Method for the manufacture of antibacterial viscose filament rayon and a product obtained using that method

Abstract

The antibacterial viscose rayon, according to the invention, is used for the manufacture of any type of textile articles, including items intended for medical use, ensuring a more lasting antibacterial and antifungal protection due to the uniform distribution of the antibacterial additive throughout the entire volume of the fibre. According to the invention, immediately before spinning, the viscose is mixed and homogenized with an antibacterial additive, and then spun following the classical procedure: the viscose solution, with required and strictly specified parameters is fed under pressure to the spinnerets of the spinning machine from which the cellulose solution enters a spin bath, where as a result of the chemical reactions in course is transformed into fibres subjected afterwards to a subsequent treatment. According to the invention, in the production of dope dyed antibacterial rayon, into the preliminarily prepared suspension composed of one or a couple of pigments, a specified amount of antibacterial additive is introduced, the obtained mix is homogenized and filtered, and then subjected to the classical stages of spinning and subsequent treatments.

1 . Method for the manufacture of antibacterial viscose filament rayon based on following stages: Treatment of the raw cellulose with a concentrated solution of sodium hydroxide, resulting in alkali cellulose which after that is subjected to destruction to reduce its degree of polymerization; reduction of the temperature and dosing of the quantity of alkali cellulose for the production of one batch of viscose; treatment with carbon disulphide until it is transformed into cellulose xanthate which is soluble in diluted solutions of sodium hydroxide, mixing and then filtering for removal of the impurities, deaerating and filtering again after which the already cleared viscose with 8.8% cellulose and 6.4% sodium hydroxide content and ripeness index 18.5-19.5 is fed under pressure to the spinning machines. Wet spinning is performed by passing the cellulose solution, by means of a dosing pump, through the spinneret holes into the spin bath, where as a result of the chemical reactions the cellulose from the cellulose solution transforms into rayon filament yarn; next treatment with various solutions for removal of the residues from the spin bath, resulting from the chemical reactions during spinning; followed by drying, conditioning, rewinding and quality determination, with the main characteristic that antibacterial additive for raw white bright antibacterial viscose filament rayon production is added into ready for spinning viscose, mixed and homogenized with it immediately before its spinning on the spinning machine, after which the rest of the described stages are carried out. 
     
     
         2 . A method for the manufacture of antibacterial viscose filament rayon dyed in mass, based on following stages: Treatment of the raw cellulose with a concentrated solution of sodium hydroxide, resulting in alkali cellulose which after that is subjected to destruction to reduce the degree of polymerization; reduction of the temperature and dosing of the quantity of alkali cellulose for the production of one batch of viscose; treatment with carbon disulphide until it is transformed into cellulose xanthate which is soluble in a diluted solution of sodium hydroxide, mixing and then filtering for removal of the impurities, deaerating and filtering again after which the already cleared viscose 8.8% cellulose and 6.4% sodium hydroxide content and ripeness index 18.5-19.5 is fed under pressure to the spinning machines. Wet spinning is performed by passing the dyed in mass cellulose solution, by means of a dosing pump, through the spinneret holes into the spin bath, where as a result of the chemical reactions the cellulose from the cellulose solution transforms into dyed in mass rayon filament yarn; next treatment with various solutions for removal of the residues from the spin bath, the sodium sulphate and the basic sulphur, resulting from the chemical reactions during spinning; followed by drying, conditioning, rewinding and quality determination, with the main characteristic that antibacterial additive and pigment suspension as antibacterial dyed complex for antibacterial and dyed in mass viscose filament rayon production are added together into ready for spinning viscose, mixed and homogenized with it immediately before its spinning on the spinning machine, after which the rest of the above—described operations follows. 
     
     
         3 . A method according to  claim 1 , with the main characteristic that the quantity of the antibacterial additive added Into ready for spinning viscose, mixed and homogenized with it immediately before its spinning on the spinning machine is from 0.01% to 5% in relation to the amount of the cellulose in the viscose solution, respectively in ready made antibacterial rayon filament yarn 
     
     
         4 . A method according to  claim 1  with the main characteristic that as antibacterial additive ZINC PYRITHIONE is used. 
     
     
         5 . A method according to  claim 1 , with the main characteristic that when antibacterial additive Zinc Pyrithione is added into ready for spinning viscose, mixed and homogenized with it immediately before its spinning on the spinning machine, its amount is between 0.5 and 3.5% in relation to the cellulose content in the viscose solution. 
     
     
         6 . Antibacterial viscose filament rayon products row white bright and dyed in mass obtained using the method according to  claim 1 . 
     
     
         7 . Method for the manufacture of antibacterial artificial cellulose fibers with the main characteristic that as antibacterial additive ZINC PYRITHIONE could be used.