A fluoropolymer aid and its use in polytrifluorochloroethylene film

Abstract

This invention discloses a fluoropolymer additive, which is a copolymer of trifluorochloroethylene and perfluoro(2,2-dimethyl)-1,3-dioxane or perfluoropropylene-vinyl ether. The fluoropolymer additive contains 30-70 mol% of the structural units of perfluoro(2,2-dimethyl)-1,3-dioxane or perfluoropropylene-vinyl ether. The melt index of the fluoropolymer additive at 275°C and 2.16 kg is 500-2000 g / 10 min. Using the fluoropolymer additive provided by this invention as an additive improves the processing performance of polychlorotrifluoroethylene resin, ensuring the water vapor transmission rate of the polychlorotrifluoroethylene film while simultaneously improving the visible light transmittance and tensile strength at break of the polychlorotrifluoroethylene film.

Description

Technical Field

[0001] This invention relates to the field of polymer films, and more specifically to a fluoropolymer additive and its application in polychlorotrifluoroethylene films. Background Technology

[0002] Polychlorotrifluoroethylene (PCTFE) is a polymer homopolymer formed by the homopolymerization of trifluorochloroethylene. Due to the fluorine and chlorine atoms surrounding the main chain, its molecular structure is relatively regular. PCTFE exhibits high crystallinity and a high melting point (211-216℃), giving it superior barrier properties and low-temperature resistance compared to most thermoplastic hydrocarbon polymers. It can be used in pharmaceutical packaging, novel photovoltaic encapsulation, and high-frequency communications. However, PCTFE is difficult to dissolve in common solvents, and while solution casting avoids high heat, PCTFE films have lower mechanical properties, failing to meet application requirements. Furthermore, PCTFE has extremely slow heat transfer efficiency and high melt viscosity; low temperatures do not meet processing requirements, necessitating high temperatures and pressures to achieve sufficient processing flow. Under high heat and high shear, it is prone to degradation, making direct melt extrusion processing of PCTFE resin very difficult. Although copolymerization modification can effectively improve the processing performance of PCTFE, PCTFE copolymers often sacrifice other resin properties, such as barrier properties, thus limiting the resin's applications.

[0003] Currently, existing technologies for improving the processing flowability of PCTFE resin have adopted the following solutions: Patent (CN111978661A) discloses a high water-resistant and corrosion-resistant PCTFE material and its modification method, which involves compounding polymeric PCTFE and low molecular weight PCTFE and incorporating fluorocarbon compounds and stabilizers to improve its processability while maintaining the original excellent properties of PCTFE. This technology does not address the impact on the mechanical properties of PCTFE, and low molecular weight PCTFE may be more prone to degradation at high temperatures. Patent CN201310334933.X proposes that adding acrylate can shorten the melt plasticizing time of PCTFE and improve the processing flow, mechanical properties, and thermal properties of PCTFE products. Simultaneously, it utilizes rare earth composite stabilizers and N,N'-bis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl]hydrazine to mitigate the problem of PCTFE decomposition during injection molding, leading to color darkening and performance degradation. However, acrylate can easily make the final product brittle, and the rare earth composite stabilizer itself has low high-temperature thermal stability, potentially degrading during high-temperature processing and causing a decline in the final product's performance. Patent CN112552624A discloses a method for improving the processability of PCTFE resin and the mechanical toughness of its products, which involves blending PCTFE homopolymer with CTFE and other fluorinated monomer copolymers to improve the resin's processing performance. However, the copolymers have a high fluorine content and limited high-temperature flow, thus limiting the improvement effect.

[0004] Therefore, improving the processing thermal stability of polychlorotrifluoroethylene resin, reducing the high-temperature yellowing value of the resin, increasing the process parameter window of the resin in the direct melt extrusion process, and ensuring the high permeability, high barrier properties and good mechanical properties of polychlorotrifluoroethylene film are of great significance for its future applications. Summary of the Invention

[0005] The technical problem that the invention aims to solve

[0006] To address the issues of high viscosity and poor thermal stability when directly hot-melt processing polychlorotrifluoroethylene (PTFE) resin to prepare films, the inventors of this invention discovered that adding an appropriate amount of fluoropolymer additives with a specific melt index to PTFE resin can solve the problem. It is speculated that this is because the high steric hindrance of the epoxy perfluoroolefin in the fluoropolymer additives effectively de-entangles the polymer chains, forming an internal lubricating effect that improves the resin's fluidity. Furthermore, the difference in melt index improves the fluidity of PTFE resin; and the good compatibility between the trifluorochloroethylene structural units in the fluoropolymer additives and PTFE improves plasticization uniformity.

