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Method for preparing polyetherimide through continuous extrusion reaction

A technology of polyetherimide and extrusion reaction is applied in the field of preparing polyetherimide, which can solve the problems of low polymer viscosity, difficulty in adapting to mass production, and limited application range.

Active Publication Date: 2006-04-19
SHANGHAI PLASTICS RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If we talk about the aspects that still need to be improved, it is that the running time is more than 5 hours, the intrinsic viscosity of the polymer is only 0.44dl / g, and the feeding rate is only 227g / hr, which is difficult to adapt to mass production
Moreover, long running times will lead to polymer degradation, and low polymer viscosity also limits its application range

Method used

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  • Method for preparing polyetherimide through continuous extrusion reaction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 3640g (7 moles) of bisphenol A diether anhydride, 1400g (7 moles) of 4,4'-diaminodiphenyl ether and 218g of phthalic anhydride were mixed uniformly in a high-speed mixer, and added to the same rotation at a speed of 4kg / hr. In the feeding section of the meshed twin-screw reactor, the screw speed is 400r / min, and the temperature of this section is controlled at 200°C, and then the material is transferred to the melting section with a temperature of 290°C, where the material is kneaded and melted into a liquid, and the generated water is sucked The liquid is discharged to the atmosphere, and then the liquid is transported to the mass transfer section with a temperature of 305°C, and the resulting water is pumped and discharged to the atmosphere. 800g of glass fiber is introduced into the reactor from the reinforcing agent inlet, and transported together with the original material to the polymerization section with a temperature of 320°C. The material is subjected to 20 atm...

Embodiment 2

[0026] Use 3,4'-diaminodiphenyl ether instead of 4,4'-diaminodiphenyl ether, add 182g of chain terminator phthalic anhydride, feed at a rate of 5kg / hr, control the temperature of the feeding section at 150°C, and the temperature of the melting section at 300°C , the temperature in the mass transfer section is 310°C, carbon fiber is used instead of glass fiber, the addition amount is 1300g, the screw speed is 300r / min, the temperature in the polymerization section is 310°C, the pressure is 10 atmospheres, and the material residence time is 4.8min. Other operating steps and proportions are the same Same as Example 1, the resulting polyetherimide intrinsic viscosity is 0.55dl / g, tensile strength is 145MPa, compressive strength is 210MPa, elongation is 5%, impact strength is 70KJ / m 2 .

Embodiment 3

[0028] The addition of chain terminator phthalic anhydride is 356g, the feeding rate is 3kg / hr, the temperature of the feeding section is controlled at 272°C, the temperature of the melting section is 277°C, the temperature of the mass transfer section is 302°C, the screw speed is 550r / min, and the reinforcing agent is 1000g of glass powder and A mixture of 900g of carbon fiber powder, the temperature of the polymerization section is 330°C, the pressure is 30 atmospheres, and the residence time of the material is 1.6min. The other formula operation steps and proportioning are the same as in Example 1. Tensile strength 195MPa, compressive strength 215MPa, elongation 3%, impact strength 55KJ / m 2 .

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Abstract

In the preparation method, bisphenol A diether anhydride, aromatic diamine and chain stopper are added into feeding section of reactor; the added material is passed through melting section and mass transfering section then mixed with reinforcing agent of glass fibre at polymerizing section; polyether imide and water formed by reaction are separated out at reactor after high speed cutting and strong mixing are applied.

Description

technical field [0001] The present invention relates to the method for preparing polyetherimide by continuously extruding reactant with twin-screw reactor, more precisely relates to the continuous extrusion of polyetherimide based on bisphenol A diether anhydride and aromatic diamine with twin-screw reactor Process for preparing polyetherimides from reaction materials. Background technique [0002] Polyetherimide is relatively inexpensive to produce and is a mass-produced thermoplastic polyimide. Its processability is comparable to that of the high performance thermoplastics polyethersulfone and polysulfone. The characteristic properties of this amorphous thermoplastic polyetherimide are high strength, high modulus, moderate electrical properties, amber transparent color, inherent flame retardancy, moderate chemical resistance, excellent heat resistance, heat distortion temperature Above 200°C, the continuous use temperature is 170°C, and it is widely used in the world. S...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G73/10
Inventor 华向阳吕凯
Owner SHANGHAI PLASTICS RES INST CO LTD