A biodegradable anti-stick film and its preparation method
By using materials such as polyadipate and polylactic acid and compatibilizers to prepare biodegradable anti-stick membranes, the environmental pollution problem of non-degradable isolation membranes is solved. The membranes decompose into carbon dioxide and water in the natural environment and have good mechanical properties and construction adaptability, thus meeting the green upgrading needs of the building waterproofing field.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- UPASS MATERIAL TECH JIANGSU
- Filing Date
- 2026-04-17
- Publication Date
- 2026-06-02
AI Technical Summary
The non-degradable release membrane of existing bitumen-based waterproof membranes is difficult to recycle after construction, and long-term residues in the environment lead to microplastic pollution. In addition, existing biodegradable release membranes have problems such as poor barrier performance, insufficient mechanical strength or excessive cost, making it difficult to meet actual needs.
A biodegradable anti-stick film is prepared by using materials such as polyadipate, polylactic acid, and polybutylene butyrate as the main components, adding compatibilizers and dual-anti-adhesive masterbatch, and preparing the film by screw extrusion granulation and casting. A UV-curable release coating is then applied to the surface layer to improve compatibility and mechanical properties.
It enables the biodegradable anti-stick membrane to gradually decompose into carbon dioxide and water in the natural environment, solving the environmental pollution problem. At the same time, it has good mechanical properties and construction adaptability, meeting the green upgrade needs of the building waterproofing field.
Smart Images
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Abstract
Description
Technical Field
[0001] This invention relates to the field of building waterproof membrane technology, and in particular to a biodegradable anti-stick membrane and its preparation method. Background Technology
[0002] Asphalt-based waterproof membranes, with their excellent waterproof and seepage-proof performance, good mechanical strength, and cost-effectiveness, are widely used in various waterproofing scenarios such as building roofs, basements, municipal engineering, bridges, and tunnels, making them an indispensable core material in modern waterproofing projects. During the production and construction of asphalt-based waterproof membranes, the release liner plays a crucial role. Its main function is to prevent the membrane from self-adheding during production, storage, transportation, and construction, protect the integrity of the membrane's surface structure, ensure smooth laying and overlapping of the membrane during construction, and guarantee the construction quality and efficiency of the waterproofing project.
[0003] Currently, traditional bitumen-based waterproof membranes in the industry generally use non-degradable polymers such as polyethylene terephthalate (PET), polyethylene (PE), and polypropylene (PP) as the base material for the release liner. These materials have long been the mainstream choice due to their good temperature resistance, weather resistance, and ease of processing. However, these non-degradable release liners have a significant environmental drawback: after the waterproof membrane is laid, the release liner has completed its function and must be completely removed to achieve effective adhesion between the membrane and the substrate, and between membrane layers, ensuring the integrity of the waterproof system.
[0004] Due to the complexity of construction sites, the removed isolation membranes are easily scattered throughout the site, making complete recycling difficult. Ultimately, most are landfilled along with construction waste, becoming a significant source of solid waste pollution. More importantly, non-degradable polymers such as PET, PE, and PP have stable chemical structures and strong chemical inertness, making them difficult for microorganisms to decompose in the natural environment. Their degradation cycle can take hundreds of years or even longer, leaving them persistent in the environment for extended periods.
[0005] These long-term residual waste plastic film, under the long-term effects of natural environmental factors such as wind, sun, and rain, will gradually age and become brittle, eventually breaking down into microplastic particles with a diameter of less than 5 mm, which then enter the ecological environment such as soil and water. In the soil environment, microplastics will disrupt the soil aggregate structure, change the soil bulk density, pore size distribution, and hydraulic conductivity, reduce soil permeability and water and fertilizer retention capacity, hinder the normal growth of plant roots and nutrient absorption, and long-term accumulation will lead to a continuous decline in soil fertility and damage the stability of the soil ecosystem.
[0006] More seriously, microplastics in the soil can be absorbed by plant roots and transferred to the above-ground parts of the plant. They can also be ingested by soil animals such as earthworms and snails, and thus accumulate through the food chain, eventually potentially entering the human body and posing a potential threat to human health. Furthermore, during the crushing process of discarded protective membranes, additives such as flame retardants and plasticizers contained within them are continuously released into the soil, affecting the reproduction and development of soil organisms. Due to their strong hydrophobicity and large specific surface area, microplastics can also act as carriers of harmful substances such as heavy metals and organic pollutants, migrating and spreading with the soil, producing a complex pollution effect and further exacerbating the damage to the ecological environment.
