Testing device and testing method for evaluating water-blocking performance of water-blocking glue

Abstract

The invention discloses a testing device for evaluating the water-blocking performance of water-blocking glue, and the device is characterized in that the device comprises a transparent cavity; cobalt chloride test paper is arranged in the transparent cavity; a cavity between the upper opening of the transparent cavity and the cobalt chloride test paper is filled with a fiber material; and the upper opening of the transparent cavity is sealed by a silica gel adhesive to be tested to form a sealing layer with the thickness of about 0.5-1cm. The invention further discloses a testing method of the device. According to the invention, the sample preparation of the to-be-tested silica gel adhesive is not limited, and the silica gel adhesive does not need to be prepared into a sheet-shaped sample meeting specific requirements. The water-blocking performance of the silica gel adhesive can still be accurately evaluated aiming at the silica gel adhesive which is difficult to prepare, is pasty, is in an irregular form and is inconvenient to prepare in the prior art, and the application range is wider.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of water blocking performance related test of silicone adhesive, and particularly relates to a test device and test method for evaluating water blocking performance of water blocking adhesive. BACKGROUND

[0002] Silicone adhesive is widely used in waterproof sealing in the fields of photovoltaic, electronics, automobile, building, etc. due to its good sealing property, weather resistance and electrical property. In recent years, with the rapid development of photovoltaic industry, the related assembly and potting adhesive and sealant are constantly innovated, so that the adhesion and sealing performance is more optimal, more stable and longer in service life. Compared with other types of sealant, silicone adhesive has outstanding durability under harsh conditions, excellent ultraviolet light resistance and atmospheric aging resistance, can maintain no cracking, no embrittlement and no deterioration for more than 30 years in harsh environments such as sunlight, rain, snow and seasonal climate change, and has a ± 50% anti-deformation displacement capacity in a wide temperature range. However, in addition to excellent mechanical properties, adhesion properties and weather resistance, silicone adhesive for assembling photovoltaic modules must also have high water blocking performance.

[0003] At present, the water blocking performance of silicone is mainly evaluated by water vapor transmission rate test method. This method usually requires the silicone to be made into a sheet-shaped sample with a specific shape and thickness, and the sample preparation process is complex, and the applicability is poor for some silicone adhesives that are not easy to form. In addition, the traditional test equipment has high cost and complex operation, which is not conducive to quickly and simply evaluating the water blocking performance of silicone. SUMMARY

[0004] In order to overcome the above-mentioned defects of the prior art, the purpose of the present application is to provide a test device and test method for evaluating the water blocking performance of water blocking adhesive.

[0005] The present application can efficiently complete the water blocking performance evaluation through simple materials and operations, fill the technical gap of water blocking test of silicone adhesive which is not convenient to sample, and reduce the test cost and operation threshold.

[0006] A test device for evaluating the water blocking performance of water blocking adhesive, comprising: a transparent cavity; A cobalt chloride test paper is arranged in the transparent cavity. The cavity between the upper opening of the transparent cavity and the cobalt chloride test paper is filled with a fibrous material. The upper opening of the transparent cavity is sealed by the silicone adhesive to be tested, forming a sealing layer with a thickness of about 0.5-1cm.

[0007] In a preferred embodiment of the present application, the transparent cavity is a transparent test tube.

[0008] In a preferred embodiment of the present application, the transparent test tube is a transparent glass test tube.

[0009] In a preferred embodiment of the present application, the glass test tube has a length of not less than 10 cm and a diameter of not less than 1 cm.

[0010] In a preferred embodiment of the present application, the fibrous material is cotton.

[0011] In a preferred embodiment of the present application, the entire test device is placed in a temperature and humidity test chamber, which provides a constant temperature condition and a humidity condition of 5% RH-100% RH for the test device.

[0012] In a preferred embodiment of the present application, the temperature range of the constant temperature condition is 23℃-100℃.

[0013] In a preferred embodiment of the present application, the silicone adhesive to be tested is replaced by an elastic sealant material to be tested.

[0014] A test method for evaluating the water-blocking performance of a water-blocking adhesive, comprising the following steps: Placing a cobalt chloride test paper in the transparent cavity in the test device, and filling the upper part with fibrous material; Sealing the upper opening of the transparent cavity in the test device with the silicone adhesive to be tested; Placing the test device with the completed sealing in a temperature and humidity test chamber; Setting the temperature and humidity data of the corresponding simulation test scene in the humidity condition range and the temperature range according to the simulation test scene requirements of the silicone adhesive to be tested; Observing and recording the color change of the cobalt chloride test paper, and evaluating the water-blocking performance of the silicone adhesive according to whether the color of the cobalt chloride test paper changes and the length of the color change time.

