A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Durable Systems for wooden window frames
Early failures often occur on wooden window frames, which have been coated with water borne primer and topcoat. To improve the properties of the coated wood at an early stage of drying a system was developed, in which a small amount of aliphatic HDI-type diisocyanate is added to the primer. Improved wet adhesion, resistance to high water vapour pressure and less water ingress through surface imperfections - all typical early failures - are obtained by the use of diisocyanate-enriched primer. These tests were performed with a two-coat system to show the influence of the addition of isocyanate on the systen, i.e. whether the isocyanate is capable of a reaction between the primer and the wood or only with the primer. The isocyanate-enriched primer is made suitable for continuous application techniques such as flowcoating. Fresh primer is added to the flowcoater along with isocyanate depending on the reaction rate and rate of paint consumption. This results in a steady state, which distinguishes the isocyanate-enriched primers from the two-component primers. The process of continuous application is modified to enable the use of an isocyanate-enriched primer. By better process control, e.g. automatic dosing of the isocyanate the performance of the coating system is optimised (e.g. being certain the correct quantily of isocyanate is added) and the handling of the isocyanate is minimised. The system is viable for opaque and transparent primers in a two or three-coat system.
Durable Systems for wooden window frames
Early failures often occur on wooden window frames, which have been coated with water borne primer and topcoat. To improve the properties of the coated wood at an early stage of drying a system was developed, in which a small amount of aliphatic HDI-type diisocyanate is added to the primer. Improved wet adhesion, resistance to high water vapour pressure and less water ingress through surface imperfections - all typical early failures - are obtained by the use of diisocyanate-enriched primer. These tests were performed with a two-coat system to show the influence of the addition of isocyanate on the systen, i.e. whether the isocyanate is capable of a reaction between the primer and the wood or only with the primer. The isocyanate-enriched primer is made suitable for continuous application techniques such as flowcoating. Fresh primer is added to the flowcoater along with isocyanate depending on the reaction rate and rate of paint consumption. This results in a steady state, which distinguishes the isocyanate-enriched primers from the two-component primers. The process of continuous application is modified to enable the use of an isocyanate-enriched primer. By better process control, e.g. automatic dosing of the isocyanate the performance of the coating system is optimised (e.g. being certain the correct quantily of isocyanate is added) and the handling of the isocyanate is minimised. The system is viable for opaque and transparent primers in a two or three-coat system.
Durable Systems for wooden window frames
Dauerhafte Beschichtungssysteme für Holzfensterrahmen
Nienhuis, J.G. (author) / Akkerman, M.A.J. (author)
2000
13 Seiten, 5 Bilder, 3 Tabellen, 8 Quellen
Conference paper
English
| European Patent Office | 2015
Durable Rustic Wooden Signboards
| NTIS | 1969