CN101863120A - Manufacturing method of super thin bidirectional stretched polypropylene coarse thin film for capacitor - Google Patents
Manufacturing method of super thin bidirectional stretched polypropylene coarse thin film for capacitor Download PDFInfo
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- CN101863120A CN101863120A CN201010195526A CN201010195526A CN101863120A CN 101863120 A CN101863120 A CN 101863120A CN 201010195526 A CN201010195526 A CN 201010195526A CN 201010195526 A CN201010195526 A CN 201010195526A CN 101863120 A CN101863120 A CN 101863120A
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- stretched polypropylene
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/911—Cooling
- B29C48/9135—Cooling of flat articles, e.g. using specially adapted supporting means
- B29C48/914—Cooling of flat articles, e.g. using specially adapted supporting means cooling drums
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
- B29C48/08—Flat, e.g. panels flexible, e.g. films
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/911—Cooling
- B29C48/9135—Cooling of flat articles, e.g. using specially adapted supporting means
- B29C48/915—Cooling of flat articles, e.g. using specially adapted supporting means with means for improving the adhesion to the supporting means
- B29C48/917—Cooling of flat articles, e.g. using specially adapted supporting means with means for improving the adhesion to the supporting means by applying pressurised gas to the surface of the flat article
Abstract
The invention discloses a manufacturing method of a super thin bidirectional stretched polypropylene coarse thin film for a capacitor. The manufacturing method is characterized by comprising the following steps of: adopting two polypropylene resin materials with degree of isotacticity of 95-98%, ash content being smaller than 30ppm and different melt indexes, melting by a primary extruder and an auxiliary extruder, extruding by a three-layered compound die head, cooling and forming at 95-105 DEG C via a cooling roller and a casting piece air knife; then stretching longitudinally with 4.5-5.0 fold of draw ratio, and forming the coarse thin film product with three-dimensional netty groove structures which are communicated with each other after stretching horizontally with 8-9 fold of draw ratio. The polypropylene coarse thin film prepared by using the invention can not only ensure good oil immersion property of the capacitor, but also satisfy the voltage resisting requirements of the capacitor under high field intensity, and is particularly suitable for being used as an electrical medium in power capacitors with large capacity, small volume and high power and the like.
Description
Technical field
The invention belongs to the preparation method who only reacts the macromolecular compound that obtains, relate to a kind of manufacture method of super thin bidirectional stretched polypropylene coarse thin film for capacitor with carbon-to-carbon unsaturated bond; Being specially adapted to thickness is the manufacturing of the super thin bidirectional stretched polypropylene coarse thin film for capacitor of 6 μ m-8 μ m; The polypropylene coarse thin film product that makes is applicable to the manufacturing of big capacity, small size, powerful power capacitor product.
Background technology
Bidirectional stretching polypropylene film is owing to be the apolar medium material, have light weight, loss is little, characteristics such as good stability, electrical insulating property and mechanical performance are good are the perfect medium materials of high-voltage power capacitor and Low-voltage Electronic capacitor, are widely used in the capacitor every profession and trade.Along with the development of society, the progress of science and technology, the capacitor industry requires more and more littler to the size of capacitor, to capacity require increasing.Formula from capacity plate antenna
Can draw, under identical coiling length condition, the spacing d of capacitor volume and two electrode is inversely proportional to, and promptly polar plate spacing is more little, and capacitance is big more.Therefore, under the satisfiable situation of dielectric material performance, the film that used thickness is thin between two pole plates of capacitor is as dielectric material, and the capacitor plate pitch smaller can realize that the power capacitor capacitance increases, and size reduces.Can draw according to capacitor industry electric capacity computing formula C=thin film capacitor film consumption * ε/d * d * ρ simultaneously, capacitor with capacity, 10 μ m thin-film material use amounts are 1.79 times of 8 μ m, and 8 μ m product existing market unit prices are 1.25 times of 10 μ m approximately, by this calculating, use 8 μ m cost decreases more than 30%; Therefore, under the prerequisite that the every performance of product guarantees, the capacitor that the manufacturing capacity is identical uses the capacitor thin film that relatively approaches specification, and not only its volume can reduce, and cost advantage is more obvious.