[0007] Technical solutions for solving the problem

[0008] In a first aspect, the present invention provides a fluoropolymer additive, wherein the fluoropolymer additive is a copolymer of trifluorochloroethylene and perfluoro(2,2-dimethyl)-1,3-dioxane or perfluoropropylene-vinyl ether.

[0009] The fluoropolymer additive contains 30-70 mol% of perfluoro(2,2-dimethyl)-1,3-dioxane or perfluoropropylene-vinyl ether structural units.

[0010] The melt index of the fluoropolymer additive at 275°C and 2.16 kg is 500–2000 g / 10 min.

[0011] The fluoropolymer additive of the present invention has a melt index of 500-2000 g / 10 min at 275°C and 2.16 kg. From the perspective of resin flowability and film performance, preferably, the melt index of the fluoropolymer additive at 275°C and 2.16 kg is 800-1500 g / 10 min; more preferably, the melt index is 1000-1500 g / 10 min; and even more preferably, the melt index is 1200-1400 g / 10 min.

[0012] The fluoropolymer additive of the present invention comprises 30-70 mol% of perfluoro(2,2-dimethyl)-1,3-dioxacyclopentene or perfluoropropylene-vinyl ether structural units; more preferably, the content of perfluoro(2,2-dimethyl)-1,3-dioxacyclopentene or perfluoropropylene-vinyl ether units in the fluoropolymer additive is 40-60 mol%.

[0013] The fluoropolymer additives described in this invention are formed by free radical copolymerization of trifluorofluoroethylene (CTFE) and perfluoro(2,2-dimethyl)-1,3-dioxanepentene, or by copolymerization of trifluorofluoroethylene (CTFE) and perfluoropropylene-vinyl ether monomers. The double bonds of the linear structure of the perfluoropropylene-vinyl ether monomers are free radical polymerized to form a cyclic structure, and these cyclic structural units are arranged alternately with the CTFE structural units.

[0014] Secondly, the present invention also provides a film-forming formula for a polychlorotrifluoroethylene film, the film-forming formula comprising the fluoropolymer additives described in the first aspect.

[0015] The film-forming formulation of the polychlorotrifluoroethylene film of the present invention comprises the following components in parts by weight:

[0016] 100 parts of polychlorotrifluoroethylene;

[0017] 1 to 10 parts of the fluoropolymer additive;

[0018] 0.1 to 1 part antioxidant.

[0019] From the perspective of resin flowability and film performance, preferably, the formulation of the polychlorotrifluoroethylene film contains the following components in parts by weight:

[0020] 100 parts of polychlorotrifluoroethylene;

[0021] 2 to 4 parts of the fluoropolymer additive;

[0022] 0.3 to 0.6 parts antioxidant.

[0023] The polychlorotrifluoroethylene described in this invention can be a homopolymer of chlorotrifluoroethylene or a copolymer of chlorotrifluoroethylene. When it is a copolymer of chlorotrifluoroethylene, the content of chlorotrifluoroethylene structural units accounts for 90-99.5 mol%.

[0024] The polychlorotrifluoroethylene described in this invention has a melt index of 0.5–5 g / 10 min at 275°C and 2.16 kg. Preferably, it is 2–5 g / 10 min.

[0025] The antioxidant described in this invention is selected from antioxidants commonly used in the field of thin film preparation. Preferably, the antioxidant is selected from at least one of phosphites, thioesters, and pyridines. More preferably, the antioxidant is selected from at least one of tris(2,4-di-tert-butylphenyl) phosphite, bis(2,4-dicumylphenyl) pentaerythritol diphosphite, dilauryl thiodipropionate, and bis(2,6-di-tert-butyl-4-methylphenyl) pentaerythritol diphosphate.

[0026] The polychlorotrifluoroethylene film prepared using the film-forming formula described in this invention has a visible light transmittance ≥90% and a water vapor transmittance ≤0.05 g / m². 2 • Day, elongation at break ≥200%.

