CN104497454A - Polytetrafluoroethylene film for filtering air - Google Patents
Polytetrafluoroethylene film for filtering air Download PDFInfo
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- CN104497454A CN104497454A CN201410707660.3A CN201410707660A CN104497454A CN 104497454 A CN104497454 A CN 104497454A CN 201410707660 A CN201410707660 A CN 201410707660A CN 104497454 A CN104497454 A CN 104497454A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L27/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers
- C08L27/02—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L27/12—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
- C08L27/18—Homopolymers or copolymers or tetrafluoroethene
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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
- B01D46/54—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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
- B01D67/0002—Organic membrane manufacture
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/30—Polyalkenyl halides
- B01D71/32—Polyalkenyl halides containing fluorine atoms
- B01D71/36—Polytetrafluoroethene
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F212/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring
- C08F212/02—Monomers containing only one unsaturated aliphatic radical
- C08F212/04—Monomers containing only one unsaturated aliphatic radical containing one ring
- C08F212/06—Hydrocarbons
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- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/12—Esters of monohydric alcohols or phenols
- C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
- C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F291/00—Macromolecular compounds obtained by polymerising monomers on to macromolecular compounds according to more than one of the groups C08F251/00 - C08F289/00
- C08F291/12—Macromolecular compounds obtained by polymerising monomers on to macromolecular compounds according to more than one of the groups C08F251/00 - C08F289/00 on to nitrogen-containing macromolecules
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/12—Esters of monohydric alcohols or phenols
- C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
- C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
- C08F220/1804—C4-(meth)acrylate, e.g. butyl (meth)acrylate, isobutyl (meth)acrylate or tert-butyl (meth)acrylate
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- C08L2203/16—Applications used for films
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- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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Abstract
The invention relates to a preparation method of a film, and particularly relates to a polytetrafluoroethylene film for filtering air. According to the film, the thickness is 15-20nm, the air permeability is 100-120L/m<2>/s; and the filtering accuracy is over 99.99%. The preparation method comprises the following steps: lubricating and mixing, namely mixing PTFE micropowder with a liquid lubricating agent, and standing at 85-90 DEG C for 3-6 hours, so as to form a PTFE material, wherein the liquid lubricating agent comprises aviation kerosene and silicon oil; the adding amount of the aviation kerosene is 10%-30% of mass of the PTFE powder; and the adding amount of the silicon oil is 1-10% of mass of the PTFE powder; forming a blank, and rolling; degreasing and modifying, namely adding an assistant which accounts for 1%-3% of mass of the PTFE powder; longitudinally stretching a PTFE base band for 1.5-2.5 times at 200-250 DEG C, and then forming a degreasing base band, wherein the assistant comprises first elastic rubber and second elastic rubber, which are mixed at the mass ratio of (1-3) to 1; and stretching and sizing, namely transversely stretching the degreasing base band at 215-235 DEG C, sintering, sizing, cooling and solidifying. The PM2.5 intercepting effect of the PTFE film disclosed by the invention is good.
Description
Technical field
The present invention relates to a kind of preparation method of film, particularly relate to a kind of air filtration polytetrafluoroethylene film.
Background technology
Membrane technique obtained huge development between nearest 40 years, and polytetrafluoroethylene (PTFE) film is taken the lead in succeeding in developing by Gore company of the U.S., and the continuous fibril that it is implicative of each other by billions of fine inside forms, and film strength is high, any surface finish.In addition, PTFE unreactiveness and heat-resistant stability have more widened its Application Areas, no matter be under being placed in harsh chemical environment, under being exposed to hot conditions, or require the occasion that bio-compatibility and low chemistry can extract, porous ptfe film can regard as desirable material, is widely used in the ultra-clean filtering materials such as chemical industry, electronics, oil, instrument.But PTFE material linear expansivity is comparatively large, and between-50 DEG C ~ 250 DEG C, PTFE linear expansivity reaches 1.13 × 10
-4/ DEG C ~ 2.16 × 10
-5/ DEG C, be 13 times of iron and steel, easily deform with other materials compound, the phenomenon such as cracking.
In view of in air, PM2.5 remains high, and air problem is subject to the attention of compatriots again.PM2.5 mainly comes from burning, especially utilizes coal to carry out the enterprise generated electricity.If it is huge generating set all to be reconstructed obviously investment.CN1775847(2006-5-24) a kind of air sterilization PTFE microporous membrane preparation method is disclosed, it is mixed by PTFE toner and lubricating oil, pressed compact, calendering, longitudinal stretching, cross directional stretch and heat-setting process complete, and obtained micropore size is 0.12 micron ~ 0.2 micron.Facts have proved, through the film that above-mentioned operation is processed, Air permenbility and filtering accuracy all have much room for improvement.
Summary of the invention
The object of this invention is to provide the air filtration polytetrafluoroethylene film that a kind of PM2.5 interception result is good.
