BRPI0720817A2 - BIAXIALLY SUITABLE ORIENTED POLYPROPYLENE FILM FOR PAPER FREE GLAMING AND METHOD FOR PREPARING A SUITABLE ORIENTED POLYPROPYLENE FILM FOR PAPER - Google Patents

Description

I DESCRIPTIVE REPORT (original)

Technical field

The present invention relates to a biaxially oriented polypropylene film suitable for glue-free lamination with paper and a method of preparing it.

Prior art

At present, there are mainly the following various methods in the paper-plastic lamination industry: 10 bonding method (dry lamination and wet lamination), which can release toxic solvents to atmosphere to thereby seriously pollute the environment, solventless lamination method which results in a structure having a very low initial cohesion; 15, pre-coating method, involving procedures to thereby further increase the cost even though it is free of solvent. In addition, the bonding layer of the compound obtained by the above methods have a resistance dependent on the stripping time. Therefore, to overcome the disadvantages involved in laminating paper and plastic in the prior art, Chinese patent ZL03226653.7 discloses a paper-plastic composite structure comprising a paper layer and a laminated plastic film layer on the paper layer by hot pressing 25 which is formed by glue-free lamination of a biaxially oriented polypropylene film on the surface of a paper layer. While this patent discloses a glue-free composite structure of paper-plastic, it does not disclose the concrete composition of the film and a method of preparing it, so, in actual application, people have difficulty reproducing exactly the composite structure, and to extend its use in the technical field of paper-plastic lamination.

BACKGROUND OF THE INVENTION The object of the present invention is to overcome the disadvantages of the prior art and to provide a biaxially oriented oriented polypropylene film suitable for glue-free lamination with paper and a method of preparation thereof which performs glue-free lamination of paper and plastic. , simplify the lamination method, save the power source, and also be environmentally friendly and clean, and result in a product having good properties. To achieve the above objective, the present invention provides a biaxially oriented polypropylene film suitable for glue-free lamination with paper which is characterized in that the biaxially oriented polypropylene film comprises a surface layer, a core layer and a functional layer. located around and coextruded, the functional layer being directly laminated with paper, preprinted paper, or film including such a layer.

A top subsurface layer is located between the surface layer and the core layer. An underlying subsurface layer is located between the core layer and the functional layer.

The surface layer comprises a mixture comprising polypropylene and an antiblocking agent or a mixture comprising polypropylene, high density polyethylene and an antioxidant.

The core layer comprises 60-100% isotactic polypropylene or a mixture formed by isotactic polypropylene, if it has less than 100% amount and one or more selected from hydrogenated petroleum resin, antistatic agent and sliding agent. The underlying subsurface layer and the top subsurface layer comprise 60-100% isotactic polypropylene or a mixture formed by isotactic polypropylene, if less than 100%, and one or more selected hydrogenated petroleum resin, antistatic agent. and sliding agent.

One or more of the underlying subsurface layer, the core layer and the top subsurface layer comprise titanium dioxide.

One or more of the underlying subsurface layer, core layer and top subsurface layer comprise calcium carbonate and / or polybutylene terephthalate.

The functional layer comprises ethylene butene copolymer, ethylene octene copolymer, ethylene butene octene terpolymer, maleic anhydride graft modified ethylene butene copolymer, maleic anhydride graft modified ethylene octene copolymer, terpolymer of maleic anhydride graft-modified ethylene butene octene or mixtures thereof formed by any of the above copolymers or terpolymers, modified copolymers or terpolymers and mixtures with hydrogenated petroleum resin, the ethylene butene copolymer having a content of 10-30% butene; the ethylene octene copolymer has an octene content of 5-20%; ethylene-butene terpolymer has a butene content of 1-30% and an octene content of 1-20%; and the maleic anhydride graft modified ethylene butene copolymer, maleic anhydride graft modified ethylene octene copolymer, maleic anhydride graft modified ethylene butene octene terpolymer have a graft ratio of 0.5- 2%.

The hydrogenated petroleum resin is 1-30% by weight of the functional layer.

The functional layer represents 10-50% by weight of the film. A method of preparing the biaxially oriented oriented glue-free lamination polypropylene film 30 with paper in the present invention comprises the steps of: premixing the selected primary raw materials, modified materials and batch additives into a projected formulation; mix to make the mixed materials uniform; measure mixed materials; send them into an extruder and plasticize them to be a homogeneous melt; transfer the melt through one pass; filtering the melt through a filter; distribute the melt via flow block to a matrix; then producing the film by flat die process, i.e. cooling the extruded melt to form a molten sheet, and then biaxially orienting the molten sheet first longitudinally and then transversely or

longitudinally and transversely in sync to form a film, or by bubble forming process, i.e. cooling the melt after leaving the matrix 10 to form an initial bubble, and then blowing transversely and orienting the initial bubble longitudinally to form a film; wind the film after cooling, pulling, calibrating the thickness, and treating with corona or flame to form a large cylinder; subjecting the large cylinder to aging storage; and cut to length or cut again for the film product finally.

When the film is prepared via a biaxially oriented process - flat die process first orienting longitudinally and then transversely or bubble forming process, in the longitudinal orientation unit, the temperatures of the upper and lower cylinders through which the two film surfaces passes are controlled separately, and all 25 cylinder surfaces through which the functional layer passes are coated with polytetrafluoroethylene.

The biaxially oriented oriented polypropylene film suitable for glue-free lamination with paper having the above structure and the method of preparation thereof has the following advantages:

The biaxially oriented polypropylene film comprising a substrate layer and a functional surface layer. The substrate layer and functional surface layer composed of materials as described above are coextruded and oriented to form the film, the functional layer may be laminated directly with paper, preprinted paper or film including such layer, which thus performs glue-free lamination of paper and plastic, omits the glue step, simplifies the lamination method, and saves the energy source. Furthermore, the lamination method does not produce toxic volatile solvents, and is therefore environmentally friendly, safe and clean. In addition, the biaxially oriented polypropylene film prepared in said structure from said materials has high thermal sealing strength, and the product formed by laminating this film with paper, preprinted paper or another film including said functional layer. high peeling resistance, which is favorable for extended application of the product.

Description of the drawings

Figure 1 is a sectional block diagram of an example of the present invention.

Figure 2 is a sectional block diagram of another example of the present invention.

Figure 3 is a flow chart of a method for preparing the film of the present invention.

Mode for carrying out the present invention

With reference to the accompanying drawings, the present invention is described in further detail.

