Wholly-aromatic high-temperature-resistant nylon as well as preparation method and application thereof

Abstract

The invention relates to the field of preparation of high polymer materials, in particular to wholly aromatic high-temperature-resistant nylon as well as a preparation method and application thereof. The copolymerized high-temperature-resistant nylon disclosed by the invention is formed by carrying out copolycondensation on meta-aromatic diacid and meta-aromatic diamine with relatively high reaction activity; on the other hand, a certain amount of high-temperature-resistant branching auxiliary agent is introduced into a polycondensation system, and the wholly aromatic high-temperature-resistant nylon with relatively high relative viscosity and better melt flowability and processability is prepared through prepolymerization and solid-phase tackifying, and has obvious advantages in preparation of high-filling composite materials or manufacturing of complex parts; the preparation method is simple and easy to implement, and the application field is wide.

Description

technical field

[0001] The invention relates to the field of polymer material preparation, in particular to a wholly aromatic high-temperature-resistant nylon and its preparation method and application. Background technique

[0002] Polyamide (PA), commonly known as nylon, is a general term for resins containing repeated amide groups in the molecular chain. High temperature resistant nylon refers to nylon engineering plastics that can be used above 150°C for a long time. It has good wear resistance, heat resistance, oil resistance, chemical resistance, dimensional stability and excellent mechanical properties. At present, the high-temperature resistant nylon that has been industrialized is mainly semi-aromatic, and the varieties include PA6T copolymer, PA9T, PA10T, PA12T, etc. At present, the machinery industry, the automobile industry and the electronic and electrical industry have higher requirements for the mechanical properties and heat resistance of nylon materials, es...

Examples

preparation example Construction

[0034] The first aspect of the present invention provides a preparation method of all aromatic high temperature resistant nylon, the preparation method comprising the following steps:

[0035] 1) Prepolymerize meta-aromatic diacid, meta-aromatic diamine, high temperature resistant branching aid, end-capping agent and antioxidant to prepare fully aromatic nylon prepolymer;

[0036] 2) The wholly aromatic nylon prepolymer prepared in step 1) is subjected to solid-phase thickening to prepare fully aromatic high-temperature-resistant nylon.

[0037] In the preparation method of the all-aromatic high-temperature-resistant nylon provided by the present invention, the step 1) is to combine meta-position aromatic diacid, meta-position aromatic diamine, high-temperature resistant branching auxiliary agent, end-capping agent and antioxidant Agents and prepolymerization to obtain fully aromatic nylon prepolymers. specific:

[0038] In the step 1), the meta-aromatic diacid and the meta-...

Embodiment 1

[0069] The mixed diacid (the molar ratio of isophthalic acid and 4,6-dimethylisophthalic acid is 8:1) and m-xylylenediamine are salted in water at a molar ratio of 0.97:1 to obtain a fully aromatic 5000g fully aromatic nylon salt, 10g benzoic acid, 10g sodium phosphite and 50g six (4-carboxyphenoxy) cyclotriphosphazene are dropped into the reactor, and the air in the reactor is replaced with high-purity nitrogen for 3 ~4 times, heat up to 230~250°C, react for 1~3h, then drain 10~30% of the solvent, continue to react for 1~3h, then cool down to normal temperature and discharge, centrifuge to remove the solvent to obtain a prepolymer. Then put the prepolymer into the drum reactor, and increase the viscosity in the solid phase for 4 hours to obtain a wholly aromatic high-temperature-resistant nylon with a relative viscosity of 2.18.

