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A method for preparing polymer hollow microspheres with large diameter and high sphericity

A technology of high sphericity and hollow microspheres, which is applied in the preparation of microspheres and microcapsule preparations, etc., can solve the problems of complex devices, large injuries to operators, and large amount of FB, so as to delay the curing speed, inhibit diffusion, and promote spherical shape effect

Inactive Publication Date: 2019-04-26
LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the device for introducing FB steam is complicated, and the amount of FB is large, which will cause great harm to operators.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0032] This embodiment includes the following steps:

[0033] 2a. Polystyrene and benzene are configured into an oil phase O with a concentration of 12wt% in a mass ratio of 12:88;

[0034] 2b. Prepare a polyacrylic acid aqueous solution with a concentration of 0.05wt% as the external water phase W2;

[0035] 2c. Using distilled water as the inner water phase W1, using microfluidic technology to produce W1 / O / W2 double emulsions with an inner diameter of 1900 μm and an outer diameter of 2400 μm;

[0036] 2d. Collect the W1 / O / W2 double emulsion prepared in step c in a flat-bottomed cylindrical flask containing the external aqueous phase W2 and 150 benzene droplets with a diameter of 2400 μm. Seal the flat-bottomed cylindrical flask and fix it horizontally on a rotary evaporator On the instrument, the rotation speed is 5rpm~60rpm, and the curing process is performed until the W1 / O / W2 double emulsion particles are solidified to form polystyrene microspheres;

[0037] 2e. Collect...

Embodiment 3

[0042] This embodiment includes the following steps:

[0043] 3a. Polystyrene and fluorobenzene are configured into an oil phase O with a concentration of 18wt% in a mass ratio of 18:82;

[0044] 3b. Prepare a polyacrylic acid aqueous solution with a concentration of 0.04wt% as the external water phase W2;

[0045] 3c. Using distilled water as the inner water phase W1, using microfluidic technology to produce W1 / O / W2 double emulsions with an inner diameter of 1900 μm and an outer diameter of 2400 μm;

[0046] 3d. Collect the W1 / O / W2 double emulsion prepared in step c in a flat-bottomed cylindrical flask containing the outer aqueous phase W2 and 300 FB droplets with a diameter of 2400 μm. Seal the flat-bottomed cylindrical flask and fix it horizontally on a rotary evaporator. On the instrument, the rotation speed is 5rpm~60rpm, and the curing process is performed until the W1 / O / W2 double emulsion particles are solidified to form polystyrene microspheres;

[0047] 3e. Collect ...

Embodiment 4

[0052] This embodiment includes the following steps:

[0053] 4a. Polystyrene and toluene are configured into an oil phase O with a concentration of 12wt% in a mass ratio of 12:88;

[0054] 4b. Prepare a polyvinyl alcohol aqueous solution with a concentration of 2wt% as the external water phase W2;

[0055] 4c. Using distilled water as the inner water phase W1, using microfluidic technology to produce W1 / O / W2 double emulsions with an inner diameter of 1900 μm and an outer diameter of 2400 μm;

[0056] 4d. Collect the W1 / O / W2 double emulsion particles prepared in step c using a flat-bottomed cylindrical flask containing the external water phase W2, seal the flat-bottomed cylindrical flask, and fix it horizontally on a rotary evaporator with a rotation speed of 5rpm~60rpm, and solidify Treat until the W1 / O / W2 double emulsion solidifies to form polystyrene microspheres;

[0057] 4e. Collect the cured polystyrene microspheres, wash them with distilled water, put the cleaned poly...

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Abstract

The invention discloses a method for preparing large-diameter high-sphericity polymer hollow micro-spheres. The method has the advantages that curing speed reducing and rotary curing processes are organically combined with one another, curing containers are sealed in procedures for preparing polymer hollow micro-spheres by the aid of microfluidic technologies, the quantities of dual-emulsion particles in external water phases and the quantities of preliminarily added organic solvents are changed, diffusion of the organic solvents towards the external water phases can be suppressed by the aid of the solubility of the organic solvents in the external water phases, the curing speeds of dual-liquid droplet can be reduced, and spheroidization of the dual-emulsion particles can be promoted; horizontal inclination angles, rotation modes and the rotational speeds of rotary flasks are controlled, accordingly, dispersion states of the dual-emulsion particles in the external water phases can be controlled, adhesion, coalescence and emulsion breaking of the dual-emulsion particles due to mutual collision can be prevented, non-spheroidization tendency of the dual-emulsion particles can be lowered, and the large-diameter high-sphericity polymer hollow micro-spheres can be prepared; the large-diameter high-sphericity polymer hollow micro-spheres can be applied to laser inertial confinement fusion physical experiments.

Description

technical field [0001] The invention belongs to the field of polymer processing and molding, and in particular relates to a method for preparing polymer hollow microspheres with large diameter and high sphericity. Background technique [0002] With the increasing shortage of global energy and the increasing energy demand, the experimental research of inertial confinement fusion (ICF), which is one of the most promising ways to realize controllable nuclear fusion, has attracted the attention of advanced countries such as the United States. In ICF physical experiments, polymer hollow microspheres are used as fuel containers. The sphericity and surface finish of their geometric shapes are related to key parameters such as laser absorption, coupling, and implosion symmetry and uniformity. has a pivotal role. Therefore, the requirements for the sphericity index of microspheres used in ICF physics experiments are extremely stringent. [0003] At present, the preparation of large...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J13/02
CPCB01J13/02
Inventor 陈素芬刘梅芳陈强李洁刘一杨李婧苏琳李波漆小波张占文初巧妹史瑞廷黄勇冯建鸿
Owner LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS
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