毛杨梅栲胶重度亚硫酸化改性与应用研究  

MODIFIED MYRTAN TANNIN EXTRACT BY INTENSIVE SULFITATION AS A NEUTRALIZER FOR LEATHER

作　　者：陈武勇[1] 陈发奋[1] 田金平[1] 

机构地区：[1]四川大学皮革化学与工程教育部重点实验室,四川成都610065

出　　处：《林产化学与工业》2002年第4期55-58,共4页Chemistry and Industry of Forest Products

基　　金：国家林业局科学技术研究课题(95 06 03)

摘　　要：　在高温和铝化合物存在下,对毛杨梅(Myricaesculenta)栲胶进行重度亚硫酸化改性,将改性栲胶用作皮革中和剂。研究了影响改性产物性质的一些参数,如缓冲性、中和性能等,得出最佳改性方案,其质量配比为:毛杨梅栲胶100份,NaHSO330份,Na2SO336份,含铝化合物1份,在129℃、165kPa下反应10h得到改性栲胶产物。改性栲胶水溶性良好,5%溶液pH值为7.15,10%溶液pH值为7.0。分析表明,其单宁含量在20%到30%之间,符合皮革中和复鞣剂的要求。缓冲性实验表明,适量未反应的亚硫酸盐能与改性单宁组成缓冲体系,在pH值3.5～5.5之间具有良好的缓冲性。鞣性实验表明,经亚硫酸盐处理后,毛杨梅栲胶的鞣性显著下降,收敛性缓和,渗透迅速,用量以削匀蓝革计3%～5%为佳,视铬复鞣后pH值而定,1%的用量约可使pH值提高0.3。由于改性栲胶还保留着适当的鞣性和填充性,因此它具有中和与复鞣的双重作用。The purpose of this study is to modify tannin extract used as a neutralizer for leather.In the experiment myrtan(Myrica esculenta)tannin extract was subjected to a treatment with much more sulfite and at higher temperature compared to ordinary method.A modified product was obtained when a mixture of 100 part myrtan tannin extract,30 part NaHSO3,36 part Na2SO3 and 1 part aluminum compound was heated and reacted at 129 ℃ and 165 kPa for 10 h.The modified extract has pH value 7.15 at 5% solution,7.0 at 10% solution and 20%-30% tannin content by hide powder method.It has improved buffer property to maintain stable pH value between pH volute 3.5-5.5.Tanning experiment showed that it has milder astringency and tanning properties compared with ordinary extract.Modified product at 3%-5% is enough to neutralize leather thoroughly with good leather quality.In conclusion,modified myrtan tannin extract is a new material applicable as a neutralizer for leather.

关 键 词：重度亚硫酸化改性 毛杨梅栲胶 单宁 制革 复鞣 植物鞣剂 

分 类 号：TQ943.2[化学工程] TS52[轻工技术与工程—皮革化学与工程]