CN105064001A - Composite multi-curvature pore membrane material filled with silicon nitride particles as well as preparation method and application thereof - Google Patents
Composite multi-curvature pore membrane material filled with silicon nitride particles as well as preparation method and application thereof Download PDFInfo
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Abstract
The invention discloses a nano composite multi-curvature pore membrane material. According to the nano composite multi-curvature pore membrane material, a polyimide (PI) nano fiber non-woven fabric serves as a base material, and pores of the base material are filled with nano silicon nitride particles. The diameter of each nano silicon nitride particle is 50 to 100nm, and the nano silicon nitride particles account for 30 to 60 percent of the total weight of the nano composite multi-curvature pore membrane material; the thickness of the PI nano fiber non-woven fabric is 9 to 38 microns, and the porosity is 60 to 80 percent. The nano composite multi-curvature pore membrane material provided by the invention is resistant to high temperature, heat shrinkage, high voltage and high current impact, and mechanical impact, and is suitable for manufacturing various high-capacity and high-power lithium batteries or super-capacitors by serving as a safe battery membrane and a safe super-capacitor membrane. The invention also provides a preparation method of the nano composite multi-curvature pore membrane material, and application of the nano composite multi-curvature pore membrane material as a battery membrane.
Description
Technical field
The invention belongs to battery diaphragm field, relate to a kind of porous film material, be specifically related to a kind of containing Si
3n
4compound many curved hole membrane material of nano particle, and preparation method thereof and as the application of battery diaphragm.
Background technology
Lithium ion battery obtains as the electrokinetic cell of new-energy automobile and develops rapidly, will become the indispensable daily necessities of the mankind.But because the lithium battery diaphragm used at present belongs to the poor TPO porous film material of heat resistance, at relatively high temperatures, or when over-charging of battery cross put and mechanical damage, the hidden danger that smoldering easily appears in lithium ion battery, catch fire, even blast etc. jeopardizes user's safety.Therefore, the key of lithium ion battery in field application such as automobile powers is promoted in the security improving lithium ion battery.
For the safety in utilization of lithium battery, people utilize the high-fire resistance of PI material, develop a kind of electrospinning PI nanofiber battery diaphragm of high porosity.This high porosity PI nano fiber diaphragm does not shrink under 300 DEG C of high temperature, and have overcharging resisting cross put, the feature such as high rate capability and high cycle performance, the chemical property of lithium ion battery is obtained and increases substantially.But, because this electro spinning nano fiber barrier film is a kind of non-weaving cloth by fiber accumulations, there is too high porosity and excessive surface apertures, cause the spray charging precipitator of battery lower, often there is micro-short circuit phenomenon, especially when battery diaphragm thickness is lower, as lower than 30 microns, the probability that this situation occurs is quite high.Therefore, be necessary very much to create a kind of high temperature resistant highly secure lithium ion battery barrier film had compared with low porosity and less surface apertures newly.
Summary of the invention
An object of the present invention is: provide a kind of high safe many curved hole membrane material of heatproof had compared with low porosity and less surface apertures.
Two of object of the present invention is: the method providing the many curved hole membrane material described in preparation.
Three of object of the present invention is: provide the described application of many curved hole membrane material in battery diaphragm.
Above-mentioned purpose of the present invention is achieved through the following technical solutions:
First, provide a kind of nano combined many curved hole membrane material, it for base material, is filled with nano silicon nitride silicon grain with polyimides (PI) nano-fiber for production of non-woven in substrate pores; Described nano silicon nitride silicon grain, its diameter, between 50-100nm, accounts for the 30-60% of nano combined many curved hole membrane material gross weight; Described PI nano-fiber for production of non-woven thickness is between 9-38 μm, and porosity is between 60-80%.
In preferred embodiments of the present invention, described nano combined many curved hole membrane material porosity is between 30-50%, and surperficial average pore size is between 50-150nm, and thickness is between 10-40 μm.
