Methods and compositions for cellulose epoxide composites

Patent metadata

Field	Value
Publication number	US-2016200934-A1
Application number	US-201614990293-A
Country	US
Kind code	A1
Filing date	Jan 7, 2016
Priority date	Jan 8, 2015
Publication date	Jul 14, 2016
Grant date	—

Abstract

Embodiments of the present disclosure provide for compositions and methods of making a waterborne epoxide resin that contains cellulose nanocrystals or nanofibrils.

First claim

We claim:

1 . A method of making a waterborne epoxide resin comprising:
mixing an epoxide suspension with cellulose to form mixture A; stirring mixture A for about one hour or more; and adding a protic crosslinker to mixture A and further stirring to form mixture B.

2 . The method of claim 1 , wherein the cellulose is cellulose nanocrystals.

3 . The method of claim 2 , wherein the cellulose is wood-based cellulose nanocrystals.

4 . The method of claim 3 , wherein the wood-based cellulose nanocrystals are freeze-dried.

5 . The method of claim 1 , wherein the cellulose is cellulose nanofibrils.

6 . The method of claim 5 , wherein the cellulose is wood-based cellulose nanofibrils.

7 . The method of claim 6 , wherein the wood-based cellulose nanofibrils are freeze-dried.

8 . The method of claim 1 , wherein the epoxide is selected from the group consisting of: bisphenol A diglycidyl ether, bisphenol-F diglycidyl ether, epoxy phenol novolacs or epoxy cresol novolacs, aliphatic or cycloaliphatic epoxides, and glycidyl amines.

9 . The method of claim 1 , wherein the epoxide is bisphenol A diglycidyl ether.

10 . The method of claim 1 , wherein the protic crosslinker includes a function group selected from the group consisting of: phenols, anhydrides, aromatic or aliphatic amines, carboxylic acids, acid anhydrides, thiols, and a combination thereof.

11 . The method of claim 1 , wherein the protic crosslinker is poly(oxypropylenediamine).

12 . A method of making an epoxy/cellulose composite film comprising:
precuring mixture B of claim 1 at room temperature, casting the mixture onto a silicon wafer solid substrate to form a coated substrate, and curing the coated substrate in an oven to form the epoxy/cellulose film.

13 . The method of claim 12 , wherein the cellulose is about 0.01-20 wt. % of the epoxy/cellulose film.

14 . A composition comprising:
a waterborne epoxide resin formed by: mixing an epoxide suspension with aqueous cellulose suspension to form mixture A; stirring mixture A for about one hour or more; adding a protic crosslinker to mixture A and further stirring to form mixture B, wherein the cellulose is about 0.01-20 wt. % of the of the waterborne epoxide resin, wherein the waterborne epoxide has a pot life of about 30 days or longer than waterborne epoxide formed using a single-step mixing process, and optionally has a work of fracture of about 50-150% greater than an epoxy formed using a single-step mixing process, and exhibits lower birefringence than the epoxy formed using a single-step mixing process.

15 . The composition of claim 14 , wherein the cellulose is cellulose nanocrystals or cellulose nanofibrils.

16 . The composition of claim 15 , wherein the cellulose is wood-based cellulose nanocrystals or cellulose nanofibrils.

17 . The composition of claim 15 , wherein the wood-based cellulose nanocrystals or cellulose nanofibrils are freeze-dried.

Assignees

• Georgia Tech Res Inst
• Us Agriculture

Inventors

• Meredith Iii James Carson
• Girouard Natalie
• Schueneman Gregory T
• Shofner Meisha

Classifications

• C09D163/00 Primary

  Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins · CPC title

• C09D101/02

  Cellulose; Modified cellulose · CPC title

• C09D101/04

  Oxycellulose; Hydrocellulose · CPC title

• C08L1/04

  Oxycellulose; Hydrocellulose {, e.g. microcrystalline cellulose} · CPC title