Coating sample anti-condensation performance simulation test device and anti-condensation performance evaluation method

Abstract

The invention relates to a coating sample anti-condensation performance simulation test device and an anti-condensation performance evaluation method. The simulation test device comprises an indoor environment simulation box and an inner wall temperature simulation device which is arranged in the indoor environment simulation box and is used for controlling the temperature of a sample to be tested. The evaluation method comprises the following steps: calculating the critical dew formation temperature of a sample to be tested and the temperature control temperature of the sample when the critical dew formation temperature is obtained, and calculating the difference between the critical dew formation temperature and the temperature control temperature so as to simulate the temperature difference between the critical dew formation temperature and the temperature control temperature in a test environment to evaluate the anti-dew formation performance of the sample to be tested. Compared with the prior art, the method has the advantage that the anti-condensation performance of the coating sample can be accurately evaluated.

Description

Technical Field

[0001] The present invention belongs to the technical field of coating detection equipment and methods, and specifically relates to a coating sample anti-condensation performance simulation test device and an anti-condensation performance evaluation method. Background Art

[0002] In order to prevent condensation on the interior walls of buildings, anti-condensation functional coatings have emerged. However, there is currently no unified national standard for the anti-condensation performance testing of coatings in my country. The only existing standards are my country's HG-T 4560-2013 industry standard, the US TT-C-492C standard and Japan's JISA6909 standard, which also have many problems, such as: my country's HG-T The 4560-2013 industry standard measures the dew point and condensation rate, and the US TT-C-492C standard measures the dew point and condensation amount. Since the anti-condensation performance is evaluated by the dew point (the time when the first drop of water falls on the paint sample), and the actual situation is that it takes a long time for the paint sample surface to become wet and for water droplets to fall, this results in: the time when the first drop of water falls on the paint sample cannot accurately reflect the anti-condensation performance of the paint sample, and the Japanese JISA6909 standard evaluates the anti-condensation performance of the paint based on the moisture absorption within 6 hours. It directly tests the water absorption of the paint and cannot refer to the anti-condensation performance. Therefore, the current standards often show that the anti-condensation performance is good in the measurement results, but the expected anti-condensation performance cannot be achieved in actual applications.

[0003] Therefore, developing a simulation test device for the anti-condensation performance of coating samples and an anti-condensation performance evaluation method is crucial to improving the accuracy of the evaluation of the anti-condensation performance of coating samples. Summary of the invention

[0004] The purpose of the present invention is to overcome the defects in the prior art and provide a coating sample anti-condensation performance simulation test device and an anti-condensation performance evaluation method. The present invention can accurately evaluate the anti-condensation performance of coating samples.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0006] A coating sample anti-condensation performance simulation test device comprises an indoor environment simulation box and an inner wall temperature simulation device which is arranged in the indoor environment simulation box and is used to control the temperature of the sample to be tested.

[0007] As a further technical solution, the indoor environment simulation box adopts a constant temperature and humidity test box, and the constant temperature and humidity test box is provided with a sealed door and a transparent observation window for opening or closing the constant temperature and humidity test box.

[0008] As a further technical solution, the interior wall temperature simulation device includes a sample temperature control platform, a thermal conductive template arranged on the sample temperature control platform and used to coat the sample to be tested, and a sample monitoring temperature sensor arranged on the thermal conductive template and buried in the sample to be tested.

[0009] As a further technical solution, a water-discoloring test paper is provided on the surface of the sample to be tested. The water-discoloring test paper adopts a moisture detection test paper, and the color of the water-discoloring test paper changes from yellow to blue when it contacts a slightly damp surface.

[0010] As a further technical solution, the sample temperature control stage includes a semiconductor refrigeration stage, a temperature control temperature sensor arranged in the semiconductor refrigeration stage and close to one side of the thermally conductive sample plate;

[0011] As a further technical solution, the heat-conducting sample plate is a heat-conducting metal plate, preferably a heat-conducting aluminum plate.

[0012] As a further technical solution, a heat-conducting adhesive layer is provided between the cold end of the semiconductor refrigeration table and the heat-conducting sample plate.

[0013] As a further technical solution, the thermally conductive adhesive layer is a thermally conductive silicone grease layer.

[0014] As a further technical solution, it also includes a computer and a temperature and humidity controller, and the temperature and humidity controller is communicatively connected with the indoor environment simulation box and the sample temperature control station respectively.

