Apparatus and method for producing a tire sealant and applying the tire sealant to pneumatic vehicle tires

Abstract

Device (10) for producing a tire sealant and applying the tire sealant to pneumatic vehicle tires (8), wherein the device (10) comprises at least the following components: - A first mixing device (1) having a first inlet opening (2), wherein the first mixing device (1) can be operated continuously; - an intermediate storage device (9) connected to the first mixing device (1); - A pumping device (4) suitable for conveying the mixed material mixed in the first mixing device (1); - A second mixing device (5) with at least one second inlet opening (6); - An outlet (7) through which a tire sealant can leave the device (10) and be applied to vehicle pneumatic tires (8); - wherein the components can be connected to one another in such a way that a continuous material flow from the first mixing device (1) to the outlet (7) is possible.

Description

[0001] The invention relates to a device for producing a tire sealant and applying the tire sealant to pneumatic vehicle tires and a method for producing a tire sealant and applying the tire sealant to pneumatic vehicle tires.

[0002] Self-sealing pneumatic vehicle tires are known, for example, from DE 10 2006 059 286 A1 by the applicant. In this case, standard tire designs are subsequently provided with a layer of sealant. The sealant is a self-adhesive, viscous sealing compound that is applied as a layer from the radially innermost tire layer in the projection area of ​​the belt package to the radially innermost tire layer, the largely airtight inner layer. The sealant layer is capable of independently sealing punctures up to five millimeters in diameter. After a puncture has penetrated the tread and through the inner layer, the sealant completely encloses the penetrated foreign body, sealing the interior from the environment and thus preventing a loss of air pressure in the tire. The driver of the vehicle is not forced to immediately replace the defective tire with a full-size spare tire or an emergency tire.

[0003] The sealant is characterized by airtightness, strong adhesiveness and balanced flow behavior.

[0004] WO 2008 / 141 848 A1 discloses a process for producing a tire sealant, which is produced from two sealant components A and B.

[0005] Components A and B are produced separately and then combined by pumping and dosing. The membrane dosing process described above is particularly complex.

[0006] When producing sealant components separately, storage can also be challenging. If more of one component is produced than another, the excess must be stored and removed from the storage facility, which is a laborious process. This can also lead to aging processes in the stored components, which can affect the quality of the tire sealant.

[0007] DE 10 2004 011 670 A1 relates to a process for producing a thermoplastic elastomer composition, wherein a voluminous rubber and a thermoplastic resin are introduced into an extruder and mixed together by melt-kneading.

[0008] DE 10 2015 224 957 A1 relates to a method and a device for producing a modified rubber mixture, wherein an input rubber mixture consisting of a masterbatch with a rubber component is admixed with supercritical CO2 in a pressure- and gas-tight unit that is closed off to the outside at a pressure of at least 63 bar and a temperature of at least 31 °C and is subsequently extruded at maintained or increased pressure and with the introduction of mechanical energy.

[0009] DE 10 2016 013 785 A1 relates to a tire sealant mixing device which comprises, inter alia, a forming extruder equipped with conical converging twin screws located in a mixing chamber having an input area with relatively low pressure and a channeling area with relatively high pressure.

[0010] US 2011 / 0 146 883 A1 relates to a method and a device for continuous mixing, in particular for tire rubber compounds, wherein a first, second and third extruder are used to apply a mixed rubber mixture directly onto a tire building drum or a tire building core.

[0011] US 2017 / 0 080 655 A1 relates to a method for applying a self-sealing composition to the inner surface of a tire, wherein an initially non-crosslinked self-sealing composition is applied by means of an application nozzle in such a way that, under adapted temperature and speed conditions, a crosslinked bead is applied directly to the inner surface.

[0012] US 2018 / 0 200 975 A1 relates to a method for producing a pneumatic tire, wherein a sealant is prepared by mixing starting materials, including an organic peroxide, stepwise using a twin-screw kneading extruder and is gradually applied to an inner surface of a tire.

