Aqueous cold-cure flexible stabilizer formulations
View Patent ↗Aqueous cold-cure flexible foam stabilizer including the following components: a) from ≧0.1 to ≦80% by weight of at least one water-insoluble polysiloxane compound having a molecular weight of from ≧300 g/mol to ≦10 000 g/mol, b) ≧2% by weight of water, c) ≧0.1% by weight of surfactant, d) from ≧0 to 10% by weight of additives selected from the group consisting of thickeners, antifreezes, organic solvents and biocides, e) ≧0% by weight of water-soluble siloxane(s), with the proportion by weight of the abovementioned components being selected so that the sum of the proportions by weight of the components is not more than 100% by weight, based on the aqueous cold-cure flexible foam stabilizer formulation.
1. A cold-cure flexible polyurethane foam obtained from reacting polyols with isocyanates using a foam activator blend, wherein said foam activator blend comprises:
from ≧2 to ≦25% by weight, of an aqueous stabilizer formulation,
from ≧1 to ≦20% by weight of a catalyst,
from ≧1 to ≦90% by weight of a blowing agent,
from ≧1 to ≦5 90% by weight, of at least one of a flame retardant, UV stabilizer, a dye, another biocide, a pigment, a cell opener, a crosslinker and a foam-stabilizing substance, with the proportion by weight of the above-mentioned components being selected so that the sum of the proportions by weight of the components is 100% by weight, based on the foam activator blend, and wherein said aqueous stabilizer formulation consists essentially of:
a) from ≧0.1 to ≦80% by weight of at least one water-insoluble polysiloxane compound having a molecular weight of from ≧300 g/mol to ≦10 000 g/mol, wherein said at least one water-insoluble polysiloxane compound is of general formula (I):
where the radicals
R of formula (I) are each methyl,
the radicals
R 1 of formula (I) are each equal to R,
n of formula (I) is from ≧0 to 50,
m of formula (I) is from ≧0 to 50,
k is from ≧0 to 10, with the proviso that n+m of formula (I) ≧2 and n+m of formula (I) ≦70,
or of general formula III:
where the radicals
R of formula (III) are methyl,
the radicals
R 1 of formula (III) are each R,
n of formula (III) is from ≧2 to 30,
m of formula (III) is from ≧0 to ≦5,
b) 2% by weight of water,
c) 0.1% by weight of surfactant, wherein said surfactant is other than a water-insoluble polysiloxane compound or a water-soluble siloxane,
d) from ≧0 to 10% by weight of additives selected from the group consisting of thickeners, antifreezes, organic solvents and biocides, and
e) ≧0% by weight of water-soluble siloxane(s), with the proportion by weight of components a)-e) selected so that the sum of the proportions by weight of the components is not more than 100% by weight, based on the aqueous stabilizer formulation.
2. The cold-cure flexible polyurethane foam as claimed in claim 1 , wherein said at least one water-insoluble polysiloxane compound has a molecular weight of ≧10 000 g/mol and is of said general formula I.
3. The cold-cure flexible polyurethane foam as claimed in claim 1 ,
wherein, in formula (I),
n is from 1 to 50,
m is from ≧1 to 20, and
k is from ≧1 to 10.
4. The cold-cure flexible polyurethane foam as claimed in claim 1 , wherein said water is present in an amount from 2 to 99%, said surfactant is present in an amount from 0.1 to 90% by weight, said additive is present in an amount from ≧0 to 10% by weight, and said water-soluble siloxane(s) is present in an amount from ≧0 to 80% by weight.
5. The cold-cure flexible polyurethane foam as claimed in claim 1 , wherein the water-insoluble polysiloxane compound has said formula III.
6. The cold-cure flexible polyurethane foam as claimed in claim 1 , wherein a ratio (Q) of a proportion by mass of the surfactants used to the proportion by mass of the water-insoluble siloxanes in the aqueous stabilizer formulation is in the range 0<Q≦1.
7. The cold-cure flexible polyurethane foam as claimed in claim 1 , wherein the water-insoluble polysiloxanes have a molecular weight of from 300 to 4000 g/mol.
8. The cold-cure flexible polyurethane foam as claimed in claim 1 , wherein the water-insoluble polysiloxane compound has a maximum of 70 Si atoms.
9. The cold-cure flexible polyurethane foam as claimed in claim 1 , wherein the water-insoluble polysiloxane has m=0 with a viscosity of from ≧0 to ≦100 mPas.
10. The cold-cure flexible polyurethane foam as claimed in claim 1 , wherein the surfactant is a water-soluble surfactant selected from the group consisting of anionic surfactants, cationic surfactants, nonionic surfactants and amphoteric surfactants.
11. The cold-cure flexible polyurethane foam as claimed in claim 1 , wherein said cold-cure flexible polyurethane foam is an elastic cold-cure flexible polyurethane foam.
12. A method of forming a cold-cure flexible polyurethane foam, the method comprising:
reacting polyols with isocyanates in the presence of an activator blend, said activator blend comprising:
from ≧2 to ≦5 25% by weight, of an aqueous stabilizer formulation,
from ≧1 to ≦20% by weight of a catalyst,
from ≧1 to ≦90% by weight of a blowing agent,
from ≧1 to ≦90% by weight, of at least one of a flame retardant, UV stabilizer, a dye, another biocide, a pigment, a cell opener, a crosslinker and a foam-stabilizing substance, with the proportion by weight of the above-mentioned components being selected so that the sum of the proportions by weight of the components is 100% by weight, based on the foam activator blend, and wherein said aqueous stabilizer formulation consists essentially of:
a) from ≧0.1 to ≦80% by weight of at least one water-insoluble polysiloxane compound having a molecular weight of from ≧300 g/mol to ≦10 000 g/mol, wherein said at least one water-insoluble polysiloxane compound is of general formula (I):
where the radicals
R of formula (I) are each methyl,
the radicals
R 1 of formula (I) are each equal to R,
n of formula (I) is from ≧0 to 50,
m of formula (I) is from ≧0 to 50,
k is from ≧0 to 10, with the proviso that n+m of formula (I) ≧2 and n+m of formula (I) ≦70,
or of general formula III:
where the radicals
R of formula (III) are methyl,
the radicals
R 1 of formula (III) are each R,
n of formula (III) is from ≧2 to 30,
m of formula (Et) is from ≧0 to ≦5,
b) ≧2% by weight of water,
c) ≧0.1% by weight of surfactant, wherein said surfactant is other than a water-insoluble polysiloxane compound or a water-soluble siloxane,
d) from ≧0 to 10% by weight of additives selected from the group consisting of thickeners, antifreezes, organic solvents and biocides, and
e) ≧0% by weight of water-soluble siloxane(s),
with the proportion by weight of components a)-e) are selected so that the sum of the proportions by weight of the components is not more than 100% by weight, based on the aqueous cold stabilizer formulation.