Sound damping compositions and methods for application and use
Sound damping compositions and methods for their application are described herein. The compositions can include a polymer, a polyacrylate rheology modifier, and a polyurethane rheology modifier. The compositions can alternatively include a polymer derived from greater than 80% of one or more monomers selected from the group consisting of butyl acrylate, 2-ethylhexyl acrylate, methyl methacrylate, methyl acrylate and ethyl acrylate and combinations thereof and greater than 0% and less than 4% of one or more functional monomers, at least one rheology modifier, and a surfactant. Also described herein are sound damping products including the compositions described herein and structures including the sound damping products. Methods for damping sound in a structure are further described herein. The methods include applying the compositions to the surface of a structure and drying the composition.
1. A sound damping composition, comprising:
47 to 70 parts by weight of a polymer;
a polyacrylate thickener; and
a polyurethane thickener,
wherein the total amount of thickeners in the composition is 2 parts by weight or less, wherein the polyacrylate thickener comprises sodium polyacrylate.
2. The composition of claim 1 , further comprising an alkaline pH buffer.
3. The composition of claim 1 , wherein the polymer comprises an acrylic polymer, a styrene-acrylic copolymer, a styrene-butadiene copolymer, a vinyl-acrylic copolymer, or a mixture thereof.
4. The composition of claim 1 , wherein the polymer is derived from at least 60% of a (meth)acrylate selected from the group consisting of butyl acrylate, 2-ethylhexyl acrylate, ethyl acrylate, methyl methacrylate, and methyl acrylate.
5. The composition of claim 4 , wherein the polymer is derived from at least 80% of a (meth)acrylate selected from the group consisting of butyl acrylate, 2-ethylhexyl acrylate, ethyl acrylate, methyl methacrylate, and methyl acrylate.
6. The polymer of claim 1 , wherein the polymer is further derived from one or more functional monomers, the one or more functional monomers including acrylic acid, methacrylic acid, vinylsulfonic acid, itaconic acid, hydroxyethyl (meth)acrylate, hydroxypropyl (meth)acrylate, diacetone acrylamide or mixtures thereof.
7. The composition of claim 1 , wherein the polymer is further derived from styrene.
8. The composition of claim 1 , wherein the polymer is further derived from (meth)acrylonitrile.
9. The composition of claim 1 , wherein the polymer is further derived from vinyl acetate.
10. The composition of claim 1 , wherein the polyacrylate thickener comprises a sodium polyacrylate thickener.
11. The composition of claim 1 , further comprising a surfactant, wherein the surfactant comprises an alcohol alkoxylate.
12. A sound damping composition, comprising:
47 to 70 parts by weight of a polymer;
a polyacrylate thickener; and
a polyurethane thickener;
a surfactant comprises a C 9 -C 16 alkyl alcohol alkoxylated,
wherein the total amount of theology thickeners in the composition is 2 parts by weight or less.
13. The composition of claim 12 , wherein the surfactant includes from 5-12 ethylene oxide units.
14. The composition of claim 1 , wherein the T g of the polymer is from −10° C. to −50° C.
15. The composition of claim 1 , further comprising water to form a polymer dispersion.
16. The composition of claim 1 , further comprising a coalescing agent.
17. The composition of claim 1 , further comprising a filler that attenuates sound.
18. The composition of claim 17 , wherein the filler comprises mica, calcium carbonate, or mixtures thereof.
19. The composition of claim 1 , wherein the viscosity of the composition at 23° C. is from 7000 cP to 15,000 cP.
20. A sound damping product comprising the composition of claim 1 , wherein the sound damping product comprises an adhesive, a coating, a caulk, or a sealant.
21. A structure, comprising the sound damping product of claim 20 .
22. A method for damping sound in a structure, comprising:
applying a composition comprising 47 to 70 parts by weight of a polymer, a polyacrylate thickener, and a polyurethane thickener to the surface of the structure, wherein the total amount of thickeners in the composition is less than 10% by weight based on the total weight of the composition; and
drying the composition, wherein the polyacrylate thickener comprises sodium polyacrylate.
23. A sound damping composition, comprising:
a polymer derived from greater than 80% of one or more monomers selected from the group consisting of butyl acrylate, 2-ethylhexyl acrylate, methyl methacrylate, methyl acrylate, ethyl acrylate, and combinations thereof and greater than 0% to less than 4% of one or more functional monomers;
at least one thickener to increase the viscosity of the composition, wherein the at least one thickener is present in an amount of less than 10% by weight based on the total weight of the composition and includes a polyacrylate thickener; and
a surfactant, wherein the polyacrylate thickener comprises sodium polyacrylate.
24. The composition of claim 23 , wherein the thickener further includes a polyurethane thickener.
25. The composition of claim 1 , wherein the composition comprises
0.1 to 1.0 part by weight of the polyacrylate thickener; and
0.1 to 1.0 part by weight of the polyurethane thickener.
26. A sound damping composition, comprising:
47 to 70 parts by weight of a polymer derived from greater than 80% of one or more monomers selected from the group consisting of butyl acrylate, 2-ethylhexyl acrylate, methyl acrylate, ethyl acrylate, vinyl acetate, and combinations thereof and greater than 0% to less than 10% of one or more monomers selected from (meth)acrylonitrile, methacrylic acid, acrylic acid, vinylsulfonic acid, itaconic acid, hydroxyethyl(meth)acrylate, hydroxypropyl(meth)acrylate, diacetone-acrylamide, and combinations thereof, wherein the polymer has a T g of from −10° C. to −50° C. ;
a polyacrylate thickener;
a polyurethane thickener, and
a surfactant;
wherein the total amount of thickeners in the composition is 2 parts by weight or less, and
wherein the viscosity of the composition is from 7,000 cP to 15,000 cP at a temperature of 23° C., wherein the polyacrylate thickener comprises sodium polyacrylate.