[0013] US 5 198 171 A relates to a process for the continuous production of a heat-vulcanizable silicone rubber mixture, wherein in a first step a flowable particle mixture is produced by means of a high-speed shearing machine in order to feed it in a second step at a constant feed speed to a continuous kneading and extrusion machine with two screws rotating in the same direction.

[0014] The present invention is therefore based on the object of providing a device for producing a tire sealant and applying the tire sealant to pneumatic vehicle tires, which enables comparatively simple production of the tire sealant and its application to pneumatic vehicle tires. At the same time, a method for producing a tire sealant and applying the tire sealant is to be provided, which leads to optimized quality of the tire sealant. In particular, complex intermediate steps, such as storing a component over a longer period and in a larger quantity, are to be avoided. In particular, it is to be possible to fill a large number of tires with the tire sealant as continuously as possible.

[0015] The object is achieved according to the invention by a device which comprises at least the following components: - A first mixing device having a first inlet opening, wherein the first mixing device can be operated continuously; - An intermediate storage device connected to the first mixing device; - A pumping device suitable for conveying the mixture mixed in the first mixing device; - A second mixing device with at least one second inlet opening; - An outlet through which a tire sealant can leave the device and be applied to vehicle pneumatic tires; - wherein the components can be connected to one another in such a way that a continuous material flow from the first mixing device to the outlet is possible.

[0016] Because the device has the aforementioned components, which can be connected to one another, a finished tire sealant can be easily produced in the device and dispensed from there into pneumatic vehicle tires. In particular, component A of a tire sealant can be continuously produced as a mixture in the first mixing device. When changing from an inflated tire to a tire to be inflated, the first component can continue to be produced in the first mixing device and quantities of the first component can be temporarily stored in the intermediate storage unit and discontinuously removed therefrom during the ongoing process. The pumping device can also compensate for the downtimes during tire changes through discontinuous operation and convey component A further as required.Thus, the device enables a quasi-continuous process for filling a large number of tires with a tire sealant, taking tire changes into account.

[0017] In the second mixing device, component B of a tire sealant can then be introduced through the second inlet opening, so that components A and B can be mixed to form the tire sealant in the second mixing device. A key advantage of the invention is that component A does not need to be produced separately and temporarily stored outside the device. The device enables the production and discharge of the tire sealant in (quasi-)continuous operation.

[0018] The expression "wherein the components are interconnectable in such a way that a continuous flow of material is possible from the first mixing device to the outlet" means that the components can be separated from each other by temporarily closing a connection between two components, particularly to slow the flow of material during tire changes. However, the components are fundamentally part of the device and thus interconnected in such a way that material can flow through the device from the first inlet opening to the tire without leaving the device.

[0019] In principle, the device can also be used discontinuously, e.g. by stopping the pumping device or the other components for a longer period of time, although this is not preferred.

[0020] Preferably, the device, in particular the pumping device, is designed to produce and apply 1 to 2 kg of tire sealant per tire. The conveying speed of the materials is selected accordingly to ensure uniform application of the sealant.

[0021] Preferably, 1 to 3 kg, preferably 1 to 2 kg, of tire sealant per minute are conveyed from the outlet. In addition to the conveying speed, the volumes of the individual components are also preferably optimally designed for their respective purposes in order to absorb and release the corresponding quantities quasi-continuously.

[0022] According to a preferred embodiment of the invention, the first mixing device is self-conveying. "Self-conveying" means that, during operation of the mixing device, the mixed material is simultaneously conveyed out of the device in a defined direction.

[0023] This allows a pre-pressure for the pumping device to be set. This is particularly advantageous for conveying components of tire sealants containing rubber and filler, especially those with a comparatively high viscosity.

[0024] The first mixing device is particularly preferably an extruder. A twin-screw extruder is especially preferred, as this achieves a better mixing effect than a single-screw extruder.

[0025] Preferably, the twin-screw extruder is co-rotating, i.e. both screws rotate in the same direction.

[0026] It is particularly preferred that the twin-screw extruder has a length of 1 to 2.5 m, with each screw having a diameter of 20 to 40 mm. For example, and preferred, is a twin-screw extruder with a length-to-diameter ratio (L / D) of the individual screws of 56 or correspondingly comparable twin-screw extruders.

