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Cashew Nut Shell Liquid (C.N.S.L.)

Raw Cashew Nut Shell Liquid (CNSL) is obtained by a cold press or solvent extraction from Cashew Nut shells. It contains approximately 70% of anacardic acid , 18% cardol, and 5% cardanol, with the remainder being made up of other phenols and less polar substances.

Technical Cashew Nut Shell Liquid (TCNSL) is obtained by further processing of the raw CNSL thru the heating process which leads to decarboxylation of the anacardic acid to form Cardanol and the typical composition of technical CNSL is approximately 52% of cardanol,10% cardol, 30% polymeric material, with the remainder being made up of other substances.

Properties

  • Low cost Phenol
  • Versatility in polymerization and chemical modification
  • Possibilities for development of high performance polymers
  • Property advantage over phenolics in certain application such as impact resistance, flexibility, faster heat dissipation etc.
  • Automobile brake lining such as Liquid Resin
  • PF Resin
  • Cashew Friction Dust (CFD)

Application

Cashew Nut Shell Liquid has innumerable applications in polymer based industries such as friction linings, paints and varnishes, laminating resins, rubber compounding resins, cashew cements, polyurethane based polymers, surfactants, epoxy resins, foundry chemicals and intermediates for chemical industry.

Industrial Coating Enamel/Paints Marine Paints Acid resistant Paints Varnishes

  • CNSL based surface coatings possess excellent gloss and surface finish with optimum levels of toughness and elasticity. It is widely known that CNSL resin is added to synthetics by paint/varnish manufacturers to control properties and to reduce cost. Its anti-microbial, acid resistant and rust proof properties are well known and have been utilized in protecting a bottom of the boat hulls. Because of its dark color, its outlets are restricted to anti corrosion primers, black enamels, marine paints.
  • CNSL is an excellent raw material for the number of anti-corrosive paint formulations
  • CNSL modified by heating in the presence of certain accelerators give stoving enamels resistant to alkali and acid solutions, mineral and fatty oils and various organic solvents.
  • Coating compositions possessing insecticidal properties are obtained by adding DDT, gammexane, etc. to CNSL or chlorinated CNSL, after treatment with formaldehyde, gums and resins and drying or semi-drying oils

Binders

  • CNSL is also used as a substitute for linseed oil in the manufacture of foundry core oil, which is used as a binder in the foundry.

Rubber

  • Used as a processing aid, which enhances the vulcanization properties. CNSL enhances the insolubility of natural rubber vulcanizates in petroleum solvents.
  • CNSL used to provide oxidative resistance to sulfur-cured natural rubber products.
  • Sulfurated CNSL is added to rubber gum stock or nitrile rubber to improve the processability, mechanical properties and resistance to crack and cut

Adhesive

  • Adhesives suitable for plywood are made by oxidizing CNSL with potassium permanganate or manganese dioxide at 100degC reacted with para-formaldehyde and compounded with CuCl2.
  • Also CNSL modified with furfural, aniline, xylol, etc. gives good plywood adhesives.

CNSL Based Resins

  • It is highly suitable for surface coating application, where outstanding film properties and very high resistance to water and chemicals are required. Therefore, CNSL Resin is used commonly as a paint raw material due to its high water and chemical resistant property

CNSL Formaldehyde Resins (Novolac)

  • These resins can be used for Surface Coatings with or without oil modification when high chemical resistance is desired

CNSL Aldehyde Resin

  • Excellent material for the purposes like Insulating Varnishes, Molding Powders, Brake Lining Compositions, etc.

Resole type CNSL formaldehyde resin

  • Resole type CNSL formaldehyde resin is used as adhesive in the preparation of composite wood, medium density particle board etc.

Foundry Resins

  • Proven material in the formation of foundry cores

Rubber Compounding Resins

  • Incorporation of CNSL products in rubber improves tensile strength and abrasion resistance, reduces fatigue, enhances self adhesion, rubber to cord adhesion, contributes to antioxidant and antiozonant activity. The fast curing cashew modified phenol-formaldehyde resins enhance the resistance of the product to aging, chemical attack and the action of solvents and acids