改性胶原蛋白施胶剂、AKD和SAE的生物降解性评价

Evaluation of the Biodegradabilities of Modified Collagen Surface Sizing Agent, AKD and SAE

关键词:  改性胶原蛋白施胶剂  构效关系  生物降解性

Key Words:modified collagen sizing agent  structure-activity relationship  biodegradability

摘要:采用BOD5/CODCr和OECD-301B两种方法对改性胶原蛋白施胶剂（MCSA）的生物降解性进行研究，并与常规施胶剂烷基烯酮二聚物（AKD）和苯乙烯-丙烯酸酯共聚物（SAE）的生物降解性进行评价与对比。结果表明，MCSA、AKD和SAE的BOD5/CODCr分别为0.32、0.28和0.21，分别属于可降解物质、降解性差物质和难降解或不可降解物质；采用OECD-301B法，第28天的生物降解性指数（IB）分别为102.55%、95.63%和92.11%，分别属于可降解物质、难降解物质和难降解物质。两种方法得出的结论一致，其生物降解能力由大至小依次为MCSA＞AKD＞SAE；同时探讨了分子结构与生物降解性的关系，MCSA与SAE分子中同样具有苯结构，但MCSA具有极性强、生物亲和能力好的特点，所以MCSA降解性较好。分析结果表明化学品的结构对其生物降解性的影响需综合考察。

Abstract:The biodegradability of modified collagen sizing agent (MCSA) was evaluated by the methods of BOD5/CODCr and OECD-301B, and its biodegradability was compared with that of alkyl ketene dimer (AKD) and styrene-acrylic ester copolymer (SAE) which were commercial products. The results showed that the BOD5/CODCr values of MCSA, AKD and SAE were 0.32, 0.28 and 0.21, respectively, they belonged to biodegradable material, poor biodegradable material and recalcitrant biodegradable or non-biodegradable material, respectively. On the other hand, their biodegradation index IB were 102.55%, 95.63% and 92.11%, respectively on 28th day, which showed that MCSA was biodegradable material while AKD and SAE were recalcitrant biodegradable materials. The experimental results obtained by the two methods were consistent. The biodegradation trends were: MCSA>AKD>SAE. Meanwhile, the relationship between molecular structure and biodegradability was studied. There were benzene structures in MCSA and SAE molecules, but MCSA had strong molecular polarity and excellent biological affinity. So MCSA had better degradability. It indicated that it is necessary to comprehensively consider the effect of chemical structure on the biodegradability．