CN116731426A - Melt-blown polypropylene composite material and preparation method and application thereof - Google Patents
Melt-blown polypropylene composite material and preparation method and application thereof Download PDFInfo
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- 239000004743 Polypropylene Substances 0.000 title claims abstract description 49
- -1 polypropylene Polymers 0.000 title claims abstract description 49
- 229920001155 polypropylene Polymers 0.000 title claims abstract description 49
- 239000002131 composite material Substances 0.000 title claims abstract description 28
- 238000002360 preparation method Methods 0.000 title abstract description 8
- 239000000463 material Substances 0.000 claims abstract description 45
- 239000004953 Aliphatic polyamide Substances 0.000 claims abstract description 30
- 229920003231 aliphatic polyamide Polymers 0.000 claims abstract description 30
- 229910000166 zirconium phosphate Inorganic materials 0.000 claims abstract description 29
- LEHFSLREWWMLPU-UHFFFAOYSA-B zirconium(4+);tetraphosphate Chemical compound [Zr+4].[Zr+4].[Zr+4].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O LEHFSLREWWMLPU-UHFFFAOYSA-B 0.000 claims abstract description 29
- 239000004594 Masterbatch (MB) Substances 0.000 claims abstract description 8
- 239000000178 monomer Substances 0.000 claims description 12
- 238000001914 filtration Methods 0.000 claims description 10
- 239000000155 melt Substances 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 238000001125 extrusion Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 238000005469 granulation Methods 0.000 claims description 3
- 230000003179 granulation Effects 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 229920000572 Nylon 6/12 Polymers 0.000 claims description 2
- 125000000325 methylidene group Chemical group [H]C([H])=* 0.000 claims 2
- 238000004383 yellowing Methods 0.000 abstract description 11
- 229910052739 hydrogen Inorganic materials 0.000 abstract description 10
- 239000001257 hydrogen Substances 0.000 abstract description 10
- 150000001412 amines Chemical class 0.000 abstract description 7
- 238000002425 crystallisation Methods 0.000 abstract description 6
- 230000008025 crystallization Effects 0.000 abstract description 6
- 230000009471 action Effects 0.000 abstract description 5
- YLFIGGHWWPSIEG-UHFFFAOYSA-N aminoxyl Chemical compound [O]N YLFIGGHWWPSIEG-UHFFFAOYSA-N 0.000 abstract description 5
- 239000002530 phenolic antioxidant Substances 0.000 abstract description 4
- 238000006479 redox reaction Methods 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 239000002861 polymer material Substances 0.000 abstract description 2
- 125000001570 methylene group Chemical group [H]C([H])([*:1])[*:2] 0.000 description 20
- 239000004952 Polyamide Substances 0.000 description 14
- 229920002647 polyamide Polymers 0.000 description 14
- 238000012360 testing method Methods 0.000 description 11
- 230000000694 effects Effects 0.000 description 10
- 239000000835 fiber Substances 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 7
- 230000032683 aging Effects 0.000 description 6
- 239000004750 melt-blown nonwoven Substances 0.000 description 5
- 125000003368 amide group Chemical group 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 3
- 125000001841 imino group Chemical group [H]N=* 0.000 description 3
- 238000009987 spinning Methods 0.000 description 3
- 230000002195 synergetic effect Effects 0.000 description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000002845 discoloration Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 239000002657 fibrous material Substances 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 229910021642 ultra pure water Inorganic materials 0.000 description 2
- 239000012498 ultrapure water Substances 0.000 description 2
- JEGXLJDYOKKUNM-UHFFFAOYSA-N 3-(2-phenylethenyl)cyclohexa-3,5-diene-1,2-dione Chemical compound O=C1C(=O)C=CC=C1C=CC1=CC=CC=C1 JEGXLJDYOKKUNM-UHFFFAOYSA-N 0.000 description 1
- 229920006152 PA1010 Polymers 0.000 description 1
- 239000000443 aerosol Substances 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000003679 aging effect Effects 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000010987 cubic zirconia Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000001351 cycling effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 150000002432 hydroperoxides Chemical class 0.000 description 1
- 239000000543 intermediate Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052901 montmorillonite Inorganic materials 0.000 description 1
- ODUCDPQEXGNKDN-UHFFFAOYSA-N nitroxyl Chemical compound O=N ODUCDPQEXGNKDN-UHFFFAOYSA-N 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000010094 polymer processing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
- B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/0001—Making filtering elements
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/12—Polypropene
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/413—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties containing granules other than absorbent substances
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/54—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving
- D04H1/542—Adhesive fibres
