A kind of PBO fiber sizing agent containing benzoxazole diamine compatibilizer and its application

A technology of benzoxazole diamine and sizing agent, which can be used in fiber treatment, fiber type, textile and paper making, etc., can solve problems such as poor compatibility and poor dispersion of nanoparticles, and achieve improved compatibility and surface activity. , the effect of simple operation

Active Publication Date: 2021-11-16
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a sizing agent that can be evenly dispersed on the surface of PBO fibers, has good compatibility with it, and can efficiently improve the interfacial bonding strength of PBO fibers / epoxy resin composite materials, and solves the problem of existing nanoparticles in the PBO fiber surface. The problem of poor surface dispersion and poor compatibility with PBO fibers

Method used

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  • A kind of PBO fiber sizing agent containing benzoxazole diamine compatibilizer and its application
  • A kind of PBO fiber sizing agent containing benzoxazole diamine compatibilizer and its application
  • A kind of PBO fiber sizing agent containing benzoxazole diamine compatibilizer and its application

Examples

Experimental program
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Effect test

Embodiment 1

[0068] (1) Silane coupling agent modified SiO 2

[0069] Dry SiO with a particle size of 10 nm 2 Nanoparticles were mixed with anhydrous toluene at a mass ratio of 1:20, and stirred continuously at 120°C for 0.5h to obtain a dispersed solution, and then γ-glycidyl etheroxypropyltrimethoxysilane was added, in which SiO 2 The mass ratio of nanoparticles to γ-glycidyl etheroxypropyltrimethoxysilane was 1:3, and the mixture was continuously stirred at 100°C for 12h to complete the grafting reaction. After centrifugation, the product was washed three times with ethanol, and dried in vacuum at 80 °C for 24 h to obtain the modified SiO 2 Nanoparticles.

[0070] (2) Synthesis of benzoxazole diamine compatibilizer

[0071] Add 4,6-diaminoresorcinol dihydrochloride, p-aminobenzoic acid and stannous chloride to polyphosphoric acid, in which 4,6-diaminoresorcinol dihydrochloride, p-aminobenzene The mol ratio of formic acid and stannous chloride is 1:2:0.1, and the phosphorus pentoxid...

Embodiment 2

[0079] (1) Silane coupling agent modified SiO 2

[0080] Dry SiO with a particle size of 200 nm 2 Nanoparticles and xylene were mixed at a mass ratio of 1:50, and stirred continuously at 120°C for 2 h to obtain a dispersed solution, and then 3-aminopropyltriethoxysilane was added, in which SiO 2 The mass ratio of nanoparticles to 3-aminopropyltriethoxysilane was 1:0.5, and the mixture was continuously stirred at 120° C. for 1 h to complete the grafting reaction. After centrifugation, the product was washed three times with ethanol, and dried in vacuum at 80 °C for 24 h to obtain the modified SiO 2 Nanoparticles.

[0081] (2) Synthesis of benzoxazole diamine compatibilizer

[0082] Add 3,3'-dihydroxybenzidine, 4-aminosalicylic acid and stannous chloride to polyphosphoric acid, wherein 3,3'-dihydroxybenzidine, 4-aminosalicylic acid and stannous chloride The molar ratio is 1:2.5:0.3, and the content of phosphorus pentoxide in polyphosphoric acid is 85wt%; N 2 Slowly raise t...

Embodiment 3

[0089] (1) Silane coupling agent modified SiO 2

[0090] Dry SiO with a particle size of 100 nm 2 Nanoparticles were mixed with N,N-dimethylacetamide at a mass ratio of 1:1, and stirred at 120°C for 1 hour to obtain a dispersed solution, and then 3-aminopropyltrimethoxysilane and γ-glycidyl ether oxygen were added. Mixture of propyltrimethoxysilane, where SiO 2The mass ratio of the nanoparticles to the mixture of 3-aminopropyltrimethoxysilane and γ-glycidyloxypropyltrimethoxysilane was 1:1.5, and the mixture was continuously stirred at 110° C. for 24 hours to complete the grafting reaction. After centrifugation, the product was washed three times with ethanol, and dried in vacuum at 80 °C for 24 h to obtain the modified SiO 2 Nanoparticles.

[0091] (2) Synthesis of benzoxazole diamine compatibilizer

[0092] Add 2,2-bis(3-amino-4-hydroxyphenyl)hexafluoropropane, 4-aminosalicylic acid and stannous chloride to polyphosphoric acid, in which 2,2-bis(3-amino-4 -Hydroxyphenyl...

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Abstract

The invention discloses a PBO fiber sizing agent containing a benzoxazole diamine compatibilizer and an application thereof. The sizing agent is modified by silane coupling agent SiO 2 , benzoxazole diamine, epoxy resin and organic solvent; the mass percent composition of sizing agent is as follows: silane coupling agent modified SiO 2 0.1-5%; benzoxazole diamine 0.1-1%; epoxy resin 0.5-3%; the balance organic solvent. Compared with the unmodified PBO fiber, the IFSS of the PBO fiber / epoxy resin composite material modified by using the sizing agent prepared by the invention can be increased by 55-95%. In addition, the surface treatment method used in the present invention is a dip-coating method, which is simple to operate, has mild conditions, does not cause a decrease in the mechanical and thermal properties of the PBO fiber, and has good repeatability and is easy for industrial production.

Description

technical field [0001] The invention relates to a PBO fiber sizing agent containing a benzoxazole diamine compatibilizer and an application thereof, belonging to the field of surface and interface modification of materials. Background technique [0002] Polyphenylenebenzobisoxazole (PBO) fiber is known as the "king of organic fibers" because of its ultra-high strength and modulus, excellent heat resistance and flame retardancy, which make it the most One of the most promising resin-based composite reinforcements. However, the surface of PBO fibers is very smooth and shows great chemical inertness. These deficiencies lead to extremely weak interfacial bonding with the matrix resin, which seriously limits the wide application of its composite materials. Therefore, the research on the surface modification of PBO fibers has important scientific significance and practical application value. [0003] So far, many methods have been developed to endow PBO fibers with surface activ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06M11/79D06M13/352D06M15/55C08L63/00C08L79/04D06M101/30
CPCC08L63/00C08L2205/16D06M11/79D06M13/352D06M15/55D06M2101/30C08L79/04
Inventor 吴绍华李春成肖耀南张博
Owner INST OF CHEM CHINESE ACAD OF SCI
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