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Method for improving ultraviolet resistance of POB fibers by using bifunctional hyperbranched siloxane

A siloxane and bifunctional technology, which is applied in the field of improving the UV resistance and adhesion of PBO fibers, can solve the problems of poor adhesion of the resin matrix interface, easy to be damaged by light, and low UV resistance of PBO fibers, and achieves low price. , Enhanced UV resistance and improved adhesion

Active Publication Date: 2016-10-12
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems of low UV resistance of existing PBO fibers, easy to be damaged by light, and poor interface adhesion with resin matrix, the present invention provides a method for improving the UV resistance of PBO fibers with bifunctional hyperbranched siloxane

Method used

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  • Method for improving ultraviolet resistance of POB fibers by using bifunctional hyperbranched siloxane
  • Method for improving ultraviolet resistance of POB fibers by using bifunctional hyperbranched siloxane

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specific Embodiment approach 1

[0026] Specific embodiment one: the method that hyperbranched siloxane provided in this embodiment improves the anti-ultraviolet performance of PBO fiber is carried out through the following steps:

[0027] 1. PBO fiber pretreatment:

[0028] (1) Use a Soxhlet extractor to extract the PBO fiber first to remove surface impurities. The specific steps are: wrap a certain quality of PBO fiber wrapped on a glass slide with filter paper, and add it to the Soxhlet extractor, add Acetone carries out extraction 48h;

[0029] (2) After the extraction is completed, wash and dry, then add to the solution of epichlorohydrin and acetone (the volume ratio of epichlorohydrin and acetone is 1:5), and then carry out the intensity of 40kGy -ray radiation treatment for 30 minutes to obtain pretreated PBO fibers, that is, epichlorohydrin grafted PBO fibers.

[0030] Two, the preparation of difunctional hyperbranched siloxane:

[0031] (1) Add KH560, KH570 and water into a three-necked flask, a...

specific Embodiment approach 2

[0042] Embodiment 2: This embodiment differs from Embodiment 1 in that the mass ratio of KH560, KH570 and water in step 2 is (KH560+KH570):H2O=1:1.3. Others are the same as the first embodiment.

[0043] The PBO fiber coated with hyperbranched siloxane obtained in this embodiment and the PBO fiber in step 1 were irradiated with 1000W ultraviolet light for 20s, and then the fiber monofilament pull-out test was performed. The comparison of the two shows that the tensile strength of the PBO fiber precursor in step one is 4.91GPa, and the tensile strength of the PBO fiber in the step one irradiated by ultraviolet light is 4.27GPa; The tensile strength of PBO fiber is 4.73GPa after ultraviolet light irradiation, and the anti-ultraviolet performance has been greatly improved.

specific Embodiment approach 3

[0044] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is: in step 2, heat to 70° C. for 4.5 hours. Other steps and parameters are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a method for improving the ultraviolet resistance of POB fibers by using bifunctional hyperbranched siloxane. The method comprises the following steps: (1) putting Epoxy chloropropane grafted PBO (poly(p-phenylenebenzobisoxazole)) fibers in a 3-mouth bottle; (2) adding distilled water and a methanol solvent to the 3-mouth bottle to immerse the fibers, and adding a certain amount of NaOH to adjust the pH to 8-10; (3) putting bifunctional hyperbranched siloxane in the 3-mouth bottle at 30-40DEG C; (4) heating the bottle to 60-80DEG C from 30-40DEG C, and continuously stirring above materials for 4-5 h to obtain bifunctional hyperbranched siloxane grafted PBO fibers; and (5) taking out the fibers, cleaning the fibers with a large amount of deionized water and anhydrous ethanol, and carrying out vacuum drying. Grafting combination of the hyperbranched siloxane to the PBO fibers obviously enhances the ultraviolet resistance of the PBO fibers; and a hyperbranched siloxane system has a large amount of active groups, so the PBO can get a good coating layer, and the cohesiveness between the surface and resin is improved.

Description

technical field [0001] The present invention relates to a method for improving the ultraviolet resistance and adhesion of PBO fibers. Background technique [0002] PBO fiber is an aromatic heterocyclic polymer (poly-p-phenylene benzodiimidazole) fiber, which has excellent mechanical properties, thermal properties and good environmental resistance. PBO fiber is considered to be the most promising in the preparation of composite materials. Reinforcement body. The PBO fiber polymer is affected by the spinning process, and the molecular chains are highly oriented and parallel along the fiber axial direction. Therefore, the PBO fiber has a very high degree of crystallinity and axial orientation, which makes the PBO fiber have excellent performance. However, the fatal disadvantage of PBO fiber is its poor UV resistance, and the lack of polar functional groups on the surface leads to poor adhesion, which greatly limits the application of PBO fiber. Contents of the invention [...

Claims

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Application Information

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IPC IPC(8): D06M10/08D06M13/513D06M101/30
CPCD06M10/08D06M13/513D06M2101/30D06M2200/25
Inventor 姜波张奎元黄玉东赵立伟潘海涛祝长城
Owner HARBIN INST OF TECH
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