CN111151124A - Nano-plate with catalytic and conductive functions and preparation method and application thereof - Google Patents
Nano-plate with catalytic and conductive functions and preparation method and application thereof Download PDFInfo
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- CN111151124A CN111151124A CN202010025959.6A CN202010025959A CN111151124A CN 111151124 A CN111151124 A CN 111151124A CN 202010025959 A CN202010025959 A CN 202010025959A CN 111151124 A CN111151124 A CN 111151124A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/864—Removing carbon monoxide or hydrocarbons
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/48—Silver or gold
- B01J23/52—Gold
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
- B01J31/02—Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides
- B01J31/06—Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides containing polymers
Abstract
The invention belongs to the field of composite materials, and particularly relates to a nano plate with a catalytic and conductive function, and a preparation method and application thereof. The nano-plate provided by the invention comprises a nano-heat insulation plate blank and a nano-coating compounded on the surface of the nano-heat insulation plate blank; the nano coating is formed by drying a nano coating, and the nano coating comprises the following components in parts by weight: 30-50 parts of nanogold; 10-20 parts of nano platinum; 0-10 parts of graphene; 0.1-0.5 part of a dispersing agent; 1-3 parts of montmorillonite; 30-50 parts of water; the dispersant is polyacrylic acid-polyoxyethylene comb polymer. The nano-coating is arranged on the surface of the nano-insulation board blank, contains nano-gold, nano-platinum, graphene and other components, and has an excellent catalytic and conductive function. The nano plate provided by the invention has excellent heat insulation function and catalytic conduction function, and has wide application prospect in the fields of automobile tail gas purification, fuel cells, photo-thermal power generation systems and the like.
Description
Technical Field
The invention belongs to the field of composite materials, and particularly relates to a nano plate with a catalytic and conductive function, and a preparation method and application thereof.
Background
The existing nanometer microporous thermal insulation board is mainly made by adopting silicon dioxide nanometer powder as a main material and inorganic fiber materials such as glass fiber, aluminum silicate ceramic fiber and the like as reinforcing materials and adopting a compression molding process. Although the nano microporous thermal insulation board has good thermal insulation effect and low thermal conductivity, the nano microporous thermal insulation board does not have the catalytic and electric conduction functions.
Chinese patent CN 106735300 a discloses a method for synthesizing an ultra-thin silver nano-plate, which comprises the following steps: preparing a seed crystal solution with highly uniform seed crystal types by adding a large amount of excess hydrogen peroxide and a strong reducing agent into a mixed solution of silver nitrate and a surfactant; utilizing a seed crystal solution to obtain a first silver nano plate with controllable appearance and size and monodispersity by controlling the amount of a reducing agent and silver nitrate in the reaction process; obtaining a second silver nano plate with random 'gaps' and 'hot spots' through multi-cycle growth; by introducing halogen ions/hydrogen peroxide etching defects, a third silver nano plate with a smooth edge, an ultrahigh length-diameter ratio, an overlarge length-diameter ratio and an ultrathin thickness is obtained through multi-cycle growth; and the ultrathin silver nano plate with the core-shell structure is obtained by wrapping the three nano plates with unique structures. The ultrathin silver nano plate prepared by the patent has excellent catalytic and conductive functions, but does not have a heat insulation function.
It can be seen that the existing nano-sheet is difficult to have both heat insulation function and catalytic conductive function, so that the application occasions requiring good heat insulation effect and catalytic or conductive function are not satisfied, such as: automobile exhaust processing system, fuel cell, light and heat power generation system, etc.
Disclosure of Invention
In view of the above, the present invention aims to provide a nano-plate with catalytic and conductive functions, and a preparation method and an application thereof, and the nano-plate provided by the present invention has both thermal insulation and catalytic and conductive functions, can perform catalytic purification on harmful gas in a heated state, and has a wide application prospect in the fields of automobile exhaust purification, fuel cells, photo-thermal power generation systems, etc.