[0027] Furthermore, the polychlorotrifluoroethylene film prepared using the film-forming formula described in this invention has a visible light transmittance ≥92% and a water vapor transmittance ≤0.03 g / m². 2 • Day, elongation at break ≥240%.

[0028] Thirdly, the present invention also provides an application of a polychlorotrifluoroethylene film, which is used as a photovoltaic encapsulation film, a drug storage or packaging film, or an interior film for buildings, interiors, or vehicles.

[0029] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0030] 1. Adding the fluoropolymer additives described in this invention to polychlorotrifluoroethylene (PTFE) can, on the one hand, utilize the high steric hindrance of the perfluoroepoxy structural unit to de-entangle the polymer chains, and on the other hand, utilize the good compatibility between the PTFE structural unit and PTFE to improve the flowability and plasticization uniformity of PTFE during film processing.

[0031] 2. The melt index of polychlorotrifluoroethylene (PTFE) differs greatly from that of fluoropolymer additives, effectively reducing the average molecular weight and molecular weight distribution of the entire system. This significantly improves the processability of PTFE resin, increasing the processing temperature range from 275–290℃ to 250–290℃, reducing the risk of PTFE degradation, and increasing processing safety.

[0032] 3. By adding fluoropolymer additives to polychlorotrifluoroethylene (PTFE), the amount used is reduced compared to other additives, thereby avoiding the performance degradation caused by the destruction of PTFE regularity. The PTFE film prepared by the film-forming formula of this invention has a visible light transmittance ≥90%, haze ≤10%, and water vapor transmittance ≤0.05 g / m². 2 • After 24 hours, the elongation at break is ≥200%, and the yellowing value after baking in a 275℃ oven for 1 hour is ≤2. Detailed Implementation

[0033] The present invention will be further described below with reference to specific embodiments, but the invention is not limited to these specific embodiments. Those skilled in the art should recognize that the present invention covers all alternatives, improvements, and equivalents that may be included within the scope of the claims.

[0034] Preparation of fluoropolymer auxiliaries

[0035] Example 1

[0036] In a 5L reactor, 3kg of deionized water, 300g of trifluorochloroethylene (CTFE), 160g of perfluoro(2,2-dimethyl)-1,3-dioxane, 7g of hexafluoropropylene oxide trimer ammonium carboxylate, 3g of NH4Ac, and 30g of chloroform were added. The reactor was heated to 60℃, and 4.0g of potassium persulfate (KPS) was added to initiate polymerization. Subsequently, 20g of comonomer was added every 2 hours, and after 8 hours of reaction, the reactor was cooled. The polymer emulsion was first demulsified, and unreacted modified monomers were recovered in the demulsification wastewater. The material was washed and dried to obtain a fluoropolymer auxiliary agent, which was a [perfluoro(2,2-dimethyl)-1,3-dioxane]-CTFE copolymer with a copolymerization ratio of 45 / 55.

[0037] The melt index (275℃, 2.16kg) of the fluoropolymer additive was tested to be 1300g / 10min.

[0038] Example 2

[0039] Same as Example 1, except that the chain transfer agent is 10g chloroform.

[0040] The melt index (2.16 kg at 275℃) of the fluoropolymer additive was tested to be 500 g / 10 min.

[0041] Example 3

[0042] Same as Example 1, except that the chain transfer agent is 18g chloroform.

[0043] The melt index (2.16 kg at 275℃) of the fluoropolymer additive was tested to be 800 g / 10 min.

[0044] Example 4

[0045] Same as Example 1, except that the chain transfer agent is 45g chloroform.

[0046] The melt index (2.16 kg at 275℃) of the fluoropolymer additive was tested to be 2000 g / 10 min.

[0047] Example 5

[0048] Same as Example 1, except that: the initial addition amount of perfluoro(2,2-dimethyl)-1,3-dioxane was 45g, and the fluoropolymer auxiliary was a [perfluoro(2,2-dimethyl)-1,3-dioxane]-CTFE copolymer with a copolymerization ratio of 30 / 70.

[0049] The melt index (275℃, 2.16kg) of the fluoropolymer additive was tested to be 1300g / 10min.

[0050] Example 6

[0051] Same as Preparation Example 1, except that: perfluoro(2,2-dimethyl)-1,3-dioxanepentene was replaced with perfluoropropylene-vinyl ether; the fluoropolymer auxiliaries were obtained as [perfluoropropylene-vinyl ether]-chlorotrifluoroethylene (CTFE) copolymer with a copolymerization ratio of 45 / 55.

