WO2008092328A1

WO2008092328A1 - A biaxially orientated polypropylene film for combining paper and plastic without adhesive and a preparation method thereof

Info

Publication number: WO2008092328A1
Application number: PCT/CN2007/003459
Authority: WO
Inventors: Wenshu Xu; Jianmin Zhu; Xiaoming Zhou; Qiyang Luo
Original assignee: Guangdong Decro Package Films Co., Ltd.
Priority date: 2007-01-26
Filing date: 2007-12-11
Publication date: 2008-08-07
Also published as: BRPI0720817A2; TR200905559T1; RU2426651C2; KR20090109565A; RU2009132095A; KR100988873B1

Abstract

Disclosed herein are a biaxially orientated polypropylene film for paper-plastic composite without adhesive and a preparation method thereof. The film includes a surface layer (5), a core layer (3) and a functional layer (1) in turn and the film is obtained by co-extruding. The functional layer (1) can combine directly with paper, preprinted paper or film including the layer. It is arranged a top subsurface layer (4) between the surface layer (5) and the core layer (3). It is arranged a subjacent subsurface layer (2) between the core layer (3) and the functional layer (1). The preparation method of the film comprises the following steps: transferring the chosen raw material into an extruder and plasticizing them to melt; transferring the melt through a passage; filtrating the melt by a filter; distributing the melt to a die head; then manufacturing the film by flat-film extrusion or pipe soaking method respectively; treating the film with corona or flame to mother-roll; aging the mother-roll; and cutting it to film product finally.

Description

Biaxially oriented polypropylene film for paper-plastic glue-free composite and preparation method thereof

The invention relates to a biaxially oriented polypropylene film for paper-plastic non-adhesive composite and a preparation method thereof. Background technique

At present, there are mainly the following methods applied to paper-plastic composite industry in the industry: One is the glue method (dry compounding and wet method compounding), but this method will pollute the environment with a large amount of toxic solvents in the atmosphere; The second is the solventless composite method. The initial adhesion of the composite product obtained by the method is extremely low; the third is the precoating method, but although this method can be used without a solvent, the process is more and the cost is increased. In addition, the time-dependent dependence of the peeling strength of the adhesive layer of the composite product obtained by the above method is obvious. Therefore, in order to overcome the shortcomings of the paper-plastic composite in the prior art, Chinese Patent No. ZL03226653. 7 discloses a paper-plastic composite structure, which comprises a paper layer and a hot press composite on the paper layer. The plastic film layer can be directly laminated on the surface of the paper layer by a biaxially stretched polypropylene non-adhesive composite film. However, although the patent discloses a paper-plastic glue-free composite structure, the specific composition of the film layer and the preparation method thereof are not disclosed. In actual use, it is difficult for an accurate production reproduction, in paper plastic. In the promotion and application of the composite technology field, it has certain difficulty. SUMMARY OF THE INVENTION The object of the present invention is to overcome the deficiencies of the prior art, and to provide a paper-plastic glueless composite, a simplified composite process, energy conservation, environmental protection and hygiene, and good product performance. Propylene film and preparation method thereof.

The object of the present invention is achieved as follows: A biaxially oriented polypropylene film for paper-plastic-free composite, characterized in that it comprises a surface layer, a core layer and a direct bond with a co-extruded composite. A functional layer of paper, preprinted paper or another film composite containing this layer.

The last surface layer is disposed between the surface layer and the core layer, and the next surface layer is disposed between the core layer and the functional layer.

The skin layer is a blend comprising polypropylene and an antiblocking agent or a blend comprising polypropylene, high density polyethylene, and an antioxidant. Confirmation The core layer contains 60 to 100% of isotactic polypropylene or a mixture of isotactic polypropylene and hydrogenated petroleum resin, antistatic agent, and slip agent of less than 100% of the above content. , the next surface layer and the last surface layer contain 60 ~ 100% isotactic polypropylene or less than 100% of the above content of isotactic polypropylene and hydrogenated stone resin, antistatic agent, slip agent or one of several a mixture of components.

One or more of the next skin layer, the core layer, and the last skin layer contain titanium dioxide.

One or more of the next skin layer, core layer and last skin layer comprise calcium carbonate and/or polybutylene terephthalate.

The functional layer is an ethylene-butene copolymer, an ethylene-octene copolymer, an ethylene-butylene-octene copolymer, a maleic anhydride graft modification of an ethylene-butene copolymer, and an ethylene-octene a maleic anhydride graft modification of a polymer, a maleic anhydride graft modification of an ethylene-butylene-octene copolymer or a blend thereof, or a copolymer, a modification, or a blend thereof a re-blend of any component with a hydrogenated petroleum resin, the butene content of the ethylene-butene copolymer is 10 to 30%, and the octene content of the ethylene-octene copolymer is 5 - 20%, ethylene. - Butene-octene copolymer having a butene content of 1 to 30% and an octene content of 1 to 20%, a maleic anhydride graft modified product of an ethylene-butene copolymer, and an ethylene-octene copolymer 5 - 2%。 The maleic anhydride graft modified and the ethylene-butyl;

The hydrogenated petroleum resin accounts for 1 to 30% by weight of the functional layer.

The functional layer accounts for 10 to 50% by weight of the film.

The preparation method of the biaxially oriented polypropylene film for paper-plastic glue-free composite of the invention is as follows:

The selected main raw materials, modified materials and additive masterbatch are pre-mixed according to the design formula, and evenly stirred. After the resin is metered, it is sent to an extruder to process a plasticized and homogenized melt, and the melt is transported through the pipeline. The filter is filtered, distributed through the flow channel and the die, and then can be chilled into a thick sheet by a flat film method-a melt through a cast casting sheet, and the thick sheet is biaxially stretched into a film, and the biaxial stretching process is first longitudinally. After the horizontal or vertical and horizontal synchronization, or by the bubble tube method, the melt is released into the initial film and quenched, and the initial film is longitudinally blown and longitudinally stretched into a film, and the film is cooled and drawn to measure thickness. After corona treatment or flame treatment, the mother roll is harvested, and the mother roll can be subjected to aging treatment, and finally cut or cut into finished film products. '

When the flat film method is used for the longitudinal stretching of the longitudinal direction or the biaxial stretching process of the bubble tube method, in the longitudinal stretching unit, the temperatures of the two faces of all the rolls through which the film passes are controlled separately, and the functional layer passes through The surface of the rolls is all coated with Teflon. , the paper-plastic non-adhesive composite biaxially oriented polypropylene film with the above structure and a preparation method thereof, the advantages of which are: The biaxially oriented polypropylene film of the present invention comprises a base layer and a functional surface layer, wherein the base layer and the functional surface layer composed of the substance described in the technical solution are co-extruded and stretched, and the functional layer can be directly The paper, pre-printed paper or another film composite containing this layer realizes the non-gelling of the paper-plastic composite, eliminating the glue coating process, simplifying the compounding process and saving energy. Moreover, no toxic gas is produced during compounding, which is environmentally friendly, safe and hygienic. At the same time, the biaxially oriented polypropylene film produced by the structure and composition has a high heat-sealing strength, and is high in peeling strength with a paper, a preprinted paper or another film containing the functional layer. Conducive to the manufacture and promotion of products.

DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a cross-sectional structural view showing an embodiment of the present invention.

Figure 2 is a cross-sectional structural view showing another embodiment of the present invention.

Figure 3 is a process flow of the method for preparing a film of the present invention. detailed description

The invention will now be further described with reference to the accompanying drawings.

According to FIG. 1 and FIG. 2, the biaxially oriented polypropylene film for paper-plastic non-adhesive composite of the present invention comprises a surface layer 5, a core layer 3 and a paper material, a preprinted paper or a film which are sequentially disposed. Another film composite functional layer 1 of the layer, when the film is manufactured, the surface layer 5, the core layer 3 and the functional layer 1 are co-extruded composite structures, and the three layers constitute the most basic three-layer structure of the film of the invention. , As shown in Figure 1. In addition, in order to improve the performance of the film, the last surface layer 4 is provided between the surface layer 5 and the core layer 3, and the next surface layer 2 is provided between the core layer 3 and the functional layer 1. The film formed by this five-layer structure constitutes another embodiment of the present invention, as shown in FIG. The surface layer 5 is a blend containing polypropylene and an anti-blocking agent or a blend containing polypropylene, high-density polyethylene, and an antioxidant, wherein the polypropylene contained in the surface layer 5 is isotactic polypropylene, copolymerized. Propylene (such as ethylene-propylene copolymer, ethylene-propylene-butene copolymer), anti-blocking agent is silica (S i0 ₂ ), methyl methacrylate (PMMA), etc., antioxidants can be 1010, 1076 Wait. According to different manufacturing requirements, the next surface layer 2, core layer 3 and last table 4 can be the following three ways: First, the core layer 3 contains 60 ~ 100% isotactic polypropylene or less than 100% of the above content a mixture of isotactic polypropylene and one or more of a hydrogenated petroleum resin, an antistatic agent, and a slip agent; the next surface layer 2 and the last surface layer 4 contain 60 -

100% isotactic polypropylene or less than i ooy from the above content. a mixture of isotactic polypropylene and one or more of a hydrogenated petroleum resin, an antistatic agent, and a slip agent; second, a layer of the next surface layer 2, the core layer 3, and the last surface layer 4 or The multilayer contains titanium dioxide; third, one or more layers of the next surface layer 2, the core layer 3 and the last surface layer ⁴ There are calcium carbonate and/or polybutylene terephthalate. The functional layer 1 is an ethylene-butene copolymer, an ethylene-octene copolymer, an ethylene-butene-octene copolymer, a maleic anhydride graft modified product of an ethylene-butene copolymer, and an ethylene-octene copolymer. Maleic anhydride graft modification, maleic anhydride graft modification of ethylene-butylene-octene copolymer or a blend thereof, or any of the above copolymers, modifications, 'blends a re-blend of the component with a hydrogenated petroleum resin, wherein the butene content of the ethylene-butene copolymer is 10 to 30%, and the octene content of the ethylene-octene copolymer is 5 to 20%, ethylene- a butene-octene copolymer having a butene content of 1 to 30% and an octene content of 1 to 20%, an ethylene-butene copolymer of a maleic anhydride graft modified product, and an ethylene-octene copolymer of a horse The graft ratio of the maleic anhydride graft modified product of the anhydride anhydride graft modified product and the ethylene-butene-octene copolymer was 0.5 to 2%. The antistatic agent may be glyceryl monostearate or bis(β-hydroxyethyl) octadecylamine, and the slip agent may be erucamide, oleic acid amide, methylene bis stearamide (EBS), hydrogenated. The petroleum resin may be a carbon-5 product or a carbon-9 product, ARAM product P-125 of Arakawa, Japan, and the latter, such as an active ingredient of EXXON-MOBIL's addition agent PA609 (for the convenience of expressing this patent) Remember as the leg 09).

The hydrogenated petroleum resin in the functional layer 1 accounts for Ί - 30% by weight of the layer.

The functional layer 1 accounts for 10 to 50% by weight of the film.

As shown in FIG. 3, the film preparation method of the present invention has the following process:

In the figure: A is the raw material (including the main raw material, the modified material, the additive masterbatch), B is the melt, C is the thick piece, D is the film, E is the finished product, F is the extruder extrusion process, G is the step In the cold process, H is a biaxial stretching process, I is a corona treatment or a flame treatment process, K is an aging treatment, a slitting step, and J is an initial tube film. The selected raw materials A (including main raw materials, modified materials, additive masterbatch) are pre-mixed according to the design formula, and evenly stirred. After the resin is metered, it is sent to the extruder to process F into plasticized and homogenized melting. Body B, the melt is transported through the pipeline, filtered by the filter, distributed through the flow path and the die, and then can be formed into a thick sheet C by a flat film method-by quenching (casting of the cast piece) G, and the thick piece is bidirectionally (First longitudinally and then horizontally or vertically and horizontally) to stretch H into film D, or by bubble tube method, a melt is released from the mold and then quenched into G to form the initial film J, and the initial film is bidirectional (in the transverse direction) Longitudinal traction) stretching H into film D, the film is cooled, drawn to thickness, and then corona treated or flame treated I to form a parent roll, the mother roll is subjected to aging treatment, and finally cut or re-cut K into a finished film. E. among them:

The extruder and die used in the method have a temperature control of 225 ~ 265 ° C, a quenching temperature of 15 - 4 (TC, surface treatment strength of 35 ~ 45 mN / m, in the flat method, can be produced according to The conditions of the equipment are two-step stretching or simultaneous stretching. In the two-step stretching process, the longitudinal stretching unit temperature is controlled at 50~150°C, and the transverse stretching unit temperature is controlled at 100~180. C, longitudinal The draw ratio is controlled at 4.5 ~ 6.5, and the transverse draw ratio is controlled at 7 ~ 10; In the synchronous stretching process, the longitudinal and transverse stretching unit temperature is controlled at 100 ~ 180 ° C, and the infrared preheating temperature is controlled at 300 ~ 600 ° C, the longitudinal stretch ratio is controlled at 4.5 ~ 6.5, the transverse stretch ratio is controlled at 6 ~ 10; In the bubble tube method, the temperature in the initial film preheating oven is controlled at 260 ~ 430 ° C, horizontal The temperature in the inflation oven is controlled at 300 ~ 530 °C, the longitudinal stretching temperature is controlled at 135~150'C, the longitudinal stretching ratio is controlled at 4.5-8.0, and the transverse stretching ratio is controlled at 5.0-8.0 _0.

