JP5414403B2 - Wiper blade - Google Patents

Description

  The present invention relates to a wiper blade for wiping on a glass surface, and is a technique that is particularly effective when applied to a blade rubber provided on a wiper blade.

  Cars such as passenger cars, buses, trucks, etc. are operated by wiping off dirt, snow, insects, and muddy water splashed by vehicles traveling in front of the windshield such as windshield and rear windshield. A wiper blade is used to secure a person's view.

  In the past, the blade rubber provided on the wiper blade generally used only natural rubber (NR) as a rubber material. For example, in Patent Document 1, in order to prevent the blade rubber using NR from sticking to the windshield, a non-polar paint may be applied to the cut surface of the lip portion of the blade rubber subjected to halogen treatment or the like on the lip portion. Proposed.

  However, blending of NR with chloroprene rubber (CR) or butadiene rubber (BR) has come to be performed due to demands for reducing blade rubber noise and improving deterioration resistance due to viscoelastic properties. At present, instead of the blade rubber using only natural rubber as proposed in Patent Document 1, what is blended with the above-described CR or the like is generally used. Further, in the blade rubber, carbon black is very excellent in rubber reinforcement, and has an overwhelming track record as a rubber reinforcing material, thereby obtaining the required rubber strength.

  Here, when natural rubber or blend rubber is used, chlorine treatment or the like is often performed for surface modification, and therefore, a silicone rubber wiper blade is also used for the purpose of preventing this. For example, in Patent Document 2, for the purpose of preventing the formation of a siloxane film, the range of 0.5 mm or more of the edge portion in contact with the glass surface is 100 parts by weight of a silicone rubber composition comprising a silicone raw rubber and a filler. A wiper blade made of a mixture containing 0.5 to 20 parts by weight of a surfactant is proposed.

JP-A-9-136616 JP-A-11-139259

By the way, in recent years, demand for de-oiling resources has been rapidly increasing due to the reduction of CO ₂ emission to prevent global warming and the depletion of fossil fuels. Blade rubber materials are no exception, and there is a need to shift to petroleum-free resources and naturally derived materials.

However, CR and BR are derived from petroleum. In addition, ethylene-propylene-diene rubber (EPDM) has been used to improve durability, and the same applies to this. Furthermore, carbon black used as a rubber reinforcing material is also derived from petroleum. As described above, it is not preferable to use a large amount of petroleum-derived material as the blade rubber material while the global trend is progressing toward CO ₂ emission reduction and oil removal resources. In particular, CR is not only derived from petroleum but also contains a large amount of halogen (chlorine). Considering the environmental load in recent years, it is more preferable to use a large amount of halogen.

  Here, as described in Patent Document 2, when silicone rubber is used, as described above, there is an adverse effect that is not obtained when natural rubber is used. To prevent this, a new additive is used. It becomes necessary. Further, since the silicone rubber is also a synthetic rubber, it is inevitable that a cost is required for the synthesis, and the environmental load cannot be reduced sufficiently.

  Therefore, it has been desired to reduce the environmental load at a high level by using rubber polymer and reinforcing material as a natural material in the material constituting the blade rubber.

  The objective of this invention is providing the wiper blade which reduces the load given to an environment, ensuring a viscoelastic characteristic.

  The wiper blade of the present invention is a wiper blade for wiping on a glass surface, and has a blade rubber including natural rubber, epoxidized natural rubber, and a mineral-based reinforcing material.

  The wiper blade of the present invention is characterized in that the epoxidized natural rubber has a blending amount of 23% by weight or more with respect to the total with the natural rubber.

  The wiper blade of the present invention is characterized in that the epoxidized natural rubber has an epoxidation rate of 50%.

  The wiper blade of the present invention is characterized in that the mineral-based reinforcing material is silica.

  The wiper blade of the present invention is characterized in that the blade rubber is irradiated.

  In the present invention, the term “natural rubber” means natural rubber that has not been epoxidized.

  According to the present invention, the blade rubber of the wiper blade includes natural rubber, epoxidized natural rubber, and mineral-based reinforcing material. be able to. Thereby, the load given to an environment can be reduced, ensuring a viscoelastic characteristic.

