Method of recycling a composite rheology test fixture

Abstract

This application relates to a method for recycling a composite material rheology testing fixture. The method does not use chemical decomposition agents and includes: placing the fixture with composite resin residue adhering to its surface in a heating device; heating the fixture to a target temperature and maintaining it for a target time in an oxygen-containing atmosphere, causing the composite resin residue to undergo thermal decomposition and thermal oxidation reactions and mineralization, generating gaseous products and inorganic residues. The gaseous products escape from the fixture surface. The target temperature is 480℃-520℃, and the target time is 1.5h-2.5h; cooling the fixture to a first preset temperature and removing it from the heating device; and physically removing the inorganic residues from the fixture to obtain the target fixture. This method avoids the use of chemical decomposition agents, thus preventing corrosion of the fixture; the inorganic residues have low bonding strength with the fixture and can be removed physically, ensuring thorough cleaning and thus guaranteeing the accuracy of subsequent test data.

Description

Technical Field

[0001] This application relates to the field of composite material testing tool recycling technology, and in particular to a method for recycling composite material rheological testing fixtures. Background Technology

[0002] In the research and development and quality control of composite materials, rheometers are core equipment for characterizing key process parameters such as resin matrix viscosity and curing behavior. Among these, the test fixture, as a critical component in rheological testing, directly impacts the accuracy of the test data due to its surface condition. After isothermal or dynamic scanning curing tests, the resin often undergoes cross-linking and curing on the fixture surface, forming a chemically stable and highly adhesive contamination layer that severely affects the reliability of subsequent tests.

[0003] In related technologies, scraping, solvent immersion, and ultrasonic cleaning are the main methods used to remove the contaminant layer. However, scraping can easily damage the high-gloss surface of the fixture, and most chemical solvents are ineffective at cleaning contaminants, resulting in contaminants remaining on the fixture surface, affecting testing accuracy and efficiency. Furthermore, frequent fixture replacements are required, significantly increasing the R&D cost of composite materials. Summary of the Invention

[0004] To overcome the problems existing in related technologies, this application provides a method for recycling composite material rheological testing fixtures.

[0005] This application provides a method for recycling a composite material rheological testing fixture, wherein the method does not add a chemical decomposition agent and includes: A clamp with resin residue adhering to its surface is placed in a heating device; Under an oxygen-containing atmosphere, the fixture is heated to a target temperature and maintained for a target time, causing the composite resin residue to undergo thermal decomposition and thermal oxidation reactions and mineralization, generating gaseous products and inorganic residues. The gaseous products escape from the surface of the fixture. The target temperature is 480℃-520℃, and the target time is 1.5h-2.5h. After the clamp is cooled to a first preset temperature, it is removed from the heating device; The inorganic residue is removed from the fixture by physical means to obtain the target fixture.

[0006] In some embodiments of this application, the target temperature is 490℃-510℃ and the target time is 1.75h-2.25h.

[0007] In some embodiments of this application, the heating device includes a processing chamber, and the clamp is disposed in the processing chamber; The step of heating the fixture to a target temperature and maintaining it for a target time in an oxygen-containing atmosphere includes: The processing chamber is filled with air, the heating device is activated, the temperature of the processing chamber is heated to the target temperature and maintained for the target time.

[0008] In some embodiments of this application, removing the fixture from the heating device after cooling it to a first preset temperature includes: Turn off the heating device and allow the clamp to cool naturally; After the clamp has cooled to a first preset temperature, the clamp is removed from the heating device.

[0009] In some embodiments of this application, the first preset temperature is less than 80°C.

[0010] In some embodiments of this application, the composite resin residue includes at least one of epoxy resin, phenolic resin, and unsaturated polyester resin.

[0011] In some embodiments of this application, the step of physically removing the inorganic residue from the fixture to obtain the target fixture includes: The fixture is wiped or blown to remove inorganic residues from its surface, thus obtaining the target fixture.

[0012] In some embodiments of this application, a lint-free cloth is used to wipe the fixture.

