CN104893449B - Blended PTFE composition and paint for porous filter base material - Google Patents
Blended PTFE composition and paint for porous filter base material Download PDFInfo
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- CN104893449B CN104893449B CN201510278466.2A CN201510278466A CN104893449B CN 104893449 B CN104893449 B CN 104893449B CN 201510278466 A CN201510278466 A CN 201510278466A CN 104893449 B CN104893449 B CN 104893449B
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Abstract
The invention relates to a PTFE composition. The PTFE composition comprises PTFE, tyrene acrylic ester copolymer and polyethylene wax. The PTFE composition also comprises sulfonated polyimide modified graphene oxide. The invention also relates to paint containing the PTFE composition and capable of being applied to a porous filter base material as well as a method for smearing the porous filter base material by utilizing the PTFE composition.
Description
Technical field
The present invention relates to PTFE（Politef）Compositionss, more particularly to improving the PTFE composition of characteristic, example
As applied in the coating of porous filtering base material.More particularly it relates to improve the dust collection capacity of porous filtering base material with
And the PTFE composition and coating therefrom of filtering accuracy.
Background technology
Porous filtering base material, such as porous filter plate, be widely used in purification of air, water process, biochemistry detection, little point
The field such as son separation and medicine proposition, is current study hotspot.Porous filtering base material is generally divided into porous metals and filters base
Three kinds of material, ceramic foam filter base material and porous polymer filtering substrate, wherein, porous polymer filtering substrate is relatively low because of which
Cost and preferable mechanical performance, use range is more and more wider.In prior art, the general base of porous polymer filtering substrate
In the higher polymer of intensity, such as ultra-high molecular weight polyethylene and polysulfones etc., its pore-size distribution is wider（Generally in 3～15 μ
Between m）, filtering accuracy is also high.For this purpose, coating can be applied to obtain coating on above-mentioned porous polymer filtering substrate, make
Its uniform pore diameter simultaneously improves filtering accuracy, but also very high to the performance requirement of the coating, and which is needed with excellent steady
Qualitative, good dust removing effects and the bonding force very strong with base material.
Hence it is highly desirable to pass through the improvement of formula and production technology, the coating of excellent combination property is obtained, to obtain
The very porous filtering base material of high filtering precision and filter efficiency.
The content of the invention
In order to solve the above problems, one aspect of the present invention provides a kind of PTFE composition, and which includes：
The PTFE of 100 weight portions；
The styrene-acrylic copolymer of 2～20 weight portions；And
The Tissuemat E of 1～10 weight portion.
In one embodiment, in the PTFE composition, the mean diameter of the PTFE is less than 5 μm.
In one embodiment, the PTFE composition also sulfonated polyimide comprising 1～5 weight portion is modified oxidized
Graphene.
Another aspect of the present invention provides a kind of coating for being applied to porous filtering base material, and the coating is comprising described
PTFE composition.
The yet other aspects of the present invention provide a kind of method of coating porous filtering base material, comprise the steps of：
Porous filtering base material is provided；
The PTFE composition is coated on the porous filtering base material；With
Solidify the compositionss to form coating.
The above-mentioned of the application and other features, aspect and advantage is more readily understood with reference to described further below.
Specific embodiment
The participation in the election detailed description for being preferable to carry out method of the invention below and including embodiment can be more easily understood it is public
Open content.A large amount of terms can be referred in description below and claims, these terms are defined as following meanings.
Singulative includes that plural number discusses object, unless the context clearly dictates otherwise.
" optional " or " arbitrary " refers to that the item for describing thereafter or event may or may not occur, and the description
The situation that the situation and event occurred including event does not occur.
Approximate term in specification and claims is used for modifying quantity, represents that the present invention is not limited to this concrete
Quantity, also includes the acceptable part without causing the amendment of the change of related basic function being close to the quantity.Phase
Answer, with " about ", a numerical value of the modification such as " about ", mean and the invention is not restricted to the exact numerical.In some examples, approximately
Term likely corresponds to the precision of the instrument of measured value.In present specification and claims, scope is limited can be with
Combination and/or exchange, these scopes include all subranges contained therebetween if not stated otherwise.
