Method and device for predicting aging life of chloroprene rubber lining

Abstract

The invention particularly relates to a chloroprene rubber lining aging life prediction method and device, and belongs to the technical field of rubber material aging tests. The method comprises the following steps: performing a hot oxygen aging test on a chloroprene rubber lining sample to obtain hot oxygen aging test data of the chloroprene rubber lining sample; calculating the aging damage factor of the chloroprene rubber lining sample according to the hot oxygen aging test data of the chloroprene rubber lining sample; determining an aging life evaluation formula of the chloroprene rubber lining sample according to the aging damage factor of the chloroprene rubber lining sample; calculating an aging damage factor under the aging time of the chloroprene rubber lining according to a chloroprene rubber lining aging life evaluation formula; and judging whether the chloroprene rubber lining is aged within the aging time or not according to the aging damage factor under the aging time of the chloroprene rubber lining. The device is used for implementing the steps of the method. The aging factors influencing the chloroprene rubber lining are comprehensively evaluated, and the aging life prediction accuracy of the chloroprene rubber lining is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of rubber material aging tests, and particularly to a method and device for predicting the aging life of a neoprene rubber lining. Background Art

[0002] In recent years, the corrosion-resistant and wear-resistant neoprene rubber lining has been widely used not only in industries such as chemical engineering, chemical fertilizers, iron and steel, and thermal power generation, but also in emerging industries such as seawater desalination and nuclear power equipment. At the same time, with the large-scale and complex internal structure of equipment, higher requirements have been placed on the suitability and safety of the neoprene rubber lining. Therefore, for safety requirements, it is necessary to calculate its service life to solve the potential risks existing in its use process.

[0003] Existing life prediction technologies for rubber products: The first is to classify grades according to the heat aging resistance of raw rubber and give the corresponding life accordingly. The second is the accelerated aging test prediction method based on reaction mechanism theory and molecular structure parameters. The third is the rapid laboratory determination based on aging kinetics. All three methods have unique advantages and effects and are also widely used in the field of rubber product life prediction.

[0004] During the aging process of the existing neoprene rubber lining, since many of its characteristic parameters will change at any time, there are both mechanical changes in relevant parameters and chemical changes over time under compression, and the weight distribution of measured parameters is uneven. At the same time, the traditional aging life prediction of neoprene rubber lining mainly uses compression set as the life evaluation characteristic index, which cannot comprehensively and objectively evaluate the factors affecting aging, resulting in low prediction accuracy. Summary of the Invention

[0005] Based on this, in view of the problem that the existing aging life prediction of neoprene rubber lining uses compression set as the life evaluation characteristic index, which cannot comprehensively and objectively evaluate the factors affecting the aging of neoprene rubber lining, resulting in low accuracy of the aging life prediction of neoprene rubber lining, it is necessary to provide a method and device for predicting the aging life of neoprene rubber lining to comprehensively and objectively evaluate the factors affecting the aging of neoprene rubber lining and improve the accuracy of the aging life prediction of neoprene rubber lining.

[0006] To achieve the above object, on the one hand, the present invention provides a method for predicting the aging life of a neoprene rubber lining, including the following steps: Step 1: Conduct a thermal oxygen aging test on a neoprene rubber lining sample to obtain thermal oxygen aging test data of the neoprene rubber lining sample; Step 2: Calculate the aging damage factor of the neoprene rubber lining sample according to the thermal oxygen aging test data of the neoprene rubber lining sample obtained in Step 1; Step 3: Determine the aging life evaluation formula for the neoprene lining according to the aging damage factor of the neoprene lining sample calculated in Step 2; Step 4: Calculate the aging damage factor at the aging time of the neoprene lining according to the aging life evaluation formula for the neoprene lining determined in Step 3; Step 5: Judge whether the neoprene lining ages within the aging time according to the aging damage factor at the aging time of the neoprene lining calculated in Step 4.

[0007] As one achievable way, the thermal oxygen aging test data of the neoprene lining sample includes the compression set rate and aging damage parameters at the selected temperature points and sampling periods of the neoprene lining sample; the aging damage parameter is at least one of the compression stress relaxation degree and density.

