A polysilicon packaging film and its application

Abstract

The present invention relates to the technical field of polysilicon packaging films, and discloses a polysilicon packaging film and application thereof. The polysilicon packaging film comprises the following raw materials: ABS resin, terpene resin, hindered amine-modified polyvinyl butyral, functional polyetheretherketone, antioxidant, stabilizer, lubricant, and initiator. The present invention prepares hindered amine-modified polyvinyl butyral and functional polyetheretherketone to participate in the preparation process of polysilicon packaging film, so that the prepared polysilicon packaging film has excellent high temperature resistance, tensile strength, impact resistance and UV resistance, can meet the use requirements in various environments, and has high transparency. When in use, the pattern and text on the surface of the polysilicon cell can be clearly identified, effectively enhancing the recognition of the product and improving the use efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of polysilicon packaging films, and in particular to a polysilicon packaging film and applications thereof. Background Art

[0002] Polysilicon is a non-metallic material made from industrial silicon. It has semiconductor properties and is the basic raw material for widely used semiconductor products such as contemporary artificial intelligence, automatic control, information processing, and photoelectric conversion. In the production of solar cells, polysilicon cells play an extremely outstanding role in energy conversion.

[0003] Although polysilicon materials are widely used, they are very easy to be contaminated. During the production, transportation, storage and other processes, they must be strictly packaged. Most general polysilicon packaging films use PE materials. Although they can meet the packaging needs to a certain extent, they have high impurity content, poor mechanical properties, general high temperature resistance, low transparency, and no UV resistance. Therefore, in actual use, the edges and corners of polysilicon cells are easy to damage the packaging film. When polysilicon cells work in a high temperature environment, the packaging material is easy to soften, affecting the safety of use. In outdoor environments, ultraviolet erosion will cause the brittleness and aging of the packaging material, affecting the protection of the polysilicon cells. The lack of transparency of the packaging material will make it difficult for users to clearly see the patterns and text on the surface of the cell, increasing the difficulty of product identification.

[0004] The patent with announcement number CN112172290B discloses a film and a production method and a packaging bag containing the film and its application. The film is composed of three layers: an inner surface layer, an intermediate layer and an outer surface layer. It has the characteristics of high tensile strength, strong puncture resistance and low surface metal precipitation. It can be used for the packaging of polysilicon and products with high cleanliness requirements and high hardness. Although the patent has improved the prepared packaging material, the preparation process is relatively complicated, which limits the possibility of large-scale production of the product. Summary of the invention

[0005] The purpose of the present invention is to provide a polysilicon packaging film and application, which solves the problems of low transparency, poor mechanical strength, weak UV resistance and high temperature resistance of ordinary polysilicon packaging films.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A polysilicon packaging film comprises the following raw materials in parts by weight: 45-60 parts of ABS resin, 12-15 parts of terpene resin, 10-12 parts of hindered amine-modified polyvinyl butyral, 8-10 parts of functional polyetheretherketone, 2-3 parts of antioxidant, 3-5 parts of stabilizer, 2-5 parts of lubricant and 3-6 parts of initiator.

[0008] Furthermore, the antioxidant is any one of antioxidant 1010, antioxidant 168, and antioxidant 5057; the stabilizer is any one of triphenyl phosphite, tridecyl phosphite, and trinonyl phosphite; the lubricant is any one of sodium stearate and magnesium stearate; and the initiator is any one of azobisisobutyronitrile and azobisisoheptylnitrile.

[0009] Furthermore, the preparation method of the hindered amine-modified polyvinyl butyral comprises the following steps:

[0010] S1: placing polyvinyl butyral in toluene, adding itaconic anhydride and p-toluenesulfonic acid, heating to react, and removing the solvent after reduced pressure distillation to obtain modified polyvinyl butyral;

[0011] S2: Place the modified polyvinyl butyral and 4-amino-2,2,6,6-tetramethylpiperidine in xylene, add a composite catalyst, heat to 65-75°C for reaction for 5-6 hours, collect the product after reduced pressure distillation, and obtain hindered amine modified polyvinyl butyral.

