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CASHEW NUT SHELL LIQUID (CNSL)

CASHEW NUT SHELL LIQUID (CNSL) is a versatile raw material for the production of number of commercially important products specially for Surface Coatings because of its special composition. Considerable amount of work has been done with great success in various Research Laboratories and Industries both in India and Abroad for the preparation of Resins, Lacquers, Varnishes, Primers and Paints.

Products from CNSL

Polymerisation products

CNSL polymerises because of the unsaturation in the side chain of cardinal, when heated in the presence of some metals like copper, aluminium, lead or their oxides. This forms good media for paints when further cooked with drying oils.

Condensation products

Phenol Formaldehyde Resins of the Novolac or Resole types are well known. Similar reactions also take place with CNSL, but due to the presence of the long hydrocarbon chain the condensates are more flexible than the conventional Phenolic Resins. These resins can be used for Surface Coatings with or without oil modification when high chemical resistance is desired. CNSL Aldehyde condensation products have also been used for other purposes like insulating Varnishes, Moulding Powders, Brake Lining Compositions, etc.

Other Derivatives from CNSL

Other derivatives of CNSL are used in the preparation of surface-active agents by:

Sulfonation

Antioxidants

Lubricants

Bactericides, Fungicides and Disinfactant

Insecticides, Pesticides and Herbicides

Drugs

Dyestuff

 

Properties of CNSL

The physical and chemical characteristics of CNSL are as follows:

Appearance

Dark Brown Liquid

Specific Gravity @ 30C

0.92 0.96

Viscosity @ 30C

50 200 cps

Ash Content (%)

1% (Max.)

Moisture Content

2% (Max.)

Insolubles in Toluene (%)

1% (Max.)

Acid Value (mgmKOH/gm)

< 20

Hydroxyl Value (mgmKOH/gm)

170-250

Iodine Value (WIJS)

220 270

Saponification Value

18 30

Specification of CNSL

IS-840 is the BIS specification for CNSL.