JPS6173056A - Testing machine for weather resistance - Google Patents

Abstract

PURPOSE:To prevent dew condensation on ultraviolet-ray transmitting glass which has a heat layer and to prolong the life of the testing machine by isolating a lamp chamber and a sample chamber from each other with the ultraviolet- ray transmitting glass and a partition wall. CONSTITUTION:Ultraviolet-ray lamps 21 are arranged on one flank of a sample tank 1 and holders 32 for samples 31 are arranged on the other flank. Then, the tank 1 is partitioned into the lamp chamber 2 and sample chamber 3 by the ultraviolet-ray transmitting glass 5 having the heat layer in parallel to the array surfaces of the lamps 21 and the partition wall member 51 joined with it. The ultraviolet-ray transmitting glass 5 is applied with electric power to raises the temperature, and then dew condensation on the surface of the glass is prevented. Further, the lamp chamber 2 and sample chamber 3 are isolated from each other to prevent a rise in the ambient temperature of the lamps 5, thereby prolonging the life of the testing machine.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to improvements in weatherability testers.

[Conventional technology]

Conventional weather resistance testers [e.g. QUV (Q-PANEL
The light/dew cycle tester 5LD-1 (manufactured by Suga Test Machine Co., Ltd.), the test 411 disclosed in Japanese Patent Application Laid-Open No. 58-71439, etc. , the chemical sample is irradiated with or without a filter provided between the lamp and the sample.

However, when the sample chamber is subjected to high temperature and high humidity conditions, dew condensation occurs on the surface of the filter due to the temperature difference between the lamp side and the sample side of the filter. In this case, there is a drawback that the intensity of light irradiated onto the sample becomes non-uniform due to the lens action of the water droplets produced.

On the other hand, it is usually preferable to use an ultraviolet fluorescent lamp in an atmosphere at 25 to 35°C in terms of light intensity and life. That is, when the lamp is used for 100 hours at an ambient temperature of 45° C., the light intensity decreases by about 30% compared to normal use. Therefore, when the sample chamber is heated to a high temperature, when the sample chamber is heated to a high temperature, the temperature near the lamp inevitably becomes equal to or higher than the sample chamber. This is not preferable in terms of the life of the lamp.

Furthermore, when using the conventional weather resistance tester mentioned above to conduct a test that simulates day and night outdoor exposure, when the ultraviolet fluorescent lamp is repeatedly turned on (irradiation) and turned off (darkness, condensation). The light intensity of the lamp decreases in proportion to the number of times the lamp is blinked, and the lifespan (the possible irradiation time) of the lamp is also shortened compared to when the lamp is lit continuously. Therefore, the weather resistance tester has the disadvantage that a constant amount of light cannot be obtained over a test period of repeated turning on and off, and furthermore, it has a short lifespan.

[Problem that the invention seeks to solve]

The present invention has been made to overcome the above-mentioned drawbacks, and aims to provide a weather resistance tester that can uniformize the light intensity by preventing dew condensation and has a long life.

[Means for solving problems]

The weather resistance tester of the present invention includes a test tank into which an ultraviolet fluorescent lamp and a sample are placed through a partition wall, and a temperature and humidity control device that controls the temperature and humidity inside the sample chamber in the test tank. between the ultraviolet fluorescent lamp and the sample, the partition wall includes an ultraviolet-transmitting glass and is equipped with temperature control means to prevent condensation; A lamp chamber in which a light lamp is housed and a sample chamber in which the sample is housed are separated.

The main component of the weather resistance tester of the present invention is a partition wall that is provided between the ultraviolet fluorescent lamp and the sample, includes ultraviolet-transparent glass, and is equipped with temperature control means to prevent condensation. The partition wall has the ultraviolet 11! The lamp chamber in which the fluorescent lamp is housed is separated from the sample chamber in which the sample is housed.

The partition wall has an ultraviolet-transmissive glass for irradiating the sample with light emitted from an ultraviolet fluorescent lamp. For example, as shown in FIG. 1, the partition wall includes the ultraviolet transmitting glass 5 arranged parallel to the array surface of the plurality of ultraviolet fluorescent lamps 21 provided on the left end surface of the test chamber 1, and the glass 5.
It may be made of a member 51 to be joined to the entire outer circumferential end of the tube, or it may be made entirely of ultraviolet-transmitting glass. The ultraviolet-transmitting glass material 71 may be any glass that transmits ultraviolet rays, and is not particularly limited and varies depending on the intended use, but Pyrex glass is usually used. The shape and size of the glass are not particularly limited either, and can be selected from various shapes depending on the purpose and use. The material, shape, size, etc. of the member are not particularly limited and may be selected depending on the purpose and use.

