CN110368745A - A kind of antimicrobial form air filtration microporous barrier composite screen and preparation method thereof - Google Patents
A kind of antimicrobial form air filtration microporous barrier composite screen and preparation method thereof Download PDFInfo
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- CN110368745A CN110368745A CN201910570852.7A CN201910570852A CN110368745A CN 110368745 A CN110368745 A CN 110368745A CN 201910570852 A CN201910570852 A CN 201910570852A CN 110368745 A CN110368745 A CN 110368745A
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- microporous barrier
- air filtration
- added
- barrier composite
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- 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
-
- 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
- B01D46/0027—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions
-
- 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
- B01D46/0027—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions
- B01D46/0028—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions provided with antibacterial or antifungal means
-
- 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
- B01D46/54—Particle separators, e.g. dust precipitators, using ultra-fine filter sheets or diaphragms
- B01D46/543—Particle separators, e.g. dust precipitators, using ultra-fine filter sheets or diaphragms using membranes
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F1/00—General methods for the manufacture of artificial filaments or the like
- D01F1/02—Addition of substances to the spinning solution or to the melt
- D01F1/10—Other agents for modifying properties
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F1/00—General methods for the manufacture of artificial filaments or the like
- D01F1/02—Addition of substances to the spinning solution or to the melt
- D01F1/10—Other agents for modifying properties
- D01F1/103—Agents inhibiting growth of microorganisms
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
- D01F6/88—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polycondensation products as major constituent with other polymers or low-molecular-weight compounds
- D01F6/92—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polycondensation products as major constituent with other polymers or low-molecular-weight compounds of polyesters
Abstract
The present invention relates to technical field of polymer composite materials, and in particular to a kind of antimicrobial form air filtration microporous barrier composite screen and preparation method thereof；The composition of the antimicrobial form air filtration microporous barrier composite screen are as follows: the activeness and quietness complexing agent, 2-3 parts of processing aid, 10-15 parts of anti-formaldehyde formulations, 1-2 parts of antibacterial agent, 20-30 parts of auxiliary additive of PBT, 20-30 part that mass fraction is 100-120 parts.Antimicrobial form air filtration prepared by the present invention is prepared with microporous barrier composite screen using substances such as PBT, activeness and quietness complexing agent, processing aid, anti-formaldehyde formulations, antibacterial agent, auxiliary additives, it can have very outstanding antibacterial effect and the ability except formaldehyde, the advantages that its mechanical property is relatively preferable simultaneously, promotes its long service life.
Description
Technical field
The invention belongs to field of polymer composite material, and in particular to a kind of antimicrobial form air filtration microporous barrier composite filter
Net and preparation method thereof.
Background technique
With the development of industrialization, air pollution has become the huge problem of facing mankind, to the existence and life of the mankind
Bring direct or potentially hazardous, therefore, the purification of air just seems unusual necessity.Current air cleaning is mainly to remove
Based on dirt, sterilized using disinfection by ultraviolet light or with the methods of chemosterilant disinfection.But no matter use physical method or chemistry
Method carries out disinfection, and generates biggish irritation and harmfulness to human body, and bactericidal effect is limited.In addition, room air
In contain a large amount of formaldehyde gas, the serious health for endangering human body promotes the occurrence probability of human leukemia, therefore will
Formaldehyde in room air removes and air cleaning must solve the problems, such as, nowadays except the methods of formaldehyde are also more
Kind multiplicity, but its effect is not fully up to expectations or function is more single, therefore develops a multi-functional air cleaning film and just show
It obtains very important.
Summary of the invention
In order to achieve the purpose that in background technique, a kind of antimicrobial form air filtration microporous barrier composite filter proposed by the present invention
Net and preparation method thereof；
What the present invention realized by the following technical solutions:
A kind of antimicrobial form air filtration microporous barrier composite screen and preparation method thereof, which is characterized in that the antimicrobial form air
The filtering composition of microporous barrier composite screen are as follows: the activeness and quietness of PBT, 20-30 part that mass fraction is 100-120 parts is compound
Agent, 2-3 parts of processing aid, 10-15 parts of anti-formaldehyde formulations, 1-2 parts of antibacterial agent, 20-30 parts of auxiliary additive；
Antimicrobial form air filtration microporous barrier composite screen the preparation method comprises the following steps: being 100-120 parts by mass fraction
PBT, 20-30 parts of activeness and quietness complexing agent, 2-3 parts of processing aid, 10-15 parts of anti-formaldehyde formulations, 1-2 parts of antibacterial
Agent, 20-30 parts of auxiliary additive are added in batch mixer and are mixed, and after mixing, twin-screw granulation are added in material and is squeezed
Granulation extrusion is carried out in machine out, obtains mixture grain, obtained particle is then subjected to heat fusing extrusion, measured, reeled off raw silk from cocoons,
It is cooled down in -10--20 DEG C of cold air, is wound after cooling, obtained silk thread is weaved, obtained weaving
Product are exactly antimicrobial form air filtration microporous barrier composite screen.
