CN202166580U - Mechanical thermostat humidity control functional material performance testing equipment - Google Patents

Abstract

The utility model discloses a mechanical constant temperature box humidity control function material performance test equipment, which comprises a relative humidity control part, a weighing part and a temperature and humidity monitoring part. , the temperature probe and humidity probe of the weighing part and the temperature and humidity monitoring part are placed in the confined space, the weighing part is an electronic balance, and the electronic balance, temperature probe and humidity probe are all connected to a computer located outside the confined space . The utility model can accurately measure the humidity control performance of the material, and the test result has good stability.

Description

Mechanical thermostat humidity control functional material performance testing equipment

technical field

The utility model belongs to the field of material testing, and relates to a novel performance testing system for humidity-regulating functional materials, which can be used for testing the humidity-regulating properties of various materials by means of a humidity response method.

Background technique

The level of relative air humidity affects people's work and life. Humidity control is particularly important for people's living environment and protection of objects. With the development of technology and new material technology, people have successively developed materials with humidity adjustment function, and widely used this material in building materials, textile products and other products, so that traditional products can not only meet the original use function, but also have It has the ability to adjust the relative humidity of the environment and improve the comfort of the living space.

The development of products with humidity control function is very fast. Humidity control function coatings, wallpapers, putty, ceramics and other products flood into the market, but the development of corresponding detection methods and equipment is relatively lagging behind, which seriously affects the development of the industry. At present, there are two main methods for testing the humidity control performance of materials on the market: the humidity response method and the temperature response method. The temperature response method is to put the material into a sealed box, and change the humidity in the box by changing the temperature around the box. According to the changes in the humidity and temperature in the box, the absorption and release of the material for every 1°C change is calculated by calculation. humidity. Changes in temperature and humidity in daily life are mainly caused by changes in the water vapor content in the air, and are less affected by ambient temperature. However, in real life, the change of ambient temperature difference is not very large, and it is difficult to affect the saturated moisture absorption capacity of the product. The humidity reaction method uses the change of relative humidity inside the constant temperature and humidity test box. Under the change of relative humidity, due to the effect of the difference between internal and external humidity, the test sample absorbs or releases water vapor to the surrounding environment. According to the change value of the test sample quality, the sample is measured. The size of the humidity control ability. Compared with the temperature response method, the humidity response method has strong practicability and popularization, and is simple and easy to operate. In addition, the main factor affecting the moisture absorption and desorption of the product is the change in the relative humidity of the environment, so most enterprises adopt it. The humidity reaction method is used as a testing method for the moisture absorption and desorption performance of the product.

At present, the instruments widely used to test the humidity control performance by the humidity reaction method are often a combination of constant temperature and humidity test chambers and electronic balances. Among them, the constant temperature and humidity test chamber can control the temperature and humidity of the test environment by mechanically controlling the temperature and humidity. Due to the development of mechanical control technology, the accuracy of temperature and humidity can meet the requirements of the test. However, since the internal air velocity cannot be controlled, and the air flow on the surface of the test sample has a great influence on the test results, it is necessary to solve this problem and form a more complete humidity control performance detection system; on the other hand, due to the need for electronic balance readings, often To open and close the door of the test chamber during the experiment will affect the stability of the test environment.

Utility model content

The purpose of the utility model is to provide a complete set of performance testing equipment for mechanical thermostat humidity control functional materials with improved test stability.

The utility model mechanical constant temperature box humidity control functional material performance testing equipment comprises a relative humidity control part, a weighing part and a temperature and humidity monitoring part, the relative humidity control part has a closed space with adjustable temperature and humidity, and the weighing part And the temperature and humidity monitoring part is placed in the closed space, the weighing part is an electronic balance, and the temperature and humidity monitoring part includes a temperature probe and a humidity probe. external computer.

The relative humidity control part is a mechanical constant temperature box, and a closed space is formed by a constant temperature and humidity box. The sample to be tested is placed on an electronic balance, and the temperature probe and the humidity probe are respectively located at a position 50 mm above the sample to be tested. The temperature probe, the humidity probe and the electronic balance are equipped with a windshield, and a plurality of through holes are left on the side wall of the windshield.

The internal volume of the enclosed space is not less than 0.5m ³ .

The through holes on the side wall of the windshield are evenly or unevenly distributed on the left and right sides.

The diameter of the through hole on the side wall of the windshield is 1.5 cm to 3 cm.

The through holes on the side walls of the windshield are not equal in size.

The volume of the windshield is not less than 0.3m ³ .

