CN102558775B - Ultra-thin type polyester film for capacitor and production method thereof - Google Patents
Ultra-thin type polyester film for capacitor and production method thereof Download PDFInfo
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- CN102558775B CN102558775B CN2010106019770A CN201010601977A CN102558775B CN 102558775 B CN102558775 B CN 102558775B CN 2010106019770 A CN2010106019770 A CN 2010106019770A CN 201010601977 A CN201010601977 A CN 201010601977A CN 102558775 B CN102558775 B CN 102558775B
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Abstract
The invention discloses an ultra-thin type biaxially-oriented polyester film for a capacitor. The polyester film slice contains nano-level spherical SiO2 with the added amount being 4000-4500PPM and a metal acetate with the added amount being 250-280PPM, wherein the average particle size of the nano-level spherical SiO2 is 1mum, and the metal acetate is magnesium acetate. The invention also provides a production method of the ultra-thin type biaxially-oriented polyester film for the capacitor, which comprises a step for preparing polyester slices and a step for preparing the biaxially-oriented polyester film. The polyester film has the performances such as uniform thickness, excellent dielectric performance and excellent heat stability, and can be used as a base material of the capacitor.
Description
Technical field
The present invention relates to a kind of biaxially oriented polyester film and production method thereof, belong to technical field of composite materials.Specifically, relate to a kind of extra-thin polyester film and production method thereof of using base material as miniature capacitor.
Background technology
Biaxially oriented polyester film, due to its good physical and mechanical properties, electrical apparatus insulation performance, barrier property, resistance toheat, optical property and dimensional stability etc., polyester film has become second main application approach of polyester, is widely used in tape, packing, sensitization, electrical apparatus insulation, printing, drawing, label etc. field.Expanding day along with the Application Areas of polyester film, some performance of conventional polyester film is introduced and can not be met the application at some special dimension, market in urgent need has the functional polyalkylene ester film of some specific function, as sub-smooth type polyester film, anti-static polyester film, heat shrinkable polyester film, ultrathin capacitor membrane, ultrathin heat, shift (Thermal Transfer Ribbon is called for short TTR) film etc.
Along with the high speed development of the industries such as electronics, electrical equipment, for requisite electrical element---electrical condenser wherein, require gas constantly to microminiaturization, high capacitance, high stability development.So also certainly will require as the miniature capacitor insulating substrate polyester film, have the performance requriements special with respect to general polyester film: thickness ultrathin and even, good dielectric properties, excellent thermostability.
At present in the world, conventional ultrathin capactive film working method, generally all adopt special-purpose separately raw material, adopts special production line and special stretching mode to make.Wherein special raw material, generally adopt silicon-dioxide (SiO
2) and calcium carbonate (CaCO
3) as inorganic additives, to improve electrostatic adhesion performance and the film surface frictional coefficient of film in the course of processing.Due to CaCO
3Be weakly alkaline, thereby easy and glycol reaction is reunited, therefore can only adopt dimethyl terephthalate (DMT) (Dimethyl terephthalate method) transesterify-condensation methods (being called for short the DMT method) method preparation, Production Flow Chart is long, equipment is many, investment is large but because the DMT method exists, and there is in process of production toxic substance methyl alcohol to participate in polluting the shortcomings such as more, progressively eliminate at present.In addition, SiO
2And CaCO
3Dispersed be also a large difficult point.
In the preparation of common polyester film, the method that mostly adopts single-point to stretch at present.Wherein vertical top temperature of drawing generally is no more than 100 ℃, and stretching ratio, between 3.5-4.0, and is most frequently used in below 3.8; The horizontal stretching ratio drawn, between 3.8-4.3, be most frequently used between 4.0-4.2, and the relaxation rate of cross directional stretch is in 7% left and right.Comparatively speaking, film forming stability is good for these techniques, and due to slab speed fast (more than general 80m/min), line speed is fast, production capacity is large simultaneously.And the preparation of ultrathin electric capacity polyester film, difficulty is that one is to cause that because slab speed does not increase line speed is on the low side, the 2nd, and thickness deviation is difficult to reach in 4%, and the thermal characteristics of film is not good, and the control of thin-film electro weakness etc.
Summary of the invention
The present invention of institute of the present invention is intended to by dispersing method adjustment, composition of raw materials and the preparation technology's of the selection preparing polyester raw material process additive types, additive adjustment, overcome above-mentioned ultrathin capactive film production shortcoming, so that a kind of ultrathin electric capacity polyester film with characteristics such as even thickness, dielectric properties are good, excellent heat stability to be provided, and corresponding preparation method.
The present invention realizes by two steps, the preparation of the female section of the first step dedicated polyester, the preparation of ester film of second ultrathin electrical condenser.
The present invention has selected nano-level sphere SiO
2As first-selected additive.In general polyethylene terephthalate (polyethylene terephthalate is called for short PET) film, add SiO
2Additive is as opening agent, SiO
2The particle diameter of powder is controlled at 2-4 μ m, and at present general be 4.2um.And the film thickness of ultrathin membrane own is just in about 4.0um, the SiO of 4um
2Easily in grain edges, form small hole, thereby affect the film-forming properties of film and the electrical property of final film.Specific surface area is large, the top layer atomicity is many, the surfactivity high because having for the nanometer materials that the present invention adopts, and is filled into after polymkeric substance interface binding intensity with polymkeric substance with regard to height, has reduced the possibility that additive peels off from film surface.And spherical additive can improve the processing characteristics of film, make film have good rolling performance and cut performance, also avoided the excessive film forming stability caused of particle diameter, electrical property variation influence.In addition, than resistance, the present invention has also added a kind of acetic acid metallic compound---magnesium acetate on a small quantity in the slice processing process for the melting that reduces polyester slice, and to improve the electrostatic adhesion ability in the film preparation process, addition is controlled at 250-280PPM.It is neutral that magnesium acetate is, and avoided CaCO
3Weakly alkaline shortcoming, can directly adopt pure terephthalic acid (Purified terephthalic acid) direct esterification-condensation methods (being called for short the PTA method) preparation.The standby polyester slice of PTA legal system, because its by product is water, environmental pollution is little, and the polyester production facility of most domestic can meet the preparation of demand raw material of the present invention.
Due to SiO
2In ethylene glycol (ethylene glycol is called for short EG), be very easy to cohesion, therefore need to carry out surface treatment, also will consider simultaneously how evenly additive to be distributed in polyester.Working method commonly used has two rollers to open refining, Screw Extrusion, melting mixing, solution mixing etc.But inorganic nanoparticles is owing to having high surface polarity, very strong reunion trend is arranged, the effect such as heat, power in polymer processing, its original dispersion equilibrium state of destructible, often obtain the additive of the reunion of big scale, thereby lose the peculiar effect of nano particle.The present invention, for additive can be evenly spread in polymkeric substance, adopts pre-configured SiO
2The EG slurry, slurry is directly added to the situ aggregation method preparation section of reactor after esterification, wherein SiO
2EG slurry process adopt high-speed stirring and be aided with the ultrasonic wave dispersion method, thereby obtained finally SiO in polyester slice
2Median size is 1um, and content is in the promising result of 4000-4500PPM.
Ultrathin electric capacity polyester film of the present invention, in preparation, has adopted special-purpose ultra thin type polyester film production line, has adopted special preparation technology, thereby has obtained the product of excellent property.As everyone knows, the preparation method that biaxially oriented polyester film is general comprises following operation: raw material drying, melt extrude, aftertreatment, the rolling etc. such as slab moulding, longitudinal stretching, cross directional stretch, trimming.For the present invention, preparation section is identical, but in several important steps, has adopted special film-forming process therein.
At first be in the slab operation, because film thickness is very thin, and, in order to guarantee insulating property, cause product of the present invention poor at the electrostatic adhesion Performance Ratio of slab process.In the present invention, take on the one hand to add the acetic acid metal oxide and compare resistance with the melting that reduces polyester in the raw material preparation process, on the other hand on conventional electrostatic adsorption device basis, increase by one group of edge valve the slab edge is blown to processing, the adsorption of strengthening to diaphragm edge, to improve the attached effect of the note of diaphragm on slab roller.Final like this, control slab speed upper and lower at 50m/min.
Secondly on longitudinal stretching, the present invention adopts 3 stretching modes, in the situation that improve the tensile strength that production rate guarantees film.For the PET film, stretching ratio is larger, and film strength is higher but thermal contraction is also large; Draft temperature is higher, and the intensity of film is low, thermal contraction is also low.The present invention has determined that longitudinal stretching technique is: stretching ratio is at 4.4-4.7, and the stretch zones temperature is at 100-115 ℃, auxiliary with the instantaneous heating of infrared lamp simultaneously, to improve the temperature of diaphragm.Simultaneously for fear of diaphragm when the high temperature and the roll surface adhesion, improve the homogeneity of film thickness and the stability of production, the present invention transforms vertical (MDO) stretcher specially, at preheating section, adopt teflon material roller, stretch section to adopt silicon rubber roller and ceramic roller, cooling section to adopt chrome-plated roller, simultaneously the ceramic roller surface is also improved the processing of roughness, meet the processing requirement of producing to guarantee equipment.Above-mentioned transformation can guarantee that diaphragm has higher temperature, can prevent the diaphragm roll banding again vertical drawing on equipment (MDO).
On horizontal operation, controlling emphasis has two.The one, rational technique to be to guarantee film forming stability, and another is that good heat setting process is to guarantee the good thermal stability of film.As everyone knows, the PET biaxially oriented film, the less film forming stability of thickness is poorer; The cross directional stretch multiplying power is excessive, and film forming is unstable, and stretching ratio is too small, easily causes film insufficiently to cause that thickness deviation is bad because stretching.In addition, if film larger shake occurs horizontal draw in casing, also easy rupture of membranes.In the present invention, in order well to be controlled to membrane stability and film thickness tolerance, technology controlling and process is: progressively rise progressively in draft temperature minute 7 zones between 110-120 ℃, stretching ratio 3.5-3.7, reduce simultaneously the stretch section rotation speed of fan, to reduce wind speed, thereby reduce the film shake, to reduce the impact on forming thin film stability.
Horizontal to draw the effect of heat setting type be to make the molecular chain orientation of film change crystalline orientation into, thereby eliminate internal stress, makes film obtain good resistance toheat.Generally speaking, through after heat setting type, the degree of crystallinity of film can reach 45%-55%, thereby reduces the percent thermal shrinkage of film, guarantees the dimensional stability of film.But if heat setting temperature is too high, can reduce on the one hand the tensile strength of film, also easily because of thin film crystallization, spend height on the other hand film is become fragile, cause the typing rupture of membranes; The too low requirement that does not reach heat setting type of heat setting temperature, make the film heat stability energy bad.And ultrathin membrane is on the low side due to film thickness, its heat setting type speed is more a lot of soon than conventional PET film, if with conventional heat setting process production, can cause on the contrary film heat setting type lax difficulty afterwards again, and the horizontal thermal contraction of the finished product is higher.The heat setting temperature that the present invention adopts is at 225-230 ℃, and 150 ℃-180 ℃ of lax stabilitys guarantee the dimensional stability of film, and the distance of heat setting type simultaneously shortens to 12m from 15m, has finally obtained the ultrathin electric capacity polyester film with excellent heat stability.
According to the above, the present invention adopts a kind of ultra-thin type polyester film for capacitor special raw material of independent development, and this raw material is with nano-level sphere SiO
2As first-selected additive, addition is at 4000-4500PPM, and the magnesium acetate of interpolation 250-280PPM, with adopting direct dispersion method in-situ polymerization to be aided with simultaneously the ultrasonic wave dispersion method, above-mentioned additive is uniformly dispersed in polyester slice.Utilize special-purpose ultrathin membrane production line and partly transform, adopting special production technique, particularly on longitudinal stretching and cross directional stretch technique, with conventional biaxially oriented film, great difference being arranged.On vertical drawing process, adopt stretching ratio at 4.4-4.7, the stretch zones temperature is at 100-115 ℃; On horizontal drawing process, adopt lower stretching rotation speed of fan, draft temperature is between 110-120 ℃, stretching ratio 3.5-3.7,225-30 ℃ of heat setting temperatures, 150 ℃-180 ℃ of lax stabilitys, the distance of heat setting type simultaneously shortens to 12m from 15m, has following thickness ultrathin and even thereby obtained, dielectric properties are good, the ultrathin electric capacity polyester film of excellent heat stability.
The accompanying drawing explanation
Fig. 1 is process flow sheet of the present invention;
Fig. 2 is under microscope, polyester film surface situation, the SiO of protuberant particles for adding
2Particle.
The present invention is described in detail below in conjunction with the drawings and specific embodiments.
Embodiment
As shown in Figure 1, the invention will be further described below in conjunction with embodiment, but the present invention never only limits to these embodiment.
Implement one: the preparation of special-purpose section
By the 4000-4500PPM median size, be the SiO of 100nm
2After surface treatment, add the magnesium acetate of 250-280PPM, both stir by high speed centrifugation together, and auxiliary with ultrasonic wave, be dispersed in ethylene glycol and form slurry, then on polymeric kettle, carry out esterification, polycondensation, Cast Strip, pelletizing and make the modified PET section, in this section, SiO
2Median size be 1.0um.
The prewired flow process of additive:
1. premix → 2. grinding → 3. filter → 4. concentration is confirmed
Wherein step 1.: SiO
2Prewired 15% the EG slurry of making, high-speed stirring be more than 3 hours, and circulate, auxiliary with ultrasonic wave simultaneously, disperses (being the ultrasonic wave dispersion method);
Step is 2.: the glass microballon with certain particle diameter grinds;
Step is 3.: adopt 2 sections filtrations, filtering net precision 5um;
Step is 4.: guarantee ultimate density 10%.
It is as follows that section prepares the basic technology parameter:
Esterification Stage: temperature 230-260 ℃, pressure 0.3Mpa, stirring velocity 80rpm, about 2.5hr of reaction times
Polycondensation phase: 280 ℃ of temperature, vacuum tightness≤100Pa, stirring velocity 80rpm, about 2.5hr of reaction times.According to above test conditions, gained special mother microtomy index of the present invention is as shown in table 1.
When esterification completes slurry and enters polycondensation vessel, the SiO configured
2The EG slurry join polycondensation vessel.
Whole section preparation process is direct dispersion method in-situ polymerization.The chip property obtained is as follows:
Table 1 modified PET resin property index.
Under microscope, as shown in Figure 2, protuberant particles is the SiO of interpolation to the polyester film surface situation
2Particle.
Implement two: the preparation 1 of 4.0um electric capacity polyester film
Technical process
Wherein main technique is as follows:
Slab speed: 50m/min;
Longitudinal stretching:
3 stretchings;
Stretch ratio: 4.45;
Roller top temperature: 112 ℃;
Cross directional stretch:
Stretch ratio: 3.55;
Heat setting temperature: 225 ℃;
Lax temperature: 170 ℃;
Relaxation rate: 4.95%.
Table 2:
Implement three: the preparation 2 of 4.0um electric capacity polyester film
Technical process
Wherein main technique is as follows:
Slab speed: 48m/min;
Longitudinal stretching:
3 stretchings;
Stretch ratio: 4.7;
Roller top temperature: 115 ℃;
Cross directional stretch:
Stretch ratio: 3.55;
Heat setting temperature: 230 ℃;
Lax temperature: 175 ℃;
Relaxation rate: 4.95%.
Final acquisition end properties is as shown in table 3 below:
Should be understood that those skilled in the art can make various changes or modifications the present invention after having read above-mentioned teachings of the present invention, these equivalent form of values fall within the application's appended claims limited range equally.
Claims (2)
1. method for preparing ultra-thin type polyester film for capacitor, its step comprises polyester slice preparation and polyester film preparation, it is characterized in that, described ultra thin type polyester film first stirs the nano-level sphere SiO2 of 4000-4500PPM by high speed centrifugation together with acetic acid metallic compound that addition is 250-280PPM in section preparation, and auxiliary with ultrasonic wave, be dispersed in ethylene glycol and form slurry, then on polymeric kettle, carry out esterification, polycondensation, Cast Strip, pelletizing, in-situ polymerization is prepared into the PET section; Described polyester film preparation is divided into first longitudinal stretching, rear cross directional stretch, and the stretching ratio of described longitudinal stretching is 4.4-4.7, and the stretch zones temperature is 100-115 ℃, auxiliary with the instantaneous heating of infrared lamp simultaneously; The draft temperature of cross directional stretch is between 110-120 ℃, and stretching ratio is 3.5-3.7, reduces simultaneously the stretch section rotation speed of fan; Horizontal heat setting temperature 225-230 ℃, 150 ℃-180 ℃ of lax stabilitys, the heat setting type distance shortens to 12m from 15m.
2. the method for preparing ultra thin type polyester film according to claim 1, it is characterized in that, in described drawing process, the longitudinal stretching equipment of employing adopts teflon material roller at preheating section, stretch section adopts silicon rubber roller and ceramic roller, and cooling section adopts chrome-plated roller.
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| CN105315622A (en) * | 2014-06-17 | 2016-02-10 | 上海紫东薄膜材料股份有限公司 | Method of producing polyester thin film used for ultrathin-type glue tape |
| CN105269791A (en) * | 2014-06-24 | 2016-01-27 | 上海紫东薄膜材料股份有限公司 | Application of precise filter screen in production of ultra-thin capacitor polyester film |
| CN105315627A (en) * | 2014-06-30 | 2016-02-10 | 上海紫东薄膜材料股份有限公司 | Ultrathin polyester thin film used for gold and silver wires and production method thereof |
| CN106065132A (en) * | 2016-06-13 | 2016-11-02 | 吴江佳亿电子科技有限公司 | A kind of composite polystyrene capacitor material and preparation method thereof |
| CN106313577A (en) * | 2016-08-11 | 2017-01-11 | 苏州柯创电子材料有限公司 | Production technology of biaxially oriented polyester film |
| CN112646139B (en) * | 2019-10-12 | 2023-05-05 | 中国石油化工股份有限公司 | Polyester for matte film and preparation method of film of polyester |
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| CN1897178A (en) * | 2005-07-15 | 2007-01-17 | 上海紫东薄膜材料股份有限公司 | Two-way stretched polyester thin-film of capacitor and its production |
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Effective date of registration: 20170407 Address after: 201108 Minhang District, Shanghai Road, No. 1899 spring Patentee after: Shanghai Zidong Chemical Materials Co., Ltd. Address before: 201111 Shanghai city Minhang District Zijiang industrial city C block Patentee before: Zidong Film Material Co., Ltd., Shanghai |
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Address after: 201108 Minhang District, Shanghai Road, No. 1899 spring Patentee after: Shanghai Purple East nylon Mstar Technology Ltd Address before: 201108 Minhang District, Shanghai Road, No. 1899 spring Patentee before: Shanghai Zidong Chemical Materials Co., Ltd. |