CN114804811A - Inorganic heat-conducting packaging material and preparation method and application thereof - Google Patents
Inorganic heat-conducting packaging material and preparation method and application thereof Download PDFInfo
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- CN114804811A CN114804811A CN202210586656.0A CN202210586656A CN114804811A CN 114804811 A CN114804811 A CN 114804811A CN 202210586656 A CN202210586656 A CN 202210586656A CN 114804811 A CN114804811 A CN 114804811A
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- 239000005022 packaging material Substances 0.000 title claims abstract description 42
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 claims abstract description 68
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 42
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 42
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims abstract description 42
- 239000000843 powder Substances 0.000 claims abstract description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 35
- 229910052943 magnesium sulfate Inorganic materials 0.000 claims abstract description 34
- 235000019341 magnesium sulphate Nutrition 0.000 claims abstract description 34
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 24
- 239000004816 latex Substances 0.000 claims abstract description 23
- 229920000126 latex Polymers 0.000 claims abstract description 23
- 238000002156 mixing Methods 0.000 claims abstract description 22
- 238000002425 crystallisation Methods 0.000 claims abstract description 18
- 230000008025 crystallization Effects 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 9
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 8
- 238000005485 electric heating Methods 0.000 claims abstract description 7
- 238000003756 stirring Methods 0.000 claims description 39
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 18
- 239000000463 material Substances 0.000 claims description 18
- 239000006185 dispersion Substances 0.000 claims description 16
- 239000000725 suspension Substances 0.000 claims description 15
- 239000007788 liquid Substances 0.000 claims description 14
- 239000010445 mica Substances 0.000 claims description 13
- 229910052618 mica group Inorganic materials 0.000 claims description 13
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 12
- 239000002245 particle Substances 0.000 claims description 12
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 claims description 7
- 239000000377 silicon dioxide Substances 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 5
- 239000000378 calcium silicate Substances 0.000 claims description 5
- 229910052918 calcium silicate Inorganic materials 0.000 claims description 5
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 claims description 5
- 239000010439 graphite Substances 0.000 claims description 5
- 229910002804 graphite Inorganic materials 0.000 claims description 5
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 5
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 5
- 238000004806 packaging method and process Methods 0.000 claims description 4
- 239000011230 binding agent Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims 1
- 230000008569 process Effects 0.000 abstract description 6
- 238000005054 agglomeration Methods 0.000 abstract description 2
- 230000002776 aggregation Effects 0.000 abstract description 2
- 150000001875 compounds Chemical class 0.000 abstract description 2
- 238000009833 condensation Methods 0.000 abstract description 2
- 230000005494 condensation Effects 0.000 abstract description 2
- 239000008204 material by function Substances 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 16
- 239000000203 mixture Substances 0.000 description 10
- WSFSSNUMVMOOMR-UHFFFAOYSA-N formaldehyde Natural products O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 6
- 239000001301 oxygen Substances 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000011259 mixed solution Substances 0.000 description 5
- 238000009210 therapy by ultrasound Methods 0.000 description 5
- 150000003839 salts Chemical class 0.000 description 4
- GARPJQVATFLXFO-UHFFFAOYSA-L S(=O)(=O)([O-])[O-].[Mg+2].[O-2].[Mg+2] Chemical compound S(=O)(=O)([O-])[O-].[Mg+2].[O-2].[Mg+2] GARPJQVATFLXFO-UHFFFAOYSA-L 0.000 description 3
- YWPOLRBWRRKLMW-UHFFFAOYSA-M sodium;naphthalene-2-sulfonate Chemical compound [Na+].C1=CC=CC2=CC(S(=O)(=O)[O-])=CC=C21 YWPOLRBWRRKLMW-UHFFFAOYSA-M 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 2
- 238000001354 calcination Methods 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 229920005570 flexible polymer Polymers 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000003469 silicate cement Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/30—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing magnesium cements or similar cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
- C04B2201/32—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The invention belongs to the technical field of inorganic functional materials. The invention provides an inorganic heat-conducting packaging material which comprises 630-670 parts of magnesium oxide, 120-180 parts of magnesium sulfate, 60-95 parts of a network forming agent, 5-25 parts of a crystallization auxiliary agent, 3-20 parts of a beta-sodium naphthalene sulfonate formaldehyde condensation compound, 0-15 parts of latex powder and 300-350 parts of water. According to the invention, through the matching of the components, the heat conductivity coefficient of the packaging material is obviously improved, and the packaging material has excellent fluidity and good adaptability to a system, is easy to fill and seal an electric heating system, and is not easy to deform after being solidified. The invention also provides a preparation method of the inorganic heat-conducting packaging material, which adopts a step-by-step mixing process to uniformly disperse various components, has low process requirement, does not generate the phenomenon of agglomeration and layering, and has simple, quick and convenient preparation method and good economy.
