CN112266215A - Heat insulation material composition, heat insulation ring, preparation method of heat insulation ring and cooking appliance - Google Patents
Heat insulation material composition, heat insulation ring, preparation method of heat insulation ring and cooking appliance Download PDFInfo
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- CN112266215A CN112266215A CN202011200056.3A CN202011200056A CN112266215A CN 112266215 A CN112266215 A CN 112266215A CN 202011200056 A CN202011200056 A CN 202011200056A CN 112266215 A CN112266215 A CN 112266215A
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- heat insulation
- material composition
- vermiculite
- heat
- insulation ring
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Classifications
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- 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
- C04B28/02—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 hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J45/00—Devices for fastening or gripping kitchen utensils or crockery
- A47J45/10—Devices for gripping or lifting hot cooking utensils, e.g. pincers, separate pot handles, fabric or like pads
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J47/00—Kitchen containers, stands or the like, not provided for in other groups of this subclass; Cutting-boards, e.g. for bread
- A47J47/16—Stands, or holders for kitchen articles
-
- 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
Abstract
The invention discloses a heat insulation material composition, a heat insulation ring, a preparation method of the heat insulation ring and a cooking appliance. Wherein the heat insulating material composition comprises, in weight percent: 10% -70% of fumed silica; 5% -30% of polycrystalline alumina fiber; 5% -40% of vermiculite; and 5% -30% of cement. The technical scheme of the invention can improve the heat insulation effect and reduce the heat storage coefficient, thereby improving the energy efficiency.
Description
Technical Field
The invention relates to the technical field of heat insulation materials, in particular to a heat insulation material composition, a preparation method of a heat insulation ring, the heat insulation ring prepared by the preparation method of the heat insulation ring, and a cooking appliance applying the heat insulation ring.
Background
In order to reduce the influence of a high-temperature heating disc in an electric ceramic furnace on a bottom case, a heat insulation ring is generally arranged in the bottom case, namely, the peripheral edge of the heating disc, wherein the heat insulation ring is usually formed by stirring, mixing, pressing, baking and other methods of various refractory materials.
Disclosure of Invention
The invention mainly aims to provide a heat insulation material composition, a heat insulation ring, a preparation method of the heat insulation ring and a cooking appliance, aiming at improving the heat insulation effect and reducing the heat storage coefficient so as to improve the energy efficiency of the cooking appliance.
In order to achieve the above purpose, the heat insulation material composition provided by the invention comprises the following components in percentage by weight: 10% -70% of fumed silica; 5% -30% of polycrystalline alumina fiber; 5% -40% of vermiculite; and 5% -30% of cement.
Optionally, the polycrystalline alumina fibers have a diameter in the range of 3 μm to 7 μm and a length in the range of 10mm to 150 mm.
Optionally, the vermiculite has a mesh size in the range of 20 mesh to 60 mesh; and/or the fumed silica has a specific surface area in the range of 150m2/g-200m2/g。
Optionally, the heat-insulating material composition further comprises 10-40% by weight of silicon carbide; and/or, the heat-insulating material composition further comprises 5-40% of auxiliary water in percentage by weight.
Optionally, the thermal insulation material composition further comprises 1-15% by weight of glass fibers.
Optionally, the glass fibers have a diameter in the range of 10 μm to 13 μm and a length in the range of 6mm to 12 mm.
The invention also provides a preparation method of the heat insulation ring, which comprises the following steps:
providing a thermal insulation material composition comprising, in weight percent: 10% -70% of fumed silica; 5% -30% of polycrystalline alumina fiber; 5% -40% of vermiculite; and 5% -30% of cement;
mixing the fumed silica, the polycrystalline alumina fibers, the vermiculite and the cement to obtain a mixed powder material;
and carrying out die-casting treatment on the mixed powder to obtain the heat insulation ring.
Optionally, the step of mixing the fumed silica, the polycrystalline alumina fibers, the vermiculite, and the cement to obtain a mixed powder material includes:
adding an auxiliary agent into the fumed silica, the polycrystalline alumina fibers, the vermiculite and the cement, and mixing to obtain the mixed material, wherein the auxiliary agent is at least one of silicon carbide and glass fibers.
The invention also provides a heat insulation ring, which is obtained by the preparation method of the heat insulation ring.
The invention also provides a cooking appliance which comprises the heating plate and the heat insulation ring, wherein the heat insulation ring is arranged on the peripheral edge of the heating plate in a surrounding manner.
