PVC resins, methods of making and using the same, and PVC film raw material compositions and PVC films and methods of making the same

Abstract

The present application relates to the field of synthetic resin preparation, in particular to a PVC resin, a preparation method and application thereof, a PVC film raw material composition, a PVC film and a preparation method thereof; the PVC resin comprises: a structural unit a provided by vinyl chloride, a structural unit b provided by isohexyl acrylate and a structural unit c provided by ethoxylated trimethylolpropane triacrylate; the PVC resin in the present application is grafted and copolymerized by isohexyl acrylate, ethoxylated trimethylolpropane triacrylate and vinyl chloride monomer, and a dense three-dimensional network structure is formed; the dense three-dimensional network structure can form a suitable roughness on the surface of a film product, which is beneficial to the adhesion of the film and a rubber coating layer; when used for preparing a PVC film, the PVC film has good cold resistance and is suitable for being used in cold regions for packaging films and rubber-coated packaging.

Description

Technical Field

[0001] This invention relates to the field of synthetic resin preparation, specifically to a PVC resin, its preparation method and application, as well as a PVC film raw material composition and a PVC film and its preparation method. Background Technology

[0002] PVC film has advantages such as flexibility, wear resistance, high mechanical properties, ease of processing, and cost-effectiveness, and is widely used in offices, packaging, and coating applications. However, PVC film has poor cold resistance, a smooth surface, and it is difficult for the adhesive layer to form a strong adhesion with the PVC film.

[0003] CN201680077897.5 discloses a composition for roughening resin surfaces, providing a means to achieve a surface roughening method by adding and post-processing a resin composition that is simpler than before. The surface roughening method is used to modify the surface layer of a resin molded body to form a surface layer such as a coating or plating, or to exhibit functions derived from the surface shape. The composition contains an aliphatic polycarbonate and an alkali metal compound, wherein the alkali metal compound is at least one selected from the group consisting of alkali metal hydroxides, alkali metal carbonates, and alkali metal carboxylates. Summary of the Invention

[0004] The purpose of this invention is to overcome the problems of poor cold resistance, smooth surface, and difficulty in forming strong adhesion between the coating layer and the PVC film in the existing technology. This invention provides a PVC resin, its preparation method and application, as well as a PVC film raw material composition and a PVC film and its preparation method. The obtained PVC film has the advantages of good cold resistance and suitable surface roughness for coating, making it suitable for packaging films and coated packaging in cold regions.

[0005] Based on existing literature, PVC films are currently mainly prepared using casting, blow molding, and calendering methods, each with its own advantages and disadvantages. Casting easily degrades PVC materials, while blow molding produces PVC films with poor thickness uniformity, and flexible products are prone to film breakage. Calendering requires high equipment investment, and adjusting the thickness uniformity of the finished product is quite complicated.

[0006] This invention is the first to propose the use of isodecyl acrylate, trimethylolpropane triacrylate ethoxylate and vinyl chloride monomer graft copolymerization to form a dense three-dimensional network structure. This dense three-dimensional network structure can form a suitable roughness on the surface of the film product, which is beneficial to the adhesion of the film and the coating layer.

[0007] Furthermore, this invention aims to improve the cold resistance of PVC film by grafting and copolymerizing isodecaacrylate, trimethylolpropane triacrylate, and vinyl chloride to form a soft molecular chain, enabling the film to be used in cold environments. The resulting PVC resin has a surface roughness suitable for coating and can be used for packaging films and coated packaging in cold regions.

[0008] To achieve the above objectives, the present invention provides a PVC resin comprising: a structural unit a provided by vinyl chloride, a structural unit b provided by isodecanyl acrylate, and a structural unit c provided by ethoxytrimethylolpropane triacrylate.

[0009] A second aspect of the present invention provides a method for preparing the PVC resin described herein, the method comprising:

[0010] In the presence of an initiator, isodecanyl acrylate, ethoxytrimethylolpropane triacrylate, and vinyl chloride are copolymerized.