The partition wall is provided with temperature control means to prevent dew condensation. The temperature control means may be provided in the ultraviolet-transmitting glass constituting the partition wall, or may be provided in the partition wall itself.

The temperature control means for preventing dew condensation may be an ultraviolet-transmitting glass having a heating layer on at least one surface that generates heat by applying an electric field. The material of the heating layer is not particularly limited as long as it has a heat generating function and evaporates water droplets on the glass surface by heat generation, but indium tin oxide (hereinafter referred to as ITO) or the like is usually used. The specific resistance of the heating layer is preferably about 10-4 to 10-6 Ω·cm.

Further, the temperature & 111 means for preventing dew condensation is, for example, as shown in FIG.
a heat insulating chamber 2b consisting of a partition wall including b, and at least one
The air nozzle 9 may be provided with two air nozzles 9. The temperature of the air is not particularly limited, but is usually the temperature of the paper or slightly lower. The number of air nozzles is not particularly limited, and is usually one as shown in FIG. 2, and the location of the nozzles is also not particularly limited. The air nozzle 9 is usually a hot air valve or a hot air blower I! One aircraft is connected to 91. In this weather resistance tester, no condensation occurs on the surface of the ultraviolet transmitting glass facing the sample, and the intensity of light hitting the sample can be maintained stably. Note that, if necessary, the heating layer may be provided on at least one surface of the ultraviolet-transmitting glass facing the sample.

In such a case, when the temperature of the above-mentioned 4111 is low or when non-dry air is used, the occurrence of dew condensation can be prevented using J-3, and the condensation that occurs can be eliminated.

In the weather resistance tester of the present invention, as shown in FIG. 2, for example, when dry air at a predetermined temperature is poured into the heat insulation ff2b, at least one 1 air nozzle 8
The system can be equipped with the following. The predetermined temperature is usually 25 to 35°C. There may be a plurality of nozzles as shown in FIG. 2, or there may be one nozzle, and the installation location of the nozzle is not particularly limited. The nozzle 8 is normally connected to a cold air valve and further to a cold air blower 1!1i181. In this weather resistance tester, the circumference of the ultraviolet fluorescent lamp is 1)! Since the l temperature can be set to a temperature of about 25 to 35° C., the weather resistance tester can suppress a decrease in lamp life even when testing a sample at ^ temperature, and has a long life. As shown in Figure 2, this weather resistance tester, which flows dry hot air into the heat insulation chamber and cool air into the lamp chamber, prevents condensation and minimizes lamp deterioration, making it easy to replace. You can reduce the frequency.

In the weather resistance tester of the present invention, a shutter for blocking the amount of light can be provided between the ultraviolet transmitting glass constituting the partition wall and the sample. The shutter only needs to be capable of shutting out light that passes through the ultraviolet-transmitting glass, and its material, shape, etc. are not particularly limited, and the means for opening and closing the shutter is not particularly limited either. For example, as shown in FIG. 2, the blocking shutter 10 can be freely moved up and down by a lifting device 101 installed at the top of the test chamber 1a. Note that the shutter can be provided either in the case of having a partition wall having a heat insulating chamber 2b as shown in FIG. 2 or in the case of having a partition wall as shown in FIG. 1. In this weather resistance tester, the sample can be repeatedly irradiated and non-irradiated by keeping the ultraviolet fluorescent lamp turned on continuously without repeating turning it on and off. This weather resistance tester is i! I
n life and less decrease in light intensity.

It is preferable that a plurality of the ultraviolet fluorescent lamps are arranged in a planar or cylindrical shape. Further, the distance between the fluorescent lamp and the trial r1 holding shell is preferably set at a distance of 2 cm to 20 cm.

The test chamber consisting of the lamp chamber and sample chamber, which is a component of the weather resistance tester of the present invention, is essentially the same as the test chamber of a conventional tester. That is, it is a box-shaped body that forms a sample chamber, etc., and has a door, a ventilation hole, an exhaust hole, etc. for taking in and out the sample, etc.

The temperature/humidity control device for controlling the temperature/humidity in the sample chamber, which is a component of the weather resistance test acid of the present invention, is essentially the same as the temperature/humidity control device of a conventional tester. Specifically, the temperature and humidity control device includes an air heater that is turned on and off by a temperature sensor, and a humidifier that adjusts the inflow of water vapor by a humidity sensor. In addition, the temperature and humidity control device allows the temperature in the test room to be 20℃~
In terms of humidity, it is preferable that b has the ability to maintain any temperature between 90° C. and the ability to arbitrarily maintain a relative humidity of 50% to 90% by 1q in terms of relative temperature.

