Preparation of polyisophthaloyl m-phenylene diamide spinning solution by using semi-continuous twin screw extruder

A technology of polym-phenylene isophthalamide spinning and isophthaloyl chloride, which is applied in the direction of spinning solution preparation, single-component polyamide artificial filament, etc., and can solve the problem that equimolar ratio is difficult to grasp, reaction Heat is not easy to remove, filtration is difficult, etc., to avoid the effect of molecular weight inhomogeneity

Inactive Publication Date: 2006-07-19
DONGHUA UNIV +1
View PDF4 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can produce a spinning solution with low salt content, it will be difficult to filter when the molecular weight of the polymer is high
[0011] Moreover, solution polymerization basically adopts a discontinuous method, the heat of reaction is not easy to remove, and local overheating can easily lead to differences in molecular weight.
The continuous polymerization method disclosed in U.S. Patent No. 3287324 adopts the one-time feeding method of acid chloride, which has the disadvantage that the equimolar ratio is difficult to grasp

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
  • Preparation of polyisophthaloyl m-phenylene diamide spinning solution by using semi-continuous twin screw extruder
  • Preparation of polyisophthaloyl m-phenylene diamide spinning solution by using semi-continuous twin screw extruder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Dissolve one part of refined MPD in 8.7 parts of freshly distilled dry DMAC, add 1.7 parts of 60 °C refined IPC at -10 °C for prepolymerization to form a prepolymer containing hydrogen chloride, keep the temperature below 0 °C , After reacting for 20 minutes, add 0.27 parts of dry liquid ammonia under stirring at 0°C and keep it for 20 minutes to precipitate most of the hydrogen chloride, then press filter to remove the ammonium chloride crystals generated by the reaction, and keep the filtration temperature not exceeding 10°C . The filtrate and the remaining 0.177 parts of IPC enter a twin-screw extruder with a diameter of 25 mm, an aspect ratio of 1:40, and a rotational speed of 200 rpm, and the IPC is added in a molten state. Control the temperature of the twin-screw reactor below 50°C, extrude a colorless and transparent polymer for about 12 minutes, and then carry out the second neutralization, Ca(OH) 2 The amount is 0.084 parts. Finally, a polymer containing 19....

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

No PUM Login to view more

Abstract

The semi-continuous twin screw preparation method of polyisophthaloyl m-phenylene diamide spinning solution uses twin screw extruder as main reactor and adopts the isophthaloyl dichloride double-charged and dried liquid ammonia as preveutralizing agent. The application of twin-screw extruder is favorable for system radiation problem, and prevents non-uniformity of polymer molecular weight distribution, and also id favorable for partially removing small molecular by-product in the polymerization system-hydrogen chloride gas. The length-to-diameter ratio of the twin-screw extruder is greater than 1:30. Said preparation method includes prepolymerization, preneutralization, filtration, polymerization and neutralization.

Description

technical field [0001] The invention relates to a semi-continuous twin-screw preparation of polym-phenylene isophthalamide spinning solution, more precisely, the preparation of poly-m-phenylene isophthalamide with a twin-screw extruder as the main reactor Amine spinning solution method. Background technique [0002] Polym-phenylene isophthalamide has excellent heat resistance and flame resistance, as well as excellent high-temperature electrical insulation properties, and is used to prepare fire-resistant and flame-resistant materials and high-use temperature insulating materials, such as fibers and paper. [0003] The existing method for preparing polym-phenylene isophthalamide is usually: [0004] 1) Interface polymerization [0005] m-Phenylenediamine and isophthaloyl chloride are reacted in a poor solvent of polym-phenylene isophthalamide, such as tetrahydrofuran, and then mixed with an aqueous solution containing an acid absorbent at a high speed, and the poly The po...

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): D01D1/02D01F6/60
Inventor 陈蕾扈益民刘兆峰朱富文胡祖明潘婉莲
Owner DONGHUA UNIV
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