[0013] In some embodiments of this application, compressed air is used to purge the fixture.

[0014] In some embodiments of this application, the clamp is a parallel plate clamp, which includes an upper plate and a lower plate for clamping the composite material.

[0015] The technical solutions provided by the embodiments of this application may include the following beneficial effects: The fixture recycling method does not use chemical decomposing agents, thus eliminating the need for agent preparation and fixture cleaning. This simplifies the operation process, avoids corrosion of the fixture by decomposing agents, and prevents residual decomposing agents on the fixture from contaminating the resin in subsequent tests and causing data distortion. Furthermore, no chemical waste is generated, which is beneficial to environmental protection. The method operates in an oxygen-containing atmosphere, heating the fixture to a target temperature and maintaining it for a target time. This causes the resin to break down, oxidize, and mineralize, forming gaseous products and inorganic residues. The gaseous products can escape from the fixture surface, while the inorganic residues have low bonding strength with the fixture and can be removed physically. This simple removal method does not damage the fixture and ensures its surface accuracy. This recycling method effectively cleans residual contaminants from the fixture without causing oxidation damage, thus ensuring the accuracy and efficiency of subsequent test data. The fixture can be reused, avoiding frequent replacements. Moreover, this recycling method offers good process consistency and high processing efficiency, making it suitable for batch processing of fixtures, thereby significantly reducing the R&D costs of composite materials.

[0016] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0018] Figure 1 This is a flowchart illustrating a method for recycling a composite material rheology testing fixture according to an exemplary embodiment; Figure 2 This is another flowchart illustrating a method for recycling a composite material rheological testing fixture according to an exemplary embodiment; Figure 3 This is another flowchart illustrating a method for recycling a composite material rheological testing fixture according to an exemplary embodiment; Figure 4 This is another flowchart illustrating a method for recycling a composite material rheological testing fixture according to an exemplary embodiment; Figure 5 This is a schematic diagram of the structure of a parallel plate clamp according to an exemplary embodiment.

[0019] Figure label: 1. Parallel plate clamp; 11. Upper plate; 12. Lower plate. Detailed Implementation

[0020] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0021] In the research and quality control of composite materials, rheometers are core equipment for characterizing key process parameters such as resin matrix viscosity and curing behavior. Among these, the test fixture, as a critical component in rheological testing, directly impacts the accuracy of test data due to its surface condition. After isothermal or dynamic scanning curing tests, the resin often cross-links and cures on the fixture surface, forming a chemically stable and highly adhesive contaminant layer that severely affects the reliability of subsequent tests. Related technologies primarily employ scraping, solvent immersion, and ultrasonic cleaning to remove this contaminant layer. However, because the contaminant layer is firmly attached to the fixture, significant force is usually required to scrape it off, easily damaging the fixture's high-gloss surface. Furthermore, the cross-linked thermosetting resin network is highly inert to most chemical solvents, resulting in poor chemical cleaning effects. This leads to contaminant residues on the fixture surface, affecting test accuracy and efficiency, and necessitates frequent fixture replacements, significantly increasing the research and development costs of composite materials.

[0022] Based on this, an exemplary embodiment of this application provides a method for recycling a composite material rheology testing fixture. The method does not add a chemical decomposing agent, thus eliminating the need for agent preparation and fixture cleaning, simplifying the operation process, avoiding corrosion of the fixture by the decomposing agent, and preventing residual decomposing agent on the fixture from contaminating the resin for subsequent testing and causing data distortion. Furthermore, no chemical waste is generated, which is beneficial to environmental protection. In addition, the method involves heating the fixture to a target temperature and maintaining it for a target time under an oxygen-containing atmosphere, causing the resin to fracture and oxidize, thereby mineralizing and forming gaseous products and... The inorganic residues formed by the gaseous products can escape from the surface of the fixture. The inorganic residues formed have low bonding strength with the fixture and can be removed by physical means. The removal method is simple and does not damage the fixture, thus ensuring the surface accuracy of the fixture. The recycling method of this application can clean the contaminants remaining on the fixture and avoid oxidation damage to the fixture, thereby ensuring the accuracy and efficiency of subsequent test data. This allows the fixture to be reused, avoiding frequent replacement of the fixture. Furthermore, the recycling method of this application has good process consistency and high processing efficiency, making it suitable for batch processing of fixtures, thereby significantly saving the R&D cost of composite materials.