When the flat film method is produced by a stepwise biaxial stretching or a bubble tube biaxial stretching process, in the longitudinal stretching unit, the temperatures of both faces of all the rolls through which the film passes are controlled separately; the functional layer 1 passes through The surface of the rolls is all coated with Teflon.

The functional layer 1 accounts for 10 to 50% by weight of the film.

Note 1: The standards on which the product performance tests are based in the following examples are as follows:

* Note: At 23. In the C/50% humidity environment, the front side of the film functional layer 1 with a width of 15 mm and a weight of 300 g/cm ³ gray-white cardboard ("Huafeng Paper") is 115. C, sealed under a condition of 0.30 MPa for 60 seconds, and after cooling for 3 minutes, tested according to ASTM D903 standard.

Description 2: The percentages or percentages of the formulations described in the following examples are by weight. Note 3: In the following examples, the melt index (2.16 kg, 190 °) of the components of the functional layer 1 were respectively: ethylene-butene copolymer: 4.5 g for eight minutes; ethylene-octene copolymer: 7 g for eight 0 minutes; 'Ethylene-butene-octene copolymer: 5 g for 80 minutes; Maleic anhydride graft modification of ethylene-butene copolymer: 3.5 g Q min; Malay of ethylene-octene copolymer Anhydride graft modification: 5.5 g 0 min; maleic anhydride graft modification of ethylene-butene-octene copolymer: 4 g/10 min.

Example 1:

The composition of the functional layer 1 is: 70% ethylene-butene copolymer, 30% ethylene-butene copolymer graft modification of maleic anhydride, wherein the content of butene in the ethylene-butene copolymer is 30%, the graft ratio of the maleic anhydride graft modified product of the ethylene-butene copolymer was 0.5%.

The composition of the core layer 3 is: 99.75% isotactic polypropylene (isotacticity: 97%, melt index: 3 g/10 minutes), 2,500 ppm of glyceryl monostearate;

The composition of the surface layer 5 is: a blend of 99.2% of high-density polyethylene (melt index of 0.05 g/10 min) and an ethylene-propylene copolymer (melt index of 7 g of 0 min) in a 9:11 configuration , 8000ppm antioxidant 1010.

The total thickness of the prepared product was 20 μm, the functional layer 1 was 6 μm thick, and the functional layer 1 was 30% of the total weight of the film. The preparation method comprises the following steps: pre-mixing the selected raw materials 包括 (including the main raw materials, the modified materials and the additive masterbatch) according to the design formula, and uniformly stirring, and after the resin is metered, it is sent to the extruder to be processed into plasticized and homogenized F. Melt B, the melt is transported through a pipe, filtered through a filter, distributed through a flow path and a die, by quenching (casting a cast piece) of a slab C, and the slab is biaxially stretched to form a film D. The thickness of the film D is controlled by an automatic thickness measuring device, and the film is subjected to corona treatment or flame treatment to increase the wetting tension. The treated film is drawn into a parent roll, the mother roll is subjected to aging treatment, and finally the film is finished into a film finished product E. Among them, the equipment is a flat film biaxially oriented polypropylene film production line provided by BRUECKNER, the main extruder screw is a single screw extruder with a diameter of 150 awake and a length to diameter ratio of 33:1. The extruder was a single screw extruder with a screw diameter of 120 awake and a length to diameter ratio of 30:1. Extrusion temperature except for the feeding section is 100 °C, the other sections are 245 °C, 'the temperature of each zone of the filter is 250 °C, the temperature of each zone of the die is 235 °C; quenching (casting casting) The film has a temperature of 23 ° C; longitudinal stretching: the surface of the roller through which the functional layer 1 passes is all coated with a polytetrafluoroethylene, and the roller temperature corresponding to the functional layer 1 is 6 (TC, the roller temperature corresponding to the non-functional layer) , preheating zone temperature is 130 ° C, stretching zone temperature is 110 ° C, setting temperature 135 ° C, draw ratio of 4.9; transverse stretching temperature: preheating each zone is 175 ° C, stretching zones are 160.C, setting zones were 165 ° C, a draw ratio of 9; corona treatment power of 25w min / m ^2, the performance of the manufactured product are as follows:

(1) Thickness: 20μπι. (2) Density: 0·83g/cm

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

(4) Heat seal strength: 7.0 ΝΛ5诵.

(5) Peel strength (film-paper): 3.5 N/15mm

(6) Haze: 76.2% - ( 7 ) 'Gloss: 8.5 %

- ( 8 ) Thermal shrinkage (longitudinal / lateral): 3.5% 8.5 %

(9) Wetting tension: 40mN/m

'Example 2:

The composition of the functional layer 1 is: 50% ethylene-butene copolymer, 20% ethylene-butene copolymer maleic anhydride graft modification, 30% P-125, wherein ethylene-butene copolymerization The content of butene in the product was 10%, and the graft ratio of the maleic anhydride graft modified product of the ethylene-butene copolymer was 2%.

The next surface layer 2, the composition of the last surface layer 4 are: 99.8% isotactic polypropylene (96% isotacticity, melt index is 2.5 g 80 minutes), 2000 ppm of glyceryl monostearate;

The composition of the core layer 3 is: 99.7% isotactic polypropylene (isotacticity: 96%, melt index: 2.5 g/10 min), 2000 ppm of glyceryl monostearate, 100 ppm of methylene bis stearamide ;,

The composition of the surface layer 5 was: 99.8% isotactic polypropylene (isotacticity 96%, melt index 3 g 0 min), 2000 ppm silica (Si0 ₂ ).