[0015] A method for evaluating the anti-condensation performance of a coating, using the coating sample anti-condensation performance simulation test device to measure the critical condensation temperature of the sample to be tested and the sample temperature control temperature when the critical condensation temperature is obtained, and calculating the difference between the critical condensation temperature of the sample to be tested and the sample temperature control temperature when the critical condensation temperature is obtained as the insulation temperature difference ΔT of the sample to be tested, insulation temperature difference ΔT=T 结露 -T 温控 ; Then, the anti-condensation performance of the sample to be tested is evaluated by taking the insulation temperature difference ΔT of the sample to be tested under the simulated test environment as an indicator;

[0016] The evaluation method is: under the simulated test environment, the insulation temperature difference ΔT of the sample to be tested is greater than or equal to the specified threshold value T 阈值 , the anti-condensation performance of the tested sample is qualified; under the same simulated test environment, the larger the insulation temperature difference ΔT of different tested samples, the better the anti-condensation performance of the tested sample.

[0017] As a further technical solution, a method for determining the threshold is provided: under the construction environment, the difference between the ambient dew point temperature and the inner wall surface temperature when no coating is applied is taken as the threshold value T 阈值 ; T 阈值 =T 环露 -T 环表面; T-ring dew: ambient dew point temperature under construction environment; T-ring surface: the surface temperature of the inner wall when no paint is applied in the actual construction environment.

[0018] As a further technical solution, a method for measuring the critical condensation temperature of a sample to be tested and obtaining the sample temperature control temperature at the critical condensation temperature by using the coating sample anti-condensation performance simulation test device includes:

[0019] Step 1: The coating to be tested is applied to a thermal conductive sample plate, and after curing, a sample to be tested is obtained;

[0020] Step 2: Set the temperature and humidity of the indoor environment simulation box through the temperature and humidity controller;

[0021] Step 3. Under the simulated test environment, use the sample temperature control station to control the temperature of the sample to be tested, use the sample temperature control sensor to monitor the temperature control temperature of the sample temperature control station, use the sample temperature monitoring sensor to monitor the actual temperature of the sample to be tested, set the sample temperature control station to the ambient temperature initially, and then gradually reduce the temperature in a gradient of 0.1°C. After each temperature is kept warm for a specified time (usually 1h), find the actual temperature of the sample to be tested when the surface of the sample to be tested becomes wet for the first time (i.e. the test paper changes color), which is the critical condensation temperature of the sample to be tested under the simulated environment. At the same time, read the sample temperature control temperature (the display temperature of the temperature control sensor) when the critical condensation temperature is obtained.

[0022] As a further technical solution, when observing whether the sample surface is damp, a moisture detection test paper is placed on the sample surface. When the moisture detection test paper changes color, it is considered that the sample surface is damp.

[0023] As a further technical solution, the sample to be tested is prepared by applying the coating to be tested on a thermal conductive sample plate and leaving it to dry naturally for 72 hours.

[0024] As a further technical solution, the coating sample anti-condensation performance simulation test device is used to determine the critical condensation temperature of the sample to be tested and / or the insulation temperature difference ΔT of the sample to be tested, and the steps include:

[0025] Step 1, prepare the sample to be tested: apply the coating to be tested on the thermal conductive sample plate, place it for 72 hours to dry naturally, and then obtain the sample to be tested;

[0026] Step 2, equipment installation: The sample to be tested is bonded to the sample temperature control table through a thermal conductive adhesive layer, and placed in an indoor environment simulation box. Then, the temperature and humidity controller are connected to the computer, the sample temperature control table and the indoor environment simulation box through data cables, and the temperature and humidity of the indoor environment simulation box are controlled by the temperature and humidity controller, and the temperature control temperature of the sample temperature control table is controlled by the temperature and humidity controller;

[0027] Step 3, equipment parameter setting and determination of the critical condensation temperature of the sample to be tested and the sample temperature control temperature when the critical condensation temperature is obtained: set the temperature and humidity of the indoor environment simulation box and the temperature control temperature of the sample temperature control station through the temperature and humidity controller; monitor the actual temperature of the sample to be tested through the sample detection sensor; set the sample temperature control station to the ambient temperature initially, and then gradually reduce the temperature by 0.1°C, keep each temperature for a specified time (usually 1h), find the actual temperature of the sample to be tested when the surface of the sample to be tested becomes wet for the first time (i.e. the test paper changes color), which is the critical condensation temperature of the sample to be tested under the simulated environment, and read the sample temperature control temperature (the display temperature of the temperature control temperature sensor) when the critical condensation temperature is obtained;

