Dispersing agent for fluorescent brightener, fluorescent brightener aqueous dispersion, preparation method of dispersing agent, as well as preparation method and application of fluorescent brightener aqueous dispersion

Abstract

The invention relates to a dispersing agent for a fluorescent brightener, a fluorescent brightener aqueous dispersion, a preparation method of the dispersing agent, as well as a preparation method and application of the fluorescent brightener aqueous dispersion. The preparation method of the dispersing agent comprises the following steps: firstly, separately dissolving acrylamide and an allyl polyoxyethylene ether monomer of which the polymerization degree is 23 in a proper amount of deionized water; then, controlling the temperature to be 79-81 DEG C under the stirring condition, separately adding the allyl polyoxyethylene ether monomer aqueous solution and an ammonium persulfate initiating agent into a four-mouth flask filled with a certain amount of deionized water drop by drop within 2-3 hours, and carrying out 3-4 hours' heat preservation after the drop-by-drop adding is finished; finally, carrying out cooling to prepare the dispersing agent of which the weight-average molecular weight is 10000-20000. The invention further provides the fluorescent brightener aqueous dispersion which contains the fluorescent brightener OB-1, the prepared dispersing agent and deionized water. When the fluorescent brightener aqueous dispersion is applied to whitening of a fabric, the fabric can be whitened and brightened very uniformly, and the whitening effect is obvious.

Description

technical field [0001] The invention belongs to the technical field of textile chemistry, and in particular relates to a dispersant for fluorescent whitening agents, its aqueous dispersion and its preparation and application. Background technique [0002] Fluorescent brightener (fluorescent brightener) is a fluorescent dye, or white dye, and is also a complex organic compound. Its characteristic is that it can excite the incident light to produce fluorescence, so that the dyed substance can obtain a shimmering effect similar to fluorite, and make the substance very white to the naked eye. Fluorescent whitening agent is the product with the best heat resistance among all whitening agent products. It not only has high decomposition temperature, good whiteness, and small dosage (generally 25-300mg / kg), but also has good compatibility with additives in plastics. Compatibility, mainly used for whitening polyester fiber, polyester resin, common plastics and engineering plastics. ...

AI Technical Summary

Problems solved by technology

However, the addition of any additional additives during the whitening process may have an adverse effect on the whitening effect

In addition, the patent application whose publication number is CN101072841A also discloses an aqueous dispersion of optical brightener (OBA). This aqueous dispersion does not require other additives, and its whitening effect is very good. However, it is mainly used for The whitening of other cellulose substrates does not describe whether it is suitable for the whitening of synthetic polymer materials such as polyester fibers and polyester resins. Obviously, since polyester resins and polyester fibers are mainly made of hydrophobic materials, and this The optical brightener (OBA) molecule in the invention is a very hydrophilic molecule, and its compatibility with polyester resin, polyester fiber, etc. must be very poor, so it is theoretically deduced that the aqueous dispersion prepared by this invention has a strong The whitening effect of synthetic polymer materials such as polyester resin and polyester fiber may be poor

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