CN102744945A - Polyester film with adhesion resisting function and preparation method of polyester film - Google Patents
Polyester film with adhesion resisting function and preparation method of polyester film Download PDFInfo
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- CN102744945A CN102744945A CN2012102578746A CN201210257874A CN102744945A CN 102744945 A CN102744945 A CN 102744945A CN 2012102578746 A CN2012102578746 A CN 2012102578746A CN 201210257874 A CN201210257874 A CN 201210257874A CN 102744945 A CN102744945 A CN 102744945A
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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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- Manufacture Of Macromolecular Shaped Articles (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
Abstract
The invention discloses a polyester film with an adhesion resisting function. The polyester film is of a structure comprising a layer A, a layer B and a layer C, wherein the layer A and the layer C are surface layers; the layer B is a core layer; the layer A comprises the components of 65-80 percent of polyester slice for a general film and 20-30 percent of general adhesion resisting agent; the layer B comprises the components of 80-85 percent of master batch polyester slice for a functional film, 3-5 percent of general adhesion resisting master batch and 12-15 percent of high-performance adhesion resisting agent; and the layer C comprises the components of 50-65 percent of polyester slice for the general film and 35-50 percent of general adhesion resisting agent. The high heat resistance and excellent adhesion resistance are achieved by the steps of slicing, mixing, melting co-extrusion, longitudinal drawing, transverse drawing, drawing and trimming, coiling, splitting and forming a finished product. The products prepared by the preparation method disclosed by the invention is environment-friendly and can be directly recycled, so that the pollution to the environment is reduced; and the polyester film can be widely applied to packaging of cakes, seasonings, fast foods and candies and packaging of medical products.
Description
Technical field
The present invention relates to a kind of three-layer co-extruded biaxial tension PET film and preparation method thereof, be specifically related to a kind of antiblock functional polyester film and preparation method thereof.
Background technology
Polyester film is as the infant industry material, and its application is still being expanded constantly.The polyester film industry of China follows the paces of developed country closely and combines autonomous innovation; Make full use of the superperformance and the characteristics that meet environmental protection requirement of polyester film material; Widely popularize and guide consumption, impel the application of polyester film more extensive, market demand is soaring year by year.
One Chinese patent application 201019026142.4 discloses a kind of light diffusion polyester basement membrane with antiblock masterbatch and method for manufacturing thin film thereof; Said film with the antiblocking agent masterbatch as additive; ABA type high transparent polyester film (the A layer is a main body with the polyester, and contains 0.02～0.2wt% polystyrene crosslinked microsphere, and the B layer is a polyester) through multi-layer co-extruded, casting sheet, stretch processes preparation; When obtaining good adhesion inhibiting properties; The film light transmittance improves, and mist degree descends, and production efficiency and operating flexibility also improve.
Chinese patent ZL200820037508.9 discloses a kind of high-strength reduction polyester packages film; Its film is processed through three-layer co-extruded and biaxial tension corona treatment; The intermediate layer is a polyester layer; Two superficial layers are the polyester layer that contains antiblocking agent, and thickness is at 6～9 μ m, and this utility model high-strength reduction polyester packages film has greatly reduced the thickness of film and can reach the instructions for use of packing etc.
But above two kinds of methods all are to use the conventional polyester film, and high added value and deep processed product are few.This situation makes domestic PET industry be confined to the harmful competition of low level on the one hand, is unfavorable for the development of whole industry, and on the other hand, the conventional polyester film gradually becomes the gesture of atrophy on the international market, then to high added value, deep processed product development.Domestic polyester film industry has only the requirement that adapts to international market film diversification of varieties, develops the high-end product of differentiation, high added value energetically, could squeeze the body international market, on global polyester film market, enhances the competitiveness.
Summary of the invention
The present invention is directed to the problems referred to above, researched and developed a kind of antiblock functional polyester film and preparation method thereof, purpose is: through corresponding adjustment stretch processes, effectively change conventional films and reach the good resistance adhesive.
