Solar backboard base film and production process thereof

Abstract

The invention belongs to the technical field of base film products, and provides a solar backboard base film and a production process thereof. The material is prepared from the following raw materials in parts by weight: 25-70 parts of a block copolymer, 30-50 parts of a thermoplastic elastomer blend, 5-15 parts of a catalyst, 1-10 parts of insulating oil and 10-20 parts of an inorganic material, the preparation process of the solar backboard base membrane comprises the steps of S1, preparing standby slurry, S2, esterifying, S3, polycondensing and S4, preparing the membrane. Compared with the prior art, the base film is prepared by adding the insulating oil, so that the defect that the base film has a micro-pore structure in the prior art can be overcome, the internal structure of the existing base film is changed, gaps among a plurality of molecular groups of the internal structure are smaller, permeation of substances such as water vapor is prevented, the breakdown voltage of the solar back plate base film can be improved, and the service life of the solar back plate is prolonged. The electrical performance can be further improved, and high reliability and safety guarantee are achieved in the using process; the electric insulation property and the steam barrier property are excellent.

Description

Technical Field

[0001] The present invention belongs to the technical field of base film products, and in particular relates to a solar back panel base film and a production process thereof. Background Art

[0002] The solar backsheet is an important component of solar cells, playing the role of insulation, protection and support. Since the backsheet is in direct contact with the external environment, the service life of the backsheet directly determines the service life of the solar cell. Therefore, solar cells have strict technical requirements for the thickness, tensile strength, elongation at break, weather resistance and other performance indicators of the backsheet.

[0003] In the related prior art, for example, an invention patent application in China discloses a solar back panel and a preparation method thereof, and the publication number is CN104143578A. The technical solution recorded in the patent application is "a solar back panel, which includes a base film layer, a weather-resistant layer and a reflective layer located on opposite sides of the base film layer, and two adhesive layers for respectively bonding the weather-resistant layer and the reflective layer to the base film layer, characterized in that: the base film layer is a polypropylene alloy layer; the weather-resistant layer is a polyamide material layer, and the surface of the weather-resistant layer contains a convex structure to increase the solar back panel. Thermal radiation makes the solar back panel have excellent heat dissipation and cooling performance; the reflective layer is a polyolefin material layer; the adhesive layer is an ethylene copolymer containing epoxy groups or an alloy of an ethylene copolymer. ", the patent claims that the polypropylene alloy layer is used to replace the PET polyester layer of the traditional back panel, which has better hydrolysis resistance and aging resistance; polyamide is used to replace the fluoroplastic film of the traditional back panel, which reduces the cost and can reduce environmental pollution; however, in actual application, it is found that the breakdown voltage capability of the existing solar back panel base film is poor, which will invisibly reduce its reliability and safety. Summary of the invention

[0004] In view of the above problems existing in the prior art, an object of the present invention is to provide a solar backplane base film and a production process thereof, which have the advantage of being able to improve the breakdown voltage capability of the solar backplane base film.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] A solar back sheet base film, characterized in that it is made of the following raw materials in percentage: 25-70 parts of block copolymer, 30-50 parts of thermoplastic elastomer blend, 5-15 parts of catalyst, 1-10 parts of insulating oil and 10-20 parts of inorganic material;

[0007] wherein the block copolymer comprises at least one of a styrenic resin, a copolyester, a polyurethane or a polyamide; and the thermoplastic elastomer blend comprises at least one of a thermoplastic polyolefin or a thermoplastic vulcanizate;

[0008] The molar ratio of the block copolymer, the thermoplastic elastomer blend and the inorganic material is (2.0-3.5):1:(0.5-1.5), the added amount of the catalyst accounts for 0.05-0.08wt% of the total mass of the block copolymer, the thermoplastic elastomer blend and the inorganic material; the added amount of the insulating oil accounts for 0.01-0.1wt% of the total mass of the block copolymer, the thermoplastic elastomer blend and the inorganic material; the inorganic material is 0.6-0.8μm titanium dioxide, and the catalyst is an antimony trioxide preparation;

[0009] The solar back panel base film preparation process includes:

[0010] S1: preparing a slurry for standby use: mixing the block copolymer and the thermoplastic elastomer blend evenly to prepare a slurry; firstly mixing the inorganic material with ethanol, and then stirring, while aerating water vapor by aeration, and then grinding, centrifuging, and dehydrating to obtain an inorganic material dispersion with a mass fraction of 30-50wt%;