The total thickness of the prepared product was 18 μηι, the functional layer 1 was 5 μm thick, and the functional layer 1 was 27.8% of the total weight of the film. In the preparation method, except for the extruder parameters, the other parameters are the same as in the first embodiment, and the extruder parameters are:

The main extruder is a series single screw extruder:

Screw diameter: Melt extruder 160 hidden, metering extruder 160 legs

Aspect ratio: Melt extruder 20: 1, Metering extruder 20: 1

The auxiliary extruder is a single screw extruder: .

Screw diameter: 135mm

Aspect ratio: 30: 1

The specific performance of the product is: '

(1) Thickness: 18μιη

( 2 ) Density : 0.9 g/cm ·

(3) Tensile strength (longitudinal/lateral): 110 MPa /200MPa (4) Heat seal strength: 6.0 N eight 5 hidden

(5) Peel strength (film-paper): 3.2 N/15mm

(6) Haze: 1.2%

(7) Heat shrinkage rate (longitudinal/lateral): 2.0%/1.2%

(8) Wetting tension: 40mN/m

Implementation ^ 3:

The composition of the functional layer 1 is: 80% ethylene-octene copolymer, 19% ethylene-butene copolymer maleic anhydride graft modification, 1% P-125, wherein ethylene-octene copolymerization The content of octene in the solution was 20%, and the graft ratio of the maleic anhydride graft modified product of the ethylene-butene copolymer was 1%.

The next surface layer 2, the composition of the last surface layer 4 are: 99.8% isotactic polypropylene (95% isotacticity, melt index 2 g 80 minutes), 2000ppra glyceryl monostearate;

The composition of the core layer 3 is: 99.75% isotactic polypropylene (isotacticity: 95%, melt index: 2 g for 80 minutes), 2000 ppm of glyceryl monostearate, 500 ppm of erucamide;

The composition of the surface layer 5 was: 99.8% isotactic polypropylene (isotacticity: 96%, melt index: 3 g/10 min), 2000 ppra of silica (Si0 ₂ ). '

The total thickness of the prepared product was 18 μηι, the functional layer 1 was 5.4 μm thick, and the functional layer 1 was 30% of the total weight of the film. The preparation method is the same as the first embodiment except for the following two aspects:

1. The parameters of the main extruder and auxiliary extruder are:

The main extruder is a series single screw extruder:

Screw diameter: Melt extruder 230 hidden, metering extruder 27 匪

Aspect ratio: Melt extruder 20: 1, Metering extruder 20: 1

The auxiliary extruder is a single screw extruder:

Screw diameter: ' 135mm

Aspect ratio: 33: 1

2. Functional layer 1 The surface of the roller passed through does not contain a Teflon coating.

The specific performance of the product is:

(1)Thickness : 18μηι

( 2 ) Density : 0.9 g/cm

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

(4) Heat seal strength. : 6.3. N eight 5 hidden (5) Peel strength (film-paper): 3.8 N/15mm

(6) Haze: 1.5%

( 7 ) Thermal shrinkage (longitudinal / lateral): 3.0%/1.0%

(8) Wetting tension: 40mN/m

Example 4:

The composition of functional layer 1 is: 20% ethylene-butene copolymer, 45% ethylene-octene copolymer, 20% ethylene-octene copolymer maleic anhydride graft modification, 15% P-125 , wherein the ethylene-butene copolymer has a butene content of 25%, the ethylene-octene copolymer has an internal octene content of 5%, and the ethylene-octene copolymer has a maleic anhydride graft modified product. It is 0.5%. '

Next layer 2. The composition of the last surface layer 4 is: 100% isotactic polypropylene (isotacticity is 94%, melting index is 3.5 g/10 minutes);

The composition of the core layer 3 is: 80% isotactic polypropylene (94% isotacticity, melt index: 3.5 g/10 minutes), 19.8% P-125, 2000 ppm of glyceryl monostearate;

The composition of the surface layer 5 was: 99.8% isotactic polypropylene (96% isotacticity, melt index 3.5 g/10 minutes), 2000 ppm methyl methacrylate (PMMA).

The total thickness of the prepared product was 18 μm, the functional layer 1 was 7.2 μm, and the functional layer 1 accounted for 40% of the total weight of the film. In the preparation method, except for the extruder, the other parameters are the same as in the first embodiment, and the extruder parameters are respectively:

The main extruder is a twin screw extruder:

Screw diameter: 169mm, 169mm

Length to diameter ratio: 32: 1, 32: 1 ' The auxiliary extruder is a single screw extruder:

Screw diameter: 150mm '

Aspect ratio: 33: 1

The specific performance of the product is:

(1)Thickness : 18μηι

( 2 ) Density : 0.91 g/cra

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

(4) Heat seal strength: 6.0 ΝΛ5瞧

(5) Peel strength (film-paper): 4.5 N/15 legs

(6) Haze: 1.2% ( ) Thermal shrinkage (longitudinal / lateral): 3.0% .2%

(8) Wetting tension: 40mN/m

Example 5

The composition of the functional layer 1 is: 60% ethylene-octene copolymer, 20% ethylene-butene-octene copolymer, 10% ethylene-octene copolymer maleic anhydride graft modification, 10 % P-125, wherein the ethylene-octene copolymer has a octene content of 10%, the ethylene-butene-octene copolymer has a butene content of 1%, the octene content is 20%, and ethylene-octene The graft ratio of the copolymerized maleic anhydride graft modification was 1.2%.

' The next surface layer 2. The composition of the last surface layer 4 is: 100% isotactic polypropylene (equal degree is 96.5%, melt index is 2.8 g/10 minutes);

The composition of the core layer 3 is: 100% isotactic polypropylene (equal degree is 96.5%, melt index is 2.8 g/10 minutes); - the composition of the surface layer 5 is: 99. isotactic polypropylene (isotacticity) It is 96%, the melt index is 3 g 0 min), 2000 ppm of methyl methacrylate (PMMA).

The total thickness of the prepared product was 40 μm, the functional layer 1 was 20 μm thick, and the functional layer 1 was 50% of the total weight of the film. The other methods and control parameters are the same as in the first embodiment except for the following two aspects:

1. The flat film method biaxially oriented polypropylene film production line supplier is Japan Mitsubishi Heavy Industries (ΜΗΙ) Co., Ltd., the main extruder and auxiliary extruder parameters are:

The main extruder is a series single screw extruder, the screw parameters are:

Melt extruder: diameter is 115 hidden, aspect ratio is 20: 1

Metering extruder: diameter is 115 hidden, length to diameter ratio is 20: 1

The auxiliary extruder is a single screw extruder with a screw diameter of 120 and a length to diameter ratio of 30:1.