[0052] The melt index (275℃, 2.16kg) of the fluoropolymer additive was tested to be 1300g / 10min.

[0053] Comparative Example 1

[0054] 3 kg of deionized water, 300 g of trifluorochloroethylene (CTFE), 160 g of perfluoro(2,2-dimethyl)-1,3-dioxane, 4 g of hexafluoropropylene oxide trimer ammonium carboxylate, and 2 g of NH4Ac were added to a 5 L reactor. The reactor was heated to 60 °C, and 4.0 g of potassium persulfate (KPS) was added to initiate polymerization. Subsequently, 20 g of comonomer was added every 2 hours, and the reaction was carried out for 8 hours. The reactor was then cooled. The polymer emulsion was first demulsified, and unreacted modified monomers were recovered from the demulsification wastewater. The material was washed and dried to obtain a [perfluoro(2,2-dimethyl)-1,3-dioxane]-CTFE copolymer with a copolymerization ratio of 45 / 55.

[0055] The melt index (2.16 kg at 275℃) of the fluoropolymer additive was tested to be 30 g / 10 min.

[0056] Preparation of polychlorotrifluoroethylene film

[0057] Application Example 1

[0058] By weight, 100 parts of polychlorotrifluoroethylene homopolymer resin (melt index (275℃, 2.16 kg) of 2 g / 10 min), 3 parts of [perfluoro(2,2-dimethyl)-1,3-dioxane-pentene]-CTFE copolymer prepared in Example 1 with a copolymerization ratio of 45 / 55 (melt index (275℃, 2.16 kg) of 1300 g / 10 min), and 0.5 parts of antioxidant were added. 9228 was prepared into Resin 1 by blending and granulation;

[0059] Resin 1 is then extruded through a twin-screw extruder at a temperature of 255℃ and a screw speed of 30m / min. The film is then cast through a casting roller at a temperature of 100℃ and a linear speed of 20m / min to obtain a transparent high-barrier fluoropolymer film with a thickness of 25μm, denoted as Film1.

[0060] Application Example 2

[0061] The procedure was the same as in Application Example 1, except that the [perfluoro(2,2-dimethyl)-1,3-dioxane]-CTFE copolymer with a copolymerization ratio of 45 / 55 (melt index (275℃, 2.16 kg) of 500 g / 10 min) prepared in Example 2 was used instead of the [perfluoro(2,2-dimethyl)-1,3-dioxane]-CTFE copolymer with a copolymerization ratio of 45 / 55 prepared in Example 1 (melt index (275℃, 2.16 kg) of 1300 g / 10 min). After blending and granulation, Resin 2 was obtained.

[0062] Resin 2 was then extruded using a twin-screw extruder to obtain a transparent high-barrier fluoropolymer film with a thickness of 25 μm, denoted as Film 2.

[0063] Application Example 3

[0064] The procedure was the same as in Application Example 1, except that the [perfluoro(2,2-dimethyl)-1,3-dioxane]-CTFE copolymer with a copolymerization ratio of 45 / 55 (melt index (275℃, 2.16kg) of 800g / 10min) prepared in Example 3 was used instead of the [perfluoro(2,2-dimethyl)-1,3-dioxane]-CTFE copolymer with a copolymerization ratio of 45 / 55 prepared in Example 1 (melt index (275℃, 2.16kg) of 1300g / 10min). After blending and granulation, Resin 3 was obtained.

[0065] Resin 3 was then extruded using a twin-screw extruder to obtain a transparent high-barrier fluoropolymer film with a thickness of 25 μm, denoted as Film3.

[0066] Application Example 4

[0067] The procedure was the same as in Application Example 1, except that the [perfluoro(2,2-dimethyl)-1,3-dioxane]-CTFE copolymer with a copolymerization ratio of 45 / 55 (melt index (275℃, 2.16 kg) of 2000 g / 10 min) prepared in Example 4 was used instead of the [perfluoro(2,2-dimethyl)-1,3-dioxane]-CTFE copolymer with a copolymerization ratio of 45 / 55 (melt index (275℃, 2.16 kg) of 1300 g / 10 min) prepared in Example 1. After blending and granulation, Resin 4 was obtained.

[0068] Resin 4 was then extruded using a twin-screw extruder to obtain a transparent high-barrier fluoropolymer film with a thickness of 25 μm, denoted as Film 4.

