Manufacturing method for novel 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: 2020-11-24
GUANGZHOU TRACE ELEMENTS BIOLOGICAL TECH CO LTD
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  • Abstract
  • Description
  • Claims
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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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  • Manufacturing method for novel filter material
  • Manufacturing method for novel filter material
  • Manufacturing method for novel filter material

Examples

Experimental program
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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 10mL of ferulic acid-dissolved methanol solution and laccase in sequence, stir evenly to obtain a mixed solution, the concentration of ferulic acid in the mixed solution is 10mmol, and the density of laccase is 3.0U / mL;

[0031] Step B: Introduce oxygen into the mixed solution, and the oxygen flow rate is 35L / 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 ethanol and water, and ...

Embodiment 1

[0040] A method for making a novel 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 polytetr...

Embodiment 2

[0047] A method for making a novel 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...

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Abstract

The invention relates to a manufacturing method for a novel filter material. The manufacturing method comprises the steps: firstly melt blending is conducted on a ferulic acid-chitosan grafted copolymer, polycaprolactone and polypropylene according to a mass part ratio of (1-5):(1-10):(70-90), a spray melting technology is adopted, and a non-woven fabric layer is obtained; secondly, surface modification treatment is conducted on the obtained non-woven fabric layer through polyvinylpyrrolidone and an ammonium persulfate solution, and silver-loaded nano titanium dioxide powder is loaded on the surface of the non-woven fabric layer; then a polytetrafluoroethylene microporous membrane with the thickness of not more than 1 mm is prepared, and hot-pressing compositing is conducted on the polytetrafluoroethylene microporous membrane and the non-woven fabric layer obtained in the step 2 to obtain a composite filter layer; corona treatment is conducted on the obtained composite filter layer, wherein the storage charge density is 3*10<-4> to 5.7*10<-3> C / m2; and finally, a waterproof non-woven fabric layer and a spunlace non-woven fabric layer are composited on the two sides of the obtainedcomposite filter layer correspondingly. The filter material is good in filtering effect and good in air permeability, and fibers have great 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 a novel filter material. 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 h...

Claims

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Application Information

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Patent Type & Authority Applications(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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