It is a perspective view which shows the wiper blade which is one embodiment of this invention. It is sectional drawing which follows the AA line of FIG. (A), (b) is explanatory drawing which shows the detail of the holding | maintenance part shown in FIG. 1, respectively. (A)-(d) is a schematic procedure figure which shows roughly the procedure of the manufacturing method of a blade rubber. (A), (b) is explanatory drawing which shows the reaction form of an irradiation process, respectively. (A) is an enlarged view showing a state where the monomer is bonded only to the lip portion of FIG. 2, and (b) is an enlarged view showing a state where the monomer is bonded to the entire blade rubber of FIG. It is a graph which shows the correlation with the compounding quantity of epoxidized natural rubber with respect to natural rubber, and tan-delta.

  Hereinafter, embodiments of the present invention will be described in detail. FIG. 1 is a perspective view showing a wiper blade according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line AA of FIG. 1, and FIGS. 3 (a) and 3 (b) are diagrams. It is explanatory drawing which shows the detail of the holding | maintenance part shown in 1. FIG.

  As shown in FIG. 1, the wiper blade 11 is attached to the tip of a wiper arm 13 of a vehicle 12, and when the wiper arm 13 swings by driving a wiper motor (not shown), the wiper blade 11 swings together with the wiper arm 13 and windshield glass 14 ( Hereinafter, the wind glass 14 is wiped off.

  The wiper blade 11 has a blade rubber 15 that directly contacts the surface of the wind glass 14 and a rubber holder 16 that holds the blade rubber 15. A pair of covers 17 are provided on both sides of the rubber holder 16 in the longitudinal direction. It has been.

  As shown in FIG. 2, the blade rubber 15 is formed in a rod shape having a substantially uniform cross section in the longitudinal direction, which includes a head portion 21 having a rectangular cross section, a lip portion 22, and a neck portion 23. It contacts the surface of the wind glass 14. The neck portion 23 is formed with a narrow width in the wiping direction with respect to the head portion 21 and the lip portion 22, whereby the lip portion 22 is coupled to the head portion 21 so as to be tiltable in the wiping direction.

  Between the head portion 21 and the neck portion 23, there are formed holding grooves 24 that open on both side surfaces in the wiping direction and extend in the longitudinal direction, and mounting grooves 21a are formed in the longitudinal direction on both side surfaces of the head portion 21, respectively. It is extended and formed. A leaf spring member 25 is mounted in each of the mounting grooves 21a.

  The plate spring member 25 is formed into a flat plate shape having a length similar to that of the blade rubber 15 by punching a plate material such as a steel plate, and is elastically deformable in a direction perpendicular to the wind glass 14. That is, the blade rubber 15 to which the leaf spring member 25 is attached is elastically deformable in a direction perpendicular to the window glass 14, that is, a direction in which the degree of curvature thereof is changed integrally with the leaf spring member 25. Further, in the natural state, the leaf spring member 25 is curved more strongly than the curvature of the window glass 14 in the elastically deformable direction, whereby the blade rubber 15 to which the leaf spring member 25 is attached is also bent. It is curved more strongly than the wind glass 14 in a state away from the window.

  In the illustrated case, the leaf spring member 25 is formed of a steel plate. However, the present invention is not limited to this. For example, the leaf spring member 25 may be elastically deformable in a direction perpendicular to the wind glass 14 such as a hard resin. That's fine.

  The rubber holder 16 is formed in a U-shaped cross section including a top wall portion 16a extending in the longitudinal direction by a resin material and a pair of side wall portions 16b extending from both side portions of the top wall portion 16a toward the wind glass 14, The length of the blade rubber 15 is approximately half. An intermediate portion of the blade rubber 15 is disposed inside the rubber holder 16 and is covered with the rubber holder 16, and only the lip portion 22 is exposed to the outside. Further, as shown in FIG. 1, a mounting portion 26 is fixed to a substantially middle portion of one side wall portion 16 b in the longitudinal direction, and the rubber holder 16 is attached to the tip of the wiper arm 13 at the mounting portion 26. . Further, fins 27 are integrally formed on the top wall portion 16a, and the aerodynamic characteristics of the wiper blade 11 are improved by the fins 27.

