Method for preparing totally chlorine-free high-whiteness cellulose fiber

[0019] (1) Preparation of brightener: Add surfactant dialkyldimethylammonium chloride and dispersant polysiloxane quaternary ammonium salt to fluorescent whitening agent SWN particles with particle size less than 3 microns, The addition of surfactant dialkyl dimethyl ammonium chloride is 0.3wt% of fluorescent whitening agent SWN; the addition of dispersant polysiloxane quaternary ammonium salt is 0.1wt% of fluorescent whitening agent SWN, add water Prepare the whitening agent slurry containing 5wt% of the whitening agent.

[0020] (2) Preparation of viscose spinning stock solution: according to the conventional process, the viscose stock solution is prepared through steps including dipping, squeezing, pulverizing, aging, yellowing, dissolving and aging, and the whitening agent slurry is prepared by 2wt of finished fiber weight % ratio, added to the maturing viscose and stirred evenly, and then degassed and filtered to obtain the viscose spinning stock solution.

[0021] (3) Spin

[0023] (1) Preparation of whitening agent: Add surfactant polyalkyltrimethylammonium chloride and dispersant dialkoxysilane quaternary ammonium salt to fluorescent whitening agent SWN particles with particle size less than 3 microns , the addition of surfactant polyalkyltrimethylammonium chloride is 1.2wt% of fluorescent whitening agent SWN; The addition of dispersant polysiloxane quaternary ammonium salt is 1.5wt% of fluorescent whitening agent SWN, Add the above mixture into the sulfuric acid solution to prepare a whitening agent solution with a fluorescent whitening agent content of 15 wt%.

[0024] (2) Preparation of viscose spinning stock solution: according to the conventional process, viscose stock solution is prepared through steps including dipping, pressing, pulverizing, aging, yellowing, dissolving and ripening, and the whitening agent solution is prepared by 3wt% of finished fiber weight The ratio is added to the ripening viscose and stirred evenly, and then the visco

[0027] (1) Preparation of whitening agent: Add surfactant polyalkyltrimethylammonium chloride and dispersant sodium tripolyphosphate to fluorescent whitening agent SWN particles with particle size less than 3 microns, surfactant The addition of polyalkyltrimethylammonium chloride is 0.7wt% of fluorescent whitening agent SWN; the addition of dispersant sodium tripolyphosphate is 0.8wt% of fluorescent whitening agent SWN, and the above mixture is added to oxalic It is prepared as a whitening agent solution with a fluorescent whitening agent content of 10 wt%.

[0028] (2) Preparation of viscose spinning stock solution: according to the conventional process, the viscose stock solution is prepared through the steps including dipping, squeezing, pulverizing, aging, yellowing, dissolving and aging, and the whitening agent solution is prepared by the finished fiber weight 1.5wt % ratio, added to the maturing viscose and stirred evenly, and then degassed and filtered to obtain the viscos