氧化海藻酸钠键合三聚氰胺复鞣剂的制备与应用性能

Preparation and Application Performance of Oxidized Sodium Alginate Bonded Melamine Retanning Agent

为解决传统三聚氰胺树脂复鞣剂(CMR)带来的游离甲醛释放、超标问题,本文以双醛型氧化海藻酸钠(OSA)为原料,在不同pH条件下与三聚氰胺反应合成制备了氧化海藻酸钠-三聚氰胺复鞣剂(BMR)。红外光谱、核磁共振和凝胶渗透色谱测试表明,在不同pH条件下制得的BMR具有相似的结构性质,OSA与三聚氰胺成功地进行了反应,三聚氰胺接枝到了OSA的分子链上。BMR在非铬金属络合物鞣剂鞣制绵羊革坯复鞣中的应用性能评价结果表明,相较CMR复鞣的坯革,采用BMR复鞣的坯革在增厚率、断裂伸长率、规定负荷伸长率、柔软度、丰满性、纤维分散性等物理感官性能方面具有优势,仅抗张强度和撕裂强度稍低。值得注意的是,采用BMR复鞣的坯革基本不含游离甲醛,而CMR复鞣坯革的游离甲醛含量高达242.78 mg/kg。由此可见,BMR具有良好的生态友好性,有望用于生态皮革的制造。

In order to solve the problem of free formaldehyde release exceeding caused by the traditional melamine resin retanning agent(CMR), in this work, dialdehyde oxidized sodium alginate(OSA) was employed to react with melamine under different pH to prepare OSA bonded melamine retanning agent(BMR). FTIR, NMR and GPC tests show that the BMRs prepared under different pH have similar structural properties. OSA and melamine are successfully reacted, and melamine is grafted onto the molecular chain of OSA. The investigation of the retanning performances of BMRs on the non-chrome metal complex tanning agent tanned sheep leather show that, compared with the CMR retanned crust leather, the BMR retanned crust leather has advantages in thickening rate, elongation at break, elongation under specified load, softness, fullness and fiber dispersion, only its tensile strength and tear strength are slightly lower. The important property is that the BMR retanned crust leather almost contains no formaldehyde, while the free formaldehyde content of CMR retanned crust leather is up to 242.78 mg/kg. Thus it can be seen that BMR has favorable eco-friendliness and it is expected to be used for the manufacturing of ecological leather.