[0011] A third aspect of the present invention provides the application of the PVC resin described herein in film preparation.

[0012] A fourth aspect of the present invention provides a PVC film raw material composition comprising the PVC resin described herein.

[0013] The fifth aspect of the present invention provides a method for preparing a PVC resin film, the method comprising: molding a PVC film raw material composition, wherein the PVC film raw material composition includes the composition described in the present invention.

[0014] Through the above technical solution, the present invention has the following beneficial effects:

[0015] The PVC resin of this invention contains structural unit a provided by vinyl chloride, structural unit b provided by isodecanyl acrylate, and structural unit c provided by ethoxytrimethylolpropane triacrylate. The PVC film prepared therefrom has the advantages of good cold resistance and suitable surface roughness for coating, making it suitable for packaging films and coated packaging in cold regions. Detailed Implementation

[0016] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0017] This invention provides a PVC resin comprising: structural unit a provided by vinyl chloride, structural unit b provided by isodecanyl acrylate, and structural unit c provided by ethoxytrimethylolpropane triacrylate. PVC films prepared from the PVC resin of this invention have the advantages of good cold resistance and suitable surface roughness for coating, making them suitable for packaging films and coated packaging in cold regions.

[0018] In this invention, the structural formula of isodecyl acrylate is as follows:

[0019]

[0020] In this invention, structural unit b is formed by opening the olefin bond in isodecyl acrylate.

[0021] In this invention, the structural formula of ethoxylated trimethylolpropane triacrylate is as follows:

[0022]

[0023] In this invention, structural unit c is formed by opening the olefin bonds in ethoxylated trimethylolpropane triacrylate under copolymerization conditions and connecting them together with other structural units.

[0024] According to a preferred embodiment of the present invention, the mass of structural unit b provided by isodecyl acrylate in the PVC resin is 0.2-0.4 wt% of the mass of vinyl chloride monomer, based on 100 wt% of vinyl chloride monomer.

[0025] According to a preferred embodiment of the present invention, based on 100 wt% of vinyl chloride monomer, the mass of structural unit c provided by ethoxylated trimethylolpropane triacrylate in the PVC resin is 0.2-0.4 wt% of the mass of vinyl chloride monomer.

[0026] In this invention, the PVC resin has a three-dimensional network structure, which can form a suitable roughness on the surface of the film product, which is conducive to the adhesion of the film and the coating layer.

[0027] Resins possessing the aforementioned characteristics of this invention can all be used in this invention, and there are no special requirements for their preparation methods. In view of this invention, a method for preparing PVC resin is provided, the method comprising: copolymerizing isodecanyl acrylate, ethoxytrimethylolpropane triacrylate, and vinyl chloride in the presence of an initiator.

[0028] In this invention, the copolymerization method has no special requirements. According to a preferred embodiment of the invention, the copolymerization method includes: mixing deionized water, isodecanyl acrylate, ethoxytrimethylolpropane triacrylate, dispersant, initiator, and vinyl chloride for copolymerization, then adding a terminator to terminate the reaction, separating the solid and liquid, and drying. Preferably, the method includes: (a) mixing deionized water, isodecanyl acrylate, ethoxytrimethylolpropane triacrylate, dispersant, and initiator; (b) adding vinyl chloride to the mixed material for copolymerization; and (c) adding a terminator to terminate the reaction after copolymerization, separating the solid and liquid, and drying.

[0029] In this invention, the solid-liquid separation in step (c) is centrifugal dehydration, which can be carried out with reference to existing technology, and will not be described in detail here.

[0030] In this invention, the drying conditions in step (c) are carried out in an oven at 50-80°C, which can be done with reference to existing technology.

[0031] In this invention, the amounts of isodecanyl acrylate, ethoxytrimethylolpropane triacrylate, and vinyl chloride monomer can be selected according to the required content of structural unit a, structural unit b, and structural unit c in the PVC resin.