- D04H1/544—Olefin series
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/54—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving
- D04H1/56—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving in association with fibre formation, e.g. immediately following extrusion of staple fibres
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/32—Phosphorus-containing compounds
- C08K2003/321—Phosphates
- C08K2003/328—Phosphates of heavy metals
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses a melt-blown polypropylene composite material, a preparation method and application thereof, and relates to the technical field of high polymer materials. The invention provides a melt-blown polypropylene composite material which comprises the following components in parts by weight: 80-93 parts of polypropylene melt-blown material, 3-12 parts of aliphatic polyamide, 1-5 parts of zirconium phosphate and 3-5 parts of electret master batch. According to the invention, the aliphatic polyamide and zirconium phosphate are introduced into the polypropylene melt-blown material, and the crystallization capability of the material is improved through the action of hydrogen bonds in the aliphatic polyamide, so that the electrostatic electret performance of the material is improved. Zirconium phosphate has a layered structure, and can absorb nitroxyl radical generated by oxidation-reduction reaction of hindered amine in a system, so that the reaction of the nitroxyl radical and phenolic antioxidants is slowed down, and the redness and yellowing of the material are effectively reduced.
Description
Technical Field
The invention relates to the technical field of high polymer materials, in particular to a melt-blown polypropylene composite material and a preparation method and application thereof.
Background
At present, conventional polypropylene melt-blown materials often contain phenolic antioxidants to improve the ageing properties of the polypropylene material. And the hindered amine electret (HALS) is used as an electret, and can be used together with polypropylene melt-blown materials, so that the filtering performance of the fiber can be remarkably improved. The existing water electret technology is to add a hindered amine electret agent (HALS) into polypropylene melt-blown material, and then to perform high-speed friction electret through ultrapure water so as to enable the fiber to be deeply electret. Compared with the conventional corona electret technology (called electrode electret for short), the technology has higher filtering efficiency and lower resistance. However, hindered amine type electron-statics undergo redox cycling with hydroperoxides under hot oxygen conditions during polymer processing, one of the intermediates being a stable nitroxyl radical. There is evidence that these free radicals can oxidize phenolic antioxidants to stilbene quinone, leading to reddish yellowing of the material.
The melt-blown material which generates redness and yellowing seriously affects the appearance of the product, the ageing resistance and charge decay resistance of the material are gradually deteriorated, the service life of the product is greatly reduced, and the like, and the defects limit the application in the field of air filtration. Therefore, there is a need to develop a high performance meltblown material that has high efficiency, low resistance, resistance to charge decay, and resistance to redness and yellowing.
Disclosure of Invention
Based on this, the present invention aims to overcome the above-mentioned shortcomings of the prior art and provide a melt-blown polypropylene composite material, and a preparation method and application thereof.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: the melt-blown polypropylene composite material comprises the following components in parts by weight: 80-93 parts of polypropylene melt-blown material, 3-12 parts of aliphatic polyamide, 1-5 parts of zirconium phosphate and 3-5 parts of electret master batch.
The inventor finds that the aliphatic polyamide and zirconium phosphate are introduced into the polypropylene melt-blown material, and the crystallization capability of the material is improved through the action of hydrogen bonds in the aliphatic polyamide, so that more charges are accumulated at the interface of a crystallization area and an amorphous area, and the filtering performance and the strength of the material are improved. On one hand, zirconium phosphate has a layered structure, and can absorb nitroxyl free radicals generated by oxidation-reduction reaction of hindered amine in a system, so that the reddish yellow of the material is effectively reduced. On the other hand, zirconium phosphate has larger specific surface area, is favorable for forming more 'traps' for storing charges, and has less migration and less escape under the action of hydrogen bonds of the charges stored in the 'traps', so that the anti-charge decay performance of the material is remarkably improved.
Preferably, the weight parts of the aliphatic polyamide may be selected from 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, 11 parts, 12 parts; the zirconium phosphate may be selected from 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts, 5 parts.
