关键词: 浸轧, 蓝晒, 润湿性, 工艺优化, K/S值

Abstract: In order to investigate the optimal experimental conditions for cyanotype process of textiles, the cyanotype effects of different fabrics from cotton, linen and silk were evaluated via K/S values and the reason for the color difference was analyzed via the diffusion of photosensitizer on fabric surfaces. It is found that the wettability has a significant effect on cyanotype tanning for different fabrics and it is also crucial to tune the diffusivity of photosensitizer agents on fabric surfaces. Parameters like photosensitizer concentration, mixing ratio and exposure time were optimized and investigated to evaluate the feasibility of dip-padding and cyanotype method. SEM and TG analyzer were applied to characterize the morphology change and temperature-mass change relationship and the deposition mechanism of Prussian blue (PB) was investigated. Results indicate that the best loading process requires a photosensitizer concentration of 140 g/L, a mixing ratio VA: VB of 1:1, and an exposure time of 20 min. Large amounts of solid particles are deposited onto cotton fabric with an average size of 0.42±0.16 μm. TG analysis shows compared to pristine cotton fabric, the residue rate of PB-loaded cotton fabric increases to 14.22%, demonstrating that PB is successfully deposited onto the cotton fabric. Its breaking force declines dramatically by 24.5%, whilst there is no obvious change in breaking elongation. The color fastness to washing is grade 4. These performances are compliant with the wearing criteria in China.

Key words: dip padding, cyanotype, wettability, process optimization, K/S value