[0032] In this invention, the isodecyl acrylate and ethoxytrimethylolpropane triacrylate can synergistically form a dense three-dimensional network structure with vinyl chloride monomer. This dense three-dimensional network structure can create a suitable roughness on the surface of the film product, which is beneficial to the adhesion of the film and the coating layer.

[0033] In this invention, there are no special requirements for the mass ratio of the deionized water to the total mass of isodecyl acrylate, ethoxytrimethylolpropane triacrylate, and vinyl chloride monomer, as long as the aqueous suspension copolymerization reaction can proceed smoothly.

[0034] According to a preferred embodiment of the present invention, the mass ratio of the water to the total mass of isodecyl acrylate, trimethylolpropane triacrylate ethoxylate, and vinyl chloride monomer is (1.4-2.1):1. By adopting the aforementioned preferred embodiment, a dense three-dimensional network structure can be formed. When used in the preparation of PVC films, the cold resistance of PVC lift-up films can be improved, enabling the films to be used in cold environments.

[0035] According to a preferred embodiment of the present invention, the mass of the dispersant is 0.09-0.14 wt% of the mass of vinyl chloride.

[0036] According to a preferred embodiment of the present invention, the initiator is used in an amount of 0.05-0.07 wt% of the amount of vinyl chloride.

[0037] By adopting the aforementioned preferred embodiments, a suitable roughness can be formed on the surface of the film product, which is beneficial to the adhesion of the film and the coating layer.

[0038] In this invention, the dispersant has no special requirements. According to a preferred embodiment of the invention, the dispersant comprises at least one selected from polyvinyl alcohol dispersants, cellulose ethers, fatty alcohol polyoxyethylene ethers, gelatin, and alkylphenol polyoxyethylene ethers, preferably a mixture of polyvinyl alcohol dispersants and cellulose ethers, and more preferably a mass ratio of polyvinyl alcohol dispersant to cellulose ether of (0.91-1.43):(0.26-0.39). By adopting the aforementioned preferred embodiment, a suitable roughness can be formed on the surface of the film product, which is beneficial to the adhesion of the film to the coating layer.

[0039] In this invention, the polyvinyl alcohol dispersant has no special requirements. According to a preferred embodiment of the invention, the polyvinyl alcohol dispersant is selected from at least one of KH-20, L-9, S202, L-11, L-0, and 420, preferably a mixture of KH-20, L-9, and S202. More preferably, the mass ratio of KH-20, L-9, and S202 in the mixture is (0.13-0.26):(0.52-0.78):(0.26-0.39). By adopting the aforementioned preferred embodiment, a suitable roughness can be formed on the surface of the film product, which is beneficial to the adhesion of the film to the coating layer.

[0040] In this invention, there are no special requirements for the cellulose ether. According to a preferred embodiment of the invention, the cellulose ether is preferably a modified cellulose ether, selected from at least one of E50 and FON50. In this invention, E50 is used as an example in the embodiments, but the invention is not limited to this scope. By adopting the aforementioned preferred embodiment, a suitable roughness can be formed on the surface of the film product, which is beneficial to the adhesion of the film to the coating layer.

[0041] In this invention, the initiator has no special requirements. According to a preferred embodiment of the invention, the initiator is selected from at least one of azobisisobutyronitrile, diisobutyryl peroxide, cumyl peroxyneodecanate, bis(2-ethylhexyl) percarbonate, and tert-pentyl peroxyneodecanate, preferably one or two of cumyl peroxyneodecanate and bis(2-ethylhexyl) percarbonate; more preferably a mixture of cumyl peroxyneodecanate and bis(2-ethylhexyl) percarbonate; and more preferably, the mass ratio of cumyl peroxyneodecanate to bis(2-ethylhexyl) percarbonate in the mixture is (0.52-0.65):(0.13-0.26). By adopting the aforementioned preferred embodiment, a suitable roughness can be formed on the surface of the film product, which is beneficial to the adhesion of the film to the coating layer.

