摘要
Abstract
In this study,linear low-density polyethylene(PE-LLD)was selected as the substrate to prepare powder mate-rials suitable for rotational molding process through melt blending using a twin-screw extruder,followed by processing with a mechanical mill.By controlling the feeding amount to control the thickness of the rotational molding products,five important factors were thoroughly investigated,which included the thickness of the rotational molding product,the melt flow rate(MFR)of the rotational molding material,the particle size distribution of the powder,the amount of carbon black added,and the furnace temperature of the rotational molding equipment.A systematic analysis was conducted on the minimum peak internal air temperature(PIAT-P)required to eliminate the pores in the product wall during the rota-tional molding process,the minimum peak internal air temperature(PIAT-I)required to achieve a yellowing index of 0 on the inner surface of the product,the optimal process interval(BPI)for rotational molding,and the comprehensive ef-fects of low-temperature drop hammer impact strength(LTIS)within this interval.The results indicate that the tempera-ture for eliminating pores was significantly reduced with an increase in the thickness and MFR of rotational molding prod-ucts,and the BPI of rotational molding was significantly widened.Meanwhile,LTIS was improved with an increase in the thickness.A decrease in the particle size of powder material led to an increase in PIAT-P but a decrease in PIAT-I,narrowing the BPI range during rotational molding.The effect of carbon black on the range of PIAT-P,PIAT-I,and BPI was less.Moreover,the matrix LTIS slightly increased with an increase in the addition amount of carbon black.The increase of the furnace temperature of the rotational molding equipment resulted in a slow increase in PIAT-P but significant increase in PIAT-I,consequently expanding the range of rotational molding BPI.关键词
滚塑成型/滚塑最佳工艺区间/气孔率/黄变指数/低温落锤冲击强度/影响因素Key words
rotational molding/the optimal process range for rotational molding/porosity/yellowing index/low temperature drop hammer impact strength/influence factor分类
化学化工
