High-viscosity BOPP (biaxially-oriented polypropylene) adhesive-free film and preparation process thereof
By designing a high viscosity BOPP adhesive-free film with a multi-layer coextruded structure in the composite film, the existing composite film lacks barrier, mechanical properties and adhesion, and the effect of high heat seal strength and viscosity is achieved.
Patent Information
- Application Number
- CN202411942032.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-26
- Publication Date
- 2025-06-13
AI Technical Summary
The existing composite films lack sufficient barrier, mechanical properties and adhesion, and usually require good adhesion to paper, etc. through adhesives such as glue.
A high viscosity BOPP adhesive-free film is provided, and the film body is a multi-layer coextruded structure, including an upper surface layer, a core layer and a lower surface layer. The upper surface layer is a polyolefin layer, the core layer is a polypropylene layer, and the lower surface layer is an adhesive functional layer. Through specific component ratios and process flow, the film's viscosity and heat seal strength can be improved.
The high heat seal strength and viscosity of the high viscosity BOPP adhesive-free film are achieved, and it can easily adhere to other objects without the need for glue and other substances.
Smart Images
Figure CN120137541A_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the technical field of composite films, and specifically, to a high-viscosity BOPP non-adhesive film and a preparation process thereof. Background Art
[0002] Existing composite films often lack sufficient barrier and mechanical properties and do not have adhesiveness. Generally, adhesives such as glue are required to achieve good adhesion with papers and the like. Summary of the Invention
[0003] An object of the embodiments of the present disclosure is to provide a high-viscosity BOPP non-adhesive film and a preparation process thereof to solve the above problems existing in the prior art.
[0004] To solve the above technical problems, on the one hand, an embodiment of the present disclosure provides a high-viscosity BOPP non-adhesive film, including a film body. The film body is a multi-layer co-extrusion structure. The thickness of the film body is 15 - 20 um. The film body includes an upper surface layer, a core layer, and a lower surface layer. The upper surface layer is a polyolefin layer, the core layer is a polypropylene layer, and the lower surface layer is an adhesive functional layer.
[0005] In some embodiments, the thickness of the core layer is 12 - 17 um, and the core layer includes the following components in parts by weight: 90 - 99 parts of random copolymerized polypropylene and 1 - 10 parts of antistatic masterbatch.
[0006] In some embodiments, the antistatic masterbatch includes 75 - 85 parts by weight of isotactic homopolypropylene and 15 - 25 parts by weight of migratory antistatic agent.
[0007] In some embodiments, the migratory antistatic agent component includes 60 parts by weight of polypropylene, 20 parts by weight of ethoxyamine, and 20 parts by weight of glycerol monostearate.
[0008] In some embodiments, the lower surface layer is composed of one or more of ethylene-vinyl acetate copolymer, terpene resin, polycarbonate propylene ester, branched polyethylene, etc., and the thickness of the lower surface layer is 2 - 3 um.
[0009] In some embodiments, the lower surface layer includes the following components in parts by weight: 86 - 93 parts of ethylene-vinyl acetate copolymer, 3 - 6 parts of terpene resin, 2 - 4.5 parts of polycarbonate propylene ester, and 2 - 3.5 parts of branched polyethylene, wherein the melt index of the polycarbonate propylene ester is 3 - 6 g / 10 min.
[0010] In some embodiments, the thickness of the upper surface layer is 1 - 1.5 um, and the upper surface layer includes the following components in parts by weight: 90 - 99 parts of homopolypropylene and 1 - 10 parts of anti-blocking masterbatch.
[0011] In some embodiments, the anti-blocking masterbatch comprises silicone oxide particles and isotactic polypropylene, wherein the mass of the silicone oxide accounts for 20-30% of the total mass of the anti-blocking masterbatch, and the particle size of the silicone oxide is 1-2 μm.
[0012] In some embodiments, the component of the upper surface layer is a matting masterbatch, and the thickness of the upper surface layer using the matting masterbatch is 2-4 μm. The matting masterbatch is a blend of 30 parts by weight of polypropylene and 70 parts by weight of polyethylene.
[0013] Another aspect of the embodiments of the present disclosure provides a preparation process for a highly sticky BOPP adhesive-free film for preparing the BOPP adhesive-free film described in any one of the above. The preparation process comprises the following steps:
[0014] S101, Using a multi-layer co-extrusion biaxially oriented BOPP production line, after the production line is started and reaches the predetermined processing temperature conditions, the raw materials are pre-mixed according to the formula design requirements in sequence and then put into the corresponding extruder feeding system.
