Test piece manufacturing device and method capable of accurately controlling the thickness of thermosetting material adhesive layer

Abstract

The present invention discloses a test piece making device and method that can accurately control the thickness of the thermosetting material glue layer. The device includes a plurality of first fixings, a plurality of second fixings and a base; the base is provided with a plurality of first grooves and a second groove; the first fixing and the second fixing both include a first accessory and a second accessory; the first fixing and the second fixing are respectively fixed to the first groove and the second groove, and the epoxy resin material is injected into the gap between the first accessory and the second accessory, and after curing and solidifying, epoxy resin glue layers of different thicknesses can be accurately made, providing qualified test pieces for the dynamic shear rheometer to apply a torsional shear force to the epoxy resin cured glue layer. The present invention can accurately guarantee the thickness of the glue layer, and solves the problem in the prior art that when the dynamic shear rheometer is used to measure the performance of epoxy resin, the thickness of the epoxy resin glue layer cannot be accurately controlled, and thus, it is impossible to provide qualified test pieces for the viscoelastic test of materials such as epoxy resin.

Description

Technical Field

[0001] The invention relates to the field of material test specimen design, and in particular to a specimen manufacturing device and method capable of accurately controlling the thickness of a thermosetting material adhesive layer. Background Art

[0002] In the process of material testing, it is usually necessary to accurately control the thickness of the material for related tests, and it is usually necessary to make ultra-thin test film. For example, the dynamic shear rheology (DSR) test in dynamic mechanical analysis is a technology used to study the viscoelasticity of thermosetting materials such as epoxy resin and the mechanical response of epoxy resin under temperature and external force (Zhang Xiaoning et al. in "Research on the Performance of Epoxy Asphalt Mixture Based on Dynamic Frequency Sweep" (Journal of Huazhong University of Science and Technology (Natural Science Edition) [J], 2009, 37(07): 102-105). It is necessary to make a thinner epoxy resin layer for testing, usually requiring 1mm and 2mm film specimens. Zhang Xinyi et al. invented a tool that can accurately control the thickness of the adhesive layer ([P]. CN208998698U, 2019) for accurately controlling the thickness of the adhesive layer, but the installation and operation of the tool are relatively cumbersome, and the implementation process requires continuous adjustment of the fixture distance of the tool. Li Mei et al. invented a bonding device and method for accurately controlling the thickness of the adhesive layer of the butt joint ([P]. CN107817148A, 2018) to solve the problem that the thickness of the adhesive layer cannot be accurately controlled in the prior art, and thus cannot provide qualified test pieces for the impact strength test of the adhesive. However, during the implementation of the invention, the knob needs to be rotated multiple times to make the bonding surface contact and the vernier caliper needs to be used to control the thickness of the adhesive layer. This process is difficult to operate. Gao Yongtao et al. invented a device for accurately controlling the thickness and uniformity of the adhesive layer ([P]. CN210965746U, 2020) to reduce the thickness of the adhesive layer, thereby reducing the installation space occupied by the large piece when it is used. However, the invention has a complex structure and needs to be fixed with double-sided tape during implementation, which is difficult to operate.

[0003] At present, on the one hand, the structures of the manufacturing devices or tooling that can accurately control the adhesive layer are relatively complex and the operation process is complicated, and there are still relatively few manufacturing devices that can accurately control the thickness of test specimens of thermosetting materials such as epoxy resins; on the other hand, using DSR to test and analyze thermosetting materials such as epoxy resins with different thicknesses is conducive to further understanding the material properties of epoxy resins. Therefore, it is necessary to further develop relevant specimen manufacturing devices that can accurately control the thickness of the adhesive layer of thermosetting materials, which not only meets the requirements of using DSR to perform shear rheological analysis on epoxy resin adhesive layers of different thicknesses, but also meets the development trend and application needs of increasingly miniaturized products. Summary of the invention

[0004] The purpose of this application is to provide a test specimen preparation device and method that can accurately control the thickness of the thermosetting material adhesive layer. The problem solved by this application is to provide epoxy resin adhesive layer test specimens with different thicknesses for dynamic shear tests, to achieve viscoelastic testing of thermosetting epoxy resin cured products, and to facilitate scientific researchers to conduct further research on the viscoelasticity of thermosetting materials such as epoxy resins.

[0005] The purpose of the present invention is achieved by at least one of the following technical solutions.

