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A high air permeability pld x l Copolymer film and preparation method thereof and application in preservation of fruits and vegetables

A fruit and vegetable preservation, PLLA-PDMS-PLLA technology, applied in the field of packaging materials, can solve problems such as spoilage and difficulty matching high respiration rate fruits and vegetables, and achieve high sensory scores, low microbial growth rate and weight loss rate, and tensile properties. improved effect

Active Publication Date: 2021-05-25
INNER MONGOLIA AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A high air permeability pld <sub>x</sub> l Copolymer film and preparation method thereof and application in preservation of fruits and vegetables
  • A high air permeability pld <sub>x</sub> l Copolymer film and preparation method thereof and application in preservation of fruits and vegetables
  • A high air permeability pld <sub>x</sub> l Copolymer film and preparation method thereof and application in preservation of fruits and vegetables

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Experimental program
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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 air permeability PLD x L copolymer film and its preparation method and application in fruit and vegetable preservation. In the present invention, by using PDMS as a soft block in PLLA, the successful introduction of silicon-oxygen bonds into the polymer is achieved, and PLDxL series films with different PDMS contents are prepared. The addition of PDMS makes the film appear a microphase separation structure, 50 The PDMS phase with a particle size of ~100 nm forms channels for gas passage inside the membrane, which improves the CO of the material. 2 , O 2 Transmittance, where PLD 1.8 The CDP and OP of the L film increased by 2.34×10 ‑8 , 0.37×10 ‑8 cm 3 m / m 2 ·h·Pa, where PLD 1.8 The L film can maintain the CO inside the package 2 : 8~10%, O 2 : The atmosphere with a concentration of 0.8-3%, is more suitable for the modified atmosphere fresh-keeping requirements of the green leafy vegetable form 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 Patents(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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