The high and low pressure power capacitor is because its technology and handling characteristics, require the polypropylene film medium not only higher breakdown voltage value will be arranged, also require the surface to have certain roughness simultaneously, to adapt to power capacitor immersion oil performance demands, be beneficial to capacitor oil and can be immersed in capacitor element fuse inside fully, get rid of residual gas in the fuse, guarantee good thermal diffusivity and the electrical insulating property of capacitor.Surface roughness is little, and when voidage hour, breakdown voltage improves, but the needs of immersion oil can not satisfy capacitor and make the time; Surface roughness is big, when voidage is big, the needs of immersion oil in the time of satisfying the capacitor manufacturing, but the breakdown voltage of capacitor can descend, the electricity weakness increases, and therefore making these two performance indications of polypropylene coarse film need reach a balance (being the performance indications that breakdown voltage and surface roughness satisfy the capacitor requirement simultaneously).
In the prior art, the production of bidirectional stretched polypropylene coarse thin film generally is to use commaterial and adopts an extruder, under 230 ℃～250 ℃ by heating, shear, melt extruding, (not heating of casting sheet air knife gas at 90 ℃～100 ℃ chill rolls and casting sheet air knife, be the natural environment temperature) cool off down, form the β crystal sheet that has instability, density little (with respect to alpha-crystal); Sheet carries out longitudinal stretching under 125～150 ℃ temperature conditions, when under the effect of heat and power, stretching, unstable β crystal transforms to alpha-crystal stable, density big (with respect to the β crystal), again through forming the film with solid netted alligatoring structure that is interconnected behind the cross directional stretch.
Adopt prior art to produce the coarse thin film product of conventional thickness 10 μ m～18 μ m, by above-mentioned manufacture method production, (average roughness Ra refers in measured length the film mean roughness, on the measured wheel profile each point to the profile center line distance from and mean value) be generally 0.3 μ m～0.55 μ m, maximal roughness (maximal roughness Rmax refers in measured length, on the outline line between top and the minimum peak valley difference) will reach 3.0 μ m～5.0 μ m; Because thickness is thicker, maximal roughness ratio for integral thickness less relatively (20%～40%), film breakdown voltage can satisfy the performance requirement of capacitor.
Adopt prior art to produce thickness 6 μ m-8 μ m super thin two-way oriented polypropylene alligatoring film products, thin film void rate [voidage=(lay-up method test thickness-densimetry test thickness)/densimetry test thickness * 100%, this index characterizes the porosity between the double-layer films, main needs because of immersion oil in the power capacitor manufacture process, national standard and international standard generally require about 8%] reach 7～8%, but electrical performance indexes such as breakdown voltage and electric weakness all are difficult to meet the requirements.Because film two sides cooling condition is inconsistent, causes the alligatoring structure of film inhomogeneous, form main matsurface and time matsurface.Find by film performance test and analysis, the undesirable main cause of electrical performance indexes is that film master matsurface (attaches chill roll, back abbreviation CR face) mean roughness is 0.25～0.40 μ m, and inferior matsurface (the AK face is called for short in the back) has only 0.10～0.15 μ m, the roughness difference on film two sides is bigger, and CR face alligatoring structure is inhomogeneous, and maximal roughness is bigger, surpasses 3.0 μ m.Maximal roughness and integral thickness ratio have reached more than 50%, the effective thickness of carrying proof voltage is obviously less than normal, though the breakdown voltage intermediate value index of film is up to state standards, exceed very little, but these two indexs of inferior low value breakdown voltage and electric weakness do not reach the national standard requirement, bigger to these two performance demands gaps under high field intensity with high-voltage power capacitor, the films test data see the following form:
Therefore, the thickness 6 μ m～8 μ m super thin two-way oriented polypropylene alligatoring film products that adopt prior art to produce, product quality and poor-performing are difficult to satisfy the requirement of power capacitor indexs such as breakdown voltage, electric weakness under high field intensity.
