Corrosion-resistant PVC (polyvinyl chloride) substitute film and production process thereof

Abstract

The invention relates to a corrosion-resistant substitutive PVC (polyvinyl chloride) film and a production process thereof, and belongs to the technical field of polymer film materials. The film material is prepared from the following components in parts by weight: 100 parts of PET resin, 3.2 to 4.5 parts of organic silicon corrosion-resistant agent, 0.3 to 0.5 part of slipping agent, 0.15 to 0.2 part of nucleating agent and 4 to 6 parts of filler, according to the organic silicon corrosion-resistant agent, N-methyldiethanolamine and epoxy-terminated silicone oil are subjected to ring opening to form an organic silicon compound with N-methyldiethanolamine as a bridging chain segment, namely an organic silicon matrix, then active primary amine of tetramethylpiperidinamine and residual epoxy groups at the end of the organic silicon matrix are subjected to ring opening and end capping, an end functional hindered amine structure is introduced, and the organic silicon corrosion-resistant agent is prepared. And finally, oxalyl chloride monoethyl ester and hydroxyl group obtained after ring opening of the functional intermediate are esterified, diester short chain modification is introduced into a molecular side chain of the functional intermediate, and the medium corrosion resistance and aging corrosion resistance of the membrane material are improved through introduction of an organic silicon corrosion-resistant agent.

Description

Technical Field

[0001] The invention belongs to the technical field of polymer film materials, and in particular relates to a corrosion-resistant PVC replacement film and a production process thereof. Background Art

[0002] Polyvinyl chloride (PVC) film is a common film material, widely used in architectural decoration, packaging, medical treatment, electronics and other fields. However, pure PVC material has high hardness and great brittleness. Generally, a large amount of plasticizers need to be added to PVC film materials, and these plasticizers are easy to precipitate and cause harm to the environment. It is difficult to biodegrade by itself, and will accumulate in the environment for a long time after being abandoned, causing white pollution. Its molecules contain a large amount of chlorine elements, which will release highly toxic dioxins and hydrogen chloride gases during the incineration process, causing serious harm to the environment and human health.

[0003] In comparison, polyethylene terephthalate (PET) film is a recyclable and environmentally friendly material with similar properties to PVC film, but its molecular backbone is mainly ester chain, which has good degradation prospects. No plasticizer is required for the preparation of film materials, and PET film materials have high strength and good thermal stability, making them a preferred substitute for PVC film materials. However, the PET molecular chain contains a large number of ester structures, which makes it susceptible to corrosion by chemicals such as acids and alkalis, and the phenyl ester structure is prone to aging in light and heat environments, resulting in insufficient corrosion resistance of PET film materials, which greatly limits the replacement of PET film materials for PVC film materials. In the prior art, corrosion-resistant substances are usually blended and modified to improve the corrosion resistance of PET film materials, such as inorganic fillers, silicones, light stabilizers, etc. However, these blends are not compatible enough with the PET matrix, and are generally used in large amounts and the effect is not obvious. Summary of the invention

[0004] In order to solve the technical problems mentioned in the background technology, the purpose of the present invention is to provide a corrosion-resistant alternative to PVC film and a production process thereof.

[0005] The purpose of the present invention can be achieved through the following technical solutions: A corrosion-resistant film replacing a PVC film comprises, by weight, 100 parts of PET resin, 3.2-4.5 parts of an organic silicon corrosion resistant agent, 0.3-0.5 parts of a lubricant, 0.15-0.2 parts of a nucleating agent and 4-6 parts of a filler.

[0006] The organosilicon corrosion resistant agent is prepared by the following method: Step A1: premix the epoxy-terminated silicone oil and acetone, heat to 55-65°C, stir at 60-90 rpm, slowly add N-methyldiethanolamine and react for 3-4.5 hours. After the reaction is completed, evaporate under reduced pressure to remove acetone to obtain an organosilicon matrix; Furthermore, the epoxy content of the epoxy-terminated silicone oil, the amount ratio of N-methyldiethanolamine and acetone is 0.1 mol: 36-42 mmol: 40-55 mL, and the tertiary amine structure in the N-methyldiethanolamine molecule self-promotes the ring opening with the epoxy-terminated silicone oil to form an organic silicon compound with N-methyldiethanolamine as a bridging segment; Furthermore, the epoxy-terminated silicone oil is a low molecular weight silicone oil with a room temperature viscosity of no more than 50 mm 2 / s, the terminal epoxy silicone oil in this state maintains good reactivity and forms organic silicone chains that are easy to disperse in the membrane material matrix.

