CS245098B1 - A method of surface treatment of pigments for coloring polyolefins in the mass - Google Patents

Abstract

The solution relates to the surface treatment of pigments for dyeing polyolefins in bulk. The surface treatment of pigments for dyeing polyolefins in bulk according to the solution consists in that the pigment is homogenized after grinding in an aqueous medium with polyoxypropylene glycol or a water-insoluble copolymer of ethylene oxide and propylene oxide with a molecular weight of 600 to 10,000. In addition, derivatives of polypropylene oxide and a copolymer of ethylene oxide and propylene oxide with higher alcohols and carboxylic acids can also be used for the surface treatment. Powdered polyolefin can also be added to the mixture. After homogenization, the pigment is separated and dried.

Description

The invention relates to the surface treatment of pigments for coloring polyolefins in a mass.

The color yield of pigments used for coloring polyolefins in the mass is a function of their quality, in particular the ability to disperse to a high degree in the polymer melt. A high degree of pigment dispersion in polyolefins can be obtained by adding suitable dispersants (AO 195 089, AO 220 955, AO 220 957). These substances often also influence other properties of the polymer melt, such as reducing electrostatic charge, improving rheological properties and processability. However, even with the use of dispersants, the optimum degree of pigment dispersion is not achieved when using commercial dispersing devices.

The maximum or optimal degree of dispersion of organic pigments for coloring polyolefins in the mass can only be achieved by special grinding procedures in liquids with a viscosity of about 1 Pas (US Pat. 126 136, US Pat. 3,755,244). The principle of these processes consists in grinding the pigments in an aqueous medium with or without the presence of polyolefins and with the addition of a special dispersant dissolved in water depending on the pH (organic) phase which precipitates after grinding together with the pigment.

The present invention relates to a process for the surface treatment of polyolefin coloring pigments in a mass, characterized in that the pigment, after grinding in aqueous medium, is homogenized with polyoxypropylene glycol or a water-insoluble copolymer of ethylene oxide and propylene oxide of molecular weight 600-10,000 or ethers thereof. with higher alcohols or with carboxylic acid esters having a carbon number of C8 to C20, or mixtures thereof, in the presence or absence of polyolefins at a temperature of 20 to 100 DEG C. and after separation, the treated pigment is dried. Cooling the dispersion or adding cold water to the dispersion produces a dispersible dispersion consistency.

Ionogenic or non-ionic substances are used as surfactants in the milling of the pigment, e.g. polyoxyethylene glycols and their water-soluble derivatives in a concentration of up to 30% by weight; The pigment concentration for aqueous grinding is 4 to 40% by weight.

The organic dispersant based on the water-insoluble derivatives of p-olyloxyalkylene glycols, copolymers-ethylene oxide and propylene oxide or mixtures thereof is added in an amount of 20-150% by weight in the surface treatment. % to pigment, preferably 30-50 wt. for pigment.

The β-superficial pigment is further used for the preparation of concentrated phosphate dispersions or for direct dyeing of polyolefins in the mass.

Advantages of said process for the preparation of surface-treated pigments include the formation of pigment particles in the diameter of less than 0.1 mm with a significant reduction in dustiness, a high degree of pigment pre-dispersibility with subsequent increase in its coloring strength by 20-30 ° / o. dispersible types, and good miscibility and homogenization with the base powder polymer, respectively. in a polymer melt.

The examples below illustrate the subject matter of the invention.

Example 1

100 parts by weight Pigment yellow 95 in the form of a filter cake containing 20 parts pure pigment and 80 parts water is diluted in a planetary mixer with an additional 100 parts water containing 20 wt. poly-o-xyethylene glycol 600 and 6,000 in a 1: 1 ratio. After homogenization, the dispersion is ground in a continuously operating bead mill at 2000 rpm and 70 ° C with a 5-fold passage. The dispersion is then transferred to a high-speed h-omogenizer and 8 parts of a 1: 4 ethylene oxide / propylene oxide copolymer with a molecular weight of 3,000 are added and the mixture is then homogenized for 10 minutes. 100 parts of cold water are added at the end. The surface-treated pigment particles are formed in the dispersion. These are filtered off, washed with water and dried at 60 ° C to constant weight.

Example 2 parts by weight. Pigment Red 147 was mixed with 180 parts water containing 20 ^ιθ / ο weight. polyoxyethylene glycol 600 ester and oleic acid. After homogenization, the dispersion is ground in a continuous bead mill for 4 hours. After this time, the dispersion is transferred to a high speed homogenizer. 100 parts of polypropylene ether-octyl alcohol having a molecular weight of 2500 are added to the dispersion. The dispersion is homogenized at 2,000 rpm at 50 ° C and then cooled by adding an additional 100 parts of cold water. The resulting coated dispersion was filtered off, washed with water and dried at 60 ° C.