[0008] As one achievable way, Step 1: Conduct a thermal oxygen aging test on the neoprene lining sample to obtain the thermal oxygen aging test data of the neoprene lining sample, including the following steps: Use thermogravimetry to determine the temperature range of the thermal oxygen aging test of the neoprene lining sample, and select temperature points within the temperature range of the thermal oxygen aging test of the neoprene lining sample; At the selected temperature points, conduct a thermal oxygen aging test on the neoprene lining sample, and select multiple sampling periods in a way of denser in the front and sparser in the back, and measure the compression set rate and aging damage parameters of the neoprene lining sample at each sampling period.

[0009] As one achievable way, the temperature range of the thermal oxygen aging test of the neoprene lining sample is 100 - 200 °C; Select 3 - 6 temperature points within the temperature range of the thermal oxygen aging test of the neoprene lining sample, and the interval between temperature points is 5 - 35 °C; At the selected temperature points, conduct a thermal oxygen aging test on the neoprene lining sample, and select 10 - 20 sampling periods in a way of denser in the front and sparser in the back, and measure the compression set rate and aging damage parameters of the neoprene lining sample at each sampling period.

[0010] As one achievable way, the neoprene lining sample is cylindrical or dumbbell-shaped.

[0011] As one achievable way, Step 2: Calculate the aging damage factor of the neoprene lining sample according to the thermal oxygen aging test data of the neoprene lining sample obtained in Step 1, including the following steps: Perform linear fitting on the compression set rate and aging damage parameters of the neoprene lining sample at the selected temperature points to determine the correlation degree of the aging damage parameters to the compression set rate of the neoprene lining sample at the selected temperature points; According to the correlation degree of the aging damage parameter at the selected temperature point of the neoprene lining sample to the compression set rate, calculate the aging damage factor of the neoprene lining sample at the selected temperature point according to the following aging damage factor formula: B r = U + (1 - X1)η + (1 - X2)ρ Where, B r is the aging damage factor; U is the compression set rate; X1 is the correlation degree of the compression stress relaxation degree to the compression set rate; X2 is the correlation degree of the density to the compression set rate; η is the compression stress relaxation change rate; ρ is the density change rate.

[0012] As one of the realizable ways, the aging life evaluation formula of the neoprene lining is: 1A r = Where, Ar is the aging damage factor, is the pre-exponential factor, is the activation energy, R = 8.314 is the gas constant, T is the absolute temperature, τ is the aging time; Step three, according to the aging damage factor of the neoprene lining sample calculated in step two, determine the aging life evaluation formula of the neoprene lining, including the following steps: For the aging damage factor of the neoprene lining sample at the selected temperature point calculated in step two, determine the parameters and through nonlinear regression analysis; Substitute and into the aging life evaluation formula of the neoprene lining to obtain the aging life evaluation formula of the neoprene lining.

[0013] As one of the realizable ways, the aging life prediction method of the neoprene lining further includes correcting the aging life evaluation formula of the neoprene lining; correcting the aging life evaluation formula of the neoprene lining includes the following steps: Establish a finite element simulation model of the neoprene lining, obtain the relationship parameters of the contact pressure and the sealing area changing with time when the neoprene lining contacts the sealing interface, and at the same time combine the microscopic morphology map formed by the neoprene lining and the sealing interface to construct the microscopic aging interface of the neoprene lining to realize the quantitative analysis of the aging state of the neoprene lining; Through the quantitative analysis of the aging state of the neoprene lining, determine the measured value of the aging damage factor at the aging time of the neoprene lining; compare the measured value of the aging damage factor at the aging time of the neoprene lining with the calculated value of the aging damage factor; When the difference between the measured value and the calculated value of the aging damage factor at the aging time of the neoprene lining is within the set range, it indicates that the aging life evaluation formula of the neoprene lining is reliable; When the difference between the measured value and the calculated value of the aging damage factor at the aging time of the neoprene lining is outside the set range, it indicates that the aging life evaluation formula of the neoprene lining is unreliable, and it is necessary to further analyze the reasons and adjust the parameters of the finite element simulation model of the neoprene lining and / or the constants in the aging life evaluation formula of the neoprene lining until the difference between the measured value and the calculated value of the aging damage factor at the aging time of the neoprene lining is within the set range.

[0014] On the other hand, the present invention also provides an aging life prediction device for a neoprene lining, including a memory and a processor. A computer-readable instruction is stored on the memory, and when the processor executes the computer-readable instruction, the steps of the above-mentioned aging life prediction method for the neoprene lining are realized.

