A method for verifying the performance of an electroluminescent paint coating

Abstract

The application discloses a performance verification method of an electroluminescent paint coating, and verifies the stone chip resistance, low-temperature falling hammer impact resistance, high-temperature storage resistance, low-temperature storage resistance and light aging resistance of an electroluminescent paint coating test plate respectively. After the stone chip resistance, low-temperature falling hammer impact resistance, high-temperature storage resistance, low-temperature storage resistance and light aging resistance of the electroluminescent paint coating test plate are tested, whether the electroluminescent paint coating test plate can continue to normally emit light for a set time is tested. The resistance between the paint surface of the test plate and two electrodes is measured, and the insulation resistance of the test plate is tested. The test plate is lighted, whether the color temperature value of the test plate meets the development requirement is measured, and the light emitting color difference of the test plate is tested. The test plate is lighted by power supply at a set voltage under a set temperature and relative humidity, at a set time point, the light intensity value of the test plate is tested respectively, and the light decay rate is obtained. The test plate is continuously lighted for a set time, and the durability of the test plate is tested.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of performance test method of automobile exterior paint coating, and particularly relates to a performance verification method of automobile electroluminescent paint coating. BACKGROUND

[0002] At present, the performance verification of traditional automobile exterior paint coating includes basic adhesion, stone chip resistance, high-pressure cleaning, water resistance, moisture resistance, high-low temperature performance, low-temperature drop hammer impact, light aging resistance and the like. The test methods involved in these tests only verify the performance of the coating, and the electroluminescent paint coating not only verifies the paint coating, but also verifies the luminescent performance. The traditional test method cannot well meet the expected verification requirements, and therefore, necessary improvements need to be made on the basis of the traditional test method. In addition, the high-pressure cleaning, water resistance and moisture resistance test projects need to be subjected to destructive tests after the tests, and if only one test panel is used, it will greatly affect the test results, and therefore, control groups need to be set for these test projects. SUMMARY

[0003] In order to solve the technical problems existing in the prior art, the application provides a performance verification method of electroluminescent paint coating, which can not only meet the high-performance standard requirements of the automobile industry for exterior paint parts, but also is suitable for the luminescent performance verification of new-type luminescent paint.

[0004] In order to achieve the above-mentioned purpose, the application adopts the following technical scheme:

[0005] The application provides a performance verification method of electroluminescent paint coating, which comprises the following steps:

[0006] Manufacturing an electroluminescent paint coating test panel;

[0007] Testing the stone chip resistance, low-temperature drop hammer impact resistance, high-temperature storage resistance, low-temperature storage resistance and light aging resistance of the electroluminescent paint coating test panel, and after the testing is completed, testing whether the electroluminescent paint coating test panel can continue to normally emit light for a set time;

[0008] Measuring the resistance between the paint surface of the test panel and the two electrodes by using a multimeter, and then testing the insulation resistance of the test panel;

[0009] Lighting the test panel, measuring whether the color temperature value of the test panel meets the development requirements by using a color temperature instrument, and then testing the luminescent color difference of the test panel;

[0010] At the set temperature and relative humidity, the test plate is powered on and lighted at the set voltage, at the set time point, the light intensity of the test plate is tested respectively, and then the light decay rate is calculated;

[0011] At the set temperature, the test plate is continuously lighted for the set time, and then the durability of the test plate is tested.

[0012] As a further technical solution, the performance test method of the electroluminescent paint coating further comprises a water resistance test, and the water resistance test is further provided with a control group, the test plate of the control group is placed in a water tank in a semi-submerged manner, the electrode position is exposed to the water surface, and after being taken out after the set time, the test plate is dried and lighted for a certain time.

[0013] As a further technical solution, the performance test method of the electroluminescent paint coating further comprises a moisture resistance test, and the moisture resistance test is further provided with a control group, the test plate of the control group is sealed at two electrodes by sealing glue, and the wire harness connector is exposed outside, and after being taken out from the humid box after the set time, the test plate is dried and lighted for a certain time.

[0014] As a further technical solution, the performance test method of the electroluminescent paint coating further comprises a high-pressure cleaning resistance test, and the high-pressure cleaning resistance test is further provided with a control group, the test plate of the control group is not marked with a cross, and the test plate is normally lighted for a certain time after the test.

[0015] As a further technical solution, the performance test method of the electroluminescent paint coating, when the durability test is completed, the test plate film layer has no cracking, damage, bubbles, metamorphosis, peeling, softening, cracking, deformation, gloss change defects and normal function, and the brightness attenuation is within 40%, so that the test plate meets the durability requirement, otherwise it does not meet the requirement.

