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Multilayer intumescent sheet

A technology of expansion sheet and expansion layer, which is applied to the above-mentioned device field equipped with flexible multi-layer expansion sheets, and can solve the problems of pollution control devices and the like

Inactive Publication Date: 2000-03-08
3M CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Despite the uses and benefits of existing fastening materials, improvements are needed for fastening materials used in pollution control devices

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-5

[0140] 100 lbs (45.4 kg) of ceramic fiber (FIBERFRAX TM 7000M, available from Unifrax Co., Niagara Falls, NY) was slushed in 960 gallons (3,634 liters) of water for one minute. The fiber stock was then transferred to a 2,000 gallon (7,520 liter) stock chest and diluted with 140 gallon (526 liter) of water. While stirring, add 39 pounds (17.7kg) of 45.5% solid latex (RHOPLEX  HA-8, available from ROHM & HAAS, Philadelphia, PA). 11 pounds (5.0 kg) of aluminum sulfate (50% solids) was then added to coagulate the latex. This latex-fiber paste is given the designation A below.

[0141] A second slurry was prepared as follows: 100 pounds (45.4 kg) of ceramic fiber (EIBERFRAX TM 7000M) was slurried in 960 gallons (3,634 liters) of water and mixed for 1 minute. Add 43 lbs (19.5 kg) of expanded vermiculite (ZONOLITE  #5, available from W.R. Grace Co., Cambridge, MA) and mixed until dispersed. The fiber-expanded vermiculite slurry was pumped into a 1500 gallon (5,678 L) slurr...

Embodiment 6

[0144] 75 lbs (34.1 kg) of ceramic fiber (FIBERFRAX TM 7000M) was slurried in 400 gallons (1514 liters) of water for 90 seconds. It was then transferred to a 2,000-gallon (7,520-liter) pulp chest. Another 75 pounds (34.1kg) of ceramic fiber (FIBERFRAX TM 7000M) was slurried as above, transferred to the 2000 gallon (7570 liters) stock chest, and the combined stock was diluted with 250 gallons (946 liters) of fresh water. While stirring, add 22 pounds (10kg) latex (AIRFLEX TM 600BP, 55% solids), 3.3 pounds (1.5kg) liquid sodium aluminate (NALCO TM 2372, available from Nalco Chemical, Naperville, IL) and 3.1 ounces (0.09 liters) of antifoam (FOAMASTER TM III, available from Henkel Co., Edison, NJ). After 2-3 minutes, the pH of the mixture was measured to be 5.6. Next, 23 lbs (10.4 kg) of the aluminum sulfate (50% solids) solution was diluted with an equal volume of water and added to the slurry tank with stirring to form a slurry. This paste is given the reference C be...

Embodiment 7

[0154] The settling pressure of the sample of Example 6 above and the sample of Comparative Example 1 below was tested and compared using the Real Condition Fixture Test (RCFT) described above. The temperatures used in the RCFT are representative of the temperatures measured in diesel catalytic converters. Comparative example 1 (C1) is a piece of 4070g / m 2 (nominal) single-layer, low-temperature expanded ceramic fiber sheet containing unexpanded vermiculite, which was purchased from 3M Company, USA under the designation INTERAM. The initial fixed density of embodiment 6 sample and C1 sample is respectively 0.9 and 1.0g / cm 3 .

[0155] The RCFT results of the Example 6 sample and the C1 sample are listed in Table 4 below. The test results show that the multilayer sheet of the present invention can provide higher pressure, ie fixing force, than the sheet of Comparative Example 1 within the indicated temperature range.

[0156] bulk temperature

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Abstract

A multilayer intumescent mat or sheet (30) is useful for mounting a pollution control device (20) or as a firestop. In one aspect, the multilayer intumescent sheet of the invention comprises a non-moldable flexible non-intumescent layer and a non-moldable flexible intumescent layer comprising an intumescent material wherein the layers form a single sheet without the use of auxiliary bonding means. The mat desirably includes a significant proportion of inorganic fiber containing shot, and small proportions of shot-free inorganic fiber and intumescent material. In another aspect, the multilayer intumescent sheet of the invention comprises a first non-moldable intumescent layer comprising a first intumescent material and a second non-moldable intumescent layer comprising a second intumescent material, the first and second intumescent materials being different, wherein the layers form a single sheet without the use of auxiliary bonding means. The invention also provides a pollution control device comprising a multilayer sheet of the invention disposed between a monolith and a housing.

Description

field of invention [0001] The present invention relates to flexible intumescent sheets for use as fire stops or as mounting mats for catalytic converters and diesel particulate filters or traps, and more particularly to the above devices incorporating flexible multilayer inflatable sheets, such sheets The material has at least two layers with different expansion properties. background of the invention [0002] Use pollution control devices on cars to control air pollution. These devices include catalytic converters and diesel particulate filters or traps. Catalytic converters typically contain a ceramic monolithic structure that holds the catalyst. The monolithic structure may also be made of metal. Diesel particulate filters are wall-flow filters with a monolithic honeycomb structure, which are usually made of porous crystalline ceramic materials. [0003] These devices all have a metal (usually stainless steel) housing that houses a monolithic structure made of ceramic...

Claims

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Application Information

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IPC IPC(8): B01D53/88B01D53/94B32B7/02B32B25/02B32B27/04D21H13/38D21H13/46F01N3/021F01N3/28
CPCD21H13/46F01N3/2857B01D53/88D21H13/38B32B25/02F01N3/2864B32B27/04B01D53/94F01N3/0211Y02T10/20Y02T10/12
Inventor R·L·兰格S·M·萨诺克柯G·F·豪沃思
Owner 3M CO
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