CN114720314A - Method for detecting crosslinking degree of ultraviolet crosslinked cable insulating layer - Google Patents
Method for detecting crosslinking degree of ultraviolet crosslinked cable insulating layer Download PDFInfo
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- 238000004132 cross linking Methods 0.000 title claims abstract description 89
- 238000000034 method Methods 0.000 title claims abstract description 29
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 108
- 238000010409 ironing Methods 0.000 claims abstract description 59
- 229910052742 iron Inorganic materials 0.000 claims abstract description 54
- 238000005070 sampling Methods 0.000 claims abstract description 15
- 238000001514 detection method Methods 0.000 claims abstract description 13
- 238000005476 soldering Methods 0.000 claims description 44
- 238000012360 testing method Methods 0.000 abstract description 31
- 238000012790 confirmation Methods 0.000 abstract description 8
- 238000007689 inspection Methods 0.000 abstract description 8
- 238000010561 standard procedure Methods 0.000 abstract description 3
- 229920003020 cross-linked polyethylene Polymers 0.000 description 12
- 239000004703 cross-linked polyethylene Substances 0.000 description 12
- 238000004519 manufacturing process Methods 0.000 description 11
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 9
- 238000009413 insulation Methods 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 2
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 239000000806 elastomer Substances 0.000 description 2
- 238000012812 general test Methods 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002480 mineral oil Substances 0.000 description 2
- 235000010446 mineral oil Nutrition 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910000077 silane Inorganic materials 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical group [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010382 chemical cross-linking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000009970 fire resistant effect Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 238000005067 remediation Methods 0.000 description 1
- 238000009666 routine test Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/40—Investigating hardness or rebound hardness
- G01N3/54—Performing tests at high or low temperatures
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- Pathology (AREA)
- Organic Insulating Materials (AREA)
Abstract
The invention belongs to the technical field of ultraviolet light crosslinked cables, and provides a method for detecting the crosslinking degree of an insulating layer of an ultraviolet light crosslinked cable. According to the invention, the samples are taken from two ends of the ultraviolet crosslinking cable to be detected, then the ultraviolet crosslinking cable is ironed for a plurality of times by the electric iron until the whole cross section of the sample to be detected is pressed, and finally whether the crosslinking degree of the insulating layer of the ultraviolet crosslinking cable to be detected is qualified or not is judged by judging whether the deformation generated after ironing the cross section of the sample to be detected is recovered after the electric iron is removed, so that the operation difficulty of operators and inspectors is greatly reduced, the time is saved, the efficiency of finished product inspection is improved, the product quality can be ensured, and the phenomenon that the insulating crosslinking degree is unqualified is completely avoided. The results of the examples show that the detection method provided by the invention takes 5min from sampling to result confirmation when being used for detecting the ultraviolet crosslinked cable, and the detection result is consistent with the result of the test by the standard method.
Description
Technical Field
The invention relates to the technical field of ultraviolet crosslinked cables, in particular to a method for detecting the crosslinking degree of an insulating layer of an ultraviolet crosslinked cable.
Background
The ultraviolet crosslinking process is used for producing crosslinked polyethylene insulated cables with rated voltage of 3kV or below, has the advantages of high efficiency, energy conservation, environmental protection, high production efficiency, field conservation and lower cost than the silane crosslinking process, is favored by more and more cable enterprises, and is adopted by a plurality of cable enterprises.
However, when the ultraviolet crosslinking process is used for producing the crosslinked polyethylene insulated cable, the problems which cannot be well solved up to now exist: when the operator controls the device improperly (for example, the two ends of the wire core are shaken too much when passing through the cross-linking device, the speed exceeds the process speed, the local fault of the ultraviolet cross-linking machine is not found in time, the pollution on the surface of the ultraviolet lamp tube is not effectively removed in time, etc.), the local cross-linking of the insulating layer is insufficient, the cross-linking degree index is unqualified, specifically, the elongation under load is greater than 175% and the permanent deformation rate is greater than 15% in the thermal extension test. This can lead to the product quality not meeting standard requirements, has the potential safety hazard, can produce the power supply accident when serious. And the defect of insufficient crosslinking degree is not easy to remedy or the remediation cost is too high, so that the loss of a cable enterprise is large.
