Architectural unit possessing rapid deep-section cure silicone rubber component
View Patent ↗The invention relates to architectural elements possessing at least two components bonded together employing a silicone rubber composition possessing rapid development of strength and deep-section cure, which is useful for application as a bedding sealant in the manufacture of such architectural elements as window assemblies, door assemblies, structural glazing, curtainwall applications, and the like.
1. An architectural element possessing at least two components bonded together or otherwise maintained in sealing relationship to each other employing a silicone rubber composition obtained by the curing of a mixture which comprises:
a) at least one silanol-terminated diorganopolysiloxane;
b) at least one crosslinker for the silanol-terminated diorganopolysiloxane(s);
c) at least one catalyst for the crosslinking reaction in an amount of from 0.005 weight percent to 0.2 weight percent of the total composition;
d) a rapid deep-section curing amount of zinc oxide; and,
e) at least one non-ionic surfactant selected from the group consisting of polyethylene glycol, polypropylene glycol, ethoxylated castor oil, oleic acid ethoxylate, alkylphenol ethoxylates, copolymers of ethylene oxide and propylene oxide, copolymers of silicones and polyethers, copolymers of silicones, copolymers of ethylene oxide and propylene oxide and mixtures thereof in an amount ranging from about 0.1 weight percent to about 10 weight percent.
2. The architectural element of claim 1 wherein the diorganopolysiloxane polymer, component (a), is a silanol terminated diorganopolysiloxane having the formula:
M a D b D′ c
wherein a=2, b is equal to or greater than 1, c is zero or a positive integer;
M=(HO) 3-x-y R 1 x R 2 y SiO 1/2 ;
wherein x=0, 1 or 2 and y is either 0 or 1, with the proviso that x+y is less than or equal to 2, R 1 and R 2 are monovalent C 1 to C 60 hydrocarbon radicals;
D=R 3 R 4 SiO 2/2 ;
wherein R 3 and R 4 are monovalent C 1 to C 60 hydrocarbon radicals; and
D′=R 5 R 6 SiO 2/2 ;
wherein R 5 and R 6 are independently chosen monovalent C 1 to C 60 hydrocarbon radicals.
3. The architectural element of claim 1 wherein the cross-linker, component (b), possesses the general formula:
(R 7 O)(R 8 O)(R 9 O)(R 10 O)Si
where R 7 , R 8 , R 9 and R 10 are independently chosen monovalent C 1 to C 60 hydrocarbon radicals.
4. The architectural element of claim 1 wherein the crosslinker, component (b), is at least one selected from the group consisting of tetra-N-propylsilicate, tetraethylortho silicate, and methyltrimethoxysilane.
5. The architectural element of claim 1 wherein the catalyst, component (c), is a tin catalyst.
6. The architectural element of claim 5 wherein the tin catalyst is at least one selected from the group consisting of dibutyltindilaurate, dibutyltindiacetate, dibutyltindimethoxide, tinoctoate, isobutyltintriceroate, dibutyltinoxide, solubilized dibutyl tin oxide, dibutyltin bis-diisooctylphthalate, bis-tripropoxysilyl dioctyltin, dibutyltin bis-acetylacetone, silylated dibutyltin dioxide, carbomethoxyphenyl tin tris-uberate, isobutyltin triceroate, dimethyltin dibutyrate, dimethyltin di-neodecanoate, triethyltin tartarate, dibutyltin dibenzoate, tin oleate, tin naphthenate, butyltintri-2-ethylhexylhexoate, tinbutyrate, and diorganotin bis β-diketonate.
7. The architectural element of claim 1 wherein the catalyst, component (c), is a titanium compound.
8. The architectural element of claim 7 wherein the titanium compound is at least one selected from the group consisting of Di(isopropoxide)Titanium bis(ethylacetoacetate), Di(isobutoxide)Titanium bis(ethylacetoacetato), Di(n-butoxide)Titanium bis(ethylacetoacetato), 1,3-propanedioxytitanium bis(ethylacetoacetate), Titanium(triethanolaminato)isopropoxide, Bis(triethanolamino)titanium di(methyl diglycolate), Titanium diisopropoxide(bis-2,4-pentanedionate), Titanium ethoxide isopropoxide bis-(2,4-pentanedionate), Titanium bis-(2,4-pentanedionate) (2-EHA), tetra n-butyl titanate, and tetra-isopropyl titanate.
9. The architectural element of claim 8 wherein the titanium compound is Di(isopropoxide)Titanium bis(ethylacetoacetate).
