earticle

영어

Modified phenolics can have a retarding effect on the gelation of wood oil. Modified phenolic resins can be used in media for paint, varnishes, primers, overprinting varnishes, litho, letterpress and rotogravure inks. Varnishes based on rosin phenolic are faster drying, have better durability, are harder and glosser, and have greater resistance to water than ones based on ester gums. These physical properties is concerned with molecular weight distribution of rosin modified phenol resin. This paper was studied about molecular weight distribution of rosin phenolics which where prepared between 130~250C. The results were as follows:1) Average molecular weights increased with increasing reaction temperature. 2) Mw/Mn were from 3.43 to 46.44 with increasing reaction temperature and so the molecular weight distributions were changed from random distribution to broad distribution 3) The relation ship between intrinsic viscosity and weight average molecular weight was follows: [ ]= 1*10 M ,M =M. 4) Esterification reaction between the acid group of rosin and polyol was started about 230°C

한국어

제지공정에서 전분의 처리에 대하여 고찰하였다. 고찰결과 표면처리제와 안료 coating 제에는 습윤강도가 높고 침투성이 좋은 산화전분, 효소변성전분이 이용되고, 내부첨가제는 전분, , 산화전분, cation 전분등이 이용되고 있으나 cellulose와 전분유출을 막아 폐수처리가 용이하며 종이의 강도, 인쇄적성을 위해 cation 전분을 PVA와 함께 처리한다.