Further, the activeness and quietness complexing agent are as follows: by mass fraction be 20-30 parts polymethylacrylic acid fourth rouge,
10-20 parts of polyurethane, the polystyrene of 10-15 parts ABS, 5-10,12-15 parts of glass fibre are added in batch mixer and carry out
After mixing, material is added in twin-screw granulating extruder be granulated squeezing out and is modified, what is obtained is exactly that activeness and quietness is multiple
Mixture.
Further, the processing aid are as follows: by mass fraction be 3-5 parts of zinc stearate, 2-3 parts of sodium sorbate,
2-3 parts of olive oil, 2-4 parts of beeswax are added in reaction kettle, obtain after reaction being carried out under the conditions of 60-70 DEG C 1-2 hours
Substance, the substance are exactly processing aid.
Further, anti-formaldehyde formulations are as follows: by mass fraction be 10-15 parts nano-titanium dioxide, 20-30 parts
Diatom ooze, 20-25 parts of silicon carbide, 2-5 parts of nano cerium manganese ore are added in batch mixer, and the substance obtained after mixing should
Substance is exactly anti-formaldehyde formulations.
Further, the antibacterial agent are as follows: by mass fraction be 5-8 parts of chitin, 3-4 parts of silver nitrate, 4-6 parts
Magnesium carbonate, 12-20 parts of nano-titanium dioxide is added in batch mixer, and the substance obtained after mixing, the substance is exactly antibacterial
Agent.
Further, the auxiliary additive are as follows: by mass fraction be 10-20 parts of carbon black, 20-30 parts of talcum powder,
20-30 parts of activated Calcium carbonate, 6-10 parts of glass microsphere are added in batch mixer, the substance obtained after mixing, the substance
It is exactly auxiliary additive.
Beneficial to benefit
Antimicrobial form air filtration microporous barrier composite screen prepared by the present invention is helped using PBT, activeness and quietness complexing agent, processing
Prepared by the substances such as agent, anti-formaldehyde formulations, antibacterial agent, auxiliary additive, there can be very outstanding antibacterial effect
The advantages that with the ability for removing formaldehyde, while its mechanical property is relatively preferable, promotes its long service life.
Specific embodiment
In order to keep the purpose of the present invention, technical scheme and beneficial effects clearer, below in conjunction with experimental data, to this
The preferred embodiment of invention is described in detail, to facilitate the technical staff to understand.
Embodiment 1
A kind of antimicrobial form air filtration microporous barrier composite screen the preparation method comprises the following steps:
PBT, 25 parts of activeness and quietness complexing agent, 3 parts of processing aid, 12 parts of anti-formaldehyde system by mass fraction for 120 parts
Agent, 2 parts of antibacterial agent, 25 parts of auxiliary additive are added in batch mixer and are mixed, and after mixing, double spiral shells are added in material
Granulation extrusion is carried out in bar granulating extruder, obtains mixture grain, obtained particle is then subjected to heat fusing extrusion, through counting
It measures, reel off raw silk from cocoons, cooled down in -10--20 DEG C of cold air, wound after cooling, obtained silk thread is weaved, is obtained
To textile be exactly antimicrobial form air filtration microporous barrier composite screen.
Further, the activeness and quietness complexing agent are as follows: by mass fraction be 30 parts polymethylacrylic acid fourth rouge, 15 parts
Polyurethane, 10 parts of ABS, 6 polystyrene, 15 parts glass fibre be added batch mixer in carry out after mixing, by object
Material is added in twin-screw granulating extruder be granulated squeezing out and be modified, and what is obtained is exactly activeness and quietness complexing agent.
Further, the processing aid are as follows: by mass fraction be 3 parts of zinc stearate, 3 parts of sodium sorbate, 2 parts
Olive oil, 3 parts of beeswax are added in reaction kettle, the substance obtained after reaction being carried out under the conditions of 60-70 DEG C 1-2 hours, the object
Matter is exactly processing aid.
