CS238450B1 - Organic pigments concentrates for polyolefin products mass dyeing - Google Patents

Abstract

The invention relates to organic concentrates pigments for coloring polyolefin products in matter. Concentrates consist of organic pigments, polypropylene an alkylpolyglycol ether-based carrier and dispersant. The invention can be used for dyeing polyethylene or polypropylene fibers, films, tubes or other products in matter.

Description

The invention relates to concentrates of organic pigments for dyeing polyolefin products in the mass. The concentrates consist of organic pigments, a polypropylene carrier and an alkyl polyglycol ether dispersant. The invention can be used for dyeing polyethylene or polypropylene fibers, films, tubes or other articles in a mass.

The invention relates to concentrates of organic pigments for dyeing polyolefin products in the mass. The concentrates comprise isotactic polypropylene, an organic or inorganic pigment and the addition of a non-ionic surfactant, optionally with excipients.

The dyeing of synthetic polymers, especially those that do not occupy reactive groups, such as polyolefins, is generally done by physical modification - by dyeing in the mass. Pigments which are insoluble in the dyed polymer and which need to be uniformly dispersed in the melt-spun polyolefin are used for this process. Color concentrates in which the pigment is already sufficiently dispersed are preferably used as the actual dye means for the preparation of particularly demanding articles such as fibers. The advantage of this method is that the actual dispersion of the pigment in the polymer melt can be made separately under optimum conditions from the point of view of the dispersion process, which no longer permits the conditions of processing the synthetic polymer to the same product.

Increasing the color yield of concentrates in polypropylene is solved by the invention of the Czech Republic. AO No. 195 089 and MS. AO Nos. 220 955, 220 957 and 235 399 which protect the dispersants of a mixture of polyoxyethylene glycols, glycerine and alkylene oxide esters with higher fatty acids, ethylene glycol copolymers, higher fatty acids esters of glycerin and alkylene oxide and their ethylene oxide copolymers and their propylene esters acids. Pigment concentrates are also known in which low molecular weight polyolefins of the CS are used as carriers. pat. 147,922, or combinations of low molecular weight polyolefins with alkylpolyethoxamines (U.S. Pat. No. AO 219 552) and other nonionic and ionic surfactants.

We have found that a similar or even higher degree of dispersion of pigments in the melt of isotactic polypropylene as carrier polymer in color concentrates is achieved according to the present invention by adding 0.5-15% by weight of the mixture of isotactic polypropylene and organic pigment. alkyl polyglycol ether of the general formula

R = O- (C 2 H 4 O) _n -OH, where

R forms an alkyl having a chain of C 6 to C 20 and r is in the range of 8 to 25. coloring agent.

The advantage of the concentrates of the present invention is to achieve a high dispersion of the pigment or mixture of pigments, and moreover an antistatic effect of the alkyl polyglycol ether on the final products with the application of these concentrates. Also advantageous are the technical availability and good thermal stability of the alkyl polyglycol ether, such as. as well as the oxidative stability of the concentrates and finished products prepared using such concentrates.

Example 1

A mixture of powdered isotactic polypropylene of rel. mol. weight 110,000, 15 wt. % of pigment Pigment Yellow 95 and 7 wt. of alkyl polyglycol ether of formula C18H37- (OC2H2O-OH) by stirring for 7 minutes. the strings, and after cooling, cut into granules.

For comparison, a color concentrate without the addition of an alkyl glycol ether is prepared under similar conditions.

Fibers dyed in the mass with both concentrates containing 1 wt. in the thread. The dyeing density of the fibers dyed with a concentrate with the addition of an alkyl glycol ether, evaluated as relative color strength by means of a remission spectrophotometer, is 38% higher.

Example 2

Under the conditions of Example 1, a concentrate having the following composition is used to prepare colored fibers:

% wt. Pigment Red 177

3.5 wt. alkyl glycol ether C9H19- (OC2H4) 12OH

0.2 wt. antioxidant-4 (2,6-di-tert-butyl-p-cresol)

91.3 wt. isotactic polypropylene.

To compare the effect, a concentrate without addition of an alkyl glycol ether is also used to prepare the colored fibers.

Color saturation of the fibers containing 0,5 pens. wt. The pigment in the fiber mass is evaluated as a relative staining force with a remix spectrophotometer for concentrate-dyed fibers with an addition of alkyl glycol ether and 75% higher than for a fiber dyed with a concentrate without the addition of an alkyl glycol ether. The distribution of the concentrate in the mass of the dyed fiber, as monitored by light microscopy, is significantly better in the concentrate with the addition of alkyl glycol ether than in the concentrate without the addition of this additive.

Example 3

Under the conditions of Example 1, fibers dyed in a concentrator mass containing:

% wt. 144 wt. alkyl glycol ether C 18 H 37 - (OC 2 H 4) 2 OH

0.2 wt. 2,6-di-t-butyl-p-cresol

78.8 wt. isotactic polypropylene.

For comparison, a concentrate is also prepared without the addition of an alkyl glycol ether. The dyeing density, evaluated as relative dyeing force, is 11% higher for the fibers of the dyed concentrator with the addition of an alkyl glycol ether.

Example 4

The procedure and composition of the concentrate is similar to that of Example 3 except that 0.3% by weight of antioxidant is used instead of 2,6-di-tert-butyl-p-cresol. 2-tert-butyl-4-kumylfenolu.

The color saturation is 12% higher when the concentrate is used with an alkyl glycol ether.

Claims (2)

SUBJECT Concentrates of organic pigments for the coloring of polyolefin products in the mass, consisting of 40 to 99% by weight. % polypropylene, 0.5 to 30 wt. % of pigment or mixtures of pigments, characterized in that they contain 0.1 to 30 wt. alkyl polyglycol ether of general formula Y N O I, E Z U R = O- (C, H10) _n H, where R is C 6 -C 20 alkyl and n ranges from 6 to 70.