-Open No. Hei 7-328523. This method can be said to be a revolutionary method compared to the conventional method, but because it uses a static mixer, it is prone to breakdown over a long period of use, and it is necessary to replace and repair packings, In addition, there is a problem that it is difficult to discharge the main component and the hardener component in a state where they are slightly mixed.

The present invention has been made to solve the above-mentioned problems of the prior art, and requires a simple operation without using a static mixer, in a short time, without any skill, and Long-term stable coating work can be realized,
An object of the present invention is to provide a method for forming a putty coating film on an outer panel of a railway vehicle, which can obtain a putty coating film having a required thickness.

[0006]

That is, the present invention provides a main component containing an unsaturated polyester resin, a vinyl monomer and a filler as an essential component, and an organic peroxide as an essential component on the surface of a railway vehicle outer panel. A method of forming a putty coating by spray-coating a putty composition comprising a curing agent component and the main agent component pumped at a pressure suitable for spray coating, the curing agent component pumped by compressed air, and Separately, compressed air is separately introduced into the spray gun, and the hardener component pumped by the compressed air and a part of the separately compressed air are premixed by a nozzle provided at the rear inside the spray gun, The pre-mixture and the remainder of the separately compressed air are merged in front of the spray gun and collided with an impact material. A mixture of the the hardener component separately compressed air, with a spray gun tip is discharged while merging mixed with the main agent component, characterized by spray painting.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to preferred embodiments. The putty composition used in the present invention is a two-pack type putty composition comprising a main component and a curing agent component. The main component is an unsaturated polyester resin, a vinyl monomer and a filler as essential components, and further blends various additives such as a curing accelerator and a stabilizer, a modified resin, a plasticizer, and a solvent as needed. It is composed of things.

As the unsaturated polyester resin, the unsaturated polyester resin used in ordinary putty compositions can be used. In the present invention, (a) α, a polybasic acid component consisting of a mixture of β-unsaturated polybasic acid and saturated polybasic acid in a molar ratio of 9: 1 to 3: 7, preferably 8: 2 to 4: 6: 30 to 60% by weight; , (B) polyhydric alcohol component:
An air-drying component comprising 10 to 40% by weight and (c) an allyl compound having an iodine value of 40 or more and / or animal or vegetable oil: 3
When an unsaturated polyester resin having an acid value of 70 or less and a number average molecular weight of 1,000 to 4,000, which is obtained by reacting with an unsaturated polyester resin, is excellent in drying property, it is hard to cause cracks, and has abrasiveness. Excellent putty coating is obtained.

The α, β-unsaturated polybasic acids include maleic acid, maleic anhydride, fumaric acid, itaconic acid and citraconic acid, and the saturated polybasic acids include adipic acid, azelaic acid and sebacine. Acid, phthalic anhydride,
There are phthalic acid, isophthalic acid, tetrahydrophthalic anhydride and the like, but from the viewpoint of crack resistance and the like, it is preferable that the saturated polybasic acid is mainly composed of an aliphatic compound.
When the molar ratio between the α, β-unsaturated polybasic acid and the saturated polybasic acid in the polybasic acid component is out of the above range, the dryness, the abrasiveness, and the crack resistance of the putty coating film are reduced. In some cases, a value within the above range is preferable for practical use, because any of these may be insufficient.

The polyhydric alcohol component includes ethylene glycol, propylene glycol, diethylene glycol, water-containing bisphenol A, bisphenol A
And derivatives of ethylene oxide or propylene oxide.

The air-drying component is used for improving the polishing property of the putty coating film, and is therefore preferably an allyl compound having an iodine value of 40 or more and / or an animal or vegetable oil. Are allyl compounds such as allyl glycidyl ether, allyl glycol, glycerin (di- or mono) allyl ether, trimethylolpropane diallyl ether; soybean oil, linseed oil, dehydrated castor oil, tung oil, fish oil or their transesterified oils, fatty acids And animal and vegetable oils.

In addition to the above components, components such as alkyl glucidyl ester and dicyclopentadiene are added as reactive components to the unsaturated polyester resin component in order to improve the durability and adhesion of the putty coating film against expansion and contraction. It is also possible to use them together.

In the unsaturated polyester resin used in the present invention, the relative amounts of the polybasic acid component, the polyhydric alcohol component and the air-drying component are not strictly limited, but are based on the total weight thereof. And 30 ~
Suitably, it is 60%, 10-40% and 3-30% by weight.

