According to the method introduced by relevant literature, take 0.5g of finished or untied silk fabric, cut it into several small pieces, and put 50mL of mixed solvent (calcium chloride: ethanol: water = 1:2:8 molar ratio) In the solution, refluxed for 30 rain at 95°C. It was found that the untied silk fabric was completely dissolved, and the sorted silk fabric showed different degrees of insoluble matter according to the treatment conditions, and some samples were even almost insoluble. It is obvious that after the silk fiber is completely dissolved in the ternary solvent, the calcium hydrated ions coordinate with the hydroxyl groups of the serine and tyrosine side chains on the silk fibres to form a stable sting compound. During the coordination process, the covalent bonds between molecules are dispersed and the silk macromolecules are dispersed in the solvent and dissolved. For finished silk, due to the covalent crosslinking between the finishing agent and the silk filament molecule, it is difficult for solvent molecules to remove this covalent bond. Even if the solvent disassembles the bonding bond between silk fibers, the silk-inducing macromolecules are connected to part of the crosslinking bond and part of the finishing agent chain segment. It is proved that citric acid and silk fiber molecules covalently crosslink, forming relatively stable chemical bonds, thus effectively improving the wrinkle resistance of silk fabrics.
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