  As shown in FIG. 1, a holding portion 31 is provided at one end of the rubber holder 16 in the longitudinal direction (the side closer to the swing center of the wiper arm 13 when the wiper blade 11 is attached to the wiper arm 13). . As shown in FIG. 3A, the holding part 31 includes a pair of holding claws 32 (in the figure, only one side is shown, but the other side is also provided with similar holding claws). These holding claws 32 are formed in the shape of a rectangular cross section protruding from the side wall portion 16b in a direction perpendicular to the longitudinal direction of the blade rubber 15 and parallel to the wiping direction, and engage with the holding grooves 24, respectively. The blade rubber 15 is held. Further, the blade rubber 15 is provided with a pair of stopper portions 33a and 33b that sandwich the holding claws 32 from the longitudinal direction, and the holding claws 32 with respect to the blade rubber 15 are held in the holding grooves 24 by the stopper portions 33a and 33b. Movement in the direction along is restricted. That is, the blade rubber 15 is held by the rubber holder 16 in a state where the holding portion 31 is positioned in the longitudinal direction.

  Similarly, a holding portion 34 is provided at the other end of the rubber holder 16 in the longitudinal direction. As shown in FIG. 3B, the holding portion 34 has a pair of holding claws each having a rectangular cross section. 35 (only one side is shown in the figure, but the other side is provided with similar holding claws). These holding claws 35 are engaged with the holding grooves 24, thereby holding the blade rubber 15. . Further, the blade rubber 15 is not provided with a stopper portion at a portion where the holding claw 35 is engaged, and the holding claw 35 is movable along the holding groove 24. That is, the blade rubber 15 is held by the holding portion 34 so as to be movable in the axial direction with respect to the rubber holder 16.

  As described above, in the wiper blade 11, the pair of holding portions 31 and 34 are provided at both ends in the longitudinal direction of the rubber holder 16, and the blade rubber 15 is held at two points of the holding portions 31 and 34. . Therefore, when the pressing force from the wiper arm 13 is applied to the rubber holder 16 via the mounting portion 26, the pressing force is applied to the blade rubber 15 from two points at both ends of the rubber holder 16, that is, from the holding portions 31 and 34. As a result, the blade rubber 15 elastically contacts the window glass 14.

  Next, a method for manufacturing the blade rubber will be described. FIGS. 4A to 4D are schematic procedure diagrams schematically showing the procedure of the blade rubber manufacturing method of the present invention. As shown in FIGS. 4A to 4D, the blade rubber 15 described above includes a step of forming the blade rubber, a step of generating radical active sites by irradiation treatment on the blade rubber, and a graft starting from the radical active points. It is manufactured through a step of bonding monomers by polymerization and a step of cutting the lip portion of the blade rubber in the longitudinal direction.

  As a rubber material used for forming the blade rubber in the process shown in FIG. 4 (a), natural rubber, epoxidized natural rubber, and the like are used from the viewpoint of reducing the load on the environment by avoiding petroleum-based materials. Is used. Natural rubber is mainly composed of polyisopropylene.

  The epoxidation rate of the epoxidized natural rubber is preferably 50%, for example. Natural rubber and epoxidized natural rubber need only contain both, but in order to obtain an excellent noise reduction effect and deterioration resistance, the blended amount of epoxidized natural rubber and natural rubber should be It is preferable to set it to 23 weight% or more and less than 100 weight% with respect to the sum total. Furthermore, it is more preferable to set it as 30 to 80 weight%, and it is especially preferable to set it as 40 to 80 weight%. In addition, it is inferior to the noise reduction effect and deterioration resistance if it is only natural rubber. Further, in the case of only epoxidized natural rubber, there is a tendency that the viscoelastic properties are lowered as compared with the case of blending with natural rubber.

