CN112449449A - Coating process of electrothermal film layer and longitudinal electrode on inner/outer wall of quartz tube - Google Patents

Coating process of electrothermal film layer and longitudinal electrode on inner/outer wall of quartz tube Download PDF

Info

Publication number
CN112449449A
CN112449449A CN201910828564.7A CN201910828564A CN112449449A CN 112449449 A CN112449449 A CN 112449449A CN 201910828564 A CN201910828564 A CN 201910828564A CN 112449449 A CN112449449 A CN 112449449A
Authority
CN
China
Prior art keywords
electrothermal film
film layer
wall
coating
electrode
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201910828564.7A
Other languages
Chinese (zh)
Other versions
CN112449449B (en
Inventor
钱光耀
孙英杰
顾骋昊
金玥丰
杜亦巍
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shanghai Yunsheng New Material Technology Co ltd
Original Assignee
Shanghai Yunsheng New Material Technology Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shanghai Yunsheng New Material Technology Co ltd filed Critical Shanghai Yunsheng New Material Technology Co ltd
Priority to CN201910828564.7A priority Critical patent/CN112449449B/en
Publication of CN112449449A publication Critical patent/CN112449449A/en
Application granted granted Critical
Publication of CN112449449B publication Critical patent/CN112449449B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/40—Heating elements having the shape of rods or tubes
    • H05B3/42—Heating elements having the shape of rods or tubes non-flexible
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00—Inking and printing with a printer's forme
    • B41M1/12—Stencil printing; Silk-screen printing
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/02—Details
    • H05B3/03—Electrodes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]

Abstract

The invention discloses a coating process of an electrothermal film layer on the inner/outer wall of a quartz tube and a longitudinal electrode, which comprises the following steps: s1, uniformly spraying an electrothermal film solution on the inner wall or the outer wall of the quartz tube by using compressed air as a carrier and matching with a nozzle at 700 ℃ to form an electrothermal film layer, wherein the atomization fineness of the electrothermal film solution is 1-5 mu m, and the thickness of the electrothermal film layer is 400-800 nm; s2, adopting a screen printing process to form one or more pairs of electrode coatings on the surface of the electrothermal film layer on the inner wall or the outer wall of the quartz tube along the axial direction of the electrothermal film layer, uniformly distributing the one or more pairs of electrode coatings along the circumferential direction of the electrothermal film layer, and drying and curing the electrode coatings, wherein each pair of electrode coatings are symmetrically arranged along the axis of the electrothermal film layer. The coating process can constantly control the coating discharge pressure, the coating is uniform, the edge is neat, the combination of the electric heating film layer and the electrode coating is firm and reliable, the safety performance is high, the electric heating conversion rate is high, and the reactive loss is low.