Further, the anti-formaldehyde formulations are as follows: by mass fraction be 15 parts of nano-titanium dioxide, 25 parts of diatom
Mud, 25 parts of silicon carbide, 4 parts of nano cerium manganese ore are added in batch mixer, the substance obtained after mixing, which is exactly anti-
Formaldehyde formulations.
Further, the antibacterial agent are as follows: by mass fraction be 8 parts of chitin, 3 parts of silver nitrate, 6 parts of carbonic acid
Magnesium, 15 parts of nano-titanium dioxide are added in batch mixer, and the substance obtained after mixing, the substance is exactly antibacterial agent.
Further, the auxiliary additive are as follows: by mass fraction be 20 parts of carbon black, 25 parts of talcum powder, 30 parts
Activated Calcium carbonate, 8 parts of glass microsphere are added in batch mixer, the substance obtained after mixing, which is exactly auxiliary addition
Agent.
Embodiment 2
A kind of antimicrobial form air filtration microporous barrier composite screen the preparation method comprises the following steps:
PBT, 30 parts of activeness and quietness complexing agent, 2 parts of processing aid, 10 parts of anti-formaldehyde system by mass fraction for 110 parts
Agent, 1 part of antibacterial agent, 20 parts of auxiliary additive are added in batch mixer and are mixed, and after mixing, double spiral shells are added in material
Granulation extrusion is carried out in bar granulating extruder, obtains mixture grain, obtained particle is then subjected to heat fusing extrusion, through counting
It measures, reel off raw silk from cocoons, cooled down in -10--20 DEG C of cold air, wound after cooling, obtained silk thread is weaved, is obtained
To textile be exactly antimicrobial form air filtration microporous barrier composite screen.
Further, the activeness and quietness complexing agent are as follows: by mass fraction be 25 parts polymethylacrylic acid fourth rouge, 10 parts
Polyurethane, 12 parts of ABS, 10 polystyrene, 13 parts glass fibre be added batch mixer in carry out after mixing, by object
Material is added in twin-screw granulating extruder be granulated squeezing out and be modified, and what is obtained is exactly activeness and quietness complexing agent.
Further, the processing aid are as follows: by mass fraction be 4 parts of zinc stearate, 3 parts of sodium sorbate, 2 parts
Olive oil, 2 parts of beeswax are added in reaction kettle, the substance obtained after reaction being carried out under the conditions of 60-70 DEG C 1-2 hours, the object
Matter is exactly processing aid.
Further, the anti-formaldehyde formulations are as follows: by mass fraction be 12 parts of nano-titanium dioxide, 30 parts of diatom
Mud, 22 parts of silicon carbide, 5 parts of nano cerium manganese ore are added in batch mixer, the substance obtained after mixing, which is exactly anti-
Formaldehyde formulations.
Further, the antibacterial agent are as follows: by mass fraction be 6 parts of chitin, 4 parts of silver nitrate, 5 parts of carbonic acid
Magnesium, 20 parts of nano-titanium dioxide are added in batch mixer, and the substance obtained after mixing, the substance is exactly antibacterial agent.
Further, the auxiliary additive are as follows: by mass fraction be 15 parts of carbon black, 30 parts of talcum powder, 25 parts
Activated Calcium carbonate, 10 parts of glass microsphere are added in batch mixer, the substance obtained after mixing, which is exactly auxiliary addition
Agent.
Embodiment 3
A kind of antimicrobial form air filtration microporous barrier composite screen the preparation method comprises the following steps:
PBT, 20 parts of activeness and quietness complexing agent, 2 parts of processing aid, 10 parts of anti-formaldehyde system by mass fraction for 100 parts
Agent, 1 part of antibacterial agent, 20 parts of auxiliary additive are added in batch mixer and are mixed, and after mixing, double spiral shells are added in material
Granulation extrusion is carried out in bar granulating extruder, obtains mixture grain, obtained particle is then subjected to heat fusing extrusion, through counting
It measures, reel off raw silk from cocoons, cooled down in -10--20 DEG C of cold air, wound after cooling, obtained silk thread is weaved, is obtained
To textile be exactly antimicrobial form air filtration microporous barrier composite screen.
Further, the activeness and quietness complexing agent are as follows: by mass fraction be 20 parts polymethylacrylic acid fourth rouge, 10 parts
Polyurethane, 10 parts of ABS, 5 polystyrene, 12 parts glass fibre be added batch mixer in carry out after mixing, by object
Material is added in twin-screw granulating extruder be granulated squeezing out and be modified, and what is obtained is exactly activeness and quietness complexing agent.
