Curable foam elastomeric compositions
A two-part curable foaming composition comprising: (A) A first part comprising: (i) an alkoxysilyl capped prepolymer; and (ii) a polyhydrogen siloxane; (iii) optionally a catalyst which accelerates both foaming and cross-linking through said alkoxysilyl groups; and (B) A second part comprising: (i) a nitrogen-containing compound having an active hydrogen; (ii) water; and (iii) optionally a catalyst which accelerates both foaming and cross-linking through said alkoxysilyl groups; provided that at least one of the parts contain a catalyst and wherein after mixing together the first and second parts a cured elastomeric foam is formed.
1. A two-part curable foaming composition comprising:
(A) A first part comprising:
(i) an alkoxysilyl capped prepolymer; and
(ii) a polyhydrogen siloxane;
(iii) optionally a catalyst which accelerates both foaming and cross-linking through alkoxysilyl groups on the alkoxysilyl capped prepolymer; and
(B) A second part comprising:
(i) a nitrogen-containing compound having an active hydrogen;
(ii) water; and
(iii) optionally a catalyst which accelerates both foaming and cross-linking through alkoxysilyl groups on the alkoxysilyl capped prepolymer;
provided that at least one of the parts contains a catalyst and wherein after mixing together the first and second parts a cured elastomeric foam is formed.
2. The two-part curable foaming composition of claim 1 , wherein the elastomeric foam is formed under temperatures greater than ambient.
3. The two-part curable foaming composition of claim 1 , wherein the first and/or second part further comprise a lubricous agent.
4. The two-part curable foaming composition of claim 3 , wherein said lubricous agent comprises a silicone/polyether surfactant.
5. The two-part curable foaming composition of claim 4 , wherein the surfactant creates a surface of the elastomeric foam.
6. The two-part curable foaming composition of claim 1 , wherein the nitrogen-containing compound is a primary or secondary amine.
7. The two-part curable foaming composition of claim 1 , wherein said catalyst is a strong Lewis base.
8. The two-part curable foaming composition of claim 1 , wherein said catalyst is an amine condensation catalyst.
9. The two-part curable foaming composition of claim 1 , wherein the catalyst is selected form the group consisting of 1,8-diazobicyclo (5,4,0)-undec-5-ene(DBU);
dibutylamine; quinuclidine, 1,4-diazabicyclo(2,2,2) octane, and combinations thereof.
10. The two-part curable foaming composition of claim 1 , wherein the alkoxysilyl capped prepolymer comprises the reaction product of a isocyanoalkylenetrialkoxy silane with a polyether diol.
11. The two-part curable foaming composition of claim 1 , wherein the alkoxysilyl capped prepolymer comprises a trimethoxysilyl capped diurethane polyether.
12. The two-part curable foaming composition of claim 10 , wherein the polyether diol comprises polypropylene oxide diol.
13. The two-part curable foaming composition of claim 1 , wherein the foaming composition further comprises fillers, plasticizers, catalysts, stabilizers, lubricants, surfactants and combinations thereof.
14. A moisture curable foaming composition comprising an alkoxysilyl capped polymer, a polyhydrogen siloxane, a nitrogen-containing compound having an active hydrogen, and water.
15. A sound and vibration dampening composition comprising the two part curable foaming composition of claim 1 .
16. A method of filling the gap between two substrate surfaces comprising:
(A) Providing a two-part curable foaming composition comprising:
(a) A first part comprising:
(i) an alkoxysilyl capped prepolymer; and
(ii) a polyhydrogen siloxane;
(iii) optionally a catalyst which accelerates both foaming and cross-linking through alkoxysilyl groups on the alkoxysilyl capped prepolymer; and
(b) A second part comprising:
(i) a nitrogen-containing compound having an active hydrogen;
(ii) water; and
(iii) optionally a catalyst which accelerates both foaming and cross-linking through alkoxysilyl groups on the alkoxysilyl capped prepolymer;
provided that at least one of the parts contains a catalyst and wherein after mixing together the first and second parts a cured elastomeric foam is formed
(A) Combining the parts in the gap between the substrates; and
(B) Permitting the composition to form a cured foam therebetween.
17. A method of making a noise and vibration dampening seal between surfaces comprising the steps of:
introducing between the surfaces a composition comprising a mixture of:
(a) A first part comprising:
(i) an alkoxysilyl capped prepolymer; and
(ii) a polyhydrogen siloxane;
(iii) optionally a catalyst which accelerates both foaming and cross-linking through alkoxysilyl groups on the alkoxysilyl capped prepolymer; and
(b) A second part comprising:
(i) a nitrogen-containing compound having an active hydrogen;
(ii) water; and
(iii) optionally a catalyst which accelerates both foaming and cross-linking through alkoxysilyl groups on the alkoxysilyl capped prepolymer;
provided that at least one of the parts contains a catalyst and wherein after mixing together the first and second parts a cured elastomeric foam is formed, permitting the composition to form a cured foam.
18. A method of manufacturing a self-lubricating, foaming composition, comprising:
(A) providing a curable composition comprising an alkoxysilyl capped prepolymer, a polyhydrogen siloxane, a nitrogen-containing compound having an active hydrogen for reaction with the polyhydrogen siloxane, water and a catalyst which accelerates both foaming and cross-linking through alkoxysilyl groups on the alkoxysilyl capped prepolymer;
(B) providing to the curable composition a silicone/polyether surfactant;
(C) dispensing the composition onto a substrate surface;
(D) exposing the composition to conditions favorable to generating a cured foam; and
(E) permitting the surfactant to migrate to the surface to provide a lubricious surface.
19. The method of claim 18 , further comprising joining a second substrate surface to the lubricious surface of the cured foam.
20. A two-part curable foaming composition comprising:
(A) A first part comprising:
(i) an alkoxysilyl capped prepolymer; and
(ii) a polyhydrogen siloxane;
(iii) optionally a catalyst which accelerates both foaming and cross-linking through alkoxysilyl groups on the alkoxysilyl capped prepolymer;
(B) A second part comprising:
(i) a nitrogen-containing compound having an active hydrogen and which accelerates both foaming and cross-linking through said alkoxysilyl groups; and
(ii) water,
wherein after mixing together the first and second parts a cured elastomeric foam is formed.
21. A two-part curable foaming composition which provides a lubricous surface comprising:
(A) A first part comprising:
(i) an alkoxysilyl capped prepolymer; and
(ii) a polyhydrogen siloxane;
(iii) optionally a catalyst which accelerates both foaming and cross-linking through alkoxysilyl groups on the alkoxysilyl capped prepolymer;
(iv) optionally, a lubricant; and
(B) A second part comprising:
(i) a nitrogen-containing compound having an active hydrogen;
(ii) water, and
(iii) optionally a catalyst which accelerates both foaming and cross-linking through alkoxysilyl groups on the alkoxysilyl capped prepolymer;
(iv) optionally, a lubricant;
provided that at least one of the parts contain a catalyst and a lubricant and wherein after mixing together the first and second parts a cured elastomeric foam is formed.