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Alkyd resins are usually classed as long oil, [11] medium oil and short oil. [12] These terms represent the oil length in the resin. [ 13 ] Alkyds are also modified with phenolic resin , styrene , vinyl toluene , acrylic monomers (to make them dry more quickly) and isocyanates to produce a polyurethane modified alkyd.
Moisture cured polyurethane–urea coatings have been made by reacting 1,2,3-triazole rich polyether polyols with HMDI at NCO/OH eq. ratio of 1.2 to obtain isocyanate-terminated polyurethane prepolymers. The prepolymers were cured under atmospheric moisture to make polyurethane–urea free films. [5]
Chemical staining of wood is rarely carried out because it is easier to colour wood using dye or pigmented stain, however, ammonia fuming is a chemical staining method that is still occasionally used to darken woods such as oak that contain a lot of tannins. Staining of wood is difficult to control because some parts of the wood absorb more ...
Fumed oak choir stalls at Clonfert Cathedral, Ireland. Ammonia fuming is a wood finishing process that darkens wood and brings out the grain pattern. It consists of exposing the wood to fumes from a strong aqueous solution of ammonium hydroxide which reacts with the tannins in the wood.
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Participants took cognitive tests at the start of the study, after one year, and then every two years until the end of the study. The tests measured cognition, memory, thinking and language skills ...
The interest of automakers is responsible for much of the work being done on the use of NOPs in polyurethane products for use in cars, for example is seats, [14] [15] and headrests, armrests, soundproofing, and even body panels. [16] One of the first uses for NOPs (other than castor oil) was to make spray-on polyurethane foam insulation for ...
Remember, too, that cleaning the enameled cast iron promptly after cooking and after it has cooled is essential. “Letting food sit on the skillet can lead to staining and make it harder to clean ...