[0015] The beneficial technical effects of the present invention: The aging life prediction method and device for the neoprene lining of the present invention determine a reasonable temperature range and sampling period through neoprene lining samples, then conduct multi-temperature point laboratory environment tests, and then perform correlation data analysis on the test data. Weight distribution is performed on the basic damage parameters according to the magnitude of the correlation, an aging life evaluation formula for the neoprene lining is constructed, and the reliability and feasibility of the aging life evaluation formula for the neoprene lining are tested by changing important parameters. Furthermore, the standard value of the aging damage factor at the aging time of the neoprene lining is extrapolated, and then compared with the test data to realize the life prediction of the target sample; through the prediction of neoprene lining aging indicators including compression set rate, compression stress relaxation, and density, the influence of changes in basic damage parameters such as compression set rate, compression stress relaxation, and density is included, thereby comprehensively reflecting the performance changes during the aging process of the neoprene lining. The prediction accuracy is high, the prediction temperature range is wide, it has great significance for the life prediction of the neoprene lining, is applicable to the aging life prediction of the neoprene lining, and can also be used for the life prediction of other rubber products, with a wide range of use. Specific embodiments

[0016] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "provided with" and any variations thereof in the specification and claims of this application are intended to cover non-exclusive inclusion.

[0017] References to "embodiments" in this document mean that the specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears at various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0018] The present invention provides a method for predicting the aging life of a neoprene lining, comprising the following steps: Step 1: Conduct a thermal oxygen aging test on a neoprene lining sample to obtain thermal oxygen aging test data of the neoprene lining sample; Step 2: Calculate the aging damage factor of the neoprene lining sample based on the thermal oxygen aging test data of the neoprene lining sample obtained in Step 1; Step 3: Determine the aging life evaluation formula for the neoprene lining based on the aging damage factor of the neoprene lining sample calculated in Step 2; Step 4: Calculate the aging damage factor at the aging time of the neoprene lining according to the aging life evaluation formula for the neoprene lining determined in Step 3; Step 5: Determine whether the neoprene lining ages within the aging time based on the aging damage factor at the aging time of the neoprene lining calculated in Step 4.

[0019] As one possible implementation, the thermal oxygen aging test data of the neoprene lining sample includes the compression set rate and aging damage parameters at the selected temperature points and sampling periods of the neoprene lining sample; the aging damage parameter is at least one of the compression stress relaxation degree and density.

[0020] As one possible implementation, Step 1, conducting a thermal oxygen aging test on a neoprene lining sample to obtain thermal oxygen aging test data of the neoprene lining sample, includes the following steps: Use thermogravimetry to determine the temperature range of the thermal oxygen aging test of the neoprene lining sample, and select temperature points within the temperature range of the thermal oxygen aging test of the neoprene lining sample; At the selected temperature points, conduct a thermal oxygen aging test on the neoprene lining sample, and select multiple sampling periods in a way of denser sampling at the front and sparser sampling at the back, and measure the compression set rate and aging damage parameters of the neoprene lining sample at each sampling period.

[0021] As one possible implementation, the temperature range of the thermal oxygen aging test of the neoprene lining sample is 100 - 200 °C; Select 3 - 6 temperature points within the temperature range of the thermal oxygen aging test of the neoprene lining sample, and the temperature point interval is 5 - 35 °C; At the selected temperature points, a thermal oxygen aging test is carried out on the neoprene lining sample, and 10 - 20 sampling cycles are selected in the way of being dense at the front and sparse at the back, and the compression set rate and aging damage parameters of the neoprene lining sample at each sampling cycle are measured.

[0022] As one of the realizable ways, the neoprene lining sample is cylindrical or dumbbell-shaped.

[0023] As one of the realizable ways, step two, calculate the aging damage factor of the neoprene lining sample according to the thermal oxygen aging test data of the neoprene lining sample obtained in step one, including the following steps: Perform linear fitting on the compression set rate and aging damage parameters of the neoprene lining sample at the selected temperature points to determine the correlation degree of the aging damage parameters to the compression set rate of the neoprene lining sample at the selected temperature points; According to the correlation degree of the aging damage parameters to the compression set rate of the neoprene lining sample at the selected temperature points, calculate the aging damage factor of the neoprene lining sample at the selected temperature points according to the following aging damage factor formula: B r = U + (1 - X1)η + (1 - X2)ρ Among them, B r is the aging damage factor; U is the compression set rate; X1 is the correlation degree of the compression stress relaxation degree to the compression set rate; X2 is the correlation degree of the density to the compression set rate; η is the compression stress relaxation change rate; ρ is the density change rate.

