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Method for preparing wall-flow honeycomb ceramic filter

A technology of honeycomb ceramics and filters, which is applied in the field of preparation of wall-flow honeycomb ceramic filters, can solve the problems of high thermal expansion coefficient and mechanical strength, and achieve good results

Inactive Publication Date: 2009-12-30
JIANGSU GAOCHUN CERAMICS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] However, the thermal expansion coefficient of the existing wall-flow honeycomb ceramics is large, and the mechanical strength needs to be improved, especially for large-scale wall-flow honeycomb ceramics. The wall-flow honeycomb ceramic filter body needs to be improved.

Method used

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  • Method for preparing wall-flow honeycomb ceramic filter
  • Method for preparing wall-flow honeycomb ceramic filter
  • Method for preparing wall-flow honeycomb ceramic filter

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Embodiment Construction

[0020] Wall-flow honeycomb ceramic filter such as figure 1 , figure 2 Shown: 1 is the outermost wall, 2 is the closed cell at the end, 3 is the opening at the end, and 4 is the filter wall.

[0021] The embodiment of the wall-flow type honeycomb ceramic filter body comprises raw material processing, molding and firing, and concrete technical route is as follows (see image 3 ):

[0022]First, 35-45 parts of kaolin, with an average particle size of ≤5 μm, 20-30 parts of talc, with an average particle size of 15 μm, 4-9 parts of α-alumina, with an average particle size of ≤2 μm, and pore-forming agents (including carbon particles or organic High polymer molecular particles can also be a mixture of the two, and the weight ratio of the two mixed is 2-8:8-2; carbon particles include coal powder, and organic polymer particles include various high-molecular particles or fibrous polymers, such as Polyethylene, polypropylene, polyester can all be burned at high temperature) 5-15 pa...

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Abstract

The invention relates to a method for preparing a wall-flow honeycomb ceramic filter, which combines a cordierite honeycomb ceramics material and a special pore-forming agent. Raw materials comprise the following components, mass portions and grain diameters: kaolin is 35 to 45 portions, and the average grain diameter is less than or equal to 5 mu m; talcum is 20 to 30 portions, and the average grain diameter is 15 mu m; alpha-alumina is 4 to 9 portions, and the average grain diameter is less than or equal to 2 mu m; the pore-forming agent consisting of carbon granules or / and organic polymeric particles is 5 to 15 portions, and the average grain diameter is 10 to 20 mu m; and a bonding agent is 3 to 7 portions. The method comprises the following steps: evenly mixing the components and 20 to 30 portions of water to prepare a blank; completing the conversion from the blank to plastic mud after performing vacuum degassing for 2 to 3 times; staling the plastic mud for 24+ / -8 hours, and squeezing out the plastic mud through a mould of an extruder; performing microwave drying on the plastic mud to obtain a dry blank; and performing cross hole blocking, drying, skin grafting and trimming on the dry blank, and finally performing a sintering working procedure to manufacture a product.

Description

technical field [0001] The invention relates to a preparation method of a wall-flow honeycomb ceramic filter body for trapping diesel engine exhaust particles. Background technique [0002] The wall-flow honeycomb ceramic filter is currently the most commonly used diesel particulate filter (DPF for short). The purpose of filtering particles (working principle see figure 2 ), the filtration efficiency can exceed 90%. Diesel engine exhaust contains a large number of particles, which are small in size and light in weight, and can be suspended in the atmosphere for a long time. They are easily inhaled by the human body and deposited in the alveoli. They are an important source of pollution in cities and towns. However, due to the economy, strong power, good performance and long service life of diesel vehicles, diesel vehicles have become the transportation tools for future development at home and abroad. In order to improve the environmental protection performance of diesel v...

Claims

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Application Information

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IPC IPC(8): B01D39/20B28B3/20B28B11/00F01N3/022
Inventor 孔德双谷昌军孔秋明李建国郑南孔令仁
Owner JIANGSU GAOCHUN CERAMICS
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