As shown in figs. 1 and 2, the biaxially oriented oriented polypropylene film suitable for glue-free lamination with paper in the present invention includes a surface layer 5, a core layer 3 and a surrounding functional layer 1, and the functional layer 1 may be directly laminated with paper, preprinted paper or film including such a layer. The film is obtained by coextruding by laminating surface layer 5, core layer 3 and functional layer 1, such that the most essential three-layer structure of the film of the present invention is constituted as shown in Figure I. In addition , to improve the properties of the film, a top subsurface layer 4 is located between surface layer 5 and core layer 3, and an underlying subsurface layer 2 is located between core layer and functional layer I. 5 formed by the above five layers is another example of the present invention as shown in Figure 2. Surface layer 5 comprises a mixture comprising polypropylene and an antiblocking agent or a mixture comprising polypropylene, high density polyethylene and an antioxidant being whereas the polypropylene comprised in surface layer 5 is a polypropylene is propylene copolymers (eg ethylene propylene copolymer, ethylene propylene butene terpolymer), the antiblocking agent is silicon dioxide 15 (SiO2), polymethyl methacrylate (PMMA), and etc. ., and the antioxidant is 1010, 1076, and etc. According to different preparation requirements, the underlying subsurface layer 2, core layer 3 and top subsurface layer 4 can be of the following three modes. First, core layer 3 comprises 60-100% isotactic polypropylene or a mixture formed by isotactic polypropylene, if less than 100%, and one or more selected hydrogenated petroleum resin, antistatic agent and agent. slip; the underlying subsurface layer 2 and top subsurface layer 4 comprise 60-100% isotactic polypropylene or a mixture formed by isotactic polypropylene, if less than 100%, and one or more selected 30 hydrogenated petroleum resin , antistatic agent and sliding agent. Second, one or more of the underlying subsurface layer 2, core layer 3 and top subsurface layer 4 comprise titanium dioxide. Third, one or more than the underlying subsurface layer 2, core layer 3 and top subsurface layer 4 comprise calcium carbonate and / or poly (butylene terephthalate). Functional layer 1 comprises ethylene butene copolymer, ethylene octene copolymer, ethylene butene octene terpolymer, maleic anhydride graft modified ethylene butene copolymer, maleic anhydride graft modified ethylene octene copolymer, terpolymer ethylene butene octene modified with maleic anhydride graft or mixtures thereof formed by any of the above modified copolymers or terpolymer, copolymers or terpolymer and mixtures with hydrogenated petroleum resin, the ethylene butene copolymer having a butene content 10-30%; the ethylene octene copolymer has an octene content of 5-20%; the ethylene butene octene terpolymer has a butene content of 1-30% and the octene content of 1-20%; and maleic anhydride graft modified ethylene butene copolymer, maleic anhydride graft modified ethylene octene copolymer, maleic anhydride modified ethylene butene octene terpolymer have a graft ratio of 0.5-2%. The antistatic agent may be glyceryl monostearate, di (β-

hydroxyethyl) octadecylamine; Slip agent may be erucamide, oleamide, ethylene bis (stearamide) (EBS); the hydrogenated petroleum resin may be a C-5 product or C-9 product, such as ARKON P-125 product manufactured at ARAKAWA Co., Japan, or an effective component (for convenience, is referred to herein as EM609) in PA609 hardening agent manufactured by EXXON-MOBIL Company.

The hydrogenated petroleum resin is 1-30% by weight of the functional layer 1.

Functional layer 1 represents 10-50% by weight of the film.

As shown in Figure 3, the flow diagram of a method for preparing the film of the present invention is as follows.

In Figure 3, A represents raw materials (including primary raw materials, modified materials and additive master batches), B represents castings; C represents molten sheet, D represents film; E represents product; F represents extruder extrusion procedure; G represents cooling procedure; M represents biaxial orientation procedure; 15 represents a corona or flame treatment procedure; K represents storage aging, cutting procedure in the length direction; J represents initial bubble.

Concrete steps include: premixing selected raw materials A (including primary raw materials, modified materials and additive master batches) into a projected formulation; mix to make the mixed materials uniform; measure mixed materials; send them into an extruder F extrusion procedure and plasticize them to be a homogeneous melt B; transfer the melt through one pass; filtering the melt through a filter; distribute the melt via flow block to a matrix; then fabricating the film by flat die process, i.e. cooling the extruded melt via cooling procedure G to form a melt sheet C, then biaxially orienting the melt sheet (first longitudinally and then transversely or longitudinally and transversely in sync) via the procedure biaxial orientation H to form a film D, or by bubble forming process, i.e. cooling the melt after leaving the die via cooling procedure G to form an initial bubble J, and then orienting biaxially (orienting longitudinally while blowing transversely) the initial bubble via biaxial orientation procedure H to form a film D; pulling the film after cooling, calibrating the thickness, and treating with corona or flame via treatment procedure I to form a large cylinder; subject the large cylinder to aging storage, and cut lengthwise or cut again via lengthwise cutting procedure K for film product E finally.

With respect to the extruder used in said method, the die temperature is 225 to 265 ° C, the cooling temperature is 15 to 40 ° C, the surface treatment level of the film after corona or flame treatment is 25 to 45 mN / m. In the flat die process, the two-step or synchronous orientation process can be selected according to the conditions of the apparatus for production. In the two-step orientation process, the temperature of the longitudinal orientation unit is from 50 to 150 ° C, the temperature of the transverse orientation unit is from 100 to 180 ° C, the longitudinal stretch ratio is from 4.5 to 150 ° C. 6.5, and the transverse stretch ratio is 7 to 10. In the synchronous orientation process 15, the longitudinal-transverse orientation unit temperature is 100 to 180 ° C, the IR preheat temperature is 300 to 600 ° C, the longitudinal stretch ratio is 4.5 to 6.5, and the transverse stretch ratio is 6 to 10. In the bubble forming process, the temperature of a pre-fired furnace heating the initial bubble is from 260 to 530 ° C, the temperature of a cross-blast furnace is from 300 to 640 ° C, the longitudinal orientation temperature is from 135 to 150 ° C, the longitudinal stretch ratio is 4, 5 to 25 8.0, and the stretch ratio The cross-sectional area is 5.0 to 8.0. When the film is prepared via a step-by-step flat matrix process biaxial orientation process or a bubble forming process biaxial orientation process, in the longitudinal orientation unit, the temperature of the upper and lower cylinders through which the films are formed. two surfaces of the film pass are controlled separately, and all cylinder surfaces through which the functional layer passes are coated with polytetrafluoroethylene.

Functional layer 1 represents 10-50% by weight of the film.

Guideline I: Standards, based on which the properties of the products are tested in the following examples are listed in the following table:

Physical Properties C nity Test Standard Thickness μιη ASTM D8 92 Density g / cm3 ASTM D7 92 Turbidity ASTM D1003 Whiteness O, ASTM E313 O Light Transmittance O. ASTM D1003 0 Brightness O. ASTM D2457 Ό Tensile Strength MPa ASTM D882 Elongation at Break O ASTM D882 O Wetting tension dyne / cm ASTM D2578 Thermal sealing resistance N / 15 mm ASTM F2029 Thermal shrinkage o. ASTM D1204 (120 ° C, 2 minutes) Ό Resistance to N / 15mm With reference to ASTM D903 peeling * (film / paper) * Note: in an environment of 23 ° C, 50% humidity, functional layer 1 of film is laminated with a strip of

5 gray ivory plate (manufactured by "Huafeng Paper Co., Ltd.") having a width of 15 mm and a unit weight of 300 g / m2 on its printable side under the conditions of 115 ° C, 0.30 MPa per 60 seconds; After cooling for 3 minutes, peeling resistance is tested according to ASTM D903.

