A structure for testing water vapor permeability of a coating

Abstract

The utility model discloses a structure for testing coating water vapor permeability, the utility model discloses a bottom plate is provided with the bearing ring in the top of bottom plate, is provided with the first sealing ring between bottom plate and bearing ring, is provided with the combination ring in the top of bearing ring, is provided with the second sealing washer below combination ring. The utility model provides a kind of for testing coating water vapor permeability device, and structure design is reasonable, easy to operate, can be directly reflected by the weight change caused by water vapor permeation water vapor permeation performance of coating. The device is strong in sealing, suitable for long time, stable test under constant temperature and dry environment, with good repeatability and reliability, especially suitable for performance screening and comparison of various coating film materials under laboratory conditions.

Description

Technical Field

[0001] This utility model belongs to the field of coating water vapor permeability testing, specifically, it relates to a structure for testing the water vapor permeability of coatings. Background Technology

[0002] With the development of functional materials technology, coatings are increasingly widely used in various products, especially in packaging moisture protection, building waterproofing, electronic device protection, and industrial corrosion protection. Their performance directly affects the product's lifespan and reliability. The water vapor barrier capacity of a coating, as an important indicator of its moisture-proof performance, has become one of the key technical parameters in materials research and development and application evaluation. In existing technologies, water vapor transmission rate testing typically relies on sophisticated testing instruments, such as infrared moisture permeability meters and gravimetric testing systems. These devices are complex in structure, expensive, have long testing cycles, cumbersome operating procedures, and high requirements for environmental conditions and sample size. They are difficult to meet the testing needs of university laboratories, small and medium-sized enterprises, or rapid screening scenarios that require simple operation, controllable cost, and high repeatability.

[0003] In view of this, this utility model is proposed. Utility Model Content

[0004] The technical problem to be solved by this invention is to overcome the shortcomings of the prior art and provide a structure for testing the water vapor permeability of coatings, thus solving the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by this utility model is as follows:

[0006] A structure for testing the water vapor permeability of a coating includes: a base plate, a support ring disposed above the base plate, a first sealing ring disposed between the base plate and the support ring, a combined ring disposed above the support ring, a second sealing gasket disposed below the combined ring, and a coating free membrane disposed below the second sealing gasket.

[0007] Several through holes are provided between the base plate and the combined ring. Bolts are inserted into the through holes. The bolts pass through the combined ring from the base plate, and the upper end of the bolts is threaded to a nut that contacts the top of the combined ring.

[0008] Optionally, both the base and the assembly ring are made of transparent resin and are 5mm thick.

[0009] Optionally, the thickness of the bearing ring is 20 mm.

[0010] Optionally, the hollow structure of the composite ring is the same as the hollow structure of the load-bearing ring.

[0011] Optionally, the diameter of the coating free film is greater than the inner diameter of the second transparent substrate and smaller than the outer diameter of the first transparent substrate.

[0012] Optionally, both the first sealing ring and the second sealing gasket are rubber gaskets with a thickness of 2mm.

[0013] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art. Of course, any product implementing the present invention does not necessarily need to achieve all of the following advantages at the same time:

[0014] This invention provides a device for testing the water vapor permeability of coatings. It features a reasonable structural design, simple operation, and can directly reflect the water vapor permeability performance of the coating through the weight change caused by water vapor permeation. The device has strong sealing properties and is suitable for long-term, stable testing in a constant temperature and dry environment. It exhibits good repeatability and reliability, and is particularly suitable for performance screening and comparison of various coating membrane materials under laboratory conditions.

[0015] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings. Attached Figure Description

[0016] The accompanying drawings described below are merely some embodiments. Those skilled in the art can obtain other drawings based on these drawings without any creative effort. In the drawings:

[0017] Figure 1 One of the schematic diagrams of a three-dimensional structure for water vapor permeability;

[0018] Figure 2 The second schematic diagram of a three-dimensional structure for water vapor permeability;

[0019] Figure 3 This is a schematic diagram of the internal three-dimensional structure of a water vapor permeable structure.

[0020] The attached diagram lists the components represented by each number as follows:

[0021] 1. Base plate; 2. Bearing ring; 3. First sealing ring; 4. Combination ring; 5. Coated free film; 7. Second sealing gasket; 8. Through hole; 9. Bolt; 10. Nut.

[0022] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the present invention in any way, but rather to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to the accompanying drawings.

[0024] Please see Figure 1-3 As shown, this embodiment provides a structure for testing the water vapor permeability of a coating, including a base plate 1, a support ring 2 disposed above the base plate 1, a first sealing ring 3 disposed between the base plate 1 and the support ring 2, a combined ring 4 disposed above the support ring 2, a second sealing gasket 7 disposed below the combined ring 4, and a coating free membrane 5 disposed below the second sealing gasket 7.