  As the reinforcing material for the rubber material, a mineral-based reinforcing material is used instead of a petroleum-based reinforcing material for the same reason as the rubber material. As the mineral-based reinforcing material, for example, known reinforcing materials such as silica, alumina, and other inorganic reinforcing materials can be appropriately selected and used. However, since it is easy to ensure viscoelastic properties and the like, silica is used. preferable. The compounding amount of the reinforcing material is usually 20 to 60% by weight, preferably 30 to 40% by weight, based on the rubber material.

  In addition to reinforcing materials, rubber materials are generally known such as vulcanizing agents (crosslinking agents), vulcanization accelerators, vulcanization accelerators, softeners, anti-aging agents, fillers, silane coupling agents, and the like. The additive can be blended and molded into a brate rubber by a conventionally known method such as press molding.

  Examples of the irradiation process for generating radical active sites on the blade rubber formed in the step shown in FIG. 4B include, for example, an electron beam irradiation process, an ultraviolet irradiation process, a plasma irradiation process, radiation (α rays, β rays, Examples of the irradiation process include a gamma ray, X-ray) irradiation process, a laser beam irradiation process, an ion beam irradiation process, and a corona discharge irradiation process. Among these, the electron beam irradiation treatment is particularly preferable from the viewpoint of high processing efficiency. By performing such irradiation treatment, radical active sites are generated in the blade rubber, and the graft polymerization reaction proceeds from the radical active sites as a starting point in the step shown in FIG.

  5 (a) and 5 (b) are explanatory views showing the reaction modes of the irradiation process, respectively. 5A and 5B show only the lip portion of the blade rubber formed before the blade rubber is cut, that is, the lip portions of the pair of blade rubbers face each other. As shown in FIGS. 5 (a) and 5 (b), there are two methods for the irradiation treatment for promoting the graft polymerization reaction starting from the radical active site to be generated.

  In the treatment shown in FIG. 5A, a radical active site is generated by irradiating rubber with an electron beam and the like, and then a monomer is attached to the blade rubber surface, and then a reactant (monomer) is bonded by graft polymerization. That is, it is a pre-irradiation process in which a radical active point is generated by performing an irradiation process in advance. In the pre-irradiation treatment, both the irradiation treatment and the graft polymerization reaction are preferably performed in a nitrogen atmosphere. The absorbed dose of the pre-irradiation treatment is preferably 50 to 500 kGy in a deoxygenated state.

  The process shown in FIG. 5B is a simultaneous irradiation process in which the generation of radical active sites and graft polymerization are simultaneously performed. In the simultaneous irradiation treatment, for example, irradiation with an electron beam or the like for generating the above-described radical active site is performed in a state in which a reactant used for graft polymerization is attached to the surface of the blade rubber by coating or dipping. The absorbed dose of the simultaneous irradiation treatment is preferably 10 to 200 kGy. In the present invention, the blade rubber can be manufactured by any of the pre-irradiation process and the simultaneous irradiation process.

Graft polymerization can be performed by a generally known method, and any of a hydrophobic material and a hydrophilic material may be used as the polymerizable monomer used in the graft polymerization. The hydrophobic material has at least one of vinyl group (CH ₂ ═CH—), isopropenyl group (CH ₂ ═C (CH ₃ ) —) and allyl group (CH ₂ ═CHCH ₂ —) in the molecule. Examples of the polymerizable monomer include a compound having a hydrophobic structure of hydrocarbon, organosilicon, or fluorine at the molecular terminal, or a functional group that can impart hydrophobicity by a secondary reaction after graft polymerization.

  Examples of such hydrophobic materials include ethyl methacrylate, vinyl methacrylate, styrene, cyclohexyl methacrylate, dodecyl methacrylate, ethyl acrylate, vinyl acrylate, cyclohexyl acrylate, dodecyl acrylate, trimethylsilyl methacrylate, methacrylic acid. Trimethoxysilylpropyl acid, 3- (methacryloyloxy) propyltris (trimethylsiloxy) silane, trimethylsilyl acrylate, trimethoxysilylpropyl acrylate, 3- (acryloyloxy) propyltris (trimethylsiloxy) silane, methacrylic acid 1H, 1H , 3H-tetrafluoropropyl, 2,2,2-trifluoroethyl methacrylate, 2- (perfluorobutyl) ethyl methacrylate, acrylic acid 1H, 1H, 3 - tetrafluoropropyl, 2,2,2-trifluoroethyl acrylate, methacrylic acid 2- (perfluorobutyl) ethyl, and derivatives thereof. These hydrophobic monomers may be used alone or in combination of two or more.