[0024] As one of the realizable ways, the neoprene lining aging life evaluation formula is: 1A r = Among them, Ar is the aging damage factor, is the pre-exponential factor, is the activation energy, R = 8.314 is the gas constant, T is the absolute temperature, and τ is the aging time; Step three, determine the neoprene lining aging life evaluation formula according to the aging damage factor of the neoprene lining sample calculated in step two, including the following steps: Perform regression analysis on the aging damage factor of the neoprene lining sample at the selected temperature points calculated in step two to determine and ; Substitute and into the neoprene lining aging life evaluation formula to obtain the neoprene lining aging life evaluation formula.

[0025] When calculating the aging damage factor, it is necessary to dynamically adjust the temperature term in the formula according to the actual use temperature T to achieve cross-temperature prediction.

[0026] As one of the achievable ways, the method for predicting the aging life of a neoprene lining also includes correcting the aging life evaluation formula for the neoprene lining; correcting the aging life evaluation formula for the neoprene lining includes the following steps: Establish a finite element simulation model of the neoprene lining, obtain the relationship parameters of the contact pressure and the sealing area changing with time when the neoprene lining is in contact with the sealing interface, and at the same time, combine the microscopic morphology map formed by the neoprene lining and the sealing interface to construct the microscopic aging interface of the neoprene lining and realize the quantitative analysis of the aging state of the neoprene lining; Through the quantitative analysis of the aging state of the neoprene lining, determine the measured value of the aging damage factor at the aging time of the neoprene lining; compare the measured value of the aging damage factor at the aging time of the neoprene lining with the calculated value of the aging damage factor; When the difference between the measured value of the aging damage factor at the aging time of the neoprene lining and the calculated value of the aging damage factor is within the set range, it indicates that the aging life evaluation formula of the neoprene lining is reliable and can accurately predict the aging life of the neoprene lining; When the difference between the measured value of the aging damage factor at the aging time of the neoprene lining and the calculated value of the aging damage factor is outside the set range, it indicates that the aging life evaluation formula of the neoprene lining is unreliable and it is necessary to further analyze the reasons and adjust the parameters of the finite element simulation model of the neoprene lining and / or the constants in the aging life evaluation formula of the neoprene lining until the difference between the measured value of the aging damage factor at the aging time of the neoprene lining and the calculated value of the aging damage factor is within the set range.

[0027] By continuously correcting the complete aging life evaluation formula of the neoprene lining, the accurate prediction of the aging life of the neoprene lining is achieved.

[0028] The technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments.

[0029] Example 1 This embodiment provides a method for predicting the aging life of a neoprene lining, including the following steps: Step 1: Conduct a thermal oxygen aging test on the neoprene lining sample to obtain the thermal oxygen aging test data of the neoprene lining sample; Step 2: Calculate the aging damage factor of the neoprene lining sample according to the thermal oxygen aging test data of the neoprene lining sample obtained in Step 1; Step 3: Determine the aging life evaluation formula of the neoprene lining according to the aging damage factor of the neoprene lining sample calculated in Step 2; Step 4: Calculate the aging damage factor at the aging time of the chloroprene rubber lining according to the aging life evaluation formula of the chloroprene rubber lining determined in Step 3; Step 5: Determine whether the chloroprene rubber lining ages within the aging time according to the aging damage factor at the aging time of the chloroprene rubber lining calculated in Step 4.

[0030] In this embodiment, as one of the realizable ways, the thermal oxygen aging test data of the chloroprene rubber lining sample includes the compression set rate and aging damage parameters at the selected temperature points and sampling periods of the chloroprene rubber lining sample; the aging damage parameter is the degree of compression stress relaxation.

[0031] In this embodiment, as one of the realizable ways, Step 1: Conduct a thermal oxygen aging test on the chloroprene rubber lining sample to obtain the thermal oxygen aging test data of the chloroprene rubber lining sample, including the following steps: Use thermogravimetry to determine that the temperature range of the thermal oxygen aging test of the chloroprene rubber lining sample is 100 - 200 °C, and select a total of 3 temperature points of 100 °C, 130 °C, and 160 °C in the temperature range of the thermal oxygen aging test of the chloroprene rubber lining sample; At the selected temperature points, conduct a thermal oxygen aging test on the chloroprene rubber lining sample, and select 10 sampling periods of 0d, 3d, 5d, 7d, 12d, 18d, 22d, 28d, 35d, and 48d in the way of dense in the front and sparse in the back, and measure the compression set rate and aging damage parameters of the chloroprene rubber lining sample at each sampling period.

