Moisture absorption testing device, testing method and application thereof

Abstract

This invention belongs to the field of textile material testing, and relates to a moisture absorption testing device, specifically a moisture absorption testing device, its testing method, and its application. It includes a lifting platform, on which a testing device and a columnar material fixing tube are mounted. The testing device includes a testing plate and a core structure located at the center of the testing plate. The core structure is situated below the columnar material fixing tube and connected to a liquid reservoir via a liquid guide tube. The liquid reservoir is located above an electronic balance; the electronic balance is connected to a data acquisition unit. The dynamic moisture absorption process of the columnar material is recorded and characterized through the testing plate with its upper and lower perforations. This enables performance testing and characterization of upright columnar materials.

Description

Technical Field

[0001] This invention belongs to the field of textile material testing, and relates to a moisture absorption testing device, specifically a moisture absorption testing device, its testing method, and its application. Background Technology

[0002] The water absorption property of textiles refers to their ability to absorb liquid water. When textiles come into contact with liquid water, water is first adsorbed on their surface, then absorbed between the yarns or fibers, and finally seeps into the gaps between the fibers. There are many methods for testing the water absorption of fabrics. The most commonly used methods include the vertical wicking method, which observes the distance the lower end of the fabric strip is immersed in water within a certain time; the fabric droplet method, which observes the time it takes for a droplet to be absorbed on a flat fabric; the fabric settling method, which tests the time required for the sample to go from contact with the water surface to being fully wetted and beginning to sink; and the fabric absorption method, which tests the amount of water absorbed by the fabric when a certain amount of water flows through it. According to the standard ASTM D 5802-1995, methods for testing and evaluating the water absorption of materials, the process of liquid absorption by materials can be described, and the moisture absorption rate of materials at a certain time can be characterized. However, the test methods in this standard are applicable to flat materials and are inconvenient for testing upright cylindrical materials. Patent 201822275718.8 discloses a device for measuring the moisture absorption performance of fabrics. The device uses a disc-shaped sample holder to increase the number of samples taken. It uses a measuring scale to read the data directly. However, due to the many factors affecting the seepage height, the detection of the moisture absorption rate is not very accurate. Summary of the Invention

[0003] This invention proposes a hygroscopicity testing device, its testing method, and its application, which solves the problem of inconvenience in testing vertical columnar materials.

[0004] The technical solution of this invention is implemented as follows:

[0005] A hygroscopicity testing device includes a lifting platform, on which a testing device and a columnar material fixing tube are provided. The testing device includes a testing plate and a core structure of the testing plate located at the center of the testing plate. The core structure of the testing plate is located below the columnar material fixing tube and is connected to a liquid reservoir through a liquid guide tube. The liquid reservoir is located above an electronic balance. The electronic balance is connected to a data acquisition device.

[0006] The aforementioned lifting platform has holes on its surface through which liquid guide tubes can pass.

[0007] The test plate has a diameter greater than 10 cm and a thickness greater than 3 cm. Holes are provided at the center of both the upper and lower surfaces of the test plate. The depth of the holes is half the thickness of the test plate, and the diameter of the holes on the test plate is consistent with the outer diameter of the liquid guide tube.

[0008] The aforementioned test board core structure includes test board core I and test board core II with the same outer diameter; test board core I is annular with a thickness of 1 mm; test board core II is a disc structure with holes of 2-4 mm in diameter evenly distributed on the disc structure.

[0009] The aforementioned columnar material fixing tube is a hollow columnar tube with an outer diameter consistent with the outer diameter of the inner core structure of the test plate; a circular hole is provided above the liquid reservoir for the liquid guide tube to pass through.

[0010] In terms of specific devices:

[0011] The hygroscopicity testing instrument for columnar materials of the present invention includes: a lifting platform, a test plate, a test plate inner core I, a test plate inner core II, a columnar material fixing tube, a liquid guiding tube, an electronic balance, a liquid reservoir, a data transmission line, and a data acquisition device.

[0012] Lifting platform: A commercially manufactured manual lifting platform with holes on the platform surface through which a liquid guide tube can pass.

[0013] Test plate: A smooth, flat acrylic test plate with the following configuration: diameter greater than 10 cm and thickness greater than 3 cm. A hole with a diameter of 4 ± 0.02 mm is located at the center of its lower surface, with a depth equal to half the thickness of the test plate. A hole with a diameter of 15 ± 0.02 mm is located at the center of the upper surface of the test plate, with a depth equal to half the thickness of the test plate.

[0014] Test board core I: a smooth, flat acrylic sheet with the following configuration: outer diameter 14±0.02 mm, inner diameter 13±0.02 mm.

[0015] Test board core II: a smooth, flat acrylic sheet with the following configuration: outer diameter 14±0.02 mm, with evenly distributed holes of 3 mm diameter inside.

