KR100680397B1 - Accelerated weathering test method and equipment for automotive parts - Google Patents

Abstract

The present invention relates to an accelerated weather resistance test method and test apparatus applied for life prediction of automotive exterior parts materials.

Unlike the conventional method, the accelerated weathering test method of the present invention considers the effect of dust particles and increases the amount of irradiation light according to the distance so that the tester can more accurately reproduce the actual sunlight and the natural environmental conditions in the accelerated weathering evaluation.

In addition, accelerated weathering tests can be carried out faster than existing test methods, and the optimal test method is developed for product development according to the composition of various test modes to improve reproducibility, shorten development schedule, reduce development cost, and improve product quality. You can expect the effect of.

Automotive parts, accelerated weather test, dust spray, mirror device

Description

Accelerated weathering test method and equipment for automotive parts

1 is a flow chart showing a conventional accelerated weathering test method

2 is a flow chart showing the accelerated weathering test method according to the present invention

Figure 3 is a schematic front view showing an accelerated weather resistance test apparatus according to the present invention

Figure 4 is a schematic plan view showing an accelerated weather resistance test apparatus according to the present invention

5 is a schematic front view showing an operating state of the accelerated weather resistance test apparatus according to the present invention;

<Explanation of symbols for main parts of drawing>

10: lamp 20: black panel

30: pure water nozzle 40a, 40b: actuator

50: dust nozzle 60: mirror device

The present invention relates to an accelerated weather resistance test method and test apparatus applied for life prediction of automotive parts, and more particularly, to complex environmental effects such as influences caused by external dust and changes in the amount of ultraviolet light due to the difference in latitude of the sun. By providing a test method and apparatus employing a mirror means for amplifying the amount of ultraviolet light, it is possible to more accurately reproduce the actual sunlight and natural environmental conditions, and at the same time increase the amount of ultraviolet radiation up to 2 times. Accordingly, the present invention relates to a method and test apparatus for accelerated weather resistance of automobile parts that can shorten the development schedule, reduce development costs, and improve product quality by performing accurate and rapid acceleration tests.

In general, automotive parts, especially organic materials used in automobile interior and exterior materials, paints, plastics, and all products used outdoors, are subject to aging such as discoloration, loss of gloss, and cracks caused by sunlight, moisture, and temperature changes during use. Is being investigated.

The weather resistance test is a test to measure the aging degree of materials due to the natural environment. Based on the test results, the weather resistance evaluation is carried out to evaluate the environmental durability and quality of the material and to determine whether it is applied or to predict the life of the product.

Weathering evaluation can be divided into two categories: outdoor exposure test and accelerated weather test.

The outdoor exposure test is a test performed by exposing parts to actual natural conditions at a certain place, and the accurate durability of the parts can be measured, but the test time is very long.

Therefore, accelerated weathering tests must be performed to understand the weathering performance of parts within the short-term parts development schedule when developing exterior parts exposed to the sun and the external environment.

Accelerated weathering test methods for automotive exterior parts that are currently applied include: xenon-acramtic weather resistance test, sunshine carbon arc-type weather resistance test, ducycle sunshine carbon-aclamp type weather resistance test, ultraviolet auto fade meter, metal halide lamp weather resistance test Although it has been used, most of the industry's test standards are SAE J1960, SAE J2527, a test standard method of the American Society of Automotive Engineers (SAE), and xenon-amplified weather resistance test is applied.

For example, as shown in FIG. 1, the weather resistance test is a step of spraying pure water for 60 minutes under the condition of no ultraviolet irradiation and the temperature of the black panel at 38 ° C., and 40 at the temperature of the black panel at 70 ° C. Irradiating ultraviolet rays (irradiation: 1.32) for 1 minute, irradiating ultraviolet rays (irradiation: 0.66) for 20 minutes under the condition that the temperature of the black panel is 70 ° C, and spraying pure water at the same time; Irradiation of ultraviolet rays (irradiation: 1.98) for 60 minutes under the conditions of ℃.

Here, the dosage unit is kJ / m ² / nm ¹ (0.55W / m ² / nm ¹ , 340 nm).

This accelerated weathering test is a test performed by reproducing natural conditions with specific equipment in a laboratory, and the test results can be quickly known, while the limitation of accurate natural environment reproduction of the device and the test results differ depending on the device. have.

Existing test methods do not consider accurate natural environment reproduction as follows.

