Method for preparing floating bed white ball resin with uniform density

A technology of uniform density and white spheres, applied in the field of preparation of polystyrene floating bed white sphere resin, can solve the problems of wide particle size range of spheres, blocked water caps by debris, large density difference, etc. Uniform and uniform density

Inactive Publication Date: 2009-10-14
LIAONING GEOLOGY ENG VOCATIONAL COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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  • Method for preparing floating bed white ball resin with uniform density

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Preparation of polystyrene spheres

[0028] Add 40 liters of pure water to a 100-liter polymerization kettle, add 32 grams of polyvinyl alcohol under stirring conditions, gradually raise the temperature to 50 ° C, add 0.4 grams of methylene blue, stir well and add 15 kilograms of styrene and 120 grams of benzyl peroxide The oily phase formed after acyl mixing. Take samples to observe the dispersion of oil beads, adjust the stirring speed to make the oil beads uniform in size, gradually raise the temperature to 80°C, and keep the temperature for 4 hours. At this stage, the oil beads gradually aggregate and solidify into beads. After this process is completed, the temperature is raised to 92°C at a rate of 0.5-1°C per minute, and the temperature is maintained for 6 hours.

[0029] Lower the temperature to below 80°C, add 600 g of n-pentane into the reactor, close the reactor, adjust the temperature to 110°C, and keep the temperature for 6 hours.

[0030] Cool down t...

Embodiment 2

[0036] (1) Preparation of polystyrene spheres

[0037] Add 20 liters of pure water to a 50-liter polymerization kettle, add 200 grams of photographic grade gelatin under stirring conditions, gradually raise the temperature to 50 ° C, add 0.2 grams of methylene blue, stir well, and then add 10 kilograms of styrene and 20 grams of benzyl peroxide The oily phase formed after acyl mixing. Sampling was carried out to observe the dispersion of oil droplets, and the stirring speed was adjusted to make the particle size of the oil droplets uniform. After that, the temperature was gradually raised to 85° C., and kept at this temperature for 4 hours. After this process is completed, the temperature is raised to 95°C at a rate of 0.5-1°C per minute, and the temperature is maintained for 5 hours for aging. Then cool down to 80°C, filter, wash with water, and dry until the water content is less than 1%. Sieve to obtain a particle size of 0.8-1.2 mm to obtain 2.8 kg of transparent beads. ...

Embodiment 3

[0042] (1) Preparation of polystyrene spheres

[0043]Add 40 liters of pure water to a 100-liter polymerization kettle, add 20 grams of hydroxyethyl cellulose and 60 grams of tricalcium phosphate under stirring conditions, gradually raise the temperature to 50 ° C, add 0.4 grams of methylene blue, stir well, and then add 15 kilograms of benzene Ethylene and 45 grams of benzoyl peroxide mixed to form the oil phase. Take samples to observe the dispersion of oil beads, adjust the stirring speed to make the oil beads uniform in size, gradually raise the temperature to 75°C, and keep the temperature for 4 hours. At this stage, the oil beads gradually aggregate and solidify into beads. After this process is completed, the temperature is raised to 95°C at a rate of 0.5-1°C per minute, and the temperature is maintained for 8 hours.

[0044] Lower the temperature to below 80°C, press 150 grams of liquefied petroleum gas into the reactor, close the reactor, adjust the temperature to 10...

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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...

Claims

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Application Information

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IPC IPC(8): C08J9/14C08L25/06
Inventor 孟繁生王士贺
Owner LIAONING GEOLOGY ENG VOCATIONAL COLLEGE
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