[0015] In a preferred embodiment of the present application, the cobalt chloride test paper is blue in a dry state and turns white to pink after absorbing moisture, and the length of the color change time of the cobalt chloride test paper is related to the moisture absorption performance. Under the same temperature and humidity conditions, when the color change time of the cobalt chloride test paper is long, it indicates that the moisture absorption performance of the silicone adhesive to be tested is better than that of the silicone adhesive to be tested with a short color change time of the cobalt chloride test paper.

[0016] The present application has the following advantages: The present application has no restrictions on the sample preparation of the silicone adhesive to be tested: there is no need to prepare the silicone adhesive into a specific required sheet sample.

[0017] The present application can precisely evaluate the water blocking performance of the silicone adhesive, and has a wider application range.

[0018] Compared with the prior art, the present application has obvious cost and operation advantages: The materials required for testing are only silicone adhesive, cobalt chloride test paper, ordinary glass tube and cotton, which are common and low-cost; the operation process does not require complex instruments and professional skills, and ordinary people can complete the test after simple guidance.

[0019] Compared with the prior art, the present application has strong test environment adaptability: The present application can simulate various environmental conditions from low humidity (5% RH) to high humidity (100% RH) by means of a temperature and humidity test chamber, and can test the water blocking performance of the silicone adhesive under different use scenarios, so that the test results have more practical reference value.

[0020] And under the same conditions, multiple samples can be tested at the same time, which is more intuitive and saves test cost. DETAILED DESCRIPTION

[0021] Figure 1 The present application is a test device structure diagram.

[0022] Figure 2 The present application is a test device assembly diagram.

[0023] Figure 3 The present application is a color comparison diagram of cobalt chloride test paper in dry and hygroscopic states. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the present application more clear and explicit, the present application will be further described in detail below by means of drawings and examples. However, it should be understood that the specific examples described herein are only used to explain the present application, and are not used to limit the scope of the present application. In addition, in the following structure, the description of known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present application.

[0025] In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom end" and the like indicate the orientation or positional relationship shown in the drawings, and are only used for the convenience of describing the present application and simplifying the description. Therefore, it cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0026] The application realizes water resistance performance evaluation based on the core principle of "moisture penetration-color indication", and the specific logic is as follows: As shown in Figure 1 The dry blue cobalt chloride test paper 200 is placed at the bottom of the glass test tube 100, the top of the test paper is filled with appropriate cotton 300, the cotton 300 is used to control the thickness of the adhesive layer of the silicone adhesive 400 to be tested, a sealing layer of the silicone adhesive 400 to be tested with a thickness of about 0.5-1cm is formed, and the barrier to water vapor penetration is formed.

[0027] The assembled test device is placed into a commercial temperature and humidity test chamber, and the target temperature and humidity (5% RH-100% RH adjustable) are set according to the test requirements.

[0028] If the water resistance performance of the silicone adhesive 400 to be tested is poor, the water vapor in the test chamber will penetrate the sealing layer of the silicone adhesive 400 to be tested and penetrate to the cobalt chloride test paper 200, so that the cobalt chloride test paper 200 changes from blue to white to pink; if the water resistance performance of the silicone adhesive 400 to be tested is good, the cobalt chloride test paper 200 remains blue. By observing the color change and change time of the test paper, the water resistance of the silicone adhesive can be judged.

[0029] The application will be further described in combination with specific embodiments as follows: Example 1

[0030] A glass test tube with a length of 10cm and a diameter of 1cm is taken, a piece of dry blue cobalt chloride test paper is placed at the bottom of the glass test tube, appropriate cotton is filled on the upper end of the cobalt chloride test paper, and the top of the cotton is filled with the water resistance silicone adhesive sample to be tested in Example 1, to form a sealing layer with a thickness of about 0.5-1cm.

[0031] The test tube is placed in a temperature and humidity test chamber, and the temperature is set to 85℃ and the humidity is set to 85% RH. The color change of the test paper is observed at intervals.

[0032] The time from blue to white to pink (40 days) is recorded, and the longer the time, the better the water resistance of the silicone. Example 2

[0033] The temperature and humidity conditions are changed, and the temperature is set to 100℃ and the humidity is set to 100% RH, and the above operation steps are repeated.