Description
Technical Field
The invention relates to the technical field of inorganic functional materials, in particular to an inorganic heat-conducting packaging material and a preparation method and application thereof.
Background
The electric heating rod has wide application range in daily life. However, the electrical heating rod is very sensitive to water and oxygen erosion, and a trace amount of water and oxygen can cause oxidation, crystallization or electrode degradation of organic materials in the device, thereby affecting the service life of the device and even directly causing the device to be damaged. Compared with glass substrates, most flexible polymer substrates have high water-oxygen permeability, which is not enough to ensure long-term reliable operation of devices, so that a high-barrier packaging material for water and oxygen is needed. A large part of electric energy of the electric heating rod is converted into heat energy, the existing packaging material is only considered from the aspect of improving the water and oxygen barrier performance, and the heat dissipation problem of the device is ignored, so that the heat of the device is continuously accumulated in the working process, the temperature is gradually increased, the degradation rate of the device material is accelerated, even the tube explosion phenomenon occurs, and the service life of the device is shortened. Therefore, how to improve the existing packaging material, which has high barrier property to water and oxygen and also has good heat conduction and heat dissipation performance, is a problem to be solved urgently.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides an inorganic heat-conducting packaging material and a preparation method and application thereof.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides an inorganic heat-conducting packaging material which is prepared from the following components in parts by mass:
630-670 parts of magnesium oxide, 120-180 parts of magnesium sulfate, 60-95 parts of a network forming agent, 5-25 parts of a crystallization auxiliary agent, 3-20 parts of a beta-sodium naphthalenesulfonate formaldehyde condensate, 0-15 parts of latex powder and 300-350 parts of water.
Preferably, the network forming agent comprises mica powder and a base material, and the mass ratio of the mica powder to the base material is 1.5-3: 4 to 7.
Preferably, the particle size of the mica powder is less than or equal to 1250 meshes; the specific surface area of the base material is more than or equal to 10m 2 /g；
The base material is silicon carbide or graphite.
Preferably, the crystallization aid comprises one or more of citric acid, calcium silicate, silica and calcium aluminate;
the specific surface area of the crystallization aid is more than or equal to 10m 2 And the particle size of the latex powder is less than or equal to 500 mu m.
The invention also provides a preparation method of the packaging material, which comprises the following steps:
(1) mixing magnesium sulfate and first part of water to obtain magnesium sulfate solution;
(2) mixing a network forming agent, latex powder, a first part of magnesium oxide, a beta-sodium naphthalene sulfonate formaldehyde condensate and the rest of water to obtain a suspension dispersion liquid;
(3) and mixing the magnesium sulfate solution, the suspension dispersion liquid, the residual magnesium oxide and the crystallization auxiliary agent to obtain the inorganic heat-conducting packaging material.
Preferably, the mass of the first part of water in the step (1) is 75-80% of the mass of water.
Preferably, the mass of the first part of magnesium oxide in the step (2) is 0.149-0.159% of the mass of magnesium oxide.
Preferably, the mixing mode in the step (2) is ultrasonic, the temperature of the ultrasonic is 18-30 ℃, the time of the ultrasonic is 30-50 min, and the frequency of the ultrasonic is more than or equal to 25 KHz.
Preferably, the mixing mode in the step (3) is slow stirring and rapid stirring which are carried out in sequence;
the speed of the slow stirring is 120-150 rpm, and the time of the slow stirring is 120-150 s;
the speed of the rapid stirring is 260-300 rpm, and the time of the rapid stirring is 120-150 s;
the interval time between the slow stirring and the fast stirring is 30-40 s.
The invention also provides application of the packaging material in electric heating system packaging.
