Preparation method of fluorescent pigment latex

Abstract

The invention relates to the preparation field of polymer material, aiming at providing the improvement of the preparation method of fluorescent pigment latex. The fluorescent pigment latex prepared by the method has fine particle diameter, uniform distribution, bright color and luster, and also excellent properties of temperature resistance, acid-base resistance, and sun and weather resistance. The technical proposal is as follows: the preparation method of the fluorescent pigment latex comprises the following steps of: 1. preparing a solution system: adding water into a reactor, and stirring for dissolution after sequentially adding a dispersant, a surfactant and a fluorescent dye, thus forming a uniform solution system; 2. adding monomers into the solution system, and stirring to form a uniform emulsified liquid system; and 3. adding an initiator after heating the prepared emulsified liquid system until the temperature is raised to 40 to 100 DEG C, and preparing the required product by polyreaction.

Description

A kind of preparation method of fluorescent pigment emulsion technical field The invention relates to the field of preparation of polymer materials, in particular to a preparation method of fluorescent pigment emulsion. Background technique Fluorescent pigments are a kind of polymer coloring materials. In addition to producing color effects through optical effects such as selective absorption and reflection of natural light like ordinary pigments, under certain conditions, they will also absorb high-frequency and short-wave light energy. Through the change of electronic energy level, the light energy converted into low frequency and long wave is released, and its brightness is more than three times higher than that of traditional ordinary pigments, which can attract people's attention more. Fluorescent pigments are used more and more in the fields of plastics, plastics, coatings, inks, etc., especially in those occasions that need to be eye-catching. However, when it is u...

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Problems solved by technology

U.S.Pat.No2928873 and U.S.Pat.No3116256 describe in detail the use of aminotriazine and aromatic sulfonamide with paraformaldehyde for polycondensation reaction to prepare substrate resin, then compound dyes in it, and then prepare fluorescent pigment by crushing and milling method, the particle size of the product prepared by this method is greater than 1 micron, and the particle size distribution is wide; but it is difficult to prepare a product with an average particle size of less than 5 microns by crushing and milling, and the cost of crushing and milling is also very high

U.S.Pat.No3190850 describes the preparation of fluorescent pigments by a method of copolymerization or grafting of polymers and dyes. The dyes attached to the surface of the polymers are easily dissolved in water for the products prepared by this process. or other media, in order to avoid this phenomenon, it is necessary to add tannic acid, molybdic acid, sodium tungstate or other mordants, resulting in poor purity of the product, and it is difficult to show a good daylight fluorescence effect

Belgian patent BritishPat.No.770889 describes a method for dissolving fluorescent dyes by using 90% acrylonitrile and 10% hydroxypropyl methacrylate and other substances, and then triggering polymerization to prepare fluorescent pigments. The product particles obtained by this process are relatively fine , but its light fastness is poor, and it is also prone to particle agglomeration and agglomeration in the actual process of synthesis

This is because acrylonitrile is a monomer that is difficult to polymerize, and it cannot be completely polymerized under the condition of such a high content in water. Generally, in a reaction system with an acrylocyanide content exceeding 30%, it is easy to occur during the polymerization process. Gel, can't get a good quality product

At present, there is no better implementation method to solve the above problems