The Development On Durable Repellent Finishing For Worsted Fabrics

The concavo-convex structure on the surface of the lotus leaf has been simulated in thispaper by a two-step method,to implement the effect of super water repellent.Firstly,fabircs surfacemodification; Secondly, water-repellent finishing.The first step,the scale layer of wool has been etched by using oxidizing reagents orbiological enzyme.By controlling modification time, temperature and chemical materials and theconcentration of enzyme,the best modification technologies was decided.In this process,we usethe water-repellent contact Angle and water-repellent grade to evaluate the level of water-repellentfor the fabrics.The specific technological parameters of modification are as follows:Firstly,the oxidizing reagents modification of worsted fabrics.By using single factorvariables, the influencing level of each factors was determined.Under the orthogonal experiment,the optimum technological parameters of oxidizing reagents modification were achieved:themodification temperature is55℃,the modification time is40min, the ratio between Sodiumdichloroiscocyanurate and Sodium persulfate is2:1.The water-repellent contact Angle of optimummodified fabrics can be up to133°.Secondly,the enzyme modification of worsted fabrics.Different levels of concentration ofenzyme were used in these experiments,by controlling the modification time,the modificationtemperature,the influencing level of each factors was determined. According to orthogonalexperiment,the optimum technological parameters of enzyme modification were achieved:thetemperature is50℃,the modification time is40min,the enzyme concentration is2%.Thewater-repellent contact Angle of optimum modified fabrics can be up to132.9°. At the same time,the SEM was used to observe the surface structure of wool fabrics which had been modified bychemical reagent and enzyme.The results show that the modified worsted fabrics surface has a certain degree of convex-concave structure.The second step,the fabrics which had been modified by the best modification technologieswas chosen to do the further water-repellent finishing. By Mixing water-repellent finishing agentTeflon C6additives (OleophobolTMCP-SLA) or water-repellent finishing agentC4PM-3633(3M) with lotion-resistance EXT in a bath,and controlling different baking temperature,the bestwater-repellent finishing technologies was finally decided.The optimum technologies parameters of water-repellent finishing based on the oxidizingreagents modification:the concentration of C6is40g/L,the baking temperature is100℃. After10times water-cleaning,the water-repellent contact Angle is132.1°.After1000times friction, thewater-repellent contact Angle is128°.Without any cleaning and friction,the optimum waterrepellent finishing effect can achieve151.2°which has reached the super water repellent level.Atthe same time,The optimum technologies parameters of water-repellent finishing based on theenzyme modification:the concentration is C640g/L,the baking temperature is100℃.Theoptimum water repellent finishing effect can achieve142.3°;after10times water-cleaning,thewater-repellent contact Angle is121.3°;after1000times friction, the water-repellent contact Angleis116.5°.Finally,the technologies process of durable repellent finishing for worsted fabrics wasdetermined:according to the above experiments,oxidizing reagents modification and C6superwater-repellent finishing was chosen.As to the chemical modification,the modification temperatu-re is55℃,the modification time is40min,the ratio between Sodium dichloroiscocyanurate andSodium persulfate is2:1.As to the water-repellent finishing,the concentration of C6is40g/L,thebaking temperature is100℃.