A terahertz feldspar ceramic coating heat exchange plate

Abstract

The present invention relates to the technical field of plate heat exchangers, in particular to the IPC F28D9 field, and more specifically, to a terahertz feldspar ceramic coating heat exchange plate. The terahertz feldspar ceramic coating heat exchange plate is formed by spraying terahertz ceramic paint on a stainless steel plate. The terahertz ceramic coating, by weight, comprises the following raw materials for preparation: 10-40 parts of terahertz feldspar minerals, 30-60 parts of silica sol, 2-10 parts of pigments, 2-10 parts of fillers, and 2-10 parts of functional additives. The terahertz feldspar ceramic coating heat exchange plate prepared by the present invention has a high far-infrared terahertz wave emissivity, greatly improves the heat exchange efficiency, and simultaneously produces a resonance effect on water molecules, improving the hydrogen bond network of water molecules.

Description

Technical Field

[0001] The present invention relates to the technical field of plate heat exchangers, in particular to the IPC F28D9 field, and more specifically, to a terahertz feldspar ceramic-coated heat exchange plate. Background Art

[0002] A heat exchange plate is an efficient heat exchanger. Due to its advantages such as small floor area, low price, and easy cleaning, it has been widely used in the fields of metallurgy, chemical industry, medicine, food, etc.

[0003] In the prior art, the patent application document with the authorization announcement number CN105526814B discloses a heat exchange plate, a pair of heat exchange plates, a plate group and a welded plate heat exchanger for a welded plate heat exchanger. By adding a transverse connecting part, while improving the heat exchange efficiency of the heat exchange plate, its service life is also improved, but the improvement of the heat exchange efficiency is limited.

[0004] The patent application document with the authorization announcement number CN104827178B discloses a manufacturing method of a heat exchange plate. After pre-treating a stainless steel plate and a copper plate, they are combined to form a heat exchange plate, so that the heat exchange plate can have strong heat transfer rate and certain corrosion resistance at the same time, but the improvement of its heat exchange efficiency is limited.

[0005] In the prior art, changing the structure of the heat exchange plate is mostly used to improve its performance, but the heat exchange efficiency is still low. Therefore, it is necessary to develop a heat exchange plate with a simple preparation method and high heat exchange efficiency. Summary of the Invention

[0006] To solve the above problems, in the first aspect of the present invention, a terahertz feldspar ceramic-coated heat exchange plate is provided, which is characterized in that it is sprayed on a stainless steel plate with terahertz ceramic paint.

[0007] The terahertz ceramic coating, by weight, its preparation raw materials include: 10-40 parts of terahertz feldspar minerals, 30-60 parts of silica sol, 2-10 parts of pigments, 2-10 parts of fillers, and 2-10 parts of functional additives.

[0008] Preferably, the terahertz feldspar mineral is one or more of potassium feldspar, sodium feldspar, plagioclase, and orthoclase.

[0009] Preferably, the silica content in the terahertz feldspar mineral is 50-80 wt%.

[0010] Preferably, the particle size of the terahertz feldspar mineral is ground to less than 0.5 μm.

[0011] Preferably, the terahertz feldspar mineral contains at least one of potassium, sodium, iron, phosphorus, calcium, magnesium, strontium, rubidium, niobium, and gallium.

[0012] The applicant unexpectedly found that by using a specific terahertz feldspar mineral as the main raw material of the terahertz ceramic coating described in this application, the prepared terahertz feldspar ceramic coating heat exchange plate has a high heat exchange rate. This may be because a mineral material with a high terahertz wave emissivity is used, and water molecules will generate a resonance effect and be activated in the nanoscale channels, greatly reducing the oxidation-reduction potential of water and generating a large number of ultra-small-sized nanobubbles, which has a strong effect on promoting cell proliferation and protecting cell telomeres. When applied to the heat exchange plate, it can emit terahertz waves, and the thermal radiation effect of the terahertz waves enables the heat exchange plate containing the terahertz feldspar mineral to have good heat exchange efficiency. However, the feldspar mineral has poor dispersibility and low adhesion in the coating, which affects the preparation of the heat exchange plate.