  Examples of the hydrophilic material include hydroxyethyl methacrylate (HEMA), hydroxyethyl acrylate (HEA), glycidyl methacrylate (GMA), acrylamide, and methacrylic acid. And metal salts thereof. These hydrophilic monomers may be used individually by 1 type, and 2 or more types may be mixed and used for them.

  The blade rubber described above is manufactured as a pair of blade rubber molded bodies (blade rubber intermediate bodies) formed so that the lip portions face each other. The pair of blade rubber molded bodies are cut in the longitudinal direction at the lip portion in the step shown in FIG. 4D to form a blade rubber.

  6A is an enlarged view showing a state where the monomer is bonded only to the lip portion of FIG. 2, and FIG. 6B is an enlarged view showing a state where the monomer is bonded to the entire blade rubber of FIG. is there. In FIGS. 6A and 6B, the portion where the monomer is bonded is indicated by hatching. Since the pair of rubber molded bodies are cut with the graft-polymerized monomer attached thereto, as shown in FIGS. 6A and 6B, no monomer is attached to the cutting surface 36 of the blade rubber. Since the blade rubber 15 normally wipes the wind glass at the edge portion that becomes the boundary between the side surfaces 37a and 37b of the lip portion 22 and the cut surface 36, the window glass is wiped by the side surfaces 37a and 37b to which the monomer is bonded. The window glass is not wiped by the cut surface 36 to which no monomer is attached. Further, the above-described irradiation and graft polymerization treatment for generating radical active sites such as an electron beam need not be performed on a portion of the blade rubber molded body that does not come into contact with the window glass, such as a head portion. Therefore, the portions not irradiated with the electron beam or the like are masked in advance, and only the necessary portions such as the lip portion 22 of the blade rubber molded body are irradiated with the electron beam or the like as in the example shown in FIGS. 6 (a) and 6 (b). May be performed.

As described above, since the wiper blade of the present invention uses naturally-derived components as the rubber material and the reinforcing material, it contributes to CO ₂ emission reduction and depetroleumation, and can reduce the environmental load.

  Further, by using natural rubber epoxidized as a rubber material in combination with natural rubber, viscoelastic properties equivalent to those in the case of a combination of natural rubber and ordinary petroleum-derived rubber such as chloroprene rubber can be secured. In particular, the blending amount of the epoxidized natural rubber is 23% by weight or more based on the total amount of the natural rubber, so that the viscoelastic characteristics are superior to the combination of the natural rubber and the petroleum-derived rubber described above. Can be obtained. Similarly, by using silica as a reinforcing material, excellent viscoelastic properties and the like can be ensured.

  Furthermore, since surface modification was performed by irradiation with an electron beam or the like instead of the chlorination treatment that is generally performed, the halogen-free and treatment of the treatment was ensured while ensuring the same friction characteristics as the chlorination. Environmental efficiency can be reduced at a higher level by improving efficiency.

  As mentioned above, the invention made by the present inventor has been specifically described based on the embodiments and examples, but the present invention is not limited to the embodiments and examples, and is within the scope not departing from the gist thereof. It goes without saying that various changes can be made.

  For example, in the present embodiment, the blade rubber 15 is manufactured as a pair of blade rubber molded bodies formed such that the lip portions 22 face each other, and the blade rubber 15 is cut in the longitudinal direction at the lip portions 22. However, the present invention is not limited to this, and the blade rubber 15 may be separately formed from the beginning, and the cutting step may be omitted.

  In the present embodiment, the wiper blade 11 wipes the front window glass 14 of the vehicle 12. However, the present invention is not limited to this, and the wiper blade 11 may wipe the rear window glass of the vehicle 12. Good.

