A dustproof and antibacterial agricultural film and preparation method thereof

Abstract

The invention relates to the technical field of thin films, and proposes a dustproof and antibacterial agricultural film and a preparation method thereof. The agricultural film comprises an upper surface layer, a first buffer layer, an intermediate layer, a second buffer layer and a lower surface layer; the upper surface layer comprises: 60-80 parts of PE, 1-3 parts of mica powder, 0.5-2.5 parts of aluminum powder, 5-10 parts of glass fiber, and 9-12 parts of silver ion antibacterial agent; the first buffer layer comprises: 60-80 parts of PBAT, 25-45 parts of PE, and 1-7 parts of a compound containing an imino group and a nitrile group; the intermediate layer comprises: 30-50 parts of PBAT, 0.5-4 parts of glass fiber; the second buffer layer comprises: 70-90 parts of PBAT, 15-25 parts of PE, and 1-5 parts of a dinitrile compound; the lower surface layer comprises: 50-70 parts of PE, and 3-6 parts of a silver ion antibacterial agent. Through the above technical scheme, the problems of low strength and non-degradability of agricultural films in the related art are solved.

Description

Technical Field

[0001] The invention relates to the technical field of films, and in particular to a dustproof and antibacterial agricultural film and a preparation method thereof. Background Art

[0002] The use of agricultural film can improve the control of light, heat and water in crop production factors, and has a significant yield-increasing effect. It is widely used in the production of vegetables, fruits, flowers and other crops, and has multiple functions such as heat preservation, moisture retention, sun protection and insect prevention.

[0003] At present, agricultural films are mainly made of polyethylene and polyvinyl chloride. Polyvinyl chloride agricultural films are not popular among the public because they contain halogens that pollute the environment. Polyethylene agricultural films are widely used due to their transparency, softness, aging resistance, and ease of use. However, they have problems such as low strength and are not easy to degrade. Summary of the invention

[0004] The invention provides a dustproof and antibacterial agricultural film and a preparation method thereof, which solves the problems of low strength and non-degradability of agricultural films in the related art.

[0005] The technical solution of the present invention is as follows:

[0006] A dustproof and antibacterial agricultural film, comprising, from top to bottom, an upper surface layer, a first buffer layer, an intermediate layer, a second buffer layer and a lower surface layer;

[0007] The raw materials of the upper surface layer include the following components in parts by mass: 60-80 parts of PE, 1-3 parts of mica powder, 0.5-2.5 parts of aluminum powder, 5-10 parts of glass fiber, and 9-12 parts of silver ion antibacterial agent;

[0008] The raw materials of the first buffer layer include the following components in parts by weight: 60-80 parts of PBAT, 25-45 parts of PE, and 1-7 parts of a compound containing an imino group and a nitrile group;

[0009] The raw materials of the intermediate layer include the following components in parts by weight: 30-50 parts of PBAT and 0.5-4 parts of glass fiber;

[0010] The raw materials of the second buffer layer include the following components in parts by weight: 70-90 parts of PBAT, 15-25 parts of PE, and 1-5 parts of dinitrile compound;

[0011] The raw materials of the lower surface layer include the following components in parts by weight: 50-70 parts of PE and 3-6 parts of silver ion antibacterial agent.

[0012] In the present invention, PBAT is a copolymer of butylene adipate and butylene terephthalate; PE is polyethylene.

[0013] As a further technical solution, the compound containing an imino group and a nitrile group can be any compound containing an imino group and a nitrile group, preferably one or two of iminodiacetonitrile and 3-(phenylamino)propionitrile, and more preferably iminodiacetonitrile.

[0014] As a further technical solution, the mass ratio of the mica powder and the aluminum powder to the glass fiber is 2.5-4.5:8.

[0015] The invention limits the mass ratio of mica powder and aluminum powder to glass fiber to 2.5-4.5:8, thereby further improving the strength of the agricultural film.

[0016] As a further technical solution, the mass ratio of the mica powder, aluminum powder and glass fiber to the compound containing imino groups and nitrile groups is 11.5:3-5.

