微孔发泡注射成型机理

Mechanism of microporous injection molding

采用球形模型描述气泡长大物理过程,建立并求解气泡长大控制方程,以红旗轿车仪表盘为例研究了微孔工艺压力(MMP)和物理发泡剂(N2)含量对于泡孔的密度、尺寸、形貌的影响。研究结果表明:气泡成核数越大,物理发泡剂的含量越高,泡孔半径越小;MPP和N2含量的最佳取值分别为14 MPa和1.2%;气泡长大数学模型所揭示的气泡成核数和发泡剂含量对泡孔密度及尺寸的影响规律与实验事实相符,但本模型不能预测气泡的成型缺陷。

A spherical model was used to study physical process of the gas bubble growth,and its governing equations were derived and solved.The influence of the microporous molding pressure(MMP) and the amount of the foaming agent(N2) on the density,size and morphology of the gas bubble were investigated experimentally taking the instrument panel of Hongqi car as an example.The results show that the more enhancing the bubble nucleation and the larger the amount of the foaming agent,the smaller the bubble cell size.Th...