[0007] Furthermore, while there are some attempts at biodegradable release liner technology in the market, most suffer from poor barrier properties, insufficient mechanical strength, mismatch between degradation rate and construction cycle, or excessively high costs. These limitations make it difficult to meet the actual needs of asphalt-based waterproof membrane production and construction, hindering large-scale application and failing to fundamentally solve the environmental problems caused by traditional non-degradable release liner technology. With the deepening of global green environmental protection concepts and the advancement of related environmental policies, developing new release liner technology that can replace traditional non-degradable release liner technology while balancing construction performance and environmental friendliness has become a pressing technical challenge for the asphalt-based waterproof membrane industry and an inevitable trend for promoting the industry's green and sustainable development. Summary of the Invention
[0008] The purpose of this invention is to address the shortcomings of existing technologies by providing a biodegradable anti-stick film and its preparation method, thereby solving problems such as poor pattern effects, inability to adapt to different base films, and low coefficient of friction in related technologies.
[0009] To achieve the above objectives, the technical solution adopted by the present invention is as follows: In a first aspect, a biodegradable anti-stick film is provided, comprising: The top layer comprises polyadipate, polylactic acid, polybutylene butyrate, compatibilizer, chain extender, and dual-resistance masterbatch; The middle layer is located on one side of the top layer and includes polyadipate, polyglycolic acid, polybutylene butyrate, compatibilizer, chain extender and anti-inflammatory masterbatch; The bottom layer is located on the side of the middle layer away from the top layer. The bottom layer includes polyadipic acid, polylactic acid, polybutylene butyrate, compatibilizer, chain extender and double-antibiotic masterbatch. The biodegradable anti-stick film has a thickness of 0.025~0.04 mm, a width of 960~1300 mm, and a corona value of ≥38 dny for the bottom layer.
[0010] In some of these embodiments, the compatibilizer is a polyolefin elastomer grafted with glycidyl methacrylate.
[0011] In some of these embodiments, the dual-resistance masterbatch is a polyadipate-carrier dual-resistance masterbatch.
[0012] In some of the embodiments, the chain extender is a random copolymer of styrene-glycidyl methacrylate.
[0013] In some of these embodiments, the top layer comprises, by weight percentage, 15%–30% polyadipate, 15%–25% polylactic acid, 40%–60% polybutylene butyrate, 1%–3% compatibilizer, 0.5%–1.5% chain extender, and 1%–2% double-antibiotic masterbatch; The middle layer includes 15%–30% polyadipate, 20%–35% polyglycolic acid, 40%–60% polybutylene butyrate, 1%–3% compatibilizer, 0.5%–1.5% chain extender, and 1%–2% double-antibiotic masterbatch; The base layer consists of 15%–30% polyadipate, 15%–25% polylactic acid, 40%–60% polybutylene butyrate, 1%–3% compatibilizer, 0.5%–1.5% chain extender, and 1%–2% double-antibiotic masterbatch.
[0014] In some of these embodiments, it also includes: A release layer is disposed on the side of the surface layer away from the middle layer, and the release layer includes a lightly release silicone acrylate, a tightly release silicone acrylate, a photoinitiator, and an anchoring agent.
[0015] In some of these embodiments, the photoinitiator is an organosilicon photoinitiator.
[0016] In some of these embodiments, the anchoring agent is a silane-based anchoring agent.
[0017] In some of these embodiments, the release layer comprises, by weight percentage, 80%–90% light-release silicone acrylate, 10%–20% tight-release silicone acrylate, 1%–2% photoinitiator, and 0.2%–1% anchoring agent.
[0018] In a second aspect, a method for preparing a biodegradable anti-stick film is provided, for preparing the biodegradable anti-stick film as described in the first aspect, comprising: Raw material mixing: The raw materials for the top layer, middle layer, and bottom layer are thoroughly mixed separately to obtain the top layer mixture, middle layer mixture, and bottom layer mixture, respectively. Screw extrusion granulation: The surface mixture, middle mixture, and bottom mixture are extruded and granulated separately to obtain surface masterbatch, middle masterbatch, and bottom masterbatch, respectively. Casting: The top layer masterbatch, middle layer masterbatch and bottom layer masterbatch are cast to obtain a biodegradable anti-stick film.
[0019] In some of these embodiments, during screw extrusion granulation: The extrusion temperature of the surface layer is 130~190℃, and the rotation speed is 200~350 rpm; The extrusion temperature of the middle layer is 150~230℃, and the rotation speed is 200~350 rpm; The extrusion temperature of the bottom layer is 130~190℃, and the rotation speed is 200~350 rpm.
[0020] In some of these embodiments, during screw extrusion granulation: The particle size of the surface layer masterbatch is 2~3 mm; The particle size of the intermediate layer masterbatch is 2~3 mm; The particle size of the bottom masterbatch is 2~3 mm.
[0021] In some of these embodiments, during the casting process: The extrusion temperature of the surface layer is 170~185℃, the rotation speed is 40~60 rpm, and the melt pressure is 10~20 MPa; The extrusion temperature of the middle layer is 180~210℃, the rotation speed is 30~50 rpm, and the melt pressure is 12~20 MPa; The extrusion temperature of the bottom layer is 170~185℃, the rotation speed is 40~60 rpm, and the melt pressure is 10~20 MPa.
[0022] In some of these embodiments, it also includes: Coating: Applying release coating to the surface layer to form a release layer.
