CS195089B1 - Dye concentrates for mass-dyeing polyolefin articles - Google Patents

Description

The invention relates to color concentrates for coloring in the mass of fibers, foils, lines, tubes and similar polyolefin shaped articles.

Color concentrate with higher pigment content, usually above 10% by weight. is mixed in the form of granules or crumb with natural polymer in proportion to the saturation and color shade requirements of the product. Such a concentrate is processed, e.g. on screw extruders, on the desired product.

In particular, color concentrates require a high degree of pigment dispersion, especially in the case of fiber and film production. A method for injection dyeing of polyolefins and other polymers is known in which color dispersions consisting of pigment and polyglycol are used. pat. 131 505 or pigment, polyglycol and phosphite - čs. pat. 142 081 or phosphite alone - # 8. pat. 142 079, or the pigment itself with oil - MS. pat. The disadvantage of these concentrates is the complex process of preparing dispersions, storing them and, in particular, feeding them into the polymer melt. The concentrates may be added to the base polymer in various ways, either to the melt in the form of a melt or to the granulate in the form of a granular concentrate. Coloring to the desired shade is achieved by mixing the base shade concentrates.

A high degree of pigment dispersion in the concentrates is achieved by treating the batch on kneading equipment due to shear forces. The larger these are, the higher the degree of dispersion should be. Shear stress is a function of polymer viscosity. The higher the s-goat of goat, the shorter the shear forces. However, at high viscosities, the pigment is not enveloped by the dispersing medium and the spreading effect is reduced by agglomeration and re-compression of the pigment particles. If a crystalline polymer is used as the dispersant medium, agglomeration also occurs when the concentrate is cooled, since the pigment particles are extruded into amorphous non-crystalline polymer portions during crystallization.

These drawbacks are reduced or even eliminated by the addition of amorphous polymers, preferably those whose properties have an antistatic effect. Such a system is the subject of MS. No. 142,083, in which polyglycols with rel. a molecular weight of from 300 to 50,000; also with the addition of phosphitic antioxidants.

The present invention relates to color concentrates for coloring polyolefin products in the mass, which consist of 30 to 90 wt. % polyolefin, 0.5 to 25 wt. of a pigment, optionally a stabilizer and 0.5 to 25 wt. mixtures of polyglycols with a relative molecular weight difference in the range of 300 to 50,000, the value of the difference in rel. mol. wt. the polyglycols used is at least twice the rel. mol. weight of polyglycol used with lower rel. mol. weight.

The invention is based on the implementation of MS. pat.

142 083, in which they found that the effect of the polyglycols used would be enhanced when mixtures of polyglycols with a larger difference in rel. mol. weight. When using a mixture of low molecular weight liquid polyglycols with high molecular weight solid polyglycols, they have the advantage of wetting the mixture in the manufacture of concentrates from powder components and facilitating dispersion and stability of the dispersion and further reducing the risk of explosion during preparation.

To prevent degradation! Polymer and additives, it is preferred to use antioxidants and stabilizers which provide high filterability of color dispersions, stabilizers which do not tend to hydrolyse, such as simple phenolic antioxidants, are used,

Suitable polyglycols are, in particular, polyalkylene glycols and / or copolymers of ethylene glycol and propylene glycol with rel. mol. weighing from 400 to 25,000, as disclosed in U.S. Pat. pat. 142 083.

Example 1

Samples of various concentrates were prepared as follows: Powdered isotactic polypropylene rel. mol. 100,000. stabilized and polyethylene glycol added in amounts and rel. mol. weight in the table, the mixture was stirred for 2 minutes. Then 10 X wt. of phthalocyanine pigment to the weight of the blends and again blended for 2 minutes, kneaded on a twin-spindle kneading apparatus with the evacuation of gaseous fumes and granulated.

The prepared granulate types were evaluated by filtering and assessing the di-sperging of the pigment from the granulate of the prepared fibers under a microscope. The filterability was determined by passing a 1: 3 melt of the concentrate diluted with base polypropylene through a sewn with a filtration level of 45 microns using a metering pump, and the pressure increase on the filter was monitored until a filter pressure of 10 MPa was reached. The filterability was expressed by pressure in MPa per kg of pigment.

table

In the number field Disperser-1 Polyethylene glycol lei. mol. imotnost Conc. dispersant in Z Filterability in MPa.kg ^-1 1. 600 1 0 818 Second 6 000 10 704 Third 20 000 it 500 4th 600 5 453 6 000 5 5th 600 5 386 20 000 5 6th 6 000 6 203 20 000 4 Example ) 2 centering polyethylene glycols was in all- 4 4 wt. The impact of the provided the samples of concentrates according to bilizator on filterability is stated of example no. 1 but they joined the shaft in the table different quantities various stabilizers. A horse

table

sample Dispergátor- Rel. mo 1. stabilizer Conc. Filtrová- number polyethylene glycol weight X Telescope in MPa.kg ' '7. 600 2,6-di-tertbutyl p-cresol 0.2 313 8th 600 styrenizovaný triphenylphosphite 2.0 664 9th 6 000 2,6-di-tertbutyl p-cresol 0.2 126 10th 6 000 styrenizovaný triphenylphosphite 2.0 905 11th 20 000 2,6-di-tert-butyl-β-cresol 0.2 210 12th 20 000 styrenizovaný triphenylphosphite 2.0 915

Styrenized triphenyl phosphite is a type of hydrolyzable stabilizer, not most suitable for stabilizing the concentrates of the present invention.

Example · 3

Isotactic polypropylene powder with rel. mol. wt. 100,000 are poured into the mixer and the following ingredients are added: 0.2 X wt. calcium stearate, 0.2 X wt. 2,6-di-tert-butyl-β-cresol as a stabilizer and 10 ZH. polyethylene glycol with rel. mol. wt. 6000 and 10 wt. polypropylene glycol with rel. mol. weight 20 000 as well as 15 wt. pigment

Cromophtalgelb GR. The mixture was mixed, rotting and granulated. The filterability was 210 MPa.kg -1 and good dispersibility. Example 4

Polyethylene powder with rel. mol. wt. 90,000 is mixed for 5 minutes in a fluidized bed mixer with * 10 wt. copolymer

With ethylene-propylene glycol with rel. mol. wt.

000 and 5 7 ₀ wt. polypropylene glycol with rel. mol. The mixture was granulated in a granulator and the prepared granulate was mixed with granulated colorless polyethylene in a weight of 6000. ratio 1:20 and the mixture was processed to a film. Reachability of 215 kPa was achieved. kg and excellent dispersibility of the pigment throughout the film.

SUBJECT V

Claims (1)

SUBJECT V Color concentrates for the coloring of polyolefin products in the mass, consisting of 30 to 99% w / w 0.5 to 25 wt. % of a pigment, optionally a stabilizer, characterized in that they contain 0.5 to 25% by weight of a pigment; mixing polyglycols with different rel. Y N E L U mol. by weight in the range of 300 to 50,000, the difference value rel. mol. the weight of the glycols used is at least twice the rel. mol. weight of polyglycol used with lower rel. mol. weight. Sevrrografia. n. „Race 7. Most