[0017] The invention limits the mass ratio of mica powder, aluminum powder and glass fiber to the mass ratio of the compound containing imino group and nitrile group to 11.5:3-5, thereby further improving the strength of the agricultural film.

[0018] As a further technical solution, the glass fiber in the middle layer is methylaminosilane-modified glass fiber.

[0019] The present invention limits the glass fiber in the middle layer to methylaminosilane-modified glass fiber, thereby further improving the strength of the agricultural film.

[0020] As a further technical solution, the raw materials of the methylaminosilane-modified glass fiber include methylaminosilane and glass fiber in a mass ratio of 0.1 to 0.5:1.

[0021] As a further technical solution, the methylaminosilane is any silane containing a methylamino group, preferably KH550.

[0022] As a further technical solution, the dinitrile compound can be any compound containing two nitrile groups, preferably one or more of adiponitrile, succinonitrile, pimelonitrile, suberonitrile, and sebaconitrile.

[0023] As a further technical solution, the mass ratio of the glass fiber to the dinitrile compound in the intermediate layer is 2:3.

[0024] The present invention limits the mass ratio of the glass fiber to the dinitrile compound in the middle layer to 2:3, thereby further improving the strength of the agricultural film.

[0025] The present invention also proposes a method for preparing a dustproof and antibacterial agricultural film, comprising the following steps: respectively melting and mixing the raw materials of the upper surface layer, the first buffer layer, the middle layer, the second buffer layer and the lower surface layer, co-extruding and blow molding to obtain the dustproof and antibacterial agricultural film.

[0026] The working principle and beneficial effects of the present invention are:

[0027] The present invention provides a dustproof and antibacterial agricultural film with a five-layer structure, including an upper surface layer, a first buffer layer, an intermediate layer, a second buffer layer and a lower surface layer. By optimizing the raw materials and ratios of each layer, the inner and interlayer bonding strengths are improved, thereby improving the strength of the agricultural film. In addition, the addition of the degradable material PBAT solves the problem of the agricultural film being difficult to degrade in the prior art, achieving the effect of not only high strength but also easy degradation. DETAILED DESCRIPTION

[0028] The following will be combined with 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.

[0029] The parameters of the raw materials in the following examples and comparative examples are as follows:

[0030] PBAT is PBAT TH801T;

[0031] PE is HDPE 9001;

[0032] The mica powder is 1200 mesh mica powder;

[0033] The aluminum powder is 800 mesh aluminum powder;

[0034] The glass fiber has a length of 0.5 mm and a diameter of 9 μm.

[0035] Example 1

[0036] S1. Mix 70 parts of PE, 1 part of mica powder, 0.5 parts of aluminum powder, 8 parts of glass fiber, and 10 parts of silver ion antibacterial agent at 160° C. to obtain the upper surface layer raw material;

[0037] S2, 70 parts of PBAT, 35 parts of PE, and 1 part of 3-(phenylamino)propionitrile were mixed uniformly at 160° C. to obtain a first buffer layer raw material;

[0038] S3, 40 parts of PBAT and 2 parts of glass fiber were mixed evenly at 130° C. to obtain a middle layer raw material;

[0039] S4, 80 parts of PBAT, 20 parts of PE, and 1 part of adiponitrile were mixed uniformly at 160° C. to obtain a second buffer layer raw material;

[0040] S5, 60 parts of PE and 4.5 parts of silver ion antibacterial agent were mixed uniformly at 160° C. to obtain a lower surface layer raw material;

[0041] S6. Co-extrude the upper surface layer raw material, the first buffer layer raw material, the middle layer raw material, the second buffer layer raw material and the lower surface layer raw material, and blow mold to obtain an agricultural film with a thickness ratio of upper surface layer: first buffer layer: middle layer: second buffer layer: lower surface layer of 0.5:1:1:1:0.5.