[0023] In some of these embodiments, during coating: The coating amount is 0.5~1.2 g / m². 2 .
[0024] The present invention adopts the above technical solution and has the following technical effects compared with the prior art: 1) Add compatibilizers to the components of each layer to improve the compatibility of the raw materials, thereby reducing the brittleness of the biodegradable anti-stick film; 2) Adding PBAT carrier-based dual-antibiotic masterbatch to each layer delays degradation, extends service life, and ensures smooth processing of anti-sticking film; 3) By adjusting the blending ratio of each layer of components, the mechanical properties, processing fluidity, and biodegradability of the biodegradable anti-stick film are improved; 4) Apply a UV-cured release coating to the surface layer to ensure the construction and operation requirements of the biodegradable anti-stick film; 5) The biodegradable anti-stick membrane of the present invention is gradually decomposed into carbon dioxide and water by microorganisms in the natural environment, solving the environmental pollution problem of traditional isolation membranes from the source and providing an ideal material solution for the green upgrading of the building waterproofing field. Detailed Implementation
[0025] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.
[0026] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.
[0027] The present invention will be further described below with reference to specific embodiments, but these are not intended to limit the scope of the invention.
[0028] Example 1 This embodiment relates to the biodegradable anti-stick film of the present invention and its preparation method.
[0029] An illustrative embodiment of the present invention provides a biodegradable anti-stick film, comprising a top layer, a middle layer, and a bottom layer disposed sequentially. The components of each layer are as follows: Top layer: 15%–30% polyadipate (PBAT), 15%–25% polylactic acid (PLA), 40%–60% polybutylene butyrate (PBS), 1%–3% compatibilizer, 0.5%–1.5% chain extender, 1%–2% double-antibiotic masterbatch; Middle layer: 15%–30% poly(di ...(di((i((i((i((["[[I("["I(I([[I((["I(["I(I(I([[I((["I([[I(["I(I([[I(["I(I(I([[I(["I(I([[I(["I(I(I([[I(["I(I(I([[I(["I(I(I([[I(["I(I(I([[I(["I(I(I([[I(["I(I(I( Bottom layer: 15%–30% polyadipate (PBAT), 15%–25% polylactic acid (PLA), 40%–60% polybutylene butyrate (PBS), 1%–3% compatibilizer, 0.5%–1.5% chain extender, 1%–2% dual-antibiotic masterbatch.
[0030] It should be noted that the biodegradable anti-stick film of the present invention has a thickness of 0.025~0.04 mm, a width of 960~1300 mm, and a corona value of ≥38 dny for the bottom layer.
[0031] The compatibilizer is a polyolefin elastomer grafted with glycidyl methacrylate (POE-g-GMA).
[0032] The dual-resistance masterbatch is a polyadipic acid-carrier dual-resistance masterbatch. Its functions are UV resistance and oxidation resistance.
[0033] The chain extender is a random copolymer of styrene-glycidyl methacrylate.
[0034] Furthermore, the biodegradable anti-stick film also includes a release layer. The release layer is located on the side of the surface layer away from the middle layer. The composition of the release layer is as follows: 80%–90% lightly peelable silicone acrylate, 10%–20% tightly peelable silicone acrylate, 1%–2% photoinitiator and 0.2%–1% anchoring agent.
[0035] Among them, the photoinitiator is an organosilicon photoinitiator, including but not limited to organosilicon photoinitiator A81.
[0036] The anchoring agent is a silane-based anchoring agent, including but not limited to anchoring agent 297.
[0037] It should be noted that in existing technologies, release layers are generally produced using a thermosetting process with solvent-based silicone oil as the main component. This process can easily lead to significant film shrinkage, film surface curling and wrinkling during production, poor solvent safety, and environmental pollution. However, this invention uses solvent-free silicone oil and a UV irradiation process, resulting in a pollution-free film with excellent performance, a smooth appearance, and no shrinkage or wrinkles.
[0038] The preparation method of the biodegradable anti-stick film as described above is as follows: S1. Raw material mixing: The raw materials for the top layer, the middle layer, and the bottom layer are thoroughly mixed to obtain the top layer mixture, the middle layer mixture, and the bottom layer mixture, respectively. S2. Screw extrusion granulation: The surface mixture, middle mixture, and bottom mixture are extruded and granulated separately to obtain surface masterbatch, middle masterbatch, and bottom masterbatch, respectively. S3. Casting: The top layer masterbatch, middle layer masterbatch, and bottom layer masterbatch are cast to obtain a biodegradable anti-stick film.
[0039] In step S1, the mixing process of the surface layer is as follows: Step S11a, Raw material pretreatment: Vacuum drying of PBAT, PLA, and PBS; Step S12a, Premixing: Mix the vacuum-dried PBAT, PLA, PBS, compatibilizer, chain extender, and dual-antibiotic masterbatch.
[0040] In step S11a, the vacuum drying conditions are: drying at 60~100℃ for 4~6 h.