[0012] In this scheme, under the action of p-toluenesulfonic acid, the hydroxyl group in the structure of polyvinyl butyral reacts with the anhydride group in the structure of itaconic anhydride to obtain modified polyvinyl butyral, and then under the action of a composite catalyst, the carboxyl group in the structure of modified polyvinyl butyral reacts with the amino group in the structure of 4-amino-2,2,6,6-tetramethylpiperidine to obtain hindered amine-modified polyvinyl butyral. The hindered amine-modified polyvinyl butyral uses polyvinyl butyral as a polymer skeleton, has excellent flexibility, can effectively improve the impact resistance of the polycrystalline silicon packaging film, making it less likely to crack, and can effectively improve the transparency of the polycrystalline silicon packaging film, enhancing the recognition of the polycrystalline silicon cell when in use. At the same time, the double bonds in its structure can participate in the polymerization reaction of the polycrystalline silicon packaging film matrix material, effectively enhancing the compatibility between the hindered amine-modified polyvinyl butyral and the matrix, and introducing 4-amino-2,2,6,6-tetramethylpiperidine into the polymer skeleton in a chemically bonded manner, so that the small molecule hindered amine is not easy to precipitate, and the polycrystalline silicon packaging film has an anti-ultraviolet aging effect when used for a long time, thereby extending the service life of the polycrystalline silicon packaging film.

[0013] Furthermore, in step S1, the temperature of the temperature-raising reaction is 80-95° C. and the time is 3-5 hours.

[0014] Furthermore, in step S2, the composite catalyst is 4-dimethylaminopyridine and N,N-dicyclohexylcarbodiimide in a mass ratio of 0.1-0.5:0.3-1.5.

[0015] Furthermore, the preparation method of the functional polyetheretherketone comprises the following steps:

[0016] SS1: Place polyetheretherketone in chloroform, stir and mix thoroughly, introduce nitrogen, add bromoacetyl chloride and aluminum chloride, heat to reflux for reaction, collect the product after reduced pressure distillation, and obtain bromoethylated polyetheretherketone;

[0017] SS2: Place bromoethylated polyetheretherketone in N,N-dimethylformamide, mix and stir thoroughly, then add 1,1,3,3-tetramethyl-1,3-divinyldisilazane and accelerator, heat to 65-70°C and react for 2-3h, remove the solvent by rotary evaporation, collect the product, and obtain functional polyetheretherketone.

[0018] In this scheme, polyetheretherketone and bromoacetyl chloride undergo Friedel-Crafts alkylation reaction under the catalytic action of aluminum chloride to obtain bromoethylated polyetheretherketone, and then under the action of a promoter, the active bromine in the bromoethylated polyetheretherketone structure undergoes a substitution reaction with the imine group in the 1,1,3,3-tetramethyl-1,3-divinyldisilazane structure to obtain functional polyetheretherketone. This functional polyetheretherketone has excellent high temperature resistance. Bromoacetyl chloride is used as a bridging agent to fix 1,1,3,3-tetramethyl-1,3-divinyldisilazane in a chemically bonded manner in the polymer skeleton. Multiple alkenyl groups are introduced into the modified polyetheretherketone structure, which can be used as a crosslinking agent in the preparation process of polysilicon packaging film to form a three-dimensional network structure, further enhancing the impact resistance of the polysilicon packaging film. At the same time, the silazane introduced into its structure has excellent high temperature resistance, which can further improve the high temperature resistance of the polysilicon packaging film, so that it can meet the use requirements in high temperature environments and has a long service life.

[0019] Furthermore, in step SS1, the heating reflux reaction time is 10-12h.

[0020] Furthermore, in step SS2, the accelerator is sodium bicarbonate.

[0021] Furthermore, the method for preparing the polycrystalline silicon packaging film comprises the following preparation steps:

[0022] Step 1, placing ABS resin, terpene resin, hindered amine-modified polyvinyl butyral, functional polyetheretherketone, antioxidant, stabilizer, lubricant, and initiator in a high-speed mixer, and mixing at 130-140° C. for 1-1.5 hours to obtain a mixture;

[0023] Step 2: placing the mixed material in a film blowing machine, blowing it into a film, and obtaining a polysilicon packaging film after cutting and packaging.

[0024] An application of a polycrystalline silicon packaging film, wherein a polycrystalline silicon cell is placed in the polycrystalline silicon packaging film, and the film is vacuumized and then sealed and packaged.

[0025] The polycrystalline silicon cell is cleaned to remove dust, oil and other impurities on the surface. After ensuring that the surface of the polycrystalline silicon cell is clean, it is placed in the center of the polycrystalline silicon packaging film, vacuumed to remove internal air and moisture, and sealed with an ultrasonic sealing machine to complete the packaging of the polycrystalline silicon cell.

[0026] Beneficial effects of the present invention:

[0027] The present invention prepares hindered amine-modified polyvinyl butyral and functional polyetheretherketone in the preparation process of polycrystalline silicon packaging film, so that the prepared polycrystalline silicon packaging film has excellent high temperature resistance, tensile strength, impact resistance and UV resistance, can meet the use requirements in various environments, and has high transparency. When in use, the pattern and text on the surface of the polycrystalline silicon cell can be clearly identified, which can enhance the recognition of the product and improve the use efficiency.

[0028] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0030] Figure 1 The present invention is a flow chart of the preparation of polysilicon packaging film according to an embodiment of the present invention. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] The preparation methods of the hindered amine-modified polyvinyl butyral and functional polyetheretherketone in the following examples and comparative examples of the present invention are as follows:

[0033] 1. Preparation of Hindered Amine Modified Polyvinyl Butyral

[0034] S1: 2.6 g of polyvinyl butyral was placed in 60 ml of toluene, 2.3 g of itaconic anhydride and 0.03 g of p-toluenesulfonic acid were added, the temperature was raised to 80°C for reaction for 3 h, and the solvent was removed by reduced pressure distillation to obtain modified polyvinyl butyral;

[0035] S2: 3 g of modified polyvinyl butyral and 2.5 g of 4-amino-2,2,6,6-tetramethylpiperidine were placed in 80 ml of xylene, 0.1 g of 4-dimethylaminopyridine and 0.3 g of N,N-dicyclohexylcarbodiimide were added, the temperature was raised to 65°C for reaction for 5 h, and the product was collected after reduced pressure distillation to obtain hindered amine modified polyvinyl butyral.

[0036] The nitrogen element in modified polyvinyl butyral and hindered amine modified polyvinyl butyral was analyzed using a CHN-8000B element analyzer. The analysis showed that the modified polyvinyl butyral did not contain nitrogen, and the nitrogen content in hindered amine modified polyvinyl butyral was 5.7%, which was caused by the reaction between the amino group in the structure of 4-amino-2,2,6,6-tetramethylpiperidine and the carboxyl group in the structure of modified polyvinyl butyral.

[0037] 2. Preparation of functional polyetheretherketone

[0038] SS1: 2.8 g of polyetheretherketone was placed in 80 ml of chloroform, the mixture was fully stirred and mixed, nitrogen was introduced, 1.6 g of bromoacetyl chloride and 0.4 g of aluminum chloride were added, the mixture was heated under reflux for 10 h, and the product was collected after reduced pressure distillation to obtain bromoethylated polyetheretherketone;