[0042] Example 2

[0043] S1. Mix 60 parts of PE, 1 part of mica powder, 0.5 parts of aluminum powder, 5 parts of glass fiber, and 9 parts of silver ion antibacterial agent at 160° C. to obtain the upper surface layer raw material;

[0044] S2, 60 parts of PBAT, 45 parts of PE, and 1 part of 3-(phenylamino)propionitrile were mixed uniformly at 160° C. to obtain a first buffer layer raw material;

[0045] S3, 30 parts of PBAT and 0.5 parts of glass fiber were mixed evenly at 130° C. to obtain a middle layer raw material;

[0046] S4, mixing 70 parts of PBAT, 25 parts of PE, and 1 part of adiponitrile at 160° C. to obtain a second buffer layer raw material;

[0047] S5, 50 parts of PE and 3 parts of silver ion antibacterial agent were mixed uniformly at 160° C. to obtain a lower surface layer raw material;

[0048] S6. Co-extrude the upper surface layer raw material, the first buffer layer raw material, the middle layer raw material, the second buffer layer raw material and the lower surface layer raw material, and blow mold to obtain an agricultural film with a thickness ratio of upper surface layer: first buffer layer: middle layer: second buffer layer: lower surface layer of 0.5:1:1:1:0.5.

[0049] Example 3

[0050] S1. Mix 80 parts of PE, 1 part of mica powder, 0.5 parts of aluminum powder, 10 parts of glass fiber, and 12 parts of silver ion antibacterial agent at 160° C. to obtain the upper surface layer raw material;

[0051] S2, 80 parts of PBAT, 25 parts of PE, and 1 part of 3-(phenylamino)propionitrile were mixed uniformly at 160° C. to obtain a first buffer layer raw material;

[0052] S3, 50 parts of PBAT and 4 parts of glass fiber were mixed evenly at 130° C. to obtain a middle layer raw material;

[0053] S4, 90 parts of PBAT, 15 parts of PE, and 1 part of adiponitrile were mixed uniformly at 160° C. to obtain a second buffer layer raw material;

[0054] S5, 70 parts of PE and 6 parts of silver ion antibacterial agent were mixed uniformly at 160° C. to obtain a lower surface layer raw material;

[0055] S6. Co-extrude the upper surface layer raw material, the first buffer layer raw material, the middle layer raw material, the second buffer layer raw material and the lower surface layer raw material, and blow mold to obtain an agricultural film with a thickness ratio of upper surface layer: first buffer layer: middle layer: second buffer layer: lower surface layer of 0.5:1:1:1:0.5.

[0056] Example 4

[0057] S1. Mix 70 parts of PE, 1 part of mica powder, 0.5 parts of aluminum powder, 8 parts of glass fiber, and 10 parts of silver ion antibacterial agent at 160° C. to obtain the upper surface layer raw material;

[0058] S2, 70 parts of PBAT, 35 parts of PE, and 1 part of iminodiacetonitrile were mixed uniformly at 160° C. to obtain a first buffer layer raw material;

[0059] S3, 40 parts of PBAT and 2 parts of glass fiber were mixed evenly at 130° C. to obtain a middle layer raw material;

[0060] S4, 80 parts of PBAT, 20 parts of PE, and 1 part of adiponitrile were mixed uniformly at 160° C. to obtain a second buffer layer raw material;

[0061] S5, 60 parts of PE and 4.5 parts of silver ion antibacterial agent were mixed uniformly at 160° C. to obtain a lower surface layer raw material;

[0062] S6. Co-extrude the upper surface layer raw material, the first buffer layer raw material, the middle layer raw material, the second buffer layer raw material and the lower surface layer raw material, and blow mold to obtain an agricultural film with a thickness ratio of upper surface layer: first buffer layer: middle layer: second buffer layer: lower surface layer of 0.5:1:1:1:0.5.