Above-mentioned technical purpose of the present invention is achieved by the following technical programs:
A kind of air filtration polytetrafluoroethylene film, polytetrafluoroethylene film thickness 15 ~ 20nm, Air permenbility is 100-120L/m
2/ s, filtering accuracy is more than 99.99%;
It is prepared from by following steps successively:
(1) lubrication mixing: be that the ptfe micropowder of 0.215 ~ 0.225 micron mix with liquid lubricant by aperture, at the temperature of 85 DEG C ~ 90 DEG C standing 3 ~ 6 hours, makes toner and liquid lubricant fully mix, formation tetrafluoroethylene material;
The degree of crystallinity of described teflon resin micro mist is 98% ~ 99.9%, molecular weight is 2,000,000 ~ 10,000,000;
Described liquid lubricant comprises aviation kerosene and silicone oil, and described aviation kerosene addition is the 10-30% of described ptfe micropowder quality, and described silicone oil addition is the 1-10% of described ptfe micropowder quality;
(2) base calendering: described tetrafluoroethylene material is pressed into cylindrical blank at 60 DEG C ~ 80 DEG C on harder, blank is extruded club by pushing machine at the temperature of 70 DEG C ~ 90 DEG C, then at 70 DEG C ~ 90 DEG C, is rolled into tetrafluoroethylene base band through rolling press;
(3) degreasing modification: add the auxiliary agent accounting for described ptfe micropowder quality 1-3%, by described tetrafluoroethylene base band in 200-250 DEG C of longitudinal stretching 1.5-2.5 doubly rear formation degreasing base band;
Described auxiliary agent comprise by
heavymeasure the first elastic plastic than 1-3:1 mixing and the second elastic plastic;
The solids content that described first elastic plastic comprises 10-35 part weight is the Emulsion acrylic resin of 60-75%, 10-15 part aqueous polyurethane, 3-6 part bamboo charcoal powder, the acrylic resin powder of 5-8 part weight, the solids content of 2-6 part weight are the EVA emulsion of 20-35% and the Chlorinated Polypropylene III of 1-4 part weight;
The preparation method of described Emulsion acrylic resin is: the acrylate monomer mixed solution of preparation 80-110 part weight is stand-by, then the emulsifying agent of 5-7 part weight of several compositions in polyoxyethylene octylphenol ether, sulfonated castor oil, sodium lauryl sulphate, Sodium dodecylbenzene sulfonate, the sodium bicarbonate of 0.3-0.7 part weight and deionized water are joined in reactor, add the 1/3 acrylate monomer mixed solution prepared again wherein, be warming up to 50-90 DEG C, fully stir 20-40min; Be warming up to 60-100 DEG C, drip remaining 2/3 acrylate monomer mixed solution and ammonium persulfate solution initiator, time for adding controls, for 1-4h, to ensure that monomer drips prior to initiator solution; Dropwise rear insulation 1-4h, after cooling, regulate ph value of emulsion to about 7;
The preparation method of described second elastic plastic is: be that the polyvinyl alcohol water solution 25-38 weight part of 30-45% and the aqueous polyurethane aqueous solution 15-20 weight part of 5-10% are heated to 60-80 DEG C by mass concentration, be cooled to 30-50 DEG C and add acrylate 10-15 weight part, then add 0.1-0.2wt% potassium hydroxide 15-20 weight part and be warming up to 100-110 DEG C, then add sclerotin albumen 5-8 weight part, rosin fat 6-9 weight part, the furfuryl alcohol 1-5 weight part extracted from natural phant, the plant phenols 2-4 weight part that extracts from natural phant; React and be cooled to 45-55 DEG C in 3-5 hour, then Sodium Benzoate 0.06-0.08 weight part, ditertiary butyl peroxide 0.01-0.02 weight part, catalyzer 1-5 part and vinyl acetic monomer 0.1-0.3 weight part is added, stir 1-1.5 hour, cooling, obtained described second elastic plastic;
(4) drawing and setting: by described degreasing base band cross directional stretch at 215 DEG C ~ 235 DEG C, then 280 DEG C ~ 330 DEG C sintering sizings, sintering time 90 ~ 100 seconds, obtains heat-setting thin-film;
(5) cooling curing: by described heat-setting thin-film spraying cooling water, described temperature of cooling water is 10 DEG C ~ 20 DEG C, 30 ~ 50 seconds cool water shower time, and hydraulic pressure 2000 handkerchief-3000 handkerchief, makes the film after heat setting type be down to 40-50 DEG C.
Auxiliary agent of the present invention not only environmental protection, water-fast, mildew-resistant, give tetrafluoroethylene base band of the present invention and have better bactericidal properties, stability, dispersing property and bond properties; Increase bactericidal properties and the mildew resistance of polytetrafluoroethylene film.
The tetrafluoroethylene high-precision filtration film that the present invention obtains has better toughness, can by La get evenly, when film is shaping can percentage of open area high and pore size distribution is more even.This filtering membrane is compounded in Nomex, can be used for the filtration of high-temperature flue gas after glass-fiber-fabric or aramid felt, while guarantee filtration flux, very good to the interception result of PM2.5, though quantity discharged large more also can control PM2.5 quantity discharged at 10mg/m
3below.
Polytetrafluoroethylene film thickness 15 ~ 20nm prepared by the method for the invention, Air permenbility is 100-120L/m
2/ s, filtering accuracy is more than 99.99%;
Film lateral shrinkage is less than 3% simultaneously, and longitudinal contraction rate is less than 5%.And the lateral shrinkage of two-way stretch polytetrafluoroethylmicroporous microporous membrane prepared by prior art is about 20%, longitudinal contraction rate is about 30%.
As preferably, described tetrafluoroethylene material is specifically pressed into the cylindrical blank that diameter is 30-50mm by described base at 70 DEG C on harder, blank is extruded by pushing machine the cylindrical bar thing that diameter is 8-15mm at the temperature of 80 DEG C, then at 70 DEG C ~ 90 DEG C, is rolled into tetrafluoroethylene base band through rolling press.
As preferably, described preparation method also comprises the polytetrafluoroethylene film obtained after cooling curing is formed air filtration polytetrafluoroethylene film by applying gluing being compounded on Nomex, glass-fiber-fabric or aramid felt of described auxiliary agent.
As preferably, described auxiliary agent applied amount is the 3-5% of described polytetrafluoroethylene film quality.
As preferably, described polytetrafluoroethylene film lateral shrinkage is less than 3%, and longitudinal contraction rate is less than 5%.
As preferably, the catalyzer in described second elastic plastic is sodium hydroxide.
