A polyethylene film having high peel strength and a method for preparing the same

Abstract

The application relates to a polyethylene film with high peeling strength and a preparation method thereof, characterized in that raw materials of the polyethylene film comprise polyethylene and inorganic additives; the inorganic additives are monodisperse mesoporous silica hollow sphere composites; and the peeling strength F of the polyethylene film is greater than 1.5 N. The polyethylene film has better peeling strength.

Description

Technical Field

[0001] This invention belongs to the field of polyethylene film technology, and particularly relates to a polyethylene film with high peel strength and its preparation method. Background Technology

[0002] Polyethylene (PE) is a high-molecular-weight linear alkane polymerized from ethylene monomers. It is the simplest resin in terms of molecular composition and structure. Due to its wide availability, non-toxicity, ease of processing, reprocessability, cold resistance, and moisture resistance, it has extensive applications in food and daily necessities packaging, as well as agricultural production. Polyethylene is currently the most produced plastic, and the use of polyethylene film is increasing year by year. However, the presence of non-polar groups in the polyethylene chain results in a relatively low cohesive energy density among plastic materials, and a relatively low surface energy (30-32 dynes / cm). Its surface inertness and hydrophobicity make it difficult to compound or mix with other materials, resulting in lower peel strength and thus limiting the application range of polyethylene films.

[0003] For example, a Chinese invention patent discloses a polyethylene film with high peel strength to the non-aluminized surface of VMPET and its preparation method [Application No.: 201710990655.1]. This invention patent is composed of the following substances calculated by weight percentage: 5-15% hydrogenated dimer acid / rosin-based polyester polyamide, 2-5% maleic anhydride-grafted polyethylene, and 80-93% polyethylene. The hydrogenated dimer acid / rosin-based polyester polyamide is prepared by reacting carboxyl-terminated polyamide and diol. The carboxyl-terminated polyamide is prepared by reacting hydrogenated dimer acid, maleic abrasive acid, and diamine. The weight ratio of hydrogenated dimer acid to maleic abrasive acid is 5:5 to 3:7. The ratio of the sum of the molar numbers of carboxyl groups in the hydrogenated dimer acid and maleic abrasive acid to the molar numbers of amino groups in the diamine is 1:0.6 to 0.8. The ratio of the molar numbers of hydroxyl groups in the diol to the molar numbers of carboxyl groups in the carboxyl-terminated polyamide is greater than or equal to 1.8:1.

[0004] The improvement made by this invention patent lies in the peel strength of the polyethylene film, and is limited to the peel strength between the polyethylene film and the non-aluminized side of the VMPET film, without any improvement in peel strength performance. Summary of the Invention

[0005] The purpose of this invention is to address the above-mentioned problems by providing a polyethylene film with high peel strength.

[0006] Another objective of this invention is to provide a method for preparing a polyethylene film with high peel strength, addressing the aforementioned problems.

[0007] To achieve the above objectives, the present invention adopts the following technical solutions:

[0008] A polyethylene film with high peel strength, characterized in that the raw material of the polyethylene film includes polyethylene and inorganic additives; the inorganic additives are monodisperse mesoporous silica hollow spheres composites; the monodisperse mesoporous silica hollow spheres composites are monodisperse mesoporous silica hollow spheres loaded with barium sulfate.

[0009] The peel strength F of polyethylene film is greater than 1.5 N.

[0010] The inorganic additives have a mass fraction of 5-9% in the raw materials of polyethylene film (a mixture of polyethylene and inorganic additives).

[0011] The inorganic additives account for 5-7% of the mass fraction in the raw materials of polyethylene film.

[0012] The mass fraction of inorganic additives in the raw materials of polyethylene film is 7-9%.

[0013] The peel strength F of polyethylene film is greater than 2.5 N.

[0014] The peel strength F of polyethylene film is greater than 3.5 N.

[0015] The peel strength F of polyethylene film is greater than 4.5 N.

