CN107505255A - A kind of preprocess method of heat-shrink tube and its application - Google Patents
A kind of preprocess method of heat-shrink tube and its application Download PDFInfo
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- CN107505255A CN107505255A CN201710637509.0A CN201710637509A CN107505255A CN 107505255 A CN107505255 A CN 107505255A CN 201710637509 A CN201710637509 A CN 201710637509A CN 107505255 A CN107505255 A CN 107505255A
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
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Abstract
A kind of preprocess method of heat-shrink tube and its application, it is related to material properties test field.The preprocess method shrinkable sleeve is made outside cable band pipe cable, and carries out crosslinking with radiation to band pipe cable.Inventor has found in long-term practice, heat-shrink tube situation easily cracking in thermo-oxidative ageing test, influences the process tested.And cause cracking the main reason for be heat-shrink tube retraction force it is too big, heat-shrink tube excessively bounces back.Inventor has found, before thermo-oxidative ageing test is carried out, carries out pre-irradiated processing to test sample, can increase the degree of cross linking of heat-shrink tube, so as to play the purpose of limitation retraction, to improve the crack resistence performance of test sample.The preprocess method is applied in the test of heat-shrink tube thermo-oxidative ageing, can be good at ensureing the integrality of test sample in testing, so as to greatly increase the success rate of test.
Description
Technical field
The present invention relates to material properties test field, preprocess method in particular to a kind of heat-shrink tube and its should
With.
Background technology
For applying the thermal contraction cable accessory in nuclear power station, because its field of employment environmental condition is special, so pacifying to it
The requirement of full property.For this kind of cable accessory, should not only have electrical resistance excellent possessed by general thermal contraction cable accessory
Energy, mechanical and physical performance and fire resistance, should also have longer service life and radiation-resistant property.
During to thermal contraction cable accessory identification used in nuclear power station, in order to verify whether it meets to use at 90 DEG C
The requirement of at least 60 years service life, it is necessary to cable heat shrinkage bush (component) is carried out to accelerate thermo-oxidative ageing test, and subsequently
Conventional irradiation degradation-major accident radiation aging experiment-LOCA experiment etc..Wherein, thermo-oxidative ageing sample making is accelerated
It is complicated and strict, and test period is longer (typically at 40-50 days), if because accelerating thermo-oxidative ageing test sample manufacturing process to lose
Tubing is caused in test process to ftracture by mistake, the other tests that can not be just continued, and it is very long to prepare sample cycle again, often
Often result in detection progress seriously to lag and affect opportunity adversely, cause the waste of cost of labor and time cost.Thus it is guaranteed that test specimens
Product have certain crack resistence ability particularly significant.
The content of the invention
It is an object of the invention to provide a kind of preprocess method of heat-shrink tube, and it can be located in advance to test sample
Reason, to improve the crack resistence performance of test sample, ensures its integrality in thermo-oxidative ageing test process.
Another object of the present invention is to provide a kind of preprocess method of heat-shrink tube in the test of heat-shrink tube thermo-oxidative ageing
Application, after employing the preprocess method, can ensure well test sample heat-shrink tube thermo-oxidative ageing test in it is complete
Property, improve the success rate of test.
What embodiments of the invention were realized in：
A kind of preprocess method of heat-shrink tube, it includes：
Shrinkable sleeve is made to band pipe cable outside cable, and crosslinking with radiation will be carried out with pipe cable.
A kind of application of preprocess method of above-mentioned heat-shrink tube in the test of heat-shrink tube thermo-oxidative ageing.
The beneficial effect of the embodiment of the present invention is：
The invention provides a kind of preprocess method of heat-shrink tube, and it shrinkable sleeve is made outside cable band pipe electricity
Cable, and crosslinking with radiation is carried out to band pipe cable.Inventor has found that heat-shrink tube holds in thermo-oxidative ageing test in long-term practice
Easily cracking situation, influence the process of test.And cause cracking the main reason for be heat-shrink tube retraction force it is too big, pyrocondensation
Pipe excessively retraction.Inventor is had found, before thermo-oxidative ageing test is carried out, pre-irradiated processing, Ke Yizeng are carried out to test sample
The degree of cross linking of the draw is heated, so as to play the purpose of limitation retraction, to improve the crack resistence performance of test sample, ensures that it is being surveyed
Integrality during examination.