Description

Coating process of electrothermal film layer and longitudinal electrode on inner/outer wall of quartz tube
Technical Field
The invention relates to the technical field of quartz electric heating pipes, in particular to a coating process of an electric heating film layer on the inner/outer wall of a quartz pipe and a longitudinal electrode.
Background
The quartz tube electric heating tube has the characteristics of good spectral radiation matching absorption characteristic, no degradation of radiation performance after long-term use, high heat conversion efficiency, high working temperature, wide selection range, quick temperature rise, small thermal inertia, high temperature resistance, corrosion resistance, stability of chemical thermal performance, long service life, high insulation strength, clean pollution-free heater and the like, is widely applied, particularly household appliances with high sanitary requirements can save energy by about 30 percent compared with common heating elements, the quartz tube packaged by the ceramic cap can resist the temperature up to 800 ℃, and has wide application prospect in the modern industrial field.
The existing quartz tube electric heating coating technology comprises magnetron sputtering, pulsed laser deposition, vapor deposition, sol-gel and other preparation processes. Generally, an electrothermal film layer is formed on the inner wall or the outer wall by adopting the certain process method, then an electrode coating is coated on the set position on the electrothermal film layer along the circumferential direction, and then an electrode is led out by a metal ring or a hoop and a high-temperature lead through a heating area, so that the method is unsafe and reliable, high in cost, long in production flow, difficult to realize automation and difficult to control the assembly quality; then, the existing electric heating film layer spraying process is attached to the quartz tube in a layer-by-layer accumulation mode, an obvious limit is formed between the electric heating film layer and the quartz tube, the thickness of the electric heating film layer is high, and reactive loss is large in the electric heating conversion process; in addition, because the electrode film layer is distributed in a narrow space or position on the electrothermal film layer on the inner wall or the outer wall of the quartz tube, the conventional electrode coating process is difficult to operate and complicated in process, the electrode film layer is not uniformly coated easily, the coating edge of the electrode film layer is not neat, and the metal ring or hoop is not completely attached to the electrode coating, so that the electrothermal film layer is influenced to uniformly generate heat, the electrothermal film layer is more easily ignited to break down, and potential safety hazards exist in a continuous long-term use state.
Disclosure of Invention
In order to solve the technical problems in the background art, the invention aims to provide a coating process for an electrothermal film layer on the inner wall or the outer wall of a quartz tube and a longitudinal electrode, which can constantly control the coating discharge pressure, and has the advantages of uniform coating, neat edge, high electrothermal conversion rate and low reactive loss.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a coating process of an electrothermal film layer on the inner/outer wall of a quartz tube and a longitudinal electrode, which comprises the following steps:
s1, under the heating condition, uniformly spraying electrothermal film solution on the inner wall or the outer wall of the quartz tube by using compressed air as a carrier and matching with a nozzle, and instantly thermally decomposing to form an electrothermal film layer through oxidation reaction, wherein the atomization fineness of the electrothermal film solution is 1-5 mu m, and the thickness of the electrothermal film layer is 400-800 nm;
s2, coating one or more pairs of electrode coatings on the surface of the electrothermal film layer on the inner wall or the outer wall of the quartz tube along the axial direction of the electrothermal film layer, uniformly distributing the one or more pairs of electrode coatings along the circumferential direction of the electrothermal film layer, symmetrically arranging each pair of electrode coatings along the axial center of the electrothermal film layer, and drying and curing the electrode coatings.
Preferably, the electrothermal film solution is prepared by mixing raw materials and a solvent according to the weight ratio of 1: (1-3), wherein the raw materials comprise tin tetrachloride, bismuth trioxide, boron trioxide, antimony trioxide, zinc chloride, copper chloride and ferric chloride, and the solvent comprises hydrochloric acid and one or more of methanol, ethanol, propylene glycol and water.
In step S1, the heating temperature is 700 ℃. In the step S2, a screen printing process is used to coat the electrode coating on the surface of the electrothermal film layer on the inner wall or the outer wall of the quartz tube, and the mesh number of the screen in the screen printing process is 300 meshes, so as to control the coating thickness of the electrode coating.