Summary of the invention
Purpose of the present invention is intended to overcome above-mentioned deficiency of the prior art, and a kind of manufacture method of super thin bidirectional stretched polypropylene coarse thin film is provided; The super thin bidirectional stretched polypropylene coarse thin film two sides alligatoring that makes is even, and this film is used for power capacitor, can satisfies the immersion oil requirement, can satisfies electrical performance indexes requirements such as breakdown voltage and electric weakness again.
Content of the present invention is: a kind of manufacture method of super thin bidirectional stretched polypropylene coarse thin film for capacitor is characterized in that comprising the following steps:
A, batching: press core material 65%～75%, the weight percent batching of surface material 25%～35%, it is 95%～98% that core material adopts isotacticity, content of ashes is less than 30ppm, melt index is that (there is the HC312BF of Borealis in manufacturing enterprise for the polyacrylic resin material of 2.5g/10min～3.2g/10min, Mitsui chemistry F104A-1 etc.), it is 95%～98% that surface material adopts isotacticity, content of ashes is less than 30ppm, melt index is that (there is the HC314BF of Borealis in manufacturing enterprise for the polyacrylic resin material of 3.5g/10min～4.2g/10min, Mitsui chemistry F104A etc.); Described core material and surface material are the polypropylene dedicated resin material of electrician's level;
B, melt extrude: (auxilliary-main-auxilliary three layers is surface layer-sandwich layer-surface layer) melt is extruded and formed to core material and surface material by auxilliary-main-auxilliary three layers of compound die head simultaneously after main and auxiliary pair of extruder fusion, wherein: the extrusion temperature of core material is that 230 ℃～250 ℃, extrusion capacity account for 65%～75% of total extrusion capacity weight percent, and the extrusion temperature of surface material is that 210 ℃～230 ℃, extrusion capacity account for 25%～35% of total extrusion capacity weight percent;
The moulding of c, melt cooling casting sheet: it is cooling casting sheet moulding under 95 ℃～105 ℃ chill roll, the condition that casting sheet air knife gas temperature is 95 ℃～105 ℃ that melt is placed temperature, makes instability, β crystal sheet that density is little;
D, biaxial tension: with sheet at 125 ℃～145 ℃, carry out longitudinal stretching under the condition of longitudinal stretching than (film is the draw roll quick roll and the ratio of the speed between the roller at a slow speed in a longitudinal direction) 4.5～5.0 times, when stretching, realize density is little, it is big that unsettled β crystal changes into density, stable alpha-crystal, then at 157 ℃～162 ℃, cross directional stretch than cross directional stretch under the condition of (ratio of the width before the Breadth Maximum that the width upper film stretches does not stretch with film) 8～9 times after, promptly make (having the solid netted alligatoring structure that is interconnected) super thin bidirectional stretched polypropylene coarse thin film for capacitor product.
In the content of the present invention: being cooled in the moulding of the cooling of melt described in step c casting sheet: the one side of melt is cooled off by attaching chill roll, the another side of melt adopt the air knife of a heating the gas blow pressure, cool off (the gas blow pressure that the another side that promptly is attached to the melt on chill roll surface adopts the air knife of a heating) by air knife gas, the air knife gas temperature is consistent with the chill roll chilling temperature, be 95 ℃～105 ℃; Melt is consistent by chill roll and air knife gas temperature, during cooling, consistent, the cooling of two sides cooling evenly, can after stretching, form alligatoring evenly, the two sides mean roughness is 0.15 μ m～0.30 μ m, voidage is 7%～8%, maximal roughness is less than the coarse thin film of 2.5 μ m.
In the content of the present invention: the pressure of the gas of air knife described in the step c is 90～110mba preferably.