In order to solve the above problems, one aspect of the present invention provides a kind of PTFE composition, and which includes：
The PTFE of 100 weight portions；
The styrene-acrylic copolymer of 2～20 weight portions；And
The Tissuemat E of 1～10 weight portion；
Preferably, the PTFE composition, which includes：
The PTFE of 100 weight portions；
The styrene-acrylic copolymer of 4～10 weight portions；And
The Tissuemat E of 2～5 weight portions.
Also known as politef, it is by Natural Fluorite to term " PTFE " in the application（Calcium fluoride）Based on Ore,
Jing after a series of chemical processes make tetrafluoroethylene monomer, the perfluorinate straight chain polymer material of synthetic polymeric.It is common to mould
Material is compared, and it has high relative molecular weight and higher degree of crystallinity, and generally, degree of crystallinity is 45%-75%, special
Up to more than 97%.The heat stability of PTFE is good, dielectric properties are excellent, chemical resistance is good, and has low-friction coefficient（Gu
It is minimum in body）And strong-hydrophobicity, it is referred to as " King ", therefore is highly suitable for coating porous filtering base material.For this Shen
There is no particular limitation for PTFE please, can be commercially available or synthesis.
Term " styrene-acrylic copolymer " in the application is obtained by styrene and acrylate monomer copolymerization
, including high component and the polymer of low-molecular-weight.For the PTFE of the application, there is no particular limitation, can be commercially available
Or experiment synthesis.For example may be from business-like styrene-acrylic emulsion or obtained by emulsion polymerization experiment.
Term " Tissuemat E " in the application also known as macromolecule wax abbreviation Tissuemat E, because of its excellent tolerance to cold, resistance to
Hot, chemical resistance and wearability and be widely used.For the Tissuemat E of the application, there is no particular limitation, can be with
For commercially available product.
In one embodiment, the mean diameter of the PTFE is less than 5 μm.Can be using the little PTFE of mean diameter
The precision of filtering substrate is improved to a certain extent.
In one embodiment, the PTFE is included：
At least one mean diameter is 4～5 μm of PTFE, and accounts for 1 of the total solid weight of PTFE in the compositionss
Weight % is to 98 weight %；
At least one mean diameter is 2～3 μm of PTFE, and accounts for 1 of the total solid weight of PTFE in the compositionss
Weight % is to 98 weight %；With
At least one mean diameter is 0.5～1 μm of PTFE, and accounts for the total solid weight of all PTFE in the compositionss
1 weight % of amount is to 98 weight %；
Preferably, the PTFE is included：
At least one mean diameter is 4～5 μm of high molecular PTFE, and its number-average molecular weight (Mn) is at least 700,000
And
And 30 weight % of the total solid weight of PTFE in the compositionss are accounted for 70 weight %；
At least one mean diameter is 2～3 μm of high molecular PTFE, and its number-average molecular weight (Mn) is at least 500,000
And
And 20 weight % of the total solid weight of PTFE in the compositionss are accounted for 40 weight %；With
At least one mean diameter is 0.5～1 μm of low-molecular-weight PTFE, its first melt temperature (Tm) for 333 DEG C or
It is lower
And 10 weight % of the total solid weight of all PTFE in the compositionss are accounted for 50 weight %.
It has been found that the blending by three kinds of different mean diameters and the PTFE of molecular weight coordinates, can be further
Improve the precision of filtering substrate in ground.
In one embodiment, the PTFE composition also sulfonated polyimide comprising 1～5 weight portion is modified oxidized
Graphene.The sulfonated polyimide modified graphene oxide refers to the method by chemical graft, by the sulphur of certain molecular weight
Change polyimide grafted in graphene oxide.The particle diameter of the sulfonated polyimide modified graphene oxide be preferably 0.05～
0.6 μm, more preferably 0.2～0.4 μm.It is due to having less size and strong with the active force of binding agent, therefore sulfonation is poly-
The addition of imide-modified graphene oxide can further improve the precision for filtering sheet material.
