Microwave shielding fiber and fabricating method

A microwave and fiber technology is applied in the field of microwave shielding fiber and its manufacturing to achieve the effects of improving electrical conductivity, improving shielding radio waves, and improving antistatic

Inactive Publication Date: 2005-11-16
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no public report on the literature about fibers that include microwave shielding fu...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Get 89.8 parts of polyethylene terephthalate after drying (weight, the same below), the average particle diameter is 0.01 μ m and 10 parts of surface-treated carbon black powder, γ-glycidyloxypropyl trimethoxy 0.2 parts of base silane, after being fully mixed, extruded by twin-screw at 290 ° C, granulated to produce fiber skin material; take 13 parts of polyethylene terephthalate, strontium with an average particle size of 0.6 μm 85 parts of ferrite magnetic powder, 0.5 parts of polyethylene wax, 1.5 parts of isopropyl triisostearyl titanate, after thorough mixing, twin-screw extrusion at 280 ° C, granulation, to produce the fiber core layer material; after the obtained sheath-core material is fully dried, according to the fiber sheath-core volume ratio of 2:8, the coiled yarn is spun with a skin-core composite spinning machine; then the coiled yarn is stretched 3 times at a temperature of 100°C , to obtain the finished sheath-core composite microwave shielding fiber. ...

Embodiment 2

[0026] Take 49 parts of polypropylene with a melt index of 50, 50 parts of copper powder with an average particle size of 5 μm, and 1 part of γ-methacryloxytrimethoxysilane. Extrude and granulate to produce the fiber skin layer material; get 59.4 parts of polypropylene with a melt index of 50, 40 parts of barium ferrite magnetic powder with an average particle diameter of 1 μm, and tris(dodecylbenzenesulfonyl) titanic acid 0.6 parts of isopropyl ester, after being fully mixed, extruded by twin-screw at 195°C, granulated to produce fiber core material; after fully drying the skin-core material, the fiber skin-core volume ratio is 5 : 5 Spinning coiled yarn on a sheath-core composite spinning machine; then stretching the coiled yarn 4 times at a temperature of 70° C. to obtain a sheath-core composite microwave shielding finished yarn. After measurement, the microwave reflection attenuation rate of the obtained fiber is 8db, and the X-ray shielding rate is 81%.

Embodiment 3

[0028]Take 59.2 parts of polypropylene with a melt index of 30, 40 parts of nickel powder with an average particle size of 1 μm, and 0.8 parts of N-β-(aminoethyl)-γaminopropyltrimethoxysilane. Under the temperature of ℃, it is extruded by twin-screw and granulated to produce fiber skin material; take 49 parts of polypropylene with a melt index of 30, 20 parts of barium ferrite magnetic powder, and 30 parts of NdFeB magnetic powder with an average particle size of 0.8 μm. 1 part, 1 part of isopropyl tris(dodecylbenzenesulfonyl) titanate, after being fully mixed, extruded by twin-screw at 190°C, granulated to produce fiber core material; 1. Spinning with a core volume ratio of 3:7, and then stretching the winding yarn 3 times at a temperature of 75° C., the microwave shielding fiber can be obtained. It is determined that the microwave reflection attenuation rate of the obtained fiber is 7db, and the X-ray shielding rate is 86%.

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Abstract

The invention relates to a microwave shielding fibre and its preparation method. It has a skin-core structure whose skin-core volume ratio is 2:8-6:4, skin material composition includes (by wt%) 49-89.8% of skin layer polymer, 10-50% of coductive powder and 0.2-1% of coupling agent; and the core layer material composition includes (by wt%) 13-79.7% of core layer polymer, 20-85% of microwave absorbent and 0.3-2% of compatibility. Its preparation method includes the following steps: 1. uniformly mixing materials according to the formula of skin layer material, extruding by using twin screw extruder and granulating at 180-290 deg.C to make skin layer material of said microwave hielding fibre; 2. uniformly mixing materials according to the core layer material formula, extruding and granulating at 180-280 deg.c to make core layer material; 3. using skin-core composite spinningm achine to make the skin layer material and core layer material into windup filament yarn, drawing at 70-100 deg.C to obtain the invented product.

Description

technical field [0001] The invention relates to a functional chemical fiber and a manufacturing method thereof, in particular to a microwave shielding fiber and a manufacturing method thereof. Its IPC main classification number is proposed to be Int.C1 7 D01F 10 / 00. Background technique [0002] With the rapid development of electronic technology, there are more and more appliances using microwave sources, such as microwave ovens and microwave instruments. The harm of electromagnetic waves such as microwaves to the human body has increasingly attracted people's attention. Studies have shown that the electromagnetic waves that are more harmful to the human body and difficult to protect mainly include microwave radiation and X-ray radiation. Correspondingly, the research on the effective shielding of electromagnetic waves has become an important research topic that people pay more and more attention to. There have been many patent literature reports on electromagnetic wav...

Claims

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Application Information

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IPC IPC(8): D01F1/10
Inventor 齐鲁叶建忠于斌贾华明邹建柱
Owner TIANJIN POLYTECHNIC UNIV
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