[0007] Step A2: Mix the organosilicon matrix, tetramethylpiperidinamine, triphenylphosphine and dimethylacetamide, introduce nitrogen protection, heat to 80-95°C, stir at 120-150 rpm, react for 1.5-2h, wash and separate the liquid after the reaction, remove the aqueous phase and vacuum dry to obtain a functionalized intermediate; Furthermore, the dosage ratio of the silicone matrix, tetramethylpiperidinamine, triphenylphosphine and dimethylacetamide is 100g:8-12mL:0.2-0.3g:60-90mL. Under the promotion of triphenylphosphine, the active primary amine of tetramethylpiperidinamine and the residual epoxy group at the end of the silicone matrix continue to open the ring and seal.

[0008] Step A3: The functionalized intermediate, ethyl oxalyl chloride, tetraethyl titanate and anhydrous toluene are mixed, dry nitrogen is introduced for protection, stirring is applied at 30-50 rpm, the temperature is raised to 45-60°C for reaction for 2-3 hours, then the pressure is reduced to 1 kPa, the temperature is further raised to 75-90°C for reaction for 1.2-1.5 hours, and after the reaction is completed, the toluene is removed by rotary evaporation to obtain an organosilicon corrosion inhibitor; Furthermore, the usage ratio of the functionalized intermediate, ethyl oxalyl chloride, tetraethyl titanate and anhydrous toluene is 100 g: 20-30 mL: 0.12-0.16 g: 50-70 mL. Under the promotion of tetraethyl titanate, ethyl oxalyl chloride is esterified with the hydroxyl group of the functionalized intermediate after ring opening.

[0009] Preferably, the lubricant is selected from stearic acid amide.

[0010] Preferably, the filler is selected from oleophilic nano-silica.

[0011] A production process for corrosion-resistant PVC film replacement, specifically comprising the following steps: Step S1: PET resin, silicone anti-corrosion agent, lubricant, nucleating agent and filler are mixed in a high-speed mixer, and then transferred to a mixing kettle and mixed at 260° C. until the torque is stable, and the material is discharged and pelletized to obtain a composite masterbatch; Step S2: melt the composite masterbatch to extrude a cast sheet, calender to a fixed thickness to form a green film, and then stretch it to obtain a corrosion-resistant PVC substitute film.

[0012] Beneficial effects of the present invention: The invention discloses a PET base film material. The medium corrosion resistance and aging corrosion resistance of the film material are improved by introducing a self-developed organic silicon corrosion resistant agent, so that the PET film material can effectively replace the traditional PVC film material under some corrosion conditions; the organic silicon corrosion resistant agent is formed by ring-opening N-methyldiethanolamine and terminal epoxy silicone oil to form an organic silicon compound with N-methyldiethanolamine as a bridging chain segment, that is, an organic silicon matrix, and then the active primary amine of tetramethylpiperidinamine and the residual epoxy group at the end of the organic silicon matrix are further ring-opened and end-capped, and a terminal functional hindered amine structure is introduced, that is, a functionalized intermediate is obtained, and finally ethyl oxalyl chloride is ring-opened with the functionalized intermediate to form an organic silicon compound with N-methyldiethanolamine as a bridging chain segment, that is, an organic silicon matrix. The hydroxyl group of the functionalized intermediate is esterified, and a diester short chain modification is introduced into the molecular side chain of the functionalized intermediate. The diester short chain is highly compatible with the PET matrix macromolecule, and the silicone main chain of the silicone corrosion inhibitor can be fully dispersed into the matrix during the blending process. The silicone chain itself has good corrosion resistance, and after uniform dispersion, it plays a role in shielding and protecting the matrix. At the same time, it is a macromolecular segment, which is interspersed in the macromolecular network of the matrix to play a connecting role, thereby alleviating the problem of rapid deterioration of mechanical properties caused by corrosion of the matrix. In addition, thanks to good dispersibility, the silicone corrosion inhibitor can evenly introduce hindered amine structure into the matrix, effectively improving the aging corrosion resistance of the matrix. DETAILED DESCRIPTION