[0039] The bromine content in bromoethylated polyetheretherketone was tested by titration. The specific detection method is as follows: take 1g bromoethylated polyetheretherketone as a sample and place it in a conical flask, take 10ml deionized water for dilution, add 10ml sodium hypochlorite, shake well, add 4g boric acid, heat in a boiling water bath for 10min, cool to 60℃, add 10ml sodium formate solution with a mass fraction of 20%, rinse the bottle wall with water, continue heating for 5min, cool to room temperature, add 2g potassium iodide and 20ml hydrochloric acid with a concentration of 6mol / L, shake well, use 0.1mol / L sodium thiosulfate standard solution to titrate until the solution changes color, add 1ml starch indicator, continue titrating until the solution changes color, and do a blank experiment at the same time. The bromine content in the sample is calculated according to the following formula:

[0040]

[0041] Wherein, C is the concentration of sodium thiosulfate solution, mol / L; V is the volume of sodium thiosulfate solution consumed by the sample, ml; V0 is the volume of sodium thiosulfate consumed by the blank, ml; M is the mass of the sample, g; 79.904 is the molar mass of bromide ion, g / mol; 6 is the conversion factor; after calculation, the bromine content in the structure of bromoethylated polyetheretherketone is 8.1%.

[0042] SS2: Place 3.2 g of bromoethylated polyetheretherketone in 100 ml of N,N-dimethylformamide, mix and stir thoroughly, then add 2.6 g of 1,1,3,3-tetramethyl-1,3-divinyldisilazane and 0.5 g of sodium bicarbonate, heat to 65 °C and react for 2 h, remove the solvent by rotary evaporation, collect the product, and obtain functional polyetheretherketone.

[0043] The bromine content in the functional polyetheretherketone was tested by titration. The specific test method was the same as step SS1. After calculation, the bromine content in the functional polyetheretherketone was 1.3%. The lost part was caused by the substitution reaction between the active bromine in the bromoethylated polyetheretherketone structure and the imine group in 1,1,3,3-tetramethyl-1,3-divinyldisilazane.

[0044] Example 1

[0045] Preparation of polysilicon packaging film

[0046] Step 1, 45 parts of ABS resin, 12 parts of terpene resin, 10 parts of hindered amine-modified polyvinyl butyral, 8 parts of functional polyetheretherketone, 2 parts of antioxidant 1010, 3 parts of triphenyl phosphite, 2 parts of sodium stearate, and 3 parts of azobisisobutyronitrile are placed in a high-speed mixer, and mixed at 130° C. for 1 hour to obtain a mixture;

[0047] Step 2: placing the mixed material in a film blowing machine, blowing it into a film, and obtaining a polysilicon packaging film after cutting and packaging.

[0048] Example 2

[0049] Preparation of polysilicon packaging film

[0050] Step 1: Place 55 parts of ABS resin, 13 parts of terpene resin, 11 parts of hindered amine-modified polyvinyl butyral, 9 parts of functional polyetheretherketone, 2.5 parts of antioxidant 168, 4 parts of tridecyl phosphite, 2 parts of magnesium stearate, and 3 parts of azobisisoheptonitrile in a high-speed mixer, and mix at 135° C. for 1.2 hours to obtain a mixture;

[0051] Step 2: placing the mixed material in a film blowing machine, blowing it into a film, and obtaining a polysilicon packaging film after cutting and packaging.

[0052] Example 3

[0053] Preparation of polysilicon packaging film

[0054] Step 1: put 60 parts of ABS resin, 15 parts of terpene resin, 12 parts of hindered amine-modified polyvinyl butyral, 10 parts of functional polyetheretherketone, 3 parts of antioxidant 5057, 5 parts of trinonyl phosphite, 5 parts of sodium stearate, and 6 parts of azobisisobutyronitrile in a high-speed mixer, and mix at 140° C. for 1.5 hours to obtain a mixture;

[0055] Step 2: placing the mixed material in a film blowing machine, blowing it into a film, and obtaining a polysilicon packaging film after cutting and packaging.

