Background technology
Titanium dioxide (TiO
2) be a kind of important inorganic semiconductor functional material, there is the characteristics such as wet sensitive, air-sensitive, dielectric effect, photoelectric conversion and superior photocatalysis performance, have important application prospect in high-tech areas such as sensor, dielectric material, self-cleaning material, solar cell, photocatalytic pollutant degradation.
Nano titanium oxide has very strong " super-hydrophobicity ", not easily forms the globule on its surface, and nano titanium oxide under visible light illumination can to hydrocarbon effect.Utilize a feature like this can be coated with last layer nano titanium oxide thin layer on the surface of glass, pottery and ceramic tile, utilize the light-catalyzed reaction of titanium oxide just the organic pollution being adsorbed on titania surface can be decomposed into CO
2and O
2, together can be clean by rain drop erosion with remaining inorganic matter, thus realize self-cleaning function.Tokyo has people at laboratory development success self-cleaning ceramic tile, the surface of this new product there is skim nano titanium oxide, any pickup material from the teeth outwards, comprise greasy dirt, bacterium under the irradiation of light, due to the catalytic action of nano titanium oxide, these hydrocarbon materials can be made to be oxidized further and to become gas or be easy to by the material wiped.Nano titanium dioxide photocatalysis effect makes all become easy keeping a public place clean etc. of the ceramic tile of the glass of skyscraper, the easy pickup in kitchen, automobile rearview mirror and front screen.
Fluting medium generally prepares ground wood pulp or semi-chemical pulp manufacture with leaf wood, all better in the physical strengths such as deflection, ring crush intensity, TENSILE STRENGTH, bursting strength, tear-resistant degree, and the bulk of paper is better.
More botanic plant surfaces are as lotus leaf, paddy rice, rose, and the special hydrophobic effect of the special surface such as skin, claw to water droplet of some animals itself.This special surface texture can make plant surface keep the automatically cleaning on blade face, extend the time of staying of water droplet at plant surface, and expand the contact area of animal and water, thus animal capable is stopped at the water surface safely, and slow down the resistance of water in animal movement.Hydrophobicity refers to a molecule (hydrophobe) physical property mutually exclusive with water.Hydrophobic molecule is partial to nonpolar, and therefore comparatively can be dissolved in neutral and non-polar solution (as organic solution).The wettability of the surface of solids can be weighed with contact angle.When judging a surperficial hydrophobic effect in addition, also should consider its dynamic process, generally weigh by roll angle.
Detailed description of the invention
Utilize corrugated paper/nano titanium oxide to prepare a method for nano-sized hydrophobic paper, it is characterized in that the method comprises: (1) Chemical Pretreatment; (2) mechanical treatment obtains nano-cellulose; (3) super-hydrophobic nano paper is prepared.
Nanofiber process prepared by the described corrugated paper that utilizes, and it is characterized in that described Chemical Pretreatment comprises, 1) take 10g corrugated paper, with smashing with mixer after distilled water immersion 1h and filtering, be settled to 500ml; 2) take the NaOH 10g that mass concentration is 2%, process 2 ~ 4 h when temperature 90 DEG C, under room temperature after cooling; 3) wash with distilled water until neutral; 4) take the sodium chlorite of 4.5g and measure the glacial acetic acid of 4ml, processing three times when temperature is 75 DEG C, each one hour, then leaving standstill in room temperature cooling; 5) wash with distilled water until neutral; Take the potassium hydroxide 10g that mass concentration is 2%, process 2 ~ 4 h when temperature is 90 DEG C, then under room temperature, cooling leaves standstill; 6) wash until neutral with distilled water.Take the sodium chlorite of 4.5g and measure the glacial acetic acid of 4ml, processing one hour when temperature is 75 DEG C, then leaving standstill and be cooled to room temperature; 7) wash until neutral with distilled water.Take the potassium hydroxide 5g of 1%, process 2 ~ 4 h when temperature is 90 DEG C, wash with distilled water until neutral after cooling; 8) measure with graduated cylinder the hydrochloric acid 14ml that mass concentration is 36%, process 2 ~ 4 h when temperature is 80 DEG C, wash until neutrality obtains corrugation paper pulp with distilled water after cooling.
The described method utilizing corrugated paper to prepare nanofiber, is characterized in that described mechanical treatment is 1) chemical treatment be washed till neutral corrugation paper pulp 500ml of learning from else's experience; 2) grind 20 times on grinder, each 40min; 3) ultrasonic process, the solution being settled to 500ml is got 50ml and be diluted to 250ml and carry out ultrasonic process 40min, power is 1000W, obtained nano-cellulose.
A kind of described method utilizing corrugated paper/nano titanium oxide to prepare nano-sized hydrophobic paper, it is characterized in that described preparing super-hydrophobic nano paper, concrete steps comprise:
(1) by silane coupler grafted nano titanium oxide in the system of alcohol: 1) take titanium dioxide nanoparticle 5 grams, be dissolved in the system of 108 ml ethanols and 3 ml deionized water, magnetic agitation 5 ~ 10 minutes; 2) dripping 1.52 grams of concentration is the ammonia spirit of 25wt% and the silane coupler of 1.8g, mixed solution strong stirring 1 hour at normal temperatures; 3) solution by distilled water or ammoniacal liquor centrifugal in absolute ethyl alcohol system, purifying from silane coupler; 4) purifying, centrifugal is repeated repeatedly, until do not have silane coupler in ethanol system; 5) through air dry in 24 hours, the titanium dioxide nanoparticle of graft modification is obtained.
