Preparation method of PET / magnetic Fe3O4 functional nanocomposite material

A technology of functional nano-composite materials, applied in the field of preparation of PET/magnetic Fe3O4 functional nano-composite materials, which can solve the impact of shielding material mechanical strength and molding processing performance, poor compatibility between magnetic powder and polymer, easy aggregation of nano inorganic magnetic powder, etc. problems, to achieve the effect of toughening electromagnetic shielding, protecting the environment and human health, and preventing electromagnetic wave radiation pollution

Active Publication Date: 2014-03-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To make the material have a good shielding effect, the filling amount of the added filler needs to be high, but at the same time, the mechanical strength and molding processability of the shielding material will be affected
The method of directly adding nano-inorganic magnetic powder to the polymer to form a film, because of the high surface energy of the nano-particles and the existence of magnetic attraction between the magnetic powders, the nano-inorganic magnetic powder is easy to aggregate and difficult to uniformly disperse in the organic phase
In addition, due to the huge difference in the properties of the inorganic dispersed phase and the organic continuous phase, the compatibility of magnetic powder and polymer is poor

Method used

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  • Preparation method of PET / magnetic Fe3O4 functional nanocomposite material
  • Preparation method of PET / magnetic Fe3O4 functional nanocomposite material
  • Preparation method of PET / magnetic Fe3O4 functional nanocomposite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] In a 2.5-liter polymerization reactor, 400 g of purified terephthalic acid, 220 g of ethylene glycol, modified Fe 3 o 4 Nanoparticles 0.19g, antimony acetate 0.12g, high-purity nitrogen replacement three times, adjust the initial pressure to 0.1MPa, heat up and stir. The esterification reaction is carried out at a pressure of 0.15-0.40Mpa and a temperature of 180-240°C. When the amount of distilled water in the esterification reaction reaches 80-100 grams, the pressure is released to end the esterification reaction, and the temperature is raised and the pressure is reduced. The polycondensation is carried out at an absolute pressure of 20-120 Pa and a temperature of 260-290° C., and the end point of the polycondensation reaction is determined according to the current change of a stirring motor to obtain PET slices.

Embodiment 2

[0042] In a 2.5-liter polymerization reactor, 400 g of purified terephthalic acid, 220 g of ethylene glycol, modified Fe 3 o 4 0.37g of nanoparticles and 0.12g of antimony acetate were replaced with high-purity nitrogen three times, and the initial pressure was adjusted to 0.1MPa, heated and stirred. The esterification reaction is carried out at a pressure of 0.15-0.40Mpa and a temperature of 180-240°C. When the amount of distilled water in the esterification reaction reaches 80-100 grams, the pressure is released to end the esterification reaction, and the temperature is raised and the pressure is reduced. The polycondensation is carried out at an absolute pressure of 20-120 Pa and a temperature of 260-290° C., and the end point of the polycondensation reaction is determined according to the current change of a stirring motor to obtain PET slices.

Embodiment 3

[0044] In a 150-liter polymerization reactor, 60Kg of purified terephthalic acid, 34Kg of ethylene glycol, modified Fe 3 o 4 13.88g of nanoparticles and 18g of antimony acetate were replaced with high-purity nitrogen three times, and the initial pressure was adjusted to 0.1MPa, heated and stirred. The esterification reaction is carried out at a pressure of 0.15-0.40Mpa and a temperature of 180-240°C. When the amount of distilled water in the esterification reaction reaches 13-16Kg, the pressure is released to end the esterification reaction, and the temperature is raised and the pressure is reduced. The polycondensation is carried out at an absolute pressure of 20-200 Pa and a temperature of 260-290° C., and the end point of the polycondensation reaction is determined according to the current change of a stirring motor to obtain PET slices.

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Abstract

The invention provides a preparation method of a PET / magnetic Fe3O4 functional nanocomposite material. The preparation method is as below: first preparing magnetic Fe3O4 nanoparticles by a co-precipitation method; and then conducting surface modification on magnetic Fe3O4 nanoparticles with KH550, so that the surface of Fe3O4 magnetic nanoparticles are grafted with active functional groups and that modified Fe3O4 magnetic nanoparticles can organically bind with PET molecular chains. Addition of modified Fe3O4 magnetic nanoparticles with different proportion in an esterification process of PET esterification polycondensation and adjustment of the addition amount of the modified Fe3O4 magnetic nanoparticles can obtain uniformly dispersed PET / magnetic Fe3O4 functional nanocomposite material with good reinforcement, toughening and electromagnetic shielding effects. A film prepared from the modified PET / magnetic Fe3O4 functional nanocomposite material has magnetic shielding effectiveness reaching a highest value -52 dB and an average value about -32 dB.

Description

technical field [0001] The invention belongs to the synthesis of functional PET polyester, in particular to a PET / magnetic Fe 3 o 4 Preparation methods of functional nanocomposites. Background technique [0002] With the development of the electronic industry and the increasing application of various electronic devices, the problems of electromagnetic interference (EMI) and electromagnetic compatibility (EMC) caused by electromagnetic waves are becoming more and more serious. At present, strong electromagnetic wave radiation from radio and television transmission towers, electromagnetic radiation pollution near urban electricians and medical radio frequency equipment, and electromagnetic wave radiation from audio-visual equipment, computers, air conditioners, microwave products, and mobile phones have attracted widespread attention. The damage caused by electromagnetic radiation to people's living environment and production environment is becoming more and more serious. At...

Claims

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Application Information

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IPC IPC(8): C08L67/02C08K9/06C08K3/22C08G63/183
Inventor 李乃祥华道本庞道双潘晓娣曹金鑫
Owner CHINA PETROLEUM & CHEM CORP
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