Preferably, the sulfonated polyimide modified graphene oxide is by comprising amino-terminated sulfonated polyimide pre-polymerization
The raw material of thing, epoxy silane coupling agent and graphene oxide is prepared, and its concrete preparation method is preferably：
（1）The preparation of epoxy silane modification sulphonation polyimide preformed polymer
1 mole of sulfonated diamine, metacresol and triethylamine are added in the there-necked flask being completely dried, is protected in noble gases
Shield is lower to be stirred, and after sulfonated diamine is completely dissolved, adds 0.8～0.98 mole of dianhydride and 2.0～4.0 moles of catalyst,
After about 30min is stirred at room temperature, 75～85 DEG C are heated to about, react about 3.5～4.5h, then at about 175～185 DEG C, instead
Should about 3.5～4.5h；After reaction terminates, room temperature is down to, solution is poured in methanol, is had Precipitation；Use methanol cyclic washing
After filtering after removing solvent, about 50 DEG C in the vacuum drying oven at dry about 22～24h, obtain final product amino-terminated sulfonated polyimide
Prepolymer；
10 parts of amino-terminated sulfonated polyimide prepolymer, epoxy type silane idol are added in the there-necked flask being completely dried
1～30 part of agent of connection and appropriate good solvent, under inert gas shielding after stir about 30min, are heated to about 75～85 DEG C of reactions
After about 2h, room temperature is down to, solution is poured in methanol, has Precipitation；Removed with methanol cyclic washing after filtering after solvent, in
About 22～24h is dried at about 50 DEG C in vacuum drying oven, the modified sulfonated polyimide prepolymer of epoxy silane is obtained final product；
（2）The preparation of sulfonated polyimide modified graphene oxide
By step（1）10 parts modified of sulfonated polyimide prepolymer of obtained epoxy silane, and graphene oxide 10
During～50 parts add deionized water, plus appropriate bases adjust PH to 8～10, after ultrasound about 30min, stir anti-at about 65～75 DEG C
Appropriate hydrochloric acid should be added after about 80～100min, adjust PH to 1～2, after proton exchange about 24h, then neutralize the solution, take out
After filtering and removing solvent, sulfonated polyimide modified graphene oxide is obtained final product；
Number used by above material is weight portion.
Be preferably carried out in mode in one kind, the sulfonated diamine be selected from 4,4'- diamino-diphenyl -2,2'- disulfonic acid,
4,4'- diaminourea -3,3'- dimethyl diphenyl methane -2,2'- disulfonic acid, 4,4'- diaminourea -2,2', 3,3'- dimethyl hexichol
Methane -2,2'- disulfonic acid, 4,4'- diaminourea -2,2'- dimethyl diphenyl -2,2'- disulfonic acid, 4,4'- diaminourea -3,3'- two
Methyl biphenyl -2,2'- disulfonic acid, 4,4'- benzidine -3,3'- disulfonic acid, 2,6'- diaminostilbenes, 3,5- trimethylbenzene sulphurs
Acid, 3,5- diamino benzene sulfonic acids, 4,4'- diaminodiphenyl ether -2,2'- disulfonic acid, two sulphurs of 3,4'- diaminodiphenyl ethers -2,3'-
Sour, 4,4'- diaminostilbenes ' ', bis- phenoxy group benzene -5''- sulfonic acid of 3'', 3,3'- diaminostilbenes ' ', bis- phenoxy group benzene -5''- of 3''-
Sulfonic acid, 9,9'- double (4- aminophenyls) fluorenes -2,7'- disulfonic acid, 4,4'- diaminourea -4'', bis- aminophenoxy biphenyl -3'' of 4'''-,
3'''- disulfonic acid, 4,4'- diaminourea -4'', bis- phenoxy groups of 4'''--diphenyl isopropyl alkane -5'', 5'''- disulfonic acid or 4,4'-
Diaminostilbene ' ', bis- phenoxy groups of 4''--benzene -2''- sulfonic acid, 2,2 '-bis- (4- sulfonic benzo epoxides) benzidines, 3,3 '-it is bis-
In (4- sulfonic benzo epoxides) benzidine any one；Preferably, the sulfonated diamine is side chain type, and double selected from 9,9'-
(4- aminophenyls) fluorenes -2,7'- disulfonic acid, 2,2 '-bis- (4- sulfonic benzo epoxides) benzidines, 3,3 '-bis- (4- sulfonic benzos
Epoxide) in benzidine any one；It is highly preferred that the sulfonated diamine is 3,3 '-bis- (4- sulfonic benzo epoxides) biphenyl two
Amine.
Be preferably carried out in mode in one kind, the dianhydride be Isosorbide-5-Nitrae, 5,8- naphthalenetetracarbacidic acidic dianhydrides.
It is preferably carried out in mode in one kind, for netted, the use of netted graphene oxide can be with for the graphene oxide
The obstructing capacity to dust is further improved, therefore the Advantageous Effects of the present invention can be provided.
