Preparation Method of Thermal Conductive Ceramic Hand Mold

Abstract

The present invention belongs to the technical field of the preparation of ceramic hand molds, and particularly relates to a preparation method of a heat-conducting ceramic hand mold. The preparation method comprises the following steps: (1) preparation of a green body slurry; (2) preparation of a semi-finished green body; (3) preparation of a glaze layer slurry; (4) preparation of a semi-finished ceramic hand mold; (5) preparation of a heat-conducting ceramic hand mold. The heat-conducting ceramic hand mold prepared by the preparation method of the present invention has excellent thermal conductivity, can rapidly heat up, thereby shortening the drying time of gloves in the production process and improving the production efficiency of gloves. In addition, the prepared heat-conducting ceramic hand mold also has excellent acid and alkali corrosion resistance and thermal shock stability.

Description

Technical Field

[0001] The present invention belongs to the technical field of ceramic hand mold preparation, and specifically relates to a preparation method of a heat-conducting ceramic hand mold. Background Art

[0002] Nitrile gloves are processed from synthetic latex. Compared with natural latex gloves, they do not contain proteins and are not easily allergic. At the same time, they have good softness, tensile strength, elongation at break, oil resistance and wearing comfort. They can be used to make disposable thin nitrile gloves, labor protection gloves with liners and thick nitrile gloves, and have been widely used in medical, industrial and household fields.

[0003] Nitrile gloves are made through processes such as dipping nitrile latex, forming, vulcanizing, surface treatment, and dust-free cleaning. During the preparation process, first, the hand mold used needs to be pickled with acid, washed with alkali, rinsed, and dried. Then, the hand mold is dipped in a coagulant solution and latex raw materials, and after vulcanization, it is demolded to prepare nitrile gloves. Among them, nitric acid and other acidic solutions are used for pickling, sodium hydroxide and other alkaline solutions are used for alkali washing, chlorine water is used for rinsing, the rinsing time is about 20 - 30 min, the temperature of dipping the coagulant solution is 60 - 70 °C, the temperature of dipping the latex raw materials is 20 - 30 °C, the vulcanization temperature is 120 - 130 °C, the vulcanization time is 10 - 30 min, and rapid heating is required during vulcanization.

[0004] In summary, the hand mold used for preparing nitrile gloves is required to have high heat conduction efficiency, be able to heat up quickly, be resistant to acid and alkali corrosion, and have high thermal shock stability. However, the currently used metal hand mold has defects such as being prone to overcooking or undercooking during processes such as glove vulcanization due to too fast cooling. Therefore, it is necessary to explore a new type of heat-conducting ceramic hand mold. Summary of the Invention

[0005] The purpose of the present invention is to provide a preparation method of a heat-conducting ceramic hand mold. The ceramic hand mold prepared by this method has excellent thermal conductivity and acid and alkali corrosion resistance.

[0006] The preparation method of the heat-conducting ceramic hand mold described in the present invention is composed of the following steps:

[0007] (1) Weigh the blank raw materials according to the weight ratio, then load them into a ball mill, add water and wet ball mill to make blank slurry. Finally, filter the blank slurry through a 325-mesh vibrating screen and let it stand for aging. Among them, the blank, by weight, is composed of the following raw materials: 45 - 47 parts of calcined kaolin, 24 - 26 parts of alumina, 16 - 18 parts of quartz sand, 11 - 13 parts of brown fused alumina, 6 - 8 parts of magnesite, 5 - 7 parts of diopside, 7 - 8 parts of chromium(III) oxide, 5 - 6 parts of titanium silicide, 1.2 - 1.4 parts of niobium pentoxide;

[0008] (2) Adjustment steps (1) The specific gravity of the green body slurry after standing and aging is 1.65g / cm 3 -1.67g / cm 3 , then vacuum for 2-3 hours, and finally perform grouting molding to prepare a green semi-finished product, and dry the green semi-finished product;

[0009] (3) mixing the glaze raw materials according to a weight ratio, and then loading them into a ball mill, adding water, and wet-milling them to prepare a glaze slurry. Finally, filtering the glaze slurry through a 350-mesh vibrating sieve, and then standing to age, wherein the glaze layer is composed of the following raw materials in parts by weight: 33-35 parts of quartz sand, 12-13 parts of calcined kaolin, 14-15 parts of sillimanite, 13-14 parts of borax, 8-10 parts of spodumene, 3-5 parts of lanthanum phosphate, 8-10 parts of zinc aluminate, 5-7 parts of aluminum borate, and 13-15 parts of calcium zirconate;

[0010] (4) Adjustment step (3) The specific gravity of the glaze layer slurry after standing and aging is 1.61g / cm 3 -1.63g / cm 3 , then evacuate for 2-3 hours, immerse the semi-finished green body dried in step (2) in glaze slurry for a period of time, then take it out, and prepare a ceramic hand mold semi-finished product by drying;

[0011] (5) Soak the semi-finished ceramic hand mold obtained in step (4) in water for 2-3 seconds, then use a sandblasting gun to evenly spray ceramic microspheres onto the pockmarks, and finally sinter to obtain a thermally conductive ceramic hand mold.