[0042] In this invention, the terminator has no special requirements. According to a preferred embodiment of the invention, the terminator is selected from at least one of ATSC, DEHA, and bisphenol A. In this invention, DEHA is used as an example in the embodiments, but the invention is not limited to this scope. By adopting the aforementioned preferred embodiments, the termination efficiency and the non-toxicity of the operating environment can be further improved.

[0043] In this invention, a terminator is added to terminate the reaction when the pressure inside the reactor drops by 0.14 MPa from the highest pressure value.

[0044] In this invention, there are no special requirements for the mixing conditions in step (a), as long as the purpose of this invention is achieved.

[0045] According to a preferred embodiment of the present invention, the mixing temperature is 15-25°C.

[0046] According to a preferred embodiment of the present invention, the mixing time is 10-30 min.

[0047] By adopting the aforementioned preferred embodiments, a suitable roughness can be formed on the surface of the film product, which is beneficial to the adhesion of the film and the coating layer.

[0048] In this invention, there are no special requirements for the copolymerization reaction conditions, as long as the purpose of this invention is achieved.

[0049] According to a preferred embodiment of the present invention, the copolymerization temperature is 51-53°C.

[0050] According to a preferred embodiment of the present invention, the copolymerization pressure is 0.860-0.875 MPa.

[0051] According to a preferred embodiment of the present invention, the copolymerization time is 300-490 min.

[0052] By employing the aforementioned preferred embodiments, the surface of the membrane product can be formed with a suitable roughness, which is beneficial for the adhesion of the membrane to the coating layer.

[0053] This invention provides the application of the PVC resin described herein in film preparation.

[0054] The present invention provides a PVC film raw material composition comprising the PVC resin described herein.

[0055] According to a preferred embodiment of the present invention, the raw material composition contains: PVC resin, stabilizer, plasticizer and lubricant.

[0056] According to a preferred embodiment of the present invention, the mass ratio of the PVC resin, stabilizer, plasticizer and lubricant is 100:(5.0-7.0):(30-50):(5-10):(0.2-0.4).

[0057] According to a preferred embodiment of the present invention, the stabilizer is exemplified by a calcium-zinc heat stabilizer, but the present invention is not limited to this scope.

[0058] According to a preferred embodiment of the present invention, the plasticizer is a DOP plasticizer and / or a DOS plasticizer.

[0059] According to a preferred embodiment of the present invention, the lubricant used in the examples is oxidized polyethylene wax, but the present invention is not limited to this scope.

[0060] By adopting the aforementioned preferred embodiments, a suitable roughness can be formed on the surface of the film product, which is beneficial to the adhesion of the film and the coating layer.

[0061] This invention provides a method for preparing a PVC film, the method comprising: molding a PVC film raw material composition, wherein the PVC film raw material composition includes the composition described in this invention.

[0062] According to a preferred embodiment of the present invention, the embrittlement temperature of the film is 35-40°C.

[0063] According to a preferred embodiment of the present invention, the thickness of the membrane is 0.7-1 μm.

[0064] The present invention will be described in detail below through embodiments.

[0065] In this embodiment of the invention, the materials were accurately weighed according to the formula in Table 1, and the materials in the comparative example were accurately weighed according to the formula in Table 2. The polymerization reaction pressure was 0.87 MPa and the time was 400 min.

[0066] Preparation of PVC resin: First, deionized water, isodecyl acrylate (ISODA), ethoxylated trimethylolpropane triacrylate, four dispersants, and two initiators are added to a 5-liter polymerization reactor and stirred at room temperature (20°C) for 20 minutes. Then, vinyl chloride monomer is added and stirred for 15 minutes. The temperature is raised to 53°C to start the polymerization reaction. When the pressure inside the reactor drops from the highest pressure value to 0.14 MPa, a terminator is added to terminate the reaction. The material is discharged into a centrifuge for dehydration, and the dehydrated wet material is dried in a 60°C oven.