The specific performance of the product is:

(1)Thickness : 40μπι

( 2 ) Density : 0.9 g/cm

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

(4) Heat seal strength: 12.0 N/15rara

(5) Peel strength (film-paper): ⁵ .8 N/1 ⁵ wake up

( 6 ) Haze: 3.5 %

(7) Thermal shrinkage (longitudinal/lateral): 3.8%/1.4% (8) Wetting tension: 40mN/m

Example 6:

The composition of functional layer 1 is: 20% ethylene-butene copolymer, 20% ethylene-octene copolymer, 40% ethylene-octene copolymer maleic anhydride graft modification, 20% EM609 , wherein the ethylene-butene copolymer has a butene content of 20%, the ethylene-octene copolymer has a octene content of 15%, and the ethylene-octene copolymer has a maleic anhydride graft modified graft. The rate is 2%. - The next surface layer 2, the last surface layer 4 is 99.85% isotactic polypropylene (isotacticity of 97.5%, melt index of 3.2 g/10 minutes), 500 _P pm of two (P - hydroxyethyl) octadecylamine, l OOOppm oleic acid amide;

The composition of the core layer 3 is: 99. 85% isotactic polypropylene (isotacticity of 97.5%, melt index of 3.2 g 8%), 500 ppm of glyceryl monostearate, oil of 1000 ppm Acid amide

The composition of the surface layer 5 is: 99.8% of isotactic polypropylene (isotacticity of 97.5%, melt index of 3.2 g for 10' minutes), 2000 ppm of silica (Si0 ₂ ).

The total thickness of the prepared product is 18 μm, the functional layer 1 is 5 μm thick, and the functional layer 1 accounts for 27.8% of the total weight of the film. The preparation method comprises the following steps: pre-mixing the selected raw materials 包括 (including the main raw materials, the modified materials and the additive masterbatch) according to the design formula, and uniformly stirring, and after the resin is metered, it is sent to the extruder to be processed into plasticized and homogenized F. Melt B, the melt is transported through a pipe, filtered through a filter, distributed through a flow path and a die, by quenching (casting a cast piece) G into a thick sheet C, and the slab is biaxially stretched to form a film D. The thickness of the film D is controlled by an automatic thickness measuring device, and the film is subjected to corona treatment or flame treatment to increase the wetting tension. The treated film is drawn into a parent roll, the mother roll is subjected to aging treatment, and finally the film is finished into a film finished product E. Among them, the equipment is a synchronous biaxially oriented polypropylene film production line supplied by BRUECKNER, Germany. The main extruder has a screw diameter of 169, a twin-screw extruder with a length to diameter ratio of 32:1, and an auxiliary extruder. It is a single screw extruder with a screw diameter of 135 mm and a length to diameter ratio of 33:1. Extrusion machine temperature except for the feeding section is 20 (TC, the other sections are 245 °C, the temperature of each zone of the filter is 25 (TC, the temperature of each zone of the die is 235 °C; quenching (casting casting) The temperature is 25 °C; the infrared preheating temperature is 500 °C, the longitudinal and transverse stretching temperature is controlled at 157 'C, the longitudinal stretching ratio is 5, the transverse stretching ratio is 7; the corona treatment power is 30w min. /m ² , the performance of the manufactured products is as follows:

(1)Thickness : 18μπι

( 2 ) Density : 0. 9 g/cm

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

(4) Heat seal strength: 6. O N/ 15mm

(5) Peel strength (film-paper): 4. 3 N/15ram (6) Haze: 1.8%

(7) Thermal shrinkage (longitudinal/lateral): 2.5%/1.0%

(8) Wetting tension: 41mN/m

The biaxially oriented polypropylene film produced by the structures, compositions and preparation methods described in Examples 1 to 6 has a simple structure and a high heat seal strength, and is compatible with paper, preprinted paper or another functional layer 1 The product of composite film has high peeling strength and is conducive to the manufacture and promotion of the product.

Example 7

The functional 厣1 component is: 60% ethylene-butylene-octene copolymer, 15% ethylene-butene-octene copolymer maleic anhydride graft modification, 25% EM609, wherein, ethylene The butene-octene copolymer had a content of butene of 30% and an octene content of 1%, and the grafting ratio of the maleic anhydride graft modified product of the ethylene-butene-octene copolymer was 0.5%.

The composition of the next surface layer 2 and the last surface layer 4 are: 70% isotactic polypropylene (equal degree is 95.5%, melt index is 2.8 g for 0 minutes), 14% of 609, 14% of calcium carbonate, 2 % titanium dioxide;

The composition of the core layer 3 is: 70% isotactic polypropylene (equal degree is 95.5%, melt index is 2.8 g for 80 minutes), 12% of EM609, 14% of calcium carbonate, 4% of titanium dioxide;

The composition of the surface layer 5 was: 99.8% isotactic polypropylene (isotacticity: 96%, melt index: 3 g for eight minutes), and 2000 ppm of silica (SiO ₂ ).

The total thickness of the prepared product was 47 μίΐι, the functional layer 1 was 7 μηη thick, and the functional layer 1 accounted for 21.5% of the total weight of the film. The preparation method comprises the following steps: pre-mixing the selected raw materials 包括 (including the main raw materials, the modified materials and the additive masterbatch) according to the design formula, and uniformly stirring, and after the resin is metered, it is sent to the extruder to be processed into plasticized and homogenized F. Melt B, the melt is transported through a pipe, filtered through a filter, distributed through a flow path and a die, by quenching (casting a cast piece) G into a thick sheet C, and the slab is biaxially stretched to form a film D. The thickness of the film D is controlled by an automatic thickness measuring device, and the film is subjected to corona treatment or flame treatment to increase the wetting tension, and the treated film is subjected to traction to form a parent roll, the mother roll is subjected to aging treatment, and finally the film is cut into a finished film E. . Among them, the equipment is a flat film biaxially oriented polypropylene film production line provided by BRUEC ER, the main extruder screw is a single screw extruder with a diameter of 150 hidden and a length to diameter ratio of 33:1. The auxiliary extruder is a single screw extruder with a screw diameter of 120 and a length to diameter ratio of 30:1. Extrusion temperature except for the feeding section is 100 °C, the other sections are 235 °C, the temperature of each zone of the filter is 245 °C, and the temperature of each zone of the die is 230 °C; quenching (casting casting) The temperature is 25 ° C; longitudinal stretching: the surface of the roller through which the functional layer 1 passes is all coated with Teflon, and the roller temperature corresponding to the functional layer 1 is 9 (TC, the roller temperature corresponding to the non-functional layer) , preheating zone temperature is 13 (TC, tensile zone temperature is 115'C, setting temperature 135 ° C, draw ratio of 5.6; transverse stretch temperature: preheating each zone is 175. C, stretching zones Both are 160 ° C, each zone is 165 ° C, the draw ratio is 9; Halo processing power is 30w min. /m ²