[0069] Application Example 5

[0070] The procedure was the same as in Application Example 1, except that: one part of the [perfluoro(2,2-dimethyl)-1,3-dioxane]-CTFE copolymer (melt index (275℃ 2.16kg) of 1300g / 10min) prepared in Example 1 with a copolymerization ratio of 45 / 55 was blended and granulated to obtain Resin 5.

[0071] Resin 5 was then extruded using a twin-screw extruder to obtain a transparent high-barrier fluoropolymer film with a thickness of 25 μm, denoted as Film 5.

[0072] Application Example 6

[0073] The procedure was the same as in Application Example 1, except that the [perfluoro(2,2-dimethyl)-1,3-dioxane]-CTFE copolymer with a copolymerization ratio of 30 / 70 (melt index (275℃, 2.16 kg) of 1300 g / 10 min) prepared in Example 5 was used instead of the [perfluoro(2,2-dimethyl)-1,3-dioxane]-CTFE copolymer with a copolymerization ratio of 45 / 55 prepared in Example 1 (melt index (275℃, 2.16 kg) of 1300 g / 10 min). After blending and granulation, Resin 6 was obtained.

[0074] Resin 6 was then extruded using a twin-screw extruder to obtain a transparent high-barrier fluoropolymer film with a thickness of 25 μm, denoted as Film 6.

[0075] Application Example 7

[0076] The procedure was the same as in Application Example 1, except that the fluorinated additives (melt index (275℃, 2.16kg) of [perfluoropropylene-vinyl ether]-trifluorochloroethylene (CTFE) copolymer with a copolymerization ratio of 45 / 55 (CTFE) prepared in Example 6, with a melt index (275℃, 2.16kg) of 1300g / 10min) were used instead of the fluorinated additives (perfluoro(2,2-dimethyl)-1,3-dioxane-pentene)-CTFE copolymer with a copolymerization ratio of 45 / 55 prepared in Example 1, CTFE. After blending and granulation, Resin 7 was obtained.

[0077] Resin 7 was then extruded using a twin-screw extruder to obtain a transparent high-barrier fluoropolymer film with a thickness of 25 μm, denoted as Film 7.

[0078] Application Example 8

[0079] The operation is the same as in Application Example 1, except that: Resin 1 is extruded through a single screw extruder at a temperature of 265°C and a screw speed of 35 m / min, and then cast through a casting roller at a temperature of 100°C and a linear speed of 20 m / min to obtain a transparent high-barrier fluoropolymer film with a thickness of 25 μm, which is denoted as Film 8.

[0080] Application Example 9

[0081] The operation is the same as in Application Example 1, except that: polychlorotrifluoroethylene copolymer resin (copolymer ratio of 10 / 90 ethylene-chlorotrifluoroethylene copolymer, melt index (275℃ 2.16kg) of 2g / 10min) is used instead of polychlorotrifluoroethylene homopolymer resin. After blending and granulation, Resin 9 is obtained. The film is then extruded through a twin-screw extruder to obtain a transparent high-barrier fluoropolymer film with a thickness of 25μm, denoted as Film 9.

[0082] Comparative Application Example 1

[0083] Mix 100 parts of polychlorotrifluoroethylene resin and 1 part of antioxidant. 9228 was prepared into Resin10 by blending and granulation; then Resin 10 was extruded through a screw extruder, but the resin scorched and could not produce a transparent polymer film.

[0084] Comparative Application Example 2

[0085] Mix 100 parts of polychlorotrifluoroethylene resin (melt index (275℃, 2.16kg) of 2 g / 10min), 3 parts of vinylidene fluoride-chlorotrifluoroethylene copolymer (melt index (275℃, 2.16kg) of 1300 g / 10min), and 0.5 parts of antioxidant. 9228 was prepared into Resin 11 through blending and granulation;

[0086] Resin 11 was then extruded using a twin-screw extruder at a temperature of 280°C and then cast using a casting roller at a temperature of 100°C to obtain a transparent high-barrier fluoropolymer film with a thickness of 25μm, denoted as Film 11.