[0012] in:

[0013] In step (1), the mass ratio of water added during wet ball milling to the mass ratio of the green body raw material is 0.6-0.8:1, and the wet ball milling time is 26-28h.

[0014] The standing aging time in step (1) is 24 hours.

[0015] In step (2), the pressure of the grouting molding is 0.8-0.85 MPa, the drying temperature is 55-60° C., and the drying time is 42 h.

[0016] In step (3), the mass ratio of water added during wet ball milling to the mass ratio of the green body raw material is 1.0-1.2:1, and the wet ball milling time is 20-22h.

[0017] The standing aging time in step (3) is 26 hours.

[0018] In step (4), the glaze dipping times are 2 times, each glaze dipping time is 5 seconds, the drying temperature is 83-85°C, and the drying time is 6 hours.

[0019] In step (5), the particle size of the ceramic microspheres is 0.5 mm, and the sandblasting pressure is 0.4 MPa.

[0020] The firing in step (5) is carried out by heating at a heating rate of 3.5 °C / min to 640 - 650 °C and holding for 50 min, then heating at a heating rate of 2.5 °C / min to 1270 - 1280 °C and holding for 2 h, and finally cooling at a cooling rate of 2.5 °C / min to 800 - 810 °C, followed by furnace cooling to room temperature.

[0021] In the preparation method of the heat-conducting ceramic hand mold of the present invention, the green body uses calcined kaolin, alumina, quartz sand, and brown fused alumina as the main raw materials. The calcined kaolin sinters to form mullite phase at high temperature, ensuring the mechanical strength and thermal stability of the ceramic hand mold green body. Alumina and quartz sand interact to form a silicate network, promoting the densification of the ceramic hand mold green body while enhancing the wear resistance of the ceramic hand mold green body. Adding a small amount of brown fused alumina improves the impact resistance and erosion resistance of the ceramic hand mold green body. Diopside and magnesite are used as sintering aids to reduce the sintering temperature, improve the thermal shock resistance and alkali resistance. Among them, magnesite can also interact with silica to generate forsterite, adjusting the thermal expansion matching performance of the ceramic hand mold green body. Chromium trioxide, titanium silicide, and niobium pentoxide are used as additives to improve the densification, acid and alkali corrosion resistance, thermal shock stability, and thermal conductivity of the green body. The chromium trioxide has good high-temperature stability and oxidation resistance. Chromium trioxide and alumina can form a continuous solid solution during high-temperature sintering, thereby improving the density of the ceramic hand mold green body. Titanium silicide can be used as a reinforcing phase to improve the wear resistance of the ceramic hand mold green body. Through pinning the grain boundaries and the crack deflection mechanism, the flexural strength of the ceramic hand mold green body is improved. Most importantly, its addition greatly improves the thermal conductivity of the ceramic hand mold, promotes uniform heat distribution, reduces thermal stress, improves the acid resistance of the ceramic hand mold, and improves the high-temperature load-bearing capacity of the ceramic hand mold by inhibiting grain boundary slip. To enhance the alkali and strong acid resistance of the prepared ceramic hand mold, niobium pentoxide is additionally added. Niobium pentoxide can form a low-melting-point liquid phase with alumina or silica, which can fill the grain boundary pores, reduce the sintering temperature while promoting the densification of the ceramic hand mold green body. Its addition can also inhibit abnormal grain growth, thus forming a uniform fine-grained structure.

