CN111899914A - Electrical-grade magnesium oxide powder for electric heating tube of steam generator and production method thereof - Google Patents
Electrical-grade magnesium oxide powder for electric heating tube of steam generator and production method thereof Download PDFInfo
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- CN111899914A CN111899914A CN202010741930.8A CN202010741930A CN111899914A CN 111899914 A CN111899914 A CN 111899914A CN 202010741930 A CN202010741930 A CN 202010741930A CN 111899914 A CN111899914 A CN 111899914A
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- Prior art keywords
- magnesium oxide
- oxide powder
- electric heating
- electrical
- heating tube
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- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 title claims abstract description 46
- 239000000395 magnesium oxide Substances 0.000 title claims abstract description 36
- 239000000843 powder Substances 0.000 title claims abstract description 30
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 title claims abstract description 26
- 238000005485 electric heating Methods 0.000 title claims abstract description 23
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 13
- 238000003763 carbonization Methods 0.000 claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000002210 silicon-based material Substances 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims abstract description 8
- 230000008569 process Effects 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 claims description 55
- 238000010438 heat treatment Methods 0.000 claims description 11
- 229920002545 silicone oil Polymers 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 8
- 229920002050 silicone resin Polymers 0.000 claims description 7
- 229910044991 metal oxide Inorganic materials 0.000 claims description 5
- 150000004706 metal oxides Chemical class 0.000 claims description 5
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 229910052909 inorganic silicate Inorganic materials 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 238000007711 solidification Methods 0.000 claims description 4
- 230000008023 solidification Effects 0.000 claims description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 3
- 229910052739 hydrogen Inorganic materials 0.000 claims description 3
- 239000001257 hydrogen Substances 0.000 claims description 3
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 claims description 3
- 239000000391 magnesium silicate Substances 0.000 claims description 3
- 229910052919 magnesium silicate Inorganic materials 0.000 claims description 3
- 235000019792 magnesium silicate Nutrition 0.000 claims description 3
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 claims description 3
- 239000010703 silicon Substances 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 claims description 2
- 239000000654 additive Substances 0.000 claims description 2
- 230000000996 additive effect Effects 0.000 claims description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 2
- 125000001797 benzyl group Chemical group [H]C1=C([H])C([H])=C(C([H])=C1[H])C([H])([H])* 0.000 claims description 2
- 238000007791 dehumidification Methods 0.000 claims description 2
- 125000000118 dimethyl group Chemical group [H]C([H])([H])* 0.000 claims description 2
- 238000009826 distribution Methods 0.000 claims description 2
- 238000004806 packaging method and process Methods 0.000 claims description 2
- 238000012216 screening Methods 0.000 claims description 2
- 238000007873 sieving Methods 0.000 claims description 2
- 150000004760 silicates Chemical class 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 claims description 2
- 229920001296 polysiloxane Polymers 0.000 claims 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 abstract description 9
- 239000012752 auxiliary agent Substances 0.000 abstract description 9
- 238000012360 testing method Methods 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 4
- 238000011049 filling Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 6
- 238000009413 insulation Methods 0.000 description 6
- 239000007789 gas Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
- H01B3/10—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances metallic oxides
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B19/00—Apparatus or processes specially adapted for manufacturing insulators or insulating bodies
Abstract
The invention discloses an electric-grade magnesium oxide powder for an electric heating tube of a water vapor generator and a production method thereof, and the final aim of moisture resistance and blackening resistance is achieved by adjusting the comprehensive use amount of an organic silicon material and an anti-carbonization auxiliary agent in the electric-grade magnesium oxide powder. The invention has the following beneficial effects: the electrical magnesium oxide powder has excellent fluidity and proper filling density by the proper grain size ratio of 40-325 meshes accounting for 95 percent, which is beneficial to the manufacture of electric heating tubes; by reasonably using the organic silicon material, the electrical-grade magnesium oxide powder has excellent moisture-proof insulating property after being made into the electric heating tube; through the reasonable use of the anti-carbonization auxiliary agent, the electric heating tube filled with the electrical-grade magnesium oxide powder can keep the magnesium powder from blackening and has good pressure resistance in the power-on test process.
Description
Technical Field
The invention relates to the field of magnesium oxide, in particular to an electrical grade magnesium oxide powder for an electric heating tube of a water vapor generator and a production method thereof.
