JPS60117129A - Pretester for weather proof test - Google Patents

Abstract

PURPOSE:To achieve accurate decision on the characteristic of deterioration by ultraviolet rays in lot-wise samples very quickly by irradiating the lot-wise samples with a very strong ultraviolet rays to promote the deterioration caused by ultraviolet rays using a water-cooled metal halide lamp before the samples are set on a weather proof (light resistance) tester. CONSTITUTION:A sample carrying base 8 is provided under a light source unit 4 housing a water-cooled metal halide lamp 2 in a reflector 3. The interval between the sample carrying base 8 and the metal halide lamp 2 is made adjustable while a sample put on the sample carrying base 8 is irradiated with ultraviolet rays with the intensity exceeding 50mW per 1cm<2>. Air is blown to the sample carrying base 8 with a blower 9 and air in the equipment is discharged with an exhaustor 10.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a pre-testing machine for carrying out a pre-testing of weather-resistant (light) eyelids made of plastics, fibers, paints, etc.

[Technical background of the invention and its problems]

Conventionally, when measuring the weather resistance (light) resistance of plastic materials, etc., weather resistance (light) eyelid testers according to JISE 7751 to 7754 have generally been used. These test machines are
Usually, a light source such as a carbon arc lamp or a xenon arc lamp is used, and the sample is irradiated with light from the light source to perform accelerated weather resistance (light) tests.

However, the intensity of UV irradiation on the sample in these testing machines is generally about 6 mW per 1 d of the irradiated surface, and it takes about several hundred watts to measure and determine the UV deterioration characteristics equivalent to one year of sunlight. It took more than time.

Moreover, the conventional method of subjecting each lot of samples to 100% testing has been a problem in that it takes a long time to measure and judge the results, making it extremely inefficient. Ta.

[Purpose of the invention]

One way to solve the above problems is to weatherize the sample (
Before being exposed to the eyelid testing machine, each loft sample is irradiated with extremely strong ultraviolet rays to accelerate UV deterioration, samples are selected according to the degree of deterioration, and only the necessary samples are subjected to weathering (light) testing. It is possible to apply it to a sex test machine. In this way, there is no need to subject all samples of each loft to a weathering (light) tester, making the test extremely efficient.

As described above, the present invention irradiates strong ultraviolet rays to the samples of each loft to determine the ultraviolet deterioration characteristics in a very short time before subjecting the samples to a weathering (light) tester. In other words, the purpose is to provide a pre-testing machine for conducting a pre-test of weather resistance (light) resistance.

It goes without saying that such a tester must be able to irradiate the sample with strong ultraviolet rays, but this must not cause the sample to become soft. Since it is still necessary to prepare a weather resistance (light) tester separately, it must be simple in structure, small in size with a lid, easy to handle, and economical. Must. Furthermore, the ultraviolet deterioration characteristics of the sample subjected to this pre-testing machine and the ultraviolet deterioration characteristics of the sample subjected to the weathering (light) resistance tester must show the same tendency.

This is because the pre-test is meaningless if the results show different trends.

An object of the present invention is to provide a pre-testing machine that satisfies these conditions.

[Structure and Examples of the Invention]

FIGS. 1(a) and 1(b) show a front view and a side view of a pre-testing machine implementing the present invention. In the figure, 1 is the main body of the testing machine, which roughly consists of an ultraviolet irradiation chamber 1a and an accessory storage chamber 1b. A light source device 4 comprising a water-cooled metal halide lamp 2 housed inside a reflector plate 3 is installed in the upper part of the ultraviolet irradiation chamber 1a. For example, the water-cooled metal halide lamp 2 is shown in Figure 2 (,)! (
As shown in b), an arc tube 6 is arranged at the center of an inner cylinder 5a of a water cooling jacket 5 configured to circulate a cooling liquid between an inner cylinder 5a and an outer cylinder 5b made of ultraviolet-transparent quartz glass. It is suitable that a filter 7 is installed between the inner cylinder 5a and the outer cylinder 5b. The arc tube 6 is, for example, as described in Japanese Patent Publication No. 58-18743,
Optimally, a quartz tube having at least one pair of electrodes is sealed with an iron halide together with an appropriate amount of mercury and a rare gas. This is because such an arc tube emits extremely large amounts of ultraviolet light in the wavelength range of 300 to 400 nm, which is necessary for ultraviolet degradation tests. Further, the filter 7 to be combined with the arc tube 6 has a weight ratio of 60 to 65, for example.
%8i0□, 15-20% Pb, 7-8% Na, 7-8% K, 1% CO, 1% Ni
A filter made of low melting point soft glass is suitable. By combining this filter with the arc tube 6, ultraviolet rays of 300 to 400 nm can be obtained extremely efficiently.