The preferred nano combined many curved hole membrane material of the present invention, the PI nano-fiber for production of non-woven of the described preferred electrospinning of PI nano-fiber for production of non-woven.
The preferred nano combined many curved hole membrane material of the present invention, preferably by with the Si containing 15-30%wt
3n
4the water based suspension coating of nano particle or dipping PI nano-fiber for production of non-woven, make suspension permeate the hole filling up PI nano-fiber for production of non-woven, then obtain through 100-200 DEG C of hyperthermia drying.
Described water based suspension preferably further containing account for suspension gross weight 1.0% ~ 5.0% adhesive, account for the dispersant of suspension gross weight 0.1% ~ 1.0% and the water of surplus; More preferably account for the adhesive of suspension gross weight 1.5 ~ 2.0%, account for the dispersant of suspension gross weight 0.1% ~ 0.3% and the water of surplus.
Described adhesive optimization polypropylene esters of gallic acid adhesive, the more preferably different monooctyl ester copolymer of butylacrylate-acrylic acid.
Described dispersant optimization polypropylene acid ammonium.
The absolute viscosity of described water based suspension is preferably 10 ~ 30mPaS, is more preferably 19 ~ 28mPaS.
On this basis, the present invention also provides a kind of method preparing described nano combined many curved hole membrane material, is with low viscosity Si
3n
4nano particle water based suspension and PI nano-fiber for production of non-woven are raw material, permeated by surface application or dip coating infiltration method, by Si
3n
4nano particle is filled in the hole of PI nano-fiber for production of non-woven, after lower temperature is dried, is warming up to higher temperature and makes adhesive at Si
3n
4bond between nano particle and between particle and PI nanofiber.
The present invention preferably prepares the method for described nano combined many curved hole membrane material, specifically comprises the following steps:
1) water based suspension is prepared:
By weight percentage, by the Si of 15-30%
3n
4the water of the dispersant of nano particle, 0.1%-1.0%, the adhesive of 1.0-5.0% and surplus is mixed to get mixed liquor, by mixed liquor 8000-10000 turn/rotating speed of min is emulsified, forms the water based suspension of absolute viscosity at 10-30mPaS;
2) nano particle is filled:
By step 1) water based suspension prepared paves and forms certain thickness suspension liquid and membrane on level board, then PI nano-fiber for production of non-woven is covered in described suspension liquid and membrane, suspension infilters in PI nano-fiber for production of non-woven, treat that nano-fiber cloth upper strata drenches, uncover PI nano-fiber for production of non-woven;
3) dry molding bonded
By step 2) the PI nano-fiber for production of non-woven that obtains first at 80 ~ 100 DEG C heat dry 8 ~ 12min, then be warming up to 180 ~ 200 DEG C of heat treatment 3 ~ 6min, make Si
3n
4between nano particle and between they and PI nanofiber because of the melting of adhesive well-bonded formation nano combined many curved hole membrane material of the present invention.
The present invention preferably prepares in the method for described nano combined many curved hole membrane material, step 1) described in Si
3n
4nano particle accounts for the 15-21% of water based suspension weight.
The present invention preferably prepares in the method for described nano combined many curved hole membrane material, step 1) described in adhesive optimization polypropylene acid esters, the more preferably different monooctyl ester copolymer of butylacrylate-acrylic acid; Described dispersant optimization polypropylene acid ammonium.
The present invention preferably prepares in the method for described nano combined many curved hole membrane material, step 1) described in water based suspension absolute viscosity preferably at 19 ~ 28mPaS.
The present invention preferably prepares in the method for described nano combined many curved hole membrane material, step 2) described in the preferred thickness of PI nano-fiber for production of non-woven between 9-38 μm, the electrospinning PI nano-fiber for production of non-woven of porosity between 60-80%.
The present invention preferably prepares in the method for described nano combined many curved hole membrane material, step 3) preferably by step 2) the PI nano-fiber for production of non-woven that obtains first at 100 DEG C heat dry 10min, then be warming up to 200 DEG C of heat treatment 5min.
