CN1089777C - Polyester film for electrical insulation - Google Patents
Polyester film for electrical insulation Download PDFInfo
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- CN1089777C CN1089777C CN97180964A CN97180964A CN1089777C CN 1089777 C CN1089777 C CN 1089777C CN 97180964 A CN97180964 A CN 97180964A CN 97180964 A CN97180964 A CN 97180964A CN 1089777 C CN1089777 C CN 1089777C
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Abstract
The present invention relates to a polyester film used for electric insulation. The present invention is characterized in that the apparent density of the film is from 1.37 to 0.85 g/cm<3>, and the modulus of elasticity in direct stress is from 2.0 to 4.5 GPa. The prepared film has the advantages of less oligomer content, low cost, high heat resistance, high impact resistance, excellent forming properties, high assembling stability, and good identity; in addition, when the present invention is used for the insulation of a motor, the present invention has effect of reducing leakage current.
Description
Invention field
The present invention relates to polyester film and laminate film that electrical isolation is used.Relate to the insulation of motor on the compressor that refrigeration plants such as cooled machine and air conditioning machinery use and polyester film and the laminate film that various electrical apparatus insulation is used in more detail, its objective is the minimizing oligomer, the identification of the stability of raising assembling back device, dyed device feature, forming process etc. and minimizing are leaked electricity.
Background of invention
Past, take the method for the high polyester film of service performance viscosity to reduce the content of oligopolymer, in addition, take to use the method for end closure agent to improve the anti-hydrolytic performance of polyester film.
Have again, in order to satisfy above-mentioned two characteristics simultaneously, though also can take to use the method for various heat-resistant film,, variety of issue such as have that cost rises, stability, the forming process of the device after device assembling difficulty and the assembling are bad.
Announced porose, specific inductivity plastic insulation film below particular value, thermotolerance, low-k in the Te Kaiping 9-100363 communique.The purpose of this film exploitation is in order to reduce leakage current loss and to carry out low-kization at the insulated part of following the instrument high frequencyization, as electrically insulating material the time, there is not consideration to use problems the such as whether assembling of oligopolymer and device makes things convenient for less, so there is not practicality.In addition, open in the flat 5-194773 communique the spy and to have announced polyester film, be not used in the electrical isolation aspect but discuss with specific apparent density and modulus of elasticity in direct stress.
In the film that these electrical isolations are used, there is following problem.
(1) from the global environment problem consider will be with the little cooling agent of environmental pollution, use the oils media instead, in order to reach these purposes, so wish to reduce the oligopolymer consumption.
(2) in the device of above-mentioned cooling agent, if use heat-resistant film separately, cost is just high.
When (3) being used in aspect such as motor insulation, the stability after forming process (thermoforming, lancing moulding), the device assembling (slide, shakiness), visibility etc. are bad.
(4) owing to changing cooling agent, oil product, causing electric leakage to increase.
Addressing these problems is purpose of the present invention.
Summary of the invention
The invention provides the polyester film that electrical isolation is used, it is characterized in that, the apparent density of film is 1.37～0.85g/cm
3, the modulus of elasticity in direct stress is 2.0～4.5GPa.In addition, provide that to have These characteristics and specific inductivity be the polyester film that 2.2～3.0 electrical isolation is used.
The laminate film that the present invention also provides a kind of electrical isolation to use is characterized in that, at least one face of above-mentioned polyester film, and the film that laminated thermotolerance is not worse than polyester film.
In addition, the present invention also provides a kind of seal, in this seal, at the cooling agent of making principal constituent with the halohydrocarbon of partial hydrogenation and having under the atmosphere of polar oil product, the laminate film that uses polyester film that this electrical isolation uses and electrical isolation to use carries out electrical isolation, the present invention also provides a kind of hermetic compressor that motor is housed, and uses the excitatory coil of using of above-mentioned seal insulation in this motor.The preferred embodiment of invention
Used polyester is meant the thermoplastic resin composition of the polymer crystallization that obtains through esterification in the polyester film of the present invention, and this polyester is made through polycondensation by dicarboxylic acid component and diol component.
Can use terephthalic acid as the dicarboxylic acid component, m-phthalic acid, naphthalene dicarboxylic acids, cyclohexane cyclohexanedimethanodibasic, diphenylethane dicarboxylic acid etc., but as diol component spent glycol, propylene glycol, 1,4-butyleneglycol, cyclohexanedimethanol etc.In them as sour composition, with terephthalic acid, naphthalene-2, the 6-dioctyl phthalate be good, as glycol component, be good with ethylene glycol, propylene glycol.
As the fusing point of this polyester, consider from thermotolerance, with more than 250 ℃ be good, consider from the productivity aspect, being good below 300 ℃.Poly terephthalic acid diethyl ester, poly-naphthalene-2,6-dioctyl phthalate ethyl ester, poly terephthalic acid-1,4-hexanaphthene dimethyl ester, poly terephthalic acid dipropyl etc. are arranged as this ideal polyester is specifiable.From characteristic, the cost consideration of weighing them, wherein, poly terephthalic acid diethyl ester and poly-naphthalene-2,6-dioctyl phthalate ethyl ester is the most desirable.But also copolymerization in these polymkeric substance, mix other component.