The specific performance of the product is:

(1)Thickness: 47μπι

( 2 ) Density : 0· 65g/cm

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

(4) Heat seal strength : 9.0 N/15mm

(5) Peel strength (film-paper): 5.1 N/15mm

(6) Light transmittance: 20%

(7) Whiteness: 90%

(8) Heat shrinkage rate (longitudinal / lateral): 3.5% .5%

(9) Wetting tension: 41mN/m

Example 8

The composition of the functional layer 1 is: 80% ethylene-butene-octene copolymer, 20% ethylene-butene-octene copolymer maleic anhydride graft modification, wherein ethylene-butene-octane The content of butene in the olefin copolymer is 15%, the octene content is 10%, and the grafting of the maleic anhydride graft modification of the ethylene-butene-octene copolymer is 1%.

The composition of the next surface layer 2 and the last surface layer 4 are: 92% isotactic polypropylene (isotacticity 94.5%, melt index 2.2 g/10 minutes), 4% polybutylene terephthalate 4% titanium dioxide;

The composition of the core layer 3 is: 60% isotactic polypropylene (isotacticity 94.5%, melt index 2.2 g 0 minutes), 20% EM609 12% calcium carbonate, 8 % polybutylene terephthalate Diester

The composition of the surface layer 5 is: 99.1% of the high-density polyethylene (melt index of 0.05 g for 0 minutes) and ethylene-propylene-butene copolymer (melt index of 7.5 g/10 minutes) in a 9:11 configuration. Blend, 6000ppm Antioxidant 1010 3000ppm Antioxidant 1076

The total thickness of the prepared product is 60 μm, the functional layer 1 is 5.3 μm thick, and the functional layer 1 accounts for 10% of the total weight of the film. The preparation method is as follows: The selected raw materials (including the main raw material, the modified material, the additive masterbatch) are pressed. The design formula is pre-mixed and stirred evenly. After the resin is metered, it is sent to the extruder to process the plasticized, homogenized F melt B. The melt is transported through the pipeline, filtered by the filter, and distributed through the runner and the die. Quenching (casting of the cast piece) G into a thick sheet C, and the thick sheet is biaxially stretched to form a film D. The thickness of the film D is controlled by an automatic thickness measuring device, and the film is subjected to corona treatment or flame treatment to increase the wetting tension. The treated film is drawn into a parent roll, the mother roll is subjected to aging treatment, and finally the film is finished into a film finished product E. Among them, the equipment is a flat film biaxially oriented polypropylene film production line supplied by BRUECKNER, Germany. The main extruder screw is a single screw extruder with a diameter of 150 and a diameter ratio of 33:1. The auxiliary extruder is a single screw extruder with a screw diameter of 120 faces and a length to diameter ratio of 30:1. Extrusion machine temperature except for the feeding section is 18 (TC, other sections are 245 ° C, the temperature of each zone of the filter is 250 ° C, the temperature of each zone of the die is 235 ° C; quenching (casting casting) The temperature is 23 ° C; longitudinal stretching: the surface of the roller through which the functional layer 1 passes is all Teflon coating, and the roller temperature corresponding to the functional layer 1 is 9 (TC, the roller temperature corresponding to the non-functional layer, The preheating temperature of each zone is 135 °C, the temperature of each zone is 110'C, the setting temperature is 14 (TC, the draw ratio is 5.5; the transverse drawing temperature: the preheating zone is 176 °C, and each zone is stretched. For 162 ° C, each zone is 168 ° C, the draw ratio is 9; the corona treatment power is 28 w min. / m ² .

The specific performance of the product is:

(1)Thickness : 60μηι

( 2 ) Density : 0.62g/cra

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

(4) Heat seal strength: 5.5 N/15瞧

(5) Peel strength (film-paper): .1 N/15 hidden

(6) Transmittance: 17%

(7) Whiteness: 90%

(8) Heat shrinkage rate (longitudinal/lateral): 2.8%/1.3%

(9) Wetting tension: 41mN/m

The biaxially oriented polypropylene film produced by the structures, compositions and preparation methods described in Examples 7 and 8 has a high heat seal strength and is used for packaging seeds, feeds, and plastic particles after being combined with paper materials such as kraft paper; The product of the other film of the functional layer 1 has high whiteness, good light-shielding property, high peeling strength, and can be used as a synthetic paper, and is widely used for labels, handbags, and packaging substrates.

Example 9

The composition of the functional layer 1 is: 70% ethylene-butene copolymer, 30% ethylene-butene copolymer graft modification of maleic anhydride, wherein the content of butene in the ethylene-butene copolymer is 27.5%, the graft ratio of the maleic anhydride graft modified product of the ethylene-butene copolymer was 0.8%.

The composition of the core layer 3' is: 99.75% isotactic polypropylene (isotacticity 96.5%, melt index 3.5 g 80 minutes), 2500 ppm bis(β-hydroxyethyl) octadecylamine;

The composition of the surface layer 5 is: a blend of 99.2% of high-density polyethylene (melt index of 0.05 g/10 min) and an ethylene-propylene copolymer (melt index of 7 g of 0 min) in a 9:11 configuration , SOOOppm antioxidant 1010. The total thickness of the prepared product was 20 μm, the functional layer 1 was 6 μm thick, and the functional layer 1 was 30% of the total weight of the film. The preparation method comprises the following steps: pre-mixing the selected raw materials 包括 (including the main raw materials, the modified materials, and the additive masterbatch) according to the design formula, and uniformly stirring, and after the resin is metered, it is sent to the extruder to process F into plasticized, Homogenized melt B, the melt is transported through the pipeline, filtered by the filter, distributed through the flow path and the die, and after the melt is released from the mold, the G is cooled into the initial film J, and the initial film is bidirectional (in the transverse direction) Simultaneous longitudinal traction) Stretching H into film D, the film is cooled, drawn to thickness, and then corona treated or flame treated I to form a parent roll, and finally cut, re-rolled, and then slit K into a film finished product E . among them:

The equipment is a bubble tube biaxially oriented polypropylene film production line supplied by REIFENHAUSER, Germany. The main extruder screw is a single screw extruder with a diameter of 150 诵 and a length to diameter ratio of 33:1. The extruder was a single screw extruder with a screw diameter of 120 and a length to diameter ratio of 30:1. Extrusion machine temperature except for the feeding section is 18 (TC, other sections are 245 °C, the temperature of each zone of the filter is 250 °C, the temperature of each zone of the die is 245 °C; the quenching temperature of the air ring is 18 °C, the temperature in the pre-heating oven of the initial film is controlled at 350 °C, and the temperature in the transverse inflation oven is controlled at 420; the surface of the roller passing through the functional layer 1 is all coated with Teflon, and the functional layer 1 corresponds to The roll temperature was 80 ° C, the roll temperature corresponding to the non-functional layer was controlled at 135 ° C, the longitudinal stretch ratio was 5, the transverse draw ratio was 8.0, and the corona treatment power was 25 w min. /m ² .

