CN101623947A - Ultra-thin BOPET film and manufacturing method thereof - Google Patents
Ultra-thin BOPET film and manufacturing method thereof Download PDFInfo
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- CN101623947A CN101623947A CN200910101587A CN200910101587A CN101623947A CN 101623947 A CN101623947 A CN 101623947A CN 200910101587 A CN200910101587 A CN 200910101587A CN 200910101587 A CN200910101587 A CN 200910101587A CN 101623947 A CN101623947 A CN 101623947A
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Abstract
The invention relates to an ultra-thin BOPET film which comprises an upper layer, a middle layer and a lower layer, wherein the upper layer is an upper antisticking agent layer, the middle layer is a PET layer, the lower layer is a lower antisticking agent layer, the middle layer is covered on the lower layer, the upper layer is covered on the middle layer, the upper antisticking agent layer and the lower antisticking agent layer both comprise PET and antisticking agent, and the antisticking agent is nano silicon dioxide with the grain size being less than 1.5 micrometers, wherein the mass percent of the PET is 98.5-99.5 percent, and the mass percent of the antisticking agent is 0.5-1.5 percent. The invention relates to a manufacture method of the ultra-thin BOPET film. The invention can effectively reduce the thickness of the BOPET film and meet the development requirement of a lithium battery and a photovoltaic power supply.
Description
Technical field
The present invention relates to a kind of BOPET (biaxial stretching polyester) film and manufacture method thereof.
Background technology
Along with development of science and technology, the exploitation of new forms of energy has become international important topic.The extensive application of lithium battery and photovoltaic cell more promotes with the power supply to be that sending out of the vehicles of power and solar electrical energy generation industry opened.At present, lithium battery and photo-voltaic power supply trend miniaturization, gathering and high power capacity; So domestic power supply manufacturing enterprise requires the BOPET film of the supporting supply of material to be reduced to 4～6 μ m from thickness 10 μ m, the production technology of existing BOPET film only can be produced the above BOPET film of thickness 10 μ m, can not satisfy the growth requirement of lithium battery and photo-voltaic power supply; Adopt existing processes to process the following BOPET film of 10 μ m, occur became uneven, wrinkling transverse fissure easily, tension failure, volume film operation situation such as have some setbacks.
Summary of the invention
Limited for the thickness of the BOPET film that overcomes existing BOPET film and manufacturing process thereof, as can not to satisfy the growth requirement of lithium battery and photo-voltaic power supply deficiency the invention provides a kind of thickness that can effectively reduce the BOPET film, satisfies the ultra-thin BOPET film and the manufacture method thereof of the growth requirement of lithium battery and photo-voltaic power supply.
The technical solution used in the present invention is:
A kind of ultra-thin BOPET film, comprise upper strata, intermediate layer and lower floor, described upper strata is last antiplastering aid layer, described middle level is a pet layer, described lower floor is following antiplastering aid layer, described intermediate layer covers in the described lower floor, described upper strata covers on the described intermediate layer, it is characterized in that: the described antiplastering aid layer of going up includes PET and antiplastering aid with following antiplastering aid layer, described antiplastering aid is a nano silicon, the particle size of described silica is less than 1.5 μ m, and wherein the mass percent of PET is 98.5～99.5%, and the mass percent of antiplastering aid is 0.5～1.5%.
Further, in the described ultra-thin BOPET film, the mass percent of last antiplastering aid layer is 5～10%, and the mass percent in intermediate layer is 75～90%, and the mass percent of following antiplastering aid layer is 5～15%.
A kind of manufacture method of ultra-thin BOPET film comprises that metering mixes, and carries out pre-crystallizing and drying, is extruded into melt, carries out melt-stoichiometry again, cast sheet again, and carry out longitudinal stretching, cross directional stretch, and the traction of side cut sided corona treatment, and carry out rolling and cut moulding; It is characterized in that: when metering mixed, the particle size of silica was less than 1.5 μ m, and in last antiplastering aid layer and following antiplastering aid layer, the mass percent of PET is 98.5～99.5%, and the mass percent of antiplastering aid is 0.5～1.5%; In the whole ultra-thin BOPET film, the mass percent of last antiplastering aid layer is 5～10%, and the mass percent in intermediate layer is 75～90%, and the mass percent of following antiplastering aid layer is 5～15%; Carry out double-filtration in described extrusion system exit, adopt disc type video disc filter, the aperture of coarse filtration is 20 μ m, and smart aperture of filtering is 10 μ m; Adopt high strength cooling mode in longitudinal stretching, cross directional stretch operation, the cooling water water temperature adopts 15～22 ℃.
