Device and method for testing permeability of liquid substance

Abstract

The invention relates to the technical field of material performance testing, in particular to a liquid substance permeability testing device and a liquid substance permeability testing method. The device comprises a heat conduction limiting sleeve, a permeated sheet, an anti-seepage layer and a heat conduction plane layer which are sequentially arranged in a stacked mode. The permeated sheet is laid at the bottom of the heat-conducting limiting sleeve; the impermeable layer is laid at the bottom of the permeated sheet; the heat conduction plane layer is laid at the bottom of the impermeable layer. Different from measurement of a single physical parameter, the testing device is used for evaluating the permeability, the permeability of a specific material can be relatively and comprehensively reflected by the simplest data, factors of viscosity, surface tension, fluidity, temperature and the like of a liquid substance are comprehensively considered, and the method for evaluating the permeability of the specific material by using a simple method is realized. And a complex multi-factor evaluation standard is tested.

Description

Technical Field

[0001] This invention relates to the field of material performance testing technology, specifically to a device and method for testing the permeability of liquid substances. Background Technology

[0002] The permeability of liquid substances (such as composite materials containing resins, curing agents, and fillers) to specific materials is a key indicator for evaluating their application effectiveness, directly affecting the bonding and sealing properties of the materials. Therefore, evaluating the wetting and permeation capabilities of liquid substances is crucial for fields such as composite material manufacturing, electronic packaging, and textile printing and dyeing. Currently, indirect evaluation is often achieved by measuring single physical parameters such as viscosity, surface tension, or flowability. However, this method cannot directly assess the permeability of liquid substances to relative materials and has certain limitations.

[0003] On the one hand, viscosity cannot directly reflect the permeability of a liquid substance to a specific material; viscosity and permeability are not entirely equivalent. On the other hand, surface tension is related to the material being permeated, capillary action affects permeation, and the composition of the mixture, such as fillers and defoamers, can also influence the final permeation result. Furthermore, tests on the flowability of coatings or concrete only consider the effects of gravity or pressure, neglecting the surface tension between the liquid mixture and the material being permeated. Chinese invention patent CN108051350A provides a porous material permeability testing device including a liquid supply module, a sample testing module, and a data acquisition module. Results are collected by a data acquisition instrument and transmitted to a computer, which automatically calculates the test results using a predetermined program. The results are displayed intuitively and conveniently. However, tests for the permeability of liquid substances are currently lacking.

[0004] Therefore, there is an urgent need in this field for a testing method that can more directly and comprehensively simulate actual conditions and quantify the permeability of liquid substances. Summary of the Invention

[0005] To address the problems in the prior art, the first aspect of the present invention provides a device for testing the permeability of liquid substances. The device includes a thermally conductive limiting sleeve, a permeable sheet, a seepage-proof layer, and a thermally conductive planar layer stacked sequentially. The permeable sheet is laid at the bottom of the thermally conductive limiting sleeve. The seepage-proof layer is laid at the bottom of the permeable sheet. The thermally conductive planar layer is laid at the bottom of the seepage-proof layer.

[0006] In one embodiment, the inner diameter of the thermally conductive limiting sleeve is 50-54 mm, and the height is not less than 10 mm.

[0007] In one embodiment, the inner diameter of the thermally conductive limiting sleeve is 51-53 mm, and the height is not less than 10 mm.

[0008] In one embodiment, the material of the permeated sheet is any one of glass fiber cloth, non-woven fabric, nylon cloth, metal mesh, or paper, with a thickness of 0.5-2 mm. Further options include 0.9-1.2 mm. Examples include 0.9 mm, 1.0 mm, 1.1 mm, and 1.2 mm.

[0009] In one embodiment, the impermeable layer is heat-resistant cellophane or other smooth, heat-resistant film that is impermeable to liquid substances, with a thickness of 0.02-0.04 mm. Examples include 0.02 mm, 0.03 mm, and 0.04 mm.

[0010] In one embodiment, the thermally conductive planar layer is a metal plate with a thickness of 0.4-0.7 mm. Examples include 0.4 mm, 0.5 mm, 0.6 mm, and 0.7 mm.

[0011] A second aspect of the present invention provides a method for testing the permeability of a liquid substance, the method employing a permeability testing device for the liquid substance, and the method comprising the following steps:

[0012] S1. Place the test device and the liquid substance to be tested in a constant temperature environment to preheat to the set temperature and maintain it for a first predetermined time.

[0013] S2. Take a quantitative amount of the preheated liquid substance to be tested and add it into the thermally conductive limiting sleeve; transfer the testing device with the added liquid substance to an oven and keep it for a second predetermined time.

