CN112049541A - Infrared radiation automatic door induction system - Google Patents
Infrared radiation automatic door induction system Download PDFInfo
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- CN112049541A CN112049541A CN202010838121.9A CN202010838121A CN112049541A CN 112049541 A CN112049541 A CN 112049541A CN 202010838121 A CN202010838121 A CN 202010838121A CN 112049541 A CN112049541 A CN 112049541A
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- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05F—DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
- E05F15/00—Power-operated mechanisms for wings
- E05F15/70—Power-operated mechanisms for wings with automatic actuation
- E05F15/73—Power-operated mechanisms for wings with automatic actuation responsive to movement or presence of persons or objects
- E05F15/74—Power-operated mechanisms for wings with automatic actuation responsive to movement or presence of persons or objects using photoelectric cells
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
- B05D3/0254—After-treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
- B05D5/08—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/63—Additives non-macromolecular organic
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/65—Additives macromolecular
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V8/00—Prospecting or detecting by optical means
- G01V8/10—Detecting, e.g. by using light barriers
- G01V8/12—Detecting, e.g. by using light barriers using one transmitter and one receiver
Abstract
The invention discloses an infrared radiation automatic door sensing system, which consists of an infrared emitting device, an infrared detecting device, a circuit processing system and a mechanical control system; the infrared emitting device emits infrared light after being electrified, the infrared emitting device is received by the infrared detecting device, the infrared light is converted into an electric signal through the circuit processing system and is transmitted to the mechanical system, and the mechanical system finally converts the received electric signal into a mechanical signal to control the opening and closing of the automatic door. The infrared radiation automatic door sensing system utilizes the fold-shaped structure of spherical graphene, realizes multi-stage infrared rapid infrared emission under the condensation and combination action of macromolecules and the cooperation of micromolecule high-radiation inorganic particles, and has the characteristics of low cost, easiness in manufacturing, interference resistance, high weather resistance and the like.
Description
Technical Field
The invention belongs to the technical field of infrared sensing, and particularly relates to an infrared radiation automatic door sensing system.
Background
Along with the development of society, the requirement of human beings on intelligent life is higher and higher, but simultaneously along with the gradual consumption of fossil energy, energy cost is higher and higher. Low-cost smart life has thus become an era of choice.
At present, laser equipment is commonly used in an infrared emission system, and the infrared emission system is high in cost and large in power consumption and is easily interfered by pollutants.
The interface infrared emission is mainly surface infrared emission of high-emissivity materials, such as pure silicon carbide, carbon tubes, and the like. But its emissivity has reached the conventional infrared emission limit (infrared emissivity 95%). To further enhance the infrared emission, multiple gradient infrared emissions must be introduced and well applied.
In addition, the coating must have certain hydrophobicity, so as to prevent rainwater and the like from corroding the infrared emission substrate, thereby improving the stability of the infrared emission system.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an infrared radiation automatic door sensing system which has a multistage infrared emission structure, realizes multistage energy input inhibition and multistage infrared radiation by reasonably designing material stacking structures of a copper foil reflection infrared reflection layer and a copper foil front infrared emission coating, provides a feasible scheme for low-cost infrared emission, can simultaneously realize the advantages of energy conservation, rapid large-area infrared emission, corrosion resistance, multiband simultaneous emission and the like, and provides guarantee for the stable operation of the automatic door sensing system.
