JP2001340799A - Curing method by ultraviolet ray and its device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a curing method and a device in which UV curing is performed when undercoating the surface of a vehicle. etc., for a short time, safely to a human body and economically when a site-work to irradiate a coated surface or a small area is needed for repairs. SOLUTION: In the substrate treatment in the case of coating the face of a vehicle such as a two-wheeld vehicle, an automobile, a truck or an electric car, the thermosetting putty or surface uses a wavelength sensititzer as a photosensitizer to control the peak of a photosensitive wavelength to 350-450 nm, and hence curing is performed in a short time by making the most of the merit of UV curing. Further, when the coated face is repaired or a small area is irradiated by field work, a UV discharge lamp provided with a UV- Transmissive material such as heat-resistance glass absorbing <=320 nm UV light on the front is used in the UV curing, and economical curing method and device which are safe to the human body are obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to motorcycles, automobiles,
In the undercoating process of the painted surface of vehicles such as freight cars, train cars, etc., it enables short-time curing taking advantage of the characteristics of ultraviolet curing, and repairs painted surfaces and irradiates small areas with on-site work The present invention relates to a method and an apparatus which are safe and economical for the human body.

[0002]

2. Description of the Related Art A photo-curable putty or a photo-curable surfacer in a base treatment step for coating a painted surface of a vehicle or the like conventionally includes a photopolymerization initiator, a photopolymerizable composition, a pigment and a solvent. It is well known that it is composed. Generally, the wavelength region of ultraviolet light is effective for light having a wavelength of 200 to 400 nm.

[0003] Conventionally, in the case of repairing a painted surface and irradiating a small area, not only in a vehicle and the like, but also on-site work, use of a small ultraviolet irradiator has been proposed. For example, there are a black light type irradiation type and a handy type irradiation type.

[0004] In the black light type irradiation type, the size varies from 15 to 200 W, but in most cases it is 36 W.
Ultraviolet discharge lamp having a main wavelength of 5 nm and 300 to
Equipped with a black filter that transmits only 400 nm,
The irradiation surface was designed so that harmful ultraviolet rays to the human body were not irradiated. However, since it is used for fluorescence emission because of a small amount of ultraviolet irradiation, it is not currently used for field work.

[0005] The handy type irradiation type has a size of 400 to 2,000 W and has a large amount of ultraviolet light, which is suitable for on-site work. However, at present, all irradiators are dangerous because the harmful ultraviolet rays from the ultraviolet discharge lamp are also radiated to the front surface while the front surface is open.

[0006]

DISCLOSURE OF THE INVENTION The present invention relates to a photo-curing putty or a photo-curing surfacer for a vehicle or the like, which has an effect on light having a wavelength range of 320 to 450 nm. Drying, repair of painted surface,
It has an effective light emission amount of 150 to 2000 W for irradiation to a small area, and prevents harmful ultraviolet rays from being irradiated from the front of the irradiation device, and is safe and economical for the human body. It is intended to provide a curing method and apparatus.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to A.I. In the undercoating process of the coating for vehicles, the photosensitive wavelength range is 320 nm or more, and the light-curing putty or the surfacer material is irradiated with a light transmitting material that absorbs ultraviolet light of 320 nm or less from an ultraviolet discharge lamp having a front surface. It is characterized by being cured.

B. The photo-curing putty or surfacer material is characterized in that the peak of the photosensitive wavelength range is set to 350 to 450 nm by using a wavelength sensitizer as the photosensitizer.

C. An ultraviolet discharge lamp having a power of 150 to 2000 W and an ultraviolet transmitting material made of heat-resistant glass that absorbs ultraviolet light of 320 nm or less and transmits ultraviolet light of 320 nm or more are provided on the front surface thereof.

