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Environment friendly biological preservative film and preparation method thereof
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A bio-preservation and environmental-friendly technology, applied in bio-packaging, food preservation, food science, etc., can solve the problems of weak marketization and high cost, and achieve good antibacterial and fresh-keeping performance
Active Publication Date: 2012-12-19
TIANJIN SHENGTIANLI MATERIAL TECH
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Although the existing polylactic acid packaging film has good mechanical properties, its cost is high and its marketability is not strong.
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[0034] Firstly, the straw fiber, glycerin and polydiphenylmethane diisocyanate were fully mixed and homogenized at room temperature for 1 hour, and left for 24 hours to prepare a mixed fiber component; then 2 parts by mass of polylactic acid, dichloromethane, lactic acid Streptin and natamycin were mixed evenly and stirred for 50 minutes to prepare an antibacterial preservative; 98 parts by mass of polylactic acid particles were mixed with 50 parts by mass of mixed fiber components, and the diameter of the screw rod was 18mm, and the length-to-diameter ratio of the screw rod ...
[0054] Its specific manufacturing steps are the same as those of the first embodiment, and will not be repeated here.
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Abstract
The invention discloses an environment friendly biological preservative film. The environment friendly biological preservative film comprises polylactic acid, strawfiber, glycerol, polydiphenylmethane diisocyanate, lactic streptococci peptide, dichloromethane and natamycin. The preparation method comprises the steps of: preparing a synthetic fabric component by using strawfiber, oat fiber, glycerol, distilled water and polydiphenylmethane diisocyanate; preparing an antibacterial preservative by polylactic acid, dichloromethane, lactic streptococci peptide and natamycin; then mixing the synthetic fabric component with particles of polylactic acid, carrying out melt extrusion, blow molding and cooling to prepare a biological film; and uniformly coating the antibacterial preservative. With the adoption of the biological preservative film provided by the invention, high strength of the thin film can be maintained while the production cost of the polylactic acid thin film is greatly reduced, so that the tensile strength, the elongation at break, the frictional coefficient and the light transmittance of the environment friendly biological preservative film meet the national state, and the environment friendly biological preservative film further has good antibacterial preservative performance of food package.
Description
technical field [0001] The invention relates to a food packaging fresh-keeping film and a preparation method thereof, in particular to an antibacterial and environment-friendly biological fresh-keeping film prepared by adding fully degraded polylactic acid to agricultural product waste fibers and a preparation method thereof. Background technique [0002] In the process of food storage and transportation, it is often necessary to use packaging film. Although the existing polylactic acid packaging film has better mechanical properties, the cost is very high and the marketability is not strong. Waste fibers from agricultural products, such as oat fiber and straw fiber, are cheap and widely sourced. After plasticization, they can be melted and co-extruded with polylactic acid to make completely degradable biofilms. After adding antibacterial factors therein, the biofilm can also have fresh-keeping and antibacterial properties. Contents of the invention [0003] The technica...
Claims
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