Epoxy tannin reaction product compositions
The present application generally relates to epoxy/tannin reaction product compositions, and methods of making and using the epoxy tannin reaction product compositions. The epoxy/tannin reaction product compositions are hardened thermosetting polymeric materials, are substantially homogeneous and substantially free of visible clumps, and have a glass transition temperature of at least 140° C.
1. A thermosetting polymeric composition, wherein the thermosetting polymeric composition comprises a reaction product of a mixture comprising:
an epoxy material; and
a tannin,
wherein the thermosetting polymeric composition is a hardened polymeric material and is substantially homogenous,
wherein the weight percentage of tannin is 3-50%, the epoxy material is 50-97% of the total weight of the epoxy material and the tannin,
wherein the thermosetting polymeric composition has a glass transition temperature of at least 160° C.
2. The thermosetting polymeric composition of claim 1 , wherein the thermosetting polymeric composition is substantially free of visible clumps.
3. The thermosetting polymeric composition of claim 1 , wherein the epoxy material is selected from the group consisting of epoxy-containing polyethers, epoxy-containing polyesters, epoxy-containing polyurethanes, epoxy-containing acrylics, and any combination thereof.
4. The thermosetting polymeric composition of claim 3 , wherein the epoxy material comprises a polyepoxide.
5. The thermosetting polymeric composition of claim 4 , wherein the epoxy material comprises Diglycidylether Bisphenol A (DGEBA).
6. The thermosetting polymeric composition of claim 1 , wherein the tannin has a structure comprises at least a gallic acid unit and at least one terminal phenolic hydroxyl groups.
7. The thermosetting polymeric composition of claim 1 , wherein the thermosetting polymeric composition has a thermal degradation temperature of at least 400° C.
8. The thermosetting polymeric composition of claim 1 , wherein the epoxy material is 60-80% by weight, and the tannin is 20-40% by weight.
9. The thermosetting polymeric composition of claim 1 , wherein the tannin is also functioned as a hardening agent and a crosslinking agent.
10. The thermosetting polymeric composition of claim 1 , wherein the reaction is heated at temperature between 100-180° C.
11. The thermosetting polymeric composition of claim 1 , wherein the thermosetting polymeric composition is cured at a temperature between 130-180° C.
12. A method of preparing the thermosetting polymeric composition of claim 1 , wherein the method comprising:
a) heating the epoxy material and the tannin at a temperature between 100-180° C. until a substantially homogeneous solution is obtained; and
b) curing the substantially homogeneous solution between 130-180° C. until the solution is hardened.