Technical solution of the present invention: a kind of antiblock functional polyester film is characterized in that: said antiblock functional polyester film is A, B, C three-decker, and wherein A layer and C layer are superficial layer, and the B layer is a sandwich layer, and the material component weight proportion of each layer is:
The A layer: normal film is used polyester slice: 65～80%;
General caking inhibiter: 20～35%;
The B layer: functional membrane is used the masterbatch polyester slice: 80～85%;
Antiblock masterbatch: 3～5%;
High-performance caking inhibiter: 12～15%;
The C layer: normal film is used polyester slice: 50～65%;
General caking inhibiter: 35～50%.
Said antiblock functional polyester film thickness is 20～50 μ m.
The thickness ratio of said A layer, B layer and C layer is: 2～5: 16～40: 2～5.
Said general caking inhibiter is titanium dioxide, silica, magnesium acetate, calcium carbonate, calcium phosphate, barium sulfate, kaolin or SiO
2/ TiO
2Composite granule.
Said high-performance caking inhibiter is the caking inhibiter with higher melt.
Said normal film is with the preparation process of polyester slice: highly purified terephthalic acid (TPA) and ethylene glycol are dropped in the agitated reactor in the 1:1mol ratio, carry out esterification, in ending phase, again with nanoscale SiO
2Ethylene glycol dispersion, magnesium acetate ethylene glycol dispersion import batch condensation polymerization reactor, add condensate continuously and obtain containing nanoscale SiO
2The normal film of caking inhibiter, magnesium acetate caking inhibiter is used polyester slice, through stretching, granulation, makes the normal film that contains general caking inhibiter and uses polyester slice then; The polyester building-up process comprises esterification and polycondensation reaction, when reaction, adds functional additive, catalyst and stabilizing agent.
Said nanoscale SiO
2Addition be 2500～3800ppm, nanoscale SiO
2Average grain diameter is between 80～120nm.
Said functional additive is mainly general caking inhibiter and high-performance caking inhibiter, and additive stirs and grinds through surface treatment, high speed centrifugation earlier, it is dispersed in the ethylene glycol, and then adds in the polymerization system continuously; In grinding dispersion process, add dispersant, dispersant is a kind of in sodium polyphosphate, the potassium polyphosphate, its addition is with respect to 0.1%～0.5% of additive quality.
Said catalyst is the compound of germanium, antimony, titanium or their organic complex, and its addition is with respect to 0.01～0.09% of polyester quality.
Said functional membrane is with the preparation process of masterbatch polyester slice: highly purified terephthalic acid (TPA) and ethylene glycol are dropped in the agitated reactor in the 1:1mol ratio, and direct esterification, polycondensation add nanoscale SiO in the esterification ending phase
2The antiblock masterbatch of ethylene glycol dispersion, nano kaoline ethylene glycol dispersion and 3%～5% ratio adds condensate continuously and obtains containing nanoscale SiO
2The polyester for film of the high-performance caking inhibiter of/nano kaoline/antiblock masterbatch through stretching, granulation, makes the functional membrane that contains the high-performance caking inhibiter and uses the masterbatch polyester slice then; The polyester building-up process comprises esterification and polycondensation reaction, when reaction, adds functional additive, catalyst and stabilizing agent.
Said nano kaoline addition is 2～1000 ppm.
The particle diameter of said nano kaoline in film is distributed as 0.2～0.5 μ m.
Said nanoscale SiO
2The preparation process of ethylene glycol dispersion is: at first to nanoscale SiO
2Carry out surface treatment, stir, grind through high speed centrifugation then, and process uniform nanoscale SiO through the ultrasonic dispersing method
2The ethylene glycol dispersion.
The preparation process of said nano kaoline ethylene glycol dispersion is: at first nano kaoline is carried out surface treatment, stir, grind through high speed centrifugation then and process uniform nano kaoline ethylene glycol dispersion through the ultrasonic dispersing method.