The specific performance of the product is:

(1) Thickness : 20μπι

(2) Density : 0.83 g/cm

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

(4) Heat seal strength: 7.6 N/15mm.

(5) Peel strength (film-paper): 4.0 N/15mm

(6) Haze: 75.5%

(7) Gloss: 8·0 %

( 8 ) Thermal shrinkage (longitudinal / lateral): 3.4% 8%

( 9 ) Wetting tension : 40raN/m .

Example 10

The composition of functional layer 1 is: 52.5% ethylene-butene copolymer, 20% ethylene-butene copolymer maleic anhydride graft modification, 27.5% EM609, wherein ethylene-butene copolymer The content of butene was 12.5%, and the graft ratio of the maleic anhydride graft modified product of the ethylene-butene copolymer was 1.5%.

The composition of the next surface layer 2 and the last surface layer 4 are: 99.8% isotactic polypropylene (equal degree is 95.5%, melting The index is 3.5 g/10 min), 1000 ppm of bis(hydroxyethyl)dodecylamine, 1000 ppm of oleic acid amide; the composition of the core layer 3 is: 99.7% isotactic polypropylene (isotacticity is 95.5%, a melt index of 3.5 g/10 min), 2000 ppm of glyceryl monostearate, 100 ppm of oleic acid amide;

The composition of the surface layer 5 was: 99.8% isotactic polypropylene (equal degree 95.5%, melt index 3.5 g/10 minutes), 2000 ppm silica (Si0 ₂ ).

The total thickness of the prepared product was 18 μίη, the functional layer 1 was 5 μηη thick, and the functional layer 1 was 27.8% of the total weight of the thin layer. The preparation method was the same as that of Example 9 except for the main extruder and the longitudinal draw ratio. The extruder used in the present example was a tandem extruder, and the parameters were as follows:

Screw diameter: melt extruder 160, metering extruder 160 hidden

Aspect ratio: Melt extruder 20: 1, Metering extruder 20: 1

The longitudinal stretch ratio is 4.9

The specific performance of the product is:

(1)Thickness : 18μπι

( 2 ) Density : 0.9 g/cra

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

(4) Heat seal strength: 6.0 N/15mm

(5) Peel strength (film-paper): 3.2 N eight 5 hidden

(6) Haze: 1.2%.

(7) Heat shrinkage rate (vertical direction / transverse direction): 2.0%/1.2%

(8) Wetting tension: 40mN/m

The biaxially oriented polypropylene film produced by the structures, compositions and preparation methods described in Examples 9 and 10 has a simple structure and a high heat seal strength, and is compatible with paper, preprinted paper or another functional layer 1 The product of composite film has high peeling strength and is conducive to the manufacture and promotion of the product.

Example 11

The composition of the functional layer 1 is: 80% ethylene-butene-octene copolymer, 20% ethylene-butene-octene copolymer maleic anhydride graft modification, wherein ethylene-butene-octane The content of butene in the olefin copolymer was 10%, the octene content was 15%, and the graft ratio of the maleic anhydride graft modified product of the ethylene-butene-octene copolymer was 0.8%.

The composition of the next surface layer 2 and the last surface layer 4 are: 94% isotactic polypropylene (96% isotacticity, melt index 3 g/10 min), 4% polybutylene terephthalate 2% titanium dioxide;

The composition of the core layer 3 is: 90% isotactic polypropylene (isotacticity is 96%, melt index is 3 g for eight minutes), 6 % polybutylene terephthalate, 4% titanium dioxide;

The total thickness of the prepared product was 60 μηι, the functional layer 1 was 5.3 μm thick, and the functional layer 1 was 10% of the total weight of the film. The preparation method comprises the following steps: pre-mixing the selected raw materials 包括 (including the main raw materials, the modified materials and the additive masterbatch) according to the design formula, and uniformly stirring, and after the resin is metered, it is sent to the extruder to process F into plasticized and homogenized. Melt B, the melt is transported through the pipeline, filtered by the filter, distributed through the flow path and the die, and after the melt is released from the mold, the G is cooled into the initial film J, and the initial film is passed through the two-way (in the lateral direction) Longitudinal traction) stretching H into film D, the film is cooled, drawn to thickness, and then corrugated or flame treated I to form a parent roll, and finally cut, re-rolled, and then slit K into a film finished product E. among them:

The equipment is a bubble tube biaxially oriented polypropylene film production line supplied by REIFENHAUSER, Germany. The main extruder screw is a single screw extruder with a diameter of 150 hidden and a length to diameter ratio of 33:1. The extruder was a single screw extruder with a screw diameter of 120 and a length to diameter ratio of 30:1. Extruder temperature 24 (TC, filter temperature 250 °C, die temperature 24 (TC; quenching temperature at 17 ° C, temperature in the initial film preheating oven controlled at 350 ° C, transversely inflated oven) The temperature is controlled at 420 ° C; the surface of the roller through which the functional layer 1 passes is all Teflon coating, the roller temperature corresponding to the functional layer 1 is 80 ° C, and the roller temperature corresponding to the non-functional layer is controlled at 135 ° C, the longitudinal draw ratio was 5.6, the transverse draw ratio was 8.0, and the corona treatment power was 29 w min. / m ² .

