Preparation of a Colored β-Cyclodextrin Fragrance Agent for Leather Finishing

Perfume β-cyclodextrin inclusion (P-β-CD) used for leather finishing has been reported already. However, when P-β-CD was directly applied in finishing of leather, some white point would appear on the leather surface because of the white of inclusion compound, which limited its application ultimately. In order to solve the problem, a colored β-cyclodextrin fragrance agent (C-P-β-CD) was prepared through P-β-CD dyed with a reactive dye. Firstly, the P-β-CD was prepared with rose oil and β-cyclodextrin by a saturated solution stirring method, and then the obtained P-β-CD was reacted with a reactive dye to get a colored inclusion. The optimal dyeing conditions of P-β-CD are as follows: the dosage of NaCl is 40g/L, the dye 3.0%, the Na2CO3 15g/L, and the dyeing temperature at 60°C. In addition, the C-P-β-CD was applied in finishing process for fragrant leather and the flavor concentration volatilized from treated leather was evaluated by sensory test. The results demonstrated that the C-P-β-CD could well solve the problem of white spot on the surface of dark color leather with P-β- CD, and the lifetime of leather fragrance was still up to 10 days when the leather with C-P-β-CD was stored under conditions of higher temperature and UV intensity.