Constitute the polyester of polyester film of the present invention, its limiting viscosity [η] with 0.6～1.5dl/g for well, with 0.7～1.4dl/g serve as better, serve as special good with 0.8～1.3dl/g.If the not enough 0.6dl/g of limiting viscosity [η], the amount of oligopolymer is just too many, just should not be used in the electrical isolation aspect sometimes, in addition, also can go wrong sometimes aspect long-term heat resistance.If limiting viscosity [η] surpasses 1.5dl/g, then because of viscosity is too high, so the phenomenon of formability variation is arranged.
In addition, the M/P of this polyester with below 1.8 for well, more preferably below 1.4, be preferably below 1.2, particularly preferably below 1, the insulation resistance of polyester under normal temperature and high temperature will improve like this, and be very desirable.Here, M/P represents to remove after the polymerization catalyst, all metallic elements (M) in the polymkeric substance and the mol ratio of phosphoric (P).
Polyester film of the present invention is a biaxial stretching film, so mechanical property, thermal characteristics, electrical property, forming process, apparent density are good.
The apparent density of polyester film for electrical insulation of the present invention needs at 1.37～0.85g/cm
3Scope in, with 1.3～0.9g/cm
3For good, with 1.2～0.9g/cm
3For better.Surpass 1.37g/cm
3The time, will produce problems such as oligomer increases, forming process difficulty, leakage current increase.Apparent density is done hour, though the reason that oligomer reduces is not clear, can infer this be since the inner hole that forms around or along the effects such as concentrated, deviation of the oligopolymer of inwall, reduced the content of apparent oligopolymer.Also have, little by apparent density is done, when using the film of same thickness, just can reduce the consumption of polyester, also can see the effect of the absolute value minimizing of oligomer.But when even just apparent density is low, the content that also not necessarily is only limited to oligopolymer reduces, and is also very important with the relation of Y/D described later.In addition, not enough 0.85g/cm
3The time, physical strength, shock-resistance are just not enough, for example, when being installed in it around exciting coil of motor (wedge and liner), can fracture after the installation, go wrong in the reality use.Ratio by the inner hole that forms of controlling diaphragm can be made in apparent density in this scope.
Have, the modulus of elasticity in direct stress of polyester film for electrical insulation of the present invention must be in the scope of 2.0～4.5GPa again.Better in the scope of 2.5～4.5GPa, be preferably in the scope of 3.0～4.5GPa.If the not enough 2.0GPa of the modulus of elasticity in direct stress, film are just stiffening, for example, when being installed in it around exciting coil of motor, the problem that will occur fractureing.If the modulus of elasticity in direct stress surpasses 4.5GPa, then stiffness is excessive, so, it is crooked or when making its crooked installation, its form retentivity variation, becoming difficulty of operation.The modulus of elasticity in direct stress is made in this scope, and the ratio of available control fenestra and the method for stretching condition reach.
Also has the apparent density D (g/cm of polyester film for electrical insulation of the present invention
3) and the relation of modulus of elasticity in direct stress Y (GPa), be good with 2.5＜Y/D＜4.Y/D is big, is related to orientation fully, and since oriented crystalline turn into making the oligomer minimizing, thereby thermotolerance is improved.That is to say, if Y/D below 2.5, the content of oligopolymer or thermotolerance will go wrong.If but Y/D is more than 4, easily break when then film stretches, so the system film properties can go wrong.
Below, just an example of manufacture method of the present invention describes.
At first, in aforesaid polyester, add incompatible polymers or micropartical, it is supplied with forcing machine, extrude, form sheet through T pattern head.This sheet is heated to more than the second-order transition temperature of polyester, toward longitudinal stretching.Both sides and tension with clip is clamped this film are heated to more than the second-order transition temperature, toward stretching with vertical vertical direction (fabric width direction), through continuing the polyester film that thermal treatment (on demand, also can be in the fabric width direction, vertically on loose) makes two-way stretch.
Above-mentioned non-intermiscibility polymkeric substance and micropartical are as long as it is just passable to make the apparent density of wanting required for the present invention.Object lesson as the non-polymkeric substance that mixes can be used polyethylene, polypropylene, polybutene, polymethylpentene etc.In addition, it is homopolymer that these polymkeric substance do not limit yet, and is that their multipolymer is also passable.Wherein, the polyolefine that critical surface tension is little, specific inductivity is little is relatively good, and polypropylene and polymethylpentene etc. are because of reducing apparent density, good heat resistance, reduction leakage current etc., so more satisfactory.
These incompatible polymers exist with granular in polyester.In order to control its particle diameter, can add expanding material, for example, polyalkylene glycol or its multipolymer etc. more particularly can be used polyoxyethylene glycol and polypropylene glycol etc.Though also can be by tensio-active agent with its miniaturization,, must not cause within the scope that electrical property degenerates.
