Preparation method of low-density porous thermal insulation material for industrial furnaces

Abstract

The invention relates to the technical field of preparation of thermal field materials for industrial furnaces, in particular to a preparation method of a low-density porous thermal insulation material for industrial furnaces, which comprises the following steps of (1) crushing various carbon fiber products to prepare chopped carbon fibers, (2) carrying out surface treatment on the chopped carbon fibers, (3) putting the chopped carbon fibers, thermosetting phenolic resin powder and high-purity graphite powder into a ball mill according to a mass ratio of 20: 30: 1, and mixing for 8-15 hours, (4) putting into a heat-resistant steel container, then putting the container into a pressure container, and carrying out medium-pressure foaming and curing shaping treatment, (5) carrying out carbonization treatment, (6) performing high-temperature purification treatment, and (7) performing finish machining according to the design size of a product drawing to obtain the low-density porous heat-insulating composite material finished product for the industrial furnace. The problems of long production period, high manufacturing cost, poor designability, unstable product quality consistency and the like of the existing thermal insulation material product for the high-temperature furnace can be solved.

Description

technical field [0001] The invention relates to the technical field of preparation of thermal field materials for industrial furnaces, in particular to a preparation method of low-density porous insulation materials for industrial furnaces. Background technique [0002] In recent years, with the continuous development of powder metallurgy and photovoltaic industries, related enterprises have higher and higher requirements for controlling production costs, improving product size, production capacity and quality. As the main production equipment, various high-temperature furnaces (vacuum furnace, pressure Furnaces, polycrystalline ingot furnaces, single crystal growth furnaces, etc.) are also becoming larger and larger, which puts forward higher requirements for the performance of thermal field insulation materials. Generally speaking, it is necessary to improve The best performance is reflected in the following aspects: First, it has a lower thermal conductivity (that is, bet...

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Problems solved by technology

[0006] Using the first preparation process to make thermal insulation materials is only suitable for the preparation of products with a cylindrical structure, and because the soft carbon felt is used for winding production, the working environment is poor and the dimensional accuracy is not high, so this plan is mostly used for on-site production by the equipment user. , the entire production and installation process requires the equipment to be shut down, and considering the short service life of the soft carbon felt, the replacement is relatively frequent, which has a great impact on the overall utilization rate of the equipment

[0007] Using the second preparation process to make insulation materials, flat and cylindrical products can be produced. Since the product has been cured, it can be machined, and the accuracy is relatively guaranteed. However, because this process uses carbon felt brushing and bonding Therefore, there will be differences in the relative density of the felt body at the bonding surface and the splicing place, which will affect the overall quality consistency of the product, and then affect the temperature uniformity in the furnace. In addition, due to the high temperature of the adhesive The lower strength is not high, so the overall mechanical strength of the product is not high, and it is prone to delamination when making large-sized products

[0008] The third preparation process is used to make thermal insulation materials, and flat and cylindrical products can also be produced. Compared with the first two processes, this process technology has been developed in recent years and is specially used for the production of high-end thermal insulation materials. Its products The performance is better than the previous two processes, but the biggest problem of this process is that there is an upper limit on the size (mainly thickness) of the prefabricated body. At present, the maximum thickness can only be about 50mm. As a raw material, chemical vapor deposition is used for densification, so the production cost is relatively high

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