[0023] An exemplary embodiment of this application provides a method for recycling a composite material rheology testing fixture, wherein no chemical decomposition agent is added in the recycling method.

[0024] Rheological testing requires high precision of the fixture surface. Acids, alkalis, and strong oxidants can all cause microscopic corrosion of the fixture, leading to data deviation in the rheological test. By ensuring that no chemical decomposing agents are added in the recycling method of composite material rheological testing fixtures, the corrosion of the fixture surface by decomposing agents can be avoided, thus ensuring the precision of the fixture surface and consequently the accuracy of the test data. For example, the surface roughness of the fixture can be ≤0.4µm.

[0025] refer to Figure 1 Methods for recycling composite material rheological testing fixtures include: S100. A fixture with resin residue adhering to its surface is placed in a heating device.

[0026] In step S100, the fixture is a fixture used for rheological testing of the composite material. After the composite material is subjected to rheological testing using the fixture, resin residue from the composite material adheres to the surface of the fixture. To remove this resin residue, the fixture with the resin residue on its surface is placed in a heating device.

[0027] For example, the composite resin residue includes thermosetting resin residue. For example, the clamp material includes metal, such as stainless steel. For example, the heating device is, for example, a muffle furnace.

[0028] S200. Under an oxygen-containing atmosphere, the fixture is heated to the target temperature and maintained for the target time, causing the composite resin residue to undergo thermal decomposition and thermal oxidation reactions and mineralization, generating gaseous products and inorganic residues. The gaseous products escape from the surface of the fixture. The target temperature is 480℃-520℃, and the target time is 1.5h-2.5h.

[0029] In step S200, during the heating process of the fixture, after the fixture is heated to a second preset temperature, the covalent bonds in the resin crosslinking network break due to the absorption of heat energy, generating small molecule free radicals and degrading the resin skeleton. The second preset temperature is, for example, 400°C, and the covalent bonds are, for example, C, CO, CN, etc. Furthermore, under an oxygen-containing atmosphere, the free radicals react with oxygen to generate gaseous products that escape from the surface of the fixture. The gaseous products are, for example, CO2, H2O, NO. X The gases are non-toxic, X is a rational number greater than 0, and under the condition of maintaining the target temperature for the target time, the organic carbon, hydrogen, and nitrogen elements in the resin are converted into CO2, H2O, and N2 or NO. XThis process mineralizes the resin and produces inorganic residues on the fixture surface. These inorganic residues may include, for example, non-flammable inorganic fillers or ash from the resin. The inorganic residues can be removed by wiping or blowing. The inorganic fillers may include, for example, at least one of wollastonite and calcium carbonate. Exemplarily, the composite resin residues undergo thermal decomposition and thermal oxidation reactions and are completely mineralized, leaving only inorganic residues on the fixture surface.

[0030] Thermosetting resins partially decompose at 350℃-450℃. Setting the target temperature to 480℃-520℃ ensures that the target temperature is higher than the complete decomposition temperature of the thermosetting resin but lower than the significant oxidation and phase transition temperature of the fixture metal material, such as 600℃. Setting the target temperature to 480℃-520℃ decomposes the resin without causing high-temperature oxidation damage to the fixture.

[0031] S300. After cooling the fixture to the first preset temperature, remove it from the heating device.

[0032] In step S300, the first preset temperature is, for example, room temperature.

[0033] S400. The inorganic residue is removed from the fixture by physical means to obtain the target fixture.