[0041] It should be noted that after vacuum drying, the moisture content of PBAT, PLA, and PBS is ≤0.05%.
[0042] In step S12a, the mixing conditions are: mixing at 1000~1500 rpm for 3~5 min.
[0043] It should be noted that the purpose of premixing is to ensure that the compatibilizer, chain extender, and dual-resistance masterbatch are evenly dispersed.
[0044] In step S1, the mixing process of the middle layer is as follows: Step S11b, Raw material pretreatment: Vacuum dry PBAT, PGA, and PBS; Step S12b, Premixing: Mix the vacuum-dried PBAT, PGA, PBS, compatibilizer, chain extender, and dual-antibiotic masterbatch.
[0045] In step S11b, the vacuum drying conditions are as follows: PBAT and PBS are dried at 60~100℃ for 4~6 h, and PGA is dried at 80~120℃ for 6~7 h.
[0046] It should be noted that after vacuum drying, the moisture content of PBAT, PGA, and PBS is ≤0.05%.
[0047] In step S12b, the mixing conditions are: mixing at 1000~1500 rpm for 3~5 min.
[0048] It should be noted that the purpose of premixing is to ensure that the compatibilizer, chain extender, and dual-resistance masterbatch are evenly dispersed.
[0049] In step S1, the mixing process of the underlying layer is as follows: Step S11c, Raw material pretreatment: Vacuum dry PBAT, PLA, and PBS; Step S12c, Premixing: Mix the vacuum-dried PBAT, PLA, PBS, compatibilizer, chain extender, and dual-antibiotic masterbatch.
[0050] In step S11c, the vacuum drying conditions are: drying at 60~100℃ for 4~6 hours.
[0051] It should be noted that after vacuum drying, the moisture content of PBAT, PLA, and PBS is ≤0.05%.
[0052] In step S12c, the mixing conditions are: mixing at 1000~1500 rpm for 3~5 min.
[0053] It should be noted that the purpose of premixing is to ensure that the compatibilizer, chain extender, and dual-resistance masterbatch are evenly dispersed.
[0054] In step S2, the screw extrusion process for the surface layer is as follows: In step S2, the screw extrusion process for the middle layer is as follows: In step S2, the screw extrusion process of the bottom layer is as follows: In step S3, the extrusion process of the surface layer is as follows: In step S3, the extrusion process of the middle layer is as follows: In step S3, the extrusion process of the bottom layer is as follows: In step S3, the casting process is as follows: Furthermore, the preparation method also includes: S4. Coating: Apply release coating to the surface layer to form a release layer.
[0055] In step S4, the coating process is as follows: The technical effects of this invention are as follows: 1) Add compatibilizers to the components of each layer to improve the compatibility of the raw materials, thereby reducing the brittleness of the biodegradable anti-stick film; 2) Adding PBAT carrier-based dual-antibiotic masterbatch to each layer delays degradation, extends service life, and ensures smooth processing of anti-sticking film; 3) By adjusting the blending ratio of each layer of components, the mechanical properties, processing fluidity, and biodegradability of the biodegradable anti-stick film are improved; 4) Apply a UV-cured release coating to the surface layer to ensure the construction and operation requirements of the biodegradable anti-stick film; 5) The biodegradable anti-stick membrane of the present invention is gradually decomposed into carbon dioxide and water by microorganisms in the natural environment, solving the environmental pollution problem of traditional isolation membranes from the source and providing an ideal material solution for the green upgrading of the building waterproofing field.
[0056] Example 2 This embodiment is a specific implementation of the present invention.
[0057] In this embodiment, the composition of the biodegradable anti-stick film is as follows: Top layer: 21.5% PBAT, 15% PLA, 60% PBS, 1.5% compatibilizer (POE-g-GMA, Jia Yi Rong SOG-03), 1% chain extender (Jia Yi Rong SG-20), 1% PBAT carrier dual-antibiotic masterbatch (Lanshan Tunhe TH-MB-001); Middle layer: 16% PBAT, 20% PGA, 60% PBS, 2% compatibilizer (POE-g-GMA, Jia Yi Rong SOG-03), 1% chain extender (Jia Yi Rong SG-20), 1% PBAT carrier dual-antibody masterbatch (Lanshan Tunhe TH-MB-001); Bottom layer: 21.5% PBAT, 15% PLA, 60% PBS, 1.5% compatibilizer (POE-g-GMA, Jia Yi Rong SOG-03), 1% chain extender (Jia Yi Rong SG-20), 1% PBAT carrier dual-antibiotic masterbatch (Lanshan Tunhe TH-MB-001); Release layer: 90% lightly release silicone acrylate (RC902), 10% tightly release silicone acrylate, 1% silicone photoinitiator (A81), 0.2% anchoring agent (anchoring agent 297).