[0067] Preparation of PVC resin film: Mix 100 parts of the resin with 6 parts of calcium zinc heat stabilizer (RUP-129C), 40 parts of plasticizer DOP, 10 parts of plasticizer DOS, 0.3 parts of oxidized polyethylene wax (AC-6A) and lubricant (OPE Wax OA2) until homogeneous.

[0068] Test method: The composition was rolled into sheets using a two-roll mill. The sheets were then molded into soft sheets with a thickness of 1.6 mm using a hot molding press. Samples were prepared on the sheets for testing the low-temperature embrittlement temperature according to GB / T 5470-2008. The composition was calendered to obtain a 70 μm thick film. Samples were taken from the film for surface roughness performance testing. Surface roughness was measured using a roughness tester and expressed as the arithmetic mean deviation Ra of the profile. The test results for low-temperature embrittlement temperature and roughness are shown in Table 3.

[0069] Example 1

[0070] Weigh the materials according to the composition in Table 1. By mass, the following components are present: vinyl chloride monomer 1300g, deionized water 1956g, isodecyl acrylate (ISODA) 2.6g, trimethylolpropane triacrylate (2OEO) 2.6g, four dispersants (KH-20 0.13g, L-9 0.52g, E50 0.26g, S202 0.26g), and two initiators (cumyl peroxide neodecanoate (CNP) 0.52g, bis(2-ethylhexyl) peroxide dicarbonate (EHP) 0.13g). The test results are shown in Table 3.

[0071] Example 2

[0072] Weigh the materials according to the composition in Table 1. By mass, the following components are present: vinyl chloride monomer 1300g, deionized water 2615g, isodecyl acrylate (ISODA) 5.2g, ethoxylated trimethylolpropane triacrylate (2OEO) 5.2g, four dispersants (KH-20 0.26g, L-9 0.78g, E50 0.39g, S202 0.39g), and two initiators (cumyl peroxide neodecanoate (CNP) 0.65g, bis(2-ethylhexyl) peroxide dicarbonate (EHP) 0.26g). The test results are shown in Table 3.

[0073] Example 3

[0074] Weigh the materials according to the composition in Table 1. By mass, the following components are present: vinyl chloride monomer 1300g, deionized water 2259g, isodecyl acrylate (ISODA) 3.9g, trimethylolpropane triacrylate (2OEO) 3.9g, four dispersants (KH-20 0.2g, L-9 0.63g, E50 0.32g, S202 0.32g), and two initiators (cumyl peroxide neodecanoate (CNP) 0.59g, bis(2-ethylhexyl) peroxide dicarbonate (EHP) 0.21g). The test results are shown in Table 3.

[0075] Example 4

[0076] The material composition and preparation method provided in this embodiment are the same as in Embodiment 1, except that: based on 100wt% of vinyl chloride monomer, the mass of the isodecyl acrylate ISODA structural unit b is 2g, which is not within the scope of this invention. Test results are shown in Table 3.

[0077] Example 5

[0078] The material composition and preparation method provided in this embodiment are the same as in Embodiment 1, except that: based on 100wt% of vinyl chloride monomer, the mass of structural unit c provided by ethoxylated trimethylolpropane triacrylate is 2g, which is not within the scope of this invention. Test results are shown in Table 3.

[0079] Example 6

[0080] The material composition and preparation method provided in this embodiment are the same as in Example 1. By mass, the composition includes 1300g vinyl chloride monomer, 3000g deionized water, 2.6g isodecanyl acrylate (ISODA), 2.6g trimethylolpropane triacrylate (2OEO), four dispersants (KH-20 0.13g, L-9 0.52g, E50 0.26g, S202 0.26g), and two initiators (cumyl peroxyneodecanoate (CNP) 0.52g, bis(2-ethylhexyl) peroxydicarbonate (EHP) 0.13g). The test results are shown in Table 3.

