• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Squeegee rubber production using supercritical fluid. The present invention relates to a method for producing a wiper rubber (10), in particular for a windshield wiper, in which a wiper rubber profile (1) is provided in a process step a), which has a wiper lip section (2) and a fastening section (4). In order to improve the wiping quality of the wiper rubber (10) and to increase the wear resistance of the wiper rubber (10), particles (5) suspended in a supercritical fluid are applied to at least a partial area (2c, 2c ') of the wiper rubber profile in a process step b) (1) sprayed on. The present invention also relates to a correspondingly manufactured wiper rubber (10) and a windshield wiper equipped therewith.
    公开号:BE1021284B1
    申请号:E2013/0196
    申请日:2013-03-26
    公开日:2015-10-20
    发明作者:Bart Clerx；Reiner Lay
    申请人:Robert Bosch Gmbh；
    IPC主号:
    专利说明:

    The present invention relates to a method for producing a wiper blade rubber, a correspondingly serged wiper blade rubber and a windshield wiper equipped therewith.
    State of the art
    Wiper blades for windshield wipers are usually designed to adapt to the contour of a glass pane of a vehicle and to remain flexible at different temperatures.
    However, compared to other materials, such as glass or plastic, elastomers have high coefficients of sliding friction, which can cause noise during wiping and wiping rubber wears quickly.
    The document US 2003/0222017 describes a method in which a substance dissolved in a supercritical fluid. a substrate is applied.
    The document DE 42 02 320 A1 describes a method for impregnating a substrate, in which an impregnating agent is taken up in a fluid and the substrate is then brought into contact with the fluid for a certain time.
    Disclosure of the invention
    The subject matter of the present invention is a method for producing a wiper blade rubber, in particular for a (vehicle) windscreen wiper, comprising the method steps: a) providing a squeegee profile which comprises a wiper lip section and a fastening section; and b) spraying particles suspended in a supercritical fluid onto at least a portion of the squeegee profile.
    The fact that the particles are sprayed suspended in the supercritical fluid, a uniform distribution of the particles on the squeegee profile causes and agglomeration of the particles can be advantageously avoided. In this way, in turn, the wiping quality of the wiper blade can be improved. In addition, the spraying of particles in a supercritical fluid can cause the particles. can penetrate deeper into the material when hitting the squeegee profile. An increase in the penetration depth in turn has the advantage that the particles. more firmly connected to the squeegee profile and thus the wear resistance of the wiper blade can be increased. In addition, supercritical fluids, such as supercritical carbon dioxide, advantageously evaporate without residue. The further processing of the squeegee profile or the operation of the squeegee is therefore advantageously not influenced by the fluid.
    The at least one subregion of the wiper rubber professional may in particular be at least one subregion of the wiper lip section of the wiper rubber profile. For example, in method step b) particles can be sprayed onto at least one subregion of the wiper lip section of the wiper rubber profile. In particular, in method step b), particles can be applied to the subregions of the side surfaces of the wiper lip section of the squeegee rubber profile adjacent to the wiping edges.
    In a preferred embodiment, in step b), the particles are sprayed on in such a way that in each case a part of the particles in each case penetrates into the material of the squeegee profile, the other part of the particles protruding from the material of the squeegee profile. On the one hand, this means that the particles can be especially firmly connected to the squeegee profile. On the other hand, the fact that the particles protrude from the material of the squeegee profile makes it possible to effect a lotus effect and thereby to provide the subregion of the squeegee with hydrophobic properties in order to improve the wiping behavior and wiping quality of the wiper blade.
    Within the scope of a preferred embodiment, the particles are sprayed on in method step b) in such a way that the particles essentially form a monolayer. Thus, the squeegee profile can be provided with a particularly uniform surface functionalization. After the formation of the particle monolayer, process step b) or the spraying of the particles is preferably terminated. A monolayer also has a positive effect on effecting a lotus effect or lotus-like water repellent effect. The particles are preferably arranged substantially at a distance from each other. The average distance between the particles may be in particular in a range from 1 pm to 100 pm, for example from 1 pm to 50 pm. In order to achieve a lotus effect or a lotus-like water-repellent effect, it has proved to be advantageous to choose the average distance between the particles such that it lies in a range of 5 5 μm to 50 50 μm.