The invention provides an inorganic heat-conducting packaging material which comprises magnesium oxide, magnesium sulfate, a network forming agent, a crystallization auxiliary agent, latex powder, a beta-sodium naphthalenesulfonate formaldehyde condensation compound and water. In the research process, the invention discovers that the packaging material without adding the latex powder can meet the packaging requirements, and the performance of the packaging material after adding the latex powder is comprehensively improved because the latex powder is dispersed to form a film to be used as an adhesive to play a reinforcing role, but after the addition of the latex powder is too large, the heat conductivity coefficient is sharply reduced, and heat cannot be transferred. According to the invention, through the matching of the components, the heat conductivity coefficient of the packaging material is obviously improved, and the packaging material has excellent fluidity and good adaptability to a system, is easy to fill and seal an electric heating system, and is not easy to deform after being solidified. The invention also provides a preparation method of the inorganic heat-conducting packaging material, which adopts a step-by-step mixing process to uniformly disperse various components, has low process requirement, does not generate the phenomenon of agglomeration and layering, and has simple, quick and convenient preparation method and good economy.
Detailed Description
The invention provides an inorganic heat-conducting packaging material which is prepared from the following components in parts by mass:
630-670 parts of magnesium oxide, 120-180 parts of magnesium sulfate, 60-95 parts of a network forming agent, 5-25 parts of a crystallization auxiliary agent, 3-20 parts of a beta-sodium naphthalenesulfonate formaldehyde condensate, 0-15 parts of latex powder and 300-350 parts of water.
In the invention, the magnesium oxide is 630-670 parts, preferably 640-660 parts, and more preferably 645-655 parts.
In the invention, the magnesium oxide is calcined before use, and the calcination temperature is preferably 750-850 ℃, more preferably 760-840 ℃, and more preferably 780-820 ℃; the calcination time is preferably not less than 60min, more preferably not less than 80min, and still more preferably not less than 100 min; the activity of the magnesium oxide is preferably 55% or more, more preferably 60% or more, and still more preferably 65% or more.
In the invention, the magnesium sulfate is 120-180 parts, preferably 130-170 parts, and more preferably 140-160 parts.
According to the invention, the needle-shaped hydrated magnesium oxide-magnesium sulfate double salt is generated by reacting magnesium oxide and magnesium sulfate in the solution, and the needle-shaped double salt is filled in the gap, so that the compactness of the system is increased, and the heat conduction is more uniform.
In the present invention, the network forming agent is 60 to 95 parts, preferably 65 to 90 parts, and more preferably 70 to 85 parts.
In the invention, the network forming agent preferably comprises mica powder and a base material, and the mass ratio of the mica powder to the base material is preferably 1.5-3: 4 to 7, and more preferably 2 to 2.5: 5-6, more preferably 2.2-2.3: 5.4 to 5.6.
In the present invention, the particle size of the mica powder is preferably 1250 mesh or less, more preferably 1300 mesh or less, and still more preferably 1350 mesh or less; the specific surface area of the base material is preferably 10m or more 2 (iv)/g, more preferably 12m or more 2 Per g, morePreferably 14m or more 2 /g。
In the present invention, the binder is preferably silicon carbide or graphite.
In the invention, the network forming agent is composed of superfine powder with high heat conductivity coefficient, the powder is uniformly distributed in the heat-conducting cementing material to generate a heat bridge network, and simultaneously, the hydration product of the cementing material grows directionally to form a high-speed heat-conducting channel.
In the invention, the crystallization aid is 5-25 parts, preferably 10-20 parts, and more preferably 14-16 parts.
In the present invention, the crystallization aid preferably comprises one or more of citric acid, calcium silicate, silica and calcium aluminate.
In the present invention, the crystallization aid preferably has a specific surface area of 10m or more 2 (iv)/g, more preferably 12m or more 2 G, more preferably not less than 14m 2 (ii)/g; the particle size of the latex powder is preferably less than or equal to 500 μm, more preferably less than or equal to 400 μm, and even more preferably less than or equal to 300 μm.
In the present invention, the crystallization aid provides a crystal nucleus for the formation of the hydrated magnesium oxide-magnesium sulfate double salt, on the one hand, and helps to keep the hydrated magnesium oxide-magnesium sulfate double salt in a whisker shape, on the other hand.
In the invention, the beta-sodium naphthalenesulfonate formaldehyde condensate is 3-20 parts, preferably 5-15 parts, and more preferably 8-12 parts.