The raw materials and the solvent are selected to prepare the electrothermal film solution, the electrothermal film solution takes compressed air as a carrier and is matched with a nozzle to spray the inner wall or the outer wall of the quartz tube, the electrothermal film solution is atomized and instantaneously thermally decomposed at the high temperature of 700 ℃ to generate oxidation reaction, the formed electrothermal film layer is uniformly generated on the quartz tube in the form of chemical bonds, no obvious boundary exists between the quartz tube and the electrothermal film layer, and the difference is that the quartz tube and the electrothermal film layer are directly attached to a base material in a stacking way compared with the existing electrothermal film solution, therefore, the thickness of the electrothermal film layer is thin and transparent, and can be controlled at 800nm, the electrothermal conversion rate of the electrothermal film layer is up to more than 95%, and the reactive loss is low; in addition, under the condition that the distance between the two electrodes is short, the electrothermal film solution is selected, the resistance parameter of the electrothermal film layer can be regulated and controlled at will, the design and production of electrothermal elements with various power specifications are facilitated, and the electrothermal conversion efficiency is improved.
Preferably, the raw materials comprise the following components in parts by weight: 95-98 parts of tin tetrachloride, 0.15-0.3 part of bismuth trioxide, 0.18-0.38 part of boron trioxide, 1.5-3.8 parts of antimony trioxide, 0.15-0.285 part of zinc chloride, 0.02-0.055 part of copper chloride and 0.015-0.08 part of ferric chloride.
Preferably, the electrothermal film solution is prepared by the following method:
s1, weighing stannic chloride in proportion, and adding the stannic chloride into a solvent for dissolving to obtain a solution A;
s2, sequentially adding zinc chloride, copper chloride and ferric chloride into the solution A, adding hydrochloric acid into the solution A, and stirring to dissolve to obtain a solution B;
s3, respectively dissolving bismuth trioxide and antimony trioxide by hydrochloric acid, sequentially adding the bismuth trioxide and the antimony trioxide into the solution B, and stirring and mixing to obtain a solution C;
and S4, adding diboron trioxide into a proper amount of the solution C, heating and stirring until the diboron trioxide is completely dissolved, cooling at normal temperature for 1-3min, adding the solution C into the rest solution C, and stirring and mixing uniformly to obtain the electrothermal film solution.
Preferably, one end of the electrode coating in the length direction is flush with one end of the electrothermal film layer in the longitudinal length direction, the other end of the electrode coating in the length direction is 10-30mm longer than the other end of the electrothermal film layer in the longitudinal length direction to form an electrode leading-out end, the width of the electrode coating is 6-10mm, and the thickness of the electrode coating is 0.1 mm. The length, the width and the thickness of the electrode coating are set, so that the current carrying capacity of the electrode coating can be regulated, and the electrode leading-out fixing structure is located in a non-heating area.
Preferably, the symmetrically arranged electrode coating is designed into a longitudinal long straight strip with two linear side edges, a longitudinal curved strip with two curved side edges or a spiral line with two spiral side edges, so that the electrode coating spirally rises along the outer wall or the inner wall of the quartz tube.
Preferably, the material of the electrode coating is Ag slurry or Ag/Al composite slurry.
Compared with the prior art, the invention has the following beneficial effects:
(1) the electrothermal film solution in the invention takes compressed air as a carrier and is matched with a nozzle to spray the quartz tube at the temperature of 700 ℃, thermal decomposition oxidation reaction is instantly generated, the formed electrothermal film layer is uniformly generated on the quartz tube in the form of chemical bonds, no obvious limit exists between the quartz tube and the electrothermal film layer, and the difference is that the electrothermal film solution is attached to a base material in a direct stacking way compared with the existing electrothermal film solution, therefore, the thickness of the electrothermal film layer in the invention is thin and transparent, can be controlled at 800nm plus 400nm, the electrothermal conversion rate of the electrothermal film layer is up to more than 95%, and the reactive loss is low;
(2) by regulating and controlling the formula and the proportion of the electrothermal film solution, the electrothermal film solution can be selected and used under the condition of short distance between two electrodes, so that the resistance parameter of an electrothermal film layer can be regulated and controlled at will, the design and production of electrothermal elements with various power specifications are facilitated, and the electrothermal conversion efficiency is improved;
