CN105563972B - A kind of scratch resistance polyester film and preparation method thereof - Google Patents

A kind of scratch resistance polyester film and preparation method thereof Download PDF

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Publication number
CN105563972B
CN105563972B CN201510997098.7A CN201510997098A CN105563972B CN 105563972 B CN105563972 B CN 105563972B CN 201510997098 A CN201510997098 A CN 201510997098A CN 105563972 B CN105563972 B CN 105563972B
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layer
scratch resistance
polyester film
film
sio
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CN105563972A (en
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孟繁寅
黄飞刚
黄伟光
秦寅华
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Hangzhou dadongnan hi tech new material Co., Ltd
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HANGZHOU DA DONG NAN GAOKE PACKAGING Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • 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
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
    • 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
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
    • C08L67/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/03—3 layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/24—All layers being polymeric
    • B32B2250/244—All polymers belonging to those covered by group B32B27/36
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/40—Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2264/00—Composition or properties of particles which form a particulate layer or are present as additives
    • B32B2264/10—Inorganic particles
    • B32B2264/102—Oxide or hydroxide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2305/00—Condition, form or state of the layers or laminate
    • B32B2305/30—Fillers, e.g. particles, powders, beads, flakes, spheres, chips
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/554—Wear resistance
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/584—Scratch resistance
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2315/00—Other materials containing non-metallic inorganic compounds not provided for in groups B32B2311/00 - B32B2313/04
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
    • C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
  • Laminated Bodies (AREA)

Abstract

The invention provides a kind of scratch resistance polyester film and preparation method thereof, the new polyester film has three laminates：Its upper epidermis is by PET polyester homopolymers, SiO2The anti-scratch layer that additive-based PET polyester and supra polymer silicone additives are formed；It is PET polyester homopolymers and SiO that the direct coextru-lamination of the anti-scratch layer, which has composition,2The sandwich layer of additive-based PET polyester；It is PET polyester homopolymers and SiO that the direct coextru-lamination in another surface of sandwich layer, which has composition,2The layer of additive-based PET polyester；The present invention uses coextruding method production technology, the processing process of current domestic scratch resistance (anti scuffing) polyester film can be greatly simplified, greatly reduce production cost, and because there is no coating process, therefore there is no solvent contamination, there is highly important market value and application value.

