UNIVERSAL ENGINEERING SYSTEMS

Mulund West, Mumbai, Maharashtra

The major operations involved in the manufacture of polyester resin are esterfication and blending which are carried in their respective kettles. The most common raw materials used are polypropylene glycol, melic anhydride and styrene monomer. In addition small quantities of inhibitors and other additives are required for the process.

The process involved is poly condensation reaction and blending the polyester resin with the monomer. Due to the sensitivity of polyester resin to contamination; in the course of condensation reaction and during subsequent handling the material of construction must be carefully selected.

Emulsion is the core element of any water based paint. All paints are combinations of pigments (colorant) emulsions and water. Along with three ingredients several additives are used in small quantities. The additives perform several key functions. The additives are generally wetting agents, helping in dispersion, anti settling agent, body agent, flow and leveling additives, driers, gloss improvers and many others.

Whenever we manufacture emulsion we are involved in a long process of 9 to 10 hrs where a DM / DI (Deminerlised) water about 50% and remaining raw material Vinyl acetate monomer about 35 to 40 % and other chemicals such as catalyst, initiators, surfactants, wetting agent are added. The reaction temperature is about 75 to 80. As this process is exothermic a small initial heating will helps in enhancing reaction and completion of process, in intermediate sample testing and the controlling the temperature within desired limit is essential to get excellent product.

Epoxy Resins are thermosetting viseious liquids or brittle solids of which most widely used are those delivered from the condansation reaction between epichlorohydrin and bisphenol. However other polyots such as aliphatic glycols and novolac resins can be used in place of bisphenol.
Epoxy resin are supplid as either liquid or solids depending on the resin type and en duse applications. They are converted to thermoset state by any of the numerous compounds referred to as curing agent.The conversion is accomplished at room temperature or at elevated temperature. Further modifications is possible by using diluents, plasticizers, filters and other additives.

Epoxy resins are soluble in ketone, esters and other alcoholes. The major application of epoxy resins are in the field of adhesives, surface coatings, lamination nad casting.Raw materials - mainly epichlorohydrin and bisphenol.