High-low-temperature anti-fog gas-permeable polyolefin heat-sealing film for fruit and vegetable packaging, and preparation method thereof

Abstract

The invention discloses a high-and-low-temperature anti-fog gas-permeable polyolefin heat-sealing film for fruit and vegetable packaging. The high-and-low-temperature anti-fog gas-permeable polyolefinheat-sealing film comprises a corona layer, a core layer and a heat-sealing layer from top to bottom, wherein a layer ratio structure of three-layer co-extrusion is as follows: the layer ratio structure corona layer / core layer / heat-sealing layer of three-layer co-extrusion is HOPP / (HOPP and high-and-low temperature antifogging agent) / (mPE and LLDPE and PBS and high-and-low temperature antifoggingagent and superfine diatomite). According to the invention, a certain proportion of a high-and-low-temperature compound antifogging agent is added into a heat-sealing layer and a core layer, so thatthe film has high temperature and low temperature antifogging performance at the same time; superfine diatomite is added into the heat-sealing layer, so that the precipitation of the antifogging agentis delayed and the antifogging time of the film is prolonged by using the adsorption function of the superfine diatomite, and the granularity of diatomite can increase the gas permeability and the opening property of the film and increase the strength of the film so as to solve the problem of film strength reducing caused by addition of the antifogging agent and prepare the polyolefin heat-seal film being transparent, high in heat-seal strength and good in antifogging effect.

Description

technical field [0001] The invention belongs to the technical field of anti-fog films, and in particular relates to a high-low temperature anti-fog and breathable polyolefin heat-sealing film for fruit and vegetable packaging and a preparation method thereof. Background technique [0002] Anti-fog film is widely used in food, fruit and vegetable packaging and other fields. The commonly used anti-fog film is polyolefin film. The anti-fog plastic film has the following important performance requirements: (1) It has good initial anti-fog performance and anti-fog durability (2) The addition of anti-fog agent should not have a great impact on the heat-sealing performance of the film, The heat seal strength of the film cannot be reduced (3) The film has good tensile strength and transparency (4) It has a certain degree of air permeability, which can maintain the respiration of fruits and vegetables. [0003] At present, most of the anti-fog films for fruits and vegetables on the...

AI Technical Summary

Problems solved by technology

In the present invention, by adding a certain proportion of high and low temperature compound antifogging agent in the heat sealing layer and the core layer, the film has high and low temperature antifogging performance at the same time; adding a certain amount of ultrafine diatomite in the heat sealing layer can use The adsorption function of diatomite can delay the precipitation of anti-fogging agent, prolong the anti-fog time of the film, and use the granularity of diatomite to increase the air permeability and opening of the film. On the other hand, the inorganic material diatomite can Increase the strength of the film, and solve the problem of film strength reduction caused by the addition of anti-fogging agents; add a certain proportion of PBE elastomers to the heat-sealing layer, PBE elastomers have a viscosity-increasing effect, and solve the problems caused by the increase of anti-fogging agents. The heat-sealing strength of the film is reduced. At the same time, it has the same functional group as mPE and HOPP, which can be used as a connecting agent to connect the heat-sealing layer mPE and the core layer HOPP to ensure that the heat-sealing layer and the core layer composed of different materials are firmly connected without delamination; A polyolefin heat-sealing film with transparency, high heat-sealing strength, and good anti-fog effect is prepared by using high-elastic biaxial stretching molding technology combined with microcrystalline nucleation

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