The preparation process of said magnesium acetate ethylene glycol dispersion is: at first Dichlorodiphenyl Acetate magnesium carries out surface treatment, stirs, grinds through high speed centrifugation then and process uniform magnesium acetate ethylene glycol dispersion through the ultrasonic dispersing method.
A kind of preparation method of antiblock functional polyester film may further comprise the steps.
1, section, batch mixing:
With normal film with polyester slice, reclaim the rim charge that granulation section and online side cut pulverize and add blending bunker with the 80%:10%:10% ratio, through the mixing that stirs, Weighing is laggard goes into main extruder; Normal film with 20% is mixed entering auxilliary extruder in back with the functional membrane of polyester slice and 80% with the masterbatch polyester slice.
2, fusion co-extrusion:
The component of A, B, each layer of C is put into respectively in each self-corresponding double screw extruder by above-mentioned percentage by weight, raw materials melt is extruded;
Raw material plastifies under the effect of double screw extruder, mixing, melt evenly is distributed as ABC three laminar flows and goes out in die head, its mesexine A, C layer are the melt of auxilliary extruder, the B layer is the melt of main extruder, die head temperature is 278 ℃～285 ℃; With the cold water cooling, surface temperature control is at 25 ℃～27 ℃ in the slab roller, and rapid cooling curing becomes sheet to the melt of outflow on the slab roller surface.
3, longitudinal stretching:
On longitudinal stretching machine, be drawn into film, draft temperature is 113～116 ℃, and multiplying power is 4.5～4.6; Film through longitudinal stretching carries out thermal finalization on one group of chill roll surface, and setting temperature is 238～242 ℃, shaping time 5～6 seconds.
4, cross directional stretch:
Film gets into the cross directional stretch machine behind longitudinal stretching, draft temperature is 108～120 ℃, and the horizontal multiplying power of drawing is 3.9～4.1, and the film after the stretching carries out thermal finalization, cooling through one group of chill roll surface, 238～242 ℃ of setting temperatures, shaping time 5～6 seconds.
5, traction is cut edge:
The film that forms is again through corona treatment, and horizontal then film of pulling out mouthful gets into the Traction Station, and to the film edge rest and reorganization of cutting edge, the fabric width of film is 8700mm to the edge device in the Traction Station, draws to winder then through edge-trimming cutter.
6, rolling:
Through winder with the basement membrane rolling; The rolling station is distributed in cuts the roller both sides, between on the station of both sides
At a distance from rolling; The basement membrane thickness ratio is processed in rolling: 2～5: 16～40: 2～5.
7, cut:
Basement membrane draws to cutter from unwinding rack, guarantees the tension force and the flattening of basement membrane in the process, is cutting the specification that roller place basement membrane slitting one-tenth needs.
8, finished product:
With the finished product packing of rolling, the back warehouse-in of weighing.
Beneficial effect of the present invention.
1, the antiblock functional polyester film of the present invention's preparation, thickness is 20～50 μ m, fabric width reaches 8700mm, hot strength>=200MPa (between 200～235MPa), laterally percent thermal shrinkage≤0.5%; High-fire resistance is 10min in 180 ℃ of constant temperature, and film surface does not have significant change; The excellent anti adhesive is placed 3h in 70 ℃ ± 2 ℃ baking oven, when separating film, film surface has no adhesion phenomenon; Fabric width 8700mm can be widely used in light packaging for foodstuff and pharmaceuticals packings such as cake, flavouring, fast food, candy.
2, adopt special masterbatch to add mode; In prescription, further introducing the high-performance caking inhibiter again makes film have characteristics such as better heat endurance, surface-active and mechanical conformability; Effectively change conventional films and will reach the good resistance adhesive, need impact to increase moistened surface tension force or adopt and be coated with mode outward, increase sliding property agent etc. through strengthening the film surface corona; The Product Green environmental protection can directly be recycled, and reduces environmental pollution, also meets current country and advocates energy-saving and cost-reducing demand for development, after printing or aluminizing.
The specific embodiment
Below in conjunction with embodiment the present invention is described further.