[0016] Columnar material fixing tube: A hollow columnar tube with smooth inner and outer walls and flat cut ends. Its configuration is as follows: outer diameter 14±0.02 mm, inner diameter is determined according to the diameter of the columnar material, and length can be determined according to the columnar material.

[0017] Liquid guiding tube: A commercially manufactured silicone tube with smooth inner and outer walls, with the following configuration: outer diameter 4±0.02mm, inner diameter 3±0.02mm.

[0018] Electronic balance: Commercially manufactured electronic balances have a measurement accuracy of 0.001 grams and a maximum load capacity of 400 grams.

[0019] Liquid reservoir: A liquid reservoir made of plexiglass, configured as follows: with a capacity greater than 250 ml, and a circular hole with a diameter greater than 4.2 mm at the top to ensure that the use of the liquid delivery tube is not restricted.

[0020] Data transmission cable: A commercially manufactured data cable that transmits balance readings to a data acquisition unit.

[0021] Data acquisition device: Records the weight reading of the electronic balance at certain time intervals. The data acquisition device can be a computer.

[0022] A method for testing and characterizing the hygroscopicity of columnar materials, which utilizes the aforementioned hygroscopicity testing device, and the testing steps are as follows:

[0023] 1) Instrument assembly: Place the test plate core I and test plate core II into the holes on the upper surface of the test plate in sequence. Connect the liquid guide tube to the holes on the lower surface of the test plate. Place the test plate flat on the lifting platform. Connect the liquid guide tube to the liquid reservoir and place the liquid reservoir on the electronic balance. Connect the electronic balance and the data collector with the data transmission line. The device is now ready.

[0024] 2) Place the columnar material in the columnar material fixing tube, ensuring its bottom surface is against the bottom surface of the hole on the test plate. The test plate is connected to the liquid reservoir via a liquid guide tube. During the test, the height between the bottom surface of the sample and the top surface of the liquid in the reservoir should be maintained at 3±1 mm above the top surface of the liquid. This height difference can be maintained by adjusting the height of the lifting platform during the experiment.

[0025] 3) During the experiment, the liquid is absorbed by the sample. Changes in the liquid in the reservoir are measured by an electronic balance and transmitted to a data collector, recording the weight value at the corresponding time. This continues until the change in the electronic balance reading is less than 0.3 mg of liquid within 5 seconds during the absorption process.

[0026] 4) Stop the data collector from recording data, remove the sample, and the test is over. Repeat the test on the same sample according to the above steps, and process the data recorded in the data collector to obtain the moisture absorption curve of the sample. Calculate the absorption rate of the sample (unit: mL / s) at any time when needed.

[0027] The present invention has the following beneficial effects:

[0028] 1. The present invention improves the accuracy of moisture absorption capacity testing by designing large and small holes at the top and bottom of the test plate. The large hole provides a moisture absorption plane that is flush with the bottom surface of the test sample for the columnar moisture-absorbing material being tested, thereby improving the accuracy of the moisture absorption capacity test. The maximum moisture absorption rate error for multiple tests of the same sample is 0.82.

[0029] 2. This invention uses a columnar material fixing tube with a fixed outer diameter and an inner diameter that can be selected according to the diameter of the sample to be tested. The outer diameter of the columnar material fixing tube is tangent to the large hole of the test plate, so as to avoid the impact of shaking of the sample to be tested on the accuracy of the test results.

[0030] 3. Compared with other methods for testing columnar hygroscopic materials, this invention features a test plate core II. Since this invention tests the sample based on the siphon principle, and the bottom of the sample is lower than the liquid level in the reservoir, the small hole design of the test plate core II provides feasibility for the active absorption of liquid moisture by the sample. The hygroscopic capacity of the sample is evaluated by the liquid absorption content and moisture absorption rate per unit time, which has high accuracy and avoids errors caused by subjective measurement.

[0031] 4. The device of the present invention is simple, easy to operate, and has high data accuracy, providing a repeatable detection method for testing the hygroscopic properties of columnar materials. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the moisture absorption process detection device.

[0034] Figure 2 This is a schematic diagram of the core I structure of the test board.

[0035] Figure 3 This is a schematic diagram of the core II structure of the test board.

[0036] Figure 4 The moisture absorption process curve is shown in Example 1.

[0037] Figure 5 This is an electron microscope image of the cross-section of the test sample in Example 2.

[0038] Figure 6 The moisture absorption curves are obtained from three tests of the same sample in Example 2.

[0039] Figure 7 The moisture absorption curves are for five samples with different densities in Example 3. At this time, the pore size of the core II of the test plate is 3 mm.

[0040] Figure 8 The moisture absorption curves are for five samples with different densities in Example 4. At this time, the pore size of the core II of the test plate is 2 mm.

[0041] Figure 9 The moisture absorption curves are for five samples with different densities in Example 5. At this time, the pore size of the core II of the test plate is 4 mm.