[0063] Example 5

[0064] S1. Mix 70 parts of PE, 1.5 parts of mica powder, 1 part of aluminum powder, 8 parts of glass fiber, and 10 parts of silver ion antibacterial agent at 160° C. to obtain the upper surface layer raw material;

[0065] S2, 70 parts of PBAT, 35 parts of PE, and 1 part of iminodiacetonitrile were mixed uniformly at 160° C. to obtain a first buffer layer raw material;

[0066] S3, 40 parts of PBAT and 2 parts of glass fiber were mixed evenly at 130° C. to obtain a middle layer raw material;

[0067] S4, 80 parts of PBAT, 20 parts of PE, and 1 part of adiponitrile were mixed uniformly at 160° C. to obtain a second buffer layer raw material;

[0068] S5, 60 parts of PE and 4.5 parts of silver ion antibacterial agent were mixed uniformly at 160° C. to obtain a lower surface layer raw material;

[0069] S6. Co-extrude the upper surface layer raw material, the first buffer layer raw material, the middle layer raw material, the second buffer layer raw material and the lower surface layer raw material, and blow mold to obtain an agricultural film with a thickness ratio of upper surface layer: first buffer layer: middle layer: second buffer layer: lower surface layer of 0.5:1:1:1:0.5.

[0070] Example 6

[0071] S1. Mix 70 parts of PE, 2 parts of mica powder, 1.5 parts of aluminum powder, 8 parts of glass fiber and 10 parts of silver ion antibacterial agent at 160° C. to obtain the upper surface layer raw material;

[0072] S2, 70 parts of PBAT, 35 parts of PE, and 1 part of iminodiacetonitrile were mixed uniformly at 160° C. to obtain a first buffer layer raw material;

[0073] S3, 40 parts of PBAT and 2 parts of glass fiber were mixed evenly at 130° C. to obtain a middle layer raw material;

[0074] S4, 80 parts of PBAT, 20 parts of PE, and 1 part of adiponitrile were mixed uniformly at 160° C. to obtain a second buffer layer raw material;

[0075] S5, 60 parts of PE and 4.5 parts of silver ion antibacterial agent were mixed uniformly at 160° C. to obtain a lower surface layer raw material;

[0076] S6. Co-extrude the upper surface layer raw material, the first buffer layer raw material, the middle layer raw material, the second buffer layer raw material and the lower surface layer raw material, and blow mold to obtain an agricultural film with a thickness ratio of upper surface layer: first buffer layer: middle layer: second buffer layer: lower surface layer of 0.5:1:1:1:0.5.

[0077] Example 7

[0078] S1. Mix 70 parts of PE, 2.5 parts of mica powder, 2 parts of aluminum powder, 8 parts of glass fiber and 10 parts of silver ion antibacterial agent at 160° C. to obtain the upper surface layer raw material;

[0079] S2, 70 parts of PBAT, 35 parts of PE, and 1 part of iminodiacetonitrile were mixed uniformly at 160° C. to obtain a first buffer layer raw material;

[0080] S3, 40 parts of PBAT and 2 parts of glass fiber were mixed evenly at 130° C. to obtain a middle layer raw material;

[0081] S4, 80 parts of PBAT, 20 parts of PE, and 1 part of adiponitrile were mixed uniformly at 160° C. to obtain a second buffer layer raw material;

[0082] S5, 60 parts of PE and 4.5 parts of silver ion antibacterial agent were mixed uniformly at 160° C. to obtain a lower surface layer raw material;

[0083] S6. Co-extrude the upper surface layer raw material, the first buffer layer raw material, the middle layer raw material, the second buffer layer raw material and the lower surface layer raw material, and blow mold to obtain an agricultural film with a thickness ratio of upper surface layer: first buffer layer: middle layer: second buffer layer: lower surface layer of 0.5:1:1:1:0.5.