Guideline 2: All percentages or percentages in the following example formulations are based on weight.

Guideline 3: In the following examples, melt index 15 (2.16 kg, 190 ° C) of the component in functional layer 1 is respectively: ethylene-butene copolymer: 4.5 g / 10 minutes; ethylene octene copolymer: 7 g / 10 minutes; ethylene butene octene terpolymer: 5 g / 10 minutes; maleic anhydride graft modified ethylene-butene copolymer: 3.5 g / 10 minutes; ethylene-octene copolymer modified with maleic anhydride grafting: 5.5 g / 10 minutes; ethylene-butene-octene terpolymer modified with anhydrous maleic: 4 g / 10 minutes.

Example 1

The functional layer consisted of: 70% ethylene butene copolymer; 30% maleic anhydride graft modified ethylene butene copolymer, with the ethylene butene copolymer having a 30% content, the maleic anhydride graft modified ethylene butene copolymer having a graft ratio of 0 , 5%.

Core layer 3 consisted of: 99.75% isotactic polypropylene (having an isotacticity of 97%, and a melt index of 3 g / 10 minutes), 2,500 ppm glyceryl monostearate.

Surface layer 5 consisted of: 99.2% of a mixture of high density polyethylene (having a melt index of 0.05 g / 10 minutes) and ethylene propylene copolymer (having a melt index of 7 g / 10 minutes) 20 formulated at a ratio of 9: 1, and 8,000 ppm of antioxidant 1010.

The prepared product was 20 μπι thick in total, functional layer 1 is 6 μπ \ thick, and functional layer 1 represented 30% by weight of the total film.

The preparation method comprised the following steps: premixing the selected A raw materials (including primary raw materials, modified materials and additive master batches) into a designed formulation, mixing to make the mixed materials uniform; measure mixed materials; send them to an extruder F extrusion procedure and plasticize them to be a homogeneous melt B; transfer the melt through one pass; filtering the melt through a filter; distributing the melt via the flow block to a matrix; cooling the extruded melt via cooling procedure G to form a molten sheet C, and then biaxially orienting the molten sheet via biaxial orientation procedure H to form a film D; controlling the thickness D of the film thickness using an automatic test; treating the film with corona or flame via treatment procedure I to improve its wetting tension; pulling and winding the treated film to form a large cylinder; subject the large cylinder to aging storage, and cut lengthwise via aging storage, cutting procedure K for film product E finally. The apparatus used in the preparation method was a biaxially oriented polypropylene film production line oriented by a flat die process, as manufactured by BRUECKNER Co., Germany, where the main extruder was a single spindle extruder with spindle diameter 15 mm. 150 mm and 33: 1 length / diameter ratio, the coextruder was a single spindle extruder with a 120 mm spindle diameter and 30: 1 length / diameter ratio. Temperatures in various sections of the extruder were 245 ° C, except for the feed section which was 100 ° C, temperatures in various filter zones were 250 ° C, and temperatures in various areas of the die were 235 ° C; cooling the extruded melt temperature was 23 ° C. For longitudinal orientation, all surfaces of the 25 cylinders through which the functional layer 1 passed were coated with polytetrafluoroethylene, the temperatures of the cylinders corresponding to the functional layer 1 were 60 ° C, the temperatures of the preparation zone cylinders corresponding to the non-functional layers. were 130 ° C, the 30 cylinder temperatures in each stretching zone were 10 ° C, the cylinder temperatures in the annealing zone were 135 ° C, and the stretching ratio was 4.0. For cross-sectional orientation, the temperatures in the preheating zones were 175 ° C, the temperatures in the 35 stretching zones were 160 ° C, the temperature in the annealing zones was 165 ° C, and the stretching ratio was 9. potency to treat with corona was 25 w.min / m2. The prepared product had the following properties:

(1) Thickness: 20 μπι,

(2) Density: 0.83 g / cm3,

(3) Tensile strength (longitudinal / transverse): 90 MPa / 130 MPa,

(4) Heat sealing resistance: 7.0 N / 15 mm,

(5) Peel resistance (film / paper): 3.5 N / 15 mm,

(6) Turbidity: 76.2%,

(7) Brightness: 8.5%,

(8) Thermal shrinkage (longitudinal / transverse): 3,5% / l, 5%,

(9) Wetting tension: 40 mN / m.

Example 2

Functional layer 1 consisted of: 50% ethylene butene copolymer, 20% ethylene butene copolymer modified with maleic anhydride graft, and 30% P-125, the ethylene butene copolymer having a content of of 10% butene, the maleic anhydride graft modified ethylene-butene 20 copolymer had a graft ratio of 2%.

Both the underlying subsurface layer 2 and top subsurface layer 4 consisted of: 99.8% isotactic polypropylene (having an isotacticity of 96%, and a melt index of 2.5 g / 10 minutes), 2,000 ppm monostearate of glyceryl.

Core layer 3 consisted of: 99.7% isotactic polypropylene (having an isotacticity of 96%, and a melt index of 2.5 g / 10 minutes), 2,000 ppm glyceryl monostearate, and 1,000 ppm ethylenebisestearamide .

Surface layer 5 consisted of: 99.8% isotactic polypropylene (having an isotacticity of 96%, and a melt index of 3 g / 10 minutes), 2,000 ppm silicon dioxide (SiO 2) ·

The prepared product was 18 μπι in total thickness, functional layer 1 was 5 μΓη in thickness, and functional layer 1 represented 27.8% by weight of the total film. The apparatus and parameters used in the preparation method were identical to those described in Example 1, except for the extruder parameters as follows.

The main extruder: single screw extruders in series;

Spindle diameter: 160 mm for melt extruder, 160 mm for the measurement extruder; ratio length / diameter of 20: 1 to melt extruder, 20: 1 for measuring the extruder.

The coextruder: single screw extruder;

Spindle diameter: 135 mm,

Length / diameter ratio: 30: 1.

The prepared product had the following properties:

(1) Thickness: 18 μιη,

(2) Density: 0,9 g / cm3,

(3) Tensile strength (longitudinal / transverse): 110 MPa / 200 MPa,

(4) Heat sealing resistance: 6.0 N / 15 mm,

(5) Peel resistance (film / paper): 3.2 N / 15 mm,

(6) Haze: 1.2%

(7) Thermal shrinkage (longitudinal / transverse): 2,0% / l, 2%,

(8) Wetting tension: 40 mN / m.