[0032] In this embodiment, as one of the realizable ways, the chloroprene rubber lining sample is cylindrical with a diameter of 100 mm and a height of 100 mm.

[0033] In this embodiment, the thermal oxygen aging test data of the chloroprene rubber lining is shown in Table 1.

[0034] Table 1 Thermal oxygen aging test data of chloroprene rubber lining In this embodiment, as one of the realizable ways, Step 2: Calculate the aging damage factor of the chloroprene rubber lining sample according to the thermal oxygen aging test data of the chloroprene rubber lining sample obtained in Step 1, including the following steps: Perform linear fitting on the compression set rate and compression stress relaxation degree at the selected temperature points of the chloroprene rubber lining sample to determine the correlation degree of the compression stress relaxation degree to the compression set rate at the selected temperature points of the chloroprene rubber lining sample; According to the correlation degree of the compression stress relaxation degree at the selected temperature point of the neoprene lining sample to the compression set rate, calculate the aging damage factor of the neoprene lining sample at the selected temperature point according to the following aging damage factor formula: B r = U + (1 - X1)η where, B r is the aging damage factor; U is the compression set rate; X1 is the correlation degree of the compression stress relaxation degree to the compression set rate; η is the compression stress relaxation rate; The aging damage factor formula of the neoprene lining sample at 100 °C is: B r = U + 0.48η; The aging damage factor formula of the neoprene lining sample at 130 °C is: B r = U + 0.50η; The aging damage factor formula of the neoprene lining sample at 160 °C is: B r = U + 0.42η; Calculate the aging damage factor of the neoprene lining sample at the selected temperature according to the aging damage factor formula of the neoprene lining sample at the selected temperature. The results are shown in Table 2.

[0035] Table 2 Aging damage factors of neoprene lining samples calculated in Step 2 In this embodiment, as one of the realizable ways, the aging life evaluation formula of the neoprene lining is: 1A r = where, Ar is the aging damage factor, is the pre-exponential factor, is the activation energy, R = 8.314 is the gas constant, T is the absolute temperature, and τ is the aging time; Step 3, determine the aging life evaluation formula of the neoprene lining according to the aging damage factor of the neoprene lining sample calculated in Step 2, including the following steps: According to the aging damage factor of the neoprene lining sample at the selected temperature point calculated in Step 2, obtain it by fitting through the Arrhenius equation, = 181d -1 and = 29100 J / mol; Substitute and into the aging life evaluation formula of the neoprene lining, and the aging life evaluation formula of the neoprene lining is obtained as: 1A r = In this embodiment, as one of the feasible ways, in step four, the calculated values of the aging damage factors of the chloroprene rubber lining at the aging times of 6 years and 15 years are calculated respectively according to the chloroprene rubber lining aging life evaluation formula determined in step three; Substitute the aging time τ = 6×365 into the chloroprene rubber lining aging life evaluation formula determined in step two, and the calculated value A of the aging damage factor of the chloroprene rubber lining at the aging time of 6 years is obtained r = 0.61; Substitute the aging time τ = 15×365 into the chloroprene rubber lining aging life evaluation formula determined in step two, and the calculated value A of the aging damage factor of the chloroprene rubber lining at the aging time of 15 years is obtained r = 0.85.

[0036] Under the same aging conditions, the measured values of the aging damage factors of the chloroprene rubber lining at the aging time of 6 years are 0.60, 0.61 and 0.62, and the measured values of the aging damage factors of the chloroprene rubber lining at the aging time of 15 years are 0.71, 0.74 and 0.85, indicating that the chloroprene rubber lining aging life evaluation formula is reliable.

[0037] In this embodiment, as one of the feasible ways, in step five, it is judged whether the chloroprene rubber lining ages within the aging time according to the aging damage factor of the chloroprene rubber lining at the aging time, including the following steps: When the calculated value of the aging damage factor of the chloroprene rubber lining at the aging time is within the standard range, it indicates that the chloroprene rubber lining does not age within the aging time and there is no need to replace the chloroprene rubber lining; When the calculated value of the aging damage factor of the chloroprene rubber lining at the aging time is outside the standard range, it indicates that the chloroprene rubber lining ages within the aging time and the chloroprene rubber lining needs to be replaced.

