Unlock instant, AI-driven research and patent intelligence for your innovation.

Preparation method for regenerated cellulose/epoxy resin composite film

An epoxy resin, regenerated cellulose technology, applied in the field of polymer materials, can solve the problems of unfavorable industrial development, high temperature, poor light transmittance, etc., and achieve easy industrial production, improved light transmittance, and increased elongation at break. Effect

Inactive Publication Date: 2013-12-25
JIANGNAN UNIV
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Recently, some researchers have obtained a high-performance cellulose film by reacting with a composite system formed by natural cellulose nanofibers and epoxy resin, but the light transmittance of the film is poor, and its light transmittance can reach 71% after polishing. (Masaya Nogi, Shinichiro Iwamoto, Antonio Norio Nakagaito, and Hiroyuki Yano, Optically Transparent Nanofiber Paper, Adv. Mater. 2009, 21, 1595-1598)
Cai Jie et al. used cellulose airgel as a starting material to introduce acrylic acid series polymer monomers into cellulose airgel, and then obtained a cellulose / polyacrylic acid composite film with better performance by free radical polymerization. , the light transmittance, physical properties and water resistance of this film can be improved (Chinese patent, CN 101906233A), but the high temperature required for the preparation process is not conducive to large-scale industrial development

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method for regenerated cellulose/epoxy resin composite film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] First cool the solution of NaOH / urea / water (7wt% / 12wt% / 81wt%, wt% means mass percentage) to -12°C, then put the natural cellulose raw material with a degree of polymerization of 500 into it, and stir it mechanically at room temperature Dissolve the natural cellulose quickly to obtain a 4wt% cellulose solution. After the solution is centrifugally degassed, it is coated on a glass plate by casting method, then immersed in a 5wt% sulfuric acid solution to solidify and regenerate, and finally The regenerated cellulose membrane can be obtained by washing with water.

[0019] The cellulose membrane is washed with water to remove inorganic salts and other impurities, and then the water in it is gradually replaced with methanol solvent.

[0020] Then dip it into epoxy resin / curing agent / acetone (mass ratio is 30 / 9 / 60, epoxy resin is bisphenol A epoxy resin BE-188EL (belonging to glycidyl ether epoxy resin), curing agent After 2 hours in the mixed solution composed of polyether...

Embodiment 2

[0022] The cellulose film was obtained by dissolving the natural cellulose with a degree of polymerization of 500 in a solvent system of NaOH / urea / water (7wt% / 12wt% / 81wt%), and the method was the same as in Example 1.

[0023] The cellulose membrane is washed with water to remove inorganic salts and other impurities, and then the water in it is gradually replaced with methanol solvent.

[0024] Then dip it into epoxy resin / curing agent / acetone (the mass ratio is 45 / 13.5 / 60, the epoxy resin is bisphenol A type epoxy resin BE-188EL (glycidyl ether epoxy resin), the curing agent is After 6 hours in the mixed solution composed of polyetheramine curing agent EC301). At this point the mixed solution can penetrate into the cellulose membrane. Then it was taken out and cured at a temperature of 40°C for 36 hours to obtain a regenerated cellulose / epoxy resin composite film.

Embodiment 3

[0026] The cellulose film was obtained by dissolving the natural cellulose with a degree of polymerization of 500 in a solvent system of NaOH / urea / water (7wt% / 12wt% / 81wt%), and the method was the same as in Example 1.

[0027] The cellulose membrane is washed with water to remove inorganic salts and other impurities, and then the water in it is gradually replaced with methanol solvent.

[0028] Then dip it into epoxy resin / curing agent / acetone (mass ratio is 60 / 18 / 60, epoxy resin is bisphenol A type epoxy resin BE-188EL (glycidyl ether epoxy resin), curing agent is After 8 hours in the mixed solution composed of polyetheramine curing agent EC301). At this point the mixed solution can penetrate into the cellulose membrane. Then it was taken out and cured at 20° C. for 36 hours to obtain a regenerated cellulose / epoxy resin composite film.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
degree of polymerizationaaaaaaaaaa
degree of polymerizationaaaaaaaaaa
transmittivityaaaaaaaaaa
Login to View More

Abstract

The invention discloses a preparation method for a regenerated cellulose / epoxy resin composite film. The preparation method comprises the following specific steps of: (1) preparing a cellulose film; (2) washing the cellulose film obtained in the step (1) with deionized water, and substituting moisture in the cellulose film with an organic solvent A; and (3) dissolving epoxy resin and a curing agent into an organic solvent B, immerging the cellulose film obtain in the step (2) into a dissolved solution of the epoxy resin and the curing agent for 2-12 hours, taking the cellulose film out, and performing thermal curing at the temperature of 20-60 DEG C for 4-36 hours to obtain the regenerated cellulose / epoxy resin composite film. The regenerated cellulose / epoxy resin composite film prepared with the method has high uniformity, high light transparency and high mechanical performance.

Description

technical field [0001] The invention relates to the field of macromolecular materials, in particular to a film compounded by regenerated cellulose and epoxy resin. Background technique [0002] Cellulose is currently the most abundant renewable organic resource on the earth. It is non-toxic, and the cellulose film made of it can be quickly decomposed into CO in nature after being discarded. 2 and H 2 O, little pollution to the environment. However, the pure cellulose film has good hydrophilicity and is easy to absorb moisture and swell, resulting in a sharp drop in its mechanical properties and poor air permeability, thus limiting its application. In order to improve the performance of cellulose film, cellulose derivatives are obtained by chemical modification, and then cellulose derivatives are prepared into cellulose-based film materials, such as cellulose acetate, hydroxymethyl cellulose, etc. have been reported. Cellulose based film material. [0003] Recently, some ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18C08L1/02C08L63/00
Inventor 刘石林陶丹丹刘敬成白绘宇刘晓亚
Owner JIANGNAN UNIV