[0042] Figure 10The moisture absorption rates of five samples with different densities in Examples 3, 4, and 5 are shown.

[0043] Figure 11 The graph shows the change in water content of five samples with different densities after 120 seconds of testing in Examples 3, 4, and 5. Detailed Implementation

[0044] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0045] A hygroscopicity testing device includes a lifting platform 1, on which a testing device and a columnar material fixing tube 5 are provided. The testing device includes a test plate 2 and a test plate core structure disposed at the center of the test plate 2. The test plate core structure is located below the columnar material fixing tube 5 and is connected to a liquid reservoir 8 through a liquid guide tube 6. The liquid reservoir 8 is located above an electronic balance 7. The electronic balance 7 is connected to a data acquisition device 10.

[0046] The aforementioned lifting platform 1 has holes on its surface through which the liquid guide tube 6 can pass.

[0047] The test plate 2 has a diameter greater than 10 cm and a thickness greater than 3 cm. Holes are provided at the center of both the upper and lower surfaces of the test plate 2. The depth of the holes is half the thickness of the test plate 2. The diameter of the holes on the test plate 2 is consistent with the outer diameter of the liquid guide tube 6.

[0048] The aforementioned test board core structure includes test board core I3 and test board core II4 with the same outer diameter; test board core I3 is annular with a thickness of 1 mm; test board core II4 is a disc structure with holes of 2-4 mm in diameter evenly distributed on the disc structure.

[0049] The aforementioned columnar material fixing tube 5 is a hollow columnar tube with an outer diameter consistent with the outer diameter of the inner core structure of the test plate; a circular hole is provided above the liquid reservoir 8 for the liquid guide tube 6 to pass through.

[0050] The following description uses a specific design of the device as an example:

[0051] Example 1

[0052] The hygroscopicity testing device of this embodiment includes a lifting platform 1, on which a testing device and a columnar material fixing tube 5 are provided. The testing device includes a test plate 2 and a test plate core structure disposed at the center of the test plate 2. The test plate core structure is located below the columnar material fixing tube 5 and is connected to a liquid reservoir 8 through a liquid guide tube 6. The liquid reservoir 8 is located above an electronic balance 7. The electronic balance 7 is connected to a data acquisition device 10.

[0053] The aforementioned lifting platform 1 is a commercially manufactured manual lifting platform, and the lifting platform 1 has holes on its surface through which the liquid guide tube 6 can pass.

[0054] The test plate 2 has a diameter of 15 cm and a thickness of 4 cm. Holes are located at the center of both the upper and lower surfaces of the test plate 2, with a depth equal to half the thickness of the test plate 2. The diameter of the holes on the test plate 2 matches the outer diameter of the liquid guide tube 6. A hole with a diameter of 4 ± 0.02 mm is located at the center of the lower surface of the test plate 2, with a depth equal to half the thickness of the test plate 2. A hole with a diameter of 15 ± 0.02 mm is located at the center of the upper surface of the test plate 2, with a depth equal to half the thickness of the test plate 2.

[0055] The test board core I3 is a smooth, flat, annular acrylic sheet, and the test board core II4 is a smooth, flat, porous disc-shaped acrylic sheet. The test board core structure includes test board core I3 and test board core II4 with the same outer diameter. Test board core I3 is annular with an outer diameter of 14±0.02 mm, an inner diameter of 13±0.02 mm, and a thickness of 1 mm. Test board core II4 is a disc structure with an outer diameter of 14±0.02 mm and holes with a diameter of 3 mm evenly distributed on test board core II4.

[0056] The aforementioned columnar material fixing tube 5 is a hollow columnar tube with smooth inner and outer walls and flat cut ends. Its outer diameter is consistent with the outer diameter of the core structure of the test plate, and its inner diameter is determined according to the diameter of the columnar material. Its length can be determined according to the columnar material. A circular hole is provided above the liquid reservoir 8 for the liquid guide tube 6 to pass through.

[0057] The aforementioned liquid guide tube is a commercially manufactured silicone tube with smooth inner and outer walls, and its configuration is as follows: outer diameter 4±0.02 mm, inner diameter 3±0.02 mm.

[0058] The aforementioned electronic balance is a commercially produced electronic balance with a measurement accuracy of 0.001 grams and a maximum load capacity of 400 grams.

[0059] The above-mentioned liquid storage container is made of plexiglass and is configured as follows: the capacity is greater than 250 ml, and there is a circular hole with a diameter greater than 4.2 mm at the top to ensure that the use of the liquid delivery tube is not restricted.

[0060] The aforementioned data transmission line is a commercially manufactured data line capable of transmitting balance readings to a data acquisition unit.

[0061] The aforementioned data acquisition device records the weight readings of the electronic balance at corresponding time intervals. The moisture absorption curve is shown below. Figure 4 As shown.

