POLYURETHANE-FOAMED FORMULATIONS AND NOISE INSULATIONS WITH FOAMS BASED THEREON

Abstract

Disclosed is a polyurethane foam formulation based on conventional polyether and polyester polyols based on renewable raw materials, with in particular MDI, for the production of preferably viscoelastic PUR moulded foams and sound insulations with foams based thereon.

Claims

1: A polyurethane foam formulation for the production of viscoelastic PUR moulded foams comprising: a) a polyester polyol having a hydroxyl functionality of 2, and a hydroxyl value in the range of 50 to 150 mgKOH/g b) optionally, a polyether polyol having a hydroxyl functionality of 3, and a hydroxyl value in the range of 180 to 250 mgKOH/g c) a polyether polyol having a hydroxyl functionality of 3, and a hydroxyl value in the range of 20 to 40 mgKOH/g d) a block/copolymer having a hydroxyl value in the range of 25 to 45 mgKOH/g; and e) a combination of catalytic and stabilising additives.

2: The formulation according to claim 1, wherein the proportion of component (a) is 5 to 45% by weight, based on the polyol component.

3: The formulation according to claim 1, wherein the proportion of component (b) is 0 to 55% by weight, based on the polyol component.

4: The formulation according to claim 1, wherein the proportion of component (c) is 40 to 95% by weight, based on the polyol component.

5: The formulation according to claim 1, wherein the proportion of component (d) is 2 to 10% by weight, based on the polyol component.

6: The formulation according to claim 1, wherein the polyesterdiol is CNSL-based.

7: The formulation according to claim 1, wherein the polyether polyol of component (b) and/or component (c) is derived from glycerol.

8: The formulation according to claim 1, wherein the block/copolymer of ethylene oxide and/or pro pylene oxide is based on gycerol.

9: The formulation according to claim 1, wherein the catalytically active additives comprise at least one reactive (hydrogen azide) group.

10: A process for the production of soft-elastic and visco-elastic moulded foams, said process comprising providing a mixture of A) a (poly)-isocyanate, B) a formulation according to claim 1, C) water, and D) one or more catalysts; and E) reacting components A)-D).

11: The process according to claim 10, wherein component A) comprises diphenylmethane diisocyanate or a prepolymer based on MDI with an NCO content in a range of 22 to 33% is used.

12: The process according to claim 10, wherein component A) comprises diphenylmethane diisocyanate (MDI) having an MDI index in a range from 50 to 100.

13: A viscoelastic foam obtainable by reaction injection moulding, casting or as a slabstock foam of the formulation according to claim 1.

14: The viscoelastic foam of claim 13, formed as a molded part.

15: The molded part according to claim 14, in the form of sound insulation.

16: The process according to claim 11, wherein the MDI has a NCO content in the range of 28 to 32%.

Description

EXAMPLE 1

[0046] Example of embodiment of highly viscoelastic moulded flexible foam according to the present invention (quantities in parts by weight).

[0047] Polyol component (Flybrid formulation)

TABLE-US-00002 Voranol ® CP6001 50 Rokopol ® V700 30 Cardolite ® NX-9203 20 Rokopol ® MI 170 5.5 Water 3.5 Tegostab ® B8736LF2 0.4 RZETA ® 1.4 Dabco ® NE300 0.4

[0048] Isocyanate component (Specflex® NS540), mixing ratio polyol:MDI=100:46, moulded density 82 kg/m.sup.3.

EXAMPLE 2

[0049] Example of an embodiment for viscoelastically modified moulded flexible foam (improved damping behaviour due to higher loss factor at the same density/avoidance of—from an acoustic point of view undesirable increase in foam hardness) in the sense of the present invention.

Polyol Component:

[0050]

TABLE-US-00003 Voranol ® CP6001 70 Cardolite ® NX-9203 30 Rokopol ® MI 170 5 Water 5 Concentrol ® STB-PU1259PF 0.3 RZETA ® 1.25 Dabco ® NE300 0.35

[0051] Isocyanate component (Specflex® NS540), mixing ratio polyol:MDI=100:53