Sample preparation tool for measuring crosslinking degree of EVA (Ethylene Vinyl Acetate) adhesive film by chemical method

Abstract

The utility model discloses a sample preparation tool for measuring the crosslinking degree of an EVA (Ethylene Vinyl Acetate) adhesive film by a chemical method. The plurality of cutting tools are arranged on the base plate and are used for cutting a plurality of holes in the EVA adhesive film, so that the EVA adhesive film with the plurality of holes is formed; the supporting plate is used for bearing the EVA adhesive film during cutting; the device comprises a support plate and a collecting tank, the support plate is arranged on the collecting tank, the collecting tank is used for collecting waste materials generated after holes are cut, and the EVA adhesive film with a plurality of holes is used as a test sample for testing the crosslinking degree of the EVA adhesive film by a chemical method. The sample preparation tool designed by the utility model can be used for rapidly cutting holes in an EVA (Ethylene Vinyl Acetate) adhesive film, so that the sample preparation speed is greatly increased, the efficiency is improved, an iron wire mesh bag with a large mesh number is not needed, the cost is saved, and meanwhile, a test sample can be in full contact with xylene extract liquor and can be extracted more completely; therefore, the accuracy of test results is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic adhesive films, in particular to a sample preparation tool used for measuring the cross-linking degree of EVA adhesive films by a chemical method. Background Art

[0002] The xylene extraction principle of the chemical crosslinking method is based on the fact that when EVA film is subjected to heat and pressure under certain conditions, the crosslinking agent decomposes and produces free radicals, which trigger the linear molecules of the EVA film to combine to form a three-dimensional network structure, resulting in crosslinking and curing of the EVA film. Crosslinked EVA film is insoluble in xylene, while uncrosslinked EVA film is soluble in xylene.

[0003] Therefore, by using a boiling xylene solution to extract the uncrosslinked EVA film in the sample, the remaining part is the crosslinked EVA film. By calculating the weight difference between the sample before and after extraction, the crosslinking degree of the EVA film can be calculated. Therefore, in order to accurately calculate the crosslinking degree of EVA film using the chemical crosslinking method, the chemical test sample preparation of the EVA film is particularly important. The smaller the sample, the more complete its contact with the xylene extract, and the more complete reaction it can undergo within the experimental time, thus obtaining a more accurate result of the crosslinking degree calculation of the EVA film. Currently, the traditional method for preparing EVA film test samples is to cut the EVA film into particles of approximately 1*1mm in size using scissors, then place the cut EVA film particles into a wire mesh bag, and then place it into a boiling xylene solution for extraction. However, the cutting method is time-consuming and inefficient, and requires the use of high-mesh wire mesh, which is relatively expensive. At the same time, the sample preparation range is difficult to control, and uneven sample preparation will also affect the accuracy of the experimental results. Utility Model Content

[0004] The purpose of the utility model is to design a sample preparation tool for chemically measuring the cross-linking degree of EVA film, thereby solving the problems that the sample preparation for the current EVA film cross-linking degree test is time-consuming, inefficient, costly, and uneven sample preparation easily affects the accuracy of the test results.

[0005] In order to achieve the above-mentioned purpose, the present invention is realized through the following technical solutions:

[0006] The utility model designs a sample preparation tool for measuring the crosslinking degree of EVA film by chemical method, and the sample preparation tool comprises:

[0007] substrate;

[0008] A plurality of cutting tools are provided on the substrate for cutting a plurality of holes on the EVA film, thereby forming an EVA film having a plurality of holes;

[0009] A support plate, used for supporting the EVA film during cutting;

[0010] And a collecting trough, the support plate is arranged on the collecting trough, the collecting trough is used to collect waste generated after cutting holes, and the EVA film with several holes is used as a test sample for measuring the cross-linking degree of the EVA film by chemical method.

[0011] Furthermore, a sample preparation tool for measuring the cross-linking degree of EVA film by a chemical method: a plurality of cutting tools are arranged in a matrix on the substrate.

[0012] Furthermore, a sample preparation tool for chemically measuring the cross-linking degree of EVA film: the shape of the cutting tool is set to be one of a cylindrical shape, an elliptical cylindrical shape, and a rectangular parallelepiped shape.

[0013] Furthermore, a sample preparation tool for chemically measuring the crosslinking degree of EVA film: the area of ​​a single hole is 1.0 to 4.0 mm 2 .

[0014] Furthermore, a sample preparation tool for measuring the cross-linking degree of EVA film by a chemical method: the total area of ​​the plurality of holes is 40 to 70% of the area of ​​the EVA film.