    In essence, it may be understood in particular that most of the particles, for example more than 80% of the particles, fulfill the respective prevailing conditions.
    As supercritical fluid, basically any supercritical fluid can be used in which particles can be suspended. Preferably, a supercritical fluid is used which evaporates, for example at room temperature and atmospheric pressure, in particular without residue. For example, the fluid may be selected from the group consisting of carbon dioxide, noble gases such as argon and / or xenon, alkanes such as ethane, methane, propane and / or butane, nitrous oxide and mixtures thereof.
    In a preferred embodiment, the supercritical fluid is supercritical carbon dioxide. Carbon dioxide is advantageously inexpensive, easy to handle and evaporates without residue at room temperature and atmospheric pressure.
    Within the scope of a further preferred embodiment, the particles comprise polymer particles, in particular thermoplastic polymer particles, and / or friction-reducing particles. In particular, the particles may be polymer particles, in particular thermoplastic polymer particles, and / or friction-reducing particles.
    Polymer particles may advantageously undergo physical and / or chemical bonding with the squeegee profile. For example, the particles may include ultrahigh molecular weight polyethylene (UHMW-PE) particles, high density polyethylene (HDPE) particles, low density polyethylene (LD-PE) particles,
    Particles of isotactic polypropylene (PP), polyamide particles (PA), polytetrafluoroethylene particles (PTFE) or a mixture thereof include or be. In particular, the particles may be polyolefin particles, for example crystalline polyolefin particles, in particular ultrahigh molecular weight polyethylene (UHMW-PE) particles. For example, particles of ultra-high molecular weight polyethylene (UHMW-PE) marketed under the trade name MIPELON by Mitsui Chemicals can be used.
    However, the particles can also comprise or be friction-reducing particles, for example inorganic friction-reducing particles, for example soot particles, graphite particles, molybdenum disulfide particles and / or silicate particles.
    In a preferred embodiment of this embodiment, the particles comprise ultrahigh molecular weight polyethylene particles. In particular, the particles may be ultrahigh molecular weight polyethylene particles. Because of their low coefficient of friction with respect to glass and their very good abrasion resistance or cohesion, particles of ultrahigh molecular weight polyethylene have proven to be particularly advantageous for wiper wiper rubbers.
    Within the scope of a further preferred embodiment, the particles have an average particle size in a range of from 5 pm to 100 pm, for example from 5 pm to 50 pm, for example from 5 pm to 20 pm. Preferably, the process parameters in method step b), in particular the parameters determining the penetration depth or the momentum of the particles, and the average particle size of the particles are coordinated such that in each case a part of the particles penetrates into the material of the squeegee profile, wherein the other Part of the particles of the material of the squeegee profile, in particular by> 5 μη to ^ 20 gm, protrudes. To achieve a lotus effect, it has proven to be advantageous if the particles protrude by ^ 5 gm to ^ 20 gm from the material of the squeegee profile.
    Within the scope of a further preferred embodiment, in process step b) the particles are sprayed on by means of a powder coating process. In this case, the particles suspended in the supercritical fluid can be applied, in particular by one or more special spraying devices, to the surface of the squeegee profile, for example to regions of the squeegee profile facing one another. The particles can be sprayed onto a vulcanized, partially vulcanized or unvulcanized wiper rubber profile. Preferably, the particles are sprayed in step b) on an unvulcanized or at least only partially vulcanized squeegee profile. Accordingly, an unvulcanized or at least only partially vulcanized squeegee profile is preferably provided in method step a). Such a squeegee profile can then be vulcanized in a later explained in step c) or at least vulcanized.
    Due to the good adhesive properties of the squeegee profile in the unvulcanized or partially vulcanized state, electrostatic charging of the particles is not absolutely necessary.
    Within the scope of one embodiment, the particles are therefore not electrostatically charged in method step b). So can advantageously electrical
    Energy saved and thus the process costs are reduced.
