论文部分内容阅读
以苯甲酸甲酯为促进剂,用茂金属催化剂制备了活性丁苯嵌段共聚物(SBS)的选择性催化加氢产物,讨论了苯甲酸甲酯、SBS的数均分子量等因素在几种实验条件下对产物加氢度的影响.结果表明,每百克干胶使用0.15～0.3mmol Ti催化条件下,苯甲酸甲酯在特定添加方式下能较大程度地提高茂金属催化剂的活性.在不加入苯甲酸甲酯的情况下,Mn=6.5×104和Mn=5.5×104两种SBS基础胶加氢反应180min时加氢度均<97.0%;加入酯以后,反应60～120min时,基础胶的加氢度≥98%;与已报道的研究结果相比,将加氢反应时间缩短了60～120min.在每百克干胶使用0.15～0.3mmolTi催化条件下,数均分子量的大小也对SBS基础胶的加氢度有影响,反应30min时,Mn=5.5×104的加氢度≥97%,Mn=6.5×104的加氢度<90%;随着反应时间的延长,这种差距在逐渐缩小;反应180min时,两者已无明显差距,此时两种基础胶的加氢度都≥98%.对影响的加氢度的机理进行了解释.
Selective catalytic hydrogenation of activated diblock copolymer (SBS) was prepared by using methyl benzoate as a promoter and metallocene catalysts. The effects of methyl benzoate, number average molecular weight of SBS, The experimental results show that the catalytic activity of the metallocene catalyst can be greatly enhanced by using methyl benzoate under the specific conditions of 0.15 ~ 0.3mmol Ti per 100g of dry glue. When methyl benzoate was not added, the hydrogenation degree of both SBS base gums with Mn = 6.5 × 104 and Mn = 5.5 × 104 were all less than 97.0% after hydrogenation for 180 minutes. When the reaction was carried out for 60 ~ 120 min, Hydrogenation of base gum ≥ 98%; Compared with the reported results, the hydrogenation reaction time is shortened by 60 ~ 120min. Under the catalytic condition of 0.15 ~ 0.3mmol Ti per hundred grams of dry glue, the number average molecular weight Also has an influence on the degree of hydrogenation of the SBS base gum. When the reaction time is 30 min, the degree of hydrogenation of Mn = 5.5 × 104 is greater than or equal to 97% and the degree of hydrogenation of Mn = 6.5 × 104 is less than 90%. With the extension of the reaction time, The gap is gradually narrowing; 180min reaction time, there is no significant gap between the two, at this time the two kinds of base gum hydrogenation degree are ≥ 98% of the impact The mechanism of degree of hydrogenation is explained.