[0058] In this embodiment, the preparation process of the biodegradable anti-stick film is as follows: S1. Raw material mixing: The raw materials for the top layer, the middle layer, and the bottom layer are thoroughly mixed to obtain the top layer mixture, the middle layer mixture, and the bottom layer mixture, respectively. S2. Screw extrusion granulation: The surface mixture, middle mixture, and bottom mixture are extruded and granulated separately to obtain surface masterbatch, middle masterbatch, and bottom masterbatch, respectively. S3, Casting: The top layer masterbatch, middle layer masterbatch and bottom layer masterbatch are cast to obtain a biodegradable anti-stick film; S4. Coating: Apply release coating to the surface layer to form a release layer.
[0059] In step S1, the mixing process is as follows: Top / bottom layer: PLA / PBAT / PBS: vacuum dried at 80℃ for 5 h, moisture content ≤0.05%; mixed at 1000-1500 rpm for 3-5 min using a high-speed mixer; Middle layer: PBAT / PBS: vacuum dried at 80℃ for 5 h, moisture content ≤0.05%; PGA: dried at 100℃ for 6~7 h, moisture content ≤0.05%; mixed at 1000-1500 rpm for 3-5 min using a high-speed mixer.
[0060] In step SS2, the screw extrusion process is as follows: Top layer / bottom layer: Middle layer: In step S3, the extrusion process is as follows: Top layer / bottom layer: Middle layer: In step S3, the casting process is as follows: In step S4, the coating process is as follows: The biodegradable anti-stick film (excluding release layer) prepared in this embodiment has a thickness of 0.025 mm, a width of 960 mm, and a bottom corona value ≥38 dny.
[0061] Example 3 This embodiment is a specific implementation of the present invention.
[0062] In this embodiment, the composition of the biodegradable anti-stick film is as follows: Top layer: 26% PBAT, 20% PLA, 50% PBS, 2% compatibilizer (POE-g-GMA, Jia Yi Rong SOG-03), 1% chain extender (Jia Yi Rong SG-20), 1% PBAT carrier dual-antibody masterbatch (Lanshan Tunhe TH-MB-001); Middle layer: 21% PBAT, 25% PGA, 50% PBS, 2% compatibilizer (POE-g-GMA, Jia Yi Rong SOG-03), 1% chain extender (Jia Yi Rong SG-20), 1% PBAT carrier dual-antibody masterbatch (Lanshan Tunhe TH-MB-001); Bottom layer: 26% PBAT, 20% PLA, 50% PBS, 2% compatibilizer (POE-g-GMA, Jia Yi Rong SOG-03), 1% chain extender (Jia Yi Rong SG-20), 1% PBAT carrier dual-antibiotic masterbatch (Lanshan Tunhe TH-MB-001); Release layer: 85% lightly release silicone acrylate (RC902), 15% tightly release silicone acrylate, 1% silicone photoinitiator (A81), 0.2% anchoring agent (anchoring agent 297).
[0063] In this embodiment, the preparation process of the biodegradable anti-stick film is as follows: S1. Raw material mixing: The raw materials for the top layer, the middle layer, and the bottom layer are thoroughly mixed to obtain the top layer mixture, the middle layer mixture, and the bottom layer mixture, respectively. S2. Screw extrusion granulation: The surface mixture, middle mixture, and bottom mixture are extruded and granulated separately to obtain surface masterbatch, middle masterbatch, and bottom masterbatch, respectively. S3, Casting: The top layer masterbatch, middle layer masterbatch and bottom layer masterbatch are cast to obtain a biodegradable anti-stick film; S4. Coating: Apply release coating to the surface layer to form a release layer.
[0064] In step S1, the mixing process is as follows: Top / bottom layer: PLA / PBAT / PBS: vacuum dried at 80℃ for 5 h, moisture content ≤0.05%; mixed at 1000-1500 rpm for 3-5 min using a high-speed mixer; Middle layer: PBAT / PBS: vacuum dried at 80℃ for 5 h, moisture content ≤0.05%; PGA: dried at 100℃ for 6~7 h, moisture content ≤0.05%; mixed at 1000-1500 rpm for 3-5 min using a high-speed mixer.
[0065] In step SS2, the screw extrusion process is as follows: Top layer / bottom layer: Middle layer: In step S3, the extrusion process is as follows: Top layer / bottom layer: Middle layer: In step S3, the casting process is as follows: In step S4, the coating process is as follows: The biodegradable anti-stick film (excluding release layer) prepared in this embodiment has a thickness of 0.03 mm, a width of 960 mm, and a bottom corona value ≥38 dny.
[0066] Example 4 This embodiment is a specific implementation of the present invention.