    In the context of another embodiment, the particles are therefore electrostatically charged in process step b). In the case of an electrostatic charging, the particles are preferably equally charged so that they repel each other, whereby a particularly uniform application of the particles to the surface of the squeegee profile can be achieved and undesired particle agglomeration during spraying can be prevented. In particular, a particle monolayer can thus be formed on the wiper rubber surface, and a stacking or accumulation of particles otherwise negatively influencing the wiping quality can be avoided.
    In this case, the particles can be charged in particular negatively. The squeegee profile can be positively charged or grounded. Thus, it can advantageously be achieved that the negatively charged particles strike the positively charged wiper rubber profile at a higher speed. As a result, in turn, advantageously, the penetration depth of the particles in the material of the squeegee profile can be increased and their adhesion can be improved.
    Process step b) may in particular be followed by a heat treatment in order to achieve permanent adhesion of the particles to the squeegee profile.
    Within the scope of a further preferred embodiment, the method therefore further comprises process step c): heating, in particular vulcanization, of at least the at least one subregion of the wiper rubber profile. By the subsequent heating in process step c), in particular the physical connection between the wiper rubber profile and the particles or coating can be intensified and optionally additionally a chemical bond can be formed between the material of the wiper rubber profile and the material of the particles. It is particularly possible in process step c) to heat the entire squeegee profile.
    The vulcanization can be carried out in particular by means of a heat treatment medium, for example by means of a liquid salt bath. The liquid salt bath may, for example, be a melt containing, for example, a mixture of potassium nitrate and / or sodium nitrate and / or sodium nitrite and / or lithium nitrite. The vulcanization can be carried out, for example, at a temperature in a temperature range of> 150 ° C to ^ 300 ° C.
    Within the scope of one embodiment of this embodiment, in method step c), the at least one subregion of the squeegee profile is (only) heated in such a way that the particles essentially retain their shape. Thus it can be ensured that the particles become a lotus effect contribute, by which the wiping behavior and the wiping quality of the wiper blade can be improved. The by process step b). caused uniform distribution of the particles on the surface of the squeegee profile and the resulting solid bond between the particles and the squeegee profile, thereby having an advantageous effect on the wear resistance of the lotus effect. 1. Within the scope of another embodiment of this embodiment, in method step c) the at least one subregion of the squeegee profile is heated, however, such that the particles fuse together to form a substantially continuous layer. Thus, advantageously, for example, a friction-reducing, coating can be realized. A uniform distribution of the particles on the surface of the squeegee profile and a firm bond between the particles and the squeegee profile also has an advantageous effect on the wear resistance, the wiping behavior and the wiping quality of the squeegee in the context of this embodiment.
    The squeegee profile may in particular comprise or be formed from at least one elastomeric material. For example, the elastomeric material may be selected from the group consisting of ethylene-propylene-diene monomer rubber (EPDM), ethylene-propylene-monomer rubber (EPM), chloroprene rubber (CR), natural rubber (NR), polyurethane. Rubber and combinations thereof. In particular, the squeegee profile may be polyolefin-based.
    Within the scope of a further preferred embodiment, in method step b) particles are sprayed onto at least one subregion of the wiper lip section of the wiper rubber profile. In particular, in method step b), particles can be sprayed onto subregions of the side surfaces of the wiper lip section of the squeegee profile that are adjacent to the wiping edges.
    The squeegee profile can be provided, for example, by extrusion or injection molding. In this case, the wiper rubber profile in process step a) can be extruded in particular or be provided by extrusion.
    The squeegee Pr.ofil may in particular be a double squeegee rubber whose cross-sectional area corresponds to the cross-sectional area of two squeegee rubbers, which are connected to one another via the two wiper lip sections. The squeegee double profile can be designed in particular in the form of a strand, for example an extrusion strand.
    The method may further comprise the step of: e): separating the squeegee double profile into individual squeegees. The squeegee double profile can be separated, for example, in particular horizontally, between the two wiper lip sections. Inasmuch as the squeegee double profile is designed in the form of a strand, the strand can also be separated, in particular several times, perpendicular to the longitudinal extent of the squeegee string, for example in order to produce a large number of squeegees.
