High-barrier BOPP film
By utilizing multi-layer composite structures and nanomaterials, the insufficient barrier performance and functional defects of BOPP film in demanding packaging scenarios have been resolved, achieving high-efficiency barrier properties, antistatic properties, UV protection, and slip properties, while improving mechanical properties, making it suitable for diverse packaging needs.
Patent Information
- Application Number
- CN202423061050.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-12
- Publication Date
- 2026-01-30
- Estimated Expiration
- 2034-12-12
AI Technical Summary
Existing BOPP films have insufficient barrier properties in demanding packaging scenarios, failing to effectively isolate oxygen and moisture. They also lack antistatic and UV protection functions and have poor slip properties, resulting in unstable mechanical properties in complex environments and making it difficult to meet diverse packaging needs.
It adopts a multi-layer composite structure, including a base layer, an adhesive layer, a barrier layer, a slip layer, an aluminum plating layer, an antistatic layer, and an ultraviolet absorption layer. The aluminum plating layer is formed by vacuum evaporation process, and nanomaterials are combined to improve the barrier performance and functionality. All layers are tightly bonded together.
It significantly improves the permeability of oxygen and water vapor, extends the shelf life of food and medicine, reduces the failure rate of electronic products, enhances antistatic and slip properties, and has stable mechanical properties, making it suitable for various packaging scenarios.
Smart Images
Figure CN223850179U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of film, especially a kind of high barrier BOPP film. BACKGROUND
[0002] Bidirectional stretch polypropylene (BOPP) film is widely used in packaging industry due to its light weight, transparency, good mechanical strength and other advantages.
[0003] However, the existing BOPP film has many shortcomings, which limits its application in high requirement packaging scenarios. The barrier performance is limited: the barrier ability of ordinary BOPP film to oxygen and water vapor is weak. In food packaging, oxygen can easily cause food oxidation and deterioration, and water vapor can cause food to be damp and moldy. In medicine packaging, it cannot effectively isolate the external environment, which shortens the effective period of the medicine. In electronic product packaging, moisture and oxygen can corrode electronic components, affecting product performance and service life. There is a lack of functional additional layer: most traditional BOPP films only have a single BOPP material layer, without considering the functional requirements of antistatic, ultraviolet protection, smoothness, etc. During processing, transportation and use, static electricity can easily accumulate on the surface of the film, attracting dust and impurities, which not only affects the appearance but also may contaminate the contents of the package. There is a lack of ultraviolet protection, and the contents of the package are easily aged and decomposed under light. Poor smoothness leads to high friction during winding, bag making and other processing steps, which can easily scratch and wrinkle the film, reducing production efficiency and product quality. The simple structure makes it lack of mechanical property stability in complex environment. Under high temperature and humidity conditions, the size is easy to change, the tensile strength is reduced, and the film is easy to brittle after long-term use, which cannot meet the diversified packaging process and long-term storage requirements.
[0004] Therefore, a high barrier BOPP film is proposed. UTILITY MODEL CONTENTS
[0005] The utility model aims to provide a kind of high barrier BOPP film, with fusion multilayer composite structure and multiple functional coating, greatly improve barrier performance, with antistatic, anti-UV and other multiple functions, mechanical property stable and reliable, expand BOPP film application category, meet the advantages of high-end packaging market demand.
[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a kind of high barrier BOPP film, including film body, the film body includes base layer, the upper surface of the base layer is sequentially provided with first adhesive layer, barrier layer and first smooth layer, the lower surface of the base layer is sequentially provided with second adhesive layer, aluminized layer and second smooth layer.
[0007] Preferably, the base layer is made of stretched polypropylene material, the thickness of the base layer is 15-30 μm, and the crystallinity is 35%-50%.
[0008] Preferably, the thickness of the first adhesive layer and the second adhesive layer is 1-3 microns, and both are made of polyurethane adhesive material.
[0009] Preferably, the thickness of the barrier layer is 5-15 microns, the ethylene content is 25%-40%, the thickness of the first and second slip layers is 0.5-1.5 microns, and both are made of silicone slip agent material.
[0010] Preferably, the thickness of the aluminum plating layer is 30-100 nm, and the aluminum plating layer is formed by vacuum evaporation process, which can significantly enhance the barrier effect of the film body to light and gas.
[0011] Preferably, the upper surface of the barrier layer is covered with an oxide coating made of nano-silicon dioxide material with a thickness of 0.2-1 micron, and an antistatic layer is provided between the oxide coating and the first slip layer, the thickness of the antistatic layer is 0.1-0.5 microns, and the antistatic layer is made of quaternary ammonium salt antistatic agent material.
