CN107170528A - A kind of detection method of polyester-imide enamel covered wire baking degree - Google Patents
A kind of detection method of polyester-imide enamel covered wire baking degree Download PDFInfo
- Publication number
- CN107170528A CN107170528A CN201710328912.5A CN201710328912A CN107170528A CN 107170528 A CN107170528 A CN 107170528A CN 201710328912 A CN201710328912 A CN 201710328912A CN 107170528 A CN107170528 A CN 107170528A
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- Prior art keywords
- polyester
- covered wire
- imide
- enamel covered
- breakdown voltage
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/58—Testing of lines, cables or conductors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/58—Testing of lines, cables or conductors
- G01R31/59—Testing of lines, cables or conductors while the cable continuously passes the testing apparatus, e.g. during manufacture
Abstract
The invention provides a kind of detection method of polyester-imide enamel covered wire baking degree.The detection method comprises the following steps：1) preparation of polyester-imide enamel covered wire：Selection copper cash is conductor core wire, cleaned, annealing, drying process, is placed in baker by insulating polyester imines enamelled coating of polyester-imide paint and is coated on the copper cash, cooling of being come out of the stove after japanning, baking, and polyester-imide enamel covered wire is made；2) polyester-imide enamel covered wire is divided into the first polyester-imide enamel covered wire group and the second polyester-imide enamel covered wire group；First polyester-imide enamel covered wire group is subjected to breakdown voltage detection and obtains the first breakdown voltage；Second polyester-imide enamel covered wire group is placed in boiling water boil after taking-up is dried carry out breakdown voltage detection obtain the second breakdown voltage；Breakdown voltage declines within 2%, and it is qualified that obtained polyester-imide enamel covered wire baking degree is detected as.The detection method of the present invention is simple to operate, and the Detection accuracy of polyester-imide enamel covered wire baking degree is high.
Description
Technical field
The invention belongs to enamel-covered wire technical field, it is related to a kind of detection method of polyester-imide enamel covered wire baking degree.
Background technology
Electric insulation is the most important part of electrical equipment and electrical, in addition to insulating process and structure design, electrically
In itself, including the quality of enamel-covered wire is to directly affect electrical equipment and electrical reliability and the key in life-span to insulating materials, and enamel-covered wire is electricity
The main raw material(s) of the products such as mechanical, electrical device and household electrical appliance, particularly power industry in recent years, which is realized, maintains sustained and rapid growth, family
Electrical appliance is developed rapidly, and the application to enamel-covered wire brings broader field, the thing followed is that enamel-covered wire is proposed more
High requirement.Not enough, and enamel-covered wire is during storage and use for baking degree too low enamel-covered wire curing degree, if environment
Humidity, the enamel-covered wire moisture absorption deterioration that curing degree can be enable inadequate causes its relatively low proof voltage, draftability and pin hole not
It is qualified, and then influence the mechanical performance and electric property of enamel-covered wire.
The inherent quality of enamel-covered wire can be analyzed, controlled using dielectric analysis method, be to promote home products to mount to be born in state
The important channel in border market.Enameled wire coat film forming is a high molecular crosslink course of reaction, and it is relevant with the extent of reaction, namely
The curing degree of paint film, before reaction reaches to a certain degree, the curing degree of paint film is slowly being improved, the increase of paint film crosslinking points, molecule
Amount increase, glass transition temperature also increases, and therefore, enamel solidity is relevant with glass transition temperature.When paint film is heated, in glassy state
Limited proportionality dielectric loss tg δ undergo mutation (become big), (the i.e. glass of corresponding temperature when can obtain generation mutation by tangential method
Glass temperature), so, can use tg δ and glass transition temperature Tg relation, the curing degree of indirect analysis paint film, here it is with
Dielectric loss analyzes the mechanism of enamel solidity.Current dielectric analysis method is that dielectric tangent constant test method can be detected
Paint film baking degree, but the error of such a method of testing device therefor is big.
The content of the invention
In view of the shortcomings of the prior art, it is an object of the invention to provide a kind of inspection of polyester-imide enamel covered wire baking degree
Survey method, the detection method is simple to operate, and the Detection accuracy of polyester-imide enamel covered wire baking degree is high.
