Preparation method of filter screen for filtering lampblack

A filter screen and oil fume technology, which is applied in the field of air purification, can solve the problems of affecting the filtering effect of the filter material and the easy occurrence of holes in the dispersion liquid.

Active Publication Date: 2021-05-18
NINGBO FOTILE KITCHEN WARE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in this patent, in step (3), the fiber dispersion is directly impregnated with the base material and freeze-dried to shape. During the freeze-drying process, the dispersion is prone to holes, which affects the filtering effect of the filter material, so it needs further improvement.

Method used

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  • Preparation method of filter screen for filtering lampblack
  • Preparation method of filter screen for filtering lampblack
  • Preparation method of filter screen for filtering lampblack

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The filter screen for filtering cooking fume of this preferred embodiment comprises the following steps:

[0036] (1) Preparation of spinning solution: disperse 0.2g of hydrophilic nano fumed silica particles (purchased from Shandong Hongxing Silica Co., Ltd.) in 70mL of N,N-dimethylacetamide DMAC and 10ml Ultrasonic vibration in acetone for 30min to obtain a dispersion, then 18g of polyacrylonitrile PAN (purchased from Hubei Dechao Chemical Co., Ltd.) was added to the above dispersion, stirred in a water bath at 70°C for 2h at a speed of 200r / min, and prepared into PAN / SiO 2 solution, then add 4g of polyurethane PU (Wanhe Chemical Group Co., Ltd.), and continue to stir in a water bath at 70°C for 1h until the dissolution is complete to obtain a spinning solution with a solid content of 21.5wt%;

[0037](2) The spinning liquid is defoamed or left standing for 12 hours before spinning, and the PET non-woven fabric is used as the collecting base cloth to carry out elect...

Embodiment 2

[0045] The filter screen for filtering cooking fume of this preferred embodiment comprises the following steps:

[0046] (1) Preparation of spinning solution: Add 20g of polystyrene PS (purchased from LG Chemicals) into 80mL of N,N-dimethylformamide DMF, stir in a water bath at 70°C for 2h, with a rotation speed of 200r / min, and prepare into a PS solution, then add 2g polyvinyl butyral PVB (Shandong Kepler Biotechnology Co., Ltd.), continue to stir in a water bath at 70° C. for 1 h until the dissolution is complete, and obtain a spinning solution with a solid content of 21.5%, and then spin at 110 Heating at 100°C for 2 hours for thermal crosslinking, the crosslinking agent components will melt after heating, and the overlapping parts of the fibers will form bonding points, so that the airgel after freeze-drying has better support and is not easy to collapse;

[0047] (2) The spinning liquid is defoamed or left standing for 12 hours before spinning, and the PP non-woven fabric...

Embodiment 3

[0054] The filter screen for filtering cooking fume of this preferred embodiment comprises the following steps:

[0055] (1) Preparation of spinning solution: disperse 0.05g of hydrophobic gas-phase polytetrafluoroethylene PTFE (purchased from McLean's reagent) in 80mL of N,N-DMA and ultrasonically vibrate for 30min to obtain a dispersion, and then 15g of polymer containing fluorine Polyurethane FPU (purchased from Wanhe Chemical Group Co., Ltd.) and 1 g of hydroxyethyl carboxymethyl cellulose (HECMC) were added to the aforementioned dispersion, stirred in a water bath at 70°C for 2 h at a speed of 200 r / min, and prepared into an FPU solution , until the dissolution is complete, obtaining a spinning solution with a solid content of 16.5wt%;

[0056] (2) The spinning liquid is defoamed or left standing for 12 hours before spinning, and the ES non-woven fabric is used as the collection base cloth to carry out electrospinning on the spinning liquid: inject the prepared spinning l...

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Abstract

The invention relates to a preparation method of a filter screen for filtering lampblack. The preparation method comprises the following steps: (1) preparing a spinning solution; (2) spinning a filter membrane; (3) the method comprises the following steps: (3.1) shearing the filter membrane prepared in the step (2) into a plurality of blocks, and putting the blocks into deionized water to obtain slurry C; (3.2) dissolving a slurry stabilizer in water to obtain a solution D, and adding the solution D into the slurry C to obtain slurry E; and (4) freezing and forming the slurry finally prepared in the step (3) at the temperature of less than -60 DEG C or in a liquid nitrogen environment, and then putting the slurry into a freeze dryer for freeze-drying so as to obtain the filter screen after freeze-drying is completed. The slurry stabilizer quickly forms a gel state in the solvent, the viscosity of the solution is increased, and the slurry stabilizer also has certain adhesiveness, so that the cut nanofiber filter membrane can be stably and uniformly dispersed in the solution without sedimentation, and the filter efficiency of the filter screen prepared by freeze-drying cannot be remarkably reduced due to large holes.

Description

technical field [0001] The invention belongs to the technical field of air purification, and in particular relates to a preparation method of a filter screen for filtering cooking fume. Background technique [0002] Range hoods have become an indispensable kitchen tool for modern families. After a long period of use, a lot of grease will form inside the range hood, which will breed bacteria over time. The accumulation of grease on the fan will affect the use of the range hood (noise Therefore, it needs to be cleaned regularly, but to clean the interior, the range hood needs to be disassembled, and a professional technician needs to be invited to the door. Improper cleaning will affect the dynamic balance of the fan. [0003] The air volume of the range hood is gradually increasing, but the noise it generates is also increasing. When the range hood is turned on during cooking, voices, telephone calls, doorbells and children’s voices can hardly be heard. Even this kind of str...

Claims

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Application Information

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IPC IPC(8): B01D39/16B01D46/00D01D5/00D04H1/4291D04H1/43D04H1/4326D04H1/4334D04H1/4358D04H1/728
CPCB01D39/16B01D46/0001D04H1/43D04H1/4326D04H1/4358D04H1/4334D04H1/4291D04H1/728D01D5/003D01D5/0092D01D5/0061Y02A50/2351
Inventor 高婷婷施勇鹏郑军妹郭国良
Owner NINGBO FOTILE KITCHEN WARE CO LTD
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