The purpose of the invention is realized by the following technical scheme: an infrared radiation automatic door sensing system is composed of an infrared emitting device, an infrared detecting device, a circuit processing system and a mechanical control system; the infrared emitting device emits infrared light after being electrified, the infrared emitting device is received by the infrared detecting device, the infrared light is converted into an electric signal through the circuit processing system and is transmitted to the mechanical system, and the mechanical system finally converts the received electric signal into a mechanical signal to control the opening and closing of the automatic door. The infrared emission device is composed of a copper foil heating layer, an infrared reflection layer coated on the reverse side of the copper foil heating layer and an infrared radiation coating coated on the front side of the copper foil heating layer. The infrared reflecting layer is composed of polyaluminium silicate; the infrared radiation coating takes few-layer graphene as a bottom layer, silicon carbide as a middle radiation layer, a graphitizable high molecular layer as an upper layer and a rivet fixing layer, and spherical graphene penetrates through the middle radiation layer and the upper layer and rivets with the few-layer graphene through conjugation. The size of the spherical graphene is 0.1-2 mu m, and the total thickness of the bottom layer, the middle radiation layer and the upper layer is not more than 1/4 of the size of the spherical graphene; the thickness of the upper layer is less than 1/6 of the total thickness of the bottom layer and the middle radiating layer. The infrared radiation coating forms a layer-by-layer assembly structure in a centrifugal spraying mode.
Further, the graphitizable polymer layer is composed of graphitizable polymer, and the graphitizable polymer is selected from polyimide, asphalt or polyacrylonitrile with a molecular weight of 4000-12000.
Furthermore, the silicon carbide layer is composed of hyperbranched carbosilane, the molecular weight of the hyperbranched carbosilane is less than 10000, and the branching degree is 1.2-1.4.
Further, the polysilicate is feldspar (K)2O·Al2O3·6SiO2) Layer, mica (K)2O·2Al2O3·6SiO2·2H2O) layer, Kaolin (Al)2O3·2SiO2·22H2O) layer, zeolite (Na)2O·Al2O3·3SiO2·22H2O) layer or garnet (3 CaO. Al)2O3·3SiO2) And (3) a layer.
Further, the preparation method of the infrared emission device comprises the following steps:
(1) uniformly mixing 1 part by weight of spherical graphene, 0.001-0.01 part by weight of few-layer mechanically-exfoliated graphene, 0.005-0.01 part by weight of graphitizable high-molecular oligomer, 0.1-0.4 part by weight of hyperbranched carbosilane and 0.01-0.04 part by weight of peroxide cross-linking agent, centrifugally spraying on the front surface of the copper foil heating layer, simultaneously centrifugally spraying 0.1-5 parts by weight of polysilicate on the back surface of the copper foil heating layer, and then carrying out ultraviolet curing at the temperature of 60-120 ℃ for 1-6 h.
(2) And then heating and shaping are carried out to obtain the infrared emitting device.
Further, the peroxide crosslinking agents include, but are not limited to: dicumyl peroxide, methyl ethyl ketone peroxide, benzoic acid peroxide and 2, 5-dimethyl-2, 5-bis (tert-butylperoxy) hexane.
Further, the spherical graphene is prepared by spraying graphene oxide solution with the concentration of 0.1-1 mg/mL and carrying out chemical reduction and 1300-1600 ℃ thermal reduction, wherein I of the spherical graphene isD/IGThe value is not higher than 0.05 and the wall thickness is less than 4 atomic layers.
Further, the centrifugal force of the centrifugation is in the range of 4000-12000 rcf.
Further, the specific method for heating and shaping comprises the following steps: at the temperature of 0-250 ℃, the temperature rising speed is less than 5 ℃/min, and the temperature is controlled and preserved for 1-3 h; then heating to 500 ℃, wherein the heating speed is less than 5 ℃/min, and keeping the temperature for 1-3 h; then the temperature is quickly raised to 1300 ℃, the temperature raising speed is higher than 50 ℃/min, and the temperature is controlled for 1-5 min.
Compared with the prior art, the invention has the following beneficial effects: the invention realizes the layer-by-layer directional assembly of the insulating heat-conducting coating material by a centrifugal spraying mode according to different material densities, and finally realizes the infrared radiation. The few graphene layers have the function of thermal interface conduction, and heat is transferred to the graphene microspheres from the copper foil through the phonon resonance effect. The graphitizable high molecular layer is a carbonizable nano film actually, and the spherical graphene and the silicon carbide are linked to play a role of a rivet; the spherical graphene has two functions: firstly, heat is guided out from an interface to spherical graphene with a high specific surface area, and secondly, the spherical graphene has high radiance, radiates heat quickly and efficiently, and greatly enhances the radiation effect of silicon carbide.