In the tester of the present invention, a water tank for immersing the sample can be provided in the sample chamber. This aquarium is preferably one in which the temperature of the water held therein can be freely controlled and is equipped with a stirrer for stirring the water in the aquarium. The sample holder for holding the sample is equipped with a lifting device that can be raised and lowered in the vertical direction, and the sample holder is equipped with a lifting device that can be raised and lowered in the vertical direction. Preferably one that can be lifted and lowered.

[Example] The present invention will be explained below with reference to Examples.

Example 1 A schematic cross-sectional view of the weather resistance tester according to Example 1 of the present invention is shown in FIG. 1. A sample holder 32 disposed along the inner wall surface on the opposite side; a partition wall including an ultraviolet transmitting lath 5 disposed between the ultraviolet fluorescent lamp 21 and the holder 32 and extending the heating layer to the right; The main components of the test tank 1 are a test tank 1 consisting of a It consists of a lamp chamber 2 that stores a light lamp and a sample 3. The ultraviolet fluorescent lamp 21 has a 20
W, its long axis was rearranged horizontally, and the lamp chamber 2
20 of them are arranged in parallel in the vertical direction with an interval of 5 mm between each side, and the entire surface of the side surface serves as a light emitting surface.

The sample holder 32 is a plate-like member, and the sample 31 is fixed to the surface thereof. Note that the final distance between the ultraviolet fluorescent lamp 21 and the sample 31 is 10 cm.

The ultraviolet transmitting glass is Pyrex glass (600x3
50x2. Omm), and the UV-transparent glass has [
, ITO film (thickness 0°3~0.8μ) on the transmitted light side.
) is sputtered. The ITOII! The specific resistance of is 3X10-4Ω・Cmte.

Note that the test chamber 1 is provided with a lid 6 at a portion corresponding to the upper ceiling, and vent holes 7 and 71 are provided at the upper side wall.

The temperature/humidity control device 4 is formed below the test W11, and includes an air inlet having a blower motor 41 and a heater 42 for taking in outside air, a hot water tank having a heater 43 provided on the floor of the sample chamber 3, and a hot water tank having a heater 43 installed on the floor of the sample chamber 3. In addition to the air deflector 44 provided at the top, it is comprised of a temperature sensor (not shown) and a humidity sensor (not shown) provided in the sample chamber 3.

Next, a weather resistance test of the coating film was conducted using the above test machine as follows.

First, a power supply (not shown) is applied to the temperature/humidity control device 4 in the lower part of the test chamber 1, and the atmosphere in the sample chamber 3 is changed to 2Aa +, ((50°C, i"iJ 1( 160
%Rl-1 control 11. A power source (indicated by U in the figure) is applied to the ultraviolet transmitting glass 5 on the right side of the heating layer, and a 2 mA current is applied to generate heat, raising the temperature to -50''C.

Next, one can 6 of the test tank 1 is removed, and a sample 31 is held therein in a sample holder 332. Then, the sample 31 is illuminated 134 with the ultraviolet fluorescent lamp 21 for 100 hours. The temperature inside the lamp chamber 2 of this 01 was 45°C.

Thereafter, the lid 6 of the test tank 1 is removed, the sample 31 is taken out, and the deterioration of the coating film is evaluated.

Furthermore, as described in 11C above, sample R31 is held on the sample holding plate 32 again and irradiated with light. Repeat the above process ().

Both of the above numbers 1 ([At the end of the test, the actual resistance test @ Iso), the sample 31 was irradiated with light while maintaining the light intensity uniformly without condensing on the ultraviolet transmitting glass 5. Furthermore, the temperature of the lamp chamber was 45°C, which could be lower than the temperature of the sample chamber of 60°C, and the life of the weather resistance tester could be extended.

Example 2 A schematic cross section of a weather resistance tester according to Example 2 of the present invention is shown in FIG.

This test machine is the test machine of Example 1, and mainly the following two for one machine.
There are two points of difference. One is two sheets of Pyrex glass <600X350X1゜Q mm) 5a placed between the lamp 21a and the sample 31a at a spacing of 2Ωmm,
5b, an air nozzle 9 for flowing dry air into the adiabatic space formed by the partition wall, and a plurality of air nozzles 8 for flowing cold air into the lamp chamber 2a. Another is that a lifting device 101 having a shutter 10 for blocking the amount of light was installed above the test chamber 1a. The other configurations were the same as the test machine of Example 1.

Next, using Test 1 described above, the q-film was subjected to a one-shot resistance test under intermittent light irradiation as follows.

Magi test tank 1. Power is applied to the device 4a at the lower part of the chamber 4a, and the atmosphere in the sample chamber 3a is controlled to a temperature of 60 degrees Celsius and a temperature of 60 degrees Celsius.

