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Antibacterial casting PE-LD/PLA degradable composite film

A technology of PE-LD and composite film, which is applied in the direction of climate sustainability, sustainable packaging industry, sustainable manufacturing/processing, etc., can solve problems such as large structural differences, and achieve the effect of good mechanical properties and strong antibacterial properties

Pending Publication Date: 2021-03-23
ZHONGKAI UNIV OF AGRI & ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large difference in the structure of polyester and polyolefin, the compatibility of the two is a big problem for composite materials, and the use of compatibilizers must be considered in the blending process.

Method used

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  • Antibacterial casting PE-LD/PLA degradable composite film
  • Antibacterial casting PE-LD/PLA degradable composite film
  • Antibacterial casting PE-LD/PLA degradable composite film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Pre-mix 400.0g of PE-LD and 100.0g of PLA plastic particles, add 20.0g of PEG-6000 to it, measure 5.0g of nano-TiO 2 Put 0.1 mL of silane coupling agent in the beaker, stir well, add it to the PE-LD and PLA mixed system, stir again, pour it into the feeding barrel, turn on the melt pump and main engine of the twin-screw casting machine , Feeding machine, the speed of the main engine is set to 10.0rpm, the speed of the melt pump is set to 6.0rpm, the temperature of the barrel 1-8 area is set to 180°C-190°C, the screen changing area, the transition body 1-3 area, the melt The temperature in the pump area is set to 190°C-200°C, and the temperature in the 1-3 area of ​​the die head is set to 210°C. The linear speed of each roller of the tape casting and stretching auxiliary machine is set to 1m / min. When the melt pump starts to pull the film, the composite film product is obtained through the casting roll, the pulling roll, the cooling roll, and the winding roll.

[0022]...

Embodiment 2

[0024] Pre-mix 400.0g of PE-LD and 100.0g of PLA plastic particles, add 20.0g of PEG-5000 to it, and measure 10.0g of nano-TiO 2 Drop 0.2 mL of silane coupling agent into the beaker, stir evenly, add it to the PE-LD and PLA mixed system, then stir again, pour it into the feeding barrel, and turn on the melt pump of the twin-screw casting machine , main engine, feeder, the main engine speed is set to 20.0rpm, the melt pump speed is set to 10.0rpm, and the temperature parameters need to be set in advance, because the machine needs to be heated to the set temperature in advance, the machine can run normally, barrel 1-8 The temperature of the area is set at 180°C-190°C, the temperature of the screen changing area, the transition body 1-3 area, and the melt pump area is set at 190°C-200°C, and the temperature of the die head 1-3 area is set at 210°C. The linear speed of each roller of the tape casting and stretching auxiliary machine is set to 2m / min. When the melt pump starts to ...

Embodiment 3

[0027] Premix 400.0g of PE-LD and 100.0g of PLA plastic particles, add 20.0g of PEG-4000 to it, and measure 15.0g of nano-TiO 2 Drop 0.3 mL of silane coupling agent into the beaker, stir evenly, add it to the PE-LD and PLA mixed system, stir again, pour it into the feeding barrel, and turn on the melt pump of the twin-screw casting machine , main engine, feeder, the speed of the main engine is set to 20.0rpm, the speed of the melt pump is set to 12.0rpm, the temperature of the barrel 1-8 area is set to 180°C-190°C, the screen changing area, the transition body 1-3 area, The temperature in the melt pump area is set to 190°C-200°C, and the temperature in the 1-3 area of ​​the die head is set to 210°C. The linear speed of each roller of the tape casting and stretching auxiliary machine is set to 2m / min. When the melt pump starts to pull the film, the composite film product is obtained through the casting roll, the pulling roll, the cooling roll, and the winding roll.

[0028] T...

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Abstract

The invention discloses an antibacterial casting PE-LD / PLA degradable composite film which is prepared by the following steps: (1) putting PE-LD and PLA plastic master batches into an electrothermal blowing dryer to be dried for 8 hours at the temperature of 80 DEG C; (2) mixing the dried PE-LD and PLA plastic particles according to a mass ratio of 9:1 to 6:4, adding a compatibilizer, adding coupling agent modified nano TiO2, conducting uniform mixing, and feeding an obtained mixture into a feeding cylinder of a twin-screw tape casting extruder; and (3) when the melt is extruded from a head die, introducing the melt into a cooling roller, continuously pulling the melt to other pulling devices, and stretching the melt to obtain the antibacterial casting PE-LD / PLA degradable composite film.The PE-LD and PLA are mixed in proportion, a compatibilizer is added, an antibacterial agent nano TiO2 is added into a PE-LD / PLA blending system through the coupling agent, and casting is conducted toform a film. The degradable antibacterial preservative film prepared by the invention has very strong antibacterial property and good mechanical property, and can be widely applied to the fields of food preservation, food packaging, other fresh food packaging and the like.

Description

technical field [0001] The invention relates to the field of packaging, in particular to an antibacterial cast PE-LD / PLA degradable composite film. Background technique [0002] Food cling film is widely used in daily life and is of great significance to food quality and safety. At present, the common fresh-keeping films on the market are mainly non-degradable polyolefin plastic films, including polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polyvinylidene chloride (PVDC), etc. These polyolefin polymers are all synthesized from petroleum cracking products, which are non-renewable resources and are also the main members of white pollution. Under the growing low-carbon environmental protection and sustainable development strategy, it is an important research direction for social development to gradually replace non-degradable plastics with degradable and sustainable plastic products. [0003] Among many degradable plastics, PLA is the most promising bio-sou...

Claims

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Application Information

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IPC IPC(8): C08L23/06C08L67/04C08K9/06C08K3/22C08J5/18B65D65/46
CPCC08J5/18B65D65/466C08J2323/06C08J2467/04C08K9/06C08K2003/2241C08K2201/011Y02W90/10Y02A40/90
Inventor 罗文翰彭锡明江美倩肖乃玉张雪琴
Owner ZHONGKAI UNIV OF AGRI & ENG