CN112082278B - Interlayer liner and preparation method and application thereof - Google Patents

Interlayer liner and preparation method and application thereof Download PDF

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Publication number
CN112082278B
CN112082278B CN201910505583.6A CN201910505583A CN112082278B CN 112082278 B CN112082278 B CN 112082278B CN 201910505583 A CN201910505583 A CN 201910505583A CN 112082278 B CN112082278 B CN 112082278B
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Prior art keywords
steel plate
interlayer
liner
layer steel
treatment
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CN112082278A (en
Inventor
何羽
闫苇
尚山峰
高朋理
徐明明
孙志伟
刘中通
闫敬涛
张维杰
张�杰
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Qingdao Haier Co Ltd
Qingdao Economic and Technological Development Zone Haier Water Heater Co Ltd
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Qingdao Haier Co Ltd
Qingdao Economic and Technological Development Zone Haier Water Heater Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S80/00—Details, accessories or component parts of solar heat collectors not provided for in groups F24S10/00-F24S70/00
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23D—ENAMELLING OF, OR APPLYING A VITREOUS LAYER TO, METALS
    • C23D5/00—Coating with enamels or vitreous layers
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/40—Solar thermal energy, e.g. solar towers

Abstract

The invention provides an interlayer liner and a preparation method and application thereof, wherein the preparation method comprises the following steps: 1) respectively spraying the cleaned outer layer steel plate and the inner layer steel plate by using a borax water solution, and then drying; 2) welding the dried outer layer steel plate and the dried inner layer steel plate, and then performing burning and enameling treatment on the inner wall of the liner formed by the inner layer steel plate to obtain the interlayer liner; in the spraying treatment, the spraying volume of the aqueous solution of the borax for the steel plate in unit area is 45-55 ml; the mass concentration of the borax water solution is 5-8%. The preparation method can effectively inhibit the generation of the interlayer oxide skin in the liner enameling process, and is simple and easy to implement and low in time cost.

Description

Interlayer liner and preparation method and application thereof
Technical Field
The invention relates to an interlayer liner and a preparation method and application thereof, belonging to the technical field of metal oxidation resistance treatment.
Background
The solar water heater is a device for converting solar energy into heat energy, and is used for heating tap water from low temperature to high temperature so as to meet the living requirements of people.
The existing solar water heater comprises a water tank and a plurality of heat collecting pipes, wherein the water tank comprises an enamel inner container and an outer container arranged outside the enamel inner container in an enclosing mode, the outer container and the enamel inner container are fixedly arranged to form a closed interlayer to form an interlayer inner container, and heat transfer media are added into the heat collecting pipes and the interlayer to absorb heat. When the solar water heater works, the heat collecting pipes and the heat transfer medium in the interlayer absorb heat, and then the heat is transferred to the cold water in the inner container through the wall of the enamel inner container, so that the cold water in the enamel inner container is heated. However, during the process of enameling the inner liner, a large amount of oxide scale is generated inside the interlayer, so that a circulation channel between the interlayer and the heat collecting tube is blocked, and the circulation of a heat transfer medium is not smooth, thereby reducing the heat transfer efficiency.
The currently used method for removing the oxide skin comprises the following steps: 1. and after the inner container is welded, sodium silicate is introduced into the interlayer for oxidation resistance treatment, so that the generation of an oxide skin in the enameling process is inhibited. The treatment method is not ideal for inhibiting the generation of oxide skin, and the sodium silicate has strong volatility and can cause irreversible damage to the respiratory tract of an operator; 2. after the enameling is finished, the inner container of the interlayer is soaked in liquid medicine or acid liquor to remove the generated oxide skin. Due to the complex sandwich structure, the method can only ensure that part of the oxide skin is removed, and the method is long in time consumption and does not benefit the improvement of production efficiency.