[0084] Example 8

[0085] S1. Mix 70 parts of PE, 3 parts of mica powder, 2.5 parts of aluminum powder, 8 parts of glass fiber and 10 parts of silver ion antibacterial agent at 160° C. to obtain the upper surface layer raw material;

[0086] S2, 70 parts of PBAT, 35 parts of PE, and 1 part of iminodiacetonitrile were mixed uniformly at 160° C. to obtain a first buffer layer raw material;

[0087] S3, 40 parts of PBAT and 2 parts of glass fiber were mixed evenly at 130° C. to obtain a middle layer raw material;

[0088] S4, 80 parts of PBAT, 20 parts of PE, and 1 part of adiponitrile were mixed uniformly at 160° C. to obtain a second buffer layer raw material;

[0089] S5, 60 parts of PE and 4.5 parts of silver ion antibacterial agent were mixed uniformly at 160° C. to obtain a lower surface layer raw material;

[0090] S6. Co-extrude the upper surface layer raw material, the first buffer layer raw material, the middle layer raw material, the second buffer layer raw material and the lower surface layer raw material, and blow mold to obtain an agricultural film with a thickness ratio of upper surface layer: first buffer layer: middle layer: second buffer layer: lower surface layer of 0.5:1:1:1:0.5.

[0091] Example 9

[0092] S1. Mix 70 parts of PE, 2 parts of mica powder, 1.5 parts of aluminum powder, 8 parts of glass fiber and 10 parts of silver ion antibacterial agent at 160° C. to obtain the upper surface layer raw material;

[0093] S2, 70 parts of PBAT, 35 parts of PE, and 3 parts of iminodiacetonitrile were mixed uniformly at 160° C. to obtain a first buffer layer raw material;

[0094] S3, 40 parts of PBAT and 2 parts of glass fiber were mixed evenly at 130° C. to obtain a middle layer raw material;

[0095] S4, 80 parts of PBAT, 20 parts of PE, and 1 part of adiponitrile were mixed uniformly at 160° C. to obtain a second buffer layer raw material;

[0096] S5, 60 parts of PE and 4.5 parts of silver ion antibacterial agent were mixed uniformly at 160° C. to obtain a lower surface layer raw material;

[0097] S6. Co-extrude the upper surface layer raw material, the first buffer layer raw material, the middle layer raw material, the second buffer layer raw material and the lower surface layer raw material, and blow mold to obtain an agricultural film with a thickness ratio of upper surface layer: first buffer layer: middle layer: second buffer layer: lower surface layer of 0.5:1:1:1:0.5.

[0098] Example 10

[0099] S1. Mix 70 parts of PE, 2 parts of mica powder, 1.5 parts of aluminum powder, 8 parts of glass fiber and 10 parts of silver ion antibacterial agent at 160° C. to obtain the upper surface layer raw material;

[0100] S2, 70 parts of PBAT, 35 parts of PE, and 5 parts of iminodiacetonitrile were mixed uniformly at 160° C. to obtain a first buffer layer raw material;

[0101] S3, 40 parts of PBAT and 2 parts of glass fiber were mixed evenly at 130° C. to obtain a middle layer raw material;

[0102] S4, 80 parts of PBAT, 20 parts of PE, and 1 part of adiponitrile were mixed uniformly at 160° C. to obtain a second buffer layer raw material;

[0103] S5, 60 parts of PE and 4.5 parts of silver ion antibacterial agent were mixed uniformly at 160° C. to obtain a lower surface layer raw material;

[0104] S6. Co-extrude the upper surface layer raw material, the first buffer layer raw material, the middle layer raw material, the second buffer layer raw material and the lower surface layer raw material, and blow mold to obtain an agricultural film with a thickness ratio of upper surface layer: first buffer layer: middle layer: second buffer layer: lower surface layer of 0.5:1:1:1:0.5.