According to the technical scheme, the heat insulation ring is prepared according to a certain proportion by adopting the heat insulation material composition of the fumed silica, the polycrystalline alumina fiber, the vermiculite and the cement, and the heat insulation ring prepared from the heat insulation material composition has a good heat insulation effect and high heat energy utilization efficiency due to the fact that the fumed silica, the polycrystalline alumina fiber and the vermiculite are low in heat conductivity and small in heat storage coefficient. And moreover, the cement has better strength, so that the prepared heat insulation ring has better strength.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. 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.
In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The invention provides a heat insulation material composition which is applied to a heat insulation ring.
The heat insulating material composition comprises the following components in percentage by weight: 10% -70% of fumed silica; 5% -30% of polycrystalline alumina fiber; 5% -40% of vermiculite; and 5% -30% of cement.
The gas phase method silicon dioxide is a nano porous transparent heat insulation material, and has high porosity, small average pore diameter, large specific surface area, low density and lower heat conductivity, namely, the heat insulation effect is better. The polycrystalline alumina fiber is one of crystalline ceramic fibers, the alumina content in the fiber is 72-99%, the fiber is a product with coexisting polycrystalline phases, and the maximum use temperature can reach 1600 ℃. As can be understood, the polycrystalline alumina fiber is used as a high-temperature-resistant inorganic fiber, has good chemical stability, high service temperature, good heat insulation and small heat storage coefficient, can improve the heat insulation effect after being added, and simultaneously reduces the heat storage coefficient, thereby effectively improving the utilization efficiency of heat energy and realizing the energy-saving effect. The vermiculite is a natural, inorganic and nontoxic silicate mineral substance, has low thermal conductivity and strong heat preservation and insulation performance; the vermiculite is generally of a layered structure and can be used as a framework, and the strength is good, so that the prepared heat insulation ring has good structural strength after the vermiculite is added. The cement has better strength, and the prepared heat insulation ring has better strength after being added.
When the heat insulation material composition for preparing the heat insulation ring is prepared, the proportion of each component is reasonably controlled to ensure that each component fully exerts the function thereof, so that the finally prepared heat insulation ring has better performance. The vermiculite has better expansibility, and if the vermiculite is added in an excessive amount, the vermiculite can expand excessively, so that the strength of the heat insulation ring is influenced. Typically, the fumed silica is present in an amount of 10%, 20%, 30%, 40%, 50%, 60%, or 70% by weight; the content of the polycrystalline alumina fiber is 5%, 15%, 25% or 30%; the content of vermiculite is 5%, 15%, 25%, 35% or 40%; and the cement content is 5%, 15%, 25% or 30%.
According to the technical scheme, the heat insulation ring is prepared according to a certain proportion by adopting the heat insulation material composition of the fumed silica, the polycrystalline alumina fiber, the vermiculite and the cement, and the heat insulation ring prepared from the heat insulation material composition has a good heat insulation effect and high heat energy utilization efficiency due to the fact that the fumed silica, the polycrystalline alumina fiber and the vermiculite are low in heat conductivity and small in heat storage coefficient. And moreover, the cement has better strength, so that the prepared heat insulation ring has better strength.
Optionally, the polycrystalline alumina fiber is polycrystalline mullite fiber, the polycrystalline mullite fiber is used as one of the polycrystalline alumina fibers, the alumina content in the fiber is 72-75%, and the fiber has good high-temperature resistance, low thermal conductivity, low heat storage coefficient and other properties.
Alternatively, the diameter of the polycrystalline alumina fibers is in the range of 3 μm to 7 μm and the length of the polycrystalline alumina fibers is in the range of 10mm to 150 mm. The polycrystalline alumina fiber with the diameter range and the length range not only can show better heat insulation effect, but also has better operability when the heat insulation ring is prepared.
When vermiculite is selected, the specification of the vermiculite is properly selected, and if the vermiculite is too thin, the prepared heat insulation ring has insufficient strength and is easy to crack. Optionally, the vermiculite has a mesh size in the range of 20 mesh to 60 mesh.
Alternatively, the fumed silica has a specific surface area in the range of from 150m2/g to 200m 2/g.
Optionally, portland cement is selected as the cement, and the portland cement not only has good strength, but also has better high temperature resistance, and can further improve the temperature resistance of the heat insulation ring.
Further, the heat-insulating material composition also comprises 10-40% of silicon carbide according to weight percentage.