The invention provides a nano plate with a catalytic and conductive function, which comprises a nano heat insulation plate blank and a nano coating compounded on the surface of the nano heat insulation plate blank;
the nano coating is formed by drying a nano coating, and the nano coating comprises the following components in parts by weight:
the dispersant is polyacrylic acid-polyoxyethylene comb polymer.
Preferably, the thickness of the nano coating is 0.1-0.5 mm.
Preferably, the nano thermal insulation board blank comprises the following components in parts by weight:
50-80 parts of nano silicon dioxide;
2-10 parts of inorganic fiber material;
10-30 parts of an infrared opacifier.
Preferably, the inorganic fiber material comprises one or more of high silica fibers, polycrystalline alumina fibers, alumina silicate ceramic fibers, and glass fiber chopped strands.
Preferably, the infrared opacifier comprises one or more of micron-sized silicon carbide powder, micron-sized zirconium silicate powder and micron-sized rutile powder.
The invention provides a preparation method of a nano plate with a catalytic and conductive function, which comprises the following steps:
coating a nano coating on the surface of the nano heat insulation plate blank, and drying to obtain a nano plate with a catalytic and conductive function;
the nano coating comprises the following components in parts by weight:
the dispersant is polyacrylic acid-polyoxyethylene comb polymer.
Preferably, the coating is carried out by spraying, brushing or rolling.
Preferably, the drying temperature is 100-120 ℃; the drying time is 1-5 h.
Preferably, the nano heat insulation plate blank is prepared according to the following steps:
mixing the nano silicon dioxide, the inorganic fiber material and the infrared opacifier, and performing dry pressing to obtain a nano heat insulation board blank.
The nano plate in the technical scheme or the nano plate prepared by the method in the technical scheme is applied to catalytic purification of harmful gases.
Compared with the prior art, the invention provides a nano-plate with a catalytic and conductive function, and a preparation method and application thereof. The nano-plate provided by the invention comprises a nano-heat insulation plate blank and a nano-coating compounded on the surface of the nano-heat insulation plate blank; the nano coating is formed by drying a nano coating, and the nano coating comprises the following components in parts by weight: 30-50 parts of nanogold; 10-20 parts of nano platinum; 0-10 parts of graphene; 0.1-0.5 part of a dispersing agent; 1-3 parts of montmorillonite; 30-50 parts of water; the dispersant is polyacrylic acid-polyoxyethylene comb polymer. The nano-coating is arranged on the surface of the nano-insulation board blank, contains nano-gold, nano-platinum, graphene and other components, and has an excellent catalytic and conductive function. The nano plate provided by the invention has excellent heat insulation function and catalytic conduction function, can be used for catalytic purification of harmful gases such as oxycarbide, hydrocarbon, carbonitride and the like in a heated state, and has wide application prospects in the fields of automobile exhaust purification, fuel cells, photo-thermal power generation systems and the like. The experimental results show that: the surface resistance of the nano plate provided by the invention is less than 200 omega, and the catalytic conversion rate of CO is more than 95%.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a nano plate with a catalytic and conductive function, which comprises a nano heat insulation plate blank and a nano coating compounded on the surface of the nano heat insulation plate blank;
the nano coating is formed by drying a nano coating, and the nano coating comprises the following components in parts by weight:
the dispersant is polyacrylic acid-polyoxyethylene comb polymer.
The nano-plate provided by the invention comprises a nano-insulation plate blank and a nano-coating. Wherein, the components of the nano heat insulation board blank preferably comprise nano silicon dioxide, inorganic fiber materials and infrared opacifiers. In the invention, the particle size of the nano silicon dioxide is preferably 10-30 nm, and specifically can be 10nm, 11nm, 12nm, 13nm, 14nm, 15nm, 16nm, 17nm, 18nm, 19nm, 20nm, 21nm, 22nm, 23nm, 24nm, 25nm, 26nm, 27nm, 28nm, 29nm or 30 nm; the content of the nano-silica in the nano-insulation board blank is preferably 50 to 80 parts by weight, and specifically may be 50 parts by weight, 51 parts by weight, 52 parts by weight, 53 parts by weight, 54 parts by weight, 55 parts by weight, 56 parts by weight, 57 parts by weight, 58 parts by weight, 59 parts by weight, 60 parts by weight, 61 parts by weight, 62 parts by weight, 63 parts by weight, 64 parts by weight, 65 parts by weight, 66 parts by weight, 67 parts by weight, 68 parts by weight, 69 parts by weight, 70 parts by weight, 71 parts by weight, 72 parts by weight, 73 parts by weight, 74 parts by weight, 75 parts by weight, 76 parts by weight, 77 parts by weight, 78 parts by weight, 79 parts by weight, or 80 parts by weight.
In the present invention, the inorganic fiber material preferably includes one or more of high silica fiber, polycrystalline alumina fiber, alumina silicate ceramic fiber, and glass fiber chopped yarn, more preferably alumina silicate ceramic fiber. Wherein, the aluminosilicate ceramic fiber is preferably aluminosilicate ceramic fiber of type 1140 (with the limiting temperature of 1140 ℃); the length of the aluminum silicate ceramic fiber is preferably 5-8 mm, and specifically can be 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm or 8 mm; the diameter of the aluminum silicate ceramic fiber is preferably 2.8-3.8 μm, and specifically can be 2.8 μm, 2.9 μm, 3 μm, 3.1 μm, 3.2 μm, 3.3 μm, 3.4 μm, 3.5 μm, 3.6 μm, 3.7 μm or 3.8 μm. In the invention, the content of the inorganic fiber material in the nano heat insulation board blank is 2 to 10 parts by weight, specifically 2 parts by weight, 2.5 parts by weight, 3 parts by weight, 3.5 parts by weight, 4 parts by weight, 4.5 parts by weight, 5 parts by weight, 5.5 parts by weight, 6 parts by weight, 6.5 parts by weight, 7 parts by weight, 7.5 parts by weight, 8 parts by weight, 8.5 parts by weight, 9 parts by weight, 9.5 parts by weight or 10 parts by weight, based on 50 to 80 parts by weight of the nano silicon dioxide in the nano heat insulation board blank.
In the present invention, the infrared opacifier preferably includes one or more of micron-sized silicon carbide powder, micron-sized zirconium silicate powder and micron-sized rutile powder; the particle size of the infrared light-shading agent is preferably 2-5 μm, and specifically may be 2 μm, 2.1 μm, 2.2 μm, 2.3 μm, 2.4 μm, 2.5 μm, 2.6 μm, 2.7 μm, 2.8 μm, 2.9 μm, 3 μm, 3.1 μm, 3.2 μm, 3.3 μm, 3.4 μm, 3.5 μm, 3.6 μm, 3.7 μm, 3.8 μm, 3.9 μm, 4 μm, 4.1 μm, 4.2 μm, 4.3 μm, 4.4 μm, 4.5 μm, 4.6 μm, 4.7 μm, 4.8 μm, 4.9 μm or 5 μm. In the invention, the content of the infrared opacifier in the nano heat insulation board blank is 10 to 30 parts by weight, specifically 10 parts by weight, 11 parts by weight, 12 parts by weight, 13 parts by weight, 14 parts by weight, 15 parts by weight, 16 parts by weight, 17 parts by weight, 18 parts by weight, 19 parts by weight, 20 parts by weight, 21 parts by weight, 22 parts by weight, 23 parts by weight, 24 parts by weight, 25 parts by weight, 26 parts by weight, 27 parts by weight, 28 parts by weight, 29 parts by weight or 30 parts by weight, based on 50 to 80 parts by weight of the nano silicon dioxide in the nano heat insulation board blank.