[0010]

The light-curing putty or surfacer material uses a wavelength sensitizer as a photosensitizer so that the peak in the photosensitive wavelength range is 350 to 450 nm. This is because, unlike the present invention, the peak of the wavelength has the following two drawbacks due to the peak at approximately 200 to 300 nm. One of the drawbacks is that in the vehicle surface treatment process, putty and surfacer have a thickness, so that only the surface is cured by light in the short wavelength region of 200 to 300 nm and ultraviolet rays, and it is not cured to the deep part of the thickness. It is. Another disadvantage is the generation of harmful ultraviolet rays. That is, in order to cure the ordinary ultraviolet curable paint, the ultraviolet light source is also required to be 20 μm.
Requires 0-300 nm UV. Ultraviolet rays of this wavelength are called harmful ultraviolet rays because they cause an erythema effect (sunburn) or ophthalmitis (snow eyes) on the human body. FIG. 1 shows the spectral sensitivity of harmful ultraviolet rays.

The photocurable putty or surfacer material cures to the inside even when it is thick in a photocurable coating material having a photosensitive wavelength peak of 350 to 450 nm by using a wavelength sensitive material as a photosensitizer. It has superiority and does not require ultraviolet light having a wavelength of 300 nm or less among required light. In other words, it has an advantage of not requiring ultraviolet light in a harmful ultraviolet region.

Among the conventional UV irradiators, the black light type irradiation type has various sizes of 15 to 200 W, but most of them have an ultraviolet discharge lamp having a main wavelength of 365 nm and transmit only 300 to 400 nm through the entire surface. The filter has a structure in which the irradiating surface is not irradiated with harmful ultraviolet rays to the human body. However, it is used for fluorescence emission because the amount of UV irradiation is small,
At present, it is not used for on-site work in the ground treatment process for vehicles and the like. In addition, the size of the hand-held irradiation type is 400 to 2,000 W, and the amount of ultraviolet light is large, which is suitable for on-site work. However, at present, all the irradiators have their front faces open and all harmful ultraviolet rays from the ultraviolet discharge lamp are also radiated to the front faces.

The size of the ultraviolet irradiator is determined by the application. However, in repairing extremely fine scratches in the surface treatment of a vehicle or the like, a power of 150 W is sufficient, and the surface treatment work is generally performed. In general, since the work is on-site work, the irradiator needs to be a handy type, and its size is almost 2000 W, because the power supply capacity and on-site heat release from the ultraviolet discharge lamp become too large. It is.

In the undercoating step of the coating for a vehicle according to the present invention, an ultraviolet light transmitting material such as a heat-resistant glass which absorbs an ultraviolet light having a wavelength of 320 nm or less is applied to a front surface of a photo-curing putty or a surfacer material having a photosensitive wavelength range of 320 nm or more. By using the curing method of irradiating with the provided ultraviolet discharge lamp, the curing and drying of the ultraviolet paint can be surely performed, and a practical and economical apparatus can be provided without irradiation of the human body with harmful ultraviolet rays.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings and Table 1.
The photo-curing putty or surfacer material has a peak in the photosensitive wavelength range of 35 by using a wavelength sensitizer as the photosensitizer.
FIG. 2 shows a spectral sensitivity curve of the photocurable coating material in the range of 0 to 450 nm. The peak of the photosensitive wavelength was 370 nm, and the effective sensitivity range was 350 to 450 nm. FIG. 3 shows a spectral sensitivity curve of a conventional UV-curable paint. The peak of the photosensitive wavelength is 270 nm, and the effective sensitivity range is 200 to 3
It was 80 nm.

FIG. 4 is a schematic view of an ultraviolet irradiator according to the present invention.
FIG. 4A is a schematic view of an ultraviolet irradiator according to FIG. 4B for comparison. 4 (a) and 4 (b)
In the figure, reference numeral 1 denotes a metal halide lamp doped with iron iodide and having a lamp power of 1000 W. Reference numeral 2 denotes an ultraviolet transmitting material made of heat-resistant glass usually called Pyrex (registered trademark) glass. In FIG. 4B, no ultraviolet transmitting material is provided.

FIG. 5A shows an energy distribution diagram radiated from the irradiator according to the present invention. For reference, FIG. 5B shows an energy distribution diagram radiated from the irradiator of the conventional device. Comparing FIG. 5A and FIG. 5B, 320 nm
The following harmful ultraviolet rays are very slight in the present invention, and it can be seen that there is no difference between the effective ultraviolet rays for the photocurable paint.

