Needled/melt-blown/spunbond composite filter material and preparation method thereof

A compound filtration and acupuncture technology, applied in the direction of filtration separation, membrane filter, separation method, etc., can solve the problems of rising filtration resistance, high filtration efficiency, low filtration resistance, large dust holding capacity, small pore size, etc., to delay filtration resistance The rise of industrialization is easy, and the effect of improving electret performance

Active Publication Date: 2020-02-11
NANTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent CN106890506A discloses a low-impedance high-efficiency air filter material, which uses needle-punched material as the base layer and electrospun film as the surface layer. However, due to the characteristics of small fiber diameter and small pore size of the electrospun material, it is easy to block as a surface filter material. , causing a sharp rise in filter resistance
Patent CN106076000A discloses a multi-layer melt-blown composite filter material with the addition of energy-enhancing additives, including the dust-facing surface layer melt-blown material, the middle layer melt-blown material and the fine filter layer melt-blown material, wherein each layer of melt-blown material is Energizers are added, but the melt-blown material has the problem of high filtration resistance, especially after a period of loading and filtration, the resistance rises sharply
[0004] Generally speaking, the current air filter materials are still difficult to meet the requirements of performance indicators such as high filtration efficiency, high filtration efficiency stability, low filtration resistance and large dust holding capacity at the same time.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Preparation of modified masterbatch:

[0034] Add 100g of energizer (containing 80g of 1,3-2,4-bis(3,4-dimethylbenzylidene) sorbitol and 20g of calcium stearate) and 500g of polypropylene slices into the granulator The two feeding hoppers were melted and extruded at 200°C, cooled in a water bath, cut into pellets, and then dried to obtain modified polypropylene masterbatches. Then take 500g of modified polypropylene masterbatches and 10,000g of polypropylene The slices were mixed to obtain mixed pellets.

[0035] (2) Preparation of needle-punched materials for the dust-facing layer:

[0036] Using a spinning web device, the fineness of the prepared fiber is 4D, and the surface density is 40g / m 2 , a polypropylene filament fiber web with a thickness of 0.40 mm, and then undergoes acupuncture reinforcement treatment. The acupuncture process includes one pre-acupuncture and two main acupuncture reinforcements. The acupuncture density is 150 punches / cm 2 , acupunctur...

Embodiment 2

[0042] (1) Preparation of modified masterbatch:

[0043] Add 100g of energizer (containing 70g of 1,3-2,4-bis(3,4-dimethylbenzylidene) sorbitol and 30g of calcium stearate) and 550g of polypropylene slices into the granulator The two feeding hoppers were melted and extruded at 200°C, cooled in a water bath, cut into pellets, and then dried to obtain modified polypropylene masterbatches. Then take 800g of modified polypropylene masterbatches and 10,000g of polypropylene The slices were mixed to obtain mixed pellets.

[0044] (2) Preparation of needle-punched materials for the dust-facing layer:

[0045] A spinning web device is used to prepare a polypropylene filament fiber web with a fiber fineness of 1.5D, a surface density of 200g / m2, and a thickness of 2.00mm, and then undergoes acupuncture reinforcement treatment. The acupuncture process includes a pre-acupuncture, Reinforced with two main needles, the needle density is 200 pricks / cm 2 , acupuncture depth 8mm;

[0046]...

Embodiment 3

[0051] (1) Preparation of modified masterbatch:

[0052] Add 100g of energizer (containing 60g of 1,3-2,4-bis(3,4-dimethylbenzylidene) sorbitol and 40g of calcium stearate) and 600g of polypropylene chips into the granulator The two feeding hoppers were melted and extruded at 200°C, cooled in a water bath, cut into pellets, and then dried to obtain the modified polypropylene masterbatch, and then take 1000g of modified polypropylene masterbatch and 10000g of polypropylene The slices were mixed to obtain mixed pellets.

[0053] (2) Preparation of needle-punched materials for the dust-facing layer:

[0054] A spinning web device is used to prepare a polypropylene filament fiber web with a fiber size of 1D, an area density of 300g / m2, and a thickness of 3.00mm, and then undergoes acupuncture reinforcement treatment. The acupuncture process includes a pre-acupuncture, two Daozhu acupuncture reinforcement, the acupuncture density is 200 pricks / cm 2 , acupuncture depth 10mm;

[...

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Abstract

The invention belongs to the technical field of air filter materials, and discloses a needled / melt-blown / spunbond composite filter material and a preparation method thereof. The preparation method comprises the steps that modified polypropylene master-batches are mixed with polypropylene slices, and then mixed granules are obtained; the mixed granules are made into a polypropylene fiber net, and needling reinforcement is conducted to obtain a dust-facing layer needled material; a fine filter layer melt-blown material is prepared from the mixed granules; polypropylene slices are made into a polypropylene fiber net, and hot-rolling reinforcement is conducted to obtain a supporting layer spunbond material; and the dust-facing layer needled material, the fine filter layer melt-blown material and the supporting layer spunbond material are placed on an electret condensing device to be subjected to electret condensing simultaneously, and online compositing is conducted through electrostatic attraction to obtain the needled / melt-blown / spunbond composite filter material. The composite filter material prepared by the preparation method can reduce filtration resistance and delay rising of thefiltration resistance in the loading filtration process to intercept small-particle-size particles, and the filtration efficiency and stability are higher.

Description

technical field [0001] The invention relates to the technical field of air filter materials, in particular to a needle-punched / melt-blown / spun-bonded composite filter material and a preparation method thereof. Background technique [0002] PM2.5 particles in the air have the characteristics of relatively small size, long life, and wide spread. They can easily enter the lungs through the human respiratory system, causing lung diseases, heart diseases, and premature death. Therefore, how to prepare Effective air filter materials are a major problem that needs to be solved urgently. [0003] Patent CN103537142A discloses a needle-punched electrostatic cotton filter material, but no effective energizing agent is added in the preparation process, so there are problems of poor electrostatic attraction effect and serious attenuation of filtration efficiency after a period of time. Patent CN206534167U discloses a kind of anti-smog mask main material and mask, including needle-punch...

Claims

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Application Information

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IPC IPC(8): B01D39/16B01D46/54B01D46/00
CPCB01D39/1623B01D46/0001B01D46/546B01D2239/0208B01D2239/0407B01D2239/0609B01D2239/0622B01D2239/0627
Inventor 张海峰葛明政张伟张瑜李素英付译鋆张钟雷
Owner NANTONG UNIVERSITY
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