[0025] Several through holes 8 are provided between the base plate 1 and the combined ring 4. Bolts 9 are inserted into the through holes 8, passing through the combined ring 4 from the base plate 1. The upper end of the bolts 9 is threaded and connected to a nut 10 that contacts the top of the combined ring 4. The combination of the base plate 1, the bearing ring 2, the sealing gasket, the coated free membrane 5, and the combined ring 4 forms a stable and sealed test chamber. The through connection of the bolts 9 makes the device structure firm and reliable, effectively preventing water vapor leakage, ensuring good environmental sealing during the test, and making the test data more accurate. It also facilitates the disassembly and replacement of the test membrane, enhancing the practicality and reusability of the device.

[0026] In this embodiment, both the base and the combined ring 4 are made of transparent resin, and both are 5mm thick. The use of transparent resin for both the base and the combined ring 4 facilitates observation of the membrane's condition and internal water level changes, while also providing sufficient strength and corrosion resistance to withstand long-term use in experimental environments. The 5mm thickness ensures structural stability, preventing deformation during bolt 9 tightening, thereby improving the device's sealing and durability.

[0027] In this embodiment, the thickness of the support ring 2 is 20mm. The 20mm thickness provides sufficient internal volume to hold the water sample, ensuring adequate space for water vapor evaporation during testing, thus avoiding testing errors caused by insufficient water volume. Simultaneously, this thickness also enhances the mechanical strength of the support ring 2, making it less prone to deformation during assembly and improving overall stability.

[0028] In this embodiment, the hollow structure of the combined ring 4 is the same as that of the carrier ring 2. The identical hollow structure design of the combined ring 4 and the carrier ring 2 allows for a good fit between the upper and lower structures of the device, facilitating assembly and membrane tensioning and fixing. The matching hollow structures also improve the sealing effect of the sealing ring, reduce the risk of leakage, and further enhance the accuracy and stability of the testing process.

[0029] In this embodiment, the diameter of the coating free membrane 5 is larger than the inner diameter of the second transparent substrate and smaller than the outer diameter of the first transparent substrate. By designing the diameter of the coating free membrane 5 to be larger than the inner diameter of the combined ring 4 and smaller than the outer diameter of the base plate 1, it can just cover the bearing cavity and be well clamped by the sealing ring, ensuring the stability of the membrane and facilitating the replacement of membranes of different sizes. This design effectively avoids the problem of membrane edge leakage and ensures sealing and reliability during the testing process.

[0030] In this embodiment, both the first sealing ring 3 and the second sealing gasket 7 are rubber gaskets with a thickness of 2mm. Both the first sealing ring 3 and the second sealing gasket 7 are made of 2mm thick rubber gaskets, which have good elasticity and water resistance, and can effectively fill interface gaps under pressure, enhancing the sealing effect.

[0031] This device seals a chamber filled with deionized water and covers the chamber opening with a free-film coating 5. It is then stored in a constant-temperature, dry environment, allowing water vapor to diffuse outwards only through this film. By periodically weighing the change in the overall mass of the device, the rate of water evaporation can be obtained, thus calculating the water vapor permeability. This permeability directly reflects the coating's ability to block water vapor, enabling an accurate evaluation of the coating's water vapor permeability.

[0032] This utility model is not limited to the above-described embodiments. Anyone should know that structural changes made under the guidance of this utility model, and any technical solutions that are the same as or similar to this utility model, fall within the protection scope of this utility model. Technical aspects, shapes, and structures not described in detail in this utility model are all publicly known technologies.

Claims

1. A structure for testing the water vapor permeability of a coating, characterized in that, include: A base plate (1) is provided above the base plate (1), a bearing ring (2) is provided above the base plate (1), a first sealing ring (3) is provided between the base plate (1) and the bearing ring (2), a combined ring (4) is provided above the bearing ring (2), a second sealing gasket (7) is provided below the combined ring (4), and a coating free membrane (5) is provided below the second sealing gasket (7). Several through holes (8) are provided between the base plate (1) and the combined ring (4). Bolts (9) are inserted into the through holes (8). The bolts (9) pass through the combined ring (4) from the base plate (1). The upper end of the bolts (9) is threaded and connected to a nut (10) that contacts the top of the combined ring (4).

2. The structure for testing the water vapor permeability of a coating according to claim 1, characterized in that, The base and the combination ring (4) are both made of transparent resin and are 5mm thick.

3. The structure for testing the water vapor permeability of a coating according to claim 1, characterized in that, The thickness of the bearing ring (2) is 20 mm.

4. The structure for testing the water vapor permeability of a coating according to claim 1, characterized in that, The hollow structure of the combined ring (4) is the same as the hollow structure of the bearing ring (2).

5. The structure for testing the water vapor permeability of a coating according to claim 1, characterized in that, The diameter of the coating free film (5) is greater than the inner diameter of the second transparent substrate and smaller than the outer diameter of the first transparent substrate.

6. The structure for testing the water vapor permeability of a coating according to claim 1, characterized in that, Both the first sealing ring (3) and the second sealing gasket (7) are rubber gaskets with a thickness of 2mm.

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