As atomic object lesson, organic filler and inorganic particulate can be used, polysiloxane particle, polyimide particle, crosslinked styrene diethylene benzene copoly mer particle, crosslinked polyester granules, " special teflon " (registrar entitling) particle etc. can be used as the object lesson of organic filler.As inorganic particulate, can enumerate as lime carbonate and silicon-dioxide, barium sulfate etc.The occasion of particulate does not use tensio-active agent etc. for well.
Secondly, as the method for in polyester, adding, though have no particular limits, but, when using the non-polymkeric substance that mixes, make mixture with vibrin in advance, then with its supply system film forcing machine for well, though mix the supply system film forcing machine with vibrin also passable,, the reduction of the limiting viscosity [η] that causes because of thermal degradation when for fear of vibrin, used hybrid system, particularly consider the problem at slope of repose, at firm the supply system film forcing machine, best with regard to force to carry out the blended method with the method for machinery at once.
In addition, use atomic the time, be added at polymerization stage.Specifically, add method in the ethylene glycol to for well.When adding calcium carbonate particles, add phosphorus compound, this is more satisfactory to preventing xanthochromia and blowing ratio.
Though the thickness of polyester film of the present invention has no particular limits, still, in order to take into account two aspects of insulating property and transaction capabilities, the thickness of suitable motor insulation usefulness is relatively good in 25～350 mu m ranges, is preferably in the scope of 50～250 μ m.
Polyester film of the present invention is unitary film not necessarily, with the multilayered structure formed by counterdie and the top layer that on its side surface, is provided with at least for well.The top layer is arranged on the both side surface of counterdie, and is better to suppressing curling of film.The apparent density on top layer is bigger than the apparent density of counterdie, and during from physical strength, shock-resistance, installation (wedge and liner), the aspect that prevents to fracture is seen more satisfactory.The film of this multilayered structure constitutes counterdie, the limiting viscosity of the vibrin on top layer with 0.6～1.5dl/g for well.In addition, two-layer all based on polyethylene terephthalate or all with poly-naphthalene-2,6-dioctyl phthalate second diester is good as main body.Secondly, the apparent density D (g/cm of film
3) and the relation of modulus of elasticity in direct stress Y (GPa) be good also with 2.5＜Y/D＜4.Its reason as mentioned above.In the time of multilayer film, operation aspect during from physical strength, shock-resistance, installation considers, the thickness on top layer be whole thickness 5～50% for well.When multilayer film of the present invention prepares, be by will constituting the vibrin fusing on counterdie and top layer, and converge before extruding from mould and extrude, and carry out two-way stretch after the cooling, this is good peeling off at the interface to preventing counterdie and top layer.The vibrin that constitutes counterdie is to contain the non-polymkeric substance that mixes or atomic relatively good in aforesaid vibrin, and what particularly contain polypropylene and polymethylpentene etc. is polyolefinic for well.
The laminate film that the present invention also provides electrical isolation to use is characterized in that, at least one face of the polyester film of the invention described above, and the laminated thermotolerance film not worse than this polyester film, particularly, the apparent density of its laminate film is 1.37～0.85g/cm
3, the modulus of elasticity in direct stress is 2.5～5.0GPa.By laminated thermotolerance film, film can be used in the demanding aspect of thermotolerance.Film of laminated good heat resistance all on the two sides of polyester film is to thermotolerance, mechanical property will be better.
As polyester film and the combination of the film of laminated good heat resistance on this polyester film, under the situation of identical polyester, the film of good heat resistance will be with having the more polyester of high inherent viscosity [η], under the situation of polyester of the same race not, be the polyester of main body in order to polyethylene terephthalate with Polyethylene Naphthalate or based on the polyester combination of polyphenylene sulfide, also having in order to Polyethylene Naphthalate is the polyester of main body and with polyphenylene sulfide or better based on the combination of the polyester of aromatic polyimide etc.
The limiting viscosity [η] of the vibrin of these laminate films part with 0.6～1.5dl/g for well.
In addition, the apparent density D (g/cm of these laminate films
3) and the relation of modulus of elasticity in direct stress Y (GPa), with 3.0＜Y/D＜4.5 for well.Its reason is also as described above.
It is as on the seal of electrical isolation under the cooling agent of principal constituent and the atmosphere of mixture that the polar oil product is arranged that polyester film of the present invention and laminate film can perform well at the halocarbon with partial hydrogenation.Be the cooling agent of principal constituent and have under the atmosphere of mixture of polarity oil product particularly that can perform well in motor in the hermetic type compressor, excitation is with in the insulation of coil at halocarbon with partial hydrogenation.
For this purpose, the specific inductivity of polyester film for electrical insulation of the present invention with 2.2～3.0 for good, with 2.4～3.0 for better, be preferably 2.5～3.0.In addition, electrical isolation of the present invention with the specific inductivity of laminate film with 2.4～3.0 be good, with 2.6～3.0 for better, if specific inductivity is too big, then leakage current is just big, and instrument just can not be used safely, if specific inductivity is too little, just can not take into account mechanical property, so impracticable.