[0015] S102, After the extruder plasticizes to form a uniform melt, it is filtered through a filter and then transported to a T-die head for co-extrusion, and then through a casting and cooling unit to form a thick sheet. Among them, the outlet temperature of the first auxiliary extruder 1 for the upper surface layer 1 is 240-245 °C, the outlet temperature of the main extruder for the core layer 2 is 235-240 °C, the outlet temperature of the second auxiliary extruder for the adhesive functional layer 3 is 225-230 °C. In addition, the melt pipe temperature is 235-240 °C and the die head temperature is 235-240 °C. The temperature of the cooling and casting unit is controlled at 18 °C - 40 °C, the air knife air volume is 30 Bar, and the air knife angle is 80°.
[0016] S103, The thick sheet formed in step S102 is subjected to a biaxial stretching process through a longitudinal stretching device and a transverse stretching device in sequence to generate the film body. Among them, the preheating temperature is 180 °C, the preheating time is 8-10 min, the stretching ratio of the longitudinal stretching device is 4-5.5, and the stretching ratio of the transverse stretching device is 4.5-6.
[0017] The highly sticky BOPP adhesive-free film prepared by the embodiments of the present disclosure has a higher heat-sealing strength and higher adhesiveness compared with the existing coated films. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present disclosure. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0019] Figure 1 This is a schematic structural diagram of the high-viscosity BOPP non-adhesive film in the embodiments of the present disclosure. Detailed implementation manners
[0020] Reference is made herein to the various aspects and features of the present disclosure with reference to the accompanying drawings.
[0021] It should be understood that various modifications can be made to the embodiments claimed herein. Therefore, the above description should not be regarded as limiting, but merely as exemplifications of the embodiments. Those skilled in the art will envision other modifications within the scope and spirit of the present disclosure.
[0022] The accompanying drawings, which are included in and constitute a part of this specification, illustrate embodiments of the present disclosure and, together with the general description of the present disclosure given above and the detailed description of the embodiments given below, serve to explain the principles of the present disclosure.
[0023] These and other features of the present disclosure will become apparent from the following description of the preferred forms of the embodiments, given by way of non-limiting example with reference to the accompanying drawings.
[0024] It should also be understood that, although the present disclosure has been described with reference to some specific examples, those skilled in the art can surely implement many other equivalent forms of the present disclosure, which have the features as claimed and thus are all within the protection scope defined thereby.
[0025] When combined with the accompanying drawings, the above and other aspects, features, and advantages of the present disclosure will become more apparent in view of the following detailed description.
[0026] Specific embodiments of the present disclosure are hereinafter described with reference to the accompanying drawings; however, it should be understood that the claimed embodiments are merely examples of the present disclosure and can be implemented in various ways. Well-known and / or repetitive functions and structures are not described in detail to avoid obscuring the present disclosure with unnecessary or redundant details. Therefore, the specific structural and functional details claimed herein are not intended to be limiting, but merely serve as a basis for the claims and a representative basis for teaching those skilled in the art to implement substantially any combination.
[0027] The embodiments of the present disclosure provide a high-viscosity BOPP non-adhesive film, which includes a film body. The film body is a multi-layer co-extrusion structure, and the thickness of the film body here is 15 - 20 μm. Specifically, as Figure 1 shown, the film body includes an upper surface layer 1, a core layer 2, and a lower surface layer 3 that can directly adhere to paper. Among them, the upper surface layer 1 is a polyolefin layer, the core layer 2 is a polypropylene layer, and the lower surface layer 3 is an adhesive functional layer.
[0028] Further, the upper surface layer 1 comprises components in the following weight ratio: 90-99 parts of homopolypropylene and 1-10 parts of anti-blocking masterbatch, and the thickness of the upper surface layer 1 here is 1-1.5 μm.
[0029] Further, the anti-blocking masterbatch is composed of organosiloxane particles and isotactic polypropylene, wherein the mass of the siloxane accounts for 20-30% of the total mass of the anti-blocking masterbatch, and the particle size of the siloxane is 1-2 μm.
[0030] The component of the upper surface layer 1 is a matting masterbatch, and the thickness of the upper surface layer 1 using the matting masterbatch is 2-4 μm; wherein, the matting masterbatch is a blend of 30 parts by weight of polypropylene and 70 parts by weight of polyethylene.
[0031] Further, the core layer 2 comprises components in the following weight ratio: 90-99 parts of random copolymer polypropylene, 1-10 parts of antistatic masterbatch; the thickness of the core layer 2 here is 12-17 μm.
[0032] Preferably, the antistatic masterbatch comprises 75-85 parts by weight of isotactic homopolypropylene and 15-25 parts by weight of a migrating antistatic agent, and the components of the migrating antistatic agent include 60 parts by weight of polypropylene, 20 parts by weight of ethoxyamine, and 20 parts by weight of glycerol monostearate.