The silicon carbide is an infrared opacifier, has good heat insulation performance, and simultaneously, the heat insulation ring prepared by adding the silicon carbide also has good appearance. It should be noted that the addition amount of silicon carbide should be reasonably controlled so that the silicon carbide can fully exert its performance and will not cause resource waste. Typically, the silicon carbide is added in a weight percentage of 10%, 20%, 30% or 40%.
Further, the heat-insulating material composition also comprises 5-40% of auxiliary water in percentage by weight.
In the process of preparing the heat insulation ring, a certain amount of auxiliary water is added. The pressure maintaining time of the heat insulation ring in the pressing forming process can be shortened by adding a certain amount of water, the production efficiency is improved, and the dust emission problem in the production process is improved. However, if the proportion of the added water is too high, the performance such as the heat insulating effect of the heat insulating ring is affected, so that the amount of the auxiliary water to be added needs to be controlled appropriately, and the auxiliary water is generally added in an amount of 5%, 10%, 20%, 30% or 40% by weight.
Further, the heat insulating material composition also comprises 1-15% of glass fiber by weight percentage.
The glass fiber has strong heat resistance and high mechanical strength, and the heat insulation effect and the mechanical strength of the prepared heat insulation ring can be further improved after the glass fiber is added. It should be noted that the addition amount of the glass fiber should be reasonably controlled so as to fully exert the performance thereof and not cause resource waste. Typically, the glass fibers are added at 1%, 5%, 10% or 15% by weight.
Alternatively, the glass fibers have a diameter in the range of 10 μm to 13 μm and a length in the range of 6mm to 12 mm. The glass fiber with the diameter range and the length range is selected, so that the heat insulation effect and the mechanical strength of the prepared heat insulation ring can be improved, and the better operability of the heat insulation ring can be ensured.
The invention also provides a preparation method of the heat insulation ring, which comprises the following steps:
providing a thermal insulation material composition comprising, in weight percent: 10% -70% of fumed silica; 5% -30% of polycrystalline alumina fiber; 5% -40% of vermiculite; and 5% -30% of cement;
mixing the fumed silica, the polycrystalline alumina fibers, the vermiculite and the cement to obtain a mixed powder material;
and carrying out die-casting treatment on the mixed powder to obtain the heat insulation ring.
Specifically, firstly, weighing corresponding fumed silica, polycrystalline alumina fiber, vermiculite and cement according to a certain weight percentage; then sequentially adding the powder into a stirring tank, and stirring for 10-25min at normal temperature to fully mix the powder to obtain mixed powder; and finally, putting the mixed powder into a specific die of the heat insulation ring, and die-casting the mixed powder into the heat insulation ring by using a hydraulic machine within the range of 60T-100T under the pressure within the range of 25MPa-50MPa and the time within the range of 1s-5 s. Because the heat insulation material composition has a good heat insulation effect and high strength, the prepared heat insulation ring also has a good heat insulation effect and high strength.
In an embodiment of the present invention, the step of mixing the fumed silica, the polycrystalline alumina fibers, the vermiculite, and the cement to obtain a mixed powder material includes:
adding an auxiliary agent into the fumed silica, the polycrystalline alumina fibers, the vermiculite and the cement, and mixing to obtain the mixed material, wherein the auxiliary agent is at least one of silicon carbide and glass fibers.
Specifically, the auxiliary agents with corresponding amounts are weighed according to certain weight percentages respectively, are sequentially added into a stirring tank containing fumed silica, polycrystalline alumina fiber, vermiculite and cement, are uniformly stirred and mixed to obtain mixed powder, and the subsequent steps are repeated to prepare the heat insulation ring. The addition of the auxiliary agent can further improve the heat insulation effect and the strength of the heat insulation ring. According to the weight percentage, the dosage of the silicon carbide in the auxiliary agent is 10-30 percent, and the dosage of the glass fiber is 1-15 percent.
The invention also provides a heat insulation ring, which is obtained by the preparation method of the heat insulation ring.
The invention also provides a cooking appliance which comprises the heating plate and the heat insulation ring, wherein the heat insulation ring is arranged on the peripheral edge of the heating plate in a surrounding manner. The cooking electric appliance can be an electric ceramic oven, a health preserving pot, an induction cooker and the like.
The heat insulating ring and the method for manufacturing the same according to the present invention will be described in detail with reference to the following embodiments.