Embodiment one:
Use polyester slice and the functional membrane that contains 15% high-performance caking inhibiter to use masterbatch polyester slice, 5% antiblock masterbatch and the normal film that contains 50% general caking inhibiter uses polyester slice to be raw material with the normal film that contains 35% general caking inhibiter, each layer raw and auxiliary material weight ratio is the A layer: common polyester for film 65%, general caking inhibiter 35%; The B layer: functional membrane is with masterbatch polyester slice 80%, antiblock masterbatch 5%, high-performance caking inhibiter 15%; C layer: common polyester for film 50%, general caking inhibiter 50%.
1, section:
The normal film that contains general caking inhibiter is used polyester slice: drop in the agitated reactor in the 1:1mol ratio through highly purified terephthalic acid (TPA) and ethylene glycol, carry out esterification, in ending phase, again with nanoscale SiO
2Ethylene glycol dispersion, magnesium acetate ethylene glycol dispersion import batch condensation polymerization reactor, add condensate continuously and obtain containing nanoscale SiO
2The normal film of caking inhibiter, magnesium acetate caking inhibiter is used polyester slice, makes the normal film that contains general caking inhibiter and uses polyester slice through stretching, granulation then; Nanoscale SiO
2Addition be 2500～3800ppm, nanoscale SiO
2Average grain diameter is between 80～120nm.
The functional membrane that contains the high-performance caking inhibiter is used the masterbatch polyester slice: highly purified terephthalic acid (TPA) and ethylene glycol are dropped in the agitated reactor in the 1:1mol ratio, and direct esterification, polycondensation add nanoscale SiO in the esterification ending phase
2The antiblock masterbatch of ethylene glycol dispersion, nano kaoline ethylene glycol dispersion and 3%～5% ratio adds condensate continuously and obtains containing nanoscale SiO
2The polyester for film of the high-performance caking inhibiter of/nano kaoline/certain proportion antiblock masterbatch through stretching, granulation, makes the functional membrane that contains the high-performance caking inhibiter and uses the masterbatch polyester slice then; The nano kaoline addition is 2～1000 ppm, and the particle diameter of nano kaoline in film is distributed as 0.2～0.5 μ m;
Pet reaction comprises esterification and polycondensation reaction, when reaction, adds functional additive, catalyst and stabilizing agent.Additive is mainly general caking inhibiter and high-performance caking inhibiter, and additive stirs and grinds through surface treatment, high speed centrifugation earlier, it is dispersed in the ethylene glycol, and then adds in the polymerization system continuously.In grinding dispersion process, add dispersant, dispersant is a kind of in sodium polyphosphate, the potassium polyphosphate, its addition is with respect to 0.1%～0.5% of additive quality.Catalyst is the compound of germanium, antimony, titanium or their organic complex, and its addition is with respect to 0.01～0.09% of polyester quality.
Nanoscale SiO
2The preparation process of ethylene glycol dispersion is: at first to nanoscale SiO
2Carry out surface treatment, stir, grind through high speed centrifugation then, and process uniform nanoscale SiO through the ultrasonic dispersing method
2The ethylene glycol dispersion.
The preparation process of nano kaoline ethylene glycol dispersion is: at first nano kaoline is carried out surface treatment, stir, grind through high speed centrifugation then and process uniform nano kaoline ethylene glycol dispersion through the ultrasonic dispersing method;
The preparation process of magnesium acetate ethylene glycol dispersion is: at first Dichlorodiphenyl Acetate magnesium carries out surface treatment, stirs, grinds through high speed centrifugation then and process uniform magnesium acetate ethylene glycol dispersion through the ultrasonic dispersing method.
2, batch mixing:
With normal film with polyester slice, reclaim the rim charge that granulation section and online side cut pulverize and add blending bunker with the 80%:10%:10% ratio, through the mixing that stirs, Weighing is laggard goes into main extruder; Normal film with 20% is mixed entering auxilliary extruder in back with the functional membrane of polyester slice and 80% with the masterbatch polyester slice.