[0006] A test piece making device capable of accurately controlling the thickness of a thermosetting material adhesive layer comprises a plurality of first fixing members, a plurality of second fixing members and a base; the base is provided with a plurality of first grooves and a second groove; the first fixing member and the second fixing member both comprise a first accessory and a second accessory; the first fixing member and the second fixing member are respectively fixed to the first groove and the second groove of the base, and a thermosetting material is injected into the gap between the first accessory and the second accessory, and after the thermosetting material is cured, adhesive layers of thermosetting material of different thicknesses can be accurately made, so as to provide qualified test pieces for a dynamic shear rheometer to apply a torsional shear force to an epoxy resin cured adhesive layer.

[0007] Furthermore, the base is made of tetrafluoroethylene, the first groove and the second groove on the base are designed side by side, and the base is manufactured by a factory with a unified mold.

[0008] Furthermore, the first fixing member and the second fixing member are both made of stainless steel; the first accessory and the second accessory are a pair of accessories with exactly the same shape and size, and can be manually installed on the base.

[0009] Furthermore, the first accessory and the second accessory both include a fixed end, a connector and a bonding head, the connector connects the fixed end and the bonding head, and epoxy resin material is injected into the gap between the bonding heads of the first accessory and the second accessory; the fixed end is a rectangular parallelepiped, the connector and the bonding head are both cylindrical, and the first accessory and the second accessory are both manufactured by a unified mold in the factory.

[0010] Furthermore, the first groove and the second groove each include a first rectangular groove, a first semi-cylindrical groove, a second semi-cylindrical groove, a third semi-cylindrical groove and a second rectangular groove in sequence; the first rectangular groove and the second rectangular groove are respectively used to place the fixed ends of the first accessory and the second accessory, the first semi-cylindrical groove and the third semi-cylindrical groove are respectively used to place the connecting body of the first accessory and the second accessory, and the second semi-cylindrical groove is used to place the bonding head of the first accessory and the second accessory.

[0011] Furthermore, the first rectangular groove, the first semi-cylindrical groove, the third semi-cylindrical groove and the second rectangular groove of the first groove and the second groove are consistent in shape and size, the radius of the second semi-cylindrical groove of the first groove and the second groove are the same, and the heights are different. After placing the first accessory and the second accessory, the epoxy resin adhesive layer of different thicknesses is produced according to the different gap sizes between the two bonding heads of the first accessory and the second accessory.

[0012] The present invention also provides a method for making the test piece using the test piece making device, comprising the following steps:

[0013] The first step is to place the base on a horizontal table, and then fix the first accessory and the second accessory on the first groove or the second groove of the base at the same time;

[0014] The second step is to prepare an appropriate amount of TAF epoxy resin adhesive according to the test operation specifications;

[0015] The third step is to slowly inject the epoxy resin into the gap between the first accessory and the second accessory using a rubber-tipped straw or syringe. During the operation, the epoxy resin is made uniform and free of bubbles. The epoxy resin is allowed to stand and solidify to form an epoxy resin adhesive layer, which is then bonded and fixed to the first accessory and the second accessory to form a whole, thereby forming a precisely manufactured thermosetting material adhesive layer.

[0016] Furthermore, the thermosetting material is an epoxy resin adhesive layer.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention has a simple structure, a simple manufacturing method, and is reusable, meeting the development trend and application requirements of increasingly miniaturized products. The present invention can form gaps of different sizes between the first and second accessories by fixing the first and second accessories of the first fixing member and the second fixing member on the first groove or the second groove of the base, and inject epoxy resin adhesive into the gap to form epoxy resin adhesive layers of different thicknesses, providing qualified test specimens for applying torsional shear force to the epoxy resin cured adhesive layer using a dynamic shear rheometer, which is conducive to further research by scientific researchers on the viscoelasticity of epoxy resin. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the main view of a test piece manufacturing device which can accurately control the thickness of the thermosetting material adhesive layer.

[0020] Figure 2 It is a left view schematic diagram of a test piece manufacturing device that can accurately control the thickness of the thermosetting material glue layer.

[0021] Figure 3It is a top view schematic diagram of a test piece manufacturing device that can accurately control the thickness of the thermosetting material glue layer.