[0013] Preferably, the weight percentage of silicon dioxide in the silicon dioxide sol is 15-30%, and the particle size is 10-30 nm; more preferably, the weight percentage of silicon dioxide in the silicon dioxide sol is 30%, and the particle size is 10-15 nm.

[0014] In some preferred embodiments, the silicon dioxide sol is purchased from SS3015 produced by the supplier Baitexin Materials Co., Ltd.

[0015] The applicant unexpectedly found that by using a silicon dioxide sol with a weight percentage of silicon dioxide of 15-30% and a particle size of 10-30 nm, the terahertz feldspar mineral can be evenly dispersed in the system, thereby improving the stability of the terahertz ceramic coating. This may be because the specific silicon dioxide sol has a small particle size, a large specific surface area, and many silanol groups and hydroxyl groups on the surface layer, which can form a diffusion double layer together with the metal ions existing in the feldspar mineral, and the electrostatic interaction between the particles improves the stability of the system.

[0016] Preferably, the pigment is one or more of lithopone, titanium dioxide, pearlescent mica, cinnabar, and azurite; more preferably, it is titanium dioxide.

[0017] Preferably, the water dispersibility of the titanium dioxide is ≥70%, and the titanium dioxide content is ≥95%; more preferably, the water dispersibility of the titanium dioxide is ≥80%, and the titanium dioxide content is ≥98.5%.

[0018] In some preferred embodiments, the titanium dioxide is purchased from A-100 produced by the supplier Henan Dahutong Titanium Industry Co., Ltd.

[0019] Preferably, the filler is one or more of mica powder, silica powder, calcium carbonate, talc powder, barium sulfate, and kaolin; more preferably, it is calcium carbonate.

[0020] Preferably, the calcium carbonate is heavy calcium carbonate.

[0021] Preferably, the particle size of the heavy calcium carbonate is 300 - 1000 mesh, and the calcium carbonate content is ≥ 95%; more preferably, the particle size of the heavy calcium carbonate is 800 mesh, and the calcium carbonate content is ≥ 98%.

[0022] In some preferred embodiments, the heavy calcium carbonate is purchased from the heavy calcium carbonate produced by the supplier Shanghai Gaoquan Chemical Co., Ltd.

[0023] Preferably, the functional auxiliary agent is one or more of a film-forming auxiliary agent, a dispersant, an antifoaming agent, a plasticizer, a preservative, and a thickening agent; more preferably, it is a film-forming auxiliary agent and an antifoaming agent.

[0024] Preferably, the weight ratio of the film-forming auxiliary agent to the antifoaming agent is (1 - 2) : (1 - 2); more preferably, it is 1:1.

[0025] Preferably, the antifoaming agent is one or more of an organosilicon antifoaming agent, a mineral oil antifoaming agent, a polyoxyethylene antifoaming agent, an amide antifoaming agent, and a fatty acid antifoaming agent; more preferably, it is an organosilicon antifoaming agent.

[0026] Preferably, the organosilicon antifoaming agent is a polyether-modified organosilicon antifoaming agent.

[0027] In some preferred embodiments, the antifoaming agent is purchased from the ST2292 antifoaming agent produced by the supplier BASF Corporation in the United States.

[0028] Preferably, the film-forming auxiliary agent is one or more of an alcohol-based film-forming auxiliary agent, an alcohol ester-based film-forming auxiliary agent, an alcohol ether-based film-forming auxiliary agent, and an alcohol ether ester-based film-forming auxiliary agent; more preferably, it is an alcohol ester-based film-forming auxiliary agent.

[0029] Preferably, the alcohol ester-based film-forming auxiliary agent is dodecyl alcohol ester.

[0030] In some preferred embodiments, the dodecyl alcohol ester is purchased from the TEXANOL film-forming auxiliary agent produced by the supplier Eastman Chemical Company in the United States.

[0031] Preferably, the preparation method of the terahertz feldspar ceramic coating is as follows: Mix the raw materials according to the weight parts, grind and disperse them evenly to obtain it.

[0032] The second aspect of the present invention provides a preparation method of a terahertz feldspar ceramic coating heat exchange plate, and its steps are as follows:

[0033] It is formed by three coating processes of sandblasting, primer coating, and topcoat coating on the surface of the stainless steel sheet in sequence.

