Wood preservation products protected with a durable coating system
OwnerZiqiang Luinventor
Life of this patent
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Abstract
A crosslinking polyvinyl acetate (XPVAc or X-PVAc) adhesive is applied as a primer (i.e., a basecoat) or an exterior coat (i.e., a top coat) on a wood preservation product which is mainly treated with a water-based preservative. By sealing the exterior wood surfaces, the new coating system not only effectively prevents the leaching of the preservative by bonding and chelating with the unfixed preservative compounds or complexes at the surface layer, but it also significantly reduces surface aging of wood, maintains effective preservation functions, and provides a longer service life to the wood preservation product.
Claims10
A chemical preservative composition for wood comprising:
- a water-based biocide, selected from the group consisting of a waterborne biocide, a water-dispersible biocide, or the combination thereof;
- said composition further including a crosslinking polyvinyl acetate protective coating which may be applied to bond and seal wood surfaces;
- said crosslinking polyvinyl acetate protective coating chelating with the active water-based biocide;
- wherein the crosslinking polyvinyl acetate protective coating at least consists of a polyvinyl acetate-based adhesive resin, a crosslinking agent, and a catalyst before being cured;
- and
- wherein the protective coating has a minimum Fruehauf wet shear strength of 325 psi when applied to wood and cured.
A wood product including an exterior surface, at least a portion of said exterior surface being coated with a chemical preservative composition for wood comprising:
- a water-based biocide, selected from the group consisting of a waterborne biocide, a water-dispersible biocide, or the combination thereof;
- said biocide including a copper-, chromium-, arsenic-, zinc-, tin-, or titanium-based compound or complex, a boron-, nitrogen-, sulfur-, chloride-, phosphate-, or silicate-based compound or complex, or the combination thereof;
- said composition further including a crosslinking polyvinyl acetate protective coating to bond and seal wood surfaces;
- said crosslinking polyvinyl acetate protective coating chelating with the active water-based biocide;
- wherein the crosslinking polyvinyl acetate protective coating includes a crosslinking agent and a catalyst before being cured;
- and wherein the protective coating has a minimum Fruehauf wet shear strength of 325 psi when applied to wood and cured.
A method for protecting a wood product having an exterior surface, comprising the steps of:
- a) coating at least a portion of said exterior surface of said wood product with a chemical preservative composition for wood comprising a water-based biocide, selected from the group consisting of a waterborne biocide, a water-dispersible biocide, or the combination thereof;
- said composition further including a crosslinking polyvinyl acetate protective coating is applied to bond and seal wood surfaces;
- said crosslinking polyvinyl acetate protective coating chelating with the active water-based biocide;
- wherein the crosslinking polyvinyl acetate protective coating includes a crosslinking agent and a catalyst before being cured;
- b) applying a second coating of the chemical preservative composition;
- and
- c) applying an acrylic or epoxy coating over the coatings.
Dependencies are inferred from the claim text.