Polylactic acid-terahertz degradable sterilizing and deodorizing preservative film and preparation method thereof

• Main Authors: NIE YUNFENG, LI JIANGKUO, ZHANG PENG, LIU QUANXUE, LIU HENGZHUO
• Format: Patent
• Language: Chinese; English
• Published: 06.11.2020
• Subjects: ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS,e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES,DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; CONVEYING; GENERAL PROCESSES OF COMPOUNDING; HANDLING THIN OR FILAMENTARY MATERIAL; MAKING GRANULES OR PREFORMS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PACKAGES; PACKAGING ELEMENTS; PACKING; PERFORMING OPERATIONS; PREPARATION OR PRETREATMENT OF THE MATERIAL TO BESHAPED; PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCESIN A PLASTIC STATE; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIALCONTAINING PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; STORING; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL; WORKING-UP

The invention discloses a polylactic acid-terahertz degradable sterilizing and deodorizing preservative film and a preparation method thereof. The preservative film comprises the following raw materials in parts by weight: 36-40 parts of PLA, 40-45 parts of PBAT, 3-5 parts of CaCO3, 2-3 parts of jujube pit wood carbon powder and 5-10 parts of terahertz powder. The preparation method comprises thefollowing steps of: adding PLA, CaCO3, jujube pit wood carbon powder and PBAT into a high-speed mixer to uniformly mix the raw materials; then adding the mixture and terahertz powder into a screw extruder together for extrusion, bracing, cooling and dicing to obtain the special resin for the polylactic acid-terahertz degradable sterilizing and deodorizing preservative film; adding the special resin into a film blowing unit for extrusion and inflation; and performing or omitting secondary inflation, performing cooling, traction, terahertz enhanced irradiation and rolling so as to obtain the preservative film. The terah