Preparation method of mono-dispersion polysiloxane microspheres with controllable particle size

Abstract

The invention discloses a preparation method of mono-dispersion polysiloxane microspheres with controllable particle size. The preparation method comprises the following three specific steps: (1) hydrolytic process: adding a certain amount of acidic catalyst into de-ionized water, mechanically mixing uniformly to form an acidic aqueous solution with a certain pH (potential of hydrogen) value, adding siloxane monomers according to a ratio, reacting for a period of time while stirring with a certain rotation speed, to form silanol solution; (2) polycondensation process: adding alkaline solution into the reaction system obtained in the step (1) to adjust the pH value of the system, keeping a certain mechanical rotation speed under a normal temperature condition, stirring and reacting for a period of time; and (3) drying process: centrifugally separating the solution obtained in the step (2), washing by mixed solution of ethanol and de-ionized water, drying in a vacuum drying oven, so as to obtain the polysiloxane microspheres with certain particle size. The method disclosed by the invention is simple, heating and nitrogen protecting device are not required, a toxic solvent is not required, and the controllability of the particle size of the microspheres is realized.

Description

technical field [0001] The invention relates to the technical field of preparation of polysiloxane microspheres, in particular to a method for preparing monodisperse polysiloxane microspheres with controllable particle diameters. Background technique [0002] Polysiloxane microspheres are multifunctional microspheres integrating organic and inorganic properties. They have excellent wear resistance, temperature resistance, hydrophobicity and special optical properties. They are often used in inks, cosmetics, coatings, Plastic products and other industries. When the polysiloxane microspheres are applied to the light diffusion plate, the haze of the diffusion plate can be increased without ensuring the excellent transparency of the diffusion plate, so as to achieve the function of protecting eyesight. At present, most of the polysiloxane microspheres in domestic circulation are imported from Japan, Germany, the United States, South Korea and other countries. There are relative...

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Problems solved by technology

At present, most of the polysiloxane microspheres in domestic circulation are imported from Japan, Germany, the United States, South Korea and other countries. There are relatively few domestic products, and the quality of the products is uneven, and the particle size is single.

[0003] The Japanese patent (JP2000186148) is prepared by a two-step hydrolysis-condensation method, but has specific requirements for the conductivity of the acidic aqueous solution during the hydrolysis process; the Chinese patent (201310691799.9) uses surfactants and polymers in the process of preparing microspheres Stabilizer, although microspheres with low surface polarity are obtained, it increases the preparation cost and the difficulty of washing. The Chinese patent (CN102604100) only uses alkaline catalysts to prepare siloxane microspheres, although the patent obtains better sphericity and dispersion microspheres, but a single basic catalyst makes siloxane prone to implosion during hydrolysis

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