Material Formations and Processing Technology of Rubber-Wood Composites for ~ u b b e r Roofs
biarongrit Sombatsompop, Ekachai Wimolmala,
Teerasak Markpin and Chatchawan kantala
nau5~an1sw~n11a:6u~dluo~1ua~ (P-PROF) a1ag~llnnTuTai5aq
nru:lua'uo~u~o~r~n~aulla.~aq um5na1~a1nnTuTailusnau1n~1ilsuq~ (uos.) uioun r j o n ~ nqolnluq I 01 40 Polymer Processing and Flow (P-PROF) Group, Division of Materials Technology, School of Energy,
Environment and Materials, King Mongkut's Unil~ersity of Technology Thonburi (KMUW. Bangmod,
Tungkru, Bangkok, 101 40, Thailand. Corresponding e-mail: [email protected]
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Abstract .-
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The research involved property development of natural rubberlwood sawdust composites for natural-rubber roofs. k?, c
This composite roof had a resistance to environment aging, UV degradation which can be practically used in the
industrial scale. This work saught the possibility of using the liquid polyurethane on ihe natural rubber roofs. The
mechanical properties, UV and weathering resistances (moisture and ozone) and thermal conductivity of the composite
roofs were studied. I t was possible to use the l iquid
polyurethane lamination on the wood-NR roofs. After
laminating the primer (C 501), then the top coat (A 602
and B 602) has been laminated by the jet spray method.
Water r u n - o f f t es t was p e r f o r m e d o n t h e l i q u i d
polyurethane-laminated sawdust-NR roofs. No de-
lamination of the PU coating from the wood/NR layers was
observed and no chemical contaminations exceeded the
limits indicated by TlSl 535-2540 for concrete roofs. More
energy savings of the NR composite roofs could be
achieved b y adding "Expancel" blowing agent. The
addition of the Expancel blowing agent reduced the
thermal conductivity (K) of the sawdust-NR composite
roofs, the K value of the expanded rubber roofs being be
0.1131 W/m0K, which was 31% lower than that of the
sol id NR composite roofs (K = 0.1637 W/mnK ). The
recommended concentration of the Expancel 009 DU 80
to be added in the NR roofs was 3 phr.
Keywords : rubber roofs, natural rubber, wood sawdust,
polyurethane coating, thermal conductivity, blowing agent
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