JPH0640062B2 - Weather resistance tester - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] A weathering test in which a phenomenon in which a material actually deteriorates outdoors is subjected to accelerated deterioration by artificially controlling wind and rain and temperature and humidity using an artificial light source instead of the sun. It is about machines.

[Prior Art] As shown in FIG. 4, a weather resistance tester has a light source placed at the center of its test tank, and a sample rotating frame that rotates on a circumference centered on the light source is provided to attach the sample. A frame is hung on this, light irradiation is applied to the sample, and spraying is intermittently applied from a rainfall nozzle as artificial rainfall to perform a weather resistance test. The sample frame used heretofore is shown in FIG. 5 to which a plate sample having a size of 70 × 150 mm and a thickness of 1 to 2 mm is mounted. In this sample frame, a plate-shaped sample can be mounted vertically and can be mounted only at a sample temperature of about 63 ° C. in a static state where no elongation is given. Further, the contact surfaces of the sample and the sample frame are hollowed out in order to improve heat dissipation of the sample. Therefore, the sample cannot be maintained at a high temperature of 80 ° C. or higher.

[Problems to be Solved by the Invention] Many of the materials actually used outdoors are in a state in which tensile stress is applied, or when water is squeaky at the water's edge and water, such as in the state of using pool or roofing material. There are parts that are splashing, and the state placed in these states undergoes more severe deterioration than usual. In addition, in the recent construction method that uses a heat insulating material for the backing like the roof material, heat is accumulated and the roof material is
The temperature is higher than 0 ° C.

The weather resistance tester is also required to reproduce the acceleration under such conditions, but the conventional weather resistance tester does not meet this requirement.

[Means / Actions for Solving Problems] In a natural environment, such as a plastic roofing material and rain gutter material, when the material is stressed and heated to the outside temperature, When the water naturally flows down, the hot water will wash off the surface of the material, and various additives in the material will elute, which will be chemically secondary products chemically changed by air or water (for example, hydrolysis of stabilizer calcium stearate). Water containing free stearic acid produced by the above, or the hydrolysis and oxidation of the plasticizer dibutyl phthalate and phthalic acid), and light, air, temperature, etc. simultaneously act on the submerged or semi-submerged material in this water, It causes a complicated material deterioration phenomenon.

The present invention was made in order to reproduce this phenomenon by an accelerated test. According to the present invention, the sample holder used in the weather resistance tester has the same sample [[ It is possible to simultaneously carry out the test of “light irradiation with a beam” + {Rainfall (shower)} and the test of [{on the edge of the water or with splashes} + {Light irradiation}] in a compact manner. Moreover, when the sample is plastic or rubber, secondary effects due to the elution of additives may be considered, as described above, and the water containing this eluate is tested in [{on the edge of water or in a state of being splashed with water} + {light irradiation}] Since it acts as a spray of water, it is a test in which photodegradation is further accelerated.

The purpose of the present invention is to make it possible to carry out an accelerated test in such a complicated deterioration cycle due to the natural environment under the condition as close as possible to the natural environment.

That is, the sample holder is a sample semi-submersion mechanism consisting of an extension heat retention mechanism for imparting elongation to the sample and holding the sample temperature at a high temperature, and an inclined shallow dish-like water reservoir for creating a condition equivalent to wetting at the water's edge. It consists of and. Moreover, it has a feature that the shower water poured into the stretched sample can be used as it is for submerging the sample.

The extension mechanism clamps the lower end of the sample between the fixed sample holder and the sample holder and fixes it to the sample holder, and the upper end of the sample is clamped between the movable sample holder and the sample holder and fixed to the sample holder. The extension adjustment screw vertically attached to the center of the holder is screwed into the movable sample holder and the movable sample holder moves up and down according to the rotation of the elongation adjustment screw to give the sample the required elongation. To Further, in order to keep the sample temperature at a high temperature, a heat insulating material is brought into close contact with the back surface of the sample, and this is held by a holding plate to prevent heat radiation from the back surface of the sample, thereby enabling high temperature holding.

