High-barrier high-residual anti-sticking film, and preparation method and application thereof

Abstract

The application relates to the technical field of film materials, and particularly provides a high-barrier high-residual anti-adhesion film and a preparation method and application thereof. The high-barrier high-residual anti-adhesion film comprises a seven-layer co-extrusion film structure, and from top to bottom, the seven-layer co-extrusion film structure comprises A and B layers mainly composed of polypropylene and polyolefin, a C layer mainly composed of an olefin-olefin alcohol copolymer, a D layer mainly composed of nylon, an E layer mainly composed of polypropylene and polyolefin, and F and G layers mainly composed of polypropylene, polyolefin and color masterbatch; and the other side of the A layer of the anti-adhesion film is further coated with a silicon oil layer. By optimizing the component types and the use amount of each layer structure of the anti-adhesion film, the anti-adhesion film has excellent barrier properties, high-temperature resistance and very low silicon transfer amount; when the anti-adhesion film is used as a release film or a face film of a waterproof roll material, the anti-adhesion film can prevent the yellowing problem of the waterproof roll material modified bitumen glue after storage and packaging, and can keep the adhesion of the waterproof modified bitumen glue, thereby prolonging the storage period of the roll material to 1 year, and the product appearance is more flat, and there is no wrinkling or deformation phenomenon.

Description

Technical Field

[0001] This invention relates to the field of membrane materials technology, B32B27 / 32, and particularly to a high-barrier, high-residue anti-sticking membrane, its preparation method, and its application. Background Technology

[0002] In the production of waterproof membranes, high-temperature resistant release films are often used as inner or outer layers to package the asphalt or modified asphalt colloid. A common manufacturing process involves pouring the asphalt or modified asphalt onto a silicone-coated high-temperature resistant release film, which is then peeled off for use. However, current production processes involve asphalt or modified asphalt at 160-170℃, which can easily cause burns, deformation, and perforation in many release materials during use. Improving the high-temperature resistance of these materials is one of the urgent problems that the industry needs to solve. Secondly, the modified asphalt adhesive in self-adhesive waterproof membranes contains a large amount of small-molecule plasticizers. After a certain period of storage, these plasticizers migrate outwards, causing yellowing of the release film / face film and outer packaging film, severely affecting the product's appearance. Furthermore, the migration of small-molecule plasticizers and silicone oil can reduce the viscosity of the modified asphalt, leading to poor adhesion of the waterproof membrane to the substrate and water seepage. Therefore, improving the barrier properties of the membrane and reducing silicone transfer from the release film are also technical problems that need to be addressed.

[0003] Chinese patent CN116476496B discloses a high-barrier, wrinkle-resistant PP release film, consisting of, from top to bottom: a protective layer, a reinforcing layer, a barrier layer, another reinforcing layer, a protective layer, and a silicone oil layer. Through optimization of the layer structure components, particularly the preparation of modified polyethylene, the barrier performance and high-temperature resistance of the product are improved. However, the residual rate of the product is only 70%, and there is still a risk of silicone transfer reducing the viscosity of asphalt. Chinese patent CN106346925B discloses a nylon 6 modified polypropylene composite release film and its processing method. This patent designs a five-layer co-extruded structure consisting of a first surface layer, a second toughening and color-matching layer, a third nylon 6 modified polypropylene reinforced barrier layer, a fourth toughening and color-matching layer, and a fifth printing and color-matching layer. The use of nylon 6 modified polypropylene further improves the barrier performance and high-temperature resistance of the release film. The roll product containing solvent oil does not change color after three months of exposure to sunlight, and silicone transfer is minimal. However, there is still room for improvement in its barrier performance and ability to reduce silicone transfer. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention first provides a high-barrier, high-residue anti-sticking film, comprising a seven-layer co-extruded film structure; the anti-sticking film, from top to bottom, consists of: layer A and layer B mainly composed of polypropylene and polyolefin, layer C mainly composed of olefin-enol copolymer, layer D mainly composed of nylon, layer E mainly composed of polypropylene and polyolefin, and layers F and G mainly composed of polypropylene, polyolefin and color masterbatch.

[0005] Furthermore, the other side of the anti-stick film A layer is also coated with a silicone oil layer.