[0081] Example 7

[0082] The material composition and preparation method provided in this embodiment are the same as in Example 1. By mass, the composition includes 1300g vinyl chloride monomer, 1956g deionized water, 2.6g isodecanyl acrylate (ISODA), 2.6g trimethylolpropane triacrylate (2OEO), four dispersants (KH-20 0.13g, L-9 0.52g, E50 0.52g, S202 0.13g), and two initiators (cumyl peroxyneodecanoate (CNP) 0.52g, bis(2-ethylhexyl) peroxydicarbonate (EHP) 0.13g). The test results are shown in Table 3.

[0083] Example 8

[0084] The material composition and preparation method provided in this embodiment are the same as in Example 1. By mass, the composition includes 1300g vinyl chloride monomer, 1956g deionized water, 2.6g isodecanyl acrylate (ISODA), 2.6g trimethylolpropane triacrylate (2OEO), four dispersants (KH-20 0.13g, L-9 0.26g, E50 0.26g, S202 0.52g), and two initiators (cumyl peroxynedecanoate (CNP) 0.52g, bis(2-ethylhexyl) peroxydicarbonate (EHP) 0.13g). The test results are shown in Table 3.

[0085] Comparative Example 1

[0086] The material composition and preparation method provided in this comparative example are the same as in Example 1. The material components were weighed according to the table in Table 2. The difference is that structural unit b is provided by tricyclodecanediethanol diacrylate with a mass of 3.9 g, and structural unit c is provided by dicyclopentenyl acrylate with a mass of 3.9 g. The test results are shown in Table 3.

[0087] Comparative Example 2

[0088] The material composition and preparation method provided in this comparative example are the same as in Example 1. The material composition was weighed according to Table 2. The difference is that structural unit b is provided by tricyclodecanediethanol diacrylate, with a mass of 3.9g. At the same time, structural unit c is not provided. The test results are shown in Table 3.

[0089] Comparative Example 3

[0090] The material composition and preparation method provided in this comparative example are the same as in Example 1. The material composition was weighed according to Table 2. The difference is that structural unit c is provided by dicyclopentenyl acrylate, with a mass of 3.9 g, and structural unit b is not provided. The test results are shown in Table 3.

[0091] Table 1

[0092]

[0093] Table 2

[0094]

[0095] Table 3

[0096]

[0097] As can be seen from the examples and comparative examples, isodecyl acrylate (ISODA) and ethoxytrimethylolpropane triacrylate (2OEO) have a synergistic effect in improving the cold resistance and surface roughness of PVC resin. Analysis of the comparative example data shows that tricyclodecanediethanol diacrylate and dicyclopentenyl acrylate do not exhibit the same synergistic effect as isodecyl acrylate (ISODA) and ethoxytrimethylolpropane triacrylate (2OEO).

[0098] The preferred embodiments of the present invention have been described in detail above; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various technical features in any other suitable manner. These simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A PVC resin, characterized in that, The resin comprises: structural unit a provided by vinyl chloride, structural unit b provided by isodecanyl acrylate, and structural unit c provided by ethoxytrimethylolpropane triacrylate; Based on 100wt% of vinyl chloride monomer, The mass of structural unit b is 0.2-0.4 wt% of the mass of vinyl chloride monomer; The mass of structural unit c is 0.2-0.4 wt% of the mass of vinyl chloride monomer; The resin has a three-dimensional network structure.

2. A method for preparing the PVC resin according to claim 1, characterized in that, The method includes: In the presence of an initiator, isodecanyl acrylate, ethoxytrimethylolpropane triacrylate, and vinyl chloride are copolymerized.

3. The preparation method according to claim 2, wherein, The methods of copolymerization include: After copolymerizing deionized water, isodecanyl acrylate, ethoxytrimethylolpropane triacrylate, dispersant, initiator, and vinyl chloride, a terminator is added to terminate the reaction, followed by solid-liquid separation and drying.

