RU2708580C1 - Method of producing a composite bleach - Google Patents

Abstract

FIELD: technological processes.SUBSTANCE: invention relates to production of optical brighteners used to intensify whiteness and which can be used to mask yellowness and impart brightness or high whiteness to plastic masses, synthetic resins, synthetic fibers, paints, pigments and enamels. Method of producing composite bleach includes grinding and mixing a solid carrier based on natural or artificial minerals and an organic optical bleach. Carrier and bleach are ground and mixed in working chamber of one or several in-series installed rotary-inertia mills with shear force of 10–50 N at shear rate of 10–100 m/s.EFFECT: increased efficiency of bleaching.4 cl, 1 tbl, 1 ex

Description

The invention relates to the production of optical brighteners used to enhance the whiteness effect (the degree of approximation of color to perfectly white, that is, the color of the product / product, the surface of which diffusely reflects all the light incident on it in the entire visible region of the spectrum), and which can be used for masking yellowness and giving brightness or a high degree of whiteness to plastics, synthetic resins, synthetic fibers, paints, pigments, enamels, etc.

A known method of obtaining a fluorescent optical brightener 2,5-thiophenediylbis (5-tert-butyl-1-3-benzoxazole (QUANTEX OV), one of the optical brighteners of the OV series, absorbing light in the ultraviolet and violet regions (usually 340-370 nm) of electromagnetic spectrum and re-emitting light in the blue region (usually 420-470 nm). The bleach increases the whiteness and provides bright colors in plastics, coatings, paints, synthetic fibers, waxes, fats and oils (http://iceplast.ru/opticheskie-otbelivateli )

A known method for producing a fluorescent optical heat-resistant and chemically stable bleach 2,2 '- (4,4'-diphenolvinyl) dibenzxazole (QUANTEX OV-1), which increases the whiteness of plastics and synthetic fibers and provides bright colors. Optical brighteners function during fluorescence with the absorption of invisible UV radiation and the emission of visible blue light. Bleach is especially useful for polyester and polyamide (nylon) fibers, as well as for other high-temperature engineering plastics (http://iceplast.ru/opticheskie-otbelivateli).

A known method of obtaining optical brightener 4-4-bis (2-benzoxazole) stilbene (SNEMAH OV-1) for natural and colored polymeric materials: low and high pressure polyethylene, polypropylene, transparent and opaque PVC, styrene homo- and copolymers, including ABS , PBT, PET, polycarbonate, polyacrylates, polyurethanes. In addition to giving visible whiteness and a bluish tint, the product increases the brightness of the color and improves the gloss of polymeric materials. The dosage of the product depends on the requirements for the final product and the processing conditions (http://www.bpc-chem.ru/upload/information_system_281/6/2/9/item_6296/Safety passport%20%20OV-1.pdf).

However, the effectiveness of the bleach remains not high enough.

The technical result is to increase the efficiency of the bleach, which, in particular, allows to reduce its amount in the formulation of finished products (paints, polymer products, etc.) into which the bleach is introduced, while maintaining a high degree of bleaching.

The technical result is achieved by the method of producing composite bleach, characterized in that it includes grinding and mixing the solid carrier and optical brightener in the working chamber of one or more successively installed rotary inertial mills with a shear force of 10-50 N at a shear speed of 10-100 m / s .

As a carrier, minerals of natural or artificial origin can be used, for example, barium metaboride or calcium aluminosilicate or calcium borosilicate or calcium carbonate, including microcalcite, or barite or silicon dioxide, including silica fume, or calcium stearate or schungite.

As an optical brightener, compounds that enhance the whitening effect can be used, for example, organic compounds 4-4 dibenzoxazolyl stilbene or 4-4 bis (2 sulfonatostyryl) or the sodium salt of 4,4-bis (2-disulfonic acid styryl) biphenyl (QUANTEX CBS -X) or or 2,5-thiophenediylbis (5-tert-butyl-1-3-benzoxazole (QUANTEX OV) or 2,2 '- (4,4'-diphenolvinyl) dibenzxazole (QUANTEX OV-1) or 1, 4-bis (2-benzoxazolyl) naphthalene (CQUANTEX KCB) or 2- [4- [2- [4- (benzoxazol-2-yl) phenyl] vinyl] phenyl] -5-m ylbenzoxazole (QUANTEX KSN) or 4, 4'-bis (2-methoxystyryl) -1,1'-biphenyl or 1,1'-biphenyl-4,4 ' bis [2- (methoxyphenyl) ethoxy phenyl (QUANTEX FP127) or 4-4-bis (2-benzoxazole) stilbene (CHEMAX OV-1), etc.

The ratio of the carrier and the total amount of bleach is predominantly 10-90 wt. hours and 90-10 wt. hours respectively.

The difference of the proposed method from the prototype is the operation of grinding and mixing the optical brightener with a carrier in a rotary inertial mill.

The following are examples of the invention.

Example 1. Obtaining bleach in a rotary inertial mill.

