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Published byAnastasia Boyd Modified over 9 years ago
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SALUTATION
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PREPARATION OF UREA-FORMALDEHYDE RESIN
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AIMS OF THE PRESENT INVESTIGATION
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Raw materials: Urea, Formaldehyde (37-40%). 135cm 3 37-40% HCHO Adjusting pH in 7.5-8.0 of the solution 50 g Urea added to the solution pH adjusted to 3.5-5.0 with acetic acid Aliquots solution appeared pH of the solution adjusted to 7.5-8.0 Precipitation occurred gradually Syrup like solution obtained Colorless U- F resin 2-5 cm 3 NaOH stirring Heating for 15 mins reflux Add 1 M NaOH Vacuum distillation Keep 12 hr
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