Method for Preparing Untwisted, Hollow, High-Count Textiles and Method for Recovering the Solute in an Alkaline Lysis Solution

Abstract

The present invention discloses a method for preparing untwisted, hollow, high-count textiles comprising the following steps: a. preparing an alkaline degradable slice; b. preparing a blended spun melt; c. preparing an easily alkaline soluble and degradable fiber by spinning; d. preparing the textiles or an embroidered article. A method for recovering the solute in an alkaline lysis solution comprises an alkaline lysis solution obtained after the degradation of the easily alkaline soluble and degradable fiber is subjected to an acid precipitation, so as to produce terephthalic acid, wherein the waste water obtained by filtering meets the emission standard and is introduced to a biochemistry processing system.

What is claimed is: 
     
         1 . A method for preparing untwisted, hollow, high-count textiles, characterized in that the method comprises the following steps:
 a. preparing an alkaline degradable slice: during the polymerization of polyester raw materials, adding 5-sodium sulfonate-isophthalate polyethylene glycol ester containing totally 1-20 wt % of polymers and isophthalate containing totally 1-20 wt % of polymers, stirring and heating the obtained mixture to 200-260° C., so as to form a slurry; transforming the obtained mixture into a reactor, meanwhile adding polyethylene glycol containing 1-20 wt % of polymers, so as to dilute and cool the mixture to 180-260° C.; sequentially adding polyethylene glycol having molecular weight of 4000-6000 into the reactor for the period of 30-60 min under stirring, wherein the amount of polyethylene glycol is 1-20% of the total weight of the polymers; heating the mixture up to 200-260° C. such that the mixed raw materials are polymerized under vacuum; finally, the polymerized alkaline degradable slice successively being casted into a strip, cooled, pelletized, dried and screened, wherein the intrinsic viscosity of the alkaline degradable slice is in the range of 0.45-0.75;   b. preparing a blended spun melt: during the preparation of a spun melt, adding an easily hydrolysable substance into the spun melt to blended therein, wherein the weight ratio of the alkaline degradable slice to the easily hydrolysable substance is in the range of 100:0-60:40; during the alkaline dissolution and degradation, said easily hydrolysable substance being filtered partly or dissolved out, such that micropores are formed on the surface of a fiber;   c. preparing an easily alkaline soluble and degradable fiber by spinning, the easily alkaline soluble and degradable fiber comprising filament yarn, staple fiber and fiber strips;   d. the staple fiber consisting of natural fiber and chemical fiber being combined with the filament yarn in the easily alkaline soluble and degradable fiber, then being reverse twisted, wherein the degree of the reverse twist substantively being the same as that of the instinct twist degree of the staple fiber; weaving textiles, then taking the textiles into an alkali solution so as to dissolve the easily degradable fibers, thereby obtaining an untwisted textiles;   alternatively, by open-end spinning or non-open-end spinning manner, the easily alkaline soluble and degradable fiber filament yarn or yarn being peripherally wrapped by periphery fibers, so as to produce a core-spun yarn, then the core-spun yarn being woven into cloth, and finally the cloth being immersed into an alkali solution, so as to dissolve the easily alkaline soluble and degradable fiber, thereby obtaining a hollow textiles;   alternatively, the easily alkaline soluble and degradable fiber being spinning with a nature fiber or synthetic fibers together, or the fiber strip of the easily alkaline soluble and degradable fiber being combed with a cotton fiber strips or a hemp fiber strips, so as to form a yarn for weaving a cloth; then the cloth being immersed into an alkali solution, so as to dissolve the easily alkaline soluble and degradable fiber, thereby obtaining a yarn high-count textile;   alternatively, making the easily alkaline soluble and degradable fiber into a non-woven fabric, and then making the non-woven fabric into an embroidery base cloth, then the embroidery base cloth being embroidered by using a embroidery thread so as to form a variety of patterns; then the non-woven fabric embroidered with patterns being immersed into an alkali solution, so as to dissolve the easily alkaline soluble and degradable fiber, thereby obtaining an embroidered article.   
     
     
         2 . The method for preparing untwisted, hollow, high-count textiles of  claim 1 , characterized in that the easily hydrolysable substance is an alkaline degradable substance. 
     
     
         3 . The method for preparing untwisted, hollow, high-count textiles of  claim 2 , characterized in that the temperature of the spinning in step c is in the range of 270-300° C. 
     
     
         4 . The method for preparing untwisted, hollow, high-count textiles of any one of  claim 1 - 3 , characterized in that the alkaline solution used in the step d is sodium hydroxide solution. 
     
     
         5 . A method for recovering the solute in an alkaline lysis solution during the preparation of the untwisted textiles, characterized in that the alkaline lysis solution obtained after the degradation of the easily alkaline soluble and degradable fiber is introduced through a grid into an adjusting pool, then the alkaline lysis solution in the adjusting pool is pumped into an acid precipitation tank via a lift pump; an acid liquid is pumped into the acid precipitation tank by an acid adding pump; the acid liquid and the alkaline lysis solution are stirred in the acid precipitation tank, thereby a waste water having pH of  3 - 4  is produced; meanwhile, terephthalic acid is produced; after the reaction of the acid liquid and the alkaline lysis solution is completed sufficiently, the waste water in the acid precipitation tank is introduced into a plate-and-frame filter press so as to be filtered, such that terephthalic acid is separated therefrom; the waste water obtained by filtering via the plate-and-frame filter press is finally introduced into a biochemistry processing system so as to meet the discharge standard. 
     
     
         6 . A method for recovering the solute in an alkaline lysis solution during the preparation of the hollow textiles, characterized in that the alkaline lysis solution obtained after the degradation of the easily alkaline soluble and degradable fiber is introduced through a grid into an adjusting pool, then the alkaline lysis solution in the adjusting pool is pumped into an acid precipitation tank via a lift pump; an acid liquid is pumped into the acid precipitation tank by an acid adding pump; the acid liquid and the alkaline lysis solution are stirred in the acid precipitation tank, thereby a waste water having pH of 3-4 is produced; meanwhile, terephthalic acid is produced; after the reaction of the acid liquid and the alkaline lysis solution is completed sufficiently, the waste water in the acid precipitation tank is introduced into a centrifugal filter so as to be filtered, such that terephthalic acid is separated therefrom; the waste water obtained by filtering via the centrifugal filter is finally introduced into a biochemistry processing system so as to meet the discharge standard. 
     
     
         7 . A method for recovering the solute in an alkaline lysis solution during the preparation of the high-count textiles, characterized in that the alkaline lysis solution obtained after the degradation of the easily alkaline soluble and degradable fiber is introduced through a grid into an adjusting pool, then the alkaline lysis solution in the adjusting pool is pumped into an acid precipitation tank via a lift pump; an acid liquid is pumped into the acid precipitation tank by an acid adding pump; the acid liquid and the alkaline lysis solution are stirred in the acid precipitation tank, thereby a waste water having pH of 3-4 is produced; meanwhile, terephthalic acid is produced; after the reaction of the acid liquid and the alkaline lysis solution is completed sufficiently, the waste water in the acid precipitation tank is introduced into a centrifugal filter so as to be filtered, such that terephthalic acid is separated therefrom; the waste water obtained by filtering via the membrane system is finally introduced into a biochemistry processing system so as to meet the discharge standard.