[0033] Further, the lower surface layer 3 is composed of one or more of ethylene-vinyl acetate copolymer, terpene resin, poly(propylene carbonate), branched polyethylene, etc., and the thickness of the lower surface layer 3 here is 2-3 μm. Through the lower surface layer 3, the high-viscosity BOPP non-adhesive film has a high viscosity, so that it can be easily adhered to other objects without using substances such as glue.
[0034] Preferably, the lower surface layer 3 comprises components in the following weight ratio: 86-93 parts of ethylene-vinyl acetate copolymer, 3-6 parts of terpene resin, 2-4.5 parts of poly(propylene carbonate), 2-3.5 parts of branched polyethylene, wherein the melt index of the poly(propylene carbonate) is 3-6 g / 10 min.
[0035] In a specific embodiment, the high-viscosity BOPP adhesive-free film comprises an upper surface layer 1, a core layer 2 and a lower surface layer 3. Among them, the upper surface layer 1 specifically comprises 99 parts of random copolymerized polypropylene and 1 part of anti-blocking masterbatch; among them, the mass of silicone in the anti-blocking masterbatch accounts for 20% of the total mass of the anti-sticking masterbatch; the core layer 2 specifically comprises the following components in parts by weight: 99 parts of random copolymerized polypropylene and 1 part of antistatic masterbatch, among which, the antistatic masterbatch comprises 75 parts by weight of isotactic homopolypropylene and 25 parts by weight of migrating antistatic agent; the lower surface layer 3 comprises: 93 parts of ethylene-vinyl acetate copolymer, 3 parts of terpene resin, 2 parts of polycarbonate propylene and 2 parts of branched polyethylene.
[0036] In another specific embodiment, the high-viscosity BOPP adhesive-free film comprises an upper surface layer 1, a core layer 2 and a lower surface layer 3. Among them, the upper surface layer 1 specifically comprises 90 parts of random copolymerized polypropylene and 10 parts of anti-blocking masterbatch; among them, the mass of silicone in the anti-blocking masterbatch accounts for 30% of the total mass of the anti-sticking masterbatch; the core layer 2 specifically comprises the following components in parts by weight: 99 parts of random copolymerized polypropylene and 1 part of antistatic masterbatch, among which, the antistatic masterbatch comprises 85 parts by weight of isotactic homopolypropylene and 15 parts by weight of migrating antistatic agent; the lower surface layer 3 comprises: 86 parts of ethylene-vinyl acetate copolymer, 6 parts of terpene resin, 4.5 parts of polycarbonate propylene and 3.5 parts of branched polyethylene.
[0037] The high-viscosity BOPP adhesive-free film prepared in the embodiments of the present disclosure has relatively high heat-sealing strength and relatively high viscosity compared with the existing coated films.
[0038] The second embodiment of the present disclosure provides a preparation process for a high-viscosity BOPP adhesive-free film, which is used to prepare the BOPP adhesive-free film in the above embodiments. The preparation process comprises the following steps:
[0039] S101, adopting a multi-layer co-extrusion biaxially oriented BOPP production line. After the production line is started and reaches the predetermined processing temperature condition, the raw materials are pre-mixed according to the formula design requirements and then put into the corresponding extruder feeding system.
[0040] S102, after the extruder is plasticized to form a uniform melt, it is filtered through a filter and then transported to a T-die head for co-extrusion, and then through a casting and cooling unit to form a thick sheet. Among them, the outlet temperature of the first auxiliary extruder 1 for the upper surface layer 1 is 240-245 °C, the outlet temperature of the main extruder for the core layer 2 is 235-240 °C, the outlet temperature of the second auxiliary extruder for the lower surface layer 3 is 225-230 °C. In addition, the melt pipeline temperature is 235-240 °C and the die head temperature is 235-240 °C. The temperature of the cooling and casting unit is controlled at 18 °C - 40 °C, the air knife air volume is 30 Bar, and the air knife angle is 80°.
[0041] In step S103, the thick sheet formed in step S102 is successively subjected to a biaxial stretching process by a machine direction orientation (MDO) device and a transverse direction orientation (TDO) device to generate the film body, wherein the upper region is the upper surface layer and the lower region is the lower surface, i.e., the adhesive functional layer.
[0042] In this step, the preheating temperature is 180 °C, the preheating time is 8 - 10 min, the draw ratio of the machine direction orientation device is 4 - 5.5, and the draw ratio of the transverse direction orientation device is 4.5 - 6.
[0043] The comparison of the heat seal strength of the adhesive - free film prepared based on this embodiment with that of the commercially available adhesive - free film and the peel strength after laminating paper is as follows:
[0044]
[0045] The high - tack BOPP adhesive - free film prepared in the embodiments of the present disclosure has relatively high heat seal strength and relatively high tack compared with the existing coated films.
