MR-1树脂的研制及用于改性紫胶涂料的研究

研究了以三聚氰胺、甲醛和R—改性剂制备的醇溶性MR-1树脂和用MR-1树脂改性紫胶涂料。用MR-1树脂改性的紫胶具有优良的耐热(100℃)、耐水和耐某些有机溶剂的性能,最适于作木器家具底漆。可替代40～50％的紫胶,其价格比紫胶低廉。     

MR-1树脂制备及用MR-1树脂改性紫胶涂料研究(中间试验)

中间试验规模为小试规模的667倍(0.5吨/锅)。采用常压与减压相结合、回收丁醇直接循环使用的一步法合成工艺,验证了工艺条件的稳定性;考核了选用的生产装置的适用性和生产规模的技术、经济可行性。实验结果表明:工艺完善,设备合理,产品技术性能稳定,可代替40—50％的紫胶。改性紫胶价格仅为普通紫胶价格的60％,技术经济效益良好,可按中试规模或进一步扩大规模实施生产。     

Weathering durability of CCB-impregnated wood for clear varnish coatings

Outdoor performances of a polyurethane varnish and an alkyd-based synthetic varnish coated over chromium-copper-boron (CCB)-impregnated Scots pine (Pinus sylvestris L.) and chestnut (Castanea sativa Mill.) [10 (R) × 100 (T) × 150 (L) mm] were investigated. These varnishes were also applied to the wood surface as sole coatings or impregnated into wood as water-repellent (WR) solutions. Outdoor exposure was performed in the Black Sea region of northern Turkey (41°N, 39.43°E) where humid weather predominates throughout the year and accelerates decomposition of coated wood surfaces. The wood panels were exposed at 45° south on their tangential surfaces. After 9 months of exposure to summer, autumn, and the following winter season, the color and glossiness changes of the exposed surface, adhesion of the coating layer to the wood surface, water absorption through the coating layers, mass loss, and the hardness of the board surface were studied. CCB impregnation greatly stabilized the surface color of varnish-coated panels of both wood species. Gradual decreases of adhesion between varnished layers and preimpregnated surfaces were attributed to probable weakening of interactions at the interface of the treated wood and the film layer. A superficial cleaning process of treated wood is suggested to improve glossiness and adhesion. The coated wood surface became harder with time on outdoor exposure until a maximum hardness occurred followed by softening, whereas the uncoated surface softened steadily. Polyurethane varnish yielded a harder surface than synthetic varnish. Mass losses of wood panels after 9 months of exposure were negligible for all treatments compared with the untreated controls, which were totally discolored and eroded on the surface. It is concluded that long-term exterior wood protection has been achieved by a successful combination of an appropriate preservative treatment followed by a compatible surface-coating process.