[0067] In this embodiment, the composition of the biodegradable anti-stick film is as follows: Top layer: 21% PBAT, 25% PLA, 50% PBS, 2% compatibilizer (POE-g-GMA, Jia Yi Rong SOG-03), 1% chain extender (Jia Yi Rong SG-20), 1% PBAT carrier dual-antibiotic masterbatch (Lanshan Tunhe TH-MB-001); Middle layer: 16% PBAT, 30% PGA, 50% PBS, 2% compatibilizer (POE-g-GMA, Jia Yi Rong SOG-03), 1% chain extender (Jia Yi Rong SG-20), 1% PBAT carrier dual-antibody masterbatch (Lanshan Tunhe TH-MB-001); Bottom layer: 21% PBAT, 25% PLA, 50% PBS, 2% compatibilizer (POE-g-GMA, Jia Yi Rong SOG-03), 1% chain extender (Jia Yi Rong SG-20), 1% PBAT carrier dual-antibiotic masterbatch (Lanshan Tunhe TH-MB-001); Release layer: 85% lightly release silicone acrylate (RC902), 15% tightly release silicone acrylate, 1% silicone photoinitiator (A81), 0.2% anchoring agent (anchoring agent 297).
[0068] In this embodiment, the preparation process of the biodegradable anti-stick film is as follows: S1. Raw material mixing: The raw materials for the top layer, the middle layer, and the bottom layer are thoroughly mixed to obtain the top layer mixture, the middle layer mixture, and the bottom layer mixture, respectively. S2. Screw extrusion granulation: The surface mixture, middle mixture, and bottom mixture are extruded and granulated separately to obtain surface masterbatch, middle masterbatch, and bottom masterbatch, respectively. S3, Casting: The top layer masterbatch, middle layer masterbatch and bottom layer masterbatch are cast to obtain a biodegradable anti-stick film; S4. Coating: Apply release coating to the surface layer to form a release layer.
[0069] In step S1, the mixing process is as follows: Top / bottom layer: PLA / PBAT / PBS: vacuum dried at 80℃ for 5 h, moisture content ≤0.05%; mixed at 1000-1500 rpm for 3-5 min using a high-speed mixer; Middle layer: PBAT / PBS: vacuum dried at 80℃ for 5 h, moisture content ≤0.05%; PGA: dried at 100℃ for 6~7 h, moisture content ≤0.05%; mixed at 1000-1500 rpm for 3-5 min using a high-speed mixer.
[0070] In step SS2, the screw extrusion process is as follows: Top layer / bottom layer: Middle layer: In step S3, the extrusion process is as follows: Top layer / bottom layer: Middle layer: In step S3, the casting process is as follows: In step S4, the coating process is as follows: The biodegradable anti-stick film (excluding release layer) prepared in this embodiment has a thickness of 0.035 mm, a width of 960 mm, and a bottom corona value ≥38 dny.
[0071] Example 5 This embodiment is a specific implementation of the present invention.
[0072] In this embodiment, the composition of the biodegradable anti-stick film is as follows: Top layer: 21% PBAT, 25% PLA, 50% PBS, 2% compatibilizer (POE-g-GMA, Jia Yi Rong SOG-03), 0.5% chain extender (Jia Yi Rong SG-20), 1.5% PBAT carrier dual-antibiotic masterbatch (Lanshan Tunhe TH-MB-001); Middle layer: 16% PBAT, 30% PGA, 50% PBS, 2% compatibilizer (POE-g-GMA, Jia Yi Rong SOG-03), 0.5% chain extender (Jia Yi Rong SG-20), 1.5% PBAT carrier dual-antibiotic masterbatch (Lanshan Tunhe TH-MB-001); Bottom layer: 21% PBAT, 25% PLA, 50% PBS, 2% compatibilizer (POE-g-GMA, Jia Yi Rong SOG-03), 0.5% chain extender (Jia Yi Rong SG-20), 1.5% PBAT carrier dual-antibiotic masterbatch (Lanshan Tunhe TH-MB-001); Release layer: 85% lightly release silicone acrylate (RC902), 15% tightly release silicone acrylate, 1% silicone photoinitiator (A81), 0.2% anchoring agent (anchoring agent 297).
[0073] In this embodiment, the preparation process of the biodegradable anti-stick film is as follows: S1. Raw material mixing: The raw materials for the top layer, the middle layer, and the bottom layer are thoroughly mixed to obtain the top layer mixture, the middle layer mixture, and the bottom layer mixture, respectively. S2. Screw extrusion granulation: The surface mixture, middle mixture, and bottom mixture are extruded and granulated separately to obtain surface masterbatch, middle masterbatch, and bottom masterbatch, respectively. S3, Casting: The top layer masterbatch, middle layer masterbatch and bottom layer masterbatch are cast to obtain a biodegradable anti-stick film; S4. Coating: Apply release coating to the surface layer to form a release layer.
[0074] In step S1, the mixing process is as follows: Top / bottom layer: PLA / PBAT / PBS: vacuum dried at 80℃ for 5 h, moisture content ≤0.05%; mixed at 1000-1500 rpm for 3-5 min using a high-speed mixer; Middle layer: PBAT / PBS: vacuum dried at 80℃ for 5 h, moisture content ≤0.05%; PGA: dried at 100℃ for 6~7 h, moisture content ≤0.05%; mixed at 1000-1500 rpm for 3-5 min using a high-speed mixer.