[0006] Furthermore, the thickness of the anti-stick film is 0.02-0.05 mm, preferably 0.025-0.04 mm; and the width is 800-1500 mm, preferably 1000-1100 mm.

[0007] Furthermore, based on the total thickness of the anti-adhesive film, the anti-adhesive film includes layer A with a thickness of 20-40%, layer B with a thickness of 4-12%, layer C with a thickness of 5-15%, layer D with a thickness of 10-20%, layer E with a thickness of 4-12%, layer F with a thickness of 10-20%, and layer G with a thickness of 11-22%.

[0008] Preferably, based on the total thickness of the anti-adhesive film, the anti-adhesive film includes layer A with a thickness of 25-35%, layer B with a thickness of 5-10%, layer C with a thickness of 7-13%, layer D with a thickness of 12-18%, layer E with a thickness of 5-10%, layer F with a thickness of 12-18%, and layer G with a thickness of 12-18%.

[0009] Furthermore, the polyolefin is selected from at least one of polyolefin elastomers, polybutene-1, and adhesive polyolefin resins.

[0010] Furthermore, based on the total mass of layer A, the raw materials for preparing layer A include: 80-95% polypropylene and 5-15% polyolefin elastomer.

[0011] In a preferred embodiment, the raw materials for preparing layer A, based on the total mass of layer A, include 88-92% polypropylene and 8-12% polyolefin elastomer.

[0012] Furthermore, the polypropylene is selected from homopolymer polypropylene and / or copolymer polypropylene, preferably copolymer polypropylene.

[0013] Furthermore, the melt flow rate of the polypropylene in layer A at 230°C and 2.16 kg is 1-11 g / 10 min.

[0014] Preferably, the melt flow rate of polypropylene in layer A at 230°C and 2.16 kg is 1-2.2 g / 10 min and 6-10.5 g / 10 min.

[0015] This application utilizes polypropylene with melt flow rates of 1-2.2 g / 10 min and 6-10.5 g / 10 min at 230°C and 2.16 kg in the membrane layer. This improves the membrane's barrier properties, mechanical properties, and high-temperature resistance, while preventing wrinkles on the membrane surface. This is likely because the polypropylene with these two melt flow rates interacts with the polyolefin elastomer in the subsequent melt extrusion process, affecting the viscosity, strength, and melt index of the melt system by altering the original intermolecular forces. Combined with the specified dosage, this not only improves the heat resistance of the anti-stick membrane and ensures excellent membrane surface smoothness after processing, but also makes the membrane bubbles more stable during processing, thereby enhancing the barrier properties and mechanical properties of the anti-stick membrane.

[0016] Further, based on the total mass of layer A, the raw materials for preparing layer A include: 50-70% polypropylene with a melt flow rate of 1-2.2 g / 10 min at 230°C and 2.16 kg, 18-42% polypropylene with a melt flow rate of 6-10.5 g / 10 min at 230°C and 2.16 kg, and 8-12% polyolefin elastomer.

[0017] In a preferred embodiment, based on the total mass of layer A, the raw materials for preparing layer A include: 55-65% polypropylene with a melt flow rate of 1-2.2 g / 10 min at 230°C and 2.16 kg, 25-35% polypropylene with a melt flow rate of 6-10.5 g / 10 min at 230°C and 2.16 kg, and 8-12% polyolefin elastomer.

[0018] Furthermore, the density of the polyolefin elastomer is 0.8-0.95 g / cm³. 3 The preferred value is 0.85-0.9 g / cm³. 3 The melt flow rate at 190℃ / 2.16kg is 0.1-2g / 10min, preferably 0.3-1g / 10min.

[0019] Furthermore, based on the total mass of layer B, the raw materials for preparing layer B include: 40-60% polypropylene and 40-60% adhesive polyolefin resin.

[0020] Furthermore, the melt flow rate of polypropylene in layer B at 230°C and 2.16 kg is 6-10.5 g / 10 min, more preferably 8 g / 10 min.

[0021] Furthermore, the adhesive polyolefin resin is at least one of acrylate-grafted vinyl elastomers and acrylate-glycidyl difunctional vinyl elastomers, such as Mitsui Chemicals Q516 from Japan.

