Stock material or miscellaneous articles – Composite – Of silicon containing
Patent
1980-12-11
1983-05-31
Lusignan, Michael R.
Stock material or miscellaneous articles
Composite
Of silicon containing
427387, 427393, 428452, B05D 302, B32B 906, B32B 1504
Patent
active
043861342
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a process for the impregnation of cellulosic materials, especially wood, to improve their resistance to moisture and to increase their dimensional stability.
BACKGROUND ART
Among cellulosic materials wood is a very useful material which for its manufacture does not require large quantities of energy since it is formed in nature and since its processing is relatively simple. Wood possesses many advantages from the point of view of its use as a raw material and is thus easily machined, has a relatively high strength and good heat insulating properties, it is resistant to chemical attack etc. Wood is mostly used as a construction material for the manufacture of furniture, for domestic interior decoration and, of course, it is a highly important raw material for the building industry.
It is known that wood can decompose due to atmospheric conditions, uptake of water etc. and it is of importance to protect wood products by impregnating and/or surface treatment. Impregnation is a process whereby the pore system of the wood permanently or temporarily are filled with active substances in gas or liquid form. The surface treatment consists in the prevention of different types of surface coatings, such as paint, lacquer or the like.
A principal problem in using wood as a construction material resides in the fact that the wood by variations in moisture content is subjected to dimensional changes with disadvantageous results. Thus, fissures or cracks can form enabling transportation of moisture and spores resulting in for example attack by microorganisms. The dimensional instability can further result in damages to paint, interior decoration etc. Several attempts have been made to reduce the dimensional variations of wood due to variations in moisture content but so far with little or no success. Most of the known methods for treating wood and wood products have for a main purpose to eliminate the growth of microorganisms by the introduction of fungicides. Thus, the prior art methods have not for a main purpose to reduce or eliminate dimensional changes.
SUMMARY OF THE INVENTION
The present invention has for its purpose to provide a process for impregnation of cellulosic materials, particularly wood or wood products, to reduce or eliminate dimensional changes due to varying environmental conditions.
The present invention also relates to elimination or reduction of water uptake, thus improving the resistance to moisture attacks thereby impairing the conditions for microorganisms, such as fungi and the like.
Another object is to provide for an impregnating process whereby the treated material will be improved with regard to better adhesion to paint, resins etc.
As a result of research and experimentation it has now been found that cellulosic materials, especially wood and wood products, can be modified to obtain a significantly improved moisture resistance and dimensional stability by bringing the material into contact with an impregnating agent or composition comprising silane of the formula: ##STR2## wherein R.sub.1, R.sub.2 and R.sub.3 are same or different and are constituted by alkoxy with 1 to 6 carbon atoms, inclusive, and R.sub.4 is equal to any of R.sub.1, R.sub.2 and R.sub.3 or constituted by alkyl or cycloalkyl having 1 to 6 carbon atoms, inclusive, aryl, aralkyl or an organofunctional radical. The process of the invention is operable also by using an impregnating agent comprising a hydrolysate or hydrolysate-condensate of such silane or mixture of silanes.
It is preferred to use as an impregnating agent or composition a solution, a suspension or an emulsion of the silane or of the product derived therefrom. As a continuous phase or transport medium there may be used gases, such as air or water vapour, liquids, such as water, alcohols, such as lower alkanols with 1 to 4 carbon atoms, mixtures of water and such alcohols, light petrol, naphtha or other petroleum products, ligroin, esters, benzene, toluene, xylene, hydrocarbons and chlorinated hydrocarbons,
REFERENCES:
patent: 2758946 (1956-08-01), Spalding et al.
patent: 3258382 (1966-06-01), Vincent
patent: 3473953 (1969-10-01), Hider
patent: 4069368 (1978-01-01), Deyak et al.
patent: 4151327 (1979-04-01), Lawton
patent: 4170690 (1979-10-01), Armbruster et al.
Chemical Abstracts, vol. 83, 1975, 207810y.
Chemical Abstracts, vol. 86, 1977, 86:18236s.
F, Textiles, Paper, Cellulose, 55821B/30, 50-626-951, 8-18-1978.
Chemical Abstracts, vol. 88, 1978, 88:38889b.
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