Disclosure of Invention
The invention provides an interlayer liner, wherein an interlayer in the interlayer liner does not produce oxide skin blocking a circulation channel in the process of enameling the liner, so that the smoothness of the circulation channel of a heat medium can be effectively ensured, good circulation of the heat medium is facilitated, and the heat transfer efficiency is obviously improved.
The invention also provides a preparation method of the interlayer liner, which can effectively inhibit the generation of an interlayer oxide skin in the lining burning process of the liner, is simple and easy to implement, has low time cost and can not cause damage to operators.
The invention also provides an application of the interlayer liner.
The invention provides a preparation method of an interlayer liner, which comprises the following steps:
1) respectively spraying the cleaned outer layer steel plate and the inner layer steel plate by using a borax water solution, and then drying;
2) welding the dried outer layer steel plate and the dried inner layer steel plate, and then performing burning and enameling treatment on the inner wall of the liner formed by the inner layer steel plate to obtain the interlayer liner;
in the spraying treatment, the spraying volume of the aqueous solution of the borax for the steel plate in unit area is 45-55 ml;
the mass concentration of the borax water solution is 5-8%.
The preparation method of the interlayer liner comprises the step of preparing the borax water solution at the temperature of 40-65 ℃.
The preparation method of the interlayer liner comprises the step of spraying the interlayer liner, wherein the pressure of the spraying treatment is 0.45-0.65 Mpa.
The preparation method of the interlayer liner comprises the steps of drying at the temperature of 120-160 ℃ for 150-170 seconds.
The preparation method of the interlayer liner comprises the following steps: and (3) spraying the outer-layer steel plate and the inner-layer steel plate by using a cleaning agent, wherein the pH value of the cleaning agent is more than or equal to 10.
The preparation method of the interlayer liner comprises the steps of preparing the cleaning agent, and cleaning the interlayer liner at the temperature of 50-70 ℃ for 90-100 s.
The preparation method of the interlayer liner comprises the following steps of carrying out hot water leaching treatment on the outer layer steel plate and the inner layer steel plate before the cleaning treatment;
in the hot water leaching treatment, the water temperature is 50-70 ℃ and the time is 50-55 s.
The preparation method of the interlayer liner comprises the steps of performing enameling treatment at the enameling temperature of 750 ℃ and 870 ℃ for 30-35 min.
The preparation method of the interlayer liner further comprises sanding the inner wall of the liner before the enameling.
The invention provides an interlayer liner, which is prepared by any one of the preparation methods.
The invention also provides a solar water heater which comprises the interlayer liner.
The implementation of the invention at least comprises the following advantages:
1. according to the preparation method of the interlayer liner, the boron-sand aqueous solution is sprayed on the steel plate before welding, and a protective layer can be formed on the surface of the steel plate, so that the oxidation resistance of the interlayer is remarkably improved, and the generation of oxide skin is effectively inhibited;
2. the preparation method of the interlayer liner has the advantages of simple process flow and strong operability, and does not cause damage to the bodies of operators;
3. according to the interlayer liner disclosed by the invention, in the process of burning and enameling the liner, oxide skin blocking a circulation channel cannot be generated in the interlayer, so that the smoothness of circulation of a heat transfer medium can be effectively ensured, and the heat conductivity can be favorably improved;
4. the solar water heater of the invention adopts the interlayer inner container with the interlayer with the extremely strong oxidation resistance, so that the problem that the interlayer is blocked by oxide skin can not be caused, the heat-conducting property and the solar energy utilization rate of the solar water heater are obviously enhanced, and the user satisfaction is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a graph showing the effect of the antioxidant capacity of the interlayer liner of example 1;
FIG. 2 is a graph showing the effect of the antioxidant capacity of the interlayer liner of example 2;
FIG. 3 is a graph showing the effect of the antioxidant capacity of the interlayer liner of example 3;
FIG. 4 is a graph showing the effect of the antioxidant capacity of the interlayer liner of example 4;
FIG. 5 is a graph showing the effect of the steel plate material after the cleaning treatment in comparative example 1;
FIG. 6 is a graph showing the effect of the interlayer oxidation resistance of the interlayer liner of comparative example 3.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. 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. It should be noted that the embodiments and features of the embodiments of the present invention may be arbitrarily combined with each other without conflict.
