A method for testing the reaction temperature of photocurable composite materials

Abstract

This invention relates to a method for testing the reaction temperature of photocurable composite materials. The testing device includes a constant temperature chamber, a photocuring unit, a loading unit, and a data acquisition unit. The constant temperature chamber includes a chamber body and a heating unit and a heat dissipation unit fixedly connected to the chamber body. The photocuring unit is fixedly connected to the upper end of the chamber body and communicates with the interior of the chamber body. The loading unit includes a fixing plate, a pressure plate, and a fixing clamp. The fixing plate is fixedly connected to the chamber body, and the pressure plate is used to press the test specimen onto the fixing plate. The data acquisition unit includes a controller, a first temperature sensor, a second temperature sensor, and an information acquisition device. The controller is electrically connected to the first temperature sensor, the second temperature sensor, and the information acquisition device. This testing method can effectively detect the temperature change of composite material specimens during the curing process, providing experimental support for composite material research.

Description

Technical Field

[0001] This invention belongs to the field of polymer grouting material testing technology, specifically relating to a method for testing the reaction temperature of photocurable composite materials. Background Technology

[0002] The total length of urban drainage pipelines in my country has reached 802,700 kilometers. Early-built underground pipelines often suffer varying degrees of damage after 15-30 years of operation due to various reasons such as pipe breakage, misalignment, cracks, and internal and external corrosion. Even many newly constructed pipelines develop defects within a few years of burial. Pipeline failures can cause minor issues like road collapses, underground seepage, resource waste, and traffic congestion; serious consequences include environmental pollution, safety accidents, and severe threats to people's lives and property, greatly hindering the country's urbanization and industrialization. For pipelines with safety hazards, traditional full-scale excavation and repair methods are not only time-consuming and labor-intensive, and difficult to implement, but may also involve substantial compensation costs.

[0003] Compared to traditional open-cut repair, trenchless repair technologies offer advantages such as lower construction noise, lower costs, higher repair efficiency, and less environmental impact. Among these, in-situ solidified lining (CIPP) is a commonly used method.

[0004] CIPP, as a composite material, can be evaluated for its curing degree and effect by monitoring its surface temperature, leveraging the relationship between the exothermic reaction properties, curing properties, and mechanical properties of composite materials. Currently, research on CIPP curing materials is still in its early stages, with many technical parameters relying on foreign data and construction experience. Numerous scholars both domestically and internationally have studied problems encountered during the curing process of CIPP curing materials, such as uneven curing, overheating, and long manufacturing times. Long Xiang et al. cured the composite material using three different methods and observed the temperature changes during the curing process. Pantelellis et al. established a one-dimensional nonlinear finite element analysis model for composite materials, obtaining the temperature change law of the composite laminate. Loos established a one-dimensional finite element analysis model, analyzing and obtaining the relationship between the curing temperature change history and the degree of curing, temperature, and resin flow. Bogetto and Giliespie established a two-dimensional heat conduction model for composite materials, studying the development history of the degree of curing and temperature of any cross-section of a thick-section laminate through a curing kinetic coupling model. However, all of these studies have theoretically investigated the curing temperature changes of CIPP curing materials, lacking experimental support. Therefore, providing a testing device and method for the reaction temperature of photocurable composite materials is particularly necessary for the research of CIPP curing materials. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a method for testing the reaction temperature of photocurable composite materials. This method can effectively detect the temperature changes of composite material specimens during the curing process, providing experimental support for composite material research.

[0006] The technical solution of the photocurable composite material reaction temperature testing method of the present invention is as follows:

[0007] A method for testing the reaction temperature of a photocurable composite material, characterized in that the equipment used in the testing method includes a photocurable composite material reaction temperature testing device, the testing device including a constant temperature chamber, a photocuring device, a loading unit, and a data acquisition unit;

[0008] The constant temperature chamber includes a chamber body and a heating unit and a heat dissipation unit fixedly connected to the chamber body. The light curing device is fixedly connected to the upper end of the chamber body and communicates with the interior of the chamber body.