First of all, it is overlooking the chemical invasion of parts or acceleration of aging rate due to external dust, and there is a problem about test speed and reproducibility because it does not consider the change of UV light quantity due to the difference in solar latitude according to region and season. .

One example is the effect of yellow dust that is prevalent in spring and spring in Korea and Japan.

The size of the yellow sand distributed in the air is usually very small particles with a diameter of less than 10 ㎛, heavy metals, sulfurous acid gas, nitrogen oxides, hydrocarbons, etc. are attached to these small sand particles.

Thus, the dust is combined with the air pollutants due to the environmental pollution in the area can act as a chemical factor in the weather resistance test, and combined with the surface of the part to create an oxidizing atmosphere at the boundary between the dust particles and the part.

Accordingly, invasion by moisture, external chemicals, etc. may be accelerated or aging by solar energy may be promoted.

The existing SAE J2527 test method has a fixed UV irradiation distance, so the amount of UV light emitted per cycle of test mode is determined.

Although the amount of ultraviolet light determined per cycle has been derived from the existing test method using the existing sunshine carbon arc lamp, the exact basis for determining the amount of light cannot be found, and it is necessary to vary according to the test method. Esau has no choice but to increase the amount of ultraviolet light emitted by time.

Therefore, in order to secure long-term weather performance, a test period of at least a year unit is required, and the burden of development cost increases accordingly.

Therefore, it is necessary to develop a test method that can shorten the development period by adjusting the amount of ultraviolet light to be irradiated according to the tester's test purpose and outdoor exposure test data.

It is an object of the present invention to compensate for the shortcomings of the basic method in consideration of the complex environmental effects as described above, and to provide a test method and apparatus that allows a tester to develop a reproducible test mode with a more accurate test.

First, the present invention includes a test mode for spraying dust particles, unlike the existing SAE J2527 test method in consideration of the dust particles effect in a complex environment.

The dust particle spray test mode can be appropriately applied, and provides a test method considering compatibility with data implemented by existing accelerated test methods.

The dust particles used in the dust particle spray test mode of the present invention used fine particles of 1 to 50 μm, and spray the dust particles in a dry environment for a predetermined time at a position as shown in the drawing.

Next, in the present invention, by aging the ultraviolet irradiation environment by the adjustment of the irradiation distance to promote the aging of parts more, or to adjust the test method suitable for each region.

In addition, by installing a mirror with a variable angle in the upper part of the tester, the test time can be shortened by amplifying the ultraviolet irradiation light by up to 2 times.

Therefore, the present invention includes a test mode in which such distance adjustment and mirror reflection adjustment are possible.

The present invention for achieving the above object in the accelerated weather resistance test method of automobile parts, determining whether or not dust spraying and mirror amplification, and the conventional method without dust spray and mirror amplification when dust spray and mirror amplification OFF Ultraviolet ray irradiation and pure water spraying, and performing pure water spraying for 60 minutes in the non-irradiating state at 38 ° C. of the black panel when dust spray and mirror amplification are turned on, and irradiating for 40 minutes at 70 ° C. of the black panel. (Irradiation amount: 1.32 + alpha kJ / m 2), performing ultraviolet irradiation (irradiation amount: 0.66 + alpha kJ / m 2) and pure spray for 20 minutes at 70 ° C. in the black panel, and black panel at 70 ° C. Ultraviolet ray irradiation (irradiation: 1.98 + α kJ / m 2) for 60 minutes and dust spraying for a predetermined time period. .

In addition, the amount of ultraviolet radiation amplified by the mirror can be adjusted according to the angle of the mirror.

Further, the ultraviolet irradiation amount α amplified by the mirror is characterized by having a range of 0.5 to 1 times the lamp irradiation amount.

In addition, the dust spray is characterized in that performed for 1 to 60 minutes.

In addition, the dust particles used in the dust spray is characterized by having a size of 1 to 50㎛.

In addition, the dust particles are characterized in that it comprises any one of sulfur dioxide (SO2), Knox (NOx), soot (PM-10, PM-2, 5), other products.

On the other hand, the present invention for achieving the above object in the accelerated weather resistance test apparatus for automobile parts including a lamp for ultraviolet irradiation, a black panel for heating parts, a pure nozzle for pure water spray, the lamp is a component by an actuator It is possible to adjust the distance to increase the amount of ultraviolet irradiation light, characterized in that it further comprises a dust nozzle capable of dust spray for a predetermined time while the position is adjusted by the actuator.