[0013] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0014] Example 1, preparation of corrosion-resistant film to replace PVC, the specific implementation process is as follows: (1) Preparation of silicone corrosion inhibitor Step A1: premix the end-epoxy silicone oil and acetone, heat to 65°C, stir at 90 rpm, slowly add N-methyldiethanolamine, and control the addition time to be 2.5 hours. After complete addition, continue to stir at constant temperature to react, and control the addition reaction time of N-methyldiethanolamine to be 4.5 hours. The end-epoxy silicone oil is selected from X-22-163A silicone oil, and the room temperature viscosity is about 30 mm 2 / s, the epoxy content of the epoxy-terminated silicone oil, the amount ratio of N-methyldiethanolamine and acetone is 0.1 mol: 42 mmol: 55 mL, and after the reaction is completed, the acetone is evaporated under reduced pressure to obtain an organosilicon matrix.

[0015] Step A2: Mix the organosilicon matrix, tetramethylpiperidinamine, triphenylphosphine and dimethylacetamide, introduce nitrogen protection, heat to 95°C, stir at 150 rpm, and react for 2 hours, wherein the dosage ratio of the organosilicon matrix, tetramethylpiperidinamine, triphenylphosphine and dimethylacetamide is 100 g:8 mL:0.3 g:90 mL. After the reaction is completed, wash the liquid with water, remove the aqueous phase and vacuum dry to obtain a functionalized intermediate.

[0016] Step A3: Take the functionalized intermediate, ethyl oxalyl chloride, tetraethyl titanate and anhydrous toluene, mix them, introduce dry nitrogen protection, apply stirring at 50 rpm, heat to 60 ° C and react for 3 hours, then reduce the pressure to 1 kPa, continue to heat to 90 ° C and react for 1.5 hours, wherein the amount ratio of the functionalized intermediate, ethyl oxalyl chloride, tetraethyl titanate and anhydrous toluene is 100 g: 20 mL: 0.16 g: 70 mL. After the reaction, the toluene is removed by rotary evaporation to obtain an organosilicon corrosion inhibitor.

[0017] (2) Preparation of membrane materials Step S1: Take the raw materials according to weight parts, 100 parts of PET resin, TRN-RTJ type resin raw material is used in the implementation process; 4.5 parts of organic silicon corrosion resistant agent, which is homemade in this embodiment; 0.3 parts of lubricant, industrial grade stearic acid amide is used in the implementation process; 0.2 parts of nucleating agent, Sanulater HK195 type composite metal salt nucleating agent is used in the implementation process; 4 parts of filler, VK-SP30S type oleophilic nano-silica is used in the implementation process; add each raw material into a high mixer and mix at 800rpm for 10min, then transfer to a mixing kettle and mix at 260℃ for 25min, the torque tends to be stable, and the material is cut into pellets to obtain a composite masterbatch.

[0018] Step S2: melt-extrude the composite masterbatch at 280°C to form a sheet, calender and set the thickness to form a green film with a thickness of 0.2 mm, and then stretch the green film to form a corrosion-resistant PVC substitute film with a stretch ratio of 3.5.

[0019] Example 2, preparation of corrosion-resistant film to replace PVC, the specific implementation process is as follows: (1) Preparation of silicone corrosion inhibitor Step A1: premix the end-epoxy silicone oil and acetone, heat to 55°C, stir at 60rpm, and then slowly add N-methyldiethanolamine, controlling the addition time to be 1.5h. After complete addition, continue to stir at a constant temperature to react, and control the addition reaction time of N-methyldiethanolamine to be 3h. Among them, the end-epoxy silicone oil is selected from KF-105 silicone oil, and the room temperature viscosity is about 15mm 2 / s, the epoxy content of the epoxy-terminated silicone oil, the amount ratio of N-methyldiethanolamine and acetone is 0.1 mol: 36 mmol: 40 mL, and after the reaction is completed, the acetone is evaporated under reduced pressure to obtain an organosilicon matrix.

[0020] Step A2: Mix the organosilicon matrix, tetramethylpiperidinamine, triphenylphosphine and dimethylacetamide, introduce nitrogen protection, heat to 80°C, stir at 120rpm, and react for 1.5h, wherein the dosage ratio of the organosilicon matrix, tetramethylpiperidinamine, triphenylphosphine and dimethylacetamide is 100g:12mL:0.2g:60mL. After the reaction is completed, wash the liquid with water, remove the aqueous phase and vacuum dry to obtain a functionalized intermediate.