[0038] Example 2 Others are the same as in Example 1, the difference is that: in step one, a total of 4 temperature points of 125°C, 145°C, 175°C and 180°C are selected.

[0039] In this embodiment, the aging damage factors of the chloroprene rubber lining samples calculated in step two are shown in Table 3.

[0040] Table 3 Aging damage factors of chloroprene rubber lining samples calculated in step two The fitting parameters are updated to, = 165d -1 and = 27800J / mol; In this embodiment, the chloroprene rubber lining aging life evaluation formula determined in step three is: 1A r = In this embodiment, in step four, the calculated values of the aging damage factors of the chloroprene rubber lining at aging times of 6 years and 15 years are calculated respectively according to the aging life evaluation formula of the chloroprene rubber lining determined in step three; Substitute the aging time τ = 6×365 into the aging life evaluation formula of the chloroprene rubber lining determined in step two to obtain the calculated value A of the aging damage factor of the chloroprene rubber lining at an aging time of 6 years r = 0.58; Substitute the aging time τ = 15×365 into the aging life evaluation formula of the chloroprene rubber lining determined in step two to obtain the calculated value A of the aging damage factor of the chloroprene rubber lining at an aging time of 15 years r = 0.82.

[0041] Under the same aging conditions, the difference between the calculated values of the aging damage factors of the chloroprene rubber lining at the aging times in Example 2 and Example 1 is small, and the accuracy of the aging life evaluation formula of the chloroprene rubber lining is high after the temperature points are adjusted.

[0042] Example 3 Others are the same as in Example 2, the difference is that: in step one, the sampling periods are 0d, 10d, 20d, 30d, 40d, 50d, 60d, 70d, 80d, 90d.

[0043] In this embodiment, the aging damage factors of the chloroprene rubber lining samples calculated in step two are shown in Table 4.

[0044] Table 4 Aging damage factors of chloroprene rubber lining samples calculated in step two In this embodiment, the aging life evaluation formula of the chloroprene rubber lining determined in step three is: 1A r = In this embodiment, in step four, the calculated values of the aging damage factors of the chloroprene rubber lining at aging times of 6 years and 15 years are calculated respectively according to the aging life evaluation formula of the chloroprene rubber lining determined in step three; Substitute the aging time τ = 6×365 into the aging life evaluation formula of the chloroprene rubber lining determined in step two to obtain the calculated value A of the aging damage factor of the chloroprene rubber lining at an aging time of 6 years r = 0.63; Substitute the aging time τ = 15×365 into the aging life evaluation formula of the chloroprene rubber lining determined in step two to obtain the calculated value A of the aging damage factor of the chloroprene rubber lining at an aging time of 15 years r=0.88。

[0045] Under the same aging conditions, the difference in the calculated values of the aging damage factors at the aging time of the neoprene lining between Example 3 and Example 2 is small, indicating that adjusting the sampling period will not affect the accuracy of the aging life evaluation formula for the neoprene lining, and the aging life evaluation formula for the neoprene lining has high accuracy.

[0046] Through the verification of Example 2 and Example 3, the feasibility of Example 1 is further determined. By means of the Arrhenius equation to measure the influence of temperature on the aging rate, the cross-temperature prediction accuracy is significantly improved, and the sampling period will not change the accuracy of the formula, proving the universality of the parameters of the aging life prediction formula for the neoprene lining, reducing the cost of repeated tests, and effectively realizing the prediction of the aging life of the neoprene lining under complex working conditions.

[0047] As an implementation of the above method, the present invention provides an embodiment of a device for predicting the aging life of a neoprene lining. This embodiment of the device for predicting the aging life of a neoprene lining corresponds to the embodiment of the method for predicting the aging life of a neoprene lining described above.

[0048] The device for predicting the aging life of a neoprene lining described in this embodiment includes a memory, a processor, and a network interface that are communicatively connected to each other through a system bus. It should be noted that the embodiment only shows a device for predicting the aging life of a neoprene lining with a memory, a processor, and a network interface. However, it should be understood that it is not required to implement all the shown components, and more or fewer components can be alternatively implemented. Among them, those skilled in the art of the present technology can understand that the device for predicting the aging life of a neoprene lining here is a device that can automatically perform numerical calculations and / or information processing according to pre-set or stored instructions, and its hardware includes but is not limited to microprocessors, application-specific integrated circuits, programmable gate arrays, digital processors, embedded devices, etc.