It is preferably carried out in mode in one kind, the ratio of carbon and the element outside hydrogen in the netted graphene oxide is
15at%～40at%；Preferably, the ratio of the carbon and the element outside hydrogen in the netted graphene oxide be 17at%～
30at%；It is highly preferred that the ratio of the carbon and the element outside hydrogen in the netted graphene oxide is 18at%～25at%.
Another aspect of the present invention provides a kind of coating for being applied to porous filtering base material, and the coating is comprising described
PTFE composition.
The yet other aspects of the present invention provide a kind of method of coating porous filtering base material, comprise the steps of：
Porous filtering base material is provided；
Described PTFE composition is coated on the porous filtering base material；With
Solidify the compositionss to form coating.
Preferably, in the method for the coating porous filtering base material, solidification is carried out under vacuum.
It has been found that under vacuum, be conducive to improving the state of cure of coating, increase cohesive force and be conducive to carrying
High filtering precision, therefore the Advantageous Effects of the present invention can be provided.
The present invention is specifically described below by embodiment.Be necessary it is pointed out here that, following examples are only used
In the invention will be further described, it is impossible to be interpreted as limiting the scope of the invention, professional and technical personnel in the field
According to some nonessential modifications and adaptations that the content of the invention described above is made, protection scope of the present invention is still fallen within.
In addition, if do not have other to illustrate, it is raw materials used be all it is commercially available, and number used by following material is weight
Part.
A1：PTFE（Number-average molecular weight is 800,000, and mean diameter is 8 μm）
A2：PTFE（Number-average molecular weight is 850,000, and mean diameter is 5 μm）
A3：PTFE（Number-average molecular weight is 580,000, and mean diameter is 3 μm）
A4：PTFE（First melt temperature is 333 DEG C, and mean diameter is 1 μm）
A5：PTFE（First melt temperature is 330 DEG C, and mean diameter is 0.5 μm）
B1：Styrene-acrylic emulsion（By the gross weight meter of styrene-acrylic emulsion, the content of styrene-acrylic copolymer is 40 weight %）
C1:Tissuemat E
D1：Sulfonated polyimide modified graphene oxide, its preparation method is：
（1）The preparation of epoxy silane modification sulphonation polyimide preformed polymer
In the there-necked flask being completely dried add 1 mole 4,4'- diamino-diphenyl -2,2'- disulfonic acid, 20 moles
Metacresol and 2.2 moles of triethylamine, stir under inert gas shielding, after sulfonated diamine is completely dissolved, add 0.8 to rub
Your Isosorbide-5-Nitrae, the benzoic acid of 5,8- naphthalenetetracarbacidic acidic dianhydrides and 4.0 moles, after about 30min is stirred at room temperature, is heated to about 85 DEG C,
Reaction about 4.5h, then at about 185 DEG C, react about 4.5h；After reaction terminates, room temperature is down to, solution is poured in methanol, have heavy
Precipitation goes out；Removed with methanol cyclic washing after filtering after solvent, about 50 DEG C in the vacuum drying oven at dry about 22h, obtain final product amino
The sulfonated polyimide prepolymer of end-blocking；
10 parts of above-mentioned amino-terminated sulfonated polyimide prepolymer, epoxy type silicon are added in the there-necked flask being completely dried
100 parts of 15 parts of alkane coupling agent KH-560 and dimethyl sulfoxide, under inert gas shielding after stir about 30min, are heated to
After about 80 DEG C of reaction about 2h, room temperature is down to, solution is poured in methanol, is had Precipitation；Solvent is removed with methanol cyclic washing
After filtering afterwards, about 50 DEG C in the vacuum drying oven at dry about 24h, obtain final product the modified sulfonated polyimide prepolymer of epoxy silane；
（2）The preparation of sulfonated polyimide modified graphene oxide
10 parts of the sulfonated polyimide prepolymer that epoxy silane obtained in step (1) is modified, and netted graphite oxide
Alkene（The ratio of the element outside carbon and hydrogen is 15at%）During 30 parts add deionized water, plus appropriate bases adjust PH to 9, and ultrasound is about
After 30min, after stirring reaction about 100min at about 75 DEG C, appropriate hydrochloric acid is added, adjust PH to 2, proton exchange about 24h
Afterwards, then neutralize the solution, sucking filtration after removing solvent obtains final product sulfonated polyimide modified graphene oxide；
Number used by above material is weight portion.