(3) by adopting the coating process, the electrode slurry is directly screen-printed on the electrothermal film layer to be used as an electrode, the electrode coating and the electrothermal film layer are uniformly coated, the combination is reliable, the edge of the electrode coating is neat, and the electrode leading-out fixing structure is positioned in a non-heating area, so that the coating process is safe and reliable, the temperature resistance grade of the material is effectively reduced, the production cost is saved, the product operation performance is stable and reliable, and the service life is prolonged.
(4) The coating process can realize automation, reduce human interference factors, improve work efficiency and product quality, shorten production flow and greatly reduce production cost.
Detailed Description
Example 1
A coating process of an electrothermal film layer and a longitudinal electrode on the inner wall of a quartz tube comprises the following steps:
s1, uniformly spraying an electrothermal film solution on the inner wall of the quartz tube by using compressed air as a carrier and matching with a nozzle at 700 ℃ to form an electrothermal film layer, wherein the atomization fineness of the electrothermal film solution is 3 mu m, and the thickness of the electrothermal film layer is 500 nm;
s2, a pair of electrode coatings is formed on the surface of the electrothermal film layer on the inner wall of the quartz tube by adopting a screen printing process along the axial direction of the electrothermal film layer, the electrode coatings are symmetrically arranged along the axial center of the electrothermal film layer, and then drying and curing treatment are carried out on the electrode coatings, wherein the symmetrically arranged electrode coatings are designed into longitudinal long straight strips with two linear side edges.
Wherein, one end of the electrode coating in the length direction is flush with one end corresponding to the longitudinal length of the electric heating film layer, the other end of the electrode coating in the length direction is 10-30mm longer than the other end of the electric heating film layer in the longitudinal length to form an electrode leading-out end, the width of the electrode coating is 8mm, and the thickness of the electrode coating is 0.1 mm. The material of the electrode coating is Ag slurry.
In order to accurately control the coating thickness of the electrode coating, the mesh number of the screen in the screen printing process is 300 meshes.
The electrothermal film solution is prepared from raw materials and a solvent according to the weight ratio of 1: 3, wherein the raw materials comprise the following components: 960g of tin tetrachloride, 2g of bismuth trioxide, 2.5g of boron trioxide, 15g of antimony trioxide, 2.85g of zinc chloride, 0.2g of copper chloride and 0.35g of ferric chloride; the solvent is hydrochloric acid and ethanol.
The preparation method of the electrothermal film solution comprises the following steps:
s1, weighing stannic chloride in proportion, and adding the stannic chloride into ethanol for dissolving to obtain a solution A;
s2, sequentially adding zinc chloride, copper chloride and ferric chloride into the solution A, adding hydrochloric acid into the solution A, and stirring to dissolve to obtain a solution B;
s3, respectively dissolving bismuth trioxide and antimony trioxide by hydrochloric acid, sequentially adding the bismuth trioxide and the antimony trioxide into the solution B, and stirring and mixing to obtain a solution C;
and S4, adding diboron trioxide into a proper amount of the solution C, heating and stirring until the diboron trioxide is completely dissolved, cooling at normal temperature for 1-3min, adding the solution C into the rest solution C, and stirring and mixing uniformly to obtain the electrothermal film solution.
Example 2
A coating process of an electrothermal film layer and a longitudinal electrode on the inner wall of a quartz tube comprises the following steps:
s1, uniformly spraying an electrothermal film solution on the inner wall of the quartz tube by using compressed air as a carrier and matching with a nozzle at 700 ℃ to form an electrothermal film layer, wherein the atomization fineness of the electrothermal film solution is 5 mu m, and the thickness of the electrothermal film layer is 800 nm;
s2, adopting a screen printing process to form 3 pairs of electrode coatings on the surface of the electrothermal film layer on the inner wall of the quartz tube along the axial direction of the electrothermal film layer, wherein the 3 pairs of electrode coatings are uniformly distributed along the circumferential direction of the electrothermal film layer, and each pair of electrode coatings are mutually symmetrical along the axis of the electrothermal film layer, and then drying and curing the electrode coatings, wherein the symmetrically arranged electrode coatings are designed into longitudinal curved strips with two curved side edges.