The present invention utilizes silicon nitride nano particles to have high temperature resistant, high rigidity and diameter is less than the characteristics such as the surface apertures of PI nano-fiber for production of non-woven, be filled in the hole of PI nano-fiber for production of non-woven, reduce the porosity of PI nano-fiber for production of non-woven and reduce its surface apertures, improve the electric breakdown strength of barrier film, improve the spray charging precipitator of battery and stop the short circuit phenomenon of battery; Improve the performance that battery diaphragm heat resistanceheat resistant is shunk simultaneously.
Preparation method of the present invention is with low viscosity nano Si
3n
4water based suspension and electrospinning PI nano-fiber for production of non-woven are raw material, permeated by surface application or dip coating infiltration method, by Si
3n
4nano particle is filled in the hole of PI nano-fiber for production of non-woven, after lower temperature is dried, is warming up to higher temperature and makes palyacrylate binder at Si
3n
4between nano particle and Si
3n
4the many curved hole membrane structure bonding the organic/inorganic nano compound forming more fine pore is carried out between particle and PI nanofiber.In the structure of gained film product, the nanofiber network structure for support effect in PI nano-fiber for production of non-woven, Si
3n
4nano particle plays a part fill and construct nanoaperture, thus give that this organic/inorganic nano compound many curved hole membrane material has good pore structure, surface apertures is little, duct is tortuous, electric breakdown strength is high, the characteristic such as high-fire resistance energy and very good mechanical properties, overcome the too high porosity of simple electrospinning PI nano-fiber for production of non-woven, excessive surface apertures and the electric breakdown strength deadly defect as safety battery barrier film such as on the low side.Therefore, many curved hole film of the present invention is a kind of membrane material being very suitable for being used as high temperature resistant high safety battery barrier film.
When the nano particle of Selective filling, present inventors studied Si
3n
4the usage ratio of nano particle for the impact of material property, if find Si
3n
4the consumption of nano particle in water based suspension lower than 15%, is then difficult to the hole of effectively filling PI fiber non-woven, causes the spray charging precipitator of battery lower, easily occurs micro-short circuit phenomenon; And if Si
3n
4nano particle consumption higher than 30%, then makes Granular composite become difficulty, hinders filling effect, be difficult to realize the pore structure that surface apertures is little, duct is tortuous, eventually pass through a large amount of experiments and obtain Si
3n
4the optimum amount scope of nano particle, makes the overall performance of compound many curved hole membrane material be issued to optimum in described optimum proportioning scope.When selecting adhesive and dispersant, the present inventor needs according to Si
3n
4the characteristic of nano particle and the needs of fill process carry out multifactorial comprehensive screening in multiple adhesive and dispersant, final discovery: polyacrylate adhesive, especially the different monooctyl ester copolymer of butylacrylate-acrylic acid, just right viscosity can be provided for composite aqueous suspension, for further apply infiltration and particle bond provide desirable basis; Adding of ammonium polyacrylate easilier compared with other dispersants forms electric double layer on nano grain surface, can play a significant role to the dispersion of ultrafine particle, slurry viscosity can be reduced, prevent particle agglomeration, make the organic and dispersion of inorganic nanoparticles in water based suspension reach ideal state.In addition, preparation method provided by the invention compares doctor blade process of the prior art and is more suitable for suitability for industrialized production.
Finally, Si of the present invention
3n
4nano combined many curved hole membrane material obtains following characteristic: thickness between 10-40 μm, porosity between 30-50%, surface apertures between 50-150nm, TENSILE STRENGTH between 30 ~ 50MPa, heat shrink temperature be greater than 350 DEG C, electric breakdown strength between 35-50V/ μm, ionic conductivity is in 1.0-8.0 × 10
-3scm
-1between.The nano composite membrane with this characteristic is high temperature resistant, heat resistanceheat resistant is shunk, high voltage withstanding and high rush of current, and resistance to mechanical is clashed into, and is suitable for being used as safety battery barrier film and safe diaphragm of supercapacitor, manufactures various high power capacity and high dynamic lithium battery or ultracapacitor.