[0012] Preferably, an ultraviolet absorbing layer is provided between the aluminum plating layer and the second slip layer, the thickness of the ultraviolet absorbing layer is 0.5-2 microns, the ultraviolet absorbing layer is made of benzotriazole ultraviolet absorber, and nano calcium carbonate particles are uniformly dispersed in the base layer, the particle size of the nano calcium carbonate particles is 50-200 nm, and the nano calcium carbonate particles account for 1%-5% of the mass of the base layer.
[0013] Preferably, the thickness of the film body is 25-50 microns, and the layers are tightly combined without delamination or blistering.
[0014] Compared with the prior art, the application has the following advantages:
[0015] 1. The application has super strong barrier property: the oxygen and water vapor transmission rates are reduced by 70%-80% compared with traditional BOPP film, effectively blocking external adverse factors, and the shelf life of food is extended by 3-5 times, and the effective period of medicine is extended by about 2-3 years (depending on the characteristics of the medicine), and the moisture and oxidation failure rate of electronic products is reduced by more than 80%;
[0016] 2. The application has multi-functional integration: the antistatic property controls the surface static voltage of the film body to be within 50V, effectively preventing dust; the ultraviolet barrier rate is more than 90%, slowing down the aging of the contents; the slip property makes the friction coefficient as low as 0.1-0.2, making the processing smooth, and the comprehensive performance is excellent;
[0017] 3. The application has excellent mechanical stability: the tensile strength is significantly improved, the longitudinal and transverse strength meets the stress demand of multi-element processing, the size change rate is less than 0.5% during long-term use, the mechanical property retention rate is more than 80% in high temperature 80℃ and high humidity 90% RH environment, the weather resistance is strong, and it is suitable for a wide range of packaging scenarios. BRIEF DESCRIPTION OF DRAWINGS
[0018] Fig. 1 The whole structure diagram of the high-barrier BOPP film of the present application;
[0019] Fig. 2 The composition schematic diagram of the film body of the present application.
[0020] In the figure, 1, film body; 2, base layer; 3, first adhesive layer; 4, barrier layer; 5, first slip layer; 6, second adhesive layer; 7, aluminum plating layer; 8, second slip layer. DETAILED DESCRIPTION
[0021] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.
[0022] Please refer to Figs. 1-2 The present application provides technical solutions:
[0023] The application discloses a high-barrier BOPP film which comprises a film body 1, wherein the upper surface of a base layer 2 is sequentially provided with a first adhesive layer 3, a barrier layer 4 and a first slip layer 5, the lower surface of the base layer 2 is sequentially provided with a second adhesive layer 6, an aluminum plating layer 7 and a second slip layer 8, the base layer 2 is made of a stretched polypropylene material, the thickness of the base layer 2 is 15-30 microns, the crystallinity thereof is 35%-50%, the base layer 2 has good mechanical strength and dimensional stability, the thickness of the first adhesive layer 3 and the second adhesive layer 6 is 1-3 microns, and the first adhesive layer 3 and the second adhesive layer 6 are both made of a polyurethane adhesive material, the first adhesive layer 3 is used for tightly bonding the base layer 2 and the barrier layer 4, the second adhesive layer 6 is used for stably bonding the base layer 2 and the aluminum plating layer 7, the thickness of the barrier layer 4 is 5-15 microns, the ethylene content of the barrier layer 4 is 25%-40%, the barrier layer 4 has excellent barrier properties for oxygen and water vapor, the thickness of the first slip layer 5 and the second slip layer 8 is 0.5-1.5 microns, and the first slip layer 5 and the second slip layer 8 are both made of an organic silicon slip agent material, the first slip layer 5 and the second slip layer 8 give the film body 1 good surface slip property, and facilitate subsequent processing and use, the thickness of the aluminum plating layer 7 is 30-100 nanometers, the aluminum plating layer 7 is formed through a vacuum evaporation process, and the barrier effect of the film body 1 on light and gas can be significantly enhanced, the upper surface of the barrier layer 4 is covered with an oxide coating, the oxide coating is made of nano silicon dioxide material and has a thickness of 0.2-1 micron, the coating can further improve the barrier capacity of the film body 1 for water vapor and gas molecules, and simultaneously enhance the surface wear resistance of the film body 1, an antistatic layer is arranged between the oxide coating and the first slip layer 5, the thickness of the antistatic layer is 0.1-0.5 micron, the antistatic layer is made of a quaternary ammonium salt antistatic agent material, can effectively eliminate the static electricity accumulation on the surface of the film body 1, prevents the film body 1 from being affected in performance and use effect due to static adsorption of dust and other impurities, an ultraviolet absorption layer is arranged between the aluminum plating layer 7 and the second slip layer 8, the thickness of the ultraviolet absorption layer is 0.5-2 microns, the ultraviolet absorption layer is composed of a benzotriazole ultraviolet absorber, can effectively absorb ultraviolet rays, prevents the film body 1 and the packaging contents from being aged and deteriorated due to ultraviolet irradiation, nano calcium carbonate particles are uniformly dispersed in the base layer 2, the particle size of the nano calcium carbonate particles is 50-200 nanometers, the nano calcium carbonate particles account for 1%-5% of the mass of the base layer 2, are used for enhancing the rigidity and heat resistance of the base layer 2, and simultaneously do not affect the transparency and flexibility of the film body 1, the thickness of the film body 1 is 25-50 microns, and the layers are tightly combined without delamination and blistering.
