A kind of magnetic graphite/polystyrene bead that reduces polymerization resistance and preparation method thereof

A technology of polystyrene pellets and polyvinylpyrrolidone, applied in the field of magnetic graphite/polystyrene pellets and its preparation, can solve problems such as difficult collection

Active Publication Date: 2021-03-05
WUHAN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to reduce the polymerization inhibition effect of graphite in the process of synthesizing graphite polystyrene by suspension polymerization method, and simultaneously solve the problem that polystyrene foam particles are difficult to collect after scattering

Method used

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  • A kind of magnetic graphite/polystyrene bead that reduces polymerization resistance and preparation method thereof
  • A kind of magnetic graphite/polystyrene bead that reduces polymerization resistance and preparation method thereof
  • A kind of magnetic graphite/polystyrene bead that reduces polymerization resistance and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] 1) Preparation of magnetic graphite with reduced inhibition of polymerization

[0048] Add 0.6g of polyvinylpyrrolidone and 100mL of distilled water to a three-necked flask equipped with a stirring paddle and a condenser tube. After stirring and dissolving, add 6.0g of graphite powder, stir to disperse evenly, and then mix according to the molar ratio of Fe 3+ : Fe 2+ =2:1 Add 4 mmol of ferric chloride and 2 mmol of ferrous chloride, and stir for 60 min to dissolve them. Adjust the rotation speed to 320rpm, add ammonia water to the above reaction system within 3 seconds to make the pH of the system 11, then heat in a water bath to 78°C, react for 45min, cool to room temperature, magnetically separate, wash with water until neutrally dispersed in 100mL of distilled water, Then, add 0.4g hydrophobic modifier oleic acid and 2.0mL ethanol, stir at 180rpm, heat in a water bath at 65°C, react for 40min, cool to room temperature, magnetically separate and dry to obtain hydrop...

Embodiment 2

[0051] 1) Preparation of magnetic graphite with reduced inhibition of polymerization

[0052] Add 0.7g of polyvinylpyrrolidone and 100mL of distilled water to a three-necked flask equipped with a stirring paddle and a condenser tube. After stirring and dissolving, add 7.0g of graphite powder, stir to disperse evenly, and then mix according to the molar ratio of Fe 3+ : Fe 2+ =2:1 Add 2 mmol of ferric sulfate and 2 mmol of ferrous sulfate, and stir for 8 min to dissolve them. Adjust the rotation speed to 350rpm, add ammonia water to the above reaction system within 3 seconds to make the pH of the system 11, then heat in a water bath to 79°C, react for 70min, cool to room temperature, magnetically separate, wash with water until neutrally dispersed in 100mL of distilled water, Then, add 0.7g of hydrophobic modifier vinyltrimethoxysilane and 2.0mL of ethanol, stir at 180rpm, heat in a water bath at 65°C, react for 65min, cool to room temperature, and dry by magnetic separation ...

Embodiment 3

[0055] 1) Preparation of magnetic graphite with reduced inhibition of polymerization

[0056] Add 1.0g of polyvinylpyrrolidone and 120mL of distilled water to a three-necked flask equipped with a stirring paddle and a condenser tube. After stirring and dissolving, add 8.0g of graphite powder, stir to disperse evenly, and then mix according to the molar ratio of Fe 3+ : Fe 2+ =2:1 Add 5 mmol of ferric nitrate and 2.5 mmol of ferrous nitrate, stir for 10 min to dissolve. Adjust the rotation speed to 360rpm, add the aqueous solution of sodium hydroxide to the above reaction system within 3 seconds to make the pH of the system 11.5, then heat the water bath to 80°C, react for 75min, cool to room temperature, magnetically separate, wash with water until neutrally dispersed in 100mL of distilled water, and sonicate in an ultrasonic cleaner for 11min, then add 0.8g of hydrophobic modifier methyltriethoxysilane and 2.5mL of ethanol, stir at 200rpm, heat in a water bath at 75°C, react...

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Abstract

The invention discloses a magnetic graphite / polystyrene ball with reduced polymerization resistance and a preparation method thereof. The preparation method comprises: 1) preparation of hydrophobic magnetized graphite; 2) preparation of magnetic graphite / polystyrene pellets which reduce and inhibit polymerization. The present invention aims at reducing the polymerization inhibition effect of graphite in the process of synthesizing graphite polystyrene by suspension polymerization method, forming a coating layer of ferric oxide on the graphite surface in situ, covering the polymerization inhibition groups on the graphite surface, and realizing reducing the polymerization inhibition effect of graphite The purpose of this method is to solve the problem of difficult collection of polystyrene foam particles at the same time. In the present invention, magnetized graphite is obtained by in-situ synthesis of ferroferric oxide nanoparticle coating layer on graphite surface by in-situ chemical co-precipitation method, and lipophilic magnetic graphite is prepared by adding hydrophobic modifier to the system for in-situ hydrophobic modification. Synthesis of magnetic graphite / polystyrene pellets with reduced inhibition by bit suspension polymerization.

Description

technical field [0001] The invention belongs to the technical field of energy-saving and thermal insulation materials, and more specifically relates to a magnetic graphite / polystyrene pellet with reduced polymerization resistance and a preparation method thereof. Background technique [0002] Graphite polystyrene board is a new type of flame-retardant ultra-low thermal conductivity foamed polystyrene insulation board, which is made by foaming graphite polystyrene, commonly known as "black benzene board". Generally, graphite polystyrene is prepared in two ways. The first is the preparation of non-spherical graphite polystyrene by melt blending extrusion method, which is usually prepared from graphite, polystyrene, additives and auxiliary agents. The second is the direct synthesis of graphite polystyrene beads by suspension polymerization, which is usually synthesized from graphite, styrene monomer, initiator, additive, water and auxiliary agent. The process of melt blending...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F112/08C08F2/20C08F2/44C08K9/04C08K9/10C08K3/04C08K3/22
CPCC08F112/08C08K3/22C08K9/04C08K9/10C08K2003/2275C08K3/042C08F2/20C08F2/44
Inventor 王春蕾闫俊涛胡黎明李建芬范国枝程群鹏宋光森
Owner WUHAN POLYTECHNIC UNIVERSITY
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