The invention provides a preparation method of an interlayer liner, which comprises the following steps:
1) respectively spraying the cleaned outer layer steel plate and the inner layer steel plate by using a borax water solution, and then drying;
2) respectively welding the dried outer layer steel plate and the dried inner layer steel plate into an outer container and an inner container, and then carrying out burning and enameling treatment on the inner wall of the inner container to obtain the interlayer inner container;
in the spraying treatment, the spraying volume of the aqueous solution of the borax for the steel plate in unit area is 45-55 ml;
the mass concentration of the borax water solution is 5-8%.
The outer layer steel plate and the inner layer steel plate used for manufacturing the interlayer liner can be hot rolled steel plate SPHC, the thickness of the inner layer steel plate is 1.8mm, and the thickness of the outer layer steel plate is 1.5mm
Because the surface of the steel plate is stained with grease substances in the forming process, the outer layer steel plate and the inner layer steel plate need to be cleaned firstly to remove grease attached to the surfaces of the outer layer steel plate and the inner layer steel plate, so that the subsequent treatment is facilitated.
And after the cleaning treatment is finished, spraying the surfaces of the outer-layer steel plate and the inner-layer steel plate by using a boron sand aqueous solution, and ensuring that each surface of the outer-layer steel plate and each surface of the inner-layer steel plate are sprayed by the boron sand aqueous solution.
When the borax water solution is used for processing the steel plate, the oxidation resistance of the steel plate can be improved to a certain extent. In order to maximize the oxidation resistance, the inventor finds that when a steel plate per unit area (square meter) is uniformly sprayed by 45-55ml of borax water solution with the mass concentration of 5-8%, a protective layer with good integrity is favorably formed on the surface of the steel plate, and the protective layer can effectively isolate the surface of the steel plate from the outside, so that the oxidation resistance of the steel plate is remarkably improved. Furthermore, when the steel plate is processed into the interlayer liner, the interlayer does not generate a large amount of oxide skin due to the high temperature of enamel firing.
In specific implementation, the steel plate material in unit area can be uniformly sprayed by 50ml of 5-8% by mass boron sand water solution.
When spraying the borax water solution, a plurality of steel plates to be treated can be tiled, and the steel plates are sprayed by arranging spray heads for spraying the borax water solution around the steel plates. The requirement of the steel plate on the volume of the borax water solution can be ensured by adjusting the spraying flow and the spraying time of the spray head. And can also reduce the spraying time through improving the flow that sprays of shower nozzle to further promote and spray efficiency, shorten the preparation cycle of intermediate layer inner bag.
When the borax water solution is prepared, the preparation of the 5-8 wt% borax water solution can be realized by controlling the mass ratio of borax to water, but for the borax water solution prepared in advance, the borax water solution is generally titrated before spraying treatment is carried out, so that the real-time mass concentration of the borax water solution is obtained. If the real-time mass concentration is in the range, the spraying treatment can be directly carried out; if the real-time mass concentration is not in the range, borax or water can be selectively added into the mixture according to the real-time mass concentration.
The borax water solution of the invention can be prepared by the following method: controlling the ratio of borax to water according to the mass concentration of 5-8%, adding borax into water, heating the system to 40-65 ℃, and stirring until the system is clear to obtain the borax water solution.
The specific titration method can be to use methyl orange as an indicator and perform titration by hydrochloric acid.
And after the spraying treatment of the borax water solution is finished, drying the steel plate, thereby forming a protective layer on the surface of the steel plate.
And then, welding the inner layer steel plate and the outer layer steel plate to enable the outer layer steel plate and the inner layer steel plate to respectively form an outer liner and an inner liner, the inner liner is fixedly sleeved in the outer liner, and finally a structure with an interlayer inner liner is formed, wherein an annular channel between the inner liner and the outer liner is the interlayer.
Compared with a steel plate which is not treated by the borax water solution, when the inner layer steel plate and the outer layer steel plate are welded, the welding seam is smoother, the welding deformation degree is small, the correction time in the welding process is effectively reduced, the working efficiency is improved, and the quality of the interlayer liner is improved.
And after the welding treatment is finished, performing enamel firing treatment on the inner wall of the liner to finally obtain the interlayer liner.
According to the preparation method of the interlayer liner, the specific aqueous solution of the borax is adopted to carry out appropriate spraying treatment on the steel plate, so that the oxidation resistance of the interlayer can be enhanced to the greatest extent, the generation of subsequent oxide skin is inhibited, the steel plate treated by the aqueous solution of the borax has the characteristic of easy welding, and high-quality welding can be completed in a short time, so that the quality of the interlayer liner is further improved. In addition, by adjusting the technological parameters in the spraying process, the spraying time can be effectively shortened, and the preparation period of the interlayer liner is shortened.
Further, the temperature of the borax water solution is 40-65 ℃ when the spraying treatment is carried out. The temperature can help to exert the treatment effect of the borax water solution on steel plates, and is beneficial to improving the oxidation resistance of the interlayer.
In addition, the spraying pressure of the borax water solution can be limited to further enhance the oxidation resistance of the interlayer. In the invention, the spraying pressure of the borax water solution is 0.45-0.65 Mpa.
The invention also researches the drying temperature and drying time after the spraying treatment, and the result shows that when the drying temperature is 120-160 ℃ and the drying time is 150-170s, the oxidation resistance of the interlayer can be enhanced, thereby inhibiting the generation of the oxide skin.
The drying temperature may be further limited to 120-130 ℃ when the drying operation is specifically performed.
The inventor speculates that the drying temperature and the drying time are beneficial to enabling the borax water solution to form a more complete protective layer with excellent compactness on the surface of the steel plate, so that the generation of an interlayer oxide skin caused by the enameling burning treatment can be further inhibited, or the adhesion between the protective layer and the steel plate is increased, and the cracking and even falling off of the protective layer caused by the high temperature of the enameling burning treatment are avoided.
In addition, in order to further increase the treatment effect of the borax water solution on the surface of the steel plate, the invention also limits the cleaning treatment.
Specifically, the cleaning agent can be used for spraying the outer layer steel plate and the inner layer steel plate, wherein the pH value of the cleaning agent is more than or equal to 10.
In a specific implementation mode, an aqueous solution containing potassium hydroxide, a chelating agent and the like can be selected as a cleaning agent to clean the steel plate, so that grease attached to the steel plate can be removed, and the bonding tightness between the protective layer and the surface of the steel plate can be improved. Specifically, the cleaning agent comprises the following components in percentage by mass: 5-8% of potassium hydroxide, 45-52% of sodium carbonate, 20-28% of sodium silicate, 0.5-1% of sodium phosphate, 0.2-1% of chelating agent and the balance of water.
In the specific implementation process, the steel plate can be sprayed for 90-100s by using a cleaning agent at 50-70 ℃ under the spraying pressure of 0.45-0.65 mpa. Wherein, the temperature and the cleaning time of the cleaning agent are further selected according to the size of the steel plate to be cleaned and the grease adhesion degree. After the cleaning treatment, the steel plate can be washed at least twice by using water with the temperature of 20-25 ℃, and the washing time is 30-35s each time, so that the surface of the steel plate is ensured not to have cleaning agent residues.
Further, before the cleaning treatment with the cleaning agent, the method further includes: carrying out hot water leaching treatment on the outer layer steel plate and the inner layer steel plate, and dissolving impurities with certain water solubility; in the hot water leaching treatment, the water temperature is 50-70 ℃ and the time is 50-55s, and the hot water leaching treatment can be carried out under the water pressure of 0.45-0.65 mpa.
