EP1175256B1 - Mobile device for continuously or discontinuously producing aqueous liquid dyes comprised of powdery constituents and water - Google Patents

Abstract

The invention relates to a mobile device for continuously or discontinuously producing aqueous liquid dyes comprised of powdery constituents and water. Said device consists of a mobile frame (1) equipped with: a) a mixing unit comprised of a mixing motor (2), of the dissolver (3), and of the mixing container (4), equipped with; b) a dosing unit provided with a dosing motor (5), with the filling container (6) containing a delivery element (7), and with the filling hopper (8), and equipped with; c) a switch unit (9) provided with control elements for controlling the dosing process and the mixing process. The inventive device is characterized in that the delivery element (7) is a rotatable distribution disc (11) equipped with a distribution chamber (10), and the dosing unit is equipped with a weighing cell (12).

Description

The invention relates to a mobile device for continuous and discontinuous production of aqueous liquid colors from powdery components and water, especially based on dispersible polymer powders, and a process for the production of aqueous liquid colors by means of dispersion of powder compositions in water using this device.

Aqueous liquid colors, especially emulsion paints in the factory at the paint manufacturers in large dimensions Dissolvers made. To do this, water is first used in the dissolver, optionally in a mixture with secondary components such as Wetting agents, anti-foaming agents, preservatives are presented and with high-speed agitator pigments and fillers slowly entered. After the dispersing process the pigment paste obtained in this way with a slowly running agitator mixed with a plastic dispersion as a binder. The finished color is delivered in containers, which one Have water content in the emulsion paint from 30 to 50%.

Plastic powders (dispersion powders) redispersible in water can also be used to produce emulsion paints. With the development of water-redispersible plastic powders such as the Vinnapas ^R dispersion powders from Wacker-Chemie, it is now possible to avoid the transport of the large amount of water in the emulsion paint and to mix the emulsion paint directly at the processing site using a powder mixture and water. So far, the procedure has been such that the dispersion powder or the powder composition containing the dispersion powder was stirred into the mixing water on site by means of a stirring stick or a drill equipped with a stirrer. As a rule, however, this procedure does not achieve the same quality as with a liquid emulsion paint manufactured in the factory in permanently installed dissolvers.

FR-A 2743509 relates to a large-volume, stationary facility for mixing powdered materials with liquids for the production of detergents. To do this a powder container via a pipe, which is at the top At the end of the mixing container, fill it with powder. The mixing container is on one to check the filling weight Weighing device set up. So that the weighing does not go through that The weight of the pipeline filled with powder is affected is supported by a support.

DE-A 19714264 describes a mobile device for production of aqueous liquid paints from powdery components and known with the water because of their mobility liquid, aqueous emulsion paints at the place of application (construction site) from powdery components and water in of a quality that was previously only available in large dimensions, industrial mixers was possible. This The disadvantage of the device is that it is only a discontinuous one Production of the emulsion paint is possible. With this device must namely the added amount of powder Ingredients weighed and added the amount of water programmed according to the recipe is then added.

The task was therefore to develop a mobile device with which a liquid paint is made from powdery components can also be produced in a continuous driving style can.

a) einer Mischeinheit aus Mischmotor 2, dem Dissolver 3 und dem Mischbehälter 4, und

b) einer Dosiereinheit mit Dosiermotor 5, dem Einfüllbehälter 6 mit einem Förderelement 7, und dem Einfülltrichter 8, und

c) einer Schalteinheit 9 mit Steuerelementen zur Steuerung des Dosiervorgangs und des Mischvorgangs, dadurch gekennzeichnet, daß

das Förderelement 7 eine drehbare, mit einer Zuteilkammer 10 ausgerüstete Zuteilungsscheibe 11 ist, und die Dosiereinheit mit einer Wägezelle 12 ausgerüstet ist. The invention relates to a mobile device for the continuous and discontinuous production of aqueous liquid colors from powdery constituents and water, comprising a mobile frame 1 with

a) a mixing unit of mixing motor 2, the dissolver 3 and the mixing container 4, and

b) a dosing unit with dosing motor 5, the filling container 6 with a conveying element 7, and the filling funnel 8, and

c) a switching unit 9 with control elements for controlling the metering process and the mixing process, characterized in that

the conveying element 7 is a rotatable allocation disk 11 equipped with an allocation chamber 10, and the metering unit is equipped with a load cell 12.