[0028] Step 4: Calculate the insulation temperature difference ΔT of the sample to be tested: Calculate the critical dew condensation temperature of the sample to be tested and the difference between the sample temperature control temperature when the critical dew condensation temperature is obtained, and use it as the insulation temperature difference ΔT of the sample to be tested. The insulation temperature difference ΔT = T 结露 -T 温控 ; Then step 5, evaluation: using the insulation temperature difference ΔT of the sample to be tested under the simulated test environment as an indicator to evaluate the anti-condensation performance of the sample to be tested;

[0029] The evaluation method is: under the simulated test environment, the insulation temperature difference ΔT of the sample to be tested is greater than the specified threshold value T 阈值 , the anti-condensation performance of the tested sample is qualified; under the same simulated test environment, the greater the insulation temperature difference ΔT of different tested samples, the better the anti-condensation performance of the tested sample;

[0030] The method for determining the specified threshold is: the difference between the ambient dew point temperature and the inner wall surface temperature when no coating is applied under the construction environment is taken as the threshold value T 阈值 ; T 阈值 =T 环露 -T 环表面 ; T 环露 : Ambient dew point temperature in the construction environment; T 环表面 : The surface temperature of the interior wall before coating in the actual construction environment.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] 1. In order to solve the problem that the test results of the anti-condensation performance of the coating in the prior art cannot accurately reflect the actual anti-condensation performance of the coating, the present invention proposes to evaluate the anti-condensation performance of the coating sample by the difference between the critical condensation temperature of the sample to be tested and the sample temperature control temperature when the critical condensation temperature is obtained. Since the anti-condensation mechanism of the anti-condensation coating is not only related to the thermal properties and surface properties of the coating itself, but also affected by multiple factors such as the external environment and the coating process, the critical condensation temperature calculated by the enthalpy-humidity diagram cannot be directly used as the critical condensation temperature of the coating sample. Therefore, the present invention sets an environmental simulation box and an inner wall simulation device. In the environmental simulation box, the temperature of the coating sample is controlled by the sample temperature control station of the inner wall simulation device, and the critical condensation temperature of the sample to be tested and the sample temperature control temperature when the critical condensation temperature is obtained are measured, thereby laying a foundation for the realization of the new evaluation method.

[0033] 2. The present invention breaks the limitations of existing anti-condensation evaluation methods, and proposes to evaluate the anti-condensation performance of coating samples by the difference between the critical condensation temperature of the coating samples and the setting temperature of the sample temperature control station when the critical condensation temperature is obtained, and evaluates the pros and cons of the anti-condensation performance of coating samples under a simulated environment. Compared with the evaluation method in the prior art, the present invention can more accurately reflect the anti-condensation performance of coating samples in actual engineering.

[0034] 3. Compared with the traditional water circulation method to control the temperature of the paint sample, the present invention uses a semiconductor refrigeration plate to control the temperature of the paint sample, which has higher temperature control accuracy, thereby improving the accuracy of sample temperature control and the accuracy of critical condensation temperature determination. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the structure of one embodiment of the present invention (computer and temperature controller are not shown);

[0036] Figure 2 A schematic diagram of the structure of an embodiment of the present invention from another angle (without the sealing door)

[0037] Figure 3 The schematic diagram of the structure of the sample temperature control station in one embodiment of the present invention (with the sample to be tested);

[0038] Figure 4 This is the state diagram of the coating sample in actual working condition verification when there is no condensation;

[0039] Figure 5 This is the state diagram of the coating sample when condensation occurs in the actual working condition verification;

[0040] Figure 6 This is a psychrometric diagram used in one embodiment of the present invention.

[0041] exist Figure 1-3 In: 1. Indoor environment simulation box, 2. Sample temperature control table, 3. Inner wall temperature simulation device, 4. Semiconductor refrigeration table, 5. Temperature control temperature sensor, 6. Thermal conductivity sample, 7. Sample to be tested, 8. Sample monitoring temperature sensor, 9. Sealed door, 10. Transparent observation window, 11. Thermal conductive adhesive layer, 12. Temperature and humidity controller, 13. Computer, 14. Water-changing test paper. DETAILED DESCRIPTION

[0042] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0044] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] The present invention is described in further detail below with reference to the accompanying drawings.

