A method for preparing soluble polyimide by induction heating of magnetic particles

A soluble polyimide and induction heating technology, applied in the field of preparation of soluble polyimide, can solve the problems of long imidization cycle, unstable resin performance, slow heating and heating rate, etc., to avoid temperature instability, Improved stability and consistent response

Active Publication Date: 2017-01-04
INST OF PETROCHEM HEILONGJIANG ACADEMY OF SCI
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention solves the instability of the resin performance caused by the uneven heating of the external heat source during the imide cyclization process of the soluble polyimide precursor-polyamic acid, and the heating and heating The problem of slow rate and long imidization period, and a method for preparing soluble polyimide by induction heating of magnetic particles

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A method for preparing soluble polyimide by induction heating of magnetic particles
  • A method for preparing soluble polyimide by induction heating of magnetic particles
  • A method for preparing soluble polyimide by induction heating of magnetic particles

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0038] Specific implementation mode one: combine Figure 5 Specifically illustrate this embodiment, a method for preparing soluble polyimide by induction heating of magnetic particles described in this embodiment is carried out according to the following steps:

[0039] 1. ①. Under nitrogen atmosphere, room temperature and stirring conditions, add high boiling point polar solvent and aromatic diamine into the three-necked flask, react for 0.5h~1h, then add aromatic dianhydride into the three-necked flask, react for 1h~ 5h, then add tertiary amine into the three-necked flask, react for 2h~3h, stop stirring to get the reaction solution, under stirring condition, drop the reaction solution into acetone at the speed of 2mL / s~10mL / s, the dropwise addition is completed Afterwards, continue to stir for 1h-6h, then stand still for 3 days to 10 days to obtain a standing liquid containing filaments, take out the filaments in the standing liquid containing filaments, Dry the filaments i...

specific Embodiment approach 2

[0063] Embodiment 2: This embodiment differs from Embodiment 1 in that: the permanent magnet described in Step 4 has a magnetic induction of 0.1 tesla to 1.5 tesla. Others are the same as in the second embodiment.

specific Embodiment approach 3

[0064] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that: the water-carrying agent described in step 2 is one of toluene and xylene or a mixture of two of them. Others are the same as in the first or second embodiment.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
Login to view more

Abstract

The invention discloses a method for preparing soluble polyimide by adopting magnetic particle induction heating and relates to a method for preparing the soluble polyimide. The invention solves the problems of unstable resin performance, slow heating speed and long imidization period caused by the heating differences of the outer heat source in the imide cyclization process of the soluble polyimide precursor-polyamide acid when preparing the soluble polyimide. The preparation method comprises the following steps: firstly preparing a high magnetic response polyimide / Fe3O4 compound magnetic nano-particle, heating the soluble polyamide acid solution, a water-carrying agent and the high magnetic response polyimide / Fe3O4 compound magnetic nano-particle in a high frequency induction heating device, precipitating, filtering, depositing, rinsing and baking. The method is used for preparing the soluble polyimide by adopting a magnetic particle induction heating device.

Description

technical field [0001] The invention relates to a preparation method of soluble polyimide. Background technique [0002] Polyimide is an aromatic heterocyclic polymer containing imide rings in repeating structural units. It is one of the highest heat-resistant polymer materials used in the industrial field so far. , resin, fiber, separation membrane and other forms are widely used in aerospace, electronics and other fields. Traditional polyimides usually use aromatic tetracarboxylic anhydride and aromatic diamine as raw materials to form polyamic acid first, and then imidize and dehydrate to form polyimide. Common imidization methods include thermal imidization. And chemical imidization method, has a good application basis. However, the existing thermal imidization reaction cycle is long, which will greatly increase energy consumption. For example, the thermal imidization reaction of polyimide in the patent CN101985498B undergoes 10-12h reflux reaction at 170-190°C, slow t...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): C08G73/10
Inventor 刘长威曲春艳王德志宿凯张杨冯浩李洪峰杨海东王海民
Owner INST OF PETROCHEM HEILONGJIANG ACADEMY OF SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap