Preparation method of high-sealing film for paper-plastic composite bag

Abstract

The invention discloses a preparation method of a high-sealing film for a paper-plastic composite bag. The preparation method comprises the following steps: uniformly mixing polytetrafluoroethylene with polyethylene terephthalate, performing irradiating treatment, carrying out air exhausting and air removal, adding talcum powder and a silane coupling agent, grinding all above substances, adding epoxy tall oil, and performing stirring to obtain a first material; stirring poly-beta-hydroxybutyric acid, polylactic acid, microcrystalline cellulose and the first material to obtain a second material; heating the second material, adding polydimethylsiloxane, methylphenyldiethoxysilane, zinc stearate, oxidized polyethylene wax, triallyl isocyanurate and a heat stabilizer, and continuously performing stirring to obtain a third material; and heating the third material, adding a photoinitiator, sepiolite powder, aluminum borate whiskers and nano-silica, continuously performing stirring, cooling the obtained mixture to room temperature in a stirring state, and performing blow molding to obtain the high-sealing film for the paper-plastic composite bag. The preparation method is simple, and theobtained film has the advantages of uniform stress, high elongation at break, excellent sealing effect and complete degradation under natural conditions.

Description

technical field [0001] The invention relates to the technical field of packaging materials, in particular to a method for preparing a high-sealing film for a paper-plastic composite bag. Background technique [0002] At present, disposable plastic shopping bags and paper-plastic composite bags are widely used. Although they bring convenience to people's lives, they also cause serious white pollution to the environment. The plastic materials often need to pass through the soil for decades or even on the ground. It takes a hundred years to degrade, and after burning, it can produce carcinogens such as dioxin, which will cause great damage to people's health and living environment. [0003] Although the starch-based degradable plastic packaging bags and kraft paper packaging bags that have emerged in recent years have solved the problem of white pollution caused by plastic bags, these packaging materials have poor sealing effects, and the elongation at break cannot meet the dem...

AI Technical Summary

Problems solved by technology

[0002] At present, disposable plastic shopping bags and paper-plastic composite bags are widely used. Although they bring convenience to people's lives, they also cause serious white pollution to the environment. The plastic materials often need to pass through the soil for decades or even on the ground. It takes a hundred years to degrade, and after burning, it can produce carcinogens such as dioxin, which will cause great damage to people's health and living environment

[0003] Although the starch-based degradable plastic packaging bags and kraft paper packaging bags that have emerged in recent years have solved the problem of white pollution caused by plastic bags, these packaging materials have poor sealing effects, and the elongation at break cannot meet the demand, and the product quality cannot meet the requirements. Therefore, it cannot be widely used