Method for providing substrate coated with a cured damping coating and coated substrate so provided

Abstract

A method for providing a substrate coated with a cured damping coating including: applying a curable liquid damping composition to a substrate, wherein said curable liquid damping composition includes an admixture of certain Michael acceptor(s), certain Michael donor(s), a base catalyst; a rheology modifier; and a solid filler; wherein the filler is a different material than the rheology modifier; wherein the curable damping composition has a PVC of from 20% to 70%; and drying/curing the applied curable damping composition at a temperature of from 0° C. to 250° C. is provided. Also provided is a substrate coated with the cured damping coating.

Claims

1. A method for providing a substrate coated with a cured damping coating comprising: (a) applying a curable liquid damping composition to a substrate, wherein said curable liquid damping composition comprises an admixture of: one or more oligomeric multifunctional (meth)acrylate Michael acceptors; one or more oligomeric multifunctional Michael donors selected from the group consisting of acetoacetate compounds, cyanoacetate compounds, acetoacetamide compounds, and cyanoacetamide compounds; from 0.001 to 1.0 moles of a base catalyst per equivalent of multifunctional Michael donor(s); from 0.1% to 10% rheology modifier by wt. based on the wt. of said liquid damping composition; and a solid filler; wherein the filler is a different material than the rheology modifier; wherein the ratio of the equivalents of said one or more oligomeric multifunctional Michael acceptor(s) to the equivalents of said one or more oligomeric multifunctional Michael donor(s) is from 0.3 to 3.0; and wherein said curable damping composition has a pigment volume concentration of from 20% to 70%; and (b) drying/curing said applied curable damping composition at a temperature of from 0° C. to 250° C. to provide said substrate coated with said cured damping coating.

2. The method of claim 1 wherein said curable liquid damping composition has a pigment volume concentration of from 45% to 65%.

3. The method of claim 1 wherein the ratio of the equivalents of said one or more oligomeric multifunctional Michael acceptor(s) to the equivalents of said one or more oligomeric multifunctional Michael donor(s) is from 0.75 to 1.25.

4. A substrate coated with said cured damping coating formed by the method of claim 1.

5. The coated substrate of claim 4 wherein said cured damping coating is a single coat having a dried/cured thickness of from 2 mm to 6 mm.

Description

EXAMPLE 1. FORMATION OF CURABLE DAMPING COMPOSITION

(1) The composition was prepared in two components as follows. Component 1A: Michael acceptor: 5.75 g SR601, 5.75 g SR602, 0.5 g SR444; 25 g toluene (Sigma-Aldrich); and 54.4 g CaCO3 (filler; TITAN™-200) were added to a container and mixed using an air powered mixer with a Teflon 3-paddle blade for 10 minutes. 0.1 g TMG catalyst was added, and again mixed for 10 minutes. Finally, 3 g CLAYTONE™ AF (BYK) rheology modifier was added and again mixed for 10 minutes. Component 1B: Michael donor: 2.46 g MeAcAc; 4 g toluene; and 10 g CaCO3 (TITAN™-200) were added to a container and mixed using an air powered mixer with a Teflon 3-paddle blade for 10 minutes. The two components were blended together and fully mixed with the air-powered mixer before use. The baked sample was baked at 150 C for 30 minutes prior to testing.

COMPARATIVE EXAMPLE A. FORMATION OF COMPARATIVE DAMPING COMPOSITION

(2) 100 g of PARALOID™ B-72 (Acrylic thermoplastic resin with Tg of 40° C. and weight average molecular weight of 105K, 50% in toluene) and 9.6 g toluene were added to a glass bottle and mixed using an air powered mixer with a Teflon 3-paddle blade. 225 g TITAN™-200 filler was slowly added under mixing, and mixed for 15 minutes. The coating was thickened with 2.5 g of CLAYTONE™ AF (BYK) rheology modifier and mixed for an additional 15 minutes. The composition was then heated in an oven at 150° C. for 30 minutes prior to testing.

COMPARATIVE EXAMPLE B. FORMATION OF COMPARATIVE DAMPING COMPOSITION

(3) 80 g acrylic latex (with Tg of 0° C., 50% solids in water), 0.5 g BYK-093, 0.32 g BAYFERROX™ 318M, 125 g TITAN™-200 (Omya), 0.3 g EXPANCEL™ 031WUFX40, and 4 g KOLLOTEX™ 1500 (AVEBE GmbH) were mixed together for 15 minutes using a standard overheard mixer. 0.4 g of ACRYSOL™ RM12-W was added under further mixing. Coating is formed then heated in oven at 150° C. for 30 minutes prior to testing.

EXAMPLE 2. FORMATION OF CURABLE DAMPING COMPOSITION

(4) The composition was prepared in two components as follows. Component A: Michael acceptor, 5.75 g SR601, 5.75 g SR602, 0.5 g SR444, and 24 g CaCO3 (TITAN™-200) were added to a container and mixed using an air powered mixer with a Teflon 3-paddle blade for 10 minutes. 0.1 g TMG was added, and again mixed for 10 minutes. Finally, 2 g CLAYTONE™ AF was added and again mixed for 10 minutes. Component B: Michael donor, 2.46 g MeAcAc, and 7 g CaCO3 (TITAN™-200) were added to a container and mixed using an air powered mixer with a Teflon 3-paddle blade for 10 minutes. The two components were blended together and fully mixed with the air-powered mixer before use.