The present invention also provides the described battery diaphragm of nano combined many curved hole membrane material as rechargeable nonaqueous electrolytic battery or the application of capacitor diaphragm.
Detailed description of the invention
Following examples will contribute to those of ordinary skill in the art and understand the present invention further, but not limit the present invention in any form.
embodiment 1:
A kind of containing Si
3n
4the composite film material of nano particle, it for base material, is filled with Si in substrate pores with electrospinning polyimides (PI) nano-fiber for production of non-woven
3n
4nano particle (Si
3n
4-NP);
Its preparation method is as follows:
(1) nano Si
3n
4water based suspension (Si
3n
4/ H
2o-1) configuration: 80.0 grams, nano-silicon nitride powder (diameter is mainly distributed in 30nm), ammonium polyacrylate 1.0 grams, the different monooctyl ester copolymer of butylacrylate-acrylic acid 8.0 grams, distilled water 300.0 grams, disposablely put into beaker, emulsified at the rotating speed of 8000 turns per minute, form the nano-silicon nitride water based suspension (Si that absolute viscosity is 28mPaS
3n
4/ H
2o-1).
(2) Si
3n
4the preparation of the nano combined high temperature resistant high safety battery barrier film of/PI: by Si configured above
3n
4/ H
2o-1 Silicon Nitride Suspensions is paved on a glass and is formed the suspension liquid and membrane that thickness is 30 μm, is then that the electrospinning PI nano-fiber for production of non-woven of 9 μm covers Si by thickness
3n
4/ H
2in O-1 suspension liquid and membrane, suspension infilters in PI nano-fiber for production of non-woven, treats that nano-fiber cloth upper strata drenches, show to be filled with suspension completely in the hole of non-weaving cloth, uncover PI nano-fiber for production of non-woven, at 100 DEG C, heat dries 10min, be warming up to 200 DEG C of heat treatment 5min, make Si
3n
4between nano particle and between nano particle and PI nanofiber by polyacrylate melting organic/inorganic nano combined many curved hole film of well-bonded formation.
(3) performance characterization: prepared Si
3n
4the thickness of the nano combined high temperature resistant high safety battery barrier film of/PI is 10 μm, TENSILE STRENGTH is 50MPa, elongation at break is 50%, puncture strength is 6.0N, percent thermal shrinkage at 350 DEG C is 0, the porosity of perforated membrane is 30%, surperficial average pore size is 50nm, gas permeability under 0.48bar pressure is 180S, electric breakdown strength is 50V/ μm, and ionic conductivity is 1.0 × 10
-3scm
-1
embodiment 2:
A kind of containing Si
3n
4the composite film material of nano particle, it for base material, is filled with Si in substrate pores with electrospinning polyimides (PI) nano-fiber for production of non-woven
3n
4nano particle (Si
3n
4-NP);
Its preparation method is as follows:
(1) nano Si
3n
4water based suspension (Si
3n
4/ H
2o-2) configuration: alpha-silicon nitride powders (diameter is mainly distributed in 100nm) 80.0 grams, ammonium polyacrylate 0.5 gram, the different monooctyl ester copolymer of butylacrylate-acrylic acid 8.0 grams, distilled water 433.0 grams, disposablely put into beaker, emulsified at the rotating speed of 8000 turns per minute, form the nano-silicon nitride water based suspension (Si that absolute viscosity is 19mPaS
3n
4/ H
2o-2).
(2) Si
3n
4the preparation of/PI micro-nano complex fire resistant height safety battery barrier film: by Si configured above
3n
4/ H
2o-2 Silicon Nitride Suspensions is paved on a glass and is formed the suspension liquid and membrane that thickness is 60 μm, is then that the electrospinning PI nano-fiber for production of non-woven of 38 μm covers Si by thickness
3n
4/ H
2in O-2 suspension liquid and membrane, suspension infilters in PI nano-fiber for production of non-woven, treats that nano-fiber cloth upper strata drenches, show to be filled with suspension completely in the hole of non-weaving cloth, uncover PI nano-fiber for production of non-woven, at 100 DEG C, heat dries 10min, be warming up to 200 DEG C of heat treatment 3min, make Si
3n
4between nano particle and between submicron particles and PI nanofiber by polyacrylate melting organic/inorganic nano combined many curved hole film of well-bonded formation.