[0016] As a further technical solution, the performance test method of the electroluminescent paint coating further comprises an adhesion test.

[0017] The beneficial effects of the present application are as follows:

[0018] The present application is improved on the basis of the traditional paint coating test method, according to the characteristics of the electroluminescent paint coating, the luminous performance verification of the paint coating is increased; since the coating is embedded with electroluminescent coating, and the physicochemical performance requirements of the coating on the outer trim part are very high, therefore, the luminous paint coating performance test method provided by the present application firstly tests whether it meets the traditional paint coating performance, and then increases the test of the luminous performance on the basis of the qualified traditional paint coating performance verification, specifically, after the stone chip resistance, low-temperature falling hammer impact resistance, high-temperature storage resistance, low-temperature storage resistance and light aging resistance of the electroluminescent paint coating test plate are tested, it is still necessary to continue to test whether the electroluminescent paint coating test plate can continue to normally light for a set time; further, the resistance between the paint surface of the test plate and the two electrodes is measured by using a multimeter, and then the insulation resistance of the test plate is tested; further, the test plate is lighted, and whether the color temperature value of the test plate meets the development requirement is measured by using a color temperature instrument, and then whether the luminous color difference meets the development requirement is judged; further, the test plate is lighted by power supply at a set voltage under a set temperature and relative humidity, at a set time point, the light intensity value of the test plate is tested, and then the light decay rate is calculated; further, the test plate is continuously lighted for a set time under a set temperature, and then the durability of the test plate is tested.

[0019] 2. When the water resistance, moisture resistance and high-pressure washing resistance of the electroluminescent paint coating are tested, the control group is added, the traditional paint coating performance test part project needs to damage the paint surface to verify the adhesion or hardness at the beginning or during the test, the paint surface damage has a great influence on the luminous performance, in order to ensure the rationality, accuracy and traceability of the sample, the control group is set for the test. BRIEF DESCRIPTION OF DRAWINGS

[0020] The drawings accompanying the specification of this application form a part thereof, serve to provide further understanding of the application, and together with the description of the exemplary embodiments of the application, explain the application, and do not constitute an improper limitation on the application.

[0021] Figure 1 The performance test method of the electroluminescent paint coating provided by the present application. DETAILED DESCRIPTION

[0022] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the application. Unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as generally understood by those skilled in the art to which the present application belongs.

[0023] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, components, and / or groups thereof, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0024] Embodiment 1

[0025] The performance test method of the electroluminescent paint coating proposed in this embodiment is based on the traditional paint coating test method, and the verification of the luminescent performance is added. The whole test process is shown in Figure 1 As shown in the figure, the luminescent paint performance test can be divided into two types according to different test items, one is the performance index that needs to do the contrast test, and the other is the performance index that does not need to do the contrast test. Specifically, the stone chip resistance, low-temperature falling hammer impact resistance, high-temperature storage resistance, low-temperature storage resistance, light aging resistance test, insulation resistance test, luminescent color difference, light decay rate, durability and other performances of the electroluminescent paint coating test plate are not required to be tested. The contrast test, and the water resistance, moisture resistance, high-pressure cleaning resistance of the electroluminescent paint coating are required to be tested. The contrast test needs to prepare two test samples for synchronous test, and the two samples are tested in the same environment, but the specific test operation is different according to the characteristics of each item. After processing, one is used for coating performance verification, and the other is used for luminescent performance verification. After the two tests are qualified, it is proved that the whole test is qualified.

[0026] The performance test method of the electroluminescent paint coating proposed in this embodiment is based on the traditional paint coating test method, and the verification of the luminescent performance is added. The whole test process is shown in

[0027] An electroluminescent paint coating test plate is made.

[0028] The electroluminescent paint coating test plate is subjected to stone chip resistance, low-temperature falling hammer impact resistance, high-temperature storage resistance, low-temperature storage resistance, and light aging resistance test. After the stone chip resistance, low-temperature falling hammer impact resistance, high-temperature storage resistance, low-temperature storage resistance, or light aging resistance test of the electroluminescent paint coating test plate is completed, it is also necessary to test whether the electroluminescent paint coating test plate can continue to normally light for a set time.

[0029] Specifically, when the stone resistance of the electroluminescent paint coating test plate meets the requirements, it is checked whether the electroluminescent paint coating test plate can continue to be normally lit for a period of time, or whether the power-off protection is triggered. Different host manufacturers have different requirements for the level of stone resistance. If the stone resistance of the coating meets the requirements of the national standard, the test plate is lit, and if it can be normally lit for 5 minutes, the test performance is qualified. If it cannot be lit, it is checked whether the power-off protection switch is triggered. If it is triggered, the test is also qualified. If the power-off protection switch is not triggered, the test is unqualified.