The utility model is mainly composed of a relative humidity control part, a weighing part and a temperature and humidity monitoring part, wherein a mechanical constant temperature box system with a protective cover is used as the relative humidity control part. The utility model can detect the moisture absorption and desorption performance of the material by the humidity reaction method, record the detected sample data weighed by the electronic balance in real time through a computer, and calculate the moisture absorption and desorption capacity of the sample. Due to the addition of a windshield, the utility model can reduce the influence of the airflow above the internal testing sample on the test results, and at the same time ensure a certain airflow velocity, keep the temperature and humidity of the internal environment uniform and accurate, and control the temperature and humidity of the test environment At the same time, it makes the test results more accurate and reduces the influence of environmental factors on the test results. It can not only accurately measure the humidity control performance of the material, but also has good stability of the test results.

Description of drawings

Fig. 1 is a schematic diagram of the composition of the utility model mechanical thermostat humidity control functional material performance testing equipment.

Fig. 2 is a mass-time variation curve of the utility model for detection of humidity-adjusting wallpaper and humidity-adjusting ceramic tile samples.

Detailed ways

The utility model is made for the establishment of industry standards for humidity-regulating building materials. It mainly provides a reasonable, scientific and stable performance test system for humidity control materials, which is used to test the moisture absorption and desorption performance of materials by the humidity reaction method.

The humidity control material testing equipment of the utility model is mainly composed of a relative humidity control part, a weighing part and a temperature and humidity monitoring part. The relative humidity control part is used to manufacture and maintain the test environment of the test sample; the weighing part is an electronic balance, which is used to accurately weigh the test sample in real time; the temperature and humidity monitoring part includes a temperature probe and a humidity probe, which extend into the relative humidity control part The device is located above the surface of the test sample to monitor the temperature and humidity of the sample surface; the electronic balance, temperature probe and humidity probe are all connected to an external computer to record and display their respective changing values, realize real-time monitoring of data, and at the same time avoid the opening and closing of the switch box door. Detect the impact of the environment.

1. Relative humidity control part

In the utility model, the relative humidity control part can be realized by a mechanical constant temperature box according to the test requirements.

in:

Referring to Fig. 1, the mechanical constant temperature chamber is to utilize the constant temperature and humidity test chamber to control the temperature and relative humidity of the test environment, place the electronic balance 2 of the weighing part in an existing constant temperature and humidity chamber 1, and then place the sample to be tested S is placed on the electronic balance 2, and the temperature probe 3 and the humidity probe 4 of the monitoring part are respectively suspended at a position 50 mm above the sample to be tested, and a windshield 5 is added in the constant temperature and humidity box 1, and the sample S to be tested, The temperature probe 3 , the humidity probe 4 and the electronic balance 2 are simultaneously covered in the windshield 5 , and a large number of through holes are left on the side wall of the windshield 5 . In this system, the internal volume of the constant temperature and humidity chamber 1 is not less than 0.5m ³ , the deviation of the temperature setting in the chamber should not exceed ±0.5°C, and the deviation between the relative humidity and the setting value should not exceed ±2%, (23± At 0.5)°C, the time for the relative humidity to change from 30% to 95% should not exceed 20 minutes; the volume of the windshield 5 should not be less than 0.3m ³ . The distribution of the through holes on the wall is characterized by both left and right sides, and the distribution and size can be irregular. The size of the holes is preferably within the range of 1.5cm to 3cm in diameter. The number of holes is determined according to the size of the wind speed entering the box. While the wind force is small, it also ensures that the internal space of the windshield 5 has a certain wind speed, and ensures that the temperature and humidity of the internal environment quickly reach a balance, so that the corrected water vapor surface resistance value inside the cover is (12.0～14.6)×10 ³ m ² ·h·Pa/ mg range. Due to the addition of the windshield 5, the mechanical incubator can reduce the influence of the airflow above the internal test sample on the test results, and can also ensure a certain airflow velocity to keep the temperature and humidity of the internal environment uniform.

2. Temperature and humidity monitoring part

In the utility model, the temperature and humidity monitoring part is composed of a temperature and humidity detector, wherein the temperature probe 3 and the humidity probe 4 are placed 50 mm above the surface of the sample to be tested, and are used to monitor the air temperature and humidity of the surface of the sample to be tested, so as to adjust the control Test the ambient temperature and humidity to ensure the accuracy of the test results.

3. Weighing part

In the utility model, the weighing part is a highly moisture-proof electronic balance 2, and the reading part is connected with an external computer (not shown in the figure), and the data can be automatically recorded online by the computer, which avoids the need to take out samples and change the internal environment when reading. Affect the test results, but also ensure the continuity and accuracy of the readings.