[0022] The preparation method of the heat-conducting ceramic hand mold described in the present invention uses quartz sand, calcined kaolin, sillimanite, and spodumene as the main raw materials in the glaze layer. Among them, quartz sand provides the framework structure of the glaze layer. Calcined kaolin can form mullite phase after sintering to enhance the structural stability of the glaze layer of the ceramic hand mold and improve the rheology of the glaze. Sillimanite and spodumene cooperate with each other to reduce the thermal stress between the glaze layer and the green body, improve the adaptability of the green body and glaze, and thermal shock stability. Borax is used as a flux to reduce the sintering temperature of the glaze while increasing the densification degree of the glaze layer. Lanthanum phosphate, zinc aluminate, aluminum borate, and calcium zirconate are used as additives. The addition of lanthanum phosphate can inhibit the precipitation of the glass phase in the glaze layer and at the same time ensure that the glaze layer has excellent corrosion resistance. Zinc aluminate, aluminum borate, and calcium zirconate cooperate with each other to ensure that the glaze layer has excellent thermal conductivity. In addition, the addition of zinc aluminate can improve the hardness of the glaze layer and the corrosion resistance of the glaze layer in a strong acid environment. Aluminum borate can form a B-Al-O network at high temperature to improve the densification of the glaze layer, while the addition of calcium zirconate can improve the alkali corrosion resistance of the glaze layer. Therefore, the lanthanum phosphate, zinc aluminate, aluminum borate, and calcium zirconate act synergistically to further ensure that the glaze layer has excellent corrosion resistance and thermal conductivity.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] (1) In the preparation method of the heat-conducting ceramic hand mold described in the present invention, the hand mold green body and the glaze layer cooperate with each other. Chromium trioxide, titanium silicide, and niobium pentoxide are used as additives in the hand mold green body to ensure the densification of the ceramic hand mold green body and improve the thermal conductivity of the ceramic hand mold green body. Lanthanum phosphate, zinc aluminate, aluminum borate, and calcium zirconate are used as additives in the glaze layer to ensure the thermal conductivity and corrosion resistance of the glaze layer. Thus, the green body and the glaze layer interact with each other to prepare a heat-conducting ceramic hand mold with excellent performance.

[0025] (2) The heat-conducting ceramic hand mold prepared by using the preparation method described in the present invention has excellent thermal conductivity and can quickly heat up, thereby shortening the drying time of the gloves during the production process and improving the production efficiency of the gloves. In addition, the prepared heat-conducting ceramic hand mold also has excellent acid and alkali corrosion resistance and thermal shock stability. Specific Embodiments

[0026] The present invention will be further described below in conjunction with embodiments.

[0027] Example 1

[0028] The preparation method of the heat-conducting ceramic hand mold described in Example 1 of the present invention consists of the following steps:

[0029] (1) The green body raw materials are mixed according to the weight ratio, and then loaded into a ball mill, water is added, and wet ball milling is performed to prepare a green body slurry. Finally, the green body slurry is filtered through a 325-mesh vibrating screen and then allowed to stand for aging, wherein the green body is composed of the following raw materials in parts by weight: 46 parts of calcined kaolin, 25 parts of aluminum oxide, 17 parts of quartz sand, 12 parts of brown corundum, 7 parts of magnesite, 6 parts of diopside, 7.5 parts of chromium trioxide, 5.5 parts of titanium silicide, and 1.3 parts of niobium pentoxide;

[0030] (2) Adjustment steps (1) The specific gravity of the green body slurry after standing and aging is 1.66g / cm 3 , then vacuum for 2.5 hours, and finally perform slip casting to prepare a green semi-finished product, and dry the green semi-finished product;

[0031] (3) mixing the glaze raw materials according to the weight ratio, and then loading them into a ball mill, adding water and wet-milling them to prepare a glaze slurry. Finally, filtering the glaze slurry through a 350-mesh vibrating sieve and letting it stand for aging, wherein the glaze layer is composed of the following raw materials in parts by weight: 34 parts of quartz sand, 12.5 parts of calcined kaolin, 14.5 parts of sillimanite, 13.5 parts of borax, 9 parts of spodumene, 4 parts of lanthanum phosphate, 9 parts of zinc aluminate, 6 parts of aluminum borate, and 14 parts of calcium zirconate;

[0032] (4) Adjustment step (3) The specific gravity of the glaze layer slurry after standing and aging is 1.62g / cm 3 , then evacuate for 2.5 hours, immerse the semi-finished green body dried in step (2) in glaze slurry for a period of time, then take it out, and dry it to obtain a semi-finished ceramic hand mold;

[0033] (5) Soak the semi-finished ceramic hand mold obtained in step (4) in water for 2 seconds, then use a sandblasting gun to evenly spray ceramic microspheres onto the pockmarks, and finally sinter to obtain a thermally conductive ceramic hand mold.

[0034] in:

[0035] In step (1), the mass ratio of water added during wet ball milling to the mass ratio of the green body raw material is 0.7:1, and the wet ball milling time is 27 hours.

