DE10031986A1 - Preparation of a filler used in the automobile industry comprises premixing a binder, pigment and a solvent and dispersing filler and/or pigment to a viscosity of below 1000 mPas - Google Patents

Abstract

Preparation of a filler comprises mixing a binder and a solvent and dispersing pigment and/or filler to the required viscosity of below 1000, preferably below 300 mPas. An Independent claim is included for an apparatus comprising a dosing device, a first container, inlets, a disperser, an extruder, a dosing device for the premixture and a second dosing device for a solid.

Description

The invention relates to a method for producing filler Premixing of at least one binder, at least one solvent, at least one pigment and / or filler and optionally one or several additives, by subsequently adding a filler and by Dispersion of the mass obtained up to the desired viscosity.

A method of the type mentioned at the outset is known from EP 0 556 757 A1. In this process, the components are premixed in one high-speed agitator mill, preferably in a closed Pearl or sand mill. The product of the premixing reaches one Viscosity from 11,000 to 16,000 mPa.s. However, the known method has the Disadvantage that due to the high viscosity values during premixing economical dispersion using machines commonly used in the paint industry Practice is hardly possible. In addition, a central manufacturing problem of Filling not addressed: While paints and other coating materials in Batches of e.g. B. 10 t, 20 t, 40 t or more can be easily produced can, the practically realized batch size is with leveling compounds have been used in particular for industrial and motor vehicle coating since Decades at 1 t to 2 t. This labor-intensive small production is due to the use of dissolvers that heat a lot in the reactive fillers enter. With increasing batch size, heat dissipation becomes more difficult and thus a uniform dispersion less and less realizable. larger Batches would be due to the lower manufacturing costs associated with this urgently necessary.

The object of the present invention was therefore to implement the method of the introduction mentioned type to improve such that it is under practical conditions is feasible and leads to large batches that lead to the lowering of Production costs are to be aimed for.

This object is achieved in that the plurality of Recipe ingredients is premixed, the viscosity of those obtained there  Mixture remains below 1000 mPa.s, preferably below 300 mPas. This Premixing is preferably carried out using those customary in the paint industry Dissolvers or other high-speed stirring units. Under a Usually, a high-speed agitator disk assembly becomes a dissolver understood with a circumferential speed of typically over 20 m / s.

After premixing, a filler or is added Pigment, which after the dispersion of the filler obtained Viscosity of the pre-mixed filler proportion below 1000 mPa.s the usual level for scraper after dispersion increases. The The complete filler is preferably dispersed continuously.

The premixing is preferably carried out via an "inline mixer", which follows the The rotor / stator principle works, disperses and, if necessary, via a reserve vessel continuously fed to an extruder. There is also the missing solid metered in continuously and precisely according to the recipe and then dispersed. Since the extruder as Screw press works continuously is a continuous one Large batch production possible.

The filler is preferably based on unsaturated polyesters manufactured. These have increasingly become the starting products for the production of fillers, especially for industrial painting and automotive painting and for the refinishing of motor vehicles witnesses are used, enforced.

In addition to the unsaturated polyesters (binders), they can also be used as fillers leading premix still solvents such as. B. styrene for viscosity adjustment and additives such as metal soaps, amines and stabilizers (e.g. hydroquinone Reactivity control solutions included. Usual solids, mostly are not used in high concentrations in leveling compounds. B. coloring pigments such as iron oxides, titanium dioxides or carbon blacks and fillers such as z. B. aluminum silicate, kaolin, silicon dioxide, barium sulfate, finer talc or chalk. The type and amount of fillers usually have a diverse effect on the Processability of the uncured filler and the properties of the  hardened spatula and will not be explained here. Also special properties such as B. electrical conductivity (through conductive carbon blacks) and metallic appearance (due to metal flakes) are usually low To achieve additions of the corresponding effect substances. Specific Viscosity properties can be achieved with small amounts of very fine particles Adjust solids and / or long-chain organic compounds. The up Raw materials from fillers described here can all in the Premix can be used.

The filler mixed in after the premixing is preferably essentially around talc (magnesium silicate), which in Compared to the other components, it has a significantly higher oil requirement. Other fillers that can be used after premixing are, for example Aluminum silicate, kaolin (slate flour), silicon dioxide and the like. The amount The talc on the filler is usually compared to the others Components relatively high, typically 20-60 weight percent. The High viscosity of the finished filler is mainly due to the talc causes. It is therefore possible to use the remaining parts in the manner according to the invention premix the formulation with the exception of talc at low viscosity and then add the talc. The now highly viscous Putty can then be continuously dispersed in the extruder.

The invention further relates to a device for performing the above mentioned method, containing at least one vessel with a quick running stirrer, preferably a dissolver, metering devices for the addition of binders, solvents, pigments and / or fillers and if necessary additives to the high-speed stirrer, one in the derivation for the premixed product from the dissolver arranged dispersing machine, preferably an "inline mixer" based on the rotor / stator principle, and one final dispersing machine with a metering device for one Filler and / or pigment. With this final dispersing machine it is preferably an extruder which is the continuous Dispersion of the viscous filler / pigment allows. Between the two dispersing machines should be practical  Reasons to provide a storage vessel as a buffer that is continuous Ensures production of the filler. Instead of the storage container, too with several dissolver vessels the necessary premix reserve for the continuous production are maintained.

