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Ultrahigh molecular weight polyethylene fiber surface coating modification method

A technology of ultra-high molecular weight and polyethylene fiber, which is applied in the direction of ultrasonic/sonic fiber treatment, fiber treatment, fiber type, etc., can solve the problems of reduced polarization effect of polymer surface and reduced mechanical strength of fiber, and achieves improved impact strength, The effect of improving the flexural modulus and improving the bonding strength

Active Publication Date: 2022-08-05
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Corona discharge polarization is an important method of polymer surface treatment, but on the one hand, corona discharge polarization is time-sensitive. As time goes on, the polarization effect of polymer surface gradually decreases. In addition, high-energy discharge in the corona process, It will destroy the surface structure of the polymer to a certain extent, especially for fibers with small fineness. After corona treatment, the mechanical strength of the fibers will be greatly reduced.

Method used

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  • Ultrahigh molecular weight polyethylene fiber surface coating modification method
  • Ultrahigh molecular weight polyethylene fiber surface coating modification method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Add 0.1 mol of γ-methacryloyloxypropyltrimethoxysilane and 0.05 mol of ethyl orthosilicate to an aqueous ethanol solution (100 mL of ethanol and 200 mL of deionized water), add sodium hydroxide solution, and adjust the concentration of the solution. pH=8, stirring at room temperature for 4 h to obtain translucent organic nano-SiO 2 sol.

[0023] Dissolve 1.0 g of dopamine hydrochloride and 0.1 g of aniline in 0.5 L of deionized water, add sodium hydroxide solution, adjust the pH of the aqueous solution to 10, and stir for 3 hours to perform a pre-oxidative condensation reaction between dopamine hydrochloride and aniline , to obtain a mixed activation aqueous solution containing polydopamine-aniline copolymer.

[0024] The prepared organic SiO 2 The sol was slowly added to the prepared mixed activation aqueous solution, while adding, and stirred at a speed of 200 rpm, and then fully mixed for 2 hours after the addition was completed. The ultra-high molecular weight po...

Embodiment 2

[0027] 0.15mol of γ-methacryloyloxypropyltrimethoxysilane and 0.03mol of ethyl orthosilicate were added to ethanol aqueous solution (100mL ethanol and 100mL deionized water), sodium hydroxide solution was added, and the solution was adjusted. pH=9, stirring at room temperature for 6 h to obtain translucent organic nano-SiO 2 sol.

[0028] Dissolve 3.0 g of dopamine hydrochloride and 0.5 g of aniline in 0.5 L of deionized water, add sodium hydroxide solution, adjust the pH of the aqueous solution to 8, and stir for 2 hours to pre-oxidize and condense dopamine hydrochloride and aniline After the reaction, a mixed activation aqueous solution containing the polydopamine-aniline copolymer is obtained.

[0029] The prepared organic nano-SiO 2 Sol A was slowly added to the prepared mixed activation aqueous solution, while adding, and stirred at a speed of 500 rpm, and then fully mixed for 2 hours after the addition was completed. The ultra-high molecular weight polyethylene fiber ...

Embodiment 3

[0032] Add 0.05mol of γ-methacryloyloxypropyltrimethoxysilane and 0.05mol of ethyl orthosilicate to ethanol aqueous solution (250mL ethanol and 150mL deionized water), add sodium hydroxide solution, adjust the solution's concentration. pH=8, stirring at room temperature for 3 h to obtain translucent organic nano-SiO 2 sol.

[0033] Dissolve 2.0g of dopamine hydrochloride and 0.3g of aniline in 0.5L of deionized water, add tris(hydroxymethyl)aminomethane, adjust the pH of the aqueous solution to 8, and stir for 2h to make dopamine hydrochloride and aniline A pre-oxidative condensation reaction is carried out to obtain a mixed activation aqueous solution containing the polydopamine-aniline copolymer.

[0034] The prepared organic nano-SiO 2 The sol was slowly added to the prepared mixed activation aqueous solution, and the mixture was vigorously stirred while adding, and then fully mixed for 2 hours after the addition was completed. The ultra-high molecular weight polyethylen...

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Abstract

The invention discloses a surface coating modification method for ultra-high molecular weight polyethylene fibers, which not only improves the interface bonding strength of the ultra-high molecular weight polyethylene fibers and composite material matrix resin, but also greatly improves the impact, bending and other properties of the composite material. The method comprises the following steps: 1) preparing an organic nano SiO2 sol; 2) preparing a mixed activated aqueous solution containing a dopamine-aniline polymer; 3) slowly adding SiO2 sol into the mixed activated aqueous solution to obtain a mixed sol solution; 4) completely dipping the ultra-high molecular weight polyethylene fiber in the mixed sol solution for fiber surface precipitation to obtain the ultra-high molecular weight polyethylene fiber of which the surface is coated with a nano SiO2 / polydopamine-aniline copolymer hard outer layer; and 5) flatly laying the ultra-high molecular weight polyethylene fiber below an electrode plate of a corona device, and carrying out corona treatment through the corona device to obtain the surface-coated and modified ultra-high molecular weight polyethylene fiber.

Description

technical field [0001] The invention relates to a method for modifying the surface of fibers, and more particularly to a method for modifying the surface of ultra-high molecular weight polyethylene fibers. Background technique [0002] Since UHMWPE fiber was successfully developed and industrialized in the 1980s, it has been called the third generation of high-performance fiber after carbon fiber and aramid fiber because of its excellent properties. Because of its excellent mechanical properties, good low temperature resistance, high impact resistance, good corrosion resistance and acid and alkali resistance, it is used in aerospace, automotive parts, medical equipment and high-performance composite materials, etc. However, ultra-high molecular weight polyethylene fibers mainly exist in the form of C-C structural chains, the surface is inert and highly oriented crystalline, without active functional groups, and cannot produce strong interfacial interaction with the matrix ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M11/79D06M15/61D06M15/37D06M10/10D06M10/06D06M10/02D06M101/20
CPCD06M11/79D06M15/61D06M15/37D06M10/10D06M10/06D06M10/025D06M2101/20
Inventor 江国栋张宇曹少黄震宇吴小莲孔凡敏
Owner NANJING UNIV OF TECH
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