Improved Mechanical Properties of New Melamine Prepared Resins

Abstract

The melamine resin has a good chemical properties against alcoholic and water
solutions but it has a very long time of reaction and curing. The period of reaction by
could be rapid the reaction between urea – melamine to improve the functionality and
adhesion then improve the mechanical property of melamine resin only .
Five mass ratios of urea to melamine (U:M) and melamine to formaldehyde
(M:F) were prepared as (2:50,4:50,6:50,8:50,10:50) (1:9,2:8,3:7,4:6,5:5) gm/gm at
different operation conditions of temperature (20-110oC ), mass ratio (1-10) , and time
of reaction ( 1-3 hrs). by using a design reaction system of nitrogen and reflux. The
drying system was applied to the prepared adhesives and then check the optimum
conditions of preparation on the testing properties .
The results indicated that optimum mass ratio which gave an optimum
mechanical properties is 6:50 (U:M) , and 3:7 (M:F). The impact load is 9 J/cm for
(U:M) and 12 J/cm (M:F), compression load is 0.5 kN/Cm (M:U), 0.8 kN/Cm (M:F),
tensile load 42 dyne /cm (M:U) and 97 dyne /cm (M:F),and bending load of 2.3 mm
and 2.2 mm for (M:U) and respectively (M:F).