As preferably, the concrete preparation method of described bamboo charcoal powder is:
A. raw material pre-treatment: bamboo is sent in microwave vacuum tank, be evacuated to vacuum tightness for-0.02MPa ~-0.001MPa, then carry out microwave treatment, microwave frequency is 300MHz ~ 950MHz, and microwave treatment time is 1 ~ 3min;
B. primary carbon preparation: the bamboo through raw material pre-treatment gained is experienced successively drying, pre-charing, charing, calcining and cooling, control calcining and be incubated 40-80min with the ramp of 5-15 DEG C/min to 700-750 DEG C, and then be incubated 2-8h with the ramp of 5-15 DEG C/min to 1000-1500 DEG C, then 300-400 DEG C is cooled to the speed of 18-25 DEG C/min, cool to room temperature with the furnace again, obtain primary carbon;
C. then activation treatment: by gained primary carbon and 140-160g/L polymaleic acid and 40-70g/L inferior sodium phosphate mixed solution 1:3-4 mixing submergence 3-5h is in mass ratio neutral by washed with de-ionized water to pH value;
D. granulate.
Contriver selects specific activation treatment to coordinate raw material pre-treatment and primary carbon preparation, obtains the bamboo charcoal powder with high bacteriostasis rate and antibacterial value; Meanwhile, bamboo charcoal powder, as the interpolation raw material of auxiliary agent, can further improve again the biocidal property of auxiliary agent, stability, dispersiveness and binding property, while raising tetrafluoroethylene degreasing effect, can improve polytetrafluoroethylene film tensile performance in wale-wise.
As preferably, described Emulsion acrylic resin is synthesized as monomer and emulsifying agent, ammonium persulfate initiator, sodium bicarbonate and deionized water by any one or a few in any one or a few in methyl methacrylate, β-dimethyl-aminoethylmethacrylate, butyl methacrylate, butyl acrylate, Propenoic acid, 2-methyl, isobutyl ester, dodecylacrylate, octadecyl acrylate and methacrylic acid, vinylformic acid, acrylamide, vinyl cyanide, Methacrylamide, vinylbenzene.
As preferably, the described furfuryl alcohol extracted from natural phant is selected from the furfuryl alcohol extracted from the wheat bran or bamboo wood chip of the core slag of corn cob, oat or wheat.
As preferably, the described plant phenols extracted from natural phant is Eugenol or cardanol.
As preferably, also containing nanometer silver 5 × 10 in described auxiliary agent
-5-9 × 10
-5part;
Described nanometer silver is prepared from according to following steps:
A. sodium dodecyl sulfate solution, water polyacrylic acid and hydrazine hydrate solution are added in silver nitrate aqueous solution and obtain mixed solution, the mol ratio of described sodium laurylsulfonate and Silver Nitrate is 4-6:1; The mol ratio of described water polyacrylic acid and Silver Nitrate is 0.4-0.6:1; ; The mol ratio of described hydrazine hydrate and Silver Nitrate is 0.2-0.3:1;
B. in described mixed solution, add crown ether and sodium-metaphosphate, the mol ratio of described crown ether and Silver Nitrate is 3-5:1; The mol ratio of described sodium-metaphosphate and Silver Nitrate is 0.8-1.3:1, and control ph is 8-9, obtains nanometer silver.
Crown ether have hydrophobic external skeletal and hydrophilic can with the inner chamber of metal ion Cheng Jian, stable title complex can be formed with alkalimetal ion.Meanwhile, the present invention is engaged in follow-up reduction reaction and adds sodium-metaphosphate, makes on the one hand free in reaction system or exposed reduction negative ion have higher reactive behavior; Meanwhile, after basic metal and crown ether generation ligand complex, alkali metal cation is coated in inner chamber by crown ether, just pulls open the distance in nanometer silver system between positive and negative charge thus, make nanometer silver can stable dispersion in the aqueous solution, not easily reunite.
In sum, the present invention has following beneficial effect:
(1) the tetrafluoroethylene high-precision filtration film that the present invention obtains has better toughness, can by La get evenly, when film is shaping can percentage of open area high and pore size distribution is more even, thickness is little, especially be applicable to preparing composite membrane, such as, can be compounded in Nomex, the filtration of high-temperature flue gas after glass-fiber-fabric or aramid felt, can be used for, while guarantee filtration flux, very good to the interception result of PM2.5;
(2) owing to adopting treatment of cooling water after film thermal sizing, reduce film temperature rapidly, cooling time is short, effective, and technique is simple, and processing cost is low;
(3) in use or storage process, can not reduce aperture because film dimensions is shunk, therefore the horizontal and vertical size of film is kept.
Embodiment
Embodiment one
Auxiliary agent comprises the first elastic plastic and the second elastic plastic that mix by weight 1:1;
The solids content that first elastic plastic comprises 10 parts of weight is the Emulsion acrylic resin of 60%, 10 parts of aqueous polyurethanes, 3 parts of bamboo charcoal powder, the acrylic resin powder of 5 parts of weight, the solids content of 2 parts of weight are the EVA emulsion of 20% and the Chlorinated Polypropylene III of 1 part of weight;
The preparation of Emulsion acrylic resin:
4.63 parts of polyoxyethylene octylphenol ethers (OP-10), 1.67 parts of sodium lauryl sulphate, 0.6 part of sodium bicarbonate are dissolved in 70 parts of deionized waters, then add in reactor, are warming up to about 70 DEG C; Take 1.3 parts of methyl methacrylates, 2.14 parts of vinylbenzene, 50.9 parts of butyl acrylates, 29.08 parts of Isooctyl acrylate monomers, 2.45 parts of butyl methacrylate, 1.8 parts of vinyl cyanide, 0.8 part of vinylformic acid and 1.44 parts of methacrylic acids make mix monomer; 1/3 part of mix monomer is added in reactor, at 85 DEG C of pre-emulsification 30min; Then 0.45 part of initiator ammonium persulfate (APS) joined and make solution in 50 parts of deionized waters and drop to gradually in reactor, drip residual monomer, about 3h dropwises simultaneously, controls mix monomer and drips prior to initiator solution; After dropwising, after insulation 1h, namely can be made into stand-by emulsion;
The preparation of acrylic resin powder: 3 parts of BPO are dissolved in 13.3 parts of methyl methacrylates, 61 parts of vinylbenzene, 21.4 parts of n-butyl acrylates and 4.3 parts of acrylic acid mix monomers; The mix monomer being dissolved with initiator is joined and is dissolved with in 500 parts of deionized waters of 7.5 parts of protective colloids, high-speed stirring, in 30min, be warming up to 85 DEG C simultaneously; Product is collected after insulation reaction 4h; Product is dried after pulverizing, make acrylic resin powder with 200 eye mesh screens filtrations stand-by.