Example 3

Functional layer 1 consisted of: 80% ethylene octene copolymer, 10% ethylene butene copolymer modified with maleic anhydride graft, and 1% P-30 125, the ethylene octene copolymer having a In the octene content of 20%, the maleic anhydride graft modified ethylene butene copolymer had a graft ratio of 1%.

Both the underlying subsurface layer 2 and top subsurface layer 4 consisted of: 99.8% isotactic polypropylene (having a 95% isotacticity, and a melt index of 2 g / 10 minutes), 2,000 ppm glyceryl monostearate .

Core layer 3 consisted of: 99.75% isotactic polypropylene (having an isotacticity of 95%, and a melt index of 2 g / 10 minutes), 2,000 ppm glyceryl monostearate, and 500 ppm erucamide.

Surface layer 5 consisted of: 99.8% isotactic polypropylene (having an isotacticity of 96%, and a melt index of 3 g / 10 minutes), 2,000 ppm silicon dioxide (SiO 2).

The prepared product was 18 μπ \ thick in total, functional layer 1 was 5.4 μηα thick, and functional layer 1 represented 30% by weight of the total film.

The apparatus and parameters used in the preparation method were identical to those in Example 1 except for the following two aspects.

1. The parameters of the main extruder and coextrusora were respectively:

The main extruder: single spindle extruders in series;

Spindle diameter: 230 mm for melt extruder, 275 mm for the measurement extruder;

Length / diameter ratio: 20: 1 for melt extruder, 20: 1 for metering extruder.

The coextruder: single spindle extruder,

Spindle diameter: 135 mm;

length / diameter: 33: 1

2. The surfaces of the rollers by which the functional layer 1 were not coated passed politetrafluoroetiIeno.

0 prepared product had the following properties:

(1) Thickness: 18 μιη,

(2) Density: 0,9 g / cm3,

(3) Tensile strength (longitudinal / transverse): 100 MPa / 180 MPa,

(4) heat-sealing strength: 6.3 N / 15 mm

(5) Peel resistance (film / paper): 3.8 N / 15 mm, (6) Turbidity: 1.5%,

(7) Thermal shrinkage (longitudinal / transverse): 3,0% / l, 0%,

(8) Wetting tension: 40 mN / m.

Example 4

Functional layer 1 consisted of: 20% ethylene-butene copolymer, 45% ethylene-octene copolymer, 20% ethylene-octene copolymer modified with maleic anhydride graft, and 15% P-125. ethylene-butene copolymer 10 had a butene content of 25%, ethylene-octene copolymer had a 5% octene content, maleic anhydride graft modified ethylene-octene copolymer had a graft ratio of 0 , 5%. Both the underlying subsurface layer 2 and the top subsurface layer 4 consisted of: 100% isotactic polypropylene (having an isotacticity of 94%, and a melt index of 3.5 g / 10 minutes).

Core layer 3 consisted of: 80% isotactic polypropylene (having an isotacticity of 94%, and a melt index of 3.5 g / 10 minutes), 19.8% P-125, and 2,000 ppm monostearate. of glyceryl.

The surface layer consisted of 99.8% isotactic polypropylene (having a 96% isotacticity and a melt index of 3.5 g / 10 minutes), and 2,000 ppm polymethyl methacrylate (PMMA).

The prepared product was 18 μιη in total thickness, functional layer 1 was 7.2 μιη thick, and functional layer 1 represented 40% by weight of the total film.

The parameters used in the apparatus and method of preparation were identical to those described in Example 1 except for the extruder. The parameters of extrusion are as follows:

The main extruder: twin screw extruder; spindle diameter: 169 mm, 169 mm;

Length / diameter ratio: 32: 1, 32: 1.

The coextruder: single screw extruder; Spindle diameter: 150 mm; length / diameter: 33: 1

The prepared product had the following properties:

(1) Thickness: 18 μιη,

(2) Density: 0.91 g / cm3,

(3) Tensile strength (longitudinal / transverse): 105 MPa / 180 MPa,

(4) heat-sealing strength: 6.0 N / 15 mm

(5) Peel resistance (film / paper): 4.5 N / 15 mm,

(6) Turbidity: 1.2%,

(7) Thermal shrinkage (longitudinal / transverse): 3,0% / l, 2%,

(8) Wetting tension: 40 mN / m.

Example 5

The functional layer consisted of: 60% ethylene octene copolymer, 20% ethylene butene octene terpolymer, 10% ethylene octene copolymer modified with maleic anhydride graft, and 10% P-125. whereas the ethylene octene copolymer had a 10% octene content, the ethylene butene octene terpolymer had a 1% butene content and a 20% octene content, the ethylene octene copolymer modified with maleic anhydride graft had a graft ratio of 1.2%.

Both the underlying subsurface layer 2 and the top subsurface layer 4 consisted of: 100% isotactic polypropylene (having an isotacticity of 96.5%, and a melt index of 2.8 g / 10 minutes).

Core layer 3 consisted of: 100% isotactic polypropylene (having an isotacticity of 96.5%, and a melt index of 2.8 g / 10 minutes).

Surface layer 5 consisted of: 99.8% isotactic polypropylene (having an isotacticity of 96%, and a melt index of 3 g / 10 minutes), and 2,000 ppm polymethyl methacrylate (PMMA).

The prepared product was 40 μπ \ thick in total, functional layer 1 was 20 μιη thick, and functional layer 1 represented 50% by weight of the total film. The parameters used in the apparatus and method of preparation was identical to that described in Example 1, except for the following two aspects:

1. The biaxially oriented flat die process polypropylene film production line was

produced by Mitsubishi Heavy Industries (MHI) Co. Japan. The main extruder and coextruder parameters were respectively:

The main extruder were series single screw extruders having the following screw parameters:

cast extruder: 115 mm in diameter, and length / diameter ratio 20: 1;

measuring extruder: 115 mm in diameter, length / diameter ratio 20: 1;

The coextruder was a single screw extruder with a spindle diameter of 120 mm and a length / diameter ratio of 30: 1.

2. The surfaces of the cylinders through which functional layer 1 passed were not coated with

polytetrafluoroethylene.

The prepared product had the following properties:

(1) Thickness: 40 μιη,

(2) Density: 0,9 g / cm3,

(3) Tensile strength (longitudinal / transverse): 90 MPa / 150 MPa,

(4) Heat sealing resistance: 12.0 N / 15 mm,

(5) Peel resistance (film / paper): 5.8 N / 15 mm,

(6) Turbidity: 3,5%,

(7) Thermal shrinkage (longitudinal / transverse): 3,8% / 1,4%,

(8) Wetting tension: 40 mN / m.