The infrared reflecting layer is used for inhibiting heat dissipation and infrared radiation on the back surface of the copper foil, so that a copper foil unidirectional heat conduction structure can be formed, and the electric-infrared conversion efficiency is improved; due to the thickness design of the graphene ball, the middle radiation layer and the upper layer, the thermal resistance effect of the interface layer is weakened as much as possible, meanwhile, the position of the graphene ball as an infrared emission main body is increased, and the radiation effect is improved. The thickness of the upper layer is less than 1/6 the sum of the thicknesses of the middle and upper layers, and the upper layer acts as a rivet and does not have excessive thermal resistance effect on the silicon carbide radiating layer. Therefore, the infrared radiation device has the characteristics of energy conservation, high radiation and uniform infrared emission. The broadband high-intensity radiation can avoid the shielding effect of special substances on infrared light signals, and the external environment interference resistance of the infrared automatic door is greatly ensured.
Moreover, the graphene ball has certain hydrophobicity, and under the coordination of the hydrophobic surfaces of the microspheres and the coordination of the space between the microspheres, the surface of the infrared emission coating has good rainwater wetting property, so that the heating layer of the copper foil is protected from being corroded by external rainwater and the like, and the stability and the durability of infrared emission are enhanced.
Therefore, the infrared radiation automatic door sensing system has the characteristics of low cost, easy manufacture, interference resistance, high weather resistance and the like.
Detailed Description
In order that the objects and effects of the invention will become more apparent, the invention will be further described with reference to specific examples.
Example 1
The invention provides an infrared radiation automatic door sensing system, which consists of an infrared emitting device, an infrared detecting device, a circuit processing system and a mechanical control system; the infrared emitting device emits infrared light after being electrified, the infrared emitting device is received by the infrared detecting device, the infrared light is converted into an electric signal through the circuit processing system and is transmitted to the mechanical system, and the mechanical system finally converts the received electric signal into a mechanical signal to control the opening and closing of the automatic door. The infrared emission device is composed of a copper foil heating layer, an infrared reflection layer coated on the reverse side of the copper foil heating layer and an infrared radiation coating coated on the front side of the copper foil heating layer. The infrared emission device is prepared by the following method:
(1) carrying out spray treatment on a graphene oxide solution with the concentration of 0.1mg/mL at 200 ℃, reducing the graphene oxide solution for 8 hours at 80 ℃ through HI, and then carrying out infrared emission for 6 hours at 1300 ℃ to prepare the spherical graphene.
Scanning electron microscope detection proves that the spherical graphene is finally obtained, and Raman detection detects that the spherical graphene has the structure ID/IGThe value is 0.04 and its scale is 0.1 μm, with a spherical graphene wall thickness of 2 atomic layers.
(2) Uniformly mixing 1 part by weight of spherical graphene, 0.001 part by weight of few-layer mechanically-exfoliated graphene, 0.005 part by weight of polyimide with the molecular weight of 4000, 0.1 part by weight of hyperbranched carbosilane with the molecular weight of 9800 and the branching degree of 1.2 and 0.01 part by weight of dicumyl peroxide, centrifugally spraying the mixture on the front surface of a copper foil heating layer, and simultaneously, 0.1 part by weight of feldspar (K)2O·Al2O3·6SiO2) Centrifugally spraying the mixture on the back surface of the copper foil heating layer, setting the centrifugal force of 4000rcf, and then carrying out ultraviolet curing at the temperature of 120 ℃ for 1 h.
(3) And then carrying out heating setting, wherein the heating setting process comprises the following steps: at 250 ℃, the temperature rising speed is 4 ℃/min, and the heat preservation is controlled for 1 h; then heating to 500 ℃, wherein the heating speed is 3 ℃/min, and keeping the temperature for 1 h; and then heating to 1300 ℃, wherein the heating speed is 55 ℃/min, and the temperature is controlled for 1min to obtain the infrared emitting device.
