Method and composition for treating wood
OwnerJin Lianginventor
Life of this patent
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Abstract
A wood preservative composition which contains poly ethylene oxide along with poly vinyl pyrrolidone is applied to wood in a four-step process. In the first step, moisture and excess resin are removed from the wood. In the second step, the preservative composition is applied to the wood by pressure injection. In the third step, the container for the wood is drained and excess solution is transferred to a holding tank. In the fourth step, a catalyst, either heat or a low-pH composition, is applied to the wood to cause chemical bonding of the preservatives within and with the wood. As a part of the fourth step, excess moisture is removed from the wood by subjecting the wood to a vacuum to draw out excess moisture and then subjecting the wood to a flow of desiccated air which absorbs the moisture.
Claims13
A method for treating wood comprising the steps of:
- first, subjecting the wood to at least one repetition of
- a step of extracting moisture from the wood followed by,
- a step of imbuing the wood with an aqueous solution having
- about 0.5 percent to about 3.0 percent by volume poly vinyl pyrrolidone,
- about 0.3 percent to about 3.0 percent by volume poly ethylene oxide, and
- about 5.0 percent to about 10.0 percent by volume glycol ether;
- next, causing said poly vinyl pyrrolidone to crosslink chains of said poly ethylene oxide and to crosslink chains of said poly ethylene oxide and cellulose of the wood;
- and
- finally, removing additional moisture from the wood.
A method for treating wood comprising the steps of:
- first, subjecting the wood to at least one repetition of
- a step of subjecting the wood to a first vacuum to extract moisture followed by,
- a step of applying to the wood at a pressure of from about
- 140 psi to about 160 psi an aqueous solution having
- from about 0.5 percent to about 3.0 percent by volume poly vinyl pyrrolidone,
- from about 0.3 percent to about 3.0 percent by volume poly ethylene oxide, and
- from about 5.0 percent to about 10.0 percent by volume glycol ether;
- next, subjecting the wood to a second vacuum to cause moisture to migrate to the outer periphery of the wood;
- next, causing said poly vinyl pyrrolidone to crosslink chains of said poly ethylene oxide and to crosslink chains of said poly ethylene oxide and cellulose of the wood;
- and
- finally, subjecting the wood to a current of desiccated air.
Dependencies are inferred from the claim text.