[0056] Comparative Example 1

[0057] Preparation of polysilicon packaging film

[0058] Step 1: Place 55 parts of ABS resin, 13 parts of terpene resin, 11 parts of hindered amine-modified polyvinyl butyral, 2.5 parts of antioxidant 168, 4 parts of tridecyl phosphite, 2 parts of magnesium stearate, and 3 parts of azobisisoheptonitrile in a high-speed mixer, and mix at 135° C. for 1.2 hours to obtain a mixture;

[0059] Step 2: placing the mixed material in a film blowing machine, blowing it into a film, and obtaining a polysilicon packaging film after cutting and packaging.

[0060] Comparative Example 2

[0061] Preparation of polysilicon packaging film

[0062] Step 1: Place 55 parts of ABS resin, 13 parts of terpene resin, 9 parts of functional polyetheretherketone, 2.5 parts of antioxidant 168, 4 parts of tridecyl phosphite, 2 parts of magnesium stearate, and 3 parts of azobisisoheptonitrile in a high-speed mixer, and mix at 135° C. for 1.2 hours to obtain a mixture;

[0063] Step 2: placing the mixed material in a film blowing machine, blowing it into a film, and obtaining a polysilicon packaging film after cutting and packaging.

[0064] Comparative Example 3

[0065] Preparation of polysilicon packaging film

[0066] Step 1, 55 parts of ABS resin, 13 parts of terpene resin, 11 parts of polyvinyl butyral, 9 parts of functional polyetheretherketone, 2.5 parts of antioxidant 168, 4 parts of tridecyl phosphite, 2 parts of magnesium stearate, and 3 parts of azobisisoheptonitrile are placed in a high-speed mixer, and mixed at 135° C. for 1.2 hours to obtain a mixture;

[0067] Step 2: placing the mixed material in a film blowing machine, blowing it into a film, and obtaining a polysilicon packaging film after cutting and packaging.

[0068] Comparative Example 4

[0069] Preparation of polysilicon packaging film

[0070] Step 1: Place 55 parts of ABS resin, 13 parts of terpene resin, 11 parts of hindered amine-modified polyvinyl butyral, 9 parts of polyetheretherketone, 2.5 parts of antioxidant 168, 4 parts of tridecyl phosphite, 2 parts of magnesium stearate, and 3 parts of azobisisoheptonitrile in a high-speed mixer, and mix at 135° C. for 1.2 hours to obtain a mixture;

[0071] Step 2: placing the mixed material in a film blowing machine, blowing it into a film, and obtaining a polysilicon packaging film after cutting and packaging.

[0072] Performance Testing

[0073] The polycrystalline silicon packaging films prepared in Examples 1 to 3 and Comparative Examples 1 to 4 were made into samples that met the specifications. The tensile strength of the samples was tested with reference to the standard GB / T1040.2-2022. The samples were exposed to ultraviolet light at a wavelength of 313 nm and an irradiance of 0.72 / m 2 After irradiation in a UV aging box for 24 hours, the tensile strength test is carried out again to determine the sample's UV resistance; the sample's impact strength is tested with reference to standard GB / T1043-2008 to determine the sample's impact resistance; the sample's Vicat softening temperature is tested with reference to standard GB / T1633-2000 to determine the sample's high temperature resistance; the sample's transmittance is tested using a LAMBDA35 spectrophotometer, and the specific test results are shown in the table below:

[0074]

[0075] It can be seen from the above table that the polycrystalline silicon packaging films prepared in Examples 1 to 3 have excellent tensile strength, anti-ultraviolet aging performance, and impact resistance, as well as good high temperature resistance and good light transmittance. The sample prepared in Comparative Example 1 did not contain functional polyetheretherketone, and had poor high temperature resistance. The sample prepared in Comparative Example 2 did not contain hindered amine-modified polyvinyl butyral, and had average anti-ultraviolet and impact resistance. The sample prepared in Comparative Example 3 directly contained polyvinyl butyral, and had poor anti-ultraviolet ability. The sample prepared in Comparative Example 4 directly contained polyetheretherketone, and its high temperature resistance was not as good as that of the examples.

[0076] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do 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. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0077] The above contents are merely examples and explanations of the concept of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the scope defined by the concept of the invention, they should all fall within the protection scope of the present invention.

Claims

1. A polycrystalline silicon packaging film, characterized in that: The invention comprises the following raw materials in parts by weight: 45-60 parts of ABS resin, 12-15 parts of terpene resin, 10-12 parts of hindered amine-modified polyvinyl butyral, 8-10 parts of functional polyetheretherketone, 2-3 parts of antioxidant, 3-5 parts of stabilizer, 2-5 parts of lubricant and 3-6 parts of initiator; The preparation method of the hindered amine modified polyvinyl butyral comprises the following steps: S1: placing polyvinyl butyral in toluene, adding itaconic anhydride and p-toluenesulfonic acid, heating to react, and removing the solvent after reduced pressure distillation to obtain modified polyvinyl butyral; S2: placing modified polyvinyl butyral and 4-amino-2,2,6,6-tetramethylpiperidine in xylene, adding a composite catalyst, heating to 65-75° C. for reaction for 5-6 hours, and collecting the product after reduced pressure distillation to obtain hindered amine modified polyvinyl butyral; The preparation method of the functional polyetheretherketone comprises the following steps: SS1: Place polyetheretherketone in chloroform, stir and mix thoroughly, introduce nitrogen, add bromoacetyl chloride and aluminum chloride, heat to reflux for reaction, collect the product after reduced pressure distillation, and obtain bromoethylated polyetheretherketone; SS2: Place bromoethylated polyetheretherketone in N,N-dimethylformamide, mix and stir thoroughly, then add 1,1,3,3-tetramethyl-1,3-divinyldisilazane and accelerator, heat to 65-70°C and react for 2-3h, remove the solvent by rotary evaporation, collect the product, and obtain functional polyetheretherketone.

2. The polycrystalline silicon packaging film according to claim 1, characterized in that: The antioxidant is any one of antioxidant 1010, antioxidant 168, and antioxidant 5057; the stabilizer is any one of triphenyl phosphite, tridecyl phosphite, and trinonyl phosphite; the lubricant is any one of sodium stearate and magnesium stearate; and the initiator is any one of azobisisobutyronitrile and azobisisoheptylnitrile.

3. The polycrystalline silicon packaging film according to claim 1, characterized in that: In step S1, the temperature of the temperature-raising reaction is 80-95° C. and the time is 3-5 hours.

4. The polycrystalline silicon packaging film according to claim 1, characterized in that: In step S2, the composite catalyst is 4-dimethylaminopyridine and N,N-dicyclohexylcarbodiimide in a mass ratio of 0.1-0.5:0.3-1.

5.

5. The polycrystalline silicon packaging film according to claim 1, characterized in that: In step SS1, the heating reflux reaction time is 10-12h.

6. The polycrystalline silicon packaging film according to claim 1, characterized in that: In step SS2, the accelerator is sodium bicarbonate.

7. The polycrystalline silicon packaging film according to claim 1, characterized in that: The method for preparing the polycrystalline silicon packaging film comprises the following preparation steps: Step 1, placing ABS resin, terpene resin, hindered amine-modified polyvinyl butyral, functional polyetheretherketone, antioxidant, stabilizer, lubricant, and initiator in a high-speed mixer, and mixing at 130-140° C. for 1-1.5 hours to obtain a mixture; Step 2: placing the mixed material in a film blowing machine, blowing it into a film, and obtaining a polysilicon packaging film after cutting and packaging.

8. Application of a polycrystalline silicon packaging film according to any one of claims 1 to 7, characterized in that: The polycrystalline silicon cell is placed in the polycrystalline silicon packaging film, and then vacuumized and sealed for packaging.

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