Present invention also offers a kind of application of preprocess method of heat-shrink tube in the test of heat-shrink tube thermo-oxidative ageing, pass through
The preprocess method is carried out to test sample, can ensure that test sample is complete in the test of heat-shrink tube thermo-oxidative ageing well
Property, so as to greatly increase the success rate of test.
Embodiment
, below will be in the embodiment of the present invention to make the purpose, technical scheme and advantage of the embodiment of the present invention clearer
Technical scheme be clearly and completely described.Unreceipted actual conditions person, builds according to normal condition or manufacturer in embodiment
The condition of view is carried out.Agents useful for same or the unreceipted production firm person of instrument, it is the conventional production that can be obtained by commercially available purchase
Product.
The preprocess method to a kind of heat-shrink tube of the embodiment of the present invention and its application are specifically described below.
A kind of preprocess method of heat-shrink tube, it includes：
S1., shrinkable sleeve is made to band pipe cable outside cable.
Further, in embodiments of the present invention, used in nuclear power station 1E level K1~K3 type shrinkable tubes are related generally to.
1E levels are reactor and nuclear power station electric system and the level of security of equipment.Refer to and complete reactor emergency shut-down；Peace
Full shell isolation, the emergent cooling of reactor core, reactor waste export, the thermal conductivity of containment vessel go out；Prevent radioactive substance to week
Enclose the safe level of the electrical system equipment of the functions such as environmental emission.
K1 class electric operators.Within nuclear reactor safety shell, under ambient environment and in SL2 (peaces
The earthquake of full cut-off heap) remain to perform its defined function below load and during accident or after accident.
K2 class electric operators.Within nuclear reactor safety shell, under ambient environment and in SL2 (peaces
The earthquake of full cut-off heap) remain to perform its defined function under load.
K3 class electric operators.Beyond nuclear reactor safety shell, under ambient environment and in SL2 (peaces
The earthquake of full cut-off heap) remain to perform its defined function under load.
For this kind of cable accessory, should not only have electric property excellent possessed by general thermal contraction cable accessory,
Mechanical and physical performance and fire resistance, should also have longer service life and radiation-resistant property.For making for present nuclear power station
From the point of view of the life-span, it is desirable to which such cable accessory at least uses 60 years at 90 DEG C.
Accordingly, in the embodiment of the present invention, the cable related generally to is similarly the cable of used in nuclear power station 1E level K1~K3 classes.
It can be the high-tension electricities such as low-voltage cable or 6/6kV cables, 6.6/10kV cables, the 8.7/10kV of 0.6/1kV cables
Cable.The preprocess method has good universality.
Further, the material of heat-shrink tube mainly includes cross-linked polyolefin and EP rubbers.EP rubbers be with ethene and
The copolymer that monomer synthesizes based on propylene, the ageing-resistant performance such as its resistance to ozone, heat-resisting, weather-proof is excellent, has good resistance toization
Product, electrical insulation capability, impact elasticity, cryogenic property, low-density and high fillibility and hot water resistance and water-fast vapor permeability etc., are fitted
The adverse circumstances in synkaryon power station.But EP rubbers does not have pyrocondensation function, it is necessary to be used cooperatively with cross-linked polyolefin.
Wherein, cross-linked polyolefin include crosslinked polyethylene, crosslinked polypropylene, cross-linked ethylene-propylene acid methyl terpolymer and
At least one of cross-linked ethylene-acetic acid hexene copolymer.Cross-linked polyolefin has good pyrocondensation function after crosslinking, with
EP rubbers is used cooperatively, and just can overcome the disadvantages that the deficiency of EP rubbers, with the same of excellent ageing-resistant and erosion-resisting characteristics
When, possess pyrocondensation function.
In embodiments of the present invention, shrinkable sleeve is located at cable outer layer, and heating makes heat-shrink tube that pyrocondensation occur to be made
Band pipe cable.Heat-shrink tube can select pyrocondensation ratio as 3:1 or 2:1 heat-shrink tube, and ensure internal diameter of the heat-shrink tube before pyrocondensation
More than the external diameter of cable, while the internal diameter after pyrocondensation is less than the external diameter of cable, so that heat-shrink tube can be wrapped closely after pyrocondensation
It is overlying on outside cable.