[0021] Step A3: Take the functionalized intermediate, ethyl oxalyl chloride, tetraethyl titanate and anhydrous toluene, mix them, introduce dry nitrogen protection, apply stirring at 30rpm, heat to 45°C and react for 2h, then reduce the pressure to 1kPa, continue to heat to 75°C and react for 1.2h, wherein the amount ratio of the functionalized intermediate, ethyl oxalyl chloride, tetraethyl titanate and anhydrous toluene is 100g:30mL:0.12g:50mL. After the reaction, remove toluene by rotary evaporation to obtain an organosilicon corrosion inhibitor.

[0022] (2) Preparation of membrane materials Step S1: Take the raw materials according to weight parts, 100 parts of PET resin, TRN-RTJ type resin raw material is used in the implementation process; 3.2 parts of organic silicon corrosion resistant agent, which is homemade in this embodiment; 0.5 parts of lubricant, industrial grade stearic acid amide is used in the implementation process; 0.15 parts of nucleating agent, Sanulater HK195 type composite metal salt nucleating agent is used in the implementation process; 6 parts of filler, VK-SP30S type oleophilic nano-silica is used in the implementation process; add each raw material into a high mixer and mix at 800rpm for 10min, then transfer to a mixing kettle and mix at 260℃ for 25min, the torque tends to be stable, and the material is cut into pellets to obtain a composite masterbatch.

[0023] Step S2: melt-extrude the composite masterbatch at 280°C to form a sheet, calender and set the thickness to form a green film with a thickness of 0.2 mm, and then stretch the green film to form a corrosion-resistant PVC substitute film with a stretch ratio of 3.5.

[0024] Example 3, preparation of corrosion-resistant film to replace PVC, the specific implementation process is as follows: (1) Preparation of silicone corrosion inhibitor Step A1: premix the end-epoxy silicone oil and acetone, heat to 50°C, stir at 60rpm, and then slowly add N-methyldiethanolamine, controlling the addition time to be 2h. After complete addition, continue to stir at constant temperature to react, and control the addition reaction time of N-methyldiethanolamine to be 3.5h. Among them, the end-epoxy silicone oil is selected from KF-105 silicone oil, and the room temperature viscosity is about 15mm 2 / s, the epoxy content of the epoxy-terminated silicone oil, the amount ratio of N-methyldiethanolamine and acetone is 0.1 mol: 40 mmol: 50 mL, and after the reaction is completed, the acetone is evaporated under reduced pressure to obtain an organosilicon matrix.

[0025] Step A2: Mix the organosilicon matrix, tetramethylpiperidinamine, triphenylphosphine and dimethylacetamide, introduce nitrogen protection, heat to 85°C, stir at 120rpm, and react for 1.8h, wherein the dosage ratio of the organosilicon matrix, tetramethylpiperidinamine, triphenylphosphine and dimethylacetamide is 100g:10mL:0.25g:80mL. After the reaction is completed, wash the liquid with water, remove the aqueous phase and vacuum dry to obtain a functionalized intermediate.

[0026] Step A3: Take the functionalized intermediate, ethyl oxalyl chloride, tetraethyl titanate and anhydrous toluene, mix them, introduce dry nitrogen protection, apply stirring at 30rpm, heat to 50℃ and react for 2.8h, then reduce the pressure to 1kPa, continue to heat to 80℃ and react for 1.4h, wherein the amount ratio of the functionalized intermediate, ethyl oxalyl chloride, tetraethyl titanate and anhydrous toluene is 100g:25mL:0.14g:60mL. After the reaction, remove toluene by rotary evaporation to obtain an organosilicon corrosion inhibitor.

[0027] (2) Preparation of membrane materials Step S1: Take the raw materials according to weight parts, 100 parts of PET resin, TRN-RTJ type resin raw material is used in the implementation process; 3.8 parts of organic silicon corrosion resistant agent, which is homemade in this embodiment; 0.4 parts of lubricant, industrial grade stearic acid amide is used in the implementation process; 0.17 parts of nucleating agent, Sanulater HK195 type composite metal salt nucleating agent is used in the implementation process; 5 parts of filler, VK-SP30S type oleophilic nano-silica is used in the implementation process; add each raw material into a high mixer and mix at 800rpm for 10min, then transfer to a mixing kettle and mix at 260℃ for 25min, the torque tends to be stable, and the material is cut into pellets to obtain a composite masterbatch.