[0034] In step S400, physical means refers to a method of removing inorganic residues from the fixture without involving a chemical reaction. Physical means include at least one of wiping, ultrasonic cleaning, blowing, brushing, and scraping.

[0035] In this application, the fixture recycling method does not add chemical decomposing agents, thus eliminating the need for decomposing agent preparation and fixture cleaning. This simplifies the operation process, avoids corrosion of the fixture by decomposing agents, and prevents residual decomposing agents on the fixture from contaminating the resin in subsequent tests and causing data distortion. Furthermore, no chemical waste is generated, which is beneficial to environmental protection. In addition, the method involves heating the fixture to a target temperature and maintaining it for a target time in an oxygen-containing atmosphere, causing the resin to break down, oxidize, and mineralize, forming gaseous products and inorganic residues. The gaseous products can escape from the fixture surface, and the inorganic residues have low bonding strength with the fixture, allowing for simple physical removal without damaging the fixture and ensuring surface accuracy. This recycling method effectively cleans residual contaminants from the fixture and prevents oxidative damage, thus ensuring the accuracy and efficiency of subsequent test data. The fixture can be reused, avoiding frequent replacements. Moreover, this recycling method offers good process consistency and high processing efficiency, making it suitable for batch processing of fixtures, thereby significantly reducing the R&D costs of composite materials.

[0036] In one embodiment, the target temperature is 490℃-510℃, and the target time is 1.75h-2.25h. This ensures that the target temperature remains stable within the complete mineralization temperature range of the resin, allowing the resin to be completely converted into gaseous products and inorganic residues. This avoids the formation of stubborn carbonized residues due to partial decomposition caused by insufficient temperature. At the same time, the target temperature is much lower than the starting temperature at which the metal material of the fixture undergoes significant oxidation or phase transformation. Combined with a moderate holding time, this minimizes thermal damage to the fixture while ensuring thorough cleaning, preventing oxidation of the fixture surface. This preserves the surface accuracy and performance of the fixture, thereby ensuring testing accuracy.

[0037] In some embodiments, the heating device includes a processing chamber in which a rheological testing fixture is disposed. Exemplarily, the processing chamber may be the homogenization zone of a muffle furnace.

[0038] refer to Figure 2 In an oxygen-containing atmosphere, the fixture is heated to a target temperature and held for a target time, including: S210. Fill the processing chamber with air atmosphere, start the heating device, heat the temperature of the processing chamber to the target temperature and maintain it for the target time.

[0039] In step S210, the air contains oxygen, creating an air atmosphere within the processing chamber; that is, the fixture is in an oxygen-containing atmosphere when heated. The heating device is activated to raise the temperature within the processing chamber to the target temperature and maintain it for the target time. Exemplarily, the processing chamber can contain air, or it can contain oxygen-enriched air, where the oxygen content is higher than that of air.

[0040] In this embodiment, the processing chamber is set to an air atmosphere, which provides sufficient oxygen for the oxidative decomposition of the resin, allowing the organic components in the resin to be fully converted into gaseous products, achieving complete mineralization of the resin, and avoiding stubborn residues such as tar or carbides caused by insufficient oxygen. At the same time, the air can be directly taken from the environment, without the need for special preparation and storage, reducing process costs and operational complexity. In addition, the oxygen content of the air is moderate, which is sufficient to support the complete oxidation of the resin without being too violent to cause significant oxidation on the fixture surface. Thus, while ensuring the thorough cleanliness of the fixture, the surface accuracy and performance of the fixture are effectively protected, thereby ensuring the testing accuracy.

[0041] In one embodiment, reference Figure 3 After cooling the fixture to a first preset temperature, it is removed from the heating device, including: S310. Turn off the heating device and allow the fixture to cool naturally.

[0042] S320. After the fixture has cooled to the first preset temperature, remove the fixture from the heating device.

[0043] In steps S310 and S320, the heating device is turned off so that it stops heating. The cooling device is not set for the fixture, allowing the fixture to cool naturally. After the fixture cools naturally to the first preset temperature, the fixture is removed from the heating device.