[0030] When the low-temperature drop hammer impact resistance of the electroluminescent paint coating test plate meets the requirements (no paint peeling and no cracks), it is checked whether the electroluminescent paint coating test plate can continue to be normally lit for a period of time. If it can continue to be normally lit for a period of time, it means that the test plate is not damaged and the test is qualified. If it is not lit, the test is unqualified.

[0031] When the high-temperature storage resistance of the electroluminescent paint coating test plate meets the requirements (the paint surface is not allowed to blister, the paint surface has no obvious change; the adhesion is 0 / 1 level), it is checked whether the electroluminescent paint coating test plate can continue to be normally lit for a period of time. If it can continue to be normally lit for a period of time, it means that the test plate is not damaged and the performance test is qualified. If it cannot be lit, the performance test is unqualified.

[0032] When the low-temperature storage resistance of the electroluminescent paint coating test plate meets the requirements (the paint surface is not allowed to blister; there is no obvious color change; the adhesion is 0 / 1 level), it is checked whether the electroluminescent paint coating test plate can continue to be normally lit for a period of time. If it can continue to be normally lit for a period of time, the performance test is qualified. If it cannot, the performance test is unqualified.

[0033] When the light aging resistance of the electroluminescent paint coating test plate meets the requirements (for high light parts: no defects such as powdering, blistering, cracking, gloss loss ≤15%, ΔE ≤2, adhesion: 0 or 1 level), it is checked whether the electroluminescent paint coating test plate can continue to be normally lit for a period of time. If it can continue to be normally lit for a period of time and the brightness change is within ±20%, it means that the performance test is qualified. If it cannot, the performance test is unqualified.

[0034] Further, the resistance between the paint surface of the test plate and the two electrodes is measured using a multimeter, and the insulation resistance of the test plate is tested. The resistance between the main body (the light-emitting surface) and each wiring terminal is 3MΩ or more, indicating good insulation resistance. The resistance between the main body (the light-emitting surface) and each wiring terminal is 3MΩ or less, indicating poor insulation resistance.

[0035] Further, the test board is lit up, and whether the color temperature value of the test board meets the development requirements is measured by a color temperature instrument, and then the light emitting color difference is obtained; the color temperature value changes within the range of ±10% of the standard value, and the color difference produced will not produce a more obvious color difference to the human vision.

[0036] Further, the test board is powered on at a set voltage under a set temperature and relative humidity, and the light intensity value of the test board is tested at a set time point, and then the light decay rate of the test board is calculated; generally, the light decay rate is required to be ≤10%, which indicates that the test board meets the requirements, and the light decay rate >10% indicates that the test board does not meet the requirements.

[0037] Under a set temperature, the test board is continuously lit up for a set time, and then the durability of the test board is tested; specifically, after the test is completed, the test board film layer has no defects such as cracking, damage, bubbles, metamorphosis, peeling, softening, cracking, deformation, gloss change and the like and functions normally, and the brightness attenuation is within 30%;

[0038] Further, after the traditional paint performance detection is completed and qualified, the test of the light emitting performance is additionally performed, and after all the tests are qualified, the test is qualified.

[0039] In the embodiment, since the moisture resistance, water resistance and high-pressure cleaning test items are all test samples soaked or directly contacted with water molecules, the two electrode areas of the test sample cannot be waterproofed like the tooling sample, the two electrodes will be directly damaged by water, the test cannot be carried out, and the adhesion verification is required at the end of the water resistance and moisture resistance test, the test board is damaged, and the test board cannot be lit up subsequently, therefore, the test items are set with a control group, the control group repeats the related test operation in a half-soaking or half-closed manner, and the test is simultaneously carried out, so as to better verify the performance.

[0040] The light emitting performance verification method is to light up the test board for 5 minutes after the coating test is completed, and whether the light emitting state of the test board is normal is observed, and the judgment standard is that the light emission is stable, and the test board has no obvious change. The specific test method and evaluation standard are listed in detail in the following table, and it is emphasized that the test method of some test items does not need to be improved, and can be completely carried out according to the national standard or enterprise standard, therefore, the test method is not embodied in the following table, and is passed through a slash ( / ), and the evaluation standard is improved on the basis of the national standard.

[0041]

[0042]

[0043]

[0044]

[0045]

[0046] It is worth mentioning that in the above anti-stone test, since the anti-stone standard requires the level to be reached may exist paint film damage, the problem of destroying the light-emitting layer, therefore, in this test project, if the anti-stone is qualified, and the test board is verified because the trigger fails to light or cannot be lit for a long time, it is also determined to be qualified.