[0011] S2 esterification: the slurry, catalyst and insulating oil are mixed, the heating temperature K1 is in the range of 280-350°C, the reaction pressure N1 is in the range of 210-270kPa, the reaction time T1 is in the range of 2-3.5h, and after the reaction is completed, the inorganic material dispersion is added to obtain a mixture A;

[0012] S3 polycondensation: using a heater to heat the mixture A to a temperature K2 in the range of 200-255°C, a reaction pressure N2 in the range of 35-45 kPa, and a reaction time T2 in the range of 0.5-1.5 h, to obtain a mixture B;

[0013] S4 film making: the mixed material B is heated to a temperature K3 in the range of 300-355°C, a reaction pressure N3 in the range of 100-200Pa, a reaction time T3 in the range of 4-7h, and then immersed in insulating oil under a vacuum environment for 3-8h; and then through casting, longitudinal drawing, transverse drawing, corona, heat setting, winding and cooling molding, the solar backplane base film can be obtained.

[0014] As a further preferred technical solution of the present invention, the block copolymer comprises 37 parts, the thermoplastic elastomer blend comprises 40 parts, the catalyst comprises 5 parts, the insulating oil comprises 8 parts and the inorganic material comprises 10 parts.

[0015] As a further preferred technical solution of the present invention, the thickness of the solar back panel base film ranges from 188 to 350 um, the width ranges from 500 to 1600 mm, the roll diameter ranges from 320 to 720 mm, and the roll core diameter ranges from 3° to 6°.

[0016] As a further preferred technical solution of the present invention, the molar ratio of the block copolymer, the thermoplastic elastomer blend and the inorganic material is 2.5:1:0.8, the added amount of the catalyst accounts for 0.06wt% of the total mass of the block copolymer, the thermoplastic elastomer blend and the inorganic material; the added amount of the insulating oil accounts for 0.05wt% of the total mass of the block copolymer, the thermoplastic elastomer blend and the inorganic material.

[0017] As a further preferred technical solution of the present invention, when high pressure cooking is carried out under the conditions of a test temperature of 121° C., a pressure of 0.2 MPa, and 100% RH, the elongation at break (MD / TD) of the solar back panel base film is ≥50%.

[0018] As a further preferred technical solution of the present invention, the insulating oil includes dimethyl silicone oil.

[0019] The present invention also provides a production process for a solar back panel base film as described above, the production process comprising the following steps:

[0020] S1: preparing a slurry for standby use: mixing the block copolymer and the thermoplastic elastomer blend evenly to prepare a slurry; firstly mixing the inorganic material with ethanol, and then stirring, while aerating water vapor by aeration, and then grinding, centrifuging, and dehydrating to obtain an inorganic material dispersion with a mass fraction of 30-50wt%;

[0021] S2 esterification: the slurry, catalyst and insulating oil are mixed, the heating temperature K1 is in the range of 280-350°C, the reaction pressure N1 is in the range of 210-270kPa, the reaction time T1 is in the range of 2-3.5h, and after the reaction is completed, the inorganic material dispersion is added to obtain a mixture A;

[0022] S3 polycondensation: using a heater to heat the mixture A to a temperature K2 in the range of 200-255°C, a reaction pressure N2 in the range of 35-45 kPa, and a reaction time T2 in the range of 0.5-1.5 h, to obtain a mixture B;

[0023] S4 film making: the mixed material B is heated to a temperature K3 in the range of 300-355°C, a reaction pressure N3 in the range of 100-200Pa, a reaction time T3 in the range of 4-7h, and then immersed in insulating oil under a vacuum environment for 3-8h; and then through casting, longitudinal drawing, transverse drawing, corona, heat setting, winding and cooling molding, the solar backplane base film can be obtained.

[0024] As a further preferred technical solution of the present invention, the K1 value of step S2 is 300° C., the N1 value is 250 kPa, and the reaction time T1 is 3 h.

[0025] As a further preferred technical solution of the present invention, the K2 value of step S3 is 250° C., the N2 value is 40 kPa, and the reaction time T2 is 1 h.

[0026] As a further preferred technical solution of the present invention, the K3 value of step S4 is 330° C., the N3 value is 150 Pa, and the reaction time T3 is 6 hours.

[0027] The present invention relates to a solar back panel base film and a production process thereof, which have the following beneficial effects: the solar back panel base film of the present invention contains a block copolymer and a thermoplastic elastomer blend, and is prepared by adding insulating oil, which can overcome the defect of the base film in the prior art that there is a microporous structure, and changes the internal structure of the existing base film, so that the gaps between multiple molecular groups in its internal structure are smaller, preventing the penetration of substances such as water vapor, thereby increasing the breakdown voltage of the solar back panel base film, and further improving its electrical performance, having higher reliability and safety during use; and having excellent electrical insulation and vapor barrier properties.

