The invention relates to a preparation method of an anti-counterfeiting
viscose fiber. The preparation method comprises the following steps of dipping pulp in an
aqueous solution of alkali, squeezing,crushing, aging, cooling, sulfonating, and dissolving in a dilute alkali solution to obtain a crude
viscose; uniformly mixing the crude
viscose with various
amino acid metal chelates, and carrying out defoaming and
ripening to obtain a
spinning stock solution; carrying out wet
spinning and acid bath on the
spinning stock solution, and then carrying out drafting,
cutting, refining, oiling and
drying treatment to obtain the anti-counterfeiting
viscose fiber, wherein the sum of the
mass of
metal elements contained in the
amino acid metal chelates accounts for 0.03-0.11% of the
mass fraction of the anti-counterfeiting
viscose fiber. The anti-counterfeiting
viscose fiber disclosed by the invention is subjected to anti-counterfeiting
encryption treatment by utilizing various
amino acid metal chelates, and anti-counterfeiting identification is carried out by detecting and encoding metal elements and amino acid types, so that the anti-counterfeiting degree is high, and the anti-counterfeitingconcealment is good.