Description
Cardanol also known as Cashew Phenol is obtained in the distillation process of technical CNSL under reduced pressure. The distillation takes place at high temperature and Distilled CNSL vapours are received through high vacuum. The average unsaturation of about two double bonds in the side chain of the Cardanol molecules make cross linking easy and provides a satisfactory gradual drying and baking properties to paints prepared from it. Because of its peculiar structure Cardanol Varnishes have high electric Insulation, greater resistance to water, chemicals and good flexibility.
Cardanol is a phenol which has a C15 unsaturated alkyl chain with 1-3 double bonds at meta position. The component of commercial Cardanol differs in the degree of unsaturation of the side chain but for the practical purposes it can be represented by the following formula.
C6H4(OH)-(CH2)7-CH=CH-CH2-CH=CH(CH2)2 -CH3
Specifications of Cardanol
Appearance |
Water White |
Pale Straw Yellow |
Color on Gardner Scale |
Max 6 |
Min 8 |
Specific Gravity @ 30 Degree Celsius |
0.92+-0.01 |
0.93+-0.01 |
Viscosity CPS |
Max 45 |
Max 65 |
Viscosity @ 30 Degree Celsius Sec bt f4 CUP |
21+-1 |
25+2 |
Ash Content % |
NIL |
NIL |
Volatiles at 163 Degree Celsius |
Max 1.0 |
Max 1.0 |
Acid Value mg KOH/g |
Max 3.0 |
Max 5.0 |
Iodine Value (wiz’s method) |
200+-20 |
200+-20 |
Polymerization time in Mins |
Max 12 |
Max 10 |
Boiling point Degree celcius @ VAC.3 to 5 TORR |
215-218 |
225-230 |
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