Method for preparing floating bed white ball resin with uniform density

Abstract

A method for preparing floating bed white ball resin with uniform density which is used for a water treatment ion exchanger comprises the steps of: throwing a water phase consisting of a styrene oil phase, dispersant and water into a reactor for suspension polymerization, with the polymerization temperature for a first section of 60-85 DEG C and the time of 3 hours to 8 hours, and the polymerization temperature for a second section of 86-95 DEG C and the time of 4 hours to 10 hours; after reaction, adding foaming agent with the styrene quality of 1 percent to 5 percent under 105-115 DEG C for 3 hours to 8 hours for preparing spherical particles with the particle diameter of 0.5-2.0mm; adjusting the air volume of a suspension reactor to be 0.2-10kPa, under the temperature of 90-110 DEG C, with the residence time of spherules of 20 seconds to 300 seconds, for preparing the white ball resin with the particle diameter of 0.8-3.0mm and the bulk density of 0.10-0.55g / ml. The polystyrene sphere prepared by the invention has uniform particle size and density and good strength. By adjusting the air volume and the temperature for controlling the density of the sphere, homogeneous materials of different density levels can be prepared, thereby being capable of meeting the technical requirements of water treatment exchangers, foam plastic filter layers and styrene polymers with high foaming multiplying power.

Description

technical field [0001] The invention relates to a synthesis method of an organic polymer material, in particular to a preparation method of polystyrene floating bed white ball resin. Background technique [0002] In devices such as ion exchangers used in industrial water treatment systems, especially inside floating bed ion exchangers, a low-density inert coating resin is often used to cover the water surface, that is, floating bed white ball resin. Generally, spherical micro-expanded polystyrene is selected. The usual method is to put polystyrene balls containing foaming agent into water to heat or send the balls to a fluidized bed dryer for heating, so that the balls are heated and softened and expanded, and screened after cooling to select the required particle size, that is, Products available for this purpose. [0003] Patent CN1044943 describes a hot water pre-expansion process for expandable polystyrene beads, adding a foaming agent in water to make the beads therma...

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Problems solved by technology

[0004] Because the above method is difficult to control the foaming degree of polystyrene balls, the density difference between resin balls is relatively large, and the particle size range of the balls is also wide

[0005] The covering layer resin with uneven density is used in industrial water treatment equipment. Under the pressure condition in the resin bed, it is easy to deform and harden, causing some low-density spheres to be easily eroded by water flow and become fragments to block the water cap and increase The pressure difference of the bed is increased, which brings inconvenience to the normal operation of the water treatment device

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