In the invention, the nano coating is compounded on the surface of the nano heat insulation board blank and is formed by drying the nano coating. The nano coating comprises nano gold, nano platinum, graphene, a dispersing agent, montmorillonite and water. In the invention, the particle size of the nano gold is preferably 10-15 nm, and specifically can be 10nm, 10.5nm, 11nm, 11.5nm, 12nm, 12.5nm, 13nm, 13.5nm, 14nm, 14.5nm or 15 nm; the content of the nanogold in the nano coating is preferably 30 to 50 parts by weight, and specifically may be 30 parts by weight, 31 parts by weight, 32 parts by weight, 33 parts by weight, 34 parts by weight, 35 parts by weight, 36 parts by weight, 37 parts by weight, 38 parts by weight, 39 parts by weight, 40 parts by weight, 41 parts by weight, 42 parts by weight, 43 parts by weight, 44 parts by weight, 45 parts by weight, 46 parts by weight, 47 parts by weight, 48 parts by weight, 49 parts by weight or 50 parts by weight.
In the invention, the particle size of the nano platinum is preferably 4-8 nm, and specifically can be 4nm, 4.5nm, 5nm, 5.5nm, 6nm, 6.5nm, 7nm, 7.5nm or 8 nm. In the present invention, the content of the nano-platinum in the nano-coating is 10 to 20 parts by weight, specifically 10 parts by weight, 11 parts by weight, 12 parts by weight, 13 parts by weight, 14 parts by weight, 15 parts by weight, 16 parts by weight, 17 parts by weight, 18 parts by weight, 19 parts by weight or 20 parts by weight, based on 30 to 50 parts by weight of the nano-gold in the nano-coating.
In the present invention, the graphene may be single-layer graphene, double-layer graphene, and multilayer graphene within 15 layers; the particle size of the graphene is preferably 0.5-3 μm, and specifically may be 0.5 μm, 0.6 μm, 0.7 μm, 0.8 μm, 0.9 μm, 1 μm, 1.1 μm, 1.2 μm, 1.3 μm, 1.4 μm, 1.5 μm, 1.6 μm, 1.7 μm, 1.8 μm, 1.9 μm, 2 μm, 2.1 μm, 2.2 μm, 2.3 μm, 2.4 μm, 2.5 μm, 2.6 μm, 2.7 μm, 2.8 μm, 2.9 μm, or 3 μm. In the present invention, the content of the graphene in the nano coating is 0 to 10 parts by weight, specifically 0.5 part by weight, 1 part by weight, 2 parts by weight, 3 parts by weight, 4 parts by weight, 5 parts by weight, 6 parts by weight, 7 parts by weight, 8 parts by weight, 9 parts by weight, or 10 parts by weight, based on 30 to 50 parts by weight of the nanogold in the nano coating.
In the present invention, the dispersant is a polyacrylic acid-polyethylene oxide (PAA-PEO) comb polymer; the polymerization degree of the polyacrylic acid-polyethylene oxide (PAA-PEO) comb polymer is preferably 1700-2400, and specifically 1700, 1750, 1800, 1850, 1900, 1950, 2000, 2050, 2100, 2150, 2200, 2250, 2300, 2350 or 2400; the viscosity of a 1 wt% aqueous solution of the polyacrylic acid-polyethylene oxide (PAA-PEO) comb polymer at 25 ℃ is preferably 1200mPa.s or more. In the present invention, the content of the dispersant in the nano coating is 0.1 to 0.5 parts by weight, specifically 0.1 part by weight, 0.15 part by weight, 0.2 part by weight, 0.25 part by weight, 0.3 part by weight, 0.35 part by weight, 0.4 part by weight, 0.45 part by weight or 0.5 part by weight, based on 30 to 50 parts by weight of the nanogold in the nano coating.
In the present invention, the particle size of the montmorillonite is preferably 3 to 5 μm, and specifically may be 3 μm, 3.1 μm, 3.2 μm, 3.3 μm, 3.4 μm, 3.5 μm, 3.6 μm, 3.7 μm, 3.8 μm, 3.9 μm, 4 μm, 4.1 μm, 4.2 μm, 4.3 μm, 4.4 μm, 4.5 μm, 4.6 μm, 4.7 μm, 4.8 μm, 4.9 μm or 5 μm. In the present invention, the content of the montmorillonite in the nano coating is 1 to 3 parts by weight, specifically 1 part by weight, 1.1 part by weight, 1.2 parts by weight, 1.3 parts by weight, 1.4 parts by weight, 1.5 parts by weight, 1.6 parts by weight, 1.7 parts by weight, 1.8 parts by weight, 1.9 parts by weight, 2 parts by weight, 2.1 parts by weight, 2.2 parts by weight, 2.3 parts by weight, 2.4 parts by weight, 2.5 parts by weight, 2.6 parts by weight, 2.7 parts by weight, 2.8 parts by weight, 2.9 parts by weight, or 3 parts by weight, based on 30 to 50 parts by weight of the nanogold in the nano coating.
In the present invention, the content of the water in the nano coating is 30 to 50 parts by weight, specifically 30 parts by weight, 31 parts by weight, 32 parts by weight, 33 parts by weight, 34 parts by weight, 35 parts by weight, 36 parts by weight, 37 parts by weight, 38 parts by weight, 39 parts by weight, 40 parts by weight, 41 parts by weight, 42 parts by weight, 43 parts by weight, 44 parts by weight, 45 parts by weight, 46 parts by weight, 47 parts by weight, 48 parts by weight, 49 parts by weight or 50 parts by weight, based on 30 to 50 parts by weight of the nano gold in the nano coating.
In the present invention, the thickness of the nano-coating is preferably 0.1 to 0.5mm, and specifically may be 0.1mm, 0.11mm, 0.12mm, 0.13mm, 0.14mm, 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm, 0.2mm, 0.21mm, 0.22mm, 0.23mm, 0.24mm, 0.25mm, 0.26mm, 0.27mm, 0.28mm, 0.29mm, 0.3mm, 0.31mm, 0.32mm, 0.33mm, 0.34mm, 0.35mm, 0.36mm, 0.37mm, 0.38mm, 0.39mm, 0.4mm, 0.41mm, 0.42mm, 0.43mm, 0.44mm, 0.45mm, 0.46mm, 0.47mm, 0.48mm, 0.49mm, or 0.49 mm.
The invention also provides a preparation method of the nano plate with the catalytic and conductive functions, which comprises the following steps:
and coating the nano coating on the surface of the nano heat insulation plate blank, and drying to obtain the nano plate with the catalytic and conductive functions.
In the preparation method provided by the invention, firstly, the nano heat insulation board blank and the nano coating are respectively prepared. The nano heat insulation plate blank is preferably prepared according to the following steps:
mixing the nano silicon dioxide, the inorganic fiber material and the infrared opacifier, and performing dry pressing to obtain a nano heat insulation board blank. The related information and the dosage ratio of the nano silicon dioxide, the inorganic fiber material and the infrared opacifier are introduced in the above text, and are not described again; the specific process of mixing is preferably to mix the nano-silica and the inorganic fiber first and then mix the mixture with the infrared opacifier.
In the preparation method provided by the invention, the composition of the nano coating is introduced above and is not described again; the nano coating is preferably prepared according to the following steps:
firstly, mixing a dispersing agent with water, then mixing a dispersing agent water solution with graphene and montmorillonite, and finally mixing a mixed system with nano gold and nano platinum to obtain the nano coating. The mixing speed of the dispersing agent and water is preferably 200-400 rpm, and specifically can be 200 rpm, 250 rpm, 300 rpm, 350 rpm or 400 rpm; the mixing time of the dispersing agent and water is preferably 1-5 min, and specifically can be 1min, 1.5min, 2min, 2.5min, 3min, 3.5min, 4min, 4.5min or 5 min; the rotation speed of the mixture of the dispersant aqueous solution, the graphene and the montmorillonite is preferably 200-400 rpm, and specifically can be 200 rpm, 250 rpm, 300 rpm, 350 rpm or 400 rpm; the mixing time of the dispersant aqueous solution, the graphene and the montmorillonite is preferably 1-5 min, and specifically can be 1min, 1.5min, 2min, 2.5min, 3min, 3.5min, 4min, 4.5min or 5 min; the rotation speed of the mixing system, the nano gold and the nano platinum is preferably 500-700 rpm, and specifically can be 500 rpm, 550 rpm, 600 rpm, 650 rpm or 700 rpm; the mixing time of the mixed system, the nano gold and the nano platinum is preferably 5-10 min, and specifically can be 5min, 5.5min, 6min, 6.5min, 7min, 7.5min, 8min, 8.5min, 9min, 9.5min or 10 min.