4. The preparation method according to claim 3, wherein, The method includes: (a) Mix deionized water, isodecanyl acrylate, ethoxylated trimethylolpropane triacrylate, dispersant, and initiator; (b) Add vinyl chloride to the mixed material to carry out a copolymerization reaction; (c) After copolymerization, a terminator is added to terminate the reaction, followed by solid-liquid separation and drying.

5. The preparation method according to claim 4, wherein, The ratio of the mass of deionized water used to the total mass of isodecyl acrylate, trimethylolpropane triacrylate ethoxylate, and vinyl chloride monomer used is (1.4-2.1):1; and / or The dispersant is used in an amount of 0.09-0.14 wt% of the amount of vinyl chloride; and / or The initiator is used in an amount of 0.05-0.07 wt% of the amount of vinyl chloride.

6. The preparation method according to any one of claims 3-5, wherein, The dispersant comprises at least one of polyvinyl alcohol dispersants, cellulose ethers, fatty alcohol polyoxyethylene ethers, gelatin, and alkylphenol polyoxyethylene ethers; and / or The initiator is selected from at least one of azobisisobutyronitrile, diisobutyryl peroxide, cumyl peroxyneodecanate, bis(2-ethylhexyl) peroxydicarbonate, and tert-pentyl peroxyneodecanate.

7. The preparation method according to claim 6, wherein, The dispersant is a mixture of polyvinyl alcohol dispersants and cellulose ethers; and / or The initiator is one or both of cumene peroxynedecanoate and bis(2-ethylhexyl) peroxydicarbonate.

8. The preparation method according to claim 7, wherein, The mass ratio of polyvinyl alcohol dispersants to cellulose ethers is (0.91-1.43):(0.26-0.39); and / or The initiator is a mixture of cumene peroxyneodecanate and bis(2-ethylhexyl) peroxydicarbonate.

9. The preparation method according to claim 8, wherein, The mass ratio of cumyl peroxyneodecanate to bis(2-ethylhexyl) peroxydicarbonate in the mixture is (0.52-0.65):(0.13-0.26).

10. The preparation method according to claim 6, wherein, The polyvinyl alcohol dispersant is selected from at least one of KH-20, L-9, S202, L-11 and 420; and / or The cellulose ethers are selected from at least one of E50 and FON50.

11. The preparation method according to claim 10, wherein, The polyvinyl alcohol dispersant is a mixture of KH-20, L-9 and S202.

12. The preparation method according to claim 11, wherein, The mass ratio of KH-20, L-9 and S202 in the mixture is (0.13-0.26):(0.52-0.78):(0.26-0.39).

13. The preparation method according to claim 4, wherein, The mixing conditions in step (a) include: The temperature is 15-25℃; and / or The time is 10-30 minutes; and / or The copolymerization reaction conditions include: The temperature is 51-53℃; and / or The pressure is 0.860-0.875 MPa; and / or The time is 300-490 minutes.

14. The application of the PVC resin according to claim 1 in membrane preparation.

15. A PVC film raw material composition, characterized in that, The raw material composition comprises the PVC resin as described in claim 1.

16. The PVC film raw material composition according to claim 15, wherein, The raw material composition contains: PVC resin, stabilizer, plasticizer and lubricant.

17. The PVC film raw material composition according to claim 16, wherein, The mass ratio of the PVC resin, stabilizer, plasticizer and lubricant is 100:(5.0-7.0):(30-50):(5-10):(0.2-0.4).

18. The PVC film raw material composition according to claim 16 or 17, wherein, The plasticizer is DOP plasticizer and / or DOS plasticizer.

19. A method for preparing a PVC film, characterized in that, The method includes molding a PVC film raw material composition, wherein the PVC film raw material composition comprises the composition according to any one of claims 15-18.

20. The PVC film prepared by the method of claim 19.

21. The PVC film according to claim 20, wherein, The embrittlement temperature of the membrane is 35-40℃; and / or The thickness of the membrane is 0.7-1 μm.

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