The device will now be described with reference to drawings explained. The drawings show schematic representations of a preferred embodiment.

The mobile device according to Figures 1 and 2 comprises a mobile Frame 1, for example one provided with lockable rollers Metal frame. At the top of the frame 1 is the Dosing unit for dosing the powdery components arranged, which is a cylindrical, open top, filling container 6 includes. For filling the filling container 6 it is equipped with a hopper 8. In a preferred embodiment is the hopper 8 with a Lid 13 can be closed. The dimensioning of the hopper 8 is arbitrary, in general the volume is from 5 to 50 liters. The diameter of the filling container 6 is preferably from 150 to 400 mm.

For dosing the powdery filling material into the mixing container 4 is the filling container 6 at its lower end, lying on the bottom of the filling container, with a conveyor element 7 equipped. The conveying element 7 is in FIG. 3 shown and comprises an allocation disc 11, for example a rotor disc with a diameter of the filler container 6 corresponding diameter, preferably 150 to 400 mm diameter. The thickness of the allocation disk 11 is preferably 25 to 50 mm. The allocation disk 11 can Metal or plastic, preferably made of plastic, for example Teflon. Allocation of the product in the mixing container takes place via an allotment chamber 10. The allotment chamber 10 provides a recess of any shape on the allocation disc 11 is expedient that the recess of the allocation disk 11 is dimensioned that the powder through the opening 14 of the bottom of the hopper 6 can be conveyed into the mixing container 4; in the generally, the footprint of the allotment chamber 10 is greater than that of the opening 14. Generally becomes obtuse Cut out a segment of a circle, preferably at an obtuse angle means an angle greater than 45 °. Preferred is the in The direction of rotation of the allotment chamber surface is convex. The allocation disk 11 is driven by the metering motor 5. A slow-running has proven successful for funding Disc with a circulation speed of 10 to 20 rpm.

The bottom of the filling container 6 has the area which protrudes into the mixing container 4, via an opening 14, via which the powder material from the allocation chamber 10 in the Mixing container 4 is promoted. The filling container 6 is non-contact arranged on the upper edge of the mixing container 4 so that the opening 14 of the filling container 6 above the mixing container 4 lies. In the rest position, when filling the filling container 6, the allocation disc 11 covers the opening 14th

The mixing container 4 is usually one cylindrical container, possibly with a rounded bottom, which is preferably made of metal, for example stainless steel is. The diameter D of the mixing container 4 is preferably 200 mm to 400 mm. The ratio H / D from the height H the mixing container to diameter D is preferably 1: 1 to 2: 1. To take the finished emulsion paint is the Mixing container 4, preferably at the bottom of the container with a motor-driven extraction valve 15 equipped. Preferably is the mixing tank 4 with a parallel suspension with two parallel handlebars attached to the frame 1.

On the frame 1 below the mixing container 4 is an electronic Load cell 12 arranged with which the continuously the allocation chamber 10 in the mixing container 4 metered amount of powder and the metered amount of water is measured. In the Load cell 12 is a conventional, electronic one Weighing device, as it is also commercially available. This load cell is locked when the mobile device moves and only activated when the device is started up. The load cell 12 continuously detects those in the mixing container added amounts of powder components and water and forwards the measured values to the switching unit 9. On this One way is the metering of the mixture components controlled, and on the other hand, the complete metering registered, and after completion of the dosing the dispersing process initiated by the control.

The mixing of the powdered components of the recipe with the water is done using a dissolver 3. The dissolver 3 includes a vertically downward and centric to Mixing container 4 arranged shaft 3a and a dissolver disc 3b. The dissolver disk 3b is usually around a steel disc, which is equipped with teeth.

In a preferred embodiment, the dissolver 3 can be a steel arm 16 which is firmly connected to the mixing container 4 is to be folded away to the side for better cleaning the mixing container and the dissolver shaft and - Ensure disc. Furthermore, is on the bottom a plate 17 attached to the dissolver, preferably made of Stainless steel, which when the dissolver 3 is lowered into the mixing container 4, closes this completely upwards. An opening of the mixing container 4 or a lateral opening of the In a preferred embodiment, dissolver 3 can only be used for machine switched off. You can do this at the framework of the Mixing container 4 a contact in the form of a safety locking device be attached so that only a currentless opening possible is. When the device is in operation, the mixing container can 4 consequently cannot be opened.

The dispersion performance is essential due to the dimensioning of the shaft 3a and the dissolver disk 3b. The Ratio d / D of the diameter d of the dissolver disc 3b to Diameter D of the mixing container 4 is preferably 0.3 to 0.5. The shaft 3a is preferably dimensioned such that the dissolver disc 3b during the mixing process Floor distance h to the bottom of the mixing container 4 from 0.3 d to 0.7 d can be lowered, where d is the diameter of the Dissolver disc 3a stands.

To control the conveying speed, the conveying volume and the dosing time of the powder components and the water component, to control the stirring speed during the mixing process and the mixing time, finally to control the filling process and the rinse for cleaning is the one according to the invention Device equipped with a switching unit 9. at the switching unit 9 is a commercially available, freely programmable electronic control element with it customized software. The switching unit is preferably with a colored, two-part display, with which the optimal mixing ratio of powder and water, the mixing times and the addition rates of water and powder can be entered and the program sequence is observed can. Furthermore, the function status is always on the display the mobile device and it is displayed which further steps should follow.

An embodiment in which the device is also preferred equipped with a connection 18 for supplying water is. A permanently installed one leads from the water connection Line 19 to the mixing tank 4. At the water connection can also an additional water extraction facility is created, from which, for example, water is taken to clean the device can be.

The finished mixed color is generally filled into buckets. Therefore is in a preferred embodiment on the frame a component (bucket guard) installed, which monitors whether a bucket is ready for filling, so that no subordinate Bucket the control to remove the finished product Color does not allow. In a further preferred embodiment is the device with a level indicator Ultrasound base equipped with the fill level of the bucket can be monitored.

Another object of the invention is a method for Production of aqueous liquid colors by means of dispersion powder compositions, preferably dispersion powder compositions in water using this device. Due to the built-in load cell, it can now run continuously be worked, since any amount of powder Material can be refilled without these being exact beforehand must be weighed because the load cell 12 metered amount of powder is continuously and precisely measured, and the amount of water required by the switching unit depending on the recipe 9 is automatically allocated.

The powdery constituents, optionally as a mixture, filled in the hopper 8 and by means of the allocation disc 11 continuously conveyed into the mixing container 4. The quantity added is continuously from the load cell 12 measured and the metered amounts to the switching unit 9 reported. To stick the powdery particles Preventing on the wall of the mixing container 4 is preferred part of the water, generally half to two thirds of the total amount of water in the recipe in the mixing tank 4, submitted. After completing the filling process, the Dissolver 3 started by the switching unit 9. The speed of rotation of the dissolver 3 can be set variably and are adapted to the respective production status. The stirring speeds are preferably 500 to 1500 Rpm, with the procedure being such that during the dispersion is worked with a higher stirring speed, and after stirred the dispersion phase at low speed becomes.

The recipes for the production of aqueous liquid colors are known to the person skilled in the art and do not require any further explanation here. In general, the compositions contain in addition pigments, for example the dispersion powder Titanium dioxide or inorganic or organic colored pigments, Fillers such as calcite, dolomite or chalk. Are suitable also compositions which, in addition to the dispersible polymer powder other binders such as lime, water glass and / or cement contain. It is also possible to use liquid, watery colors using powdered binders such as silicone resin powder, alone or in combination with dispersion powder.