In addition, it is characterized in that it comprises a plurality of mirror devices disposed on the upper portion of the lamp to reflect the light emitted from the lamp to the component side.

In addition, the mirror device is characterized in that it is possible to fold and unfold the angle at the same time.

In addition, the mirror devices are characterized in that installed in a structure arranged side by side while being one-to-one speed to match the alignment state of the parts.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

2 is a flow chart showing a accelerated weathering test method according to the present invention.

As shown in FIG. 2, first, a process of determining whether or not to spray dust and whether to mirror amplification is performed.

At this time, the dust spray time can be determined in the range of 1 to 60 minutes.

Subsequently, once the dust spray or mirror amplification (ON / OFF) is determined, the accelerated weathering test can be carried out in two ways depending on the determination.

For example, when dust spray and mirror amplification OFF, ultraviolet irradiation and pure water spray are performed by a conventional method without dust spray and mirror amplification.

That is, the step of spraying pure water for 60 minutes under the condition that the black panel temperature is 38 ℃ without the amount of ultraviolet radiation, and irradiating ultraviolet light (irradiation: 1.32) for 40 minutes under the condition that the black panel temperature is 70 ℃ and , Irradiating ultraviolet rays for 20 minutes at the temperature of the black panel at 70 ° C (irradiation amount: 0.66) and spraying pure water, and irradiating ultraviolet rays for 60 minutes at the temperature of the black panel at 70 ° C (irradiation amount: 1.98), the accelerated weathering test is performed.

On the other hand, when the dust spray and mirror amplification are turned on, pure spray is performed for 60 minutes in the non-irradiated state at 38 ° C. under the black panel, and ultraviolet irradiation (irradiation: 1.32 + α) is performed at the black panel at 70 ° C. for 40 minutes. Performing steps, ultraviolet irradiation (irradiation: 0.66 + α) and pure spray for 20 minutes at 70 ℃ black panel conditions, ultraviolet irradiation (irradiation: 1.98 + α) for 60 minutes at 70 ℃ black panel conditions and 1 Accelerated weathering is tested by sequentially performing the dust spray for ˜60 minutes.

Here, when amplifying the ultraviolet irradiation amount by using the mirror, it is possible to control the irradiation amount by varying the angle of the mirror, the ultraviolet irradiation amount α amplified by the mirror may have a range of 0.5 to 1 times the lamp irradiation amount. .

In addition, it is preferable that the dust particles used in the dust spray have a size of 1 to 50 μm, and if the dust particles are too fine or excessively out of the above range, the application of the test method is different from the use environment which affects the actual weather resistance. Not suitable as

In addition, the dust spray can be carried out for 1 to 60 minutes, the amount of approximately 50 to 100g per minute can be sprayed.

<Example>

My intensity tester is the same as the ultraviolet region to 340nm adjust the xenon lamp is irradiated the light amount of 0.55W / m ² in a 10cm X 15cm of poly seutailren plate (red color using the organic dye) as defined in the existing SAE Test Method 500 hours After irradiation, the degree of discoloration was measured by CIB LAB ΔE ^* value using a color meter (BYK Gardner).

The lamp filter used was an extended filter.

-Test mode and test equipment

1) Example 1: Instead of 60 minutes of irradiation of CYCLE4 in the existing test method,

             30 minutes of irradiation + 30 minutes of dust spray mode

2) Example 2 Example 1 + using a mirror device

3) Example 3: Example 1 + 10cm approximate distance of irradiation (no mirror device)

4) Example 4 Example 1 + using a mirror device + 10 cm approx.

5) Comparative Example 1: using SAE J2527, Q-SUN (Q-Panel) equipment

6) Comparative Example 2: using SAE J2527, Ci-4000 (ATLAS company) equipment

As shown in the test evaluation results according to the Examples and Comparative Examples of Table 1, compared to the comparative example, more severe weather resistance evaluation is possible by irradiating more ultraviolet light quantity in the same test time as the dust particles similar to the actual examples. Able to know.

3 and 4 is a schematic front view and a plan view showing the accelerated weathering test apparatus according to the present invention.

