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Self-charging non-woven fabric with spray-loaded micro-nano particles and its preparation method and application

A micro-nano particle, self-charging technology, applied in separation methods, chemical instruments and methods, membrane technology, etc., can solve the problems of difficult molding, poor electrostatic durability, and high filtration resistance, achieve high ability to store electrostatic charges, increase load The effect of fastness

Active Publication Date: 2022-04-22
JIANGSU YIMAO FILTER MEDIA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because PTFE cannot be dissolved by general methods, it cannot be produced by solution spinning; and because of the high melt viscosity of PTFE (1010-1012Pa·s at 350°C), it will not turn into a viscous flow when heated to 415°C state, it only forms an amorphous gel-like substance, which is difficult to shape, so it cannot be processed by melt spinning
Therefore, in the prior art, spinning is mainly carried out by dispersing PTFE micropowder in the spinning solution, which has the problems of poor electrostatic durability and reduced mechanical properties.
In addition, the prepared nonwoven materials usually need post-treatment methods such as applying a strong external electric field to polarize the electret material, and then remove the electric field to store the charge on the surface or inside of the dielectric. Influenced by environmental conditions, in hot and humid environments, the charge attenuation is serious, which reduces the filtration efficiency and makes it difficult to adapt to people's use conditions
[0004] For example, the invention patent with the application number CN201610803294.0 discloses a polytetrafluoroethylene-polypropylene composite electret air filter material, which is obtained by mixing silicon nanowires, a mixture of polytetrafluoroethylene suspended fine powder and sodium chloride, and polytetrafluoroethylene Propylene is added into the twin-screw compounding extruder to melt and extrude to obtain polypropylene composite masterbatch, and then melt-blown spinning and corona discharge electret treatment are performed to obtain PTFE-PP composite electret Although the filtration efficiency of this material reaches 99.98%, the filtration resistance is as high as 88.92Pa, and the preparation method is complicated, the production cost is high, and it is not suitable for large-scale production

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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  • Self-charging non-woven fabric with spray-loaded micro-nano particles and its preparation method and application
  • Self-charging non-woven fabric with spray-loaded micro-nano particles and its preparation method and application
  • Self-charging non-woven fabric with spray-loaded micro-nano particles and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A self-charging non-woven fabric loaded with micro-nano particles by spraying, which is composed of polypropylene fibers and polytetrafluoroethylene micro-nano particles loaded on the surface of the polypropylene fibers. The average particle size of the polytetrafluoroethylene is 300nm. Prepared by melt-blown method, the details are as follows:

[0040] S1. Melt the dried polypropylene spinning raw material in a twin-screw extruder and spray it out from the spinneret hole for melt spinning;

[0041] Among them, the polypropylene melt extrusion temperature is 240°C, the spinneret aperture is 0.16mm, and the receiving distance is 15cm;

[0042] S2. The polymer melt fiber is sprayed with the melt-blown air flow dispersed with polytetrafluoroethylene micro-nano particles, so that the polytetrafluoroethylene micro-nano particles are sprayed and loaded onto the surface of the polypropylene fiber melt along with the air flow to obtain a surface load Polypropylene fibers of po...

Embodiment 2～16

[0049] The spray-loaded self-charging non-woven fabrics provided in Examples 2-16 are all composed of polypropylene fibers and polytetrafluoroethylene micro-nano particles loaded on the surface of the polypropylene fibers. Compared with Example 1, the difference lies in that the particle size and preparation conditions of polytetrafluoroethylene micro-nano particles are shown in Table 1, and the others are basically the same as in Example 1, and will not be repeated here.

[0050] Table 1 Example 2~16 particle size and preparation conditions of polytetrafluoroethylene micro-nano particles

[0051]

[0052]

[0053] The load and load fastness of the self-charging non-woven fabrics of blown-loaded micro-nano particles provided in Examples 2-16 are shown in Table 2, as can be seen from Example 1 and Examples 2-4, with the As the particle size of fluoroethylene micro-nano particles increases, the loading capacity gradually decreases. This is because when the particle size of...

Embodiment 17

[0063] A self-charging non-woven fabric loaded with micro-nano particles by spraying, which is composed of polyethylene fibers and polytetrafluoroethylene micro-nano particles loaded on the surface of polyethylene fibers. The average particle diameter of the polytetrafluoroethylene is 300nm. Compared with Example 1, the preparation method is different in that the polyethylene melt extrusion temperature is 230° C., and the others are roughly the same as Example 1, and will not be repeated here.

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Abstract

The invention provides a self-charging non-woven fabric loaded with micro-nano particles by blowing and its preparation method and application. By adding micro-nano particles with high dielectric constant difference in the air flow of conventional melt-blown processing, Under the action of blowing, it is loaded on the surface of the polymer melt fiber to prepare a self-charging non-woven fabric. Under the action of air purging, the micro-nano particles with high dielectric constant difference are electrified by friction to realize the storage of electrostatic charge. The self-charging non-woven fabric prepared by the present invention is applied to air filter materials, and its filtration efficiency is ≥ 99.5%, and the filtration resistance is ≤ 30Pa; in the case of air circulation, the micro-nano particles with high dielectric constant difference can interact with the surrounding polymer The fibers are repeatedly contacted and separated to continuously generate static charges, thereby improving the durability of the electrostatic properties of the filter material and effectively solving the problem of easy attenuation of charges.

Description

technical field [0001] The invention belongs to the technical field of air filter materials, and in particular relates to a self-charging non-woven fabric sprayed with micro-nano particles and its preparation method and application. Background technique [0002] Due to its unique structural shape, fiber filter material has become one of the main driving forces for the development of filtration technology. Compared with other filtration technologies, fiber filtration technology is mainly composed of random piled fiber materials, and fiber materials have strong controllability of fiber diameter / pore size, high porosity, controllable accumulation form and better environment. Adaptability and other advantages, so that it has excellent filtration performance. Fiber air filtration is a process for separating dust particles suspended in the air. Its filtration mechanism mainly includes: gravity effect, inertia effect, interception effect, diffusion effect and electrostatic effect....

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D39/08
CPCB01D39/083B01D2239/10B01D2239/0435B01D2239/0622B01D2239/0208
Inventor 王亚飞吴龙涛朴一镛宋宝祥刘欣吴子航陈凯
Owner JIANGSU YIMAO FILTER MEDIA CO LTD
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