[0049] The device for predicting the aging life of a neoprene lining can be a computing device such as a desktop computer, a notebook, a palm computer, and a cloud server. The device for predicting the aging life of a neoprene lining can perform human-computer interaction with the user through means such as a keyboard, a mouse, a remote control, a touchpad, or a voice control device.

[0050] The memory at least includes one type of readable storage medium, and the readable storage medium includes flash memory, hard disk, multimedia card, card-type memory, random access memory, static random access memory, read-only memory, electrically erasable programmable read-only memory, programmable read-only memory, magnetic memory, magnetic disk, optical disc, etc. In some embodiments, the memory may be an internal storage unit of the device, such as the hard disk or memory of the device. In other embodiments, the memory may also be an external storage device of the device, such as a plug-in hard disk, smart memory card, secure digital card, flash card, etc. equipped on the device. Of course, the memory may also include both the internal storage unit of the device and its external storage device. In this embodiment, the memory is generally used to store the operating system and various application software installed in the device, such as computer-readable instructions of the above-mentioned aging life prediction method for neoprene lining. In addition, the memory may also be used to temporarily store various data that have been output or will be output.

[0051] In some embodiments, the processor may be a central processing unit, controller, microcontroller, microprocessor, or other data processing chip. The processor is generally used to control the overall operation of the device. In this embodiment, the processor is used to run the computer-readable instructions stored in the memory or process data, such as running the computer-readable instructions of the above-mentioned aging life prediction method for neoprene lining.

[0052] The network interface may include a wireless network interface or a wired network interface, and the network interface is generally used to establish a communication connection between the device and other electronic devices.

[0053] The above-described embodiments merely represent several implementation manners of the present invention, and the description thereof is relatively specific and detailed, but should not be construed as a limitation on the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the appended claims.

Claims

1. A method for predicting the aging life of a chloroprene rubber lining, characterized in that: The following steps are involved: Step 1: Perform a thermal oxygen aging test on the chloroprene rubber lining sample to obtain thermal oxygen aging test data of the chloroprene rubber lining sample; Step 2: Calculate the aging damage factor of the chloroprene rubber lining sample according to the thermal oxygen aging test data of the chloroprene rubber lining sample obtained in step 1; Step 3: Determine the aging life evaluation formula of the chloroprene rubber lining according to the aging damage factor of the chloroprene rubber lining sample calculated in step 2; Step 4: Calculate the aging damage factor of the chloroprene rubber lining under the aging time according to the aging life evaluation formula of the chloroprene rubber lining determined in step 3; Step 5: Determine whether the chloroprene rubber lining ages within the aging time according to the aging damage factor of the chloroprene rubber lining under the aging time calculated in step 4.

2. The method for predicting the aging life of a chloroprene rubber lining according to claim 1, characterized in that: The thermal oxygen aging test data of chloroprene rubber lining samples include the compression permanent deformation rate and aging damage parameters of chloroprene rubber lining samples at selected temperature points and sampling cycles.

3. The method for predicting the aging life of a chloroprene rubber lining according to claim 2, characterized in that: The aging damage parameter is at least one of the degree of compressive stress relaxation and density.

4. The method for predicting the aging life of a chloroprene rubber lining according to claim 3, characterized in that: Step 1, performing a thermal oxygen aging test on the chloroprene rubber lining sample to obtain thermal oxygen aging test data of the chloroprene rubber lining sample, comprising the following steps: Thermogravimetric method is used to determine the temperature range of the thermal oxygen aging test of the chloroprene rubber lining sample, and a temperature point is selected in the temperature range of the thermal oxygen aging test of the chloroprene rubber lining sample; At the selected temperature point, the thermal oxygen aging test was carried out on the chloroprene rubber lining samples, and multiple sampling cycles were selected in a dense-first-then-sparse manner to measure the compression permanent deformation rate and aging damage parameters of the chloroprene rubber lining samples in each sampling cycle.

