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Abstract:
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This research project aims at developing new applications for CNSL in the
polymer field. Cashew nut shell liquid (CNSL) is a cheap agro-byproduct and
renewable resource which consists mainly of substituted phenols. By using CNSL
in place of phenol, phenol derived from petrochemicals can be conserved and a
cheap agro-byproduct utilized.In this study CNSL based resin is prepared by condensing a mixture of
phenol and CNSL with hexamethylenetetramine and the effect of P: F ratio and
CNSL: P ratio on the properties of synthesized resin is studied. The adhesive
properties of CNSL based resin in combination with neoprene rubber are
investigated. The effect of varying the stoichiometric ratios between total phenol
and formaldehyde and CNSL and phenol of the resin, resin content, choice and
extent of fillers and adhesion promoters in the adhesive formulation are studied.
The effect of resin on the ageing properties of various elastomers is also studied by
following changes in tensile strength, elongation at break, modulus, tear strength,
swelling index and acetone soluble matter. Crude CNSL and resins with different
P: F ratios and CNSL: P ratios are incorporated into elastomers. Lastly, utility of
CNSL based resin as binder for making particleboard is investigated.The results show that CNSL based resin is an effective ingredient in
adhesives for bonding aluminium to aluminium. The resin used for adhesive
fonnulation gives the best performance at 45 to 55 phr resin and a total phenol:
formaldehyde of l:2.9. The resin when added at a rate of l5 phr improves ageing
characteristics of elastomers with respect to mechanical properties. The reaction
mixture of CNSL and hexa and the resin resulting from the condensation of CN SL,
phenol and hexa can be used as effective binders for moulding particleboard. |