In the invention, the beta-sodium naphthalenesulfonate formaldehyde condensate can improve the dispersion uniformity of the network forming agent in the liquid phase, and simultaneously, the gelled material slurry has extremely high fluidity, thereby being beneficial to pouring and densifying the heat-conducting gelled material in the protective sleeve and improving the heat conductivity coefficient of the heat-conducting material.
In the invention, the latex powder is 0-15 parts, preferably 5-10 parts, and more preferably 7-8 parts.
In the present invention, the amount of the water is 300 to 350 parts, preferably 310 to 340 parts, and more preferably 320 to 330 parts.
The invention also provides a preparation method of the packaging material, which comprises the following steps:
(1) mixing magnesium sulfate and first part of water to obtain magnesium sulfate solution;
(2) mixing a network forming agent, latex powder, a first part of magnesium oxide, a beta-sodium naphthalene sulfonate formaldehyde condensate and the rest of water to obtain a suspension dispersion liquid;
(3) and mixing the magnesium sulfate solution, the suspension dispersion liquid, the residual magnesium oxide and the crystallization auxiliary agent to obtain the inorganic heat-conducting packaging material.
In the invention, the mass of the first part of water in the step (1) is preferably 75-80%, more preferably 76-79%, and even more preferably 77-78% of the mass of water.
In the present invention, the mixing in the step (1) is not particularly limited, and magnesium sulfate may be dissolved.
In the present invention, the mass of the first part of magnesium oxide in the step (2) is preferably 0.149 to 0.159%, more preferably 0.150 to 0.158%, and still more preferably 0.152 to 0.156% of the mass of magnesium oxide.
In the invention, the mixing mode in the step (2) is preferably ultrasonic, and the ultrasonic temperature is preferably 18-30 ℃, more preferably 20-28 ℃, and more preferably 22-26 ℃; the ultrasonic treatment time is preferably 30-50 min, more preferably 35-45 min, and even more preferably 38-42 min; the frequency of the ultrasonic wave is preferably equal to or higher than 25KHz, more preferably equal to or higher than 30KHz, and even more preferably equal to or higher than 35 KHz.
In the present invention, the mixing in the step (3) is preferably performed by slow stirring and fast stirring which are performed sequentially.
In the present invention, the remaining magnesium oxide and the crystallization aid are mixed and added to the mixed solution of the suspension dispersion and the magnesium sulfate solution and then stirring is started.
In the invention, the speed of the slow stirring is preferably 120-150 rpm, more preferably 130-140 rpm, and more preferably 134-136 rpm; the slow stirring time is preferably 120-150 s, more preferably 130-140 s, and even more preferably 134-136 s.
In the invention, the speed of the rapid stirring is preferably 260-300 rpm, more preferably 270-290 rpm, and more preferably 275-285 rpm; the time for rapid stirring is preferably 120-150 s, more preferably 130-140 s, and even more preferably 134-136 s.
In the invention, the interval time between the slow stirring and the fast stirring is preferably 30-40 s, more preferably 32-38 s, and even more preferably 34-36 s.
The invention also provides application of the packaging material in electric heating system packaging.
The technical solutions provided by the present invention are described in detail below with reference to examples, but they should not be construed as limiting the scope of the present invention.
Example 1
123g of magnesium sulfate, 68.8g of a network forming agent, 632g of magnesium oxide, 7.3g of citric acid, 5g of a sodium beta-naphthalenesulfonate formaldehyde condensate, 14.3g of latex powder and 335g of water were weighed.
Wherein, the magnesium oxide is calcined for 80min at the temperature of 800 ℃ before use, and the activity of the magnesium oxide is 65%; in the network forming agent, the mass of mica powder is 25.8g, and the particle size is 1300 meshes; the mass of the silicon carbide was 43g, and the specific surface area was 12m 2 (iv) g; the specific surface area of citric acid is 12m 2 (ii)/g; the particle size of the latex powder is 400 mu m.
Magnesium sulfate was dissolved in 268g of water to obtain a magnesium sulfate solution; carrying out ultrasonic treatment on a network forming agent, latex powder, 1g of magnesium oxide, a beta-sodium naphthalene sulfonate formaldehyde condensate and the rest water for 40min at the temperature of 25 ℃ and the frequency of 30KHz to obtain a suspension dispersion liquid; and mixing the rest magnesium oxide and citric acid, adding the mixture into the mixed solution of the suspension dispersion liquid and the magnesium sulfate solution, stirring at the rotating speed of 140rpm for 130s, pausing for 35s after the stirring is finished, and stirring at the rotating speed of 280rpm for 130s to prepare the inorganic heat-conducting packaging material.
