High-mechanical-strength functional starch composite film as well as preparation method and application thereof

By adding antioxidant substances and mechanical strength enhancement substances to the starch film, and subjecting alternating electric field treatment and ultraviolet irradiation, the problem of insufficient mechanical strength and barrier properties of the starch film is solved, and functions with high mechanical properties and good degradability are prepared. Starch composite film, suitable for food packaging.

CN119176970APending Publication Date: 2024-12-24NANJING GRAIN GRP LTD CO +1
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Patent Information

Application Number
CN202411573357.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-11-06
Publication Date
2024-12-24

AI Technical Summary

Technical Problem

The existing starch films have low mechanical strength and poor barrier properties in the packaging field, making it difficult to replace non-biodegradable plastic packaging materials.

Method used

By mixing gelatinized starch, plasticizer, antioxidant substance and mechanical strength enhancement substance, and undergoing alternating electric field treatment and ultraviolet irradiation, a high mechanical strength functional starch composite film is prepared, and hydrophobic substances and ultraviolet initiators are added to Improve the hydrophobic properties and antioxidant properties of the membrane.

Benefits of technology

When the film thickness is 13mm, the tensile strength reaches 32~40Mpa, the elongation rate of break is 30~50%, the water vapor transmittance is low, the antioxidant activity is high, and the water absorption rate does not exceed 45%. The water solubility does not exceed 36%, and the degradation rate within 30 days is not less than 78%, which significantly improves the mechanical properties and biodegradability of the starch film.

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Abstract

The invention discloses a high-mechanical-strength functional starch composite film as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing gelatinized starch, a plasticizer, an antioxidant substance and a mechanical strength enhancing substance to obtain a film forming solution; carrying out alternating electric field treatment on the film forming liquid, and then balancing moisture to prepare a compound film; and applying a photosensitizer containing a hydrophobic substance and an ultraviolet initiator to the surface of the composite film, and then irradiating with ultraviolet rays to prepare the functional starch composite film with high mechanical strength. The starch composite film provided by the invention has excellent mechanical properties, good hydrophobicity, oxidation resistance and degradability, and can be widely applied to the field of food packaging of fresh-cut fruits and vegetables, meat products, easy-to-oxidize cereal products and the like.
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