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Preparation method of glass paper/polylactic acid/nanocellulose composite membrane

A technology of nano-cellulose and cellophane, applied in cellulose coatings, polyester coatings, coatings, etc., can solve problems such as poor mechanical strength, achieve simple and controllable operation, improve mechanical strength and surface waterproof performance, and compact structure Effect

Inactive Publication Date: 2017-05-10
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Purpose of the invention: In view of the defects that traditional cellophane membrane materials are easy to absorb water, have poor mechanical strength, and are difficult to be directly applied in practice, the purpose of this invention is to provide a kind of preparation method of cellophane / polylactic acid / nanocellulose composite membrane, using poly Lactic acid and cellulose nanofibers are combined, and the method of improving the mechanical strength and surface waterproof performance of the cellophane membrane material through chemical crosslinking agent modification interface has the characteristics of simple process, low cost and remarkable effect, and is easy to realize industrialization

Method used

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  • Preparation method of glass paper/polylactic acid/nanocellulose composite membrane
  • Preparation method of glass paper/polylactic acid/nanocellulose composite membrane

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Experimental program
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Effect test

Embodiment 1

[0029] Cut the dried cellophane into 8cm*8cm samples and soak them in 0.1% ethanol solution of silane coupling agent. After soaking for 30 minutes, take out the samples and air dry them naturally to obtain the modified cellophane for later use.

[0030] Dissolve 0.3g and 0.6g of polylactic acid (PLA) in 100g of dichloromethane to prepare 0.3% and 0.6% PLA dichloromethane solutions for later use; take 0.2g of PEG-4000 and dissolve in 100g of 0.4% PLA Cellulose nanofiber (CNF) dispersion, after freeze-drying to obtain a CNF-PEG composite with a PEG coating of 50%, take 0.12g of the CNF-PEG composite and disperse it in 100g of dichloromethane solution, and then with the concentration Mix equal volumes of 0.6% PLA solution to obtain PLA / CNF mixed dispersion for later use.

[0031] The modified cellophane samples were respectively immersed in the PLA solution with a concentration of 0.3% and the PLA / CNF dispersion with a ratio of CNF to PLA of 0.2, and the soaking time was 30 min. ...

Embodiment 2

[0033] Cut the dried cellophane into 8cm*8cm samples and soak them in 0.2% ethanol solution of silane coupling agent. After soaking for 30 minutes, take out the samples and air dry them naturally to obtain the modified cellophane for later use.

[0034] Dissolve 0.3g and 0.6g of polylactic acid (PLA) in 100g of dichloromethane to prepare 0.3% and 0.6% PLA dichloromethane solutions for later use; take 0.2g of PEG-4000 and dissolve in 100g of 0.4% PLA CNF dispersion liquid, after freeze-drying, obtain the CNF-PEG complex with 50% PEG coating amount, take 0.12g of CNF-PEG complex and disperse it in 100g of dichloromethane solution, and then make it equal volume with 0.6% PLA solution Mix to get the PLA / CNF mixed dispersion for later use.

[0035] The modified cellophane samples were respectively immersed in the PLA solution with a concentration of 0.3% and the PLA / CNF dispersion with a ratio of CNF to PLA of 0.2, and the soaking time was 30 min. After taking it out, it was air-d...

Embodiment 3

[0037] Cut the dried cellophane into 8cm*8cm samples and soak them in 0.2% ethanol solution of silane coupling agent. After soaking for 30 minutes, take out the samples and air dry them naturally to obtain the modified cellophane for later use.

[0038]Dissolve 0.1g and 0.2g of polylactic acid (PLA) in 100g of dichloromethane to prepare 0.1% and 0.2% PLA dichloromethane solutions for use; take 0.2g of PEG-4000 and dissolve in 100g of 0.4% PLA CNF dispersion, after freeze-drying to obtain a CNF-PEG complex with a PEG coating amount of 50%, take 0.04g of the CNF-PEG complex and dissolve it in 100g of dichloromethane solution, and then make it equal to the volume of 0.2% PLA solution Mix to get the PLA / CNF mixed dispersion for later use.

[0039] The modified cellophane samples were respectively immersed in the PLA solution with a concentration of 0.1% and the PLA / CNF dispersion with a ratio of CNF to PLA of 0.2, and the soaking time was 30 min. After taking it out, it was air-d...

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Abstract

The invention discloses a preparation method of a glass paper / polylactic acid / nanocellulose composite membrane. The preparation method comprises the following steps: firstly, taking traditional glass paper as a base material; modifying the surface of the glass paper through an immersion manner, so as to improve the interface compatibility between the glass paper and a composite layer; secondly, compounding polylactic acid on the surface of the modified glass paper, so as to improve the waterproof performance and enhance the mechanical properties of the traditional glass paper to a certain extent; thirdly, uniformly dispersing cellulose nanofibers into a dichloromethane solution by adopting a method of compounding polyethylene glycol and mixing with a polylactic acid solution; forming the composite layer by the glass paper modified by immersion; finally, obtaining a high-intensity and waterproof glass paper / polylactic acid / nanocellulose composite membrane material. According to the preparation method disclosed by the invention, the problem that the polylactic acid in a lamination layer is easy to fall off is solved through carrying out interface modification and uniformly adding the cellulose nanofibers; the waterproof performance and the mechanical strength of the traditional glass paper are greatly improved and a process is simple so that industrialization is easier to realize.

Description

technical field [0001] The invention belongs to the field of packaging materials, and specifically relates to a method for improving mechanical strength and surface waterproof performance of cellophane and polylactic acid through composite cellulose nanofibers through chemical crosslinking agents, especially a cellophane / polylactic acid / nanofiber Preparation method of plain composite film. Background technique [0002] Cellophane (PT), also known as cellophane, is a regenerated cellulose film. Cellophane is transparent, non-toxic, odorless, and completely degradable. It has a good barrier effect on oily, alkaline, and organic solvents. Compared with ordinary plastics, it has the characteristics of no static electricity, dustproof, and good kink performance. Fire-resistant but heat-resistant, and has good degradation resistance. But it is precisely because the raw material of cellophane is cellulose that it has strong hydrophilicity, and it often sticks when it encounters w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/12C08J7/04C09D101/04C09D167/04C08L1/02
CPCC08J7/0427C08J7/12C08J2301/02C08J2401/04C08J2467/04C08L2205/16C09D101/04C09D167/04C08L67/04
Inventor 王志国张莉莉段毓范一民
Owner NANJING FORESTRY UNIV
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