Such unsaturated polyester resins are produced by a conventional method. For example, a polybasic acid component, a polyhydric alcohol component and an air-drying component are subjected to a polycondensation reaction at 150 to 250 ° C. All or a part of the basic acid component and the polyhydric alcohol component at 120 to 220 ° C.
After the reaction, it is obtained by adding the remaining polybasic acid component and the air-drying component and reacting at 120 to 220 ° C. The unsaturated polyester resin has a number average molecular weight of 100 from the viewpoint of workability, water resistance and the like of the putty composition.
Those having 0 to 4000 and an acid value of 70 or less are suitable.

Examples of the vinyl monomer include styrene, α-methylstyrene, chlorostyrene, vinyltoluene, t-butylstyrene, divinylbenzene, methyl (meth) acrylate, ethyl (meth) acrylate, glycidyl (meth) Typical examples include acrylate, 2-ethylhexyl (meth) acrylate, vinyl acetate, acrylonitrile, and diacryl phthalate.

As the filler, calcium carbonate,
Inorganic pigments such as barium sulfate, talc, clay, kaolin, mica, silica, etc., inorganic or organic coloring pigments such as titanium oxide, red iron oxide, carbon black, iron oxide, cyanine blue, etc., glass fibers, glass balloons, plastic balloons, etc. Are typical examples.

Additives that may be added as necessary include metal salt compounds of metals such as cobalt, manganese and calcium with organic acids such as naphthenic acid and octylic acid, and curing accelerators such as tertiary amines; And the like.

Examples of the modified resin include cellulose acetate butyrate and cyclopentadiene oil.

Regarding the mixing ratio of each component in the main component, the weight ratio of the unsaturated polyester resin to the vinyl monomer is 30:70 to 80:20, preferably 45:70.
The ratio is preferably 55 to 65:35. In addition, when the former is less than the above range, the curability and the meat properties of the putty coating film tend to decrease, while, when the former is more than the above range, the hardness of the putty coating film decreases, and when polishing, Tend to be easily scratched.

Mixture of unsaturated polyester resin and vinyl monomer: 50 to 50 parts by weight of filler
400 parts by weight, preferably 100 to 250 parts by weight, and the curing accelerator is 0 to 10 parts by weight, preferably 1 to 5 parts by weight.
Parts by weight, and the stabilizer is 0 to 10 parts by weight, preferably,
It is appropriate to use 1 to 5 parts by weight.

On the other hand, the curing agent component comprises an organic peroxide curing agent as an essential component and, if necessary, a plasticizer, the above-mentioned additives, a coloring pigment, and the like.

As the organic peroxide curing agent, methyl ethyl ketone peroxide, benzoin peroxide,
Representative examples include acetyl peroxide, cumene hydroperoxide, di-tert-butyl peroxide, and cyclohexanone peroxide.

Examples of the plasticizer include phthalic acid esters such as dimethyl phthalate, diethyl phthalate and dioctyl phthalate; aliphatic dibasic acid esters such as dioctyl adipate and dibutyl sebacate; diethylene glycol diester Glycol esters such as benzoate are typical examples. The curing agent component may be an organic peroxide alone, but is preferably used in combination with a plasticizer.

The mixing ratio of the organic peroxide curing agent and the plasticizer is 3: 7 to 8: 2, preferably 5: 5 to 5 by weight.
A ratio of 7: 3 is appropriate.

The mixing ratio of the main component and the curing agent component is determined by the weight ratio of the total amount of the unsaturated polyester resin and the vinyl monomer in the main component to the amount of the organic peroxide in the curing agent component. It is suitable that the ratio is 100: 0.5 to 100: 5, preferably 100: 1 to 100: 3.

Next, an embodiment of the method for forming a putty coating film on the outer surface of a railway vehicle according to the present invention will be specifically described with reference to the drawings. FIG. 1 is a schematic structural view of a coating means used in carrying out the present invention, and FIG. 2 is a side sectional view of the spray gun. Here, code 1
Is a pressurized tank for the main component, and 2 is a pressurized tank for the curing agent component. The main component in the pressurized tank 1 is
Airless coating machine 4 at a pressure of about 0.5-4 kg / cm ²
Sent to.

The airless coating machine 4 is provided with a heater 5. Preferably, the main component is heated to 30 to 50 ° C. and its viscosity is adjusted to 90 to 150 poise to facilitate spray coating. (Rion viscometer rotor No.2)
However, the above-mentioned heating is not always necessary.