3, fusion co-extrusion:
The component of A, B, each layer of C put into respectively in each self-corresponding double screw extruder by above-mentioned percentage by weight melt extrude; Raw material plastifies under the effect of double screw extruder, mixing; Melt evenly is distributed as ABC three laminar flows and goes out in die head; Its mesexine A, C layer are the melt of auxilliary extruder, and the B layer is the melt of main extruder, and die head temperature is 278 ℃～285 ℃; With the cold water cooling, surface temperature control is at 25 ℃～27 ℃ in the slab roller, and rapid cooling curing becomes sheet to the melt of outflow on the slab roller surface.
4, longitudinal stretching:
On longitudinal stretching machine, be drawn into film, draft temperature is 113～116 ℃, and multiplying power is 4.5～4.6; Film through longitudinal stretching carries out thermal finalization on one group of chill roll surface, and setting temperature is 238～242 ℃, shaping time 5～6 seconds.
5, cross directional stretch:
Film gets into the cross directional stretch machine behind longitudinal stretching, draft temperature is 108～120 ℃, and the horizontal multiplying power of drawing is 3.9～4.1, and the film after the stretching carries out thermal finalization, cooling through one group of chill roll surface, 238～242 ℃ of setting temperatures, shaping time 5～6 seconds.
6, traction is cut edge:
The film that forms is again through corona treatment, and horizontal then film of pulling out mouthful gets into the Traction Station, and to the film edge rest and reorganization of cutting edge, the fabric width of film is 8700mm to the edge device in the Traction Station, draws to winder then through edge-trimming cutter.
7, rolling:
Through winder with the basement membrane rolling; The rolling station is distributed in cuts the roller both sides, rolling at interval on the station of both sides; The basement membrane thickness ratio is processed in rolling: 2～5: 16～40: 2～5.
8, cut:
Basement membrane draws to cutter from unwinding rack, guarantees the tension force and the flattening of basement membrane in the process, is cutting the specification that roller place basement membrane slitting one-tenth needs.
9, finished product:
With the finished product packing of rolling, the back warehouse-in of weighing.
Embodiment two:
Use polyester slice and the functional membrane that contains 12% high-performance caking inhibiter to use masterbatch polyester slice, 3% antiblock masterbatch and the normal film that contains 35% general caking inhibiter uses polyester slice to be raw material with the normal film that contains 20% general caking inhibiter, each layer raw and auxiliary material weight ratio is the A layer: common polyester for film 80%, general caking inhibiter 20%; The B layer: functional membrane is with masterbatch polyester slice 85%, antiblock masterbatch 3%, high-performance caking inhibiter 12%; C layer: common polyester for film 65%, general caking inhibiter 35%.
1, section:
The normal film that contains general caking inhibiter is used polyester slice: drop in the agitated reactor in the 1:1mol ratio through highly purified terephthalic acid (TPA) and ethylene glycol, carry out esterification, in ending phase, again with nanoscale SiO
2Ethylene glycol dispersion, magnesium acetate ethylene glycol dispersion import batch condensation polymerization reactor, add condensate continuously and obtain containing nanoscale SiO
2The normal film of caking inhibiter, magnesium acetate caking inhibiter is used polyester slice, then through stretching, granulation; Nanoscale SiO
2Addition be 2500～3800ppm, nanoscale SiO
2Average grain diameter is between 80～120nm.