The enameling treatment sequentially comprises wet enameling, enameling drying and enameling firing, so that a smooth and flat enamel layer is finally formed on the inner wall of the liner.
Specifically, the mass ratio of the enamel to the water in the glaze slip is 2-2.5: 1, the enameling and drying temperature is 100-120 ℃, the enameling and drying time is 25-30min, the enameling and drying temperature is 750-870 ℃, and the enameling and drying time is 30-35min
In order to reduce the influence of the enameling treatment on the protective layer on the surface of the interlayer as much as possible, the enameling drying temperature is 100 ℃, the drying time is 25min, the enameling temperature is 750 ℃, and the enameling time is 30 min. The enameling firing process can effectively prevent the protective layer from being damaged by the enameling firing treatment, such as falling or cracking of the protective layer, provides a relatively safe and stable environment for protecting the interlayer by the protective layer, and further reduces the possibility of generating oxide scale.
Before the enameling by the enameling process (after welding), the inner wall of the liner can be subjected to sanding treatment, so that the inner wall of the liner becomes a clean and uniform surface with certain roughness, the glaze slurry can be uniformly attached to the inner wall of the liner, uniform and stable melting can occur in the enameling treatment, and finally, a complete enamel layer tightly combined with the inner wall of the liner is formed.
Specifically, the inner wall of the inner container can be treated by using a mixture of steel shots with the diameter of 0.5mm and sand with the particle size of 1-4 mm as a sand body, and further, the mass ratio of the steel shots to the sand is controlled to be 3:1, the sanding time is 30s, the moving speed of a sanding spray gun is 20-50 mm/s, the rotating speed of the spray gun is 30-50 r/min, and the injection pressure of the sanding spray gun is 0.6-0.9 MPa.
The invention also provides a sandwich liner which is prepared according to any one of the preparation methods.
The interlayer of the interlayer liner has excellent oxidation resistance due to the spraying treatment of the aqueous solution of the perborate sand, so that the oxide skin can be effectively inhibited from generating in the liner enameling treatment process, the oxide skin is prevented from blocking a heat medium circulation channel, and the excellent heat conduction performance of the interlayer liner is ensured.
The invention also provides a solar water heater which comprises the interlayer liner.
The solar water heater has the interlayer liner with outstanding oxidation resistance, and the interlayer does not block a heat medium circulation channel due to excessive oxide skin, so the solar water heater has the advantages of good heat conduction effect and high heat utilization rate.
The method for manufacturing the interlayer liner of the present invention will be described in detail below with reference to specific embodiments.
Example 1
The preparation method of the sandwich liner comprises the following steps:
1) cleaning treatment
Carrying out spray type cleaning treatment on the surfaces of the outer layer steel plate and the inner layer steel plate by using a cleaning agent, wherein the spray pressure of the cleaning agent is 0.52Mpa, the temperature of the cleaning agent is 58 ℃, and the cleaning time is 95 s;
wherein, the cleaning agent comprises 5 to 8 percent of potassium hydroxide, 45 to 52 percent of sodium carbonate, 20 to 28 percent of sodium silicate, 0.5 to 1 percent of sodium phosphate, 0.2 to 1 percent of chelating agent and the balance of water.
2) Spraying treatment of borax water solution
Spraying the outer-layer steel plate and the inner-layer steel plate by using a boric sand aqueous solution with the mass concentration of 6% and the temperature of 28 ℃, and uniformly treating the steel plates in unit area by using 50ml of the boric sand aqueous solution by controlling the spraying flow and the spraying time;
3) drying process
Drying the outer layer steel plate and the inner layer steel plate at 126 ℃ for 164 s;
4) welding process
Welding the outer layer steel plate and the inner layer steel plate to form a structure of the interlayer liner;
5) enameling treatment
And (3) injecting the glaze slip into the liner by using a wet enameling mode, enameling and drying (100 ℃, 25min) the glaze slip, then carrying out enameling firing at 750 ℃, and forming an enamel layer on the inner wall of the liner after 30min to obtain the interlayer liner of the embodiment.
The interlayer liner of the present embodiment was cut to see if oxide scale was formed on the surface of the interlayer.
Fig. 1 is a graph showing the effect of the interlayer oxidation resistance of the interlayer liner in example 1, and it can be seen from an observation of fig. 1 that the interlayer liner of the present example has only a small amount of scale formation, which illustrates that the method for manufacturing an interlayer liner of the present example can effectively suppress the formation of the interlayer scale during the enameling process.
Example 2
The preparation method of the interlayer liner of the embodiment is basically the same as that of the embodiment 1, and is different in that in the spraying treatment of the aqueous solution of borax in the step 2), the aqueous solution of borax with the mass concentration of 6% and the temperature of 55 ℃ is used for spraying the outer layer steel plate and the inner layer steel plate.
The interlayer liner of the present embodiment was cut to see if oxide scale was formed on the surface of the interlayer.
Fig. 2 is a graph showing the effect of the interlayer oxidation resistance of the interlayer liner of example 2, and it can be seen from a comparison between fig. 2 and fig. 1 that the interlayer liner of this example has almost no scale formation, and it is described that the formation of the interlayer scale during the enameling process can be more effectively suppressed by an appropriate temperature of the borax aqueous solution.
Example 3
The preparation method of the sandwich liner of the embodiment is basically the same as that of the embodiment 1, and the difference is that in the drying treatment of the step 3), the drying temperature is 152 ℃, and the drying time is 164 s.
The interlayer liner of the present embodiment was cut to see if oxide scale was formed on the surface of the interlayer.
Fig. 3 is a graph showing the effect of the interlayer oxidation resistance of the interlayer liner of example 3, and it can be seen from a comparison between fig. 3 and fig. 1 that the scale in the interlayer liner of this example is more abundant than that in example 1, and the method for manufacturing the interlayer liner of this example is explained to effectively suppress the generation of the scale, but the drying temperature and time after the boron sand aqueous solution rinsing treatment have a certain influence on the interlayer oxidation resistance.
Example 4
The preparation method of the interlayer liner of the embodiment is basically the same as the embodiment 1, and is different from the step 5), wherein in the enameling treatment, the enameling drying temperature is 120 ℃, and the enameling drying time is 25 min; the enameling temperature is 845 ℃, and the enameling time is 30 min.
The interlayer liner of the present embodiment was cut to see if oxide scale was formed on the surface of the interlayer.
Fig. 4 is a graph showing the effect of the interlayer oxidation resistance of the interlayer liner of example 4, and it can be seen from a comparison between fig. 4 and fig. 1 that the scale in the interlayer liner of this example is larger than that in example 1, and that the burning and enameling process has a certain influence on the formation of the scale.
Comparative example 1
This comparative example is substantially the same as example 1, except that the comparative example does not undergo the spraying treatment of step 2).
The interlayer liner of the comparative example was cut to see if oxide scale was formed on the surface of the interlayer.
Fig. 5 is a graph showing the effect of the interlayer oxidation resistance of the interlayer liner of comparative example 1, and it can be seen from an observation of fig. 5 that a large amount of black layer scale is formed in the interlayer liner of this comparative example, and it is described that the spraying treatment with borax is effective for suppressing the formation of scale.
Comparative example 2
The comparative example is basically the same as the example 1, except that the steel plate material of a unit area is uniformly treated by 30ml of borax water solution with the mass concentration of 6% by adjusting the spraying flow rate and the spraying time in the spraying treatment.
When the sandwich liner of the comparative example was cut, it was observed that a certain amount of black layer scale was present in the sandwich liner, although less than that in comparative example 1, there was also a possibility of blocking the circulation line.