[0046] Example 1

[0047] In order to provide accurate anti-condensation performance evaluation results, our company proposes to use the difference between the critical dew temperature and the sample temperature control temperature when the critical dew temperature is obtained (i.e., the insulation temperature difference ΔT) to indicate the anti-condensation performance of the coating sample. However, the anti-condensation mechanism of the anti-condensation coating is not only related to the thermal properties and surface properties of the coating itself, but also affected by multiple factors such as the external environment and coating process. Therefore, the critical dew temperature calculated by the enthalpy-humidity diagram cannot be directly used as the critical dew temperature of the coating sample. Therefore, how to measure the critical dew temperature of the coating sample under a simulated environment and the sample temperature control temperature when the critical dew temperature is obtained becomes the first problem that needs to be solved when evaluating the anti-condensation performance of the coating sample.

[0048] to this end, Figure 1-3 An embodiment of a coating sample anti-condensation performance simulation test device of the present invention is shown, comprising an indoor environment simulation box 1, and an inner wall temperature simulation device 3 arranged in the indoor environment simulation box 1 and used to control the temperature of a sample 7 to be tested.

[0049] As an embodiment of a coating sample anti-condensation performance simulation test device of the present invention, the indoor environment simulation box 1 adopts a constant temperature and humidity test box, and the constant temperature and humidity test box 1 is provided with a sealed door 9 and a transparent observation window 10 for opening or closing the constant temperature and humidity test box 1.

[0050] As an embodiment of a coating sample anti-condensation performance simulation test device of the present invention, the constant temperature and humidity test chamber 1 is of model LHS-150HC-11, purchased from Shanghai Yiheng Scientific Instrument Co., Ltd.; since the purpose of the constant temperature and humidity test chamber is only to ensure constant temperature and humidity in the chamber, it belongs to the prior art and is a commercially available part, and the specific structure is not repeated here.

[0051] As an embodiment of a coating sample anti-condensation performance simulation test device of the present invention, the interior wall temperature simulation device 3 includes a sample temperature control platform 2, a thermal conductive template 6 arranged on the sample temperature control platform 2 and used to coat the sample to be tested 7, and a sample monitoring temperature sensor 8 arranged on the thermal conductive template 6 and buried in the sample to be tested.

[0052] As an embodiment of a coating sample anti-condensation performance simulation test device of the present invention, the sample temperature control platform 2 includes a semiconductor refrigeration platform 4 and a temperature control temperature sensor 5 embedded in the semiconductor refrigeration platform 4 and close to one side of the thermal conductive sample plate 6.

[0053] As an embodiment of a device for simulating and testing the anti-condensation performance of a coating sample of the present invention, the thermally conductive sample plate 6 is a thermally conductive metal plate, preferably a thermally conductive aluminum plate.

[0054] As an embodiment of a device for simulating a test of the anti-condensation performance of a coating sample according to the present invention, a thermally conductive adhesive layer 11 is provided between the cold end of the semiconductor refrigeration stage 4 and the thermally conductive sample plate 6 .

[0055] As an embodiment of a device for simulating and testing the anti-condensation performance of a coating sample of the present invention, the thermally conductive adhesive layer 11 is a thermally conductive silicone grease layer.

[0056] As an embodiment of a coating sample anti-condensation performance simulation test device of the present invention, a water-discoloring test paper 14 is also provided on the sample to be tested, and the water-discoloring test paper 14 adopts a moisture detection test paper. When observing whether the sample surface is damp, the water-discoloring test paper 14 is placed on the sample surface. When the water-discoloring test paper 14 contacts a slightly damp surface, it changes from yellow to blue. Therefore, when the water-discoloring test paper 14 changes color, it is considered that the sample surface is damp. The present invention uses the water-discoloring test paper 14 to detect whether the sample surface is damp, which has a higher degree of recognition than directly observing the damp phenomenon with the naked eye.

[0057] As an embodiment of a coating sample anti-condensation performance simulation test device of the present invention, it also includes a computer and a temperature and humidity controller, which are respectively communicated with the indoor environment simulation box and the sample temperature control station. The temperature and humidity controller is used to control the temperature and humidity of the indoor environment simulation box, and is used to control the temperature control temperature of the sample temperature control station, that is, the set temperature of the sample temperature control station.