[0028] The present invention will be further described below in conjunction with specific implementation modes. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The actual product picture of the solar back panel base film applied for by the present invention;

[0030] Figure 2 The production process flow chart of the solar back sheet base film applied for the present invention;

[0031] Figure 3 An application scenario diagram for obtaining a solar backplane base film by applying Examples 1-3 of the present invention;

[0032] Figure 4 A technical parameter diagram of the insulating oil used in preparing the solar back panel base film of the present invention. DETAILED DESCRIPTION

[0033] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0034] The disclosure below provides many different embodiments or examples to realize different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplicity and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides various specific examples of processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0035] Example 1

[0036] For the preparation of the solar backsheet base film raw materials of the present invention, please refer to Figures 1 to 4 As shown, it is made of the following raw materials in percentage: 54 parts of block copolymer, 30 parts of thermoplastic elastomer blend, 5 parts of catalyst, 1 part of insulating oil and 10 parts of inorganic material;

[0037] The block copolymer comprises a styrene resin; the thermoplastic elastomer blend comprises a thermoplastic polyolefin; the molar ratio of the block copolymer, the thermoplastic elastomer blend and the inorganic material is 2.0:1:0.5, the amount of the catalyst added accounts for 0.06wt% of the total mass of the block copolymer, the thermoplastic elastomer blend and the inorganic material; the amount of the insulating oil added accounts for 0.01wt% of the total mass of the block copolymer, the thermoplastic elastomer blend and the inorganic material; the inorganic material is 0.6μm titanium dioxide, and the catalyst is an antimony trioxide preparation;

[0038] The solar back panel base film preparation production process comprises the following steps

[0039] S1: preparing a slurry for standby use: mixing the block copolymer and the thermoplastic elastomer blend evenly to prepare a slurry; firstly mixing the inorganic material with ethanol, and then stirring, while aerating water vapor is introduced, and then grinding, centrifuging, and dehydrating to obtain an inorganic material dispersion with a mass fraction of 30wt%;

[0040] S2 esterification: the slurry, catalyst and insulating oil are mixed, the heating temperature K1 is in the range of 290°C, the reaction pressure N1 is in the range of 210kPa, the reaction time T1 is in the range of 2.5h, and after the reaction is completed, the inorganic material dispersion is added to obtain a mixture A;

[0041] S3 polycondensation: using a heater to heat the mixture A to a temperature K2 in the range of 200°C, a reaction pressure N2 in the range of 35 kPa, and a reaction time T2 in the range of 0.5 h, to obtain a mixture B;

[0042] S4 film making: The mixed material B is heated to a temperature K3 in the range of 300°C, a reaction pressure N3 in the range of 100Pa, a reaction time T3 in the range of 4h, and then immersed in insulating oil under a vacuum environment for 3h; and then through casting, longitudinal drawing, transverse drawing, corona, heat setting, winding and cooling molding, the solar backplane base film can be obtained.

[0043] Example 2

[0044] For the preparation of the solar backsheet base film raw materials of the present invention, please refer to Figures 1 to 4 As shown, it is made of the following raw materials in percentage: 47 parts of block copolymer, 32 parts of thermoplastic elastomer blend, 6 parts of catalyst, 3 parts of insulating oil and 12 parts of inorganic material;

[0045] 25-70 parts of block copolymer, 30-50 parts of thermoplastic elastomer blend, 5-15 parts of catalyst, 1-10 parts of insulating oil and 10-20 parts of inorganic material;

[0046] The block copolymer comprises a styrene resin; the thermoplastic elastomer blend comprises a thermoplastic vulcanized rubber; the molar ratio of the block copolymer, the thermoplastic elastomer blend and the inorganic material is 2.2:1:0.6, the added amount of the catalyst accounts for 0.05wt% of the total mass of the block copolymer, the thermoplastic elastomer blend and the inorganic material; the added amount of the insulating oil accounts for 0.01wt% of the total mass of the block copolymer, the thermoplastic elastomer blend and the inorganic material; the inorganic material is 0.65μm titanium dioxide, and the catalyst is an antimony trioxide preparation;

[0047] The solar back panel base film preparation production process comprises the following steps

[0048] S1: preparing a slurry for standby use: mixing the block copolymer and the thermoplastic elastomer blend evenly to prepare a slurry; firstly mixing the inorganic material with ethanol, and then stirring, while aerating water vapor by aeration, and then grinding, centrifuging, and dehydrating to obtain an inorganic material dispersion with a mass fraction of 30-50wt%;