For up to this purpose, the present invention uses following technical scheme：
A kind of detection method of polyester-imide enamel covered wire baking degree, comprises the following steps：
1) preparation of polyester-imide enamel covered wire：Selection copper cash is conductor core wire, cleaned, annealing, drying process, is placed in
The copper cash is coated on by insulating polyester imines enamelled coating of polyester-imide paint in baker, cooling of being come out of the stove after japanning, baking is made
Polyester-imide enamel covered wire；
2) by step 1) made from polyester-imide enamel covered wire be divided into the first polyester-imide enamel covered wire group and the second polyester
Imines enamel covered wire group；First polyester-imide enamel covered wire group is subjected to breakdown voltage detection, the first breakdown voltage is obtained；By
Dimer ester imines enamel covered wire group, which is placed in boiling water, boils, and taking-up carries out breakdown voltage detection and obtains the second breakdown potential after drying
Pressure；
Second breakdown voltage declines within 2% compared to first breakdown voltage, the obtained polyester-imide
It is qualified that enamel covered wire baking degree is detected as；
Second breakdown voltage declines compared to first breakdown voltage is more than 2%, the obtained polyester-imide
Enamel covered wire baking degree is detected as unqualified.
In the presence of highfield, the electronics of constraint can be changed into free electricity from acquisition energy in electric field in high polymer
Son, is moved by direction of an electric field.In motion during the other bound electronics of free-electron collision, them are excited to turn into freely electricity again
Son, such free electron is more and more, improves the electric conductivity of high polymer.When electric-field intensity exceedes certain certain numerical value,
One is formed in high polymer and joined two interelectrode ducts, makes just in enhanced electric current wherein to pass through, high polymer is just
Lose insulating properties and breakdown.At this moment alive intensity referred to as breakdown voltage is applied.The heat brought in voltage breakdown
Amount can make high polymer produce heat damage, and the phenomenon that fusing is burnt is presented.The present invention is by will be by the first polyester-imide enamel-cover copper
Line group carries out breakdown voltage detection, obtains the first breakdown voltage；Second polyester-imide enamel covered wire group is placed in boiling water and boiled,
Accelerate moisture absorption deterioration, taking-up to carry out breakdown voltage detection after drying and obtain the second breakdown voltage, compare two groups of breakdown voltages, pass through
Whether rate of descent examines the baking degree of obtained polyester-imide enamel covered wire qualified.Long-term warehouse is placed but moisture absorption does not occur
Such enamel-covered wire of deterioration, the contrast of the experiment is carried out with the verified wire rod that can occur moisture absorption deterioration but not yet deteriorate, and
Multigroup sample is taken to compare, so as to show that " breakdown voltage declines within 2%, obtained polyester-imide enamel covered wire baking degree inspection
Survey to be qualified " conclusion.
Step 1) in, a diameter of 0.1~0.5mm of the copper cash, such as 0.1mm, 0.15mm, 0.2mm, 0.25mm,
0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, the thickness of the insulating polyester imines enamelled coating is 0.01~0.05mm, for example
0.01mm、0.02mm、0.03mm、0.04mm、0.05mm。
Step 1) in, the process of the cleaning is：The copper cash is placed in 50~60 DEG C of pure water and cleaned 2~3 times.
Step 1) in, the process of the drying is that the copper cash after annealing is placed in into flash baking surface in drying baker
Moisture.
Stoving temperature is too high or too low all to cause thermal shock resistance properties to decline, so the temperature bakeed should be controlled strictly.Step
1) in, the temperature of the baker is specifically configured to：Inlet temperature be 400~450 DEG C, for example, 400 DEG C, 410 DEG C, 420 DEG C,
430℃、440℃、450℃；Central temperature is 450~480 DEG C, for example, 450 DEG C, 460 DEG C, 470 DEG C, 480 DEG C；Outlet temperature
For 480~520 DEG C, for example, 480 DEG C, 490 DEG C, 500 DEG C, 510 DEG C, 520 DEG C.Preferably, the inlet temperature is 440 DEG C,
The central temperature is 470 DEG C, and the outlet temperature is 500 DEG C.
Step 1) in, the process of the japanning is that the polyester-imide paint is coated on into the copper cash, repeatedly coat 5~
10 times, often coat and once bakee afterwards once.
Step 1) in, linear velocity in the baking process is 60~100m/min, for example, 60m/min, 70m/min,
80m/min、90m/min、100m/min。
Step 2) in, it is 20~40min that the second polyester-imide enamel covered wire group is placed in the time boiled in boiling water, for example
For 20min, 22min, 25min, 26min, 28min, 30min, 32min, 35min, 38min, 40min.