The preparation method of the second elastic plastic is: be that polyvinyl alcohol water solution 25 weight part of 30% and the aqueous polyurethane aqueous solution 15 weight part of 5% are heated to 60 DEG C by mass concentration, be cooled to 30 DEG C and add acrylate 10 weight part, then add 0.1wt% potassium hydroxide 15 weight part and be warming up to 100 DEG C, then add sclerotin albumen 5 weight part, rosin fat 6 weight part, furfuryl alcohol 1 weight part extracted from bamboo wood chip, Eugenol 2 weight part; React and be cooled to 45 DEG C in 3 hours, then add Sodium Benzoate 0.06 weight part, ditertiary butyl peroxide 0.01 weight part, 1 part, sodium hydroxide and vinyl acetic monomer 0.1 weight part, stir 1 hour, cooling, obtained described second elastic plastic.
Bamboo charcoal powder obtains through raw material pre-treatment, primary carbon preparation, activation treatment and granulation step; The concrete preparation method of bamboo charcoal powder is:
A. raw material pre-treatment: bamboo is sent in microwave vacuum tank, be evacuated to vacuum tightness for-0.01MPa, then carry out microwave treatment, microwave frequency is 650MHz, and microwave treatment time is 2min;
B. primary carbon preparation: the bamboo through raw material pre-treatment gained is experienced successively drying, pre-charing, charing, calcining and cooling, controlling calcining with the ramp to 730 of 10 DEG C/min DEG C is incubated 50min, and then be incubated 6h with the ramp to 1300 of 8 DEG C/min DEG C, then 350 DEG C are cooled to the speed of 22 DEG C/min, cool to room temperature with the furnace again, obtain primary carbon;
C. then activation treatment: by gained primary carbon and 140-160g/L polymaleic acid and 60g/L inferior sodium phosphate mixed solution 1:3.5 mixing submergence 4h is in mass ratio neutral by washed with de-ionized water to pH value;
D. granulate.
The preparation method of air filtration polytetrafluoroethylene film comprises the following steps successively:
(1) lubrication mixing: be that the ptfe micropowder of 0.215 micron mix with liquid lubricant by aperture, at the temperature of 85 DEG C standing 3 hours, makes toner and liquid lubricant fully mix, formation tetrafluoroethylene material;
The degree of crystallinity of teflon resin micro mist is 98% ~ 99.9%, molecular weight is 2,000,000 ~ 3,000,000;
Liquid lubricant comprises aviation kerosene and silicone oil, and aviation kerosene addition is 10% of ptfe micropowder quality, and silicone oil addition is 1% of ptfe micropowder quality;
(2) base calendering: tetrafluoroethylene material is pressed into cylindrical blank at 60 DEG C on harder, blank is extruded club by pushing machine at the temperature of 70 DEG C, is then rolled into tetrafluoroethylene base band through rolling press at 70 DEG C;
(3) degreasing modification: add the auxiliary agent accounting for ptfe micropowder quality 1%, forms degreasing base band by tetrafluoroethylene base band afterwards 200 DEG C of longitudinal stretchings 1.5 times;
(4) drawing and setting: by degreasing base band cross directional stretch at 215 DEG C, then 280 DEG C of sintering sizings, sintering time 90 seconds, obtains heat-setting thin-film;
(5) cooling curing: by heat-setting thin-film spraying cooling water, temperature of cooling water is 10 DEG C, 30 seconds cool water shower time, and hydraulic pressure 2000 handkerchief makes the film after heat setting type be down to 40 DEG C.
After testing, polytetrafluoroethylene film is used for the filtration of high-temperature flue gas, and PM2.5 quantity discharged is at 10mg/m
3below; The polytetrafluoroethylmicroporous microporous membrane material of preparation, lateral shrinkage is 2.7%, and longitudinal contraction rate is 4%; The polytetrafluoroethylene film thickness 15 ~ 20nm of preparation, Air permenbility is 100-120L/m
2/ s, filtering accuracy is more than 99.99%.
Embodiment two
Auxiliary agent comprises the first elastic plastic and the second elastic plastic that mix by weight 3:1;
The solids content that first elastic plastic comprises 35 parts of weight is the Emulsion acrylic resin of 75%, 15 parts of aqueous polyurethanes, 5 parts of bamboo charcoal powder, the acrylic resin powder of 8 parts of weight, the solids content of 6 parts of weight are the EVA emulsion of 35% and the Chlorinated Polypropylene III of 4 parts of weight;
The preparation of Emulsion acrylic resin: 5.28 parts of sulfonated castor oils, 1.84 parts of sodium lauryl sulphate, 0.66 part of sodium bicarbonate are dissolved in 70 parts of deionized waters, then join in reactor, are warming up to about 70 DEG C; Take 6.12 parts of methyl methacrylates, 62.78 parts of butyl acrylates, 11.58 parts of vinylbenzene, 7.35 parts of butyl methacrylate, 0.88 part of vinylformic acid, 1.58 parts of methacrylic acids, 8.7 parts of Isooctyl acrylate monomers make mix monomer; 1/3 part of mix monomer is added in reactor, at 85 DEG C of pre-emulsification 30min; Then joined by 0.5 part of initiator A PS and make solution in 50 parts of deionized waters and drop to gradually in reactor, drip residual monomer, about 3h dropwises simultaneously, controls mix monomer and drips prior to initiator solution; After dropwising, after insulation 1h, namely can be made into stand-by emulsion;
The preparation of acrylic resin powder: 4 parts of BPO are dissolved in 15.96 parts of methyl methacrylates, 65 parts of vinylbenzene, 23.54 parts of n-butyl acrylates, 4.3 parts of acrylic acid mix monomers; The mix monomer being dissolved with initiator is joined and is dissolved with in 600 parts of deionized waters of 8 parts of protective colloids, high-speed stirring, in 30min, be warming up to 85 DEG C simultaneously; Product is collected after insulation reaction 4h; Product is dried after pulverizing, make acrylic resin powder with 200 eye mesh screens filtrations stand-by.
