| The foamed CR was prepared by two-step molding method,the influence of addition level of foaming agent AC on the pore structure was studied,and the effect of addition level of carbon black N774,plasticiser DOP and foam promoter PEG on the physical properties of foamed CR were also investigated.It was found that the best pore structure was formed when the addition level of foaming agent AC was 6 phr.The physical property of foamed CR compound was optimized when the addition level of carbon black N774,DOP and PEG were 9,7 and 0.6 phr,respectively.As the aging time extended,the physical properties of foamed CR increased at first and then decreased, and the pore structure gradually became soft,collapsed or ruptured. |
