DE2049225A1 - Dispersible pigment prodn - by grinding with aq dispersions of polyethylene oxidised polyethylene or montan wax - Google Patents

Abstract

An aq. dispersion of polyethylene, oxidised polyethylene or montan wax is added to the dry pigment or pre-ground pigment dispersion on a mineral substrate before or during grinding. The solids content of the additive is 2-30% of the wt. of pigment (dispersion). Suitable pigments are phthalocyanines, perylene, tetracarboxylic acids, anthraquinone, quinacridone, and their derivs. azo, polyazo and nitroso-iron complex pigments. Suitable oxidised polyethylene contains 3-7 wt.% oxygen. Addition of the dispersion may be carried out in an edge mill or high-speed mixer. Ease of dispersion of the pigments in thermoplastics is improved.

Description

Process for the production of thermoplastics easily distributable pigments Pigments can often only be produced with great effort and energy be incorporated into thermoplastics homogeneously disperse. It is known, that by dry grinding the pigments, which in this context also are referred to as colored pigments, with substrates such as heavy spar, precipitated barium sulfate (Blancfix), calcium carbonate, kaolin, titanium dioxide or mixtures of these substances, can improve the dispersibility of the colored pigments. This dry grinding of colored pigment and substrate is also called gelatinization and the resulting mixture made of colored pigment and substrate known as muller color. The improvement of distributability the colored pigments in thermo-plastic plastics by grinding with the substrate however, there are narrow limits, so that even after this process there are no pigments or mulled colors can be obtained with significantly improved spreadability.

It has now been found that one gives way to thermoplastics distributable pigments or pan paints are obtained if you use the dry pan paints or the dry pigment before or during the curling 2 to 30 percent by weight, calculated as a solid and based on the pan paint or the pigment, one aqueous polyethylene primary dispersion, an aqueous dispersion of oxidized polyethylene or a montan ester wax or mixtures of these dispersions.

Pigments and colored pigments are mainly used for the process organic pigments such as phthalocyanines, polyhalophthalocyanines, Perylenetetracarboxylic acid and its derivatives, e.g. the diimides, violanthrone and isoviolanthrone and their derivatives, anthraquinone derivatives, ohinacridone and its derivatives, AZO and Polyazo pigments and nitroso iron complex pigments.

Barium spar, precipitated barium sulphate (Blancfix), Calcium carbonate, kaolin, titanium dioxide and mixtures thereof can be considered.

As aqueous dispersions for the process of the invention are polyethylene primary dispersions, aqueous dispersions of oxidized polyethylene or those of montan ester waxes and their mixtures are suitable. The polyethylene primary dispersions are polymerized of ethylene in the presence of radical formers such as persulfates, aliphatic azo compounds and / or peroxides and aqueous emulsifier solutions produced under pressure.

The production of such dispersions is known.

Oxidized polyethylene is made by oxidizing molten polyethylene in the presence or absence of oxidation catalysts at temperatures up to 250 ° C obtained in a known manner. Oxidized polyethylene is suitable, the one Has an oxygen content of 3 to 7 percent by weight.

The production of montan ester waxes is known. You will go through Esterification with mono- or polyhydric alcohols in chromium-sulfuric acid oxidation Montan wax acids obtained from montan wax.

The easily spreadable pigments and muller colors are e.g.

obtained by the dry mixture of colored pigment / substrate or the dry pigment alone clumps and the dispersion during clumping adds in portions. But you can also use the entire amount of the dispersion before Admit the curdling all at once. The amount of the dispersion - calculated as a solid substance - is 2 to 30, preferably 4 to 20, percent by weight, based on the muller color or the pigment.

Similar good results can be obtained by using the dispersion in a high-speed mixer, e.g. the one under the trademark 1Fluidmisoher Henschel " known mixer, brings directly to the colored pigment. The substrate can be in this Still fall can be incorporated subsequently without affecting the distributability is reduced in thermoplastics.

The use of stable polyethylene dispersions or stable dispersions of oxidized polyethylene or montan ester wax has the advantage that the polyethylene or the montan ester wax in a simple way on the colored pigment or the muller color can be applied. Thereby - even in the presence of substrate - the in the Because of the larger surface area, the solids contained in dispersions are preferred on the Color pigment applied. In the case of mulled paints and pure pigments, based on the (colored) pigment, based on almost the same amount of the dispersions on the solid, required in order to achieve equally good spreadability. Of the The process of the grinder process is not influenced by the added dispersion, since their amount is not significant in comparison to the total amount of pigment or muller color is. As a rule, the water introduced with the dispersion evaporates during the process the curling, so that a longer drying of the finished pan is no longer is required.