The preparation method of the second elastic plastic is: be that polyvinyl alcohol water solution 29 weight part of 38% and the aqueous polyurethane aqueous solution 18 weight part of 8% are heated to 70 DEG C by mass concentration, be cooled to 40 DEG C and add acrylate 13 weight part, then add 0.15wt% potassium hydroxide 18 weight part and be warming up to 105 DEG C, then add sclerotin albumen 6 weight part, rosin fat 7 weight part, furfuryl alcohol 1-5 weight part, cardanol 3 weight part from the wheat bran extraction of oat or wheat; React and be cooled to 48 DEG C in 4 hours, then add Sodium Benzoate 0.07 weight part, ditertiary butyl peroxide 0.015 weight part, 4 parts, sodium hydroxide and vinyl acetic monomer 0.2 weight part, stir 1.2 hours, cooling, obtained described second elastic plastic.
Bamboo charcoal powder obtains through raw material pre-treatment, primary carbon preparation, activation treatment and granulation step; The concrete preparation method of bamboo charcoal powder is:
A. raw material pre-treatment: bamboo is sent in microwave vacuum tank, be evacuated to vacuum tightness for-0.001MPa, then carry out microwave treatment, microwave frequency is 950MHz, and microwave treatment time is 3min;
B. primary carbon preparation: the bamboo through raw material pre-treatment gained is experienced successively drying, pre-charing, charing, calcining and cooling, controlling calcining with the ramp to 750 of 15 DEG C/min DEG C is incubated 80min, and then be incubated 2-8h with the ramp to 1500 of 15 DEG C/min DEG C, then 400 DEG C are cooled to the speed of 25 DEG C/min, cool to room temperature with the furnace again, obtain primary carbon;
C. then activation treatment: by gained primary carbon and 160g/L polymaleic acid and 70g/L inferior sodium phosphate mixed solution 1:4 mixing submergence 5h is in mass ratio neutral by washed with de-ionized water to pH value;
D. granulate.
The preparation method of air filtration polytetrafluoroethylene film comprises the following steps successively:
(1) lubrication mixing: be that the ptfe micropowder of 0.22 micron mix with liquid lubricant by aperture, at the temperature of 88 DEG C standing 5 hours, makes toner and liquid lubricant fully mix, formation tetrafluoroethylene material;
The degree of crystallinity of teflon resin micro mist is 98% ~ 99.9%, molecular weight is 6,000,000 ~ 8,000,000;
Liquid lubricant comprises aviation kerosene and silicone oil, and aviation kerosene addition is 19% of ptfe micropowder quality, and silicone oil addition is 7% of ptfe micropowder quality;
(2) base calendering: tetrafluoroethylene material is pressed into cylindrical blank at 70 DEG C on harder, blank is extruded club by pushing machine at the temperature of 80 DEG C, is then rolled into tetrafluoroethylene base band through rolling press at 80 DEG C;
(3) degreasing modification: add the auxiliary agent accounting for ptfe micropowder quality 2%, forms degreasing base band by tetrafluoroethylene base band afterwards 220 DEG C of longitudinal stretchings 2 times;
(4) drawing and setting: by degreasing base band cross directional stretch at 225 DEG C, then 300 DEG C of sintering sizings, sintering time 95 seconds, obtains heat-setting thin-film;
(5) cooling curing: by heat-setting thin-film spraying cooling water, temperature of cooling water is 15 DEG C, 40 seconds cool water shower time, and hydraulic pressure 2500 handkerchief makes the film after heat setting type be down to 46 DEG C.
After testing, polytetrafluoroethylene film is used for the filtration of high-temperature flue gas, and PM2.5 quantity discharged is at 10mg/m
3below; The polytetrafluoroethylmicroporous microporous membrane material of preparation, lateral shrinkage is 1.7%, and longitudinal contraction rate is 3%; The polytetrafluoroethylene film thickness 18nm of preparation, Air permenbility is 110L/m
2/ s, filtering accuracy is more than 99.99%.
Embodiment three
Auxiliary agent comprises the first elastic plastic and the second elastic plastic that mix by weight 2:1;
The solids content that first elastic plastic comprises 25 parts of weight is the Emulsion acrylic resin of 65%, 12 parts of aqueous polyurethanes, 6 parts of bamboo charcoal powder, the acrylic resin powder of 7 parts of weight, the solids content of 5 parts of weight are the EVA emulsion of 28% and the Chlorinated Polypropylene III of 3 parts of weight;
The preparation of Emulsion acrylic resin: 4.5 parts of OP-10,1.62 parts of sodium lauryl sulphate, 0.55 part of sodium bicarbonate are dissolved in 70 parts of deionized waters, then join in reactor, are warming up to about 70 DEG C; Take 5.42 parts of methyl methacrylates, 54.79 parts of butyl acrylates, 10.11 parts of vinylbenzene, 6.55 parts of butyl methacrylate, 0.76 part of vinylformic acid, 1.41 parts of methacrylic acids, 7.83 parts of Isooctyl acrylate monomers make mix monomer; 1/3 part of mix monomer is added in reactor, at 85 DEG C of pre-emulsification 30min; Then joined by 0.42 part of initiator A PS and make solution in 50 parts of deionized waters and drop to gradually in reactor, drip residual monomer, about 3h dropwises simultaneously, controls mix monomer and drips prior to initiator solution; After dropwising, after insulation 1h, namely can be made into stand-by emulsion;
The preparation of acrylic resin powder: 2.7 parts of BPO are dissolved in 11.97 parts of methyl methacrylates, 57.95 parts of vinylbenzene, 19.26 parts of n-butyl acrylates, 4.1 parts of acrylic acid mix monomers; The mix monomer being dissolved with initiator is joined and is dissolved with in 420 parts of deionized waters of 6 parts of protective colloids, high-speed stirring, in 30min, be warming up to 85 DEG C simultaneously; Product is collected after insulation reaction 4h; Product is dried after pulverizing, make acrylic resin powder with 200 eye mesh screens filtrations stand-by;
The preparation method of the second elastic plastic is: be that polyvinyl alcohol water solution 38 weight part of 45% and the aqueous polyurethane aqueous solution 20 weight part of 10% are heated to 80 DEG C by mass concentration, be cooled to 50 DEG C and add acrylate 15 weight part, then add 0.2wt% potassium hydroxide 20 weight part and be warming up to 110 DEG C, then add sclerotin albumen 8 weight part, rosin fat 9 weight part, furfuryl alcohol 5 weight part, Eugenol 4 weight part that extract from the core slag of corn cob; React and be cooled to 55 DEG C in 5 hours, then add Sodium Benzoate 0.08 weight part, ditertiary butyl peroxide 0.02 weight part, 5 parts, sodium hydroxide and vinyl acetic monomer 0.3 weight part, stir 1.5 hours, cooling, obtained described second elastic plastic.