Example 1
The raw materials are prepared according to the weight percentage as follows:
60% of gas phase method silicon dioxide;
5% of polycrystalline alumina fiber;
25% of vermiculite;
10% of cement.
In this example, the fumed silica had a specific surface area of 200m2(ii)/g; the diameter of the polycrystalline alumina fiber is between 3 and 7 mu m; the mesh number of the vermiculite is 20-60 meshes; the cement is portland cement.
And sequentially adding the raw materials into a stirring tank, and stirring for 20 minutes at normal temperature to fully mix the raw materials to obtain mixed powder. In the course of stirring, 30% of adjuvant water was added. Then, the mixed powder is put into a specific die of the heat insulation ring, and the mixed powder is die-cast by using a 60T hydraulic press at the pressure of 25MPa for 5s, so that the heat insulation ring can be obtained.
Example 2
The raw materials are prepared according to the weight percentage as follows:
fumed silica, 25%;
polycrystalline alumina fiber, 16%;
25% of vermiculite;
16% of Portland cement;
16% of silicon carbide;
2% of glass fiber.
In this example, the fumed silica had a specific surface area of 200m2(ii)/g; the diameter of the polycrystalline alumina fiber is between 3 and 7 mu m; the mesh number of the vermiculite is 20-60 meshes; the cement is portland cement.
And sequentially adding the raw materials into a stirring tank, and stirring for 20 minutes at normal temperature to fully mix the raw materials to obtain mixed powder. During the stirring, auxiliary water was added in an amount of 15%. Then, the mixed powder is put into a specific die of the heat insulation ring, and the mixed powder is die-cast by using a 60T hydraulic press at the pressure of 25MPa for 3s, so that the heat insulation ring can be obtained.
Example 3
The raw materials are prepared according to the weight percentage as follows:
fumed silica, 30%;
polycrystalline alumina fiber, 15%;
25% of vermiculite;
portland cement, 14%;
silicon carbide, 14%;
2% of glass fiber.
In this example, the fumed silica had a specific surface area of 200m2(ii)/g; the diameter of the polycrystalline alumina fiber is between 3 and 7 mu m; the mesh number of the vermiculite is 20-60 meshes; the cement is portland cement.
And sequentially adding the raw materials into a stirring tank, and stirring for 20 minutes at normal temperature to fully mix the raw materials to obtain mixed powder. In the course of stirring, 20% of adjuvant water was added. Then, the mixed powder is put into a specific die of the heat insulation ring, and the mixed powder is die-cast by using a 60T hydraulic press at the pressure of 25MPa for 3s, so that the heat insulation ring can be obtained.
Example 4
The raw materials are prepared according to the weight percentage as follows:
fumed silica, 35%;
polycrystalline alumina fiber, 10%;
25% of vermiculite;
20% of Portland cement;
8% of silicon carbide;
2% of glass fiber.
In this example, the fumed silica had a specific surface area of 200m2(ii)/g; the diameter of the polycrystalline alumina fiber is between 3 and 7 mu m; the mesh number of the vermiculite is 20-60 meshes; the cement is portland cement.
And sequentially adding the raw materials into a stirring tank, and stirring for 20 minutes at normal temperature to fully mix the raw materials to obtain mixed powder. In the course of stirring, 20% of adjuvant water was added. Then, the mixed powder is put into a specific die of the heat insulation ring, and the mixed powder is die-cast by using a 60T hydraulic press at the pressure of 25MPa for 3s, so that the heat insulation ring can be obtained.
Example 5
The raw materials are prepared according to the weight percentage as follows:
fumed silica, 40%;
polycrystalline alumina fiber, 10%;
19% of vermiculite;
portland cement, 14%;
15% of silicon carbide;
2% of glass fiber.
In this example, the fumed silica had a specific surface area of 200m2(ii)/g; the diameter of the polycrystalline alumina fiber is between 3 and 7 mu m; the mesh number of the vermiculite is 20-60 meshes; the cement is portland cement.
And sequentially adding the raw materials into a stirring tank, and stirring for 20 minutes at normal temperature to fully mix the raw materials to obtain mixed powder. During the stirring, 25% of adjuvant water was added. Then, the mixed powder is put into a specific die of the heat insulation ring, and the mixed powder is die-cast by using a 60T hydraulic press under the pressure of 25MPa for 2s, so that the heat insulation ring can be obtained.
