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Poly (p-phenylene benzobisoxazole) polymer and preparation method thereof

A technology of benzobisoxazoles and poly-p-phenylene, which is applied in the field of poly-p-phenylene benzobisoxazole polymers and its preparation, can solve the problems of low elongation at break and achieve high molecular weight, high Toughness, effect of reducing crystallinity

Pending Publication Date: 2022-08-05
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high strength, high resistance and low density of PBO fiber are very suitable for application in tires and conveyor belts, which can significantly reduce the weight of tires and conveyor belts and improve the heat resistance level. However, the current high-strength PBO fibers have elongation at break Less than 3.5%, not suitable for use in these fields
[0006] At present, all kinds of rubber skeleton fiber materials in my country are mostly concentrated on traditional materials, and high-performance fiber materials are rarely used, especially the super fiber PBO fiber with excellent performance. The application in my country's rubber field has just begun and is still in its infancy.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] In a 200L stainless steel reactor equipped with strong stirring, 92.8Kg of polyphosphoric acid (concentration of 84%) was firstly added, and high-purity nitrogen was introduced to replace the air, and then 20Kg of 4,6-diaminoisophthalene was added under nitrogen protection. Phenol hydrochloride, sealed reactor. Stir and evacuate slowly, heat the reaction material in the reactor to 60°C, hold for 12 hours, then slowly heat up to 100°C and continue the reaction for 36 hours, until the gas is neutral when detected by pH test paper at the vacuum outlet.

[0048] The vacuum of the reactor was removed, and 14.0Kg of terephthalic acid, 1.4Kg of adipic acid and 56.0Kg of phosphorus pentoxide were successively added under nitrogen protection, and the reactor was sealed. The reaction system was heated to 120°C for 12 hours, 140°C for 12 hours, then heated to 160°C for 12 hours, and finally continued at 180°C for 12 hours to complete the polymerization reaction. [η] of the polyme...

Embodiment 2

[0050] In a 200L stainless steel reactor equipped with strong stirring, 80.0Kg of polyphosphoric acid (concentration of 82%) was firstly added, and high-purity nitrogen was introduced to replace the air, and then 20Kg of 4,6-diaminoresorcinol was added under nitrogen protection. Hydrochloride, sealed reactor. Stir and evacuated slowly, heat the reaction material in the reactor to 60°C, hold for 8 hours, then slowly heat up to 95°C and continue the reaction for 36 hours, until the gas is neutral when detected by pH test paper at the vacuum outlet.

[0051] The vacuum of the reactor was removed, and 14.8Kg of terephthalic acid, 554g of succinic acid and 56.0Kg of phosphorus pentoxide were sequentially added under nitrogen protection, and the reactor was sealed. The reaction system was heated to 120°C for 8 hours, 140°C for 12 hours, then heated to 160°C for 12 hours, and finally continued at 180°C for 6 hours to complete the polymerization reaction. [η] of the polymer = 33 dL / g...

Embodiment 3

[0053] In a 200L stainless steel reactor equipped with strong stirring, 72.4Kg of polyphosphoric acid (concentration of 80%) was firstly added, and high-purity nitrogen was introduced to replace the air, and then 20Kg of 4,6-diaminoresorcinol was added under nitrogen protection. Hydrochloride, sealed reactor. Stir and slowly evacuated, the reaction material in the reactor was heated to 60°C, kept for 24 hours, and then slowly raised to 100°C to continue the reaction for 24 hours, until the gas was detected as neutral by pH test paper at the vacuum outlet.

[0054] The vacuum of the reactor was removed, and 15.1Kg of terephthalic acid, 485g of 1,4-cyclohexanedicarboxylic acid and 54.5Kg of phosphorus pentoxide were sequentially added under nitrogen protection, and the reactor was sealed. The reaction system was heated to 120°C for 6 hours, 140°C for 8 hours, then heated to 160°C for 12 hours, and finally continued at 180°C for 12 hours to complete the polymerization reaction. ...

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Abstract

The invention discloses a poly (p-phenylene benzobisoxazole) polymer and a preparation method thereof, and the polymer is a copolymer of 4, 6-diamino resorcinol and at least two types of dicarboxyl monomers; wherein the two types of dicarboxyl monomers are terephthalic acid and dicarboxyl monomers capable of forming flexible chain segments respectively. By introducing the flexible chain segment, the rigidity of the poly (p-phenylene benzobisoxazole) polymer chain segment is reduced, and the toughness of the material is improved; besides, by introducing the dicarboxyl comonomer of a flexible chain segment, the regularity of partial molecular arrangement is broken, and the crystallinity is reduced, so that the material has high toughness while having high strength; meanwhile, the polymer has high molecular weight and excellent thermal stability.

Description

technical field [0001] The invention relates to a polymer for preparing high-performance fibers and a preparation method thereof, belonging to the technical field of polymers and preparation thereof, and more particularly to a poly-p-phenylene benzobisoxazole used for preparing high-strength and high-toughness fibers Polymers and methods for their preparation. Background technique [0002] Polyparaphenylene benzobisoxazole (PBO) fiber is a new type of high-performance fiber with high strength, high modulus, high temperature resistance and flame retardancy, as well as good chemical and dimensional stability. 1st Century Super Fiber. [0003] PBO fiber has broad application prospects in high-end equipment, military, aerospace and civilian fields. As a composite reinforcement material, it can be used in rocket engine heat insulation, insulation, fuel tanks, high-performance bulletproof armor, structural stealth integrated materials and other fields. The lightweight, miniaturi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/22
CPCC08G73/22
Inventor 肖耀南李春成张京华
Owner INST OF CHEM CHINESE ACAD OF SCI
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