The functional membrane that contains the high-performance caking inhibiter is used the masterbatch polyester slice: through the method for highly purified terephthalic acid (TPA) and ethylene glycol direct esterification, polycondensation, add nanoscale SiO in the esterification ending phase
2The antiblock masterbatch of ethylene glycol dispersion, nano kaoline ethylene glycol dispersion and 3%～5% ratio adds condensate continuously and obtains containing nanoscale SiO
2The polyester for film of the high-performance caking inhibiter of/nano kaoline/certain proportion antiblock masterbatch is then through stretching, granulation; The nano kaoline addition is 2～1000 ppm, and the particle diameter of nano kaoline in film is distributed as 0.2～0.5 μ m;
Pet reaction comprises esterification and polycondensation reaction, when reaction, adds functional additive, catalyst and stabilizing agent.Additive is mainly general caking inhibiter and high-performance caking inhibiter, and additive stirs and grinds through surface treatment, high speed centrifugation earlier, it is dispersed in the ethylene glycol, and then adds in the polymerization system continuously.In grinding dispersion process, add dispersant, dispersant is a kind of in sodium polyphosphate, the potassium polyphosphate, its addition is with respect to 0.1%～0.5% of additive quality.Catalyst is the compound of germanium, antimony, titanium or their organic complex, and its addition is with respect to 0.01～0.09% of polyester quality.
Nanoscale SiO
2The preparation process of ethylene glycol dispersion is: at first to nanoscale SiO
2Carry out surface treatment, stir, grind through high speed centrifugation then, and process uniform nanoscale SiO through the ultrasonic dispersing method
2The ethylene glycol dispersion.
The preparation process of nano kaoline ethylene glycol dispersion is: at first nano kaoline is carried out surface treatment, stir, grind through high speed centrifugation then and process uniform nano kaoline ethylene glycol dispersion through the ultrasonic dispersing method;
The preparation process of magnesium acetate ethylene glycol dispersion is: at first Dichlorodiphenyl Acetate magnesium carries out surface treatment, stirs, grinds through high speed centrifugation then and process uniform magnesium acetate ethylene glycol dispersion through the ultrasonic dispersing method.
2, batch mixing:
With normal film with polyester slice, reclaim the rim charge that granulation section and online side cut pulverize and add blending bunker with the 80%:10%:10% ratio, through the mixing that stirs, Weighing is laggard goes into main extruder; Normal film with 20% is mixed entering auxilliary extruder in back with the functional membrane of polyester slice and 80% with the masterbatch polyester slice.
3, fusion co-extrusion:
The component of A, B, each layer of C put into respectively in each self-corresponding double screw extruder by above-mentioned percentage by weight melt extrude; Raw material plastifies under the effect of double screw extruder, mixing; Melt evenly is distributed as ABC three laminar flows and goes out in die head; Its mesexine A, C layer are the melt of auxilliary extruder, and the B layer is the melt of main extruder, and die head temperature is 278 ℃～285 ℃; With the cold water cooling, surface temperature control is at 25 ℃～27 ℃ in the slab roller, and rapid cooling curing becomes sheet to the melt of outflow on the slab roller surface.
4, longitudinal stretching:
On longitudinal stretching machine, be drawn into film, draft temperature is 113～116 ℃, and multiplying power is 4.5～4.6; Film through longitudinal stretching carries out thermal finalization on one group of chill roll surface, and setting temperature is 238～242 ℃, shaping time 5～6 seconds.
5, cross directional stretch:
Film gets into the cross directional stretch machine behind longitudinal stretching, draft temperature is 108～120 ℃, and the horizontal multiplying power of drawing is 3.9～4.1, and the film after the stretching carries out thermal finalization, cooling through one group of chill roll surface, 238～242 ℃ of setting temperatures, shaping time 5～6 seconds.
6, traction is cut edge:
The film that forms is again through corona treatment, and horizontal then film of pulling out mouthful gets into the Traction Station, and to the film edge rest and reorganization of cutting edge, the fabric width of film is 8700mm to the edge device in the Traction Station, draws to winder then through edge-trimming cutter.
7, rolling:
Through winder with the basement membrane rolling; The rolling station is distributed in cuts the roller both sides, rolling at interval on the station of both sides; The basement membrane thickness ratio is processed in rolling: 2～5: 16～40: 2～5.
8, cut:
Basement membrane draws to cutter from unwinding rack, guarantees the tension force and the flattening of basement membrane in the process, is cutting the specification that roller place basement membrane slitting one-tenth needs.