[0049] S2 esterification: the slurry, catalyst and insulating oil are mixed, the heating temperature K1 is in the range of 280°C, the reaction pressure N1 is in the range of 210kPa, the reaction time T1 is in the range of 2h, and after the reaction is completed, the inorganic material dispersion is added to obtain a mixture A;

[0050] S3 polycondensation: using a heater to heat the mixture A to a temperature K2 in the range of 200°C, a reaction pressure N2 in the range of 35 kPa, and a reaction time T2 in the range of 1 h, to obtain a mixture B;

[0051] S4 film making: the mixed material B is heated to a temperature K3 in the range of 300°C, a reaction pressure N3 in the range of 120Pa, a reaction time T3 in the range of 4-7h, and then immersed in insulating oil under a vacuum environment for 3h; and then through casting, longitudinal drawing, transverse drawing, corona, heat setting, winding and cooling forming, the solar backplane base film can be obtained.

[0052] Example 3

[0053] For the preparation of the solar backsheet base film raw materials of the present invention, please refer to Figures 1 to 4 As shown, it is made of the following raw materials in percentage: 43 parts of block copolymer, 33 parts of thermoplastic elastomer blend, 7 parts of catalyst, 2 parts of insulating oil and 15 parts of inorganic material;

[0054] The block copolymer comprises a styrene resin; the thermoplastic elastomer blend comprises a thermoplastic polyolefin; the molar ratio of the block copolymer, the thermoplastic elastomer blend and the inorganic material is 2.1:1:0.7, the amount of the catalyst added accounts for 0.06wt% of the total mass of the block copolymer, the thermoplastic elastomer blend and the inorganic material; the amount of the insulating oil added accounts for 0.03wt% of the total mass of the block copolymer, the thermoplastic elastomer blend and the inorganic material; the inorganic material is 0.6μm titanium dioxide, and the catalyst is an antimony trioxide preparation;

[0055] The solar back panel base film preparation production process comprises the following steps

[0056] S1: preparing a slurry for standby use: mixing the block copolymer and the thermoplastic elastomer blend evenly to prepare a slurry; firstly mixing the inorganic material with ethanol, and then stirring, while aerating water vapor by aeration, and then grinding, centrifuging, and dehydrating to obtain an inorganic material dispersion with a mass fraction of 30-50wt%;

[0057] S2 esterification: the slurry, catalyst and insulating oil are mixed, the heating temperature K1 is in the range of 285°C, the reaction pressure N1 is in the range of 220kPa, the reaction time T1 is in the range of 2.2h, and after the reaction is completed, the inorganic material dispersion is added to obtain a mixture A;

[0058] S3 polycondensation: using a heater to heat the mixture A to a temperature K2 in the range of 210°C, a reaction pressure N2 in the range of 38 kPa, and a reaction time T2 in the range of 0.8 h, to obtain a mixture B;

[0059] S4 film making: The mixed material B is heated to a temperature K3 in the range of 300°C, a reaction pressure N3 in the range of 110Pa, a reaction time T3 in the range of 4h, and then immersed in insulating oil under a vacuum environment for 4h; and then through casting, longitudinal drawing, transverse drawing, corona, heat setting, winding and cooling forming, the solar backplane base film can be obtained.

[0060] Example 4

[0061] For the preparation of the solar backsheet base film raw materials of the present invention, please refer to Figures 1 to 4 As shown, it is made of the following raw materials in percentage: 40 parts of block copolymer, 35 parts of thermoplastic elastomer blend, 5 parts of catalyst, 5 parts of insulating oil and 15 parts of inorganic material;

[0062] wherein the block copolymer comprises a copolymer; and the thermoplastic elastomer blend comprises a thermoplastic vulcanizate;

[0063] The molar ratio of the block copolymer, the thermoplastic elastomer blend and the inorganic material is 3.0:1:0.7, the added amount of the catalyst accounts for 0.08wt% of the total mass of the block copolymer, the thermoplastic elastomer blend and the inorganic material; the added amount of the insulating oil accounts for 0.05wt% of the total mass of the block copolymer, the thermoplastic elastomer blend and the inorganic material; the inorganic material is 0.8μm titanium dioxide, and the catalyst is an antimony trioxide preparation;

[0064] The solar back panel base film preparation production process comprises the following steps