COMPARATIVE EXAMPLE C. FORMATION OF COMPARATIVE DAMPING COMPOSITION

(5) The composition was prepared in two components as follows. Component 1: Michael acceptors, 5.75 g SR601, 5.75 g SR602, 0.5 g SR444, and 27 g CaCO3 (TITAN™-200) were added to a container and mixed using an air powered mixer with a Teflon 3-paddle blade for 10 minutes. 2 g CLAYTONE™ AF was added and again mixed for 10 minutes. Component 2: Michael donor, 1.296 g triethylene tetramine, and 3 g CaCO3 (TITAN™-200) were added to a container and mixed using an air powered mixer with a Teflon 3-paddle blade for 10 minutes. The two components (1:1 acceptor:donor) were blended together and fully mixed with the air-powered mixer before use.

COMPARATIVE EXAMPLE D. FORMATION OF COMPARATIVE DAMPING COMPOSITION

(6) The composition was prepared in two components as follows. Component 1: Michael acceptors, 5.75 g SR601, 5.75 g SR602, 0.5 g SR444, and 27 g CaCO3 (TITAN™-200) filler were added to a container and mixed using an air powered mixer with a Teflon 3-paddle blade for 10 minutes. 4 g CLAYTONE™ AF was added and again mixed for 10 minutes. Component 2: Michael donor, 6.178 g triethylene tetramine, and 15 g CaCO3 (TITAN™-200) were added to a container and mixed using an air powered mixer with a Teflon 3-paddle blade for 10 minutes. The two components (1:6 acceptor:donor) were blended together and fully mixed with the air-powered mixer before use.

COMPARATIVE EXAMPLE E. FORMATION OF COMPARATIVE DAMPING COMPOSITION

(7) The composition was prepared in two components as follows. Component 1: Michael acceptors, 5.75 g SR601, 5.75 g SR602, 0.5 g SR444, and 27 g CaCO3 (TITAN™-200) were added to a container and mixed using an air powered mixer with a Teflon 3-paddle blade for 10 minutes. 4 g CLAYTONE™ AF (BYK) was added and again mixed for 10 minutes. Component 2: Michael donor, 5.169 g Pentaerythritol tetrakis(3-mercaptopropionate), 0.2 g triethylenetetramine and 12 g CaCO3 (TITAN™-200) were added to a container and mixed using an air powered mixer with a Teflon 3-paddle blade for 10 minutes. The two components (1:1 acceptor:donor) were blended together and fully mixed with the air-powered mixer before use.

(8) Note: PARALOID™ and ACRYSOL™ are trademarks of The Dow Chemical Company. TITAN™ is a trademark of Omya Inc. BAYFERROX™ is a trademark of Lanxess AG. EXPANCEL™ is a trademark of AkzoNobel N.V. KOLLOTEX™ is a trademark of Avebe GmbH. CLAYTONE™ is a trademark of (BYK) Altana Group AG.

EXAMPLE 3. EVALUATION OF APPLIED DRIED/CURED DAMPING COATINGS

(9) TABLE-US-00001 TABLE 3.1 Water pickup and CLF performance WPU WPU CLF CLF Peak Avg Avg 24 hr 48 hr Peak Temp coverage thickness CLF Sample PVC (mass %) (mass %) Height (° C.) (kg/m.sup.2) (mm) Area Ex. 1 65 0.80% 1.16% 0.45 11.3 4.9 3.2 7.2 Comp. 65 0.78% 1.33% 0.17 64.3 4.1 3.5 5.3 Ex. A Comp. 65 .sup. 35% .sup. 54% 0.23 25.2 4.6 5.2 8.6 Ex. B Note: The appearance of the Example 1 coating after the water pickup test was excellent, i.e., the surface remained smooth and hard.

(10) Example 1 of the present invention provided superior or exceptional water uptake and surprisingly superior vibration damping performance (CLF height) relative to Comparative Examples A and B, representing technologies not of the present invention.

EXAMPLE 4. EVALUATION OF APPLIED DRIED/CURED DAMPING COATINGS

(11) TABLE-US-00002 TABLE 4.1 Water pickup performance WPU pH = 4 WPU pH = 4 WPU 24 hr WPU 48 hr 24 hr 48 hr Sample PVC (mass %) (mass %) (mass %) (mass %) Ex. 2 50  0.43%  0.88%  0.56% 1.2% Comp. 50 2.1% 2.9% 3.3% 4.9% Ex. C (softens) Comp. 50 Coating fell apart upon immersion in water Ex. D Comp. 50 2.5% 5.3% 5.1% 7.4% Ex. E (softens) (softens)

(12) Example 2 of the present invention provided exceptional water uptake relative to Comparative Examples C-E, not of the present invention