Completely biodegradable polylactic acid fiber non-woven fabric filtering material

Abstract

The invention discloses a completely biodegradable polylactic acid fiber non-woven fabric filtering material. The filtering material consists of a polylactic acid fiber composite fiber net and a rigid finishing coating, wherein the composite fiber net consists of an upper-layer polylactic acid short fiber net and a lower-layer polylactic acid short fiber net with different linear density respectively, and the rigid finishing coating liquid comprises the following raw materials by mass percent: 10-20% of a rigid finishing agent, 8-15% of a water-proofing agent and 65-82% of water. A preparation method of the filtering material comprises the steps of firstly, enabling the polylactic acid short fiber to pass through two sets of cotton carding systems which are independent of each other to form the upper-layer composite fiber net and the lower-layer composite fiber respectively, wherein the upper-layer composite fiber net and the lower-layer composite fiber are independent of each other; secondly, feeding the two layers of the fiber nets into a high-pressure forward flow zone and reinforcing to form into a whole; and finally, rigidly finishing, drying, and winding. The filtering material can form the surface filtering mechanism with a density gradient structure, has the characteristics of being bacteriostatic, deodorant, good in efficiency, low in resistance, high in clogging capacity and easy to clean, and can be completely biodegraded after being abandoned.

Description

technical field [0001] The invention relates to a polylactic acid fiber non-woven fabric filter material, in particular to a completely biodegradable non-woven fabric filter material made of 100% polylactic acid short fibers. Background technique [0002] With the continuous improvement of people's living standards, higher requirements are put forward for the cleanliness of the air environment on which they live, so the demand for air filter materials continues to increase. According to the statistics of INDA, the world non-woven fabric industry association, the global consumption of industrial filter materials in 2007 was 1.08735 million tons, with an output value of 643 million US dollars. By 2012, the growth rate reached 14%, which was 754 million US dollars. The main product is industrial dust removal. Bag dust collectors, cartridge filters, air filters, high efficiency filters (HEPA / ULPA), disposable masks and automotive air conditioning filters, of which transportation...

AI Technical Summary

Problems solved by technology

[0003] The existing short-fiber non-woven fabric filter materials are mainly polyester fiber needle-punched non-woven fabrics. The polyester fiber is derived from petroleum-based raw materials, and there are problems of high dependence on petroleum and non-degradability. Since the air filter is a one-time use product , cannot be degraded after being used and discarded, and its volume is relatively large. Landfill or incineration cannot completely solve the discarded filters, which brings difficulties to subsequent waste treatment. These discarded filters are disposable consumables. Such a large amount Waste has brought a huge burden to our living environment, so the development of a fully biodegradable filter material is very important for the sustainable development of society and the protection of the environment we depend on

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