(3) performance characterization: prepared Si
3n
4the nano combined high temperature resistant high safety battery of/PI every film thickness be 40 μm, TENSILE STRENGTH is 35MPa, elongation at break is 30%, puncture strength is 12.0N, percent thermal shrinkage at 350 DEG C is 0, the porosity of perforated membrane is 50%, surperficial average pore size is 150nm, gas permeability under 0.12bar pressure is 85S, electric breakdown strength is 35V/ μm, ionic conductivity is 8.0 × 10
-3scm
-1.
embodiment 3:
A kind of containing Si
3n
4the composite film material of nano particle, it for base material, is filled with Si in substrate pores with electrospinning polyimides (PI) nano-fiber for production of non-woven
3n
4nano particle (Si
3n
4-NP);
Its preparation method is as follows:
(1) nano Si
3n
4water based suspension (Si
3n
4/ H
2o-3) configuration: alpha-silicon nitride powders (diameter is mainly distributed in 50nm) 80.0 grams, ammonium polyacrylate 0.7 gram, the different monooctyl ester copolymer of butylacrylate-acrylic acid 8.0 grams, distilled water 300.0 grams, disposablely put into beaker, emulsified at the rotating speed of 8000 turns per minute, form the micron Silicon Nitride Suspensions (Si that absolute viscosity is 24mPaS
3n
4/ H
2o-3).
(2) Si
3n
4the preparation of the nano combined high temperature resistant high safety battery barrier film of/PI: by Si configured above
3n
4/ H
2o-3 Silicon Nitride Suspensions is paved on a glass and is formed the suspension liquid and membrane that thickness is 50 μm, is then that the electrospinning PI nano-fiber for production of non-woven of 24 μm covers Si by thickness
3n
4/ H
2in O-3 suspension liquid and membrane, suspension infilters in PI nano-fiber for production of non-woven, treats that nano-fiber cloth upper strata drenches, show to be filled with suspension completely in the hole of non-weaving cloth, uncover PI nano-fiber for production of non-woven, at 100 DEG C, heat dries 10min, be warming up to 200 DEG C of heat treatment 3min, make Si
3n
4between nano particle and between nano particle and PI nanofiber by polyacrylate melting organic/inorganic nano combined many curved hole film of well-bonded formation.
(3) performance characterization: prepared Si
3n
4the nano combined high temperature resistant high safety battery of/PI every film thickness be 25 μm, TENSILE STRENGTH is 45MPa, elongation at break is 38%, puncture strength is 10.0N, percent thermal shrinkage at 350 DEG C is 0, the porosity of perforated membrane is 40%, surperficial average pore size is 68nm, gas permeability under 0.48bar pressure is 15S, electric breakdown strength is 50V/ μm, ionic conductivity is 3.0 × 10
-3scm
-1.
embodiment 4:
A kind of containing Si
3n
4the composite film material of nano particle, it for base material, is filled with Si in substrate pores with electrospinning polyimides (PI) nano-fiber for production of non-woven
3n
4nano particle (Si
3n
4-NP);
Its preparation method is as follows:
(1) nano Si
3n
4water based suspension (Si
3n
4/ H
2o-4) configure: alpha-silicon nitride powders (diameter is mainly distributed in 80nm) 80.0 grams, ammonium polyacrylate 0.6 gram, the different monooctyl ester copolymer of butylacrylate-acrylic acid 8.0 grams, distilled water 433.0 grams, disposablely put into beaker, emulsified at the rotating speed of 8000 turns per minute, form the nano-silicon nitride water based suspension (Si that absolute viscosity is 20mPaS
3n
4/ H
2o-4).