[0027] A twin-screw extruder with such dimensions has a particularly suitable volume for producing the amount of component A required for continuous operation.

[0028] According to the invention, the first mixing device is designed so that it can be operated continuously. In principle, other devices are also conceivable in addition to the aforementioned extruders, such as the combination of a mixer with a continuous discharge device.

[0029] The device according to the invention comprises an intermediate storage device which is connected to the first mixing device.

[0030] This allows small amounts of component A to be temporarily stored within the device, particularly for tire changes at the outlet, compared to the prior art. The first mixing device can thus be operated continuously. Removal from the buffer occurs discontinuously.

[0031] In principle, any storage device which is suitable for receiving and releasing the mixture mixed in the first mixing device, in particular component A of a tire coating agent, can be considered as an intermediate storage device.

[0032] For this purpose, the intermediate storage preferably comprises a volume of 1 to 10 liters, particularly preferably a volume of 1 to 5 liters, very particularly preferably 1 to 3 liters, in particular and for example 2 liters.

[0033] Such a volume is suitable for accommodating the required quantities of component A without excessive amounts of A accumulating.

[0034] Particularly preferably, the intermediate storage device is a piston accumulator.

[0035] According to a preferred embodiment of the invention, the pumping device is a gear pump. This is particularly well suited for conveying the mixture from the first mixing device, preferably component A of a tire sealant, and metering it into the second mixing device. A gear pump allows for precise control of the volumetric flow or material flow.

[0036] Dosing is carried out in particular and preferably via the speed of the pumping device, whereby the pumping device is operated discontinuously during tire changes.

[0037] The second mixing device may comprise a static or dynamic mixing element, preferably a static mixing element.

[0038] The volume of the second mixing device preferably comprises 0.05 to 0.2 L. This volume is particularly suitable for operating the device quasi-continuously as described; the volume of the second mixing device thus does not necessarily comprise the filling quantity of tire sealant for one tire, but is optimally designed for mixing the sealant components.

[0039] A further component of a tire sealant, component B, can be introduced through the second inlet opening of the second mixing device, which is then mixed with component A in the second mixing device as described. Since the device is preferably operated quasi-continuously or can be operated quasi-continuously, the addition of component B also takes place discontinuously. For this purpose, a metering system for conveying component B is preferably connected to the second inlet opening. This is particularly preferably a diaphragm metering pump.

[0040] The quasi-continuous pressure of the pumping device, preferably a gear pump, conveys the mixed sealant from the second mixing device to the outlet. The outlet can, in principle, be designed in any way suitable for discharging the tire sealant from the device onto the inner surface of pneumatic vehicle tires. Preferably, the outlet is a nozzle. This allows the sealant to be applied precisely in defined quantities.

[0041] According to a preferred embodiment of the invention, the device comprises a holding device for pneumatic vehicle tires, which is also preferably suitable for rotating a pneumatic vehicle tire. Such holding devices are known.

[0042] Preferably, the holding device can also move the tire along its axial extent, i.e. in the axial direction.

[0043] This allows the tire sealant to be applied evenly to the inner surface of the vehicle's pneumatic tire.

[0044] The inner surface of the pneumatic vehicle tire is preferably at least the surface of the radially innermost layer, usually the inner layer, which is radially opposite the tread and directed inwards.

[0045] The object underlying the invention is also achieved by a method for producing a tire sealant and applying it to pneumatic vehicle tires in the device according to the invention, which comprises at least the following method steps: a) providing at least one masterbatch containing at least one rubber and at least one filler; b) introducing the masterbatch through the first inlet opening into the first mixing device; c) introducing at least one low-viscosity liquid having a dynamic shear viscosity at 100 °C in the range from 1 mPas to 10 Pas into the first mixing device, in particular through at least one third inlet opening; d) mixing the masterbatch with the low-viscosity liquid to produce component A; e) transporting component A by means of the pumping device into the second mixing device; f) introducing a component B containing at least one crosslinking initiator through the second inlet opening into the second mixing device; g) mixing component A with component B in the second mixing device to produce the tyre sealant; h) Outlet of the tyre sealant through the outlet and i) applying the tyre sealant to at least one inner surface of pneumatic vehicle tyres.

