Large-size diesel oil particulate filter with low pressure drop and low expansion coefficient and preparation method thereof

Abstract

The invention discloses a large-size diesel oil particulate filter with low pressure drop and a low expansion coefficient and a preparation method thereof. The filter is prepared from the following raw materials: an inorganic component, a graphene precursor, starch, polymer resin and an adhesive, wherein the inorganic component is prepared from the following components by mass: 30 to 50 percent oftalcum, 5 to 30 percent of kaolin, 10 to 25 percent of aluminum oxide, 5 to 30 percent of hydrated alumina and 5 to 25 percent of silicon dioxide; the amounts of the graphene precursor, the starch and the polymer resin respectively account for 2 to 15 percent, 5 to 10 percent and 5 to 15 percent of the mass of the inorganic component; the amount of the adhesive is 2 to 10 percent of the total mass of the inorganic component, the graphene precursor, the starch and the polymer resin. The filter provided by the invention can be used for purifying automobile tail gases, in particular to particulate matters in tail gases of diesel vehicles, so that the problems of high pressure drop and high thermal expansion coefficient in an existing filter are solved; meanwhile, the problem of lower qualification rate in the preparation process of the filter is solved, the production cost is reduced, and the production efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of diesel particulate filters, in particular to a low-pressure-drop, low-expansion coefficient, large-size diesel particulate filter and a preparation method thereof, in particular to a low-pressure-drop, low-expansion coefficient, large-size diesel filter using a graphene precursor A car soot particle trap and a preparation method thereof. Background technique [0002] With the increasingly stringent environmental protection regulations, automobile exhaust, as one of the important ways of air pollution, is also facing great challenges. Diesel particulate filter is used in the exhaust system of diesel vehicles to reduce particulate matter (PM) in the exhaust by filtering. Diesel particulate filter (DPF) has a high filtration efficiency for soot particles, which can reach 60% to 90%. This type of filter is generally designed as a wall-flow structure. The inlet end of the pore is an open pattern, and the out...

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Problems solved by technology

[0006] For this reason, one of the purposes of the present invention is to provide a low-pressure drop, low expansion coefficient, large-size diesel particulate filter, which can be used for automobile exhaust purification, especially for the purification of particulate matter in diesel vehicle exhaust, and solves the high pressure of existing filters. The problem of low and high thermal expansion coefficient, and at the same time solve the problem of low pass rate in the process of preparing the filter, reduce the production cost and improve the production efficiency

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