In addition, the crosslinking caused by the ultraviolet crosslinking process is insufficient, and is not different from the crosslinking caused by chemical crosslinking or silane crosslinking, the crosslinking degree of the whole insulating layer is unqualified, the crosslinking caused by the ultraviolet crosslinking process is insufficient, the crosslinking degree of the whole insulating layer is unqualified, only part of the cross section of the whole insulating layer is unqualified, the crosslinking degree of the insulating layer with about 10 degrees (the cross section of the whole insulating layer is defined as 360 degrees) is found to be unqualified, and the condition is that a quality guarantee worker cannot check the cross section according to the inspection regulation, so unqualified products still flow out.
Due to the problem, the popularization and application of the ultraviolet crosslinking process are limited. Even leading some cable manufacturing enterprises to keep a repulsive attitude towards the ultraviolet light crosslinking process. However, the advantages of the ultraviolet light cross-linking process still attract a plurality of cable enterprises, so in order to ensure the quality of products delivered from the factory, the enterprises strengthen the process control of the insulation procedure and the inspection of the insulation cross-linking degree, the inspection of the cross-linking degree is listed as a routine test when the finished cables are delivered from the factory, and the cross-linking degree test is carried out on four surfaces of the annular insulating layer of each insulating core. This increases the operational difficulty for the operator and the inspector, reducing the efficiency of the finished product inspection. And, when the test is carried out by the method specified in the current standard (GB/T2951.21-2008, general test method for insulation and sheathing materials for electric and optical cables, part 21: test method for elastomer mixture, ozone resistance test, thermal extension test, mineral oil immersion test), one thermal extension test requires at least 15min, and if the test is carried out on four sides of the insulation core, at least 20min, which has great influence on the cost and efficiency of enterprises. Therefore, a method for rapidly and accurately detecting the crosslinking degree of the insulating layer of the ultraviolet crosslinked cable is needed.
Disclosure of Invention
The invention aims to provide a method for detecting the crosslinking degree of an insulating layer of an ultraviolet crosslinked cable, which is simple to operate, saves time and can ensure the product quality.
In order to achieve the above purpose, the invention provides the following technical scheme:
the invention provides a method for detecting the crosslinking degree of an insulating layer of an ultraviolet crosslinked cable, which comprises the following steps:
(1) sampling at two ends of the ultraviolet light cross-linked cable to be detected to obtain a sample to be detected;
(2) adopting an electric soldering iron to iron and press the cross section of the sample to be tested obtained in the step (1) for multiple times until the whole cross section of the sample to be tested is pressed;
if the deformation generated after the sample to be detected is ironed on the cross section of the sample to be detected each time can be recovered immediately after the electric iron is removed, judging that the crosslinking degree of the ultraviolet crosslinking cable insulating layer to be detected is qualified; and if at least one part of the deformation generated after the sample to be detected is branded and pressed on the cross section of the sample to be detected cannot be recovered after the electric soldering iron is removed, judging that the crosslinking degree of the ultraviolet crosslinking cable insulating layer to be detected is unqualified.
Preferably, the cross-sectional area of the sample to be tested in the step (1) is 25-500 mm2。
Preferably, the temperature of the electric soldering iron in the step (2) is 270-280 ℃.
Preferably, in the step (2), the staying time of the electric soldering iron on the cross section of the sample to be tested is 5-8 s when the sample to be tested is branded.
Preferably, the pressure of each ironing in the step (2) is 1-1.5N.
Preferably, the plurality of times of cauterizing in the step (2) comprises the following steps: the first ironing is carried out on the cross section of the sample to be tested, then the ironing position is changed for the next ironing, and the included angle formed by the position of the Nth ironing and the position of the N-1 th ironing is less than or equal to 30 degrees.
