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A kind of low temperature expandable gasket and its manufacturing method

An inflatable, cushioned technology, used in machine/engine, mechanical equipment, engine components, etc., to solve problems such as insufficient holding force, shrinkage, prolapse or breakage of the cushion

Active Publication Date: 2019-11-22
HENAN XIXIA KAIYUAN METALLURGICAL MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, it should also be noted that the organic binder in the gasket cannot be fully pyrolyzed, and the residual binder also limits the expansion of the gasket.
In addition, the weight loss caused by the pyrolysis of the organic binder in the liner will instead cause the liner to shrink
The combined effect of these three factors makes the traditional intumescent gasket unable to provide sufficient fixing force in the vehicle exhaust aftertreatment system with low operating temperature
During the operation of the vehicle, the insufficiently fixed ceramic carrier, ceramic filter element, and silicon carbide filter element are prone to slipping, detachment or damage, which will cause the vehicle exhaust after-treatment system to fail, the vehicle exhaust cannot be fully purified, and the emission is not up to standard

Method used

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  • A kind of low temperature expandable gasket and its manufacturing method
  • A kind of low temperature expandable gasket and its manufacturing method
  • A kind of low temperature expandable gasket and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0043] figure 1 A flow chart of the preparation method of the low temperature intumescent gasket is shown. Such as figure 1 As shown, step 1, slurry preparation: Add quantitative polycrystalline mullite fibers with large diameters and amorphous aluminum silicate fibers with small diameters into water, add a dispersant, and prepare a mixture with a certain fiber concentration, preferably 0.01- 2% mixture, apply high-speed stirring to disperse the solids in the slurry to make them evenly distributed, disperse for a certain period of time, and then add defoamers, adhesives, flocculants, surfactants, etc. The expansion material and the filler can be added together with the thick diameter polycrystalline mullite fiber and the fine diameter amorphous aluminum silicate fiber before; they can also be added separately after the slurry is formed. Wherein, the sum of the weight of the thick-diameter mullite fiber and the thin-diameter aluminum silicate fiber accounts for 30% to 95% of ...

Embodiment 1

[0053] After purchasing the fibers, sample 5g of a certain batch of polycrystalline mullite fibers and another batch of amorphous aluminum silicate fibers respectively, and take pictures under an electron microscope. Each fiber can be clearly seen under the electron microscope. Computer-aided calculations yielded the average diameter of the fibers in the batch. For the fibers of the two batches in the present embodiment, the average diameter of the polycrystalline mullite fiber is 8.01 micron, the average diameter of the amorphous aluminum silicate fiber is 2.06 micron, and the shot content of the amorphous aluminum silicate fiber is 3.6%.

[0054] In this implementation, the weight sum of polycrystalline mullite fibers with an average diameter of 8.01 microns and amorphous aluminum silicate fibers with an average diameter of 2.06 microns accounts for 65% of the total weight of the liner, and more than 8.01 microns with an average diameter The crystalline mullite fiber accoun...

Embodiment 2

[0058] For the fibers of the two batches in this embodiment, the average diameter of the polycrystalline mullite fiber is 9.89 microns, the average diameter of the amorphous aluminum silicate fiber is 4.93 microns, and the slag content of the amorphous aluminum silicate fiber is 4.3 %.

[0059] In this implementation, the weight sum of polycrystalline mullite fibers with an average diameter of 9.89 microns and amorphous aluminum silicate fibers with an average diameter of 4.93 microns accounts for 65% of the total weight of the liner, and more than 9.89 microns with an average diameter The crystalline mullite fiber accounts for 1% of the total weight of the fiber, and the remaining 99% is the amorphous aluminum silicate fiber with an average diameter of 4.93 microns. The expansion material is a combination of unexpanded vermiculite and pretreated vermiculite, the weight of the expansion material accounts for 30% of the total weight of the pad, 4% of the easily pyrolyzable orga...

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Abstract

The invention relates to a low-temperature-expansion type liner and a manufacturing method thereof. The low-temperature-expansion type liner and the manufacturing method thereof have the advantages that large-diameter polycrystalline mullite fibers are mixed with small-diameter amorphous aluminum silicate fibers according to a certain proportion, an organic adhesive easy to pyrolyze is used, the use amount of the adhesive is reduced, and the initial expansion temperature of the expansion type liner is lowered to below 300 DEG C; the low-temperature-expansion type liner can be well applied to a vehicle tail gas post-treatment system low in working temperature.

Description

technical field [0001] The invention relates to an intumescent gasket and a manufacturing method thereof, in particular to a low-temperature intumescent gasket and a manufacturing method thereof. Background technique [0002] China's urban air pollution is facing unprecedented challenges, and controlling vehicle exhaust pollution is of great significance to improving the rate of urban air quality compliance. There are two ways to control vehicle exhaust pollutant emissions: one is to control the source of pollutants—the combustion process. At present, this measure can no longer meet the increasingly stringent emission standards; The treatment system purifies exhaust pollutants through chemical reactions. [0003] Vehicle exhaust after-treatment systems can be divided into gasoline vehicle exhaust after-treatment systems and diesel vehicle exhaust after-treatment systems. Regardless of the reaction mechanism of the exhaust gas treatment, the design includes ceramic carriers ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/26C04B28/00F01N3/021F16J15/10C04B14/46C04B14/40
CPCC04B28/001C04B28/26F01N3/0211F16J15/102C04B24/2623C04B14/4656C04B14/40C04B14/202C04B24/2641C04B14/24C04B14/204C04B14/024C04B14/20
Inventor 王志博
Owner HENAN XIXIA KAIYUAN METALLURGICAL MATERIALS CO LTD