Abstract
Commercially used industrial baking enamels consist of alkyd or polyester resin with melamine formaldehyde. These resins are mainly derived from fossil resources. Considering growing environmental legislation regarding use of petroleum based raw materials, utilization of renewable resources to synthesize various chemistries can be the only obvious option as far as academia and industries are concerns. The present work deals with exploration of one of the natural resources (Cardanol) for polyol synthesis, its characterization (FTIR and NMR) and its curing behavior with melamine formaldehyde resin by differential scanning calorimetry (DSC). The optimized formulations from DSC study were further evaluated for general coating properties to study the suitability of developed polyol for industrial coating application. The experimental studies revealed that melamine content in the curing mixtures and thereby developed crosslinking density played an important role in deciding the coatings properties.
Highlights
The composition for the industrial baking enamels mainly consists of base resin and crosslinker along with p-toulene sulphonic acid as a catalyst to accelerate the curing mechanism
Physical and chemical characterizations of developed polyol The synthesized polyol was characterized for its physical properties [17] and chemical properties as per the ASTM standards
The curing kinetics of developed polyol with melamine formaldehyde resin was investigated by differential scanning calorimetry (DSC) using Ozawa iso-conversional method to calculate the kinetic parameters
Summary
The composition for the industrial baking enamels mainly consists of base resin (alkyd/acrylic/polyester) and crosslinker (melamine formaldehyde resin) along with p-toulene sulphonic acid as a catalyst to accelerate the curing mechanism. The base resin (alkyd/polyester) gives excellent flexibility while the heterocyclic ring of melamine resin contribute to hardness and chemical resistance properties.[1] The base resins are mainly derived from petroleum mass Though these resins have played an important role in the conventional market, their uses have been overshadowed due to stringent environmental legislation, exponential rising prices and uncertainty in the availabilities of petroleum based feed stocks. Considering these issues, the exploration of renewable resources for polymer/resin syntheses is the only obvious option.[2] Till date numbers of researchers have reported all sorts of possible applications of renewable resources such as resin synthesis, adhesives, paints, coatings, composites etc. These materials have proved to be excellent coating materials as per the earlier reports.[10,11,12,13,14] there exists compound like Cashew Nut Shell Liquid (CNSL), which can be used as a possible substitute for petroleum based feed stocks due to its availability, sustainability, cost effectiveness, and reactive functionalities
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