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Poly(p-phenylene benzobisoxazole) composite fiber containing nano-TiO2 preparation method

A nano-titanium dioxide, phenylene benzene technology, applied in the direction of fiber processing, fiber chemical characteristics, single-component synthetic polymer rayon, etc., to achieve the effect of excellent anti-ultraviolet aging performance

Inactive Publication Date: 2009-12-30
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a kind of preparation method of the PBO fiber of light aging resistance, to overcome the defective of existing PBO fiber

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1 part by mass of nano-titanium dioxide (TiO 2 ) dispersed in 200 parts by mass, concentration of 85% phosphoric acid (H 3 PO 4 ), add 170-310 parts by mass of phosphorus pentoxide (P 2 o 5 ), so that the mass fraction of phosphorus pentoxide in the solution is 80-85%, and then the nano-titanium dioxide dispersion is obtained by stirring.

[0029] The PBO prepolymer solution was prepared by the method described in the comparative example.

[0030] The PBO prepolymer solution and the nano-titanium dioxide dispersion are pumped into a twin-screw extruder with an aspect ratio of 32 and an inner diameter of 21.7 mm respectively with a hydraulic pump, and the speed of the metering pump is controlled to make the delivery volume of the PBO prepolymer solution 20g / min, nano-titanium dioxide dispersion (TiO 2 / PA) delivery rate is 140g / min; the shear force in the extruder is 500S -1 , the temperature is between 180~210 ℃, and the residence time is about 30 minutes. After t...

Embodiment 2

[0032] Adopt the method as described in embodiment 1 to carry out polymerization and spinning, difference is that nano-titanium dioxide solution enters the delivery rate of twin-screw extruder and is 90g / min; Obtaining nano-titanium dioxide content is the PBO composite fiber of 7wt.%. The average diameter is 32 μm, the tensile strength is 2.3 GPa, and after being exposed to ultraviolet light for 100 hours, the strength retention rate is 61%.

Embodiment 3

[0034] Adopt the method as described in embodiment 1 to carry out polymerization and spinning, difference is that nano-titanium dioxide solution enters the delivery rate of twin-screw extruder and is 50g / min; Obtaining the PBO composite fiber that nano-titanium dioxide content is 4wt.%, its The average diameter is 29 μm, and the tensile strength is 2.6 GPa. After irradiating with ultraviolet light for 100 hours, the strength retention rate is 71%.

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Abstract

The invention relates to a poly(p-phenylene benzobisoxazole) (PBO) composite fiber containing nano-TiO2 preparation method, comprising the following steps: dissolving 4,6-diaminoresorcinol hydrochloride and terephthalic acid and a certain number of phosphorus pentoxide in equal molar ratio in polyphosphoric acid, removing hydrogen chloride gas, heating and polymerizing to obtain poly(p-phenylene benzobisoxazole), then adding poly(p-phenylene benzobisoxazole) and phosphoric acid solution containing nano-TiO2 in a double-screw extruder and obtaining PBO composite fiber containing nano-TiO2 by dry-jet wet spinning; the invention uses nano-TiO2 particles with ultraviolet shielding property and utilizes the strong shearing and high effective blending of the double-screw extruder to prepare the composite fiber; compared with pure PBO fiber, the ultraviolet aging resistance property is effectively improved while the mechanical properties are not reduced.

Description

【Technical field】 [0001] The invention relates to the technical field of compound synthesis and preparation thereof, in particular to a preparation method of poly-p-phenylene benzobisoxazole composite fiber containing nano-titanium dioxide. 【Background technique】 [0002] Poly-p-phenylene benzobisthiazole (PBO) is a lyotropic liquid crystal polymer with excellent characteristics of high strength, high modulus, high temperature resistance and good environmental stability. Its performance is better than the famous Kevlar fiber, and it is regarded as a new generation of reinforcement fiber for advanced structural composite materials in the fields of aviation, aerospace, national defense, and planetary exploration. [0003] However, according to "Dow Chemical" and "Toyobo" reports, the mechanical strength of PBO fiber will be greatly reduced under the irradiation of ultraviolet-visible light. Peter J.Walsh and others found that PBO fiber is 750W / m 2 After 150 hours and 270 hou...

Claims

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Application Information

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IPC IPC(8): D01F6/94D01F1/10C08G73/22C08K3/22D01D5/06D01D1/00D01D1/06
Inventor 庄启昕谢众毛晓阳李欣欣钱军刘小云韩哲文
Owner EAST CHINA UNIV OF SCI & TECH
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