The invention is explained below by way of example with the aid of the figure.

The single figure shows a device for the production of fillers, which are particularly suitable for use in motor vehicle repair coating. The device contains a container 4 with a high-speed stirrer, preferably a dissolver. Apart from the main filler / main pigment, the individual formulation components can be added in a sensible sequence using the usual metering devices such as scales, rotary valve or similar devices.

After mixing the components of the premix, this is the leveling compound without the main filler / main pigment, after opening the valve 9 , the compound is passed through a drain 15 through an "inline mixer" 7 according to the rotor / stator principle. The solid components of the premix are dispersed in the inline mixer. The premix here typically has a viscosity of less than 140 to 160 mPa.s. To better utilize the entire production system, at least one additional container 5 for weighing the premixers should be provided with a high-speed stirrer, preferably an additional dissolver, and a valve 12 . In this mode of operation, the pump 10 and the valve 11 in the line from the container 4 to the inline mixer 7 are not necessary.

After the premix has been dispersed in the inline mixer 7 , the premix should be brought into a storage container 6 via the discharge line 16 . This storage container is not absolutely necessary for the device of the invention, but it facilitates the precise formulation of the two material flows during the final dispersion in the extruder 8 . The storage container 6 should be equipped with a slow-moving mixing tool in order to rule out separation of the premix components.

The premix is fed continuously via a metering device 13 to the extruder 8 via a discharge line 16 directly from the inline mixer 7 or, if appropriate, via a discharge line 17 from the storage container 6 . The main filler / main pigment (the still missing residual component of the leveling compound formulation) is likewise fed continuously and precisely to the extruder 8 via a feed line 3 and a second metering device 14 . The main filler / pigment is preferably relatively coarse talc. Suitable metering devices 13 , 14 can, for. B. pumps, rotary valves, weighing devices and / or screw conveyors.

The final, continuous dispersion to the desired large batches then takes place in the extruder 8 .

According to a development of the invention, the premix can already be produced continuously. For this purpose, the valve 11 must be closed in the figure and the valves 9 and 10 must be open. Binder, solvent and, if appropriate, additional liquid additives are continuously added to the first container 4 with a first high-speed stirrer via a feed line 1 to the recipe. The liquid level is kept constant because of the more even distribution of the individual components, e.g. B. to two thirds (2/3) of the container volume. The liquid mixture is continuously fed from the container 4 via a discharge line with a pump 10 to the second container 5 with a second high-speed stirrer, preferably a dissolver. Solid, that is fillers and / or pigments, is also fed continuously and in a precise dosage to the second container 5 via a separate feed line 2 . The liquid level is also kept constant in the second container 5 . The premix thus continuously produced is fed to the inline mixer 7 via a section 15 and, as described above, is fed directly to the metering device 13 or via the storage vessel 6 and then continuously to the extruder 8 .

Claims (8)

1. A process for the production of filler by premixing at least one binder, at least one solvent, at least one pigment and / or filler and optionally one or more additives, by subsequently admixing a filler and / or pigment and by dispersing the mass obtained to the desired level Viscosity, characterized in that the viscosity of the premixing remains below 1000 mPa.s, preferably below 300 mPa.s. 2. The method according to claim 1, characterized in that the dispersion of the complete Leveling compound is carried out continuously. 3. The method according to claim 1 or 2, characterized in that the filler is based on unsaturated polyesters is produced. 4. The method according to at least one of claims 1 to 3, characterized in that the admixed filler essentially Contains talc. 5. The method according to at least one of claims 1 to 4, characterized in that the admixing and final dispersion takes place in an extruder ( 8 ). 6. Device for carrying out the method according to one of claims 1 to 5, comprising at least one first container ( 4 , 5 ) with a high-speed stirrer, preferably a dissolver,
Metering devices ( 1 , 2 ) for the addition of the raw materials required for the premixing into the first container, a continuously operating dispersing unit ( 15 , 16 , 17 ) for the premixed product from the first container ( 4 , 5 ). 7 ), preferably an inline mixer, and a first metering device ( 13 ) for the premixing,
an extruder ( 8 ) in which the discharge line ( 15 , 16 , 17 ) for the premixed product leads from the first container ( 4 , 5 ), and a second metering device ( 14 ) for adding a solid to the extruder. 7. The device according to claim 6, characterized in that between the department ( 16 ) of the continuous dispersing unit ( 7 ) and the metering device ( 13 ) for the inflow of the premix in the extruder ( 8 ) still an additional reserve vessel ( 6 ) with a mixing unit is arranged. 8. The device according to claim 6 or 7, characterized in that the device contains metering devices for the continuous addition of binders, solvents, pigments and / or fillers and optionally additives to the at least one first container ( 4 , 5 ).