9, finished product:
With the finished product packing of rolling, the back warehouse-in of weighing.
Claims (16)
1. antiblock functional polyester film, it is characterized in that: said antiblock functional polyester film is A, B, C three-decker, and wherein A layer and C layer are superficial layer, and the B layer is a sandwich layer, and the material component weight proportion of each layer is:
The A layer: normal film is used polyester slice: 65～80%;
General caking inhibiter: 20～35%;
The B layer: functional membrane is used the masterbatch polyester slice: 80～85%;
Antiblock masterbatch: 3～5%;
High-performance caking inhibiter: 12～15%;
The C layer: normal film is used polyester slice: 50～65%;
General caking inhibiter: 35～50%.
2. a kind of antiblock functional polyester film as claimed in claim 1 is characterized in that: said antiblock functional polyester film thickness is 20～50 μ m.
3. a kind of antiblock functional polyester film as claimed in claim 1 is characterized in that: the thickness ratio of said A layer, B layer and C layer is: 2～5: 16～40: 2～5.
4. a kind of antiblock functional polyester film as claimed in claim 1, it is characterized in that: said general caking inhibiter is titanium dioxide, silica, magnesium acetate, calcium carbonate, calcium phosphate, barium sulfate, kaolin or SiO
2/ TiO
2Composite granule.
5. a kind of antiblock functional polyester film as claimed in claim 1, it is characterized in that: said high-performance caking inhibiter is the caking inhibiter with higher melt.
6. a kind of antiblock functional polyester film as claimed in claim 1; It is characterized in that: said normal film is with the preparation process of polyester slice: highly purified terephthalic acid (TPA) and ethylene glycol are dropped in the agitated reactor in the 1:1mol ratio; Carry out esterification, in ending phase with nanoscale SiO
2Ethylene glycol dispersion, magnesium acetate ethylene glycol dispersion import batch condensation polymerization reactor, add condensate continuously and obtain containing nanoscale SiO
2The normal film of caking inhibiter, magnesium acetate caking inhibiter is used polyester slice, through stretching, granulation, makes the normal film that contains general caking inhibiter and uses polyester slice then; The polyester building-up process comprises esterification and polycondensation reaction, when reaction, adds functional additive, catalyst and stabilizing agent.
7. a kind of antiblock functional polyester film as claimed in claim 6 is characterized in that: said nanoscale SiO
2Addition be 2500～3800ppm, nanoscale SiO
2Average grain diameter is between 80～120nm.
8. a kind of antiblock functional polyester film as claimed in claim 1; It is characterized in that: said functional membrane is with the preparation process of masterbatch polyester slice: highly purified terephthalic acid (TPA) and ethylene glycol are dropped in the agitated reactor in the 1:1mol ratio; Direct esterification, polycondensation add nanoscale SiO in the esterification ending phase
2The antiblock masterbatch of ethylene glycol dispersion, nano kaoline ethylene glycol dispersion and 3%～5% ratio adds condensate continuously and obtains containing nanoscale SiO
2The polyester for film of the high-performance caking inhibiter of/nano kaoline/antiblock masterbatch through stretching, granulation, makes the functional membrane that contains the high-performance caking inhibiter and uses the masterbatch polyester slice then; The polyester building-up process comprises esterification and polycondensation reaction, when reaction, adds functional additive, catalyst and stabilizing agent.
9. like claim 6 or 8 described a kind of antiblock functional polyester films, it is characterized in that: said catalyst is the compound of germanium, antimony, titanium or their organic complex, and its addition is with respect to 0.01～0.09% of polyester quality.
10. a kind of antiblock functional polyester film as claimed in claim 8, it is characterized in that: said nano kaoline addition is 2～1000 ppm.
11. a kind of antiblock functional polyester film as claimed in claim 8, it is characterized in that: the particle diameter of said nano kaoline in film is distributed as 0.2～0.5 μ m.