3 and 4, the accelerated weather resistance test apparatus of the present invention includes a lamp 10 for ultraviolet irradiation, a black panel 20 for heating parts, a pure nozzle 30 for pure spray, and the like. These facilities are installed in a chamber facility having a predetermined volume.

In particular, the lamp 10 is able to adjust the distance to the component by the actuator 40a to increase the amount of ultraviolet irradiation light.

For example, a method of adjusting the distance between the lamp 10 and the parts may be adopted by attaching the lamp 10 to a rod of an actuator such as a cylinder supported on the upper portion of the chamber facility.

The distance control method of the lamp 10, that is, the ultraviolet irradiation distance control method can increase the amount of ultraviolet light irradiated to the component up to two times.

In general, the amount of ultraviolet light increases in inverse proportion to the square of the distance, so the amount of irradiation light increases by 56% when it approaches 10 cm from the existing 50 cm.

In this way, it is possible to accelerate and test component aging by controlling the UV irradiation environment, or to select a test method suitable for local characteristics and perform the test.

In addition, the accelerated weather resistance test apparatus of the present invention further includes a dust nozzle 50 capable of dust spraying.

The dust nozzle 50 may also be installed in a structure that is mounted on a rod of an actuator such as a cylinder supported on an upper portion of the chamber facility.

The dust nozzle 50 can be moved up and down position by the operation of the actuator 40b, and thus, when spraying the dust can be lowered to perform the dust spraying.

The dust nozzle 50 may be connected to a dust supply pump (not shown) to receive dust.

Such a dust nozzle 50 can be located at the top of the chamber or the edge between the lamp 10 and the components in the chamber (tester) as shown in the drawing, and can spray dust with air depending on the test mode. .

In this case, the dust particles to be sprayed may have a size of 1 to 50 μm, and in some cases, may include sulfur dioxide (SO ₂ ), nox (NOx), soot (PM-10, PM-2, 5), and other acid substances.

When the dust particles are sprayed, the dust nozzle 50 may be selectively positioned on an upper portion of the mirror device 60 to be described later in order to prevent contamination of the lamp 10 in the chamber facility.

In addition, the accelerated weather resistance test apparatus of the present invention includes a plurality of mirror devices 60 which are arranged on the upper portion of the lamp 10 and can reflect the light emitted from the lamp 10 to the component side.

The mirror device 60 has a structure in which the mirror device 60 can be folded and unfolded, and the angle can be varied.

These mirror devices 60 are installed in a one-to-one speed to match the alignment of the parts, that is, arranged one by one in the upper portion for one component, arranged side by side horizontally on the top of the component.

Here, the rotation operation of the mirror device 60 may be implemented in a conventional manner using an electric motor and an electric signal, and the folding and unfolding operation may also be implemented in a conventional manner using an electromagnet and an electric signal.

That is, the mechanism for rotating, folding and unfolding the mirror device can be adopted without particular limitation as long as it is a method commonly known in the art.

Such a mirror device 60 is located above the 5-10cm from the lamp 10 in the chamber facility, thereby providing an effect of increasing the light reflected by the second by 50%.

Therefore, it is possible to expect the effect of increasing the amount of light up to 2 times by the simultaneous effect of the ultraviolet irradiation distance control and the mirror device.

Each mirror device 60 can be manufactured to a size similar to the size of the parts, as shown in the figure by adjusting the angle up to two mirror devices 60 at the same time irradiating a single part to investigate a specific part The amount of light may also be increased.

5 is a schematic front view showing an operating state of the accelerated weather resistance test apparatus according to the present invention.

As shown in FIG. 5, the accelerated weathering test apparatus includes a predetermined control logic for the accelerated weathering test method (for example, a program for dust spray and mirror amplification in a program for a conventional accelerated weathering test method). Control logic).

First, after determining whether or not to spray dust and whether to amplify the mirror, a lamp, a pure nozzle, a dust nozzle, a mirror device, and the like are operated in each stage.

As a first step, pure water spray by the pure water nozzle 30 is performed in the non-irradiated state of the lamp 10.

At this time, the lamp 10 and the dust nozzle 50 is to maintain the upward state of the mirror device (60).

As a next step, after about 60 minutes of pure water spray, ultraviolet irradiation by the lamp 10 is performed.

The operation of the actuator 40a causes the lamp 10 to move downward and be positioned on the top of the part.

At this time, the distance between the lamp and the component can be adjusted by setting the stroke of the actuator 40a.

