Polylactic acid filament yarn non-woven filter material and application thereof

Abstract

The invention discloses a polylactic acid filament yarn non-woven filter material and application thereof. Most of the existing air filtration materials adopt non-renewable materials, thus bringing difficulty in follow-up waste treatment. The filter material comprises 100% polylactic acid filament yarn fiber net, and is prepared by the following steps of firstly thoroughly drying pre-crystallized polylactic acid slices; then melting and squeezing by more than two groups of spinning machines, cooling, drafting and separating yarns so as to form nets respectively, and overlaying to form a composite fiber net; finally, rolling the composite fiber net into a whole by a hot mill. The filter material has a surface filtration effect, has the characteristics of high filtration efficiency, large clogging capacity, low resistance, good air permeability, low ash removal frequency, antibacterial performance and deodorization, and can be completely degraded after being discarded.

Description

technical field [0001] The invention relates to the field of non-woven filter materials, in particular to a polylactic acid filament non-woven filter material made of 100% polylactic acid filament fibers and its application. Background technique [0002] With the acceleration of the world's industrialization process, serious environmental pollution problems follow. The dust emitted by industrial and agricultural production, transportation, etc. is particularly prominent in air pollution, so the demand for air filter materials continues to increase. According to the statistics of INDA, the world's non-woven fabric industry association, the global consumption of industrial filtration materials in 2007 was 1.08735 million tons, with an output value of 643 million U.S. dollars. By 2012, the growth rate will reach 14%, which is 754 million U.S. dollars. The main product is industrial dust removal. With bag filters, cartridge filters, air filters, high efficiency filters (HEPA / ULP...

AI Technical Summary

Problems solved by technology

[0003] Existing air filter material mainly contains two classes, and a class is the filter paper that is made of wood pulp fiber, is the largest consumption on the market at present, the product with the widest application field, yet adopts filter paper as the filter element of filter and there is following problem: One One is that filter paper uses wood pulp as raw material, which inevitably consumes a lot of forest resources, and is a resource-consuming product; the other is that the production process of filter paper is long, and the papermaking wastewater generated due to the use of a large amount of adhesives and chemical additives in the papermaking process The third is that when the filter element made of filter paper is used in rainy or humid weather, the cellulose fiber is very easy to absorb water after being damp, which causes the fiber to swell, and the pressure difference of the paper filter element increases rapidly. , which ultimately affects the filtration and performance of the filter element; the fourth is that with the increase of use time, the paper filter element is particularly prone to aging and becoming brittle, which greatly reduces the service life of the filter element

[0004] The other is non-woven fabric made of synthetic fiber polyester as air filter material. Polyester fiber non-woven fabric relies on petroleum base as raw material, which has the problem of high dependence on petroleum and non-degradability. Since air filter is a one-time use product , cannot be degraded after use and discarded, and its volume is relatively large. Landfill or incineration cannot completely solve the discarded filter, which brings difficulties to subsequent waste treatment. With the increasing energy consumption of industrialization and the increase in the number of automobiles, the annual The average consumption of filter materials has exceeded one million tons. These disposable consumables have brought a huge burden to our living environment after being discarded. Therefore, it is necessary to develop a healthy and environmentally friendly filter material that is completely degradable.

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