Note that the filter 7 is connected to the inner pipe 5a of the water cooling jacket 5.
If the filter 7 is installed directly around the arc tube 6 without being installed between the outer tube 5b and the outer tube 5b, the filter 7 will be immediately damaged by the radiant heat from the arc tube 6.

Next, the tester according to the present invention uses the light source device 4 as described above.
A sample mounting table 8 is provided at the bottom of the holder. The distance between the sample stage 8 and the metal halide lamp 2 of the light source device 4 can be adjusted by vertically moving the sample stage 8, the light source device 4, or both of the sleds. The reason for this configuration is to eliminate variations in the distance between the sample and the metal halide lamp 2 depending on the capacity of the metal halide lamp 2 and the thickness of the sample. - Then, by appropriately selecting the capacity of the metal halide lamp 2 and the distance between the metal halide lamp 2 and the sample, it is possible to apply p50 mW or more per 1 d to the sample, preferably 80 to 2
It is constructed and configured to irradiate ultraviolet rays with an intensity of 00 mW, particularly preferably 100 to 150 mW. Note that in order to uniformly irradiate the sample with ultraviolet rays, the sample mounting table 8 may be configured to be rotatable as necessary.

Furthermore, the testing machine according to the present invention is configured so that the blower 9 sends cooling air toward the sample mounting table 8, and the air inside the ultraviolet irradiation chamber 1a is exhausted by the exhaust device 10. be. When irradiating a sample with strong ultraviolet rays as described above, it is necessary to keep the temperature of the sample below about SOC to prevent the sample from deforming due to heat, but this requires a water-cooled light source as described above. This can be easily controlled by combining a metal halide lamp with a filter, cooling the sample using an air blower/exhaust device, etc. 1st
The table shows cases in which a water-cooled metal halide lamp alone is used (without filter), a filter is used in combination (with filter), and the sample is irradiated with ultraviolet rays of a certain intensity when the surface of the sample is irradiated. The graph shows the ultraviolet irradiation time and sample temperature when the following cooling means are used in combination (filter and sample cooling).

E 1 Table As is clear from this table, when a water-cooled metal halide lamp is combined with a filter and a cooling means for the sample is used, the sample can be irradiated with strong ultraviolet rays of 80 to 120 mW/cr/l for more than 100 hours. However, the sample temperature can be kept below 65C.

Note that cooling of the sample can be managed not only by controlling the volume and temperature of the cooling air but also by controlling the lamp input and the temperature of the sample mounting table. In addition, attached equipment storage room 1
Inside b, in addition to the power supply device and stabilizing device for the power source, a pump and cooler for the light source cooling water are housed.

In the above test apparatus, a metal halide lamp 2 with a rated input of 1.5 kW was used, and the distance between the metal halide lamp 2 and the sample was 10 crrL.
When the metal halide lamp 2 is turned on at the rated input, the intensity of ultraviolet irradiation on the surface of the sample on the sample mounting table 8 is approximately io.

mW/α2. This is approximately 10 to 15 times the ultraviolet irradiation intensity of a general weather resistance (light) tester, and if such strong ultraviolet rays are irradiated, the ultraviolet deterioration characteristics of the sample and the weather resistance (light) tester will be different. If the ultraviolet ray deterioration characteristics of the exposed samples have a similar tendency, the amount of UV rays required when using a weather (and light) tester is 1. This means that the ultraviolet deterioration characteristics can be determined in about 145 to 145 hours.

Therefore, as shown in the following test example, a sample made of vinyl chloride was subjected to a pre-testing machine and a weathering (light) resistance tester according to the present invention to examine the tendency and degree of ultraviolet deterioration.

The testing machine and test method used, as well as the test results, are as follows.

(1) Testing machine A) Pre-testing machine structure: Lamp used as shown in Figure 1 (a) and (b):
Metal halide lamp 1.5W Irradiation wavelength = 600-400nm Ultraviolet irradiation intensity on sample surface = 100±5 mVf'crd
Maximum sample surface temperature = 65C or less B) Weather resistance (light) tester model: WE-8UNHC manufactured by Toyo Rika Kogyo Co., Ltd. (testing machine used in the test method based on JIS A1415)
Lamp used: Carbon arc lamp 4 I (VA UV irradiation intensity on sample surface: 6 mW/cTL2 black panel temperature: 63 ± 30 Spray = 18 minutes/120 minutes (2) Test method Based on the color difference of the samples applied to each of the above test machines The tendency and degree of UV degradation were investigated.