Description

A kind of scratch resistance polyester film and preparation method thereof
(1) technical field
The present invention relates to a kind of polyester film and preparation method thereof, and in particular to a kind of scratch resistance polyester film and its preparation Method.
(2) background technology
Last decade comes, with the development and progress of biaxially oriented polyester film production technology, various functions type polyester Film starts constantly to enter market, and is widely used in all types of industries field and the social life of people.
Called function type polyester film, be exactly outside the basic performance of original polyester film, by raw material, formula, with And the improvement of production technology or other production technology means, the performance of conventional polyester film is modified, makes what is produced Polyester film affix other performance or function outside the basic performance of original polyester film.
Scratch resistance (anti scuffing) polyester film is exactly a kind of typical functional form polyester film, and it is in conventional polyester film On the basis of the wearability and resistance to marring of film are improved by method physically or chemically.
At present, the known wearability for improving polyester film and the method for resistance to marring are the methods of coating, that is, logical Cross and one layer of hardened layer is coated with the surface of film to reach the purpose of raising wearability and resistance to marring.
Scratch resistance (anti scuffing) polyester film is widely used in all kinds of diaphragms, electronics and electric equipment products at present, particularly In plastic packaging film (card-protecting film) market, traditional conventional polyester film starts to face the challenge of scratch resistance (anti scuffing) polyester film, There is progressively substituted trend.
What the production of currently known scratch resistance (anti scuffing) polyester film was mainly realized by being coated with, that is, general The surface of logical polyester film applies last layer by the method for coating can improve the coating of polyester film wearability and resistance to marring, So as to form scratch resistance (anti scuffing) layer.Fig. 1 is scratch resistance (anti scuffing) the polyester film section signal of current rubbing method production Figure.
Subject matter existing for scratch resistance (anti scuffing) polyester film produced with rubbing method has：When complex process, two It is coating cost height, third, a series of coating quality problems such as coating uniform is bad are easily produced, fourth, can be because coating Solvent bank carrys out problem of environmental pollution, etc..
(3) content of the invention
The purpose of the present invention is：For the existing processing of scratch resistance (anti scuffing) polyester film of existing rubbing method production A series of deficiencies such as complex process, production cost are high, coating solvent pollution, propose a kind of poly- with wearability and resistance to marring Ester film and preparation method thereof, the preparation method of scratch resistance polyester film of the present invention and current rubbing method are entirely different, this hair Bright is to carry out surface modification to conventional polyester film by the method for co-extrusion, poly- with scratch resistance (anti scuffing) so as to produce Ester film.
To achieve the above object, the present invention adopts the following technical scheme that：
A kind of scratch resistance polyester film, it is made up of upper epidermis (anti-scratch layer), sandwich layer, layer (resist blocking and that layer), it is described Between upper epidermis and layer, the upper epidermis, sandwich layer, layer are integrally formed sandwich layer by heating coextru-lamination；Institute The composition of raw materials for stating each layer of scratch resistance polyester film is：
Gross mass based on upper epidermis, the upper epidermis are made up of the raw material of following mass percent：PET polyester homopolymers 75%~85%, SiO2Additive-based PET polyester 10%~20%, supra polymer silicone additives 5%~10%；
Gross mass based on sandwich layer, the sandwich layer are made up of the raw material of following mass percent：PET polyester homopolymers 70% ~85%, SiO2Additive-based PET polyester 15%~30%；
Gross mass based on layer, the layer are made up of the raw material of following mass percent：PET polyester homopolymers 75%~85%, SiO2Additive-based PET polyester 15%~25%；
In the raw material of above layers, described SiO2The SiO of additive-based PET polyester2Content is that 3000~7000ppm is (excellent Select 3000~4000pm).
Further, the anti-scratch layer of film of the present invention is not limited to upper epidermis, can also according to demand, and producing has (i.e. the composition of raw materials of layer replaces with the phase with upper epidermis to the two-sided scratch resistance polyester film on upper and lower two scratch resistance top layers Together), its cross-sectional view is shown in Fig. 3.
In the raw material of each layer of scratch resistance polyester film of the present invention, the quality index allusion quotation of described PET polyester homopolymers Offset is：Inherent viscosity 0.675ml/g, 260 degree of fusing point, molecular weight ranges 20000~30000.
Described SiO2The quality index representative value of additive-based PET polyester is：Inherent viscosity 0.645ml/g, fusing point 259 Degree, molecular weight ranges 20000~30000.
For the molecular weight of described supra polymer silicone additives generally 50~1,000,000, described supra polymer is organic Silicon additive concrete model such as DN08 (the big southeast group in Zhejiang), molecular weight ranges 80~1,000,000, melt index 33, wherein poly- Content of siloxane 20%, PET homopolymer contents 80%.
Scratch resistance polyester film of the present invention, its wearability and resistance to marring can be according to the supra polymer organosilicons of different proportion Additive level is adjusted, and its pencil hardness can reach more than 2H.
Under normal circumstances, the gross thickness of scratch resistance polyester film of the present invention is 12~75 μm, wherein, upper epidermis The thickness general control of (anti-scratch layer) is at 1.2~2.5 μm or so, and the thickness general control of layer (resist blocking and that layer) is in film 5%~10% or so of gross thickness.As needed, the thickness on upper and lower top layer can also control at 1.5~5.0 μm respectively simultaneously Within the scope of, and by adjusting the thickness of sandwich layer, the gross thickness for making polyester film is 50 μm.
Present invention also offers a kind of preparation method of the scratch resistance polyester film, described preparation method uses three layers Co-extruding biaxial stretched method, specifically comprises the following steps：
(1) after core layer raw material is well mixed according to formula rate, crystallized through ebullated bed, drying tower drying, subsequently into crowded Go out machine plasticizing into melt, melt filters through prefilter, measures pump-metered, main filter filtering again, then into three runners three Layer die head；
(2) after upper epidermis and the raw material of layer each uniformly mix according to formula rate, respectively enter each self-corresponding Double screw extruder is plastified into melt, and excludes steam and oligomer by the vacuum action of double screw extruder, then is distinguished Through prefilter, metering pump-metered, main filter filtering, three runners, three layers of die head are then respectively enterd；