Preferably, the method for determining that the deformation of the sample to be measured cannot be recovered in step (2) is as follows: the thickness difference between the sample to be tested after the electric soldering iron is removed and the sample to be tested before the electric soldering iron is baked is more than or equal to 1 mm.
The invention provides a method for detecting the crosslinking degree of an insulating layer of an ultraviolet crosslinked cable, which comprises the following steps: (1) sampling at two ends of the ultraviolet light cross-linked cable to be detected to obtain a sample to be detected; (2) adopting an electric soldering iron to iron and press the cross section of the sample to be tested obtained in the step (1) for multiple times until the whole cross section of the sample to be tested is pressed; if the deformation generated after each ironing on the cross section of the sample to be detected can be recovered immediately after the electric soldering iron is removed, judging that the crosslinking degree of the ultraviolet crosslinking cable insulating layer to be detected is qualified; and if at least one part of the deformation generated after the sample to be detected is branded and pressed on the cross section of the sample to be detected cannot be recovered after the electric soldering iron is removed, judging that the crosslinking degree of the ultraviolet crosslinking cable insulating layer to be detected is unqualified. According to the invention, the samples are taken from two ends of the ultraviolet crosslinking cable to be detected, then the ultraviolet crosslinking cable is ironed for a plurality of times by the electric iron until the whole cross section of the sample to be detected is pressed, and finally whether the crosslinking degree of the insulating layer of the ultraviolet crosslinking cable to be detected is qualified or not is judged by judging whether the deformation generated after ironing the cross section of the sample to be detected is recovered after the electric iron is removed, so that the operation difficulty of operators and inspectors is greatly reduced, the time is saved, the efficiency of finished product inspection is improved, the product quality can be ensured, and the phenomenon that the insulating crosslinking degree is unqualified is completely avoided. The results of the examples show that the detection method provided by the invention takes 5min from sampling to result confirmation when being used for detecting the ultraviolet crosslinked cable, and the detection result is consistent with the result of the test by the standard method.
The method for detecting the crosslinking degree of the ultraviolet crosslinking cable insulating layer can reduce the adverse effect of an ultraviolet crosslinking process on cable production enterprises to the minimum degree, and is favorable for popularization and application of the ultraviolet crosslinking process.
Detailed Description
The invention provides a method for detecting the crosslinking degree of an insulating layer of an ultraviolet crosslinked cable, which comprises the following steps:
(1) sampling at two ends of the ultraviolet light cross-linked cable to be detected to obtain a sample to be detected;
(2) adopting an electric soldering iron to bake and press the cross section of the sample to be tested obtained in the step (1) for multiple times until the whole cross section of the sample to be tested is pressed;
if the deformation generated after each ironing on the cross section of the sample to be detected can be recovered immediately after the electric soldering iron is removed, judging that the crosslinking degree of the ultraviolet crosslinking cable insulating layer to be detected is qualified; and if at least one part of the deformation generated after the sample to be detected is branded on the cross section of the sample to be detected can not be recovered after the electric soldering iron is removed, judging that the crosslinking degree of the ultraviolet crosslinking cable insulating layer to be detected is unqualified.
The invention samples at two ends of the ultraviolet light cross-linked cable to be detected to obtain a sample to be detected. The invention ensures the accuracy of the test result by sampling at the two ends of the ultraviolet crosslinking cable to be tested.
In the invention, the detection of the crosslinking degree of the insulating layer of the ultraviolet crosslinking cable is preferably carried out on a production line. In the invention, the ultraviolet light power on the production line is preferably 90-92%; the linear speed of the production line is preferably 15-70 m/min.
The detection mode provided by the invention is suitable for testing the crosslinking degree of the insulating layers of various ultraviolet crosslinking cables. In the invention, the ultraviolet crosslinked cable to be tested preferably comprises a copper core crosslinked polyethylene insulated wire core, an aluminum core crosslinked polyethylene insulated wire core or a copper core fire-resistant crosslinked polyethylene insulated wire core.