[0058] Example 2

[0059] A method for measuring the critical condensation temperature of a coating sample and obtaining the sample temperature control temperature at the critical condensation temperature by using the anti-condensation performance simulation test device described in Example 1 comprises the following steps:

[0060] Step 1, prepare the sample to be tested: apply the coating to be tested on the thermal conductive sample plate, place it for 72 hours to dry naturally, and then obtain the sample to be tested;

[0061] Step 2, equipment installation: The sample to be tested is bonded to the sample temperature control table through a thermal conductive adhesive layer, and placed in an indoor environment simulation box. Then, the temperature and humidity controller are connected to the computer, the sample temperature control table and the indoor environment simulation box through data cables, and the temperature and humidity of the indoor environment simulation box are controlled by the temperature and humidity controller, and the temperature control temperature of the sample temperature control table is controlled by the temperature and humidity controller;

[0062] Step 3, equipment parameter setting and determination of the critical condensation temperature of the sample to be tested and the sample temperature control temperature when the critical condensation temperature is obtained: set the temperature and humidity of the indoor environment simulation box and the temperature control temperature of the sample temperature control station through the temperature and humidity controller; monitor the actual temperature of the sample to be tested through the sample detection sensor; set the sample temperature control station to the ambient temperature initially, and then gradually reduce the temperature by 0.1°C, keep each temperature for a specified time (usually 1h), find the actual temperature of the sample to be tested when the surface of the sample to be tested becomes wet for the first time (i.e. the test paper changes color), which is the critical condensation temperature of the sample to be tested under the simulated environment, and read the sample temperature control temperature (the display temperature of the temperature control temperature sensor) when the critical condensation temperature is obtained;

[0063] Example 3

[0064] A method for evaluating the anti-condensation performance of a coating comprises: evaluating the anti-condensation performance of the coating based on the difference between the critical condensation temperature of a sample to be tested and the sample temperature control temperature when the critical condensation temperature is obtained, specifically:

[0065] Step 1: Calculate the insulation temperature difference ΔT of the sample to be tested: Calculate the critical dew condensation temperature of the sample to be tested and the difference between the sample temperature control temperature when the critical dew condensation temperature is obtained, as the insulation temperature difference ΔT of the sample to be tested, insulation temperature difference ΔT = T 结露 -T 温控 ; Among them, T 温控 : The temperature control temperature of the sample temperature control station when the critical condensation temperature of the sample to be tested is obtained;

[0066] T Condensation : Critical condensation temperature of the sample to be tested.

[0067] Step 2, evaluation: using the insulation temperature difference ΔT of the sample to be tested under the simulated test environment as an indicator to evaluate the anti-condensation performance of the sample to be tested;

[0068] The evaluation method is: under the simulated test environment, the insulation temperature difference ΔT of the sample to be tested is greater than or equal to the specified threshold value T 阈值 , the anti-condensation performance of the tested sample is qualified; under the same simulated test environment, the larger the insulation temperature difference ΔT of different tested samples, the better the anti-condensation performance of the tested sample.

[0069] Among them, the threshold value T 阈值 The value of T is related to the construction environment. 阈值 It will also be different;

[0070] Method for determining the specified threshold value: Under the construction environment, the difference between the ambient dew point temperature and the interior wall surface temperature when no coating is applied is taken as the threshold value T 阈值 ; T 阈值 =T 环露 -T 环表面; T-ring dew: ambient dew point temperature under construction environment, obtained from enthalpy-humidity diagram; T-ring surface: the surface temperature of the inner wall when no paint is applied in the actual construction environment;

[0071] The principle of condensation on the inner wall is that the high-temperature and high-humidity airflow outdoors flows into the room with the air flow. At this time, the dew point temperature of the environment is relatively high. Since the surface temperature of the wall is relatively low, the high-humidity gas contacts the low-temperature wall, ceiling and other surfaces and condenses into dew on their surfaces. Therefore, the present invention uses the difference between the ambient dew point temperature and the inner wall surface temperature when no coating is applied under the construction environment as the threshold value T. 阈值 .

[0072] Application case: actual working condition verification

[0073] 1. Test materials: Several brands of paint purchased from the market and numbered 1, 2, 3, and 4.