[0009] The loading unit includes a fixed plate, a pressure plate, and a fixing clamp. The fixed plate is fixedly connected to the housing. The pressure plate is used to press the test piece onto the fixed plate. The fixing clamp is used to clamp the fixed plate and the pressure plate.

[0010] The data acquisition unit includes a controller, a first temperature sensor, a second temperature sensor, and an information acquisition device. The controller is electrically connected to the first temperature sensor, the second temperature sensor, and the information acquisition device. There are two first temperature sensors, which are respectively arranged on the upper and lower surfaces of the test piece. The second temperature sensor is used to detect the temperature inside the constant temperature chamber.

[0011] The testing method includes the following steps:

[0012] S1: Fabricate a long strip-shaped test piece. During the fabrication process, embed the first temperature sensor on the upper and lower surfaces of the test piece respectively, and use wires to electrically connect the first temperature sensor to the controller.

[0013] S2: Place the prepared test piece onto the fixing plate, press the pressure plate onto the test time, and use the fixing clamp to fix the fixing plate and the pressure plate. Adjust the distance between the ultraviolet lamp and the test piece to the set test distance by adjusting the height of the ultraviolet lamp in the light curing device.

[0014] S3: Turn on the constant temperature chamber and adjust it to the set temperature. Under the action of the heating unit and the heat dissipation unit, the temperature inside the constant temperature chamber is maintained at the set temperature. Turn on the light curing device. During the curing process of the test time, the two first temperature sensors collect the internal temperature change of the test time and transmit the detection data to the information acquisition device. When the test piece reaches the set time, turn off the light curing device and take out the test piece.

[0015] S4: Repeat the above steps to test temperature parameters for test specimens of different thicknesses, different curing times, and different test distances.

[0016] As a further improvement to the above technical solution, in S2, the position of the test piece is adjusted so that it is directly below the ultraviolet lamp in the photocuring device.

[0017] As a further improvement to the above technical solution, in S2, the pressure plate and the fixing plate have the same shape. When the pressure plate presses on the test piece, the four corners of the pressure plate and the fixing plate are aligned vertically. Four fixing clamps are used to clamp the four corners of the fixing plate and the pressure plate respectively.

[0018] As a further improvement to the above technical solution, the box is provided with a mesh protective cover, the heating unit is installed in the box and located on the lower side of the protective cover, and the heat dissipation unit includes a heat dissipation fan, which is fixedly connected to the outside of the box.

[0019] As a further improvement to the above technical solution, both the fixing plate and the pressure plate are made of transparent plexiglass.

[0020] This invention provides a device and method for testing the reaction temperature of photocurable composite materials. Compared with the prior art, its advantages are as follows:

[0021] The photocurable composite material reaction temperature testing method of this invention ensures a constant external temperature, avoiding the influence of external temperature variations, and can simulate different external temperatures to test the temperature of the composite material during the curing process under different external temperatures. By collecting the temperature of the composite material specimen during the curing process using an information acquisition device, the temperature changes of the composite material specimen during curing can be analyzed. By testing the surface temperature of composite material specimens of different thicknesses and materials at different external temperatures and curing distances, the influence of thickness, external temperature, material, and fixed distance on the curing temperature changes during the curing process can be analyzed, thus providing strong data support for the study of fixed temperature of composite materials. Furthermore, the photocurable composite material reaction temperature testing device of this invention has a simple structure, is easy to manufacture, has low cost, and is convenient to operate. Attached Figure Description

[0022] Figure 1 This is a front view of the photocurable composite material reaction temperature testing device of the present invention;

[0023] Figure 2 This is a side view of the photocurable composite material reaction temperature testing device of the present invention;

[0024] Figure 3 This is a schematic diagram of the loading unit in the photocurable composite material reaction temperature testing device of the present invention;