[0034] In some preferred embodiments, before spraying the terahertz feldspar ceramic coating, sandblasting and primer coating are carried out in sequence. By using specific coatings and spraying processes, the adhesion and flatness of the terahertz feldspar ceramic coating can be enhanced, and the stainless steel surface can be protected, increasing the service life of the feldspar ceramic-coated heat exchange plate.

[0035] Preferably, the stainless steel sheet is one of 304 food-grade stainless steel sheets and 316 food-grade stainless steel sheets.

[0036] Preferably, the thickness of the stainless steel sheet is 0.3 - 1.0 mm.

[0037] Preferably, the specific steps of the sandblasting process are as follows: spray quartz sand on the surface of the stainless steel sheet, with a spraying thickness of 1 - 5 mm, and bake at 70 - 90 °C for 60 - 80 min after spraying.

[0038] In some preferred embodiments, the quartz sand is purchased from the refined No. 7 sand produced by Fengyang Dongsheng Quartz Sand Co., Ltd.

[0039] Preferably, the specific steps of the primer coating process are as follows: after the sandblasting process is completed, spray epoxy sealant primer, with a spraying thickness of 80 - 120 μm, and bake at 50 - 70 °C for 30 - 60 min after spraying.

[0040] Preferably, the specific steps of the topcoat spraying process are as follows: after the primer coating process is completed, spray the terahertz feldspar ceramic coating, with a spraying thickness of 10 - 100 μm. After topcoat spraying, dry at 400 - 500 °C for 20 - 50 min, then keep at 60 - 100 °C for 0.5 - 2 h, and then keep at 150 - 250 °C for 10 - 30 min to obtain the terahertz feldspar ceramic-coated heat exchange plate.

[0041] The applicant unexpectedly found that when preparing the terahertz feldspar ceramic-coated heat exchange plate, through two medium and low temperature forming processes, while maintaining high heat exchange efficiency, the adhesion of the terahertz feldspar ceramic coating to the substrate can also be improved. This may be because the two different temperature forming processes can increase crosslinking while slowly increasing the melt viscosity, enabling the terahertz feldspar ceramic coating to level evenly while having certain adhesion and cohesion. If high temperature forming is used at the beginning, it may cause the powder particles in the coating not to have enough time to level, resulting in unevenness or peeling.

[0042] Beneficial effects:

[0043] 1. By selecting a specific terahertz feldspar mineral as the main raw material for the terahertz ceramic coating described in this application, the prepared terahertz feldspar ceramic-coated heat exchange plate has a high heat exchange rate.

[0044] 2. By selecting silica sol with a silica weight percentage of 15 - 30% and a particle size of 10 - 30 nm, the terahertz feldspar minerals can be evenly dispersed in the system, thereby improving the stability of the terahertz ceramic coating.

[0045] 3. By sandblasting and primer coating in sequence before spraying the terahertz feldspar ceramic coating, the adhesion and flatness of the terahertz feldspar ceramic coating can be enhanced, and the stainless - steel surface can also be protected, increasing the service life of the feldspar ceramic coating heat - exchange plate.

[0046] 4. When preparing the terahertz feldspar ceramic coating heat - exchange plate, through two - step medium - low - temperature forming, while maintaining high heat - exchange efficiency, the adhesion of the terahertz feldspar ceramic coating on the substrate can also be improved.

[0047] 5. The terahertz feldspar ceramic coating heat - exchange plate prepared by the present invention has a relatively high far - infrared terahertz wave emissivity, greatly improving the heat - exchange efficiency, and at the same time generating a resonance effect on water molecules, improving the hydrogen - bond network of water molecules.

[0048] 6. The terahertz feldspar ceramic coating heat - exchange plate prepared by the present invention can be applied to fields such as metallurgy, chemical industry, medicine, and food. Detailed implementation mode

[0049] Example

[0050] Example 1

[0051] Example 1 provides a terahertz feldspar ceramic coating heat - exchange plate, which is characterized in that it is sprayed on a stainless - steel sheet by terahertz ceramic coating.

[0052] The terahertz ceramic coating, by weight, its preparation raw materials include: 30 parts of terahertz feldspar minerals, 40 parts of silica sol, 5 parts of pigment, 5 parts of filler, and 5 parts of functional additives.

