Method for Avoiding Cracking of Polystyrene Hollow Microspheres in Drying Process

A polystyrene microsphere and polystyrene technology, applied in the direction of coating, can solve the problems of reduced mechanical properties, narrowed application field, increased surface roughness, etc.

Active Publication Date: 2020-03-24
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

The surface roughness of these cracked polystyrene hollow microspheres will increase, the mechanical properties will decrease, and the application fields will narrow

Method used

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  • Method for Avoiding Cracking of Polystyrene Hollow Microspheres in Drying Process
  • Method for Avoiding Cracking of Polystyrene Hollow Microspheres in Drying Process
  • Method for Avoiding Cracking of Polystyrene Hollow Microspheres in Drying Process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A method for avoiding cracking of polystyrene hollow microspheres during drying, comprising the following steps:

[0033] Step 1. Add polyvinyl alcohol aqueous solution with a mass fraction of 1% into the rotary evaporator of the rotary evaporator, and then place the water-containing polystyrene microspheres in the rotary evaporator; set the temperature of the rotary evaporator to 75 ° C, rotate The speed is 25 rpm for 3 hours, and the solution containing polystyrene hollow microspheres is poured into a grading sieve to obtain high-temperature cured microspheres; the weight ratio of the polystyrene microspheres and polyvinyl alcohol aqueous solution is 1:10 ;

[0034] Step 2. Wash the high-temperature solidified microspheres with distilled water several times, then place them in ethanol for full exchange for 1 hour, discard the microspheres that sink to the bottom of the ethanol, and collect the microspheres that float on the surface of ethanol;

[0035] Step 3, drying...

Embodiment 2

[0038] A method for avoiding cracking of polystyrene hollow microspheres during drying, comprising the following steps:

[0039] Step 1. Add polyvinyl alcohol aqueous solution with a mass fraction of 5% into the rotary evaporator of the rotary evaporator, then place the water-containing polystyrene microspheres in the rotary evaporator; set the temperature of the rotary evaporator to 100 ° C, rotate The speed is 45rpm for 5h, and the solution containing polystyrene hollow microspheres is poured into a grading sieve to obtain high-temperature cured microspheres; the weight ratio of the polystyrene microspheres and polyvinyl alcohol aqueous solution is 1:50 ;

[0040] Step 2. Wash the high-temperature solidified microspheres with distilled water several times, then place them in ethanol for full exchange for 3 hours, discard the microspheres that sink to the bottom of the ethanol, and collect the microspheres that float on the surface of ethanol;

[0041] Step 3, drying the colle...

Embodiment 3

[0044] A method for avoiding cracking of polystyrene hollow microspheres during drying, comprising the following steps:

[0045] Step 1, take a mass fraction of 3% polyvinyl alcohol aqueous solution and add it to the rotary evaporator of the rotary evaporator, then place the water-containing polystyrene microspheres in the rotary evaporator; set the temperature of the rotary evaporator to 85 ° C, rotate The speed is 35rpm for 4h, and the solution containing polystyrene hollow microspheres is poured into a grading sieve to obtain high-temperature cured microspheres; the weight ratio of the polystyrene microspheres containing water to the polyvinyl alcohol aqueous solution is 1:30 ;

[0046] Step 2. Wash the high-temperature solidified microspheres with distilled water several times, then place them in ethanol for full exchange for 2 hours, discard the microspheres that sink to the bottom of the ethanol, and collect the microspheres that float on the surface of ethanol;

[0047...

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Abstract

The invention discloses a method for avoiding cracking of hollow polystyrene microspheres in the drying process. The method comprises the following steps: adding an aqueous polyvinyl alcohol solution into a rotary evaporation bottle of a rotary evaporator, then putting water-containing polystyrene microspheres into the rotary evaporation bottle, and treating to obtain high-temperature cured microspheres; cleaning the high-temperature cured microspheres with distilled water for many times, then placing into ethanol for full exchange, discarding microspheres sinking at the bottom of the ethanol and collecting microspheres floating on the surface of the ethanol; drying the collected microspheres floating on the surface of the ethanol to obtain the hollow polystyrene microspheres; and thermally treating microspheres with fine cracks at high temperature to obtain crack-free hollow polystyrene microspheres. The crack-free hollow polystyrene microspheres prepared by adopting the method provided by the invention have excellent surface quality and mechanical property parameters, and are widely applied to the field of slow / controlled medicine release systems, chromatographic separation, catalysts, microreactors, optoelectronic materials, colloidal crystal templates, high-energy physical experiments and the like.

Description

technical field [0001] The invention relates to a method for avoiding cracking of polystyrene hollow microspheres in the drying process, and belongs to the field of polymer processing and molding. Background technique [0002] Non-cracked polystyrene hollow microspheres have large specific surface area, strong adsorption, solvent resistance, good surface permeability and large internal space, so they are widely used in drug sustained / controlled release systems, chromatographic separation, catalysts, microspheres, etc. Reactors, optoelectronic materials, colloidal crystal templates, and high-energy physics experiments. At present, polystyrene-based hollow microspheres are cured at a temperature of 20°C to 65°C, and then directly placed in an oven for drying. Most of the obtained polystyrene-based hollow microspheres have cracks, such as figure 2 shown. The surface roughness of these cracked polystyrene hollow microspheres will increase, the mechanical properties will decrea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/28C08J9/36C08J3/12C08L25/06
CPCC08J3/12C08J9/28C08J9/36C08J2201/048C08J2201/0482C08J2201/05C08J2201/0502C08J2325/06
Inventor 潘大伟刘梅芳陈强陈素芬李洁史瑞廷李波张占文
Owner LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS
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