[0047] In the above light-emitting color difference performance test, the color temperature value is used as the evaluation standard for whether the light-emitting color difference exists. In the development and design, the specified color temperature value is used as the development requirement. In the actual test and mass production, the color temperature value within the range of 10% of the standard value is a qualified product. The color temperature value within the range of 10% fluctuates, and the human eye cannot well identify such changes.

[0048] In the above light decay rate test, the light intensity value is used as the measure of evaluating the light change. Within the specified test range, the light decay rate is less than 10% to be qualified. This is because the light intensity is calculated by the normal light-emitting paint, and the light intensity decreases by 10%. In the absence of contrast, the subjective feeling of the human eye cannot accurately identify the changes within this range.

[0049] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method for verifying the performance of an electroluminescent paint coating, characterized in that, as follows: Fabrication of electroluminescent paint coating test panels; The electroluminescent paint coating test board was subjected to tests for stone impact resistance, low temperature drop impact resistance, high temperature storage performance, low temperature storage performance, and light aging resistance. After the stone impact resistance, low temperature drop impact resistance, high temperature storage performance, low temperature storage performance, and light aging resistance tests were completed, it was also necessary to test whether the electroluminescent paint coating test board could continue to light up normally for the set time. It also includes a water resistance test, and the water resistance test also has a control group. The control group test plate is placed in a water tank in a semi-immersed manner, with the electrode positions exposed on the water surface. After a set time, it is taken out, wiped dry, and then lit for a certain period of time. It also includes a moisture resistance test, and the moisture resistance test also has a control group. The two electrodes of the test plate of the control group are sealed with sealant, and the wire harness connector is exposed. After the set time, it is taken out of the moisture chamber, wiped dry and lit for a certain period of time. It also includes a high-pressure cleaning resistance test, and the high-pressure cleaning resistance test also has a control group. The test plate of the control group is not marked with an "X", and it is lit normally for a certain period of time after the test. The resistance between the paint surface of the test board and the two electrodes is measured to test the insulation resistance of the test board. Light up the test board and measure its color temperature to see if it meets the development requirements, and then test the luminous color difference of the test board. Under the set temperature and relative humidity, the test board is powered on and lit up with the set voltage. At the set time points, the light intensity value of the test board is measured, and then the light decay rate is calculated. At a set temperature, the test board is continuously lit for a set time to test its durability.

2. The performance testing method for electroluminescent paint coatings as described in claim 1, characterized in that, During durability testing, if the test panel film layer has no defects such as cracking, damage, bubbles, deterioration, peeling, softening, crazing, deformation, or gloss change after the test, and its function is normal, and the brightness decay is within 30%, then the test panel meets the durability requirements; otherwise, it does not.

3. The performance testing method for electroluminescent paint coatings as described in claim 1, characterized in that, When conducting stone impact resistance tests, if the stone impact resistance is ≤2 and the test board can still be lit normally for more than the set time after the test, the test board is qualified; if the stone impact resistance is ≤2 but the test board triggers the power-off protection, it indicates that the paint surface is damaged and the test board is qualified.

4. The performance testing method for electroluminescent paint coatings as described in claim 1, characterized in that, When conducting a low-temperature drop hammer impact test, if the paint does not peel or crack, and the test panel can still be lit normally for more than the set time after the test, then the test panel is considered qualified; otherwise, it is unqualified.

5. The performance testing method for electroluminescent paint coatings as described in claim 1, characterized in that, During the high-temperature storage test, the storage time is set; if the paint surface performance is qualified, the luminescence performance test is continued: after taking it out of the high-temperature chamber, connect the power supply and light up the test board for more than the set time. If the following conditions are met simultaneously: no bubbling on the paint surface, no obvious changes on the paint surface, adhesion remains at level 0 / 1, and the paint can still be lit normally for more than the set time after the test, then the test panel is considered qualified; otherwise, it is unqualified.

6. The performance testing method for electroluminescent paint coatings as described in claim 1, characterized in that, When conducting low-temperature storage tests, the storage time is set. If the paint surface performance is qualified, the luminescence performance test is continued: after taking it out of the low-temperature chamber, connect the power supply and light up the test panel for more than the set time. If the following conditions are met at the same time: no blistering on the paint surface; no obvious color change on the paint surface; adhesion remains at level 0 / 1; and it can still be lit normally for more than the set time after the test, then the test panel is qualified; otherwise, it is unqualified.

Images