[0053] The terahertz feldspar mineral is potassium feldspar.

[0054] The silica content in the terahertz feldspar mineral is 64.7 wt%.

[0055] The particle size of the terahertz feldspar mineral is ground to 0.3 μm.

[0056] The weight percentage of silica in the silica sol is 30%, and the particle size is 10 - 15 nm.

[0057] The silica sol is purchased from SS3015 produced by supplier Baitexin Materials Co., Ltd.

[0058] The pigment is titanium dioxide.

[0059] The water dispersibility of the titanium dioxide is ≥80%, and the titanium dioxide content is ≥98.5%.

[0060] The titanium dioxide was purchased as A-100 produced by the supplier Henan Dahutong Titanium Industry Co., Ltd.

[0061] The filler is calcium carbonate.

[0062] The calcium carbonate is heavy calcium carbonate.

[0063] The particle size of the heavy calcium carbonate is 800 mesh, and the calcium carbonate content is ≥98%.

[0064] The heavy calcium carbonate was purchased as the heavy calcium carbonate produced by the supplier Shanghai Gaoquan Chemical Co., Ltd.

[0065] The functional additives are film-forming aids and defoamers.

[0066] The weight ratio of the film-forming aid to the defoamer is 1:1.

[0067] The defoamer is a silicone defoamer.

[0068] The silicone defoamer is a polyether-modified silicone defoamer.

[0069] The defoamer was purchased as the ST2292 defoamer produced by the supplier BASF Corporation, USA.

[0070] The film-forming aid is an alcohol ester film-forming aid.

[0071] The alcohol ester film-forming aid is dodecyl alcohol ester.

[0072] The dodecyl alcohol ester was purchased as the TEXANOL film-forming aid produced by the supplier Eastman Chemical Company, USA.

[0073] The preparation method of the terahertz feldspar ceramic coating is as follows: Mix the raw materials by weight, grind and disperse them evenly to obtain the product.

[0074] The second aspect of the present invention provides a preparation method of a terahertz feldspar ceramic coating heat exchange plate, and its steps are as follows:

[0075] It is formed by three coating processes of sandblasting, primer coating, and topcoat coating on the surface of the stainless steel sheet in sequence.

[0076] The stainless steel sheet is a 304 food-grade stainless steel sheet.

[0077] The thickness of the stainless steel sheet is 0.5 mm.

[0078] The specific steps of the sandblasting process are as follows: Spray quartz sand on the surface of the stainless steel sheet, the spraying thickness is 3 mm, and bake at 80 °C for 70 min after spraying.

[0079] The quartz sand is purchased from the refined No. 7 sand produced by Fengyang Dongsheng Quartz Sand Co., Ltd.

[0080] The specific steps of the primer coating process are as follows: After the sandblasting process, an epoxy sealing primer is sprayed with a spraying thickness of 100 μm, and then baked at 60 °C for 50 min after spraying.

[0081] The specific steps of the topcoat process are as follows: After the primer coating process, a terahertz feldspar ceramic coating is sprayed with a spraying thickness of 50 μm. After the topcoat is dried at 450 °C for 30 min, it is then maintained at 80 °C for 1 h and then maintained at 200 °C for 20 min to obtain a terahertz feldspar ceramic coating heat exchange plate.

[0082] Example 2

[0083] Example 2 provides a terahertz feldspar ceramic coating heat exchange plate. The specific implementation method is the same as that of Example 1, except that: the particle size of the terahertz feldspar mineral is ground to 1.0 μm.

[0084] Example 3

[0085] Example 3 provides a terahertz feldspar ceramic coating heat exchange plate. The specific implementation method is the same as that of Example 1, except that: the weight percentage of silicon dioxide in the silicon dioxide sol is 15%, and the particle size is 3 - 5 nm.

[0086] The silicon dioxide sol is purchased from SS1505 produced by the supplier Baite New Materials Co., Ltd.

[0087] Example 4

[0088] Example 4 provides a terahertz feldspar ceramic coating heat exchange plate. The specific implementation method is the same as that of Example 1, except that:

[0089] The second aspect of the present invention provides a preparation method of a terahertz feldspar ceramic coating heat exchange plate, and its steps are as follows:

[0090] It is formed by two coating processes of primer coating and topcoat coating on the surface of a stainless steel sheet in sequence.