D2：Sulfonated polyimide modified graphene oxide, its preparation method is：
（1）The preparation of epoxy silane modification sulphonation polyimide preformed polymer
Add in the there-necked flask being completely dried 1 mole double (4- aminophenyls) fluorenes -2,7'- disulfonic acid of 9,9'-, 20
Mole metacresol and 2.2 moles of triethylamine, stir under inert gas shielding, after sulfonated diamine is completely dissolved, add
0.9 mole of Isosorbide-5-Nitrae, the benzoic acid of 5,8- naphthalenetetracarbacidic acidic dianhydrides and 4.0 moles, after about 30min is stirred at room temperature, is heated to about
85 DEG C, about 4.5h is reacted, then at about 185 DEG C, react about 4.5h；After reaction terminates, room temperature is down to, solution is poured into methanol
In, there is Precipitation；Removed with methanol cyclic washing after filtering after solvent, about 50 DEG C in the vacuum drying oven at dry about 22h, i.e.,
Obtain amino-terminated sulfonated polyimide prepolymer；
10 parts of above-mentioned amino-terminated sulfonated polyimide prepolymer, epoxy type silicon are added in the there-necked flask being completely dried
100 parts of 15 parts of alkane coupling agent KH-560 and dimethyl sulfoxide, under inert gas shielding after stir about 30min, are heated to
After about 80 DEG C of reaction about 2h, room temperature is down to, solution is poured in methanol, is had Precipitation；Solvent is removed with methanol cyclic washing
After filtering afterwards, about 50 DEG C in the vacuum drying oven at dry about 24h, obtain final product the modified sulfonated polyimide prepolymer of epoxy silane；
（2）The preparation of sulfonated polyimide modified graphene oxide
10 parts of the sulfonated polyimide prepolymer that epoxy silane obtained in step (1) is modified, and netted graphite oxide
Alkene（The ratio of the element outside carbon and hydrogen is 17at%）During 30 parts add deionized water, plus appropriate bases adjust PH to 9, and ultrasound is about
After 30min, after stirring reaction about 100min at about 75 DEG C, appropriate hydrochloric acid is added, adjust PH to 2, proton exchange about 24h
Afterwards, then neutralize the solution, sucking filtration after removing solvent obtains final product sulfonated polyimide modified graphene oxide；
Number used by above material is weight portion.
D3：Sulfonated polyimide modified graphene oxide, its preparation method is：
（1）The preparation of epoxy silane modification sulphonation polyimide preformed polymer
Add in the there-necked flask being completely dried 1 mole double (4- aminophenyls) fluorenes -2,7'- disulfonic acid of 9,9'-, 20
Mole metacresol and 2.2 moles of triethylamine, stir under inert gas shielding, after sulfonated diamine is completely dissolved, add
0.98 mole of Isosorbide-5-Nitrae, the benzoic acid of 5,8- naphthalenetetracarbacidic acidic dianhydrides and 4.0 moles, after about 30min is stirred at room temperature, is heated to
About 85 DEG C, about 4.5h is reacted, then at about 185 DEG C, react about 4.5h；After reaction terminates, room temperature is down to, solution is poured into methanol
In, there is Precipitation；Removed with methanol cyclic washing after filtering after solvent, about 50 DEG C in the vacuum drying oven at dry about 22h, i.e.,
Obtain amino-terminated sulfonated polyimide prepolymer；
10 parts of above-mentioned amino-terminated sulfonated polyimide prepolymer, epoxy type silicon are added in the there-necked flask being completely dried
100 parts of 15 parts of alkane coupling agent KH-560 and dimethyl sulfoxide, under inert gas shielding after stir about 30min, are heated to
After about 80 DEG C of reaction about 2h, room temperature is down to, solution is poured in methanol, is had Precipitation；Solvent is removed with methanol cyclic washing
After filtering afterwards, about 50 DEG C in the vacuum drying oven at dry about 24h, obtain final product the modified sulfonated polyimide prepolymer of epoxy silane；
（2）The preparation of sulfonated polyimide modified graphene oxide
10 parts of the sulfonated polyimide prepolymer that epoxy silane obtained in step (1) is modified, and netted graphite oxide
Alkene（The ratio of the element outside carbon and hydrogen is 30at%）During 30 parts add deionized water, plus appropriate bases adjust PH to 9, and ultrasound is about
After 30min, after stirring reaction about 100min at about 75 DEG C, appropriate hydrochloric acid is added, adjust PH to 2, proton exchange about 24h
Afterwards, then neutralize the solution, sucking filtration after removing solvent obtains final product sulfonated polyimide modified graphene oxide；
Number used by above material is weight portion.