Example 6

The functional layer consisted of: 20% ethylene-butene copolymer, 20% ethylene-octene copolymer, 40% ethylene-octene copolymer modified with maleic anhydride graft, and 20% of EM609. ethylene butene had a butene content of 20%, the ethylene octene copolymer had an octene content of 15%, the maleic anhydride graft modified ethylene octene copolymer had a graft ratio of 5%.

Both the underlying subsurface layer 2 and the top subsurface layer 4 consisted of: 99.85% isotactic polypropylene (having an isotacticity of 97.5%, and a melt index of 3.2 g / 10 minutes). ppm di (β-hydroxyethyl) octadecylamine, and 1,000 ppm oleamide.

Core layer 3 consisted of 99.85% isotactic polypropylene (having an isotacticity of 97.5%, and a melt index of 3.2 g / 10 minutes), 500 ppm glycidyl monostearate, and 1,000 ppm of Oleamide.

Surface layer 5 consisted of: 99.8% isotactic polypropylene (having an isotacticity of 97.5%, and a melt index of 3.2 g / 10 minutes), 2,000 ppm silicon dioxide (SiO2) ·

The prepared product was 18 μτη thick in total, functional layer 1 was 5 μπι thick, and functional layer 1 represented 27.8% by weight of the total film. The preparation method comprised the following steps: premixing the selected raw materials (including 25 primary raw materials, modified materials and additive master batches) into a projected formulation; mix to make the mixed materials uniform; measure mixed materials; send them to an extruder F extrusion procedure and plasticize them to be a homogeneous melt B; transfer the melt through one pass; filtering the melt through a filter; distributing the melt via a flow block to a matrix; cooling the extruded melt via cooling procedure G to form a molten sheet C, and then biaxially orienting the molten sheet via the biaxial orientation procedure H to form a film D; control film thickness D using an automatic thickness tester; treat the film with corona or flame to improve its moistening tension; pulling and winding the treated film to form a large cylinder; subject the large cylinder to aging storage, and cut it lengthwise via aging storage, cutting procedure K for film product E finally. The apparatus used in the method was a biaxially synchronously oriented 10 polypropylene film production line, as manufactured by BRUECKNER Co., Germany, the main extruder being a twin screw extruder with a 169 mm spindle diameter and length ratio. / diameter 32: 1, the coextruder was a single spindle extruder with a spindle diameter of 15 135 mm and a length / diameter ratio of 33: 1. Temperatures in the various sections of the extruder were 245 ° C, except for the feed section which was 200 ° C, temperatures in the various filter zones were 250 ° C, and temperatures in the various die zones were 235 ° C; The cooling temperature for the extruded melt was 25 ° C. IR preheating temperatures in various zones were 500 ° C, longitudinal-transverse orientation temperature was 157 ° C, longitudinal stretch ratio was 5, and transverse stretch ratio was 7. Power for treatment with corona was 30 w.min / m2.

(1) Thickness: 18 μπ \,

(2) Density: 0,9 g / cm3,

(3) Tensile strength (longitudinal / transverse): 95 MPa / 170 MPa,

(4) Heat sealing resistance: 6.0 N / 15 mm,

(5) Peel resistance (film / paper): 4.3 N / 15 mm,

(6) Turbidity: 1.8%,

(7) Thermal shrinkage (longitudinal / transverse): 2,5% / l, 0%,

(8) Wetting tension: 41 mN / m. The biaxially oriented polypropylene films prepared according to the structures, materials and preparation methods described in Examples 1-6 had simple structures, and high heat sealing strength. The products formed by laminating these films with paper, preprinted paper or another film including said functional layer 1 had high peel strength, which was favorable for extended application of the products.

Example 7

Functional layer 1 consisted of 60% ethylene-butene-octene terpolymer, 15% of ethylene-butene-octene terpolymer modified with maleic anhydride graft, and 25% of EM609. If the octene had a butene content of 30% and an octene content of 1%, the maleic anhydride graft modified ethylene butene octene terpolymer had a graft ratio of 0.5%.

Both the underlying subsurface layer 2 and the top subsurface layer 4 consisted of: 70% isotactic polypropylene (having an isotacticity of 95.5%, and a melt index of 2.8 g / 10 minutes), 14% of EM609, 14% calcium carbonate, and 2% titanium dioxide.

Core layer 3 consisted of: 70% istotactic polypropylene (having an isotacticity of 95.5%, and a melt index of 2.8 g / 10 minutes), 12% EM609, 14% calcium carbonate, and 4% titanium dioxide.

Surface layer 5 consisted of: 99.8% isotactic polypropylene (having an isotacticity of 96%, and a melt index of 3 g / 10 minutes), 2,000 ppm silicon dioxide (SiO 2) ·

The prepared product was 47 μπ \ thick in total, functional layer 1 was 7 μιη thick, and functional layer 1 represented 21.5% by weight of the total film.

The preparation method comprised the following steps: premixing the selected raw materials A (including primary raw materials, modified materials and additive master batches) into a projected formulation; mix to make the mixed materials uniform; measure mixed materials; send them to an extruder extrusion procedure F and plasticize them to be homogeneous cast B; transfer the melt through one pass; filtering the melt through a filter; distribute the melt via flow block to a matrix; cooling the extruded melt via cooling procedure G to form a molten sheet C, and then biaxially orienting the molten sheet via biaxial orientation procedure H to form a film D; control film thickness D using an automatic thickness tester; treat the film with corona or flame to improve its moistening tension; pulling and reeling the treated film to form a large cylinder; subject the large cylinder to aging storage, and cut lengthwise via aging storage, cutting procedure K for film product E finally. The apparatus used in the preparation method was a flat die process biaxially oriented polypropylene film production line as manufactured by BRUECKNER Co., Germany, with the main extruder being a 150 mm diameter single spindle extruder. mm and length / diameter ratio of 33: 1, the coextruder was a single spindle extruder with a spindle diameter of 120 mm and a length / diameter ratio of 30: 1. Temperatures in the various extruder sections were 235 ° C, except for the feed section which was 100 ° C, temperatures in the various filter zones were 245 ° C, and temperatures in the various die zones were 230 ° C; The cooling temperature for the extruded melt was 25 ° C. For longitudinal orientation, all cylinder surfaces through which the functional layer

1 passed were coated with polytetrafluoroethylene, the temperatures of the cylinders corresponding to the functional layer 1 were 90 ° C, the temperatures of the preheating zone cylinders corresponding to the non-functional layers were 130 ° C, the temperatures in each stretching zone were 115 ° C. ° C, the cylinder temperature in the annealing zone was 135 ° C, and the stretch ratio was 5.6. For cross-sectional orientation, the temperatures in the preheating zones were 175 ° C, the temperatures in the stretching zones were 160 ° C, the cylinder temperature in the annealing zones in the various annealing zones was 165 ° C, and the stretch ratio was 9. The potency for corona treatment was 30 w.min / m2.