Compared with prior art, the present invention has following characteristics and beneficial effect:
(1) the present invention adopts two kinds of polyacrylic resin materials of melt index difference and part by weight, through three layers of compound die head extrude (auxilliary-main-auxilliary) simultaneously, the system temperature process conditions are inconsistent; Top layer (be surface layer, thickness is about 1.0～1.5 μ m) polyacrylic resin material melt index is relatively large, and under the process conditions relatively low at extrusion temperature, that chilling temperature is identical, the β crystal amount of generation is many, the function of bearing film surface coarsening; And the molten finger of core material is little, and under the process conditions higher relatively at extrusion temperature, that chilling temperature is identical, the β crystal amount of generation is few, the function of bearing film proof voltage;
(2) the present invention adopts air knife gas to cool off, casting sheet two sides chilling temperature unanimity during the melt cooling, the sheet two sides crystalline rate of formation and crystal habit and spherulitic growth size differences are reduced, reach film two sides alligatoring unanimity, alligatoring effect of uniform after transforming by crystal; In the longitudinal stretching zone, under the effect of heat and power, make the little β crystal of a large amount of instabilities, density that forms behind the cooling forming change into big, the stable α crystalline substance of density, have the uniform ultrathin coarse thin film of the solid netted alligatoring that is interconnected through forming behind 8～9 times of cross directional stretch;
(3) the 6 μ m～8 9 mu m ultra thin type bidirectional stretched polypropylene coarse thin film products that adopt the present invention to produce, the average roughness Ra on film two sides is 0.15 μ m～0.30 μ m, voidage 7%～8%, and maximal roughness Rmax is 250～280V/ μ m less than 2.5 μ m, element method breakdown voltage intermediate value;
(4) by control to ultrathin polypropylene film average roughness Ra and maximal roughness Rmax size, realize the evenly alligatoring of film two sides, solved capacitor to ultra-thin film balanced contradiction between breakdown voltage, electric weakness and film immersion oil three, make 6 μ m～8 9 mu m ultra thin type thin-film component method breakdown voltage intermediate values of making bring up to 250V/ μ m～310V/ μ m, the immersion oil that capacitor is good can be guaranteed, the requirement of capacitor proof voltage under high field intensity can be satisfied again;
(5) technology of the present invention is simple, the super thin bidirectional stretched polypropylene coarse thin film of preparation is specially adapted to use as dielectric in big capacity, small size, power capacitor such as high-power, the good immersion oil of capacitor can be guaranteed, the requirement of capacitor proof voltage under high field intensity can be satisfied again, practical.
The specific embodiment
Embodiment given below intends so that the invention will be further described; but can not be interpreted as it is limiting the scope of the invention; the person skilled in art to some nonessential improvement and adjustment that the present invention makes, still belongs to protection scope of the present invention according to the content of the invention described above.
Embodiment 1:
A kind of manufacture method of super thin bidirectional stretched polypropylene coarse thin film for capacitor comprises the following steps:
(1) use three layers of compound die head, main and auxiliary two extruders to mix the mode of co-extrusion; Use that isotacticity is 95%～98%, content of ashes is less than 30ppm, special-purpose alligatoring polyacrylic resin materials of two kinds of electrician's levels that melt index is different; The core material melt index is 2.5g/10min～3.2g/10min, and the ratio of extruding is 65%～75%, is extruded by main extruder, and extrusion temperature is 230 ℃～250 ℃; The surface material melt index is 3.5g/10min～4.2g/10min, and the ratio of extruding is 25%～35%, is extruded by auxilliary extruder, and extrusion temperature is 210 ℃～230 ℃;
(2) in melt when cooling,, chill-roll temperature is controlled to be 95 ℃～105 ℃, is melting when showing consideration for attached chill roll cooling simultaneously, and 95 ℃～105 ℃ of air knife gas temperatures, air knife gas pressure 110mbar are cooled off by the heating air knife in its back side;
(3) in the longitudinal stretching zone, the longitudinal stretching temperature is reduced to 125 ℃～145 ℃ to stretch 4.7 times down, in the cross directional stretch zone, 8～9 times of 157 ℃～162 ℃ following cross directional stretch, making thickness after the thermal finalization is the power capacitor super thin bidirectional stretched polypropylene coarse thin film of 6 μ m or 8 μ m.