[0022] Furthermore, the C layer is a 100% olefin-enol copolymer, wherein the olefin is selected from at least one of ethylene, propylene, butene, and octene, and the enol is selected from at least one of vinyl alcohol, propylene alcohol, butenol, and octenol.

[0023] Preferably, the olefin-enol copolymer is an ethylene-vinyl alcohol copolymer.

[0024] Furthermore, the water vapor permeability of the ethylene-vinyl alcohol copolymer is 1-3.2 g·mm / m. 2 / atm / 24hr, options include Kuraray EV0H E171B from Japan.

[0025] Furthermore, the D layer comprises 100% nylon PA6.

[0026] Furthermore, the relative viscosity of the nylon PA6 is 3.1-3.5, and the test standard for relative viscosity is GB / T1632-93. PA6 has excellent barrier and temperature resistance properties, but in this invention, only PA6 with a relative viscosity of 3.1-3.5 can ensure successful membrane production and improve the mechanical and barrier properties of the membrane. This may be because: high-viscosity PA6 has better tensile and flexural properties, and plays a better toughening role in the anti-stick membrane; secondly, its melt strength is higher, the membrane bubble is more stable, and it works together with other layers to improve the overall performance of the membrane. When medium- or low-viscosity PA6 is used, the resulting membrane bubble swaying is unstable, which leads to the inability to continuously produce the anti-stick membrane; the viscosity of PA6 is not necessarily better the higher it is, as too high a viscosity is not conducive to processing flowability.

[0027] Furthermore, the raw materials used to prepare the E layer and the B layer are the same.

[0028] Furthermore, based on the total mass of the F layer, the raw materials for preparing the F layer include: 77-90% polypropylene, 5-15% polyolefin elastomer, and 1-8% black masterbatch.

[0029] Furthermore, based on the total mass of the G layer, the raw materials for preparing the G layer include: 65-80% polypropylene, 5-15% polyolefin elastomer, and 10-20% white masterbatch.

[0030] Furthermore, the melt flow rates of the polypropylene in the F layer and G layer at 230°C and 2.16 kg are 1-2.2 g / 10 min and 6-10.5 g / 10 min, respectively.

[0031] In a preferred embodiment, based on the total mass of the F layer, the raw materials for preparing the F layer include: 55-65% polypropylene with a melt flow rate of 1-2.2 g / 10 min at 230°C and 2.16 kg, 20-30% polypropylene with a melt flow rate of 6-10.5 g / 10 min at 230°C and 2.16 kg, 5-15% polyolefin elastomer, and 1-8% black masterbatch.

[0032] In a preferred embodiment, based on the total mass of the G layer, the raw materials for preparing the G layer include: 55-65% polypropylene with a melt flow rate of 1-2.2 g / 10 min at 230°C and 2.16 kg, 10-20% polypropylene with a melt flow rate of 6-10.5 g / 10 min at 230°C and 2.16 kg, 5-15% polyolefin elastomer, and 10-20% white masterbatch.

[0033] Furthermore, both the white wood and the black masterbatch are carried by polypropylene. Masterbatch carried by polypropylene exhibits better compatibility with the main material in the film layer, reducing the likelihood of defects such as film surface discoloration, air leakage, or film breakage.

[0034] Furthermore, the raw materials of the silicone oil layer include: organosilicon acrylate and photoinitiator, with a mass ratio of 100:1-3.

[0035] Furthermore, the silicone acrylates include, but are not limited to, at least one of Evonik RC922, RC711, and RC902.

[0036] Preferably, the silicone acrylate comprises Evonik RC922 and RC711; the mass ratio of RC922 to RC711 is 6-8:2-4, preferably 7:3. RC711 can also be used as an anchoring agent. When its addition amount is reduced, the adhesion of the cured silicone oil is poor and the residual adhesion rate decreases; when its addition amount is too high, the peel force of the cured silicone oil product increases; only when the mass ratio of silicone acrylate RC922 to RC711 is specified as 6-8:2-4 does the anti-stick film have optimal peel force and residual adhesion rate.

[0037] Furthermore, the coating amount of the silicone oil layer raw material is 0.5-4 g / m². 2 Preferably 0.5-2 g / m 2 .