[0062] Example 2

[0063] The hygroscopicity testing device of this embodiment includes a lifting platform 1, on which a testing device and a columnar material fixing tube 5 are provided. The testing device includes a test plate 2 and a test plate core structure disposed at the center of the test plate 2. The test plate core structure is located below the columnar material fixing tube 5 and is connected to a liquid reservoir 8 through a liquid guide tube 6. The liquid reservoir 8 is located above an electronic balance 7. The electronic balance 7 is connected to a data acquisition device 10.

[0064] The aforementioned lifting platform 1 is a commercially manufactured manual lifting platform, and the lifting platform 1 has holes on its surface through which the liquid guide tube 6 can pass.

[0065] The test plate 2 has a diameter of 15 cm and a thickness of 4 cm. Holes are located at the center of both the upper and lower surfaces of the test plate 2, with a depth equal to half the thickness of the test plate 2. The diameter of the holes on the test plate 2 matches the outer diameter of the liquid guide tube 6. A hole with a diameter of 4 ± 0.02 mm is located at the center of the lower surface of the test plate 2, with a depth equal to half the thickness of the test plate 2; a hole with a diameter of 4 ± 0.02 mm is also located at the center of the upper surface of the test plate 2, with a depth equal to half the thickness of the test plate 2.

[0066] The test board core I3 is a smooth, flat, annular acrylic sheet, and the test board core II4 is a smooth, flat, porous disc-shaped acrylic sheet. The test board core structure includes test board core I3 and test board core II4 with the same outer diameter. Test board core I3 is annular with an outer diameter of 14±0.02 mm, an inner diameter of 13±0.02 mm, and a thickness of 1 mm. Test board core II4 is a disc structure with an outer diameter of 14±0.02 mm and holes with a diameter of 3 mm evenly distributed on test board core II4.

[0067] The aforementioned columnar material fixing tube 5 is a hollow columnar tube with smooth inner and outer walls and flat cut ends. Its outer diameter is consistent with the outer diameter of the core structure of the test plate, and its inner diameter is determined according to the diameter of the columnar material. Its length can be determined according to the columnar material. A circular hole is provided above the liquid reservoir 8 for the liquid guide tube 6 to pass through.

[0068] The aforementioned liquid guide tube is a commercially manufactured silicone tube with smooth inner and outer walls, and its configuration is as follows: outer diameter 4±0.02 mm, inner diameter 3±0.02 mm.

[0069] The aforementioned electronic balance is a commercially produced electronic balance with a measurement accuracy of 0.001 grams and a maximum load capacity of 400 grams.

[0070] The above-mentioned liquid storage container is made of plexiglass and is configured as follows: the capacity is greater than 250 ml, and there is a circular hole with a diameter greater than 4.2 mm at the top to ensure that the use of the liquid delivery tube is not restricted.

[0071] The aforementioned data transmission line is a commercially manufactured data line capable of transmitting balance readings to a data acquisition unit.

[0072] The aforementioned data acquisition device records the weight readings of the electronic balance at corresponding time intervals. The moisture absorption curve is shown below. Figure 5 As shown, the moisture absorption rate is as follows Figure 6 As shown.

[0073] Example 3

[0074] The hygroscopicity testing device of this embodiment includes a lifting platform 1, on which a testing device and a columnar material fixing tube 5 are provided. The testing device includes a test plate 2 and a test plate core structure disposed at the center of the test plate 2. The test plate core structure is located below the columnar material fixing tube 5 and is connected to a liquid reservoir 8 through a liquid guide tube 6. The liquid reservoir 8 is located above an electronic balance 7. The electronic balance 7 is connected to a data acquisition device 10.

[0075] The aforementioned lifting platform 1 is a commercially manufactured manual lifting platform, and the lifting platform 1 has holes on its surface through which the liquid guide tube 6 can pass.

[0076] The test plate 2 has a diameter of 15 cm and a thickness of 4 cm. Holes are located at the center of both the upper and lower surfaces of the test plate 2, with a depth equal to half the thickness of the test plate 2. The diameter of the holes on the test plate 2 matches the outer diameter of the liquid guide tube 6. A hole with a diameter of 4 ± 0.02 mm is located at the center of the lower surface of the test plate 2, with a depth equal to half the thickness of the test plate 2. A hole with a diameter of 15 ± 0.02 mm is located at the center of the upper surface of the test plate 2, with a depth equal to half the thickness of the test plate 2.

[0077] The test board core I3 is a smooth, flat, annular acrylic sheet, and the test board core II4 is a smooth, flat, porous disc-shaped acrylic sheet. The test board core structure includes test board core I3 and test board core II4 with the same outer diameter. Test board core I3 is annular with an outer diameter of 14±0.02 mm, an inner diameter of 13±0.02 mm, and a thickness of 1 mm. Test board core II4 is a disc structure with an outer diameter of 14±0.02 mm and holes with a diameter of 3 mm evenly distributed on test board core II4.