[0044] In this embodiment, the heating device is turned off to allow the fixture to cool naturally without a dedicated cooling device. This avoids thermal stress caused by sudden temperature changes in the fixture, preventing deformation, cracking, or a decrease in surface accuracy, thus effectively protecting the structural integrity and dimensional stability of the fixture. At the same time, natural cooling eliminates the need for a dedicated cooling device, reducing equipment costs and making it convenient to operate and suitable for batch processing.

[0045] In one embodiment, the first preset temperature is less than 80°C. Exemplarily, the first preset temperature can be room temperature, as long as it is less than 80°C. Setting the first preset temperature to less than 80°C ensures that the surface temperature of the fixture has dropped to a safe range when it is removed, avoiding the risk of burns to operators from high-temperature removal. It also prevents the fixture from undergoing oxidation and discoloration due to sudden transfer to air with high oxygen content, ensuring the cleanliness of the fixture surface and the accuracy of subsequent test data.

[0046] In one embodiment, the composite resin residue includes at least one of epoxy resin, phenolic resin, and unsaturated polyester resin. The recycling method can completely mineralize the residues formed from at least one of epoxy resin, phenolic resin, and unsaturated polyester resin, generating escapeable gases and inorganic residues that can be easily removed by wiping or blowing, without damaging the fixture.

[0047] In one embodiment, reference Figure 4 The inorganic residue is removed from the fixture by physical means to obtain the target fixture, including: S410. Wipe or blow the fixture to remove inorganic residues from the surface of the fixture to obtain the target fixture.

[0048] In step S410, the fixture surface is wiped and blown, and the force applied to the fixture surface is small, so that the fixture surface is not damaged when removing inorganic residues.

[0049] In this embodiment, the physical removal methods are wiping and blowing, which do not damage the surface of the fixture, thus ensuring the surface accuracy of the fixture and consequently ensuring the accuracy of subsequent test data and testing efficiency.

[0050] In one embodiment, wiping the fixture with a lint-free cloth can effectively remove inorganic residues adhering to the fixture surface. The lint-free cloth itself has high cleanliness and good dust absorption capacity. During the wiping process, it will not introduce fiber debris or particulate matter, thus avoiding secondary pollution of the fixture and ensuring the cleanliness and tidiness of the fixture surface. At the same time, the lint-free cloth is soft and poses no risk of scratching the fixture surface, thus preserving the surface accuracy of the fixture.

[0051] In one embodiment, compressed air is used to blow clean the fixture, achieving cleaning without contact with the fixture surface and avoiding scratches caused by physical contact. At the same time, compressed air can blow clean the complex structure, gaps, holes and other hard-to-wipe areas of the fixture, achieving thorough cleaning. Furthermore, high-speed airflow can quickly blow away inorganic residues adhering to the fixture surface, making the operation simple and efficient. It is suitable for rapid processing of large batches of fixtures without consuming wiping consumables, further reducing cleaning costs.

[0052] In one embodiment, reference Figure 5 The fixture is a parallel plate fixture 1. The parallel plate fixture 1 can be mounted on a rheometer for rheological testing. The parallel plate fixture 1 includes an upper plate 11 and a lower plate 12 for holding the composite material.

[0053] In this embodiment, the parallel plate clamp 1 has a flat and smooth parallel surface. Setting the clamp as a parallel plate clamp 1 can provide uniform contact pressure and a consistent test area for the composite material, ensuring the accuracy and repeatability of rheological test data. At the same time, the parallel plate clamp 1 has a relatively simple structure, an open surface and no complex gaps, which is conducive to the natural escape or loose adhesion of residues generated after resin mineralization from the surface. This facilitates thorough cleaning by physical methods such as wiping or blowing, and will not cause scratches or precision damage to the clamp surface, thus completely preserving the surface flatness and parallelism of the parallel plate clamp 1.

