Wax-biocide wood treatment
View Patent ↗A method for preserving wood by contacting wood with an aqueous composition comprising a paraffin wax, at least one nonionic surfactant, and at least one organic wood preservative.
1. A method for preserving wood; said method comprising contacting wood with an aqueous composition comprising:
(a) a paraffin wax having a melting point from 45 to 75° C., and an average particle size no greater than 1 micron;
(b) at least one nonionic surfactant; and
(c) at least one organic wood preservative.
2. The method of claim 1 in which the average particle size is no greater than 120 nm.
3. The method of claim 2 in which said at least one organic wood preservative is a halogenated 3-isothiazolone biocide.
4. The method of claim 3 in which the halogenated 3-isothiazolone biocide is 4,5-dichloro-2-n-octyl-4-isothiazolin-3-one.
5. The method of claim 4 in which the paraffin wax has a melting point no greater than 56° C.
6. The method of claim 5 in which the composition comprises 0.5% to 5% paraffin wax, and 400 ppm to 4000 ppm 4,5-dichloro-2-n-octyl-4-isothiazolin-3-one.
7. The method of claim 6 in which the paraffin wax has an average particle size no greater than 110 nm.
8. The method of claim 1 in which said at least one organic wood preservative is selected from the group consisting of halogenated 3-isothiazolone biocides, 3-iodopropargyl n-butyl carbamate, propiconazole, tebuconazole, bethoxazin and non-halogenated 3-isothiazolone biocides.
9. The method of claim 8 in which the paraffin wax has a melting point no greater than 56° C.
10. The method of claim 9 in which the average particle size is no greater than 120 nm.
11. The method of claim 10 in which said at least one nonionic surfactant has ethylene oxide content from 3-7 moles.