[0046] All of the above statements apply to the device and its components.

[0047] It is particularly preferred if the method described above is carried out in quasi-continuous operation of the device, thus applying the tire sealant successively to several pneumatic vehicle tires. This results in the aforementioned advantages, and in particular, eliminates the need for complex intermediate storage of the tire sealant or individual components, in particular A.

[0048] For this purpose, it is particularly preferred that, when changing the pneumatic vehicle tires, the conveying speed of component A, the speed of addition of component B into the second mixing device, the mixing of A and B, and the discharge of the tire sealant are coordinated with one another. As described above, in quasi-continuous operation of the described device, it is possible to temporarily store partial quantities of component A discontinuously in the buffer and then discontinuously remove them from it. The speed of these steps, as well as the amount of component A removed from the buffer, is then also coordinated with the aforementioned speeds of the other process steps.

[0049] In the above process, in the case of filling two or more tires with the produced sealant, a simultaneous intermediate step d1) takes place in which a defined (depending on the required amount of sealant per tire and the speeds of the other process steps) partial quantity of component A is temporarily stored in the intermediate storage.

[0050] Subsequently, the partial quantity A is then removed from the intermediate storage in a further intermediate step d2), whereby a constant quantity ratio of A to B is achieved in the second mixing device without tire sealant being undesirably released from the device when the tire is changed.

[0051] All of the above statements apply to the cache.

[0052] Expressions such as “filling a tire with the sealant” and “applying the sealant to a surface of a tire” refer to the same process step in the context of the present invention and are therefore synonymous.

[0053] The process steps and components of the tire sealant are explained below.

[0054] According to the invention, in process step a) a masterbatch is first provided which contains at least one rubber and at least one filler.

[0055] The rubber can be any type of rubber known to those skilled in the art. A mixture of different rubbers is also conceivable.

[0056] According to a preferred embodiment of the invention, the rubber in process step a) is natural rubber (NR) and / or butadiene rubber (BR) and / or isoprene rubber (IR) and / or styrene-butadiene rubber (SBR) and / or polychloroprene (CR) and / or butyl rubber (IIR) and / or bromobutyl rubber (BIIR) and / or chlorobutyl rubber (CIIR).

[0057] These rubber types are particularly well-suited for the processing temperatures required during the production of the tire sealant and later during application in the tire. Particular preference is given to using at least butyl rubber (IIR) in process step a). Butyl rubber is particularly suitable because it has a comparatively high airtightness.

[0058] The filler can be any filler known to those skilled in the art, such as, in particular, carbon black and / or silica. According to a preferred embodiment of the invention, the filler in process step a) comprises at least one carbon black. This has the advantage of increasing the cohesion of the sealant and reducing its stickiness during the manufacturing process. At the same time, the sealant's stability and tear properties are improved.

[0059] This may be any type of carbon black known to the person skilled in the art, such as in particular and preferably a carbon black of type N326.

[0060] In process step a), further components of the masterbatch can be added, such as preferably a crosslinker, as well as further components such as processing aids, in particular tackifiers such as alkyl or phenolic resins, and / or at least one plasticizer, such as an oil, and optionally further additives, such as color pigments.

[0061] The oil can be any oil known to the person skilled in the art, such as, in particular, aromatic, naphthenic, or paraffinic mineral oil plasticizers. When using mineral oil, it is preferably selected from the group consisting of DAE (Distilled Aromatic Extracts), RAE (Residual Aromatic Extract), TDAE (Treated Distilled Aromatic Extracts), MES (Mild Extracted Solvents), and naphthenic oils.

[0062] The provision of the masterbatch in process step a) can preferably be carried out by mixing the said components in one or more mixing stages, wherein the production of the masterbatch takes place outside the device according to the invention.

[0063] In particular, by combining the addition of a crosslinker during the production of component A with the addition of a crosslinking initiator in component B, a particularly effective tire sealant is obtained that seals quickly in the event of a puncture. The sealant is thus preferably based on the crosslinking of a rubber with a crosslinker. It is clear to those skilled in the art that the aforementioned components are present in the crosslinked sealant at least partially in chemically modified form, in particular as derivatives.

[0064] According to a preferred embodiment of the invention, the crosslinker is selected from the group comprising, particularly preferably consisting of, polymethylol resin and divinylbenzene and quinones. The quinone is preferably a quinone dioxime, for example dibenzoylquinone dioxime or para-benzoquinone dioxime. Para-benzoquinone dioxime is particularly preferred.

[0065] According to process step b), the provided masterbatch is introduced through the first inlet opening into the first mixing device, which can be operated continuously and, as stated above, is preferably self-conveying and very particularly preferably a twin-screw extruder, and wherein all of the above statements apply.

[0066] The first inlet opening is designed so that the comparatively high-viscosity masterbatch containing rubber and filler can pass through.

[0067] According to process step c), at least one low-viscosity liquid with a dynamic shear viscosity at 100°C in the range of 1 mPas to 10 Pas is introduced into the first mixing device, in particular through at least one third inlet opening. However, the low-viscosity liquid can, in principle, also be introduced into the first mixing device through the first inlet opening, optionally together with the masterbatch. If introduced through a separate, at least one third, inlet opening, this is preferably designed to be particularly suitable for low-viscosity liquids.

[0068] According to a preferred embodiment of the invention, the low-viscosity liquid has a dynamic shear viscosity at 100 °C of 20 to 1000 mPas.

[0069] The low-viscosity liquid preferably contains at least one polyolefin, more preferably at least one polybutene. This determines the tackiness of the finished sealant and determines the flowability of component A in the production process, as well as the local stability of the finished sealant. Preference is given to at least one polybutene with a number-average molecular weight distribution Mn according to GPC of 200 to 2500, more preferably 800 to 2500 g / mol, particularly preferably 1200 to 1600 g / mol, again particularly preferably 1200 to 1400 g / mol, in particular, for example, 1300 g / mol.

[0070] A polybutene with such a molecular weight distribution Mn preferably has a dynamic shear viscosity at 100 °C of 20 to 1000 mPas and is particularly preferred due to its flow behavior in combination with the other properties.

[0071] The masterbatch provided in step a) is mixed in process step d) with the at least one low-viscosity liquid having a dynamic shear viscosity in the range from 1 mPas to 10 Pas, thereby producing component A. For the purposes of the present invention, "low-viscosity" (also "low viscosity") is understood to mean a dynamic shear viscosity in the range from 1 mPas to 10 Pas.

[0072] In both cases, the dynamic shear viscosities given apply to a shear rate of 1 s -1 measured at 100 °C. The measurement of shear viscosity in the range of low-viscosity liquids is carried out using commercially available shear disk rheometers, in particular plate-on-plate rheometers, for example, the Haake Rheostress 6000 model.

[0073] The unit "Pas" stands for Pascal-second (Pascal times second) and is familiar to experts. The unit "mPas" stands for millipascal-second.

[0074] The masterbatch prepared in process step a), on the other hand, is obtained as a highly viscous masterbatch with a dynamic shear viscosity in the range of 5000 Pas to 140000 Pas. Here, the shear viscosity is measured using commercially available high-pressure capillary rheometers in the range of high-viscosity liquids.

[0075] In addition, in process step c) at least one oil, preferably at least one of the above-mentioned oils, such as in particular and for example a paraffinic oil, can be added.

[0076] As described above, the method in quasi-continuous operation when filling two or more pneumatic vehicle tires also comprises steps d1) and d2), wherein a partial quantity of component A is discontinuously stored in the described intermediate storage and removed therefrom.

[0077] In single operation, ie for filling only one tire with sealant, intermediate storage of component A is not necessary.