As the preferred scheme of the present invention, the detection method of polyester-imide enamel covered wire baking degree comprises the following steps：
1) preparation of polyester-imide enamel covered wire：Selection copper cash is conductor core wire, and the copper cash is placed in into 50~60 DEG C
Cleaned 2~3 times in pure water, annealing, the copper cash after annealed processing is placed in the moisture on flash baking surface in drying baker,
It is placed in baker by insulating polyester imines enamelled coating of polyester-imide paint and is coated on the copper cash, the temperature of the baker is specifically set
For：Inlet temperature is 400~450 DEG C, and central temperature is 450~480 DEG C, and outlet temperature is 480~520 DEG C, through japanning, is bakeed
After come out of the stove cooling, the process of the japanning is that the polyester-imide paint is coated on into the copper cash, coats 5~10 times repeatedly, often
Coating is once bakeed once afterwards, and the linear velocity in the baking process is that polyester-imide enamel covered wire is made in 60~100m/min；
2) by step 1) made from polyester-imide enamel covered wire be divided into the first polyester-imide enamel covered wire group and the second polyester
Imines enamel covered wire group；First polyester-imide enamel covered wire group is subjected to breakdown voltage detection, the first breakdown voltage is obtained；By
Dimer ester imines enamel covered wire group, which is placed in boiling water, boils 20~40min, and taking-up carries out breakdown voltage detection and obtains the after drying
Two breakdown voltages；Second breakdown voltage declines within 2% compared to first breakdown voltage, and the obtained polyester is sub-
It is qualified that amine enamel covered wire baking degree is detected as；Second breakdown voltage declines compared to first breakdown voltage is more than 2%,
The obtained polyester-imide enamel covered wire baking degree is detected as unqualified.
Compared with prior art, beneficial effects of the present invention are：The inspection of the polyester-imide enamel covered wire baking degree of the present invention
Survey method, simple to operate, the Detection accuracy of polyester-imide enamel covered wire baking degree is high, and the second breakdown voltage is hit compared to first
Wear voltage to decline within 2%, it is qualified that obtained polyester-imide enamel covered wire baking degree is detected as；Second breakdown voltage is compared to
One breakdown voltage, which declines, is more than 2%, and obtained polyester-imide enamel covered wire baking degree is detected as unqualified.
Embodiment
Technical scheme is further illustrated below by embodiment.
Unless specific instructions, various raw materials of the invention are commercially available buys, or is prepared according to the conventional method of this area
Obtain.
Embodiment 1
1) preparation of polyester-imide enamel covered wire：Selection copper cash is conductor core wire, and the copper cash is placed in into 50 DEG C pure
Cleaned 2~3 times in water, annealing, the copper cash after annealed processing is placed in the moisture on flash baking surface in drying baker, is placed in
The copper cash is coated on by insulating polyester imines enamelled coating of polyester-imide paint in baker, the temperature of the baker is specifically configured to：
Inlet temperature is 440 DEG C, and central temperature is 470 DEG C, and outlet temperature is 500 DEG C, cooling of being come out of the stove after japanning, baking, described to apply
The process of paint is that the polyester-imide paint is coated on into the copper cash, coats 5~10 times repeatedly, often coats and once bakee one afterwards
Secondary, polyester-imide enamel covered wire is made for 75m/min in the linear velocity in the baking process；A diameter of 0.1mm of copper cash, it is described
The thickness of insulating polyester imines enamelled coating is 0.02mm.
2) by step 1) made from polyester-imide enamel covered wire be divided into the first polyester-imide enamel covered wire group and the second polyester
Imines enamel covered wire group；First polyester-imide enamel covered wire group is subjected to breakdown voltage detection, the first breakdown voltage is obtained；By
Dimer ester imines enamel covered wire group, which is placed in boiling water, boils 20min, and taking-up carries out breakdown voltage and detects that obtaining second hits after drying
Wear voltage.
Embodiment 2
1) preparation of polyester-imide enamel covered wire：Selection copper cash is conductor core wire, and the copper cash is placed in into 60 DEG C pure
Cleaned 2~3 times in water, annealing, the copper cash after annealed processing is placed in the moisture on flash baking surface in drying baker, is placed in
The copper cash is coated on by insulating polyester imines enamelled coating of polyester-imide paint in baker, the temperature of the baker is specifically configured to：
Inlet temperature is 440 DEG C, and central temperature is 470 DEG C, and outlet temperature is 500 DEG C, cooling of being come out of the stove after japanning, baking, described to apply
The process of paint is that the polyester-imide paint is coated on into the copper cash, coats 5~10 times repeatedly, often coats and once bakee one afterwards
Secondary, polyester-imide enamel covered wire is made for 69m/min in the linear velocity in the baking process；A diameter of 0.2mm of copper cash, it is described
The thickness of insulating polyester imines enamelled coating is 0.02mm.
