ABSTRACT Castor oil is widely used in chemical industry as raw material for paints, coatings, lubricants and a wide variety of other products. It is an important alternative to petrochemical feedstocks for the synthesis of polyurethanes (PU), besides being cost competitive and environmentally friendly alternative. It is used as a substitute for formaldehyde adhesives to produce composites and particleboards. Higher percentages of the resin tend to cause low water absorption and dimensional changes in the panels, so it has potential to use as waterproofing of natural materials. Bottle gourd is a fruit, used worldwide by different peoples as a raw material for the production of artifacts since many thousands of years. After the drying period, the inner part of the shell acquires characteristics similar to wood and the outer shell becomes impermeable. The objective of the work is increasing the durability and extend the useful life of the bottle gourd for use in the product design by waterproofing the material with polyurethane resin derived from castor oil. Untreated samples were compared with one and two layer resin samples. For the water absorption test, reference was made to standard NBR 15316: Medium density fiberboard. The analysis of the results was made through Scanning Electron Microscopy (SEM), water absorption test and contact angle. As a result, the application of the PU resin of castor oil reduced the water absorption indexes, and the samples with two layers of resin obtained the best results.

ABSTRACT This study aimed to analyze the waterproofing MDF with different coatings. For this, a comparative study was conducted with the following coatings on MDF: Vegetable polyurethane resin on castor oil-based, acrylic lacquer and marine varnish. To carry out the research, sewed up the samples in sequence, they received the coatings, and then we performed the test water absorption. As a result, the polyurethane resin to castor oil-based coating was presented the best results, that is, lower levels of water absorption lower thickness swelling and volume. Finally, it is believed that the study of waterproofing MDF plant originated from polyurethane castor oil is beneficial because it is a renewable source of material.

Analisando-se as estruturas para cultivo protegido de hortaliças utilizadas na cidade de Santa Maria e região, constatou-se que a maioria dos produtores utilizam estruturas artesanais, muitas vezes inadequadas às suas necessidades, por falta de instalações industriais adequadas. A partir dessas informações, foi projetada uma nova estrutura para cultivo protegido, demonstrando o promissor papel do design como facilitador do desenvolvimento local.

Analyzing the structures for protected cultivation of vegetables used in the city of Santa Maria and region, it was found that most producers use artisan structures, often inappropriate to their needs, lacking of adequate industrial facilities. From this information, was designed a new structure for protected cultivation, demonstrating the promising role of design as a facilitator of local development.

En la análisis de las estructuras para cultivos protegidos de hortalizas utilizadas en la ciudad de Santa María y sus alrededores, se encontró que la mayoría de los productores utilizan las estructuras artesanales, a menudo inadecuadas a sus necesidades, la falta de adecuadas instalaciones industriales. A partir de esta información, se diseñó una nueva estructura para cultivos protegidos, lo que demuestra el papel prometedor del diseño como un facilitador del desarrollo local.

L'analyse des structures pour la culture protégée de légumes utilisés dans la ville de Santa Maria et de la région, il a été constaté que la plupart des producteurs utilisent des structures artisanales, souvent inadapté à leurs besoins, qui n'ont pas d'installations adéquates pour l'industrie. De cette information, a été conçu une nouvelle structure pour la culture protégée, ce qui démontre le rôle prometteur de la conception en tant que facilitateur du développement local.