CS249233B1 - Stabilized polypropylene especially in form of fibres with improved properties - Google Patents

Description

The above-mentioned additives under operating conditions may be added to the polypropylene powder prior to making the pigment concentrates, and mixing these and other ingredients with the polymer is preferably made in a turbulent mixer. Further, it is possible to prepare the individual concentrates either from the individual additives, preferably in an amount of 20%, or from a mixed mixture of the two additives in polypropylene, preferably powder, when mixed, preferably in a turbulent mixer, then remelting the mixture and then adding it in granulate either prior to mixing and homogenizing the pigment concentrates, or with the aid of a dispenser, either into a secondary extruder or into a base melt aggregate. Optionally, it is possible to add as pure additives before granulating the polymeric feedstock.

The filterability of the concentrate mixture is increased and the fiberized number of broken capillaries, titer variation and elongation at the polypropylene fiber market are reduced in the additive combination with very small amounts of phosphite and phosphonite stabilizers in the pores with the fibers without the addition of these stabilizers. This effect of the above-mentioned mixture of very small amounts of stabilizers is novel. It is based on the effect of these additions to improve the recovery properties and the structural contraction in the polymer even in the presence of the pigment. Another advantage of the above invention appears to be the use of additives in very small amounts, being accessible and non-toxic substances. The phosphite stabilizer is very fast. A further advantage of the above invention is an accessible, simple and economical process using mechanical mixing and melting - conventional processing steps in the preparation of fibers and plastics products.

Example

Mechanical mixing of the 10% additive concentrates listed in Table 1 with 0.07 to 0.12% by weight of the antistatic agent Estosin CE 5,125 calculated on the basis of the concentrate mixture was carried out in a cone mixer for 70 min. The homogenized mixture of concentrates was fed through a dispenser into a co-extruder with a screw diameter of 45 mm, where it was melted and then blended with a melt of polypropylene of the trademark Tatren TE 451 in a basic melt aggregate with a screw diameter of 90 mm. The conditions were melted and spun: the temperature of the filter 280 ^Q C, dispensing the melt on one zvlákňovacle place of 300 g / min, towing speed m / min godet top 461 and bottom 459 of the winding machine NSF-4; total titre of undrawn fiber 6 580 dtex. Further conditions of the melt-spinning process are given in Table 2. The unstretched fiber was stretched and shaped on a "Pneutex" air-conditioning machine under the conditions: ratio - owing 3, relaxation 0.75; speed of the pallets in m / min - start-up 500, lengthening 1 500, draw-off 1124; a lead-in temperature of I 125 ° C and II 120 ° C, incremental galleys 134 ° C, shaping air in the chamber 150 ° C; total titer 2,670 dtex. The spinning of the fiber on the "Verdol" machine was carried out under normal conditions. The determination of individual indicators was carried out according to standards. The efficacy of the combined very small amounts of phosphite and phosphonite stabilizers (Assay for Filterability of the Concentrate Mixture (Table 1) and Fiber Properties (Table 3) was monitored). Compounds A were compared to values of tests 0 and 01 which did not contain the above stabilizer mixtures.In the presence of a combination of very small amounts of phosphite and phosphonite stabilizers (Test A), increased filterability of the concentrate mixture (Table 1) was observed and reduced - pulping, number broken capillaries, titer variation, and market elongation (Table 3) compared to Test 0 in the absence of this combination of stabilizers, but in the presence of a combination of very small amounts of the phosphite and phosphonite stabilizers (Test A), a reduced melt index was observed despite the elevated temperature in the base melt aggregate and distribution branches, indicating an even higher thermal stability compared to the O-test (Table 2). Thus, the presence in polypropylene by combining very small amounts of phosphite and phosphonite stabilizer, and improves the filterability of the pigment concentrate mixture and the properties of the polypropylene fibers. This effect of combining very small amounts of the above stabilizers into polypropylene fibers prepared from conventional raw materials is novel.

The use of the aforementioned invention is particularly suitable for lightly degradable color shades during the melt spinning process. Optionally, it is possible to improve the abrasion and increase the operational reliability. It is possible to achieve the desired improvement in the properties and processability of polypropylene fibers prepared from polymer systems with a deteriorated prehistory such as wastes by adding the above additives. The aforementioned invention is of application importance for improving the properties of polypropylene in this number of its fibers and plastics products from conventional raw materials, various types and forms of waste, as well as mixtures of wastes with conventional raw materials. The invention is tested under operating conditions.

Table 1 Contents allowances for finite fiber base,% An exam tris [2,4-bis (1‘-) phosphonite Cromophtal pretiox together filterability -phenylethyl) -fe- stabilizer gelb GR RD-53 Both in g. MPa ^-1 ny! jfosfit pigments for a mixture of concentrates

A 0 01 0.0414 0.0724 0.0212 0.0844 0.0217 0.1527 0.0120 0.0934 0.1056 .1744 .1054 178.30 167.79 143.60 Table 2 An exam dinyl pair at Temperature in ° C Melting index the basic rozvod- tubes between the secondary extruder at 230 ° C, nom NYCHA and in zones g / 10 min meltdown branches basic aggregate aggregate I II III A 318 300 to 304 215 240 215 215 8.08 0 310 285 230 255 230 230 8.83 Table 3 An exam The final thread rozvláknenosť titer variation tear strength elongation at rupture % % cN / dtex market capillary % 50 m A 2.75 +0.58 1.88 50.9 1.7 0 5.52 +1.16 1.86 55.5 2.3

Claims (1)

Stabilized polypropylene, in particular in the form of fibers with improved properties such as pulping, capillary breakage, titer variation and elongation, INVENTION that, relative to the polypropylene, it contains 0.01 to 0.2, preferably 0.02 to 0.15% by weight of tris [2,4-thi'Si (1'-phenyiletes, 1phenyl) phosphite of the formula and 0.03 to 0% 3, preferably 0.04 to 0.25% by weight of tetrakis (2,4-di-tert-butylphenyl)