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Method and device for preparing microballoons by bi-dispersible inverse suspension polymerization

A reverse-phase suspension and double-dispersion technology, which is applied in the field of functional polymer microsphere preparation, can solve the problems of easy agglomeration and sticking to the kettle, and achieve the effect of avoiding adhesion and solving instability

Inactive Publication Date: 2013-06-12
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the instability of the inverse suspension polymerization system, scholars (CN102408505) increased the stability of the reaction system by selecting appropriate dispersants and thickeners, and strictly controlled the process conditions, but it is still prone to agglomeration and sticking. , did not really solve the problem from the process and equipment

Method used

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  • Method and device for preparing microballoons by bi-dispersible inverse suspension polymerization
  • Method and device for preparing microballoons by bi-dispersible inverse suspension polymerization
  • Method and device for preparing microballoons by bi-dispersible inverse suspension polymerization

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Experimental program
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Effect test

Embodiment 1

[0019] Dissolve 20g of acrylamide, 0.16g of potassium persulfate, 0.04g of sodium bisulfite (redox initiator), 0.04g of N,N-methylenebisacrylamide (crosslinking agent) in 120g of Distilled water, dubbed the reaction system (water phase). Take 1 part by volume of the reaction system, add it dropwise to 10 parts by volume of corn oil (oil phase), stir in a cold water bath at 10°C for 5 minutes, and the stirring speed is 200r / min, so that the reaction system can be dispersed into a certain particle size in the corn oil. Droplets form a dispersed system. After the stirring is finished, open the lid 16 of the kettle, inject the dispersion system into the reactor body 17 filled with 70 parts by volume of corn oil (used for sedimentation and dispersion) heated to 50°C in advance, the inner diameter of the reactor body 17 is 5cm, and the height is 2.5m. Sufficient settling distance can be provided for the microspheres to ensure the reaction time. The material of the reaction kettle b...

Embodiment 2

[0021] Dissolve 20g of acrylamide, 0.16g of potassium persulfate, 0.04g of sodium bisulfite (redox initiator), 0.04g of N,N-methylenebisacrylamide (crosslinking agent) in 120g of water in a cold water bath To form a reaction system, take 1.5 parts of the reaction system, add it to 10 parts of corn oil, and stir in a cold water bath for 5 minutes at a stirring speed of 250 r / min. After the stirring is completed, pour it into a reactor filled with 70 parts of corn oil, set the temperature at 50°C, and react for 3 hours. After the reaction is completed, open the valve, filter out the microspheres with a 400-mesh sieve, wash them, and dry them. The ball is denoted as sample 2, such as image 3 As can be seen from the figure, the microspheres have no adhesion, the particle size is relatively uniform, and the average particle size is 50 μm.

[0022] Compared figure 2 and image 3 It can be seen that when the volume ratio of the water phase to the oil phase and the stirring rate ...

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Abstract

The invention discloses a method and a device for preparing microballoons by bi-dispersible inverse suspension polymerization. The first dispersion is carried out in an agitating manner; the particle sizes of the microballoons are determined by the volume ratio of a water phase and an oil phase and the agitating speed; second dispersion is carried out by a gravity sedimentation method; adhesion generated by collision of the microballoons caused by agitation at middle and later periods of the reaction can be effectively avoided without adding a dispersing agent; and the instability of a reaction system is solved from the process and equipment.

Description

technical field [0001] The invention relates to a method and a device for preparing microspheres by double-disperse reverse-phase suspension polymerization, and belongs to the technical field of preparation of functional polymer microspheres. Background technique [0002] The research and application of polymer microspheres have developed rapidly in recent years. Due to their special size and shape, polymer microspheres have special functions that other materials do not have. Widely used in drug carrier, petroleum exploration, daily chemical industry, environmental protection and food processing and other fields. [0003] Inverse suspension polymerization is a relatively mature method for preparing water-absorbing microspheres. It is a method of dispersing a water-soluble monomer (or its aqueous solution) in the continuous medium-oil phase in the presence of a surfactant for polymerization. This method has the advantages of mild reaction conditions, less side reactions, et...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F2/32C08F2/01
Inventor 柳华杰步玉环郭胜来王春雨王银东
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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