[0024] Working principle: in the use process, the base layer 2 guarantees the mechanical strength and dimensional stability of the film body 1, the first adhesive layer 3 is closely bonded with the barrier layer 4, the second adhesive layer 6 is firmly bonded with the aluminized layer 7, the barrier layer 4 blocks oxygen and water vapor, the first smooth layer 5 and the second smooth layer 8 give the film body 1 good surface smoothness, which is convenient for subsequent processing and use, the aluminized layer 7 formed by vacuum evaporation process makes the film body 1 block light and gas, the oxide coating can further improve the blocking ability of the film body 1 to water vapor and gas molecules, and at the same time enhance the surface wear resistance of the film body 1, the antistatic layer can effectively eliminate the static accumulation on the surface of the film body 1, prevent the film body 1 from being affected by static adsorption of dust and other impurities, and affect the performance and use effect, the ultraviolet absorption layer can effectively absorb ultraviolet rays, prevent the film body 1 and the packaging contents from aging and deteriorating due to ultraviolet irradiation, the nano calcium carbonate particles are used to enhance the rigidity and heat resistance of the base layer 2, and at the same time do not affect the transparency and flexibility of the film body 1, the thickness of the film body 1 is 25-50 μm, and the combination between each layer is tight, without delamination and blistering phenomenon.
[0025] The above is only the preferred embodiment of the present application, and is not used to limit the present application, any modification, equivalent replacement and improvement within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims
1. A high barrier BOPP film comprising a film body (1), characterized in that: The film body (1) comprises a base layer (2), the upper surface of the base layer (2) is sequentially provided with a first adhesive layer (3), a barrier layer (4) and a first slip layer (5), the lower surface of the base layer (2) is sequentially provided with a second adhesive layer (6), an aluminum plating layer (7) and a second slip layer (8).
2. A high barrier BOPP film as claimed in claim 1, wherein: The base layer (2) is made of stretched polypropylene material, the thickness of the base layer (2) is 15-30 microns, and the crystallinity is 35%-50%.
3. A high barrier BOPP film as claimed in claim 1, wherein: The thickness of the first adhesive layer (3) and the second adhesive layer (6) is 1-3 microns, and both are made of polyurethane adhesive material.
4. A high barrier BOPP film as claimed in claim 1, wherein: The thickness of the first slip layer (5) and the second slip layer (8) is 0.5-1.5 microns, and both are made of silicone slip agent material.
5. A high barrier BOPP film as claimed in claim 1, wherein: The thickness of the aluminum plating layer (7) is 30-100 nanometers, which is formed by vacuum evaporation process, and can significantly enhance the barrier effect of the film body (1) to light and gas.
6. A high barrier BOPP film as claimed in claim 1, wherein: The upper surface of the barrier layer (4) is covered with an oxide coating made of nano-silicon dioxide material with a thickness of 0.2-1 micron, and an antistatic layer with a thickness of 0.1-0.5 micron made of quaternary ammonium salt antistatic agent material is arranged between the oxide coating and the first slip layer (5).
7. A high barrier BOPP film as claimed in claim 1, wherein: An ultraviolet absorbing layer with a thickness of 0.5-2 microns composed of benzotriazole ultraviolet absorber is arranged between the aluminum plating layer (7) and the second slip layer (8).
8. A high barrier BOPP film as claimed in claim 1, wherein: The thickness of the film body (1) is 25-50 microns, and the layers are tightly combined without delamination and blistering.