(3) step (1) and the middle three layers of melt formed of step (2) flow out after three runner die heads converge, by Electrostatic Absorption Silk is pressed in the surface of chilling roller, is rapidly cooled into slab through chilling roller, slab stretches to form film through vertical and horizontal successively；
(4) step (3) stretching after film after shaping, cooling down, then through calibrator thickness measuring, the trimming of film side, sided corona treatment, Static elimination, finally wound, cut and get product.
The beneficial effects of the present invention are：The present invention uses coextrusion process, when producing conventional polyester film, in polyester The special type with scratch resistance (anti scuffing) function that a top layer (or two top layers) one layer of co-extrusion of film is compatible with polyester is added Agent functional layer, so as to greatly improve the wearability of conventional polyester film and resistance to marring, utilize the life of current conventional polyester film Producing line, scratch resistance (anti scuffing) polyester film is directly produced when producing conventional polyester and winning.
The production method and formula of the present invention, adding for current domestic scratch resistance (anti scuffing) polyester film can be greatly simplified Work technological process, greatly reduces production cost, and because there is no coating process, therefore there is no solvent contamination, with very Important market value and application value.
(4) illustrate
Fig. 1 is the diagrammatic cross-section of the scratch resistance polyester film of current rubbing method production；
Fig. 2 is the diagrammatic cross-section of scratch resistance polyester film of the present invention.
Fig. 3 is the diagrammatic cross-section of the two-sided scratch resistance polyester film of the present invention.
(5) embodiment
The present invention is further detailed below by specific embodiment, but protection scope of the present invention and not only limited In this.
Embodiment 1
A kind of scratch resistance polyester film, its membrane structure are three-layer co-extruded composite construction, as shown in Figure 2：This is new poly- Ester film has three laminates, and its upper epidermis is by PET polyester homopolymers, SiO2Additive-based PET polyester and superelevation point The anti-scratch layer that sub- silicone additives are formed；The direct coextru-lamination of the anti-scratch layer have composition for PET polyester homopolymers and SiO2The sandwich layer of additive-based PET polyester；The direct coextru-lamination in another surface of sandwich layer have composition for PET polyester homopolymers and SiO2The layer of additive-based PET polyester.
The new polyester film is by co-extruding biaxial stretched technique productions, below with 50um scratch resistances (anti scuffing) card-protecting film Production exemplified by illustrate.
Raw material sources used below are：The section of PET polyester homopolymers is purchased from Sinopec, model FG620；SiO2Add Formulation PET polyester slices are added to be purchased from Sinopec, model FG610；Supra polymer silicone additives are purchased from the big southeast collection in Zhejiang Group, model DN08.
The thickness of scratch resistance polyester film manufactured in the present embodiment is 50 μm, and the thickness and composition of raw materials of its each layer are as follows：
Upper epidermis (thickness is about 2.5 μm)：
PET polyester homopolymers section 144kg
SiO2Additive-based PET polyester slices 18kg, wherein SiO2Content is 3300ppm；
Supra polymer silicone additives 18kg；
Sandwich layer (thickness is about 43.3 μm)：
PET polyester homopolymers section 2652kg
SiO2Additive-based PET polyester slices 468kg, wherein SiO2Content is 3300ppm；
Layer (thickness is about 4.16 μm)：
PET polyester homopolymers section 240kg
SiO2Additive-based PET polyester slices 60kg, wherein SiO2Content is 3300ppm；
The production technology of the present embodiment film mainly comprises the following steps：
(1) after core layer raw material is well mixed according to formula rate, crystallized through ebullated bed, drying tower drying, subsequently into crowded Go out machine to plastify into melt at 275 DEG C, melt filters through prefilter, measures pump-metered, main Filtration Filtration again, then into three Three layers of die head of runner；
(2) after scratch resistance (anti scuffing) layer and the raw material of layer each uniformly mix according to formula rate, respectively enter Each self-corresponding double screw extruder plastifies at 275 DEG C forms melt, and is arranged by the vacuum action of double screw extruder Except steam and oligomer, then through prefilter, metering pump-metered, main Filtration Filtration, then respectively enter three runners, three layers of die head；
(3) step (1) and the middle three layers of melt formed of step (2) flow out after three runner die heads converge, by Electrostatic Absorption Silk is pressed in the surface of chilling roller, is rapidly cooled down through chilling roller and forms slab, and slab stretches (stretching times through vertical and horizontal successively Count respectively 3.3 and 3.8) form film；
(4) film after step (3) stretching is after shaping, cooling down, then through calibrator, the trimming of film side, sided corona treatment, electrostatic Eliminate, big film roll semi-finished product are wound into subsequently into winder；
(5) according to different clients demand, the semi-finished product of the big film roll that step (4) is wound into cut into different in width into Product.
50 μm scratch resistance (anti scuffing) polyester film produced by above-mentioned raw materials proportioning and process conditions, its is physical Energy index representative value is shown in Table 1.
Table 1
Except the embodiment that the present invention enumerates, such as other thickness, the product of formula, 23 μm, 30 μm, 36 μm, 42 μm, 50 μ M, scratch resistance (anti scuffing) polyester film of 75 μm of equal-specifications, as long as by domain knowledge adjustment related process.Wherein thickness Scope includes the full depth that current production technology can produce.
Above is realized using two-step stretch method biaxial tension processing technology, thickness is rapidly cooled into by chilling roller After piece, the synchro-draw method production for carrying out vertical and horizontal stretching simultaneously can also be used.
Scratch resistance (anti scuffing) polyester film of the present invention and preparation method thereof has the characteristics that：
(1) method for replacing being coated with present using co-extrusion method produces the functional polyalkylene with scratch resistance (anti scuffing) layer Ester film；
(2) three film layers or 2 layers, but at least two layers are not limited to；
(3) scratch resistance (anti scuffing) layer is located at the upper epidermis of layer structure film, can also be located at the following table of layer structure Layer, may be located on the upper and lower top layer of layer structure, so as to form two-sided scratch resistance (anti scuffing) polyester film；
(4) scratch resistance (anti scuffing) layer is using PET polyester homopolymers, SiO2Additive-based PET polyester and supra polymer have Machine silicon additive；
(5) the surface pencil hardness of film reaches more than 2H.