In other words, calculate the total color difference before and after the test for each time sample obtained with the two test machines mentioned above, plot this on a graph with time on the horizontal axis and color difference on the vertical axis, and compare each sample with the same color difference. 9, the time ratio of the pre-testing machine and the weathering (light) resistance testing machine was determined, and the magnification of ultraviolet deterioration acceleration was determined.

The total color difference is OIE, which is the color system of the International Institute of Illumination in 1976.
L rice? ΔB (color difference) was calculated from b rice. As a color difference meter, C-100 manufactured by Minon Takamichi Co., Ltd. was used.

(3) Test result sample: Organotin-containing transparent rigid PVO sheet, thickness 0.4cm (Standard color: Y = 47.4 x = 0.3a7y =
0.311) Result: Table 2 (average magnification 12.7)
) Table 2 (Average 12.7) As is clear from the above experimental example, when the pre-testing machine according to the present invention is used, the data on the ultraviolet ray deterioration of the sample is
It was obtained in a much shorter time than when using a sex tester, and the difference was about 16 times. This almost coincides with the predicted value calculated from the difference in the intensity of ultraviolet irradiation on 1 d of the irradiated surface, and the ultraviolet deterioration characteristics of the sample when using the pre-testing machine according to the present invention are It was confirmed that the same trend was observed when applying . The temperature of the sample during the test was about 65C or less, and no deformation due to heat was observed even in hard vinyl chloride.

〔Effect of the invention〕

As described above, by using the pre-testing machine according to the present invention, it is possible to accurately determine the ultraviolet degradation characteristics of samples for each loft in a very short time. Therefore, if you select the samples that are subjected to the pre-testing machine according to the degree of UV deterioration, and only the necessary samples are subjected to the weathering (light) resistance tester, there is no need to subject all the samples for each loft to a 100% test. This makes testing extremely efficient. Further, the pre-testing machine according to the present invention has a simple structure in which a water-cooled metal halide lamp and a sample mounting table are provided relatively close to each other in an ultraviolet irradiation chamber, and a ventilation/exhaust device is provided. Therefore, it is small and lightweight, easy to handle, and economical. As described above, according to the present invention, it is possible to provide a test device for a pre-test of a weather resistance (light) test, which can fully achieve the intended purpose.

[Brief explanation of drawings]

FIGS. 1(a) and 1(b) are a front view and a side view of a pre-testing machine according to the present invention, respectively, and FIG. 2(a),
(b) is a front view and a side view of a water-cooled metal halide lamp used in the test machine, respectively. Continuation of page 1 @ Inventor Yoshio Kijima O Inventor Kinugasa Kobun Inside Dainippon Plastics Co., Ltd. 2-44 Awajicho, Higashi-ku, Osaka City Inside Dainippon Plastics Co., Ltd.

Claims (1)

[Claims] 1. A water-cooled metal halide lamp (2) with a reflector (
A sample mounting table (8) is provided at the lower part of the light source device (4) housed inside the light source device (6), and the distance between the sample mounting table (8) and the metal halide lamp (2) can be adjusted. 1cIIt4 on the sample placed on the mounting table (8) 50
It is configured to irradiate ultraviolet rays with an intensity of mW or more, and is also equipped with an air blower (9) that blows air toward the sample mounting table (8).
) and an exhaust device (10) for exhausting the air inside the device. 2. The water-cooled metal halide lamp (2) has an inner cylinder (
5a), and a filter (7) is installed between the inner tube (5a) and the outer tube (5b) of the water cooling jacket (5). A pre-testing machine according to claim 1. 3. Water-cooled metal halide lamp (2) arc tube (6
) is sealed with metal halides, mainly iron halides, along with mercury and rare gases, and in combination with filter (7) irradiates ultraviolet rays in the wavelength range of 00 to 400 nm. The pre-testing machine according to claim 2, characterized in that it is configured as follows. 4. The temperature of the sample placed on the sample mounting table (8) is maintained at 980°C or less by controlling the lamp input, cooling air volume and temperature, and the temperature of the sample mounting table during ultraviolet irradiation. A pre-testing machine according to claim 1, characterized in that: