Maleic anhydride grafted polyethylene (PE-g-MAH) with different graft ratios and high density polyethylene (HDPE)/kenaf (KF)/heat-expandable microcapsules (EMC) using a twin screw extruder (thermal expendable microcapsule, EMC) composites were prepared. 4 Types of PE-g-MAH were used, 1 type was a commercialized product, and 3 types were a product manufactured through reaction extrusion. As a result of evaluating the foaming properties, miscibility, thermal stability and tensile strength of the HDPE/KF/EMC composite, it was found that the reaction-extruded PE-g-MAH-c (graft ratio = 1.962%) with MAH3 was the best. It is judged that the decrease in the specific gravity of the foam will be advantageous for reducing the weight of automobile interior materials.

이축압출기(twin screw extruder)를 이용하여 그라프트 율이 다른 무수말레인산 그라프트 폴리에틸렌(PE-g-MAH)과 고밀도 폴리에틸렌(high density polyethylene, HDPE)/케냐프(kenaf, KF)/열팽창성 마이크로 캡슐(thermal expendable microcapsule, EMC) 복합체를 제조하였다. 4종의 PE-g-MAH가 사용되었으며, 1종은 상업화된 제품, 3종은 반응압출을 통해 제조한 제품이 사용되었다. HDPE/KF/EMC 복합체의 발포특성, 혼화성, 열안정성 및 인장강도를 평가한 결과 MAH3의 배합으로 반응 압출된 PE-g-MAH-c(그라프트 율=1.962%)가 가장 우수함을 알 수 있었고 발포체 비중 감소는 자동차 내장제의 경량화에 유리할 것으로 판단된다.

Keywords: thermal expendable microcapsule, maleic anhydride grafted polyethylene, reaction extrusion, kenaf.