Biodegradable packaging film material

Abstract

The invention discloses a biodegradable packaging film material. The biodegradable packaging film material is prepared by adding grafted and coated SiO2 serving as a compatible modifier into a mixed system of polylactic acid resin (PLA) and poly (butylene adipate / terephthalate) resin (PBAT). According to the formula of the biodegradable packaging film material provided by the invention, PLA / PBAT resin terminal carboxyl groups and epoxy groups in grafted coated SiO2 molecules are subjected to ring-opening reaction under a high-temperature condition, and a compatible modifier is connected to a PLA / PBAT macromolecular chain in a chemical bond form, so that the phase separation problem of PLA and PBAT can be effectively improved, slippage of two-phase separation molecular chains in a stress direction is effectively avoided, and the service life of the packaging film material is prolonged. The tensile strength and the impact strength of a PLA and PBAT blend are permanently improved, the material is endowed with lasting flexibility, and the service life and the safety performance of a biodegradable packaging film product are improved.

Description

technical field

[0001] The invention relates to the field of preparation of biodegradable materials, in particular to a biodegradable packaging film material and a biodegradable packaging film prepared therefrom. Background technique

[0002] "White pollution" refers to the pollution of the discarded non-degradable plastic film to the environment, such as damage to the soil structure, reduction of the ability of plants to absorb nutrients, and reduction of soil fertility. In the face of the increasingly serious white pollution problem, people hope to find a plastic substitute that can replace the current plastic performance without causing white pollution, and degradable plastics have emerged as the times require. After the service life is discarded, under specific environmental conditions, due to obvious changes in its chemical structure, it will degrade due to some performance losses and changes in appearance, which is harmless or less harmful to the natural environment. ...

Examples

Embodiment 1

[0028] In this example, the graft-coated SiO is prepared according to the following steps 2 , as the compatibility modifier used in subsequent examples:

[0029] First, 10kg of SiO with a particle size of 50nm 2 (The TEM image of the figure 1 shown) poured into the reactor, then added 100kg water, 0.05kg SDS, 0.03kg PVA, stirred at 90 ° C for 1h to dissolve SDS and PVA; then added 3kg butyl acrylate, 2.5kg methacrylic acid to the reactor Glycidyl ester and 0.02kg BPO were added to the reaction kettle, mixed and stirred, and the reaction was stirred at 80 °C for 8 hours. The obtained product was filtered and dried to obtain graft-coated SiO 2 , and its TEM image is as figure 2 shown.

Embodiment 2

[0031] The composition of each raw material of the biodegradable packaging film material in this embodiment is: 6 parts of polylactic acid resin (FY804), 74 parts of polyadipate / butylene terephthalate resin (TH801T), calcium carbonate powder 20 parts, 0.1 part antioxidant 1010, 0.2 part antioxidant 168, lubricant oleic acid amide 1.5 part, lubricant calcium stearate 3 parts, UV absorber 2-hydroxy-4-n-octyloxydibenzyl 3 parts of ketone, 3 parts of graft-coated SiO 2 .

Embodiment 3

[0033] The composition of each raw material of the biodegradable packaging film material in this embodiment is: 6 parts of polylactic acid resin (FY804), 74 parts of polyadipate / butylene terephthalate resin (TH801T), calcium carbonate powder 20 parts, 0.1 part antioxidant 1010, 0.2 part antioxidant 168, lubricant oleic acid amide 1.5 part, lubricant calcium stearate 3 parts, UV absorber 2-hydroxy-4-n-octyloxydibenzyl 3 parts of ketone, 5 parts of graft-coated SiO 2 .

technical field

[0001] The invention relates to the field of preparation of biodegradable materials, in particular to a biodegradable packaging film material and a biodegradable packaging film prepared therefrom. Background technique

[0002] "White pollution" refers to the pollution of the discarded non-degradable plastic film to the environment, such as damage to the soil structure, reduction of the ability of plants to absorb nutrients, and reduction of soil fertility. In the face of the increasingly serious white pollution problem, people hope to find a plastic substitute that can replace the current plastic performance without causing white pollution, and degradable plastics have emerged as the times require. After the service life is discarded, under specific environmental conditions, due to obvious changes in its chemical structure, it will degrade due to some performance losses and changes in appearance, which is harmless or less harmful to the natural environment. ...

Examples

Embodiment 1

[0028] In this example, the graft-coated SiO is prepared according to the following steps 2 , as the compatibility modifier used in subsequent examples:

[0029] First, 10kg of SiO with a particle size of 50nm 2 (The TEM image of the figure 1 shown) poured into the reactor, then added 100kg water, 0.05kg SDS, 0.03kg PVA, stirred at 90 ° C for 1h to dissolve SDS and PVA; then added 3kg butyl acrylate, 2.5kg methacrylic acid to the reactor Glycidyl ester and 0.02kg BPO were added to the reaction kettle, mixed and stirred, and the reaction was stirred at 80 °C for 8 hours. The obtained product was filtered and dried to obtain graft-coated SiO 2 , and its TEM image is as figure 2 shown.

Embodiment 2

[0031] The composition of each raw material of the biodegradable packaging film material in this embodiment is: 6 parts of polylactic acid resin (FY804), 74 parts of polyadipate / butylene terephthalate resin (TH801T), calcium carbonate powder 20 parts, 0.1 part antioxidant 1010, 0.2 part antioxidant 168, lubricant oleic acid amide 1.5 part, lubricant calcium stearate 3 parts, UV absorber 2-hydroxy-4-n-octyloxydibenzyl 3 parts of ketone, 3 parts of graft-coated SiO 2 .

Embodiment 3

[0033] The composition of each raw material of the biodegradable packaging film material in this embodiment is: 6 parts of polylactic acid resin (FY804), 74 parts of polyadipate / butylene terephthalate resin (TH801T), calcium carbonate powder 20 parts, 0.1 part antioxidant 1010, 0.2 part antioxidant 168, lubricant oleic acid amide 1.5 part, lubricant calcium stearate 3 parts, UV absorber 2-hydroxy-4-n-octyloxydibenzyl 3 parts of ketone, 5 parts of graft-coated SiO 2 .

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