The prepared product had the following properties:

(1) Thickness: 47 μιη,

(2) Density: 0,65 g / cm3,

(3) Tensile strength (longitudinal / transverse): 90 MPa / 160 MPa,

(4) Heat sealing resistance: 9.0 N / 15 mm,

(5) Peel resistance (film / paper): 5.1 N / 15 mm,

(6) Light transmittance: 20%,

(7) Whiteness: 90%,

(8) Thermal shrinkage (longitudinal / transverse): 3.5% / 1.5%

(9) Wetting tension: 41 mN / m.

2 5 Example 8

Functional layer 1 consisted of: 80% ethylene butene octene terpolymer and 20% maleic anhydride graft modified ethylene butene octene terpolymer, the ethylene butene octene terpolymer having a content of 30%. butene content of 15% and a 10% octene content, the maleic anhydride graft modified ethylene-butene octene terpolymer had a graft ratio of

1 S-

Both the underlying subsurface layer 2 and top subsurface layer 4 consisted of: 92% isotactic polypropylene (having an isotacticity of 94.5%, and a melt index of 2.2 g / 10 minutes), 4% of poly (butylene terephthalate), and 4% titanium dioxide.

Core layer 3 consisted of: 60% isotactic polypropylene (having an isotacticity of 94.5%, and a melt index of 2.2 g / 10 minutes), 20% EM609, 12% calcium carbonate, and 8% poly (butylene terephthalate).

Surface layer 5 consisted of: 99.1% of a high density polyethylene mixture (having a melt index 10 of 0.05 g / 10 minutes) and an ethylene propylene butene terpolymer (having an index of (10 g melt) formulated at a ratio of 9:11, 6,000 ppm antioxidant 1010, and 3,000 ppm antioxidant 1076.

The prepared product was 60 µm thick in total, functional layer 1 was 5.3 µm thick, and functional layer 1 represented 10% by weight of the total film.

The preparation method comprised the following steps: premixing the selected raw materials A (including primary raw materials, modified materials and additive master batches) into a desired formulation; mix to make the mixed materials uniform; measure mixed materials; send them to an extruder extrusion procedure F and plasticize them to be homogeneous cast B; transfer the melt through one pass; filtering the melt through a filter; distribute the melt via flow block to a matrix; cooling the extruded melt via cooling procedure G to form a molten sheet C, and then biaxially orienting the molten sheet via biaxial orientation procedure H to form a film D; control film thickness D using an automatic thickness tester; treat the film with corona or flame to improve its moistening tension; pulling and winding the treated film to form a large cylinder; to submit

the large cylinder is aging storage, and cut lengthwise via aging storage, cutting procedure K for film product E finally. The apparatus used in the preparation method was a flat die process biaxially oriented polypropylene film production line as manufactured by BRUECKNER Co., Germany, the main extruder being a single spindle diameter extruder with 150 mm and 33: 1 length / diameter ratio, the coextruder was a single spindle extruder with a spindle diameter of 120 mm 10 and a length / diameter ratio of 30: 1. Temperatures in various sections of the extruder were 245 ° C, except for the feed section which was 180 ° C, temperatures in the various filter zones were 250 ° C, and temperatures in the various die zones were 235 ° C; at 15 ° C cooling temperature for the extruded melt was 23 ° C. For longitudinal orientation, all cylinder surfaces through which the functional layer

1 pass were coated with polytetrafluoroethylene, the temperatures of the cylinders corresponding to the functional layer 1 were 90 ° C, the temperatures of the preheating zone cylinders corresponding to the non-functional layers were 135 ° C, the temperatures of the cylinders in each stretch zone were 110 ° C, the cylinder temperature in the annealing zone was 140 ° C, and the stretch ratio was 5.5. For cross-sectional orientation, preheating temperatures in various zones were 176 ° C, temperatures in the stretching zones were 162 ° C, the temperature in the annealing zones were 168 ° C, and the stretching ratio was 9. The potency for corona treatment was 28 w.min / m2.

The prepared product had the following properties:

(1) Thickness: 60 μιη,

(2) Density: 0.62 g / cm3,

(3) Tensile strength (longitudinal / transverse): 95 MPa / 160 MPa,

(4) Heat sealing resistance: 5.5 N / 15 mm,

(5) Peel resistance (film / paper): 4.1 N / 15 mm,

(6) Light transmittance: 17%,

(7) Whiteness: 90%,

(8) Thermal shrinkage (longitudinal / transverse): 2.8% / 1.3%

(9) Wetting tension: 41 mN / m.

The biaxially oriented polypropylene films prepared according to the structures, materials and preparation methods described in Examples 7-8 had high heat seal strength. Products formed by laminating these films with paper such as Kraft paper can be used for seed packaging, animal feed, plastic particles. The products formed by laminating these films with another film 15 including said functional layer 1 had high whiteness, good opacity and high peel strength, and can be used as synthetic paper, and find wide application in labels, handbags, substrates for packaging printing.

2 0 Example 9

Functional layer 1 consisted of: 70% ethylene butene copolymer, 30% maleic anhydride graft modified ethylene butene copolymer, the ethylene butene copolymer having a butene content of 25 27.5% , the maleic anhydride graft-modified ethylene-butene copolymer had a graft ratio of 0.8%.

Core layer 3 consisted of: 99.75% isotactic polypropylene (having an isotacticity of 96.5%, and a melt index of 3.5 g / 10 minutes), 2,500 ppm di (β-hydroxyethyl) octadecylamine .

Surface layer 5 consisted of: 99.2% of a mixture of high density polyethylene (having a melt index of 0.05 g / 10 minutes) and ethylene-propylene copolymer (having a melt index of 7 g / 10 minutes) formulated at a rate of 9:11, and 8,000 ppm antioxidant 1010. The prepared product was 20 μιη in total, functional layer 1 was 6 μιη thick, and functional layer 1 represented 30%. by weight of the total film.

The preparation method comprised the following steps: premixing the selected raw materials A (including primary raw materials, modified materials and additive master batches) into a projected formulation; mix to make the mixed materials uniform; measure mixed materials; send them to an extruder extrusion procedure F and plasticize them to be homogeneous cast B; transfer the melt through one pass; filtering the melt through a filter; distributing the melt via a flow block to a matrix; cooling the extruded melt after leaving the die via cooling procedure G to form an initial bubble J, and then orienting biaxially (orienting longitudinally while blowing transversely) the initial bubble via biaxial orientation procedure H to form a film D; wind the film after cooling, pull and calibrate the thickness, and treat with corona or flame via treatment procedure I to form a large cylinder; cut lengthwise, rewind, and cut the large cylinder again via procedure K for film product E finally.

