Tubular, continuous, seamless, compressible, resilient mounting articles and pollution control devices comprising the same

A technology for installing products and pollution control components, applied in the direction of tubular articles, mufflers, exhaust devices, etc., can solve the problems of reducing the installation performance of the pad, shearing the pad, and detrimental to the internal strength of the pad, etc.

Inactive Publication Date: 2012-05-30
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In relatively low temperature applications (e.g., diesel particulate filters), typical organic content (9% by weight or higher) can lead to reduced mat installation performance, because changes in the binder during use are usually not Facilitate the physical properties of the pad (e.g., due to hardening or reduced elasticity)
Reducing the total organic content generally results in improved performance of the mounting pad, but can be detrimental to the internal strength of the pad, causing the pad to shear during encapsulation

Method used

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  • Tubular, continuous, seamless, compressible, resilient mounting articles and pollution control devices comprising the same
  • Tubular, continuous, seamless, compressible, resilient mounting articles and pollution control devices comprising the same
  • Tubular, continuous, seamless, compressible, resilient mounting articles and pollution control devices comprising the same

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0062] 2.7 kg of annealed ceramic fiber (obtained under the trade designation "CERAFIBER" from Thermal Ceramics (Augusta, GA)) was slowly added to 189 liters (50 gallons) of water while using a low shear industrial mixer at about 400 rpm Minute speed for mixing. When all the fibers were dispersed and no clusters remained, 273 grams of latex (aqueous emulsion of ethylene vinyl acrylate terpolymer with 55% by weight solids, available from Air Products (Philadelphia, Pa.)). After the latex was added, 13.65 grams of polymer blend (50% solids; available under the trade designation "MP 9307C" from Mid South, Ringgold, LA) was added, followed by 17.3 grams of antifoam (available under the trade designation "FOAMASTER III") from Henkel in Germany). An additional 94.6 liters (25 gallons) of water were then added to the slurry.

[0063] About 38 liters (10 gallons) of the above slurry was pumped into the forming tank. Cylindrical preforms were prepared by dipping the screen side of ...

example 2

[0066] A second non-expanded cylinder was molded as described in Example 1. It was slid onto a ceramic monolith having an outer diameter of about 11.8 cm and a length of 15.2 cm until it was axially equidistant from both ends. The diameter of the monolith is about 2 mm smaller than the inner diameter of the mounting article.

[0067] A heat-shrinkable polyethylene tube having an inner diameter approximately 5 mm larger than the single piece of the wrapping mat and a width approximately 40 mm wider than the length of the mounting article was slid onto the mounting article. The mounting article is compressed onto the single piece using a heat gun to heat the film until the film shrinks tightly onto the mounting article. The mounting article is completely encapsulated by the film. The cylindrical mounting article is tightly fixed to the surface of the single piece and does not move relative to the single piece when the single piece surrounding the pad is dropped onto a tabletop...

example 3

[0069]6.4 kg of ceramic fiber (obtained from Unifrax Corp. (Niagara Falls, NY) under the trade designation "7000M") was slowly added to 210 liters (53.2 gallons) of water while utilizing a low shear industrial mixer at approximately 400 rpm Minute speed for mixing. While continuing to mix, the following materials were added in order: 114 grams of sodium aluminate (31.5% solids by weight), 2436 grams of latex (45.5% solids by weight; available from Rohm & Haas (Philadelphia, Pa. )), 36 g of defoamer (obtained under the trade designation "FOAMASTER III" from Henkel, Germany), 440 g of aluminum sulfate (50% solids by weight). Then 10.3 kg of unexpanded vermiculite (from Cometals Inc.) was added to the slurry and an additional 189 liters (50 gallons) of water were added.

[0070] About 38 liters (10 gallons) of the above slurry was pumped into a forming tank and a preform was formed as described in Example 1 except that the preform was kept in a drying oven at 150°C for about 3 h...

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Abstract

Tubular, continuous, seamless, compressible, resilient mounting article comprising inorganic fibers, and having an inner curved surface, a central longitudinal axis, and a uniform internal cross-sectional area along the central longitudinal axis. The mounting articles are useful, for example, in mounting pollution control elements in pollution control devices.

Description

Background technique [0001] Pollution control devices such as catalytic converters for gasoline engines have been known for more than 30 years. Over the past few years, stricter regulations for diesel vehicles have led to a rapid adoption of other pollution control devices, including diesel oxidation catalysts (DOC), diesel particulate filters (DPF) and selective catalytic reduction devices (SCR) Increase. Such pollution control devices typically include a metal housing or housing with a pollution control element securely mounted within the housing by resilient and flexible mounting pads. Catalytic converters, including diesel oxidation converters, contain a catalyst, usually coated on a monolithic structure. The monolithic structure is usually ceramic, although metallic monoliths are also known. Catalysts in gasoline engines control air pollution by oxidizing carbon monoxide and hydrocarbons and reducing nitrogen oxides. Diesel oxidation catalysts oxidize the soluble orga...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B1/08B32B33/00F01N3/28
CPCF01N3/2857B32B1/08F01N3/2853B32B3/04B32B5/022B32B9/005B32B9/007B32B9/045B32B27/12B32B2260/021B32B2260/046B32B2262/10B32B2307/30B32B2307/718B32B2307/72B32B2307/736B32B2597/00B32B2605/00Y10T29/49826Y10T428/13
Inventor 理查德・P・梅里哈维尔・E・冈萨雷斯
Owner 3M INNOVATIVE PROPERTIES CO
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