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林产化学与工业

林产化学与工业 ›› 2002, Vol. 22 ›› Issue (04): 55-58.

• 研究报告 • 上一篇    下一篇

毛杨梅栲胶重度亚硫酸化改性与应用研究

陈武勇, 陈发奋, 田金平   

  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
  • 收稿日期:2000-03-26 修回日期:1900-01-01 出版日期:2002-12-30 发布日期:2002-12-30

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

CHEN Wu-yong, CHEN Fa-fen, TIAN Jin-pin   

  1. The Key Lab of Leather Chemistry and Engineering, Ministry of Education, Sichuan University, Chengdu 610065, China
  • Received:2000-03-26 Revised:1900-01-01 Online:2002-12-30 Published:2002-12-30

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摘要： 在高温和铝化合物存在下,对毛杨梅(Myrica esculenta)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,NaHSO3 30份,Na2SO3 36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。

关键词: 毛杨梅栲胶, 单宁, 亚硫酸化改性, 制革, 复鞣

Abstract: 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 NaHSO3,36 part Na2SO3 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.

Key words: Myrica esculenta extract, tannin, sulfitation, leather making, retanning

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