In the invention, the cross-sectional area of the sample to be detected is preferably 25-500 mm2More preferably 70 to 300mm2。
After the sample to be detected is obtained, the electric soldering iron is adopted to burn and press the cross section of the sample to be detected for many times until the whole cross section of the sample to be detected is pressed. The invention can ensure the comprehensiveness of the test result by carrying out the ironing and pressing on the cross section of the sample to be tested for many times.
In the invention, the temperature of the electric soldering iron is preferably 270-280 ℃, and more preferably 270-275 ℃. The invention preferably controls the temperature of the electric soldering iron within the range so as to enable the sample to be detected to be fully deformed. In the present invention, the electric soldering iron is preferably an automatic temperature control electric soldering iron.
In the invention, the residence time of the electric soldering iron on the cross section of the sample to be tested is preferably 5-8 s, and more preferably 6-8 s during each ironing. The invention preferably controls the staying time of the electric soldering iron on the cross section of the sample to be tested within the range, thereby realizing the ironing of the sample to be tested and saving the time.
In the invention, the pressure of each ironing is preferably 1-1.5N, and more preferably 1.5N. The invention preferably realizes the pressurization of the sample to be tested by hanging the weight at the front end of the electric soldering iron, thereby being beneficial to avoiding the influence of different operators on the test result. In the invention, the distance between the hanging position of the weight and the end of the electric soldering iron is preferably 5-10 mm.
In the present invention, the plurality of cauterization preferably comprises: the first ironing is carried out on the cross section of the sample to be tested, then the ironing position is changed for the next ironing, and the included angle formed by the position of the Nth ironing and the position of the N-1 th ironing is less than or equal to 30 degrees.
The invention preferably changes the ironing position by rotating the electric soldering iron; the angle of each rotation is preferably ≦ 30.
In the invention, after the ironing is finished, if the deformation generated after the ironing is finished on the cross section of the sample to be tested each time can be recovered immediately after the electric iron is removed, the crosslinking degree of the ultraviolet crosslinking cable insulating layer to be tested is judged to be qualified; and if at least one part of the deformation generated after the sample to be detected is branded and pressed on the cross section of the sample to be detected cannot be recovered after the electric soldering iron is removed, judging that the crosslinking degree of the ultraviolet crosslinking cable insulating layer to be detected is unqualified.
In the present invention, the method for determining that the deformation of the sample to be measured cannot be recovered is preferably: the thickness difference between the sample to be tested after the electric soldering iron is removed and the sample to be tested before the electric soldering iron is baked is more than or equal to 1 mm.
According to the method, samples are taken from two ends of the ultraviolet cross-linked cable to be detected, the ultraviolet cross-linked cable is ironed by the electric iron for multiple times until the whole cross section of the sample to be detected is pressed, and finally whether the cross-linking degree of the insulating layer of the ultraviolet cross-linked cable to be detected is qualified or not is judged by judging whether the deformation generated after each ironing on the cross section of the sample to be detected can be recovered after the electric iron is removed, so that the operation difficulty of operators and inspectors is greatly reduced, the time is saved, the inspection efficiency of finished products is improved, the quality of the finished products is ensured, and the phenomenon that the insulating cross-linking degree is unqualified is completely avoided.