[0036] The standing aging time in step (1) is 24 hours.

[0037] In step (2), the pressure of the grouting molding is 0.83 MPa, the drying temperature is 57° C., and the drying time is 42 h.

[0038] In step (3), the mass ratio of water added during wet ball milling to the mass ratio of the green body raw material is 1.1:1, and the wet ball milling time is 21 hours.

[0039] The standing aging time in step (3) is 26 hours.

[0040] In step (4), the number of glaze dipping times is 2 times, the glaze dipping time for each time is 5 s, the drying temperature is 84 °C, and the drying time is 6 h.

[0041] In step (5), the particle size of the ceramic microspheres is 0.5 mm, and the sandblasting pressure is 0.4 MPa.

[0042] In step (5), the firing is carried out by heating at a heating rate of 3.5 °C / min to 645 °C and holding for 50 min, then heating at a heating rate of 2.5 °C / min to 1275 °C and holding for 2 h, and finally cooling at a cooling rate of 2.5 °C / min to 805 °C, and then cooling in the furnace to room temperature.

[0043] Example 2

[0044] The preparation method of the heat-conducting ceramic hand mold described in this Example 2 comprises the following steps:

[0045] (1) Weigh the body raw materials according to the weight ratio, then load them into a ball mill, add water and wet ball mill to make a body slurry, and finally filter the body slurry through a 325-mesh vibrating screen and let it stand for aging. The body, by weight, is composed of the following raw materials: 45 parts of calcined kaolin, 26 parts of alumina, 16 parts of quartz sand, 13 parts of brown fused alumina, 8 parts of magnesite, 5 parts of diopside, 8 parts of chromium sesquioxide, 5 parts of titanium silicide, and 1.4 parts of niobium pentoxide;

[0046] (2) Adjust the specific gravity of the body slurry after standing for aging in step (1) to 1.67 g / cm 3 , then evacuate for 3 h, and finally carry out slip casting to prepare a semi-finished body, and perform drying treatment on the semi-finished body.

[0047] (3) Weigh the glaze raw materials according to the weight ratio, then load them into a ball mill, add water and wet ball mill to make a glaze slurry, and finally filter the glaze slurry through a 350-mesh vibrating screen and let it stand for aging. The glaze, by weight, is composed of the following raw materials: 35 parts of quartz sand, 13 parts of calcined kaolin, 14 parts of sillimanite, 13 parts of borax, 10 parts of spodumene, 3 parts of lanthanum phosphate, 10 parts of zinc aluminate, 7 parts of aluminum borate, and 13 parts of calcium zirconate;

[0048] (4) Adjust the specific gravity of the glaze slurry after standing for aging in step (3) to 1.63 g / cm 3 , then evacuate for 3 h, immerse the semi-finished body of the body obtained by drying treatment in step (2) in the glaze slurry for a period of time and then take it out, and obtain a semi-finished ceramic hand mold after drying.

[0049] (5) Immerse the semi-finished ceramic hand mold prepared in step (4) in water for 3 s, then evenly spray ceramic microspheres onto the pitted areas using a sandblasting gun, and finally obtain the heat-conducting ceramic hand mold through firing.

[0050] Among them:

[0051] In step (1), during wet ball milling, the mass ratio of the water added to the mass of the green body raw materials is 0.8:1, and the wet ball milling time is 28 h.

[0052] In step (1), the static aging time is 24 h.

[0053] In step (2), the pressure for slip casting is 0.85 MPa, the drying temperature is 60 °C, and the drying time is 42 h.

[0054] In step (3), during wet ball milling, the mass ratio of the water added to the mass of the green body raw materials is 1.2:1, and the wet ball milling time is 22 h.

[0055] In step (3), the static aging time is 26 h.

[0056] In step (4), the number of glaze dipping times is 2 times, the glaze dipping time for each time is 5 s, the drying temperature is 85 °C, and the drying time is 6 h.

[0057] In step (5), the particle size of the ceramic microspheres is 0.5 mm, and the sandblasting pressure for pitting is 0.4 MPa.

[0058] In step (5), the firing is carried out by heating at a heating rate of 3.5 °C / min to 650 °C and holding for 50 min, then heating at a heating rate of 2.5 °C / min to 1280 °C and holding for 2 h, and finally cooling at a cooling rate of 2.5 °C / min to 810 °C, and then cooling in the furnace to room temperature.