Preferably, the melt index of the polypropylene melt blown is from 1200 to 1500g/10min, the melt index of the polypropylene melt blown being measured according to astm d1238 using a weight of 2.16kg and at a temperature of 190 ℃.
Preferably, the melt-blown polypropylene composite material comprises the following components in parts by weight: 85-89 parts of polypropylene melt-blown material, 5-8 parts of aliphatic polyamide, 3-4 parts of zirconium phosphate and 3-5 parts of electret master batch.
The inventor finds that when the polypropylene melt-blown material, the aliphatic polyamide and the zirconium phosphate are selected by the weight parts, the prepared melt-blown polypropylene composite material has better effects of resisting charge attenuation and red yellowing and higher strength after forming a melt-blown nonwoven material.
Preferably, in the melt-blown polypropylene composite material, the number of the methylene monomers of the aliphatic polyamide is n, n is an even number and n is not equal to 0.
The aliphatic polyamide disclosed by the invention has the advantages that the molecular chain consists of methylene and amido, and the molecular chain is of a linear structure consisting of-C-N-chains. Is one or more of p-type polyamide or mp-type polyamide. Wherein the p-type polyamide has amide groups distributed along the molecular chain and contains p-1 continuous methylene groups between every two polyamide groups. mp-type polyamides containing m consecutive methylene groups between two imino groups and p-2 methylene groups between two carboxyl groups. The p-type or mp-type polyamide disclosed by the invention has the advantages that the number of carbon atoms contained in monomers is different, the proportion of hydrogen bonds formed among molecular chains and the degree of density of the hydrogen bonds distributed along the molecular chains are different, and the larger the proportion of the hydrogen bonds is, the stronger the crystallization capability of the material is, and the strength is higher. The more interfaces are formed by crystallization, more traps for storing charges can be formed on the interfaces when the fiber electret material is prepared, so that the charge density of the fiber material is enhanced, the electrostatic effect is better, and the material has higher filtering efficiency and anti-charge decay performance. The preferred monomers of the invention are polyamides with an even number of methylene groups, and all amide groups on the molecular chain of the polyamide can form hydrogen bonds at 100%. While all or one of the monomers contains an odd number of methylene groups, only 50% of the amide groups on the polyamide molecular chain form hydrogen bonds.
The inventor finds that when the number of the methylene monomers of the aliphatic polyamide is n, n is even and n is not equal to 0, the prepared melt-blown polypropylene composite material has better effects of resisting charge attenuation and red yellowing and higher strength after forming a melt-blown nonwoven material.
Preferably, the aliphatic polyamide has a number of methylene monomers of 10 to 18. Further preferably, the aliphatic polyamide has a number of methylene monomers of 10 to 16. Most preferably, the aliphatic polyamide is at least one of PA11, PA 612.
The inventor finds that when the number of the methylene monomers of the aliphatic polyamide is 10-16, the prepared melt-blown polypropylene composite material has better effects of resisting charge attenuation and red yellowing after forming a melt-blown nonwoven material.
In addition, the invention provides a preparation method of the melt-blown polypropylene composite material, which comprises the following steps:
(1) Weighing the components according to the proportion;
(2) Mixing the components in the step (1) to obtain a mixture A;
(3) And (3) conveying the mixture A obtained in the step (2) into a screw extruder, and performing extrusion granulation to obtain the melt-blown polypropylene composite material.
Further, the invention provides application of the melt-blown polypropylene composite material in the field of air filtration.
Compared with the prior art, the invention has the beneficial effects that: (1) Introducing aliphatic polyamide and zirconium phosphate into the polypropylene melt-blown material, and improving the crystallization capability of the material through the action of hydrogen bonds in the aliphatic polyamide, so as to improve the electrostatic electret performance of the fiber material; (2) Zirconium phosphate has larger specific surface area, on one hand, the zirconium phosphate is favorable for forming more 'traps' for storing charges, and the charges stored in the 'traps' have less migration and less escape under the action of hydrogen bonds, so that the charge attenuation resistance of the material is obviously improved; (3) Zirconium phosphate can absorb nitroxyl radical generated by oxidation-reduction reaction of hindered amine in the system, so that the reaction of nitroxyl radical and phenolic antioxidant is slowed down, and finally the redness and yellowing of the material are effectively weakened.