[0038] Secondly, this application also provides a method for preparing the high-barrier, high-residue anti-stick film, which includes the following steps in sequence: seven-layer film co-extrusion blown film, corona treatment, coating with silicone oil layer, UV curing, and winding.

[0039] Furthermore, in the step of co-extruding blown film of the seven-layer film, the extrusion temperatures of layers A, B, E, F, and G are: zone 1 205-215℃, zone 2 205-215℃, zone 3 205-215℃, zone 4 200-210℃, and zone 5 195-205℃; the extrusion temperature of layer C is: zone 1 210-220℃, zone 2 210-220℃, zone 3 210-220℃, zone 4 200-210℃, and zone 5 200-210℃; and the extrusion temperature of layer D is: zone 1 225-235℃, zone 2 235-245℃, zone 3 235-245℃, zone 4 235-245℃, and zone 5 235-245℃.

[0040] Furthermore, the temperatures in the extruder die area during co-extrusion are: 225-235℃, 235-245℃, 235-245℃, and 225-235℃.

[0041] Furthermore, the oxygen content in the UV curing environment is less than 50 ppm.

[0042] Furthermore, the UV curing light intensity is 100-300w / cm.

[0043] Finally, this application also provides the application of the aforementioned anti-stick membrane as a release film or face mask for waterproof rolls.

[0044] Beneficial effects

[0045] 1. The anti-stick membrane of this application, through the combination design of each membrane layer, has an oxygen permeability of 0.5 cm. 3 / m 2 With a strength of 0.1 MPa for 24 hours, it has excellent barrier properties. When used as a release film or face film for waterproof membranes, it can prevent the release of small molecule oil components from the modified bitumen adhesive of the waterproof membrane, improve the yellowing problem of waterproof membrane packaging, maintain the adhesion of the modified bitumen adhesive, and extend the shelf life of the membrane to up to 1 year.

[0046] 2. This application optimizes the composition, amount of silicone coating, and curing method of the silicone oil layer, so that the silicone oil layer has an intentional curing effect. The participation rate of the anti-adhesive film in adhesion can reach 95%, which can effectively reduce the transfer of silicone oil from the anti-adhesive film to the surface of the (modified) bitumen adhesive of the waterproof membrane, further ensuring the product adhesion of the waterproof (modified) bitumen adhesive and extending the storage period of the waterproof membrane.

[0047] 3. This application optimizes the combination and dosage of raw material components for each film layer, effectively improving the high temperature resistance of the anti-sticking film product, giving the anti-sticking film a very low product shrinkage rate, reducing wrinkles caused by shrinkage, and making the appearance of the waterproof membrane smoother when used in the production of waterproof membrane. Detailed Implementation

[0048] Example

[0049] Example 1

[0050] This embodiment provides a high-barrier, high-residue anti-sticking film with a thickness of 0.04 mm and a width of 1000 mm, comprising a seven-layer co-extruded film structure; the anti-sticking film, from top to bottom, consists of: layer A with a thickness of 30%, layer B with a thickness of 8%, layer C with a thickness of 10%, layer D with a thickness of 15%, layer E with a thickness of 8%, layer F with a thickness of 15%, and layer G with a thickness of 14%.

[0051] Based on the total mass of layer A, the raw materials for preparing layer A include: 60% polypropylene (Borealis, 707CF) with a melt flow rate of 1.5 g / 10 min at 230°C and 2.16 kg; 30% polypropylene (Shanghai Petrochemical, F800E) with a melt flow rate of 8.0 g / 10 min at 230°C and 2.16 kg; and 10% polyolefin elastomer. The density of the polyolefin elastomer is 0.87 g / cm³. 3 The melt flow rate at 190℃ / 2.16kg was 0.5g / 10min, purchased from Dow 7387.

[0052] Based on the total mass of layer B, the raw materials for preparing layer B include: 50% polypropylene and 50% adhesive polyolefin resin. The polypropylene, with a melt flow rate of 8 g / 10 min at 230°C and 2.16 kg, was purchased from Shanghai Petrochemical, F800E. The adhesive polyolefin resin is Mitsui Chemicals Q516 from Japan.