[0014] S3. Take out the test device, remove the thermally conductive limiting sleeve, measure the diagonal diameter of the penetration mark formed by the liquid substance on the penetrated sheet within a third predetermined time, and calculate its average value.

[0015] S4. Subtract the inner diameter of the thermally conductive limiting sleeve from the average value obtained in step S3 to obtain the permeability value of the liquid substance to be tested.

[0016] In one embodiment, the temperature is set to 30-100°C in step S1.

[0017] In one embodiment, both the first predetermined time and the second predetermined time are 10-20 minutes.

[0018] In one embodiment, both the first predetermined time and the second predetermined time are 13-17 minutes. Further, 15 minutes may be used.

[0019] In one embodiment, the quantitative amount of the liquid substance to be tested in step S2 is 10±0.2g or 10±0.2mL.

[0020] In one embodiment, the third predetermined time in step S3 is 1-1.5 min.

[0021] In one embodiment, the third predetermined time in step S3 is 1-1.1 min. It can also be 1 min.

[0022] Beneficial effects

[0023] 1. Unlike measuring a single physical parameter, this device can comprehensively reflect the permeability of liquid substances to materials with the simplest data. It takes into account factors such as viscosity, surface tension, fluidity, and temperature of the liquid substance, and achieves the testing of complex multi-factor evaluation criteria with a simple method.

[0024] 2. The liquid substance permeability testing device provided by the present invention has a simple structure, but effectively simulates the actual scenario of liquid permeating into porous materials in a confined space.

[0025] 3. By limiting the size of the thermally conductive limiting sleeve, sample volume, time, temperature, and permeation sheet material, this invention can fairly compare the permeability differences of liquid substances with different formulations, or compare the permeability of the same liquid to different materials.

[0026] 4. This invention can screen different liquid substances based on their relative permeability to a specific material. Conversely, it can also screen for a given liquid raw material to identify easily permeable materials or materials that are difficult to permeate. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the exploded structure of the permeability testing device.

[0028] Figure 2 This is a schematic diagram of the assembly of the permeability testing device.

[0029] In the diagram, 1 is the thermally conductive limiting sleeve; 2 is the permeable sheet; 3 is the impermeable layer; and 4 is the thermally conductive planar layer. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Experimental methods not specifying specific conditions in the embodiments were performed under conventional conditions or conditions recommended by the manufacturer. Reagents or instruments whose manufacturers are not specified are all commercially available conventional products.

[0031] Example

[0032] The first aspect of this embodiment provides a device for testing the permeability of liquid substances, such as... Figure 1 As shown, the device includes a thermally conductive limiting sleeve 1, a permeable sheet 2, an impermeable layer 3, and a thermally conductive planar layer 4, which are stacked sequentially from top to bottom.

[0033] The thermally conductive limiting sleeve is used to contain the liquid substance to be tested;

[0034] The permeated sheet is laid at the bottom of the thermally conductive limiting sleeve;

[0035] The impermeable layer is laid at the bottom of the permeable sheet to prevent leakage of liquid substances;

[0036] The thermally conductive planar layer is laid at the bottom of the impermeable layer to support the entire device and ensure uniform heating.

[0037] The inner diameter of the thermally conductive limiting sleeve is 52mm and the height is 10mm.

[0038] The material of the permeated sheet is fiberglass cloth with a thickness of 1mm.

[0039] The impermeable layer is heat-resistant glassine paper with a thickness of 0.03 mm.

[0040] The thermally conductive planar layer is a metal plate with a thickness of 0.5 mm.

[0041] The second aspect of this embodiment provides a method for testing the permeability of a liquid substance. The method employs a permeability testing device for the liquid substance and includes the following steps:

[0042] S1. Place the testing device and the liquid substance to be tested in a constant temperature environment to preheat to the set temperature and maintain it for 15 minutes;

[0043] S2. Take 10g of the preheated liquid substance to be tested and add it into the thermally conductive limiting sleeve; transfer the test device with the liquid substance to be tested into an oven and keep it for 15 minutes.

[0044] S3. Take out the test device, remove the thermally conductive limiting sleeve, measure the diagonal diameter of the penetration stain formed by the liquid substance on the penetrated sheet within 1 minute, and calculate its average value.

[0045] S4. Subtract the inner diameter of the thermally conductive limiting sleeve from the average value obtained in step S3 to obtain the permeability value of the liquid substance to be tested.

[0046] Performance testing

[0047] The liquid material used in the following tests consisted of: 40% by mass of epoxy resin and anhydride curing agent (mass ratio 100:80), and 40-60% by mass of filler (silica powder). Unless otherwise specified, the test temperature was 80℃.