[0046] In addition, the features of the embodiments shown in the drawings of the present application or various embodiments mentioned in this specification do not have to be understood as independent embodiments of each other. Instead, each feature described in one example of an embodiment can be combined with one or more other desired features from other embodiments, thereby generating other embodiments not described in words or with reference to the drawings.
[0047] The above - described embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.
Claims
1. A high-viscosity BOPP non-adhesive film, characterized in that: It comprises a film body, which is a multi-layer co-extruded structure with a thickness of 15-20um. The film body comprises an upper surface layer, a core layer and a lower surface layer. The upper surface layer is a polyolefin layer, the core layer is a polypropylene layer, and the lower surface layer is an adhesive functional layer.
2. The high-viscosity BOPP non-adhesive film according to claim 1, characterized in that: The thickness of the core layer is 12-17 um, and the core layer comprises the following components in the following weight proportions: 90-99 parts of random copolymer polypropylene and 1-10 parts of antistatic masterbatch.
3. The high-viscosity BOPP non-adhesive film according to claim 2, characterized in that: The antistatic masterbatch comprises 75 to 85 parts by weight of isotactic homopolypropylene and 15 to 25 parts by weight of a migratory antistatic agent.
4. The high-viscosity BOPP non-adhesive film according to claim 3, characterized in that: The migratory antistatic agent component includes 60 parts by weight of polypropylene, 20 parts by weight of ethoxylated amine and 20 parts by weight of glycerol monostearate.
5. The high-viscosity BOPP non-adhesive film according to claim 1, characterized in that: The lower surface layer is composed of one or more of ethylene-vinyl acetate copolymer, terpene resin, polycarbonate propylene, branched polyethylene and the like, and the thickness of the lower surface layer is 2 to 3 um.
6. The high-viscosity BOPP non-adhesive film according to claim 5, characterized in that: The lower surface layer comprises the following components in proportion by weight: 86-93 parts of ethylene-vinyl acetate copolymer, 3-6 parts of terpene resin, 2-4.5 parts of polycarbonate propylene, and 2-3.5 parts of branched polyethylene, wherein the polycarbonate propylene has a melt index of 3-6 g / 10 min.
7. The high-viscosity BOPP non-adhesive film according to claim 1, characterized in that: The thickness of the upper surface layer is 1-1.5 um, and the upper surface layer comprises the following components in the following weight proportions: 90-99 parts of homopolymer polypropylene and 1-10 parts of anti-adhesion masterbatch.
8. The high-viscosity BOPP non-adhesive film according to claim 7, characterized in that: The anti-adhesive masterbatch comprises organic siloxane particles and isotactic polypropylene, wherein the mass of siloxane accounts for 20-30% of the total mass of the anti-adhesive masterbatch, and the particle size of the siloxane is 1-2 μm.
9. The high-viscosity BOPP non-adhesive film according to claim 7, characterized in that: The component of the upper surface layer is a matte masterbatch. The thickness of the upper surface layer using the matte masterbatch is 2-4 um. The matte masterbatch is a blend of 30 parts by weight of polypropylene and 70 parts by weight of polyethylene.
10. A process for preparing a high-viscosity BOPP non-adhesive film, characterized in that: For preparing the BOPP non-adhesive film according to any one of claims 1 to 9, the preparation process comprises the following steps: S101, using a multi-layer co-extrusion biaxially oriented BOPP production line, after the production line is started and reaches the predetermined processing temperature conditions, the raw materials are pre-mixed in accordance with the formula design requirements and then fed into the corresponding extruder feeding system; S102, after plasticization by the extruder, a uniform melt is formed, which is filtered through a filter and then transported to a T-die for co-extrusion, and then cooled by a casting unit to form a thick sheet; wherein the outlet temperature of the first auxiliary extruder 1 for the upper surface layer 1 is 240-245°C, the outlet temperature of the main extruder for the core layer 2 is 235-240°C, and the outlet temperature of the second auxiliary extruder for the bonding functional layer 3 is 225-230°C, in addition, the melt pipe temperature is 235-240°C and the die temperature is 235-240°C, the cooling casting unit temperature is controlled at 18°C-40°C, the air knife air volume is 30Bar, and the air knife angle is 80°; S103, the thick sheet formed in step S102 is sequentially subjected to a biaxial stretching process by a longitudinal stretching device and a transverse stretching device to generate the film body, wherein the preheating temperature is 180°C, the preheating time is 8-10 minutes, the stretching ratio of the longitudinal stretching device is 4-5.5, and the stretching ratio of the transverse stretching device is 4.5-6.