Granted Patent B2

US 9,315,688 · App. 13/639,695 · Granted Apr 19, 2016

Abstract

Claims (37)

1. A method for sealing a wood substrate, comprising:

(1) applying an aqueous sealant system onto at least a part of the surface of the wood substrate, wherein the wood substrate comprises has a tannin content of not lower than 5% and up to 30%, relative to the total content of extractable solids in the wood, and wherein the aqueous sealant system comprises:

a) a film-forming resin composition comprising an aqueous latex of an active hydrogen-containing polymer, a filter, and optional additives, wherein the active-hydrogen-containing polymer comprises one or more of a vinyl acetate-ethylene copolymer, a vinyl acetate-ethylene-(meth)acrylate copolymer, a vinyl acetate-(meth)acrylate copolymer, polyvinyl acetate, or polyvinyl alchohol; and

b) a multi-isocyanate hardener,

wherein the ratio by weight of component a) to component b) is 100:3 to 100:10; and

(2) drying the aqueous sealant system to form a seal coating on the surface of the wood substrate, wherein the seal coating prevents migration of tannins in the wood to the surface of the wood substrate.

2. The method according to claim 1 , further comprising applying a topcoat on the seal coating.

3. The method according to claim 1 , wherein the wood is selected from the group consisting of oak, chestnut, cherry, basswood, cedar, teak, rosewood, redwood, Korean pine and scarred wood.

4. The method according to claim 1 , wherein component a) comprises, based on the total weight of component a),

20 to 55% by weight of the aqueous latex of the active hydrogen-containing polymer;

20 to 70% by weight of the filler; and

0 to 25% by weight of an additional additive, wherein the additive comprises one or more of wetting and dispersing agents, defoamers, thickeners, and pigments.

5. The method according to claim 4 , wherein component a) comprises, based on the total weight of the component a),

35 to 55% by weight of the aqueous latex of active hydrogen-containing polymer;

40 to 65% by weight of the filler; and

0.3 to 15% by weight of the additional additives.

6. The method according to claim 4 , wherein the wetting and dispersing agent comprises one or more of an ionic wetting and dispersing agent, a non-ionic wetting and dispersing agent, and a multifunctional wetting and dispersing agent.

7. The method according to claim 4 , wherein the defoamer further comprises one or more of an organic siloxane defoamer, and a polyether modified organic silicone defoamer.

8. The method according to claim 4 , wherein the thickener comprises one or more of polyurethane thickener and a cellulose ether thickener.

9. The method according to claim 4 , wherein the pigment comprises one or more of iron oxides, carbon black, lead oxides, lead carbonates, zinc oxide, titanium oxide, ultra-marine blue, chrome green, and chromium oxide.

10. The method according to claim 4 , wherein component a) comprises, based on the total weight of component a),

20 to 50% by weight of the aqueous latex of the active hydrogen-containing polymer;

40 to 65% by weight of the filler;

0.3 to 0.5% by weight of the wetting and dispersing agent;

0.3 to 0.6% by weight of the defoamer;

0.5 to 1.5% by weight of the thickener; and

0 to 15% by weight of the pigment.

11. The method according to claim 10 , further comprising, based on the total weight of component a),

1 to 3% by weight of an antifreeze agent;

0.1 to 0.3% by weight of a bactericide;

0.1 to 0.3% by weight of a biocide; and

0.1 to 0.3% by weight of pH adjuster.

12. The method according to claim 1 , wherein the aqueous latex of the active hydrogen-containing polymer has a solid content in the range of 45% to 60% based on the weight of the polymer to the combination of the polymer plus water, and a pH value in the range of 4.2-8.0.

13. The method according to claim 1 , wherein component b) comprises one or more of aliphatic multi-isocyanate, or aromatic multi-isocyanate, or any combination thereof.

14. The method according to claim 13 , wherein component b) comprises one or more of hexamethylene diisocyanate, dodecamethylene diisocyanate, cyclohexene-1,4-diisocyanate, 4,4′-dicyclohexene methane diisocyanate, cyclopentene-1,3-diisocyanate, p-phenylene diisocyanate, toluene-2,4-diisocyanate, naphthalene-1,4-diisocyanate, diphenyl-4,4′-diisocyanate, benzene-1,2,4-triisocyanate, xylylene-1,4-diisocyanate, xylylene-1,3-diisocyanate, diphenylene methane diisocyanate, butane-1,2,3-triisocyanate, polymethylene polyphenyl isocyanate, polyurethane based prepolymer thereof, polyester based prepolymer thereof, or polyether based prepolymer thereof, or any combination thereof.

15. The method according to claim 13 , wherein component b) comprises one or more of diphenyl methane diisocyanate monomer, polyether based diphenyl methane diisocyanate prepolymer, or polyester based diphenyl methane diisocyanate prepolymer, or any combination thereof.

16. The method according to claim 1 , wherein the filler comprises one or more of talc, calcium carbonate, barium sulfate, magnesium aluminum silicate, and silica.

Assignments (9)