Polyurethane foam forming composition including triglycerides, polyurethane foam made from the composition, and method of making polyurethane foam
The present disclosure relates to a method of making polyurethane foam, the method comprising providing a polyol mixture comprising polyether polyol and unmodified vegetable oil having a hydroxyl number of less than 10; and reacting isocyanate with the polyol mixture to form a polyurethane foam, wherein the unmodified vegetable oil does not react and does not form part of the polyurethane foam. The present disclosure also relates to polyurethane formed by the method and polyurethane compositions.
1. A method of making polyurethane foam, the method comprising:
providing a polyol mixture comprising polyether polyols and unmodified vegetable oil having a hydroxyl number of less than 10; and
reacting isocyanate with the polyol mixture to form a polyurethane foam, wherein the unmodified vegetable oil does not react with the polyether polyols or the isocyanate,
wherein the isocyanate comprises 1,1′-methylenebis(isocyanatobenzene) and is provided in an amount of 50-100 parts by weight per 100 parts by weight of the polyol mixture, the unmodified vegetable oil comprises soybean oil, and the polyol mixture comprises:
Parts by weight
per 100 parts by
Component
weight
Polyether polyols
85-98
Soy polyols
0
Crosslinker
0-5
Surfactant
0-2
Catalysts
0.1-1
Water
2-6
Soybean oil
0.1-25.
2. The method of claim 1 wherein the unmodified vegetable oil has a hydroxyl number of 1 to 9.
3. The method of claim 1 wherein the unmodified vegetable oil has a hydroxyl number of 2 to 3.
4. The method of claim 1 wherein the unmodified vegetable oil has a hydroxyl number of 0.
5. A method for forming a polyurethane foam, the method comprising:
reacting a polyol composition with isocyanate to form a flexible polyurethane, the polyol composition comprising polyether polyols and unmodified vegetable oil having a hydroxyl number of less than 10
wherein the unmodified vegetable oil does not react during the reaction with the polyol or the isocyanate,
wherein the isocyanate comprises 1,1′-methylenebis(isocyanatobenzene) and is provided in an amount of 50-100 parts by weight per 100 parts by weight of the polyol composition, the unmodified vegetable oil comprises soybean oil, and the polyol composition comprises:
Parts by weight
per 100 parts by
Component
weight
Polyether polyols
85-98
Soy polyols
0
Crosslinker
0-5
Surfactant
0-2
Catalysts
0.1-1
Water
2-6
Soybean oil
0.1-25.
6. The method of claim 5 wherein the unmodified vegetable oil has a hydroxyl number of 1 to 9.
7. The method of claim 5 wherein the unmodified vegetable oil has a hydroxyl number of less than 5.
8. The method of claim 5 wherein the polyurethane foam has a compression set of 10% to 15% as measured according to ASTM D-3754.
9. A low compression set polyurethane foam comprising the reaction product of:
a polyol composition comprising polyether polyols and unmodified vegetable oil, the unmodified vegetable oil having a hydroxyl number of less than 10 per 100 parts by weight of the polyol composition; and
an isocyanate,
wherein the isocyanate comprises 1,1′-methylenebis(isocyanatobenzene) and is provided in an amount of 55-75 parts by weight per 100 parts by weight of the polyol composition, the unmodified vegetable oil comprises soybean oil, and the polyol composition comprises:
Parts by weight
per 100 parts by
Component
weight
Polyether polyols
88-95
Soy polyols
0
Crosslinker
.5-4
Surfactant
0.3-1
Catalysts
0.2-0.8
Water
3-5
Soybean oil
2-15.
wherein the polyurethane foam has a compression set of less than 18% when measured according to ASTM D-3574 at 75% dry compression set, and wherein the vegetable oil does not react during the reaction with the polyol or the isocyanate.
10. The polyurethane foam of claim 9 wherein the unmodified vegetable oil has a hydroxyl number of 1 to 10.
11. The polyurethane foam of claim 9 wherein the unmodified vegetable oil has a hydroxyl number of 0.
12. The polyurethane foam of claim 9 wherein the unmodified vegetable oil has a hydroxyl number of less than 5.
13. The polyurethane foam of claim 12 wherein the soybean oil is consumer grade soybean oil.