40. Silk fibroin is a green additive that can be used as a finishing agent in silk fibers and wool fibers. It has good effects. What is the effect of silk fibroin in anti-wrinkle finishing of cotton fabrics? Please introduce the preparation method of silk fibroin finishing agent.
Answer: Silk fibroin is a natural biological finishing agent and a promising green additive. It is non-toxic, non-irritating and has good biocompatibility. This type of additive is widely used in protein fibers, but is rarely used in the anti-wrinkle finishing of cotton fabrics. Because the relative molecular weight of silk fibroin is relatively large, it has almost no anti-wrinkle effect on cotton fabrics. If silk fibroin is hydrolyzed into silk fibroin with a certain relative molecular weight, which is conducive to penetrating into the micro-gaps of the amorphous region of cotton fibers and cross-linking with cotton fibers, then it is possible to have a certain anti-wrinkle effect. However, after hydrolysis of silk fibroin, the relative molecular weight of silk fibroin is too small, the adsorption force between silk fibroin molecules and cotton fibers is very small, and the finishing effect may not be obvious.
Some people have done experiments to hydrolyze silk fibroin finishing agent, and then compound it with glyoxal to form an anti-wrinkle finishing agent. Its anti-wrinkle performance has been significantly improved, thus creating a new environment-friendly aldehyde-free finishing agent. A new way. The process is as follows.
① Preparation of finishing agent.
a. Take a certain mass of degummed silk and put it into the mixed solvent, where n(CaCl2): n(H2O): n(C2 H5OH) is 1:8:2, and is dissolved at 70-80°C to make a water-soluble silk fibroin liquid.
b. The dissolved silk fibroin liquid is hydrolyzed with 20 mL/L hydrochloric acid solution (3 mol/L) at 70°C for 150 minutes, and then neutralized with sodium hydroxide to neutrality, and the silk fibroin finishing agent is prepared.
②Anti-wrinkle finishing process using silk fibroin and glyoxal compound finishing agent.
a. Process flow: finishing solution after padding (room temperature, two dips and two pads, padding rate 100%) → pre-baking (80°C, 5min) → baking (120°C, 2min) → boiling (98°C, 15min) → Wash → dry (100℃, 5min) → cool
b. Working fluid prescription: silk fibroin finishing agent 50g/L, glyoxal 60g/L, aluminum sulfate 1.5~4g/L, Turkish red oil 1g/L, silicone softener CGF 30g/L.
③Post-finishing effect. After pure cotton fabrics are finished with silk fibroin and glyoxal finishing agents, the wrinkle recovery angle (warp + weft) is significantly improved,
while the whiteness and wettability have little effect, and the tearing strength is reduced ( Strength retention rate is 70%); after finishing, the wrinkle recovery angle of polyester/cotton fabrics is not as obvious as that of pure cotton, the whiteness and wettability have not changed much, but the tear strength has improved, and the pilling and pilling properties have improved. improve.
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