A method of making a filter material

A production method and filter material technology, applied in separation methods, chemical instruments and methods, filtration separation, etc., can solve the problems of inability to effectively replenish fine particles, unstable antibacterial effect, low air permeability, etc., and achieve good organic high polymer Biocompatibility, good for environmental protection, and good degradability

Active Publication Date: 2022-04-22
GUANGZHOU TRACE ELEMENTS BIOLOGICAL TECH CO LTD
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In the market, polyethylene melt-blown non-woven fabrics have large pores formed by the accumulation of fibers, which cannot effectively replenish fine particles, and the filtration efficiency of particles with a particle size of 0.3 μm is below 50%; while polytetrafluoroethylene microporous membranes rely purely on physical Filtration, which means smaller pores and less air permeability
Moreover, for masks, the antibacterial properties of the filter layer are also very important, and the filter layers of masks on the market generally obtain antibacterial properties by loading silver, copper, tin, zinc and other antibacterial metal ions on their surface. However, the antibacterial effect obtained in this way is not stable

Method used

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  • A method of making a filter material

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preparation example Construction

[0029] The preparation steps of ferulic acid-chitosan graft copolymer comprise:

[0030] Step A: Dissolve chitosan powder in citric acid-sodium citrate buffer solution with a pH value of 5.5, add 80mL of 30% hydrogen peroxide solution, and react at 65°C for 90min to obtain chitosan with a chitosan concentration of 100mmol solution; when the chitosan solution is cooled to room temperature, add 10 mL of methanol solution and laccase that are dissolved with ferulic acid in sequence, and stir evenly to obtain a mixed solution. The concentration of ferulic acid in the mixed solution is 10 mmol, and the density of laccase is 3.0U / mL;

[0031] Step B: Introduce oxygen into the mixed solution, and the oxygen flow rate is 35 L / min. After the mixed solution is reacted for 2.5 hours, dialyze with a molecular weight 14000 dialysis membrane for 72 hours to remove unreacted ferulic acid, and use methanol, The chitosan-ferulic acid graft copolymer was obtained after thorough rinsing with et...

Embodiment 1

[0040] A method for making a filter material, specifically comprising the following steps:

[0041] Step 1: Melt and blend ferulic acid-chitosan graft copolymer, polycaprolactone and polypropylene at a mass ratio of 5:10:85, and use melt-blown technology to obtain a non-woven fabric layer, a non-woven fabric The fiber diameter of the layer is 135-142nm, the air permeability is 0.6m / s, and the thickness is 1mm;

[0042] Step 2: Add silver-loaded nano-titanium dioxide powder with a particle size of 10 to 15 nm into 500 parts by weight of deionized water to prepare silver-loaded nano-TiO with a concentration of 0.5 mg / mL 2 Dispersion liquid, then add 50 parts of polyvinylpyrrolidone and 1 part of ammonium persulfate, use ultrasonic dispersion method to fully mix, and spray evenly on both sides of the surface of the non-woven fabric layer by XKD-AS600 spraying machine, the spraying pressure is 0.05 Mpa, spray volume 0.05ml / cm2;

[0043] Step 3: Prepare and prepare polytetrafluor...

Embodiment 2

[0047] A method for making a filter material, specifically comprising the following steps:

[0048] Step 1: Melt and blend ferulic acid-chitosan graft copolymer, menthol essential oil, polycaprolactone and polypropylene at a mass ratio of 5:1:9:85, and use melt-blowing technology to obtain a nonwoven For the cloth layer, the fiber diameter of the non-woven fabric layer is 137-151nm, the air permeability is 0.6m / s, and the thickness is 1mm;

[0049] Step 2: Add silver-loaded nano-titanium dioxide powder with a particle size of 10 to 15 nm into 500 parts by weight of deionized water to prepare silver-loaded nano-TiO with a concentration of 0.5 mg / mL 2 Dispersion liquid, then add 50 parts of polyvinylpyrrolidone and 1 part of ammonium persulfate, use ultrasonic dispersion method to fully mix, and spray evenly on both sides of the surface of the non-woven fabric layer by XKD-AS600 spraying machine, the spraying pressure is 0.05 Mpa, spray volume 0.05ml / cm2;

[0050] Step 3: Prep...

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Abstract

The invention relates to a method for making a filter material. First, ferulic acid-chitosan graft copolymer, polycaprolactone and polypropylene are melt-blended at a mass ratio of 1-5:1-10:70-90 , adopting melt-blowing technology to obtain a non-woven fabric layer; secondly, using polyvinylpyrrolidone and ammonium persulfate solution to carry out surface modification treatment on the obtained non-woven fabric layer, and loading silver-loaded nano-titanium dioxide powder on the surface of the non-woven fabric layer; Then prepare a polytetrafluoroethylene microporous membrane with a thickness no more than 1mm, and heat-compress the polytetrafluoroethylene microporous membrane with the non-woven fabric layer obtained in step 2 to obtain a composite filter layer; corona is performed on the obtained composite filter layer process, storing a charge density of 3 x 10 ‑4 ~5.7×10 ‑3 C / m 2 ; Finally, the waterproof non-woven fabric layer and the spunlace non-woven fabric layer are respectively composited on both sides of the obtained composite filter layer. The filter material of the present application has good filtering effect, good air permeability, and the fiber has good chemical stability, thermal stability, hydrophilicity and antibacterial property.

Description

technical field [0001] The invention relates to the field of mask filter materials, in particular to a method for making filter materials. Background technique [0002] A mask is a kind of hygiene product, which is generally worn on the mouth and nose to filter the air entering the mouth and nose, so as to block harmful gases, odors, droplets, viruses and other substances, and is made of gauze or paper. The mask has a certain filtering effect on the air entering the lungs. When respiratory infectious diseases are prevalent, when working in a polluted environment such as dust, wearing a mask has a very good protective effect. The mask is generally divided into three layers, the water absorption layer, the filter layer and the waterproof layer, and the filter layer plays the main role. At present, the filter layer used for masks is mainly polyethylene melt-blown non-woven fabric or polytetrafluoroethylene microporous membrane. Polyethylene melt-blown non-woven fabric has good...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D39/08B01D46/00A41D31/30A41D31/14A41D31/12A41D31/04A41D31/02A41D13/11D06M15/356D06M11/46D06M11/83C08B37/08D06M10/02D06M101/32D06M101/20D06M101/10
CPCB01D39/08B01D46/0001B01D46/0028A41D13/1192A41D31/02A41D31/30A41D31/12A41D31/14A41D31/04D06M15/3562D06M11/46D06M11/83D06M16/00C08B37/003D06M10/025A41D2500/30D06M2101/32D06M2101/20D06M2101/10
Inventor 刘既辉程建强曾令武
Owner GUANGZHOU TRACE ELEMENTS BIOLOGICAL TECH CO LTD
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