The reaction between urea and formaldehyde has proved to be extremely complicated. It took about 40 years to reach the present stale knowledge of this reaction, and there are still many problems. Urea has a four replaceable hydrogen atoms and thus a functionality of four, so there are various possibilities for reaction with formaldehyde. It therefore have the capacity of building up a three dimensional space lattice. The molecular proportion of urea to formaldehyde is very important, as the relative amount of the reactants determine, to a large extent, the properties of the product. The reaction temperature is another decisive factor, ambient, medium or high temperature produces resins with different properties. The same urea-formaldehyde condensation product may have different applications, which demand higher or lower viscosity. It is therefore essential to define the resins as to their extent of condensation. These possibilities of variations largely amount for the remarkable versality of urea-formaldehyde resins. The reaction of urea and formaldehyde was studied many years ago, by goldschmidt in 1896. The investigators used various amounts of urea and formaldehyde in acid solutions of various strengths. He obtained insoluble, white granular deposits which were analysed and found to correspond to the emperical formula C3H10N7O3. He had no use for this compound then. However, this is called "Goldschmidth Compound" was later made with varying amounts of formaldehyde and was therefore some what different from its original compositions. Its formula was given as: (CH2 = NOCHNCH2NHCONH CH2OH)x. It was believed that the - N=CH2 group was polymerized to form a high molecular weight substance. Einhorn and Hamburger in 1908 made it a point in their experiment to use only mild reaction conditions only. The condensed urea and formaldehyde in alkaline solutions, by neutralization and drying. They isolated various white, crystalline easily soluble products. These products were given formula: NH2CONHCO2OH, CO(NH CH2OH)2 and named as methyllolurea and N,N1 - dimethylolurea are converted into insoluble substances, similar to Goldschmidts compound. After the successful commercialization of the phenolic resins in 1920's the next thermosetting class of resins were the ureas which are now considerably developed. Ureas are much different from the phenolics in properties and therefore are not competitive. They mould much the same as the phenolics and can use the same kinds of moulds and presses, their characteristics suggests several uses where phenolics are not suitable. The majority of the ureas plastics are alphacellulose flock filled and thereby can be prepared in highly attractive light pastel shades and colours. These plastics urea a hard glossy finish which is fairly mar-resistant. They resist most chemicals and solvents solutions and tasteless and non-toxic. This quickly suggests their use in plastic dishware and utensils. They are readily coloured in both brilliant and pastel shades. The properties of urea plastics possess some of the outstanding characteristics of the urea resins which are heat resistant at high temeperature, excellent relectrical resistant, high moisture resistant, good adhesive strength, better mechanical strength and attractive colour and finishes to moulded articles for increased beauty and usefulness.
UREA FORMALDEHYDE AND MELAMINE FORMALDEHYDE MOULDING POWDER (EIRI-1030)
Cost Estimation
Plant Capacity 10 Tons/Day
Land & Building (Area 10000 Sq.Mt.) Rs. 11.41 Cr.
Plant & Machinery Rs. 95 Lacs
W.C. for 3 Months Rs. 3.04 Cr.
Total Capital Investment Rs. 15.67 Cr.
Rate of Return 50%
Break Even Point 33%
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