Further, the processing aid are as follows: by mass fraction be 3 parts of zinc stearate, 2 parts of sodium sorbate, 2 parts
Olive oil, 2 parts of beeswax are added in reaction kettle, the substance obtained after reaction being carried out under the conditions of 60-70 DEG C 1-2 hours, the object
Matter is exactly processing aid.
Further, the anti-formaldehyde formulations are as follows: by mass fraction be 10 parts of nano-titanium dioxide, 20 parts of diatom
Mud, 20 parts of silicon carbide, 2 parts of nano cerium manganese ore are added in batch mixer, the substance obtained after mixing, which is exactly anti-
Formaldehyde formulations.
Further, the antibacterial agent are as follows: by mass fraction be 5 parts of chitin, 3 parts of silver nitrate, 4 parts of carbonic acid
Magnesium, 12 parts of nano-titanium dioxide are added in batch mixer, and the substance obtained after mixing, the substance is exactly antibacterial agent.
Further, the auxiliary additive are as follows: by mass fraction be 10 parts of carbon black, 20 parts of talcum powder, 20 parts
Activated Calcium carbonate, 6 parts of glass microsphere are added in batch mixer, the substance obtained after mixing, which is exactly auxiliary addition
Agent.
Embodiment 4
A kind of antimicrobial form air filtration microporous barrier composite screen the preparation method comprises the following steps:
PBT, 30 parts of activeness and quietness complexing agent, 3 parts of processing aid, 15 parts of anti-formaldehyde system by mass fraction for 120 parts
Agent, 2 parts of antibacterial agent, 30 parts of auxiliary additive are added in batch mixer and are mixed, and after mixing, double spiral shells are added in material
Granulation extrusion is carried out in bar granulating extruder, obtains mixture grain, obtained particle is then subjected to heat fusing extrusion, through counting
It measures, reel off raw silk from cocoons, cooled down in -10--20 DEG C of cold air, wound after cooling, obtained silk thread is weaved, is obtained
To textile be exactly antimicrobial form air filtration microporous barrier composite screen.
Further, the activeness and quietness complexing agent are as follows: by mass fraction be 30 parts polymethylacrylic acid fourth rouge, 20 parts
Polyurethane, 15 parts of ABS, 10 polystyrene, 15 parts glass fibre be added batch mixer in carry out after mixing, by object
Material is added in twin-screw granulating extruder be granulated squeezing out and be modified, and what is obtained is exactly activeness and quietness complexing agent.
Further, the processing aid are as follows: by mass fraction be 5 parts of zinc stearate, 3 parts of sodium sorbate, 3 parts
Olive oil, 4 parts of beeswax are added in reaction kettle, the substance obtained after reaction being carried out under the conditions of 60-70 DEG C 1-2 hours, the object
Matter is exactly processing aid.
Further, the anti-formaldehyde formulations are as follows: by mass fraction be 15 parts of nano-titanium dioxide, 30 parts of diatom
Mud, 25 parts of silicon carbide, 5 parts of nano cerium manganese ore are added in batch mixer, the substance obtained after mixing, which is exactly anti-
Formaldehyde formulations.
Further, the antibacterial agent are as follows: by mass fraction be 8 parts of chitin, 4 parts of silver nitrate, 6 parts of carbonic acid
Magnesium, 20 parts of nano-titanium dioxide are added in batch mixer, and the substance obtained after mixing, the substance is exactly antibacterial agent.
Further, the auxiliary additive are as follows: by mass fraction be 20 parts of carbon black, 30 parts of talcum powder, 30 parts
Activated Calcium carbonate, 10 parts of glass microsphere are added in batch mixer, the substance obtained after mixing, which is exactly auxiliary addition
Agent.
Experimental analysis:
1, properties of product are tested
The antimicrobial form air filtration of the preparation of embodiment 1-4 is subjected to properties test with microporous barrier composite screen, is tested,
As a result as shown in the table:
| Project | Examination criteria | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 |
| Tensile strength (MPa) | GB/T1040.1 | 135 | 136 | 135 | 134 |
| Elongation at break (%) | GB/T1040.1 | 158.7 | 155.6 | 157.4 | 53.6 |
| Antibiotic rate (%) | 76 | 77 | 78 | 76 | |
| Formaldehyde filter efficiency (%) | 94 | 95 | 94 | 93 |
It is found that antimicrobial form air filtration prepared by the present invention is with microporous barrier composite screen, it receives elongation at break to above-mentioned test result
It is relatively high, illustrate its with good elastic property, meanwhile, remove formaldehyde better performances, can effectively remove in air
Formaldehyde.