Bamboo charcoal powder obtains through raw material pre-treatment, primary carbon preparation, activation treatment and granulation step; The concrete preparation method of bamboo charcoal powder is:
A. raw material pre-treatment: bamboo is sent in microwave vacuum tank, be evacuated to vacuum tightness for-0.02MPa, then carry out microwave treatment, microwave frequency is 300MHz, and microwave treatment time is 1min;
B. primary carbon preparation: the bamboo through raw material pre-treatment gained is experienced successively drying, pre-charing, charing, calcining and cooling, controlling calcining with the ramp to 700 of 5 DEG C/min DEG C is incubated 40min, and then be incubated 2h with the ramp to 1000 of 5 DEG C/min DEG C, then 300 DEG C are cooled to the speed of 18 DEG C/min, cool to room temperature with the furnace again, obtain primary carbon;
C. then activation treatment: by gained primary carbon and 140g/L polymaleic acid and 40g/L inferior sodium phosphate mixed solution 1:3 mixing submergence 3h is in mass ratio neutral by washed with de-ionized water to pH value;
D. granulate.
The preparation method of air filtration polytetrafluoroethylene film comprises the following steps successively:
(1) lubrication mixing: be that the ptfe micropowder of 0.225 micron mix with liquid lubricant by aperture, at the temperature of 90 DEG C standing 6 hours, makes toner and liquid lubricant fully mix, formation tetrafluoroethylene material;
The degree of crystallinity of teflon resin micro mist is 98% ~ 99.9%, molecular weight is 8,000,000 ~ 10,000,000;
Liquid lubricant comprises aviation kerosene and silicone oil, and aviation kerosene addition is 30% of ptfe micropowder quality, and silicone oil addition is 10% of ptfe micropowder quality;
(2) base calendering: tetrafluoroethylene material is pressed into cylindrical blank at 80 DEG C on harder, blank is extruded club by pushing machine at the temperature of 90 DEG C, is then rolled into tetrafluoroethylene base band through rolling press at 90 DEG C;
(3) degreasing modification: add the auxiliary agent accounting for ptfe micropowder quality 3%, forms degreasing base band by tetrafluoroethylene base band afterwards 250 DEG C of longitudinal stretchings 2.5 times;
(4) drawing and setting: by degreasing base band cross directional stretch at 215 DEG C ~ 235 DEG C, then 330 DEG C of sintering sizings, sintering time 100 seconds, obtains heat-setting thin-film;
(5) cooling curing: by heat-setting thin-film spraying cooling water, temperature of cooling water is 20 DEG C, 50 seconds cool water shower time, and hydraulic pressure 3000 handkerchief makes the film after heat setting type be down to 50 DEG C.
After testing, polytetrafluoroethylene film is used for the filtration of high-temperature flue gas, and PM2.5 quantity discharged is at 10mg/m
3below; The polytetrafluoroethylmicroporous microporous membrane material of preparation, lateral shrinkage is 1.5%, and longitudinal contraction rate is 1%; The polytetrafluoroethylene film thickness 20nm of preparation, Air permenbility is 120L/m
2/ s, filtering accuracy is more than 99.99%.
Embodiment four
With embodiment one, specifically described tetrafluoroethylene material is pressed into the cylindrical blank that diameter is 30mm at 70 DEG C on harder unlike base, blank is extruded by pushing machine the cylindrical bar thing that diameter is 8mm at the temperature of 80 DEG C, then at 70 DEG C DEG C, is rolled into tetrafluoroethylene base band through rolling press.
Also containing nanometer silver 5 × 10 in auxiliary agent
-5part;
Nanometer silver is prepared from according to following steps:
A. sodium dodecyl sulfate solution, water polyacrylic acid and hydrazine hydrate solution are added in silver nitrate aqueous solution and obtain mixed solution, the mol ratio of sodium laurylsulfonate and Silver Nitrate is 4:1; The mol ratio of water polyacrylic acid and Silver Nitrate is 0.4:1; The mol ratio of hydrazine hydrate and Silver Nitrate is 0.2:1;
B. in mixed solution, add crown ether and sodium-metaphosphate, the mol ratio of crown ether and Silver Nitrate is 3:1; The mol ratio of sodium-metaphosphate and Silver Nitrate is 0.8:1, and control ph is 8, obtains nanometer silver.
Preparation method also comprises the polytetrafluoroethylene film obtained after cooling curing is formed air filtration polytetrafluoroethylene film by applying the gluing Nomex that is compounded in of described auxiliary agent; Auxiliary agent applied amount is 3% of described polytetrafluoroethylene film quality.
Embodiment five
With embodiment one, specifically described tetrafluoroethylene material is pressed into the cylindrical blank that diameter is 50mm at 70 DEG C on harder unlike base, blank is extruded by pushing machine the cylindrical bar thing that diameter is 15mm at the temperature of 80 DEG C, then at 90 DEG C, is rolled into tetrafluoroethylene base band through rolling press.