[0048] The various liquid substances are prepared by mixing raw materials, and the information of each raw material is shown in the table below:

[0049]

[0050]

[0051] (1) Comparison of different viscosities and permeability of liquid substances. The composition of each liquid substance is shown in Table 1 below, and the test results are shown in Table 2:

[0052] Table 1

[0053]

[0054] Table 2

[0055]

[0056] As can be seen from the data in Table 2, under different viscosities, the viscosity and permeability are not linearly related for the permeable material, and the permeability cannot be indirectly evaluated by using a single physical parameter that measures viscosity.

[0057] (2) Surface tension test and permeability comparison: The composition of each liquid substance is shown in Table 3 below, and the test results are shown in Table 4.

[0058] Table 3

[0059]

[0060] Table 4

[0061]

[0062] As can be seen from the data in Table 4, surface tension and permeability are not linearly related, and permeability cannot be indirectly evaluated by measuring surface tension as a single physical parameter.

[0063] (3) Comparison of fluidity and permeability: The composition of each liquid substance is shown in Table 5 below, and the test results are shown in Table 6.

[0064] Table 5

[0065]

[0066] Table 6

[0067]

[0068]

[0069] As can be seen from the data in Table 6, there is no linear relationship between fluidity and permeability, and permeability cannot be indirectly evaluated using this single physical parameter of fluidity measurement.

[0070] (4) Repeatability testing of the test method:

[0071] The test method of this application was used to repeatedly test the same liquid substance three times, and the permeability values ​​were recorded three times. The composition of each liquid substance is shown in Table 7 below, and the test results are shown in Table 8:

[0072] Table 7

[0073]

[0074] Table 8

[0075] First test results Second test results Third test results Liquid substance 17 24.5mm 23.5mm 23mm Liquid substance 18 13.5mm 14mm 15.5mm

[0076] As can be seen from Table 8, the permeability testing method provided in this application has small error in the three test results and good repeatability.

Claims

1. A device for testing the permeability of a liquid substance, characterized in that, The device includes a thermally conductive limiting sleeve, a permeable sheet, a seepage-proof layer, and a thermally conductive planar layer stacked sequentially; the permeable sheet is laid at the bottom of the thermally conductive limiting sleeve; the seepage-proof layer is laid at the bottom of the permeable sheet; and the thermally conductive planar layer is laid at the bottom of the seepage-proof layer.

2. The apparatus for testing the permeability of liquid substances according to claim 1, characterized in that, The inner diameter of the thermally conductive limiting sleeve is 50-54mm, and the height is not less than 10mm.

3. The apparatus for testing the permeability of liquid substances according to claim 1, characterized in that, The material of the permeated sheet is any one of glass fiber cloth, non-woven fabric, nylon cloth, metal mesh or paper, and the thickness is 0.5-2mm.

4. The apparatus for testing the permeability of liquid substances according to claim 1, characterized in that, The impermeable layer is heat-resistant cellophane or other flat, heat-resistant film that is not permeable by liquid substances, with a thickness of 0.02-0.04 mm.

5. The apparatus for testing the permeability of liquid substances according to claim 1, characterized in that, The heat-conducting planar layer is a metal plate with a thickness of 0.4-0.7 mm.

6. A method for testing the permeability of a liquid substance, characterized in that, The test method uses the liquid substance permeability testing device according to any one of claims 1-5, and the test method includes the following steps: S1. Place the test device and the liquid substance to be tested in a constant temperature environment to preheat to the set temperature and maintain it for a first predetermined time. S2. Take a quantitative amount of the preheated liquid substance to be tested and add it into the thermally conductive limiting sleeve; transfer the testing device with the added liquid substance to an oven and keep it for a second predetermined time. S3. Take out the test device, remove the thermally conductive limiting sleeve, measure the diagonal diameter of the penetration mark formed by the liquid substance on the penetrated sheet within a third predetermined time, and calculate its average value. S4. Subtract the inner diameter of the thermally conductive limiting sleeve from the average value obtained in step S3 to obtain the permeability value of the liquid substance to be tested.

7. The permeability testing method according to claim 6, characterized in that, The temperature is set to 30-100℃ in step S1.

8. The permeability testing method according to claim 6, characterized in that, The first and second predetermined times are both 10-20 minutes.

9. The permeability testing method according to claim 6, characterized in that, In step S2, the quantitative amount of the liquid substance to be tested is 10±0.2g or 10±0.2mL.

10. The permeability testing method according to claim 6, characterized in that, The third predetermined time in step S3 is 1-1.5 min.

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