[0075] In step SS2, the screw extrusion process is as follows: Top layer / bottom layer: Middle layer: In step S3, the extrusion process is as follows: Top layer / bottom layer: Middle layer: In step S3, the casting process is as follows: In step S4, the coating process is as follows: The biodegradable anti-stick film (excluding release layer) prepared in this embodiment has a thickness of 0.035 mm, a width of 960 mm, and a bottom corona value ≥38 dny.
[0076] Example 6 This embodiment is a specific implementation of the present invention.
[0077] In this embodiment, the composition of the biodegradable anti-stick film is as follows: Top layer: 19% PBAT, 25% PLA, 50% PBS, 3% compatibilizer (POE-g-GMA, Jia Yi Rong SOG-03), 1.5% chain extender (Jia Yi Rong SG-20), 1.5% PBAT carrier dual-antibiotic masterbatch (Lanshan Tunhe TH-MB-001); Middle layer: 19.5% PBAT, 35% PGA, 40% PBS, 3% compatibilizer (POE-g-GMA, Jia Yi Rong SOG-03), 1.5% chain extender (Jia Yi Rong SG-20), 1.5% PBAT carrier dual antibiotic masterbatch (Lanshan Tunhe TH-MB-001); Bottom layer: 19% PBAT, 25% PLA, 50% PBS, 3% compatibilizer (POE-g-GMA, Jia Yi Rong SOG-03), 1.5% chain extender (Jia Yi Rong SG-20), 1.5% PBAT carrier dual-antibiotic masterbatch (Lanshan Tunhe TH-MB-001); Release layer: 80% lightly release silicone acrylate (RC902), 20% tightly release silicone acrylate, 1.5% silicone photoinitiator (A81), 0.2% anchoring agent (anchoring agent 297).
[0078] In this embodiment, the preparation process of the biodegradable anti-stick film is as follows: S1. Raw material mixing: The raw materials for the top layer, the middle layer, and the bottom layer are thoroughly mixed to obtain the top layer mixture, the middle layer mixture, and the bottom layer mixture, respectively. S2. Screw extrusion granulation: The surface mixture, middle mixture, and bottom mixture are extruded and granulated separately to obtain surface masterbatch, middle masterbatch, and bottom masterbatch, respectively. S3, Casting: The top layer masterbatch, middle layer masterbatch and bottom layer masterbatch are cast to obtain a biodegradable anti-stick film; S4. Coating: Apply release coating to the surface layer to form a release layer.
[0079] In step S1, the mixing process is as follows: Top / bottom layer: PLA / PBAT / PBS: vacuum dried at 80℃ for 5 h, moisture content ≤0.05%; mixed at 1000-1500 rpm for 3-5 min using a high-speed mixer; Middle layer: PBAT / PBS: vacuum dried at 80℃ for 5 h, moisture content ≤0.05%; PGA: dried at 100℃ for 6~7 h, moisture content ≤0.05%; mixed at 1000-1500 rpm for 3-5 min using a high-speed mixer.
[0080] In step SS2, the screw extrusion process is as follows: Top layer / bottom layer: Middle layer: In step S3, the extrusion process is as follows: Top layer / bottom layer: Middle layer: In step S3, the casting process is as follows: In step S4, the coating process is as follows: The biodegradable anti-stick film (excluding release layer) prepared in this embodiment has a thickness of 0.045 mm, a width of 960 mm, and a bottom corona value ≥38 dny.
[0081] Test case This test example examines the performance of the biodegradable anti-stick films prepared in Examples 2 through 6. The test results are shown in the table below.
[0082] As shown in the table above, the biodegradable anti-stick films prepared in Examples 2 to 6 of this invention meet all the performance requirements. Specifically, the longitudinal and transverse tensile strengths are both higher than the standard limits, and the elongation at break is excellent, demonstrating good mechanical properties. The residual adhesion rate on the release surface is ≥84%, and the peel force is ≤14 gf / 25 mm, indicating stable and reliable release performance. The longitudinal and transverse heat shrinkage rates are both controlled within 3%, showing good dimensional stability. The oxygen permeability is less than 350 μm. 3 / (m² 24h With a strength of 0.1 MPa, it exhibits excellent barrier properties; the relative biodegradability is ≥92%, meeting the requirements for full biodegradability. Overall, the prepared biodegradable anti-stick film achieves a good balance in mechanical properties, release properties, dimensional stability, barrier properties, and biodegradability, demonstrating excellent comprehensive performance and meeting the application requirements for biodegradable anti-stick films.
[0083] Comparative Example 1 This comparative example uses HDPE as the main material, with the addition of a certain proportion of degradable masterbatch and photo-oxidative degradation aids, and is produced by a three-layer co-extrusion blown film process. However, the film can only decompose into fragments and cannot be degraded.
[0084] Comparative Example 2 Compared to the present invention, the carrier of the added dual-resistance masterbatch in this comparative example is not a degradation masterbatch. The degradation rate of the final product is lower than that of the present invention.
