| 摘要 |
The invention provides a method for increasing fire resistance in wood that comprises contacting with the wood to be treated with a copolymer base of silicone units having the general formula: (M<SUB>a</SUB>D<SUB>b</SUB>T<SUB>c</SUB>Q<SUB>d</SUB>)<SUB>x </SUB>where M is R<SUB>3</SUB>SiO<SUB>1/2</SUB>-; D is R<SUB>2</SUB>SiO-; T is RSiO<SUB>3/2</SUB>-; Q is Si(O<SUB>1/2</SUB>)<SUB>4</SUB>-; R is a generalized organic radical selected from: linear or branched hydrocarbon radicals of 1-8 carbons containing 0-1 degree of unsaturation, or phenyl, or trifluoropropyl radicals; a, b, c, d are real numbers and further provided the ratio of a/(c+d) is between 0 and 4; the ratio of b to the rest is not subject to limitation provided the final base viscosity is between 50-3500 cSt; and at least one R group of each molecule must be a hydrolysable group; and maintaining the contact for a time sufficient to establish a change in the chemical structure of the wood which is reflected in an increase in at least one measurable parameter reflecting an increase in the strength of the wood over an untreated wood from the same lot. Preferably the method further comprises mixing a cross-linking agent with the copolymer that comprises a siloxane polymer of the general formula: (M<SUB>a</SUB>D<SUB>b</SUB>T<SUB>c</SUB>Q<SUB>d</SUB>)<SUB>x </SUB>meeting the following parameters apply: the ratio of a/(c+d) is between 0 and 4; the ratio of b to the rest is not subject to limitation provided the final cross-linking agent viscosity is below 350 cSt; and R is a generalized organic radical selected from: linear or branched hydrocarbon radicals of 1-8 carbons containing 0-1 degree of unsaturation, or phenyl, or trifluoropropyl radicals and at least one R group of each molecule must be a hydrolysable group.
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