炭酸カルシウムによるポリ塩化ビニルの耐衝撃性の向上
Improvement of Impact Resistant Property of Polyvinylchloride filled with Calcium Carbonate
今西秀明・山口知宏・梅原和夫
Imanishi, Hideaki / Yamaguchi, Tomohiro / Umehara, Kazuo
It was found that the impact resistant property of polyvinylchloride (PVC) could be improved by the addition of fine powdery calcium carbonate (CC) in a sufficient dispersed state, that is, an ultrasonic wave was employed in order to disperse CC into tetrahydrofuran (THF) solvent, next the THF solution of dissolved PVC was added into this dispersed solvent. After THF was evaporated, the residual mixture was blended by a heat twin roller. Through such procedure, composite materials consisting of PVC and CC were prepared. These composite materials exhibited excellent property on impact resistance. The effect was similar to that for addition of a rubber component to PVC. It could be presumed that fine powdery CC was dispersed sufficiently into PVC matrix. It was also shown that the composite materials had increased the modulus of elasticity, slightly decreased the bending strength and decreased the melting viscosity.
Key words: Polyvinylchloride / Calcium carbonate / Composite materials / Impact resistance