[0028] Step S2: melt-extrude the composite masterbatch at 280°C to form a sheet, calender and set the thickness to form a green film with a thickness of 0.2 mm, and then stretch the green film to form a corrosion-resistant PVC substitute film with a stretch ratio of 3.5.

[0029] Example 4, preparation of corrosion-resistant film to replace PVC, the specific implementation process is as follows: (1) Preparation of silicone corrosion inhibitor Step A1: premix the end-epoxy silicone oil and acetone, heat to 60°C, stir at 90 rpm, and then slowly add N-methyldiethanolamine, controlling the addition time to be 2.2 hours. After complete addition, continue to stir at a constant temperature to react, and control the addition reaction time of N-methyldiethanolamine to be 3.5 hours. Among them, the end-epoxy silicone oil is selected from KF-105 silicone oil, and the room temperature viscosity is about 15 mm 2 / s, the epoxy content of the epoxy-terminated silicone oil, the amount ratio of N-methyldiethanolamine and acetone is 0.1 mol: 40 mmol: 55 mL, and after the reaction is completed, the acetone is evaporated under reduced pressure to obtain an organosilicon matrix.

[0030] Step A2: Mix the organosilicon matrix, tetramethylpiperidinamine, triphenylphosphine and dimethylacetamide, introduce nitrogen protection, heat to 88°C, stir at 150 rpm, and react for 2 hours, wherein the dosage ratio of the organosilicon matrix, tetramethylpiperidinamine, triphenylphosphine and dimethylacetamide is 100 g:12 mL:0.3 g:80 mL. After the reaction is completed, wash the liquid with water, remove the aqueous phase and vacuum dry to obtain a functionalized intermediate.

[0031] Step A3: Take the functionalized intermediate, ethyl oxalyl chloride, tetraethyl titanate and anhydrous toluene, mix them, introduce dry nitrogen protection, apply stirring at 50 rpm, heat to 55 ° C and react for 2.2 hours, then reduce the pressure to 1 kPa, continue to heat to 85 ° C and react for 1.3 hours, wherein the amount ratio of the functionalized intermediate, ethyl oxalyl chloride, tetraethyl titanate and anhydrous toluene is 100 g: 30 mL: 0.15 g: 60 mL. After the reaction, the toluene is removed by rotary evaporation to obtain an organosilicon corrosion inhibitor.

[0032] (2) Preparation of membrane materials Step S1: Take the raw materials according to weight parts, 100 parts of PET resin, TRN-RTJ type resin raw material is used in the implementation process; 4.2 parts of organic silicon corrosion resistant agent, which is homemade in this embodiment; 0.4 parts of lubricant, industrial grade stearic acid amide is used in the implementation process; 0.2 parts of nucleating agent, Sanulater HK195 type composite metal salt nucleating agent is used in the implementation process; 5.5 parts of filler, VK-SP30S type oleophilic nano-silica is used in the implementation process; add each raw material into a high mixer and mix at 800rpm for 10min, then transfer to a mixing kettle and mix at 260℃ for 25min, the torque tends to be stable, and the material is cut into pellets to obtain a composite masterbatch.

[0033] Step S2: melt-extrude the composite masterbatch at 280°C to form a sheet, calender and set the thickness to form a green film with a thickness of 0.2 mm, and then stretch the green film to form a corrosion-resistant PVC substitute film with a stretch ratio of 3.5.

[0034] Comparative Example This comparative example refers to Example 4, but without adding the organic silicon corrosion inhibitor, 3.5 parts of side chain acrylate modified silicone oil IOTA 170, 0.2 parts of light stabilizer 770 and 0.8 parts of PL-215 silicone powder are added, and the rest of the implementation process is exactly the same as Example 4.

