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미세다공필름 물성에 분산성이 개선된 이산화티타늄이 미치는 영향

The Effects of Titanium Dioxide Improved Dispersion Property on Microvoided Film Properties

김문선 정재관^†

Moon-Sun Kim Jaygwan G. Chung^†

성균관대학교 화학공학과, 수원 440-746

Department of Chemical Engineering, Sungkyunkwan University, Suwon 440-746, Korea

HWAHAK KONGHAK, October 2000, 38(5), 645-652(8), NONE

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Abstract

종이와 같이 가볍고 백색도가 높으면서 기계적 특성이 우수한 미세다공필름을 제조하기 위하여 폴리에틸렌테레프탈레이트수지와 플리프로필렌수지, 이산화티타늄을 혼합하여 필름내부에 미세한 공간들이 균일하게 생성할 수 있는 조건에 대해 연구하였다. L/D비가 40인 투윈스크류 압출기를 사용하여 압출량 20 kg/h, 스크류의 회전속도가 400 rpm인 비처리량이 0.05 kg/h·rpm 조건에서 인장강도가 가장 높았으며 폴리에틸렌테레프탈레이트수지 88 wt%와 폴리프로필렌수지를 12 wt% 조건으로 혼합하는 것이 우수한 기계적 특성과 낮은 밀도를 동시에 만족할 수 있는 최적 조건이다. 이산화티타늄의 분산성은 미세다공필름의 밀도와 기계적 특성에 영향을 미쳤으며 이산화티타늄 표면에 올소인산이 분산제로 사용된 15 mgPO₄^-3/g이 가장 좋은 효과가 있었다.

We have studied on the conditions to make uniform microvoids inside a film by blending with polyethyleneterephthalate, polypropylene and titanium dioxide in order to produce microvoided films with light weight like paper, high whiteness and brilliant mechanical properties. In twin screw extruder with length to diameter ratio(L/D), 40, it was possible to get the highest tensile strength at specific throughput of 0.05 kg/h with the extrusion amount of 20 kg/h and screw rotational speed of 400 rpm, and to satisfy the good mechanical properties and low density at the blending conditions of polyethyleneterephthalate, 88 wt% and polypropylene, 12 wt%. It was found that the dispersion property of titanium dioxide affected the density and mechanical properties of microvoided films and the effect was best at the condition of 15 mgPO₄^-3/g as the surfactant on titanium dioxide surfaces.

Keywords

Titanium Dioxide Microvoided Film Orthophosphates Adsorption Polyethyleneterephthalate Polypropylene

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