D4：Sulfonated polyimide modified graphene oxide, its preparation method is：
（1）The preparation of epoxy silane modification sulphonation polyimide preformed polymer
In the there-necked flask being completely dried, add 1 mole of 3,3 '-bis- (4- sulfonic benzo epoxides) benzidines, 20 to rub
Your metacresol and 2.2 moles of triethylamine, stir under inert gas shielding, after sulfonated diamine is completely dissolved, add 0.9
Mole Isosorbide-5-Nitrae, the benzoic acid of 5,8- naphthalenetetracarbacidic acidic dianhydrides and 4.0 moles, after about 30min is stirred at room temperature, is heated to about 85
DEG C, about 4.5h is reacted, then at about 185 DEG C, reacts about 4.5h；After reaction terminates, room temperature is down to, solution is poured in methanol,
There is Precipitation；Removed with methanol cyclic washing after filtering after solvent, about 50 DEG C in the vacuum drying oven at dry about 22h, obtain final product
Amino-terminated sulfonated polyimide prepolymer；
10 parts of above-mentioned amino-terminated sulfonated polyimide prepolymer, epoxy type silicon are added in the there-necked flask being completely dried
100 parts of 15 parts of alkane coupling agent KH-560 and dimethyl sulfoxide, under inert gas shielding after stir about 30min, are heated to
After about 80 DEG C of reaction about 2h, room temperature is down to, solution is poured in methanol, is had Precipitation；Solvent is removed with methanol cyclic washing
After filtering afterwards, about 50 DEG C in the vacuum drying oven at dry about 24h, obtain final product the modified sulfonated polyimide prepolymer of epoxy silane；
（2）The preparation of sulfonated polyimide modified graphene oxide
10 parts of the sulfonated polyimide prepolymer that epoxy silane obtained in step (1) is modified, and netted graphite oxide
Alkene（The ratio of the element outside carbon and hydrogen is 20at%）During 30 parts add deionized water, plus appropriate bases adjust PH to 9, and ultrasound is about
After 30min, after stirring reaction about 100min at about 75 DEG C, appropriate hydrochloric acid is added, adjust PH to 2, proton exchange about 24h
Afterwards, then neutralize the solution, sucking filtration after removing solvent obtains final product sulfonated polyimide modified graphene oxide；
Number used by above material is weight portion.
E1：Graphene oxide（The ratio of the element outside carbon and hydrogen is 20at%）
Embodiment 1
(1) C1 for taking the A1, the B1 of 5 weight portions and 1 weight portion of 100 weight portions is positioned in dispersing apparatus, is started and is stirred
Mix, mixing speed arranges 800r/min, is warming up to about 40 DEG C of stir about 4h, discharge, obtain porous filtering base material coating.
(2) ultra-high molecular weight polyethylene porous filtering base material is provided, and described in coating on the porous filtering base material
PTFE composition, then solidifies the compositionss to form coating.
Embodiment 2
(1) C1 for taking the A2, the B1 of 50 weight portions and 10 weight portions of 100 weight portions is positioned in dispersing apparatus, is started
Stirring, mixing speed arrange 800r/min, are warming up to about 40 DEG C of stir about 4h, discharge, obtain porous filtering base material coating.
(2) ultra-high molecular weight polyethylene porous filtering base material is provided, and described in coating on the porous filtering base material
PTFE composition, then solidifies the compositionss to form coating.
Embodiment 3
(1) A3, the A4 of 20 weight portions, the A5 of 10 weight portions, the B1 of 25 weight portions and 8 weight portions of 70 weight portions are taken
C1 be positioned in dispersing apparatus, start stirring, mixing speed arranges 800r/min, is warming up to about 40 DEG C of stir about 4h, discharges,
Obtain porous filtering base material coating.
(2) ultra-high molecular weight polyethylene porous filtering base material is provided, and described in coating on the porous filtering base material
PTFE composition, then solidifies the compositionss to form coating.