[0015] Beneficial effects of the utility model:

[0016] The existing method is to cut the EVA film into particles of about 1*1mm in size, then place these particles in a wire mesh bag with a larger mesh size, and then place them in a boiling xylene solution for extraction. This will have the problems of high cost of the large-mesh wire mesh bags, long sample preparation time and low efficiency. More importantly, placing these cut EVA film small particles in the wire mesh bag will cause the problem of stacking between the particles, resulting in insufficient contact between the particles and the xylene extract, thereby affecting the cross-linking test results. The sample preparation tool designed by the present invention can quickly cut holes in the EVA film, greatly improving the sample preparation speed and efficiency. At the same time, the EVA film with holes can be used as a test sample and can be directly placed in a boiling xylene solution for extraction or placed in a wire mesh bag with a smaller mesh number and then placed in a boiling xylene solution for extraction. On the one hand, this can enable the EVA film to be in more sufficient contact with the xylene solution, ensuring the accuracy of the test results. On the other hand, there is no need to use a wire mesh bag with a larger mesh number, which saves costs. At the same time, as the mesh number of the wire mesh bag decreases, the mesh becomes larger, which can also enable the test sample to be in more sufficient contact with the xylene extract and the extraction to be more complete, thereby ensuring the accuracy of the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. 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 work.

[0018] Figure 1 A schematic structural diagram of a sample preparation tool designed for chemically measuring the crosslinking degree of EVA film according to Example 1 of the present utility model;

[0019] Figure 2 Schematic diagram of the assembly of the cutting tool and the substrate in Example 1;

[0020] Figure 3 Schematic diagram of the EVA film after being cut by the sample preparation tool of Example 1, that is, a schematic diagram of the structure of the test sample.

[0021] Markings in the figure: 1-substrate, 2-cutting tool, 3-support plate, 4-collecting tank, 5-EVA film, 6-hole. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "top", "bottom", etc., indicating directions or positional relationships, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Moreover, the terms "first", "second", etc. are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein.

[0024] Example 1

[0025] like Figures 1 to 3 As shown, in this embodiment 1, a sample preparation tool for chemically measuring the crosslinking degree of EVA film is designed, and the sample preparation tool includes:

[0026] substrate1;

[0027] A plurality of cutting tools 2 are arranged in a matrix on the substrate 1. These cylindrical cutting tools 2 can cut a plurality of cylindrical holes 6 on the EVA film 5, thereby forming an EVA film 5 with a plurality of holes 6. The area of ​​a single hole 6 is 1.0 to 4.0 mm. 2 , the total area of ​​all holes 6 is 40 to 70% of the area of ​​the EVA film 5;

[0028] A support plate 3, used to support the EVA film 5 during cutting;

[0029] And a collecting tank 4, the support plate 3 is arranged on the collecting tank 4, the collecting tank 4 is used to collect the EVA film waste generated after cutting holes, and the EVA film 5 with several holes 6 is used as a test sample for measuring the cross-linking degree of the EVA film by chemical method.

[0030] When conducting a chemical cross-linking degree test of the EVA film: an EVA film 5 is placed on a support plate 3, and then a plurality of holes 6 are cut on the EVA film by a cutting tool 2 to form an EVA film 5 with a plurality of holes 6, and the hole waste cut by the cutting tool 2 is collected by a collecting tank 4, and the EVA film 5 with holes 6 is used as a test sample for chemically measuring the cross-linking degree of the EVA film, and the test sample is bent and placed in a wire mesh bag with a smaller mesh number and then placed in a boiling xylene solution for extraction. Since the test sample is a whole piece of EVA film with holes, it is not easy to leak in the wire mesh bag, and the mesh number of the mesh bag is small, its cost is low, and the small mesh number of the mesh bag means that the test sample in the mesh bag is more fully in contact with the extraction liquid, the extraction is more complete, and the cross-linking degree test result is more accurate.

[0031] The above preferred embodiments of the present invention are only used to explain the present invention and are not intended to limit the present invention. Any obvious changes or modifications derived from the technical solution of the present invention are still within the scope of protection of the present invention.

Claims

1. A sample preparation tool for chemically measuring the crosslinking degree of EVA film, characterized in that: The sample preparation tool includes: base(1); A plurality of cutting tools (2) are arranged on the substrate (1) and are used to cut a plurality of holes (6) on the EVA film (5); A support plate (3) for supporting the EVA film (5) during cutting; and a collecting trough (4), wherein the support plate (3) is arranged on the collecting trough (4), and the collecting trough (4) is used to collect waste generated after cutting holes, and the EVA film (5) with a plurality of holes (6) is used as a test sample for measuring the cross-linking degree of the EVA film by a chemical method.

2. A sample preparation tool for measuring the crosslinking degree of EVA film by chemical method according to claim 1, characterized in that: A plurality of cutting tools (2) are arranged in a matrix on the substrate (1).

3. A sample preparation tool for measuring the crosslinking degree of EVA film by chemical method according to claim 1 or 2, characterized in that, The shape of the cutting tool (2) is set to be one of a cylindrical shape, an elliptical cylindrical shape, and a rectangular parallelepiped shape.

4. A sample preparation tool for measuring the crosslinking degree of EVA film by chemical method according to claim 1, characterized in that, The area of ​​a single hole (6) is 1.0 to 4.0 mm 2 .

5. A sample preparation tool for measuring the crosslinking degree of EVA film by chemical method according to claim 1 or 4, characterized in that, The total area of ​​the plurality of holes (6) is 40 to 70% of the area of ​​the EVA film (5).

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