Wherein, one end of the electrode coating in the length direction is flush with one end corresponding to the longitudinal length of the electric heating film layer, the other end of the electrode coating in the length direction is 10-30mm longer than the other end of the electric heating film layer in the longitudinal length to form an electrode leading-out end, the width of the electrode coating is 6mm, and the thickness of the electrode coating is 0.1 mm. The material of the electrode coating is Ag/Al composite slurry.
In order to accurately control the coating thickness of the electrode coating, the mesh number of the screen in the screen printing process is 300 meshes.
The electrothermal film solution is prepared from raw materials and a solvent according to the weight ratio of 1: 1, wherein the raw materials comprise the following components: 950g of tin tetrachloride, 1.5g of bismuth trioxide, 1.8g of boron trioxide, 24g of antimony trioxide, 1.5g of zinc chloride, 0.32g of copper chloride and 0.15g of ferric chloride; the solvent is hydrochloric acid and methanol.
The preparation method of the electrothermal film solution comprises the following steps:
s1, weighing stannic chloride in proportion, and adding the stannic chloride into methanol for dissolving to obtain a solution A;
s2, sequentially adding zinc chloride, copper chloride and ferric chloride into the solution A, adding hydrochloric acid into the solution A, and stirring to dissolve to obtain a solution B;
s3, respectively dissolving bismuth trioxide and antimony trioxide by hydrochloric acid, sequentially adding the bismuth trioxide and the antimony trioxide into the solution B, and stirring and mixing to obtain a solution C;
and S4, adding diboron trioxide into a proper amount of the solution C, heating and stirring until the diboron trioxide is completely dissolved, cooling at normal temperature for 1-3min, adding the solution C into the rest solution C, and stirring and mixing uniformly to obtain the electrothermal film solution.
Example 3
A coating process of an electrothermal film layer and a longitudinal electrode on the outer wall of a quartz tube comprises the following steps:
s1, uniformly spraying an electrothermal film solution on the outer wall of the quartz tube by using compressed air as a carrier and matching with a nozzle at 700 ℃ to form an electrothermal film layer, wherein the atomization fineness of the electrothermal film solution is 1 mu m, and the thickness of the electrothermal film layer is 400 nm;
s2, forming an electrode coating by adopting a screen printing process on the surface of the electrothermal film layer on the outer wall of the quartz tube along the axial direction of the electrothermal film layer, and drying and curing the electrode coating, wherein the electrode coating is designed into a spiral line with two side edges arranged in a spiral way, so that the electrode coating spirally rises along the outer wall or the inner wall of the quartz tube.
Wherein, one end of the electrode coating in the length direction is flush with one end corresponding to the longitudinal length of the electric heating film layer, the other end of the electrode coating in the length direction is 10-30mm longer than the other end of the electric heating film layer in the longitudinal length to form an electrode leading-out end, the width of the electrode coating is 10mm, and the thickness of the electrode coating is 0.1 mm. The material of the electrode coating is Ag slurry.
In order to accurately control the coating thickness of the electrode coating, the mesh number of the screen in the screen printing process is 300 meshes.
The electrothermal film solution is prepared from raw materials and a solvent according to the weight ratio of 1: 2, wherein the raw materials comprise the following components: 980g of tin tetrachloride, 2.6g of bismuth trioxide, 3.8g of boron trioxide, 32g of antimony trioxide, 2g of zinc chloride, 0.55g of copper chloride and 0.8g of ferric chloride; the solvent is hydrochloric acid and propylene glycol.
The preparation method of the electrothermal film solution comprises the following steps:
s1, weighing stannic chloride in proportion, and adding the stannic chloride into propylene glycol for dissolving to obtain a solution A;
s2, sequentially adding zinc chloride, copper chloride and ferric chloride into the solution A, adding hydrochloric acid into the solution A, and stirring to dissolve to obtain a solution B;
s3, respectively dissolving bismuth trioxide and antimony trioxide by hydrochloric acid, sequentially adding the bismuth trioxide and the antimony trioxide into the solution B, and stirring and mixing to obtain a solution C;
and S4, adding diboron trioxide into a proper amount of the solution C, heating and stirring until the diboron trioxide is completely dissolved, cooling at normal temperature for 1-3min, adding the solution C into the rest solution C, and stirring and mixing uniformly to obtain the electrothermal film solution.
Example 4
A coating process of an electrothermal film layer and a longitudinal electrode on the outer wall of a quartz tube comprises the following steps:
s1, uniformly spraying an electrothermal film solution on the outer wall of the quartz tube by using compressed air as a carrier and matching with a nozzle at 700 ℃ to form an electrothermal film layer, wherein the atomization fineness of the electrothermal film solution is 3 mu m, and the thickness of the electrothermal film layer is 400 nm;
s2, adopting a screen printing process to form 4 pairs of electrode coatings on the surface of the electrothermal film layer on the outer wall of the quartz tube along the axial direction of the electrothermal film layer, uniformly distributing the 4 pairs of electrode coatings along the circumferential direction of the electrothermal film layer, wherein each pair of electrode coatings are mutually symmetrical along the axis of the electrothermal film layer, and then drying and curing the electrode coatings, wherein the symmetrically distributed electrode coatings are designed into longitudinal long straight strips with linear edges on two sides.
Wherein, one end of the electrode coating in the length direction is flush with one end corresponding to the longitudinal length of the electric heating film layer, the other end of the electrode coating in the length direction is 10-30mm longer than the other end of the electric heating film layer in the longitudinal length to form an electrode leading-out end, the width of the electrode coating is 8mm, and the thickness of the electrode coating is 0.1 mm. The material of the electrode coating is Ag slurry.
In order to accurately control the coating thickness of the electrode coating, the mesh number of the screen in the screen printing process is 300 meshes.
The electrothermal film solution is prepared from raw materials and a solvent according to the weight ratio of 1: 3, wherein the raw materials comprise the following components: 960g of tin tetrachloride, 3g of bismuth trioxide, 3g of boron trioxide, 38g of antimony trioxide, 2.4g of zinc chloride, 0.4g of copper chloride and 0.6g of ferric chloride; the solvent comprises hydrochloric acid and ethanol.
The preparation method of the electrothermal film solution comprises the following steps:
s1, weighing stannic chloride in proportion, and adding the stannic chloride into ethanol for dissolving to obtain a solution A;
s2, sequentially adding zinc chloride, copper chloride and ferric chloride into the solution A, adding hydrochloric acid into the solution A, and stirring to dissolve to obtain a solution B;
s3, respectively dissolving bismuth trioxide and antimony trioxide by hydrochloric acid, sequentially adding the bismuth trioxide and the antimony trioxide into the solution B, and stirring and mixing to obtain a solution C;
and S4, adding diboron trioxide into a proper amount of the solution C, heating and stirring until the diboron trioxide is completely dissolved, cooling at normal temperature for 1-3min, adding the solution C into the rest solution C, and stirring and mixing uniformly to obtain the electrothermal film solution.
The quartz tube having the inner/outer walls coated with the electrocaloric film layer and the longitudinal electrodes prepared in examples 1 to 4 of the present invention was connected to an electrode assembly at one end having a length longer than that of the electrocaloric film layer by 10 to 30mm, and immersed in water or continuously passed through water, thereby achieving sufficient heat exchange with water, rapid temperature rise or heating, and high thermal efficiency, and the thermal efficiencies of the devices in examples 1 to 4 were tested:
the specific test formula is as follows: eta ═ 1.16X 10-3×m×(T2-T1)]/(P×T)×100％。
Wherein eta is the thermal efficiency; m is the mass of water in units (Kg); t2 is water outlet temperature in units (DEG C); t1 is water inlet temperature in units (. degree. C.); p is power, in units (KW); t is time, unit (H).
The heat efficiency of the equipment in the embodiments 1 to 4 is more than or equal to 97 percent and is higher than the grade 1 grade of a 6.3.5 continuous water boiler in the QB/T4270-2011 commercial electric water boiler standard.
By adopting the coating process, the electrode slurry is directly screen-printed on the electrothermal film layer to be used as an electrode, the electrode coating and the electrothermal film layer are uniformly coated and reliably combined, the edge of the electrode coating is neat, and the electrode leading-out fixing structure is positioned in a non-heating area, so that the coating process is safe and reliable, the temperature resistance grade of the material is effectively reduced, the production cost is saved, the product operation performance is stable and reliable, and the service life is prolonged. The electrothermal conversion rate of the electrothermal film layer is up to more than 95%, and the reactive loss is low.
The present invention has been described in terms of specific examples, which are provided to aid understanding of the invention and are not intended to be limiting. For a person skilled in the art to which the invention pertains, several simple deductions, modifications or substitutions may be made according to the idea of the invention.