[0065] S1: preparing a slurry for standby use: mixing the block copolymer and the thermoplastic elastomer blend evenly to prepare a slurry; firstly mixing the inorganic material with ethanol, and then stirring, while aerating water vapor by aeration, and then grinding, centrifuging, and dehydrating to obtain an inorganic material dispersion with a mass fraction of 30-50wt%;

[0066] S2 esterification: the slurry, catalyst and insulating oil are mixed, the heating temperature K1 is in the range of 290°C, the reaction pressure N1 is in the range of 220kPa, the reaction time T1 is in the range of 2.5h, and after the reaction is completed, the inorganic material dispersion is added to obtain a mixture A;

[0067] S3 polycondensation: using a heater to heat the mixture A to a temperature K2 in the range of 230°C, a reaction pressure N2 in the range of 40 kPa, and a reaction time T2 in the range of 1.2 h, to obtain a mixture B;

[0068] S4 film making: the mixed material B is heated to a temperature K3 in the range of 320°C, a reaction pressure N3 in the range of 120Pa, a reaction time T3 in the range of 5h, and then immersed in insulating oil under a vacuum environment for 5h; and then through casting, longitudinal drawing, transverse drawing, corona, heat setting, winding and cooling forming, the solar backplane base film can be obtained.

[0069] Example 5

[0070] For the preparation of the solar backsheet base film raw materials of the present invention, please refer to Figures 1 to 4 As shown, it is made of the following raw materials in percentage: 37 parts of block copolymer, 40 parts of thermoplastic elastomer blend, 5 parts of catalyst, 8 parts of insulating oil and 10 parts of inorganic material;

[0071] The block copolymer comprises polyurethane; the thermoplastic elastomer blend comprises thermoplastic polyolefin; the molar ratio of the block copolymer, the thermoplastic elastomer blend and the inorganic material is 2.5:1:0.8, the added amount of the catalyst accounts for 0.06wt% of the total mass of the block copolymer, the thermoplastic elastomer blend and the inorganic material; the added amount of the insulating oil accounts for 0.05wt% of the total mass of the block copolymer, the thermoplastic elastomer blend and the inorganic material; the inorganic material is 0.7μm titanium dioxide, and the catalyst is an antimony trioxide preparation;

[0072] The solar back panel base film preparation production process comprises the following steps

[0073] S1: preparing a slurry for standby use: mixing the block copolymer and the thermoplastic elastomer blend evenly to prepare a slurry; firstly mixing the inorganic material with ethanol, and then stirring, while aerating water vapor by aeration, and then grinding, centrifuging, and dehydrating to obtain an inorganic material dispersion with a mass fraction of 30-50wt%;

[0074] S2 esterification: the slurry, catalyst and insulating oil are mixed, the heating temperature K1 is in the range of 300°C, the reaction pressure N1 is in the range of 250kPa, the reaction time T1 is in the range of 3h, and after the reaction is completed, the inorganic material dispersion is added to obtain a mixture A;

[0075] S3 polycondensation: using a heater to heat the mixture A to a temperature K2 in the range of 250°C, a reaction pressure N2 in the range of 40 kPa, and a reaction time T2 in the range of 1 h, to obtain a mixture B;

[0076] S4 film making: the mixed material B is heated to a temperature K3 in the range of 330°C, a reaction pressure N3 in the range of 150Pa, a reaction time T3 in the range of 6h, and then immersed in insulating oil under a vacuum environment for 8h; and then through casting, longitudinal drawing, transverse drawing, corona, heat setting, winding and cooling forming, the solar backplane base film can be obtained.

[0077] Example 6

[0078] For the preparation of the solar backsheet base film raw materials of the present invention, please refer to Figures 1 to 4 As shown, it is made of the following raw materials in percentage: 36 parts of block copolymer, 36 parts of thermoplastic elastomer blend, 6 parts of catalyst, 8 parts of insulating oil and 14 parts of inorganic material;

[0079] The block copolymer comprises polyamide; the thermoplastic elastomer blend comprises thermoplastic polyolefin; the molar ratio of the block copolymer, the thermoplastic elastomer blend and the inorganic material is 2.3:1:0.5, the added amount of the catalyst accounts for 0.06wt% of the total mass of the block copolymer, the thermoplastic elastomer blend and the inorganic material; the added amount of the insulating oil accounts for 0.07wt% of the total mass of the block copolymer, the thermoplastic elastomer blend and the inorganic material; the inorganic material is 0.7μm titanium dioxide, and the catalyst is an antimony trioxide preparation;

[0080] The solar back panel base film preparation production process comprises the following steps