[0034] The water resistance performance difference of the water resistance silicone adhesive sample to be tested in Example 1 under different temperature and humidity conditions is compared.

[0035] In Example 2, the specific change time of the test paper from blue to white to pink is 30 days after changing the temperature and humidity conditions. Example 3

[0036] The test was performed using a non-barrier ordinary silica gel adhesive, and the temperature was set to 85℃ and the humidity was set to 85% RH, and the above steps were repeated.

[0037] Comparative Example 1 was used to compare the water resistance of a non-barrier ordinary silica gel adhesive under the same temperature and humidity conditions.

[0038] In Example 3, the silica gel adhesive sample was changed, and the test paper changed from blue to white to pink in 10 days. Example 4

[0039] The test was performed using a non-barrier ordinary silica gel adhesive, and the temperature was set to 100℃ and the humidity was set to 100% RH, and the above steps were repeated.

[0040] Comparative Example 2 was used to compare the water resistance of a non-barrier ordinary silica gel adhesive under the same temperature and humidity conditions.

[0041] In Example 4, the silica gel adhesive sample was changed, and the test paper changed from blue to white to pink in 5 days.

[0042] The present application is not only suitable for silica gel adhesives, but also for other elastic sealing materials for preliminary evaluation of water resistance.

[0043] The above shows and describes the basic principles and main features of the application and the advantages of the application.

[0044] Those skilled in the art should understand that the present application is not limited to the above examples, and the above examples and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A test device for evaluating the water blocking performance of a water blocking gel, characterized by, The application relates to a test device for testing the water resistance of a silicone adhesive. The application comprises: a transparent cavity; a cobalt chloride test paper is arranged in the transparent cavity; a cavity between the upper opening of the transparent cavity and the cobalt chloride test paper is filled with a fibrous material; 2. A test device for evaluating the water barrier properties of a water barrier glue according to claim 1, characterized in that the upper opening of the transparent cavity is sealed by the silicone adhesive to be tested, forming a sealing layer with a thickness of about 0.5-1 cm.

3. A test device for evaluating the water barrier properties of a water barrier glue as claimed in claim 1, characterized in that, The transparent cavity is a transparent test tube.

4. The test device for evaluating the water blocking performance of a water blocking gel according to claim 1, wherein The transparent test tube is a transparent glass test tube.

5. The test device for evaluating the water-blocking performance of water-blocking glue according to claim 1, characterized in that, The length of the glass test tube is not less than 10 cm, and the diameter is not less than 1 cm.

6. A test device for evaluating the water barrier properties of a water barrier glue as claimed in claim 1, characterized in that, The fibrous material is cotton.

7. A test device for evaluating the water barrier properties of a water barrier glue as claimed in claim 1, characterized in that, The whole test device is placed in a temperature and humidity test chamber, which provides a constant temperature condition and a humidity condition of 5%RH-100%RH for the test device.

8. A test device for evaluating the water barrier properties of a water barrier glue as claimed in claim 1, characterized in that, The temperature range of the constant temperature condition is 23-100 DEG C.

9. A test method for evaluating the water barrier properties of a water barrier glue according to any one of claims 1-8, characterized in that, The silicone adhesive to be tested is replaced by an elastic sealant to be tested. The application comprises the following steps: placing the cobalt chloride test paper in the transparent cavity in the test device and filling the upper part with the fibrous material; sealing the upper opening of the transparent cavity in the test device by the silicone adhesive to be tested; placing the sealed test device in a temperature and humidity test chamber; setting the temperature and humidity data of the corresponding simulation test scene according to the simulation test scene of the silicone adhesive to be tested; 10. A test method for evaluating the water barrier properties of a water barrier glue as claimed in claim 9, characterized in that, observing and recording the color change of the cobalt chloride test paper, and evaluating the water resistance of the silicone adhesive according to the color change of the cobalt chloride test paper and the color change time. The cobalt chloride test paper is blue in a dry state and turns white to pink after absorbing moisture, the color change time of the cobalt chloride test paper is related to the moisture absorption performance, and under the same temperature and humidity conditions, when the color change time of the cobalt chloride test paper is long, it indicates that the moisture absorption performance of the silicone adhesive to be tested is relatively good compared with the silicone adhesive to be tested with a short color change time of the cobalt chloride test paper.

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