On the other hand, the water reservoir is in the shape of a shallow dish that slopes downward toward the light source, and when the sample is immersed in this water reservoir, part of it is immersed in water and the other part is exposed, allowing you to set it as a waterside condition. The shower water applied above the sample stretched by means of the structure flows down the sample surface and enters the water reservoir.

[Embodiment] An embodiment is shown in FIG. 1 and will be described in detail below. The holder substrate 1a is made of a corrosion-resistant material (for example, stainless steel plate) and has a rectangular central portion, and both ends of the long sides are bent to have a U-shaped cross section. Two upper end portions in the longitudinal direction are used for hooking. Attach the nail 1b. On the other hand, a hooking claw 1c consisting of three pieces is attached to the lower end, and the structure is such that it can be hooked and fixed to the upper frame and the lower frame of the sample rotating frame of the weather resistance tester, respectively.

A screw mechanism 4 is provided on the holder substrate 1a. That is, a prismatic extension adjusting screw 4b holding base 4a is fixed to a holder base plate 1a, and an extension adjusting screw 4b having a knob with a support washer at the top is inserted in the center of the holding base 4a.
There is no screw groove in the portion where the elongation adjusting screw 4b and the loose fitting hole 4c are in contact with each other, and the loose fit hole 4c is fitted in a free state. Further, a stopper washer 4d for preventing the extension adjusting screw 4b from coming off the holding table 4a is fixed to the extension adjusting screw 4b below the holding table 4a. A female thread groove adapted to the male screw of the elongation adjusting screw 4b is provided at the center of the prismatic movable sample holder 5a, and is screwed to the elongation adjusting screw 4b.

At both ends of the movable sample holder 5a, stats 5b and 5b 'are erected vertically to the female screw groove direction, and are inserted into the long grooves 5c and 5c' of the holder substrate 1a, respectively. At both ends of a cylindrical sample retainer 5d with a non-slip groove, a stud 5b,
Stud 5b by opening play holes according to the pitch of 5b ',
5b ', and the knurled nuts 5e and 5e' are used to press the sample holder 5d against the movable sample holder 5a.

The fixed sample holder 3 is attached below the holder substrate 1a. That is, the fixed sample pressing base 3a having a prismatic shape is fixed, the stats 3b and 3b 'are erected in the same manner as the movable sample pressing base 5a, and the sample pressing 3c having the loose fitting holes corresponding to the pitch is fitted to this. The knurled nuts 3d and 3d 'allow the fixed sample holder 3a and the sample holder 3c to be freely tightened.

The sample 2 is sandwiched between the upper end of the sample 2, the movable sample holder 5a and the sample holder 5d, and the knurled nuts 5e and 5e 'are rotated to press the sample 2 with the sample holder 5d to fix it to the movable sample holder 5a. Similarly, the lower end of the sample is sandwiched between the fixed sample holder 3a and the sample holder 3c, and the knurled nuts 3d and 3d 'are provided.
Is turned to press the sample with the sample holder 3c to fix it to the fixed sample holder 3a.

When the elongation adjusting screw 4b is rotated clockwise here, the movable sample holder 5a moves in a direction approaching the elongation adjusting screw holder 4a.

At this time, the sample 2 is pulled so that the fixed sample holder 3
A tensile stress is generated between the movable sample retainer 5 and the movable sample retainer 5, and the stress acts as a force for pulling the elongation adjusting screw holding base 4a in the direction of the movable sample retainer 5 via the elongation adjusting screw 4b. Since it is fixed to the tool substrate 1a, the tensile stress of the sample is in equilibrium and the sample is fixed in a pulled state.

When the sample is thin, both ends of the sample retainer 5d are notched so that both ends of the sample retainer do not press the holder substrate 1a.
f is provided and has a play with the holder substrate 1a.

Similarly, both ends of the sample holder 3c are notched.
Further, an L-shaped upper plate pressing metal fitting 7a and a lower plate pressing metal fitting 7b are attached to the holding table 4a and the fixed sample pressing table 3a, and the heat insulating material 6 is applied to the back surface of the sample 2 so that the pressing plate 7 is superposed thereon. It is designed to be fitted into a plate retainer fitting and fixed with four plate retainer screws 7c.