[0022] Figure 4 The present invention is a top view of a first accessory and a second accessory of a test piece manufacturing device capable of accurately controlling the thickness of a thermosetting material adhesive layer. DETAILED DESCRIPTION

[0023] The specific implementation of the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0024] Example:

[0025] A test piece making device capable of accurately controlling the thickness of a thermosetting material adhesive layer, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, it includes a plurality of first fixing members 12, a plurality of second fixing members 13 and a base 14; the base 14 is provided with a plurality of first grooves and second grooves; the first fixing member 12 and the second fixing member 13 both include a first accessory 1 and a second accessory 2; the first fixing member 12 and the second fixing member 13 are respectively fixed on the first groove and the second groove of the base 14, and the gap formed between the first accessory 1 and the second accessory 2 is injected with epoxy resin material, so that epoxy resin adhesive layers 6 of different thicknesses can be accurately produced.

[0026] The base 14 is made of tetrafluoroethylene. The first groove and the second groove on the base 14 are designed side by side. In this embodiment, there are three first grooves and three second grooves on the base 14 respectively. The base 14 is made by a unified mold in the factory.

[0027] The first fixing member 12 and the second fixing member 13 are both made of stainless steel; the first accessory 1 and the second accessory 2 are a pair of accessories with exactly the same shape and size, and can be manually installed on the base 14.

[0028] The first accessory 1 and the second accessory 2 both include a fixed end 3, a connector 4 and a bonding head 5. The connector 4 connects the fixed end 3 and the bonding head 5 to form the first accessory 1 and the second accessory 2. The gap between the bonding heads 5 of the first accessory 1 and the second accessory 2 is injected with epoxy resin material. In this embodiment, the fixed end 3 is a rectangular parallelepiped of 5mmx5mmx13mm, the connector 4 is a cylinder with a radius of 7mm and a height of 5mm, and the bonding head 5 is a cylinder with a radius of 4mm and a height of 5mm. The first accessory 1 and the second accessory 2 are both manufactured by a unified mold in the factory.

[0029] The first groove and the second groove each include a first rectangular groove 7, a first semi-cylindrical groove 8, a second semi-cylindrical groove, a third semi-cylindrical groove 10 and a second rectangular groove 11 in sequence; the first rectangular groove 7 and the second rectangular groove 11 are respectively used to place the fixed ends 3 of the first accessory 1 and the second accessory 2, the first semi-cylindrical groove 8 and the third semi-cylindrical groove 10 are respectively used to place the connecting body 4 of the first accessory 1 and the second accessory 2, and the second semi-cylindrical groove is used to place the bonding head 5 of the first accessory 1 and the second accessory 2.

[0030] The first rectangular groove 7, the first semi-cylindrical groove 8, the third semi-circular cylindrical groove 10 and the second rectangular groove 11 of the first groove and the second groove are consistent in shape and size; the second semi-cylindrical groove 9-1 of the first groove and the second semi-cylindrical groove 9-2 of the second groove have the same radius but different heights; after placing the first accessory 1 and the second accessory 2, epoxy resin adhesive layers of different thicknesses are produced according to the different gap sizes between the two bonding heads 5 of the first accessory 1 and the second accessory 2.

[0031] In this embodiment, the first rectangular groove 7 is a rectangular parallelepiped of 5mmx5mmx6.5mm, the first semi-cylindrical groove 8 is a semi-cylinder with a radius of 7mm and a height of 5mm, the third semi-cylindrical groove 10 is a semi-cylinder with a radius of 7mm and a height of 5mm, and the second rectangular groove 11 is a rectangular parallelepiped of 5mmx5mmx6.5mm; the second semi-cylindrical groove 9-1 of the first groove is a semi-cylinder with a radius of 4mm and a height of 12mm, and the second semi-cylindrical groove 9-2 of the second groove is a semi-cylinder with a radius of 4mm and a height of 11mm; the first groove is made of a 2mm epoxy resin glue layer, and the second groove is made of a 1mm epoxy resin glue layer.

[0032] The epoxy resin adhesive layer 6 is a thermosetting material. In this embodiment, the epoxy resin adhesive layer 6 is a TAF epoxy resin adhesive.

