Research on a new enzymatic and chemical combined degumming process for ramie
The enzymatic degumming of ramie has advantages such as energy conservation,environmental protection,and mild operating conditions,but there is a disadvantage of high residual gum rate in fine dried hemp.This article starts from the perspective of strengthening chelator pretreatment and alkaline oxygen post-treatment,and evaluates the improvement of ramie enzymatic degumming effect using residual gum rate,blue light whiteness,bundle fiber strength,softness,and wettability as evaluation indicators.The results show that under optimized conditions of chelator pretreatment(chelator 5 g/L,90℃insulation for 1 h,bath ratio 1∶15)and alkaline oxygen post-treatment(sodium hydroxide 4 g/L,TF-122H stabilizer 3 g/L,sodium silicate 2 g/L,dicyandiamide 1 g/L,30%hydrogen peroxide 2 mL/L,98℃insulation for 2 h,bath ratio 1∶15),the residual gum rate of ramie fiber can be reduced to 4.29%,whiteness can reach 63.20%,and bundle fiber strength can reach 3.55 cN/dtex.Compared with the traditional chemical degumming process,the new process produces a similar blue light whiteness for fine and dry hemp,while the strength,softness,and wettability of the bundle fibers are significantly higher than those of the traditional process,but the residual glue rate is slightly higher.
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