Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

Synthesis process of nylon MXD6

A synthesis process, nylon technology, applied in the field of nylon MXD6 synthesis process, can solve the problems of high melting point and poor processing performance

Pending Publication Date: 2021-05-14
上海庚彩新材料科技有限公司
View PDF5 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Fully aromatic polyamide is a kind of polymer in which amide groups and benzene rings are connected to each other, and its processing performance is poor due to its high melting point

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
  • Synthesis process of nylon MXD6

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] A kind of synthetic technique of nylon MXD6, comprises the following steps:

[0050] (1) Add 5.18 kg (35.4 mol) of adipic acid and 10.40 kg of deionized water (as a solvent) into a 50L salt-forming kettle, start stirring, and add 5.16 kg (37.9 mol) after the adipic acid is dissolved m-xylylenediamine, after replacing nitrogen for 3 times, heat up to 80°C, adjust the pH value of the solution to 7.5 by adding m-xylylenediamine, and obtain m-xylylene adipamide salt solution after reacting for 1 hour, with a total weight of 20.12 kg;

[0051] (2) Add the m-xylylene adipamide salt solution that step (1) obtains to concentrate in the concentration kettle, and the concentration temperature is set at 120° C., and when the distilled liquid is 6.66 kilograms, the salt concentration in the kettle is already After reaching 70wt%, stop the reaction, add activated carbon to the distilled liquid and filter to obtain the filtrate, which is used as the solvent in the step (1);

[0052...

Embodiment 2

[0056] A kind of synthetic technique of nylon MXD6, comprises the following steps:

[0057] (1) Add 5.18 kg (35.4 mol) of adipic acid and 10.40 kg of deionized water (as a solvent) into a 50L salt-forming kettle, start stirring, and add 4.97 kg (36.5 mol) after the adipic acid is dissolved m-xylylenediamine, after replacing nitrogen for 3 times, the temperature was raised to 80°C, and the pH value of the solution was adjusted to 7.2 by adding m-xylylenediamine, and after 2 hours of reaction, adipamide m-xylylenediamine salt solution was obtained, with a total weight of 20.55 kg;

[0058] (2) the adipyl m-xylylenediamine salt solution that step (1) obtains is added to concentrate in the concentrated still, and the concentrated temperature is set as 135 ℃, stops reaction when the salt concentration reaches 80wt% in the still, to distillation Add active carbon to the liquid and filter to obtain the filtrate, which can be reused in step (1);

[0059] (3) 5 grams of m-xylylenedia...

Embodiment 3

[0063] A kind of synthetic technique of nylon MXD6, comprises the following steps:

[0064] (1) Add 5.18 kg (35.4 mol) of adipic acid and 10.40 kg of deionized water (as a solvent) into a 50L salt-forming kettle, start stirring, and add 5.16 kg (37.9 mol) after the adipic acid is dissolved m-xylylenediamine, after replacing nitrogen for 3 times, heat up to 90°C, adjust the pH value of the solution to 7.8 by adding m-xylylenediamine, and obtain adipamide m-xylylenediamine salt solution after 1 hour of reaction, the total weight 20.12 kg;

[0065] (2) the adipyl m-xylylenediamine salt solution that step (1) obtains is added to concentrate in the concentrated still, and the concentrated temperature is set as 140 ℃, stops reaction when the salt concentration reaches 90wt% in the still, to distillation Filtrate is obtained by filtering after adding activated carbon to the liquid, which can be used as a solvent in step (1);

[0066] (3) Add the above-mentioned concentrated m-xylyl...

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 relates to a synthesis process of nylon MXD6, and the process comprises the following steps: (1) adding m-xylylenediamine, adipic acid and a solvent into a salt forming kettle for salt forming reaction, adjusting the pH value to alkalescence, and obtaining an adipic acid m-xylylenediamine salt solution after complete reaction; (2) concentrating the adipyl m-xylylenediamine salt solution obtained in the step (1) in a concentration kettle to obtain an adipyl m-xylylenediamine salt concentrated solution; (3) mixing the adipyl m-xylylenediamine salt concentrated solution obtained in the step (2) with an auxiliary agent in a polymerization kettle, carrying out a pre-polymerization reaction, and carrying out post-treatment to obtain a prepolymer; and (4) carrying out solid-phase tackifying reaction on the prepolymer obtained in the step (3) to obtain the nylon MXD6. Compared with the prior art, the method has the advantages of small production scale, simple steps, low cost, flexible and diversified product marks, high product viscosity, high melting point and good mechanical properties.

Description

technical field [0001] The invention belongs to the field of chemical synthesis, and in particular relates to a synthesis process of nylon MXD6. Background technique [0002] Polyamide is widely used in various fields such as clothing fibers, engineering plastics, films, electronic and electrical components, among which PA6 and PA66 are easy to process, low cost, easy to obtain raw materials, good toughness, high tensile strength, chemical resistance, and With advantages such as abrasive resistance and wrinkle resistance, they have become the two polyamides with the highest production capacity in industrial production. At the same time, nylon 6 and nylon 66 also have disadvantages such as poor heat resistance, poor dimensional stability, and poor barrier properties, so their use in many application fields is still limited. [0003] Due to the introduction of benzene rings in the main chain, aromatic polyamides have improved heat resistance and rigidity, and have the advanta...

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): C08G69/26C08G69/28
CPCC08G69/26C08G69/28
Inventor 李修函杨韶辉王贤丰孙宇露张明晖
Owner 上海庚彩新材料科技有限公司
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
Eureka Blog
Learn More
PatSnap group products