[0016] The peel strength F of the polyethylene film is greater than 5.5 N.

[0017] A method for preparing a polyethylene film with high peel strength includes the following technical steps:

[0018] (1) Preparation of inorganic additives: Monodisperse mesoporous silica hollow spheres and barium chloride are dispersed in sulfuric acid aqueous solution, stirred by microwave, filtered, and dried to obtain monodisperse mesoporous silica hollow sphere composite.

[0019] In step (1),

[0020] The mass ratio of monodisperse mesoporous hollow silica spheres to barium chloride is 8:1 to 12:1;

[0021] The mass fraction of the sulfuric acid aqueous solution is 10% to 25%, and sulfuric acid is kept in excess.

[0022] (2) Preparation of spinning solvent containing inorganic additives: The monodisperse mesoporous silica hollow sphere composite obtained in step (1) is dispersed in hexanediol and stirred at high speed and ultrasonically dispersed. Finally, dichloromethane and 1,1,1,3,3-pentafluorobutane are added to obtain spinning solvent containing inorganic additives.

[0023] In step (2), the mass ratio of dichloromethane, hexanediol, and 1,1,1,3,3-pentafluorobutane is 7:2:1;

[0024] The mass concentration of the monodisperse mesoporous silica hollow sphere composite in hexanediol is 20-30 g / L. The addition of the monodisperse mesoporous silica hollow sphere composite to hexanediol is mainly to use hexanediol, one of the spinning solvents of this application, to perform surface treatment on the monodisperse mesoporous silica hollow sphere composite in order to improve its compatibility in polyethylene and make it uniformly dispersed in polyethylene.

[0025] The high-speed stirring speed is 2000-3000 rpm; the dispersion time is 2-3 hours.

[0026] (3) Preparation of spinning solution: Polyethylene is added to the spinning solvent containing inorganic additives prepared in step (2) and dispersed to obtain spinning solution;

[0027] In step (3), the mass fraction of polyethylene in the spinning solution is 6% to 18%;

[0028] The inorganic additives constitute 5–9% by mass in the raw materials of polyethylene film (a mixture of polyethylene and inorganic additives);

[0029] With the addition of inorganic additives, the peel strength of the polyethylene film continuously increases and eventually tends towards equilibrium. However, excessive addition of inorganic additives deteriorates the bending properties of the polyethylene film, resulting in a poorer feel and affecting product usability. Therefore, it is necessary to select an optimal range between peel strength and bending properties to meet the actual needs of the product.

[0030] (4) Preparation of waterproof polyethylene film: The spinning solution prepared in step (3) is flash spun and then hot-pressed to obtain a polyethylene film;

[0031] In step (4), the temperature of flash spinning is 160℃~230℃;

[0032] The hot pressing temperature is 110℃~120℃.

[0033] The testing standards for this application are as follows:

[0034] Peel strength: Industry standard FZ / T 80007.1-2006 uses the test method for peel strength of fused interlining garments.

[0035] Bending length: in accordance with GB / T 18318-2001 (Determination of bending length of textile fabrics).

[0036] Compared with the prior art, the positive effects of the present invention are:

[0037] 1. This invention improves the peel strength of polyethylene film by adding inorganic additives containing monodisperse mesoporous silica hollow spheres, thus expanding the application range of polyethylene film.

[0038] 2. By controlling the amount of inorganic additives containing monodisperse mesoporous silica hollow spheres, the present invention enables the polyethylene film to have a small bending length, thereby allowing the polyethylene film to maintain its proper feel. Detailed Implementation

[0039] The present invention will now be described in further detail with reference to specific embodiments.

[0040] Example 1

[0041] This embodiment provides a method for preparing a polyethylene film with high peel strength, the specific steps of which are as follows:

[0042] (1) Preparation of inorganic additives: Monodisperse mesoporous silica hollow spheres and barium chloride are dispersed in sulfuric acid aqueous solution, stirred by microwave, filtered, and dried to obtain monodisperse mesoporous silica hollow sphere composite.

