CN101874951A - Biodegradable electret melt-spurt filtering material and production method - Google Patents
Biodegradable electret melt-spurt filtering material and production method Download PDFInfo
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- CN101874951A CN101874951A CN2009102486085A CN200910248608A CN101874951A CN 101874951 A CN101874951 A CN 101874951A CN 2009102486085 A CN2009102486085 A CN 2009102486085A CN 200910248608 A CN200910248608 A CN 200910248608A CN 101874951 A CN101874951 A CN 101874951A
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Abstract
The invention discloses a biodegradable electret melt-spurt filtering material with the advantages of energy-saving, consumption reduction, 100 percent degradation in the natural environment and high filtering efficiency and a production method. The biodegradable electret melt-spurt filtering material is prepared form PLA slices with melting index of 500-800g/10min (2.16kg, 230 DEG C) by the process steps of charging, screw rod melting extrusion, die head spinning, drawing, wet formation and high-voltage electric field electret. In the step of screw rod melting extrusion, the temperature of screw rods in each region is between 185 and 215 DEG C, the temperature of a filter is between 215 and 220 DEG C, the temperature of a metering pump is 215 DEG C and the pressure of the screw rod is 25bar; in the step of die head spinning, the temperature of the die head in each region is between 210 and 220 DEG C; in the step of drawing, the air pressure of the drawing is 0.75bar and the air temperature of the drawing is 220 DEG C; in the step of wet formation, the negative pressure of the absorption is 0.036bar, and the distance between a wet forming machine and a die head spinning jet plate is 100mm; and the step of high-voltage electric field electret is to enable a PLA fiber web to pass through a 50kV electric field.
Description
Technical field:
The present invention relates to a kind of electret melt-blown filtering material and production method, especially a kind of energy-saving and cost-reducing, can be in natural environment absolutely degraded and high biodegradable electret melt-blown filtering material and the production method of filter efficiency.
Background technology:
Electret melt-blown filtering material is one of main material of medical protection aspect, and particularly during epidemic virus was wreaked havoc, this material was widely used especially.It is raw material that existing electret melt-blown filtering material mainly adopts height to melt finger PP (polypropylene), method by melt spinning and high pressure electret is made, there are the following problems: PP is made by petrochemical materials, and oil is non-renewable resources, can not satisfy energy-saving and cost-reducing requirement; PP also belongs to nondegradable material simultaneously, after the filtering product of being produced is discarded, is difficult for degraded in natural environment, needs certain expense that it is disposed, and causes economic waste and environmental pollution.
PLA (PLA) is a kind of novel Biodegradable material, be to make, can be degraded fully by the occurring in nature microorganism after use is discarded, generate carbon dioxide and water with the starch material that reproducible plant resources (as corn) is refined, environmentally safe is the environment-friendly material of generally acknowledging.When incinerating PLA (PLA), its combustion heat value is identical with the incineration stationery and can never discharge toxic gases such as nitride, sulfide.
Because the electret melt-blown filtering material production process is comparatively complicated, comprise that material loading, screw rod melt extruded, die head spinning, drawing-off etc. form superfine fibre, melt-blowing nonwoven is made in bonding on the moulding lace curtaining again, cooling, step such as electret in high voltage electric field then, the technological parameter of each step is most important, therefore, also be not the relevant report that raw material is produced electret melt-blown filtering material up to now with the PLA.
Summary of the invention:
The present invention saves energy and reduce the cost, can absolutely degrade and high biodegradable electret melt-blown filtering material and the production method of filter efficiency in natural environment in order to solve the existing the problems referred to above of prior art and raw material, to provide a kind of.
Technical solution of the present invention is: a kind of biodegradable electret melt-blown filtering material is characterized in that with the PLA section being the electret melt spinning filtering material of raw material.
A kind of above-mentioned biodegradable electret melt-blown filtering material production method comprises material loading, screw rod melt extruded, die head spinning, drawing-off, one-tenth net and high voltage electric field electret, it is characterized in that:
A. described material loading step is that the PLA section of 500～800g/10min (2.16kg, 230 ℃) is delivered in the hopper by sucktion fan with melt index;
It is 185～215 ℃ that the screw rod of b. described screw rod melt extruded step is respectively distinguished temperature, and filter temperature is 215～220 ℃, and the measuring pump temperature is 215 ℃, and screw pressure is 25bar;
The die head of c. described die head spinning step is respectively distinguished temperature at 210～220 ℃;
D. the drawing-off blast of described drafting step is 0.75bar, and the drawing-off wind-warm syndrome is 220 ℃;
The absorption negative pressure of e. described one-tenth net step is 0.036bar, and the distance between lapper and die head spinneret is 100mm, forms the PLA fleece;
F. described high voltage electric field electret step is that the 50kV electric field is crossed by zein fiber Netcom.
The present invention compares with prior art, has following advantage:
1. PLA section of the present invention derives from the crops (corn, rice, sucrose, beet, Ipomoea batatas and potato etc.) of the Nature, is renewable resource, compares with non-renewable resources-oil product PP, PE, and its cost is relatively low.