Pyrocondensation process can be using the cable by heat-shrink tube is cased with the side that 5~10s is stopped on 500~600 DEG C of flame
Formula carries out quick pyrocondensation.During pyrocondensation, the shrinkage factor of heat-shrink tube reaches 75%~85%.By the creation of inventor
Property work find, when the shrinkage factor of heat-shrink tube is 75%~85%, can guarantee that the intensity of heat-shrink tube, its properties is preferable.Value
Obtain it is noted that in the other preferred embodiments of the present invention, heat-shrink tube can also be placed in 150~200 DEG C of baking oven and toast 5
~10min carries out pyrocondensation at a slow speed, can be selected according to the needs in practical operation.
A kind of preprocess method for heat-shrink tube that the embodiment of the present invention is provided, in addition to：
S2. crosslinking with radiation will be carried out with pipe cable.
Dose of radiation when in embodiments of the present invention, to carrying out crosslinking with radiation with pipe cable is 50~100KGy.To band
Pipe cable carries out pre-irradiated processing, can increase the degree of cross linking of heat-shrink tube, so as to play limitation in being tested in thermo-oxidative ageing
The purpose of heat-shrink tube retraction, to prevent heat-shrink tube because excessively being ftractureed caused by retraction, improve the crack resistence of test sample
Energy.Found by inventor's performing creative labour, can ensure that heat-shrink tube reaches enough friendships in 50~100KGy of dose of radiation
Connection degree, obtain preferable crack resistence performance.Further increase dose of radiation, although can still lift crack resistence performance, lifting
Decreased effectiveness, cause the waste of energy.
Further, after crosslinking with radiation is carried out to band pipe cable, in addition to by the band pipe cable after crosslinking with radiation in
24~48h is stood at room temperature.Standing can allow caused small-molecule substance during crosslinking with radiation fully to volatilize, and avoid it to heat
The performance of the draw impacts.Inventor has found that the time of standing is at least up to 24h by selftest, you can ensures small point
Sub- material volatilization is abundant.Meanwhile band pipe cable can still be used to thermo-oxidative ageing test, and can guarantee that after the several months is preserved
Test effect.But in order to avoid the situation about being polluted with pipe cable by new impurity for preserving and bringing for a long time as far as possible, during standing
Between control it is preferable in 24~48h.
A kind of application of preprocess method of above-mentioned heat-shrink tube in the test of heat-shrink tube thermo-oxidative ageing.
The feature and performance of the present invention are described in further detail with reference to embodiments.
Embodiment 1
The test that the present embodiment provides a kind of preprocess method of heat-shrink tube and obtained after being handled by the preprocess method
Sample.The preprocess method comprises the following steps：
S1. the cable of heat-shrink tube will be arranged with, in heating 5s on 500~600 DEG C of flame, obtains band pipe cable.
S2. it will be put into pipe cable in accelerator dolly and carry out crosslinking with radiation, dose of radiation 50KGy.
S3. the band pipe cable after crosslinking with radiation is stood into 24h, obtains required test sample.
Wherein, the main material of heat-shrink tube is crosslinked polyethylene and EP rubbers, and safe class reaches 1E level K1 classes.Cable
It is low-smoke halogen-free flame retardant, model 0.6/1kV single-core power cables, its insulating barrier is crosslinked polyethylene material, safety etc.
Level reaches 1E level K1 classes.
Embodiment 2
The test that the present embodiment provides a kind of preprocess method of heat-shrink tube and obtained after being handled by the preprocess method
Sample.The preprocess method comprises the following steps：
S1. the cable of heat-shrink tube will be arranged with, in heating 10s on 500~600 DEG C of flame, obtains band pipe cable.
S2. it will be put into pipe cable in accelerator dolly and carry out crosslinking with radiation, dose of radiation 100KGy.
S3. the band pipe cable after crosslinking with radiation is stood into 24h, obtains required test sample.
Wherein, the main material of heat-shrink tube is crosslinked polyethylene and EP rubbers, and safe class reaches 1E level K3 classes.Cable
It is low-smoke halogen-free flame retardant, model 0.6/1kV three core power cables, its insulating barrier is crosslinked polyethylene material, safety etc.
Level reaches 1E level K3 classes.
Embodiment 3
The test that the present embodiment provides a kind of preprocess method of heat-shrink tube and obtained after being handled by the preprocess method
Sample.The preprocess method comprises the following steps：
S1. the cable of heat-shrink tube will be arranged with, in heating 5s on 500~600 DEG C of flame, obtains band pipe cable.
S2. it will be put into pipe cable in accelerator dolly and carry out crosslinking with radiation, dose of radiation 80KGy.
S3. the band pipe cable after crosslinking with radiation is stood into 24h, obtains required test sample.