[0105] Embodiment 11

[0106] S1. Mix 70 parts of PE, 2 parts of mica powder, 1.5 parts of aluminum powder, 8 parts of glass fiber and 10 parts of silver ion antibacterial agent at 160° C. to obtain the upper surface layer raw material;

[0107] S2, 70 parts of PBAT, 35 parts of PE, and 7 parts of iminodiacetonitrile were mixed uniformly at 160° C. to obtain a first buffer layer raw material;

[0108] S3, 40 parts of PBAT and 2 parts of glass fiber were mixed evenly at 130° C. to obtain a middle layer raw material;

[0109] S4, 80 parts of PBAT, 20 parts of PE, and 1 part of adiponitrile were mixed uniformly at 160° C. to obtain a second buffer layer raw material;

[0110] S5, 60 parts of PE and 4.5 parts of silver ion antibacterial agent were mixed uniformly at 160° C. to obtain a lower surface layer raw material;

[0111] S6. Co-extrude the upper surface layer raw material, the first buffer layer raw material, the middle layer raw material, the second buffer layer raw material and the lower surface layer raw material, and blow mold to obtain an agricultural film with a thickness ratio of upper surface layer: first buffer layer: middle layer: second buffer layer: lower surface layer of 0.5:1:1:1:0.5.

[0112] Example 12

[0113] S0, mix 10g of glass fiber with 150g of water, stir at 5000rpm for 5h, heat to 50°C, adjust the speed to 500rpm, add 1g of KH550 and continue stirring for 2h, filter, wash with water, and dry to obtain methylaminosilane-modified glass fiber;

[0114] S1. Mix 70 parts of PE, 2 parts of mica powder, 1.5 parts of aluminum powder, 8 parts of glass fiber and 10 parts of silver ion antibacterial agent at 160° C. to obtain the upper surface layer raw material;

[0115] S2, 70 parts of PBAT, 35 parts of PE, and 5 parts of iminodiacetonitrile were mixed uniformly at 160° C. to obtain a first buffer layer raw material;

[0116] S3, 40 parts of PBAT and 2 parts of methylaminosilane-modified glass fiber were mixed uniformly at 130° C. to obtain a middle layer raw material;

[0117] S4, 80 parts of PBAT, 20 parts of PE, and 1 part of adiponitrile were mixed uniformly at 160° C. to obtain a second buffer layer raw material;

[0118] S5, 60 parts of PE and 4.5 parts of silver ion antibacterial agent were mixed uniformly at 160° C. to obtain a lower surface layer raw material;

[0119] S6. Co-extrude the upper surface layer raw material, the first buffer layer raw material, the middle layer raw material, the second buffer layer raw material and the lower surface layer raw material, and blow mold to obtain an agricultural film with a thickness ratio of upper surface layer: first buffer layer: middle layer: second buffer layer: lower surface layer of 0.5:1:1:1:0.5.

[0120] Embodiment 13

[0121] S0, mix 10g of glass fiber with 150g of water, stir at 5000rpm for 5h, heat to 50°C, adjust the speed to 500rpm, add 1g of KH550 and continue stirring for 2h, filter, wash with water, and dry to obtain methylaminosilane-modified glass fiber;

[0122] S1. Mix 70 parts of PE, 2 parts of mica powder, 1.5 parts of aluminum powder, 8 parts of glass fiber and 10 parts of silver ion antibacterial agent at 160° C. to obtain the upper surface layer raw material;

[0123] S2, 70 parts of PBAT, 35 parts of PE, and 5 parts of iminodiacetonitrile were mixed uniformly at 160° C. to obtain a first buffer layer raw material;

[0124] S3, 40 parts of PBAT and 2 parts of methylaminosilane-modified glass fiber were mixed uniformly at 130° C. to obtain a middle layer raw material;

[0125] S4, 80 parts of PBAT, 20 parts of PE, and 3 parts of adiponitrile were mixed uniformly at 160° C. to obtain a second buffer layer raw material;

[0126] S5, 60 parts of PE and 4.5 parts of silver ion antibacterial agent were mixed uniformly at 160° C. to obtain a lower surface layer raw material;

[0127] S6. Co-extrude the upper surface layer raw material, the first buffer layer raw material, the middle layer raw material, the second buffer layer raw material and the lower surface layer raw material, and blow mold to obtain an agricultural film with a thickness ratio of upper surface layer: first buffer layer: middle layer: second buffer layer: lower surface layer of 0.5:1:1:1:0.5.