Background
The electric-grade magnesia powder has excellent electric insulation and heat conduction performance, and is mainly used for manufacturing electric heating elements. The electric smelting magnesia sand is produced through crushing, size compounding, adding certain amount of assistant and physical and chemical treatment, and is used widely as insulating stuffing for electric heating element.
After the finished product is prepared, 6000 times of electrification-water spraying, namely cold cycle test is required, and the insulation (more than 1000M omega) and the voltage resistance (more than 1800V) meet the safety requirements.
As the main raw material of electrical-grade magnesia powder (hereinafter referred to as magnesium powder) for an electric heating tube of a water vapor generator, namely fused magnesia, the common electrical-grade magnesia powder in the market at present can solve the moisture-proof problem but cannot solve the problem of blackening of the magnesium powder by adding organosilicon materials under the condition that the electric heating tube is not sealed; on the contrary, the organic silicon material is not added, so that the problem of blackening of the magnesium powder is solved, but the moisture-proof problem cannot be solved, and the two can not be compatible.
According to the invention, the moisture-proof problem is solved by properly adding the organosilicon material into the electrical-grade magnesium oxide powder, and on the basis, the inorganic anti-carbonization auxiliary agent is added to solve the problem of blackening of the magnesium powder, so that the final household appliance (water vapor generator) has performance guarantee.
Disclosure of Invention
The invention aims to provide a production method of electrical-grade magnesium oxide powder for an electric heating tube of a water vapor generator, which aims to solve the technical problem commonly existing in the current product in the industry.
The technical problem solved by the invention can be realized by adopting the following technical scheme:
a production method of electrical-grade magnesium oxide powder for an electric heating tube of a water vapor generator is characterized by comprising the following steps:
the method comprises the following steps: crushing and screening the fused magnesia blocks to prepare fused magnesia with the particle size distribution of 40-325 meshes, and marking as a material A;
step two: preparing an inorganic anti-carbonization auxiliary material into a uniform powdery additive, and marking as a material B;
step three: preparing an organic silicon material into a uniform solution, and marking as a material C;
step four: mixing the material B and the material A in a mixer according to the proportion of 1.5-3.0 wtwt% for 5-20 minutes to ensure that the materials are fully and uniformly mixed, and marking as a material D;
step five: performing high-temperature heat treatment, namely placing the material D obtained in the step four in a kiln at 800-110 ℃ for high-temperature dehumidification treatment, heating for 1-2 hours, taking the material out of the kiln after the high-temperature treatment, and cooling the material to less than 50 ℃ by using a natural cooling device to obtain a material E;
step six: surface coating treatment, namely coating the powder surface with an organic silicon solution: mixing the material C and the material E in a mixer (atomizing and spraying) for 15-30 minutes according to the proportion of 0.2-0.35 wtwt%, so that the materials are fully and uniformly coated on the surfaces of magnesium oxide particles, and the obtained material is marked as a material F;
step seven: and (3) carrying out heat treatment again, namely curing the organic silicon: placing the material F in a kiln at 200-280 ℃ for solidification, heating for solidification and staying for 0.5-2.0 hours, taking the solidified material out of the kiln, and cooling the solidified material to less than 50 ℃ by a natural cooling device to obtain a material G;
step eight: sieving and packaging the material G by a 40-mesh sieve to obtain the electrical grade magnesium oxide powder for the electric heating tube of the water vapor generator prepared by the invention.
The inorganic anti-carbonization auxiliary material is one or a combination of more of inorganic silicate or metal oxide, and can be: alumina, aluminum silicate, magnesium silicate, zirconia, zirconium silicate and other silicates or metal oxides, and combinations of one or more of the above. From the aspects of technical process and economy, the formulation of the inorganic silicate or metal oxide material is a very important basis for the design of the redox interaction of the electrical-grade magnesium oxide powder in the process of electrifying.
The organic silicon material is one or more of silicone oil and silicone resin, and can be: one or more of hydrogen-containing silicone oil, dimethyl silicone oil, benzyl silicone oil, methyl silicone resin and solid silicone resin. The heating and curing modes used in the sixth step and the seventh step can be electric heating, direct heating by a diesel oil or gas spray gun, and the gas heating can realize relatively low cost and is convenient for mass operation in the aspect of economy.
The basic principle on which the present invention is based is that:
the final aim of moisture resistance and blackening resistance is achieved by adjusting the comprehensive use amount of the organosilicon material and the anti-carbonization auxiliary agent in the electrical-grade magnesium oxide powder.
