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High-barrier degradable film and preparation method thereof

A degradable film, high barrier technology, applied in coatings, cellulose coatings, etc., can solve the problems of low barrier properties, poor heat resistance, poor mechanical properties of high barrier films, etc., to achieve low cost, excellent barrier properties, and application range wide effect

Inactive Publication Date: 2021-10-26
安徽鼎洋生物基材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the current high-barrier films have poor mechanical properties, and do not have anti-oxidation and anti-ultraviolet properties. They have low barrier properties to water vapor and oxygen, and poor heat resistance, which limits their application in harsh environments. Therefore, providing a A kind of high-barrier degradable film with good mechanical properties, heat resistance, oxidation resistance and ultraviolet resistance and its preparation method are technical problems to be solved at present

Method used

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  • High-barrier degradable film and preparation method thereof
  • High-barrier degradable film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Modified hexagonal boron nitride is made by the following steps:

[0050] Step S11, add 1mmol of p-tolualdehyde, 1.0mmol of 2-(bromomethyl)acrylic acid, 5mL of THF and 5mL of deionized water into a round bottom flask, stir for 3min, add 1.1mmol of indium powder, magnetically stir, and track by TLC. After the raw material point of aldehyde disappears, add hydrochloric acid solution and stir for 3 hours, extract with ethyl acetate, dry with anhydrous sodium sulfate, filter, and rotary evaporate under reduced pressure to obtain intermediate 1;

[0051] Step S12: Add 0.1 mol of intermediate 1, 0.1 mol of coupling agent KH-590 and 68 mL of toluene solvent into the three-necked flask, stir at a speed of 60 r / min for 5 min, inject nitrogen gas, raise the temperature to 40 ° C, and add 2 mL of triethylamine, Reflux reaction for 50min to obtain intermediate 2;

[0052] Step S13, add 2.1g of intermediate 2 and 25mL of DMF into the reaction kettle, add 0.3g of potassium permangan...

Embodiment 2

[0056] Modified hexagonal boron nitride is made by the following steps:

[0057] Step S11, add 1mmol of p-tolualdehyde, 1.2mmol of 2-(bromomethyl)acrylic acid, 5mL of THF and 8mL of deionized water into a round bottom flask, stir for 3min, then add 1.1mmol of indium powder, magnetically stir, and track by TLC. After the raw material point of aldehyde disappears, add hydrochloric acid solution and stir for 6 hours, extract with ethyl acetate, dry with anhydrous sodium sulfate, filter, and rotary evaporate under reduced pressure to obtain intermediate 1;

[0058] Step S12: Add 0.1 mol of intermediate 1, 0.1 mol of coupling agent KH-590 and 72 mL of toluene solvent into the three-necked flask, stir at 80 r / min for 5 min, inject nitrogen gas, raise the temperature to 40 °C, add 4 mL of triethylamine, Reflux reaction for 50min to obtain intermediate 2;

[0059] Step S13, add 2.4g of intermediate 2 and 28mL of DMF into the reaction kettle, add 0.3g of potassium permanganate and 6mL...

Embodiment 3

[0063] Modified nanocellulose is made by the following steps:

[0064] Step S21, add 2.1g nanocellulose and 25mL deionized water into a three-necked flask, stir for 3min, then add 1.5mL acidic NaIO 4 The solution was placed in a dark place at 40°C and stirred for 4 hours. After the reaction was completed, it was dialyzed for 2 days and dried by centrifugation to obtain intermediate a;

[0065] Step S22: Add 2.5 g of 3,5-bis(tert-butyl)-4-hydroxyphenylpropionyl chloride and 5 mL of acetonitrile into the reaction kettle, add 2 mL of hydrazine hydrate dropwise after stirring for 5 min, stir in an ice bath for 15 min, and filter , the filter cake was washed with ethanol for 3 times, and dried to constant weight at 45°C to obtain intermediate b; 50 mmol of intermediate b and 42.4 mL of DMF were added to a three-necked flask, and 5 mL of a DMF solution of intermediate a was added dropwise to the three-necked flask , stirred and reacted at 80° C. for 3 hours, after the reaction was ...

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Abstract

The invention relates to a high-barrier degradable film, which belongs to the technical field of film preparation. The high-barrier degradable film is obtained by coating a film substrate in a PVA coating liquid and drying. The PVA coating liquid is prepared by the following steps of 1, preparing the following raw materials in parts by weight: 30-60 parts of polyvinyl alcohol, 10-15 parts of absolute ethyl alcohol, 5-10 parts of deionized water, 3-5 parts of modified hexagonal boron nitride, 3-5 parts of modified nano cellulose, 2-3 parts of boric acid and 0.3 part of an antibacterial agent, and 2, sequentially adding all the raw materials into a reaction kettle, and evenly stirring and mixing,. Modified hexagonal boron nitride has high barrier performance, heat resistance and ultraviolet absorption performance, nanofibers are grafted with an intermediate b containing a hindered phenol structure through a chemical grafting method, and modified nanocellulose is obtained; the film prepared by the invention has a toughening effect and also has an anti-oxidation effect, so that the film prepared by the invention has the properties of high barrier, degradability, oxidation resistance and ultraviolet resistance.

Description

technical field [0001] The invention belongs to the technical field of film preparation, and in particular relates to a high-barrier degradable film and a preparation method thereof. Background technique [0002] PVA-coated high-barrier film is made by coating modified PVA on polyethylene film and then printing and compounding. The oxygen barrier rate is less than 2cm 3 / (m 2 ·24h·0.1MPa). Its barrier performance is not only significantly better than EVOH five-layer co-extrusion film, but also the packaging cost is greatly reduced, which can not only ensure the quality requirements of the packaged objects for aseptic packaging, but also greatly reduce the cost of aseptic packaging for food processing enterprises. It solves the technical bottleneck of poor barrier performance of the current three-layer polyethylene co-extruded packaging film, and can be used for packaging beverages, fruit juices, milk, soy sauce and vinegar, etc. PVA-coated high-barrier film is processed t...

Claims

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Application Information

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IPC IPC(8): C08J7/048C09D129/04C09D101/04C09D7/62C08B15/06C08B15/02C08L67/02C08L77/00
CPCC08J7/048C09D129/04C09D7/62C08B15/06C08B15/02C08J2367/02C08J2377/00C08J2429/04C08K2003/385C08K2201/011C08L2201/08C08L1/04C08K9/06C08K3/38
Inventor 顾程松张毅倩杨国栋
Owner 安徽鼎洋生物基材料有限公司
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