That is, in the conventional accelerated weather resistance test apparatus, the distance between the lamp and the part is fixed, so that the amount of ultraviolet light exposure per hour is fixed, but the accelerated weather resistance test apparatus of the present invention can adjust the ultraviolet irradiation distance, and thus increase the amount of ultraviolet irradiation light in some cases. You can.

On the other hand, when the mirror apparatus 60 is applied to the test apparatus of the present invention, the mirror apparatus 60 can be kept closed or bent at a predetermined angle during ultraviolet irradiation by the lamp 10. do.

Accordingly, when the mirror device 60 is positioned above the lamp 10 by about 5 to 10 cm, the amount of light reflected by the secondary light can be increased by about 50%, and the mirror device 60 is adjusted at a predetermined angle. Thus, if two mirrors simultaneously irradiate one part, the amount of irradiation light of a particular part may be increased.

Ultraviolet irradiation by the lamp 10 is performed one time alone, and one time in parallel with the pure spray.

As a final step, ultraviolet irradiation and dust spraying are performed together.

By operating the actuator 40a, the dust nozzle 50 is lowered to perform dust spray on the parts, and at the same time, ultraviolet irradiation by the lamp 10 is performed.

When the mirror device 60 is applied, the dust nozzle 50 may descend after the mirror device 60 is folded.

Each step of the pure spray, ultraviolet irradiation, ultraviolet irradiation + pure spray, ultraviolet irradiation + dust spray is repeated sequentially, and the accelerated weathering test is performed.

As described above, the present invention can provide a test method that can more accurately reproduce the actual sunlight and natural environment conditions when the accelerated weather resistance evaluation to the tester can proceed the accelerated test faster than the conventional test method.

In addition, by configuring a variety of test mode for the tester can develop the optimal test method for the developed product.

By reproducing such accurate test and facilitating faster test, it is possible to shorten development schedule, reduce development cost, and improve product quality.

Claims (10)

In the accelerated weathering test method of automobile parts, Determining whether or not dust spraying and mirror amplification, UV irradiation and pure spray in the usual manner without dust spray and mirror amplification when dust spray and mirror amplification OFF, black panel when dust spray and mirror amplification ON Performing pure spray for 60 minutes in an ultraviolet non-irradiated state at 38 ° C. conditions, performing ultraviolet irradiation (irradiation amount: 1.32 + α kJ / m 2) for 40 minutes under black panel 70 ° C., and black panel 70 ° C. Performing ultraviolet irradiation (irradiation amount: 0.66 + αkJ / m2) and pure spray for 20 minutes under the conditions, and ultraviolet irradiation (irradiation amount: 1.98 + αkJ / ㎡) for 60 minutes at 70 ° C of a black panel, and dust for a predetermined time. Accelerated weathering test method for an automotive part comprising the step of performing a spray. The method according to claim 1, wherein the amount of ultraviolet radiation amplified by the mirror can be adjusted according to the angle of the mirror. delete The method according to claim 1, wherein the dust spray is carried out for 1 to 60 minutes. The method of claim 1 or 4, wherein the dust particles used for the dust spray have a size of 1 to 50 µm. The method of claim 5, wherein the dust particles, sulfur dioxide (SO2), NOx (NOx), soot (PM-10, PM-2, 5), promoting weather resistance of the automotive parts, characterized in that any one of Test Methods. In the accelerated weather resistance test apparatus for automobile parts, including a lamp 10 for ultraviolet irradiation, a black panel 20 for heating parts, and a pure nozzle 30 for spraying pure water, The lamp 10 is capable of adjusting the distance to the component by the actuator 40a so as to increase the amount of ultraviolet radiation. The lamp 10 is positioned by the actuator 40b and the dust spray is applied for a predetermined time. Accelerated weathering test apparatus for automobile parts, characterized in that it further comprises a dust nozzle (50) possible. 8. The accelerated weather resistance of automobile parts according to claim 7, characterized in that it comprises a plurality of mirror devices (60) disposed on the lamp (10) and capable of reflecting the light emitted from the lamp (10) on the part side. Test equipment. The apparatus according to claim 8, wherein the mirror device (60) is capable of being folded and unfolded and at the same time changing the angle. 10. The apparatus according to claim 8 or 9, wherein the mirror devices (60) are installed in a side by side arrangement while being arranged one to one in accordance with the arrangement of the parts.

Images