[0035] The above membrane materials were tested for medium corrosion resistance and aging corrosion resistance, as follows: Medium corrosion resistance: Prepare 10% sodium hydroxide aqueous solution, 10% sulfuric acid aqueous solution, 20% sodium chloride aqueous solution and 50% ethanol aqueous solution by volume, take samples of the membrane and place them in the corrosive solution, soak them at room temperature for 24 hours, rinse them three times and dry them; Aging and corrosion resistance: Place the sample in a UV aging box, control the temperature at 60°C, use a 50W UV lamp for irradiation, and the aging time is 168h; According to GB / T1040.1-2018 standard, tensile tests were carried out on the samples before and after corrosion, and the change rate of tensile strength Δh and the change rate of elongation at break Δs were used to characterize the corrosion resistance of the samples. The specific test results are shown in the following table:

[0036] Note: “-” indicates reduced performance.

[0037] It can be seen from the test results in the above table that the membrane material prepared by the present invention has good tolerance to common acid, alkali and salt media and ultraviolet aging corrosion, among which Example 1 has better resistance to medium corrosion, and Examples 2-4 have better resistance to ultraviolet aging corrosion.

[0038] In the description of the specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0039] The above contents are merely examples and explanations of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the invention or exceed the scope defined by the claims, they shall all fall within the protection scope of the present invention.

Claims

1. A corrosion-resistant alternative to PVC film, characterized in that: The composition includes, by weight: 100 parts of PET resin, 3.2-4.5 parts of organic silicon corrosion inhibitor, 0.3-0.5 parts of lubricant, 0.15-0.2 parts of nucleating agent and 4-6 parts of filler; The organosilicon corrosion resistant agent is prepared by the following method: Step A1: premix the epoxy-terminated silicone oil and acetone, heat to 55-65°C, stir and slowly add N-methyldiethanolamine to react for 3-4.5h, and evaporate under reduced pressure to remove acetone after the reaction to obtain an organosilicon matrix; Step A2: Mix the organosilicon matrix, tetramethylpiperidinamine, triphenylphosphine and dimethylacetamide, introduce nitrogen protection, heat to 80-95°C, stir and react for 1.5-2h, wash and separate the liquid after the reaction, remove the aqueous phase and vacuum dry to obtain a functionalized intermediate; Step A3: Mix the functionalized intermediate, monoethyl oxalyl chloride, tetraethyl titanate and anhydrous toluene, introduce dry nitrogen for protection, heat to 45-60°C with stirring, react for 2-3h, then reduce the pressure to 1kPa, continue to heat to 75-90°C, react for 1.2-1.5h, and remove toluene by rotary evaporation after the reaction to obtain an organosilicon corrosion inhibitor.

2. A corrosion-resistant PVC film replacement according to claim 1, characterized in that: The epoxy content of the epoxy-terminated silicone oil, the dosage ratio of N-methyldiethanolamine and acetone are 0.1 mol: 36-42 mmol: 40-55 mL.

3. A corrosion-resistant PVC film replacement according to claim 2, characterized in that: The room temperature viscosity of epoxy silicone oil is not higher than 50mm 2 / s.

4. A corrosion-resistant PVC replacement film according to claim 2, characterized in that: The usage ratio of the organic silicon matrix, tetramethylpiperidinamine, triphenylphosphine and dimethylacetamide is 100g:8-12mL:0.2-0.3g:60-90mL.

5. A corrosion-resistant PVC replacement film according to claim 4, characterized in that: The usage ratio of the functionalized intermediate, ethyl oxalyl chloride, tetraethyl titanate and anhydrous toluene is 100 g: 20-30 mL: 0.12-0.16 g: 50-70 mL.

6. A corrosion-resistant PVC replacement membrane according to claim 1, characterized in that: The lubricant is stearic acid amide.

7. A corrosion-resistant PVC replacement film according to claim 1, characterized in that: The filler is oleophilic nano-silica.

8. A production process for a corrosion-resistant PVC film substitute according to any one of claims 1 to 7, characterized in that: Including the following processes: Step S1: PET resin, silicone anti-corrosion agent, lubricant, nucleating agent and filler are mixed in a high-speed mixer, and then transferred to a mixing kettle and mixed at 260° C. until the torque is stable, and the material is discharged and pelletized to obtain a composite masterbatch; Step S2: melt the composite masterbatch to extrude a cast sheet, calender to a fixed thickness to form a green film, and then stretch it to obtain a corrosion-resistant PVC substitute film.

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