Detailed Description
For a better description of the objects, technical solutions and advantages of the present invention, the present invention will be further described with reference to the following specific examples.
In the examples, the experimental methods used are conventional methods unless otherwise specified, and the materials, reagents, etc. used, unless otherwise specified, are commercially available.
The following description of the raw materials used in the examples and comparative examples is provided, but is not limited to these materials:
polypropylene melt-blown material 1: PP-91500NC001, gold technology, melt mass flow rate at 190 ℃/2.16kg 1500g/10min;
polypropylene melt-blown material 2: metocene MF650Y, basel, at 190 ℃/2.16kg, melt mass flow rate 1200g/10min;
electret master batch 1: YBL-EW032 NC001, gold technology; the electret master batch comprises components such as polypropylene melt-blown materials, hindered amine, stearate, antioxidants and the like;
electret master batch 2: RCE20, minerale color master limited;
aliphatic polyamide 1: the phase of the PA11,BMNO P20, akema France, number of methylene monomers 10;
aliphatic polyamide 2: the PA-s 612 have the characteristics of,151L NC010, duPont, USA, contains 6 consecutive methylene groups between two imino groups and 10 methylene groups between two carboxyl groups;
aliphatic polyamide 3: the PA1010 has the advantage that,200NN, akema France, contains 10 consecutive methylene groups between two imino groups and 8 methylene groups between two carboxyl groups;
aliphatic polyamide 4: the phase of the PA6,b3EG6-NC, basoff, methylene MonoThe number of the bodies is 5;
aliphatic polyamide 5: PA12, L20G, swiss EMS, number of methylene monomers 11;
zirconium phosphate 1: north Weir chemical reagent, needle-like zirconium phosphate;
zirconium phosphate 2: shanghai river wetting nano technology, layered zirconium phosphate;
zirconium phosphate 3: jin's major nano technology, cubic zirconium phosphate;
montmorillonite: XFI44, nanjing Xianfeng nanotechnology Co., ltd, purity greater than 98%;
examples and comparative examples
The components and the weight parts of the melt-blown polypropylene composite materials of the embodiment and the comparative example are shown in the table 1 and the table 2, and the preparation method of the melt-blown polypropylene composite materials of the embodiment and the comparative example comprises the following steps:
(1) Weighing the components according to the proportion;
(2) Uniformly mixing the components in the step (1) to obtain a mixture A;
(3) Conveying the mixture A obtained in the step (2) into a double-screw extruder, and extruding and granulating to obtain the melt-blown polypropylene composite material; wherein the twin-screw extrusion temperature is 180-200-210-220-220-220-220-210 ℃ and the die head is 220-230 ℃.
TABLE 1
TABLE 2
Performance testing
The melt-blown polypropylene composite materials prepared in the examples and the comparative examples are prepared into melt-blown nonwoven materials by a conventional method, and the method adopted in the preparation of the melt-blown nonwoven materials in the test of the invention is as follows:
s1: uniformly metering and feeding the melt-blown polypropylene composite material into a single-screw extruder through a metering scale; the temperature of each temperature zone of single screw extrusion granulation is 160-180-220-240-240-240 ℃, the temperature of the screen changer and the metering pump is 230-240 ℃, and the mesh number of the screen changer is 30+500+300+80 mesh; the temperature of the melt pipeline is 245-245-245 ℃;
s2: refining spinning; and after plasticizing and homogenizing, the fiber enters a spinning component. The spinning component consists of a die head and a spinneret plate, the temperature of the die head is set at 260 ℃, and fine adjustment is carried out according to the gram weight of each zone;
s3: collecting the integrated net; spraying the fiber after hot air draft onto a net curtain or a roller metal net to form a fiber net;
s4: high-speed friction electret; rubbing the fiber at high speed by using ultrapure water, and then drying;
s5: cutting and rolling.
1. Testing electrostatic resident polar energy; the filtration efficiency PFE of the meltblown webs of comparable resistance was evaluated by testing the same grammage. The test condition is TSI 8130A, flow rate is 32L/min, aerosol type NaCl,0.3um, test area is 100cm 2 The meltblown grammage was 25gsm. (the default resistance deviation.+ -. 1.0pa is the resistance equivalent and the filtration performance PFE deviation.+ -. 0.2% is the efficiency equivalent.)