At present, in order to solve the problem of the depletion of the ozone layer that causes because of Flon gas, according to so-called " Montreal Agreement book ", people are developing the substitute of Flon and to full capacity with refrigeration, the air-conditioner device of Flon substitute, at this moment, concerning the past fully by the halogenated halocarbon, the cooling agent that will be replaced by hydrogen, promptly so-called Flon substitute with the part of halogen.The Flon substitute replaces halogen atom to connect hydrogen, because of having polarity, so original nonpolarity mineral oil and alkyl benzene oil indissoluble are separated, and use difficulty, could use and will have polar oil to cooperate with it with polyester polyol, polyalkylene glycol, carbonic ether, ether, fluorochemical etc.In these mixture atmosphere, when using polyester film in the past, worry that the electric capacity of the seal that the raising because of specific inductivity that polar oil is arranged causes increases especially, and then make the leakage current increase.When being used in polyester film of the present invention and laminate film on the seal, because leakage current reduces, so can seek the raising of security, reliability.The excitation that particularly is used in the motor that uses in the hermetic type compressor is during with the insulation around the coil, and effect is fine.[rerum natura and Evaluation on effect method] (1) apparent density
Claim (grinding Seiko industry (strain) system SD-120L) to measure with electromagnetism.(2) limiting viscosity [η]
Under 105 ℃, with sample drying after 20 minutes, claim 6.8 ± 0.005g in ortho chloro phenol, under 160 ℃, stir and made its dissolving in 15 minutes.After the cooling, the viscosity under the automatic viscosity determinator of usefulness ャ マ ト ラ ボ テ Star Network (strain) AVM-10S type is measured 25 ℃.(3) amount of oligopolymer
As cooling agent R407C (AC 9000, CH
2F
2: CF
3CHF
2: CF
3CH
2F=23: 25: 52), as oil with polyester polyol oil (VG 32), sample is put into 150 ℃, 35kg/cm
2Pressure kettle in, handled 1000 hours, the amount of the oligopolymer in oil/cooling agent (cyclic trimer) is asked for liquid chromatography, with the ratio with respect to sample size, does following judgement.
0.6 more than the weight %: X
0.35 below the weight %: zero
Its intermediate quantity: △ (4) impact-resistance
With thickness is the size that the membrane sample of 250 μ m is cut into 10cm * 20cm, do one side of 20cm circular, the side of 10cm is fixed on the Pressure sensitive adhesive tape, make drum, cylinder is placed on the flat board, another flat board is placed on above the cylinder, the situation of damaging by pressure during negative load 10kg is carried out following judgement again.
Zero: shape there is not variation fully
△: though partial deformation is arranged, but still be shape
*: all squeezed ring (5) leakage current
Membrane sample is done lining and wedge, be contained in the motor, cooling agent, the oil of pack into AC 9000 and VG 32 are measured leakage current, carry out following judgement.
Zero: leakage current is below the 0.8mA
△: leakage current is 0.8～1mA
*: leakage current is above (6) thermotolerance of 1mA
Sample is exposed in 180 ℃ the baking oven, took out sample, measure stretch percentage elongation, represent with the 1/2 o'clock required time that reaches initial value every 240 hours.The mensuration of stretch percentage elongation is undertaken by ASTM-D882-61T.(7) modulus of elasticity in direct stress
Press the method for JIS-Z 1702 regulation,, under 25 ℃, the condition of 65%RH, measure with " moste is bright " type strength tester.
Embodiment and comparative example
Below enumerate embodiment and comparative example, further describe.Embodiment 1～8, comparative example 2～4
Lime acetate with 0.09 weight part is made catalyst, with the dimethyl terephthalate (DMT) of 85 weight parts and the ethylene glycol of 60 weight parts, carry out transesterification reaction according to a conventional method, add the ethylene glycol solution that contains 0.20 weight % trimethyl phosphite 99 then, add again and contain the ethylene glycol slurry that median size is the lime carbonate of 1.1 μ m, relative polyethylene terephthalate, the content of lime carbonate is as shown in table 1, then, ANTIMONY TRIOXIDE SB 203 99.8 PCT with 0.03 weight part is carried out polycondensation as catalyst, makes the polyethylene terephthalate that limiting viscosity is 0.68dl/g.
This polyethylene terephthalate after carrying out vacuum-drying under 170 ℃, is supplied with the forcing machine that is heated to 280 ℃, extrude through T pattern head, with 30 ℃ drum cooler cooling curing, the film that is not extended.Again this film is heated to 85～95 ℃, extends 3.3～4.1 times in the vertical, continue to extend 3.2～4.2 times in the horizontal, under 220 ℃, heat-treat, reel behind the cool to room temperature equably, make the thick film of 250 μ m with the tenter machine that is heated to 110 ℃.Comparative example 1
Except not using lime carbonate and phosphonic acids trimethyl, equally with embodiment 1 carry out polymerization, make the polyethylene terephthalate that limiting viscosity is 0.68dl/g.
