Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Preparation method of semi-aromatic polyamide

A semi-aromatic and polyamide technology, applied in the field of semi-aromatic polyamide preparation, can solve the problems that the low-temperature solution polycondensation method is not suitable for industrialized large-scale production, high requirements for reaction equipment, and inability to operate continuously, etc., achieving low cost , Low production cost, easy to recycle

Active Publication Date: 2019-06-07
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
View PDF10 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The patent US6355769 uses a low-temperature solution polycondensation method to prepare polyamide, but this method needs to use a large amount of organic solvents, the cost is high, the requirements for reaction equipment are high, and continuous operation is not possible, so the low-temperature solution polycondensation method is not suitable for large-scale industrial production

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 method of semi-aromatic polyamide
  • Preparation method of semi-aromatic polyamide
  • Preparation method of semi-aromatic polyamide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The preparation of semiaromatic polyamide comprises the steps:

[0048] 1mol (ie 166.13g) terephthalic acid, 1.01mol (ie 174.05g) decanediamine, 0.01mol (ie 1.22g) benzoic acid, 0.34g sodium hypophosphite, 1.00g N,N'-bis-( Add 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hexamethylenediamine and 510g deionized water into the high-temperature and high-pressure polymerization reactor, replace the air in the reactor with nitrogen for 10 times, start stirring, and The temperature is 100rpm, the temperature is raised to 80°C within 0.5h, and the salt-forming reaction is carried out at a constant temperature. The time of the salt-forming reaction is 1h; after the completion of the salt-forming reaction, the temperature is raised to 220°C within 2h, during which the pressure is controlled by discharging the gas in the kettle No more than 2.8MPa, pre-polymerization at constant temperature, the time of the pre-polymerization is 0.5h, after the completion of the pre-polymerizat...

Embodiment 2

[0051] For the preparation of semi-aromatic polyamide, the method steps are the same as in Example 1, except that the rotational speed of the agitator is changed to 120 rpm. The product performance test results are shown in Table 1.

Embodiment 3

[0053] The preparation of the semi-aromatic polyamide is the same as in Example 1, except that the prepolymerization temperature is changed to 210°C. The product performance test results are shown in Table 1.

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 invention discloses a preparation method of semi-aromatic polyamide. The preparation method comprises the following steps: 1) raw materials are placed in a reaction device and undergo a salt-forming reaction, wherein the raw materials comprise a diacid, an aliphatic diamine, a catalyst, deionized water, an antioxidant and an end capping agent; 2) a product prepared in step 1) undergoes a prepolymerization reaction to obtain a semi-aromatic polyamide prepolymer; and 3) the semi-aromatic polyamide prepolymer obtained in step 2) is subjected to a solid phase polymerization reaction to obtainthe semi-aromatic polyamide. The preparation method provided by the invention has the advantages of simple reaction steps, implementation of the prepolymerization reaction and the solid phase polymerization reaction in the same reaction device, and realization of continuous production; and the solid phase polymerization is carried out to increase the molecular weight of the polymer to obtain the semi-aromatic polyamide, so the production cost is low, and the quality of the product is easily controlled by solid phase polymerization conditions.

Description

technical field [0001] The invention relates to the technical field of polymer synthesis. More specifically, it relates to a method for preparing semi-aromatic polyamides. Background technique [0002] Semi-aromatic polyamide is prepared by polycondensation of aromatic diacid or diamine and aliphatic diamine or diacid. Due to the introduction of aromatic rings in the molecular chain, compared with common aliphatic polyamides, semi-aromatic polyamides have significantly improved mechanical properties and heat resistance, and have a high melting point of 290-320 degrees Celsius. It is a special engineering plastic between general engineering plastics and high temperature resistant polyether ether ketone. In addition, semi-aromatic polyamides also have excellent dimensional stability, abrasion resistance, corrosion resistance and aging resistance. In recent years, with the rapid development of the automotive industry, aerospace, electronics, military and other fields, the ma...

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
IPC IPC(8): C08G69/26C08G69/28
Inventor 邹光继王萍丽冯梧桐艾天浩任中来季君晖
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
Features
  • Generate Ideas
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com