In the preparation method provided by the invention, after the nanometer heat insulation board blank and the nanometer coating are obtained, the nanometer coating is coated on the surface of the nanometer heat insulation board blank. Wherein, the coating mode is preferably spraying, brushing or rolling; the drying mode is preferably drying; the drying temperature is preferably 100-120 deg.C, and specifically 100 deg.C, 101 deg.C, 102 deg.C, 103 deg.C, 104 deg.C, 105 deg.C, 106 deg.C, 107 deg.C, 108 deg.C, 109 deg.C, 110 deg.C, 111 deg.C, 112 deg.C, 113 deg.C, 114 deg.C, 115 deg.C, 116 deg.C, 117 deg.C, 118 deg; the drying time is preferably 1-5 h, and specifically can be 1h, 1.5h, 2h, 2.5h, 3h, 3.5h, 4h, 4.5h or 5 h. And after drying, forming a nano coating on the surface of the nano heat insulation plate blank by using the nano coating, thus obtaining the nano plate with the catalytic and conductive functions.
The nano-coating is arranged on the surface of the nano-insulation board blank, contains nano-gold, nano-platinum, graphene and other components, and has an excellent catalytic and conductive function. The nano plate provided by the invention has excellent heat insulation function and catalytic conduction function, can be used for catalytic purification of harmful gases such as oxycarbide, hydrocarbon, carbonitride and the like in a heated state, and has wide application prospects in the fields of automobile exhaust purification, fuel cells, photo-thermal power generation systems and the like. The experimental results show that: the surface resistance of the nano plate provided by the invention is less than 200 omega, and the catalytic conversion rate of CO is more than 95%.
For the sake of clarity, the following examples are given in detail.
Example 1
1) Pouring 70 parts by weight of nano silicon dioxide with the particle size of 20nm into an industrial high-speed stirrer, and adding 8 parts by weight of 1140-DEG C aluminum silicate ceramic fiber with the length of 5mm and the diameter of 2.8 mu m; starting stirring, regulating the rotating speed to 800r/min, dispersing at a high speed for 8 minutes, stopping stirring, adding 20 parts by weight of rutile micro powder with the particle size of 3.0 mu m, regulating the rotating speed to 600r/min, mixing at a high speed for 3 minutes, discharging, and automatically distributing materials, dry-pressing for forming, releasing pressure and demolding and other equipment to prepare the nano plate blank.
2) Adding 41 parts by weight of deionized water into a high-speed dispersion machine, starting stirring at the stirring speed of 300 r/min, then adding 0.3 part by weight of PAA-PEO comb-shaped polymer dispersant with the polymerization degree of 2000, and stirring for 2 minutes; then adding 2 parts by weight of double-layer graphene with the particle size of 2 mu m and 1.7 parts by weight of montmorillonite with the particle size of 5 mu m, and stirring for 2 minutes; and adjusting the rotating speed to 600 revolutions per minute, adding 40 parts by weight of nano gold with the particle size of 12nm and 15 parts by weight of nano platinum with the particle size of 6nm, and dispersing at high speed for 10 minutes to obtain the multifunctional nano coating.
3) And spraying the multifunctional nano coating on six surfaces of the nano plate blank, and drying for 2 hours at 110 ℃ to obtain the nano plate with the catalytic and conductive functions, wherein the thickness of the coating of the nano plate is 0.1 mm.
