Impregnating method of preparing isostatic pressing graphite product

Abstract

The invention discloses an impregnating method of preparing an isostatic pressing graphite product. The impregnating method comprises the following steps: preheating the isostatic pressing graphite product by raising the temperature from room temperature to 330 DEG C; placing the preheated isostatic pressing graphite product in liquid asphalt to form an impregnating system, and applying pressure to the impregnating system, wherein the temperature of the liquid asphalt is 180-220 DEG C; after the applied pressure remains unchanged, cooling the impregnating system under the condition of pressurization until the temperature is 50-60 DEG C; and heating the cooled impregnating system until the temperature of asphalt in the impregnating system is above a softening point, while stopping heating when the temperature of the surface of the product is at the softening point of the asphalt, meanwhile, reducing the pressure of the impregnating system, discharging the asphalt, then cooling the impregnating system again until the temperature is 60-80 DEG C, and finishing impregnation. According to the impregnating method disclosed by the invention, isostatic pressing graphite is uniformly and deeply impregnated in the impregnating process, the problems of cracking, bursting and the like in the whole impregnating process do not occur, the growth rate of the impregnated graphite product is increased, and the asphalt on the surface of the graphite product can be recycled again.

Description

technical field

[0001] The invention relates to a method for preparing an isostatic graphite product, in particular to an impregnation method for preparing an isostatic graphite product. Background technique

[0002] At present, the impregnation process of high-grade graphite products adopts gaseous pressurization. Due to the limitation of pressurized pressure, the impregnation depth of graphite products is not enough, the uniformity is poor, and the weight gain rate is low. Therefore, high-grade isostatic graphite products cannot be produced. In order to achieve the ideal state, the repeated cycle of the dipping process increases the cost and prolongs the production cycle.

[0003] Now we have the impregnation technology of isostatic graphite products mainly from the impregnation process of high-grade graphite products. It has a large particle size ratio, and it is pressed from a powder that is 4 times finer than flour. Therefore, the preparation method of ordinary graphi...

Examples

Embodiment 1

[0035]The isostatic graphite product was heated freely from room temperature to 180°C for 3 hours, then raised to 210°C at a rate of 10°C / h, then to 255°C at a rate of 8°C / h, and then to 255°C at a rate of 5°C / h 330°C, keep warm for 5 hours, and carry out preheating treatment; the preheated isostatic pressed product is placed in the impregnation equipment, vacuumized, and then the impregnation equipment is injected with liquid asphalt at a temperature of 220°C to form an impregnation system, and the pressure applied to the impregnation system is 1.7-1.85Mpa, carry out impregnation treatment; after the applied pressure remains unchanged, cool the impregnation system to 55°C at a cooling rate of 55-65°C / h while maintaining the pressure: the cooled impregnation system Heating until the temperature of the asphalt in the impregnation system is above the softening point and the fluidity is good, and when the surface temperature of the product reaches the asphalt softening point of 90...

Embodiment 2

[0037] The isostatic graphite product is heated freely from room temperature to 180°C for 3 hours, then heated to 200°C at a rate of 15°C / h, then raised to 260°C at a rate of 9°C / h, and then heated to 320°C, keep warm for 4 hours, and carry out preheating treatment; the preheated isostatic pressed product is placed in the impregnation equipment, vacuumized, and then injected into the impregnation equipment with liquid asphalt at a temperature of 200°C to form an impregnation system, and the pressure applied to the impregnation system is 1.7-1.85Mpa, carry out impregnation treatment; after the applied pressure remains unchanged, cool the impregnation system to 60°C at a cooling rate of 55-65°C / h while maintaining the pressure: the cooled impregnation system Heating until the temperature of the asphalt in the impregnation system is above the softening point and the fluidity is good, and when the surface temperature of the product reaches the softening point of 85°C, stop heating....