Film forming condition and embodiment 1 are identical.
Embodiment 9
With method similarly to Example 1, just make the polyethylene terephthalate that limiting viscosity is 0.51dl/g, make sample with addition, the film forming condition of same lime carbonate.In addition, too high when service performance viscosity is the polyethylene terephthalate of 1.6dl/g because of extending stress, so can not extend fully.
Embodiment 10,11
In limiting viscosity is to add the polymethylpentene of 5 weight % and 10 weight % in 0.68 the polyethylene terephthalate, adds the phase solvation polyoxyethylene glycol of 0.5 weight % again, uses the film forming condition system film identical with embodiment 1 then.Embodiment 12
With the polymethylpentene system film among the homopolymer polypropylene replacement embodiment 10 of 5 weight %.
Embodiment 13
The material of 10 weight % lime carbonate has been added in use in limiting viscosity is 0.75 Polyethylene Naphthalate, except the longitudinal extension temperature is 100 ℃, make sample with similarly to Example 1 method.
Embodiment 14
The base resin material identical with embodiment 1, the top layer resin is used different forcing machines respectively with the material that does not add lime carbonate, through T pattern head, extrudes 3 layers of composite sheet, then, uses the film forming condition system film identical with embodiment 1.Total thickness is made 250 μ m, and the thickness on two top layers is made 25 μ m respectively.
Embodiment 15
As vibrin, be 0.75 Polyethylene Naphthalate with limiting viscosity, only in base resin, add the lime carbonate of 10 weight %, all the other and the embodiment 14 the same films of making.
Embodiment 16
Except as the top layer resin, add beyond the lime carbonate of 3 weight %, with condition system film similarly to Example 14.
Embodiment 17
As the top layer resin, with limiting viscosity is the polyethylene terephthalate of 0.85dl/g, use the material that in the polyethylene terephthalate of limiting viscosity, has added 10 weight % lime carbonate as base resin, use the condition system film identical with embodiment 14 as 0.68dl/g.
With the composition of the film of embodiment 1～17, comparative example 1～4, evaluation result induction-arrangement in table 1～table 3.Polyester film of the present invention is because the extracting amount of oligopolymer is few, and impact is a problem hardly, and thermotolerance is also excellent, so, very suitable to electrically insulating material.In addition, in them most low because of specific inductivity, leakage current is little, so, can be safely in new Flon device, use.Also have, though wherein embodiment 4 is no problem fully on performance, still, because the Y/D height usually breaks during extension, so can not stably make film.Have, in embodiment 6, tensile strength is near lower limit again, and impact also has problem slightly.In addition, embodiment 9 is 0.51 because of limiting viscosity, so oligopolymer extracting amount is many slightly, thermotolerance is also poor slightly.Comparative example 1 apparent density height, oligopolymer extracting amount is big, and comparative example 2,3 is because extension is insufficient, thus the apparent density height, because of the modulus of elasticity in direct stress is low, so on oligopolymer extracting amount, impact, thermotolerance, have problems.Comparative example 4 apparent densities are too low, simultaneously, because the modulus of elasticity in direct stress is also low, so, on impact, also have problems, so can not use at the aspects such as insulation of motor.
In following form, PET refers to polyethylene terephthalate, and PEN refers to poly-naphthalene-2,6-dioctyl phthalate second diester, and PPS refers to polyphenylene sulfide, PMP refers to polymethylpentene.
