CS198682B1 - Method of manufacturing polypropylene tow fibres from non-elongated waste material - Google Patents

Description

It is an object of the present invention to provide a process for the production of polypropylene cable fibers or silk from their unencumbered wastes. The present method allows the most efficient use of said wastes.

The occurrence of waste in individual technological nodes results directly from the applied technological process of production of polypropylene cable.

Unloaded and partially burdened waste obtained during spinning and loading has the following disadvantages: a / contains a large amount of moisture of 7 to 20%, b / during regeneration! Polymer from Waste by melting process is obtained polypropylene for salvage processing with an unsuitable high melt index, with an increased aging tendency and with some deteriorated physico-mechanical properties. c) This low-quality polymer cannot therefore be used as a raw material for fiber processing.

The shortcomings that used doterajěích waste polypropylene fibers removed ^ of the process, which opens the possibility of use of the tow Netizen waste and _the waste silk.

This method consists in the following »

0.03 to 0.50% of the stabilizer tetrakis - (2,4-di-tert-butylphenyl) -4,4'-biphenylenediphosphiteite is uniformly added to the waste which is centrifuged and cut.

Optionally, the stabilizer waste may be homogenized in a conical mixer or other suitable device. ~.

Said centrifuged and cut waste without a stabilizer has a melt index of 2.5 to 15 g / 10 min and a humidity of 0.05 to 12%. Said melt indices in this invention are determined at 230 ^G C. The stabilizer waste is further processed to regranulate in the melt screw at temperatures

198 682

170-300 ° C. The regranulate has a melt index of 3 to 15.5 g / 10 min and a humidity of 0.05 to 0.60%. Regranulation may not be repeated.

In addition to the regranulate, an agglomerate can be used which can be prepared by adding or without said stabilizer, in which case the stabilizer can also be used to agglomerate the agglomerate, alone or in admixture and with the regranulate, or with finely chopped fiber waste.

Instead of the regranulate, it is also possible to use finely chopped non-pulverized fiber waste, which can be washed with the cell and the gray regranulate or with the color concentrates and the said stabilizer is added with stirring.

In addition to the re-granulate, finely chopped unreinforced fiber or silk waste may be used in the preparation of polypropylene staple fibers or polypropylene filaments.

The first or second regranulate, the agglomerate and the chopped undigested fiber thus prepared are then homogenized for 8 to 15 minutes in a conical mixer or other suitable apparatus. The regranulate homogenized alone or with the granulate or concentrates used is melted in a melting screw at temperatures of 215 to 360 ° C. It is fiberized at temperatures of 220 to 330 ° C. The melt index determined on the spinneret is 3.5 to 16 g / 10 min. The fiber is then stranded at a speed of 80 to 1000 m / min and a ratio of 1: 2 to 1: 6. The temperature of the galvanizing machine is 60 to 155 ° C. The cable filament obtained has a strength of 1.2 to 3.3 µM / dtex, an elongation at break of 35 to 150%, a total fiber titer of 80 to 8000 dtex, a maximum moisture content of 0.5% and a maximum preparation content of 1.4%. At least the color fastness hurt in the art on light 3rd degree, in dry rubbing 3rd degree, in shampooing 4th degree, in water 4th degree.

The economic advantage of the proposed process is that in the production of polypropylene fibers the waste is used as a separate polymeric raw material, dyed to a final color shade. The polypropylene fiber produced in this way can be classified into quality classes. Other advantages of this method are that javi a / lower milling temperatures b / improved operational reliability of the milling and differs in / on some shades of the waste-treated fibers and gains a slightly better feel compared to conventional fibers

The present invention can be used in the production of polypropylene fibers from non-weighted and partially digested wastes. The invention has been tested under operating conditions and its utilization reaches production rates and quality indicators.

Examples

1. Used undrawn and partially digested wastes from the production of cable fibers. These fibers are produced by spinning polypropylene under the trade mark Tatren TB 451. The produced polypropylene cable contained 0.8% of the fillers under the trade mark Ghromophtal rot% / 0.9800 vh.p./ and Paliogen rot 4790 / 0.0784 vh.p./ '.

Said waste and moisture and other volatile fractions of 11.60% were removed to a humidity of 0.54 to 1.20%, 200 kg of centrifuged waste and evenly dusted with 0.5 kg of said stabilizer. It did not observe remelting at temperatures of 230-250 ° C and a melting time of 2-2.5 min in a 125-mm diameter melting screw. The regranulate was mixed for about 10 min in a conical mixer. The homogenized regranulate was remelted and a second regranulate was obtained in the same remelting process. The second regranulate had a melt index of 7 »86 g / 10 min and a humidity of 0.1%. The granulate was melted at 230 ° C in a melting screw with a screw diameter of 90 mm. It was fiberized at 270 ° C. The melt elsewhere on the spinneret was 9.42 to 9.83 gAO min. The average speed was 270 m / min and the ratio was 1: 3. The temperature of the lower galette was 105 ° C and the upper galette was 125 ° C. The fiber parameters obtained were as follows: strength 1.95 cN / dtex, elongation 70.8%, titet 4069 dtex, maximum titer deviation + 2.23%, number of broken fibrils per 50 m 1.5, 4.36. Color fastness was minimal: in dry abrasion 4th to 5th degree, in shampooing 5th degree, in water 5th degree.

2. Procedure similar to Example 1. The only difference is that the waste was dusted with 0.4 kg of said stabilizer. The parameters obtained are: strength 1.93 cN / dtex, elongation 66.2%, titer 4074 dtex, titre deviation maximum + 1.85%, number of broken fibrils per 50 m 2.5, shrinkage 4.0. The color fastness is at least: at a dry abrasion of 4 to 5 * degree, a shampoo of 5 «degree, in water a 5th degree.

3. Same procedure as in Example 1, except that the waste was dusted with 0.5 kg of the stabilizer. Acquired physico-mechanical properties: strength 2.01 cM / dtex, elongation.66.5%, titer 3997 dtex, titer deviation - 0.06%, number of broken fibrils at 50 m 0.0, shrinkage 4.0. Steady coloring at least: in dry rubbing 4th to 5 * degree, shampooing 5th degree, in water 5th degree.

The achieved indicators under the above conditions in three examples allow the fibers to be classified into the first quality.

Claims (3)

SUBJECT MATTER First Process for the production of polypropylene cable tows or silk from their undetermined wastes, characterized in that tetrakis / 2,4 stabilizer is added to the waste to be removed and cut with 0.1 to 11%, preferably 0.1 to 3% moisture. - di-tert-butylphenyl / -4,4'-biphenylenediophosphonite of the formula t-t-t-t-t in an amount of 0.03 to 0.50%, preferably 0.10 to 0.30% by weight and at a temperature of melt 170 to 300 ° C, preferably 205 to 260 ° C, a granulate is obtained, which is then spun at temperatures of 220 to 330 ° C. 2. Method according to claim 1, characterized in that the regranulate obtained is further processed in the melt screw before spinning. 3. The method according to claim 1 or 2, characterized in that the peeling speed is 80 to 700 m / min, preferably 2 to 350 m / min, and is 1: 2 to 1: 6, preferably 1: 2. 7 to 1: 4, with a lower galet temperature of from 90 to 115 ° C, preferably 105 ° C, with an upper galet temperature of from 10 ° to 135 ° C, preferably 125 ° C. '