2. the present invention has the natural degradation function, can absolutely degrade in natural environment, imbed underground 2～3 months after discarding, but just natural degradation becomes required water of plant growth and carbon dioxide, and environment without any pollution, is belonged to environment-friendly products;
3. product of the present invention is soft, have drapability, after the high pressure electret, electric charge is directly in the middle of the income fiber and be permanently stored in its inside, melt-blown filter materials behind the electret to particle diameter be the filter efficiency of particle of 3 μ m up to 99%, these performance indications can not decay because of the variation of external environment; Owing to be permanent electret, after this kind material was made mouth mask, its application was not limited by ambient humidity, can be applied in the every field such as medical treatment, health, industry, agricultural.
4. product fusing point of the present invention lower (170 ℃), temperature was controlled at about 210 ℃ and gets final product when it was produced, and the production temperature that melts and sprays product than PP is hanged down 40 ℃～50 ℃, has reduced the energy resource consumption that produces for heating.
The specific embodiment:
The production method of the embodiment of the invention is the same with prior art, comprises material loading, screw rod melt extruded, die head spinning, drawing-off, one-tenth net and high voltage electric field electret step, and difference from prior art is:
A. described material loading step is to be that the PLA section of 500～800g/10min (2.16kg, 230 ℃) is delivered in the hopper by sucktion fan with melt index;
It is 185～215 ℃ that the screw rod of b. described screw rod melt extruded step is respectively distinguished temperature, and filter temperature is 215～220 ℃, and the measuring pump temperature is 215 ℃, and screw pressure is 25bar, to guarantee 185 ℃ of melt temperatures, melt pressure 9bar;
The die head of c. described die head spinning step is respectively distinguished temperature at 210～220 ℃, for preventing the degraded of PLA molten mass, the heating-up temperature in each district of die head can not too high (210～220 ℃), the path that enters die head because of melt is different in size, for guaranteeing the uniformity of melt flows, the path of die head both sides is longer, and temperature is preferably near 220 ℃, the path of zone line die head is shorter, and temperature is preferably near 210 ℃;
D. the silk by the spinneret ejection needs drawing-off wind that its drawing-off is become superfine fibre, but wind-warm syndrome, blast all have very big influence to the moulding of silk and the soft or hard degree of feel, thereby the wind-warm syndrome of drawing-off wind is set at 220 ℃, and blast is 0.75bar, and the PLA fibre diameter of institute's drawing-off is 2～6 μ m;
E. because the production temperature of PLA fiber is lower, promptly Pen Chu silk temperature is lower, thereby its cool time is shorter, for guaranteeing the cloth cover brute force, must before the silk cooling, strengthen its intermeshing degree on the moulding lace curtaining, so the absorption negative pressure is 0.036bar, distance between moulding lace curtaining and die head spinneret (DCD value) is little, be 100mm, the PLA fiber is sprayed directly on on the lace curtaining after being cooled off by the air at room temperature of die head both sides, forms the PLA fleece;
F. described high voltage electric field electret step is that the zein fiber net is passed through the 50kV electric field according to the speed of prior art, both HV generator was that 14mA is added on the static emission bar with 50kV voltage, electric current, make to form a high-voltage electrostatic field between emitter stage and the receiving pole, again PLA fabric nonwoven cloth into the net is finished electret by high voltage electric field.
Concrete parameter such as table 1:
Table 1
The product of the embodiment of the invention is 25g/m
2', it is as shown in table 2 that TSI8130 32L/min tests the test result of fibre fineness of its filter efficiency, respiratory resistance and product:
Table 2
| Test item | The embodiment of the invention |
| Grammes per square metre (g/m 2) | ??25 |
| Thickness (mm) | ??0.25 |
| Fibre diameter (μ m) | ??2～7 |
| Respiratory resistance (mmH 2O) | ??2.0 |
| Filter efficiency (%) | ??99.2 |
Claims (2)
1. a biodegradable electret melt-blown filtering material is characterized in that with the PLA section being the electret melt spinning filtering material of raw material.