2) by step 1) made from polyester-imide enamel covered wire be divided into the first polyester-imide enamel covered wire group and the second polyester
Imines enamel covered wire group；First polyester-imide enamel covered wire group is subjected to breakdown voltage detection, the first breakdown voltage is obtained；By
Dimer ester imines enamel covered wire group, which is placed in boiling water, boils 30min, and taking-up carries out breakdown voltage and detects that obtaining second hits after drying
Wear voltage.
Embodiment 3
1) preparation of polyester-imide enamel covered wire：Selection copper cash is conductor core wire, and the copper cash is placed in into 55 DEG C pure
Cleaned 2~3 times in water, annealing, the copper cash after annealed processing is placed in the moisture on flash baking surface in drying baker, is placed in
The copper cash is coated on by insulating polyester imines enamelled coating of polyester-imide paint in baker, the temperature of the baker is specifically configured to：
Inlet temperature is 440 DEG C, and central temperature is 470 DEG C, and outlet temperature is 500 DEG C, cooling of being come out of the stove after japanning, baking, described to apply
The process of paint is that the polyester-imide paint is coated on into the copper cash, coats 5~10 times repeatedly, often coats and once bakee one afterwards
Secondary, polyester-imide enamel covered wire is made for 90m/min in the linear velocity in the baking process；A diameter of 0.3mm of copper cash, it is described
The thickness of insulating polyester imines enamelled coating is 0.05mm.
2) by step 1) made from polyester-imide enamel covered wire be divided into the first polyester-imide enamel covered wire group and the second polyester
Imines enamel covered wire group；First polyester-imide enamel covered wire group is subjected to breakdown voltage detection, the first breakdown voltage is obtained；By
Dimer ester imines enamel covered wire group, which is placed in boiling water, boils 40min, and taking-up carries out breakdown voltage and detects that obtaining second hits after drying
Wear voltage.
Wherein, in embodiment 1-3, the first polyester-imide enamel covered wire group and the second polyester-imide enamel covered wire group are used
5 samples, measure the first breakdown voltage and the second breakdown voltage, experimental result is as shown in table 1-3.
Table 1
Table 2
Table 3
By embodiment 1 it can be seen from table 1-3 data and polyester-imide enamel covered wire made from embodiment 2 through boiling water water
Breakdown voltage rate of change after boiling is qualified polyester-imide enamel covered wire baking degree within 2%, is gathered made from embodiment 3
Ester imines enamel covered wire, preparation process centerline velocities are too fast, and baking degree is not enough, and the breakdown voltage range of decrease after being boiled through boiling water water is big,
Rate of change is -25.83%, is underproof polyester-imide enamel covered wire baking degree.
Applicant states that the present invention illustrates detailed process equipment and the technological process of the present invention by above-described embodiment,
But the invention is not limited in above-mentioned detailed process equipment and technological process, that is, do not mean that the present invention has to rely on above-mentioned detailed
Process equipment and technological process could be implemented.Person of ordinary skill in the field it will be clearly understood that any improvement in the present invention,
Addition, selection of concrete mode of equivalence replacement and auxiliary element to each raw material of product of the present invention etc., all fall within the present invention's
Within the scope of protection domain and disclosure.
Claims (10)
1. a kind of detection method of polyester-imide enamel covered wire baking degree, it is characterised in that comprise the following steps：
1) preparation of polyester-imide enamel covered wire：Selection copper cash is conductor core wire, cleaned, annealing, drying process, is placed in baker
In be coated on the copper cash by insulating polyester imines enamelled coating of polyester-imide paint, through japanning, bakee after come out of the stove cooling, obtained polyester
Imines enamel covered wire；
2) by step 1) made from polyester-imide enamel covered wire be divided into the first polyester-imide enamel covered wire group and the second polyester-imide
Enamel covered wire group；First polyester-imide enamel covered wire group is subjected to breakdown voltage detection, the first breakdown voltage is obtained；Second is gathered
Ester imines enamel covered wire group, which is placed in boiling water, boils, and taking-up carries out breakdown voltage detection and obtains the second breakdown voltage after drying；
Second breakdown voltage declines within 2% compared to first breakdown voltage, the obtained polyester-imide enamel-cover
It is qualified that copper cash baking degree is detected as；
Second breakdown voltage declines compared to first breakdown voltage is more than 2%, the obtained polyester-imide enamel-cover
Copper cash baking degree is detected as unqualified.
