Effect of silane coupling agent‐TiO2 on the sustained release performance of quaternary ammonium salt of chitosan shell fragrance microcapsules

Abstract The preparation technology of sustained release is a significant value of fragrance microcapsules. This article used quaternary ammonium chitosan (HACC) with antibacterial properties as the shell material. To research the factors affecting the density, encapsulation ratio and sustained‐release of the shell material of the coated fragrance microcapsules. According to the in‐situ polymerization method, fragrance microcapsules were prepared with aldehyde fragrance 7328 as the core material, TiO 2 modified HACC as the shell material and glutaraldehyde as the crosslinking agent. During preparation, the effects of emulsification speed, pH and core‐shell ratio on the encapsulation ratio were explored. The results showed that under the conditions of the core‐shell ratio of 3:1 and emulsification speed of 1000 rad/min, when the shell material is modified with TiO 2 and kh550, the encapsulation ratio can be reached 71.74%, which was increased by 41.5% compared with the unmodified microcapsules. And the sustained‐release time can last as long as 29 days, which was 18 days higher than that of unmodified microcapsules.