(2) Si
3n
4the preparation of the nano combined high temperature resistant high safety battery barrier film of/PI: by Si configured above
3n
4/ H
2o-4 Silicon Nitride Suspensions is paved on a glass and is formed the suspension liquid and membrane that thickness is 30 μm, is then that the electrospinning PI nano-fiber for production of non-woven of 14 μm covers Si by thickness
3n
4/ H
2in O-4 suspension liquid and membrane, suspension infilters in PI nano-fiber for production of non-woven, treats that nano-fiber cloth upper strata drenches, show to be filled with suspension completely in the hole of non-weaving cloth, uncover PI nano-fiber for production of non-woven, at 100 DEG C, heat dries 10min, be warming up to 200 DEG C of heat treatment 5min, make Si
3n
4between nano particle and between nano particle and PI nanofiber by polyacrylate melting organic/inorganic nano combined many curved hole film of well-bonded formation.
(3) performance characterization: prepared Si
3n
4the thickness of the nano combined high temperature resistant high safety battery barrier film of/PI is 15 μm, TENSILE STRENGTH is 48MPa, elongation at break is 37%, puncture strength is 7.5N, percent thermal shrinkage at 350 DEG C is 0, the porosity of perforated membrane is 40%, surperficial average pore size is 120nm, gas permeability under 0.24bar pressure is 100S, electric breakdown strength is 48V/ μm, ionic conductivity is 6.2 × 10
-3scm
-1.Above experiment material and result testing equipment illustrate:
(1) experiment material:
Inorganic micro-nano powder, PI nano-fiber for production of non-woven, macromolecule dispersing agent and the polymer binder etc. that use in 4 experiment embodiments of the present invention are all bought by commercial channel and are obtained.
1) silicon nitride nanopowder, purchased from Shandong Jing Xin crystal Science and Technology Ltd., Beijing Deco Dao Jin Science and Technology Ltd.;
2) electrospinning polyimide nano-fiber non-weaving cloth, is produced by Jiangxi Xiancai Nano Fiber Technology Co., Ltd.;
3) ammonium polyacrylate, purchased from Shandong Zibo capital and dye chemical industry Co., Ltd;
(2) experimental result testing and characterization
In the present invention, the experimental result of 4 experiment embodiments is tested routinely by following instrument and equipment and characterizes.
1) polymer solution and spinning solution absolute viscosity NDJ-8S viscosimeter (Shanghai precision scientific instrument company) measure;
2) diameter of electro spinning nano fiber measures with scanning electronic microscope VEGA3SBU (Czech Republic);
3) Si
3n
4heat decomposition temperature WRT-3P thermal gravimetric analyzer (TGA) (Shanghai Precision Scientific Apparatus Co., Ltd) of the nano combined high temperature resistant high safety battery barrier film of/PI measures;
4) Si
3n
4the engineering properties (intensity, extension at break etc.) of the nano combined high temperature resistant high safety battery barrier film of/PI measures with the miniature control electronic universal tester of CMT8102 (Shenzhen SANS material tests Co., Ltd);
5) Si
3n
4the vitrification point of the nano combined high temperature resistant high safety battery barrier film of/PI uses Diamond Dynamic Mechanical Analyzer (DMA) (Perkin-Elmer, the U.S.) to measure;
6) Si
3n
4the porosity of the nano combined high temperature resistant high safety battery barrier film of/PI is calculated by following formula:
Porosity β=[1-(ρ/ρ o)] × 100
Wherein ρ is Si
3n
4the density of/PI nano compound stephanoporate film (gram/cm
3), ρ o is Si
3n
4the density of the nano combined solid film of/PI (being prepared by solution casting method) (gram/cm
3);
7) Si
3n
4the gas permeability of the nano combined high temperature resistant high safety battery barrier film of/PI and surface apertures use the Porometer3G air permeability tester of the U.S. to measure;
8) Si
3n
4the ionic conductivity of the nano combined high temperature resistant high safety battery barrier film of/PI uses electrochemical workstation CHI660D (morning China's instrument, Chinese Shanghai) to measure;
9) Si
3n
4the electric breakdown strength of the nano combined high temperature resistant high safety battery barrier film of/PI measures with the ZHZ8 type Hi-pot Tester of Shanghai Heng Mei Electric Applicance Co., Ltd.