[0059] Example 3

[0060] The preparation method of the heat-conducting ceramic hand mold described in this Example 3 consists of the following steps:

[0061] (1) Weigh the green body raw materials according to the weight ratio, then load them into a ball mill, add water and make them into green body slurry through wet ball milling. Finally, filter the green body slurry through a 325-mesh vibrating screen and let it stand for aging. Among them, the green body, in parts by weight, consists of the following raw materials: 47 parts of calcined kaolin, 24 parts of alumina, 18 parts of quartz sand, 11 parts of brown fused alumina, 6 parts of magnesite, 7 parts of diopside, 7 parts of chromium sesquioxide, 6 parts of titanium silicide, and 1.2 parts of niobium pentoxide;

[0062] (2) Adjust the specific gravity of the green body slurry after standing and aging in step (1) to 1.65 g / cm 3, then vacuuming for 2 hours, and finally performing slip casting to prepare a green semi-finished product, and drying the green semi-finished product;

[0063] (3) mixing the glaze raw materials according to the weight ratio, and then loading them into a ball mill, adding water and wet-milling them to prepare a glaze slurry. Finally, filtering the glaze slurry through a 350-mesh vibrating sieve and letting it stand for aging, wherein the glaze layer is composed of the following raw materials in parts by weight: 33 parts of quartz sand, 12 parts of calcined kaolin, 15 parts of sillimanite, 14 parts of borax, 8 parts of spodumene, 5 parts of lanthanum phosphate, 8 parts of zinc aluminate, 5 parts of aluminum borate, and 15 parts of calcium zirconate;

[0064] (4) Adjustment step (3) The specific gravity of the glaze layer slurry after standing and aging is 1.61g / cm 3 , then evacuate for 2 hours, immerse the semi-finished green body dried in step (2) in glaze slurry for a period of time, then take it out, and dry it to obtain a ceramic hand mold semi-finished product;

[0065] (5) Soak the semi-finished ceramic hand mold obtained in step (4) in water for 2 seconds, then use a sandblasting gun to evenly spray ceramic microspheres onto the pockmarks, and finally sinter to obtain a thermally conductive ceramic hand mold.

[0066] in:

[0067] In step (1), the mass ratio of water added during wet ball milling to the mass ratio of the green body raw material is 0.6:1, and the wet ball milling time is 26 hours.

[0068] The standing aging time in step (1) is 24 hours.

[0069] In step (2), the pressure of grouting molding is 0.80 MPa, the drying temperature is 55° C., and the drying time is 42 h.

[0070] In step (3), the mass ratio of water added during wet ball milling to the mass ratio of the green body raw material is 1.0:1, and the wet ball milling time is 20 hours.

[0071] The standing aging time in step (3) is 26 hours.

[0072] In step (4), the glaze dipping times are 2 times, each glaze dipping time is 5 seconds, the drying temperature is 83°C, and the drying time is 6 hours.

[0073] In step (5), the particle size of the ceramic microspheres is 0.5 mm, and the sandblasting pressure is 0.4 MPa.

[0074] In step (5), the firing process is as follows: heating at a rate of 3.5 °C / min to 640 °C and holding for 50 min, then heating at a rate of 2.5 °C / min to 1270 °C and holding for 2 h, and finally cooling at a rate of 2.5 °C / min to 800 °C, followed by furnace cooling to room temperature.

[0075] Comparative Example 1

[0076] The preparation method of the heat-conducting ceramic hand mold described in this Comparative Example 1 is the same as that of Example 1. The only difference is that chromium sesquioxide, titanium silicide, and niobium pentoxide are no longer added to the green body raw materials described in step (1) of Comparative Example 1.

[0077] Comparative Example 2

[0078] The preparation method of the heat-conducting ceramic hand mold described in this Comparative Example 2 is the same as that of Example 1. The only difference is that lanthanum phosphate, zinc aluminate, aluminum borate, and calcium zirconate are no longer added to the glaze layer raw materials described in step (3) of Comparative Example 2.

[0079] Comparative Example 3

[0080] The preparation method of the heat-conducting ceramic hand mold described in Comparative Example 3 is the same as that of Example 1. The only difference is that the heat-conducting ceramic hand mold described in Comparative Example 3 no longer has a glaze layer.

