A method and apparatus for testing the water absorption of a porous powder material

Abstract

The application discloses a device for testing water absorption process of porous powder material, which comprises a test container, an upper partition plate, a lower partition plate, a sample bag and a water injection device. The application also discloses a method for testing water absorption process of porous powder material, which comprises testing the initial water content of the porous powder material, the water content after the porous powder material is soaked for a certain time, calculating the water absorption rate of the porous powder material after the porous powder material is soaked for a certain time, and obtaining the water absorption process of the porous powder material through the change of the water absorption rate. The device is simple in operation, accurate and reliable in result, can fully remove the air between the porous powder materials, and prevent the light porous powder materials from floating up. The method is universal for testing the water absorption rate and water absorption process of the porous powder material.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of porous material research, and particularly relates to a method and device for testing the water absorption process of porous powder material. BACKGROUND

[0002] After the material is crushed into ultra-fine powder, due to the fine particle size and narrow distribution, the material has unique properties such as large specific surface area, high surface activity, fast chemical reaction speed, and fast dissolution speed, and is widely used in the fields of electronic information, medicine, pesticide, military, chemical industry, light industry, environmental protection, etc. The porous powder material has unique application fields such as adsorption, loading, and slow release due to the high porosity.

[0003] The water absorption rate of the porous powder material is an important structural performance parameter. In the existing water absorption rate testing method, the mass of the dry porous powder material and the mass of the porous powder material in the saturated surface dry state after being saturated with water need to be tested. For the porous powder material, the powder particles are aggregated due to the large surface tension after the powder is contacted with water, and the particles adsorb a lot of water, so it is difficult to accurately determine the saturated surface dry state, which makes it difficult to test the water absorption rate. Correspondingly, for the porous powder material that absorbs water slowly, it is more difficult to test the water absorption process. CN201610813970 discloses a continuous monitoring device and method for the water absorption process of porous material, but the method is only suitable for block materials. For the powder material, it is difficult to remove the air between the porous powder materials in the static state, and there are problems such as floating, overflowing from the exhaust pipe, etc. for the light porous powder material.

[0004] Therefore, the technical problem to be solved by the present application is to overcome the difficulty that the porous powder material cannot accurately find the saturated surface dry state after being contacted with water in the prior art, to solve the problem of floating of the light porous powder material, and to provide a device and method for testing the water absorption process of porous powder material. SUMMARY

[0005] In order to solve the above problems, the purpose of the present application is to provide a device and method for testing the water absorption process of porous powder material. The device can avoid the problem of floating of the light porous powder material by setting the upper and lower partitions, and can fully remove the air between the porous powder materials through the water feeding process from bottom to top. The method does not need to determine the saturated surface dry state of the porous powder material, and the water absorption rate of the porous powder material at time t can be obtained by calculating through the water content at time t and the initial time.

[0006] The specific technical scheme of the present application is as follows:

[0007] A device for testing the water absorption process of porous powder material, comprising a test container, an upper partition, a lower partition, a sample bag, and a water feeding device.

[0008] The test container is a cylindrical container, provided with a lower water injection hole and an upper water outlet hole;

[0009] The edges of the upper and lower partitions are compressible soft rubber strips, which can be fixed in the test container;

[0010] The mesh size of the sample bag is selected according to the particle size of the porous powder, and the mesh size is smaller than the minimum particle size of the porous powder.

[0011] The inner diameter of the test container is 4-6 cm; the distance between the lower water injection hole and the upper water outlet hole is 8-12 cm.

[0012] A test method for the water absorption process of a porous powder in a porous powder water absorption process test device as described above, comprising the following steps:

[0013] Step 1: Install the lower partition above the water injection hole, weigh the porous powder material and put it into the sample bag above the lower partition, and install the upper partition;

[0014] Step 2: Adjust the water injection device to allow water to flow into the test container for a certain period of time to remove air between the porous powders, and then immediately stop the water flow;

[0015] Step 3: Immediately remove the porous powder sample bag, weigh the weight of the porous powder at this time , dry the sample at 100-105°C to constant weight , calculate the water content of the porous powder at this time ;

[0016] Step 4: Repeat steps 1-2, immediately remove the sample bag after the porous powder is soaked for a certain time interval t, weigh the weight of the porous powder sample at this time , dry the sample at 100-105°C to constant weight , calculate the water content at this time ;

[0017] Step 5: Calculate the water absorption rate of the porous powder sample at time t ;

[0018] Step 6: Process the data to obtain the water absorption process curve of the porous powder material.

[0019] The water flow for a certain period of time in step 2 is 20-30 seconds.

[0020] In step 4, the certain time interval is 10 min, 20 min, 30 min, 1 h, 2 h, 4 h, 6 h, 12 h, or 24 h.

[0021] The beneficial effects of the method compared with the prior art include three aspects.

[0022] The device for testing the water absorption process of porous powder material provided by the application comprises a water injection device, and air between the porous powder materials can be fully removed by the method of water flowing from bottom to top under a certain pressure, so as to avoid the interference of the air on the test results.

[0023] The device for testing the water absorption process of porous powder material provided by the application comprises upper and lower partitions, so that the floating and overflow of light porous powder materials can be avoided, and the porous powder materials can be fully contacted with water. The method for testing the water absorption process of porous powder material provided by the application solves the problem that it is difficult to find the saturated surface dry state of the porous powder material.