Pouring the obtained packaging material into
The mold was vibrated 13 times, and the film was coated and cured at room temperature for 24 hours to release the mold, to obtain sample 1, and the test results of sample 1 are shown in table 1.
Example 2
178.5g of magnesium sulfate, 83g of network former, 659.9g of magnesium oxide, 24g of calcium aluminate, 18g of sodium beta-naphthalenesulfonate formaldehyde condensate and 308.7g of water were weighed out.
Wherein, the magnesium oxide is calcined for 100min at the temperature of 830 ℃ before use, and the activity of the magnesium oxide is 60 percent; in the network forming agent, the mass of mica powder is 18g, and the particle size is 1350 meshes; the mass of the silicon carbide was 65g, and the specific surface area was 10m 2 (ii)/g; the specific surface area of the calcium aluminate is 12m 2 /g。
Magnesium sulfate was dissolved in 242g of water to obtain a magnesium sulfate solution; carrying out ultrasonic treatment on a network forming agent, 1g of magnesium oxide, a beta-sodium naphthalene sulfonate formaldehyde condensate and the rest water for 30min at the temperature of 18 ℃ and the frequency of 25KHz to obtain a suspension dispersion liquid; and mixing the rest magnesium oxide and calcium aluminate, adding the mixture into the mixed solution of the suspension dispersion liquid and the magnesium sulfate solution, stirring the mixture for 150 seconds at the rotating speed of 120rpm, pausing the stirring for 40 seconds after the stirring is finished, and stirring the mixture for 130 seconds at the rotating speed of 260rpm to obtain the inorganic heat-conducting packaging material.
Pouring the obtained packaging material into
The mold was vibrated 15 times, and the film was coated and cured at room temperature for 24 hours to release the mold, to obtain sample 2, and the test results of sample 2 are shown in table 1.
Example 3
178g of magnesium sulfate, 82g of network forming agent, 664g of magnesium oxide, 23g of silicon dioxide, 13g of beta-sodium naphthalenesulfonate formaldehyde condensate, 2g of latex powder and 310g of water are weighed.
Wherein, the magnesium oxide is calcined for 60min at the temperature of 750 ℃ before use, and the activity of the magnesium oxide is 60 percent; in the network forming agent, the mass of mica powder is 24.6g, and the particle size is 1300 meshes; the mass of graphite was 57.4g, and the specific surface area was 15m 2 (ii)/g; the specific surface area of the silica was 14m 2 (ii)/g; the particle size of the latex powder is 300 mu m.
Magnesium sulfate was dissolved in 241.8g of water to obtain a magnesium sulfate solution; carrying out ultrasonic treatment on a network forming agent, latex powder, 1g of magnesium oxide, a beta-sodium naphthalene sulfonate formaldehyde condensate and the rest water for 50min at the temperature of 30 ℃ and the frequency of 35KHz to obtain a suspension dispersion liquid; and mixing the rest magnesium oxide and silicon dioxide, adding the mixture into the mixed solution of the suspension dispersion liquid and the magnesium sulfate solution, stirring the mixture for 120s at the rotating speed of 150rpm, pausing for 30s after the stirring is finished, and stirring the mixture for 140s at the rotating speed of 280rpm to prepare the inorganic heat-conducting packaging material.
Pouring the obtained packaging material into
The mold was vibrated 10 times, and the film was coated and cured at room temperature for 24 hours to release the mold, to obtain a sample 3, and the test results of the sample 3 are shown in table 1.
Example 4
177g of magnesium sulfate, 65g of network former, 645g of magnesium oxide, 18g of calcium silicate, 12g of sodium beta-naphthalenesulfonate formaldehyde condensate and 344.5g of water are weighed out.
