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Preparation method for ultraviolet resistant and damp-heat aging resistant PBO (polybenzoxazole) fiber

A UV-resistant, heat-and-humidity-resistant technology, applied in fiber processing, fiber types, textiles and papermaking, etc., can solve the problems of exacerbating the aging of PBO fibers by heat and humidity, and improve the aging resistance to ultraviolet light and heat and humidity. Preparation steps Simple, uniform effect

Inactive Publication Date: 2012-09-26
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to uniformly disperse the nanoparticles in the sol, the dispersant polyethylene glycol used in this patent is hydrophilic, which causes the surface of the fiber to become hydrophilic. While improving the light aging resistance of the PBO fiber, On the contrary, it will aggravate the humidity and heat aging of PBO fiber

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Weigh 5mL tetraethyl orthosilicate, 25mL ethanol (EtOH) and 4mL hydrochloric acid (HCl) respectively, heat and mix them evenly at 25°C, add 7.5mL trimethoxyphenylsilane, and continue to stir at 25°C for 5h , to obtain a uniform and stable organosilicon hydrophobic sol finishing solution.

[0035] (2) Heat up the organosilicon hydrophobic sol obtained in step (1) to 60°C, add 0.08g of ultraviolet light absorber UV-9, and mix the ultraviolet light absorber and organosilicon hydrophobic sol evenly with the assistance of ultrasonic oscillation, and shake The time is 1 hour, and then cooled to room temperature, and a curing catalyst aluminum acetylacetonate is added to obtain a uniform and stable organosilicon hydrophobic sol composite finishing solution.

[0036] (3) Immerse the PBO fiber into the organosilicon hydrophobic sol composite finishing solution obtained in step (2) for 0.5h, then take out the fiber, dry it naturally at room temperature for 12h, and then place...

Embodiment 2

[0039] This example differs from Example 1 in that perfluorotriethoxysilane is added instead of trimethoxyphenylsilane, and the others are the same as Comparative Example 1.

[0040] The PBO fiber that this example obtains passes through 1100w / m 2 After 110 hours of ultraviolet light irradiation, the strength retention rate was 84%. Under the conditions of no ultraviolet light irradiation, 80°C and 80% relative humidity under the conditions of damp heat aging, the fiber strength retention rate is 98% after 360 hours.

Embodiment 3

[0042] The difference between this example and Example 1 is that the added ultraviolet light absorber is UV-531, and the others are the same as Comparative Example 1.

[0043] The PBO fiber that this example obtains passes through 1100w / m 2 After 110 hours of ultraviolet light irradiation, the strength retention rate was 78%. Under the conditions of no ultraviolet light irradiation, 80°C and 80% relative humidity under the conditions of heat and humidity aging, the fiber strength retention rate is 96% after 360 hours.

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PUM

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Abstract

The invention relates to a preparation method for an ultraviolet resistant and damp-heat aging resistant PBO (polybenzoxazole) fiber. The preparation method comprises the specific steps as follows: (1) preparing organosilicon hydrophobic sol; (2) preparing an organosilicon hydrophobic sol composite finishing liquor; and (3) immersing a PBO fiber into the organosilicon hydrophobic sol composite finishing liquor obtained in the step 2 for 0.5 to 2 h, then taking out the fiber, naturally airing the fiber at room temperature for 12 to 48 h, and placing the fiber in a drying cabinet for curing for2 to 5 h at 80 to 100 DEG C, so as to obtain a PBO fiber with a uniform hydrophobic surface coating. The invention has the advantages that ethanol is adopted as dispersant to enable photostabilizer to be uniformly dispersed in an organosilicon coating precursor, so as to guarantee the dispersing uniformity and endow the PBO fiber with ultraviolet aging resistance; and in the curing process, the ethanol volatilizes, organosilicon is subjected to crosslinking curing on the surface of the fiber to form the hydrophobic organosilicon coating, so as to endow the fiber with damp-heat aging resistance.

Description

【Technical field】 [0001] The invention relates to the technical field of PBO fibers, in particular to a preparation method of PBO fibers which are resistant to ultraviolet light and moisture and heat aging. 【Background technique】 [0002] Polyphenylenebenzobisoxazole (referred to as PBO) is a rigid rod-shaped liquid crystal polymer with a full aromatic heterocycle. The PBO fiber produced by the dry-jet wet spinning process has many excellent properties such as high strength, high modulus, and high temperature resistance. Known as "the super fiber of the 21st century", it is one of the high-performance fibers with the best comprehensive properties at present, and has very broad application prospects in high-tech fields such as aerospace, national defense and military. [0003] Although PBO fiber has excellent performance, the aging and failure of its products during use has plagued the use of PBO fiber, especially the body armor made of PBO fiber has obvious aging phenomenon ...

Claims

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Application Information

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IPC IPC(8): D06M13/50D06M101/30
Inventor 刘小云汪益龙秦德君庄启昕李欣欣钱军韩哲文
Owner EAST CHINA UNIV OF SCI & TECH