2. detection method according to claim 1, it is characterised in that step 1) in, the copper cash a diameter of 0.1~
0.5mm, the thickness of the insulating polyester imines enamelled coating is 0.01~0.05mm.
3. detection method according to claim 1 or 2, it is characterised in that step 1) in, the process of the cleaning is：Will
The copper cash is placed in 50~60 DEG C of pure water and cleaned 2~3 times.
4. the detection method according to one of claim 1-3, it is characterised in that step 1) in, the process of the drying is,
Copper cash after annealing is placed in the moisture on flash baking surface in drying baker.
5. the detection method according to one of claim 1-4, it is characterised in that step 1) in, the temperature tool of the baker
Body is set to：Inlet temperature is 400~450 DEG C, and central temperature is 450~480 DEG C, and outlet temperature is 480~520 DEG C.
6. detection method according to claim 5, it is characterised in that the inlet temperature is 440 DEG C, the central temperature
For 470 DEG C, the outlet temperature is 500 DEG C.
7. the detection method according to one of claim 1-6, it is characterised in that step 1) in, the process of the japanning is,
The polyester-imide paint is coated on the copper cash, is coated 5~10 times repeatedly, is often coated and once bakee afterwards once.
8. the detection method according to one of claim 1-7, it is characterised in that step 1) in, in the baking process
Linear velocity is 60~100m/min.
9. the detection method according to one of claim 1-8, it is characterised in that step 2) in, by the second polyester-imide paint
It is 20~40min that copper-clad line group, which is placed in time for being boiled in boiling water,.
10. the detection method according to one of claim 1-8, it is characterised in that comprise the following steps：
1) preparation of polyester-imide enamel covered wire：Selection copper cash is conductor core wire, and the copper cash is placed in into 50~60 DEG C pure
Cleaned 2~3 times in water, annealing, the copper cash after annealed processing is placed in the moisture on flash baking surface in drying baker, is placed in
The copper cash is coated on by insulating polyester imines enamelled coating of polyester-imide paint in baker, the temperature of the baker is specifically configured to：
Inlet temperature is 400~450 DEG C, and central temperature is 450~480 DEG C, and outlet temperature is 480~520 DEG C, after japanning, bakeing
Come out of the stove cooling, the process of the japanning is that the polyester-imide paint is coated on into the copper cash, coat 5~10 times, often apply repeatedly
Cover and once bakee afterwards once, the linear velocity in the baking process is that polyester-imide enamel covered wire is made in 60~100m/min；
2) by step 1) made from polyester-imide enamel covered wire be divided into the first polyester-imide enamel covered wire group and the second polyester-imide
Enamel covered wire group；First polyester-imide enamel covered wire group is subjected to breakdown voltage detection, the first breakdown voltage is obtained；Second is gathered
Ester imines enamel covered wire group, which is placed in boiling water, boils 20~40min, and taking-up carries out breakdown voltage and detects that obtaining second hits after drying
Wear voltage；
Second breakdown voltage declines within 2% compared to first breakdown voltage, the obtained polyester-imide enamel-cover
It is qualified that copper cash baking degree is detected as；
Second breakdown voltage declines compared to first breakdown voltage is more than 2%, the obtained polyester-imide enamel-cover
Copper cash baking degree is detected as unqualified.
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| CN201710328912.5A CN107170528A (en) | 2017-05-11 | 2017-05-11 | A kind of detection method of polyester-imide enamel covered wire baking degree |
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| CN201710328912.5A CN107170528A (en) | 2017-05-11 | 2017-05-11 | A kind of detection method of polyester-imide enamel covered wire baking degree |
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| JPS649360A (en) * | 1987-07-01 | 1989-01-12 | Yaskawa Denki Seisakusho Kk | Defect detecting method of winding of rotary machine |
| EP0770880A2 (en) * | 1995-10-26 | 1997-05-02 | Siemens Aktiengesellschaft | Means for testing the isolation of windings |
| CN101026027A (en) * | 2006-02-17 | 2007-08-29 | 上海中马电磁线有限公司 | Polyimideenamelling round copper wire deposition process |
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