The heat insulating rings prepared in examples 1 to 5 were mounted in the bottom case (the peripheral edge of the heating plate) of an electric ceramic oven to assemble the electric ceramic oven, and the electric ceramic oven was subjected to a performance test according to EN60350-2 energy efficiency standard of household electric range ovens. The specific test method comprises the steps of using the same electric ceramic furnace heating disc finished product assembled by the energy efficiency heat insulation pads, sequentially replacing different heat insulation rings for testing, and recording final data in a table 1.
TABLE 1 table of results of performance tests for various examples
As can be seen from table 1, in the five examples, the energy efficiency test result value is better than that of the heat insulation ring produced by the conventional formula. Also, the heat insulating rings prepared in examples 1 to 5 were all good in appearance after the test.
It can be understood from examples 1 to 5 that the thermal insulation ring prepared by adjusting the proportion and the amount of each component in the thermal insulation material composition, that is, the thermal insulation ring prepared by the present invention has better thermal insulation effect than the conventional thermal insulation ring, and therefore, the energy efficiency of the thermal insulation ring of the present invention is significantly improved.
In addition, the composition of the thermal insulation material composition of the present invention meets the ROHS certification requirements. The heat insulation ring also has higher strength, and the service life of the heat insulation ring is longer than that of the traditional heat insulation ring; meanwhile, the preparation cost of the heat insulation ring is lower.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the present specification and directly/indirectly applied to other related technical fields within the spirit of the present invention are included in the scope of the present invention.
Claims (10)
1. The heat insulation material composition is applied to a heat insulation ring, and is characterized by comprising the following components in percentage by weight:
10% -70% of fumed silica;
5% -30% of polycrystalline alumina fiber;
5% -40% of vermiculite; and
5 to 30 percent of cement.
2. The thermal insulation material composition of claim 1, wherein the polycrystalline alumina fibers have a diameter in the range of 3 μ ι η to 7 μ ι η and a length in the range of 10mm to 150 mm.
3. The thermal insulation material composition of claim 1, wherein the vermiculite has a mesh size in the range of 20 mesh to 60 mesh;
and/or the fumed silica has a specific surface area in the range of 150m2/g-200m2/g。
4. The thermal insulation material composition according to any one of claims 1 to 3, further comprising 10% to 40% by weight of silicon carbide;
and/or, the heat-insulating material composition further comprises 5-40% of auxiliary water in percentage by weight.
5. The insulation material composition according to any one of claims 1 to 3, wherein said insulation material composition further comprises glass fibers in a range of 1% to 15% by weight.
6. The insulation composition of claim 5, wherein said glass fibers have a diameter in the range of 10 μm to 13 μm and a length in the range of 6mm to 12 mm.
7. The preparation method of the heat insulation ring is characterized by comprising the following steps:
providing a thermal insulation material composition comprising, in weight percent: 10% -70% of fumed silica; 5% -30% of polycrystalline alumina fiber; 5% -40% of vermiculite; and 5% -30% of cement;
mixing the fumed silica, the polycrystalline alumina fibers, the vermiculite and the cement to obtain a mixed powder material;
and carrying out die-casting treatment on the mixed powder to obtain the heat insulation ring.
8. The method for manufacturing a heat insulating ring according to claim 7, wherein the step of mixing the fumed silica, the polycrystalline alumina fibers, the vermiculite, and the cement to obtain a mixed powder comprises:
adding an auxiliary agent into the fumed silica, the polycrystalline alumina fibers, the vermiculite and the cement, and mixing to obtain the mixed material, wherein the auxiliary agent is at least one of silicon carbide and glass fibers.
9. An insulating collar obtained by the method for manufacturing an insulating collar according to any one of claims 7 to 8.
10. An electric cooking appliance comprising a heat generating plate and the heat insulating ring of claim 9, wherein the heat insulating ring is provided around the outer peripheral edge of the heat generating plate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011200056.3A CN112266215A (en) | 2020-10-30 | 2020-10-30 | Heat insulation material composition, heat insulation ring, preparation method of heat insulation ring and cooking appliance |
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| CN202011200056.3A CN112266215A (en) | 2020-10-30 | 2020-10-30 | Heat insulation material composition, heat insulation ring, preparation method of heat insulation ring and cooking appliance |
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| CN116553921A (en) * | 2023-02-27 | 2023-08-08 | 河南三元光电科技有限公司 | High-temperature-resistant heat-insulating composite material and preparation method thereof |
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Application publication date: 20210126 |