[0033] In this embodiment, the operating steps of a test piece manufacturing device capable of accurately controlling the thickness of a thermosetting material adhesive layer are as follows:

[0034] In the first step, the base 14 is placed on a horizontal table, and then the first accessory 1 and the second accessory 2 are simultaneously fixed to the first groove or the second groove of the base 14;

[0035] The second step is to prepare a certain amount of TAF epoxy resin adhesive according to the test requirements and the test operation specifications;

[0036] The third step is to absorb a certain amount of epoxy resin through a rubber-tipped straw or syringe, and slowly inject the epoxy resin into the gap between the first accessory 1 and the second accessory 2. During the operation, the epoxy resin should be as uniform and bubble-free as possible, and it is allowed to stand for curing and solidification to form an epoxy resin adhesive layer, and then bonded and fixed to the first accessory 1 and the second accessory 2 to form a whole, so that a 1mm or 2mm epoxy resin adhesive layer can be accurately produced. The dynamic shear rheometer is used to test epoxy resin adhesive layers of different thicknesses, and the temperature scan, frequency scan, and strain scan are tested under different test modes, so as to obtain the mechanical response and related data of epoxy resin adhesive layers of different thicknesses, and provide a basis for evaluating the rheological properties of epoxy resin cured products.

[0037] The above embodiments are only used to illustrate the technical solution of the present invention, rather than to limit it. Although the present application is described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present application can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A test piece manufacturing device capable of accurately controlling the thickness of a thermosetting material adhesive layer, characterized in that: The invention comprises a plurality of first fixing members (12), a plurality of second fixing members (13) and a base (14); the base (14) is provided with a plurality of first grooves and a plurality of second grooves; the first fixing member (12) and the second fixing member (13) both comprise a first accessory (1) and a second accessory (2); the first fixing member (12) and the second fixing member (13) are respectively fixed to the first groove and the second groove of the base (14); a thermosetting material is injected into the gap between the first accessory (1) and the second accessory (2) to accurately produce thermosetting material adhesive layers (6) of different thicknesses; the first fixing member (12) and the second fixing member (13) are both made of stainless steel; the first accessory (1) and the second accessory (2) are a pair of accessories of exactly the same shape and size, and are manually mounted on the base (14); the first accessory (1) and the second accessory (2) both comprise a fixing end (3), a connecting body (4) and a bonding head (5); the connecting body (4) connects the fixing end (3) and the bonding head (5); the first accessory (1) and the second accessory Thermosetting material is injected into the gap between the bonding heads (5) of the first and second fittings (2); the fixed end (3) is a rectangular parallelepiped, the connecting body (4) and the bonding head (5) are both cylindrical, and the first fitting (1) and the second fitting (2) are both uniformly molded and manufactured by the factory; the first groove and the second groove each include a first rectangular parallelepiped groove, a first semi-cylindrical groove, a second semi-cylindrical groove, a third semi-cylindrical groove and a second rectangular parallelepiped groove in sequence; the first rectangular parallelepiped groove and the second rectangular parallelepiped groove are respectively used to place the fixed ends (3) of the first fitting (1) and the second fitting (2), the first semi-cylindrical groove and the third semi-cylindrical groove are respectively used to place the connecting bodies (4) of the first fitting (1) and the second fitting (2), and the second semi-cylindrical groove is used to place the bonding heads (5) of the first fitting (1) and the second fitting (2); the first rectangular parallelepiped groove, the first semi-cylindrical groove, the third semi-cylindrical groove and the second rectangular parallelepiped groove of the first groove and the second groove are of the same shape and size, and the radius of the second semi-cylindrical groove of the first groove and the second groove is the same, but the height is different.

2. The test piece making device capable of accurately controlling the thickness of the thermosetting material adhesive layer according to claim 1 is characterized in that: The base (14) is made of tetrafluoroethylene, and the first groove and the second groove on the base (14) are designed side by side. The base (14) is manufactured by a factory using a unified mold.

3. The test piece making device capable of accurately controlling the thickness of the thermosetting material adhesive layer according to claim 1 is characterized in that: The thermosetting material adhesive layer (6) is an epoxy resin adhesive layer.

4. A method for preparing a test piece using the test piece preparation device capable of accurately controlling the thickness of the thermosetting material adhesive layer according to any one of claims 1 to 3, characterized in that The steps include: The first step is to place the base on a horizontal table, and then fix the first accessory and the second accessory on the first groove or the second groove of the base at the same time; The second step is to prepare an appropriate amount of TAF epoxy resin adhesive according to the test operation specifications; The third step is to absorb the epoxy resin through a rubber-tipped straw or syringe, and slowly inject the epoxy resin into the gap between the first accessory and the second accessory. During the operation, the epoxy resin is evenly distributed and free of bubbles. It is allowed to stand and solidify to form an epoxy resin adhesive layer, and the first accessory and the second accessory are bonded and fixed to form a whole, so that the thermosetting material adhesive layer can be accurately produced.

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