[0091] Example 5

[0092] Example 5 provides a terahertz feldspar ceramic coating heat exchange plate. The specific implementation method is the same as that of Example 1, except that: the specific steps of the topcoat process are as follows: After the primer coating process, a terahertz feldspar ceramic coating is sprayed with a spraying thickness of 50 μm. After the topcoat is dried at 450 °C for 30 min, it is then maintained at 200 °C for 60 min to obtain a terahertz feldspar ceramic coating heat exchange plate.

[0093] Performance testing method

[0094] 1. Heat transfer efficiency

[0095] For the terahertz feldspar ceramic coating heat exchange plates prepared in Examples 1 - 5, refer to the national standard "Evaluation Method for Heat Transfer Efficiency of Plate Heat Exchanger Units" to measure their heat transfer efficiency, and record the results in Table 1.

[0096] 2. Adhesion

[0097] For the terahertz feldspar ceramic coating heat exchange plates prepared in Examples 1 - 5, according to GB9286, use the cross - cut method to test the adhesion of the products. An adhesion grade of 0 - 1 is considered qualified, and record the results in Table 1.

[0098] 3. Terahertz emissivity

[0099] For the terahertz feldspar ceramic coating heat exchange plates prepared in Examples 1 - 5, use a terahertz spectrometer to test their terahertz emissivity, and record the results in Table 1.

[0100] Table 1

[0101] Heat transfer efficiency / % Adhesion Terahertz emissivity Example 1 95.5 Qualified 0.99 Example 2 92.7 Unqualified 0.98 Example 3 95.1 Unqualified 0.97 Example 4 93.2 Unqualified 0.95 Example 5 94.3 Unqualified 0.96

Claims

1. A method for preparing a terahertz feldspar ceramic coated heat exchange plate, It is characterized in that Specifically, the terahertz ceramic coating is applied on the surface of the stainless steel plate through three coating processes: sandblasting, primer coating and top coating. The specific steps of the top coating process are: spraying terahertz feldspar ceramic coating after the primer process is completed, the spraying thickness is 10-100 μm, drying at 400-500° C. for 20-50 minutes after the top coating, then keeping at 60-100° C. for 0.5-2 hours, and then keeping at 150-250° C. for 10-30 minutes, so as to obtain a terahertz feldspar ceramic coated heat exchange plate; The coating is prepared by raw materials including, by weight: 10-40 parts of terahertz feldspar mineral, 30-60 parts of silica sol, 2-10 parts of pigment, 2-10 parts of filler, and 2-10 parts of functional additive; The terahertz feldspar mineral is one or more of potassium feldspar, albite, plagioclase, and orthoclase; The silicon oxide content in the terahertz feldspar mineral is 50-80wt%; The particle size of the terahertz feldspar mineral is ground to less than 0.5 μm; The weight percentage of silicon dioxide in the silicon dioxide sol is 15-30%, and the particle size is 10-30nm.

2. A method for preparing a terahertz feldspar ceramic coating heat exchange plate according to claim 1, It is characterized in that The pigment is one or more of lithopone, titanium dioxide, pearl mica, cinnabar, and azurite.

3. The method for preparing a terahertz feldspar ceramic coating heat exchange plate according to claim 2, It is characterized in that The filler is one or more of mica powder, silica powder, calcium carbonate, talc, barium sulfate and kaolin.

4. The method for preparing a terahertz feldspar ceramic coating heat exchange plate according to claim 3, It is characterized in that The functional additive is one or more of a film-forming additive, a dispersant, a defoamer, a plasticizer, a preservative, and a thickener.

5. The method for preparing a terahertz feldspar ceramic coating heat exchange plate according to claim 1, It is characterized in that The preparation method of the terahertz feldspar ceramic coating is as follows: raw materials are mixed by weight, ground and evenly dispersed to obtain the terahertz feldspar ceramic coating.

6. A terahertz feldspar ceramic coated heat exchange plate prepared according to the method for preparing a terahertz feldspar ceramic coated heat exchange plate according to any one of claims 1 to 5.