[0053] The C layer is 100% ethylene-vinyl alcohol copolymer, and the water vapor permeability of the ethylene-vinyl alcohol copolymer is 1.8 g·mm / m. 2 / atm / 24hr, purchased from Kuraray EV0HE171B in Japan.

[0054] The D layer is 100% nylon PA6 with a relative viscosity of 3.35, purchased from Sinopec Baling, BL2340.

[0055] The raw materials used to prepare the E layer and the B layer are the same.

[0056] Based on the total mass of layer F, the raw materials for preparing layer F include: 60% polypropylene (Borealis, 707CF) with a melt flow rate of 1.5 g / 10 min at 230°C and 2.16 kg, 25% polypropylene (Shanghai Petrochemical, F800E) with a melt flow rate of 8 g / 10 min at 230°C and 2.16 kg, 10% polyolefin elastomer (Dow 7387), and 5% black masterbatch (using PP as a carrier, purchased from Shanghai Yudi).

[0057] Based on the total mass of layer G, the raw materials for preparing layer G include: 60% polypropylene (Borealis, 707CF) with a melt flow rate of 1.5 g / 10 min at 230°C and 2.16 kg, 15% polypropylene (Shanghai Petrochemical, F800E) with a melt flow rate of 8 g / 10 min at 230°C and 2.16 kg, 10% polyolefin elastomer (Dow 7387), and 15% white masterbatch (using PP as a carrier, purchased from Shanghai Yudi).

[0058] The other side of the anti-stick film A layer is also coated with a silicone oil layer. The raw materials of the silicone oil layer include: light-release silicone acrylate (Evonik RC922), tight-release silicone acrylate (Evonik RC711), and silicone photoinitiator (Evonik A18), with a mass ratio of 70:30:2; the coating amount of the silicone oil layer raw materials is 1.0 g / m². 2 .

[0059] This embodiment also provides a method for preparing the high-barrier, high-residue anti-sticking film, which includes the following steps in sequence: seven-layer film co-extrusion blown film, corona treatment, coating with silicone oil layer, UV curing, and winding;

[0060] In the seven-layer film co-extrusion blown film step, the extrusion temperatures of layers A, B, E, F, and G are: zone 1 210℃, zone 2 210℃, zone 3 210℃, zone 4 205℃, and zone 5 200℃; the extrusion temperature of layer C is: zone 1 215℃, zone 2 215℃, zone 3 215℃, zone 4 205℃, and zone 5 205℃; and the extrusion temperature of layer D is: zone 1 230℃, zone 2 240℃, zone 3 240℃, zone 4 240℃, and zone 5 240℃. The extruder die temperature during co-extrusion is: 230℃, 240℃, 240℃, and 230℃.

[0061] The UV curing environment is filled with nitrogen to ensure that the oxygen content is below 50 ppm, and the UV curing light intensity is 200 W / cm.

[0062] Example 2

[0063] This embodiment provides a high-barrier, high-residue anti-sticking film with a thickness of 0.03 mm and a width of 1050 mm, comprising a seven-layer co-extruded film structure; the anti-sticking film, from top to bottom, consists of: layer A with a thickness of 33%, layer B with a thickness of 5%, layer C with a thickness of 13%, layer D with a thickness of 18%, layer E with a thickness of 5%, layer F with a thickness of 12%, and layer G with a thickness of 14%.

[0064] Based on the total mass of layer A, the raw materials for preparing layer A include: 65% polypropylene (Borealis, 707CF) with a melt flow rate of 1.5 g / 10 min at 230°C and 2.16 kg; 25% polypropylene (Shanghai Petrochemical, F800E) with a melt flow rate of 8.0 g / 10 min at 230°C and 2.16 kg; and 10% polyolefin elastomer. The density of the polyolefin elastomer is 0.87 g / cm³. 3 The melt flow rate at 190℃ / 2.16kg was 0.5g / 10min, purchased from Dow 7387.

[0065] Based on the total mass of layer B, the raw materials for preparing layer B include: 60% polypropylene and 40% adhesive polyolefin resin. The polypropylene, with a melt flow rate of 8 g / 10 min at 230°C and 2.16 kg, was purchased from Shanghai Petrochemical, F800E. The adhesive polyolefin resin is Mitsui Chemicals Q516 from Japan.

