Influence of Talc Concentration on Angular Deformation in Injection Molded Parts of Talc and Rubber Filled Polypropylene

TAKAHARA Tadayoshi, KOYAMA Kiyohito

doi:10.4325/seikeikakou.21.223

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Other Title

タルク・ゴムを含有するポリプロピレン射出成形品におけるタルク含有量の角部閉じ変形への影響
タルク・ゴムを含有するポリプロピレン射出成形品におけるゴム含有量の角部閉じ変形への影響
タルクゴムオガンユウスルポリプロピレンシャシュツセイケイヒンニオケルゴムガンユウリョウノカクブトジヘンケイエノエイキョウ

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Description

Polypropylene (PP), filled with talc and rubber, is one of the most popular resins used for automotive plastic parts. The influence of talc concentration in PP compounds on the angular deformation of L-shaped specimens is discussed. The experimental and analytical results are as follows; 1) Angular deformation increases sharply with increasing talc concentration until approximately 10 wt% of talc. The angle reaches a maximum at 10 wt% of talc, and then decreases above the critical concentration. 2) The shrinkage in the in-plane direction of the plate specimens shows a decrease until the talc concentration reaches approximately 10 wt%, and then becomes constant above the critical concentration. On the other hand, the shrinkage in the thickness direction increases sharply until talc concentration approaches 5 %, and then decreases gradually above that concentration. 3) The strains for each sample are calculated using Hooke's Law. In this case, the force that induces angular deformation is assumed to be the difference of shrinkage between the thickness and in-plane directions. The tendencies of calculated strains are quite qualitatively consistent with measured angular deformations. 4) A deformation angle peak can be explained by the difference of shrinkage in the thickness and in-plane directions, which increase sharply until 5 wt% talc concentration. Above this concentration, shrinkage will remain constant despite an increasing flexural modulus.

Journal

Seikei-Kakou

Seikei-Kakou 21 (4), 223-231, 2009

The Japan Society of Polymer Processing

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