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A kind of fresh-keeping polylactic acid packaging bag and preparation method thereof

A polylactic acid and packaging bag technology, applied in packaging, wrapping paper, biological packaging, etc., can solve the problems of poor fresh-keeping performance and poor fresh-keeping performance of packaging bags, and achieve improved fresh-keeping performance, improved density, and improved polylactic acid crystallization. sexual effect

Active Publication Date: 2022-05-10
青岛森丽达包装有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] As a new type of polymer material, polylactic acid has been widely used in the preparation of packaging bags due to its good degradability, but the packaging bags made of polylactic acid have poor fresh-keeping performance, especially for bananas and cherries. The fresh-keeping performance of perishable fruits such as mango and mango is poor. Therefore, how to make polylactic acid packaging bags have better fresh-keeping performance is a difficult problem that is urgently needed today.

Method used

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  • A kind of fresh-keeping polylactic acid packaging bag and preparation method thereof

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Embodiment 1

[0032] A fresh-keeping polylactic acid packaging bag mainly includes, by weight parts: 40 parts of polylactic acid, 4 parts of silane coupling agent KH-550, 5 parts of nano silicon dioxide and 8 parts of modified microspheres.

[0033] A preparation method of a fresh-keeping type polylactic acid packaging bag, the preparation method of the fresh-keeping type polylactic acid packaging bag mainly includes the following preparation steps:

[0034] (1) Mix dextran and water in a beaker at a mass ratio of 1:100, and add potassium periodate which is 0.5 times the mass of dextran to the beaker, and stir for 8 hours at a temperature of 0°C and in the dark. Finally, dialyze the inside of the beaker with deionized water for 48 hours, freeze-dry the product obtained after dialyzing to obtain oxidized dextran, mix oxidized dextran and dimethyl sulfoxide in a three-necked flask at a mass ratio of 1:50, and Add triethylamine that is 0.5 times the mass of oxidized dextran into the three-neck...

Embodiment 2

[0042] A fresh-keeping polylactic acid packaging bag mainly includes, by weight parts: 40 parts of polylactic acid, 4 parts of silane coupling agent KH-550, 5 parts of nano silicon dioxide and 8 parts of microspheres.

[0043] A preparation method of a fresh-keeping type polylactic acid packaging bag, the preparation method of the fresh-keeping type polylactic acid packaging bag mainly includes the following preparation steps:

[0044] (1) Mix dextran and water in a beaker at a mass ratio of 1:100, and add potassium periodate which is 0.5 times the mass of dextran to the beaker, and stir for 8 hours at a temperature of 0°C and in the dark. Finally, dialyze the inside of the beaker with deionized water for 48 hours, freeze-dry the product obtained after dialyzing to obtain oxidized dextran, mix oxidized dextran and dimethyl sulfoxide in a three-necked flask at a mass ratio of 1:50, and Add triethylamine that is 0.5 times the mass of oxidized dextran into the three-necked flask,...

Embodiment 3

[0052] A fresh-keeping polylactic acid packaging bag mainly includes, by weight parts: 40 parts of polylactic acid, 4 parts of silane coupling agent KH-550, 5 parts of nano silicon dioxide and 8 parts of modified dextran.

[0053] A preparation method of a fresh-keeping type polylactic acid packaging bag, the preparation method of the fresh-keeping type polylactic acid packaging bag mainly includes the following preparation steps:

[0054] (1) Mix dextran and water in a beaker at a mass ratio of 1:100, and add potassium periodate which is 0.5 times the mass of dextran to the beaker, and stir for 8 hours at a temperature of 0°C and in the dark. Finally, dialyze the inside of the beaker with deionized water for 48 hours, freeze-dry the product obtained after dialyzing to obtain oxidized dextran, mix oxidized dextran and dimethyl sulfoxide in a three-necked flask at a mass ratio of 1:50, and Add triethylamine that is 0.5 times the mass of oxidized dextran into the three-necked fl...

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Abstract

The invention discloses a fresh-keeping polylactic acid packaging bag and a preparation method thereof, and relates to the technical field of polymer materials. In the present invention, dextran is oxidized and then reacted with triethylamine to prepare pretreated dextran, then the pretreated dextran and pretreated cholesterol are mixed and reacted, and then dialyzed to obtain modified dextran. , the modified dextran and polylactic acid were mixed and dialyzed to obtain microspheres. After the microspheres were extracted with formic acid, they were sequentially reacted with epichlorohydrin and hyaluronic acid to obtain modified microspheres. Finally, the modified Mix the microspheres and polylactic acid with dimethyl sulfoxide, add silane coupling agent KH-550 and nano-silica, stir and mix to make a film-forming liquid, and put the film-forming liquid into a film and put it in a bag-making machine In the production of bags, fresh-keeping polylactic acid packaging bags are obtained. The polylactic acid packaging bag prepared by the invention has an excellent fresh-keeping function, especially for fruit foods.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a fresh-keeping polylactic acid packaging bag and a preparation method thereof. Background technique [0002] Packaging bag, also known as container bag, is a kind of flexible transportation packaging container, which is widely used in the transportation packaging of food, grain, medicine, chemical industry, mineral products and other powdery, granular and lumpy items. [0003] With the entry of society, people pay more and more attention to the concept of environmental protection. Nowadays, due to the extensive use of non-degradable packaging bags, the white pollution of the environment is serious, so it is particularly important to develop degradable packaging bags. [0004] As a new type of polymer material, polylactic acid has been widely used in the preparation of packaging bags due to its good degradability, but the packaging bags made of polylactic acid have poor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08L5/08C08L5/02C08L87/00C08K3/36C08K5/544C08J5/18C08G81/00C08B37/02C08B37/08B65D65/46
CPCC08J5/18C08G81/00C08B37/0072C08B37/0009C08B37/0024B65D65/466C08J2367/04C08J2405/08C08J2405/02C08J2467/04C08J2487/00C08K3/36C08K5/544C08K2201/011Y02W90/10Y02A40/90
Inventor 杨宝森赵云王琳
Owner 青岛森丽达包装有限公司