[0054] Example Example 1: A method for recycling composite material rheological testing fixtures without adding chemical decomposition agents, and including: (1) The fixture with resin residue on its surface is placed in the heating device. A parallel plate clamp 1, with epoxy resin residue adhering to its surface, is placed inside the processing chamber of a heating device. The heating device is a muffle furnace.

[0055] (2) The processing chamber is filled with air atmosphere. The temperature of the fixture is heated to the target temperature and maintained for the target time. The heating device starts heating from room temperature, raises the temperature inside the processing chamber to 500°C, and maintains it for 2 hours.

[0056] (3) After cooling the fixture to the first preset temperature, remove it from the heating device. Turn off the heating device and allow it to cool naturally to room temperature before removing the clamp from the heating device.

[0057] Table 1 shows specific embodiments of the recycling method parameters for the composite material rheological testing fixture in this application. It should be noted that, except for the parameters listed in Table 1, the other parameters in Embodiments 2-6 are basically the same as those in Embodiment 1. Each embodiment can be repeated multiple times, for example, two or three times, to ensure that the fixture recycling process yields stable and effective results.

[0058] Table 1. Parameters and Recycling Results of Composite Material Rheological Testing Fixtures

[0059] As shown in Table 1, when the target time is 2 hours, the cleaning effect on the fixture surface improves as the target temperature increases from 400℃ to 500℃. The cleaning effect remains satisfactory from 500℃ to 550℃, but oxidation occurs at 550℃, affecting surface accuracy. Similarly, when the target temperature is 500℃ and the target time increases from 1 hour to 2 hours, the cleaning effect remains satisfactory from 2 hours to 3 hours, but oxidation occurs again at 3 hours. Therefore, a target temperature of 500℃ and a target time of 2 hours result in good surface cleanliness without oxidation. When oxidation occurs on the fixture surface, at least one of the following oxidation interference colors—yellow, blue, or purple—appears.

[0060] To further obtain better target time and target temperature, Table 2 shows specific embodiments 7-16 of the recycling method parameters for the composite material rheological testing fixture in this application. It should be noted that, apart from the parameters listed in Table 2, the other parameters of embodiments 7-16 are basically the same as those of embodiment 1. Each embodiment can be repeated multiple times, for example, 2 or 3 times, so that the results of the fixture recycling process are stable and effective.

[0061] Table 2. Parameters and Recycling Results of Composite Material Rheological Testing Fixtures

[0062] As can be seen from the data in Tables 1 and 2, the results of fixture recycling change when the target temperature and target time change. Furthermore, considering Examples 1, 8, 9, and 11-16, a target temperature between 480℃ and 520℃ and a target time between 1.5h and 2.5h yields better recycling results. Taking into account temperature fluctuations in the heating device and processing efficiency, adjusting the target temperature between 490℃ and 510℃ and the target time between 1.75h and 2.25h results in better stability and higher efficiency in the recycling process.

[0063] To verify the effectiveness of the recycling method for different resin contaminants, Table 3 shows specific embodiments 17-18 of the recycling method parameters for the composite material rheology testing fixture in this application. It should be noted that, compared with Embodiment 1, Embodiments 17-18 differ only in the material of the resin contaminant, while other parameters are basically the same. In Embodiment 1, the material of the resin contaminant is epoxy resin. Each embodiment can be repeated multiple times, for example, 2 or 3 times, to ensure that the results of the fixture recycling treatment are stable and effective.

[0064] Table 3. Parameters and Recycling Results of Composite Material Rheological Testing Fixtures

[0065] According to the data in Table 3, when the target temperature is 500℃ and the target time is 2 hours, the resin contaminants on the fixture are thoroughly removed when the materials are phenolic resin and unsaturated polyester resin. Furthermore, according to the data in Example 1 and Table 3, when the target temperature is 500℃ and the target time is 2 hours, the fixture recycling results are the same when the resin contaminants are epoxy resin, phenolic resin, and unsaturated polyester resin. This indicates that the recycling method is universally applicable to different types of thermosetting resins, does not require adjustment of process parameters based on resin type, and is simple to operate with good process consistency.