[0066] The C layer is 100% ethylene-vinyl alcohol copolymer, and the water vapor permeability of the ethylene-vinyl alcohol copolymer is 1.8 g·mm / m. 2 / atm / 24hr, purchased from Kuraray EV0HE171B in Japan.

[0067] The D layer is 100% nylon PA6 with a relative viscosity of 3.35, purchased from Sinopec Baling, BL2340.

[0068] The raw materials used to prepare the E layer and the B layer are the same.

[0069] Based on the total mass of layer F, the raw materials for preparing layer F include: 55% polypropylene (Borealis, 707CF) with a melt flow rate of 1.5 g / 10 min at 230°C and 2.16 kg, 30% polypropylene (Shanghai Petrochemical, F800E) with a melt flow rate of 8 g / 10 min at 230°C and 2.16 kg, 7% polyolefin elastomer (Dow 7387), and 8% black masterbatch (using PP as a carrier, purchased from Shanghai Yudi).

[0070] Based on the total mass of layer G, the raw materials for preparing layer G include: 65% polypropylene (Borealis, 707CF) with a melt flow rate of 1.5 g / 10 min at 230°C and 2.16 kg, 20% polypropylene (Shanghai Petrochemical, F800E) with a melt flow rate of 8 g / 10 min at 230°C and 2.16 kg, 5% polyolefin elastomer (Dow 7387), and 10% white masterbatch (using PP as a carrier, purchased from Shanghai Yudi).

[0071] The other side of the anti-stick film A layer is also coated with a silicone oil layer. The raw materials of the silicone oil layer include: light-release silicone acrylate (Evonik RC922), tight-release silicone acrylate (Evonik RC711), and silicone photoinitiator (Evonik A18), with a mass ratio of 70:30:1. The coating amount of the silicone oil layer raw materials is 2 g / m². 2 .

[0072] This embodiment also provides a method for preparing the high-barrier, high-residue anti-sticking film, which includes the following steps in sequence: seven-layer film co-extrusion blown film, corona treatment, coating with silicone oil layer, UV curing, and winding;

[0073] In the seven-layer film co-extrusion blown film step, the extrusion temperatures of layers A, B, E, F, and G are: zone 1 205℃, zone 2 205℃, zone 3 205℃, zone 4 200℃, and zone 5 195℃; the extrusion temperature of layer C is: zone 1 210℃, zone 2 210℃, zone 3 210℃, zone 4 200℃, and zone 5 200℃; and the extrusion temperature of layer D is: zone 1 225℃, zone 2 235℃, zone 3 235℃, zone 4 235℃, and zone 5 235℃. The extruder die temperature during co-extrusion is: 225℃, 235℃, 235℃, and 225℃.

[0074] The UV curing environment is filled with nitrogen to ensure that the oxygen content is below 50 ppm, and the UV curing light intensity is 300 W / cm.

[0075] Example 3

[0076] This embodiment provides a high-barrier, high-residue anti-sticking film with a thickness of 0.025 mm and a width of 1100 mm, comprising a seven-layer co-extruded film structure; the anti-sticking film, from top to bottom, consists of: layer A with a thickness of 25%, layer B with a thickness of 10%, layer C with a thickness of 7%, layer D with a thickness of 12%, layer E with a thickness of 10%, layer F with a thickness of 18%, and layer G with a thickness of 18%.

[0077] Based on the total mass of layer A, the raw materials for preparing layer A include: 55% polypropylene (Borealis, 707CF) with a melt flow rate of 1.5 g / 10 min at 230°C and 2.16 kg; 35% polypropylene (Shanghai Petrochemical, F800E) with a melt flow rate of 8.0 g / 10 min at 230°C and 2.16 kg; and 10% polyolefin elastomer. The density of the polyolefin elastomer is 0.87 g / cm³. 3 The melt flow rate at 190℃ / 2.16kg was 0.5g / 10min, purchased from Dow 7387.

[0078] Based on the total mass of layer B, the raw materials for preparing layer B include: 40% polypropylene and 60% adhesive polyolefin resin. The polypropylene, with a melt flow rate of 8 g / 10 min at 230°C and 2.16 kg, was purchased from Shanghai Petrochemical, F800E. The adhesive polyolefin resin is Mitsui Chemicals Q516 from Japan.