[0024] The device and method for testing the water absorption process of porous powder material provided by the application are universal for testing the water absorption rate and water absorption process of porous powder material. A large number of tests show that the method is suitable for porous powder materials with different particle sizes and pore structures. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the application, the drawings required to be used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only for example, and for those skilled in the art, other embodiments can also be obtained from the drawings provided by the application without creative labor.

[0026] The structures, proportions, sizes and the like shown in the specification are only used to cooperate with the content disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the limiting conditions of the embodiments of the application. Any modification, change or size adjustment of the structure, which does not affect the effects and purposes of the application, should be within the scope of the technical content disclosed by the application.

[0027] Figure 1 An example of the device for testing the water absorption process of porous powder material provided by the application is given, wherein (1) a test container; (2) an upper partition; (3) a lower partition; (4) a sample bag; (5) a water injection hole; and (6) a water outlet hole.

[0028] Figure 2 A porous microsphere water absorption process curve of a preferred embodiment of the application is exemplarily given. EMBODIMENT

[0029] The following examples are provided to better further understand the application, and do not limit the content and protection scope of the application. Any person who obtains any product same or similar to the application under the inspiration of the application or by combining the application with other prior art features falls within the protection scope of the application.

[0030] The application will be further described in detail below in conjunction with the embodiments and drawings.

[0031] A device for testing water absorption process of porous powder material, which is composed of a test container, an upper partition plate, a lower partition plate, a sample bag and a water injection device. The test container is a cylindrical container with an inner diameter of 6 cm, provided with a lower water injection hole and an upper water outlet hole, and the distance between the lower water injection hole and the upper water outlet hole is 12 cm. The edges of the upper partition plate and the lower partition plate are compressible soft rubber strips that can be fixed in the test container. The minimum pore size of the sample bag is 100 μm.

[0032] Porous microbead sample: porous microbeads with a particle size range of 100-300 μm are dried to constant weight in a 105°C air drying oven, and then cooled to room temperature for dry storage.

[0033] The water absorption process of porous microbeads is tested using the above device, including the following steps:

[0034] Step 1: Install the lower partition plate to the position 1 cm above the water injection hole, weigh the porous microbeads and put them into the sample bag, place the sample bag above the lower partition plate, and install the upper partition plate.

[0035] Step 2: Adjust the water injection device to allow water to flow into the test container for 30 seconds to remove air between the porous microbeads, and then immediately stop the water flow.

[0036] Step 3: Immediately remove the porous microbead sample bag, weigh the weight of the porous microbeads at this time , dry the porous microbead sample to constant weight at 100-105°C , calculate the water content of the porous microbeads at this time ;

[0037] Step 4: Repeat steps 1-2, after the porous microbeads are soaked for t hours (6h, 12h, 18h, 24h……), immediately remove the porous microbead sample bag, weigh the weight of the porous microbead sample at this time , dry the porous microbead sample to constant weight at 100-105°C , calculate the water content at this time ;

[0038] Step 5: Calculate the water absorption rate of the porous microbead sample at time t ;

[0039] Step 6: Process the data to obtain the water absorption process curve of the porous microbeads, as shown in Figure 2 .

[0040] As can be seen from Figure 2 , the porous microbeads complete the water absorption process within 72 hours and reach a saturated state, with a water absorption rate of 50%.

[0041] Obviously, the above-mentioned embodiments are only examples for clearly illustrating the present application, but not limitation to the embodiments. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, it is not necessary and also impossible to enumerate all the embodiments. The obvious changes or variations derived from the above description are still within the protection scope of the present application.

Claims

1. A method of testing the water absorption process of a porous powder material, characterized in that, The application discloses a testing device for water absorption process of porous powder material, which is composed of a testing container, an upper partition plate, a lower partition plate, a sample bag and a water injection device. The testing container is a cylindrical container with a lower water injection hole and an upper water outlet hole. The edges of the upper and lower partition plates are made of compressible soft rubber strips, which can be fixed in the testing container. The mesh number of the sample bag is selected according to the particle size of the porous powder, and the mesh size is smaller than the minimum particle size of the porous powder. The testing method for water absorption process of porous powder material comprises the following steps: Step 1: install the lower partition plate above the water injection hole, weigh the porous powder material and put it into the sample bag above the lower partition plate, and then install the upper partition plate; Step 2: adjust the water injection device to make the testing container be watered for a certain time, so as to remove the air between the porous powders, and then stop watering immediately; Step 3: Immediately take out the sample bag of porous powder, weigh the weight of the porous powder at this time Ml, dry the sample at 100-105°C to constant weight M2, and calculate the water content of the porous powder at this time Step 4: Repeat Step 1 to Step 2, immediately take out the sample bag after the porous powder is soaked for a certain time interval t, weigh the weight m1 of the porous powder sample at this time, dry the sample at 100-105°C to a constant weight m2, and calculate the water content at this time Step 5: Calculate the water absorption X of the porous powder sample at time t t - X0; Step 6: process the data to obtain the water absorption process curve of the porous powder material.

2. The method of claim 1, wherein the porous powder material is a water-absorbing process, characterized in that, The inner diameter of the testing container is 4-6 cm, and the distance between the lower water injection hole and the upper water outlet hole is 8-12 cm.

3. The method of claim 1, wherein the porous powder material is a water-absorbing process, characterized in that, The certain time in step 2 is 20-30 seconds.

4. The method of claim 1, wherein the porous powder material is a water-absorbing process, characterized in that, The certain time interval in step 4 is 10 min, 20 min, 30 min, 1 h, 2 h, 4 h, 6 h, 12 h or 24 h.

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