[0087] Comparative Application Example 3

[0088] 100 parts of polychlorotrifluoroethylene resin (melt index (275℃, 2.16 kg) of 2 g / 10 min), 3 parts of [perfluoro(2,2-dimethyl)-1,3-dioxanepentene]-CTFE copolymer with a copolymer ratio of 45 / 55 prepared in Comparative Example 1 (melt index (275℃, 2.16 kg) of 30 g / 10 min), and 0.5 parts of antioxidant were mixed. 9228 was prepared into Resin 12 through blending and granulation;

[0089] Resin 12 was then extruded using a twin-screw extruder at a temperature of 280°C and then cast using a casting roller at a temperature of 100°C to obtain a transparent high-barrier fluoropolymer film with a thickness of 25μm, denoted as Film 12.

[0090] The films prepared in Application Examples 1 to 9 and Comparative Application Examples 1 to 3 were subjected to performance tests, and the test results are shown in Table 1 below.

[0091] Melt flow index test method: 2.16 kg at 275℃.

[0092] The test method for visible light transmittance shall be in accordance with GB2410-2008.

[0093] The test method for yellowing value YIE313 shall be carried out in accordance with GB / T3979.

[0094] The test method for water vapor transmission rate shall be carried out in accordance with GB / T 26253.

[0095] The tensile strength and elongation at break tests were performed in accordance with ASTM D882.

[0096] Table 1. Thin film performance test results

[0097]

[0098]

[0099] The comparison shows that the melt flow index and film properties of Application Examples 1-9 are superior to those of Comparative Application Examples 1-3, indicating that the fluoropolymer additives described in the patent can effectively improve the processing fluidity of polychlorotrifluoroethylene resin, while ensuring that the prepared film does not lose its water vapor barrier properties (water vapor permeability ≤ 0.03 g / m). 2(24h) further improves the optical properties of the prepared thin film (visible light transmittance ≥92%, haze ≤10%).

Claims

1. A fluoropolymer additive, characterized in that: The fluoropolymer additive is a copolymer of trifluorochloroethylene and perfluoro(2,2-dimethyl)-1,3-dioxane or perfluoropropylene-vinyl ether. The fluoropolymer additive contains 30-70 mol% of perfluoro(2,2-dimethyl)-1,3-dioxane or perfluoropropylene-vinyl ether structural units. The melt index of the fluoropolymer additive at 275°C and 2.16 kg is 500–2000 g / 10 min.

2. The fluoropolymer additive according to claim 1, characterized in that: The melt index of the fluoropolymer additive at 275°C and 2.16 kg is 800–1500 g / 10 min.

3. A film-forming formula for polychlorotrifluoroethylene film, characterized in that: The film-forming formulation comprises the fluoropolymer additives as described in any one of claims 1-2.

4. The film-forming formula of the polychlorotrifluoroethylene film according to claim 3, characterized in that: The film-forming formulation comprises the following components in parts by weight: 100 parts of polychlorotrifluoroethylene; 1 to 10 parts of the fluoropolymer additive; 0.1 to 1 part antioxidant.

5. The film-forming formula of the polychlorotrifluoroethylene film according to claim 4, characterized in that: The polychlorotrifluoroethylene is a homopolymer or copolymer of chlorotrifluoroethylene; when the polychlorotrifluoroethylene is a copolymer of chlorotrifluoroethylene, the content of chlorotrifluoroethylene structural units is 90-99.5 mol%.

6. The film-forming formula of the polychlorotrifluoroethylene film according to claim 4, characterized in that: The melt index of the polychlorotrifluoroethylene at 275℃ and 2.16kg is 0.5~5g / 10min.

7. The film-forming formula of the polychlorotrifluoroethylene film according to claim 4, characterized in that: The film-forming formulation comprises the following components in parts by weight: 100 parts of polychlorotrifluoroethylene; 2 to 4 parts of the fluoropolymer additive; 0.3 to 0.6 parts antioxidant.

8. The film-forming formula of the polychlorotrifluoroethylene film according to claim 4, characterized in that: The antioxidant is selected from at least one of tris(2,4-di-tert-butylphenyl) phosphite, bis(2,4-dicumylphenyl) pentaerythritol diphosphite, dilauryl thiodipropionate, and bis(2,6-di-tert-butyl-4-methylphenyl) pentaerythritol diphosphate.

9. An application of the polychlorotrifluoroethylene film according to any one of claims 3-8, characterized in that: The polychlorotrifluoroethylene film is used as a photovoltaic encapsulation film, a drug storage or packaging film, and a building, interior, or vehicle interior film.

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