Embodiment 2:
A kind of manufacture method of super thin bidirectional stretched polypropylene coarse thin film for capacitor comprises the following steps:
A, batching: press core material 65%, the weight percent batching of surface material 35%, it is 95%～98% that core material adopts isotacticity, content of ashes is less than 30ppm, melt index is that (there is the HC312BF of Borealis in manufacturing enterprise for the polyacrylic resin material of 2.5g/10min～3.2g/10min, Mitsui chemistry F104A-1 etc., other embodiment can be identical), it is 95%～98% that surface material adopts isotacticity, content of ashes is less than 30ppm, melt index is that (there is the HC314BF of Borealis in manufacturing enterprise for the polyacrylic resin material of 3.5g/10min～4.2g/10min, Mitsui chemistry F104A etc., other embodiment can be identical);
B, melt extrude: (auxilliary-main-auxilliary three layers is surface layer-sandwich layer-surface layer) melt is extruded and formed to core material and surface material by auxilliary-main-auxilliary three layers of compound die head simultaneously after main and auxiliary pair of extruder fusion, wherein: the extrusion temperature of core material is that 230 ℃～250 ℃, extrusion capacity account for 65% of total extrusion capacity weight percent, and the extrusion temperature of surface material is that 210 ℃～230 ℃, extrusion capacity account for 35% of total extrusion capacity weight percent;
The moulding of c, melt cooling casting sheet: it is that 95 ℃～105 ℃ chill roll, casting sheet air knife gas temperature is that 95 ℃～105 ℃, the pressure of air knife gas are cooling casting sheet moulding under the condition of 110mba that melt is placed temperature, makes instability, β crystal sheet that density is little;
D, biaxial tension: sheet is carried out longitudinal stretching under 125 ℃～145 ℃, the condition of longitudinal stretching than 4.5 times, when stretching, realize little, the unsettled β crystal of density is changed into big, the stable alpha-crystal of density, under 157 ℃～162 ℃, the condition of cross directional stretch, behind the cross directional stretch, promptly make (having the solid netted alligatoring structure that is interconnected) super thin bidirectional stretched polypropylene coarse thin film for capacitor product then than 8 times;
Being cooled in the moulding of the cooling of melt described in step c casting sheet: the one side of melt is cooled off by attaching chill roll, the another side of melt adopt the air knife of a heating the gas blow pressure, cool off (the gas blow pressure that the another side that promptly is attached to the melt on chill roll surface adopts the air knife of a heating) by air knife gas, the air knife gas temperature is consistent with the chill roll chilling temperature, be 95 ℃～105 ℃; Melt is consistent by chill roll and air knife gas temperature, during cooling, consistent, the cooling of two sides cooling evenly, can after stretching, form alligatoring evenly, the two sides mean roughness is 0.15 μ m～0.30 μ m, voidage is 7%～8%, maximal roughness is less than the coarse thin film of 2.5 μ m.
Embodiment 3:
A kind of manufacture method of super thin bidirectional stretched polypropylene coarse thin film for capacitor comprises the following steps:
A, batching: the weight percent batching of pressing core material 75%, surface material 25%, core material adopts that isotacticity is 95%～98%, content of ashes is the polyacrylic resin material of 2.5g/10min～3.2g/10min less than 30ppm, melt index, and surface material adopts that isotacticity is 95%～98%, content of ashes is the polyacrylic resin material of 3.5g/10min～4.2g/10min less than 30ppm, melt index; Described core material and surface material are the polypropylene dedicated resin material of electrician's level;
B, melt extrude: (auxilliary-main-auxilliary three layers is surface layer-sandwich layer-surface layer) melt is extruded and formed to core material and surface material by auxilliary-main-auxilliary three layers of compound die head simultaneously after main and auxiliary pair of extruder fusion, wherein: the extrusion temperature of core material is that 230 ℃～250 ℃, extrusion capacity account for 75% of total extrusion capacity weight percent, and the extrusion temperature of surface material is that 210 ℃～230 ℃, extrusion capacity account for 25% of total extrusion capacity weight percent;
The moulding of c, melt cooling casting sheet: it is that 95 ℃～105 ℃ chill roll, casting sheet air knife gas temperature is that 95 ℃～105 ℃, the pressure of air knife gas are cooling casting sheet moulding under the condition of 110mba that melt is placed temperature, makes instability, β crystal sheet that density is little;
D, biaxial tension: sheet is carried out longitudinal stretching under 125 ℃～145 ℃, the condition of longitudinal stretching than 5.0 times, when stretching, realize little, the unsettled β crystal of density is changed into big, the stable alpha-crystal of density, under 157 ℃～162 ℃, the condition of cross directional stretch, behind the cross directional stretch, promptly make the super thin bidirectional stretched polypropylene coarse thin film for capacitor product then than 9 times;
Being cooled in the moulding of the cooling of melt described in step c casting sheet: the one side of melt is cooled off by attaching chill roll, the another side of melt adopt the air knife of a heating the gas blow pressure, cool off by air knife gas, the air knife gas temperature is consistent with the chill roll chilling temperature, be 95 ℃～105 ℃.