[0043] In step (1),

[0044] The mass ratio of monodisperse mesoporous hollow silica spheres to barium chloride is 8:1;

[0045] The mass fraction of the sulfuric acid aqueous solution is 15%, and sulfuric acid is kept in excess.

[0046] (2) Preparation of spinning solvent containing inorganic additives: The monodisperse mesoporous silica hollow sphere composite obtained in step (1) is dispersed in hexanediol and stirred at high speed and ultrasonically dispersed. Finally, dichloromethane and 1,1,1,3,3-pentafluorobutane are added to obtain spinning solvent containing inorganic additives.

[0047] In step (2), the mass ratio of dichloromethane, hexanediol, and 1,1,1,3,3-pentafluorobutane is 7:2:1;

[0048] The mass concentration of the monodisperse mesoporous silica hollow sphere composite in hexanediol was 20 g / L.

[0049] The high-speed stirring speed is 2000-3000 rpm; the dispersion time is 2-3 hours.

[0050] (3) Preparation of spinning solution: Polyethylene is added to the spinning solvent containing inorganic additives prepared in step (2) and dispersed to obtain spinning solution;

[0051] In step (3), the mass fraction of polyethylene in the spinning solution is 8%;

[0052] The inorganic additives constitute 5% by mass in the raw materials of polyethylene film (a mixture of polyethylene and inorganic additives);

[0053] (4) Preparation of polyethylene film: The spinning solution prepared in step (3) is flash spun and then hot-pressed to obtain polyethylene film;

[0054] In step (4), the temperature of flash spinning is 190°C;

[0055] The hot pressing temperature is 110℃.

[0056] The test results of the polyethylene film prepared in this embodiment are shown in Table 1.

[0057] Example 2

[0058] This embodiment provides a method for preparing a polyethylene film with high peel strength, the specific steps of which are as follows:

[0059] (1) Preparation of inorganic additives: Monodisperse mesoporous silica hollow spheres and barium chloride are dispersed in sulfuric acid aqueous solution, stirred by microwave, filtered, and dried to obtain monodisperse mesoporous silica hollow sphere composite.

[0060] In step (1),

[0061] The mass ratio of monodisperse mesoporous hollow silica spheres to barium chloride is 10:1;

[0062] The mass fraction of the sulfuric acid aqueous solution is 15%, and sulfuric acid is kept in excess.

[0063] (2) Preparation of spinning solvent containing inorganic additives: The monodisperse mesoporous silica hollow sphere composite obtained in step (1) is dispersed in hexanediol and stirred at high speed and ultrasonically dispersed. Finally, dichloromethane and 1,1,1,3,3-pentafluorobutane are added to obtain spinning solvent containing inorganic additives.

[0064] In step (2), the mass ratio of dichloromethane, hexanediol, and 1,1,1,3,3-pentafluorobutane is 7:2:1;

[0065] The mass concentration of the monodisperse mesoporous silica hollow sphere composite in hexanediol was 25 g / L.

[0066] The high-speed stirring speed is 2000-3000 rpm; the dispersion time is 2-3 hours.

[0067] (3) Preparation of spinning solution: Polyethylene is added to the spinning solvent containing inorganic additives prepared in step (2) and dispersed to obtain spinning solution;

[0068] In step (3), the mass fraction of polyethylene in the spinning solution is 11%;

[0069] The inorganic additives constitute 7% by mass in the raw materials of polyethylene film (a mixture of polyethylene and inorganic additives);

[0070] (4) Preparation of polyethylene film: The spinning solution prepared in step (3) is flash spun and then hot-pressed to obtain polyethylene film;

[0071] In step (4), the temperature of flash spinning is 206°C;

[0072] The hot pressing temperature is 114℃.

[0073] The test results of the polyethylene film prepared in this embodiment are shown in Table 1.

