Abstract: In order to keep the silk weight and increase antibacterial capacity of silk fiber, the silk fabrics were treated using the silver nitrate solution, and the silver ions were adsorbed to the silk fiber by coordination bonds, while the sericin dissolution decreased simultaneously. This paper discussed the usage of different reagents and the experimental conditions for the influences of sericin dissolution, such as silver nitrate, nitric acid, acetic acid, ammonia nitrate, fixation bath ratio, fixation time, preimpregnation time etc. As shown from the experimental results, the adsorption of silver ions on silk fiber surface can decrease the silk dissolution and increased the silk fiber weight indirectly. In the fixation solution, the usage of nitric acid especially ammonia nitrate, comparing to acetic acid, can decrease the sericin dissolution significantly. Furthermore, the preimpregnation time and fixing time should not be long, and the fixation bath ratio should be small.

Key words: silver ion, silk, sericin fixation, weighting