[0128] Embodiment 14

[0129] S0, mix 10g of glass fiber with 150g of water, stir at 5000rpm for 5h, heat to 50°C, adjust the speed to 500rpm, add 1g of KH550 and continue stirring for 2h, filter, wash with water, and dry to obtain methylaminosilane-modified glass fiber;

[0130] S1. Mix 70 parts of PE, 2 parts of mica powder, 1.5 parts of aluminum powder, 8 parts of glass fiber and 10 parts of silver ion antibacterial agent at 160° C. to obtain the upper surface layer raw material;

[0131] S2, 70 parts of PBAT, 35 parts of PE, and 5 parts of iminodiacetonitrile were mixed uniformly at 160° C. to obtain a first buffer layer raw material;

[0132] S3, 40 parts of PBAT and 2 parts of methylaminosilane-modified glass fiber were mixed uniformly at 130° C. to obtain a middle layer raw material;

[0133] S4, 80 parts of PBAT, 20 parts of PE, and 5 parts of adiponitrile were mixed uniformly at 160° C. to obtain a second buffer layer raw material;

[0134] S5, 60 parts of PE and 4.5 parts of silver ion antibacterial agent were mixed uniformly at 160° C. to obtain a lower surface layer raw material;

[0135] S6. Co-extrude the upper surface layer raw material, the first buffer layer raw material, the middle layer raw material, the second buffer layer raw material and the lower surface layer raw material, and blow mold to obtain an agricultural film with a thickness ratio of upper surface layer: first buffer layer: middle layer: second buffer layer: lower surface layer of 0.5:1:1:1:0.5.

[0136] Comparative Example 1

[0137] S1. Mix 70 parts of PE, 1 part of mica powder, 0.5 parts of aluminum powder, 8 parts of glass fiber, and 10 parts of silver ion antibacterial agent at 160° C. to obtain the upper surface layer raw material;

[0138] S2, 70 parts of PBAT and 35 parts of PE were mixed evenly at 160° C. to obtain a first buffer layer raw material;

[0139] S3, 40 parts of PBAT and 2 parts of glass fiber were mixed evenly at 130° C. to obtain a middle layer raw material;

[0140] S4, 80 parts of PBAT and 20 parts of PE were mixed evenly at 160° C. to obtain a second buffer layer raw material;

[0141] S5, 60 parts of PE and 4.5 parts of silver ion antibacterial agent were mixed uniformly at 160° C. to obtain a lower surface layer raw material;

[0142] S6. Co-extrude the upper surface layer raw material, the first buffer layer raw material, the middle layer raw material, the second buffer layer raw material and the lower surface layer raw material, and blow mold to obtain an agricultural film with a thickness ratio of upper surface layer: first buffer layer: middle layer: second buffer layer: lower surface layer of 0.5:1:1:1:0.5.

[0143] The agricultural films with a thickness of 0.08 mm obtained in Examples 1 to 14 and Comparative Example 1 were tested for longitudinal and transverse tensile strength according to the method in GB / T 4455-2019, and the test results are recorded in Table 1.

[0144] Table 1 Longitudinal and transverse tensile strength of agricultural films

[0145]

[0146] It can be seen from Table 1 that the longitudinal tensile strength and transverse tensile strength of the agricultural films provided in Examples 1 to 14 of the present invention are both above 18 MPa, which meets the standard of GB / T 4455-2019.

[0147] Compared with Comparative Example 1, compounds containing imino groups and nitrile groups and dinitrile compounds are added in Examples 1 to 14, and the longitudinal tensile strength and transverse tensile strength of the agricultural films obtained in Examples 1 to 14 are higher than those in Comparative Example 1, indicating that the addition of compounds containing imino groups and nitrile groups and dinitrile compounds can improve the strength of the agricultural films.