The invention has the following beneficial effects:
1. the electrical magnesium oxide powder has excellent fluidity and proper filling density by the proper grain size ratio of 40-325 meshes accounting for 95 percent, which is beneficial to the manufacture of electric heating tubes;
2. by reasonably using the organic silicon material, the electrical-grade magnesium oxide powder has excellent moisture-proof insulating property after being made into the electric heating tube;
3. through the reasonable use of the anti-carbonization auxiliary agent, the electric heating tube filled with the electrical-grade magnesium oxide powder can keep the magnesium powder from blackening and has good pressure resistance in the power-on test process.
Detailed Description
The using effect of different adding amounts is tested, and an actual using environment simulation test of 6000 cold and hot cycles is carried out, and the results are as follows:
1. moisture-proof effect
The moisture-proof auxiliary agent organosilicon material is 0.10 wt%, 0.15 wt%, 0.20 wt%, 0.25 wt%, 0.30 wt% and 0.35 wt%, and as a result, the moisture-proof performance requirement of the magnesium powder can be met with the consistent effect of 0.20 wt% to 0.35 wt%, and the ideal amount of 0.20 wt% is finally selected for the consideration of economy and reducing the content of carbon elements. The specific auxiliary used was a combination of 0.05 wt% methyl silicone resin and 0.15 wt% hydrogen-containing silicone oil.
2. Anti-carbonization (blackening of magnesium powder) effect
The dosage of the inorganic anti-carbonization auxiliary agent is 0.5 wt%, 1.0 wt%, 1.5 wt%, 2.0 wt%, 2.5 wt% and 3.0 wt%, and as a result, the effect of 1.5 wt% to 3.0 wt% is consistent and can meet the requirement of the anti-carbonization blackening performance of the magnesium powder, and for economic consideration, the ideal dosage of 2.0 wt% is finally selected. The specific auxiliary agent is an anti-carbonization material combination of 1 wt% of magnesium silicate and 1 wt% of aluminum oxide.
The improvement effect is as follows: by adopting the technical scheme, the electrical grade magnesium oxide product obtained by the invention has good insulating and moisture-proof performance and greatly improved electric pressure-resistant strength performance, thereby achieving the purpose of improving the product quality of a water vapor generator (electric heating tube) which is a terminal product.
Description of the drawings: in the experiment of the scheme, the organic silicon material and the inorganic silicate anti-carbonization material with different addition amounts are used.
Powder (1) for electric heating tube of water vapor generator produced by using the invention#) And ordinary magnesium oxide powder (2)#) Comparing the performances (the electric melting magnesia powder has the same material and the auxiliary agent and the preparation method are different):
1. comparison of compressive strength properties:
2. 1000V high voltage insulation performance comparison (SM type super insulation meter):
3. the powder No. 1 is not blackened, the insulation and voltage resistance meet the requirements, the powder No. 2 is obviously blackened, and the insulation and voltage resistance do not meet the requirements.
The test criteria were in accordance with: the mechanical industry department's industry Standard of Electrical grade magnesium oxide JB/T8508-
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. A production method of electrical-grade magnesium oxide powder for an electric heating tube of a water vapor generator is characterized by comprising the following steps:
the method comprises the following steps: crushing and screening the fused magnesia blocks to prepare fused magnesia with the particle size distribution of 40-325 meshes, and marking as a material A;
step two: preparing an inorganic anti-carbonization auxiliary material into a uniform powdery additive, and marking as a material B;
step three: preparing an organic silicon material into a uniform solution, and marking as a material C;
step four: mixing the material B and the material A in a mixer according to the proportion requirement of 1.5-3.0 wt% for 5-20 minutes to ensure that the materials are fully and uniformly mixed, and marking as a material D;
step five: performing high-temperature heat treatment, namely placing the material D obtained in the step four in a kiln at 800-110 ℃ for high-temperature dehumidification treatment, heating for 1-2 hours, taking the material out of the kiln after the high-temperature treatment, and cooling the material to less than 50 ℃ by using a natural cooling device to obtain a material E;
step six: surface coating treatment, namely coating the surface of the powder with an organic silicon material: mixing the material C and the material E in a mixer (atomizing and spraying) for 15-30 minutes according to the proportion of 0.2-0.35 wt% to fully and uniformly coat the mixture on the surfaces of magnesium oxide particles, and marking the mixture as a material F;
step seven: and (3) carrying out heat treatment again, namely curing the organic silicon: placing the material F in a kiln at 200-280 ℃ for solidification, heating for solidification and staying for 0.5-2.0 hours, taking the solidified material out of the kiln, and cooling the solidified material to less than 50 ℃ by a natural cooling device to obtain a material G;
step eight: sieving and packaging the material G by a 40-mesh sieve to obtain the electrical grade magnesium oxide powder for the electric heating tube of the water vapor generator prepared by the invention.
