摘要
丙交酯是开环聚合制备聚乳酸的中间体。以L-乳酸为原料,氧化锌为缩合脱水催化剂,ZSM-5分子筛作裂解催化剂合成L-丙交酯。研究ZSM-5分子筛裂解催化剂的不同用量对丙交酯产率的影响。通过对产物理化性能的测定,表明加入分子筛做裂解催化剂后不影响L-丙交酯的性质。通过对反应时间测定及反应粗产率的计算,表明适量地加入分子筛能缩短反应时间,提高反应粗产率,然而过多的ZSM-5分子筛影响L-丙交酯的最终产率。
Lactide was the intermediate of PLA synthesized via the ring-opening polymerization. L - lactide was prepared by L - lactic acid as the material, ZnO as the condensation dehydration catalysts, ZSM-5 molecular sieve as the cracking catalyst. The influence of different amounts of ZSM-5 molecular sieve cracking catalyst in L - lactide yield was studied. The determination for physical and chemical properties of products proved that there was no influence for L - lactide after adding the molecular sieve as cracking catalysts. The results showed that the proper amount of molecular sieve catalysts could shorten the reaction time, improve the crude yield of L - lactide, however, the excess of ZSM-5 molecular seive effected the ultimate yield of L - lactide.
出处
《塑料工业》
CAS
CSCD
北大核心
2012年第8期14-16,共3页
China Plastics Industry
基金
天津市科技计划项目(05YFGPGX26200)
天津市自然科学基金资助重点项目(批准号:08JCYBJC11300)
关键词
L-丙交酯
裂解反应
催化剂
分子筛
L - lactide
Cracking Reaction
Catalyst
Molecular Sieve