    With regard to further technical features and advantages of the method according to the invention, reference is hereby explicitly made to the explanations in connection with the squeegee and wiper according to the invention and with the figures.
    Further objects of the present invention are a squeegee made by a method according to the invention and a windshield wiper comprising such a squeegee.
    With regard to further technical features and advantages of the wiper rubber and windscreen wiper according to the invention, reference is hereby explicitly made to the explanations in connection with the method according to the invention and with the figures.
    drawings
    Further advantages and advantageous embodiments of the objects according to the invention are illustrated by the drawings and explained in the following description. It should be noted that the drawings have only descriptive character and are not intended to limit the invention in any way. Show it
    1 shows a schematic cross section through an embodiment of a wiper rubber produced according to the invention; and
    Fig. 2 is a schematic greatly enlarged
    Cross section through the wiper lip portion of an embodiment of the wiper blade shown in Figure 1;
    Fig. 3 is a schematic greatly enlarged
    Cross section through the wiper lip portion of another embodiment of the wiper blade shown in Fig. 1.
    1 shows a schematic cross section through an embodiment of a wiper rubber 10 produced according to the invention. FIG. 1 illustrates that the squeegee 10 comprises a squeegee base body 1 which has a wiper lip section 2 which is connected to a fastening section 4 via a tilting web section 3. FIG. 1 illustrates that the wiper lip section 2 has two wiping edges 2a, 2a ', between which an end face 2b is formed and to the 2a, 2a' in each case a side face. 2c, 2c 'adjacent. In addition to the two wiping edges 2a, 2a 'of the wiper lip section 2, the subregions of the two side faces 2c, 2c', which adjoin the wiping edges 2a, 2a ', are involved in the wiping function of the wiper blade rubber 10. It has proven to be advantageous, in particular, to provide the side surfaces 2c, 2c 'of the wiper lip section 2 with a functional layer 5, for example a water-repellent or other, friction-friction-reducing layer 5.
    FIG. 1 illustrates that the partial regions of the side surfaces 2c, 2c 'of the wiper lip section 2 adjoining the wiping edges 2a, 2a' each have a functional layer 5 which is formed by particles 5 which have been sprayed in a supercritical fluid.
    The layer 5 may in particular be an open layer, in particular a monolayer of particles 5, in particular spaced apart from one another (see FIG. 2). By this embodiment, the surface of the squeegee profile 1 can advantageously be provided with a lotus effect. In addition, the material of the particles .5 can also have hydrophobic properties and / or serve as a lubricant.
    By means of a melting process, however, it is also possible to convert the open layer formed by particles 5 into a continuous layer 5, for example with friction-friction-reducing properties (see FIG. 3).
    Figure 2 is a schematic, greatly enlarged cross-section through the wiper lip portion 2 of the squeegee 10 shown in Figure 1, illustrating that the particles 5 so suspended in the supercritical fluid are sprayed onto a squeegee profile 1 that the particles 5 form a monolayer , wherein the particles 5 are spaced from each other and in each case a part 5a of the particles 5 penetrates into the material of the squeegee profile 1, wherein the other part 5b of the particles 5 protrudes from the material of the squeegee profile 1.
    In order to achieve a lotus effect, the squeegee profile 1 is in one embodiment after the spraying of the particles 5 at most heated, in particular vulcanized that the particles 5 substantially retain their shape and, thus substantially the one shown in Figure 2 Configuration is maintained. This can be achieved either by using heat-insensitive particles 5 or insofar as heat-sensitive particles 5, for example thermoplastic polymer particles, are used, the temperature being set such that the particles 5 soften but do not melt.
    To convert the open layer of particles 5 shown in Figure 2 in a continuous layer shown in Figure 3, for example, with friction friction reducing properties, the squeegee profile 1 is heated in an embodiment after spraying the particles 5 in such a way, in particular vulcanized the particles 5 melt together to form a substantially continuous, thin coating 5. FIG. 3 shows that the thin coating 5 not only covers the surface of the squeegee profile 1, but also fills depressions 5 formed during the spraying of the particles suspended in the supercritical fluid, resulting in a particularly stable and stable bond between the squeegee profile 1 and the coating 5 results.