[0074] Example 3

[0075] This embodiment provides a method for preparing a polyethylene film with high peel strength, the specific steps of which are as follows:

[0076] (1) Preparation of inorganic additives: Monodisperse mesoporous silica hollow spheres and barium chloride are dispersed in sulfuric acid aqueous solution, stirred by microwave, filtered, and dried to obtain monodisperse mesoporous silica hollow sphere composite.

[0077] In step (1),

[0078] The mass ratio of monodisperse mesoporous hollow silica spheres to barium chloride is 12:1;

[0079] The mass fraction of the sulfuric acid aqueous solution is 15%, and sulfuric acid is kept in excess.

[0080] (2) Preparation of spinning solvent containing inorganic additives: The monodisperse mesoporous silica hollow sphere composite obtained in step (1) is dispersed in hexanediol and stirred at high speed and ultrasonically dispersed. Finally, dichloromethane and 1,1,1,3,3-pentafluorobutane are added to obtain spinning solvent containing inorganic additives.

[0081] In step (2), the mass ratio of dichloromethane, hexanediol, and 1,1,1,3,3-pentafluorobutane is 7:2:1;

[0082] The mass concentration of the monodisperse mesoporous silica hollow sphere composite in hexanediol was 30 g / L.

[0083] The high-speed stirring speed is 2000-3000 rpm; the dispersion time is 2-3 hours.

[0084] (3) Preparation of spinning solution: Polyethylene is added to the spinning solvent containing inorganic additives prepared in step (2) and dispersed to obtain spinning solution;

[0085] In step (3), the mass fraction of polyethylene in the spinning solution is 14%;

[0086] The inorganic additives constitute 9% by mass in the raw materials of polyethylene film (a mixture of polyethylene and inorganic additives);

[0087] (4) Preparation of polyethylene film: The spinning solution prepared in step (3) is flash spun and then hot-pressed to obtain polyethylene film;

[0088] In step (4), the temperature of flash spinning is 220°C;

[0089] The hot pressing temperature is 118℃.

[0090] The test results of the polyethylene film prepared in this embodiment are shown in Table 1.

[0091] Comparative Example 1

[0092] This comparative example provides a method for preparing a polyethylene film, the specific steps of which are as follows:

[0093] (1) Preparation of spinning solution: Polyethylene is added to spinning solvent for dispersion to obtain spinning solution;

[0094] In step (1), the mass fraction of polyethylene in the spinning solution is 11%;

[0095] The spinning solvent is dichloromethane, hexanediol, and 1,1,1,3,3-pentafluorobutane in a mass ratio of 7:2:1;

[0096] (2) Preparation of polyethylene film: The spinning solution prepared in step (2) is flash spun and then hot-pressed to obtain polyethylene film;

[0097] In step (2), the temperature of flash spinning is 206°C;

[0098] The hot pressing temperature is 114℃.

[0099] The test results of the polyethylene film prepared in this comparative example are shown in Table 1.

[0100] Comparative Example 2

[0101] This comparative example provides a method for preparing a polyethylene film, the specific steps of which are as follows:

[0102] (1) Preparation of inorganic additives: Monodisperse mesoporous silica hollow spheres and barium chloride are dispersed in sulfuric acid aqueous solution, stirred by microwave, filtered, and dried to obtain monodisperse mesoporous silica hollow sphere composite.

[0103] In step (1),

[0104] The mass ratio of monodisperse mesoporous hollow silica spheres to barium chloride is 10:1;

[0105] The mass fraction of the sulfuric acid aqueous solution is 15%, and sulfuric acid is kept in excess.

[0106] (2) Preparation of spinning solvent containing inorganic additives: The monodisperse mesoporous silica hollow sphere composite obtained in step (1) is dispersed in hexanediol and stirred at high speed and ultrasonically dispersed. Finally, dichloromethane and 1,1,1,3,3-pentafluorobutane are added to obtain spinning solvent containing inorganic additives.

[0107] In step (2), the mass ratio of dichloromethane, hexanediol, and 1,1,1,3,3-pentafluorobutane is 7:2:1;

[0108] The mass concentration of the monodisperse mesoporous silica hollow sphere composite in hexanediol was 25 g / L.

[0109] The high-speed stirring speed is 2000-3000 rpm; the dispersion time is 2-3 hours.

[0110] (3) Preparation of spinning solution: Polyethylene is added to the spinning solvent containing inorganic additives prepared in step (2) and dispersed to obtain spinning solution;

[0111] In step (3), the mass fraction of polyethylene in the spinning solution is 11%;

[0112] The inorganic additives constitute 2% by mass in the raw materials of polyethylene film (a mixture of polyethylene and inorganic additives);

[0113] (4) Preparation of polyethylene film: The spinning solution prepared in step (3) is flash spun and then hot-pressed to obtain polyethylene film;

[0114] In step (4), the temperature of flash spinning is 206°C;

[0115] The hot pressing temperature is 114℃.

[0116] The test results of the polyethylene film prepared in this comparative example are shown in Table 1.

[0117] Comparative Example 3

[0118] This comparative example provides a method for preparing a polyethylene film, the specific steps of which are as follows:

[0119] (1) Preparation of inorganic additives: Monodisperse mesoporous silica hollow spheres and barium chloride are dispersed in sulfuric acid aqueous solution, stirred by microwave, filtered, and dried to obtain monodisperse mesoporous silica hollow sphere composite.

[0120] In step (1),

[0121] The mass ratio of monodisperse mesoporous hollow silica spheres to barium chloride is 10:1;

[0122] The mass fraction of the sulfuric acid aqueous solution is 15%, and sulfuric acid is kept in excess.

[0123] (2) Preparation of spinning solvent containing inorganic additives: The monodisperse mesoporous silica hollow sphere composite obtained in step (1) is dispersed in hexanediol and stirred at high speed and ultrasonically dispersed. Finally, dichloromethane and 1,1,1,3,3-pentafluorobutane are added to obtain spinning solvent containing inorganic additives.

[0124] In step (2), the mass ratio of dichloromethane, hexanediol, and 1,1,1,3,3-pentafluorobutane is 7:2:1;

[0125] The mass concentration of the monodisperse mesoporous silica hollow sphere composite in hexanediol was 25 g / L.

[0126] The high-speed stirring speed is 2000-3000 rpm; the dispersion time is 2-3 hours.

[0127] (3) Preparation of spinning solution: Polyethylene is added to the spinning solvent containing inorganic additives prepared in step (2) and dispersed to obtain spinning solution;

[0128] In step (3), the mass fraction of polyethylene in the spinning solution is 11%;

[0129] The inorganic additives constitute 11% by mass in the raw materials of polyethylene film (a mixture of polyethylene and inorganic additives);

[0130] (4) Preparation of polyethylene film: The spinning solution prepared in step (3) is flash spun and then hot-pressed to obtain polyethylene film;

[0131] In step (4), the temperature of flash spinning is 206°C;

[0132] The hot pressing temperature is 114℃.

[0133] The test results of the polyethylene film prepared in this comparative example are shown in Table 1.

[0134] Comparative Example 4

[0135] This comparative example provides a method for preparing a polyethylene film, the specific steps of which are as follows:

[0136] (1) Preparation of inorganic additives: Monodisperse mesoporous silica hollow spheres and barium chloride are dispersed in sulfuric acid aqueous solution, stirred by microwave, filtered, and dried to obtain monodisperse mesoporous silica hollow sphere composite.

[0137] In step (1),

[0138] The mass ratio of monodisperse mesoporous hollow silica spheres to barium chloride is 10:1;

[0139] The mass fraction of the sulfuric acid aqueous solution is 15%, and sulfuric acid is kept in excess.

[0140] (2) Preparation of spinning solvent containing inorganic additives: The monodisperse mesoporous silica hollow sphere composite obtained in step (1) is dispersed in hexanediol and stirred at high speed and ultrasonically dispersed. Finally, dichloromethane and 1,1,1,3,3-pentafluorobutane are added to obtain spinning solvent containing inorganic additives.

[0141] In step (2), the mass ratio of dichloromethane, hexanediol, and 1,1,1,3,3-pentafluorobutane is 7:2:1;

[0142] The mass concentration of the monodisperse mesoporous silica hollow sphere composite in hexanediol was 25 g / L.

[0143] The high-speed stirring speed is 2000-3000 rpm; the dispersion time is 2-3 hours.

[0144] (3) Preparation of spinning solution: Polyethylene is added to the spinning solvent containing inorganic additives prepared in step (2) and dispersed to obtain spinning solution;

[0145] In step (3), the mass fraction of polyethylene in the spinning solution is 11%;

[0146] The inorganic additives constitute 13% by mass in the raw materials of polyethylene film (a mixture of polyethylene and inorganic additives);

[0147] (4) Preparation of polyethylene film: The spinning solution prepared in step (3) is flash spun and then hot-pressed to obtain polyethylene film;

[0148] In step (4), the temperature of flash spinning is 206°C;

[0149] The hot pressing temperature is 114℃.

[0150] The test results of the polyethylene film prepared in this comparative example are shown in Table 1.

[0151] Comparative Example 5

[0152] This comparative example provides a method for preparing a polyethylene film, the specific steps of which are as follows:

[0153] (1) Preparation of inorganic additives: Monodisperse mesoporous hollow silica spheres and barium sulfate were directly mixed to obtain a monodisperse mesoporous hollow silica sphere composite.

[0154] In step (1), the mass ratio of monodisperse mesoporous silica hollow spheres to barium sulfate is 10:1;

[0155] (2) Preparation of spinning solvent containing inorganic additives: The monodisperse mesoporous silica hollow sphere composite obtained in step (1) is dispersed in hexanediol and stirred at high speed and ultrasonically dispersed. Finally, dichloromethane and 1,1,1,3,3-pentafluorobutane are added to obtain spinning solvent containing inorganic additives.

[0156] In step (2), the mass ratio of dichloromethane, hexanediol, and 1,1,1,3,3-pentafluorobutane is 7:2:1;

[0157] The mass concentration of the monodisperse mesoporous silica hollow sphere composite in hexanediol was 25 g / L.

[0158] The high-speed stirring speed is 2000-3000 rpm; the dispersion time is 2-3 hours.

[0159] (3) Preparation of spinning solution: Polyethylene is added to the spinning solvent containing inorganic additives prepared in step (2) and dispersed to obtain spinning solution;

[0160] In step (3), the mass fraction of polyethylene in the spinning solution is 11%;

[0161] The inorganic additives constitute 7% by mass in the raw materials of polyethylene film (a mixture of polyethylene and inorganic additives);

[0162] (4) Preparation of polyethylene film: The spinning solution prepared in step (3) is flash spun and then hot-pressed to obtain polyethylene film;

[0163] In step (4), the temperature of flash spinning is 206°C;

[0164] The hot pressing temperature is 114℃.

[0165] The test results of the polyethylene film prepared in this comparative example are shown in Table 1.

[0166] Table 1 Test Data Table of this Application

[0167] Peeling strength N Bending length (cm) Example 1 2.8 6.2 Example 2 3.9 6.8 Example 3 5.3 7.6 Comparative Example 1 0.8 4.5 Comparative Example 2 1.3 5.2 Comparative Example 3 5.9 10.0 Comparative Example 4 6.2 11.0 Comparative Example 5 1.1 4.9

[0168] Results Analysis: The experimental results show that with the addition of inorganic additives, the peel strength of the resulting polyethylene film increases simultaneously, while the bending length decreases. Therefore, the inorganic additives provided in this invention, with their addition limited to a mass fraction of 5-9% in the polyethylene film raw materials, allow for the production of polyethylene films that balance both peel strength and bending length, achieving the intended purpose of this invention.

[0169] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A polyethylene film with high peel strength, characterized in that: The raw material of the polyethylene film includes polyethylene and inorganic additives, the inorganic additives including a monodisperse mesoporous silica hollow sphere composite, the peel strength F of the polyethylene film is greater than 1.5N; the monodisperse mesoporous silica hollow sphere composite is a monodisperse mesoporous silica hollow sphere loaded with barium sulfate. High peel strength polyethylene film is prepared by the following method: Step 1: Preparation of inorganic additives. Monodisperse mesoporous hollow silica spheres and barium chloride are dispersed in sulfuric acid aqueous solution. After microwave stirring and reaction, the mixture is filtered and dried to obtain a monodisperse mesoporous hollow silica sphere composite. Step 2: Preparation of spinning solvent containing inorganic additives. The monodisperse mesoporous silica hollow sphere composite obtained in Step 1 is dispersed in hexanediol and stirred at high speed and ultrasonically dispersed. Finally, dichloromethane and 1,1,1,3,3-pentafluorobutane are added to obtain spinning solvent containing inorganic additives. Step 3: Preparation of spinning solution. Polyethylene is added to the spinning solvent containing inorganic auxiliaries prepared in Step 2 and dispersed to obtain the spinning solution. Step 4: Preparation of polyethylene film. The spinning solution prepared in step 3 is flash spun and then hot-pressed to obtain polyethylene film.

2. The polyethylene film with high peel strength as described in claim 1, characterized in that: The inorganic additive has a mass fraction of 5-9% in the raw materials of the polyethylene film.

3. A polyethylene film with high peel strength as described in claim 2, characterized in that: The inorganic additive has a mass fraction of 5-7% in the raw materials of the polyethylene film.

4. A polyethylene film with high peel strength as described in claim 2, characterized in that: The inorganic additive has a mass fraction of 7-9% in the raw materials of the polyethylene film.

5. A polyethylene film with high peel strength as described in claim 1, characterized in that: The peel strength F of the polyethylene film is greater than 2.5 N.

6. A polyethylene film with high peel strength as described in claim 1, characterized in that: The peel strength F of the polyethylene film is greater than 3.5 N.

7. A polyethylene film with high peel strength as described in claim 1, characterized in that: The peel strength F of the polyethylene film is greater than 4.5 N.

8. A polyethylene film with high peel strength as described in claim 1, characterized in that: The peel strength F of the polyethylene film is greater than 5.5 N.

9. A method for preparing a polyethylene film with high peel strength as described in any one of claims 1-8, characterized in that, Includes the following steps: Step 1: Preparation of inorganic additives. Monodisperse mesoporous hollow silica spheres and barium chloride are dispersed in sulfuric acid aqueous solution. After microwave stirring and reaction, the mixture is filtered and dried to obtain a monodisperse mesoporous hollow silica sphere composite. Step 2: Preparation of spinning solvent containing inorganic additives. The monodisperse mesoporous silica hollow sphere composite obtained in Step 1 is dispersed in hexanediol and stirred at high speed and ultrasonically dispersed. Finally, dichloromethane and 1,1,1,3,3-pentafluorobutane are added to obtain spinning solvent containing inorganic additives. Step 3: Preparation of spinning solution. Polyethylene is added to the spinning solvent containing inorganic auxiliaries prepared in Step 2 and dispersed to obtain the spinning solution. Step 4: Preparation of polyethylene film. The spinning solution prepared in step 3 is flash spun and then hot-pressed to obtain polyethylene film.

10. The preparation method according to claim 9, characterized in that: The stirring speed in step two is 2000-3000 rpm, and the dispersion time is 2-3 h; the mass ratio of dichloromethane, hexanediol and 1,1,1,3,3-pentafluorobutane is 7:2:1.