| For the purpose to find a real cleaning dyeing process of the polyester-cotton blends,the polyester-cotton blends were modified with the PECH-amine firstly,and then the modified blends were applied to one bath dyeing with encapsulated disperses/ reactive dyes in the absence of auxiliaries.The synthesis of PECH-amine in the laboratory,the polyester-cotton blends modification process with the PECH-amine,and one bath dyeing process of the modified polyester-cotton blends have been studied in this paper.Polyepichlorohydrin-dimethylamine(PECH-amine) has been prepared primarily.The results have showed that there was a significant modification of the cotton fiber and no obvious modification of the polyester in the polyester-cotton blends.So the modification process of the polyester blends can be ensured by exploring the modification of the cotton fabric in the polyester-cotton blends.The mightiness of modified polyester-cotton blends changed less.The modified polyester-cotton blends appeared the graft phenomena.The penetration time of it reduced from 300s to 7s and the moisture permeability decreased from 18.6×10-3(g/(hr·cm2)) to 14.97×10-3(g/(hr·cm2)).Factors to the modification process of the polyester-cotton blends with PECH-amine like the concentration of the PECH-amine,sodium hydroxide,modification time,temperature and different kinds of methods have been studied.The results showed that the modified method by immersion is better than the other kinds of modification methods when the polyester-cotton blends were dyed with the Argozal NF reactive dyes in the 1%-2.5%o.w.f..The concentration of the PECH-amine increased with the increasing concentration of dyes,the suitable conditions of exhaustion process are:PECH-amine 1-5g/L,NaOH 2g/L,95℃,50min.Modified the polyester-cotton blends in above condition,the exhaustion rate of the cotton fabric in the modified polyester-cotton blends for the Argozal NF reactive dyes can be increased to 95%,and the dyes were exhaustion.For the modification has the effect of the fixation,and the fixation rate of the modified polyester-cotton dyes goods can achieve more than 90%.In the 3%,3.5%o.w.f.,the exhaustion rate for the reactive dyes can be achieved about 80%.In addition,salt can not increase the exhaustion rate of the reactive dyes.The modified polyester-cotton blends were dyed with encapsulated disperses/Argozal NF reactive dyes in the absence of auxiliaries one bath one step.Namely in the absence of auxiliaries, the reactive dyed in 100℃and the encapsulated disperses dyed in 130℃.In the paper,compared to two bathes two steps encapsulated disperses/Argozal NF reactive dyes with auxiliaries,the K/S of the modified polyester-cotton blends dyed goods increased 5%-15%.Compared to the untreated polyester-cotton blends applied to one bath one step encapsulated disperses/Argozal NF reactive dyes with auxiliaries,the K/S of the modified polyester-cotton blends dyed goods increased by 100%.Due to in the 1%-2.5%o.w.f.,dyed without salts under neutral conditions,the reactive dyes have been exhausted,and the polyester dyeing by the encapsulated disperse have been able to dye in the absence of auxiliaries.Further more the modified polyester-cotton blends with one bath one step can be dyed with encapsulated disperses/Argozai NF reactive dyes in the absence of auxiliaries,so the cleaning dyeing of the modified polyester-cotton blends was basically come true.There were not BOD and COD in the dyeing wastewater,so it can be discharged directly.The results also showed that the level dyeing property of the modified polyester-cotton blends was equivalent to that of the untreated one.The levels of the rubbing fastness and the soaping fastness of the modified polyester-cotton blends dyed goods were equivalent to or somewhat increased with that of untreated one.The light fastness of the modified polyester-cotton blends dyed goods were a half or one progression decline than those of the untreated ones,but they still to be able to meet the demand of industrial application.
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