Claims (10)
1. nano combined many curved hole membrane material, is characterized in that: it for base material, is filled with nano-silicon nitride (Si with polyimides (PI) nano-fiber for production of non-woven in substrate pores
3n
4) particle; Described nano Si
3n
4particle, its diameter, between 50-100nm, accounts for the 30-60% of nano combined many curved hole membrane material gross weight; Described PI nano-fiber for production of non-woven thickness is between 9-38 μm, and porosity is between 60-80%.
2. material according to claim 1, is characterized in that: described nano combined many curved hole membrane material, and its porosity is between 30-50%, and surperficial average pore size is between 50-150nm, and thickness is between 10-40 μm.
3. material according to claim 1, is characterized in that: by with the Si containing 15-30%wt
3n
4the water based suspension coating of nano particle or dipping PI nano-fiber for production of non-woven, make suspension permeate the hole filling up PI nano-fiber for production of non-woven, then obtain through 100-200 DEG C of hyperthermia drying.
4. material according to claim 3, is characterized in that: further containing account for suspension gross weight 1.0% ~ 5.0% adhesive, account for the dispersant of suspension gross weight 0.1% ~ 1.0% and the water of surplus.
5. material according to claim 4, is characterized in that: described adhesive is selected from polyacrylate adhesive, the different monooctyl ester copolymer of preferred butylacrylate-acrylic acid; Described dispersant is ammonium polyacrylate.
6. material according to claim 4, is characterized in that: the absolute viscosity of described water based suspension is 10 ~ 30mPaS, is preferably 19 ~ 28mPaS.
7. preparing a method for nano combined many curved hole membrane material according to claim 1, is with low viscosity Si
3n
4nano particle water based suspension and PI nano-fiber for production of non-woven are raw material, permeated by surface application or dip coating infiltration method, by Si
3n
4nano particle is filled in the hole of PI nano-fiber for production of non-woven, after lower temperature is dried, is warming up to higher temperature and makes adhesive at Si
3n
4bond between nano particle and between particle and PI nanofiber.
8. method according to claim 7, is characterized in that, specifically comprises the following steps:
1) water based suspension is prepared:
By weight percentage, by the Si of 15-30%
3n
4the water of the dispersant of nano particle, 0.1%-1.0%, the adhesive of 1.0-5.0% and surplus is mixed to get mixed liquor, by mixed liquor 8000-10000 turn/rotating speed of min is emulsified, forms the water based suspension of absolute viscosity at 10-30mPaS;
2) nano particle is filled:
By step 1) water based suspension prepared paves and forms certain thickness suspension liquid and membrane on level board, then PI nano-fiber for production of non-woven is covered in described suspension liquid and membrane, suspension infilters in PI nano-fiber for production of non-woven, treat that nano-fiber cloth upper strata drenches, uncover PI nano-fiber for production of non-woven;
3) dry molding bonded
By step 2) the PI nano-fiber for production of non-woven that obtains first at 80 ~ 100 DEG C heat dry 8 ~ 12min, then be warming up to 180 ~ 200 DEG C of heat treatment 3 ~ 6min, make Si
3n
4between nano particle and between they and PI nanofiber because of the melting of adhesive well-bonded formation nano combined many curved hole membrane material of the present invention.
9. method according to claim 8, is characterized in that: step 1) described in adhesive be polyacrylate, the different monooctyl ester copolymer of preferred butylacrylate-acrylic acid; Described dispersant is ammonium polyacrylate.
10. method according to claim 8, is characterized in that: be rapid 3) by step 2) the PI nano-fiber for production of non-woven that obtains first at 100 DEG C heat dry 10min, then be warming up to 200 DEG C of heat treatment 5min.
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|---|---|---|---|
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