Example 2
1) Pouring 65 parts by weight of nano silicon dioxide with the particle size of 20nm into an industrial high-speed stirrer, and adding 7 parts by weight of 1140-DEG C aluminum silicate ceramic fiber with the length of 5mm and the diameter of 2.8 mu m; starting stirring, regulating the rotating speed to 800r/min, dispersing at a high speed for 8 minutes, stopping stirring, adding 20 parts by weight of rutile micro powder with the particle size of 3.0 mu m, regulating the rotating speed to 600r/min, mixing at a high speed for 3 minutes, discharging, and automatically distributing materials, dry-pressing for forming, releasing pressure and demolding and other equipment to prepare the nano plate blank.
2) Adding 41 parts by weight of deionized water into a high-speed dispersion machine, starting stirring at the stirring speed of 300 r/min, then adding 0.3 part by weight of PAA-PEO comb-shaped polymer dispersant with the polymerization degree of 2000, and stirring for 2 minutes; then adding 2 parts by weight of double-layer graphene with the particle size of 2 mu m and 1.7 parts by weight of montmorillonite with the particle size of 5 mu m, and stirring for 2 minutes; and adjusting the rotating speed to 600 revolutions per minute, adding 40 parts by weight of nano gold with the particle size of 12nm and 15 parts by weight of nano platinum with the particle size of 6nm, and dispersing at high speed for 10 minutes to obtain the multifunctional nano coating.
3) And (3) brushing the multifunctional nano coating on six surfaces of the nano plate blank, and drying for 2 hours at 110 ℃ to obtain the nano plate with the catalytic and conductive functions, wherein the thickness of the coating of the nano plate is 0.4 mm.
Example 3
1) Pouring 65 parts by weight of nano silicon dioxide with the particle size of 20nm into an industrial high-speed stirrer, and adding 7 parts by weight of 1140-DEG C aluminum silicate ceramic fiber with the length of 5mm and the diameter of 2.8 mu m; starting stirring, regulating the rotating speed to 800r/min, dispersing at a high speed for 8 minutes, stopping stirring, adding 18 parts by weight of rutile micro powder with the particle size of 3.0 mu m, regulating the rotating speed to 600r/min, mixing at a high speed for 3 minutes, discharging, and automatically distributing materials, dry-pressing for forming, releasing pressure and demolding and other equipment to prepare the nano plate blank.
2) Adding 41 parts by weight of deionized water into a high-speed dispersion machine, starting stirring at the stirring speed of 300 r/min, then adding 0.3 part by weight of PAA-PEO comb-shaped polymer dispersant with the polymerization degree of 2000, and stirring for 2 minutes; then adding 2 parts by weight of double-layer graphene with the particle size of 2 mu m and 1.7 parts by weight of montmorillonite with the particle size of 5 mu m, and stirring for 2 minutes; and adjusting the rotating speed to 600 revolutions per minute, adding 40 parts by weight of nano gold with the particle size of 12nm and 15 parts by weight of nano platinum with the particle size of 6nm, and dispersing at high speed for 10 minutes to obtain the multifunctional nano coating.
3) And (3) rolling the multifunctional nano coating onto six surfaces of the nano plate blank by roller, and drying for 2 hours at 110 ℃ to prepare the nano plate with the catalytic and conductive functions, wherein the thickness of the coating of the nano plate is 0.5 mm.
Comparative example
Pouring 80 parts by weight of fumed silica with the particle size of 20nm into an industrial high-speed stirrer, and adding 5 parts by weight of chopped alkali-free glass fiber yarns with the length of 6mm and the diameter of 9 mu m; starting stirring, regulating the rotating speed to 800r/min, dispersing at a high speed for 10 minutes, stopping stirring, finally adding 15 parts by weight of rutile micro powder with the particle size of 3.0 mu m, regulating the rotating speed to 60r/min, mixing at a high speed for 3 minutes, discharging, and carrying out automatic operation of equipment such as automatic material distribution, dry pressing forming, pressure relief demolding and the like to prepare the common nano plate.