Claims (9)

1. A coating process of an electrothermal film layer on the inner wall and the outer wall of a quartz tube and a longitudinal electrode is characterized by comprising the following steps:
s1, under the heating condition, uniformly spraying an electrothermal film solution on the inner wall or the outer wall of the quartz tube by using compressed air as a carrier and matching with a nozzle to form an electrothermal film layer, wherein the atomization fineness of the electrothermal film solution is 1-5 mu m, and the thickness of the electrothermal film layer is 400-800 nm;
s2, coating one or more pairs of electrode coatings on the surface of the electrothermal film layer on the inner wall or the outer wall of the quartz tube along the axial direction of the electrothermal film layer, uniformly distributing the one or more pairs of electrode coatings along the circumferential direction of the electrothermal film layer, symmetrically arranging each pair of electrode coatings along the axial center of the electrothermal film layer, and drying and curing the electrode coatings.
2. The process for coating the electrothermal film layer on the inner wall and the outer wall of the quartz tube and the longitudinal electrode according to claim 1, wherein the electrothermal film solution is prepared from raw materials and a solvent according to the ratio of 1: (1-3), wherein the raw materials comprise tin tetrachloride, bismuth trioxide, boron trioxide, antimony trioxide, zinc chloride, copper chloride and ferric chloride, and the solvent comprises hydrochloric acid and one or more of methanol, ethanol, propylene glycol and water.
3. The coating process of the electrothermal film layer on the inner wall and the outer wall of the quartz tube and the longitudinal electrode according to claim 2, wherein the raw materials comprise the following components in parts by weight: 95-98 parts of tin tetrachloride, 0.15-0.3 part of bismuth trioxide, 0.18-0.38 part of boron trioxide, 1.5-3.8 parts of antimony trioxide, 0.15-0.285 part of zinc chloride, 0.02-0.055 part of copper chloride and 0.015-0.08 part of ferric chloride.
4. The process for coating the electrothermal film layer on the inner wall and the outer wall of the quartz tube and the longitudinal electrode according to claim 3, wherein the electrothermal film solution is prepared by the following steps:
s1, weighing stannic chloride in proportion, and adding the stannic chloride into a solvent for dissolving to obtain a solution A;
s2, sequentially adding zinc chloride, copper chloride and ferric chloride into the solution A, adding hydrochloric acid into the solution A, and stirring to dissolve to obtain a solution B;
s3, respectively dissolving bismuth trioxide and antimony trioxide by hydrochloric acid, sequentially adding the bismuth trioxide and the antimony trioxide into the solution B, and stirring and mixing to obtain a solution C;
and S4, adding diboron trioxide into a proper amount of the solution C, heating and stirring until the diboron trioxide is completely dissolved, cooling at normal temperature for 1-3min, adding the solution C into the rest solution C, and stirring and mixing uniformly to obtain the electrothermal film solution.
5. The process for coating an electrothermal film layer on the inner/outer wall of a quartz tube and a longitudinal electrode according to any one of claims 1 to 4, wherein the heating temperature in step S1 is 700 ℃.
6. The process for coating an electrothermal film layer and a longitudinal electrode on the inner/outer wall of a quartz tube according to any one of claims 1 to 4, wherein in step S2, a screen printing process is used to coat the electrode coating on the surface of the electrothermal film layer on the inner or outer wall of the quartz tube, and the mesh number of the screen in the screen printing process is 300 meshes.
7. The process for coating the electrothermal film layer on the inner/outer wall of the quartz tube and the longitudinal electrode according to any one of claims 1 to 4, wherein one end of the electrode coating in the length direction is flush with one end of the electrothermal film layer in the longitudinal length direction, the other end of the electrode coating in the length direction is 10-30mm longer than the other end of the electrothermal film layer in the longitudinal length direction to form an electrode lead-out end, the width of the electrode coating is 6-10mm, and the thickness of the electrode coating is 0.1 mm.
8. The process for coating an electrothermal film layer on the inner/outer wall of a quartz tube and a longitudinal electrode according to any one of claims 1 to 4, wherein the electrode coating has a spiral structure with two side edges being straight, curved or spirally rising.
9. The process for coating the electrothermal film layer on the inner/outer wall of the quartz tube and the longitudinal electrode according to any one of claims 1 to 4, wherein the material of the electrode coating is Ag slurry or Ag/Al composite slurry.
CN201910828564.7A 2019-09-03 2019-09-03 Coating process of electrothermal film layer on inner wall/outer wall of quartz tube and longitudinal electrode Active CN112449449B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910828564.7A CN112449449B (en) 2019-09-03 2019-09-03 Coating process of electrothermal film layer on inner wall/outer wall of quartz tube and longitudinal electrode