[0078] The aforementioned columnar material fixing tube 5 is a hollow columnar tube with smooth inner and outer walls and flat cut ends. Its outer diameter is consistent with the outer diameter of the core structure of the test plate, and its inner diameter is determined according to the diameter of the columnar material. Its length can be determined according to the columnar material. A circular hole is provided above the liquid reservoir 8 for the liquid guide tube 6 to pass through.

[0079] The aforementioned liquid guide tube is a commercially manufactured silicone tube with smooth inner and outer walls, and its configuration is as follows: outer diameter 4±0.02 mm, inner diameter 3±0.02 mm.

[0080] The aforementioned electronic balance is a commercially produced electronic balance with a measurement accuracy of 0.001 grams and a maximum load capacity of 400 grams.

[0081] The above-mentioned liquid storage container is made of plexiglass and is configured as follows: the capacity is greater than 250 ml, and there is a circular hole with a diameter greater than 4.2 mm at the top to ensure that the use of the liquid delivery tube is not restricted.

[0082] The aforementioned data transmission line is a commercially manufactured data line capable of transmitting balance readings to a data acquisition unit.

[0083] The aforementioned data acquisition device records the weight reading of the electronic balance at certain time intervals.

[0084] Moisture absorption curve as shown Figure 7 As shown, the moisture absorption rate is as follows Figure 10 As shown, the water content is as follows Figure 11 As shown.

[0085] Example 4

[0086] The hygroscopicity testing device of this embodiment includes a lifting platform 1, on which a testing device and a columnar material fixing tube 5 are provided. The testing device includes a test plate 2 and a test plate core structure disposed at the center of the test plate 2. The test plate core structure is located below the columnar material fixing tube 5 and is connected to a liquid reservoir 8 through a liquid guide tube 6. The liquid reservoir 8 is located above an electronic balance 7. The electronic balance 7 is connected to a data acquisition device 10.

[0087] The aforementioned lifting platform 1 is a commercially manufactured manual lifting platform, and the lifting platform 1 has holes on its surface through which the liquid guide tube 6 can pass.

[0088] The test plate 2 has a diameter of 15 cm and a thickness of 4 cm. Holes are located at the center of both the upper and lower surfaces of the test plate 2, with a depth equal to half the thickness of the test plate 2. The diameter of the holes on the test plate 2 matches the outer diameter of the liquid guide tube 6. A hole with a diameter of 4 ± 0.02 mm is located at the center of the lower surface of the test plate 2, with a depth equal to half the thickness of the test plate 2. A hole with a diameter of 15 ± 0.02 mm is located at the center of the upper surface of the test plate 2, with a depth equal to half the thickness of the test plate 2.

[0089] The test board core I3 is a smooth, flat, annular acrylic sheet, and the test board core II4 is a smooth, flat, porous disc-shaped acrylic sheet. The test board core structure includes test board core I3 and test board core II4 with the same outer diameter. Test board core I3 is annular with an outer diameter of 14±0.02 mm, an inner diameter of 13±0.02 mm, and a thickness of 1 mm. Test board core II4 is a disc structure with an outer diameter of 14±0.02 mm and holes with a diameter of 2 mm evenly distributed on test board core II4.

[0090] The aforementioned columnar material fixing tube 5 is a hollow columnar tube with smooth inner and outer walls and flat cut ends. Its outer diameter is consistent with the outer diameter of the core structure of the test plate, and its inner diameter is determined according to the diameter of the columnar material. Its length can be determined according to the columnar material. A circular hole is provided above the liquid reservoir 8 for the liquid guide tube 6 to pass through.

[0091] The aforementioned liquid guide tube is a commercially manufactured silicone tube with smooth inner and outer walls, and its configuration is as follows: outer diameter 4±0.02 mm, inner diameter 3±0.02 mm.

[0092] The aforementioned electronic balance is a commercially produced electronic balance with a measurement accuracy of 0.001 grams and a maximum load capacity of 400 grams.

[0093] The above-mentioned liquid storage container is made of plexiglass and is configured as follows: the capacity is greater than 250 ml, and there is a circular hole with a diameter greater than 4.2 mm at the top to ensure that the use of the liquid delivery tube is not restricted.

[0094] The aforementioned data transmission line is a commercially manufactured data line capable of transmitting balance readings to a data acquisition unit.

[0095] The aforementioned data acquisition device records the weight reading of the electronic balance at certain time intervals.

[0096] Moisture absorption curve as shown Figure 8 As shown, the moisture absorption rate is as follows Figure 10 As shown, the water content is as follows Figure 11 As shown.

[0097] Example 5

[0098] The hygroscopicity testing device of this embodiment includes a lifting platform 1, on which a testing device and a columnar material fixing tube 5 are provided. The testing device includes a test plate 2 and a test plate core structure disposed at the center of the test plate 2. The test plate core structure is located below the columnar material fixing tube 5 and is connected to a liquid reservoir 8 through a liquid guide tube 6. The liquid reservoir 8 is located above an electronic balance 7. The electronic balance 7 is connected to a data acquisition device 10.

[0099] The aforementioned lifting platform 1 is a commercially manufactured manual lifting platform, and the lifting platform 1 has holes on its surface through which the liquid guide tube 6 can pass.

[0100] The test plate 2 has a diameter of 15 cm and a thickness of 4 cm. Holes are located at the center of both the upper and lower surfaces of the test plate 2, with a depth equal to half the thickness of the test plate 2. The diameter of the holes on the test plate 2 matches the outer diameter of the liquid guide tube 6. A hole with a diameter of 4 ± 0.02 mm is located at the center of the lower surface of the test plate 2, with a depth equal to half the thickness of the test plate 2. A hole with a diameter of 15 ± 0.02 mm is located at the center of the upper surface of the test plate 2, with a depth equal to half the thickness of the test plate 2.

[0101] The test board core I3 is a smooth, flat, annular acrylic sheet, and the test board core II4 is a smooth, flat, porous disc-shaped acrylic sheet. The test board core structure includes test board core I3 and test board core II4 with the same outer diameter. Test board core I3 is annular with an outer diameter of 14±0.02 mm, an inner diameter of 13±0.02 mm, and a thickness of 1 mm. Test board core II4 is a disc structure with an outer diameter of 14±0.02 mm and holes with a diameter of 4 mm evenly distributed on test board core II4.

[0102] The aforementioned columnar material fixing tube 5 is a hollow columnar tube with smooth inner and outer walls and flat cut ends. Its outer diameter is consistent with the outer diameter of the core structure of the test plate, and its inner diameter is determined according to the diameter of the columnar material. Its length can be determined according to the columnar material. A circular hole is provided above the liquid reservoir 8 for the liquid guide tube 6 to pass through.

[0103] The aforementioned liquid guide tube is a commercially manufactured silicone tube with smooth inner and outer walls, and its configuration is as follows: outer diameter 4±0.02 mm, inner diameter 3±0.02 mm.

[0104] The aforementioned electronic balance is a commercially produced electronic balance with a measurement accuracy of 0.001 grams and a maximum load capacity of 400 grams.

[0105] The above-mentioned liquid storage container is made of plexiglass and is configured as follows: the capacity is greater than 250 ml, and there is a circular hole with a diameter greater than 4.2 mm at the top to ensure that the use of the liquid delivery tube is not restricted.

[0106] The aforementioned data transmission line is a commercially manufactured data line capable of transmitting balance readings to a data acquisition unit.

[0107] The aforementioned data acquisition device records the weight reading of the electronic balance at certain time intervals.

[0108] Moisture absorption curve as shown Figure 9 As shown, the moisture absorption rate is as follows Figure 10 As shown, the water content is as follows Figure 11 As shown.

[0109] Implementation Results Example

[0110] 1. Taking the hygroscopicity testing device in Example 1 as an example, the columnar material sample is tested. The testing steps are as follows:

[0111] (1) Instrument assembly: Place the inner core I and inner core II of the test plate into the holes on the test plate in sequence, connect the liquid guide tube to the lower hole of the test plate, and place the test plate flat on the lifting platform; connect the liquid guide tube to the liquid reservoir, and place the liquid reservoir on the electronic balance; connect the electronic balance and the data collector with the data transmission line, and the device is ready.

[0112] (2) Place the columnar material in the columnar material fixing tube, so that its bottom surface is attached to the bottom surface of the hole on the test plate. The test plate is connected to the liquid reservoir through the liquid guide tube. During the test, the height between the bottom surface of the sample and the top surface of the liquid in the liquid reservoir should be maintained at 3±1 mm above the top surface of the liquid. During the experiment, the height difference between the two can be maintained by adjusting the height of the lifting platform.

[0113] (3) During the experiment, the liquid was absorbed by the sample. The change in the liquid in the reservoir was measured by an electronic balance and transmitted to the data collector to record the weight value at the corresponding time. The absorption process continued until the change in the electronic balance reading was less than 0.3 mg of liquid within 5 seconds.

[0114] (4) Stop the data collector from recording data, remove the sample, and the test is complete. Repeat the test on the same sample according to the above steps. Process the data recorded in the data collector to obtain the moisture absorption curve of the sample, such as... Figure 4 and Figure 6 As shown, by Figure 4 and Figure 6 As can be seen, the device obtained in this application can calculate the absorption rate, i.e., the slope (unit: mL / s), of a sample at any time when needed.

[0115] 2. Using the hygroscopicity testing device of Example 2, the same sample was tested three times. The steps were as follows:

[0116] (1) Instrument assembly: Place the inner core I and inner core II of the test plate into the holes on the test plate in sequence, connect the liquid guide tube to the lower hole of the test plate, and place the test plate flat on the lifting platform; connect the liquid guide tube to the liquid reservoir, and place the liquid reservoir on the electronic balance; connect the electronic balance and the data collector with the data transmission line, and the device is ready.

[0117] (2) Place the five test samples in the columnar material fixing tube in sequence for testing, and conduct the test according to the method in the implementation effect example. In order to reduce data error, the liquid weight in the reservoir should be replenished in time after each test sample.

[0118] (3) The weight change of the sample absorbed liquid is transmitted to the data acquisition unit.

[0119] (4) The obtained data is processed by computer to obtain the sample moisture absorption curve and the moisture absorption rate of the sample in the required time is calculated.

[0120] 3. Using the hygroscopicity testing device described in Examples 3-5, five samples of different densities were tested. The steps were as follows:

[0121] (1) Instrument assembly: Place the inner core I and inner core II of the test plate into the holes on the test plate in sequence, connect the liquid guide tube to the lower hole of the test plate, and place the test plate flat on the lifting platform; connect the liquid guide tube to the liquid reservoir, and place the liquid reservoir on the electronic balance; connect the electronic balance and the data collector with the data transmission line, and the device is ready.

[0122] (2) Place the five test samples in the columnar material fixing tube in sequence for testing, and conduct the test according to the method in the implementation effect example. In order to reduce data error, the liquid weight in the reservoir should be replenished in time after each test sample.

[0123] (3) The weight change of the sample absorbed liquid is transmitted to the data acquisition unit.

[0124] (4) The obtained data is processed by computer to obtain the sample moisture absorption curve and the moisture absorption rate of the sample in the required time is calculated.

[0125] Moisture absorption rate: The moisture absorption rate of a sample can be represented by the slope at any point when needed (unit: mL / s).

[0126] Formula for calculating moisture absorption rate: (1)

[0127] In the formula: V l The moisture absorption rate is expressed in mL / s. g (t+Δt) is t+Δt The weight of the absorbed liquid, in mL; g ( t )for t The weight of the absorbed liquid, in mL.

[0128] (5) The moisture absorption performance of the sample to be tested was tested according to the above steps. The sample density in Example 2 was 1.6 g / cm³. 3 The characteristics of the samples in Comparative Examples 2-4 are shown in Table 1.

[0129] Table 1. Characteristics of the 5 samples to be tested

[0130]

[0131] The moisture absorption curve of the sample in Example 1 is shown below. Figure 5 As shown in the figure, in the initial stage of the curve, the weight of the sample absorbed increases rapidly, and the slope of the curve is relatively large at this time. After a certain period of time, the trend of the absorption curve tends to flatten. This is mainly because in the initial stage of the liquid climbing from the bottom of the sample, its capillary force is much greater than the gravitational resistance encountered by the liquid climbing. Subsequently, as the weight of the sample liquid absorbed increases, the trend of the curve gradually flattens.

[0132] The cross-sectional electron microscope image of the sample in Example 2 is shown below. Figure 5 ,Depend on Figure 5 It can be seen that the sample is a cylindrical material with a distinct layered structure, which is loose inside and tight outside, formed by two layers of fiber network (micro-nanofiber layer and viscose fiber layer) arranged alternately in the thickness direction.

[0133] The moisture absorption curve and moisture absorption rate of the same sample detected by the apparatus in Example 2 are shown below. Figure 6 ,Depend on Figure 6 It can be seen that the moisture absorption curves obtained from multiple tests on the same sample show basically consistent trends. Furthermore, the maximum moisture absorption rates for each curve are 201.0 mL / s, 205.1 mL / s, and 195.2 mL / s, with an error of 0.82. This extremely small error value indicates that the present invention has high accuracy in testing the moisture absorption capacity of columnar materials.

[0134] Figures 7-9 The figures show the moisture absorption curves of samples with different densities detected by the apparatuses in Examples 3-5, respectively. In the initial stage of the moisture absorption curve, a higher slope indicates a faster moisture absorption rate. Furthermore, it can be seen that as the sample bulk density decreases, the slope of the initial moisture absorption curve increases, indicating a higher final water content in the sample. This may be because the increased porosity with decreasing density facilitates high-speed transport of liquid water upon contact with the sample, and the larger pores provide more space for liquid retention.

[0135] The moisture absorption rates of samples with different densities are shown in the figure. Figure 10 ,Depend on Figure 10 It can be seen that as the pore size of the core II of the test plate increases from 2 mm to 4 mm, the moisture absorption rate of the same sample shows a trend of first increasing and then decreasing. Specifically, when the pore size is 2 mm, 3 mm, and 4 mm, the bulk density is 14 g / cm³. 3The maximum moisture absorption rates of the samples were 80.6 mL / s, 144.0 mL / s, and 111.3 mL / s, respectively. Samples with other bulk densities also showed the same trend. This indicates that the size of the pore size in the core II of the test plate affects the moisture absorption performance of the samples. When the pore size is small, it will limit the absorption rate of the liquid by the sample. When the pore size is large, the gravity of the liquid in contact with the absorption surface increases, which weakens the moisture absorption capacity of the sample.

[0136] The water content of samples with different densities at 120 s is shown in the figure. Figure 11 ,Depend on Figure 11 It can be seen that as the pore size of core II in the test plate increases from 2 mm to 4 mm, the water content of the same sample after 120 s shows a trend of first increasing and then decreasing. Specifically, when the pore size is 2 mm, 3 mm, and 4 mm, the bulk density is 14 g / cm³. 3 The maximum moisture absorption rates of the samples were 2407.1 mg, 3230.2 mg, and 2431.6 mg, respectively, with other samples of different bulk densities showing the same trend. Simultaneously, the changes in water content and the moisture absorption slope showed the same trend. It is evident that the moisture absorption rate is highest when the pore size of core II in the test plate is 3 mm. This indicates that the measured moisture absorption rate and water content changes at this point are closer to the inherent moisture absorption capacity of the sample. A better liquid supply pore size can maximize the accurate evaluation of the sample's performance.

[0137] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A hygroscopicity testing device, characterized in that: The device includes a lifting platform (1), on which a testing device and a columnar material fixing tube (5) are provided. The testing device includes a test plate (2) and a test plate core structure set in the center of the test plate (2). The test plate core structure is located below the columnar material fixing tube (5) and is connected to the liquid reservoir (8) through a liquid guide tube (6). The liquid reservoir (8) is located above the electronic balance (7). The electronic balance (7) is connected to the data acquisition unit (10). The lifting platform (1) has holes on its surface through which the liquid guide tube (6) can pass; The test plate (2) has a diameter greater than 10 cm and a thickness greater than 3 cm. Holes are provided at the center of the upper and lower surfaces of the test plate (2). The depth of the holes is half the thickness of the test plate (2). The diameter of the holes on the test plate (2) is consistent with the outer diameter of the liquid guide tube (6). The test board core structure includes a test board core I (3) and a test board core II (4) with the same outer diameter; the test board core I (3) is annular and 1 mm thick; the test board core II (4) is a disc structure with holes of 2-4 mm in diameter evenly distributed on the disc structure. The columnar material fixing tube (5) is a hollow columnar tube with an outer diameter consistent with the outer diameter of the inner core structure of the test plate; a circular hole is provided above the liquid reservoir (8) for the liquid guide tube (6) to pass through.

2. The hygroscopicity testing device according to claim 1, characterized in that: The test plate (2) has a hole with a diameter of 4±0.02 mm at the center of its lower surface, and the depth of the hole is half the thickness of the test plate (2); the test plate (2) has a hole with a diameter of 15±0.02 mm at the center of its upper surface, and the depth of the hole is half the thickness of the test plate (2).

3. The hygroscopicity testing device according to claim 2, characterized in that: The inner core I (3) of the test board is annular, with an outer diameter of 14±0.02 mm, an inner diameter of 13±0.02 mm, and a thickness of 1 mm; the inner core II (4) of the test board is a porous disc structure with an outer diameter of 14±0.02 mm and holes with a diameter of 3 mm evenly distributed on the inner core II (4).

4. A method for testing and characterizing the hygroscopicity of columnar materials, characterized in that, The test is conducted using the hygroscopicity testing apparatus according to any one of claims 1-3, and the test steps are as follows: 1) Place the columnar material sample in the columnar material fixing tube (5) so that its bottom is connected to the test plate core structure in the hole on the upper surface of the test plate (2). The test plate (2) is connected to the liquid reservoir (8) through the liquid guide tube (6). 2) During the test, the bottom surface of the columnar material sample is higher than the top surface of the liquid in the reservoir (8). During the experiment, the height difference between the two can be maintained by adjusting the height of the lifting platform (1). 3) After adjusting the height of the columnar material sample, the change in liquid in the reservoir (8) is measured by the electronic balance (7) and transmitted to the data acquisition device (10) to record the weight value at the corresponding time. 4) Stop the data acquisition device (10) data recording until the electronic balance reading changes by less than 0.3 mg of liquid within 5 seconds during the absorption process, remove the sample, and the single test ends. Repeat several times, record the data, draw the moisture absorption process curve, and calculate the absorption rate of the columnar material sample. In step 2), the height of the bottom surface of the columnar material sample is 3 ± 1 mm higher than the height of the top surface of the liquid in the reservoir (8).

5. The application of the test characterization method according to claim 4 in detecting the hygroscopicity of vertically placed columnar materials.

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