CS267779B1 - A method of producing dispersions of powder additives, in particular pigment concentrates in polypropylene with modified flow properties - Google Patents

Abstract

Rieii is prepared by dispersing solid additives in polypropylene with adjusted flow properties for polypropylene additive. The method of the binder in breaking down the high-molecular polypropylene carrier with suitable degradation additives, especially peroxides in the additive dispersing process at low temperatures, namely 1 in the presence of dispersants, anti-oxidants and other additives that improve the properties of the polymer.

Description

EN 267 779 B1 1

The present invention relates to a process for the preparation of dl sperules of solids in polypropylene with modified flow properties.

For additivation, in particular in the mass of more demanding polypropylene products, concentrates are used; CS 142 083, 195 089, 195 090, 220 955, 220 957 and 3, respectively, are prepared separately from their own product, usually carried out in a product-processed manner, under the conditions of optimum yield. These conditions are distinctly different from those of individual products. For the production of concentrates, the optimum low temperatures at which the shear forces of the carrier are required to be dispersed are the highest temperatures required to provide temperatures that provide melt flow properties optimally for the product. The result of good results is the rheological properties of the carrier and which can be close to the theological properties of the polymer being processed. The result is a homogeneous range of concentrates in the base of the polymer. High molecular weight builders are very difficult to digest in lower molecular weight polymers, especially in products such as pulp, where very good flowing melt polymers are required. High molecular weight carriers are the cause of the formation of viscosity inhomogeneities that reduce the production reliability and cause defects in the quaternary properties of the products.

Polypropylene can be removed chemically by melting it down with substances that are easy to dispense! for actively radicals and initiate the disintegration reaction of polypropylene. However, it is known that radical forming agents, respectively. the radicals, which break up with disintegration, contain double bonds, even water-linked ones, such as stabilizers, pigments, and the like. However, it has been believed that the polypropylene degradation process takes place in the presence of fragments, 1 at high concentrations. 20-60 X and at temperatures close to the decay temperature of a series of 1-formers.

SUMMARY OF THE INVENTION The object of the present invention is to provide a process for the preparation of dispersion powders and particulate concentrates in polypropylene with modified flow properties, characterized in that the powder admixture with a high molecular weight polypropylene having a melt flow index of 0.1 to 12 g / 10 min is performed in the presence of polypropylene degradation accelerators. the most inorganic peroxides at concentrations of 0.01 to 1X without or with the addition of dispersants, antioxidants and additives at feed temperatures higher than the decomposition temperature of the degradation accelerators present. The effect of these additives depends on the effect of the admixtures, especially the stabilizers, on the dispersants, possibly on the pigment, which is reflected in the increased need for degradation additives, but has not been shown to alter the color shade. This effect is negligible compared to the influence of the dilapidator and the dilapidation of the pigment,

As radical formers, it is possible to use peroxides, certain azo compounds, phenols, alkali metal stearates and the like.

Due to the different effects of the individual components on the degradation of the polymeric carrier, it is necessary for each type of dispersion to determine the optimum concentration of the accelerator additive in the dependence on the desired flow properties of the concentrates and the optimum temperature to choose from the degradation temperature of the degradation agent. The pigment concentrates of the present invention are particularly suitable for the dyeing of polymers with treated sluggish properties treated at temperatures of 200-260 ° C, especially for the lower weight weight.

Claims (1)

2 CS 267 779 B1 Example 1 18 kg melt powdered polypropylene 2 g / 10 min, determined at a temperature of 230 ° C according to ČSN 64 3050, xa mieSalo in high speed with 2 kg of polypropylene oxide of 1000 and 150 g 2,5 dimethyl-2,5 di (tert-butylproxy / hexane, ie 0.6 X ha). weight of concentrate. After 5 mins of aspiration x and 5 kg of CIPignent Red 177 ligand was added. The ate 1 ainut and potoa xa was kneaded on a two-spindle gun at a zone temperature of 200 ° C, 50 ° C, 50 ° C, 50 ° C, 180 ° C. ° C. In the aftermath of effective rotting, the zaet has been jacketed and the material temperature has gradually increased to 180 ° C. The melt extruded it through the nozzle onto the strings, which were shredded into granules after storage. The concentrate flow index was 22 g / 10 min. Similarly, concentrates with alalSimi pigments were prepared. The melt index of 22 g / 10 min was reached by Pignent Sreen 7 at a peroxide concentration of 0.17% by weight, by Pignent Black 7 by 0.22% by weight, in Pignent Yellow 83 by 0.15% by weight. peroxide. EXAMPLE 2 18 kg of melt flow index polypropylene of 9 g / 10 min x and mixed with 2 kg of glycerine monostrate, 125 g of trilauryltrithiophosphite. After 5 minutes of aspiration, 5 kg of C.I. Pigment Red 144 and after 1 ninute hnietilana blending with a two-stranded kneader at 250 ° C, 240 ° C. 240 [deg.] C., 240 [deg.] C., 250 [deg.] C. The melt extruded through the nozzle onto strings which, after cooling with water, were cut into grains. The granulate flow index was 22 g / 10 nin. EXAMPLE 3 18 kg of a 6 g / 10 min melt flow rate polypropylene powder were blended in a turbo charged with 2 kg of stearylated polypropylene oxide and 0.18 kg of potassium stearate. After 5 minutes of aspiration, 2 kg of C.I. Pignent Red 214 and after a nineteen miechialization on a two-spindle kneader device at temperatures of 260, 250, 250, 250, 250 ° C. The melt was extruded through a nozzle onto strings which, after cooling with water, were chopped into granules. / 10 min. OBJECT OF EXPLOSION Method of manufacturing a long-range powder additive, especially concentrates of pigaents in polypropylene modified by flow properties! characterized in that the high-molecular weight polypropylene powder additives with a melt index of 0.1 to 12 g / 10 min are made with or without the addition of organic peroxides in the presence of substances which accelerate the degradation of polypropylene; dispersers, antioxidants, and other additives at the feed temperatures higher than the decomposition temperature of the degradation accelerating agents present.