Resin particle group and its manufacturing method
A technology of resin particles and manufacturing methods, applied in chemical instruments and methods, separation of solids from solids by air flow, solid separation, etc., can solve the problems of deagglomeration of aggregated particles, difficult to see still images, images and other images , to achieve the effect of less content
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[0131] Hereinafter, although an Example and a comparative example demonstrate this invention, this invention is not limited to these. First of all, in the following examples and comparative examples, the measurement method of the volume average particle diameter of the resin particle group and the variation coefficient of the particle diameter, the measurement method of the weight average molecular weight of the seed particle group, and the volume average particle diameter of the 2 The method of measuring the number of resin particles having a particle diameter of 2 times or more and the ratio of resin particles having a circularity of 0.97 or less will be described.
[0132] [Measuring method of volume average particle diameter of resin particle group]
[0133] Measurement of Volume Average Particle Size of Resin Particle Groups (Seed Particle Groups Obtained in Production Example 1 and Production Example 2 of Seed Particle Groups, and Resin Particle Groups Obtained in Exampl...
manufacture example 1
[0184]Into a detachable flask equipped with a stirrer, a thermometer, and a reflux condenser, 3000 g of water as an aqueous medium, 500 g of methyl methacrylate as a (meth)acrylate monomer, and n-octyl as a molecular weight regulator were charged. With 5 g of mercaptan, the inside of the detachable flask was replaced with nitrogen while stirring the contents of the detachable flask, and the internal temperature of the detachable flask was raised to 70°C. Furthermore, keeping the internal temperature of the separable flask at 70° C., 2.5 g of potassium persulfate as a polymerization initiator was added to the contents of the separable flask, followed by polymerization reaction for 12 hours to obtain an emulsion. The obtained emulsion contained 14% by weight of a solid content (polymethyl methacrylate particle group), and the solid content was a group of spherical particles having a volume average particle diameter of 0.45 μm and a weight average molecular weight of 15,000. The ...
manufacture example 2
[0192] 510 g of styrene as a styrene monomer, 370 g of n-butyl methacrylate as a (meth)acrylate monomer, 120 g of divinylbenzene as a polyfunctional polymerizable vinyl monomer, 8 g of benzoyl peroxide as a polymerization initiator were dissolved together to obtain a monomer mixture. Except having used this monomer mixture instead of the monomer mixture of Example 1, it carried out similarly to Example 1, and obtained the emulsion.
[0193] To this emulsion was added 70 g (solid content: 9.8 g) of the seed particle group dispersion obtained in Production Example 1 of the above-mentioned seed particle group with a volume average particle diameter of 0.45 μm, and stirred at 30° C. for 3 hours to obtain a dispersion. Use this dispersion liquid instead of the dispersion liquid of Example 1, except that, operate in the same manner as in Example 1, carry out polymerization reaction, dehydration, washing, and vacuum drying, thus obtain the product made of crosslinked (meth)acrylate- ...
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