[0079] The C layer is 100% ethylene-vinyl alcohol copolymer, and the water vapor permeability of the ethylene-vinyl alcohol copolymer is 1.8 g·mm / m. 2 / atm / 24hr, purchased from Kuraray EV0HE171B in Japan.

[0080] The D layer is 100% nylon PA6 with a relative viscosity of 3.35, purchased from Sinopec Baling, BL2340.

[0081] The raw materials used to prepare the E layer and the B layer are the same.

[0082] Based on the total mass of layer F, the raw materials for preparing layer F include: 65% polypropylene (Borealis, 707CF) with a melt flow rate of 1.5 g / 10 min at 230°C and 2.16 kg, 20% polypropylene (Shanghai Petrochemical, F800E) with a melt flow rate of 8 g / 10 min at 230°C and 2.16 kg, 14% polyolefin elastomer (Dow 7387), and 1% black masterbatch (using PP as a carrier, purchased from Shanghai Yudi).

[0083] Based on the total mass of layer G, the raw materials for preparing layer G include: 55% polypropylene (Borealis, 707CF) with a melt flow rate of 1.5 g / 10 min at 230°C and 2.16 kg; 10% polypropylene (Shanghai Petrochemical, F800E) with a melt flow rate of 8 g / 10 min at 230°C and 2.16 kg; 15% polyolefin elastomer (Dow 7387); and 20% white masterbatch (using PP as a carrier, purchased from Shanghai Yudi).

[0084] The other side of the anti-stick film A layer is also coated with a silicone oil layer. The raw materials of the silicone oil layer include: light-release silicone acrylate (Evonik RC922), tight-release silicone acrylate (Evonik RC711), and silicone photoinitiator (Evonik A18), with a mass ratio of 70:30:3; the coating amount of the silicone oil layer raw materials is 0.5 g / m². 2 .

[0085] This embodiment also provides a method for preparing the high-barrier, high-residue anti-sticking film, which includes the following steps in sequence: seven-layer film co-extrusion blown film, corona treatment, coating with silicone oil layer, UV curing, and winding;

[0086] In the seven-layer film co-extrusion blown film step, the extrusion temperatures of layers A, B, E, F, and G are: zone 1 215℃, zone 2 215℃, zone 3 215℃, zone 4 210℃, and zone 5 205℃; the extrusion temperature of layer C is: zone 1 220℃, zone 2 220℃, zone 3 220℃, zone 4 210℃, and zone 5 210℃; and the extrusion temperature of layer D is: zone 1 235℃, zone 2 245℃, zone 3 245℃, zone 4 245℃, and zone 5 245℃. The extruder die temperature during co-extrusion is: 235℃, 245℃, 245℃, and 235℃.

[0087] The UV curing environment is filled with nitrogen to ensure that the oxygen content is below 50 ppm, and the UV curing light intensity is 100 W / cm.

[0088] Comparative Example 1

[0089] The results are basically the same as in Example 1, except that the polypropylene (Borealis, 707CF) with a melt flow rate of 1.5 g / 10 min at 230°C and 2.16 kg is replaced with polypropylene (Sinopec, T30S) with a melt flow rate of 2.9 g / 10 min at 230°C and 2.16 kg.

[0090] Comparative Example 2

[0091] It is basically the same as Example 1, except that the black masterbatch and white masterbatch are replaced with black masterbatch and white masterbatch with PE as carrier, which are purchased from Shanghai Yudi.

[0092] Comparative Example 3

[0093] It is basically the same as Example 1, except that PA6 is replaced with YH800 from Sinopec Baling.

[0094] Comparative Example 4

[0095] The results are basically the same as in Example 1, except that the raw materials for the silicone oil layer include: lightly peelable silicone acrylate (Evonik RC922), tightly peelable silicone acrylate (Evonik RC711), and silicone photoinitiator (Evonik A18), with a mass ratio of 75:25:2.

[0096] Comparative Example 5

[0097] The results are basically the same as in Example 1, except that the raw materials for the silicone oil layer include: lightly peelable silicone acrylate (Evonik RC922), tightly peelable silicone acrylate (Evonik RC711), and silicone photoinitiator (Evonik A18), with a mass ratio of 65:35:2.