2. Aging performance test; the aging treatment of the material was performed in accordance with the following procedure to evaluate the PFE attenuation magnitude and the anti-redness-yellowing property.
(1) Placing for (24+/-1) h under the conditions of (38+/-2.5) DEG C and (85+/-5) percent relative humidity;
(2) Placing in a drying environment at 80+ -3deg.C for 20 days;
(3) Placing (24+ -1) h under (-30+ -3deg.C) environment.
(4) After the sample was left at room temperature for 4 hours, the test was restarted.
3. Testing the red-yellow color change performance: the 4 meltblown layers were overlaid together and tested for LAB values using a color difference meter, comparing A, B values before and after aging to changes in total color difference Δe. (tests have found that when Δa is less than or equal to 0.5 and Δb is less than or equal to 1.5, the overall discoloration is visually acceptable beyond this value, and significant discoloration is considered.) the performance test data are shown in tables 3 and 4.
Table 3 example test items and data
Table 4 comparative test items and data
From examples 1-4 and comparative examples 3-7, it was found that the addition of zirconium phosphate and aliphatic polyamide together produced a synergistic effect with a relatively good fiber residence effect and a higher PFE retention after aging.
As can be seen from examples 1-4 and comparative examples 1-2, as the content of zirconium phosphate and polyamide increases, the performance increases and decreases, which is probably because, when the content of zirconium phosphate and polyamide is too high, PA and zirconium phosphate have stronger intermolecular forces, fiber drafting is more difficult, resulting in coarser fiber diameters under the same process conditions, which results in a slightly poorer filtration effect, and when the resistance is relatively low on data, the anti-reddish-yellow effect is poor, and the agglomeration effect is mainly affected by excessive zirconium phosphate, and in addition, the excessive polyamide changes the characteristics of the system, so that the better electrostatic electret characteristics of polypropylene cannot be exerted. When the dosage of zirconium phosphate and polyamide is too small, the synergistic effect on the electret effect is weak, and when the resistance is relatively high, the PFE is low and the anti-redness and yellowing effect is poor. Examples 2, 6, 7, 8, 9 found that even methylene numbers in the polyamide had higher PFE retention than odd methylene numbers after aging; and the smaller the Δa and Δb values, the lower the degree of redness and yellowing of the material.
Examples 2, 5 and 2, 12 found that zirconium phosphate and aliphatic polyamide, melt blown materials of different melt fingers and different electret masterbatches were synergistic.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention may be modified or substituted equally without departing from the spirit and scope of the technical solution of the present invention.
Claims (7)
1. The melt-blown polypropylene composite material is characterized by comprising the following components in parts by weight: 80-93 parts of polypropylene melt-blown material, 3-12 parts of aliphatic polyamide, 1-5 parts of zirconium phosphate and 3-5 parts of electret master batch.
2. The meltblown polypropylene composite according to claim 1, comprising the following components in parts by weight: 85-89 parts of polypropylene melt-blown material, 5-8 parts of aliphatic polyamide, 3-4 parts of zirconium phosphate and 3-5 parts of electret master batch.
3. The meltblown polypropylene composite according to claim 1 or 2, wherein the melt index of the polypropylene melt-blown material is from 1200 to 1500g/10min, the melt index of the polypropylene melt-blown material being measured according to astm d1238 using a weight of 2.16kg and at a temperature of 190 ℃.
4. The meltblown polypropylene composite according to claim 1, wherein the aliphatic polyamide has a number of methylene monomers n, n being an even number and n+.0.
5. The meltblown polypropylene composite according to claim 4, wherein the aliphatic polyamide has a number of methylene monomers of from 10 to 16; preferably, the aliphatic polyamide is at least one of PA11 and PA 612.
6. A method of preparing a melt blown polypropylene composite material according to any one of claims 1 to 5, comprising the steps of:
(1) Weighing the components according to the proportion;
(2) Mixing the components in the step (1) to obtain a mixture A;
(3) And (3) conveying the mixture A obtained in the step (2) into a screw extruder, and performing extrusion granulation to obtain the melt-blown polypropylene composite material.
7. Use of the melt-blown polypropylene composite according to any one of claims 1 to 5 in the field of air filtration.
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