Method for preparing differentiated meta-aramid for filtering tiny dust
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A differentiated, dusty technology that can be used in wet spinning, single-component polyester rayon, filament/thread forming, etc., and can solve problems such as
Active Publication Date: 2016-03-09
YANTAI TAYHO ADVANCED MATERIALS CO LTD
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[0005] At present, there is no other disclosed technology and method for the productio...
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Embodiment 1
[0017] Dissolve m-phenylenediamine in DMAc, add a certain amount of isophthaloyl chloride to react, and then remove the HCl generated by the reaction, and control the dynamic viscosity of the spinning solution to 520p, and defoam for later use;
[0018] Extrude the prepared stock solution through a triangular special-shaped spinneret at a temperature of 25°C and contain 0.01% CaCl 2 , 56% DMAc aqueous solution in a coagulation bath for forming, and washing, drying, heat treatment, crimping, cutting to obtain differentiated meta-aramid staple fibers with a certain fineness range.
[0019] The triangular special-shaped spinneret has different pore diameters. There are 4 different pore sizes in total, and the pore size distribution gradually becomes larger from the inside to the outside; and the ratio of the number of holes from large to small is: 1:1:1.2:1.3.
Embodiment 2
[0021] Dissolve m-phenylenediamine in DMAc, add a certain amount of isophthaloyl chloride to react, then remove the HCl generated by the reaction, and control the dynamic viscosity of the spinning solution to 600p, and defoam for use;
[0022] Extrude the prepared stock solution through a triangular special-shaped spinneret, the entry temperature is 30°C, and contains 0.04% CaCl 2 , 65% DMAc aqueous solution in coagulation bath molding, and washing, drying, heat treatment, crimping, cutting, to obtain differential meta-aramid staple fibers with a certain fineness range.
[0023] The triangular special-shaped spinneret has different pore diameters. There are 5 different pore sizes in total, and the pore size distribution gradually becomes larger from the inside to the outside; and the ratio of the number of holes from large to small is: 1:1.1:1.2:1.3:1.4.
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Abstract
The invention relates to a method for preparing differentiated meta-aramid for filtering tiny dust. The method is characterized by comprising the steps of a, making m-phenylenediamine react with m-phthaloyl chloride to prepare an m-phthaloyl m-phenylenediamine spinning solution; b, extruding the stock solution through a spinneret plate for rapid forming in a coagulating bath, and conducting washing, drying, heat treatment, curling and cutting to obtain differentiated meta-aramid staple fiber with certain fineness, wherein a triangular special-shaped hole is formed in the spinneret plate, and the diameter of the hole becomes larger gradually from inside to outside. In this way, the fineness of the obtained fiber is 1-2 D with average fineness being about 1.5 D, and the fiber is distributed in a discrete mode. Compared with existing ordinary meta-aramid fiber for filtration, the fiber has the advantages that the fiber has fine denier, the average pore size of a filter material can be reduced, and the filter precision of filter material fiber can be effectively improved; fiber fineness is distributed in a discrete mode, fiber in different specifications is uniformly proportioned, and the advantages of special-shaped fiber are realized.
Description
technical field [0001] The invention relates to a production technology of differentiated meta-aramid fibers, in particular to a preparation method of differentiated meta-aramid fibers for filtering fine dust. Background technique [0002] The rapid development of industry has brought enormous pressure to the environment, and air pollution has become the top priority. The ensuing problems of smog and PM2.5 pose new challenges to the current dust removal technology. How to solve fine dust Particle emission has become an urgent technical problem in the field of industrial dust removal. [0003] In the industrial field, dust control methods include bag filter and electrostatic filter. At present, the dust removal method that is widely used in China and has better effect is bag filter. At present, there are three main measures to improve the efficiency of bag dust removal and reduce the emission of fine dust particles in industrial waste gas, namely post-treatment of filter mat...
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