The apparatus used in the preparation method was a biaxially oriented bubble forming polypropylene film production line as manufactured by REIFENHAUSER Co., Germany, with the main extruder being a single screw extruder with screw diameter. 150 mm and 33: 1 length / diameter ratio, the coextruder was a single spindle extruder with a 120 mm spindle diameter and 30: 1 length / diameter ratio. Temperatures 35 in the various sections of the extruder were 245 ° C, except for the feed section which was 180 ° C, temperatures in the various filter zones were 250 ° C, and temperatures in the various die zones were 245 ° C; the air ring cooling temperature was 18 ° C; the temperature of an oven to preheat the initial bubble was 350 ° C; the temperature of a cross-blast furnace was 5,420 ° C; all cylinder surfaces through which functional layer 1 passed were coated with polytetrafluoroethylene, the temperatures of the cylinders corresponding to functional layer 1 were 80 ° C, the temperatures of cylinders corresponding to non-functional layers 10 were 135 ° C; the longitudinal stretch ratio was 5, and the transverse stretch ratio was 8.0; the potency for corona treatment was 25 w. min / m2.

The prepared product had the following properties:

(1) Thickness: 20 μπι,

(2) Density: 0.83 g / cm3,

(3) Tensile strength (longitudinal / transverse): 90 MPa / 180 MPa,

(4) Heat sealing resistance: 7.6 N / 15 mm,

(5) Peel resistance (film / paper): 4.0 N / 15 mm,

(6) Turbidity: 75.5%,

(7) Brightness: 8.0%,

(8) Thermal shrinkage (longitudinal / transverse): 3.4% / l, 9%

(9) Wetting tension: 40 mN / m.

Example 10

Functional layer 1 consisted of: 52.5% ethylene butene copolymer, 20% ethylene butene copolymer modified with maleic anhydride graft, and 27.5% EM609, the ethylene butene copolymer being had a butene content of 12.5%, the maleic anhydride-modified ethylene-butene copolymer had a graft ratio of 1.5%.

Both the underlying subsurface layer 2 and the top subsurface layer 4 consisted of: 99.5% isotactic polypropylene (having an isotacticity of 95.5%, and a melt index of 3.5 g / 10 minutes), 1,000 ppm di (β-hydroxyethyl) octadecylamine, and 1,000 ppm oleamide.

Core layer 3 consisted of: 99.7% isotactic polypropylene (having an isotacticity of 95.5%, and a melt index of 3.5 g / 10 minutes), 2,000 ppm glyceryl monostearate and 1,000 ppm Oleamide.

Surface layer 5 consisted of: 99.8% isotactic polypropylene (having an isotacticity of 95.5%, and a melt index of 3.5 g / 10 minutes), 2,000 ppm silicon dioxide (SiO 2) -

The prepared product was 18 μιη in total thickness, functional layer 1 was 5 μιη thick, and functional layer 1 represented 27.8% by weight of the total film. The apparatus and parameters used in the preparation method were identical to those described in Example 9, except for the main extruder and longitudinal stretch ratio.

The main extruder used in this Example: series extruders;

spindle diameter: 160 mm for cast extruder, 160 mm for metering extruder;

Length / diameter ratio: 20: 1 for cast extruder, 20: 1 for metering extruder.

The longitudinal stretch ratio was 4.9.

The prepared product had the following properties:

(1) Thickness: 18 μιη,

(2) Density: 0,9 g / cm3,

(3) Tensile strength (longitudinal / transverse): 110 MPa / 170 MPa,

(4) Heat sealing resistance: 6.0 N / 15 mm,

(5) Peel resistance (film / paper): 3.2 N / 15 mm,

(6) Haze: 1.2%

(7) Thermal shrinkage (longitudinal / transverse): 2.0% / l, 2%

(8) Wetting tension: 40 mN / m. The biaxially oriented polypropylene films prepared according to the structures, materials and preparation methods described in Examples 9-10 had simple structures, and high heat sealing strength. The products formed by laminating these films with paper, preprinted paper or another film including said functional layer 1 had high peeling resistance, which was favorable for extended application of the products.

Example 11

Functional layer 1 consisted of 80% ethylene butene octene terpolymer and 20% maleic anhydride graft modified ethylene butene octene terpolymer, the ethylene butene octene terpolymer having a 15% content. 10% butene and a 15% octene content, the maleic anhydride graft modified ethylene-butene octene terpolymer had a graft ratio of 0.8%.

Both the underlying subsurface layer 2 and the top 20 subsurface layer 4 consisted of: 94% isotactic polypropylene (having an isotacticity of 96%, and a melt index of 3 g / 10 minutes), 4% poly (terephthalate) butylene), and 2% titanium dioxide.

Core layer 3 consisted of 90% isotactic polypropylene (having a 96% isotacticity and a melt index of 3 g / 10 minutes), 6% poly (butylene terephthalate), and 4% titanium dioxide .

Surface layer 5 consisted of: 99.8% isotactic polypropylene (having an isotacticity of 96%, and a melt index of 3 g / 10 minutes), and 2,000 ppm silicon dioxide (SiO 2) -

The prepared product was 60 µm thick, functional layer 1 was 5.3 µm thick, and functional layer 1 represented 10% by weight of the total film.

The preparation method comprised the following steps: premixing the selected raw materials A (including primary raw materials, modified materials and additive master batches) into a projected formulation; mix to make the mixed materials uniform; measure mixed materials; send them to an extruder extrusion procedure F and plasticize them to be homogeneous cast B; transfer the melt through one pass; filtering the melt through a filter; distribute the melt via flow block to a matrix; cooling the extruded melt after leaving the die via cooling procedure G to form an initial bubble J, and then orienting biaxially (orienting longitudinally while blowing transversely) the initial bubble via biaxial orientation procedure H to form a film D; wind the film after cooling, pull and calibrate the thickness, and treat with corona or flame via treatment procedure I to form a large cylinder; cut lengthwise; rewind, and cut the large cylinder again via procedure K for film product E finally.

The apparatus used in the preparation method was a biaxially oriented bubble forming polypropylene film production line, as manufactured by REIFENHAUSER Co., Germany, where the main extruder was a single screw extruder with a screw spindle diameter. 150 mm and a length / diameter ratio of 33: 1, the coextruder was a single spindle extruder with a spindle diameter of 120 mm and a length / diameter ratio of 30: 1. The extruder temperature was 240 ° C, the filter temperature was 250 ° C, and the die temperature was 240 ° C; the cooling temperature was 17 ° C; the temperature of an oven to preheat the initial bubble was 350 ° C; the temperature of a transversely blowing furnace was 420 ° C; all 35 cylinder surfaces through which functional layer 1 passed were coated with polytetrafluoroethylene, cylinder temperatures corresponding to functional layer 1 were 80 ° C, cylinder temperatures corresponding to non-functional layers were 135 ° C; the longitudinal stretch ratio was 5.6, and the transverse stretch ratio was 8.0; the potency for corona treatment was 29 w.min / m2.