The carrier is silica fume in a volume of 50% of a fraction of 2-100 microns. and optical bleach 4-4-bis (2-benzoxazole) stilbene (SNEMAKHOV-1, China) in a volume of 50% by means of individual volume-weight batchers are simultaneously fed into the working chamber of a rotor-inertial mill of the “RIM” type, where grinding (crushing takes place) and shear in a thin layer) due to centrifugal force with a shear force of 35 N at a shear rate of up to 90 m / s, the residence time of the raw materials in the working chamber is 7-9 seconds. The processed product from the working chamber enters the receiving hopper - storage of the finished product, then to the packaging line.

Analogously to example 1, the processed product from the working chamber of the rotor-inertia mill ROME No. 1 is fed to the receiving hopper of volumetric weighers of the mill ROME No. 1 for recycling, and then from the working chamber ROME No. 1 to the receiving hopper - the finished product storage, then to the line packing.

Analogously to example 1, the processed product from the working chamber of ROME No. 1 is fed to the screw feeder of the working chamber of ROME No. 2, and then, as in example 1, to the receiving drive of the finished product. Next to the packaging line.

Similarly, products were obtained from silica fume in a volume of 10% and optical brightener in a volume of 90% with grinding in a working chamber of a rotary inertial mill due to centrifugal force with a shear force of 10 N at a shear rate of up to 10 m / s and residence time of raw materials in the working chamber 30 sec

Similarly, products were obtained from silica fume in a volume of 90% and optical brightener in a volume of 10% with grinding in a working chamber of a rotary inertial mill due to centrifugal force with a shear force of 50 N at a shear rate of 100 m / s and the residence time of the raw materials in the working chamber 10 sec

Similarly, products were obtained using barium metaboride, calcium aluminosilicate, calcium borosilicate, calcium carbonate, including microcalcite, barite, silicon dioxide, calcium stearate and shungite as a carrier.

Similarly, products were obtained using 4-4 dibenzoxazolyl stilbene, 4-4 bis (2 sulfonatostyryl), sodium salt of 4,4-bis (2-disulfonic acid styryl) biphenyl (QUANTEX CBS-X), 2,5-thiophenediylbis as bleach (5-tert-butyl-1-3-benzoxazole (QUANTEX OV), 2,2 '- (4,4'-diphenolvinyl) dibenzxazole (QUANTEX OV-1), 1,4-bis (2-benzoxazolyl) naphthalene ( CQUANTEX KCB), 2- [4- [2- [4- (benzoxazol-2-yl) phenyl] vinyl] phenyl] -5-m ilbenzoxazole (QUANTEX KSN), 4,4'-bis (2-methoxystyryl) - 1,1'-biphenyl, 1,1'-biphenyl-4,4'-bis [2- (methoxyphenyl) ethoxy phenyl (QUANTEX FP127).

The tests consisted in comparing the whiteness of the “PL-13” Meeferd RF paint, in the CIE 1976 color coordinates along the L axis, passing through the white points, with the addition of SNEMAH OV-1 optical brightener and composite brightener obtained by both methods.

The results are presented in the table.

As you can see, the proposed method allows to obtain a composite bleach, with a bleaching efficiency superior to the bleaching efficiency of its ingredient, enhancing the whiteness effect (with the same weight of the composite bleach and optical brightener of its ingredient, the bleaching efficiency is maintained).

Claims (4)

1. A method of obtaining a composite bleach, characterized in that it includes grinding and mixing a solid carrier based on minerals of natural or artificial origin and organic optical brightener in the working chamber of one or more series-mounted rotary inertial mills with a shear force of 10-50 N at a shear rate 10-100 m / s. 2. The method according to claim 1, characterized in that, as a carrier based on minerals of natural or artificial origin, use, for example, barium metaboride, or calcium aluminosilicate, or calcium borosilicate, or calcium carbonate, including microcalcite, or barite, or silicon dioxide, including silica fume, or calcium stearate, or shungite. 3. The method according to claim 1, characterized in that as an organic optical brightener use compounds that enhance the effect of whiteness, for example, organic compounds 4-4-dibenzoxazolyl stilbene, or 4-4-bis (2 sulfonatostyril), or sodium salt 4, 4-bis (2-disulfonic acid styryl) biphenyl, or 2,5-thiophenediylbis (5-tert-butyl-1-3-benzoxazole, or 2,2 '- (4,4'-diphenolvinyl) dibenzxazole, or 1, 4-bis (2-benzoxazolyl) naphthalene, or 2- [4- [2- [4- (benzoxazol-2-yl) phenyl] vinyl] phenyl] -5-m ilbenzoxazole, or 4,4'-bis (2 -methoxy styryl) -1,1'-biphenyl, or 1,1'-biphenyl-4,4 'bis [2- (methoxyphenyl) ethoxyphenyl, or 4-4-bis (2-benzoxazole) stilbene. 4. The method according to p. 1, characterized in that the ratio of the carrier and the total amount of bleach is 10-90 parts by weight and 90-10 parts by weight respectively.