Evaluation of Performance
The composite nano-plates prepared in the embodiments 1 to 3 of the invention are numbered A, B, C in sequence, and the sample prepared in the comparative example is numbered D. The bulk density, CO catalytic conversion, and surface resistance of the samples were measured, respectively, to obtain the following results as shown in table 1:
TABLE 1 bulk density, CO catalytic conversion, surface resistance of nanoplates
| Sample (I) | Bulk density (Kg/m)3) | Catalytic conversion of CO/%) | Surface resistance/omega |
| A | 358 | 95.6 | 185 |
| B | 389 | 97.2 | 23 |
| C | 372 | 98.5 | 15 |
| D | 310 | 0.01 | 2.02×105 |
| Detection standard | GB/T17911 | / | GB/T1410 |
In table 1, the CO catalytic conversion was detected and calculated according to the following method: introducing 70% CO gas into a CO catalytic combustion furnace, wherein the heat insulation material of the CO catalytic combustion furnace is the nano plate in the embodiment or the comparative example, the filling amount of the nano plate in the reactor accounts for 20% of the volume of the catalytic combustion furnace, the temperature of the catalytic reaction is 400 ℃, and the residence time in the catalytic combustion furnace is 4 seconds; collecting gas before and after reaction by using a gas collector, testing the CO concentration in the gas before and after reaction by using a specific length type CO detection tube with the length of 500mm and the diameter of 20mm, and calculating the catalytic conversion rate of CO according to the following formula: CO catalytic conversion rate (pre-reaction CO concentration-post-reaction CO concentration)/pre-reaction CO concentration × 100%.
As can be seen from the data in Table 1, the catalytic conversion rate of the nano-plate provided by the embodiment of the invention to CO is up to more than 95%, the catalytic purification function is obvious, the surface resistance is as low as below 200 omega, and the nano-plate has a relatively ideal conductive function.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A nano plate with catalytic and conductive functions comprises a nano heat insulation plate blank and a nano coating compounded on the surface of the nano heat insulation plate blank;
the nano coating is formed by drying a nano coating, and the nano coating comprises the following components in parts by weight:
the dispersant is polyacrylic acid-polyoxyethylene comb polymer.
2. The nanoplate of claim 1, wherein the thickness of the nanocoating is 0.1-0.5 mm.
3. The nanoplate of claim 1, wherein the nanoplate blank comprises, in parts by weight:
50-80 parts of nano silicon dioxide;
2-10 parts of inorganic fiber material;
10-30 parts of an infrared opacifier.
4. The nano-plate of claim 3, wherein the inorganic fiber material comprises one or more of high silica fibers, polycrystalline alumina fibers, alumino-silicate ceramic fibers, and glass fiber chopped yarns.
5. The nanoplate of claim 3, wherein the infrared opacifier comprises one or more of micron-sized silicon carbide powder, micron-sized zirconium silicate powder, and micron-sized rutile powder.
6. A preparation method of a nano plate with a catalytic and conductive function comprises the following steps:
coating a nano coating on the surface of the nano heat insulation plate blank, and drying to obtain a nano plate with a catalytic and conductive function;
the nano coating comprises the following components in parts by weight:
the dispersant is polyacrylic acid-polyoxyethylene comb polymer.
7. The method of claim 6, wherein the coating is carried out by spraying, brushing or rolling.
8. The preparation method according to claim 6, wherein the drying temperature is 100-120 ℃; the drying time is 1-5 h.
9. The preparation method according to claim 6, wherein the nano thermal insulation board blank is prepared according to the following steps:
mixing the nano silicon dioxide, the inorganic fiber material and the infrared opacifier, and performing dry pressing to obtain a nano heat insulation board blank.
10. Use of the nanoplates as defined in any of claims 1 to 5 or prepared by the method as defined in any of claims 6 to 9 for catalytic purification of harmful gases.
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