Melamino carbomidophenol-formaldehyde resin production flow chart

.Description of the.. process.. production of the ICFF Preparation of the reaction mixture: formalin from the tank (8) is pumped into the meter (3), which is installed on the scale. The regulated portion of formalin is drained from the meter into the cooking reactors (1). Distilled water is pumped into the gauge (3) by means of a pump, weighed and drained into the cooking reactor. Melamine supplied to the resin shop is unpacked and charged through the meter (5) to the reactor according to the accepted formulation with the vacuum turned on. The first step is the preparation of a pre-condensate. pH of suspension is set to 9.2-9.3 with constant mixing of loaded formalin, water, melamine by introduction of sodium hydroxide from vessel (10) through gauge (11). Then vacuum is turned off and steam is supplied to steam jacket of reactor (1). The mixture is heated to temperature of 92 ° C for 30-40 minutes. Steam supply is closed. At this stage, methylolmelamine, the so-called pre-condensate, is formed. All the main processes of resin synthesis and modification are carried out in digesters - reactors. Reactors are equipped with steam-water jacket and temperature control devices. A refrigerator (2) is used to cool and condense the water vapors emitted during the synthesis of resins saturated with formaldehyde and phenol and return them to the reaction medium. The second stage is condensation. To carry out the second stage, heating of the reactor is stopped, the prepared formic acid solution is introduced from the tank (13) through a meter (12) and mixing with water is started 1:55 at a mixture temperature of 90-92 ° C. When this miscibility is achieved, cooling of the reactor is included, the temperature of the mixture should be 70 ° C. Cooling takes place in about 20 - 30 minutes. Condensate is collected in collector (7) Third stage - cooling and loading of additives. During cooling, samples are constantly taken for miscibility with water, since during this period there is a process of resin formation. At a mixture temperature of 70 ° C, determine the refraction coefficient and miscibility with water. Upon achievement of 1: 2.5 - 1: 2.3 miscibility and refraction coefficient, the 1,488 continues to cool the resin. Crystalline carbamide is ground in crushing machine (14) and fed into weight gauge (4) by bucket elevator. At a mixture temperature of 50-53 ° C, carbamide is charged. The mass is cooled to 30 ° C, quality control is carried out according to the regulated parameters for the produced resin. The finished resin is supplied by gravity to the ready resin collector (6), for averaging and post-cooling, and then to the ready resin storage tank (9)