[0074] 2. Test methods:

[0075] 1. Detection by the method of the present invention: The critical condensation temperature of the sample to be tested of the coating to be tested and the sample temperature control temperature when the critical condensation temperature is obtained are detected by the method described in Examples 2-3 of the present invention, and the insulation temperature difference ΔT between the two is calculated; during the test, the temperature and humidity of the simulated environment are the same as the ambient temperature and humidity during the actual verification of the working conditions;

[0076] 2. Actual working condition verification: It was carried out in a specific basement in Beijing. The details are as follows: The basement is located in Beijing. Due to the unique geographical layout and ventilation conditions of the basement, it has become a high-incidence area for condensation. After on-site data collection, it was confirmed that the environmental parameters of the basement are: the room temperature fluctuates around 24°C, the relative humidity is as high as 70%, and the wall temperature is 16°C (that is, T 环表面 ), such temperature difference and humidity conditions are very likely to trigger condensation on the wall. After testing with the invented method, the construction was verified under this working condition, and Figure 4-5 The color change diagrams of the water-changing test paper when the surface of the sample to be tested is damp (condensation) and when it is not damp (no condensation) are respectively given.

[0077] 3. Method Implementation

[0078] 1. The method of the present invention detects:

[0079] 1) Preparation of No. 1, 2, 3, and 4 anti-condensation coating sample plates: coating the anti-condensation coating layer with the same thickness of 2 mm on the test substrate, and after sufficient curing, installing it on the sample temperature control table of the present invention for systematic testing,

[0080] 2) Set the internal temperature of the test chamber to 24°C and the humidity to 70% to simulate the temperature and humidity environment of the basement. Gradually reduce the temperature from 24°C by 1°C, keep each temperature for 1 hour, find the actual temperature of the sample to be tested when the surface of the sample to be tested is first damp (i.e. the test paper changes color), and obtain the critical condensation temperature of the sample to be tested under the simulated environment of 18°C. At the same time, read the sample temperature control temperature (the display temperature of the temperature control temperature sensor) when the critical condensation temperature is obtained, and obtain the temperature of the temperature control station of sample plate No. 1 is 16°C, the temperature of the temperature control station of sample plate No. 2 is 16.5°C, the temperature of the temperature control station of sample plate No. 3 is 16.9°C, and the temperature of the temperature control station of sample plate No. 4 is 17.4°C. 3) After calculation, the insulation temperature difference of sample plate No. 1 is 2°C, the insulation temperature difference of sample plate No. 2 is 1.5°C, the temperature of the temperature control station of sample plate No. 3 is 1.1°C, and the temperature of the temperature control station of sample plate No. 4 is 0.6°C.

[0081] 4) Anti-condensation performance evaluation: Under the simulated test environment, the insulation temperature difference ΔT of the sample to be tested is greater than or equal to the specified threshold T 阈值 , the anti-condensation performance of the tested sample is qualified, at this time T threshold = 18℃ (T 环露 )-16℃(T 环表面 ); According to the comparison of the insulation temperature difference ΔT of different samples to be tested, the anti-condensation performance is ranked as follows: No. 1 coating > No. 2 coating > No. 3 coating > No. 4 coating.

[0082] 2. Verification under actual working conditions: After the construction and maintenance of different coatings under actual working conditions, the condensation situation is observed to verify whether the detection results of the method of the present invention are accurate.

[0083] 4. Test results:

[0084] Table 1

[0085]

[0086]

[0087] From the data in the table, we can see that: 1) Due to different temperature and humidity conditions, the threshold value T of the insulation temperature difference 阈值 is different. In this test, the dew point temperature is 18°C ​​(obtained from the enthalpy-humidity diagram, see Figure 6 ), under this construction condition, the temperature of the uncoated wall is 16°C, so T 阈值 =2℃, when the insulation temperature difference is greater than or equal to 2℃, therefore, in this environment, coating No. 1 passes the anti-condensation performance test, while other coatings fail.

[0088] 2) Under the simulated environment, the anti-condensation performance of each coating is as follows: coating No. 1 > coating No. 2 > coating No. 3 > coating No. 4.

[0089] Compared with the traditional method, the accuracy of the method of the present invention for evaluating the anti-condensation performance is significantly improved.

[0090] 3) According to the actual verification results of working conditions, the coatings that do not produce condensation in actual working conditions are the coatings whose anti-condensation performance is qualified as determined by this method, and the coatings that produce condensation are the coatings that are unqualified as determined by this method. Therefore, the evaluation results of this method are relatively accurate and reliable.

[0091] The above-described embodiments are only preferred embodiments of the present invention, and are not exhaustive of the feasible implementations of the present invention. For those skilled in the art, any obvious changes made thereto without departing from the principles and spirit of the present invention should be considered to be included in the scope of protection of the claims of the present invention.