[0025] Figure 4 This is a flowchart of the photocurable composite material reaction temperature testing method of the present invention;

[0026] In the diagram: 1. Box body; 2. Heating unit; 3. Protective cover; 4. Heat dissipation unit; 5. Photocuring device; 6. Loading unit; 7. Fixing plate; 8. Pressure plate; 9. Test piece; 10. First temperature sensor; 11. Second temperature sensor; 12. Controller; 13. Information acquisition device. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0028] A specific embodiment of the photocurable composite material reaction temperature testing method of the present invention includes a photocurable composite material reaction temperature testing device, such as... Figures 1 to 3 As shown.

[0029] Specifically, the photocurable composite material reaction temperature testing device includes a constant temperature chamber, a photocuring device 5, a loading unit 6, and a data acquisition unit. The constant temperature chamber includes a chamber body 1 and a heating unit 2 and a heat dissipation unit 4 fixedly connected to the chamber body 1. The photocuring device 5 is fixedly connected to the upper end of the chamber body 1 and communicates with the interior of the chamber body 1. The loading unit 6 includes a fixing plate 7, a pressure plate 8, and a fixing clamp. The fixing plate 7 is fixedly connected inside the chamber body 1. The pressure plate 8 is used to press the test piece 9 onto the fixing plate 7. The fixing clamp is used to clamp the fixing plate 7 and the pressure plate 8.

[0030] In this embodiment, the data acquisition unit includes a controller 12, a first temperature sensor 10, a second temperature sensor 11, and an information acquisition device 13. The controller 12 is electrically connected to the first temperature sensor 10, the second temperature sensor 11, and the information acquisition device 13. Two first temperature sensors 10 are arranged on the upper and lower surfaces of the test piece 9, respectively. The second temperature sensor 11 is used to detect the temperature inside the constant temperature chamber. The information acquisition device 13 is a computer and an acquisition program installed in the computer. A mesh protective cover 3 is provided inside the chamber 1. The heating unit 2 is installed inside the chamber 1 and located below the protective cover 3. The heat dissipation unit 4 includes a cooling fan, which is fixedly connected to the outside of the chamber 1. The fixing plate 7 and the pressure plate 8 are both made of transparent plexiglass.

[0031] The method for testing the reaction temperature of photocurable composite materials of the present invention includes the following steps: Figure 4 As shown.

[0032] S1: Fabricate a strip-shaped test piece 9. During the fabrication process, embed the first temperature sensor 10 on the upper and lower surfaces of the test piece 9 respectively, and use wires to electrically connect the first temperature sensor 10 to the controller 12.

[0033] S2: Place the prepared test piece 9 on the fixing plate 7, press the pressure plate 8 on the test time, and use the fixing clamp to fix the fixing plate 7 and the pressure plate 8. Adjust the distance between the ultraviolet lamp and the test piece 9 to the set test distance by adjusting the height of the ultraviolet lamp in the light curing device 5.

[0034] S3: Open the constant temperature chamber and adjust it to the set temperature. Under the action of the heating unit 2 and the heat dissipation unit 4, the temperature inside the constant temperature chamber is kept at the set temperature. Turn on the light curing device 5. During the curing process of the test time, the two first temperature sensors 10 respectively collect the internal temperature change of the test time and transmit the detection data to the information acquisition device 13. When the test piece reaches the set time, turn off the light curing device 5 and take out the test piece 9.

[0035] S4: Repeat the above steps to test the temperature parameters of test pieces with different thicknesses, different curing times, and different test distances.

[0036] Preferably, in step S2, the position of the test piece 9 is adjusted so that it is directly below the ultraviolet lamp in the light curing device 5. The pressure plate 8 and the fixing plate 7 have the same shape. When the pressure plate 8 is pressed on the test piece 9, the four corners of the pressure plate 8 and the fixing plate 7 are aligned vertically. Four fixing clamps are used to clamp the four corners of the fixing plate 7 and the pressure plate 8 respectively.

