Polyisocyanate composition, a polyurethane foam obtained therefrom and use thereof
Described herein is an isocyanate composition, a polyurethane foam obtained therefrom and a method of using the polyurethane foam in an article.
1. An isocyanate composition, comprising:
(a) at least one isocyanate,
(b) a first blowing agent, and
(c) at least one surfactant,
wherein the surfactant does not contain any reactive functional group towards NCO and has a Dynamic Surface Tension (DST) in between 40 mN/m to 60 mN/m, when measured at a concentration of 0.1 wt.-% and frequency of 1 Hz in distilled water, and wherein the first blowing agent has a boiling point in between −50° C. to 5° C., and
wherein said composition excludes a polyol.
2. The composition according to claim 1 , wherein the isocyanate is aromatic isocyanate, aliphatic isocyanate, or a combination thereof.
3. The composition according to claim 2 , wherein the aromatic isocyanate is methylene diphenyl diisocyanate and/or polymeric methylene diphenyl diisocyanate.
4. The composition according to claim 1 , wherein the first blowing agent comprises a hydrofluoroolefin.
5. The composition according to claim 4 , wherein the hydrofluoroolefin is trans-1,3,3,3-tetrafluoropropene (HFO-1234ze(E)).
6. The composition according to claim 1 , wherein the surfactant is a non-ionic surfactant.
7. The composition according to claim 6 , wherein the non-ionic surfactant comprises a polyether polysiloxane or a polyether siloxane or a mixture thereof.
8. The composition according to claim 1 further comprising a compatibilizer.
9. A process for preparing a polyurethane foam, the process comprising reacting:
(A) the isocyanate composition according to claim 1 , and
(B) a polyol composition,
in the presence of
(C) a second blowing agent, and
(D) at least one catalyst.
10. The process according to claim 9 , wherein the isocyanate index is in between 70 to 350.
11. A process for producing a spray polyurethane foam, comprising:
(S1) spraying a reaction mixture comprising:
(i) the isocyanate composition according to claim 1 , and
(ii) a resin mixture comprising a polyol composition, and
(S2) allowing the reaction mixture to react.
12. The isocyanate composition according to claim 1 , wherein said isocyanate composition has a viscosity at 25° C. of between 50 mPas to 700 mPas.
13. The isocyanate composition according to claim 1 , wherein said isocyanate composition is phase stable and/or storage stable for at least six months.