681 HWAHAK KONGHAK Vol. 40, No. 6, December, 2002, pp. 681-686 † * * ( ) (2002 1 10 , 2002 8 7 ) The Effect of Mass Transfer on the Cure Properties of the Urea Resin Moulding Compounds Under the Drying Process Sang Yeul Kim † , Il Gon Choi* and Byoung Chul Kim Division of Metallurgical and Chemical Engineering, Dong-A University, Pusan 604-714, Korea *Dong Kwang Chemical Co., Ltd., Pusan 604-714, Korea (Received 10 January 2002; accepted 7 August 2002) . , . , . , . , , . Abstract - In the industrial field, the theory of drying process is different from the practical application, and it is effective to reduce energy by recirculation of the heat of exhausting gas. But the study of this field may not be performed still. The cure properties of the urea resin moulding compounds was investigated according to drying temperature, drying time, recycle rate of exhausting gas and moulding temperature in the process of drying and moulding. We obtained the following results; water con- tent of material decreases with increasing drying time and drying temperature, and the rate of drying also decreases with increasing recycle rate of exhausting gas. Specially, The cure fluidity of the urea resin moulding compounds decreases, with increas- ing drying temperature, recycle rate of exhausting gas and moulding temperature. And the correlation equations on water content and cure fluidity of the urea resin moulding material were obtained through a regression analysis of experimental data. Key words: Wafer Content, Dryrate, Moulding Temperature, Fluidity, Exhausting Gas 1. , [1-3]. , , , [4-6], . , , , [7-10] . Sato [11, 12] , [13, 14]. , , , 40% [15-17] , † To whom correspondence should be addressed. E-mail: [email protected]
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HWAHAK KONGHAK Vol. 40, No. 6, December, 2002, pp. 681-686
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The Effect of Mass Transfer on the Cure Properties of the Urea Resin Moulding Compounds Under the Drying Process
Sang Yeul Kim†, Il Gon Choi* and Byoung Chul Kim
Division of Metallurgical and Chemical Engineering, Dong-A University, Pusan 604-714, Korea*Dong Kwang Chemical Co., Ltd., Pusan 604-714, Korea
(Received 10 January 2002; accepted 7 August 2002)
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Fig. 4. Schematic diagram of moulding.1. Curing zone 4. Barrel2. Shell-1 5. Piston3. Shell-2 6. Tubular heater
Table 1. Used materials for urea resin synthesis
Material Purity(%) Water content(%) State Division Manufacture
Urea resin 99.8 0.2 Granular Industrial Sam Sung Chem. co.Paraform aldehyde 80 20 Granular " Japan Sam Jung co.Hexamethylene tetramine 99 1 Crystal " Sam Yang Chem. co.Ion exchange water 99.99 0 Liquid " Dong Kwang Chem. co.
Table 2. Wet mixed materials
Material Purity(%) Water content(%) State Division Manufacture
Syrup 50 50 Liquid Industrial By this experiment Pulp Powder 90 10 Powder " Germany J. R. S Latent cat-c 99 1 Liquid " Nito Chem. co. Lubricant 99 1 Powder " Song Won Industrial co.
Fig. 5. Relation between moisture content and drying time for variation of recycle rate of exhausting gas(TD : 70 oC).
HWAHAK KONGHAK Vol. 40, No. 6, December, 2002
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Fig. 6. Relation between moisture content and drying temperature forvariation of drying time( γγγγ : 10%).
Fig. 7. Relation between the drying rate and drying time for variationof recycle rate of exhausting gas(TD : 80oC).
Fig. 8. Relation between fluidity and drying temperature for variationof recycle rate of exhausting gas(Tm : 150oC).