Compared to pan paints made without the addition of the dispersions mentioned have been produced, the pan paints can be prepared according to the method of the invention Disperse significantly more easily. The difference is especially noticeable when you look at it as pigments or colored pigments, phthalocyanines, polyhalophthalocyanines, perylenetetracarboxylic acid un its derivatives, isoviolanthrone and its derivatives and anthraquinone derivatives are used.

The exemplary embodiments explain the method. The parts mentioned and percentages are based on weight.

Example 1 A mixture of 180 parts of barite and 20 parts Phthalocyanine blue of the alpha modification is ground in a pan grinder. Of the Paint will be 72 parts of a 40% polyethylene primary dispersion in proportions during added to the mulling.

The pan grinder process is over after 30 minutes.

To 100 parts of a mixture of 70 parts of emulsion polyvinyl chloride, 30 parts of diethylhexyl phthalate and 1 part of titanium dioxide becomes 1 part of the above Added muller color. The colored pigment is complete after 3 to 4 minutes of rolling dispersed in the polyvinyl chloride mixture.

Example 2 A mixture of 190 parts of barite and 10 parts Pigment Red 179 (Color Index) is ground in a pan grinder.

During the grinding process, 25 parts of a 40% polyethylene primary dispersion are used gradually added. The colored pigment is ground out after 30 minutes.

To 100 parts of a mixture of 70 parts of emulsion polyvinyl chloride, 30 parts; dibutyl phthalate and 1 part titanium dioxide are added to 1 part of the mulled color. This is already after 4 to 5 minutes of Linwalzzeit on the hot mixing roller (16000) Color pigment dispersed homogeneously and has developed its full color strength.

Example 3 imine a mixture of 190 parts of barite and 10 parts Pigment Violet 33 (C.I.) is ground in a pan grinder. Gradually become 40 parts of a 25% montan ester wax dispersion were added during the grinding process. After 40 minutes the pigment is ground out.

To 100 parts of a mixture of 75 parts of suspension polyvinyl chloride, 25 parts of dibutyl phthalate and 1 part of titanium dioxide are added to 1 part of the mulled color. After 4 minutes of rolling on the hot mixing roller. (16000) is the BuntpigN ment completely dispersed.

Example 4 A mixture of 190 parts of barite and 10 parts Phthalocyanine green (C.I. Pigment Green 7) is ground in a pan grinder. 32 parts a 30% dispersion of an oxidized polyethylene (oxygen content: 5%) gradually added.

On a mixing roller at 120 ° C you can mix 1 part of muller paint in 100 Distribute parts of the high-pressure polyethylene perfectly with just a few passages. as well The muller color behaves favorably in extruder coloring.

Example 5 500 parts of phthalocyanine blue of the alpha-M modification are used in a high-speed mixer, e.g. a Henschel fluid mixer, filled and then 375 parts of a polyethylene primary dispersion of its own were added in portions. To the mixer is switched on for 2 minutes for each addition; total mixing time approx 10 mins. The treated pigment is used to remove any water that is still adhering then dried at 6000.

To a mixture of 70 parts imisions-polyvinylchloride 30 parts 1 part of the treated pigment is added to dibutyl phthalate and 1 part of titanium dioxide puts. After 5 minutes of rolling on the hot mixing roll, the pigment is in the Polyvinyl chloride mixture completely dispersed.

Example 6 6 A mixture of 190 parts of barite and 10 parts Pigment Violet 19 (O.I.) is ground in a pan grinder. Gradually become 40 lines of a 25% montan ester wax dispersion were added during the grinding. The pigment is ground out after 45 minutes.

To a mix of.

75 parts of suspension polyvinyl chloride, 25 parts Dibutylphthal and 1 part of titanium dioxide are added to 1 part of the mulled color. To This is a roll-in time of 4 minutes on the mixer roller (temperature 160 ° C) Colored pigment is completely light.

moderately dispersed.

Claims (1)

Claim Process for the manufacture of thermoplastic plastics easily distributable mulled paints or pigments, characterized in that one of the dry Muller color or the dry pigment before or during the mulling 2 to 30 Percentage by weight, calculated as solids and based on the muller color or that Pigment, an aqueous polyethylene primary dispersion, an aqueous dispersion of oxidized polyethylene or a montan ester wax or mixtures of these dispersions admits.