Embodiment 2

[0071] Salt the mixed diacid (the molar ratio of isophthalic acid and 4,6-dimethylisophthalic acid is 6:1) and m-xylylenediamine in water at a molar ratio of 0.97:1 to obtain a fully aromatic 5000g fully aromatic nylon salt, 10g benzoic acid, 10g sodium phosphite and 50g six (4-carboxyphenoxy) cyclotriphosphazene are dropped into the reactor, and the air in the reactor is replaced with high-purity nitrogen for 3 ~4 times, heat up to 230~250°C, react for 1~3h, then drain 10~30% of the solvent, continue to react for 1~3h, then cool down to normal temperature and discharge, centrifuge to remove the solvent to obtain a prepolymer. Add the prepolymer into the drum reactor and increase the viscosity in the solid phase for 4 hours to obtain a wholly aromatic high-temperature-resistant nylon with a relative viscosity of 2.14.

technical field

[0001] The invention relates to the field of polymer material preparation, in particular to a wholly aromatic high-temperature-resistant nylon and its preparation method and application. Background technique

[0002] Polyamide (PA), commonly known as nylon, is a general term for resins containing repeated amide groups in the molecular chain. High temperature resistant nylon refers to nylon engineering plastics that can be used above 150°C for a long time. It has good wear resistance, heat resistance, oil resistance, chemical resistance, dimensional stability and excellent mechanical properties. At present, the high-temperature resistant nylon that has been industrialized is mainly semi-aromatic, and the varieties include PA6T copolymer, PA9T, PA10T, PA12T, etc. At present, the machinery industry, the automobile industry and the electronic and electrical industry have higher requirements for the mechanical properties and heat resistance of nylon materials, es...

Examples

preparation example Construction

[0034] The first aspect of the present invention provides a preparation method of all aromatic high temperature resistant nylon, the preparation method comprising the following steps:

[0035] 1) Prepolymerize meta-aromatic diacid, meta-aromatic diamine, high temperature resistant branching aid, end-capping agent and antioxidant to prepare fully aromatic nylon prepolymer;

[0036] 2) The wholly aromatic nylon prepolymer prepared in step 1) is subjected to solid-phase thickening to prepare fully aromatic high-temperature-resistant nylon.

[0037] In the preparation method of the all-aromatic high-temperature-resistant nylon provided by the present invention, the step 1) is to combine meta-position aromatic diacid, meta-position aromatic diamine, high-temperature resistant branching auxiliary agent, end-capping agent and antioxidant Agents and prepolymerization to obtain fully aromatic nylon prepolymers. specific:

[0038] In the step 1), the meta-aromatic diacid and the meta-...

Embodiment 1

[0069] The mixed diacid (the molar ratio of isophthalic acid and 4,6-dimethylisophthalic acid is 8:1) and m-xylylenediamine are salted in water at a molar ratio of 0.97:1 to obtain a fully aromatic 5000g fully aromatic nylon salt, 10g benzoic acid, 10g sodium phosphite and 50g six (4-carboxyphenoxy) cyclotriphosphazene are dropped into the reactor, and the air in the reactor is replaced with high-purity nitrogen for 3 ~4 times, heat up to 230~250°C, react for 1~3h, then drain 10~30% of the solvent, continue to react for 1~3h, then cool down to normal temperature and discharge, centrifuge to remove the solvent to obtain a prepolymer. Then put the prepolymer into the drum reactor, and increase the viscosity in the solid phase for 4 hours to obtain a wholly aromatic high-temperature-resistant nylon with a relative viscosity of 2.18.

Embodiment 2

[0071] Salt the mixed diacid (the molar ratio of isophthalic acid and 4,6-dimethylisophthalic acid is 6:1) and m-xylylenediamine in water at a molar ratio of 0.97:1 to obtain a fully aromatic 5000g fully aromatic nylon salt, 10g benzoic acid, 10g sodium phosphite and 50g six (4-carboxyphenoxy) cyclotriphosphazene are dropped into the reactor, and the air in the reactor is replaced with high-purity nitrogen for 3 ~4 times, heat up to 230~250°C, react for 1~3h, then drain 10~30% of the solvent, continue to react for 1~3h, then cool down to normal temperature and discharge, centrifuge to remove the solvent to obtain a prepolymer. Add the prepolymer into the drum reactor and increase the viscosity in the solid phase for 4 hours to obtain a wholly aromatic high-temperature-resistant nylon with a relative viscosity of 2.14.

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