The main component having a reduced viscosity is supplied to a pump mechanism provided in the airless coating machine 4 for about 90 to 21.
0 kg / cm ² , preferably 120 to 180 kg / c
At a pressure of m ² , it is introduced into the spray gun 3. On the other hand, the hardener component in the pressurized tank 2 is
g / cm ² , preferably 1.5 to 3 kg / cm ² , into the spray gun 3. At the same time, compressed air other than compressed air for pressure-feeding the curing agent component is supplied to about 1 to 8 kg / cm ² , preferably ² to 5 kg / cm ² .
At a pressure of m ² , it is introduced into the spray gun 3. The main component, the curing agent component and the compressed air are separately introduced into the spray gun 3 as shown in FIG.

The hardener component pumped by the compressed air is
As shown in FIG. 2, they merge separately as a part of the compressed air that has passed through the branched route 6, and the merged substances pass through the nozzle 7, are roughly mixed with each other, and are premixed.

The nozzle 7 forms a passage that becomes narrower toward the tip of the spray gun 3. At the tip of the nozzle 7, the passage is suddenly expanded again. The narrowest passage diameter of the nozzle 7 is suitably about 1 to 3 mm.

As described above, the premixed hardener component and a part of the separately compressed air merge with the rest of the compressed air separately near the front inside the spray gun 3, and the merged product is formed by an impact material (baffle plate). 8), and the curing agent component and the compressed air are homogeneously mixed by the shock wave effect at that time.

As described above, the hardener component and the compressed air, which are homogeneously mixed, are discharged toward the outer surface of the railcar, while being mixed and mixed at the tip of the spray gun 3 with the aforementioned main component, Form putty coating of required thickness.

In the method of the present invention, since the nozzle and the impact material are provided inside the spray gun, the hardener component and the compressed air are homogeneously mixed, so that the main component and the hardener component are discharged. In this case, uniform mixing can be achieved, and it is possible to avoid the possibility of failure due to long-term use as in the case of using a static mixer, the structure is simple, and maintenance such as cleaning is easy. .

The putty composition comprising the main component and the curing agent component is opened and closed by operating the trigger 9 of the spray gun 3 to supply / cut off the putty.

The putty coating is formed by spraying and curing the putty composition until the distortion of the structure of the railway vehicle can be corrected, and then, if necessary, by ordinary paper / sanding.

[0036]

The present invention will be described in more detail with reference to the following examples. In this example, "parts" and "%" are "parts by weight" and "% by weight", respectively. (Example 1) Main component having the following composition (viscosity: 400 poise /
(20 ° C.) prepared: unsaturated polyester resin varnish 33% styrene 8% titanium oxide 5% talc 52% hydroquinone 1% cobalt naphthenate 1% The above unsaturated polyester resin varnish is maleic anhydride / adipic acid / phthalic anhydride Unsaturated polyester resin obtained by reacting a polybasic acid component composed of an acid = 50/30/20 (molar ratio), a polyhydric alcohol component composed of diethylene glycol, and an air-drying component composed of trimethylolpropane diallyl ether ( This is a 65% styrene solution having an acid value of 10, a number average molecular weight of 1800, and an air-drying component ratio of 7.5%.

A hardening agent component having the following composition was prepared: methyl ethyl ketone peroxide 55% dimethyl phthalate 44% azo yellow pigment 1% Two-part epoxy resin primer-coated steel plate (10
1 × 200 cm) using the coating means shown in FIGS. 1 and 2 to apply the solvent-free putty composition comprising the main component and the curing agent to the following spray coating so that the average film thickness becomes about 3 mm. Under the conditions, the entire surface was spray-painted. The coating was completed in a short time of 120 seconds. By the way, when putting with a conventional spatula, it took 30 minutes. Spray coating conditions: Mixing ratio of main component and hardener component = 100: 3; Pressure of main component from pressure tank to airless coating machine =
4Kg / cm ² ; temperature and viscosity of main component in airless coating machine = 40 ° C,
120 poise; pressure for feeding the main component from the airless coating machine to the spray gun = 150 kg / cm ² ; pressure for sending the curing agent component to the spray gun = 2.5 kg / c
m ² ; pressure of compressed air sent to the spray gun = 5 kg / cm ² .

(Examples 2 to 5) In order to evaluate the performance of a putty coating film obtained from the solvent-free putty composition used in Example 1, a putty coating film was formed under the same conditions as in Example 1. And
The putty coating film was subjected to various tests such as polishing, heat cycling, water adhesion resistance, tensile strength and elongation. The test methods were as follows.

Example 2 Abrasiveness: A putty composition was spray-coated (thickness: 3 mm) on a polished steel plate (150 × 70 × 0.8 mm) coated with a two-part epoxy resin primer, and then left at room temperature for 4 hours. Then, it was polished by hand using water-resistant paper # 150, and the easiness of polishing was evaluated.

Example 3 Heat cycle property: The above-mentioned polished steel sheet was spray-coated with a putty composition (thickness: 3 mm), allowed to stand at room temperature for one day, and then placed in a dryer at 80 ° C. for 2 hours. Immediately-
After putting in a freezer at 10 ° C. for 2 hours and repeating this four times, the putty coating surface was visually evaluated.

Example 4 Water-Resistant Adhesion: The above-mentioned polished steel plate was spray-coated (film thickness: 1 mm), allowed to stand at room temperature for one day, then immersed in warm water at 60 ° C. for 4 hours, and dried. Then, the test plate was bent at 90 degrees, and the presence or absence of peeling was examined.

Example 5 Tensile strength and elongation: After the putty composition was spray-coated on a plastic plate (film thickness: 1 mm), it was left at room temperature for one day.
The putty coating was peeled off. This putty coating film is 10 × 50 mm
The tensile strength and elongation of the obtained test piece were measured with a tensile tester at a tensile speed of 5 mm / min.

The results are as shown in Table 1. As described in Example 1, the obtained putty coating film was not only able to be applied in a short time with good coating workability, but was also a putty coating film having excellent performance as evident from Table 1.

[0044]

[Table 1]

[0045]

As described above, according to the method of forming a putty coating film on the outer surface of a railway vehicle according to the present invention, the coating method can be applied to a new coating, repainting or repair coating of the outer surface of a railway vehicle. It is possible to form a putty coating film of the required thickness with a simple operation and in a short time, without the need for skill, and with a stable coating workability. The ingredients are mixed at the tip of the spray gun, so there is no problem in pot life, etc., and since both form a putty coating in a homogeneously mixed state, the original physical and chemical A homogeneous putty coating film with excellent mechanical properties can be obtained.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a coating means showing one embodiment of the present invention.

FIG. 2 is a side sectional view of a spray gun.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pressurized tank for main component 2 Pressurized tank for hardener 3 Spray gun 4 Airless coating machine 5 Heater 6 Branch route 7 Nozzle 8 Impact material 9 Trigger

──────────────────────────────────────────────────続 き Continuation of the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical indication // C09D 4/06 C09D 4/06 (72) Inventor Takanari Suzuki Nishikujo, Konohana-ku, Osaka-shi, Osaka 6-1-1124 Within Dai Nippon Paint Co., Ltd. (72) Inventor Kazuo Tomizawa 1382-12 Shimoishigami, Otawara City, Tochigi Prefecture Inside Nasu Plant of Dai Nippon Paint Co., Ltd. (72) Inventor Takashi Kimura Konohana-ku, Osaka City, Osaka Prefecture Nishikujo 6-chome 1-1124 Dai Nippon Paint Co., Ltd.

Claims (3)

[Claims] 1. A putty composition comprising a main component having an unsaturated polyester resin, a vinyl monomer and a filler as essential components, and a curing agent component having an organic peroxide as an essential component, on a surface of a railcar outer panel. In a method of forming a putty coating film by spray coating, the main component component pumped at a pressure suitable for spray coating, the curing agent component pumped by compressed air, and separately compressed air are separately sprayed, respectively. Introduced into a gun, the hardener component pumped by the compressed air and a part of the separately compressed air are premixed by a nozzle provided at the rear inside the spray gun, and the premix and the remainder of the separately compressed air are mixed. Are combined at the inside front of the spray gun and collide with the impact material, and the shock wave effect causes the mixing of the homogeneously mixed curing agent component and the separately compressed air. A method for forming a putty coating film on an outer plate of a railway vehicle, comprising discharging an object at the tip of a spray gun while mixing and mixing with the main component, and spray coating. 2. The main component, the curing agent component, and separately compressed air are respectively 90 to 210 kg / cm ² and 1 to 5 kg.
/ Cm ² and at a pressure of 1～8Kg / cm ^2, and introducing the spray gun, the method of forming the putty coating to rail vehicle outer panel according to claim 1. 3. The method for forming a putty coating film on an outer panel of a railway vehicle according to claim 1, wherein the main component preheated to a temperature of 30 to 50 ° C. is introduced into a spray gun.