Polyethylene composite film and preparation method thereof

Abstract

The invention belongs to the technical field of high polymer materials, and particularly relates to a polyethylene composite film and a preparation method thereof. The invention provides a polyethylene composite film. The polyethylene composite film comprises an outer layer, a middle layer and an inner layer which are sequentially bonded, the preparation raw materials of the outer layer comprise first low-density polyethylene and high-density polyethylene; the middle layer is prepared from the following raw materials: second low-density polyethylene, an annular block high polymer material, a plant antibacterial master batch and linear low-density polyethylene; the inner layer is prepared from the following raw materials: first low-density polyethylene, metallocene low-density polyethylene and plant antibacterial master batch. The polyethylene composite film provided by the invention has relatively good linear easy-to-tear property and antibacterial property.

Description

technical field

[0001] The invention belongs to the technical field of polymer materials, and in particular relates to a polyethylene composite film and a preparation method thereof. Background technique

[0002] A large number of harmful microorganisms in the living environment are always threatening people's health, and the antibacterial requirements for food, medicine, medical equipment, daily use and care products are also getting higher and higher. While consumers have high requirements for the antibacterial properties of packaging bags, they also hope that packaging bags can be easily torn. Polyethylene (PE) film has good acid and alkali resistance, drug resistance, low sealing temperature, high heat sealing strength, good toughness, good puncture resistance, good freezing resistance and safety and sanitation, which can directly contact food and medicine. Advantages, it has been widely used in packaging materials for food, medicine, daily chemicals, nursing care and e...

Examples

preparation example Construction

[0023] The raw materials for the preparation of the outer layer include the first low-density polyethylene and high-density polyethylene;

[0024] The raw materials for the preparation of the middle layer include second low-density polyethylene, cyclic block polymer material, plant antibacterial masterbatch and linear low-density polyethylene;

[0025] The raw materials for preparing the inner layer include the first low-density polyethylene, metallocene low-density polyethylene and plant antibacterial masterbatch.

[0026] In the present invention, unless otherwise specified, the raw materials used in the present invention are preferably commercially available products.

[0027] In terms of the mass percentage of the outer layer, the raw material for the preparation of the outer layer in the present invention preferably includes 50-90% by mass of the first low-density polyethylene, more preferably 60-85%. In the present invention, the melt index of the first low-density poly...

Embodiment 1

[0070] In the polyethylene composite film prepared in this example, the mass ratio of the outer layer, middle layer and inner layer is 30:40:30;

[0071] In terms of mass percentage, the preparation raw materials of the outer layer are:

[0072] Low Density Polyethylene LB7500N 82%

[0073] Density Polyethylene C828A 18%

[0074] In terms of mass percentage, the preparation raw materials of the middle layer are:

[0075]

[0076] In terms of mass percentage, the preparation raw materials of the inner layer are:

[0077] Low Density Polyethylene LB7500N 75.5%

[0078] Metallocene Low Density Polyethylene 3518PA 20%

[0079] Plant antibacterial masterbatch BCA-502MBN 4.5%

[0080] The preparation method is:

[0081] The raw materials of the outer layer, the middle layer and the inner layer are respectively dosed in proportion by the automatic batching system, and then sent to the feed ports of the outer layer, middle layer and inner layer of the extruder respectively, a...

Embodiment 2

[0086] The difference between this embodiment and Embodiment 1 is that the mass ratio of the outer layer, middle layer and inner layer is 25:45:30, and other operations and parameters remain unchanged.

technical field

[0001] The invention belongs to the technical field of polymer materials, and in particular relates to a polyethylene composite film and a preparation method thereof. Background technique

[0002] A large number of harmful microorganisms in the living environment are always threatening people's health, and the antibacterial requirements for food, medicine, medical equipment, daily use and care products are also getting higher and higher. While consumers have high requirements for the antibacterial properties of packaging bags, they also hope that packaging bags can be easily torn. Polyethylene (PE) film has good acid and alkali resistance, drug resistance, low sealing temperature, high heat sealing strength, good toughness, good puncture resistance, good freezing resistance and safety and sanitation, which can directly contact food and medicine. Advantages, it has been widely used in packaging materials for food, medicine, daily chemicals, nursing care and e...

Examples

preparation example Construction

[0023] The raw materials for the preparation of the outer layer include the first low-density polyethylene and high-density polyethylene;

[0024] The raw materials for the preparation of the middle layer include second low-density polyethylene, cyclic block polymer material, plant antibacterial masterbatch and linear low-density polyethylene;

[0025] The raw materials for preparing the inner layer include the first low-density polyethylene, metallocene low-density polyethylene and plant antibacterial masterbatch.

[0026] In the present invention, unless otherwise specified, the raw materials used in the present invention are preferably commercially available products.

[0027] In terms of the mass percentage of the outer layer, the raw material for the preparation of the outer layer in the present invention preferably includes 50-90% by mass of the first low-density polyethylene, more preferably 60-85%. In the present invention, the melt index of the first low-density poly...

Embodiment 1

[0070] In the polyethylene composite film prepared in this example, the mass ratio of the outer layer, middle layer and inner layer is 30:40:30;

[0071] In terms of mass percentage, the preparation raw materials of the outer layer are:

[0072] Low Density Polyethylene LB7500N 82%

[0073] Density Polyethylene C828A 18%

[0074] In terms of mass percentage, the preparation raw materials of the middle layer are:

[0075]

[0076] In terms of mass percentage, the preparation raw materials of the inner layer are:

[0077] Low Density Polyethylene LB7500N 75.5%

[0078] Metallocene Low Density Polyethylene 3518PA 20%

[0079] Plant antibacterial masterbatch BCA-502MBN 4.5%

[0080] The preparation method is:

[0081] The raw materials of the outer layer, the middle layer and the inner layer are respectively dosed in proportion by the automatic batching system, and then sent to the feed ports of the outer layer, middle layer and inner layer of the extruder respectively, a...

Embodiment 2

[0086] The difference between this embodiment and Embodiment 1 is that the mass ratio of the outer layer, middle layer and inner layer is 25:45:30, and other operations and parameters remain unchanged.

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