4. Computer

In the utility model, the computer used is an ordinary desktop or notebook computer, which directly records the real-time mass of the tested sample transmitted by the electronic balance through the computer, and calculates the moisture absorption and desorption of the sample through the obtained numerical value through the pre-installed following formula: quantity:

W _a ＝(m _a -m ₀ )/A ………………………………………(1)

W _d ＝(m _a -m _d )/A ………………………………………(2)

In the formula:

W _a - the amount of moisture absorbed at the end of the moisture absorption process, in kilograms per square meter (kg/m ² );

W _d - the amount of dehumidification at the end of the dehumidification process, in kilograms per square meter (kg/m ² );

m _a - the mass of the sample at the end of the hygroscopic process, in kilograms (kg);

m _d - the mass of the sample at the end of the dehumidification process, in kilograms (kg);

m ₀ - the mass of the sample after curing, in kilograms (kg);

A- The moisture absorption/desorption area of the sample to be measured, in square meters (m ² ).

5. Material moisture absorption and desorption performance test

The testing process of the present utility model is illustrated below by specific detection examples.

(1) Moisture absorption and desorption performance test

Select the decorative material to be tested and use the utility model test system to test the moisture absorption and desorption performance. The materials to be tested are respectively made into samples with an area of 25cm×25cm, and the moisture absorption and release capacity is tested according to the following steps:

1) First place the sample in a constant temperature room at an ambient temperature of (23±0.5)°C and a relative humidity of 33% for 24 hours, until the change in sample quality is no more than 0.1%;

2) Set the relative humidity in the constant temperature and humidity chamber to 93%, put the sample in, install the windshield, start to record the mass of the sample transmitted by the electronic balance by the computer continuously for 24 hours, and calculate the 24h of the sample according to formula (1) Moisture absorption, thus completing the detection of moisture absorption performance;

3) Afterwards, change the relative humidity in the constant temperature and humidity chamber to 33%, and continue to record the mass of the sample transmitted by the electronic balance continuously by the computer for 24 hours, and calculate the dehumidification amount of the sample for 24 hours according to formula (2), thus completing the dehumidification Performance testing.

The test results are shown in Table 2

Table 2 Sample 24h moisture absorption and desorption (unit: kg/m ² )

(2) Repeatability detection of samples

Select a building material product (humidity-adjusting wallpaper), and perform repeated tests on its moisture absorption and desorption properties according to the operation method (1). The test results are shown in Table 3.

Table 3 Repeated test results of humidity control performance of several building materials (unit: kg/m ² )

It can be seen from Table 3 that the relative humidity control part uses the same system to test the same sample, and the test results have good repeatability.

(3) Comparative detection of samples

The test samples provided by Japanese manufacturers were selected, and the mechanical thermostat system was used for testing according to the method (1). The real-time data was recorded by the computer and the sample quality curve was calculated. Compare the test results with the test results provided by the Japanese authoritative testing department provided by the manufacturer to verify whether the test method is reasonable.

Figure 4 is the test record curve of the utility model, according to which the moisture absorption of wallpaper is 47.56×10 ^-3 kg/m ² , and the moisture release is 45.94×10 ^-3 kg/m ² ; the moisture absorption of tiles is 301.92×10 ^-3 kg/m ² , the moisture release capacity is 287.28×10 ^-3 kg/m ² .

According to the test report curve of the Japanese testing agency, the moisture absorption of wallpaper is about 47g/m ² and the moisture release is about 46g/m ² ; the moisture absorption of tiles is about 300g/m ² and the moisture release is about 290g/m ² . By comparing the absolute values of the data, it can be concluded that the error of the test result of the method of the utility model is within 1%, and the test is reasonable and effective.

Claims (8)

1. Mechanical constant temperature box humidity control functional material performance testing equipment, comprising a relative humidity control part, a weighing part and a temperature and humidity monitoring part, it is characterized in that the relative humidity control part has a closed space with adjustable temperature and humidity, and the The weighing part and the temperature and humidity monitoring part are placed in the closed space. The weighing part is an electronic balance, and the temperature and humidity monitoring part includes a temperature probe and a humidity probe. The electronic balance, temperature probe and humidity probe are all connected to a Computers outside the confined space. 2. The device according to claim 1, wherein the relative humidity control part is a mechanical thermostat. 3. according to the described equipment of claim 2, it is characterized in that, described mechanical incubator forms airtight space by a constant temperature and humidity chamber, and the sample to be tested is placed on the electronic balance, and temperature probe and humidity probe are respectively positioned at the top of the sample to be tested At the position of 50mm, a windshield is installed outside the sample to be tested, the temperature probe, the humidity probe and the electronic balance, and a plurality of through holes are left on the side wall of the windshield. 4. The device according to claim 1, 2 or 3, characterized in that the inner volume of the enclosed space is not less than 0.5m ³ . 5 . The device according to claim 3 , wherein the through holes on the side wall of the windshield are evenly or unevenly distributed on the left and right sides. 6 . The device according to claim 3 , wherein the diameter of the through hole on the side wall of the windshield is 1.5 cm to 3 cm. 7 . The device according to claim 6 , wherein the through holes on the side walls of the windshield are unequal in size. 8. The device according to claim 3, wherein the volume of the windshield is not less than 0.3m ³ .

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