The infrared emitting device prepared by the method has the following specific structure: the infrared reflecting layer is composed of polyaluminium silicate; the infrared radiation coating takes few-layer graphene as a bottom layer, silicon carbide as a middle radiation layer and a graphitizable high molecular layer as an upper layer and a rivet fixing layer, and spherical graphene penetrates through the bottom layer and the middle radiation layer and rivets with the few-layer graphene through conjugation. The total thickness of the bottom layer, the middle radiation layer and the upper layer is 1/4 of the size of the spherical graphene; the thickness of the upper layer is 1/7 the sum of the thicknesses of the bottom layer and the middle radiation layer.
The infrared emitting device prepared by the method is assembled into an infrared automatic door, is used in a simulated mode under various environments, does not show any insensitive sign within 1 continuous year, and is excellent in stability. Therefore, the multistage infrared radiation automatic door can be widely applied to occasions such as shopping malls, hotels and the like.
Example 2
The invention provides an infrared radiation automatic door sensing system, which consists of an infrared emitting device, an infrared detecting device, a circuit processing system and a mechanical control system; the infrared emitting device emits infrared light after being electrified, the infrared emitting device is received by the infrared detecting device, the infrared light is converted into an electric signal through the circuit processing system and is transmitted to the mechanical system, and the mechanical system finally converts the received electric signal into a mechanical signal to control the opening and closing of the automatic door. The infrared emission device is composed of a copper foil heating layer, an infrared reflection layer coated on the reverse side of the copper foil heating layer and an infrared radiation coating coated on the front side of the copper foil heating layer. The infrared emission device is prepared by the following method:
(1) carrying out spray treatment on a graphene oxide solution with the concentration of 1mg/mL at 200 ℃, reducing the graphene oxide solution by HI at 80 ℃ for 8h, and then carrying out infrared emission at 1600 ℃ for 6h to prepare the spherical graphene.
Scanning electron microscope detection proves that the spherical graphene is finally obtained, and Raman detection detects that the spherical graphene has the structure ID/IGThe value is 0.05 and its scale is 2 μm, with a spherical graphene wall thickness of 3-4 atomic layers.
(2) Uniformly mixing 1 part by weight of spherical graphene, 0.01 part by weight of few-layer mechanically-exfoliated graphene, 0.01 part by weight of pitch with the molecular weight of 12000, 0.4 part by weight of hyperbranched carbosilane with the molecular weight of 8000 and the branching degree of 1.4 and 0.04 part by weight of methyl ethyl ketone peroxide, centrifugally spraying the mixture on the front surface of a copper foil heating layer, and simultaneously, 5 parts by weight of mica (K)2O·2Al2O3·6SiO2·2H2O) centrifugally spraying on the reverse surface of the copper foil heating layer, setting the centrifugal force to be 12000rcf, and then carrying out ultraviolet curingThe temperature for the reaction is 60 ℃ and the time is 6 h.
(3) And then carrying out heating setting, wherein the heating setting process comprises the following steps: at 250 ℃, the temperature rising speed is 3.5 ℃/min, and the temperature is controlled to be kept for 3 h; then heating to 500 ℃, wherein the heating speed is 4 ℃/min, and keeping the temperature for 3 h; and then heating to 1300 ℃, wherein the heating speed is 60 ℃/min, and keeping the temperature for 5min to obtain the infrared emitting device.
The infrared emission device prepared by the method has the structure that: the infrared reflecting layer is composed of polyaluminium silicate; the radiation coating uses few-layer graphene as a bottom layer, silicon carbide as a middle radiation layer, a graphitizable high molecular layer as an upper layer and a rivet fixing layer, and spherical graphene penetrates through the bottom layer and the middle radiation layer and rivets with the few-layer graphene through conjugation. 1/5, wherein the total thickness of the bottom layer, the middle radiation layer and the upper layer is spherical graphene size; the thickness of the upper layer is 1/8 the sum of the thicknesses of the bottom layer and the middle radiation layer.
The infrared emitting device prepared by the method is assembled into an infrared automatic door, is used in a simulated mode under various environments, does not show any insensitive sign within 1 continuous year, and is excellent in stability. Therefore, the multistage infrared radiation automatic door can be widely applied to occasions such as shopping malls, hotels and the like.
Example 3
The invention provides an infrared radiation automatic door sensing system, which consists of an infrared emitting device, an infrared detecting device, a circuit processing system and a mechanical control system; the infrared emitting device emits infrared light after being electrified, the infrared emitting device is received by the infrared detecting device, the infrared light is converted into an electric signal through the circuit processing system and is transmitted to the mechanical system, and the mechanical system finally converts the received electric signal into a mechanical signal to control the opening and closing of the automatic door. The infrared emission device is composed of a copper foil heating layer, an infrared reflection layer coated on the reverse side of the copper foil heating layer and an infrared radiation coating coated on the front side of the copper foil heating layer. The infrared emission device is prepared by the following method:
(1) and carrying out spray treatment on a graphene oxide solution with the concentration of 0.5mg/mL at 200 ℃, reducing the graphene oxide solution at 80 ℃ for 8h through HI, and then carrying out infrared emission at 1600 ℃ for 6h to prepare the spherical graphene.
Scanning electron microscope detection proves that the spherical graphene is finally obtained, and Raman detection detects that the spherical graphene has the structure ID/IGThe value is 0.01 and its scale is 1 μm, with a spherical graphene wall thickness of 2 atomic layers.
(2) Uniformly mixing 1 part by weight of spherical graphene, 0.005 part by weight of few-layer mechanically-exfoliated graphene, 0.008 part by weight of polyacrylonitrile with the molecular weight of 6000, 0.2 part by weight of hyperbranched carbosilane with the molecular weight of 9000 and the branching degree of 1.2 and 0.02 part by weight of peroxybenzoic acid, centrifugally spraying the mixture on the front surface of a copper foil heating layer, and simultaneously adding 2 parts by weight of kaolin (Al)2O3·2SiO2·22H2O) centrifugally spraying the mixture on the reverse side of the copper foil heating layer, setting the centrifugal force to be 5000rcf, and then carrying out ultraviolet curing at the temperature of 100 ℃ for 2 h.
(3) And then carrying out heating setting, wherein the heating setting process comprises the following steps: at the temperature of 0 ℃, the heating rate is 4 ℃/min, and the heat preservation is controlled for 1 h; then heating to 500 ℃, wherein the heating speed is 3 ℃/min, and keeping the temperature for 1 h; and then heating to 1300 ℃, wherein the heating speed is 55 ℃/min, and the temperature is controlled for 1min to obtain the infrared emitting device.
The infrared emission device prepared by the method has the structure that: the infrared reflecting layer is composed of polyaluminium silicate; the radiation coating uses few-layer graphene as a bottom layer, silicon carbide as a middle radiation layer, a graphitizable high molecular layer as an upper layer and a rivet fixing layer, and spherical graphene penetrates through the bottom layer and the middle radiation layer and rivets with the few-layer graphene through conjugation. 1/10, wherein the total thickness of the bottom layer, the middle radiation layer and the upper layer is spherical graphene size; the thickness of the upper layer is 1/7 the sum of the thicknesses of the bottom layer and the middle radiation layer.
The infrared emitting device prepared by the method is assembled into an infrared automatic door, is used in a simulated mode under various environments, does not show any insensitive sign within 1 continuous year, and is excellent in stability. Therefore, the multistage infrared radiation automatic door can be widely applied to occasions such as shopping malls, hotels and the like.
Example 4
The invention provides an infrared radiation automatic door sensing system, which consists of an infrared emitting device, an infrared detecting device, a circuit processing system and a mechanical control system; the infrared emitting device emits infrared light after being electrified, the infrared emitting device is received by the infrared detecting device, the infrared light is converted into an electric signal through the circuit processing system and is transmitted to the mechanical system, and the mechanical system finally converts the received electric signal into a mechanical signal to control the opening and closing of the automatic door. The infrared emission device is composed of a copper foil heating layer, an infrared reflection layer coated on the reverse side of the copper foil heating layer and an infrared radiation coating coated on the front side of the copper foil heating layer. The infrared emission device is prepared by the following method:
(1) and carrying out spray treatment on a graphene oxide solution with the concentration of 0.5mg/mL at 200 ℃, reducing the graphene oxide solution at 80 ℃ for 8h through HI, and then carrying out infrared emission at 1600 ℃ for 6h to prepare the spherical graphene.
Scanning electron microscope detection proves that the spherical graphene is finally obtained, and Raman detection detects that the spherical graphene has the structure ID/IGThe value is 0.02 and its scale is 1.5 μm, with a spherical graphene wall thickness of 2 atomic layers.
(2) Uniformly mixing 1 part by weight of spherical graphene, 0.01 part by weight of few-layer mechanically-exfoliated graphene, 0.005 part by weight of polyimide with the molecular weight of 10000, 0.3 part by weight of hyperbranched carbosilane with the molecular weight of 8000 and the branching degree of 1.2 and 0.01 part by weight of 2, 5-dimethyl-2, 5-di (tert-butylperoxy) hexane, centrifugally spraying the mixture on the front surface of a copper foil heating layer, and simultaneously, 0.1-5 parts by weight of (K) 0.1-5 parts by weight2O·Al2O3·6SiO2) Centrifugally spraying the mixture on the back surface of the heating layer of the copper foil, setting the centrifugal force to be 8000rcf, and then carrying out ultraviolet curing at the temperature of 100 ℃ for 2 h.
(3) And then carrying out heating setting, wherein the heating setting process comprises the following steps: at the temperature of 0 ℃, the heating rate is 3 ℃/min, and the heat preservation is controlled for 3 h; then heating to 500 ℃, wherein the heating speed is 3 ℃/min, and keeping the temperature for 1 h; and then heating to 1300 ℃, wherein the heating speed is 60 ℃/min, and keeping the temperature for 1min to obtain the infrared emitting device.
The infrared emission device prepared by the method has the structure that: the infrared reflecting layer is composed of polyaluminium silicate; the radiation coating uses few-layer graphene as a bottom layer, silicon carbide as a middle radiation layer, a graphitizable high molecular layer as an upper layer and a rivet fixing layer, and spherical graphene penetrates through the bottom layer and the middle radiation layer and rivets with the few-layer graphene through conjugation. 1/4, wherein the total thickness of the bottom layer, the middle radiation layer and the upper layer is spherical graphene size; the thickness of the upper layer is 1/10 the sum of the thicknesses of the bottom layer and the middle radiation layer.
The infrared emitting device prepared by the method is assembled into an infrared automatic door, is used in a simulated mode under various environments, does not show any insensitive sign within 1 continuous year, and is excellent in stability. Therefore, the multistage infrared radiation automatic door can be widely applied to occasions such as shopping malls, hotels and the like.
Claims (9)
1. An infrared radiation automatic door sensing system is characterized by comprising an infrared emitting device, an infrared detecting device, a circuit processing system and a mechanical control system; the infrared emitting device emits infrared light after being electrified, the infrared emitting device is received by the infrared detecting device, the infrared light is converted into an electric signal through the circuit processing system and is transmitted to the mechanical system, and the mechanical system finally converts the received electric signal into a mechanical signal to control the opening and closing of the automatic door. The infrared emission device is composed of a copper foil heating layer, an infrared reflection layer coated on the reverse side of the copper foil heating layer and an infrared radiation coating coated on the front side of the copper foil heating layer. The infrared reflecting layer is composed of polyaluminium silicate; the infrared radiation coating takes few-layer graphene as a bottom layer, silicon carbide as a middle radiation layer, a graphitizable high molecular layer as an upper layer and a rivet fixing layer, and spherical graphene penetrates through the middle radiation layer and the upper layer and rivets with the few-layer graphene through conjugation. The size of the spherical graphene is 0.1-2 mu m, and the total thickness of the bottom layer, the middle radiation layer and the upper layer is not more than 1/4 of the size of the spherical graphene; the thickness of the upper layer is less than 1/6 of the total thickness of the bottom layer and the middle radiating layer. The infrared radiation coating forms a layer-by-layer assembly structure in a centrifugal spraying mode.