[0078] According to step e), the produced component A is conveyed further into the second mixing device by means of the pumping device. When filling a plurality of tires, this preferably also occurs discontinuously as described. The pumping device, preferably a gear pump, conveys a correspondingly adjusted amount of component A at a speed adapted to the overall process.

[0079] According to step f), a component B of the tire sealant to be produced is introduced into the second mixing device through the second inlet opening.

[0080] In quasi-continuous operation of the device, i.e. when filling two or more pneumatic vehicle tires, this is preferably done discontinuously, particularly preferably as described above via a diaphragm metering pump.

[0081] The quantity of component B fed in is adjusted to the quantity of component A transported and dosed accordingly.

[0082] Component B contains at least one crosslinking initiator. The crosslinking initiator is a chemical compound that initiates the crosslinking of the sealant. The crosslinking initiator can, for example and preferably, be lead oxide or other metal oxides or a peroxide compound.

[0083] A peroxide compound is a chemical compound that contains at least one peroxide unit, i.e., -OO- (where O = oxygen). Multiple peroxides can also be used. The peroxide(s) are preferably selected from the group consisting of diaroyl peroxides, diacyl peroxides, and peroxy esters.

[0084] According to a preferred embodiment of the invention, component B, before mixing with component A, also contains a low-viscosity liquid having a dynamic shear viscosity in the range from 1 mPas to 10 Pas, the above-mentioned information on measuring the dynamic shear viscosity and the nature of the low-viscosity liquid also applying here.

[0085] In particular, the low-viscosity liquid which may be contained in component B preferably also comprises a polyolefin, preferably at least one polybutene.

[0086] Preference is given to at least one polybutene having a number average molecular weight distribution Mn according to GPC of 200 to 2500 g / mol, particularly preferably 200 to 1600 g / mol, again particularly preferably 400 to 1000 g / mol.

[0087] Finally, according to step g), components A and B are mixed to produce the tire sealant.

[0088] For example, and preferably, components A and B are mixed together in a ratio of 10 to 1.

[0089] The produced tire sealant is conveyed out of the device through the outlet according to step h). The outlet preferably comprises a nozzle.

[0090] According to step i), the discharged sealant is applied to at least one inner surface of a pneumatic vehicle tire.

[0091] As described above, the device and method according to the invention are designed so that two or more tires can be filled with the sealant without any sealant being lost during tire changes. The flow from the outlet is then stopped accordingly during tire changes.

[0092] The amount of tire sealant required per cycle, i.e. per tire, depends on the density of the tire sealant as well as the respective tire type and its size or diameter.

[0093] inner surface and the thickness of the sealant to be applied.

[0094] For example, a cycle time of 30 to 50 seconds results in a material flow of 1.5 to 3 kg / min.

[0095] Particularly preferably, the pneumatic vehicle tire is rotated and moved in the axial direction in step i). This ensures that the tire sealant is applied evenly and reproducibly to the pneumatic vehicle tire.

[0096] In the following, the device according to the invention and the method according to the invention will be described with reference to an embodiment which is shown in Fig. 1 is schematically outlined.

[0097] The device 10 is shown in such a way that the material flow runs from right to left to a pneumatic vehicle tire 8. In Fig. Figure 1 shows a twin-screw extruder as the first mixing device 1, schematically shown from the side, so that only one of the two screws is shown in this view. The first mixing device 1 has a first inlet opening 2 through which, for example, a comparatively high-viscosity masterbatch containing butyl rubber, carbon black, and a crosslinker is introduced.

[0098] In Fig. 1 shows additional inlet openings 3 through which a low-viscosity liquid, in particular polybutene and / or an oil, can be introduced into the first mixing device 1. In the twin-screw extruder, the masterbatch and the low-viscosity liquid are mixed together to form component A of the tire sealant.

[0099] The first mixing device 1 is also connected to an intermediate storage device 9, for example a piston accumulator, which can receive and release material, i.e. component A.

[0100] Furthermore, Fig. 1 shows a gear pump as an example of a pumping device 4 with schematically illustrated gears 4a, which transports the manufactured component A.