[0085] Comparative Example 3 Compared to this invention, the comparative example did not include a compatibilizer, resulting in poor compatibility of the raw materials. The final film was highly brittle and unusable.
[0086] The above description is merely a preferred embodiment of the present invention and does not limit the implementation and protection scope of the present invention. Those skilled in the art should realize that any equivalent substitutions and obvious changes made using the present invention specification should be included within the protection scope of the present invention.
Claims
1. A biodegradable anti-stick film, characterized in that, include: The top layer comprises polyadipate, polylactic acid, polybutylene butyrate, compatibilizer, chain extender, and dual-resistance masterbatch; The middle layer is located on one side of the top layer and includes polyadipic acid, polyglycolic acid, polybutylene butyrate, compatibilizer, chain extender and anti-dual masterbatch; The bottom layer is located on the side of the middle layer away from the top layer. The bottom layer includes polyadipic acid, polylactic acid, polybutylene butyrate, compatibilizer, chain extender and double-antibiotic masterbatch. The biodegradable anti-stick film has a thickness of 0.025~0.04 mm, a width of 960~1300 mm, and a corona value of ≥38 dny for the bottom layer.
2. The biodegradable anti-stick film according to claim 1, characterized in that, The compatibilizer is a polyolefin elastomer grafted with glycidyl methacrylate; and / or The dual-resistance masterbatch is a polyadipate-carrier dual-resistance masterbatch; and / or The chain extender is a random copolymer of styrene and glycidyl methacrylate.
3. The biodegradable anti-stick film according to claim 1 or 2, characterized in that, By weight percentage, the top layer comprises 15%–30% polyadipate, 15%–25% polylactic acid, 40%–60% polybutylene butyrate, 1%–3% compatibilizer, 0.5%–1.5% chain extender and 1%–2% double-antibiotic masterbatch; The middle layer includes 15%–30% polyadipate, 20%–35% polyglycolic acid, 40%–60% polybutylene butyrate, 1%–3% compatibilizer, 0.5%–1.5% chain extender, and 1%–2% double-antibiotic masterbatch; The base layer consists of 15%–30% polyadipate, 15%–25% polylactic acid, 40%–60% polybutylene butyrate, 1%–3% compatibilizer, 0.5%–1.5% chain extender, and 1%–2% double-antibiotic masterbatch.
4. The biodegradable anti-stick film according to claim 1, characterized in that, Also includes: A release layer is disposed on the side of the surface layer away from the middle layer, and the release layer includes a lightly release silicone acrylate, a tightly release silicone acrylate, a photoinitiator, and an anchoring agent.
5. The biodegradable anti-stick film according to claim 4, characterized in that, The photoinitiator is an organosilicon photoinitiator; and / or The anchoring agent is a silane-based anchoring agent.
6. The biodegradable anti-stick film according to claim 4, characterized in that, By weight percentage, the release layer comprises 80%–90% light-release silicone acrylate, 10%–20% tight-release silicone acrylate, 1%–2% photoinitiator, and 0.2%–1% anchoring agent.
7. A method for preparing a biodegradable anti-stick film, used to prepare the biodegradable anti-stick film as described in any one of claims 1 to 6, characterized in that, include: Raw material mixing: The raw materials for the top layer, middle layer, and bottom layer are thoroughly mixed separately to obtain the top layer mixture, middle layer mixture, and bottom layer mixture, respectively. Screw extrusion granulation: The surface mixture, middle mixture, and bottom mixture are extruded and granulated separately to obtain surface masterbatch, middle masterbatch, and bottom masterbatch, respectively. Casting: The top layer masterbatch, middle layer masterbatch and bottom layer masterbatch are cast to obtain a biodegradable anti-stick film.
8. The preparation method according to claim 7, characterized in that, In screw extrusion granulation: The extrusion temperature of the surface layer is 130~190℃, and the rotation speed is 200~350 rpm; The extrusion temperature of the middle layer is 150~230℃, and the rotation speed is 200~350 rpm; The extrusion temperature of the bottom layer is 130~190℃, and the rotation speed is 200~350 rpm; and / or The particle size of the surface layer masterbatch is 2~3 mm; The particle size of the intermediate layer masterbatch is 2~3 mm; The particle size of the bottom masterbatch is 2~3 mm; and / or In tape casting: The extrusion temperature of the surface layer is 170~185℃, the rotation speed is 40~60 rpm, and the melt pressure is 10~20 MPa; The extrusion temperature of the middle layer is 180~210℃, the rotation speed is 30~50 rpm, and the melt pressure is 12~20 MPa; The extrusion temperature of the bottom layer is 170~185℃, the rotation speed is 40~60 rpm, and the melt pressure is 10~20 MPa.
9. The preparation method according to claim 7 or 8, characterized in that, Also includes: Coating: Applying release coating to the surface layer to form a release layer.
10. The preparation method according to claim 9, characterized in that, In coating: The coating amount is 0.5~1.2 g / m². 2 .