    权利要求:
    Claims (15)
    [1]
    claims
    1. A method for producing a wiper blade rubber (10), in particular for a windscreen wiper, comprising the method steps: a) providing a squeegee profile (1) with a wiper lip section (2) and a fastening section (4); and b) spraying particles (5) suspended in a supercritical fluid onto at least one subregion (2c, 2c ') of the squeegee profile (1).
    [2]
    2. The method of claim 1, wherein in step b) the particles (5) are sprayed such that substantially each one part (5a) of the particles (5) penetrates into the material of the squeegee profile (1), wherein the other Part (5b) of the particles (5), in particular by ^ 5 p to ^ 20 pm, protrudes from the material of the squeegee profile (1).
    [3]
    3. The method of claim 1 or 2, wherein in step b) the particles (5) are sprayed such that the particles (5) form substantially a monolayer, in particular wherein the particles (5) are substantially spaced from one another.
    [4]
    4. The method of claim 3, wherein the average distance between the particles (5) in a range of ^ 1 pm to ^ 100 pm, in particular from ^ 5 pm to ^ 50 pm, is located.
    [5]
    5. The method according to any one of claims 1 to 4, wherein the supercritical fluid is supercritical carbon dioxide.
    [6]
    6. The method according to any one of claims 1 to 5, wherein the particles (5) comprise polymer particles, in particular thermoplastic polymer particles, and / or friction-reducing particles.
    [7]
    A method according to any one of claims 1 to 6, wherein the particles (5) comprise ultrahigh molecular weight polyethylene particles.
    [8]
    8. The method according to any one of claims 1 to 7, wherein the particles (5) have an average particle size in a range of ^ 5 pm to ^ 100 pm.
    [9]
    9. The method according to any one of claims 1 to 8, wherein in step b) the particles (5) are sprayed by means of a powder coating process.
    [10]
    10. The method according to any one of claims 1 to 9, wherein in step b) the particles (5) are sprayed onto an unvulcanized or at least only partially vulcanized squeegee profile (1).
    [11]
    11. The method according to any one of claims 1 to 10, wherein the method further comprises the step of: c) heating at least the at least one portion (2c, 2c ') of the squeegee profile (1), in particular wherein the squeegee profile (1 ) vulcanized or at least vulcanized.
    [12]
    12. The method according to claim 11, wherein in method step c) the at least one subregion (2c, 2c ') of the squeegee profile (1) is heated in such a way that the particles (5) essentially retain their shape.
    [13]
    13. The method according to one of claims 1 to 11, wherein in method step b) particles (5) on at least a portion of the wiper lip portion (2) of the squeegee profile (1), in particular on the wiper edges (2a, 2a ') adjacent portions the side surfaces (2c, 2c ') of the wiper lip portion (2) of the squeegee profile (1) are sprayed.
    [14]
    14. squeegee made by a method according to any one of claims 1 to 13.
    [15]
    15. A windscreen wiper comprising a squeegee according to claim 14.
    类似技术:
    公开号 | 公开日 | 专利标题
    EP2332792B1|2016-07-13|Wiper blade rubber and production method
    EP2398680B1|2015-04-08|Wiper blade for a window wiper and method for the production of said wiper blade
    EP1561656A2|2005-08-10|Wiper blade and a method for the manufacturing thereof
    EP2398848B1|2019-12-04|Process for producing elastomeric linear profile
    BE1021284B1|2015-10-20|WIPER RUBBER PRODUCTION BY MERGER CRUCIBLE FLUID
    EP1522472B1|2014-06-11|Wiper blade
    DE102005000851A1|2005-08-25|Window wiper blade for a vehicle has a rubber wiper lip onto which polymer film or granulate is applied
    WO2009130081A1|2009-10-29|Method for the production of extrudates, extruded profiled element, and use thereof as a squeegee
    DE102009003095A1|2010-11-18|Wiper blade manufacturing method for windscreen wipers of motor vehicle, involves structuring area of strand profile at surface with laser after vulcanizing elastomer material to produce nano structure
    DE102014102125A1|2015-08-20|Hybrid metal-plastic composite for a sliding bearing and method for its production
    BE1020734A3|2014-04-01|WIPER RUBBER PRODUCTION BY TISSUE RIBBON.
    BE1021337B1|2015-11-04|MESH PRODUCTION BY MICROVERTING
    EP2025707B1|2012-02-01|Cable extrudate and method for its manufacture and application
    EP2825584A1|2015-01-21|Epdm wiper rubber
    DE102016222380A1|2018-05-17|Wiper strip and method for producing the same
    BE1021615B1|2015-12-18|SURFACE WIPER WITH SURFACE STRUCTURING AND HIGH HYDROPHOBIC LAYER
    DE102019200001A1|2020-07-02|Process for producing a squeegee with a combination layer consisting of a particle layer and a friction-reducing material
    DE102013203194A1|2014-08-28|Dispersion-coated squeegee
    DE102013201093B4|2020-10-22|Squeegee rubber with replacement notice
    EP2440606B1|2015-06-24|Method for coating an extruded section
    DE102016216257A1|2018-03-01|Wiper blade for wiper blades of windscreen wipers, methods and tools for its manufacture
    DE3529774A1|1987-02-26|Sealing element
    WO2021016647A1|2021-02-04|Method for producing a continuous belt
    DE102012200628A1|2013-07-18|Wiper blade with renewable wiper edge
    DE102009003234A1|2010-11-25|Producing a wiper rubber, useful for a windscreen wiper of a motor vehicle, comprises applying a particle to a wiper rubber base body, where the particle exhibits a particle core and a particle core coating
    同族专利:
    公开号 | 公开日
    FR2988354A1|2013-09-27|
    FR2988354B1|2017-06-23|
    DE102012204749A1|2013-09-26|
    MX2013003366A|2013-09-25|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE4202320A1|1992-01-29|1993-08-05|Dierk Dr Knittel|Impregnating substrate by contact with supercritical fluid contg. impregnant - followed by conversion of fluid to subcritical state|
    WO2002094624A1|2001-05-23|2002-11-28|Robert Bosch Gmbh|Wiper blade|
    US20030222017A1|2002-05-28|2003-12-04|Battelle Memorial Institute|Electrostatic deposition of particles generated from rapid expansion of supercritical fluid solutions|
    DE102007012924A1|2007-03-19|2008-09-25|Robert Bosch Gmbh|Wiper rubber and process for its preparation|
    DE102007050120A1|2007-10-19|2009-04-23|Robert Bosch Gmbh|Strand-shaped profile and method for coating a strand-like profile|
    DE102008000928A1|2008-04-02|2009-10-08|Robert Bosch Gmbh|Coating for elastomeric strand-shaped profiles, in particular windscreen wiper blades, and process for their preparation|
    DE102008040875A1|2008-07-31|2010-02-04|Robert Bosch Gmbh|Extruded profile made of elastomer material for wiper rubber, comprises a base section and a lip section, which has a surface layer made of a material with slight frictional coefficient and a high wear stability|DE102017210906A1|2017-06-28|2019-01-03|Robert Bosch Gmbh|Windscreen wiper rubber with optimized coating layer thickness|
    DE102019200001A1|2019-01-02|2020-07-02|Robert Bosch Gmbh|Process for producing a squeegee with a combination layer consisting of a particle layer and a friction-reducing material|
    法律状态:
    2020-12-23| MM| Lapsed because of non-payment of the annual fee|Effective date: 20200331 |
    优先权:
    申请号 | 申请日 | 专利标题
    DE102012204|2012-03-26|
    DE201210204749|DE102012204749A1|2012-03-26|2012-03-26|Manufacturing a wiper rubber useful in windscreen wiper, comprises providing a wiper rubber-profile with wiper lip portion and fastening portion, and spraying particles suspended in supercritical fluid, on a portion of wiper rubber-profile|
    [返回顶部]