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Process for preparing poly-p-phenylenebenzobisthiazole (PBO) fiber/benzoxazine composite material

A technology of benzoxazine and composite materials, which is applied in fiber treatment, biochemical fiber treatment, textiles and papermaking, etc., to achieve the effect of low dielectric constant and dielectric loss factor, and high interlayer shear strength

Inactive Publication Date: 2014-08-20
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, benzoxazine resin, like other thermosetting resins, also has the defect of brittleness, so it needs to be toughened and modified

Method used

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  • Process for preparing poly-p-phenylenebenzobisthiazole (PBO) fiber/benzoxazine composite material
  • Process for preparing poly-p-phenylenebenzobisthiazole (PBO) fiber/benzoxazine composite material
  • Process for preparing poly-p-phenylenebenzobisthiazole (PBO) fiber/benzoxazine composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The PBO fibers were first immersed in an organic solution containing 0.2% horseradish peroxidase. Under the action of ultrasonic waves of 50-70W, a total of 10 mL of 4wt.% hydrogen peroxide solution was dropped into the system every 5min. After the dropwise addition, the reaction was performed for 0.5-2h. The fibers were taken out, washed with distilled water, and dried. Then, the coupling agent KH-560 was dissolved in acetone, the concentration was controlled at 3.0%, the pH value was adjusted to 3-6, the pretreated PBO fibers were soaked at room temperature for 1-48 hours, washed with distilled water, dried, and used for later use. The bismaleimide prepolymer with a mass fraction of 10% is mixed with the benzoxazine resin monomer, prepolymerized for 1 hour at 120-160 ° C, and then added with a volume fraction of 1 to 5 times. Acetone solution, mixed evenly to make a glue solution for later use. The treated PBO fibers are dipped, wound, and air-dried. The dipping temp...

Embodiment 2

[0033] First, the PBO fibers were immersed in an organic solution containing 0.2% horseradish peroxidase. Under the action of ultrasonic waves of 50-70W, a total of 15mL of 4wt.% hydrogen peroxide solution was dropped into the system every 5min. After the dropwise addition, the reaction was carried out for 0.5-2h, and the fibers were taken out, washed with distilled water, and dried. Then, the coupling agent KH-560 was dissolved in acetone, the concentration was controlled at 3.0%, the pH value was adjusted to 3-6, the pretreated PBO fibers were soaked at room temperature for 24 hours, washed with distilled water, dried, and used for later use. The bismaleimide prepolymer with a mass fraction of 20% is mixed with the benzoxazine resin monomer, prepolymerized at 120-160 ° C for 3 hours, and then added with a volume fraction of 1 to 5 times. Acetone solution, mixed evenly to make a glue solution for later use. The rest of the implementation steps are the same as in Example 1. ...

Embodiment 3

[0035]First, the PBO fibers were immersed in an organic solution containing 0.3% horseradish peroxidase. Under the action of ultrasonic waves of 50-70W, add 20mL of 4wt.% hydrogen peroxide aqueous solution into the system every 5min. After the addition is complete, react for 0.5-2h, take out the fiber, wash it with distilled water, and dry it. Then, dissolve the coupling agent KH-560 in acetone, control the concentration at 3.0%, adjust the pH value to 3-6, soak the pretreated PBO fiber at room temperature for 24 hours, wash with distilled water, dry, and set aside. Mix the bismaleimide prepolymer with a mass fraction of 15% and the benzoxazine resin monomer, prepolymerize at 120-160°C for 2 hours, and then add 1 to 5 times the volume fraction of Acetone solution, mixed evenly to make glue, set aside. The rest of the implementation steps are the same as those in Example 1.

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Abstract

The invention relates to a process for preparing a PBO fiber / benzoxazine composite material. The process is characterized by comprising the steps of firstly, immersing PBO fibers into an organic solution of horseradish peroxidase, dropping in an aqueous solution of 4 wt.% hydrogen peroxide, immersing in acetone containing KH-560, mixing bismaleimide prepolymers with benzoxazine resin monomers, conducting prepolymerization at the temperature in a range of 120-160 DEG C for 1-6 hours, then adding an acetone solution which is in a volume fraction of 1-5 times into the mixture to produce a glue solution, and conducting gum dipping on processed PBO fibers to obtain a prepreg. Finally, the prepreg is subjected to high-temperature compression moulding. The composite material which is prepared by the process has the advantages of being high in strength, high in modulus, resistant to high temperatures, high in interlaminar shear strength, low in dielectric constant and dielectric loss factor and capable of meeting the strict requirements of modern aviation fields for the composite material.

Description

technical field [0001] The invention belongs to the field of composite material science and technology, and in particular relates to a preparation method of a PBO fiber / benzoxazine composite material. Background technique [0002] With the development of science and technology in the aviation and aerospace fields, the performance requirements for composite materials are getting higher and higher. In addition to requiring low density, high modulus, excellent heat resistance and high specific strength, it also requires excellent dielectric properties Electrical properties and small thermal expansion coefficient and good molding process and other characteristics. However, the glass fiber / epoxy resin materials used today have problems such as high moisture absorption rate and weak resistance to space environment, which can no longer meet the requirements of high-speed flight of future aircraft. [0003] PBO fiber is a high-performance aromatic heterocyclic fiber made from PBO t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/06C08L79/04C08L79/08D06M16/00D06M11/50D06M13/513
Inventor 颜红侠刘超唐玉生梁国正
Owner NORTHWESTERN POLYTECHNICAL UNIV
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