[0018]

[Table 1]

Table 1 shows the evaluation of the effect and safety when irradiating ultraviolet rays to the ultraviolet paint applied to a thickness of 2 mm. As described in Table 1, the effect of irradiation on the conventional paint was slightly longer but the curing effect was completely cured to a deeper portion. The difference was significant in the coatings according to the invention. The paint of the present invention is completely cured with the irradiator of the present invention in only 10 seconds, but the conventional apparatus cures only the surface. The interior has been shown to be uncured and impractical. Further, the harmful ultraviolet light illuminance at a distance of 1 m from the device is 218 μW / cm ² for the amount of harmful ultraviolet light in the conventional device, but 6 μW / cm ^{2 for the} amount of harmful ultraviolet light in the device of the present invention.
It is a safe device.

[0020]

As described above, according to the present invention, by carrying out the present invention, in the base treatment step for coating the painted surface of a vehicle such as a two-car, a car, a freight car, a train car, etc. The photo-curing putty or surfacer material uses a wavelength sensitizer as the photosensitizer to make the peak of the photosensitive wavelength range from 350 to 450 nm, thereby enabling short-time curing utilizing the characteristics of ultraviolet curing, and coating. When working on site to repair surfaces or irradiate small areas,
By using a curing method of irradiating an ultraviolet light transmitting material such as a heat-resistant glass that absorbs ultraviolet light of 320 nm or less with an ultraviolet discharge lamp provided on the front surface, it is possible to provide a safe and economical curing method and apparatus for a human body. it can.

Further, in the present invention, the photo-curing material has a peak in the photosensitive wavelength range of 350 to 450 nm and an ultraviolet ray irradiator having an ultraviolet transmitting material such as heat-resistant glass which absorbs ultraviolet light of 320 nm or less on the front surface. It is expected to be an effective means not only for the base treatment of paint for vehicles and the like, but also effective for painting vending machines, repairing painted surfaces of buildings, applying flooring, etc. .

[Brief description of the drawings]

FIG. 1 is a graph showing the spectral sensitivity of harmful ultraviolet rays.

FIG. 2 is a graph showing a spectral sensitivity curve of a photocurable coating material according to the present invention.

FIG. 3 is a graph showing a spectral sensitivity curve of a conventional ultraviolet curable paint.

FIG. 4 (a) is a schematic view of an ultraviolet irradiator according to the present invention,
(B) is a schematic diagram of a conventional ultraviolet irradiator.

5A is a graph showing the energy distribution radiated from the irradiator according to the present invention, and FIG. 5B is a graph showing the energy distribution radiated from the irradiator of the conventional device.

[Explanation of symbols]

1. Metal halide lamp doped with iron iodide with a lamp power of 1000 W 2. Ultraviolet transmitting material made of heat resistant glass

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C09D 201/00 C09D 201/00 (72) Inventor Nobuyuki Masuda 1418-2 Onohara, Chinobu-shi, Saitama −202 (72) Inventor Hirotake Ichikawa 848, Wada-cho, Hamamatsu-shi, Shizuoka Prefecture (72) Inventor Yasumori Kanehira 2-35-2 Nisshinmachi, Fuchu-shi, Tokyo F-term in Finetech Co., Ltd. 4D075 BB42Z BB46Z DB02 DC12 EA21 4F042 AA09 DB42 DB47 4J038 JB08

Claims (2)

[Claims] In the undercoating process of a coating for a vehicle,
Curing by ultraviolet light, wherein a light-curing putty or surfacer material having a photosensitive wavelength range of 320 nm or more is cured by irradiating a light transmitting material that absorbs ultraviolet light of 320 nm or less with an ultraviolet discharge lamp provided on the front surface. Method. 2. The curing method according to claim 1, wherein the wavelength of the photosensitive wavelength range of the photo-curing putty or surfacer material is 350 to 450 nm by using a wavelength sensitizer as the photosensitizer. Photo-curable paint as a device used for [Claim 3] An ultraviolet discharge lamp having an electric power of 150 to 2,000 W and an ultraviolet transmitting material made of heat-resistant glass that absorbs ultraviolet light of 320 nm or less and transmits ultraviolet light of 320 nm or more are provided on the front surface. An ultraviolet irradiator as an apparatus used in the ultraviolet curing method according to claim 1.