Claims

1. A coating sample anti-condensation performance simulation test device, characterized in that: The invention comprises an indoor environment simulation box and an inner wall temperature simulation device which is arranged in the indoor environment simulation box and is used for controlling the temperature of a sample to be tested.

2. A coating sample anti-condensation performance simulation test device according to claim 1, characterized in that: The indoor environment simulation box adopts a constant temperature and humidity test box, and the constant temperature and humidity test box is provided with a sealed door and a transparent observation window for opening or closing the constant temperature and humidity test box.

3. A coating sample anti-condensation performance simulation test device according to claim 1, characterized in that: The inner wall temperature simulation device comprises a sample temperature control platform, a heat conductive template arranged on the sample temperature control platform and used for coating the sample to be tested, and a sample monitoring temperature sensor arranged on the heat conductive template and buried in the sample to be tested.

4. A coating sample anti-condensation performance simulation test device according to claim 3, characterized in that: The surface of the sample to be tested is provided with a water-discoloring test paper.

5. The device for simulating the test of the anti-condensation performance of a coating sample according to claim 3, characterized in that: The sample temperature control stage includes a semiconductor refrigeration stage, and a temperature control temperature sensor disposed in the semiconductor refrigeration stage and close to one side of the thermally conductive sample plate; A heat-conducting adhesive layer is arranged between the cold end of the semiconductor refrigeration stage and the heat-conducting sample plate.

6. The device for simulating the test of the anti-condensation performance of a coating sample according to claim 3, characterized in that: It also includes a computer and a temperature and humidity controller, and the temperature and humidity controller is respectively connected to the indoor environment simulation box and the sample temperature control station for communication.

7. A method for evaluating the anti-condensation performance of a coating, characterized in that: The coating sample anti-condensation performance simulation test device as described in any one of claims 1 to 6 is used to measure the critical condensation temperature of the sample to be tested and the sample temperature control temperature when the critical condensation temperature is obtained, and the difference between the critical condensation temperature of the sample to be tested and the sample temperature control temperature when the critical condensation temperature is obtained is calculated as the insulation temperature difference ΔT of the sample to be tested, and the insulation temperature difference ΔT=T 结露 -T 温控 ; Then, the anti-condensation performance of the sample to be tested is evaluated using the insulation temperature difference ΔT of the sample to be tested under the simulated test environment as an indicator.

8. The method for evaluating the anti-condensation performance of a coating according to claim 7, characterized in that: The evaluation method is: under the simulated test environment, the insulation temperature difference ΔT of the sample to be tested is greater than or equal to the specified threshold value T 阈值 , the anti-condensation performance of the tested sample is qualified; under the same simulated test environment, the larger the insulation temperature difference ΔT of different tested samples, the better the anti-condensation performance of the tested sample.

9. The method for evaluating the anti-condensation performance of a coating according to claim 7, characterized in that: The method of using the coating sample anti-condensation performance simulation test device to determine the critical condensation temperature of the sample to be tested and obtaining the sample temperature control temperature at the critical condensation temperature includes: Step 1: The coating to be tested is applied to a thermal conductive sample plate, and after curing, a sample to be tested is obtained; Step 2: Set the temperature and humidity of the indoor environment simulation box through the temperature and humidity controller; Step 3. Under the simulated test environment, use the sample temperature control station to control the temperature of the sample to be tested, use the sample temperature control sensor to monitor the temperature control temperature of the sample temperature control station, use the sample temperature monitoring sensor to monitor the actual temperature of the sample to be tested, set the sample temperature control station to the ambient temperature initially, and then gradually lower the temperature in a gradient of 0.1°C. After each temperature is kept warm for a specified time, find the actual temperature of the sample to be tested when moisture first appears on the surface of the sample to be tested, which is the critical condensation temperature of the sample to be tested under the simulated environment, and read the sample temperature control temperature when the critical condensation temperature is obtained.

10. The method for evaluating the anti-condensation performance of a coating according to claim 7, characterized in that: Method for determining the specified threshold value: Under the construction environment, the difference between the ambient dew point temperature and the interior wall surface temperature when no coating is applied is taken as the threshold value T 阈值 ; T 阈值 =T 环露 -T 环表面 ; T 环露 : Ambient dew point temperature in the construction environment; T 环表面 : The surface temperature of the interior wall before coating in the actual construction environment.

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