Also containing nanometer silver 9 × 10 in auxiliary agent
-5part;
Nanometer silver is prepared from according to following steps:
A. sodium dodecyl sulfate solution, water polyacrylic acid and hydrazine hydrate solution are added in silver nitrate aqueous solution and obtain mixed solution, the mol ratio of sodium laurylsulfonate and Silver Nitrate is 6:1; The mol ratio of water polyacrylic acid and Silver Nitrate is 0.6:1; ; The mol ratio of hydrazine hydrate and Silver Nitrate is 0.3:1;
B. in mixed solution, add crown ether and sodium-metaphosphate, the mol ratio of crown ether and Silver Nitrate is 5:1; The mol ratio of sodium-metaphosphate and Silver Nitrate is 1.3:1, and control ph is 9, obtains nanometer silver.
Preparation method also comprises the polytetrafluoroethylene film obtained after cooling curing is formed air filtration polytetrafluoroethylene film by applying auxiliary agent gluing being compounded on glass-fiber-fabric.Auxiliary agent applied amount is 5% of polytetrafluoroethylene film quality.
Embodiment six
With embodiment one, specifically tetrafluoroethylene material is pressed into the cylindrical blank that diameter is 40mm at 70 DEG C on harder unlike base, blank is extruded by pushing machine the cylindrical bar thing that diameter is 10mm at the temperature of 80 DEG C, then at 80 DEG C, is rolled into tetrafluoroethylene base band through rolling press.
Also containing nanometer silver 7 × 10 in auxiliary agent
-5part;
Nanometer silver is prepared from according to following steps:
A. sodium dodecyl sulfate solution, water polyacrylic acid and hydrazine hydrate solution are added in silver nitrate aqueous solution and obtain mixed solution, the mol ratio of sodium laurylsulfonate and Silver Nitrate is 5:1; The mol ratio of water polyacrylic acid and Silver Nitrate is 0.5:1; ; The mol ratio of hydrazine hydrate and Silver Nitrate is 0.25:1;
B. in mixed solution, add crown ether and sodium-metaphosphate, the mol ratio of crown ether and Silver Nitrate is 4:1; The mol ratio of sodium-metaphosphate and Silver Nitrate is 0.9:1, and control ph is 8, obtains nanometer silver.
Preparation method also comprises the polytetrafluoroethylene film obtained after cooling curing is formed air filtration polytetrafluoroethylene film by applying described auxiliary agent gluing being compounded on aramid felt.Auxiliary agent applied amount is 4% of described polytetrafluoroethylene film quality.
This specific embodiment is only explanation of the invention; it is not limitation of the present invention; those skilled in the art can make to the present embodiment the amendment not having creative contribution as required after reading this specification sheets, as long as but be all subject to the protection of patent law in right of the present invention.
Claims (10)
1. an air filtration polytetrafluoroethylene film, is characterized in that polytetrafluoroethylene film thickness 15 ~ 20nm, and Air permenbility is 100-120L/m
2/ s, filtering accuracy is more than 99.99%;
It is prepared from by following steps successively:
(1) lubrication mixing: be that the ptfe micropowder of 0.215 ~ 0.225 micron mix with liquid lubricant by aperture, at the temperature of 85 DEG C ~ 90 DEG C standing 3 ~ 6 hours, makes toner and liquid lubricant fully mix, formation tetrafluoroethylene material;
The degree of crystallinity of described teflon resin micro mist is 98% ~ 99.9%, molecular weight is 2,000,000 ~ 10,000,000;
Described liquid lubricant comprises aviation kerosene and silicone oil, and described aviation kerosene addition is the 10-30% of described ptfe micropowder quality, and described silicone oil addition is the 1-10% of described ptfe micropowder quality;
(2) base calendering: described tetrafluoroethylene material is pressed into cylindrical blank at 60 DEG C ~ 80 DEG C on harder, blank is extruded club by pushing machine at the temperature of 70 DEG C ~ 90 DEG C, then at 70 DEG C ~ 90 DEG C, is rolled into tetrafluoroethylene base band through rolling press;
(3) degreasing modification: add the auxiliary agent accounting for described ptfe micropowder quality 1-3%, by described tetrafluoroethylene base band in 200-250 DEG C of longitudinal stretching 1.5-2.5 doubly rear formation degreasing base band;
Described auxiliary agent comprise by
heavymeasure the first elastic plastic than 1-3:1 mixing and the second elastic plastic;
The solids content that described first elastic plastic comprises 10-35 part weight is the Emulsion acrylic resin of 60-75%, 10-15 part aqueous polyurethane, 3-6 part bamboo charcoal powder, the acrylic resin powder of 5-8 part weight, the solids content of 2-6 part weight are the EVA emulsion of 20-35% and the Chlorinated Polypropylene III of 1-4 part weight;
The preparation method of described Emulsion acrylic resin is: the acrylate monomer mixed solution of preparation 80-110 part weight is stand-by, then the emulsifying agent of 5-7 part weight of several compositions in polyoxyethylene octylphenol ether, sulfonated castor oil, sodium lauryl sulphate, Sodium dodecylbenzene sulfonate, the sodium bicarbonate of 0.3-0.7 part weight and deionized water are joined in reactor, add the 1/3 acrylate monomer mixed solution prepared again wherein, be warming up to 50-90 DEG C, fully stir 20-40min; Be warming up to 60-100 DEG C, drip remaining 2/3 acrylate monomer mixed solution and ammonium persulfate solution initiator, time for adding controls, for 1-4h, to ensure that monomer drips prior to initiator solution; Dropwise rear insulation 1-4h, after cooling, regulate ph value of emulsion to about 7;
The preparation method of described second elastic plastic is: be that the polyvinyl alcohol water solution 25-38 weight part of 30-45% and the aqueous polyurethane aqueous solution 15-20 weight part of 5-10% are heated to 60-80 DEG C by mass concentration, be cooled to 30-50 DEG C and add acrylate 10-15 weight part, then add 0.1-0.2wt% potassium hydroxide 15-20 weight part and be warming up to 100-110 DEG C, then add sclerotin albumen 5-8 weight part, rosin fat 6-9 weight part, the furfuryl alcohol 1-5 weight part extracted from natural phant, the plant phenols 2-4 weight part that extracts from natural phant; React and be cooled to 45-55 DEG C in 3-5 hour, then Sodium Benzoate 0.06-0.08 weight part, ditertiary butyl peroxide 0.01-0.02 weight part, catalyzer 1-5 part and vinyl acetic monomer 0.1-0.3 weight part is added, stir 1-1.5 hour, cooling, obtained described second elastic plastic;
(4) drawing and setting: by described degreasing base band cross directional stretch at 215 DEG C ~ 235 DEG C, then 280 DEG C ~ 330 DEG C sintering sizings, sintering time 90 ~ 100 seconds, obtains heat-setting thin-film;
(5) cooling curing: by described heat-setting thin-film spraying cooling water, described temperature of cooling water is 10 DEG C ~ 20 DEG C, 30 ~ 50 seconds cool water shower time, and hydraulic pressure 2000 handkerchief-3000 handkerchief, makes the film after heat setting type be down to 40-50 DEG C.
