A kind of preparation method of polyimide modified nylon resin

A polyimide and modified nylon technology, which is applied in the field of thermoplastic polyimide modified nylon resin, can solve the problems of limiting the research scope of modification and narrow selection of substrates, so as to improve water absorption and toughness, The effect of high viscosity

Active Publication Date: 2019-02-01
ZHUZHOU TIMES NEW MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Chinese published patent CN101230196A discloses a preparation method of in-situ polymerization modified nylon composite material, the matrix is ​​PA6, and does not involve other varieties of nylon materials, and the choice of matrix is ​​narrow; at the same time, it uses anionic polymerization, which is not suitable for other nylons modification, which limits the scope of its modification research, and this modification method prepares PA6-PI-PA6 tri-block copolymers, which limits the improvement of the performance of the material

Method used

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  • A kind of preparation method of polyimide modified nylon resin
  • A kind of preparation method of polyimide modified nylon resin
  • A kind of preparation method of polyimide modified nylon resin

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Embodiment 1

[0038] A kind of preparation method of polyimide modified nylon 6 of the present invention, comprises the following steps:

[0039] (1) Under the protection of nitrogen, dissolve 4,4'-diaminodiphenyl ether in N,N-dimethylformamide solvent, and then add 4,4'- Oxydiphthalic anhydride and stirring to react to obtain N,N-dimethylformamide solution of polyamic acid, in which 4,4'-diaminodiphenyl ether and 4,4'-oxydiphthalic acid The molar ratio of formic anhydride is 1.5:1, the mass fraction of the total amount of 4,4'-diaminodiphenyl ether and 4,4'-oxydiphthalic anhydride in the system (total mass of diamine, dianhydride and solvent) 15%;

[0040](2) Add m-xylene / pyridine mixed solvent in the N,N-dimethylformamide solution of polyamic acid prepared in step (1) (xylene and pyridine volume ratio are 2:1 in this mixed solvent), Then reflux at 60±5°C for 18 hours to obtain N,N-dimethylformamide solvent of thermoplastic polyimide. After cooling, precipitate with absolute ethanol, fil...

Embodiment 2

[0048] A kind of preparation method of polyimide modified nylon 66 of the present invention, comprises the following steps:.

[0049] (1) is identical with embodiment 1 step (1);

[0050] (2) is identical with embodiment 1 step (2);

[0051] (3) is identical with embodiment 1 step (3);

[0052] (4) Add 0.03mol compound salt I, 15mol adipic acid, 15mol hexamethylenediamine, 20wt% water (the amount of water added accounts for 20wt% of the total mass of compound salt I, adipic acid, hexamethylenediamine and water) In the 10L high-temperature and high-pressure polymerization kettle, nitrogen was replaced three times; then the stirring was started, the temperature inside the kettle was heated to 215°C, the pressure inside the kettle rose to 1.8MPa, and the pressure was maintained for 2 hours; The temperature in the kettle was gradually increased to 280°C; finally, the reaction was continued for 1 hour under the conditions of -0.006MPa and 280°C in the kettle; then the bottom valv...

Embodiment 3

[0056] A kind of preparation method of polyimide modified nylon 610 of the present invention, comprises the following steps:.

[0057] (1) is identical with embodiment 1 step (1);

[0058] (2) is identical with embodiment 1 step (2);

[0059] (3) is identical with embodiment 1 step (3);

[0060] (4) Add 0.03mol compound salt I, 15mol sebacic acid, 15mol hexamethylenediamine, 20wt% water (the amount of water added accounts for 20wt% of the total mass of compound salt I, sebacic acid, hexamethylenediamine and water) In the 10L high-temperature and high-pressure polymerization kettle, nitrogen was replaced three times; then the stirring was started, the temperature inside the kettle was heated to 215°C, the pressure inside the kettle rose to 1.8MPa, and the pressure was maintained for 2 hours; The temperature in the kettle was gradually increased to 270°C; finally, the reaction was continued for 1 hour under the conditions of -0.006MPa and 280°C in the kettle; then the bottom v...

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Abstract

The invention discloses a preparation method of polyimide modified nylon, wherein the preparation method comprises the following steps: carrying out a reaction of an amino-terminated thermoplastic polyimide prepolymer and dibasic acid to obtain a compound salt, then mixing the compound salt with a nylon polymeric monomer evenly, then carrying out polymerization, and thus obtaining the polyimide modified nylon. With use of the method for the polyimide modified nylon resin, a structure formula of the prepared modified nylon formula is randomly copolymerized, and the polyimide prepolymer is randomly distributed in nylon molecule chains, so as to be more beneficial to improve properties of the material; at the same time, with the addition of the polyimide prepolymer, the water absorption rate and toughness of the nylon material are improved; the amino-terminated prepolymer and the dibasic acid with equal molar ratio are used for preparing the compound salt, and high viscosity of the prepared polyimide modified nylon resin can be guaranteed to be prepared.

Description

technical field [0001] The invention belongs to the field of polymer materials, in particular to a method for modifying nylon resin with thermoplastic polyimide. Background technique [0002] Polyamide (nylon) is a material with the largest consumption, the most varieties and the widest application among the five major engineering plastics (polyamide, polyoxymethylene, polycarbonate, polyphenylene ether, polyester). Fatigue, corrosion resistance, oil resistance, self-lubrication, low friction coefficient, easy processing and other excellent properties. There are many varieties of polyamides, mainly including PA66, PA6, PA610, PA612, PA1010, PA11, PA12, PA1212, etc. Among them, PA6 and PA66 account for about 90% of the total PA and occupy a dominant position. However, due to the high water absorption of nylon, the product has poor dimensional stability and low impact strength in dry state or low temperature, which limits its wider application. For this reason, many researche...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G73/14
CPCC08G73/14
Inventor 曹凯凯郝彩霞陈林飞伍威高敬民陈智军彭军易勇
Owner ZHUZHOU TIMES NEW MATERIALS TECH
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