Example 3

To 50 parts of polyethylene powder are added 20 parts of a 1: 5 o-molecular weight ethylene oxide / propylene oxide copolymer of 2,000 weight and the mixture is homogenized on a rapid mixer at normal temperature. 500 parts of water and 100 parts of yellow 145 ground pigment filter cake containing 50% water are then added to the mixture. The mixture was again homogenized on a rapid mixer for 10 minutes. Then add another 45 45 8

150 parts water, the treated pigment is filtered off and dried at 70 ° C under vacuum.

Example 4

To 50 parts of powdered polyethylene was added 30 parts of polyoxypropylene glycol having a molecular weight of 2,500 and the mixture was homogenized on a mixer for 5 minutes. To the mixture was added 100 parts of a black 7 pigment filter cake containing · 50 why. water and 500 parts water. The mixture is again homogenized for 15 min. at 40 ^° C in a quencher and after addition of another 200 parts of cold water, the treated pigment is filtered and dried under vacuum at 70 ° C. Example 5

To 50 parts degraded polypropylene powder with a flow index of 150 g / 10 min. 20 parts of a 1: 4 mixture of ethylene oxide and propylene oxide 1: 4 having a molecular weight of 4,500 and an oleic acid ester of polyoxyethylene glycol 600 are added and homogenized at 60 ° C. Add 100 parts of the red 147 pigment cake containing 50% water and add 400 parts of water. The whole mixture is homogenized on a stirrer for 10 minutes. After adding 200 parts of cold water, the treated pigment is centrifuged and dried.

Example 6

To 50 parts of polypropylene powder is added 30 parts of a 1: 4 ethylene oxide / propylene oxide copolymer of 3,500 molecular weight of 3,500 and the mixture is homogenized on a mixer at normal temperature for 5 minutes. To this was added 100 parts of a yellow 145 pigment cake containing 40% water and the mixture was again homogenized for 15 min. on a rapid mixer and dried at 70 ° C under vacuum.

The increase in dyeing strength (RFS) of the concentrates prepared from the treated pigments over the concentrates produced by conventional methods, determined by measuring the remission of the fibers produced from said concentrates.

RFS concentrates of treated pigment versus conventional

Concentrate number from the same pigment examples

First 135 % Second 125 % Third 106 % 4th 131 % 5th 128 % 6th 132 %

SUBJECT

Claims (1)

150 parts of water, the treated pigment is filtered off and dried at 70 ° C under vacuum. Example 4 To 50 parts of polyethylene powder, 30 parts of polyoxypropylene glycol are added to a molecular weight of 2,500 and the mixture is homogenized on a high speed mixer for 5 minutes. To the mixture is added 100 parts of a filter cake of black 7 pigment containing 50%. water and 500 parts water. The mixture was homogenized again for 15 min. when warming 40 cc with a quick mixer and adding 200 more parts of cold water, the treated pigment is filtered and dried under vacuum at 70 ° C. Example 5 K 50 parts of degraded polypropylene with a flow rate of 150 g / 10 min. 20 parts of a 1: 1 mixture of copolymer ethylene oxide and of propylene oxide 1: 4 with a molecular weight of 4,500 and an olefinic ester of polyoxyethylene glycol 600 and homogenize at 60 ° C. 100 parts of a red 147 pigment cake containing 50% of water are added and 400 parts of water are added. The whole mixture is homogenized in a 10 minute mixer. After addition of 200 parts of cold water, the treated pigment is centrifuged and dried. EXAMPLE 6 To 50 parts of polypropylene powder, 30 parts of 2-ethylhexyl ether of copolymer ethylene oxide and propylene oxide 1: 4 of molecular weight of 3,500 are added and the mixture is homogenized on a high speed mixer at normal temperature for 5 minutes. To this, 100 µl of a yellow145 filter cake containing 40% water is added and the carbon black mixture homogenized for 15 min. on a stirrer and dried at 70 ° C under vacuum. Increasing the coloring strength (RFS) of the concentrates prepared from the treated pigments against the concentrates produced by the classical methods, determined by measuring the fiber emissivity produced from the concentrates. RFS concentrates from the treated pigment compared to the classical Number of concentrates from the same pigment example 1. 135% 2. 125% 3. 106% 4. 131% 5. 128% 6. 132% SUBSTITUTE Surface treatment of pigments coloring of polyolefins in that, after grinding in an aqueous medium, the pigment is homogenized with polyoxypropylene glycol or a water-insoluble co-polymer of ethylene oxide and propylene oxide with a molecular weight of 600 to 10,000 or their ethers with higher alcohols or carboxylic acid esters with a number of C 5 carbon atoms. to about 20 ° C, or mixtures thereof, without or in the presence of a powdered polyolefin, at a temperature of 20 ° C to 100 ° C, and after separation, the treated pigment is dried.