High breathability PLDxL copolymer film, preparation method and application thereof in fresh keeping of fruits and vegetables

A fruit and vegetable preservation, PLLA-PDMS-PLLA technology, applied in the field of packaging materials, can solve the problems of fruits and vegetables with high respiration rate, deterioration and corruption, etc., and achieve low microbial growth rate and weight loss rate, high sensory score, thermodynamic performance and Effect of improved tensile properties

Active Publication Date: 2019-11-29
INNER MONGOLIA AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And the higher gas permeability of PLLA just makes it have the huge potentiality that uses as fresh food packaging material, but its to O 2 and CO 2 The permeability coefficient tends to be at a medium level, and its gas permeability is difficult to match the high respiration rate of fruits and vegetables
When the packing volume ratio is high, the internal O 2 are rapidly consumed, producing excess CO 2 , the PLLA film cannot exchange gas with the outside world in time, resulting in anaerobic respiration of fruits and vegetables, causing deterioration and corruption, which still does not meet the needs of ideal air conditioning

Method used

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  • High breathability PLDxL copolymer film, preparation method and application thereof in fresh keeping of fruits and vegetables
  • High breathability PLDxL copolymer film, preparation method and application thereof in fresh keeping of fruits and vegetables
  • High breathability PLDxL copolymer film, preparation method and application thereof in fresh keeping of fruits and vegetables

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] The highly gas-permeable PLD of the present embodiment 0.41 The preparation method of L copolymer film, described method specifically comprises the steps:

[0074] (1) First weigh 30 g of purified L-lactide and 1.8 g of PDMS (Mn: 4.1×10 3 , Mw: 4.2×10 3 ) (calculated by the molar ratio of the monomers) into a round-bottomed flask, and performed three gas replacements with inert argon. Pour 50mL of dried toluene into the reaction vessel, control the temperature of the oil bath to 130°C, stir while heating, and inject 0.15g of Sn(Oct) after the L-lactide and toluene are completely dissolved. 2 (5 / 1000 of the monomer mass), reacted for 48h. The reacted crude product was dissolved in 300 mL of chloroform, purified twice with 750 mL of n-hexane, and finally the white solid was vacuum-dried to constant weight, which was the PLLA-PDMS-PLLA triblock copolymer.

[0075] (2) Weigh 1.8g of the synthesized product and dissolve it in 80mL of chloroform, filter the solution and s...

Embodiment 2

[0077] The highly gas-permeable PLD of the present embodiment 1.1 The preparation method of L copolymer film, described method specifically comprises the steps:

[0078] (1) First weigh 30g of purified L-lactide and 7.71g of PDMS (Mn: 1.1×10 4 ) (calculated by the molar ratio of the monomers) into a round-bottomed flask, and performed three gas replacements with inert argon. Pour 50mL of dried toluene into the reaction vessel, control the temperature of the oil bath to 135°C, and stir while heating. After the L-lactide and toluene are completely dissolved, add 0.12g of Sn(Oct) 2 (4 / 1000 of monomer mass), reacted for 36h. The reacted crude product was dissolved in 300 mL of chloroform, purified twice with 750 mL of n-hexane, and finally the white solid was vacuum-dried to constant weight, which was the PLLA-PDMS-PLLA triblock copolymer.

[0079] (2) Weigh 1.8g of the synthesized product and dissolve it in 80mL of chloroform, filter the solution and spread it evenly on a glas...

Embodiment 3

[0081] The highly gas-permeable PLD of the present embodiment 1.8 The preparation method of L copolymer film, described method specifically comprises the steps:

[0082] (1) First weigh 30g of purified L-lactide and 11.14g of PDMS (Mn: 1.8×10 4 ) (calculated by the molar ratio of the monomers) into a round-bottomed flask, and performed three gas replacements with inert argon. Pour 50mL of dried toluene into the reaction vessel, control the temperature of the oil bath to 140°C, and stir while heating. After the L-lactide and toluene are completely dissolved, add 0.09g of Sn(Oct) 2 (3 / 1000 of monomer mass), react for 24h. The reacted crude product was dissolved in 300 mL of chloroform, purified twice with 750 mL of n-hexane, and finally the white solid was vacuum-dried to constant weight, which was the PLLA-PDMS-PLLA triblock copolymer.

[0083] (2) Weigh 1.8g of the synthesized product and dissolve it in 80mL of chloroform, filter the solution and spread it evenly on a glass...

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Abstract

The invention discloses a high breathability PLDxL copolymer film, a preparation method and application thereof in fresh keeping of fruits and vegetables. Specifically, PDMS is embedded as a soft segment into PLLA so as to realize successful introduction of silicon-oxygen bond to the polymer, PLDxL series films with different PDMS contents can be prepared, the adding of PDMS enables a microphase separation structure to appear to the films, the PDMS phase with a particle size of 50-100 nanometers forms channels for gas to pass through in the films, thus improving the CO2 and O2 penetration rateof the material, wherein the CDP and OP of a PLD1.8 L film are increased by 2.34*10<-8> and 0.37*10<-8>cm<3>.m/m<2>.h.Pa respectively; and the PLD1.8L film can maintain the atmosphere of CO2 with a concentration of 8-10% and O2 with a concentration of 0.8-3% in the pack, and is more applicable to the controlled atmosphere fresh-keeping requirements of green vegetable window packaging.

Description

technical field [0001] The invention belongs to the technical field of packaging materials, in particular to a highly air-permeable PLD x L copolymer film and its preparation method and application in fruit and vegetable preservation. Background technique [0002] As fresh-keeping materials widely circulated in the market: polyethylene and polystyrene, etc., their carbon dioxide (CO 2 ), oxygen (O 2 ) permeability and permeability ratio are relatively poor, when the volume ratio of the packaged vegetables is too large, the vegetables produce a large amount of CO through respiration 2 , unable to penetrate to the outside world in a timely and effective manner, resulting in internal CO 2 If the concentration is too high, the vegetables will suffer from acidosis and rot early, losing the meaning of keeping vegetables fresh. [0003] Poly(L-lactic acid) (PLLA), as an important member of the PLA family, also known as corn fiber, is a biodegradable polyester material with a wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08G63/695C08G63/08A23B7/148
CPCA23B7/148C08G63/6952C08J5/18
Inventor 云雪艳董同力嘎陆浩杨阳苏米亚
Owner INNER MONGOLIA AGRICULTURAL UNIVERSITY
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