A method of manufacturing colorless synthetic fibers to protect the paper from a fake

 

(57) Abstract:

Use: production of securities, protected from fraud, of synthetic fibers with specific properties. The inventive polyamide fiber with red fluorescence produced by deposition on the surface of the source fiber chelate complex of europium or samarium from a solution in an organic solvent. Then on the fiber instill photoinitiator methyl ether of benzoin. Then polymerized on the surface of the fiber oligopyrroles in aqueous-ammonia solution hexamethylentetramine under the action of UV radiation.

The invention relates to a method of processing synthetic fibers with a view to their modification to obtain the specified properties. The main applications of such fibers production business, bond and securities are protected from forgery.

There are different ways of processing fibers to give them a certain optical properties. Their paint from the surface under pressure in autoclaves, process solution optical brighteners and phosphors, which are fixed on the surface by using different technological methods. A special place among about ecotilling elements (REE) and in particular, their mixed chelate complexes, giving the fibers a bright red fluorescence. In the patent [1] described a method of manufacturing a fluorescent fibers, which chelates of rare-earth elements such as europium (Eu) and terbium (Tb), caused by precipitation in the surface of the processing solution in an organic solvent.

Closest to the claimed object of technological solution is a method of manufacturing colorless synthetic fibers to protect the paper against forgery, in which the surface of the fluorescent coloring applied chelates on the basis of different di-ketones, and nitrogen-containing organic bases [2] it Should be noted that these fibers are low adaptability in terms of the manufacture of paper, due to the hydrolytic instability of the chelates of rare earth in acidic environments, as well as their low (no more than 60oC) heat resistance. As well as in the manufacture of security papers use the pulp, the pH of which is usually 5 to 7, the fluorescence fiber partially suppressed already in the process of manufacture of paper. Subsequently, when the securities of the intensity of the fluorescence fiber continues to decline due to the presence in the paper pulp will fill polimernymi shells, which is applied by the polymerization of monomers in the presence of initiators [3] for Example, a known method of applying a polymer coating on polyethylene terephthalate fibers by grafting acrylic monomers (acrylamide, acrylic and methacrylic acid) in the presence of initiator (benzoyl peroxide) under thermal influence. The polymerization can also be caused by ionizing radiation, UV light, electron discharge [4] For polyamide fiber coating methods by graft polymerization in the patent literature are not given.

Technical problem on which this invention is directed, is to enhance the hydrolytic stability colorless polyamide fibers with a red fluorescence to protect the paper from a fake. The technical problem is solved due to the fact that the polyamide fiber precipitated chelate complex REE europium (Eu) or samarium (Sm) from a solution in an organic solvent, and optionally form a spatially-linked membrane by grafting initiator, followed by polymerization of oligoadenylate in the environment 5 - 7 wt. water-ammonia solution hexamethylentetramine at a pH of 9.5 to 10.5 by exposure to UV radiation.

oC) that there is a negative impact on the intensity of the fluorescence. The process of forming a coating on the fiber in an aqueous-ammoniacal solution of hexamethylenetetramine (urotropine) at pH 9,5 10,0 justified the high chemical stability of the chelate complex in this environment.

The achieved stability of the fluorescent properties of polyamide fibers with a polymer sheath allows you to use them as a reliable means of protection paper from forgery, intended for the production of the shares, certificates, banknotes, etc., in Addition, the presence of the polymer space-stitched shell in polyamide fiber in the paper, is an additional protective element for establishing the authenticity of the paper methods of technical and criminological research.

The invention is as follows. For the production of paper containing as a protective element colorless fluorescent fibers using polyamide yarn billaut 25 ml of 1 wt. solution in acetone mixed chelate complex of europium or samarium. The contents of the glass are thoroughly mixed and kept in a closed state within 24 hours Then add water until you highlight chelate complex in the form of a turbid suspension. After 2 hours, the fiber is separated from the solution and dried in air. The obtained polyamide fibers have a bright red fluorescence (em.612 nm), colorless in the visible spectrum, but their fluorescent characteristics with the introduction of fibers in the pulp proved to be unstable. To avoid the negative impact of paper pulp on the properties of fibers covered with a polymer shell. At the first stage to the fibers impart photoinitiator methyl ester of benzoyl. In 2 wt. the solution photoinitiator in isopropyl alcohol, put fiber, processed mixed chelate complex of europium, samarium based on 6 g of fibre per 100 ml of solution. The mixture was incubated 30 min at room temperature, after which produce rapid evaporation of isopropanol under vacuum (residual pressure of not more than 12 mm RT. Art.). As a result, photoinitiator thin layer is deposited on the fiber.

Polyamide fibers with a chelate complex, osazuwa (wt. PM):

5% aqueous ammonia solution of urotropine (pH 8.5) 93,8

the monomer of DMAG (dimethylaminomethylphenol), purified by distillation 6,0

emulsifier (OP-10) 0,2

The reaction mass is subjected to intensive emulsification using a magnetic stirrer (1500 rpm) and irradiated with UV light for 30 minutes At this temperature the reaction medium does not exceed 37oC.

The result is an aqueous dispersion of fibers coated with a polymer shell, which clearly can be observed using a conventional optical microscope with magnification of 67 times. The shell has a granular structure and is a spatial-linked structure.

This dispersion is injected into the pulp before forming the basis of 50 ml of the dispersion per 1 liter of paper pulp with a solids content of 30 g/L. the Paper web produced on a laboratory paper machine contains 25 30 fluorescent fibers per 1 square inch

Visual observations and instrumental studies using an MPF 24A firm Hitachi (Japan) showed that the intensity of fluorescence of fibers ebb paper has not changed. Storing paper for 3 years did not result in a noticeable decrease in the intensity flu forgery, including deposition on its surface chelate complex of a rare earth element from a solution in an organic solvent, characterized in that the synthetic polyamide fibers are used as the rare earth element europium or samarium, and additionally on the fiber form of the spatial-linked membrane by grafting photoinitiator and subsequent polymerization of oligoadenylate in the environment 5 7% aqueous ammonia solution hexamethylentetramine at pH of 9.5 to 10.5 by exposure to UV radiation.

 

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