Comparative example 3
The preparation method of the interlayer liner of the comparative example comprises the following steps:
1) cleaning treatment
Same as example 1;
2) welding process
Welding the outer layer steel plate and the inner layer steel plate to form a structure of the interlayer liner;
3) soaking treatment
Soaking the interlayer liner in 28 deg.C borax water solution with mass concentration of 6% for 22 s;
4) drying process
Same as example 1;
5) enameling treatment
Same as in example 1.
The interlayer liner of the present embodiment was cut to see if oxide scale was formed on the surface of the interlayer.
Fig. 6 is an effect diagram of the interlayer oxidation resistance of the interlayer liner in the comparative example 3, and it can be seen from the comparison between fig. 6 and fig. 1 that a certain amount of black layer-shaped oxide scale is generated in the interlayer liner of the comparative example, although the amount of black layer-shaped oxide scale is less than that of the oxide scale in the comparative example 1, the circulation pipeline may be blocked, and therefore, the leaching treatment of the steel plate material by directly using the aqueous solution of borax helps to maximally enhance the oxidation resistance of the interlayer.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.

Claims (8)

1. The preparation method of the sandwich liner is characterized by comprising the following steps:
1) respectively spraying the cleaned outer layer steel plate and the inner layer steel plate by using a borax water solution, and then drying;
2) welding the dried outer layer steel plate and the dried inner layer steel plate, and then carrying out burning and enameling treatment on the inner wall of the inner container formed by the inner layer steel plate to obtain the interlayer inner container;
in the spraying treatment, the spraying volume of the aqueous solution of the borax for the steel plate in unit area is 45-55 ml;
the mass concentration of the borax water solution is 5-8%;
the temperature of the borax water solution is 40-65 ℃;
the drying temperature is 120-160 ℃, and the drying time is 150-170 s;
the enamel firing temperature of the enamel firing treatment is 750-870 ℃, and the time is 30-35 min.
2. The method for preparing a sandwich liner according to claim 1, wherein the pressure of the spraying treatment is 0.45-0.65 Mpa.
3. The method of claim 1, wherein the cleaning process comprises: and (3) spraying the outer-layer steel plate and the inner-layer steel plate by using a cleaning agent, wherein the pH value of the cleaning agent is more than or equal to 10.
4. The preparation method of the interlayer liner according to claim 3, wherein the temperature of the cleaning agent is 50-70 ℃, and the cleaning time is 90-100 s.
5. The preparation method of the interlayer liner according to claim 3 or 4, wherein before the cleaning treatment, hot water rinsing treatment is further performed on the outer layer steel plate and the inner layer steel plate;
in the hot water leaching treatment, the water temperature is 50-70 ℃ and the time is 50-55 s.
6. The method for preparing the sandwich liner according to claim 1, wherein before the enameling, the method further comprises sanding the inner wall of the liner.
7. A sandwich liner, obtainable by the process according to any one of claims 1 to 6.
8. A solar water heater comprising the sandwich inner container of claim 7.
CN201910505583.6A 2019-06-12 2019-06-12 Interlayer liner and preparation method and application thereof Active CN112082278B (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101520246A (en) * 2009-03-25 2009-09-02 江苏光芒科技发展有限公司 Processing technique for liner of jacket of solar water heater
CN201954796U (en) * 2010-12-31 2011-08-31 孙传玲 Anti-corrosion overheating-proof pressure-bearing water tank for solar water heater
CN106400014A (en) * 2016-08-19 2017-02-15 施鹏程 Manufacturing process of enamel for lamp

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101520246A (en) * 2009-03-25 2009-09-02 江苏光芒科技发展有限公司 Processing technique for liner of jacket of solar water heater
CN201954796U (en) * 2010-12-31 2011-08-31 孙传玲 Anti-corrosion overheating-proof pressure-bearing water tank for solar water heater
CN106400014A (en) * 2016-08-19 2017-02-15 施鹏程 Manufacturing process of enamel for lamp

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