Unlock instant, AI-driven research and patent intelligence for your innovation.

Semi-aromatic polyamide resin and method for manufacturing same

A polyamide resin, semi-aromatic technology, applied in the field of semi-aromatic polyamide resin, can solve the problems of poor quality, polluted mold productivity, etc., and achieve excellent heat resistance and heat discoloration resistance, melt fluidity and coagulation Excellent gelation properties and mechanical properties, and the effect of suppressing mold contamination

Pending Publication Date: 2021-07-23
TOYO TOYOBO CO LTD
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Among these proposals, although improvements have been made in terms of color tone stability and gelation, there are still problems in terms of polluting the mold due to gas generated during melt molding and thus poor productivity

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
  • Semi-aromatic polyamide resin and method for manufacturing same
  • Semi-aromatic polyamide resin and method for manufacturing same
  • Semi-aromatic polyamide resin and method for manufacturing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0115] 8.66kg (74.5 moles) of 1,6-hexamethylenediamine, 12.24kg (73.7 moles) of terephthalic acid, 7.99kg (39.7 moles) of 11-aminoundecanoic acid, 30.4g Sodium hypophosphite as a catalyst, 95.8 g (1.6 mol) of acetic acid as a capping agent, and 16.20 kg of ion-exchanged water bubbled with nitrogen to adjust the concentration of dissolved oxygen to 0.5 ppm or less. Pressurization from normal pressure to 0.05 MPa was performed with N2, followed by depressurization to return to normal pressure. This operation was repeated ten times to replace with N2. Thereafter, the mixture was uniformly dissolved under stirring at 135° C. and 0.3 MPa. Thereafter, the dissolved solution was continuously supplied to the heating tube using a liquid supply pump, and the temperature was raised up to 260° C. in the heating tube. Heating was continued for 0.5 hour. Thereafter, the reaction mixture was fed to a pressurized reactor. The reaction mixture was heated at 270° C. while distilling off par...

Embodiment 2

[0117] The same operation as in Example 1 was carried out until vacuum drying, thereby obtaining a low-order condensate. Then, using a blender (capacity: 0.1m 3 ) The lower condensate was reacted for 10 hours at 210° C. and a vacuum of 0.07 kPa to obtain a semi-aromatic polyamide resin.

Embodiment 3

[0119] Except for changing the compounding amount of 1,6-hexamethylenediamine to 8.94 kg (76.9 mol) and changing the compounding amount of acetic acid as an end-capping agent to 159.4 g (2.7 mol), the same procedure as in Example 1 The same operation until vacuum drying to obtain low-grade condensates. Then, using a blender (capacity: 0.1m 3 ) react the lower condensate at 225° C. and a vacuum of 0.07 kPa for 6 hours to obtain a semi-aromatic polyamide resin.

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
melting pointaaaaaaaaaa
glass transition temperatureaaaaaaaaaa
melting pointaaaaaaaaaa
Login to View More

Abstract

The present invention provides a semi-aromatic polyamide resin that has exceptional heat resistance and thermal discoloration resistance, is also capable of suppressing mold contamination by out-gas during melt molding, and has exceptional molten fluidity, gelling characteristics, and mechanical properties, wherein: the semi-aromatic polyamide resin contains a structural unit obtained from hexamethylenediamine and terephthalic acid, and a structural unit obtained from 11-aminoundecanoic acid or undecanelactam; the relative viscosity (RV) is within the range of 2.65-3.50; and the relationship of the amino end-group concentration (AEG), carboxy end-group concentration (CEG), and end concentration (EC) of amino end-groups blocked by monocarboxylic acid satisfies a specific formula.

Description

technical field [0001] The present invention relates to a semi-aromatic polyamide resin which is excellent in heat resistance and heat discoloration resistance, can suppress mold contamination due to outgassing during melt molding, is excellent in melt fluidity and gelation characteristics, and is suitable for Resin composition for molded articles such as automobile parts, bicycle parts and electric / electronic parts. Background technique [0002] Among thermoplastic resins, polyamide resins have been used as clothing materials, fibers for industrial materials, engineering plastics, and the like due to their excellent characteristics and ease of melt molding. Especially among engineering plastics, polyamide resins have been used in many applications not only for automobile parts and parts for industrial machines but also for various industrial parts, cabinet parts, electric / electronic parts and the like. [0003] Generally, 6T nylon composed of hexamethylenediamine (6) and 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 Applications(China)
IPC IPC(8): C08G69/36
CPCC08G69/36C08G69/30C08G69/04
Inventor 畑中洋祐林翔玉津岛诚
Owner TOYO TOYOBO CO LTD