Uso da palha de carnaúba em revestimento de dutos
In this work, the plant species Copernicia prunifera (Miller) H. E. Moore (carnauba), naturally occurring which prevails in the northeast region of Brazil was the subject of studies aiming its use as external coating of pipelines used in petroleum industry. The part of the plant worked were the leav...
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Formato: | Dissertação |
Idioma: | por |
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Universidade Federal do Rio Grande do Norte
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Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/17648 |
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Resumo: | In this work, the plant species Copernicia prunifera (Miller) H. E. Moore (carnauba),
naturally occurring which prevails in the northeast region of Brazil was the subject of studies
aiming its use as external coating of pipelines used in petroleum industry. The part of the
plant worked were the leaves, also called straw, which were coated with resinous material.
For this purpose, it was necessary to evaluate the effectiveness of the use of acrylic resins in
the straw carnauba coating. The properties of the untreated carnauba straw and chemically
treated with sodium hydroxide, hexane and carbon tetrachloride were investigated by ATRFTIR,
SEM and thermal analysis. The first two techniques showed that treatment with
solvents has caused major changes in the straw surface, while the thermal analysis indicated
that the sodium hydroxide caused variations in thermal stability of straw constituents. Water
absorption measurements showed that treatments have accelerated the absorption process and
the reduction of contact angle values for treated samples with solvents indicated higher
hidrophilicity of straw. The tensile tests showed lower values of elastic modulus and tensile
strength for treated samples. Furthermore, coatings using pure commercial resins A and B
as well as the formulations with clay were applied in straw and they were examined once
again through thermal analysis, water absorption measurements, contact angle and mechanical
tests. To analyze the effect of heat ageing, samples were subjected to tensile tests again in
order to assess its resistance. The results showed that the resins/clay formulations increased
thermal stability of straw, they promoted a good impermeabilization and caused significant
decrease in the values of elastic modulus and tensile strength. Evaluating the ageing effect on
the mechanical properties, it has been showed good recovery to the coated straw with the
formulations A 60 and A 80% in modulus and tensile strength values and elongation at break
values have remained very close. It is thus concluded that the carnauba straw can be used as a
coating of pipelines with significant cost savings, since there is no need for pretreatment for
its use and shows itself as a viable biotechnology alternative, contributing to the quality of
coatings material and environment preservation. |
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