[0081] S1: preparing a slurry for standby use: mixing the block copolymer and the thermoplastic elastomer blend evenly to prepare a slurry; firstly mixing the inorganic material with ethanol, and then stirring, while aerating water vapor is introduced, and then grinding, centrifuging, and dehydrating to obtain an inorganic material dispersion with a mass fraction of 47wt%;

[0082] S2 esterification: the slurry, catalyst and insulating oil are mixed, the heating temperature K1 is in the range of 295°C, the reaction pressure N1 is in the range of 220kPa, the reaction time T1 is in the range of 2.7h, and after the reaction is completed, the inorganic material dispersion is added to obtain a mixture A;

[0083] S3 polycondensation: using a heater to heat the mixture A to a temperature K2 in the range of 230°C, a reaction pressure N2 in the range of 40 kPa, and a reaction time T2 in the range of 0.8 h, to obtain a mixture B;

[0084] S4 film making: the mixed material B is heated to a temperature K3 in the range of 345°C, a reaction pressure N3 in the range of 180Pa, a reaction time T3 in the range of 6h, and then immersed in insulating oil under a vacuum environment for 6h; and then through casting, longitudinal drawing, transverse drawing, corona, heat setting, winding and cooling forming, the solar backplane base film can be obtained.

[0085] Example 7

[0086] For the preparation of the solar backsheet base film raw materials of the present invention, please refer to Figures 1 to 4 As shown, it is made of the following raw materials in percentage: 27 parts of block copolymer, 45 parts of thermoplastic elastomer blend, 5 parts of catalyst, 5 parts of insulating oil and 18 parts of inorganic material;

[0087] The block copolymer comprises polyamide; the thermoplastic elastomer blend comprises thermoplastic polyolefin; the molar ratio of the block copolymer, the thermoplastic elastomer blend and the inorganic material is 3.0:1:1, the added amount of the catalyst accounts for 0.08wt% of the total mass of the block copolymer, the thermoplastic elastomer blend and the inorganic material; the added amount of the insulating oil accounts for 0.1wt% of the total mass of the block copolymer, the thermoplastic elastomer blend and the inorganic material; the inorganic material is 0.8μm titanium dioxide, and the catalyst is an antimony trioxide preparation;

[0088] The solar back panel base film preparation production process comprises the following steps

[0089] S1: preparing a slurry for standby use: mixing the block copolymer and the thermoplastic elastomer blend evenly to prepare a slurry; firstly mixing the inorganic material with ethanol, and then stirring, while aerating water vapor is introduced, and then grinding, centrifuging, and dehydrating to obtain an inorganic material dispersion with a mass fraction of 50wt%;

[0090] S2 esterification: the slurry, catalyst and insulating oil are mixed, the heating temperature K1 is in the range of 350°C, the reaction pressure N1 is in the range of 270 kPa, the reaction time T1 is in the range of 3.5 h, and after the reaction is completed, the inorganic material dispersion is added to obtain a mixture A;

[0091] S3 polycondensation: using a heater to heat the mixture A to a temperature K2 in the range of 255°C, a reaction pressure N2 in the range of 45 kPa, and a reaction time T2 in the range of 1.5 h, to obtain a mixture B;

[0092] S4 film making: the mixed material B is heated to a temperature K3 in the range of 355°C, a reaction pressure N3 in the range of 200Pa, a reaction time T3 in the range of 7h, and then immersed in insulating oil under a vacuum environment for 7h; and then through casting, longitudinal drawing, transverse drawing, corona, heat setting, winding and cooling forming, the solar backplane base film can be obtained.

[0093] It should be noted that the difference between the above examples 1-7 lies in the different ratios of raw materials and the production process conditions of the preparation, wherein the insulating oil is dimethyl silicone oil produced by Shenzhen Jipeng Silicon Materials Co., Ltd., which is a colorless transparent liquid with a viscosity of 50cs-20 millioncs and a CAS number of 63148-62-9; the antimony trioxide preparation is a product produced by Jinan Jinyingtai Chemical Co., Ltd., which is a white powder with an average particle size of 0.3-0.9um; the solar backplane base film obtained in the above examples 1-7 is a translucent milky white film, and the actual product is shown in FIG. Figure 1 As shown; it can meet the performance requirements of PCT48h and is widely used in solar back panels. The application scenario diagram is shown in Figure 3 As shown; the performance parameters of the aforementioned dimethyl silicone oil are shown in Figure 4 shown.

[0094] The thickness of the solar back panel base film prepared in the above embodiments 1-7 ranges from 188 to 350 um, the width ranges from 500 to 1600 mm, the roll diameter ranges from 320 to 720 mm, and the roll core diameter ranges from 3° to 6°.