5. The method for predicting the aging life of a chloroprene rubber lining according to claim 4, characterized in that: The temperature range of the thermal oxygen aging test of the chloroprene rubber lining samples is 100-200°C; 3-6 temperature points are selected in the temperature range of the thermal oxygen aging test of the chloroprene rubber lining samples, and the temperature point interval is 5-35°C; at the selected temperature points, the thermal oxygen aging test is carried out on the chloroprene rubber lining samples, and 10-20 sampling cycles are selected in a dense-first-then-sparse manner, and the compression permanent deformation rate and aging damage parameters of the chloroprene rubber lining samples in each sampling cycle are measured.

6. The method for predicting the aging life of a chloroprene rubber lining according to claim 4, characterized in that: Neoprene lining samples are cylindrical or dumbbell shaped.

7. The method for predicting the aging life of a chloroprene rubber lining according to claim 3, characterized in that: Step 2, calculating the aging damage factor of the chloroprene rubber lining sample according to the thermal oxygen aging test data of the chloroprene rubber lining sample obtained in step 1, comprising the following steps: Linear fitting is performed on the compression permanent deformation rate and aging damage parameter of the chloroprene rubber lining sample at the selected temperature point to determine the correlation between the aging damage parameter and the compression permanent deformation rate at the selected temperature point of the chloroprene rubber lining sample; According to the correlation between the aging damage parameter and the compression permanent deformation rate at the selected temperature point of the chloroprene rubber lining sample, the aging damage factor at the selected temperature point of the chloroprene rubber lining sample is calculated according to the following aging damage factor formula: B r =U+(1-X1)η+(1-X2)ρ Among them, B r is the aging damage factor; U is the compression permanent deformation rate; X1 is the correlation between the degree of compression stress relaxation and the compression permanent deformation rate; X2 is the correlation between density and compression permanent deformation rate; η is the compression stress relaxation change rate; ρ is the density change rate.

8. The method for predicting the aging life of a chloroprene rubber lining according to claim 3, characterized in that: The aging life evaluation formula for chloroprene rubber lining is: 1A r ＝ Among them, Ar is the aging damage factor, is the pre-exponential factor, is the activation energy, R=8.314 is the gas constant, T is the absolute temperature, and τ is the aging time; Step 3, according to the aging damage factor of the chloroprene rubber lining sample calculated in step 2, determine the aging life evaluation formula of the chloroprene rubber lining, including the following steps: The aging damage factor of the chloroprene rubber lining sample at the selected temperature point calculated in step 2 is analyzed by nonlinear regression to determine the parameter and ; Will and Substitute it into the aging life assessment formula of chloroprene rubber lining to obtain the aging life assessment formula of chloroprene rubber lining.

9. The method for predicting the aging life of a chloroprene rubber lining according to claim 1, characterized in that: The method for predicting the aging life of a chloroprene rubber lining also includes correcting a chloroprene rubber lining aging life evaluation formula; correcting the aging life evaluation formula of a chloroprene rubber lining includes the following steps: A finite element simulation model of the neoprene lining is established to obtain the relationship parameters between the contact pressure and the sealing area over time when the neoprene lining and the sealing interface are in contact. At the same time, the microscopic morphology formed by the neoprene lining and the sealing interface is combined to construct the microscopic aging interface of the neoprene lining, and the quantitative analysis of the aging state of the neoprene lining is achieved. Through quantitative analysis of the aging state of the chloroprene rubber lining, the measured value of the aging damage factor of the chloroprene rubber lining under the aging time is determined; the measured value of the aging damage factor of the chloroprene rubber lining under the aging time is compared with the calculated value of the aging damage factor; When the difference between the measured value of the aging damage factor under the aging time of the chloroprene rubber lining and the calculated value of the aging damage factor is within the set range, it indicates that the aging life evaluation formula of the chloroprene rubber lining is reliable; When the difference between the measured value of the aging damage factor under the aging time of the chloroprene rubber lining and the calculated value of the aging damage factor is outside the set range, it indicates that the aging life assessment formula of the chloroprene rubber lining is unreliable, and it is necessary to further analyze the cause and adjust the parameters of the finite element simulation model of the chloroprene rubber lining and / or the constants in the aging life assessment formula of the chloroprene rubber lining until the difference between the measured value of the aging damage factor under the aging time of the chloroprene rubber lining and the calculated value of the aging damage factor is within the set range.

10. A device for predicting the aging life of a chloroprene rubber lining, comprising a memory and a processor, wherein the memory stores computer-readable instructions, characterized in that: When the processor executes the computer-readable instructions, the steps of the method for predicting the aging life of a chloroprene rubber lining as described in any one of claims 1 to 9 are implemented.

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