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A kind of mullite liner outer layer for automobile exhaust catalyst and preparation method

A technology of automobile exhaust and mullite, which is applied in the field of refractory and heat insulation materials

Active Publication Date: 2016-02-10
湖州南浔旧馆頔南工程建设有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This patent involves the production and manufacture of mullite fiber, which requires large-scale production of raw materials and has not been widely used in the industry.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0029] A kind of preparation method of the mullite liner outer layer that automobile exhaust catalyst is used as above, this preparation method comprises the steps:

[0030] a) Weigh each raw material according to the proportion, mix it evenly, and obtain the slurry through mixing;

[0031] b) Then, it is formed by suction filtration, and dried at a temperature of 190-210°C for 10 hours to obtain the finished product.

[0032] The performance indicators of the finished product are as follows: linear shrinkage rate -6 / ℃, thermal conductivity from 0.10-0.23w / mk, tensile strength ≥0.35MPa, bulk density from 200-260kg / m 3 , refractoriness > 1800, maximum service temperature > 1500°C, fiber length maintained at 5-9um.

Embodiment 1

[0034] Example 1: Put 100 parts of mullite fiber and 0.5 parts of silane coupling agent KH550 in an industrial mixer, add 120 parts of water, add 5 parts of 5wt% glycerin, and stir the mixture slowly at 100 rpm After 2 hours in the upper layer, add an appropriate amount of boiling water, adjust the water temperature to 40°C, then add 10 parts of epoxy resin, add ammonia water, adjust the pH value to 5, and stir at a medium speed of 500 rpm for 4 hours. Then add tap water to rinse until neutral, filter, and dry in an oven at 80°C. The detection and analysis results before and after modification show that: 72.43wt%Al in the modified mullite fiber 2 o 3 , 25.96%wtSiO 2 , oily substance 1.52wt%; fiber length 8-10um.

[0035] The formula of the outer layer of the liner is 60wt% of modified mullite fiber, 20wt% of calcined alumina powder, 10wt% of silica sol, 1.2wt% of sodium hypochlorite, 7.3wt% of starch, and 1.5wt% of methylcellulose. Mix evenly and knead to obtain a slurry, ...

Embodiment 2

[0036] Example 2: Put 100 parts of mullite fiber and 1 part of silane coupling agent KH560 in an industrial mixer, add 120 parts of water, add 10 parts of 5wt% glycerin, and stir the mixture at a slow speed at 100 rpm After 2 hours in the upper layer, add an appropriate amount of boiling water, adjust the water temperature to 60°C, then add 10 parts of epoxy resin, add ammonia water, adjust the pH value to 6, and stir at a medium speed of 500 rpm for 4 hours. Then add tap water to rinse until neutral, filter, and dry in an oven at 90°C. The detection and analysis results before and after modification show that: 70.12wt%Al in the modified mullite fiber 2 o 3 , 24.14wt% SiO 2 , oily substance 5.74wt%; fiber length 8-12um.

[0037] The formula of the outer layer of the liner is 85% of modified mullite fiber, 5% of calcined alumina micropowder, 3% of silica sol, 3.8% of sodium hypochlorite, 2.7% of starch, and 0.5% of methyl cellulose. Mix evenly and knead to obtain a slurry, ...

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Abstract

A mullite liner outer layer for an auto-exhaust catalyst and a preparation method thereof are provided. The mullite liner outer layer is composed of the following components by weight percentage: 60-85% of a modified mullite fiber, 5-10% of a calcined alumina micro-powder, 3-10% of silica sol, 1.2-3.8% of sodium hypochlorite, 2.7-7.3% of starch, and 0.5-1.5% of an additive, wherein the sum of the contents of the components is 100%. The modified mullite fiber comprises the chemical components by weight: not less than 70% of Al2O3, not more than 25% of SiO2, and more than 1.5% of an oily substance, wherein the sum of the contents of the chemical components is 100 wt%. The preparation method comprises the steps: a) weighing the raw materials according to the proportion, mixing evenly, and thus obtaining a slurry through mixing; and b) then carrying out suction filtration molding, and drying at a temperature of 190-210 DEG C for 10 h to obtain the finished product. With utilization of the modified mullite fiber as the main raw material and under a condition of overcoming pulverization, an excellent refractory property of the product is ensured.

Description

technical field [0001] The invention relates to a mullite liner outer layer for automobile exhaust catalysts and a preparation method thereof, belonging to the technical field of fire-resistant and heat-insulating materials. Background technique [0002] With the booming production and sales in China's auto market, there is huge pressure on environmental protection and strong demand for exhaust gas treatment catalysts. Automobile exhaust has become a major mobile pollution source in human society, endangering people's health. Automobile exhaust three-way catalytic converter and EFI closed-loop control are one of the effective measures to solve automobile exhaust pollution. Generally, the three-way catalytic converter for automobile exhaust gas is composed of three-way catalyst, liner, shell and other parts, among which the three-way catalyst plays the role of catalytic purification. With the further improvement of emission standards, the catalyst needs to increase the numb...

Claims

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Application Information

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IPC IPC(8): C04B28/24C04B14/38
Inventor 伊国民
Owner 湖州南浔旧馆頔南工程建设有限公司
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