[0098] Performance testing methods and results:

[0099] The performance comparison results of Example 1 and the comparative example are shown in Table 1.

[0100] Table 1

[0101]

[0102]

[0103] During the preparation of Comparative Example 1, the membrane bubble exhibited instability, and wrinkles of varying degrees were also generated on the membrane surface.

[0104] In Comparative Example 2, the white and black masterbatches using PE carriers exhibited film surface blooming, air leakage, and film breakage during processing, making it impossible to continue production.

[0105] In Comparative Example 3, the melt strength of the molten material was poor, and the film bubble was unstable, making it impossible to continue production.

Claims

1. A high-barrier, high-residual anti-sticking film, characterized by, It includes a seven-layer co-extruded film structure; the anti-stick film, from top to bottom, consists of: layers A and B mainly composed of polypropylene and polyolefin elastomers, layer C mainly composed of olefin-enol copolymers, layer D mainly composed of nylon, layer E mainly composed of polypropylene and polyolefin elastomers, and layers F and G mainly composed of polypropylene, polyolefin elastomers and color masterbatch; the other side of layer A of the anti-stick film is also coated with a silicone oil layer. The melt flow rates of the polypropylene in layers A, F, and G at 230°C and 2.16 kg include 1-2.2 g / 10 min and 6-10.5 g / 10 min, respectively. Based on the total mass of layer A, the raw materials for preparing layer A include: 80-95% polypropylene and 5-15% polyolefin elastomer; The D layer comprises 100% nylon PA6; the relative viscosity of the nylon PA6 is 3.1-3.5; Based on the total mass of the F layer, the raw materials for preparing the F layer include: 77-90% polypropylene, 5-15% polyolefin elastomer, and 1-8% black masterbatch; Based on the total mass of layer G, the raw materials for preparing layer G include: 65-80% polypropylene, 5-15% polyolefin elastomer, and 10-20% white masterbatch; The raw materials of the silicone oil layer include: organosilicon acrylate and photoinitiator, with a mass ratio of 100:1-3; the organosilicon acrylate includes Evonik RC922 and RC711; the mass ratio of RC922 and RC711 is 6-8:2-4.

2. The anti-sticking film according to claim 1, characterized in that, The thickness of the anti-sticking film is 0.02-0.05 mm; based on the total thickness of the anti-sticking film, the anti-sticking film includes layer A with a thickness of 20-40%, layer B with a thickness of 4-12%, layer C with a thickness of 5-15%, layer D with a thickness of 10-20%, layer E with a thickness of 4-12%, layer F with a thickness of 10-20%, and layer G with a thickness of 11-22%.

3. The anti-sticking film according to claim 2, characterized in that, Based on the total mass of layer B, the raw materials for preparing layer B include: 40-60% polypropylene and 40-60% adhesive polyolefin resin; the melt flow rate of polypropylene in layer B at 230℃ and 2.16kg is 6-10.5g / 10min.

4. The anti-sticking film according to claim 2, characterized in that, The C layer is 100% olefin-enol copolymer, wherein the olefin is selected from at least one of ethylene, propylene, butene, and octene, and the enol is selected from at least one of vinyl alcohol, propylene alcohol, butenol, and octenol.

5. A method for preparing an anti-stick film according to any one of claims 1-4, characterized in that, The steps are as follows: The process involves co-extruding a seven-layer film, blown film blowing, corona treatment, coating with a silicone oil layer, UV curing, and winding. In the co-extrusion blown film blowing process, the extrusion temperatures for layers A, B, E, F, and G are: Zone 1 205-215℃, Zone 2 205-215℃, Zone 3 205-215℃, Zone 4 200-210℃, Zone 5 195-205℃; the extrusion temperature for layer C is: Zone 1 210-220℃, Zone 2 210-220℃, Zone 3 210-220℃, Zone 4 200-210℃, Zone 5 200-210℃; and the extrusion temperature for layer D is: Zone 1 225-235℃, Zone 2 235-245℃, Zone 3 235-245℃, Zone 4 235-245℃, Zone 5 235-245℃.

6. An application of the anti-stick membrane according to any one of claims 1-4 as a release film or face mask for waterproof membranes.

Images