[0066] To examine the impact of the recycled fixture on the test results, Table 4 shows the rheological test results of the recycled fixture and the brand-new fixture. The target temperature and target time of each recycled fixture are not exactly the same. When the fixture is recycled, the target temperature is between 480℃ and 520℃ and the target time is between 1.5h and 2.5h. Except for the parameters in Table 4, the parameters of the recycled fixture are the same. The material used for the rheological test is the same. The viscosity scan from 40℃ to 200℃ was performed on the rotational rheometer. The viscosity value at 85℃ is shown in Table 4.

[0067] Table 4. Rheological test results of fixtures treated by recycling and brand-new fixtures.

[0068] According to the data in Table 4, the viscosity values ​​of the material measured at 85°C by the fixture treated by the recycling method of this application are all within 2 Pa·s, compared with the viscosity values ​​measured by the new fixture. This indicates that the test results are highly consistent and meet the requirements of each test standard. Therefore, it can be concluded that the fixture treated by the recycling method of this application has no significant impact on the test results and can ensure the accuracy and reliability of the rheological test data. The fixture treated by the recycling method can replace the new fixture for the rheological property testing of composite materials.

[0069] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and embodiments are to be considered exemplary only, and the true scope and spirit of this application are indicated by the following claims.

[0070] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A method for recycling a composite material rheological testing fixture, characterized in that, The recycling method for the composite material rheological testing fixture does not involve the addition of chemical decomposition agents and includes: A clamp with resin residue adhering to its surface is placed in a heating device; Under an oxygen-containing atmosphere, the fixture is heated to a target temperature and maintained for a target time, causing the composite resin residue to undergo thermal decomposition and thermal oxidation reactions and mineralization, generating gaseous products and inorganic residues. The gaseous products escape from the surface of the fixture. The target temperature is 480℃-520℃, and the target time is 1.5h-2.5h. After the clamp is cooled to a first preset temperature, it is removed from the heating device; The inorganic residue is removed from the fixture by physical means to obtain the target fixture.

2. The method for recycling the composite material rheological testing fixture according to claim 1, characterized in that, The target temperature is 490℃-510℃, and the target time is 1.75h-2.25h.

3. The method for recycling the composite material rheological testing fixture according to claim 1, characterized in that, The heating device includes a processing chamber, and the clamp is disposed in the processing chamber; The step of heating the fixture to a target temperature and maintaining it for a target time in an oxygen-containing atmosphere includes: The processing chamber is filled with air, the heating device is activated, the temperature of the processing chamber is heated to the target temperature and maintained for the target time.

4. The method for recycling the composite material rheological testing fixture according to claim 1, characterized in that, The step of removing the fixture from the heating device after cooling it to a first preset temperature includes: Turn off the heating device and allow the clamp to cool naturally; After the clamp has cooled to the first preset temperature, the clamp is removed from the heating device.

5. The method for recycling the composite material rheological testing fixture according to claim 1 or 4, characterized in that, The first preset temperature is less than 80°C.

6. The method for recycling the composite material rheological testing fixture according to claim 1, characterized in that, The composite material resin residue includes at least one of epoxy resin, phenolic resin, and unsaturated polyester resin.

7. The method for recycling the composite material rheological testing fixture according to claim 1, characterized in that, The process of physically removing the inorganic residue from the fixture to obtain the target fixture includes: The fixture is wiped or blown to remove inorganic residues from its surface, thus obtaining the target fixture.

8. The method for recycling the composite material rheological testing fixture according to claim 7, characterized in that, The fixture is wiped with a lint-free cloth.

9. The method for recycling the composite material rheological testing fixture according to claim 7, characterized in that, The fixture is purged with compressed air.

10. The method for recycling the composite material rheological testing fixture according to claim 1, characterized in that, The clamp is a parallel plate clamp, which includes an upper plate and a lower plate for clamping the composite material.

Images