Embodiment 4:
A kind of manufacture method of super thin bidirectional stretched polypropylene coarse thin film for capacitor comprises the following steps:
A, batching: the weight percent batching of pressing core material 70%, surface material 30%, core material adopts that isotacticity is 95%～98%, content of ashes is the polyacrylic resin material of 2.5g/10min～3.2g/10min less than 30ppm, melt index, and surface material adopts that isotacticity is 95%～98%, content of ashes is the polyacrylic resin material of 3.5g/10min～4.2g/10min less than 30ppm, melt index;
B, melt extrude: (auxilliary-main-auxilliary three layers is surface layer-sandwich layer-surface layer) melt is extruded and formed to core material and surface material by auxilliary-main-auxilliary three layers of compound die head simultaneously after main and auxiliary pair of extruder fusion, wherein: the extrusion temperature of core material is that 230 ℃～250 ℃, extrusion capacity account for 70% of total extrusion capacity weight percent, and the extrusion temperature of surface material is that 210 ℃～230 ℃, extrusion capacity account for 30% of total extrusion capacity weight percent;
The moulding of c, melt cooling casting sheet: it is that 95 ℃～105 ℃ chill roll, casting sheet air knife gas temperature is that 95 ℃～105 ℃, the pressure of air knife gas are cooling casting sheet moulding under the condition of 100mba that melt is placed temperature, makes instability, β crystal sheet that density is little;
D, biaxial tension: sheet is carried out longitudinal stretching under 125 ℃～145 ℃, the condition of longitudinal stretching than 4.8 times, when stretching, realize little, the unsettled β crystal of density is changed into big, the stable alpha-crystal of density, under 157 ℃～162 ℃, the condition of cross directional stretch, behind the cross directional stretch, promptly make the super thin bidirectional stretched polypropylene coarse thin film for capacitor product then than 8.5 times;
Being cooled in the moulding of the cooling of melt described in step c casting sheet: the one side of melt is cooled off by attaching chill roll, the another side of melt adopt the air knife of a heating the gas blow pressure, cool off by air knife gas, the air knife gas temperature is consistent with the chill roll chilling temperature, be 95 ℃～105C.
Embodiment 5～11:
A kind of manufacture method of super thin bidirectional stretched polypropylene coarse thin film for capacitor, the core material in the step a batching and the weight percent consumption of surface material see the following form respectively:
Other is with arbitrary among the embodiment 1～4, slightly.
The performance indications that satisfy the ultrathin polypropylene coarse thin film product of capacitor requirement are: average roughness Ra is 0.15-0.30 μ m, maximal roughness Rmax＜2.5 μ m, voidage 5.0-10%, and electric weakness number is (individual/m
2): 6 μ m :≤1.8/m
2, 8 μ m :≤1/m
2, element method voltage is 6 μ m: intermediate value 〉=190 (v/ μ m), inferior low value 〉=80 (v/ μ m), 8 μ m: intermediate value 〉=250 (v/ μ m), inferior low value 〉=120 (v/ μ m).
The index test result of the super thin bidirectional stretched polypropylene coarse thin film for capacitor product that employing foregoing invention content and embodiment preparation method make is as follows:
1, roughness
2, electrical property and other indexs
From test result, the surface average roughness Ra and the maximal roughness Rmax of the film that employing the present invention makes reach target call, and voidage reaches the capacitor manufacturing process requirement, and every electrical performance indexes meets and exceeds national standard and high-end product requirement.
