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Preparation process of porous polypropylene microparticle

A technology of polypropylene and microparticles, which is applied in the field of preparing porous polypropylene microparticles, and can solve problems such as the inability to obtain porous high polymers, the complexity of the polymerization reaction system, and the lack of industrialized methods for porous polypropylene.

Inactive Publication Date: 2009-02-25
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this method is that the polymerization reaction system is complicated, and many factors such as monomer, crosslinking agent, porogen, initiator and water composition need to be controlled, otherwise the required porous polymer cannot be obtained.
In actual production, the suspension polymerization method used in the polypropylene industry is mainly used to produce powdered polypropylene masterbatch, rather than porous polypropylene particles. Therefore, there is no industrialized method for preparing porous polypropylene.

Method used

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  • Preparation process of porous polypropylene microparticle
  • Preparation process of porous polypropylene microparticle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Add 800 L of chloroform and 6 kg of Span 80 to both 2000 L enamel reaction kettles A and B, start stirring, so that Span 80 is evenly dissolved in the chloroform. Then, put 36kg of isotactic or syndiotactic polypropylene into the reactor A, gradually increase the temperature to 100°C-120°C while stirring, and keep it warm for 1 hour, so that the polypropylene is completely dissolved in chloroform to form a polypropylene solution . While the materials in the reactor A are kept warm, circulate cooling water into the jacket of the reactor B to keep the temperature of the solution in the kettle below 20°C for standby use.

[0022] After the insulation of the polypropylene solution in the reactor A is completed, the solution is maintained at the insulation temperature, and then, the bottom valve of the reactor A is opened, and the polypropylene solution is transferred from the bottom of the reactor B to the reactor B through the pipeline by the pressure difference. Under th...

Embodiment 2

[0025] Add 800 L of chloroform and 60 kg of Span 80 to both 2000 L enamel reactors A and B, and start stirring to make Span 80 evenly dissolve in the chloroform. Then, put 360kg of isotactic or syndiotactic polypropylene into the reactor A, gradually increase the temperature to 110°C-120°C while stirring, and keep it warm for 2 hours, so that the polypropylene is completely dissolved in chloroform to form a polypropylene solution . While the materials in the reactor A are kept warm, circulate cooling water into the jacket of the reactor B to keep the temperature of the solution in the kettle below 20°C for standby use.

[0026] After the insulation of the polypropylene solution in the reactor A is completed, the solution is maintained at the insulation temperature, and then, the bottom valve of the reactor A is opened, and the polypropylene solution is transferred from the bottom of the reactor B to the reactor B through the pipeline by the pressure difference. Under the cond...

Embodiment 3

[0029] Add 800 L of chloroform and 12 kg of Span 80 to both 2000 L enamel reactors A and B, and start stirring to make Span 80 evenly dissolve in the chloroform. Then, put 120kg of isotactic or syndiotactic polypropylene into the reactor A, gradually increase the temperature to 110°C-120°C while stirring, and keep it warm for 2 hours, so that the polypropylene is completely dissolved in chloroform to form a polypropylene solution . While the materials in the reactor A are kept warm, circulate cooling water into the jacket of the reactor B to keep the temperature of the solution in the kettle below 20°C for standby use.

[0030] After the insulation of the polypropylene solution in the reactor A is completed, the solution is maintained at the insulation temperature, and then, the bottom valve of the reactor A is opened, and the polypropylene solution is transferred from the bottom of the reactor B to the reactor B through the pipeline by the pressure difference. Under the cond...

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Abstract

The present invention relates to superfine polymer powder material, and is especially the preparation process of superfine porous polypropylene powder. The preparation process includes mixing polypropylene material, pore forming agent and organic solvent in reactor A, heating to 100-150 deg.c and maintaining for 1-10 hr; controlling the temperature of the same organic solvent in the reactor B below room temperature; adding the polypropylene solution from the reactor A to the reactor B and lowering the temperature to room temperature; liquid-solid separation and vacuum drying to obtain the superfine porous polypropylene powder. The superfine porous polypropylene powder has specific surface area of 2-130 sq m / g, pore size of 100-200 nm and particle size of 1-10 micron, and may be used in preparing adsorbing polymer resin, modifying resin, etc.

Description

technical field [0001] The invention relates to the field of polymer ultrafine powder materials, and relates to a production method for controlling the crystallization and granulation process of polypropylene by physical methods to prepare porous polypropylene particles. Background technique [0002] At present, the main method for industrially preparing porous polymer particles is suspension polymerization. This method is to prepare porous polymer particles by controlling the polymerization reaction system and adding a suitable porogen in the process of polymerizing polymer monomers to form polymers. The disadvantage of this method is that the polymerization reaction system is complicated, and many factors such as monomer, crosslinking agent, porogen, initiator and water composition need to be controlled, otherwise the desired porous polymer cannot be obtained. In actual production, the suspension polymerization method used in the polypropylene industry is mainly used to p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/12C08J3/12C08J9/28
Inventor 李春喜陆颖舟谭魁龙孙爱军
Owner BEIJING UNIV OF CHEM TECH
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