2. The production method according to claim 1, wherein the inorganic anti-carbonization auxiliary material is one or more of inorganic silicate or metal oxide.
3. The production method according to claim 2, wherein the inorganic anti-carbonization auxiliary material is: alumina, aluminum silicate, magnesium silicate, zirconia, zirconium silicate and other silicates or metal oxides, and combinations of one or more of the above.
4. The method of claim 1, wherein the silicone material is one or more of silicone oil and silicone resin.
5. The production method as claimed in claim 4, the silicone material may be: one or more of hydrogen-containing silicone oil, dimethyl silicone oil, benzyl silicone oil, methyl silicone resin and solid silicone resin.
6. An electrical grade magnesium oxide powder for electric heating tubes of steam generators, prepared by the process of any one of claims 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010741930.8A CN111899914A (en) | 2020-07-29 | 2020-07-29 | Electrical-grade magnesium oxide powder for electric heating tube of steam generator and production method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010741930.8A CN111899914A (en) | 2020-07-29 | 2020-07-29 | Electrical-grade magnesium oxide powder for electric heating tube of steam generator and production method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN111899914A true CN111899914A (en) | 2020-11-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010741930.8A Pending CN111899914A (en) | 2020-07-29 | 2020-07-29 | Electrical-grade magnesium oxide powder for electric heating tube of steam generator and production method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111899914A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112646393A (en) * | 2020-12-23 | 2021-04-13 | 辽宁嘉顺科技有限公司 | Moisture-proof electrical-grade magnesium oxide powder and preparation method and application thereof |
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| CN102220034A (en) * | 2011-04-15 | 2011-10-19 | 上海实业振泰化工有限公司 | Rust prevention additive and manufacturing method of rust prevention high temperature magnesium oxide |
| CN103601441A (en) * | 2013-10-31 | 2014-02-26 | 德高（广州）建材有限公司 | Carbonization-resistant waterproof slurry |
| CN106116531A (en) * | 2016-06-17 | 2016-11-16 | 辽宁嘉顺化工科技有限公司 | Fused magnesium oxide powder prevention ferrum-chromium-aluminum blackout and anti-oxidation magnesium blackening agent for surface and preparation method thereof |
| CN106904891A (en) * | 2017-03-21 | 2017-06-30 | 新疆科能防水防护技术股份有限公司 | Carbonization preventing paint and preparation method thereof |
| CN107204213A (en) * | 2017-03-16 | 2017-09-26 | 营口松辽镁业有限公司 | A kind of production method of fused magnesium oxide powder |
| CN110615454A (en) * | 2019-04-18 | 2019-12-27 | 上海实业振泰化工有限公司 | Electrical-grade magnesium oxide powder for coffee making tube and production method thereof |
-
2020
- 2020-07-29 CN CN202010741930.8A patent/CN111899914A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102220034A (en) * | 2011-04-15 | 2011-10-19 | 上海实业振泰化工有限公司 | Rust prevention additive and manufacturing method of rust prevention high temperature magnesium oxide |
| CN103601441A (en) * | 2013-10-31 | 2014-02-26 | 德高（广州）建材有限公司 | Carbonization-resistant waterproof slurry |
| CN106116531A (en) * | 2016-06-17 | 2016-11-16 | 辽宁嘉顺化工科技有限公司 | Fused magnesium oxide powder prevention ferrum-chromium-aluminum blackout and anti-oxidation magnesium blackening agent for surface and preparation method thereof |
| CN107204213A (en) * | 2017-03-16 | 2017-09-26 | 营口松辽镁业有限公司 | A kind of production method of fused magnesium oxide powder |
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| CN110615454A (en) * | 2019-04-18 | 2019-12-27 | 上海实业振泰化工有限公司 | Electrical-grade magnesium oxide powder for coffee making tube and production method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112646393A (en) * | 2020-12-23 | 2021-04-13 | 辽宁嘉顺科技有限公司 | Moisture-proof electrical-grade magnesium oxide powder and preparation method and application thereof |
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Application publication date: 20201106 |