The invention is not restricted to the foregoing description, content of the present invention is described all can implement and have described good result.
Claims (3)
1. the manufacture method of a super thin bidirectional stretched polypropylene coarse thin film for capacitor is characterized in that comprising the following steps:
A, batching: the weight percent batching of pressing core material 65%～75%, surface material 25%～35%, core material adopts that isotacticity is 95%～98%, content of ashes is the polyacrylic resin material of 2.g/10min～3.2g/10min less than 30ppm, melt index, and surface material adopts that isotacticity is 95%～98%, content of ashes is the polyacrylic resin material of 3.5g/10min～4.2g/10min less than 30ppm, melt index;
B, melt extrude: melt is extruded and formed to core material and surface material by auxilliary-main-auxilliary three layers of compound die head simultaneously after main and auxiliary pair of extruder fusion, wherein: the extrusion temperature of core material is that 230 ℃～250 ℃, extrusion capacity account for 65%～75% of total extrusion capacity weight percent, and the extrusion temperature of surface material is that 210 ℃～230 ℃, extrusion capacity account for 25%～35% of total extrusion capacity weight percent;
The moulding of c, melt cooling casting sheet: it is cooling casting sheet moulding under 95 ℃～105 ℃ chill roll, the condition that casting sheet air knife gas temperature is 95 ℃～105 ℃ that melt is placed temperature, makes sheet;
D, biaxial tension: sheet is carried out longitudinal stretching under 125 ℃～145 ℃, the condition of longitudinal stretching than 4.5～5.0 times, under 157 ℃～162 ℃, the condition of cross directional stretch, behind the cross directional stretch, promptly make the super thin bidirectional stretched polypropylene coarse thin film for capacitor product then than 8～9 times.
2. press the manufacture method of the described super thin bidirectional stretched polypropylene coarse thin film for capacitor of claim 1, it is characterized in that: being cooled in the moulding of the cooling of melt described in step c casting sheet: the one side of melt is cooled off by attaching chill roll, the another side of melt adopt the air knife of a heating the gas blow pressure, cool off by air knife gas, the air knife gas temperature is consistent with the chill roll chilling temperature, be 95 ℃～105 ℃.
3. by the manufacture method of claim 1 or 2 described super thin bidirectional stretched polypropylene coarse thin film for capacitor, it is characterized in that: the pressure of the gas of air knife described in the step c is 90～110mba.
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102049859A (en) * | 2010-11-04 | 2011-05-11 | 龙辰(黄冈)电子科技有限公司 | BOPP thin-film production technology for capacitor with multi-layered compound structure |
| CN102509610A (en) * | 2011-12-28 | 2012-06-20 | 宁波绿海电子材料有限公司 | Preparation method for 2.5 mu m polypropylene capacitor thin film |
| CN102751091A (en) * | 2012-07-06 | 2012-10-24 | 江苏中立方实业有限公司 | High-temperature resistant ultrathin polypropylene metalized capacitor film for capacitor |
| CN103434110A (en) * | 2013-08-30 | 2013-12-11 | 华威聚酰亚胺有限责任公司 | High-performance polypropylene film for heavy-current capacitors and manufacturing method thereof |
| CN108859464A (en) * | 2018-07-27 | 2018-11-23 | 福融辉实业（福建）有限公司 | A kind of efficient transfer membrane and preparation method thereof |
| WO2019071396A1 (en) * | 2017-10-09 | 2019-04-18 | Abb Schweiz Ag | Dielectric film and power capacitor comprising dielectric film |
| CN114015151A (en) * | 2021-10-28 | 2022-02-08 | 安徽飞达电气科技有限公司 | Polypropylene capacitor film with high breakdown voltage |
| CN114179341A (en) * | 2021-10-28 | 2022-03-15 | 安徽飞达电气科技有限公司 | Biaxially oriented polypropylene film for capacitor |
| CN115071238A (en) * | 2022-07-29 | 2022-09-20 | 浙江南洋华诚科技有限公司 | High-performance polypropylene film for high-voltage power capacitor and preparation method thereof |
| CN115232394A (en) * | 2021-04-23 | 2022-10-25 | 全球能源互联网研究院有限公司 | Polypropylene film for capacitor and preparation method and application thereof |
| CN116176018A (en) * | 2023-02-23 | 2023-05-30 | 河北海伟电子新材料科技股份有限公司 | Polypropylene capacitor film applied to electronic anti-monitoring tag and preparation method thereof |
| CN116252502A (en) * | 2023-03-13 | 2023-06-13 | 天津大学 | Method for improving dielectric property of polypropylene film based on interface deposition modification |
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| CN102049859B (en) * | 2010-11-04 | 2013-05-15 | 湖北龙辰科技股份有限公司 | BOPP thin-film production technology for capacitor with multi-layered compound structure |
| CN102049859A (en) * | 2010-11-04 | 2011-05-11 | 龙辰(黄冈)电子科技有限公司 | BOPP thin-film production technology for capacitor with multi-layered compound structure |
| CN102509610A (en) * | 2011-12-28 | 2012-06-20 | 宁波绿海电子材料有限公司 | Preparation method for 2.5 mu m polypropylene capacitor thin film |
| CN102509610B (en) * | 2011-12-28 | 2013-06-19 | 宁波大东南万象科技有限公司 | Preparation method for 2.5 mu m polypropylene capacitor thin film |
| CN102751091A (en) * | 2012-07-06 | 2012-10-24 | 江苏中立方实业有限公司 | High-temperature resistant ultrathin polypropylene metalized capacitor film for capacitor |
| CN102751091B (en) * | 2012-07-06 | 2014-12-03 | 江苏中立方实业有限公司 | High-temperature resistant ultrathin polypropylene metalized capacitor film for capacitor |
| CN103434110A (en) * | 2013-08-30 | 2013-12-11 | 华威聚酰亚胺有限责任公司 | High-performance polypropylene film for heavy-current capacitors and manufacturing method thereof |
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| US11569036B2 (en) | 2017-10-09 | 2023-01-31 | Hitachi Energy Switzerland Ag | Dielectric film and power capacitor comprising dielectric film |
| WO2019071396A1 (en) * | 2017-10-09 | 2019-04-18 | Abb Schweiz Ag | Dielectric film and power capacitor comprising dielectric film |
| CN108859464A (en) * | 2018-07-27 | 2018-11-23 | 福融辉实业（福建）有限公司 | A kind of efficient transfer membrane and preparation method thereof |
| CN115232394A (en) * | 2021-04-23 | 2022-10-25 | 全球能源互联网研究院有限公司 | Polypropylene film for capacitor and preparation method and application thereof |
| CN114179341A (en) * | 2021-10-28 | 2022-03-15 | 安徽飞达电气科技有限公司 | Biaxially oriented polypropylene film for capacitor |
| CN114015151A (en) * | 2021-10-28 | 2022-02-08 | 安徽飞达电气科技有限公司 | Polypropylene capacitor film with high breakdown voltage |
| CN115071238A (en) * | 2022-07-29 | 2022-09-20 | 浙江南洋华诚科技有限公司 | High-performance polypropylene film for high-voltage power capacitor and preparation method thereof |
| CN116176018A (en) * | 2023-02-23 | 2023-05-30 | 河北海伟电子新材料科技股份有限公司 | Polypropylene capacitor film applied to electronic anti-monitoring tag and preparation method thereof |
| CN116176018B (en) * | 2023-02-23 | 2023-11-14 | 河北海伟电子新材料科技股份有限公司 | Polypropylene capacitor film applied to electronic anti-monitoring tag and preparation method thereof |
| CN116252502A (en) * | 2023-03-13 | 2023-06-13 | 天津大学 | Method for improving dielectric property of polypropylene film based on interface deposition modification |
| CN116252502B (en) * | 2023-03-13 | 2023-10-27 | 天津大学 | Method for improving dielectric property of polypropylene film based on interface deposition modification |
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