Table 1
| Film is formed | The limiting viscosity of polyester (dl/g) | |
| Embodiment 1 | PET+CaCO 3(10％) | 0.68 |
| Embodiment 2 | PET+CaCO 3(10％) | 0.68 |
| Embodiment 3 | PET+CaCO 3(10％) | 0.68 |
| Embodiment 4 | PET+CaCO 3(10％) | 0.68 |
| Embodiment 5 | PET+CaCO 3(10％) | 0.68 |
| Embodiment 6 | PET+CaCO 3(20％) | 0.68 |
| Embodiment 7 | PET+CaCO 3(5％) | 0.68 |
| Embodiment 8 | PET+CaCO 3(1％) | 0.68 |
| Embodiment 9 | PET+CaCO 3(10％) | 0.51 |
| Embodiment 10 | PET+PMP(5％) | 0.68 |
| Embodiment 11 | PET+PMP(10％) | 0.68 |
| Embodiment 12 | PET+PP(5％) | 0.68 |
| Embodiment 13 | PEN+CaCO 3(10％) | 0.75 |
| Embodiment 14 | PET/PET+CaCO 3(10％)/PET | 0.68 |
| Embodiment 15 | PEN/PEN+CaCO 3(10％)/PEN | 0.75 |
| Embodiment 16 | PET+CaCO 3(3％)/PET +CaCO 3(10％)/PET+CaCO 3(3％) | 0.68 |
| Embodiment 17 | PET1/PET2+CaCO 3(10％)/PET1 | PET1：0.68， PET2：0.85 |
| Comparative example 1 | PET | 0.68 |
| Comparative example 2 | PET+CaCO 3(10％) | 0.68 |
| Comparative example 3 | PET+CaCO 3(20％) | 0.68 |
| Comparative example 4 | PET+CaCO 3(20％) | 0.68 |
Table 2
| The longitudinal stretching temperature (℃) | Stretching ratio (vertical * horizontal stroke) | Apparent density (g/cm 3) | The modulus of elasticity in direct stress (GPa) | Y/D | Specific inductivity | |
| Embodiment 1 | 90 | 3.8×3.8 | 1.03 | 3.5 | 3.4 | 2.6 |
| Embodiment 2 | 90 | 3.3×3.2 | 1.3 | 2.7 | 2.1 | 3.1 |
| Embodiment 3 | 85 | 3.7×3.6 | 0.89 | 3.4 | 3.8 | 2.5 |
| Embodiment 4 | 85 | 4.1×4.2 | 0.88 | 3.9 | 4.4 | 2.3 |
| Embodiment 5 | 95 | 3.8×3.8 | 1.23 | 3.3 | 2.7 | 3 |
| Embodiment 6 | 90 | 3.8×3.8 | 0.86 | 2.6 | 2.9 | 2.3 |
| Embodiment 7 | 90 | 3.8×3.8 | 1.2 | 3.7 | 3.1 | 2.9 |
| Embodiment 8 | 90 | 3.8×3.8 | 1.36 | 4.4 | 3.2 | 3.2 |
| Embodiment 9 | 90 | 3.8×3.8 | 1.05 | 3.3 | 3.1 | 2.6 |
| Embodiment 10 | 90 | 3.8×3.8 | 1.15 | 3.4 | 3 | 2.8 |
| Embodiment 11 | 90 | 3.8×3.8 | 0.98 | 3.4 | 3.5 | 2.6 |
| Embodiment 12 | 90 | 3.8×3.8 | 1.1 | 3.3 | 3 | 2.7 |
| Embodiment 13 | 100 | 3.8×3.8 | 1.1 | 4.2 | 3.8 | 2.6 |
| Embodiment 14 | 90 | 3.8×3.8 | 1.18 | 3.8 | 3.2 | 2.9 |
| Embodiment 15 | 100 | 3.8×3.8 | 1.2 | 4.4 | 3.7 | 2.8 |
| Embodiment 16 | 90 | 3.8×3.8 | 1.15 | 3.7 | 3.2 | 2.8 |
| Embodiment 17 | 90 | 3.8×3.8 | 1.15 | 3.9 | 3.4 | 2.9 |
| Comparative example 1 | 90 | 3.8×3.8 | 1.39 | 4.5 | 3.2 | 3.3 |
| Comparative example 2 | 100 | 3.1×3.0 | 1.38 | 2.2 | 1.6 | 3.3 |
| Comparative example 3 | 100 | 3.1×3.1 | 1.32 | 1.8 | 1.4 | 3.1 |
| Comparative example 4 | 90 | 4.1×4.2 | 0.67 | 1.9 | 2.8 | 2.1 |
Table 3
Embodiment 18,19
| Oligopolymer | Impact | Thermotolerance | Leakage current | |
| Embodiment 1 | ○ | ○ | ○ | ○ |
| Embodiment 2 | △ | ○ | △ | × |
| Embodiment 3 | ○ | ○ | ○ | ○ |
| Embodiment 4 | ○ | ○ | ○ | ○ |
| Embodiment 5 | ○ | ○ | ○ | ○ |
| Embodiment 6 | ○ | △ | ○ | ○ |
| Embodiment 7 | ○ | ○ | ○ | ○ |
| Embodiment 8 | ○ | ○ | ○ | × |
| Embodiment 9 | △ | ○ | △ | ○ |
| Embodiment 10 | ○ | ○ | ○ | ○ |
| Embodiment 11 | ○ | ○ | ○ | ○ |
| Embodiment 12 | ○ | ○ | ○ | ○ |
| Embodiment 13 | ○ | ○ | ○ | ○ |
| Embodiment 14 | ○ | ○ | ○ | ○ |
| Embodiment 15 | ○ | ○ | ○ | ○ |
| Embodiment 16 | ○ | ○ | ○ | ○ |
| Embodiment 17 | ○ | ○ | ○ | ○ |
| Comparative example 1 | × | ○ | ○ | × |
| Comparative example 2 | × | △ | × | × |
| Comparative example 3 | × | × | × | × |
| Comparative example 4 | ○ | × | ○ | ○ |
Condition with identical with embodiment 11 makes the polyester film that thickness is 188 μ m." ア De コ one ト " 76 P1,8 parts in solidifying agent (weight) with thermotolerance polyurethane binder Japan モ one ト Application (strain) of 100 parts (weight) system, make solution with vinyl acetic monomer 32 parts (weight), use the photogravure coating process, be coated on the thick Polyethylene Naphthalate film of 25 μ m, make and solidify thick the filming of back formation 6 μ m, on the two sides of the thick polyester film of above-mentioned 188 μ m, make it bonding with the condition of 80 ℃ of roller temperature, line pressure 3kg/cm, as embodiment 18.In addition, replace sample that the Polyethylene Naphthalate film makes as embodiment 19 with polyphenylene sulfide film (eastern V (strain) makes " ト レ リ Na ").