The prepared product had the following properties:

(1) Thickness: 60 μιτι,

(2) Density: 0.62 g / cm3,

(3) Tensile strength (longitudinal / transverse): 88 MPa / 17 0 MPa,

(4) Heat sealing resistance: 5.5 N / 15 mm,

(5) Peel resistance (film / paper): 4.1 N / 15 mm,

(6) Light transmittance: 17%,

(7) Whiteness: 90%,

(8) Thermal shrinkage (longitudinal / transverse): 2.8% / l, 3%

(9) Wetting tension: 41 mN / m.

Example 12

Functional layer 1 consisted of: 70% ethylene-butene-octene terpolymer, 10% of ethylene-butene-octene terpolymer modified with maleic anhydride graft, and 20% of P-125, the ethylene-butene octene terpolymer being butene octene had a butene content of 20% and a 25 octene content of 5%, the maleic anhydride graft modified ethylene butene octene terpolymer had a graft ratio of 2%.

Both the underlying subsurface layer 2 and the top subsurface layer 4 consisted of: 90% isotactic polypropylene (having an isotacticity of 96%, and a melt index of 3 g / 10 minutes), and 10% calcium carbonate. .

Core layer 3 consisted of: 70% isotactic polypropylene (having an isotacticity of 96%, and a melt index of 3 g / 10 minutes), 14% P-125, 10% calcium carbonate, and 6 % titanium dioxide.

Surface layer 5 consisted of: 99.8% isotactic polypropylene (having an isotacticity of 96%, and a melt index of 3 g / 10 minutes), and 2,000 ppm silicon dioxide (SiO 2) -

The prepared product was 47 μιη in total thickness, 5 functional layer 1 was 7 μιη thick, and functional layer 1 represented 21.5% by weight of the total film. The apparatus and parameters used in the preparation method were identical to those described in Example 11, except that the surfaces of the cylinders through which functional layer 1 passed were not coated with polytetrafluoroethylene, and the temperatures of the cylinders corresponding to functional layer 1 were 60 °. Ç.

The prepared product had the following properties:

(1) Thickness: 47 μιη,

(2) Density: 0.67 g / cm3,

(3) Tensile strength (longitudinal / transverse): 85 MPa / 150 MPa,

(4) Heat sealing resistance: 9.0 N / 15 mm,

(5) Peel resistance (film / paper): 4.9 N / 15 mm,

(6) Light transmittance: 21%,

(7) Whiteness: 90%,

(8) Thermal shrinkage (longitudinal / transverse): 2.4% / 0.5%

(9) Wetting tension: 41 mN / m.

The biaxially oriented polypropylene films prepared according to the structures, materials and preparation methods described in Examples 11-12 had high heat seal strength. Products formed by laminating these films with paper such as Kraft paper may be used for packaging seeds, animal feed, plastic particles. The products formed by laminating these films with another film including said functional layer 1 had high whiteness, good opacity and high peel strength, and can be used with synthetic paper, and find wide applications in labels, handbags, substrates for print packaging.

Claims (10)

1. A biaxially oriented oriented polypropylene film suitable for gluing without paper, characterized in that it comprises a surface layer (5), a core layer (3) and a functional layer (1) located around and co-extruded, wherein the functional layer (1) may be laminated directly with paper, preprinted paper or film including such layer via hot pressing, which is identified by the fact that the functional layer (1) comprises ethylene butene copolymer, ethylene octene, ethylene butene octene terpolymer, maleic anhydride graft modified ethylene butene copolymer, maleic anhydride graft modified ethylene octene copolymer, maleic anhydride graft modified ethylene butene octene terpolymer or mixtures thereof, or mixtures formed of any of the copolymers or terpolymer, modified copolymers or above terpolymer and hydrogenated petroleum resin mixtures; and which is identified by: (i) the ethylene butene copolymer having a butene content of 10-30%, the ethylene octene copolymer having an octenity content of 5-20%, the ethylene butene terpolymer octenate has a butene content of 1-30% and an octenate content of 1-20%; (ii) the maleic anhydride graft modified ethylene butene copolymer, maleic anhydride graft modified ethylene octene copolymer, maleic anhydride graft modified ethylene butene octene terpolymer have a graft ratio of 0.5 -2%; (iii) the functional layer represents 10-50% by weight of the film; and (iv) The functional layer is treated as a corona or flame. Film according to Claim 1, characterized in that a top subsurface layer (4) is located between the surface layer (5) and the core layer (3) and an underlying subsurface layer (2). ) be located between the core layer (3) and the functional layer (1). Film according to either claim 1 or claim 2, characterized in that the surface layer (5) comprises a mixture comprising polypropylene and an antiblocking agent or a mixture comprising polypropylene, high density polyethylene and an antioxidant. Film according to either claim 1 or claim 2, characterized in that the core layer (3) comprises 60-100% isotactic polypropylene or a mixture formed of isotactic polypropylene if it has a quantity of less than 100%, and one or more selected hydrogenated petroleum resin, antistatic agent and gliding agent. Film according to either of Claims 1 and 2, characterized in that the underlying subsurface layer (2) and the top subsurface layer (4) comprise 60-100% isotactic polypropylene or a mixture formed by isotactic polypropylene. if they have less than 100% and one or more selected from hydrogenated petroleum resin, antistatic agent and sliding agent. Film according to claim 2, characterized in that one or more of the underlying subsurface layer (2), the core layer (3) and the top subsurface layer (4) comprise titanium dioxide. Film according to claim 2, characterized in that one or more of the underlying subsurface layer (2), the core layer (3) and the top subsurface layer (4) comprise calcium carbonate and / or poly (butylene terephthalate). Film according to Claim 1, characterized in that the hydrogenated petroleum resin represents 1-30% by weight of the functional layer (1). Method for preparing a oriented oriented polypropylene film suitable for glue-free lamination with paper, comprising the steps of: premixing the selected primary raw materials, modified materials and additive master batches into a projected formulation; mix to make the mixed materials uniform; measure mixed materials; send them to an extruder and plasticize them to be homogeneous cast; transfer the melt through one pass; filtering the melt through a filter; distributing the melt via a flow block to a matrix; then producing the film by flat die process, i.e. cooling the extruded melt to form a molten sheet, and then biaxially orienting the molten sheet first longitudinally and then transversely or longitudinally and transversely in sync to form a film, or by bubble forming process, i.e. cooling the melt after leaving the matrix to form an initial bubble, and then blowing transversely and longitudinally orienting the initial bubble to form a film; wind the film after cooling, pull, calibrate the thickness, and treat with corona or flame to form a large cylinder; subject the large cylinder to aging storage; and cut lengthwise or cut it again for film product finally. Method according to claim 9, characterized in that when the film is prepared via a biaxial orientation process - flat matrix process firstly longitudinally and then transversely orienting or bubble forming process in the biaxial orientation unit, the temperature of the upper and lower cylinders through which the two film surfaces pass are controlled separately, and all cylinder surfaces through which the functional layer (1) passes are coated with polytetrafluoroethylene.