Wherein, the main material of heat-shrink tube is crosslinked polyethylene and EP rubbers, and safe class reaches 1E level K3 classes.Cable
It is low-smoke halogen-free flame retardant, model 6.6/10kV three core power cables, its insulating barrier is crosslinked polyethylene/EP rubbers material
Matter, safe class reach 1E level K3 classes.
Embodiment 4
The test that the present embodiment provides a kind of preprocess method of heat-shrink tube and obtained after being handled by the preprocess method
Sample.The preprocess method comprises the following steps：
S1. the cable of heat-shrink tube will be arranged with, in heating 8s on 500~600 DEG C of flame, obtains band pipe cable.
S2. it will be put into pipe cable in accelerator dolly and carry out crosslinking with radiation, dose of radiation 70KGy.
S3. the band pipe cable after crosslinking with radiation is stood into 30h, obtains required test sample.
Wherein, the main material of heat-shrink tube is crosslinked polypropylene and EP rubbers, and safe class reaches 1E level K3 classes.Cable
It is low-smoke halogen-free flame retardant, model 6/6kV three core power cables, its insulating barrier is crosslinked polyethylene/EP rubbers material,
Safe class reaches 1E level K3 classes.
Embodiment 5
The test that the present embodiment provides a kind of preprocess method of heat-shrink tube and obtained after being handled by the preprocess method
Sample.The preprocess method comprises the following steps：
S1. the cable of heat-shrink tube will be arranged with, in heating 10s on 500~600 DEG C of flame, obtains band pipe cable.
S2. it will be put into pipe cable in accelerator dolly and carry out crosslinking with radiation, dose of radiation 90KGy.
S3. the band pipe cable after crosslinking with radiation is stood into 48h, obtains required test sample.
Wherein, the main material of heat-shrink tube is cross-linked ethylene-propylene acid methyl terpolymer and EP rubbers, and safe class reaches
To 1E level K2 classes.Cable is low-smoke halogen-free flame retardant, and model 8.7/10kV three core power cables, its insulating barrier is that crosslinking is poly-
Ethene/EP rubbers material, safe class reach 1E level K2 classes.
Embodiment 6
The test that the present embodiment provides a kind of preprocess method of heat-shrink tube and obtained after being handled by the preprocess method
Sample.The preprocess method comprises the following steps：
S1. the cable of heat-shrink tube will be arranged with, in heating 5s on 500~600 DEG C of flame, obtains band pipe cable.
S2. it will be put into pipe cable in accelerator dolly and carry out crosslinking with radiation, dose of radiation 100KGy.
S3. the band pipe cable after crosslinking with radiation is stood into 36h, obtains required test sample.
Wherein, the main material of heat-shrink tube is that cross-linked ethylene-acetic acid hexene copolymer and EP rubbers, safe class reach
1E level K2 classes.Cable is low-smoke halogen-free flame retardant, and model 6.6/10kV three core power cables, its insulating barrier is the poly- second of crosslinking
Alkene/EP rubbers material, safe class reach 1E level K2 classes.
Comparative example 1
The test that this comparative example provides a kind of preprocess method of heat-shrink tube and obtained after being handled by the preprocess method
Sample.The preprocess method comprises the following steps：
S1. the cable of heat-shrink tube will be arranged with, in heating 5s on 500~600 DEG C of flame, obtains band pipe cable.
S3. 24h will be stood with pipe cable, and will obtain required test sample.
Wherein, the main material of heat-shrink tube is crosslinked polyethylene and EP rubbers, and safe class reaches 1E level K1 classes.Cable
It is low-smoke halogen-free flame retardant, model 0.6/1kV single-core power cables, its insulating barrier is crosslinked polyethylene material, safety etc.
Level reaches 1E level K1 classes.
Comparative example 2
The test that this comparative example provides a kind of preprocess method of heat-shrink tube and obtained after being handled by the preprocess method
Sample.The preprocess method comprises the following steps：
S1. the cable of heat-shrink tube will be arranged with, in heating 5s on 500~600 DEG C of flame, obtains band pipe cable.
S2. it will be put into pipe cable in accelerator dolly and carry out crosslinking with radiation, dose of radiation 50KGy.
S3. the band pipe cable after crosslinking with radiation is stood 60 days, obtains required test sample.
Test example
The test sample provided using embodiment 1~6 and comparative example 1~2, thermo-oxidative ageing experiment is carried out, and count survey
The cracking situation of sample sheet, its specific method of testing and test result are as follows：
Using EJ/T705 " type approval test of npp safety cable and on-site cable connection ", IEC60216
“electrical insulating materials-thermal endurance properties-part 1:ageing
Procedures and evaluation of test results " and IEC60684-2 " Flexible insulating
sleeving Part 2:Method of testing in Methods of test " is tested, and each test sample prepares 20 parts of progress
Parallel test, result of the test are as shown in table 1：
The thermo-oxidative ageing test result of table 1.
As can be seen from Table 1, the test sample after the preprocess method of heat-shrink tube provided by the present invention is treated
In the thermo-oxidative ageing test of 50 days by a definite date, without cracking situation, the complete of thermo-oxidative ageing test is ensure that well
Property.And in comparative example 1, do not pre-processed using crosslinking with radiation, the situation for thering is sample to ftracture in 30 days, it splits
The ratio for opening sample is up to 20%.In comparative example 2, by the test sample of crosslinking with radiation processing, up to bimestrial preservation
Afterwards, it still is able to ensure good integrality in test process, in the test process of 50 days, the feelings of a cracking only occurs
Condition.
In summary, the invention provides a kind of preprocess method of heat-shrink tube, it makes shrinkable sleeve outside cable
Crosslinking with radiation is carried out into band pipe cable, and to band pipe cable.Inventor has found that heat-shrink tube is in thermo-oxidative ageing in long-term practice
Situation easily cracking in test, influence the process of test.And the main reason for causing cracking is the retraction force of heat-shrink tube
Too big, heat-shrink tube excessively bounces back.Inventor is had found, before thermo-oxidative ageing test is carried out, test sample is carried out at pre-irradiated
Reason, the degree of cross linking of heat-shrink tube can be increased, so as to play the purpose of limitation retraction, to improve the crack resistence performance of test sample,
Ensure its integrality in test process.
The application also for a kind of preprocess method of heat-shrink tube in the test of heat-shrink tube thermo-oxidative ageing of the present invention, by right
Test sample carries out the preprocess method, can ensure integrality of the test sample in the test of heat-shrink tube thermo-oxidative ageing well,
So as to greatly increase the success rate of test.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made any repaiies
Change, equivalent substitution, improvement etc., should be included in the scope of the protection.
Claims (10)
- A kind of 1. preprocess method of heat-shrink tube, it is characterised in that including：Shrinkable sleeve is made to band pipe cable outside cable, and the band pipe cable is subjected to crosslinking with radiation.
- 2. the preprocess method of heat-shrink tube according to claim 1, it is characterised in that radiated to the band pipe cable Dose of radiation during crosslinking is 50~100KGy.
- 3. the preprocess method of heat-shrink tube according to claim 1, it is characterised in that also include：After crosslinking with radiation The band pipe cable stands 24~48h at room temperature.
- 4. the preprocess method of heat-shrink tube according to claim 1, it is characterised in that the material of the heat-shrink tube is mainly wrapped Include cross-linked polyolefin and EP rubbers.
- 5. the preprocess method of heat-shrink tube according to claim 4, it is characterised in that the cross-linked polyolefin includes crosslinking In polyethylene, crosslinked polypropylene, cross-linked ethylene-propylene acid methyl terpolymer and cross-linked ethylene-acetic acid hexene copolymer at least It is a kind of.
- 6. the preprocess method of heat-shrink tube according to claim 5, it is characterised in that the heat-shrink tube is used in nuclear power station 1E Level K1~K3 type shrinkable tubes.
- 7. the preprocess method of heat-shrink tube according to claim 1, it is characterised in that the institute of the heat-shrink tube will be arranged with State cable 5~10s is heated at 500~600 DEG C and the band pipe cable is made.
- 8. the preprocess method of heat-shrink tube according to claim 7, it is characterised in that the process of the band pipe cable is made In, the shrinkage factor of the heat-shrink tube reaches 75%~85%.
- 9. the preprocess method of heat-shrink tube according to claim 1, it is characterised in that the cable be 0.6/1kV cables, Any of 6/6kV cables, 6.6/10kV cables and 8.7/10kV cables.
- 10. a kind of preprocess method of heat-shrink tube as described in any one of claim 1~9 is in the test of heat-shrink tube thermo-oxidative ageing Application.
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| CN201710637509.0A CN107505255A (en) | 2017-07-28 | 2017-07-28 | A kind of preprocess method of heat-shrink tube and its application |
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Application publication date: 20171222 |