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Compositions containing biosoluble inorganic fibers and micaceous binders

a technology of micaceous binders and inorganic fibers, which is applied in the field of compositions, can solve problems such as fragile structure and easy breakag

Inactive Publication Date: 2014-05-29
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention is a device that helps control pollution. It includes a housing and a special element that helps with pollution control. There is also a special material called protective packing material that helps protect the pollution control element from damage and compensates for any differences in expansion between the element and the housing. This material also prevents exhaust gases from damaging the pollution control element.

Problems solved by technology

Consequently, the structure is fragile and susceptible to breakage.

Method used

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  • Compositions containing biosoluble inorganic fibers and micaceous binders
  • Compositions containing biosoluble inorganic fibers and micaceous binders
  • Compositions containing biosoluble inorganic fibers and micaceous binders

Examples

Experimental program
Comparison scheme
Effect test

examples

[0102]The following tests were used to characterize the sheet material included in the examples and comparative examples.

Elevated Temperature Shrinkage

[0103]This test was used to determine the shrinkage of sheet material at temperatures that may be seen in a pollution control device. A sample was cut from a sheet using a square die having dimensions of 4.44 cm by 4.44 cm. The sample was measured in the X-Y plane using a dial caliper gauge to determine the area (Abefore heating), and then placed in a Thermalyne Type 48000 furnace that had been pre-heated to 900° C. The sample was heated for 24 hours, 48 hours, or 72 hours as indicated in the test results. After removal from the furnace, the sample was cooled to room temperature and measured with the caliper gauge to determine the area after heating (Aafter heating). The percent shrinkage (% Shrinkage) was determined as follows.

% Shrinkage=[(Abefore heating−Aafter heating) / Abefore heating}]×100

[0104]The sheet material may expand in th...

example 5

[0119]A sheet material was prepared as in Example 4 except that the expanded vermiculite was Micron Grade Expanded Vermiculite obtained from The Strong Co., Inc., Pine Bluff, Ark., and 1 gram of 0.635 long rayon fibers (available from Minifibers Inc Johnson City, Tenn.) was added to the slurry with the soluble fibers. A graph of the results is shown in FIG. 4. The mount density was 0.95 g / cc. The sample was held at the peak temperature for 2 hours. The first cycle is shown in plot 4, the second cycle is shown in plot 5, and the third cycle is shown in plot 6. The intumescent mat had acceptable shrinkage and pressures above 100 kPa when tested in the RCFT.

example 6

[0120]A multilayered construction was formed from a layer of dry-laid and needle punched sheet made as described in U.S. Pat. No. 5,290,522 (Rogers, et al.) at about 700 grams per square meter and a layer of intumescent sheet of Example 5 at about 2770 grams per square meter. The two layers were placed together, and the construction was tested in the RCFT (real condition fixture test) with the Example 5 layer placed next to the hot side platen and the dry-laid sheet placed next to the cold side platen. When tested for three temperature cycles as described in Example 5 at a mount density of about 0.7 grams per cubic centimeter but with the maximum platen temperature reaching only 500° C. on the hot platen and 200° C. on the cold platen, a minimum pressure of about 75 kilopascals and a maximum pressure of about 220 kilopascals was observed. These results demonstrate the general utility of using layered constructions of the present invention as mounting systems in a variety of applicat...

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Abstract

Compositions that include a mixture of biosoluble inorganic fibers and a micaceous binder are described. The compositions can be prepared free of refractory ceramic fibers that are respirable but durable in a physiological medium. The compositions are typically in the form of a sheet material or a paste and can be used, for example, as a protective packing material around the pollution control element or as an insulating material in the end cone region in a pollution control device. Sheet materials formed from the compositions have an area of a X-Y plane that decrease less than about 6 percent when heated to about 900° C.

Description

FIELD OF THE INVENTION[0001]This invention relates to compositions that can be used, for example, as a fire barrier, as a heat barrier such as an insulating material, or as a protective packing material. More specifically, this invention relates to compositions that include a mixture of biosoluble inorganic fibers and a micaceous binder.BACKGROUND OF THE INVENTION[0002]Pollution control devices are used on motor vehicles to reduce atmospheric pollution. Two types of devices are currently in widespread use: catalytic converters and diesel particulate filters or traps. Catalytic converters contain one or more catalysts, which are typically coated onto a substrate in the form of a monolithic structure. The monolithic structures are typically ceramic, although metal monoliths have been used. The catalyst(s) oxidize carbon monoxide and hydrocarbons, reduce the oxides of nitrogen in exhaust gases, or a combination thereof. Diesel particulate filters or traps typically are in the form of w...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B01D53/34C04B30/02F01N3/021F01N3/28F01N13/14
CPCB01D53/34C04B30/02C04B2111/00612C04B2111/00793C04B2111/28C04B2111/34F01N3/0211F01N3/2853F01N3/2857F01N13/14Y10T29/49826C04B14/202C04B14/46C04B14/4643C04B16/06C04B24/26C04B14/204C04B14/42C04B2103/0072
Inventor HOWORTH, GARY F.
Owner 3M INNOVATIVE PROPERTIES CO
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