• 专利标题:   Straw material of high mechanical strength and toughness, used in hot beverage industry, comprises preset amounts of polylactic acid, auxiliary material containing nucleating agent, composite toughening agent and slipping agent, composite heat stabilizer, antibacterial agent and anti-aging agent.
  • 专利号:   CN114921075-A
  • 发明人:   HE X
  • 专利权人:   SANMEN ZHENHE TECHNOLOGY CO LTD
  • 国际专利分类:   B29D023/00, C08J007/00, C08L067/04, C08L069/00
  • 专利详细信息:   CN114921075-A 19 Aug 2022 C08L-067/04 202290 Chinese
  • 申请详细信息:   CN114921075-A CN10643625 02 Jun 2022
  • 优先权号:   CN10643625

▎ 摘  要

NOVELTY - A heat-resistant, biodegradable straw material comprises 63-125 pts. wt. modified polylactic acid, 20.7-95 pts. wt. auxiliary materials, 0.05-15 pts. wt. composite heat stabilizer, 2.2-16.5 pts. wt. natural antibacterial agent and 1-16 pts. wt. anti-aging agent. USE - Heat-resistant biodegradable straw material is used in hot beverage industry. ADVANTAGE - The heat-resistant biodegradable straw material has excellent temperature resistance, degradability, mechanical strength, toughness and processing characteristics. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of heat-resistant, biodegradable straw material which involves: (1) drying the modified polylactic acid and the auxiliary materials at 60-100℃ for 8-24 hours; (2) weighing modified polylactic acid, auxiliary materials, composite heat stabilizer, natural antibacterial agent and anti-aging agent, followed by mixing the components at normal temperature for 2-6 minutes; (3) adding the uniformly mixed raw materials into a screw extruder of length-diameter ratio 75:1, melt blending, the operation temperature of each temperature zone of the extruder, is 160-210℃, the screw rotation speed is 200-600 hertz (Hz), followed by cooling, bracing and granulating to form modified resin; (4) performing vacuum drying on modified resin at 50-80℃ for 6-10 hours; (5) compressing the dried modified resin as a master batch, in an extruder with compression ratio (20-40):1, melt processing, then extruding out straw through a die head; (6) cooling the extruded straw at 10-60℃ for 10-40 seconds, stretching, orientating and presetting so that the molecules in the straw are oriented, arranged and shaped, the drawing rate is 1-5 m/second; (7) fixing the straw on a microwave heating device for annealing recrystallization, so that the original molecular chain segments are disoriented under microwave heating at 60-110℃ for 20-60 seconds, the inhomogeneous crystals are disintegrated and rearranged to form more compact alpha crystals, the mechanical strength and the temperature resistance of the straw are improved; (8) subjecting straw to secondary setting after crystallization, by rapid cooling at 10-40℃ for 10-40 seconds, and drawing at speed 2-6 m/seconds as in step 6; (9) cutting the straw into fixed lengths and then air-drying.