[0095] The solar back panel base film prepared in the above-mentioned Examples 1-7 has an elongation at break (MD / TD) ≥ 50% when subjected to high-pressure steaming at a test temperature of 121°C, a pressure of 0.2 MPa and 100% RH; wherein MD in MD / TD represents the transverse direction and TD represents the longitudinal direction.

[0096] Reference example

[0097] The difference from Example 5 is that no block copolymer, thermoplastic elastomer and insulating oil are added in the preparation process.

[0098] Comparative Example 1

[0099] The difference from Example 5 is that no insulating oil is added in the preparation process, and other preparation conditions remain the same as those of this example.

[0100] Comparative Example 2

[0101] The difference from Example 5 is that no block copolymer and insulating oil are added in the preparation process, and other preparation conditions remain the same as those of this example.

[0102] Comparative Example 3

[0103] The difference from Example 5 is that no thermoplastic elastomer and insulating oil are added in the preparation process, and other preparation conditions remain the same as those of this example.

[0104] Performance test and results

[0105] The solar backplane base films obtained in Examples 1-7, Reference Examples and Comparative Examples 1-3 were tested for their respective properties of elongation at break, water vapor permeability and breakdown voltage under the condition of the same thickness to determine whether they met the standards recorded in ASTMD882, JESD22-A102-C and GB / T 13542.2-2009 "Insulating Film for Crystalline Silicon Solar Cell Modules". The performance test method for elongation at break was high pressure cooking, and the performance test conditions were a test temperature of 121°C, a pressure of 0.2 MPa and 100% RH. The test results of the aforementioned test items are shown in Table 1 below.

[0106]

[0107]

[0108] From the above table, it can be seen that: compared with comparative examples 1-3 and the reference example, in the breakdown voltage performance test data of the base film with the same thickness of 350um, the breakdown voltage values ​​of the solar backplane base film obtained in Examples 1-7 are all greater than 17.5KV, among which the value of Example 5 is 20.3, which is the largest, indicating that the breakdown voltage value of the solar backplane base film obtained in Example 5 is the best. By adding insulating oil to prepare the solar backplane base film, the breakdown voltage of the solar backplane base film can be significantly improved. This may be because the addition of insulating oil on the basis of containing block copolymers and thermoplastic elastomer blends can overcome the defects of the base film in the prior art with a microporous structure, and change the internal structure of the existing base film, making its internal The gaps between multiple molecular groups of the structure are smaller; at the same time, from the water vapor permeability (%) performance test, it can be seen that: compared with comparative examples 1-3, the water vapor permeability of Example 5 is only 1.7%, indicating that the solar backplane base film has the characteristics of preventing the penetration of substances such as water vapor, and has excellent electrical insulation and vapor barrier properties; and from the performance test data of the elongation at break, the elongation at break of Examples 1-7 are all greater than 150%, among which Example 5 is the best; in summary, the present invention application can greatly improve the breakdown voltage of the solar backplane base film, and can further improve its electrical performance, and has higher reliability and safety during use; and has excellent electrical insulation and vapor barrier properties.

[0109] In the description of this specification, the description with reference to the terms "one embodiment", "certain embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" 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 may be combined in any one or more embodiments or examples in a suitable manner.

