DSC CERAS ANALISIS TERMIO DE CERAS CON METODOS DIFERENCIAL DE CALOR

SDMAS

1. Jesus francisco lechuga rivera 1

2. Natural waxes were originated from vegetables, animals and minerals, also could be classified as biological and abiological waxes. Biological waxes were formed as protective substances or nutrients of the living creatures. With safe and non-toxic quality, insect waxes were widely used as forming, polishing and coating agents in food science and industry. It was well maintaining for fragrances and nutrients of fruits and preventing bacterial for better storage. 2

3. Shellac wax, insect white wax, beeswax and coccerin were taken for investigation, compared with paraffin (an abiological wax) and canauba wax (a vegetal wax), by the thermal analysis based on differential scanning calorimetry (DSC). 3 Ceroplastos ceriferus

4. Heating properties of natural products such as insect waxes could be evaluated objectively for a better developing in food, medical therapy and other industries and canauba wax (a vegetal wax), by the thermal analysis based on differential scanning calorimetry (DSC). 4

5. Materials DSC200F3 differential scanning calorimetry . Atmosfera N 2 5

6. Method 6 Sample preparation Pulverize insect waxes, paraffin and canauba wax and grind into 60 mesh powder. Instrumental calibration Indium (melting point 156.6◦C and melting enthalpy 28.45J/g) was chosen for standard calibration of instrumental cell constant and temperature, in order to obtain correct and precise determination result.

7. Method 7 Determination condition Weigh waxes samples precisely and transfer them into DSC aluminum smelting bowl. The bowl was set into DSC apparatus. Sample was heated from 0◦ C to 100◦C at the velocity of 10◦ C/min . The maintaining time was 2 min for the adequate melting of wax and the balance of instrumental baseline. Then, cool the sample from 100◦ C to 0◦ C at the velocity of 10◦ C/min by liquid nitrogen. Both the heating and cooling stages were running at 20mL/min purge gas and 50mL/min shield gas (nitrogen gas) ambience.

8. Results 8

9. 9

10. 10

11. 11

12. 12

13. 13

14. 14

15. 15

16. El análisis se realizó en la planta de cemento de la planta de la compañía Max Myanmar localizada en Lewe Township , Naypytaw , la cual se enfoca en producir cemento Portland. (OPC) 16

17. 17

18. Conclusion DSC was available for thermal characteristic determination of insect waxes qualitatively and quantitatively, with better accuracy and repeatablity than traditional mercury surface measurement. According to DSC investigation on insect waxes, melting point of them from the highest to the lowest were: coccerin , insect white wax, shellac wax and beeswax, so were the orders of softening point, the start & end temperature and the summit temperature of melting/ crystallization peaks. It was dominated on melting point and DSC curves of insect waxes by chemical compositions and molecular weight . 18

19. All the studied insect waxes were higher with their melting point than paraffin. Melting points of insect white wax, shellac wax and beeswax were lower than that of canauba wax, but coccerin’s melting point was rather higher than that of canauba wax. These were also caused by molecular composition and weight. There were some relations between melting/ crystallization enthalpies and melting point of insect waxes, except crude shellac wax. The higher the melting point, the higher the melting/ crystallization enthalpies. 19

20. Gracias por su atención 20