Finally, it is stated that preferred embodiment above is only used to illustrate the technical scheme of the present invention rather than limits, although logical
It crosses above preferred embodiment the present invention is described in detail, however, those skilled in the art should understand that, can be
Various changes are made to it in form and in details, without departing from defined by claims of the present invention.
Claims (6)
1. a kind of antimicrobial form air filtration microporous barrier composite screen and preparation method thereof, which is characterized in that the antimicrobial form is empty
The gas filtering composition of microporous barrier composite screen are as follows: the activeness and quietness of PBT, 20-30 part that mass fraction is 100-120 parts is compound
Agent, 2-3 parts of processing aid, 10-15 parts of anti-formaldehyde formulations, 1-2 parts of antibacterial agent, 20-30 parts of auxiliary additive；
Antimicrobial form air filtration microporous barrier composite screen the preparation method comprises the following steps: being 100-120 parts by mass fraction
PBT, 20-30 parts of activeness and quietness complexing agent, 2-3 parts of processing aid, 10-15 parts of anti-formaldehyde formulations, 1-2 parts of antibacterial
Agent, 20-30 parts of auxiliary additive are added in batch mixer and are mixed, and after mixing, twin-screw granulation are added in material and is squeezed
Granulation extrusion is carried out in machine out, obtains mixture grain, obtained particle is then subjected to heat fusing extrusion, measured, reeled off raw silk from cocoons,
It is cooled down in -10--20 DEG C of cold air, is wound after cooling, obtained silk thread is weaved, obtained weaving
Product are exactly antimicrobial form air filtration microporous barrier composite screen.
2. a kind of antimicrobial form air filtration microporous barrier composite screen and preparation method thereof according to claim 1, special
Sign is, the activeness and quietness complexing agent are as follows: by mass fraction be 20-30 part polymethylacrylic acid fourth rouge, 10-20 parts gather
The polystyrene of ammoniacum, 10-15 parts ABS, 5-10,12-15 parts of glass fibre are added in batch mixer and carry out after mixing,
Material is added in twin-screw granulating extruder be granulated squeezing out and is modified, what is obtained is exactly activeness and quietness complexing agent.
3. a kind of antimicrobial form air filtration microporous barrier composite screen and preparation method thereof according to claim 1, special
Sign is, the processing aid are as follows: by mass fraction is 3-5 parts of zinc stearate, 2-3 parts of sodium sorbate, 2-3 parts of olive
Oil, 2-4 parts of beeswax are added in reaction kettle, the substance obtained after reaction being carried out under the conditions of 60-70 DEG C 1-2 hours, the substance
It is exactly processing aid.
4. a kind of antimicrobial form air filtration microporous barrier composite screen and preparation method thereof according to claim 1, special
Sign is, the anti-formaldehyde formulations are as follows: by mass fraction is 10-15 parts of nano-titanium dioxide, 20-30 parts of diatom ooze, 20-
25 parts of silicon carbide, 2-5 parts of nano cerium manganese ore are added in batch mixer, the substance obtained after mixing, which is exactly anti-
Formaldehyde formulations.
5. a kind of antimicrobial form air filtration microporous barrier composite screen and preparation method thereof according to claim 1, special
Sign is, the antibacterial agent are as follows: by mass fraction is 5-8 parts of chitin, 3-4 parts of silver nitrate, 4-6 parts of magnesium carbonate, 12-
20 parts of nano-titanium dioxide is added in batch mixer, and the substance obtained after mixing, the substance is exactly antibacterial agent.
6. a kind of antimicrobial form air filtration microporous barrier composite screen and preparation method thereof according to claim 1, special
Sign is, the auxiliary additive are as follows: by mass fraction is 10-20 parts of carbon black, 20-30 parts of talcum powder, 20-30 parts of work
Property calcium carbonate, 6-10 parts glass microsphere be added batch mixer in, the substance obtained after mixing, the substance be exactly auxiliary add
Agent.
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| CN201910570852.7A CN110368745A (en) | 2019-06-28 | 2019-06-28 | A kind of antimicrobial form air filtration microporous barrier composite screen and preparation method thereof |
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| CN201910570852.7A CN110368745A (en) | 2019-06-28 | 2019-06-28 | A kind of antimicrobial form air filtration microporous barrier composite screen and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113652067A (en) * | 2021-09-27 | 2021-11-16 | 广东巨圣新材料科技有限公司 | Method for preparing carbon fiber polylactic acid composite material |
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