Further, in the described cross directional stretch operation, the openings get smaller of anchor clamps, film to be processed is caught at the edge of opening.
Further again, in the described cross directional stretch operation, even, the uniform wind field of temperature of blast is adopted in the thermal finalization air channel.
Beneficial effect of the present invention is mainly reflected in: can effectively reduce the BOPET film thickness, satisfy the growth requirement of lithium battery and photo-voltaic power supply; Solved the BOPET film effectively at thickness only under the limiting case of 4～6 μ m, product quality reaches requirement, and the film thickness is even, and is wrinkle resistant, not transverse fissure, do not rupture, the film volume is neat, it is smooth to cut edge, the transparency height.
Figure of description
Fig. 1 is the ultra-thin BOPET film structural representation.
Fig. 2 is a ultra-thin BOPET membrane preparation method process chart.
The specific embodiment
The present invention is described further below in conjunction with specific embodiment, but protection scope of the present invention is not limited in this:
Embodiment 1
With reference to Fig. 1, a kind of ultra-thin BOPET film, comprise upper strata 1, intermediate layer 2 and lower floor 3, described upper strata 1 is last antiplastering aid layer, described middle level 2 is a pet layer, described lower floor 3 is following antiplastering aid layer, described intermediate layer 2 covers in the described lower floor 3, described upper strata 1 covers on the described intermediate layer 2, the described antiplastering aid layer of going up includes PET and antiplastering aid with following antiplastering aid layer, and described antiplastering aid is a nano silicon, and the particle size of described silica is smaller or equal to 1.5 μ m, wherein the mass percent of PET is 98.5～99.5%, and the mass percent of antiplastering aid is 0.5～1.5%.
In the described ultra-thin BOPET film, the mass percent of last antiplastering aid layer is 5～10%, and the mass percent in intermediate layer is 75～90%, and the mass percent of following antiplastering aid layer is 5～15%.
In the present embodiment, described going up in antiplastering aid layer and the following antiplastering aid layer, the mass percent of PET is 98.5%, the mass percent of antiplastering aid is 1.5%.
In the ultra-thin BOPET film, the mass percent of last antiplastering aid layer is 5%, and the mass percent in intermediate layer is 90%, and the mass percent of following antiplastering aid layer is 5%.
Embodiment 2
In the present embodiment, described going up in antiplastering aid layer and the following antiplastering aid layer, the mass percent of PET is 99%, the mass percent of antiplastering aid is 1%.
In the ultra-thin BOPET film, the mass percent of last antiplastering aid layer is 7%, and the mass percent in intermediate layer is 85%, and the mass percent of following antiplastering aid layer is 8%.
All the other structures are identical with embodiment.
Embodiment 3
In the present embodiment, described going up in antiplastering aid layer and the following antiplastering aid layer, the mass percent of PET is 99.1%, the mass percent of antiplastering aid is 0.9%.
In the ultra-thin BOPET film, the mass percent of last antiplastering aid layer is 9%, and the mass percent in intermediate layer is 81%, and the mass percent of following antiplastering aid layer is 10%.
All the other structures are identical with embodiment.
Embodiment 4
In the present embodiment, described going up in antiplastering aid layer and the following antiplastering aid layer, the mass percent of PET is 99.3%, the mass percent of antiplastering aid is 0.7%.
In the ultra-thin BOPET film, the mass percent of last antiplastering aid layer is 10%, and the mass percent in intermediate layer is 78%, and the mass percent of following antiplastering aid layer is 12%.
All the other structures are identical with embodiment.
Embodiment 5
In the present embodiment, described going up in antiplastering aid layer and the following antiplastering aid layer, the mass percent of PET is 99.5%, the mass percent of antiplastering aid is 0.5%.
In the ultra-thin BOPET film, the mass percent of last antiplastering aid layer is 9%, and the mass percent in intermediate layer is 76%, and the mass percent of following antiplastering aid layer is 15%.
All the other structures are identical with embodiment.
Embodiment 6
In the present embodiment, described going up in antiplastering aid layer and the following antiplastering aid layer, the mass percent of PET is 99.4%, the mass percent of antiplastering aid is 0.6%.
In the ultra-thin BOPET film, the mass percent of last antiplastering aid layer is 10%, and the mass percent in intermediate layer is 75%, and the mass percent of following antiplastering aid layer is 15%.
All the other structures are identical with embodiment.
Embodiment 7
A kind of manufacture method of ultra-thin BOPET film comprises that metering mixes, and carries out pre-crystallizing and drying, is extruded into melt, carries out melt-stoichiometry again, cast sheet again, and carry out longitudinal stretching, cross directional stretch, and the traction of side cut sided corona treatment, and carry out rolling and cut moulding; When metering mixed, the particle size of silica was less than 1.5 μ m, and in last antiplastering aid layer and following antiplastering aid layer, the mass percent of PET is 98.5～99.5%, and the mass percent of antiplastering aid is 0.5～1.5%; In the whole ultra-thin BOPET film, the mass percent of last antiplastering aid layer is 5～10%, and the mass percent in intermediate layer is 75～90%, and the mass percent of following antiplastering aid layer is 5～15%; Carry out double-filtration in described extrusion system exit, adopt disc type video disc filter, the aperture of coarse filtration is 20 μ m, and smart aperture of filtering is 10 μ m; Adopt high strength cooling mode in longitudinal stretching, cross directional stretch operation, the cooling water water temperature adopts 15～22 ℃.
In the described cross directional stretch operation, the openings get smaller of anchor clamps, film to be processed is caught at the edge of opening.Even, the uniform wind field of temperature of blast is adopted in the thermal finalization air channel.
In the technology of present embodiment, raw material is crucial, owing to need the preparation ultrathin film, unholiness and entering of undesirable raw material will cause producing failure; Should select the optimal balance point of polyester and inherent viscosity (IV), if inherent viscosity is big, then tensile force needs to cause film stretching inhomogeneous greatly, and thickness deviation control is bad; If inherent viscosity is little, then molecular weight is little, causes crystallization rate fast, and the rupture of membranes rate rises.So select PET polyester IV size very important for the production of ultra-thin BOPET.Inherent viscosity is optimum between should being chosen in 0.58～0.65.PET polyester IV fluctuation range size (width of molecular weight) must could be used between ± 0.01.
Subordinate list is the PET polyester property list that ultra-thin BOPET film uses:
| Project | Data target | Testing standard |
| Inherent viscosity IV (dI/g) | ??0.58～0.65 | ??ASTMD2857 |
| Section size (mm) | ??3×3×2.5 | ??- |
| Density (g/cm 2) | ??0.33 | ??ASTMD792 |
| Fusing point (℃) | ??＞250 | ??ASTMD2117 |
| DEG content (%) | ??1±0.2 | ??- |
| Moisture | ??＜0.4 | ??ASTMD4019 |
| Content of ashes | ??＜0.05 | ??ASTMD229 |
| COOH content | ??＜35 | ??- |
| Yellow colour index | ??-3～+2 | ??ASTMD1925 |
| 〉=10 μ m gel examples (individual/mg) | ??＜2 | ??- |
In the described BOPET film, the antiplastering aid of employing must adopt nano silicon, sticks together in the process that runs up to prevent the ultra-thin BOPET film.The dimensional requirement of nano-silicon dioxide particle must be smaller or equal to 1.5 μ m, and require the microscopically in the compressing tablet test, and the unanimity that is evenly distributed can not have the size of conglomerate to exist more than or equal to 3～3.5 μ m.
Described ultra-thin BOPET film, in order to guarantee the high clarity of melt in process of production, the melt compactness that promotes casting machine to come out is good, promote the secondary stretching to be unlikely to rupture of membranes, so fondant filter to extrusion system die head exit place, encrypt significantly, 20 μ m are adjusted to by 30 original μ m～40 μ m in the coarse filtration aperture; Smart pore size filter is adjusted into 10 μ m by 20 original μ m; Filter is revised as the high-quality disc filter by plain filter.Can guarantee not have big impurity and gel to enter the sheet formation system of casting machine, ultra-thin stretching is rupture of membranes not.
In longitudinal stretching (MDO) process, since lepthymenia, very easily break, and tracing it to its cause is that vertically the unit cooling is not enough continuously, the Quench ability.Will improve the unit chill roll, make major diameter into, be revised as 200mm by original diameter 150mm, the cooling water water temperature is reduced to 15～22 ℃ by original 22～30 ℃.
Owing to strengthened cooling tube, prolonged the cool time of film, reduce coolant water temperature, the degree of crystallinity of control drawing process has been guaranteed not breaking of longitudinal stretching film.
In order to adapt to the production needs of thickness 4～6 μ m, must be customized again to German Bruckner company (BRUECRNER) to the special fixture of cross directional stretch (TDO), openings get smaller makes the edge can catch ultrathin membrane, operation is normal, stretching is orderly, unlikely rupture of membranes.
Thermal finalization air channel to the cross directional stretch system undergoes technological transformation, and circular air channel is revised as in original square air channel, and at the valve place of each preheating zone test blast, guarantees that each blast is equal substantially; And control the heater of each preheating zone, control the temperature of each preheating zone; Accurately regulate the balance of wind field and the constant character of temperature, wind field, blast uniformity and the temperature constant character of whole cross directional stretch system, extremely important to producing ultra-thin BOPET film, be the thickness evenness and the key technology control point of production normality continuously.
Good rolling also is a technology point, and rolling must be adopted the accurate screw mandrel and the linear synchronous motor of the up-to-date production of BRUECKNER company, adopts the Microcomputer Data input, makes film degree of tightness unanimity, and smooth surface does not have vestige.
Described ultra-thin BOPET processing parameter is as follows:
Speed of production is: 250 meters/minute～270 meters/minute of the speeds of production of main line;
PET chip drying: the baking temperature of pre-crystallization: 130～135 ℃; Baking temperature is: 165～170 ℃, be 2.5 hours drying time.
Extruder and melt die melt temperature:
| One district | Two districts | Three districts | Four districts | Five districts | Six districts | Seven districts |
| ??210～220℃ | ??255～265℃ | ??275～285℃ | ??275～285℃ | ??265～275℃ | ??265～275℃ | ??265～275℃ |
Wherein, the temperature of melt pipe is: 265～275 ℃; The temperature of filter is: 275～285 ℃; The temperature of die head is: 265～275 ℃.
Cold drum: linear velocity is 70～75 meters/minute;
The temperature in each district of longitudinal stretching (MOD):
| Preheating one district | Preheating two districts | Preheating three districts | A district stretches | Two districts stretch |
| ??56～60℃ | ??60～65℃ | ??70～75℃ | ??75～80℃ | ??22～28℃ |
The temperature of cooling and shaping: 42～46 ℃; The ratio of infrared auxiliary heating is: 70%; MOD draw ratio: 3.4～3.5.
It is as follows that cross directional stretch (TDO) is respectively distinguished temperature,
(1) preheating zone
| Preheating one district | Preheating two districts | Preheating three districts | Preheating four districts | Preheating five districts |
| ??88～93℃ | ??90～95℃ | ??90～95℃ | ?95～100℃ | ?95～100℃ |
(2) drawing zone
(3) heat set zone
| One district | Two districts | Three districts | Four districts | Five districts |
| ??175～185℃ | ??180～190℃ | ??215～225℃ | ??225～235℃ | ??230～240℃ |
| Six districts | Seven districts | Eight districts | Nine districts | Ten districts | The Shi Yi district |
| ??235～245℃ | ??238～248℃ | ??240～250℃ | ??240～250℃ | ??220～230℃ | ??215～225℃ |
(4) cooling and shaping district
| One district | Two districts | Three districts | Four districts | Five districts | Six districts |
| ??145～155℃ | ??140～150℃ | ??125～135℃ | ??115～125℃ | ??45～55℃ | ??45～55℃ |
Cut edge and rolling equipment:
Speed is 260 meters/minute, rolling tension force: 60～68N/M; Rolling pressure: 50～60N/M.
Claims (5)
1, a kind of ultra-thin BOPET film, comprise upper strata, intermediate layer and lower floor, described upper strata is last antiplastering aid layer, described middle level is a pet layer, described lower floor is following antiplastering aid layer, described intermediate layer covers in the described lower floor, described upper strata covers on the described intermediate layer, it is characterized in that: the described antiplastering aid layer of going up includes PET and antiplastering aid with following antiplastering aid layer, described antiplastering aid is a nano silicon, the particle size of described silica is less than 1.5 μ m, and wherein the mass percent of PET is 98.5～99.5%, and the mass percent of antiplastering aid is 0.5～1.5%.
2, ultra-thin BOPET film as claimed in claim 1, it is characterized in that: in the described ultra-thin BOPET film, the mass percent of last antiplastering aid layer is 5～10%, and the mass percent in intermediate layer is 75～90%, and the mass percent of following antiplastering aid layer is 5～15%.
3, a kind of manufacture method of ultra-thin BOPET film as claimed in claim 1 comprises that metering mixes, and carries out pre-crystallizing and drying, be extruded into melt, carry out melt-stoichiometry again, cast sheet again, and carry out longitudinal stretching, cross directional stretch, the traction of side cut sided corona treatment, and carry out rolling and cut moulding; It is characterized in that: when metering mixed, the particle size of silica was less than 1.5 μ m, and in last antiplastering aid layer and following antiplastering aid layer, the mass percent of PET is 98.5～99.5%, and the mass percent of antiplastering aid is 0.5～1.5%; In the whole ultra-thin BOPET film, the mass percent of last antiplastering aid layer is 5～10%, and the mass percent in intermediate layer is 75～90%, and the mass percent of following antiplastering aid layer is 5～15%; Carry out double-filtration in described extrusion system exit, adopt disc type video disc filter, the aperture of coarse filtration is 20 μ m, and smart aperture of filtering is 10 μ m; Adopt high strength cooling mode in longitudinal stretching, cross directional stretch operation, the cooling water water temperature adopts 15～22 ℃.
4, the manufacture method of ultra-thin BOPET film as claimed in claim 1 is characterized in that: in the described cross directional stretch operation, and the openings get smaller of anchor clamps, film to be processed is caught at the edge of opening.
5, as the manufacture method of claim 3 or 4 described ultra-thin BOPET films, it is characterized in that: in the described cross directional stretch operation, even, the uniform wind field of temperature of blast is adopted in the thermal finalization air channel.
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| CN2009101015874A CN101623947B (en) | 2009-08-06 | 2009-08-06 | Ultra-thin BOPET film and manufacturing method thereof |
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| CN104559090A (en) * | 2015-01-31 | 2015-04-29 | 云梦县德邦实业有限责任公司 | Anti-aging bopet film |
| CN105479880A (en) * | 2015-12-06 | 2016-04-13 | 安徽国风塑业股份有限公司 | High breakdown-resistant, flame retardant and biaxially oriented polyester film and preparation method thereof |
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| CN106142785A (en) * | 2016-06-29 | 2016-11-23 | 安徽国风塑业股份有限公司 | A kind of dry plate composite bidirectional stretching mylar 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 |
| CN107116874A (en) * | 2017-04-24 | 2017-09-01 | 浙江永盛薄膜科技有限公司 | A kind of temperature control semiconductor BOPET polyester base films and its production technology |
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Free format text: CORRECT: INVENTOR; FROM: HUANG SHUISHOU TO: HUANG SHUISHOU HUANG FEIGANG |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: HANGZHOU DA DONG NAN GAOKE PACKAGING CO., LTD. Assignor: Zhejiang Great Southeast Packaging Co., Ltd. Contract record no.: 2012330000220 Denomination of invention: Ultra-thin BOPET film and manufacturing method thereof Granted publication date: 20120404 License type: Exclusive License Open date: 20100113 Record date: 20120427 |