2. a biodegradable electret melt-blown filtering material production method as claimed in claim 1 comprises material loading, screw rod melt extruded, die head spinning, drawing-off, one-tenth net and high voltage electric field electret, it is characterized in that:
A. described material loading step is that 500～800g/10min, 230 ℃, the PLA of 2.16kg section deliver in the hopper by sucktion fan with melt index;
It is 185～215 ℃ that the screw rod of b. described screw rod melt extruded step is respectively distinguished temperature, and filter temperature is 215～220 ℃, and the measuring pump temperature is 215 ℃, and screw pressure is 25bar;
The die head of c. described die head spinning step is respectively distinguished temperature at 210～220 ℃;
D. the drawing-off blast of described drafting step is 0.75bar, and the drawing-off wind-warm syndrome is 220 ℃;
The absorption negative pressure 0.036bar of e. described one-tenth net step, the distance between lapper and die head spinneret is 100mm, forms the PLA fleece;
F. described high voltage electric field electret step is by the 50kV electric field with the PLA fleece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2009102486085A CN101874951A (en) | 2009-12-22 | 2009-12-22 | Biodegradable electret melt-spurt filtering material and production method |
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| CN2009102486085A CN101874951A (en) | 2009-12-22 | 2009-12-22 | Biodegradable electret melt-spurt filtering material and production method |
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| CN101874951A true CN101874951A (en) | 2010-11-03 |
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| CN2009102486085A Pending CN101874951A (en) | 2009-12-22 | 2009-12-22 | Biodegradable electret melt-spurt filtering material and production method |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102267257A (en) * | 2011-06-16 | 2011-12-07 | 大连瑞光非织造布集团有限公司 | Elastic composite non-woven material and production method |
| CN103520998A (en) * | 2013-10-24 | 2014-01-22 | 嘉兴学院 | Polylactic acid filament yarn non-woven filter material and application thereof |
| CN107475892A (en) * | 2017-07-28 | 2017-12-15 | 深圳中纺滤材科技有限公司 | A kind of PLA melt-blown filter materials and preparation method thereof |
| CN107754490A (en) * | 2017-11-29 | 2018-03-06 | 苏州市海朋电子商务有限公司 | A kind of degraded filter certainly for hand held cleaner |
| CN108708079A (en) * | 2018-06-11 | 2018-10-26 | 上海精发实业股份有限公司 | High temperature resistant polylactic acid is meltblown electret non-woven filter material and its preparation method and application |
| CN112899886A (en) * | 2021-01-20 | 2021-06-04 | 滁州爸爸的选择科技有限公司 | Polylactic acid degradable melt-blown nonwoven material and preparation method thereof |
| CN114832505A (en) * | 2021-01-15 | 2022-08-02 | 中国科学院化学研究所 | Biomass-based air filtering material and preparation method and application thereof |
-
2009
- 2009-12-22 CN CN2009102486085A patent/CN101874951A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102267257A (en) * | 2011-06-16 | 2011-12-07 | 大连瑞光非织造布集团有限公司 | Elastic composite non-woven material and production method |
| CN103520998A (en) * | 2013-10-24 | 2014-01-22 | 嘉兴学院 | Polylactic acid filament yarn non-woven filter material and application thereof |
| CN103520998B (en) * | 2013-10-24 | 2016-03-02 | 嘉兴学院 | A kind of Polylactic acid filament yarn non-woven filter material and application thereof |
| CN107475892A (en) * | 2017-07-28 | 2017-12-15 | 深圳中纺滤材科技有限公司 | A kind of PLA melt-blown filter materials and preparation method thereof |
| CN107754490A (en) * | 2017-11-29 | 2018-03-06 | 苏州市海朋电子商务有限公司 | A kind of degraded filter certainly for hand held cleaner |
| CN108708079A (en) * | 2018-06-11 | 2018-10-26 | 上海精发实业股份有限公司 | High temperature resistant polylactic acid is meltblown electret non-woven filter material and its preparation method and application |
| CN108708079B (en) * | 2018-06-11 | 2021-07-13 | 上海精发实业股份有限公司 | High-temperature-resistant polylactic acid melt-blown electret non-woven filter material and preparation method and application thereof |
| CN114832505A (en) * | 2021-01-15 | 2022-08-02 | 中国科学院化学研究所 | Biomass-based air filtering material and preparation method and application thereof |
| CN112899886A (en) * | 2021-01-20 | 2021-06-04 | 滁州爸爸的选择科技有限公司 | Polylactic acid degradable melt-blown nonwoven material and preparation method thereof |
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Application publication date: 20101103 |