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Method for preparing polyolefin-based composite fibers by organically modifying nanoparticles

A nanoparticle and composite fiber technology, applied in the direction of single-component polyolefin rayon, fiber chemical characteristics, rayon manufacturing, etc., can solve the problems of improving the dispersion compatibility of nanoparticles, the effect is not ideal, and the process is complicated , to achieve the effect of overcoming steric hindrance effect, improving mechanical properties and simple operation

Active Publication Date: 2016-01-20
SHANGHAI RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods are either insufficient to greatly improve the dispersion of nanoparticles and their compatibility with polyolefins, or the process is complicated and difficult to control, making the final effect unsatisfactory.
[ShilunRuan, PingGao, T.X.Yu.Ultra-stronggel-spunUHMWPEfibersreinforcedusingmultiwalledcarbonnanotubes.Polymer, 2006(47): 604-1611] directly added multi-walled carbon nanotubes (MWNTs) after acidification to ultra-high molecular weight In polyethylene (UH-MWPE), UH-MWPE-based nanocomposite fibers were prepared, and it was found that adding 1 wt% of nanoparticles can effectively toughen UH-MWPE and improve its creep resistance, but this method shows that nanoparticles There has been a more obvious phenomenon of reunion

Method used

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  • Method for preparing polyolefin-based composite fibers by organically modifying nanoparticles
  • Method for preparing polyolefin-based composite fibers by organically modifying nanoparticles
  • Method for preparing polyolefin-based composite fibers by organically modifying nanoparticles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 4-(Chloromethyl)phenyltrimethoxysilane and sodium diethyldithiocarbamate were dissolved in tetrahydrofuran at a ratio of 1:1 to obtain mixed solution a and mixed solution b respectively. Then slowly add b to a, stir at room temperature for 5 hours, filter the precipitate, and then remove the solvent by vacuum distillation at 170°C to obtain a free radical that can react with the hydroxyl group on the surface of nanoparticles and has an initiating monomer to carry out active free radicals The viscous liquid CNS (I) of polymerization function, standby;

[0032]Nano-SiC is placed in a mixture of concentrated nitric acid and concentrated sulfuric acid with a volume ratio of 3:1, refluxed at 95°C for 10 h, then centrifugally filtered, washed with deionized water, and dried in a drying oven for 15 h to obtain hydroxylated SiC. Nanoparticles, spare;

[0033] Dissolve a certain amount of CNS(I) in toluene, then add quantitatively the above-mentioned hydroxylated nanoparticles,...

Embodiment 2

[0037] γ-Chloropropyltrimethoxysilane and sodium dimethyldithiocarbamate were dissolved in tetrahydrofuran respectively according to the substance ratio of 1:1, and mixed solution a and mixed solution b were correspondingly obtained. Then slowly add b to a, stir at room temperature for 2 hours, filter the precipitate, and then remove the solvent by vacuum distillation at 160°C to obtain a free radical that can react with the hydroxyl group on the surface of nanoparticles and has an initiating monomer to carry out active free radicals Polymerized viscous liquid CNS (II), standby;

[0038] nano-SiO 2 Place in a mixture of concentrated nitric acid and concentrated sulfuric acid with a volume ratio of 3:1, reflux at 85°C for 5 hours, then centrifugally filter, wash with deionized water, and dry in a drying oven for 8 hours to obtain hydroxylated nanoparticles ,spare;

[0039] Using tetrahydrofuran as a solvent, dissolve a certain amount of CNS(II), then add a quantitative amount...

Embodiment 3

[0043] 4-(Chloromethyl)phenyltrimethoxysilane and potassium diethyldithiocarbamate are dissolved in tetrahydrofuran respectively according to the substance ratio of 1:1, and corresponding mixed solution a and mixed solution b are obtained . Then slowly add b to a, stir at room temperature for 3 hours, filter the precipitate, and then remove the solvent by vacuum distillation at 165°C to obtain a free radical that can react with the hydroxyl group on the surface of nanoparticles and has an initiating monomer to carry out active free radicals The viscous liquid CNS (III) of polymerization function, standby;

[0044] Nano-MgO was placed in a mixture of concentrated nitric acid and concentrated sulfuric acid with a volume ratio of 3:1, refluxed at 90°C for 8 hours, then centrifugally filtered, washed with deionized water, and dried in a drying oven for 12 hours to obtain hydroxylated Nanoparticles, spare;

[0045] Use toluene as a solvent to dissolve a certain amount of CNS(III)...

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Abstract

The invention relates to a method for preparing polyolefin-based complex fiber through modified nano-particles. The method comprises the following steps of: implementing hydroxylation to nano-particles, enabling the nano-particles to react with a prepared reagent with a function of initiating living radical polymerization of a monomer, implementing photo-initiated living radical polymerization grafting to the monomer on the surfaces of the nano-particles to form nano-particles covered by multiple layers of organic casings, and mixing the nano-particles with polyolefin to obtain the polyolefin-based complex fiber. The method, in comparison with the prior art, is convenient and simple to operate, and simultaneously, the method can be used for effectively controlling grafting generations of the monomer; the method is high in grafting rate, and molecular chains grated to the surfaces of the nano-particles are narrow in molecular weight distribution, so that compatibility of the nano-particles with the polyolefin as well as dispersion of the nano-particles in the polyolefin are greatly improved; the polyolefin-based complex fiber which is enhanced in mechanical property can be prepared with a low additive amount.

Description

technical field [0001] The invention belongs to the field of advanced composite materials, and in particular relates to a method for preparing polyolefin-based composite fibers by organically modifying multilayer core-shell nanoparticles. Background technique [0002] Polyolefin fiber has the advantages of easy processing, large output, low price, water resistance, stable chemical properties, etc., so it has a wide range of application fields. However, the disadvantages of low strength, heat resistance, easy deformation, and easy combustion restrict its application in various fields. Therefore, it is of great significance to modify polyolefin to further improve its performance. Filling modification is one of the well-known methods of modifying polyolefin fibers. The rigidity, heat resistance, and dimensional stability of polyolefins can be improved by adding inorganic fillers, but this often reduces the toughness of polyolefins. When the particle size of the powder filler ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F6/46D01F1/10C08F292/00C08F2/48
Inventor 赵文静麦永懿张炜叶纯麟李建龙李志
Owner SHANGHAI RES INST OF CHEM IND
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