The addition of water, the powder delivery, the duration of the mixing process, the dispersing process, and optionally the Varying the conveying speed of the powder and the speed of rotation of the dissolver, is via the switching unit 9 automatically regulated. The entire manufacturing process will from the start of filling to the removal of the finished dispersion carried out under program control, the optimal mixing ratios, Mixing times, dosing rates and the dissolver speed are preprogrammed and all process steps expire automatically. The switching unit 9 ends the Mixing process automatically. After the dispersion has ended is the finished liquid paint on the sampling valve 15 for filling taken.

A new mixing process is preferably only complete after Emptying of the mixing container 4 started. But it can also be proceeded in such a way that, despite the fact that one Remaining amount in the mixing container 4 initiated a new mixing process becomes. By using the load cell, color approaches are possible produce different amounts, so that a even greater flexibility in terms of what is actually needed Color quantities are guaranteed.

In order to avoid color build-up during longer standing times, you can In a further preferred embodiment, this is also done be that after the complete removal of the thus obtained Liquid paint automatically replenishes water, which achieved an immediate rinsing of the mixing container 4 becomes. The control can be set so that the Operator can decide whether to add water alone to serve the cleaning of the mixing container 4 or as Approach to be used for a new mixture.

Manual operation is limited in the preferred one Embodiments of the method on filling the powder Material and the removal of the ready mixed liquid color. The advantage of the device according to the invention is that due to the mobile mixer in is able to apply a liquid, aqueous emulsion paint directly at the place of application, for example at the construction site, from the To manufacture powder components and water of high quality, to obtain the previously only with dissolvers installed at the factory was. With the monitoring of the dosage by means of the load cell 12 continuous operation is now possible. It is no longer necessary to weigh the batches precisely Amounts of powder are added, which then with the corresponding Amount of water to be mixed. With the load cell the continuous dosing is monitored and with the switching unit 9 continuously fed the appropriate amount of water.

Claims (7)

1. Mobile apparatus for continuous and batchwise preparation of aqueous liquid paints from powderous ingredients and water, comprising a movable frame 1 having

   a) a mixing unit comprising mixing motor 2, the dissolver 3 and the mixing vessel 4, and

   b) a metering unit with metering motor 5, the filling vessel 6 with a conveying element 7, and the filling hopper 8, and

   c) a switching unit 9 with control elements for controlling the metering operation and the mixing operation, characterized in that

   the conveying element 7 is a rotatable apportioning disc 11 equipped with an apportioning chamber 10, and the metering unit is equipped with a weighing cell 12.
2. Mobile apparatus according to Claim 1, characterized in that the apportioning disc 11 has a diameter of from 150 to 400 mm, corresponding to the diameter of the filling vessel 6, and a thickness of from 25 to 50 mm.
3. Mobile apparatus according to Claim 1 or 2, characterized in that the apportioning chamber 10 constitutes a recess on the apportioning disc 11 in the form of an obtuse-angled circle segment, obtuse-angled meaning an angle of greater than 45°.
4. Mobile apparatus according to Claim 3, characterized in that the area of the apportioning chamber 10 that points in the direction of rotation is of convex construction.
5. Mobile apparatus according to Claim 1 to 4, characterized in that the weighing cell 12 constitutes a conventional electronic balance and is disposed below the mixing vessel 4.
6. Process for continuous and batchwise preparation of aqueous liquid paints by means of dispersing powder compositions in water using an apparatus according to Claim 1 to 5, characterized in that the weighing cell 12 continuously detects the amounts of powder ingredients and water added into the mixing vessel and passes the measurements on to the switching unit 9.
7. Process according to Claims 6, characterized in that the overall process from the start of charging to the removal of the finished dispersion proceeds under programme control, the optimum mixing ratios, mixing times, metering rates and the dissolver speed having been preprogrammed in the switching unit 9, and all steps of the process proceeding automatically.

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