[0148] The longitudinal tensile strength and transverse tensile strength of the agricultural films obtained in Examples 5 to 7 are higher than those in Examples 4 and 8, indicating that the mass ratio of mica powder and aluminum powder to glass fiber is 2.5 to 4.5:8, which can further improve the strength of the agricultural film.

[0149] The longitudinal tensile strength and transverse tensile strength of the agricultural film obtained in Examples 9 to 10 are higher than those in Examples 6 and 11, indicating that the mass ratio of mica powder, aluminum powder and glass fiber to the mass ratio of the compound containing imino groups and nitrile groups is 11.5:3 to 5, which can further improve the strength of the agricultural film.

[0150] The longitudinal tensile strength and transverse tensile strength of the agricultural film obtained in Example 12 are higher than those in Example 10, indicating that the glass fiber in the middle layer is methylaminosilane-modified glass fiber, which can further improve the strength of the agricultural film.

[0151] The longitudinal tensile strength and transverse tensile strength of the agricultural film obtained in Example 13 are higher than those in the other examples, indicating that the mass ratio of methylaminosilane-modified glass fiber to dinitrile compound is 2:3, which can further improve the strength of the agricultural film.

[0152] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A dustproof and antibacterial agricultural film, characterized in that: From top to bottom, it includes an upper surface layer, a first buffer layer, an intermediate layer, a second buffer layer and a lower surface layer; The raw materials of the upper surface layer include the following components in parts by mass: 60-80 parts of PE, 1-3 parts of mica powder, 0.5-2.5 parts of aluminum powder, 5-10 parts of glass fiber, and 9-12 parts of silver ion antibacterial agent; The raw materials of the first buffer layer include the following components in parts by weight: 60-80 parts of PBAT, 25-45 parts of PE, and 1-7 parts of a compound containing an imino group and a nitrile group; The raw materials of the intermediate layer include the following components in parts by weight: 30-50 parts of PBAT and 0.5-4 parts of glass fiber; The raw materials of the second buffer layer include the following components in parts by weight: 70-90 parts of PBAT, 15-25 parts of PE, and 1-5 parts of dinitrile compound; The raw materials of the lower surface layer include the following components in parts by mass: 50-70 parts of PE and 3-6 parts of silver ion antibacterial agent.

2. The dustproof and antibacterial agricultural film according to claim 1, characterized in that: The mass ratio of the mica powder and aluminum powder in the upper surface layer to the glass fiber is 2.5-4.5:

8.

3. The dustproof and antibacterial agricultural film according to claim 2, characterized in that: The mass ratio of the mica powder and aluminum powder in the upper surface layer to the glass fiber is 3.5:

8.

4. The dustproof and antibacterial agricultural film according to claim 1, characterized in that: The mass ratio of the mica powder, aluminum powder and glass fiber in the upper surface layer to the compound containing imino groups and nitrile groups is 11.5:3-5.

5. The dustproof and antibacterial agricultural film according to claim 1, characterized in that: The glass fiber in the middle layer is methylaminosilane modified glass fiber.

6. The dustproof and antibacterial agricultural film according to claim 5, characterized in that: The raw materials of the methylaminosilane-modified glass fiber include methylaminosilane and glass fiber in a mass ratio of 0.1 to 0.5:

1.

7. The dustproof and antibacterial agricultural film according to claim 6, characterized in that: The methylaminosilane is KH550.

8. The dustproof and antibacterial agricultural film according to claim 1, characterized in that: The dinitrile compound includes one or more of adiponitrile, succinonitrile, pimelonitrile, suberonitrile and sebaconitrile.

9. The dustproof and antibacterial agricultural film according to claim 8, characterized in that: The mass ratio of the glass fiber to the dinitrile compound in the intermediate layer is 2:

3.

10. The method for preparing a dustproof and antibacterial agricultural film according to any one of claims 1 to 9, characterized in that: The following steps are involved: The raw materials of the upper surface layer, the first buffer layer, the middle layer, the second buffer layer and the lower surface layer are melted and mixed uniformly, and then co-extruded and blow-molded to obtain a dustproof and antibacterial agricultural film.

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