[0110] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the creative concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A solar back sheet base film, characterized in that: It is made of the following raw materials in percentage: 25-70 parts of block copolymer, 30-50 parts of thermoplastic elastomer blend, 5-15 parts of catalyst, 1-10 parts of insulating oil and 10-20 parts of inorganic material; wherein the block copolymer comprises at least one of a styrenic resin, a copolyester, a polyurethane or a polyamide; and the thermoplastic elastomer blend comprises at least one of a thermoplastic polyolefin or a thermoplastic vulcanizate; The molar ratio of the block copolymer, the thermoplastic elastomer blend and the inorganic material is (2.0-3.5):1:(0.5-1.5), the added amount of the catalyst accounts for 0.05-0.08wt% of the total mass of the block copolymer, the thermoplastic elastomer blend and the inorganic material; the added amount of the insulating oil accounts for 0.01-0.1wt% of the total mass of the block copolymer, the thermoplastic elastomer blend and the inorganic material; the inorganic material is 0.6-0.8μm titanium dioxide, and the catalyst is an antimony trioxide preparation; The solar back panel base film preparation process includes: S1: preparing a slurry for standby use: mixing the block copolymer and the thermoplastic elastomer blend evenly to prepare a slurry; firstly mixing the inorganic material with ethanol, and then stirring, while aerating water vapor by aeration, and then grinding, centrifuging, and dehydrating to obtain an inorganic material dispersion with a mass fraction of 30-50wt%; S2 esterification: the slurry, catalyst and insulating oil are mixed, the heating temperature K1 is in the range of 280-350°C, the reaction pressure N1 is in the range of 210-270kPa, the reaction time T1 is in the range of 2-3.5h, and after the reaction is completed, the inorganic material dispersion is added to obtain a mixture A; S3 polycondensation: using a heater to heat the mixture A to a temperature K2 in the range of 200-255°C, a reaction pressure N2 in the range of 35-45 kPa, and a reaction time T2 in the range of 0.5-1.5 h, to obtain a mixture B; S4 film making: the mixed material B is heated to a temperature K3 in the range of 300-355°C, a reaction pressure N3 in the range of 100-200Pa, a reaction time T3 in the range of 4-7h, and then immersed in insulating oil under a vacuum environment for 3-8h; and then through casting, longitudinal drawing, transverse drawing, corona, heat setting, winding and cooling molding, the solar backplane base film can be obtained.

2. A solar back sheet base film as claimed in claim 1, characterized in that: The block copolymer comprises 37 parts, the thermoplastic elastomer blend comprises 40 parts, the catalyst comprises 5 parts, the insulating oil comprises 8 parts and the inorganic material comprises 10 parts.

3. A solar back sheet base film as claimed in claim 1, characterized in that: The thickness of the solar back panel base film ranges from 188 to 350 um, the width ranges from 500 to 1600 mm, the roll diameter ranges from 320 to 720 mm, and the roll core diameter ranges from 3° to 6°.

4. A solar back sheet base film as claimed in claim 1, 2 or 3, characterized in that: The molar ratio of the block copolymer, the thermoplastic elastomer blend and the inorganic material is 2.5:1:0.8, the added amount of the catalyst accounts for 0.06wt% of the total mass of the block copolymer, the thermoplastic elastomer blend and the inorganic material; the added amount of the insulating oil accounts for 0.05wt% of the total mass of the block copolymer, the thermoplastic elastomer blend and the inorganic material.

5. A solar back sheet base film as claimed in claim 1, 2 or 3, characterized in that: When high pressure steam cooking is performed under the conditions of a test temperature of 121° C., a pressure of 0.2 MPa, and 100% RH, the elongation at break (MD / TD) of the solar back panel base film is ≥50%.

6. A solar back sheet base film as claimed in claim 1, 2 or 3, characterized in that: The insulating oil includes dimethyl silicone oil.

7. A production process for a solar backsheet base film according to any one of claims 1 to 6, characterized in that: The production process includes the following steps S1: preparing a slurry for standby use: mixing the block copolymer and the thermoplastic elastomer blend evenly to prepare a slurry; firstly mixing the inorganic material with ethanol, and then stirring, while aerating water vapor by aeration, and then grinding, centrifuging, and dehydrating to obtain an inorganic material dispersion with a mass fraction of 30-50wt%; S2 esterification: the slurry, catalyst and insulating oil are mixed, the heating temperature K1 is in the range of 280-350°C, the reaction pressure N1 is in the range of 210-270kPa, the reaction time T1 is in the range of 2-3.5h, and after the reaction is completed, the inorganic material dispersion is added to obtain a mixture A; S3 polycondensation: using a heater to heat the mixture A to a temperature K2 in the range of 200-255°C, a reaction pressure N2 in the range of 35-45 kPa, and a reaction time T2 in the range of 0.5-1.5 h, to obtain a mixture B; S4 film making: the mixed material B is heated to a temperature K3 in the range of 300-355°C, a reaction pressure N3 in the range of 100-200Pa, a reaction time T3 in the range of 4-7h, and then immersed in insulating oil under a vacuum environment for 3-8h; and then through casting, longitudinal drawing, transverse drawing, corona, heat setting, winding and cooling molding, the solar backplane base film can be obtained.

8. The production process according to claim 7, characterized in that: The K1 value of step S2 is 300° C., the N1 value is 250 kPa, and the reaction time T1 is 3 h.

9. The production process according to claim 7, characterized in that: The K2 value of step S3 is 250° C., the N2 value is 40 kPa, and the reaction time T2 is 1 h.

10. The production process according to claim 7, characterized in that: The K3 value of step S4 is 330° C., the N3 value is 150 Pa, and the reaction time T3 is 6 h.

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