Re-preheating impregnation method for unqualified impregnated graphite product

A graphite impregnation treatment technology, which is applied in the field of re-preheating impregnation of unqualified graphite impregnation products, can solve problems such as uneven impregnation and asphalt coking, and achieve the effect of reducing the impact

Active Publication Date: 2016-01-27
大同市腾扬科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, the preheating temperature rise is divided into four stages, which can solve the problem of uneven impregnation caused by the asphalt part inside the impregnated product caused by the mismatch of the preheating curve, and the impregnated liquid cannot enter the interior evenly, which can prevent subsequent processing. Problems of scrapping and cracking appear in the process, so as to recover unnecessary losses for the company

Method used

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  • Re-preheating impregnation method for unqualified impregnated graphite product
  • Re-preheating impregnation method for unqualified impregnated graphite product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] 1. Preheat

[0051] (1) Freely heat up unqualified graphite impregnated products from ambient temperature to 145°C;

[0052] (2) Then raise the temperature to 195°C at a heating rate of 3.5°C / h. After this stage is completed, remove the impurities on the outer surface of the product;

[0053] (3) Then raise the temperature to 315°C at a heating rate of 12.5°C / h, and clean the impurities on the surface again after being released from the furnace;

[0054] (4) Finally, keep the temperature at 315°C for 6 hours, and the preheating is over;

[0055] 2. Dipping

[0056] The preheated unqualified graphite impregnated products are placed in the impregnating equipment, vacuumized, the vacuum degree is -0.086MPa, and then the asphalt is injected into the impregnating equipment to form an impregnating system, and the impregnating system is applied with a pressure of 1.7-1.85Mpa for impregnation For processing, keep the pressure constant for 8 hours, then inject normal temperat...

Embodiment 2

[0058] 1. Preheat

[0059] (1) Freely raise the temperature of unqualified graphite impregnated products from ambient temperature to 150°C;

[0060] (2) Then raise the temperature to 200°C at a heating rate of 3.5°C / h. After this stage is completed, remove the impurities on the outer surface of the product;

[0061] (3) Then raise the temperature to 320°C at a heating rate of 12.5°C / h, and clean the impurities on the surface again after being released from the furnace;

[0062] (4) Finally, keep the temperature at 320°C for 6 hours, and the preheating is over;

[0063] 2. Dipping

[0064] The preheated unqualified graphite impregnated products are placed in the impregnating equipment, vacuumized, the vacuum degree is -0.086MPa, and then the asphalt is injected into the impregnating equipment to form an impregnating system, and the impregnating system is applied with a pressure of 1.7-1.85Mpa for impregnation For processing, keep the pressure constant for 8 hours, then injec...

Embodiment 3

[0066] 1. Preheat

[0067] (1) Freely heat up unqualified graphite impregnated products from ambient temperature to 155°C;

[0068] (2) Then the temperature is raised to 205°C at a heating rate of 3.5°C / h. After this stage is completed, the impurities on the outer surface of the product are removed;

[0069] (3) Then raise the temperature to 325°C at a heating rate of 12.5°C / h, and clean the impurities on the surface again after being released from the furnace;

[0070] (4) Finally, keep the temperature at 325°C for 6 hours, and the preheating is over;

[0071] 2. Dipping

[0072] The preheated unqualified graphite impregnated products are placed in the impregnating equipment, vacuumized, the vacuum degree is -0.086MPa, and then the asphalt is injected into the impregnating equipment to form an impregnating system, and the impregnating system is applied with a pressure of 1.7-1.85Mpa for impregnation For processing, keep the pressure constant for 8 hours, then inject normal...

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Abstract

The invention discloses a re-preheating impregnation method for an unqualified impregnated graphite product. The method includes preheating and impregnation. The preheating comprises: preheating the unqualified impregnated graphite product from environment temperature to 320+ / -5DEG C, wherein the preheating is carried out according to the following preheating curve: heating the unqualified impregnated graphite product from environment temperature to 150+ / -5DEG C; further heating the unqualified impregnated graphite product already heated to 150+ / -5DEG C to 200+ / -5DEG C; further heating the unqualified impregnated graphite product already heated to 200+ / -5DEG C to 320+ / -5DEG C; and maintaining the unqualified impregnated graphite product at 320+ / -5DEG C to carry out constant temperature treatment. With the re-preheating impregnation method provided by the invention, during re-impregnation of the unqualified impregnated graphite product, the surface coal tar pitch cannot coke and affect the access of impregnation liquid into the product to cause serious uneven impregnation, and wasting of unqualified impregnated graphite products and other problems can be reduced.

Description

technical field [0001] The invention belongs to the field of impregnation processing of graphite products, and in particular relates to a re-preheating impregnation method for unqualified graphite impregnated products. Background technique [0002] Normal impregnation of graphite products will often affect the weight gain index and effect of impregnated products due to some special reasons, resulting in insufficient impregnation depth, poor uniformity, and low weight gain rate in some products after impregnation. Graphite products are collectively referred to as unqualified graphite impregnated products. However, these unqualified phenomena are often the key to the success of subsequent processing. If there are products with such phenomena, the scrap rate in the later stage will reach more than 90%, but the existing technology can only save 20%-30% of unqualified graphite impregnated Taste. [0003] The existing technology is to process unqualified graphite impregnated pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/85
Inventor 刘伟凯张培林赤九林张培模庞中海张翔赵利
Owner 大同市腾扬科技有限公司
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