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The ultraviolet crosslinking cable to be tested: rated voltage 0.6/1kV copper core crosslinked polyethylene insulated wire core with nominal section of 35mm2；
(1) On a production line with the ultraviolet power of 90% and the linear speed of 68m/min, a production worker finds that the end of the wire core deviates from the axis of the irradiation cavity when passing through the ultraviolet crosslinking equipment, and samples are taken from two ends of the wire core to obtain a sample to be detected in order to determine whether the crosslinking degree of the wire core is qualified;
(2) setting the temperature of the automatic temperature control electric soldering iron to 270 ℃, keeping the temperature for 5min, hanging 1 weight (the ironing pressure is 1N) with the mass of 100g at a position 5mm away from the end of the electric soldering iron, then using the electric soldering iron in heating to perform primary ironing on the cross section of the sample to be tested obtained in the step (1), staying for 5s, then changing the ironing position to perform secondary ironing, wherein the included angle formed by the secondary ironing and the primary ironing is 30 degrees, continuously changing the ironing position to repeat the ironing until the whole cross section of the sample to be tested is pressed, obtaining 12 ironing points, finding that 2 ironing points have a concave deformation of 1mm after the electric soldering iron is removed, and the deformation cannot be recovered smoothly, which indicates that the crosslinking degree of the copper core crosslinked polyethylene insulated wire core is unqualified; from sampling to confirmation of the results, it took 4 min.
Comparative example 1
Sampling at two ends of the wire core in the embodiment 1 to obtain a sample to be detected; GB/T2951.21-2008 "general test method for Cable and Cable insulation and sheath materials part 21: testing a sample to be tested by a thermal extension testing method in a special testing method for elastomer mixture, namely an ozone resistance test, a thermal extension test and a mineral oil immersion test;
the test results are: elongation under load 260% (standard requirement ≦ 175%), permanent set after cooling 25% (standard requirement ≦ 15%); it can be seen that the thermal elongation test of the wire core of example 1 does not meet the standard (GB/T12706.1-2020 rated Voltage 1kV (U)m1.2kV) to 35kV (U)m40.5kV) extruded insulated power cable and accessory part 1: rated voltage 1kV (U)m1.2kV) to 3kV (U)m3.6kV) extruded insulated power cable), from which the degree of crosslinking of the core in example 1 was judged to be unacceptable; from sampling to confirmation of the results, it took 30 min.
Example 2
The ultraviolet crosslinking cable to be tested: rated voltage 0.6/1kV copper core crosslinked polyethylene insulated wire core with nominal section of 4 x 240+1 x 120mm2；
(1) Sampling at two ends of a copper core crosslinked polyethylene insulated wire core to be detected to obtain a sample to be detected;
(2) setting the temperature of the automatic temperature control electric soldering iron to 270 ℃, keeping the temperature for 5min, hanging 1 weight with the mass of 100g (namely the ironing pressure is 1N) at a position 5mm away from the end of the electric soldering iron, then using the electric soldering iron in heating to perform primary ironing on the cross section of the sample to be tested obtained in the step (1), keeping the time for 5s, then changing the ironing position to perform secondary ironing, keeping an included angle formed by the secondary ironing and the primary ironing to be 30 degrees, continuously changing the ironing position to repeat ironing until the whole cross section of the sample to be tested is pressed, obtaining 12 ironing points, removing the electric soldering iron, immediately recovering the concave deformation of the 12 ironing points, and indicating that the crosslinking degree of the copper core crosslinked polyethylene insulated wire core is qualified, and taking 8min from sampling to result confirmation.
Comparative example 2
The ultraviolet crosslinked cable to be tested in the example 2 is tested by the same test method as the comparative example 1, and the test result is shown in table 1; according to the detection results in table 1, the thermal extension test of the ultraviolet crosslinked cable to be detected in example 2 meets the standard requirement (the standard is the same as that in comparative example 1), so that the crosslinking degree of the ultraviolet crosslinked cable to be detected in example 2 is determined to be qualified; from sampling to confirmation of the results, it took 50 min.