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910828564.7A CN112449449B (en) 2019-09-03 2019-09-03 Coating process of electrothermal film layer on inner wall/outer wall of quartz tube and longitudinal electrode

Publications (2)

Publication Number Publication Date
CN112449449A true CN112449449A (en) 2021-03-05
CN112449449B CN112449449B (en) 2023-06-06

Family

ID=74734010

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201910828564.7A Active CN112449449B (en) 2019-09-03 2019-09-03 Coating process of electrothermal film layer on inner wall/outer wall of quartz tube and longitudinal electrode

Country Status (1)

Country Link
CN (1) CN112449449B (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1708189A (en) * 2005-03-23 2005-12-14 冷同桂 Composite metal electrothermal film sol and method for producing electroheating tube with the same
CN107172727A (en) * 2017-05-31 2017-09-15 广西泰亿诺新能源有限公司 Nano electroheating film film liquid is formulated and preparation method and the preparation method of electrothermal tube
CN107682944A (en) * 2017-10-24 2018-02-09 张东升 A kind of semiconductor thermoelectric film and preparation method thereof

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1708189A (en) * 2005-03-23 2005-12-14 冷同桂 Composite metal electrothermal film sol and method for producing electroheating tube with the same
CN107172727A (en) * 2017-05-31 2017-09-15 广西泰亿诺新能源有限公司 Nano electroheating film film liquid is formulated and preparation method and the preparation method of electrothermal tube
CN107682944A (en) * 2017-10-24 2018-02-09 张东升 A kind of semiconductor thermoelectric film and preparation method thereof

Also Published As

Publication number Publication date
CN112449449B (en) 2023-06-06

Similar Documents

Publication Publication Date Title
CN102860122B (en) Coating film drying furnace
US8346069B2 (en) Water heating apparatus
CN104080208A (en) Manufacturing method of electrothermal film
CN107172727A (en) Nano electroheating film film liquid is formulated and preparation method and the preparation method of electrothermal tube
CN102036433B (en) Infrared electric heating film heating tube with double-film layer structure as well as preparation method and application thereof
CN112291867A (en) Transparent superlattice structure semiconductor nano electrothermal film and preparation method and application thereof
CN102761995B (en) Semiconductor electrothermal membrane preparation method
CN112449449A (en) Coating process of electrothermal film layer and longitudinal electrode on inner/outer wall of quartz tube
CN105142250A (en) Preparation method for semiconductor thermoelectric film
CN103781209A (en) Nano electric heating plate using chemical vapor deposition technology and manufacturing method thereof
CN104327554A (en) Electric heating paint
CN106060980A (en) Infrared heating plate, heating equipment and manufacturing method of infrared heating plate
CN204141996U (en) A kind of high temperature furnace made by microwave heat energy conversion sheet
WO2008020681A1 (en) Heating element and fluid heating apparatus using the same
CN103428910A (en) Heating pipe
CN2935696Y (en) Helix electro-thermal membrane type electro-thermal tube
CN1402594A (en) Process of mfg. electrothermal SnO2:F film heating pipe by ultrasonic spray
CN203120192U (en) Carbon fiber heating pipe
CN105036554B (en) A kind of preparation method of photosensitive quartz ampoule
CN204485838U (en) A kind of production auxiliary agent reactor
CN101610610A (en) A kind of Electric radiant Heating Film and coating process and device
CN107949080A (en) A kind of electrothermal conversion body coating and preparation method
CN208222829U (en) A kind of highly effective directly-heated LNG reheating system
US4916427A (en) Electronic electrothermal conversion material, its products and method for production thereof
CN101772228A (en) Heating pipe

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant