CN103171223A - Bidirectional-stretching online-coating optical base film and its making method - Google Patents
Bidirectional-stretching online-coating optical base film and its making method Download PDFInfo
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- CN103171223A CN103171223A CN2013100749059A CN201310074905A CN103171223A CN 103171223 A CN103171223 A CN 103171223A CN 2013100749059 A CN2013100749059 A CN 2013100749059A CN 201310074905 A CN201310074905 A CN 201310074905A CN 103171223 A CN103171223 A CN 103171223A
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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
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- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
The invention relates to a bidirectional-stretching online-coating optical base film and its making method. The optical base film comprises a three-layer co-extruded bidirectional-stretching polyester film, and a coat having a thickness of 1-10mum and coated on at least one surface of the polyester film. The three-layer co-extruded polyester base film has an A/B/A structure and is formed by two co-extruded surface layers (the A layers) and a core layer (the B layer) positioned between the two surface layers. The coat adopts an aqueous polyurethane coating liquid, and includes a silica colloid having a particle size of 40-50mum, and micron-sized silica having a particle size of 1-6mum. The optical base film having the above structure has the characteristics of high light transmittance, low haze, good adhesion resistance and the like, and is suitable for the use in optical films comprising diffusion films, whitening films and protection films for the optical use.
Description
Technical field
The invention belongs to the blooming field, be specifically related to a kind of biaxial tension and apply online optics basement membrane and preparation method thereof.
Background technology
Biaxially oriented polyester film has the excellent optical property with excellence, good mechanical performance and heat resistance, is being used widely in recent years.The biaxial tension optical polyester film is used as the optics basement membrane and is widely used in the field of display devices such as LCD, CRT, PDP, EL owing to having good dimensional stability, chemical resistance, high transparent and good processability with respect to other plastic sheetings.
When polyester film is produced, when making film take-up, smooth surface easily is sticked together, to after cut, packing, deep processing cause difficulty, and can form at film surface the defectives such as trickle pit, longitudinal stripe, thereby affect the apparent mass of film.
In order to improve the resistance to blocking of polyester film, need to add a certain amount of antiblocking agent in film.These antiblocking agents form microballoon at film surface, and projection makes between film and film and forms air layer at film surface.The existence of air layer has reduced the coefficient of friction between film and film, makes film take-up smooth and easy.Unreel, cut and the downstream deep processing is more prone to.
The conventional polyester film adopts silica as antiblocking agent.Because inorganic particulate is easy to reunite, and there is no enough compatibilities between polyester and inorganic particulate, and can cause inorganic particulate to disperse in film inhomogeneous, easily assemble forming large-size particle, and in the film stretching process, can form the space around inorganic particulate and polyester.The space of the large-size particle of assembling and the formation that stretches can have a strong impact on the optical property of film, causes the reduction of film light transmittance, mist degree to become large.
Summary of the invention
The object of the present invention is to provide a kind of optics basement membrane that does not use antiblocking agent in film, and the online method for preparing the optics basement membrane that applies of utilizing is provided.
The present invention for the concrete technical scheme that arrives the above-mentioned purpose employing is: a kind of biaxial tension applies the optics basement membrane online, comprises three-layer co-extruded polyester base film and is coated at least one lip-deep thickness of polyester base film in the coating of 1-10 μ m.
Described three-layer co-extruded polyester film is that the A/B/A structure is by two top layers (A layer) and the sandwich layer between two top layers (B layer) formation of co-extrusion.Top layer and sandwich layer component are 100% pet resin (PET), and its intrinsic viscosity is 0.68 ± 0.02dL/g, and colourity b value is-3 ~+2, and top layer and sandwich layer all do not contain antiblocking agent.
Described three-layer co-extruded polyester film gross thickness is at 0.10-0.20mm, and skin depth is at 0.010-0.025mm, and its two skin depth equates.
Described coating adopts polyurethanes water-based coating liquid, comprises average grain diameter at the cataloid of 40 ~ 50nm, and the micron silica of particle diameter 1 ~ 6 μ m.
Described coating liquid preparation method is as follows: after the polyurethane polymer dilute with water, add wherein nanoscale cataloid and micron silica, and add ethylene glycol monobutyl ether, surfactant and curing agent, and adjust the pH value 7.2 ~ 8.0 of coating liquid with acid-base modifier.
In described coating fluid, each constituent mass percentage is as follows: polyurethane polymer 20-35%, nanoscale cataloid 0.1 ~ 1%, micron silica 0.02 ~ 0.5%, ethylene glycol monobutyl ether 0.5-3%, surfactant 0.01-0. 2%, curing agent 5-15%, a small amount of soda acid blender surplus is pure water.
A kind of biaxial tension applies optics basement membrane and preparation method thereof online, and is specific as follows:
1, sandwich layer and top layer PET raw material are carried out drying 2 ~ 4h at 120 ~ 180 ℃ of temperature, because the hydrolysis reflection at high temperature easily occurs in polyester, must drying before using, water content should≤45ppm(pressure differential method trace water measures).
2, sandwich layer PET raw material is sent into twin-screw and go out melting in machine, simultaneously, top layer PET raw material is sent into melting in another double screw extruder, sandwich layer melt and top layer melt melt extrude in two extruders, through melt pipe, measuring pump, filter to the co-extrusion module, extrude sheet from die head by 3 layers of T die heads mouth mould inner sandwich layer melt top layer melt after through three layers of distributor, die head temperature is controlled at 278-282 ℃, when sheet is extruded, linear velocity is controlled at 8-15m/min, with the slab roller and the cold wind that pass into lower than 20 ℃ of temperature water, sheet is carried out cooling slab.
3, sheet is carried out longitudinal stretching, namely in the film movement direction, first the roller by 60-80 ℃ of temperature carries out preheating, carry out the infrared heater heating of 110-150 ℃, and carrying out longitudinal stretching under the vertical stretching ratio of the linear velocity of 0.2m/s-1.1m/s, 3.0-3.4:1, stretching time is less than 0.2s.
4, the sheet after longitudinal stretching applies its at least one surface by coating machine.
5, carry out cross directional stretch, the i.e. direction vertical with film movement, send in heating cabinet to carry out preheating at the temperature of 100-120 ℃, time is controlled at 10-60s, then carries out cross directional stretch under the cross directional stretch multiplying power of the temperature 3.0-3.5:1 of 110-160 ℃, and the time is controlled at 10-60s, then carrying out thermal finalization under the condition of 190-230 ℃ processes, processing time is 10-60s, film is relaxed cooling, and temperature is at 25 ~ 160 ℃.
6, rolling makes polyester film, and overall film thickness is at 0.10-0.20mm.
Tool of the present invention has following beneficial effect after adopting and upward lifting technical scheme: 1, do not use antiblocking agent in polyester film, eliminated the film light transmittance reduction of adding antiblocking agent in using and bringing, the problem that mist degree increases.2, the present invention utilizes online painting method, forms anti-stick coat at film surface, and the film that makes has resistance to blocking, smoothness preferably, unreels, cuts and the downstream deep processing is more prone to.3, adopt the water-based coating liquid, utilize horizontal drawing process to be cured drying to online coat, reduced operation, energy-conserving and environment-protective.
The specific embodiment
Embodiment 1:
By mass percentage: polyurethane polymer 30%, nanoscale cataloid 0.8%, micron silica 0.4%, ethylene glycol monobutyl ether 1%, surfactant 0.03%, curing agent 9.4%, a small amount of soda acid blender surplus is pure water.Be mixed with coating liquid stand-by.
Film preparation:
1, (inherent viscosity is 0.68 with sandwich layer and top layer PET raw material, colourity b value is for+1) carry out dry 3.5h at 170 ℃ of temperature, because the hydrolysis reflection at high temperature easily occurs in polyester, must drying before using, water content should≤45ppm(pressure differential method trace water measures);
2, sandwich layer PET raw material is sent into twin-screw and go out melting in machine, simultaneously, top layer PET raw material is sent into melting in another double screw extruder, sandwich layer melt and top layer melt melt extrude in two extruders, through melt pipe, measuring pump, filter to the co-extrusion module, extrude sheet from die head by 3 layers of T die heads mouth mould inner sandwich layer melt top layer melt after through three layers of distributor, die head temperature is controlled at 278-282 ℃, when sheet is extruded, linear velocity is controlled at 9.3m/min, with the slab roller and the cold wind that pass into lower than 20 ℃ of temperature water, sheet is carried out cooling slab;
3, sheet is carried out longitudinal stretching, namely in the film movement direction, first the roller by 60-80 ℃ of temperature carries out preheating, carry out the infrared heater heating of 110-150 ℃, and carrying out longitudinal stretching under the vertical stretching ratio of the linear velocity of 0.2m/s-1.1m/s, 3.2:1, stretching time is less than 0.2s;
4, the sheet after longitudinal stretching applies its at least one surface by coating machine;
5, carry out cross directional stretch, the i.e. direction vertical with film movement, send in heating cabinet to carry out preheating at the temperature of 112 ℃, time is controlled at 10-60s, then carries out cross directional stretch under the cross directional stretch multiplying power of the temperature 3.5:1 of 128 ℃, and the time is controlled at 10-60s, then carrying out thermal finalization under the condition of 210-230 ℃ processes, processing time is 10-60s, film is relaxed cooling, and temperature is at 25 ~ 160 ℃;
6, rolling makes polyester film, and overall film thickness is at 0.188mm.
Embodiment 2:
By mass percentage: polyurethane polymer 30%, nanoscale cataloid 0.80%, micron silica 0.20%, ethylene glycol monobutyl ether 1%, surfactant 0.03%, curing agent 9.4%, a small amount of soda acid blender surplus is pure water.Be mixed with coating liquid stand-by.
Thin film preparation process is with embodiment 1.
Embodiment 3:
By mass percentage: polyurethane polymer 30%, nanoscale cataloid 1.00%, micron silica 0.10%, ethylene glycol monobutyl ether 1%, surfactant 0.03%, curing agent 9.4%, a small amount of soda acid blender surplus is pure water.Be mixed with coating liquid stand-by.
Thin film preparation process is with embodiment 1.
Performance comparison:
Above embodiment and general thickness are that the film of 188 μ m compares
Should be appreciated that the specific embodiment described above only is used for explaining the present invention, be not intended to limit the present invention.The apparent variation of being extended out by spirit of the present invention or change still are among protection scope of the present invention.
Claims (5)
1. a biaxial tension applies the optics basement membrane online, it is characterized in that: comprising three-layer co-extruded polyester base film and being coated at least one lip-deep thickness of polyester base film is the coating of 1-10 μ m; To be the A/B/A structure be made of two top layers and the sandwich layer between two top layers of co-extrusion described three-layer co-extruded polyester film; Top layer and sandwich layer component are 100% pet resin, and its intrinsic viscosity is 0.68 ± 0.02dL/g, and colourity b value is-3 ~+2, and top layer and sandwich layer all do not contain antiblocking agent.
2. a kind of biaxial tension according to claim 1 applies the optics basement membrane online, it is characterized in that: described three-layer co-extruded polyester film gross thickness is at 0.10-0.20mm, and skin depth is at 0.010-0.025mm, and its two skin depth equates.
3. a kind of biaxial tension according to claim 1 applies the optics basement membrane online, it is characterized in that: described coating adopts polyurethanes water-based coating liquid, comprise average grain diameter at the cataloid of 40 ~ 50nm, and the micron silica of particle diameter 1 ~ 6 μ m.
4. a kind of biaxial tension according to claim 3 applies the optics basement membrane online, it is characterized in that: described polyurethanes water-based coating liquid is made by the following method, after the polyurethane polymer dilute with water, add wherein nanoscale cataloid and micron silica, and add ethylene glycol monobutyl ether, surfactant and curing agent, and be 7.2 ~ 8.0 with the pH value of acid-base modifier adjustment coating liquid; Each constituent mass percentage that obtains in coating liquid as follows: polyurethane polymer 20-35%, nanoscale cataloid 0.1 ~ 1%, micron silica 0.02 ~ 0.5%, ethylene glycol monobutyl ether 0.5-3%, surfactant 0.01-0. 2%, curing agent 5-15%, a small amount of soda acid blender surplus is pure water.
5. a biaxial tension applies the preparation method of optics basement membrane online, comprises the steps:
1) sandwich layer and top layer PET raw material are carried out drying 2 ~ 4h at 120 ~ 180 ℃ of temperature, because the hydrolysis reflection at high temperature easily occurs in polyester, must drying before using, water content should≤45ppm;
2) sandwich layer PET raw material is sent into twin-screw and go out melting in machine, simultaneously, top layer PET raw material is sent into melting in another double screw extruder, sandwich layer melt and top layer melt melt extrude in two extruders, through melt pipe, measuring pump, filter to the co-extrusion module, extrude sheet from die head by 3 layers of T die heads mouth mould inner sandwich layer melt top layer melt after through three layers of distributor, die head temperature is controlled at 278-282 ℃, when sheet is extruded, linear velocity is controlled at 8-15m/min, with the slab roller and the cold wind that pass into lower than 20 ℃ of temperature water, sheet is carried out cooling slab;
3) sheet is carried out longitudinal stretching, namely in the film movement direction, first the roller by 60-80 ℃ of temperature carries out preheating, carry out the infrared heater heating of 110-150 ℃, and carrying out longitudinal stretching under the vertical stretching ratio of the linear velocity of 0.2m/s-1.1m/s, 3.0-3.4:1, stretching time is less than 0.2s;
4) sheet after longitudinal stretching applies its at least one surface by coating machine;
5) carry out cross directional stretch, the i.e. direction vertical with film movement, send in heating cabinet to carry out preheating at the temperature of 100-120 ℃, time is controlled at 10-60s, then carries out cross directional stretch under the cross directional stretch multiplying power of the temperature 3.0-3.5:1 of 110-160 ℃, and the time is controlled at 10-60s, then carrying out thermal finalization under the condition of 190-230 ℃ processes, processing time is 10-60s, film is relaxed cooling, and temperature is at 25 ~ 160 ℃;
6) rolling makes polyester film, and overall film thickness is at 0.10-0.20mm.
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| CN2013100749059A CN103171223A (en) | 2013-03-11 | 2013-03-11 | Bidirectional-stretching online-coating optical base film and its making method |
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| CN2013100749059A CN103171223A (en) | 2013-03-11 | 2013-03-11 | Bidirectional-stretching online-coating optical base film and its making method |
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| CN103481521A (en) * | 2013-08-30 | 2014-01-01 | 山东通佳机械有限公司 | Double-shaft orientation stretched breathable membrane production device and production method |
| CN104893525A (en) * | 2015-05-26 | 2015-09-09 | 张家港康得新光电材料有限公司 | Coating liquid and hardened polyester film |
| CN105295673A (en) * | 2015-10-10 | 2016-02-03 | 常州百佳薄膜科技有限公司 | BOPET (Biax Orientation Polyester Film) conductive and antistatic online coating solution, BOPET film and online coating process |
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Application publication date: 20130626 |