Similarly, when power is applied to the temperature Jfl air blower 1 and 91, the temperature from the air nozzle 9 is 55C, 7! Air at iJ degrees and 30% RH is ventilated into the heat insulating chamber 2b. Also, cold air blower 81
When power is applied to the lamp chamber 2a, cold air is blown from the air nozzle 8 into the lamp chamber 2a. After that, the ultraviolet fluorescent lamp 21
Irradiate the sample with light for 1 hour at a.

At this time, the temperature inside the lamp chamber a was 25°C.

Next is ff! The blocking shutter 10 is lowered by the lifting device 101 so that the light emitted from the lamp 21a does not illuminate the sample 31a. 30 in this state
hold for a minute.

Next, the light amount blocking shutter 10 is raised and lowered by the 'J device 101.
By the upper back! Initially set test If
Pull up to the upper standing mushroom in Ia. Then, the sample 31a is again irradiated with the light emitted from the rung for one hour.

Repeat the above process.

When light irradiation and non-irradiation were carried out continuously and alternately as described above, it was found that in the J5 resistance test, the light intensity was maintained uniformly without condensation on the surface of the ultraviolet transmitting glass on the sample side. can be irradiated with light, and the weather resistance tester has a longer lifespan.

(Effect of illumination) The weather resistance tester of the present invention includes a test scissors tank into which an ultraviolet fluorescent lamp and a sample are placed through a partition wall, and a temperature and humidity range of 1till III in the sample chamber in the test tank. A weather resistance tester comprising a humidity control device, the partition wall comprising an ultraviolet transmitting glass and having a temperature control means for preventing condensation between the ultraviolet fluorescent lamp and the sample. , the partition wall separates a lamp chamber in which the ultraviolet fluorescent lamp is housed from a sample chamber in which the sample is housed. That is, the temperature control means used in this weather resistance tester consists of ultraviolet-transmissive glass (or a glass with dry air at a predetermined temperature of 81 degrees Celsius) that has a heating layer that generates heat by applying an electric field to at least one surface of the glass. 4j insulation room
) can be spelled as something like that.

Therefore, it is possible to prevent dew condensation from forming on the surface of the ultraviolet-transmitting glass in this weather resistance test), and since it is provided with the above-mentioned partition wall, it is possible to prevent the ambient temperature of the upper 5d'#external fluorescent lamp from rising. is C monkey. Therefore, this one-bark resistance test has uniform light intensity and long life.

[Brief explanation of drawings]

Figure 1 is a schematic cross-sectional view of the i4 weathering tester used in Example 1. Figure 2 is the bark resistance test 1 used in Example 2.
There are several schematic cross-sectional views. 1.1a...Test tank 2.2a...Lamp chamber 2
b...Insulation chamber 2 above 1a...Ultraviolet fluorescent lamps 3, 3a...Test sample 3 1.31a...Sample 32.32a...Sample holder 4.4a... Temperature and humidity control device 41...Blower motor 42.43...Heater 44...Air deflector 5, 5a, 5b...Ultraviolet transmission glass 51...Partition wall component 6...Lid 7.71 ...Vent hole 8...Air nozzle for cold air 81...Cold air blower 9...Air nozzle for mff1 91...Hot air blower lit hoe 10...Shi V ivy 101...Elevating Device

Claims (6)

[Claims] (1) A weather resistance tester comprising a test tank into which an ultraviolet fluorescent lamp and a sample are placed through a partition wall, and a temperature and humidity control device that controls the temperature and humidity inside a sample chamber in the test tank. , between the ultraviolet fluorescent lamp and the sample is the partition wall containing ultraviolet-transmissive glass and equipped with temperature control means to prevent condensation; the partition wall houses the ultraviolet fluorescent lamp; A weather resistance tester characterized in that a lamp chamber and a sample chamber in which the sample is stored are isolated. (2) The weather resistance tester according to claim 1, wherein the temperature control means is an ultraviolet transmitting glass having a heating layer on at least one surface of which generates heat by applying an electric field. (3) The specific resistance of the heating layer is 10^-^4 to 10^-^6
The weather resistance tester according to claim 2, which is Ω·cm. (4) The temperature control means includes an insulating chamber consisting of a partition wall containing two ultraviolet-transmitting glasses with a desired gap between the lamp chamber and the sample chamber, and a device for flowing dry air at a predetermined temperature into the insulating chamber. A weather resistance tester according to claim 1, comprising at least one air nozzle. (5) The weather resistance tester according to claim 4, wherein the lamp chamber is provided with at least one air nozzle for flowing air at a predetermined temperature. (6) The weather resistance tester according to claim 1, further comprising a shutter for blocking the amount of light between the ultraviolet transmitting glass constituting the partition wall and the sample.