Wherein, the magnesium oxide is calcined for 85min at 760 ℃ before use, and the activity of the magnesium oxide is 65%; in the network forming agent, the mass of mica powder is 16.25g, and the particle size is 1300 meshes; the mass of graphite was 48.75g, and the specific surface area was 12m 2 (ii)/g; the specific surface area of the calcium silicate is 16m 2 /g。
Magnesium sulfate was dissolved in 258.375g of water to obtain a magnesium sulfate solution; carrying out ultrasonic treatment on a network forming agent, 1g of magnesium oxide, a beta-sodium naphthalene sulfonate formaldehyde condensate and the rest water for 40min at 23 ℃ under the condition of 40KHz to obtain a suspension dispersion liquid; and mixing the rest magnesium oxide and calcium aluminate, adding the mixture into the mixed solution of the suspension dispersion liquid and the magnesium sulfate solution, stirring the mixture for 120s at the rotating speed of 150rpm, pausing the stirring for 40s after the stirring is finished, and stirring the mixture for 120s at the rotating speed of 280rpm to obtain the inorganic heat-conducting packaging material.
Pouring the obtained packaging material into
The mold was vibrated 15 times, and the film was coated and cured at room temperature for 24 hours to release the mold, to obtain a sample 4, and the test results of the sample 4 are shown in table 1.
Comparative example 1
The comparative example is different from example 1 in that 17 parts of latex powder is added, the remaining parameters are unchanged, the obtained material is cast and cured according to the steps of example 1 to obtain a sample 5, and the test results of the sample 5 are recorded in table 1.
TABLE 1 test results record Table
The above embodiments show that the inorganic heat-conducting packaging material provided by the invention has excellent heat-conducting property, and compared with a silicate cement-based cementing material (the heat-conducting coefficient is 0.8-1.5W/m.K), the heat-conducting packaging material provided by the invention has the heat-conducting coefficient of 5.16W/m.K; the heat-conducting packaging material provided by the invention has good fluidity, is easy to seal the carbon fiber pipe orifice, has good shape adaptability to a heating pipe, and is a heat-conducting packaging material with excellent comprehensive performance.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The inorganic heat-conducting packaging material is characterized by being prepared from the following components in parts by mass:
630-670 parts of magnesium oxide, 120-180 parts of magnesium sulfate, 60-95 parts of a network forming agent, 5-25 parts of a crystallization auxiliary agent, 3-20 parts of a beta-sodium naphthalenesulfonate formaldehyde condensate, 0-15 parts of latex powder and 300-350 parts of water.
2. The packaging material of claim 1, wherein the network forming agent comprises mica powder and a binder, and the mass ratio of the mica powder to the binder is 1.5-3: 4 to 7.
3. The packaging material of claim 2, wherein the particle size of the mica powder is 1250 mesh or less; the specific surface area of the base material is more than or equal to 10m 2 /g；
The base material is silicon carbide or graphite.
4. The encapsulating material according to any one of claims 1 to 3, wherein the crystallization aid comprises one or more of citric acid, calcium silicate, silica and calcium aluminate;
the specific surface area of the crystallization aid is more than or equal to 10m 2 And the particle size of the latex powder is less than or equal to 500 mu m.
5. The method for preparing the encapsulating material according to any one of claims 1 to 4, comprising the steps of:
(1) mixing magnesium sulfate and first part of water to obtain magnesium sulfate solution;
(2) mixing a network forming agent, latex powder, a first part of magnesium oxide, a beta-sodium naphthalene sulfonate formaldehyde condensate and the rest of water to obtain a suspension dispersion liquid;
(3) and mixing the magnesium sulfate solution, the suspension dispersion liquid, the residual magnesium oxide and the crystallization auxiliary agent to obtain the inorganic heat-conducting packaging material.
6. The method according to claim 5, wherein the mass of the first portion of water in the step (1) is 75 to 80% of the mass of water.
7. The method according to claim 5 or 6, wherein the first portion of magnesium oxide in step (2) has a mass of 0.149 to 0.159% of the mass of magnesium oxide.
8. The preparation method according to claim 7, wherein the mixing in the step (2) is ultrasonic, the temperature of the ultrasonic is 18-30 ℃, the time of the ultrasonic is 30-50 min, and the frequency of the ultrasonic is greater than or equal to 25 KHz.
9. The production method according to claim 6 or 8, wherein the mixing in the step (3) is carried out by slow stirring and fast stirring sequentially;
the speed of the slow stirring is 120-150 rpm, and the time of the slow stirring is 120-150 s;
the speed of the rapid stirring is 260-300 rpm, and the time of the rapid stirring is 120-150 s;
the interval time between the slow stirring and the fast stirring is 30-40 s.
10. Use of the packaging material of any one of claims 1 to 4 in the packaging of an electric heating system.
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