High-performance and high-barrier-property food packaging film and preparation method thereof

Abstract

The invention discloses a high-performance and high-barrier-property food packaging film. The high-performance and high-barrier-property food packaging film is prepared from the following raw materials in parts by weight: 38 to 44 parts of modified polymethylethylene carbonate, 22 to 24 parts of nano silicon dioxide, 12 to 16 parts of ethylene-vinyl acetate copolymer, 3 to 5 parts of emulsifier, 2to 4 parts of processing auxiliary agent and 14 to 20 parts of water. According to the high-performance and high-barrier-property food packaging film disclosed by the invention, rosin is a renewableforest resource and resin acid in the rosin contains a large phenanthrene ring structure so that the tensile strength of the material can be improved. Although polymethylethylene carbonate has excellent air blocking and water blocking functions and is degradable, the polymethylethylene carbonate modified through the rosin enables a matrix material to have a high barrier property and also have a mechanical property.

Description

technical field [0001] The invention relates to the technical field of high-barrier packaging, in particular to a high-performance high-barrier food packaging film and a preparation method thereof. Background technique [0002] The packaging film is mainly composed of several different grades of resin mixed and extruded. It is puncture-resistant, super-strength and high-performance. It wraps the goods stacked on the pallet to make the package more stable and tidy, and has a super waterproof effect. It is widely used in foreign trade export, papermaking, hardware, plastic chemical industry, building materials, food and pharmaceutical industries. With a series of environmental protection documents issued by environmental protection organizations, the concept of low-carbon environmental protection has become increasingly popular, and many fields have begun to practice low-carbon Environmental protection is the same in the field of packaging. Green packaging materials have becom...

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Problems solved by technology

[0003] In the prior art, the degradability and barrier properties of food packaging film materials cannot achieve a good synergistic effect. At the same time, the barrier properties have been improved, but the tensile strength of the film has not been improved, which limits the technical development of packaging films. The Chinese patent document "( Application number: 201410410911.1)" discloses a preparation method of a biodegradable high-barrier plastic film material, including the following steps: S1. Dispersing an organically modified layered silicate and a water-soluble polymer in an aqueous solution to obtain an impregnation solution S2. apply the impregnation solution of S1 on the base polymer film, dry, and make the impregnation solution form a coating layer to obtain the biodegradable high-barrier plastic film material. Polymethylethylene carbonate is used as the base material in this document , although polymethylethylene carbonate has excellent gas and water barrier and is degradable, its mechanical properties are poor, its tensile strength is low, and its barrier properties and tensile strength cannot be coordinated; Chinese patent literature "(application number: 201510049743.2 )” discloses a high-barrier degradable plastic, which is a high-barrier degradable plastic formed by transesterification and chain extension of microcrystalline starch and carboxyl-terminated butylene succinate prepolymer, and its raw material formula is by weight Parts include the following components: 50-65 parts of microcrystalline starch, 20-25 parts of carboxy-terminated butylene succinate prepolymer, 3-5 parts of barrier agent, 2-3 parts of heat-resistant additive, chain extender 0.5-1 part of agent, 0.02-0.05 part of catalyst, 0.3-1.0 part of processing aid; the microcrystalline starch used in this document is used as the main base material, and the microcrystalline starch is combined through the starch chains. , resulting in incomplete crystal lattice, many defects, difficult to control the preparation, inconvenient operation, easy to make the performance of the prepared plastic not very stable, which limits the development of packaging film technology

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