[0037] The photocurable composite material reaction temperature testing method of this invention can ensure a constant external temperature, avoiding the influence of external temperature changes, and can simulate different external temperatures to test the temperature of the composite material during the curing process under different external temperatures. By collecting the temperature of the composite material specimen during the curing process through the information acquisition device 13, the temperature change of the composite material specimen during curing can be analyzed. By testing the surface temperature of composite material specimens of different thicknesses and materials at different external temperatures and curing distances, the influence of thickness, external temperature, material, and fixed distance on the curing temperature change during the curing process can be analyzed, thus providing strong data support for the study of fixed temperature of composite materials. In addition, the photocurable composite material reaction temperature testing device of this invention has a simple structure, is easy to manufacture, has low cost, and is convenient to operate.

[0038] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method of testing the reaction temperature of a photocured composite material, characterized in that, The device used in the test method comprises a light-cured composite reaction temperature test device, the test device comprising a thermostat, a light-curing device, a loading unit and a data acquisition unit; The thermostat comprises a box body, a heating unit and a heat dissipation unit fixedly connected to the box body, and the light-curing device is fixedly connected to the upper end of the box body and communicates with the inside of the box body; The loading unit comprises a fixed plate, a pressing plate and a fixed clamp, the fixed plate is fixedly connected in the box body, the pressing plate is used to press the test piece on the fixed plate, and the fixed clamp is used to clamp the fixed plate and the pressing plate; The data acquisition unit comprises a controller, a first temperature sensor, a second temperature sensor and an information acquisition device, the controller is electrically connected with the first temperature sensor, the second temperature sensor and the information acquisition device, the first temperature sensor has two, which are respectively arranged on the upper and lower surfaces of the test piece, and the second temperature sensor is used to detect the temperature in the thermostat; The test method comprises the following steps: S1: a long strip-shaped test piece is made, and during the manufacturing process, a first temperature sensor is embedded on the upper and lower surfaces of the test piece, and the first temperature sensor is electrically connected with the controller by using a wire; S2: the prepared test piece is placed on the fixed plate, the pressing plate is pressed on the test piece, the fixed plate and the pressing plate are fixed by using the fixed clamp, the distance between the ultraviolet lamp in the light-curing device and the test piece is adjusted to a set test distance by adjusting the height of the ultraviolet lamp in the light-curing device; S3: the thermostat is turned on, the thermostat is adjusted to a set temperature, the thermostat keeps the temperature in the thermostat at the set temperature under the action of the heating unit and the heat dissipation unit, the light-curing device is turned on, the two first temperature sensors respectively collect the temperature change in the test piece during the curing process of the test piece, and the detection data is transmitted to the information acquisition device, when the fixing time of the test piece reaches the set time, the light-curing device is turned off, and the test piece is taken out; S4: repeat the above steps to test the temperature parameters under different thicknesses of the test piece, different curing times and different test distances.

2. The photocured composite reaction temperature test method of claim 1, wherein, In S2, the position of the test piece is adjusted so that the test piece is directly below the ultraviolet lamp in the light-curing device.

3. The photocured composite reaction temperature test method of claim 1, wherein, In S2, the pressing plate and the fixed plate are the same shape, the four corners of the pressing plate and the fixed plate are aligned when the pressing plate is pressed on the test piece, and four fixed clamps are used to clamp the four corners of the fixed plate and the pressing plate.

4. The photocured composite reaction temperature test method of claim 1, wherein, The box body is provided with a mesh-shaped protective cover, the heating unit is installed in the box body and located below the protective cover, and the heat dissipation unit comprises a heat dissipation fan, and the heat dissipation fan is fixedly connected to the outside of the box body.

5. The photocured composite reaction temperature test method of claim 1, wherein, The fixed plate and the pressing plate are both made of transparent organic glass.

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