2. The infrared radiation automatic door sensing system as claimed in claim 1, wherein the graphitizable polymer layer is made of graphitizable polymer selected from polyimide, pitch, or polyacrylonitrile with molecular weight of 4000-12000.
3. The infrared radiation automatic door sensing system of claim 1, wherein the silicon carbide layer is composed of hyperbranched carbosilane, the hyperbranched carbosilane has a molecular weight of less than 10000 and a degree of branching of 1.2-1.4.
4. The infrared reflecting layer according to claim 1, wherein said polysilicate is feldspar (K)2O·Al2O3·6SiO2) Mica (K)2O·2Al2O3·6SiO2·2H2O), kaolin (Al)2O3·2SiO2·22H2O), zeolite (Na)2O·Al2O3·3SiO2·22H2O) or garnet (3 CaO. Al)2O3·3SiO2)。
5. The infrared radiation automatic door sensing system of claim 1, wherein the infrared emitting device is prepared by the following method:
(1) uniformly mixing 1 part by weight of spherical graphene, 0.001-0.01 part by weight of few-layer mechanically-exfoliated graphene, 0.005-0.01 part by weight of graphitizable high-molecular oligomer, 0.1-0.4 part by weight of hyperbranched carbosilane and 0.01-0.04 part by weight of peroxide cross-linking agent, centrifugally spraying on the front surface of the copper foil heating layer, simultaneously centrifugally spraying 0.1-5 parts by weight of polysilicate on the back surface of the copper foil heating layer, and then carrying out ultraviolet curing at the temperature of 60-120 ℃ for 1-6 h.
(2) And then heating and shaping are carried out to obtain the infrared emitting device.
6. The infrared radiation automatic door sensing system of claim 5, wherein the peroxide crosslinking agent includes, but is not limited to: dicumyl peroxide, methyl ethyl ketone peroxide, benzoic acid peroxide and 2, 5-dimethyl-2, 5-bis (tert-butylperoxy) hexane.
7. The infrared radiation automatic door sensing system as claimed in claim 5, wherein the spherical graphene is prepared by spraying graphene oxide solution with concentration of 0.1mg/mL-1mg/mL, and performing chemical reduction and 1300-1600 ℃ thermal reduction, wherein I of the spherical graphene isD/IGThe value is not higher than 0.05 and the wall thickness is less than 4 atomic layers.
8. The infrared radiation automatic door sensing system as claimed in claim 5, wherein the centrifugal force of the centrifuge is in the range of 4000-.
9. The infrared radiation automatic door sensing system of claim 5, characterized in that the specific method of heat setting is: at the temperature of 0-250 ℃, the temperature rising speed is less than 5 ℃/min, and the temperature is controlled and preserved for 1-3 h; then heating to 500 ℃, wherein the heating speed is less than 5 ℃/min, and keeping the temperature for 1-3 h; then the temperature is quickly raised to 1300 ℃, the temperature raising speed is higher than 50 ℃/min, and the temperature is controlled for 1-5 min.
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| CN112048198A (en) * | 2020-08-19 | 2020-12-08 | 浙江工业大学 | Ship heat dissipation coating and preparation method thereof |
| CN112048200A (en) * | 2020-08-19 | 2020-12-08 | 浙江工业大学 | Building wall back-shadow heat-dissipation coating and preparation method thereof |
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