2. a kind of air filtration polytetrafluoroethylene film according to claim 1, it is characterized in that: described tetrafluoroethylene material is specifically pressed into the cylindrical blank that diameter is 30-50mm by described base at 70 DEG C on harder, blank is extruded by pushing machine the cylindrical bar thing that diameter is 8-15mm at the temperature of 80 DEG C, then at 70 DEG C ~ 90 DEG C, is rolled into tetrafluoroethylene base band through rolling press.
3. a kind of air filtration polytetrafluoroethylene film according to claim 2, is characterized in that: described preparation method also comprises the polytetrafluoroethylene film obtained after cooling curing is formed air filtration polytetrafluoroethylene film by applying described auxiliary agent gluing being compounded on Nomex, glass-fiber-fabric or aramid felt.
4. a kind of air filtration polytetrafluoroethylene film according to claim 3, is characterized in that: described auxiliary agent applied amount is the 3-5% of described polytetrafluoroethylene film quality.
5. a kind of air filtration polytetrafluoroethylene film according to claim 4, is characterized in that: the catalyzer in described second elastic plastic is sodium hydroxide.
6. a kind of air filtration polytetrafluoroethylene film according to claim 5, is characterized in that: the concrete preparation method of described bamboo charcoal powder is:
Raw material pre-treatment: bamboo is sent in microwave vacuum tank, be evacuated to vacuum tightness for-0.02MPa ~-0.001MPa, then carry out microwave treatment, microwave frequency is 300MHz ~ 950MHz, and microwave treatment time is 1 ~ 3min;
Prepared by primary carbon: the bamboo through raw material pre-treatment gained is experienced successively drying, pre-charing, charing, calcining and cooling, control calcining and be incubated 40-80min with the ramp of 5-15 DEG C/min to 700-750 DEG C, and then be incubated 2-8h with the ramp of 5-15 DEG C/min to 1000-1500 DEG C, then 300-400 DEG C is cooled to the speed of 18-25 DEG C/min, cool to room temperature with the furnace again, obtain primary carbon;
Then activation treatment: by gained primary carbon and 140-160g/L polymaleic acid and 40-70g/L inferior sodium phosphate mixed solution 1:3-4 mixing submergence 3-5h is in mass ratio neutral by washed with de-ionized water to pH value;
Granulate.
7. a kind of air filtration polytetrafluoroethylene film according to claim 6, is characterized in that: described Emulsion acrylic resin is synthesized as monomer and emulsifying agent, ammonium persulfate initiator, sodium bicarbonate and deionized water by any one or a few in any one or a few in methyl methacrylate, β-dimethyl-aminoethylmethacrylate, butyl methacrylate, butyl acrylate, Propenoic acid, 2-methyl, isobutyl ester, dodecylacrylate, octadecyl acrylate and methacrylic acid, vinylformic acid, acrylamide, vinyl cyanide, Methacrylamide, vinylbenzene.
8. a kind of air filtration polytetrafluoroethylene film according to claim 7, is characterized in that: the described furfuryl alcohol extracted from natural phant is selected from the furfuryl alcohol extracted from the wheat bran or bamboo wood chip of the core slag of corn cob, oat or wheat.
9. a kind of air filtration polytetrafluoroethylene film according to claim 8, is characterized in that: the described plant phenols extracted from natural phant is Eugenol or cardanol.
10. a kind of air filtration polytetrafluoroethylene film according to claim 9, is characterized in that: also containing nanometer silver 5 × 10 in described auxiliary agent
-5-9 × 10
-5part;
Described nanometer silver is prepared from according to following steps:
A. sodium dodecyl sulfate solution, water polyacrylic acid and hydrazine hydrate solution are added in silver nitrate aqueous solution and obtain mixed solution, the mol ratio of described sodium laurylsulfonate and Silver Nitrate is 4-6:1; The mol ratio of described water polyacrylic acid and Silver Nitrate is 0.4-0.6:1; ; The mol ratio of described hydrazine hydrate and Silver Nitrate is 0.2-0.3:1;
B. in described mixed solution, add crown ether and sodium-metaphosphate, the mol ratio of described crown ether and Silver Nitrate is 3-5:1; The mol ratio of described sodium-metaphosphate and Silver Nitrate is 0.8-1.3:1, and control ph is 8-9, obtains nanometer silver.
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| CN117162638A (en) * | 2023-11-02 | 2023-12-05 | 山东森荣新材料股份有限公司 | Preparation method of expanded polytetrafluoroethylene composite heat-insulating film |
| CN117162638B (en) * | 2023-11-02 | 2023-12-29 | 山东森荣新材料股份有限公司 | Preparation method of expanded polytetrafluoroethylene composite heat-insulating film |
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