Table 1 thermal extension test results of uv crosslinked cable to be tested in comparative example 2
Example 3
The ultraviolet light crosslinking cable to be measured: rated voltage 0.6/1kV copper core crosslinked polyethylene insulated wire core with nominal section of 150mm2；
(1) On a production line with the ultraviolet power of 90% and the linear speed of 57m/min, production workers find that the surface of an ultraviolet lamp tube is polluted when carrying out self-inspection on a production gap, worry that the crosslinking degree of the produced insulated wire core is unqualified, and sample at two ends of the wire core to obtain a sample to be detected in order to confirm whether the crosslinking degree of the wire core is qualified;
(2) setting the temperature of the automatic temperature control electric soldering iron to 270 ℃, keeping the temperature for 5min, hanging 1 weight with the mass of 100g (namely the ironing pressure is 1N) at a position 5mm away from the end of the electric soldering iron, then using the electric soldering iron in heating to perform primary ironing on the cross section of the sample to be tested obtained in the step (1), keeping the time for 5s, then changing the ironing position to perform secondary ironing, keeping an included angle formed by the secondary ironing and the primary ironing to be 30 degrees, continuously changing the ironing position to repeat the ironing until the whole cross section of the sample to be tested is pressed, obtaining 12 ironing points, removing the electric soldering iron, and then recovering the concave deformation generated by the 12 ironing points to be flat, thereby showing that the crosslinking degree of the copper core crosslinked polyethylene insulated wire core is qualified, and taking 5min from sampling to result confirmation.
Comparative example 3
The ultraviolet crosslinked cable to be tested in example 3 was tested by the same test method as in comparative example 1, and the test result is: elongation under load is 90%, and permanent deformation after cooling is 5%; it can be seen that the thermal extension test of the uv crosslinked cable to be tested in example 3 meets the standard requirement (the standard is the same as that in comparative example 1), and thus the crosslinking degree of the uv crosslinked cable to be tested in example 3 is determined to be qualified; from sampling to confirmation of the results, it took 35 min.
It can be seen from the above examples and comparative examples that the results of the testing of the degree of crosslinking of the ultraviolet crosslinked cable insulation layer by the testing method provided by the present invention are consistent with the results of the testing by the existing standard methods, and the testing method provided by the present invention is short in time consumption and simple and convenient to operate.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (7)
1. A method for detecting the crosslinking degree of an insulating layer of an ultraviolet crosslinking cable comprises the following steps:
(1) sampling at two ends of the ultraviolet light cross-linked cable to be detected to obtain a sample to be detected;
(2) adopting an electric soldering iron to bake and press the cross section of the sample to be tested obtained in the step (1) for multiple times until the whole cross section of the sample to be tested is pressed;
if the deformation generated after each ironing on the cross section of the sample to be detected can be recovered immediately after the electric soldering iron is removed, judging that the crosslinking degree of the ultraviolet crosslinking cable insulating layer to be detected is qualified; and if at least one part of the deformation generated after the sample to be detected is branded and pressed on the cross section of the sample to be detected cannot be recovered after the electric soldering iron is removed, judging that the crosslinking degree of the ultraviolet crosslinking cable insulating layer to be detected is unqualified.
2. The detection method according to claim 1, wherein the cross-sectional area of the sample to be detected in the step (1) is 25 to 500mm2。
3. The detection method as claimed in claim 1, wherein the temperature of the electric soldering iron in the step (2) is 270-280 ℃.
4. The detection method according to claim 1, wherein in the step (2), the staying time of the electric soldering iron on the cross section of the sample to be detected is 5-8 s each time the sample is baked.
5. The detection method according to claim 1, wherein the pressure per cauterization in the step (2) is 1-1.5N.
6. The detection method according to claim 1, wherein the plurality of cauterization in the step (2) comprises: the first ironing is carried out on the cross section of the sample to be tested, then the ironing position is changed for the next ironing, and the included angle formed by the Nth ironing and the (N-1) th ironing positions is less than or equal to 30 degrees.
7. The detection method according to claim 1, wherein the determination that the deformation of the sample to be measured cannot be recovered in step (2) is performed in a manner that: the thickness difference between the sample to be tested after the electric soldering iron is removed and the sample to be tested before the electric soldering iron is baked is more than or equal to 1 mm.
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| 史群妮: "一种压裂用抗高温交联剂的研究", 中国优秀硕士学位论文全文数据库工程科技I辑, no. 2017, 15 November 2017 (2017-11-15), pages 73 * |
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