Claims (8)

1. a kind of scratch resistance polyester film, it is characterised in that described scratch resistance polyester film is by upper epidermis, sandwich layer, layer Form, the sandwich layer between upper epidermis and layer, the upper epidermis, sandwich layer, layer by heat coextru-lamination into It is integrated；The composition of raw materials of each layer of scratch resistance polyester film is：
Gross mass based on upper epidermis, the upper epidermis are made up of the raw material of following mass percent：PET polyester homopolymers 75% ~85%, SiO2Additive-based PET polyester 10%~20%, supra polymer silicone additives 5%~10%；
Gross mass based on sandwich layer, the sandwich layer are made up of the raw material of following mass percent：PET polyester homopolymers 70%~ 85%th, SiO2Additive-based PET polyester 15%~30%；
Gross mass based on layer, the layer are made up of the raw material of following mass percent：PET polyester homopolymers 75% ~85%, SiO2Additive-based PET polyester 15%~25%；
In the raw material of above layers, described SiO2The SiO of additive-based PET polyester2Content is 3000~7000ppm.
2. scratch resistance polyester film as claimed in claim 1, it is characterised in that the quality of described PET polyester homopolymers refers to Marking representative value is：Inherent viscosity 0.675ml/g, 260 degree of fusing point, molecular weight ranges 20000~30000.
3. scratch resistance polyester film as claimed in claim 1, it is characterised in that described SiO2The matter of additive-based PET polyester Figureofmerit representative value is：Inherent viscosity 0.645ml/g, 259 degree of fusing point, molecular weight ranges 20000~30000.
4. the scratch resistance polyester film as described in claim 1 or 3, it is characterised in that described SiO2Additive-based PET polyester SiO2Content is 3000~4000ppm.
5. scratch resistance polyester film as claimed in claim 1, it is characterised in that described supra polymer silicone additives Molecular weight is 50~1,000,000.
6. scratch resistance polyester film as claimed in claim 1, it is characterised in that the gross thickness of described scratch resistance polyester film For 12~75 μm, wherein, the thickness of upper epidermis is 1.2~2.5 μm, and the thickness of layer is the 5%~10% of overall film thickness.
7. scratch resistance polyester film as claimed in claim 1, it is characterised in that the thickness on the upper and lower top layer is respectively 1.5 ~5.0 μm, the gross thickness of polyester film is 50 μm.
8. a kind of preparation method of scratch resistance polyester film as claimed in claim 1, described preparation method comprise the following steps：
(1) after core layer raw material is well mixed according to formula rate, crystallized through ebullated bed, drying tower drying, subsequently into extruder Melt is plastified into, melt filters through prefilter, measures pump-metered, main filter filtering again, then into three runners, three layers of mould Head；
(2) after upper epidermis and the raw material of layer each uniformly mix according to formula rate, each self-corresponding double spiral shells are respectively enterd Bar extruder is plastified into melt, and excludes steam and oligomer by the vacuum action of double screw extruder, then respectively through pre- Filter, metering pump-metered, main filter filtering, then respectively enter three runners, three layers of die head；
(3) step (1) and the middle three layers of melt formed of step (2) flow out after three runner die heads converge, and are pressed by Electrostatic Absorption silk On the surface of chilling roller, slab is rapidly cooled into through chilling roller, slab stretches to form film through vertical and horizontal successively；
(4) film after step (3) stretching is after shaping, cooling down, then through calibrator thickness measuring, the trimming of film side, sided corona treatment, electrostatic Eliminate, finally wound, cut and get product.
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CN110452500B (en) * 2019-07-18 2022-02-11 嘉兴市科邦医用包装有限公司 Preparation method of easily-coated substrate film
CN110699001B (en) * 2019-10-12 2021-11-23 常州浩阳水性新材料有限公司 PET (polyethylene terephthalate) laminated adhesive film for card tape
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