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A kind of high fluidity high temperature nylon and preparation method thereof

A high-fluidity, nylon-based technology, applied in the field of polymer materials, can solve the problems of reduced fluidity, limited application range, and increased melt viscosity, and achieve the effects of improved fluidity, simple process, and stable performance

Active Publication Date: 2016-09-28
JIANGMEN YOUJU NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the addition of benzene rings, the melt viscosity of semi-aromatic nylon and fully aromatic nylon increases, and the fluidity is greatly reduced, which is not conducive to injection molding and extrusion. For example, the melting point (370°C) of nylon 6T is higher than its decomposition temperature (350°C ), which severely limits the scope of application of this type of material, so it is very necessary to improve its flow properties without changing its other excellent properties
[0004] In order to improve the fluidity of high-temperature nylon, patents CN102344670A, CN102898822A, CN103642204A, CN101649109A and CN103627172A improve the fluidity of high-temperature nylon by means of high flow aids, liquid crystals and lubricants, while maintaining its high-temperature resistance properties, but the addition of these substances will inevitably Will affect its mechanical properties and other properties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 40wt% nylon 6T salt, 40wt% nylon 66 salt, 4wt% polyetheramine T403, 1wt% heat stabilizer, 1wt% hindered phenolic compound, 1wt% benzoic acid, 1wt% sodium hypophosphite, 12wt% % of deionized water was added to the high-pressure reaction kettle, and the nitrogen gas was used to ventilate 10 times, and then the nitrogen gas was filled to a pressure of 0.2MPa, and the reaction kettle was sealed, and the temperature was raised, and the temperature was controlled to raise the temperature to 230°C. After reaching 3.0MPa, keep the pressure for 3 hours, then slowly deflate, slowly reduce the pressure in the reactor to normal pressure within 3 hours, and keep the temperature at normal pressure for 2 hours, preheat the outlet, fill with nitrogen, open the outlet The material is discharged from the feed port, the prepolymer is crushed after being cooled by water, and then dried in a vacuum oven at 100°C for 12 hours. After cooling, the material can be discharged to obtain high-flui...

Embodiment 2

[0037] 37wt% nylon 6T salt, 31wt% nylon 610 salt, 6wt% polyethyleneimine, 1wt% heat stabilizer, 1wt% hindered phenolic compound, 1wt% benzoic acid, 1wt% sodium hypophosphite, 22wt% Add 100% deionized water into the autoclave, ventilate with nitrogen 10 times, seal the autoclave, heat up, control the heating rate so that the temperature rises to 240°C, and keep the pressure for 3 hours after the pressure of the autoclave rises to 3.5MPa , then slowly deflate, within 3 hours the pressure in the reactor is slowly reduced to normal pressure, and kept at normal pressure for 2 hours, preheating the discharge port, filling with nitrogen, opening the discharge port to discharge, the prepolymer is passed through After cooling with water, pulverize, then dry in a vacuum oven at 100°C for 12 hours, put the prepolymer in a solid phase reactor, react in vacuum at 220°C for 8 hours, and discharge the material after cooling to obtain a high-quality product. Flowing high temperature nylon.

Embodiment 3

[0039]75wt% nylon 9T salt, 15wt% nylon 1010 salt, 4wt% polyetheramine T403, 1wt% heat stabilizer, 1wt% hindered phenolic compound, 1wt% benzoic acid, 1wt% sodium hypophosphite, 2wt% Add 100% deionized water into the high-pressure reactor, ventilate with nitrogen 10 times, seal the reactor, heat up, control the heating rate to raise the temperature to 250°C, and keep the pressure for 3 hours after the pressure of the reactor rises to 3.6MPa , then slowly deflate, within 3 hours the pressure in the reactor is slowly reduced to normal pressure, and kept at normal pressure for 2 hours, preheating the discharge port, filling with nitrogen, opening the discharge port to discharge, the prepolymer is passed through After cooling with water, pulverize, then dry in a vacuum oven at 100°C for 12 hours, put the prepolymer in a solid phase reactor, react under vacuum and 240°C for 6 hours, and discharge the material after cooling to obtain a high-quality product. Flowing high temperature n...

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Abstract

The invention discloses high-fluidity high-temperature nylon. The high-fluidity high-temperature nylon is prepared by copolymerizing 30-85wt% of high-temperature nylon salt, 10-50wt% of aliphatic nylon salt, 1-15wt% of polyamine, 0.4-20wt% of aids and 1-25wt% of water, wherein the aids comprise 0.1-5wt% of a heat stabilizer, 0.1-5wt% of an antioxidant, 0.1-5wt% of a blocking agent and 0.1-5wt% of a catalyst. The invention also discloses a preparation method of the high-fluidity high-temperature nylon. The preparation method comprises the steps of synthesizing a prepolymer and synthesizing a terpolymer. The preparation method is simple in process and excellent in effects, the obtained high-temperature nylon is high in fluidity and the excellent performance is still maintained and is more stable than that of the modified nylon obtained by physical modification.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a high-fluidity high-temperature nylon and a preparation method thereof. Background technique [0002] Polyamide is currently the most widely used engineering plastic at home and abroad. It has excellent properties such as toughness, wear resistance, impact resistance, fatigue resistance, corrosion resistance, and oil resistance. Semi-aromatic nylon is an indispensable one in the nylon family. . Compared with aliphatic nylon, the most prominent performance potential of semi-aromatic nylon is heat resistance. Compared with fully aromatic nylon, semi-aromatic nylon has a broader application prospect due to its easy processing and molding. [0003] Semi-aromatic polyamide has improved heat resistance and mechanical properties, reduced water absorption, and has a more suitable cost performance due to the introduction of aromatic rings into the main chain of the polyamide...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G69/40C08G69/26C08G69/28
Inventor 王贤文江友飞黎昱
Owner JIANGMEN YOUJU NEW MATERIALS