Carbodiimide-containing compositions and method for the production and use thereof
Carbodiimide containing compositions include diilsocyenates, polyols, and liquid carbodiimide of the formula where R 1 , R 2 , R 4 and R 6 are each independently C 3 -C 6 -alkyl, and R 3 and R 5 are each independently C 1 -C 3 -alkyl.
1. A composition comprising:
a polyether ester polyol that is liquid at temperatures of 30° C.-80° C., and/or a polyester polyol that is liquid at temperatures of 30° C.-80° C.;
a carbodiimide of the formula (I) that is liquid at room temperature
where R 1 , R 2 , R 4 and R 6 are each independently C 3 -C 6 -alkyl, and
R 3 and R 6 are each independently C 1 -C 3 -alkyl, and
a diisocyanate,
where a ratio of diisocyanate to polyol is 20-50:100 parts by weight.
2. The composition as claimed in claim 1 , wherein the R 1 to R 6 radicals are the same within the molecule.
3. The composition as claimed in claim 2 , wherein the R 1 to R 6 radicals are isopropyl.
4. The composition as claimed in claim 1 , further comprising a mixture of a plurality of carbodiimides of the formula (I).
5. The composition as claimed in claim 1 , additionally comprising a catalyst.
6. The composition as claimed in claim 5 , additionally comprising a diamine and/or a further short-chain diol having a molar mass less than 200 g/mol.
7. The composition of claim 1 , wherein the ratio of diisocyanate to polyol is 25 to 35:100 parts by weight.
8. The composition of claim 1 , wherein the polyols have a molecular weight of 1000 to 2000 g/mol, and an OH number of 20 to 150.
9. The composition of claim 8 , wherein:
the ratio of diisocyanate to polyol is 25:100 to 35:100 parts by weight;
the ratio of carbodiimide to polyol is 0.1:100 to 5:100 parts by weight; and
the composition additionally comprises, based on the weight of the composition:
0.01 to 1 wt % of a catalyst; and
5 to 30 wt % of a diamine and/or a further short-chain did having a molar mass less than 200 g/mol.
10. A process for preparing the composition as claimed in claim 1 , the process comprising charging a vessel with the polyol and stirring or metering the liquid carbodiimide of formula (I) or a mixture of liquid carbodiimides of formula (I) into the polyol.
11. The process for preparing a composition as claimed in claim 10 , further comprising stirring the diisocyanate into the composition composed of polyol and carbodiimide of formula (I) at temperatures between 80 and 130° C.
12. A process for preparing a composition as claimed in claim 6 , the process comprising premixing the catalyst with the diamine and/or the further short-chain diol having a molar mass less than 200 g/mol to produce a premix, and stirring the premix into a composition composed of the polyol, the carbodiimide of formula (I) and the diisocyanate at temperatures between 40° C. and 100° C.
13. A polymer obtained by reaction of:
a polyether ester polyol that is liquid at temperatures of 30° C.-80° C., and/or a polyester polyol that is liquid at temperatures of 30° C.-80° C., and
a carbodiimide of the formula (I) that is liquid at room temperature
where R 1 , R 2 , R 4 and R 6 is each independently C 3 -C 6 -alkyl, and
R 3 and R 5 is each independently C 1 -C 3 -alkyl,
with a diisocyanate at temperatures between 80° C. and 130° C., where a ratio of diisocyanate to polyol is 20-50:100 parts by weight.
14. The polymer of claim 13 , wherein the ratio of diisocyanate to polyol is 25 to 35:100 parts by weight.