Embodiment 4
(1) A3 of 60 weight portions, the A4 of 30 weight portions, the A5 of 10 weight portions, the B1 of 25 weight portions, the C1 of 8 weight portions are taken
And 1 the D1 of weight portion be positioned in dispersing apparatus, start stirring, mixing speed arranges 800r/min, is warming up to about 40 DEG C and stirs
About 4h is mixed, is discharged, is obtained porous filtering base material coating.
(2) ultra-high molecular weight polyethylene porous filtering base material is provided, and described in coating on the porous filtering base material
PTFE composition, then solidifies the compositionss to form coating.
Embodiment 5
(1) A3 of 60 weight portions, the A4 of 30 weight portions, the A5 of 10 weight portions, the B1 of 25 weight portions, the C1 of 8 weight portions are taken
And 5 the D2 of weight portion be positioned in dispersing apparatus, start stirring, mixing speed arranges 800r/min, is warming up to about 40 DEG C and stirs
About 4h is mixed, is discharged, is obtained porous filtering base material coating.
(2) ultra-high molecular weight polyethylene porous filtering base material is provided, and described in coating on the porous filtering base material
PTFE composition, then solidifies the compositionss to form coating.
Embodiment 6
(1) A3 of 60 weight portions, the A4 of 30 weight portions, the A5 of 10 weight portions, the B1 of 25 weight portions, the C1 of 8 weight portions are taken
And 3 the D3 of weight portion be positioned in dispersing apparatus, start stirring, mixing speed arranges 800r/min, is warming up to about 40 DEG C and stirs
About 4h is mixed, is discharged, is obtained porous filtering base material coating.
(2) ultra-high molecular weight polyethylene porous filtering base material is provided, and described in coating on the porous filtering base material
PTFE composition, then solidifies the compositionss to form coating.
Embodiment 7
(1) A3 of 60 weight portions, the A4 of 30 weight portions, the A5 of 10 weight portions, the B1 of 25 weight portions, the C1 of 8 weight portions are taken
And 3 the D4 of weight portion be positioned in dispersing apparatus, start stirring, mixing speed arranges 800r/min, is warming up to about 40 DEG C and stirs
About 4h is mixed, is discharged, is obtained porous filtering base material coating.
(2) ultra-high molecular weight polyethylene porous filtering base material is provided, and described in coating on the porous filtering base material
PTFE composition, then solidifies the compositionss to form coating.
Embodiment 8
(1) A3 of 60 weight portions, the A4 of 30 weight portions, the A5 of 10 weight portions, the B1 of 25 weight portions, the C1 of 8 weight portions are taken
And 3 the E4 of weight portion be positioned in dispersing apparatus, start stirring, mixing speed arranges 800r/min, is warming up to about 40 DEG C and stirs
About 4h is mixed, is discharged, is obtained porous filtering base material coating.
(2) ultra-high molecular weight polyethylene porous filtering base material is provided, and described in coating on the porous filtering base material
PTFE composition, then solidifies the compositionss to form coating.
Embodiment 9
(1) A3 of 70 weight portions, the A4 of 20 weight portions, the A5 of 10 weight portions, the B1 of 25 weight portions, the C1 of 8 weight portions are taken
And 3 the D4 of weight portion be positioned in dispersing apparatus, start stirring, mixing speed arranges 800r/min, is warming up to about 40 DEG C and stirs
About 4h is mixed, is discharged, is obtained porous filtering base material coating.
(2) ultra-high molecular weight polyethylene porous filtering base material is provided, and described in coating on the porous filtering base material
PTFE composition, then solidifies the compositionss to form coating.
Embodiment 10
(1) A3 of 70 weight portions, the A4 of 20 weight portions, the A5 of 10 weight portions, the B1 of 25 weight portions, the C1 of 8 weight portions are taken
And 3 the D4 of weight portion be positioned in dispersing apparatus, start stirring, mixing speed arranges 800r/min, is warming up to about 40 DEG C and stirs
About 4h is mixed, is discharged, is obtained porous filtering base material coating.
(2) ultra-high molecular weight polyethylene porous filtering base material is provided, and described in coating on the porous filtering base material
PTFE composition, then compositionss described in vacuum solidification are forming coating.
Method of testing
Filtering accuracy：Calculate according to absolute precision.
Test result is shown in Table 1.
Table 1
Data above can be seen that the coating containing PTFE composition prepared using the application, can be in filtering substrate
Upper to form good coating, the coating has very strong cohesive force and can effectively improve the filtering accuracy of filtering substrate,
It is thus provided that the Advantageous Effects of the present invention.
Aforesaid example is merely illustrative, for explaining some features of the feature of the disclosure.Appended claim
The scope as wide as possible for requiring to be contemplated that is intended to, and embodiments as presented herein is only according to all possible embodiment
Combination selection embodiment explanation.Therefore, the purpose of applicant is appended claim not by the explanation present invention
Feature example selectional restriction.And the progress in science and technology will be formed due to language performance inaccurate reason and not
The possible equivalent or son being presently considered is replaced, and these changes also should be interpreted by appended in the conceived case
Claim is covered.
Claims (7)
1. a kind of PTFE composition, which includes：
The PTFE of 100 weight portions；
The styrene-acrylic copolymer of 2～20 weight portions；And
The Tissuemat E of 1～10 weight portion；
The mean diameter of the PTFE is less than 5 μm；
The PTFE is included：
At least one mean diameter is 4～5 μm of PTFE, and accounts for 1 weight of the total solid weight of PTFE in the compositionss
Amount weight % of % to 98；
At least one mean diameter is 2～3 μm of PTFE, and accounts for 1 weight of the total solid weight of PTFE in the compositionss
Amount weight % of % to 98；With
At least one mean diameter is 0.5～1 μm of PTFE, and accounts for the total solid weight of all PTFE in the compositionss
1 weight % is to 98 weight %；
Described PTFE composition, which also includes the sulfonated polyimide modified graphene oxide of 1～5 weight portion.
2. the PTFE composition of claim 1, which includes：
The PTFE of 100 weight portions；
The styrene-acrylic copolymer of 4～10 weight portions；And
The Tissuemat E of 2～5 weight portions.
3. the PTFE composition of claim 1, wherein the PTFE is included：
At least one mean diameter is 4～5 μm of high molecular PTFE, its number-average molecular weight (Mn) be at least 700,000 and
30 weight % of the total solid weight of PTFE in the compositionss are accounted for 70 weight %；
At least one mean diameter is 2～3 μm of high molecular PTFE, its number-average molecular weight (Mn) be at least 500,000 and
20 weight % of the total solid weight of PTFE in the compositionss are accounted for 40 weight %；It is 0.5～1 with least one mean diameter
μm low-molecular-weight PTFE, its first melt temperature (Tm) is 333 DEG C or lower and accounts for all PTFE in the compositionss
10 weight % of total solid weight are to 50 weight %.
4. the PTFE composition of claim 1, wherein the sulfonated polyimide modified graphene oxide is by comprising amino-terminated
The raw material of sulfonated polyimide prepolymer, epoxy silane coupling agent and graphene oxide is prepared.
5. the PTFE composition of claim 4, wherein the amino-terminated sulfonated polyimide prepolymer by comprising mol ratio is
1：The raw material of the sulfonated diamine and dianhydride of (0.8～0.98) is prepared.
6. a kind of coating for being applied to porous filtering base material, PTFE of the coating comprising any one of Claims 1 to 5 are combined
Thing.
7. a kind of method of coating porous filtering base material, comprises the steps of：
Porous filtering base material is provided；
The PTFE composition of any one of Claims 1 to 5 is coated on the porous filtering base material；With
Solidify the compositionss to form coating.
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| CN101039798A (en) * | 2004-10-06 | 2007-09-19 | 纽约州立大学研究基金会 | High flux and low fouling filtration media |
| CN102838906A (en) * | 2011-06-20 | 2012-12-26 | 刘建林 | Fluoropolymer coating solution and weather-resistant coating obtained therefrom |
| CN103219533A (en) * | 2013-04-12 | 2013-07-24 | 清华大学深圳研究生院 | Composite graphene ion exchange membrane for flow battery and preparation method thereof |
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| CN1387932A (en) * | 2001-05-28 | 2003-01-01 | 北京二元世纪技术有限公司 | Nano-interface separating net with self-cleaning function and its making process and use |
| CN101039798A (en) * | 2004-10-06 | 2007-09-19 | 纽约州立大学研究基金会 | High flux and low fouling filtration media |
| CN102838906A (en) * | 2011-06-20 | 2012-12-26 | 刘建林 | Fluoropolymer coating solution and weather-resistant coating obtained therefrom |
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