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Physical aging-resistant polylactic acid blow molding product, preparation method and application thereof

A physical aging, polylactic acid technology, applied in the field of polylactic acid blow molding and polylactic acid products, can solve problems such as brittleness, and achieve the effect of maintaining stability, excellent physical aging resistance, and broad application prospects.

Active Publication Date: 2022-07-12
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Although the above known technologies can prepare polylactic acid plastic bottles, under current technical conditions, polylactic acid plastic bottles are not strictly designed and controlled from the molecular essence of resistance to physical aging and process steps, and are easy to be used in the warehouse logistics stage (shelf life) ) physical aging leads to rapid brittleness; therefore, it is necessary to develop new physical aging-resistant polylactic acid blow molding products and their preparation methods to meet the higher requirements of various applications for their comprehensive performance

Method used

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  • Physical aging-resistant polylactic acid blow molding product, preparation method and application thereof
  • Physical aging-resistant polylactic acid blow molding product, preparation method and application thereof

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preparation example Construction

[0043] In some more specific embodiments, the preparation method specifically includes:

[0044] (1) Provide dry polylactic acid or polylactic acid dry mixture;

[0045] (2) melt extruding the dried polylactic acid (or polylactic acid blend) through screw extrusion equipment, and the screw temperature is 150-270 °C;

[0046] (3) The polylactic acid melt is directly input into the split mold for blow molding (or, the melt is first stretched in the axial direction, the stretching temperature is 65-145° C., and the stretching ratio along the axial direction is 1-6 times). ; Then enter the split-molding blow molding), the blowing (in-mold) temperature is 65-145 °C, the blowing stretch ratio along the radial direction is 1-6 times, and then quenching at 2-800 °C / sec. The cooling rate is rapidly quenched to room temperature, and the quenching time is 0.1 to 59 seconds to obtain a polylactic acid blow molded product;

[0047] (4) Place the polylactic acid blow-molded product with a...

Embodiment 1

[0104] Take polylactic acid with a weight-average molecular weight of 150,000 and a molar content of L optical isomers of 95% for hot air drying, the drying temperature is 95 ± 2 ° C, the drying time is 8 hours, and the water content is 50 ppm; The material is extruded through screw extrusion equipment to obtain polylactic acid melt, and the screw temperature is 190 °C; the polylactic acid melt is directly input into the split mold for blow molding, the blowing temperature is 95 °C, and the blowing stretch ratio is 3 times; Enter the rapid cooling device to obtain a blow-molded product with a closed or open cavity structure, the quenching rate is 15°C / sec, and the quenching time is 5 seconds; further, the polylactic acid blow-molded product is placed in a pressure tank for pressurization and constant temperature. Treatment, the pressure in the pressure tank is 1.2 standard atmospheres, and the temperature is 78°C; then the temperature is lowered to room temperature at a cooling...

Embodiment 2

[0106] Take polylactic acid with a weight-average molecular weight of 300,000 and a molar content of L optical isomers of 95% and dry it with hot air. The drying temperature is 95±2° C., the drying time is 8 hours, and the water content is 45 ppm; The material is extruded through a screw extrusion equipment to obtain a polylactic acid melt, and the screw temperature is 230 °C; the polylactic acid melt is directly input into the split mold for blow molding, the blowing temperature is 115 °C, and the blowing stretch ratio is 2 times; Enter the rapid cooling device to obtain a blow-molded product with a closed or open cavity structure, the quenching rate is 3°C / second, and the quenching time is 30 seconds; further, the polylactic acid blow-molded product is placed in a pressure tank for pressurization and constant temperature. Treatment, the pressure in the pressure tank is 1.1 standard atmospheres, and the temperature is 87 °C; after that, the temperature is lowered to room tempe...

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Abstract

The invention discloses a polylactic acid blow-molded product with resistance to physical aging, a preparation method and application thereof. The polylactic acid blow-molded product has a closed or open cell structure, and it contains 0wt%-85wt% of a crystalline phase and 15wt%-100wt% of an amorphous phase; the amorphous phase contains 5wt%-75wt% of a metastable phase, The characteristic peak of the metastable phase in the infrared spectrum appears at 918cm ‑1 place. The polylactic acid blow-molded product of the present invention has the characteristics of resistance to physical aging, and the yield strength and elongation at break change rate before and after storage are small. Bottles, medical hanging bottles and other products not only have the strength superior to the existing polylactic acid blow molding products, but also have excellent physical aging resistance, which can maintain the stability of size and performance in the storage and logistics stage, and the preparation process is beneficial to mass production.

Description

technical field [0001] The invention relates to a polylactic acid product, in particular to a polylactic acid blow-molded product resistant to physical aging, a preparation method and application thereof (drinking water bucket, milk bucket, beverage bottle, milk bottle, cosmetic packaging bottle, medical hanging bottle, etc.) , belonging to the field of blow molding technology. Background technique [0002] With the vigorous development of the global oil industry, a large number of petroleum-based polymers are made into barrels, bottles and other containers every year, which are used in industrial, medical and daily life fields. Among them, beverage bottles greatly facilitate people's diet and life because of the convenience of "disposal after use"; medical hanging bottles improve the safety of the medical and health field because of their one-time setting. However, the uncertainty of health and safety caused by the precipitation of petroleum-based resin itself and related ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C49/04B29C49/06C08L67/04
CPCB29C49/04B29C49/06C08L67/04Y02W90/10B29C2049/023
Inventor 黄威陈鹏
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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