Composition for manufacturing a tannin-based foam material, foam material obtainable from it, and manufacturing process thereof
A composition for manufacturing a foam material based on flavonoid tannins, includes a flavonoid tannin powder mainly of the prorobineditinidin and/or the profisetinidin type, according to an amount in weight in the range between 40% and 45% of the composition, furfuryl alcohol, a blowing agent, and a catalyst. The composition is totally formaldehyde-free, and contains an amount of furfuryl alcohol greater than 20% in weight of the composition. The composition makes possible to obtain foam materials of high characteristics and low cost, that can typically be used in the fields of building and in the automotive industry and in the vehicles in general.
1. A composition for manufacturing a foam material based on a prorobineditinidin tannin and/or a profisetinidin tannin comprising between 40% and 45% by weight of the composition of the tannin, furfuryl alcohol, a blowing agent, and a catalyst,
wherein the composition contains an amount of furfuryl alcohol greater than 20% in weight of the composition, and in that the composition is totally formaldehyde-free.
2. The composition according to claim 1 , wherein said blowing agent has a boiling point between 30° C. and 100° C.
3. The composition according to claim 2 , wherein said blowing agent is based on ethylether, pentane, and/or a mixture of pentane isomers.
4. The composition according to claim 3 , wherein said blowing agent is diethyl ether.
5. The composition according to claim 1 , wherein said catalyst is based on an acid, of the organic or of the inorganic type.
6. The composition according to claim 5 , wherein said catalyst is p-toluensulfonic acid (p-TSA).
7. The composition according to claim 5 , wherein said catalyst is trichloroacetic acid.
8. The composition according to claim 1 , wherein the composition contains an amount of blowing agent greater than 5% in weight, and an amount of catalyst smaller than 16% in weight of the composition.
9. The composition according to claim 1 , wherein the composition contains up to 15% in weight of water.
10. The composition according to claim 8 , wherein the composition also contains an isocyanate.
11. The composition according to claim 2 , wherein said blowing agent has a boiling point between 40° C. and 60° C.
12. The composition according to claim 10 , wherein the isocyanate comprises a polymeric isocyanate (PMDI).
13. A process for manufacturing a product of organic foam material usable as a thermal insulator, said process comprising the steps of:
providing a mould having a shape which corresponds to that of the product to be obtained,
providing furfuryl alcohol and a blowing agent having a boiling point in the range between 30° C. and 100° C., and mixing together such components,
providing a flavonoid tannin powder, comprising a prorobineditinidin tannin and/or a profisetinidin tannin, and incorporating the flavonoid tannin powder in the mixture of the furfuryl alcohol and the blowing agent, and mixing the mixture so obtained,
adding an acid-based catalyst to the mixture obtained, and mixing,
pouring the mixture thus obtained into the mould, and allowing the components react until the composition is completely foamed in the mould.
14. The process according to claim 13 , further comprising the step of adding a predetermined amount of water to the mixture of furfuryl alcohol and blowing agent.
15. The process according to claim 13 , wherein the furfuryl alcohol is provided in an amount greater than 20% in weight of the composition, the blowing agent is provided in an amount greater than 5% in weight of the composition, water is provided in to an amount between about 0% and 15% in weight of the composition, the catalyst is provided in an amount less than 16% in weight of the composition, and the tannin is provided an amount between 40% and 45% in weight of the composition.
16. The process according to claim 15 , further comprising the step of adding an isocyanate to the aforesaid mixture of components.
17. The process according to claim 16 , wherein the isocyanate comprises a polymeric isocyanate (PMDI).
18. The process according to claim 13 , wherein the acid-based catalyst comprises p-toluensufonic acid (p-TSA) or trichloroacetic acid.
19. The process according to claim 13 , wherein the blowing agent comprises diethyl ether.
20. The tannin-based organic foam material, obtained by the process of claim 17 .