[0081] Performance tests were carried out on the heat-conducting ceramic hand molds prepared in Examples 1-3 and Comparative Examples 1-3, and the results are shown in Table 1 below: Acid and alkali resistance test method: In a sulfuric acid solution (10 wt%) or sodium hydroxide solution (10 wt %) medium, boil gently for 1.5 hours. The percentage of the mass of the specimen after corrosion to the initial mass of the specimen is the acid resistance / alkali resistance of the heat-conducting ceramic hand mold; The thermal shock resistance was tested according to the method for determining the thermal shock resistance of daily-use ceramic ware GB / T3298-2022 (the product was heated to 180 °C, held for 30 min, and then put into water at 20 ± 2 °C for heat exchange, and the number of heat exchanges was recorded); The thermal conductivity was tested according to the laser flash method.

[0082] Table 1 Performance test results of the heat-conducting ceramic hand molds prepared in Examples 1-3 and Comparative Examples 1-3

[0083]

Claims

1. A preparation method of a heat-conducting ceramic hand mold, characterized in that: It consists of the following steps: (1) The green body raw materials are mixed according to the weight ratio, and then loaded into a ball mill, water is added, and wet ball milling is performed to form a green body slurry. Finally, the green body slurry is filtered through a 325-mesh vibrating screen and then left to age. The green body is composed of the following raw materials in parts by weight: 45-47 parts of calcined kaolin, 24-26 parts of alumina, 16-18 parts of quartz sand, 11-13 parts of brown corundum, 6-8 parts of magnesite, 5-7 parts of diopside, 7-8 parts of chromium trioxide, 5-6 parts of titanium silicide, and 1.2-1.4 parts of niobium pentoxide; (2)Adjust the specific gravity of the body slurry after standing and aging in step (1) to 1.65 g / cm 3 -1.67 g / cm 3 , then evacuate for 2 - 3 h, and finally carry out slip casting to prepare a semi-finished body, and perform drying treatment on the semi-finished body; (3) mixing the glaze raw materials according to a weight ratio, and then loading them into a ball mill, adding water, and wet-milling them to prepare a glaze slurry. Finally, filtering the glaze slurry through a 350-mesh vibrating sieve, and then standing to age, wherein the glaze layer is composed of the following raw materials in parts by weight: 33-35 parts of quartz sand, 12-13 parts of calcined kaolin, 14-15 parts of sillimanite, 13-14 parts of borax, 8-10 parts of spodumene, 3-5 parts of lanthanum phosphate, 8-10 parts of zinc aluminate, 5-7 parts of aluminum borate, and 13-15 parts of calcium zirconate; (4)Adjust the specific gravity of the glaze layer slurry after standing and aging in step (3) to 1.61 g / cm 3 -1.63 g / cm 3 , then evacuate for 2 - 3 h, immerse the semi-finished blank body treated by drying in step (2) in the glaze layer slurry for a period of time and then take it out, and obtain the semi-finished ceramic hand mold through drying. (5) Soaking the semi-finished ceramic hand mold obtained in step (4) in water for 2-3 seconds, then using a sandblasting gun to evenly spray ceramic microspheres onto the pockmarks, and finally sintering to obtain a thermally conductive ceramic hand mold; in: In step (4), the glaze dipping times are 2 times, each glaze dipping time is 5 seconds, the drying temperature is 83-85°C, and the drying time is 6 hours; In step (5), the particle size of the ceramic microspheres is 0.5 mm, and the sandblasting pressure is 0.4 MPa; The sintering in step (5) is to heat up to 640-650°C at a heating rate of 3.5°C / min and keep the temperature for 50 minutes, then heat up to 1270-1280°C at a heating rate of 2.5°C / min and keep the temperature for 2 hours, and finally cool to 800-810°C at a cooling rate of 2.5°C / min, and then cool to room temperature in the furnace.

2. The preparation method of the heat-conducting ceramic hand mold according to claim 1, characterized in that: In step (1), the mass ratio of water added during wet ball milling to the mass ratio of the green body raw material is 0.6-0.8:1, and the wet ball milling time is 26-28h.

3. The preparation method of the heat-conducting ceramic hand mold according to claim 1, characterized in that: The standing aging time in step (1) is 24 hours.

4. The preparation method of the heat-conducting ceramic hand mold according to claim 1, characterized in that: In step (2), the pressure of the grouting molding is 0.8-0.85 MPa, the drying temperature is 55-60° C., and the drying time is 42 h.

5. The preparation method of the heat-conducting ceramic hand mold according to claim 1, characterized in that: In step (3), the mass ratio of water added during wet ball milling to the mass ratio of the green body raw material is 1.0-1.2:1, and the wet ball milling time is 20-22h.

6. The preparation method of the heat-conducting ceramic hand mold according to claim 1, characterized in that: The standing aging time in step (3) is 26 hours.

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