(2) nano titanium oxide hydrophobic paper is prepared: comprise 1) get the nanofiber cellulose solution of preparation, adding the titanium dioxide nanoparticle of difference amount after silane coupler modified to nanofiber cellulose solution, is carry out high speed machine mixing under the speed of 30000 revs/min at rotating speed; 2) by ultrasonic for the nanofiber cellulose solution after process, it is made fully to dissolve and stir; 3) adopt vacuum filtration machine to carry out vacuum filtration, namely obtain nano titanium oxide hydrophobic paper, flatten with clean glass plate, and be positioned over dry 48h in 60 degrees Celsius of baking ovens, afterwards dried film is placed on valve bag and seals up for safekeeping.
Embodiment 1
Utilize corrugated paper to prepare nanofiber process to be: Chemical Pretreatment comprises, 1) take 10g corrugated paper, with smashing with mixer after distilled water immersion 1h and filtering, be settled to 500ml; 2) take the NaOH 10g that mass concentration is 2%, process 2 ~ 4 h when temperature 90 DEG C, under room temperature after cooling; 3) wash with distilled water until neutral; 4) take the sodium chlorite of 4.5g and measure the glacial acetic acid of 4ml, processing three times when temperature is 75 DEG C, each one hour, then leaving standstill in room temperature cooling; 5) wash with distilled water until neutral; Take the potassium hydroxide 10g that mass concentration is 2%, process 2 ~ 4 h when temperature is 90 DEG C, then under room temperature, cooling leaves standstill; 6) wash until neutral with distilled water.Take the sodium chlorite of 4.5g and measure the glacial acetic acid of 4ml, processing one hour when temperature is 75 DEG C, then leaving standstill and be cooled to room temperature; 7) wash until neutral with distilled water.Take the potassium hydroxide 5g of 1%, process 2 ~ 4 h when temperature is 90 DEG C, wash with distilled water until neutral after cooling; 8) measure with graduated cylinder the hydrochloric acid 14ml that mass concentration is 36%, process 2 ~ 4 h when temperature is 80 DEG C, wash until neutrality obtains corrugation paper pulp with distilled water after cooling.
The mechanical treatment that corrugated paper is prepared in the method for nanofiber is: the chemical treatment be washed till neutral corrugation paper pulp 500ml of 1) learning from else's experience; 2) grind 20 times on grinder, each 40min; 3) ultrasonic process, the solution being settled to 500ml is got 50ml and be diluted to 250ml and carry out ultrasonic process 40min, power is 1000W, obtained nano-cellulose.
The handling process that the present embodiment corrugated paper is prepared into nanofiber is shown in Fig. 1.
Embodiment 2
Prepare nano titanium oxide hydrophobic paper: the nanofiber cellulose solution 1) getting preparation, be that 10% titanium dioxide after silane coupler modified adds nanofiber cellulose solution to by concentration, carry out high speed machine mixing 20min transferring under the speed of 25000 revs/min; 2) by ultrasonic for the solution after process, it is made fully to dissolve and stir; 3) solution prepared adopts vacuum filtration machine to carry out vacuum filtration, namely obtains nano titanium oxide hydrophobic paper, flattens, and is positioned over dry 48h in 60 DEG C of baking ovens, afterwards dried film is placed on valve bag and seals up for safekeeping with clean glass plate.
Embodiment 3
Preparing nano titanium oxide hydrophobic paper: the nanofiber cellulose solution 1) getting preparation, is that 20% titanium dioxide after silane coupler modified adds nanofiber cellulose solution to by concentration, carries out high speed machine mixing transferring under the speed of 30000 revs/min; 2) by ultrasonic for the solution after process, it is made fully to dissolve and stir; 3) solution prepared adopts vacuum filtration machine to carry out vacuum filtration, namely obtains nano titanium oxide hydrophobic paper, flattens, and is positioned over dry 48h in 60 DEG C of baking ovens, afterwards dried film is placed on valve bag and seals up for safekeeping with clean glass plate.
Embodiment 4
Hydrophobicity is tested: in nanofiber solution, add the nano titanium oxide that concentration is 10%, the hydrophobicity on test nanometer paper surface.First comparatively smooth film is cut into the test sample of specification 4 × 4cm, on sample, drips a deionized water with small-sized syringe, carry out taking pictures, recording and measure contact angle with contact angle instrument simultaneously.
Embodiment 5
Hydrophobicity is tested: in nanofiber solution, add the nano titanium oxide that concentration is 20%, the hydrophobicity on test nanometer paper surface.First comparatively smooth film is cut into the test sample of specification 4 × 4cm, on sample, drips a deionized water with small-sized syringe, carry out taking pictures, recording and measure contact angle with contact angle instrument simultaneously.
Embodiment 6
Light transmittance: titanium dioxide concentration is the light transmittance of the cellulose nano thin-film that 10% process obtains afterwards, in visible wavelengths scope (400-800nm), the wavelength of conventional light transmittance chooses 600nm place as benchmark.The pure nano-cellulose film light transmittance recorded at 600nm place is 80%, after adding titanium dioxide in cellulose solution, titanium dioxide concentration be 10% nano-cellulose film light transmittance be 65%.
Embodiment 7
Tensile property: pure nano-cellulose film TENSILE STRENGTH and elastic modelling quantity are respectively 74.16MPa and 2.17GPa; Titanium dioxide concentration be 10% nano-cellulose film TENSILE STRENGTH and elastic modelling quantity be respectively 63.18MPa and 3.53GPa, titanium dioxide concentration be 20% nano-cellulose film TENSILE STRENGTH and elastic modelling quantity be respectively 50.48MPa, 2.63GPa,
Above-mentioned detailed description of the invention is exemplary, is to can better understand content of the present invention, should not be understood as limiting the scope of the invention, as long as the improvement done according to technical solution of the present invention, all falling into protection scope of the present invention.