The specific performance of the product is:

(1)Thickness: 60μπι

(2) Density : 0.62g/cm

(3) Tensile strength (longitudinal / transverse): 88 MPa /170MPa

(4) Heat seal strength: 5· 5 N/15mm

(5) Peel strength (film-paper): 4.1 N/15mra

(6) Light transmittance: 17%

(7) Whiteness: 90%

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

(9) Wetting tension: 41mN/m

Example 12:

The composition of functional layer 1 is: '70% ethylene-butene-octene copolymer, 10% ethylene-butene-octene copolymer: maleic anhydride graft modification, 20% P-125 Wherein the content of butene in the ethylene-butene-octene copolymer is 20%, octene content of 5%, graft ratio of maleic anhydride graft modified product of ethylene-butene-octene copolymer. The composition of the next surface layer 2 and the last surface layer 4 are: 90% isotactic polypropylene (96% isotacticity, melt index 3 g 80 minutes), 10% calcium carbonate;

The composition of the core layer 3 is: 70% isotactic polypropylene (isotacticity: 96%, melt index: 3 g for eight minutes), 14% P-125, 10% calcium carbonate, 6% titanium dioxide;

The composition of the surface layer 5 was: 99.8% isotactic polypropylene ' (isotacticity: 96%, melt index: 3 g / 1 (minute), 2000 ppm of silica (Si0 ₂ ).

The total thickness of the prepared product was 47 μίη, the functional layer 1 was 7 μm thick, and the functional layer 1 accounted for 21.5 % of the total weight of the film. The preparation method except that the surface of the roller passing through the functional layer 1 does not contain a Teflon coating, and the roller temperature corresponding to the functional layer 1 is 6Q ° C, and other equipment and control parameters are the same as in the embodiment 11:

The specific performance of the product is:

(1) Thickness: 47μιη

( 2 ) Density : 0.67g/cm

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

(4) Heat seal strength : 9.0 N/15ram

(5) Peel strength '(film-paper): 4.9 N8 5 hidden

(6) Transmittance: 21%

(7) Whiteness: 90%

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

(9) Wetting tension: 41mN/m

The biaxially oriented polypropylene film produced by the structures, compositions and preparation methods described in Examples 11 and 12 has a high heat-sealing strength and is used for packaging seeds, feeds, and plastic particles after being combined with paper materials such as kraft paper; The product of the other film of the functional layer 1 has high whiteness, good light-shielding property, high peeling strength, and can be used as a synthetic paper, and is widely used for labels, handbags, and packaging printed substrates.

Claims

Claim

A biaxially oriented polypropylene film for paper-plastic non-adhesive composite, characterized in that it comprises a surface layer (5), a core layer (3) and a paper material, which can be directly combined with a co-extruded composite. Preprinted paper or functional layer (1) composited with another film of this layer.

The biaxially oriented polypropylene film for paper-plastic-free composite according to claim 1, characterized in that: the surface layer (4) and the core layer (3) are provided with a last surface layer (4), a core layer (3) The next surface layer (2) is provided between the functional layer (1) and the functional layer (1). _

.

The biaxially oriented polypropylene film for paper-plastic-free composite according to claim 2, wherein the surface layer (5) is a blend containing polypropylene and an anti-blocking agent or is a polypropylene-containing A blend of density polyethylene and antioxidants.

The biaxially oriented polypropylene film for paper-based rubber-free composite according to claim 2, wherein: the core layer (3) contains 60 to 100% of isotactic polypropylene or less than 100% of the above content. a mixture of isotactic polypropylene and hydrogenated petroleum resin, antistatic agent, slip agent, and the next surface layer (2) and the last surface layer (4) contain 60 to 100% isotactic Polypropylene or a mixture of isotactic polypropylene of less than 100% of the above content and one or more of a hydrogenated petroleum resin, an antistatic agent, and a slip agent.

The biaxially oriented polypropylene film for paper-plastic-free composite according to claim 2, wherein: the layer of the next surface layer (2), the core layer (3) and the last surface layer (4) Or multiple layers containing titanium dioxide.

The biaxially oriented polypropylene film for paper-plastic-free composite according to claim 2, wherein: the layer of the next surface layer (2), the core layer (3) and the last surface layer (4) Or multiple layers containing calcium carbonate and/or polybutylene terephthalate. ·

The biaxially oriented polypropylene film for paper-based rubber-free composite according to claim 1, wherein the functional layer (1) is an ethylene-butene copolymer, an ethylene-octene copolymer, and an ethylene-butyl group. Alkenyl-octene copolymer, maleic anhydride graft modification of ethylene-butene copolymer, maleic anhydride graft modification of ethylene-octene copolymer, horse of ethylene-butene-octene copolymer a re-blend of the anhydride anhydride graft modification or a blend thereof, or any of the above copolymers, modifiers, blends, respectively, with a hydrogenated petroleum resin, wherein the ethylene-butene copolymer The content of butene is 10~30%, the content of octene in the ethylene-octene copolymer is 5-20%, the content of butene in the ethylene-butene-octene copolymer is 1~30%, and the content of octene is 1. ~203⁄4, ethylene - Maleic anhydride graft modification of butene copolymer, maleic anhydride graft modification of ethylene-octene copolymer and maleic anhydride graft modification of ethylene-butene-octene copolymer The technical rate is 0.5 to 2%.

The biaxially oriented polypropylene film for paper-based rubber-free composite according to claim 7, wherein the hydrogenated petroleum resin accounts for 1 to 30% by weight of the functional layer (1).

9. The biaxially oriented polypropylene film for paper-plastic-free composite according to claim 1, wherein the functional layer (1) accounts for 10 to 50% by weight of the film.

10. A method for preparing a biaxially oriented polypropylene film for a paper-plastic composite without glue, characterized in that: the process flow is:

The selected main raw materials, modified materials and additive masterbatch are pre-mixed according to the design formula, and evenly stirred. After the resin is metered, it is sent to an extruder to process a plasticized and homogenized melt, and the melt is transported through the pipeline. The filter is filtered, distributed through the flow channel and the die, and then the flat film method---the melt is cast into a thick sheet by casting the sheet, and the thick sheet is biaxially stretched into a film, and the biaxial stretching process is first After the longitudinal direction, the horizontal or vertical and horizontal synchronization, or according to the bubble tube method - after the melt is released into the original film and quenched, the initial film is blown up and longitudinally stretched into a film, and the film is cooled and drawn. Thick, then corona treatment or flame treatment, harvesting the parent roll, the parent roll can be aged, and finally cut or re-cut into finished film.

A method for preparing a biaxially oriented polypropylene film for paper-based rubber-free composite according to claim 10, which is characterized in that:

When the flat film method is used for the longitudinal stretching of the longitudinal direction or the biaxial stretching process of the bubble tube method, in the longitudinal stretching unit, the temperatures of the two faces of all the rolls through which the film passes are all controlled separately, the functional layer (1) The surfaces of the rollers that pass through are all Teflon-coated.

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