[0101] A second mixing device 5, which comprises, for example, a static mixing element, is connected to the pump device 4. Through a second inlet opening 6, further material, in particular a component B of a tire sealant comprising at least one crosslinking initiator and optionally a low-viscosity liquid, can be introduced into the second mixing device 5. This is preferably done by means of a diaphragm metering pump (in Fig. 1 not shown).

[0102] In the second mixing device 5, components A and B are mixed together in a ratio of 10 to 1.

[0103] The sealant thus produced is applied through an outlet 7 onto the inner surface 8a of a pneumatic vehicle tire 8.

[0104] The tire is preferably rotated along its rotational axis and preferably moved in the axial direction aR, if necessary back and forth, so that the sealant is applied spirally and evenly to the inner surface.

[0105] For example, 1 to 2 kg of sealant are applied to a tire 8 or the tire is filled with 1 to 2 kg of sealant.

[0106] When switching to the next tire to be filled, the material flow is stopped at outlet 7. Component A is produced continuously using the buffer 9. The process is thus quasi-continuous. List of reference symbols 1 First mixing device 2 inlet opening 3 Additional inlet opening 4 Pumping device 4a gear 5 Second mixing device 6 Inlet opening 7 Outlet 8 pneumatic vehicle tires 8a Inner surface of a pneumatic vehicle tire 9 Cache 10 Device

Claims

[1] Device (10) for producing a tire sealant and applying the tire sealant to pneumatic vehicle tires (8), wherein the device (10) comprises at least the following components: - A first mixing device (1) having a first inlet opening (2), wherein the first mixing device (1) can be operated continuously; - an intermediate storage device (9) connected to the first mixing device (1); - A pumping device (4) suitable for conveying the mixed material mixed in the first mixing device (1); - A second mixing device (5) with at least one second inlet opening (6); - An outlet (7) through which a tire sealant can leave the device (10) and be applied to vehicle pneumatic tires (8); - wherein the components can be connected to one another in such a way that a continuous material flow from the first mixing device (1) to the outlet (7) is possible. [2] Device (10) according to claim 1, characterized by that the first mixing device (1) is self-propelling. [3] Device (10) according to claim 2, characterized by that the first mixing device (1) is a twin-screw extruder. [4] Device (10) according to claim 3, characterized by that the twin-screw extruder has a length of 1 to 2.5 m, with each screw having a diameter of 20 to 40 mm. [5] Device (10) according to one of the preceding claims, characterized by that the intermediate storage (9) has a volume of 1 to 10 liters. [6] Device (10) according to one of the preceding claims, characterized by that the pumping device (4) is a gear pump. [7] Device (10) according to one of the preceding claims, characterized byin that it comprises a holding device for pneumatic vehicle tires (8), which is also preferably suitable for rotating a pneumatic vehicle tire (8). [8] Method for producing a tire sealant and applying it to pneumatic vehicle tires (8) in a device (10) according to one of claims 1 to 7, wherein the method comprises at least the following method steps: a) providing at least one masterbatch containing at least one rubber and at least one filler; b) introducing the masterbatch through the first inlet opening (2) into the first mixing device (1); c) introducing at least one low-viscosity liquid having a dynamic shear viscosity at 100 °C in the range from 1 mPas to 10 Pas into the first mixing device (1), in particular through at least one third inlet opening (3); d) mixing the masterbatch with the low-viscosity liquid to produce component A; e) conveying component A into the second mixing device (5) by means of the pumping device (4); f) introducing a component B containing at least one crosslinking initiator through the second inlet opening (6) into the second mixing device (5); g) mixing component A with component B in the second mixing device (5) to produce the tire sealant; h) Outlet of the tyre sealant through the outlet (7) and i) applying the tire sealant to at least one inner surface (8a) of pneumatic vehicle tires (8). [9] Method according to claim 8, characterized by that it is carried out in quasi-continuous operation of the device (10) and thus the tire sealant is applied successively to several pneumatic vehicle tires (8). [10] Method according to one of claims 8 or 9, characterized bythat the pneumatic vehicle tire (8) rotates in step i) and is moved in the axial direction (aR).

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