Embodiment 20,21
Make the film that thickness is the Polyethylene Naphthalate of 188 μ m with the condition identical with embodiment 13.With bonding with the thick polyimide film (eastern V デ ュ Port Application (strain) system " カ プ ト Application ") of the thick polyphenylene sulfide film of 25 μ m and 25 μ m respectively, as embodiment 20,21 with the same method of embodiment 18,19.
The composition of film, evaluation result etc. are shown in table 4 and the table 5 among the embodiment 18～21.
Laminate film of the present invention, because of oligopolymer extracting amount, impact, good heat resistance, in addition, specific inductivity is low, leakage current is little, so, the suitable electrical isolation aspect that is used in.
Table 4
| Film is formed | The limiting viscosity of polyester (dl/g) | |
| Embodiment 18 | PEN/PET+PMP(10％)PEN | PET：0.68，PEN：0.85 |
| Embodiment 19 | PPS/PET+PMP(10％)PPS | 0.68 |
| Embodiment 20 | PPS/PEN+CaCO 3(10％)PPS | 0.75 |
| Embodiment 21 | PI/PEN+CaCO 3(10％)/PI | 0.68 |
Table 5
| Apparent density (g/cm 3) | Tensile elasticity (GPa) | Y/D | Specific inductivity | Oligopolymer | Impact | Thermotolerance | Leakage current | |
| Embodiment 18 | 1.08 | 3.7 | 3.4 | 2.8 | ○ | ○ | ○ | ○ |
| Embodiment 19 | 1.06 | 3.6 | 3.4 | 2.7 | ○ | ○ | ○ | ○ |
| Embodiment 20 | 1.15 | 4.3 | 3.7 | 2.8 | ○ | ○ | ○ | ○ |
| Embodiment 21 | 1.17 | 3.8 | 3.2 | 2.9 | ○ | ○ | ○ | ○ |
The possibility of utilizing on the industry
Close the material that the laminate film that forms is used as electric insulation with the rete with heat resistance by apparent density and stretching modulus of elasticity again at the polyester film of specific scope or its, can make low oligomerization physical property and cost is low, heat resistance, shock-resistant property, shaping processability is excellent and also good film of assembling good stability, identification property.
In addition, apparent dielectric constant can be done little, and when being used in the high refrigerant system of dielectric constant, the leakage current value of worrying can be done little.
Claims (26)
1. polyester film that electrical isolation is used, the apparent density that it is characterized in that this film is 1.37～0.85g/cm
3, the modulus of elasticity in direct stress is 2.0～4.5GPa.
2. the polyester film used of the electrical isolation of claim 1, the limiting viscosity that it is characterized in that forming the polyester resin of polyester film is 0.6～1.5dl/g.
3. the polyester film used of the electrical isolation of claim 1 is characterized in that the apparent density D (g/cm of film
3) and the pass of modulus of elasticity in direct stress Y (GPa) be 2.5＜Y/D＜4.
4. the polyester film in the electrical isolation week of claim 1 is characterized in that this polyester film is to comprise basic unit and be provided with the film top layer, that have multilayered structure at least one face of this basic unit.
5. the polyester film used of the electrical isolation of claim 4, the limiting viscosity that it is characterized in that forming the polyester resin of polyester film is 0.6～1.5dl/g.
6. the polyester film used of the electrical isolation of claim 4 is characterized in that the apparent density D (g/cm of film
3) and the pass of modulus of elasticity in direct stress Y (GPa) be 2.5＜Y/D＜4.
7. the polyester film used of the electrical isolation of claim 4 is characterized in that the apparent density on top layer is bigger than the apparent density of basic unit.
8. the polyester film used of the electrical isolation of claim 4, the thickness that it is characterized in that the top layer is 5～50% of film total thickness.
9. the polyester film used of the electrical isolation of claim 4 is characterized in that it is to form the vibrin fusion on basic unit and top layer, before extruding, it is converged and extrudes by mould, cooling after two-way stretch make.
10. the polyester film used of the electrical isolation of claim 4 is characterized in that the vibrin that forms basic unit and top layer is made up of the polymethylpentene or the polyacrylic mixture of polyethylene terephthalate or polyethylene terephthalate and no more than 10% weight.
11. the polyester film that the electrical isolation of claim 4 is used, the vibrin that it is characterized in that forming basic unit and top layer are by poly-naphthalene-2,6-dioctyl phthalate second diester is formed.
12. the polyester film that the electrical isolation of claim 4 is used, the vibrin that it is characterized in that forming basic unit is to contain non-polymkeric substance that mixes or atomic vibrin in this vibrin, described incompatible polymers is the polyolefine that is selected from polypropylene and polymethylpentene, and the described non-micropartical that mixes is a lime carbonate.
13. the polyester film that any one electrical isolation in the claim 1～12 is used is characterized in that specific inductivity is 2.2～3.0.
14. the laminate film that electrical isolation is used is characterized in that, this electrical isolation laminate film is the laminated thermotolerance film better than this polyester film at least one face of any one polyester film in claim 1～12.
15. the laminate film that the electrical isolation of claim 14 is used is characterized in that, this electrical isolation laminate film is the laminated thermotolerance film better than this polyester film on the two sides of polyester film.
16. the laminate film that the electrical isolation of claim 14 is used, it is characterized in that, polyester film is made up of the polymethylpentene or the polyacrylic mixture of polyethylene terephthalate and no more than 10%, and the film of good heat resistance is made up of polyphenylene sulfide or Polyethylene Naphthalate.
17. the laminate film that the electrical isolation of claim 15 is used is characterized in that polyester film is by poly-naphthalene-2,6-dioctyl phthalate second diester is formed, and the film of good heat resistance is made up of polyphenylene sulfide or aromatic polyimide.
18. the laminate film that the electrical isolation of claim 14 is used is characterized in that, the apparent density of laminate film is 1.37～0.85g/cm
3, the modulus of elasticity in direct stress is 2.5～5.0GPa.
19. the laminate film that the electrical isolation of claim 15 is used is characterized in that, the apparent density of laminate film is 1.37～0.85g/cm
3, the modulus of elasticity in direct stress is 2.5～5.0GPa.
20. the laminate film that the electrical isolation of claim 14 is used, the limiting viscosity that it is characterized in that forming the polyester resin of polyester film is 0.6～1.5dl/g.
21. the laminate film that the electrical isolation of claim 14 is used is characterized in that the film apparent density D (g/cm of laminate film
3) and the pass of modulus of elasticity in direct stress Y (GPa) be 3.0＜Y/D＜4.5.
22. the laminate film that the electrical isolation of claim 14 is used is characterized in that specific inductivity is 2.4～3.0.
23. a seal is characterized in that, is the cooling agent of principal constituent and has in the atmosphere of polar oil product that at the halocarbon of partial hydrogenation the polyester film that any one electrical isolation in the claim 1～12 is used is used in the electrical isolation purposes.
24. a seal is characterized in that, is the cooling agent of principal constituent and has in the atmosphere of polar oil product that at the halocarbon of partial hydrogenation the polyester film that the electrical isolation of claim 13 is used is used in the electrical isolation purposes.
25. a seal is characterized in that, is the cooling agent of principal constituent and has in the atmosphere of polar oil product that at the halocarbon of partial hydrogenation the polyester film that the electrical isolation of claim 14 is used is used in the electrical isolation purposes.
26. a seal is characterized in that, is the cooling agent of principal constituent and has in the atmosphere of polar oil product that at the halocarbon of partial hydrogenation the polyester film that any one electrical isolation in the claim 15～22 is used is used in the electrical isolation purposes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97180964A CN1089777C (en) | 1997-08-25 | 1997-08-25 | Polyester film for electrical insulation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97180964A CN1089777C (en) | 1997-08-25 | 1997-08-25 | Polyester film for electrical insulation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1242026A CN1242026A (en) | 2000-01-19 |
| CN1089777C true CN1089777C (en) | 2002-08-28 |
Family
ID=5177993
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97180964A Expired - Fee Related CN1089777C (en) | 1997-08-25 | 1997-08-25 | Polyester film for electrical insulation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1089777C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100451046C (en) * | 2006-05-11 | 2009-01-14 | 上海交通大学 | Process for preparing dedicated polyester for ultrathin film of capacitor |
| KR102334251B1 (en) * | 2019-10-02 | 2021-12-03 | 에스케이씨 주식회사 | Film and laminate for electronic board, and electronic board comprising same |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01272713A (en) * | 1988-04-21 | 1989-10-31 | Daihou Giken Kk | Production of high purity alloy steel ingot |
| JPH02272713A (en) * | 1989-04-14 | 1990-11-07 | Diafoil Co Ltd | Laminated polyester film for capacitor |
| JPH09194603A (en) * | 1996-01-22 | 1997-07-29 | Diafoil Co Ltd | Polyester film for condenser |
-
1997
- 1997-08-25 CN CN97180964A patent/CN1089777C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01272713A (en) * | 1988-04-21 | 1989-10-31 | Daihou Giken Kk | Production of high purity alloy steel ingot |
| JPH02272713A (en) * | 1989-04-14 | 1990-11-07 | Diafoil Co Ltd | Laminated polyester film for capacitor |
| JPH09194603A (en) * | 1996-01-22 | 1997-07-29 | Diafoil Co Ltd | Polyester film for condenser |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1242026A (en) | 2000-01-19 |
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