10. The architectural element of claim 1 including an adhesion promoter selected from the group consisting of n-2-aminoethyl-3-aminopropyltrimethoxysilane, 1,3,5-tris(trimethoxysilylpropyl)isocyanurate, γ-aminopropyltriethoxysilane, γ-aminopropyltrimethoxysilane, aminopropyltrimethoxysilane, bis-γ-trimethoxysilylpropyl)amine, N-Phenyl-γ-aminopropyltrimethoxysilane, triaminofunctionaltrimethoxysilane, γ-aminopropylmethyldiethoxysilane, γ-aminopropylmethyldiethoxysilane, methacryloxypropyltrimethoxysilane, methylaminopropyltrimethoxysilane, γ-glycidoxypropylethyldimethoxysilane, γ-glycidoxypropyltrimethoxysilane, γ-glycidoxyethyltrimethoxysilane, β-(3,4-epoxycyclohexyl)propyltrimethoxysilane, β-(3,4-epoxycyclohexyl)ethylmethyldimethoxysilane, isocyanatopropyltriethoxysilane, isocyanatopropylmethyldimethoxysilane, β-cyanoethyltrimethoxysilane, γ-acryloxypropyltrimethoxysilane, γ-methacryloxypropylmethyldimethoxysilane, 4-amino-3,3-dimethylbutyltrimethoxysilane, n-ethyl-3-trimethoxysilyl-2-methylpropanamine, and mixtures thereof.
11. The architectural element of claim 1 including a filler selected from the group consisting of clays, nano-clays, organo-clays, ground calcium carbonate, precipitated calcium carbonate, colloidal calcium carbonate, calcium carbonate treated with compounds stearate or stearic acid; fumed silica, precipitated silica, silica gels, hydrophobized silicas, hydrophilic silica gels, crushed quartz, ground quartz, alumina, aluminum hydroxide, titanium hydroxide, clay, kaolin, bentonite montmorillonite, diatomaceous earth, iron oxide, carbon black and graphite, talc, mica, and mixtures thereof.
12. The architectural element of claim 1 wherein the diorganopolysiloxane polymer, component (a), ranges from in amount from about 5 weight percent to about 95 weight percent of the total composition.
13. The architectural element of claim 1 wherein the diorganopolysiloxane polymer, component (a), ranges from in amount from about 20 weight percent to about 85 weight percent of the total composition.
14. The architectural element of claim 1 wherein the diorganopolysiloxane polymer, component (a), ranges from in amount from about 30 weight percent to about 60 weight percent of the total composition.
15. The architectural element of claim 1 wherein the amount of the cross-linker, component (b), ranges in amount from about 0.1 weight percent to about 10 weight percent of the total composition.
16. The architectural element of claim 1 wherein the amount of the cross-linker, component (b), ranges in amount from about 0.3 weight percent to about 5 weight percent of the total composition.
17. The architectural element of claim 1 wherein the amount of the cross-linker, component (b), ranges in amount from about 0.5 weight percent to about 1.5 weight percent of the total composition.
18. The architectural element of claim 1 wherein the amount of zinc oxide, component (d), ranges in amount from about 1 to about 60 weight percent of the total composition.
19. The architectural element of claim 1 wherein the amount of zinc oxide, component (d), ranges in amount from about 2 to about 30 weight percent of the total composition.
20. The architectural element of claim 1 wherein the amount of zinc oxide, component (d), ranges in amount from about 5 to about 20 weight percent of the total composition.
21. The architectural element of claim 11 wherein the amount of filler, ranges in amount from 0 to about 90 weight percent of the total composition.
22. The architectural element of claim 10 wherein the amount of adhesion promoter ranges in amount from about 0.5 weight percent to about 20 weight percent of the total composition.
23. The architectural element of claim 1 wherein the silicone rubber composition further includes an additional component selected from the group consisting of alkyl-terminated diorganopolysiloxane, filler, UV stabilizer, antioxidant, adhesion promoter, cure accelerator, thixotropic agent, plasticizer, moisture scavenger, pigment, dye, solvent and biocide.
24. An architectural element possessing at least two components bonded together or otherwise maintained in sealing relationship to each other employing a silicone rubber composition obtained by the curing of a mixture which comprises:
a) at least one silanol-terminated diorganopolysiloxane;
b) at least one crosslinker for the silanol-terminated diorganopolysiloxane(s);
c) at least one catalyst for the crosslinking reaction in an amount of from 0.005 weight percent to 0.2 weight percent of the total composition;
d) a rapid deep-section curing amount of zinc oxide having an average particle size of from 50 to 70 nanometers; and,
e) at least one non-ionic surfactant.