A water reservoir 8 is provided on the lower light source side of the fixed sample holder 3,
As shown in FIG. 2, the water reservoir is in the shape of a shallow dish having a bottom surface inclined downward to the light source side, and the rising wall portion 8a of the light source side end is lower than the bottom end of the holder substrate 1a side end portion. It is in a position. Further, the width of the tip of the water reservoir 8 is narrowed so that the water reservoirs 8 do not collide with each other when they are used side by side. The sample 9 is installed on the bottom of the water reservoir 8 and the sample holding frame 10 is placed on the sample to prevent the sample from warping and floating.

Thus, when the sample holder 1 is held on the sample rotating frame of the weather resistance tester and the sampler is operated, the light from the light source is extended vertically to the sample 2 and the sample submerged in the water reservoir. Nozzle hole 11a or 11 'of the shower nozzle 11 or 11' installed above the sample 2 by irradiating 9
The water ejected intermittently from a becomes a water drop that drops like a curtain, forms a water film on the surface of the sample, and flows downward.
The water that has flown into the water reservoir after dropping onto the wall drops over the wall portion 8a.

As shown in FIG. 2, the sample 9 placed on the bottom of the one-sided slope.
The lower half is submerged in water, and the upper half is exposed from the water surface, and the boundary part corresponds to the state near the water. Further, when the water film on the surface of the vertical sample 2 flows into the water reservoir, water droplets drop on the exposed portion of the sample 9 to create a water splash state at the edge of the water.

[Effect of the Invention] By using the weather resistance tester of the present invention, conventionally, only the weather resistance test in a state of being simply mounted on a normal sample frame could be performed, but the test in a state close to the actual condition outdoors, that is, the sample It is possible to perform a high temperature weathering test in a state where elongation is applied (a state where tensile stress is applied), and at the same time, when the water is splashed by the water on the roof material or pool material It has become possible to conduct a weather resistance test. As a result, a result extremely similar to the result obtained by actually using it outdoors can be obtained in a short time, and it greatly contributes to the improvement of weather resistance.

[Brief description of drawings]

Fig. 1 Diagram for explaining the sample holder and shower nozzle structure of the present invention Fig. 2 Diagram for showing cross section of water reservoir Fig. 3 Diagram for explaining other shower nozzles Fig. 4 Example of weather resistance tester Fig. 5 Conventional Sample frame 1 …… Sample holder 2 …… Sample 3 …… Fixed sample retainer 4 …… Screw mechanism 5 …… Movable sample retainer 6 …… Heat retaining material 7 …… Pressing plate 8 …… Water reservoir 9 …… Sample 10 …… Sample holding frame 11 …… Shower nozzle 12 …… Automatic control device

Claims (1)

[Claims] 1. A weathering tester having a light source placed in the center of a sample chamber and having a sample frame rotating around this light source. A sample holder 1 attached to a sample rotating frame holds a sample 2 vertically and a sample 2 The bottom edge of the sample holding substrate 1
Hold the fixed sample holder 3 fixed to a and the upper end of the sample 2,
Movable sample holder 5 that stretches sample 2 by screw mechanism 4
And the heat insulating material 6 for preventing heat radiation from the irradiation back surface of the sample, and the heat insulating material 6
From the upper part of the sample 2 by an extension heat retaining mechanism composed of a holding plate 7 for fixing the nozzle, a shower nozzle 11 for spraying water in a curtain shape provided in the test chamber, and an automatic control device 12 for intermittently operating the spray. Shower water is poured to rinse the surface of the sample 9, and the sample 9 that does not stretch is tilted so that the end on the light source side is slightly downward, and the shower water is wet after the water has flowed down and the dropped water Shallow dish-shaped sump 8 with a sloping bottom for holding it so that it is submerged in a puddle
Is integrally joined to the sample holding substrate 1a in an L shape at a position where the exposed end of the sample 9 is directly below the fixed sample holder 3, and is further placed on the sample 9 submerged to remove the floating and warping of the sample. It is composed of a sample submersion mechanism composed of a sample holding frame 10 for preventing, and the sample 2 is irradiated with light while pouring the intermittent shower water, and the sample 9 is dropped with the intermittent shower water flushing the sample 2 and 9 is a weather resistance tester, which is capable of irradiating light in a state of being submerged in the dripping water.