12. a kind of antiblock functional polyester film as claimed in claim 6 is characterized in that: said nanoscale SiO
2The preparation process of ethylene glycol dispersion is: at first to nanoscale SiO
2Carry out surface treatment, stir, grind through high speed centrifugation then, and process uniform nanoscale SiO through the ultrasonic dispersing method
2The ethylene glycol dispersion.
13. like claim 6 or 8 described a kind of antiblock functional polyester films; It is characterized in that: said functional additive is mainly general caking inhibiter and high-performance caking inhibiter; Additive stirs and grinds through surface treatment, high speed centrifugation earlier; It is dispersed in the ethylene glycol, and then adds in the polymerization system continuously; In grinding dispersion process, add dispersant, dispersant is a kind of in sodium polyphosphate, the potassium polyphosphate, its addition is with respect to 0.1%～0.5% of additive quality.
14. a kind of antiblock functional polyester film as claimed in claim 8; It is characterized in that: the preparation process of said nano kaoline ethylene glycol dispersion is: at first nano kaoline is carried out surface treatment, stir, grind through high speed centrifugation then and process uniform nano kaoline ethylene glycol dispersion through the ultrasonic dispersing method.
15. a kind of antiblock functional polyester film as claimed in claim 6; It is characterized in that: the preparation process of said magnesium acetate ethylene glycol dispersion is: at first Dichlorodiphenyl Acetate magnesium carries out surface treatment, stirs, grinds through high speed centrifugation then and process uniform magnesium acetate ethylene glycol dispersion through the ultrasonic dispersing method.
16. prepare a kind of antiblock functional polyester film as claimed in claim 1, may further comprise the steps:
A, section, batch mixing:
With normal film with polyester slice, reclaim the rim charge that granulation section and online side cut pulverize and add blending bunker with the 80%:10%:10% ratio, through the mixing that stirs, Weighing is laggard goes into main extruder; Normal film with 20% is mixed entering auxilliary extruder in back with the functional membrane of polyester slice and 80% with the masterbatch polyester slice;
B, fusion co-extrusion:
The component of A, B, each layer of C is put into respectively in each self-corresponding double screw extruder by above-mentioned percentage by weight, raw materials melt is extruded; Raw material plastifies under the effect of double screw extruder, mixing, melt evenly is distributed as ABC three laminar flows and goes out in die head, its mesexine A, C layer are the melt of auxilliary extruder, the B layer is the melt of main extruder, die head temperature is 278 ℃～285 ℃; With the cold water cooling, surface temperature control is at 25 ℃～27 ℃ in the slab roller, and rapid cooling curing becomes sheet to the melt of outflow on the slab roller surface;
C, longitudinal stretching:
On longitudinal stretching machine, be drawn into film, draft temperature is 113～116 ℃, and multiplying power is 4.5～4.6; Film through longitudinal stretching carries out thermal finalization on one group of chill roll surface, and setting temperature is 238～242 ℃, shaping time 5～6 seconds;
D, cross directional stretch:
Film gets into the cross directional stretch machine behind longitudinal stretching, draft temperature is 108～120 ℃, and the horizontal multiplying power of drawing is 3.9～4.1, and the film after the stretching carries out thermal finalization, cooling through one group of chill roll surface, 238～242 ℃ of setting temperatures, shaping time 5～6 seconds;
E, traction are cut edge:
The film that forms is again through corona treatment, and horizontal then film of pulling out mouthful gets into the Traction Station, and to the film edge rest and reorganization of cutting edge, the fabric width of film is 8700mm to the edge device in the Traction Station, draws then to winder through edge-trimming cutter;
E, rolling:
Through winder with the basement membrane rolling; The rolling station is distributed in cuts the roller both sides, rolling at interval on the station of both sides; The basement membrane thickness ratio is processed in rolling: 2～5: 16～40: 2～5;
F, cut:
Basement membrane draws to cutter from unwinding rack, guarantees the tension force and the flattening of basement membrane in the process, is cutting the specification that roller place basement membrane slitting one-tenth needs;
G, finished product:
With the finished product packing of rolling, the back warehouse-in of weighing.
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