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

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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: narongrit.som@kmutt.ac.th

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a 2

Abstract .-

J

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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