Embodiment 3

[0039] The isostatic graphite product was heated freely from room temperature to 180°C for 4 hours, then raised to 205°C at a rate of 9°C / h, then to 255°C at a rate of 6°C / h, and then to 330°C, keep warm for 3 hours, and carry out preheating treatment; the preheated isostatic pressed product is placed in the impregnation equipment, vacuumized, and then the impregnation equipment is injected with liquid asphalt at a temperature of 190°C to form an impregnation system, and the pressure applied to the impregnation system is 1.7-1.85Mpa, carry out impregnation treatment; after the applied pressure remains unchanged, cool the impregnation system to 50°C at a cooling rate of 55-65°C / h while maintaining the pressure: the cooled impregnation system Heating until the temperature of the asphalt in the impregnation system is above the softening point and the fluidity is good, and when the surface temperature of the product reaches the softening point of 80°C, stop heating. At the same tim...

technical field

[0001] The invention relates to a method for preparing an isostatic graphite product, in particular to an impregnation method for preparing an isostatic graphite product. Background technique

[0002] At present, the impregnation process of high-grade graphite products adopts gaseous pressurization. Due to the limitation of pressurized pressure, the impregnation depth of graphite products is not enough, the uniformity is poor, and the weight gain rate is low. Therefore, high-grade isostatic graphite products cannot be produced. In order to achieve the ideal state, the repeated cycle of the dipping process increases the cost and prolongs the production cycle.

[0003] Now we have the impregnation technology of isostatic graphite products mainly from the impregnation process of high-grade graphite products. It has a large particle size ratio, and it is pressed from a powder that is 4 times finer than flour. Therefore, the preparation method of ordinary graphi...

Examples

Embodiment 1

[0035]The isostatic graphite product was heated freely from room temperature to 180°C for 3 hours, then raised to 210°C at a rate of 10°C / h, then to 255°C at a rate of 8°C / h, and then to 255°C at a rate of 5°C / h 330°C, keep warm for 5 hours, and carry out preheating treatment; the preheated isostatic pressed product is placed in the impregnation equipment, vacuumized, and then the impregnation equipment is injected with liquid asphalt at a temperature of 220°C to form an impregnation system, and the pressure applied to the impregnation system is 1.7-1.85Mpa, carry out impregnation treatment; after the applied pressure remains unchanged, cool the impregnation system to 55°C at a cooling rate of 55-65°C / h while maintaining the pressure: the cooled impregnation system Heating until the temperature of the asphalt in the impregnation system is above the softening point and the fluidity is good, and when the surface temperature of the product reaches the asphalt softening point of 90...

Embodiment 2

[0037] The isostatic graphite product is heated freely from room temperature to 180°C for 3 hours, then heated to 200°C at a rate of 15°C / h, then raised to 260°C at a rate of 9°C / h, and then heated to 320°C, keep warm for 4 hours, and carry out preheating treatment; the preheated isostatic pressed product is placed in the impregnation equipment, vacuumized, and then injected into the impregnation equipment with liquid asphalt at a temperature of 200°C to form an impregnation system, and the pressure applied to the impregnation system is 1.7-1.85Mpa, carry out impregnation treatment; after the applied pressure remains unchanged, cool the impregnation system to 60°C at a cooling rate of 55-65°C / h while maintaining the pressure: the cooled impregnation system Heating until the temperature of the asphalt in the impregnation system is above the softening point and the fluidity is good, and when the surface temperature of the product reaches the softening point of 85°C, stop heating....

Embodiment 3

[0039] The isostatic graphite product was heated freely from room temperature to 180°C for 4 hours, then raised to 205°C at a rate of 9°C / h, then to 255°C at a rate of 6°C / h, and then to 330°C, keep warm for 3 hours, and carry out preheating treatment; the preheated isostatic pressed product is placed in the impregnation equipment, vacuumized, and then the impregnation equipment is injected with liquid asphalt at a temperature of 190°C to form an impregnation system, and the pressure applied to the impregnation system is 1.7-1.85Mpa, carry out impregnation treatment; after the applied pressure remains unchanged, cool the impregnation system to 50°C at a cooling rate of 55-65°C / h while maintaining the pressure: the cooled impregnation system Heating until the temperature of the asphalt in the impregnation system is above the softening point and the fluidity is good, and when the surface temperature of the product reaches the softening point of 80°C, stop heating. At the same tim...

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