High temperature resistant low biopersistence composite fiber felt and its preparation process

Abstract

The invention provides a high-temperature-resistant and low-bio-persistence composite fiber felt and a preparation technique thereof, belongs to the technical field of automotive exhaust treatment, and solves the technical problems that, for instance, existing heat-insulating materials cannot ensure optimal reaction temperature for three-way catalysis. The high-temperature-resistant and low-bio-persistence composite fiber felt comprises high-silica fibers and magnesia-calcia fibers interwoven at a ratio of 1:1; the high-silica fibers reach 1-3 mu m in diameter and 95-105 mm in length, and themagnesia-calcia fibers reach 3-4 mu m in diameter and 15-20 mm in length. The preparation technique of the high-temperature-resistant and low-bio-persistence composite fiber felt comprises the steps of a, preparing materials; b, calcining; c, rotating; d, producing composite fibers; e, knitting. The composite fiber felt prepared herein has the advantage of good insulation from high temperature.

Description

technical field [0001] The invention belongs to the technical field of automobile tail gas treatment, and relates to a high-temperature-resistant and low-biological-persistence composite fiber felt, and also relates to a preparation process for a high-temperature-resistant and low-biological-persistence composite fiber felt. Background technique [0002] As a mobile tool in human activities, automobiles have entered people's daily lives for hundreds of years. Fuel vehicles are mainly diesel, gasoline or bio-fuel. With the increasingly stringent environmental protection requirements, the vehicle exhaust emission limit standards are becoming more and more stringent. In this way, the three-way catalysis of the automobile exhaust system and the working efficiency of GPF / DPF must be improved, and the high temperature environment can significantly improve the three-way catalysis reaction efficiency and improve the particle combustion efficiency in GPF / DPF. Finally, the toxic and ...

AI Technical Summary

Problems solved by technology

All of them have far exceeded the limit service temperature of glass fiber felt. When glass fiber is used at over-temperature, the fiber structure is damaged and there is almost no heat insulation performance.

[0005] 2. Ceramic fiber felt is used to prevent the loss of exhaust temperature by using its heat insulation performance. However, ceramic fiber has been listed as a carcinogen by EU regulations, and its use is prohibited, especially in daily necessities for human beings. China currently has no Regulatory restrictions

In the vibration environment of the car, these excessive slag ball particles will form accumulations, which will make the material distribution of the fiber mat uneven in all directions, and the thermal insulation effect will be greatly reduced

[0006] 3. High silica fiber is used to prevent the loss of exhaust temperature by using its heat insulation performance. However, the high silica fiber is expensive because its silica content is greater than 95%, and more than 95% of its raw materials are from Europe.