  Further, in the present embodiment, the leaf spring member 25 is attached to the attachment groove 21a of the blade rubber 15. However, the structure is not limited to this, and the leaf spring member 25 is directly fixed to the blade rubber 15 by adhesion or the like. Also good.

  Furthermore, the present invention can be applied to wiper blades used in various types of wiper apparatuses such as a tandem type and a counter wiping type.

Hereinafter, the present invention will be further described by way of examples. In addition, this invention is not limited by these Examples.
(Reference Example 1)
As shown in Table 1, the following additives were blended with 100 parts by weight of natural rubber (NR).
That is, 2.25 parts by weight of sulfur (made by Tsurumi Chemical Co., Ltd.) as a vulcanizing agent, 5 parts by weight of zinc oxide (made by Sakai Chemical Industry Co., Ltd.), 2 parts by weight of stearic acid (made by Kao Corporation), N as a vulcanization accelerator -Tert-butylbenzothiazyl-2-sulfenamide (TBBS, Sanshin Chemical Co., Ltd.) 0.7 part by weight, and silica (Tosoh Silica Co., Ltd.) 35 parts by weight as a reinforcing material.

  This was press-molded to form a pair of blade rubber molded bodies, which were immersed in an aqueous solution having a HEMA concentration of 50% by weight and shown in FIG. 5 (b) of an electron beam of 10 kGy at a temperature of 25 ° C. Simultaneous irradiation treatment was performed (generation of radical active sites by electron beam irradiation and graft polymerization of HEMA were performed simultaneously).

  About the obtained blade rubber molded body, using a dynamic viscoelasticity measuring device, storage pruning elastic modulus (G ′) and loss pruning elastic modulus (G ″) at respective frequencies of 100 Hz, 500 Hz and 1024 Hz. The ratio G ″ / G ′, that is, loss tangent (loss factor) tan δ was measured.

  tan δ indicates how much energy is absorbed (changed to heat) when the material is deformed. The larger this value is, the more energy is absorbed, the impact resilience becomes smaller in the shock buffer test, and the resonance magnification becomes lower in the vibration test. Further, the frequencies of 100 Hz and 500 Hz correspond to the frequency of the reversal sound of the wiper blade and 1024 Hz of the squeal sound. That is, in the blade rubber, the larger the value of tan δ, the better the noise reduction effect and the deterioration resistance. The results are shown in Table 2 and the graph of FIG.

Example 1
As shown in Table 1, in Reference Example 1, NR80 parts by weight as a rubber material and 20 parts by weight of epoxidized natural rubber (ENR, epoxyprene 50 manufactured by Sanyo Trading Co., Ltd., epoxidation rate 50%) were blended. Similarly, a blade rubber molded body was molded and tan δ was measured. The results are shown in Table 2 and the graph of FIG. The ENR epoxidation rate is extracted from the catalog.

(Example 2)
As shown in Table 1, a blade rubber molded body was molded in the same manner as in Example 1 except that 60 parts by weight of NR and 40 parts by weight of ENR were blended, and tan δ was measured. The results are shown in Table 2 and the graph of FIG.

(Example 3)
As shown in Table 1, a blade rubber molded body was molded in the same manner as in Example 1 except that 40 parts by weight of NR and 60 parts by weight of ENR were blended, and tan δ was measured. The results are shown in Table 2 and the graph of FIG.

Example 4
As shown in Table 1, a blade rubber molded body was molded in the same manner as in Example 1 except that 20 parts by weight of NR and 80 parts by weight of ENR were blended, and tan δ was measured. The results are shown in Table 2 and the graph of FIG.

(Reference Example 2)
As shown in Table 1, a blade rubber molded body was molded in the same manner as in Reference Example 1 except that 100 parts by weight of ENR was blended instead of NR as a rubber material, and tan δ was measured. The results are shown in Table 2 and the graph of FIG.

(Comparative Example 1)
Tan δ was measured in an NWB blade rubber blended with NR and chloroprene rubber (CR) as a rubber material. The results are shown in Table 2 and the graph of FIG. Note that the broken line in FIG. 7 corresponds to tan δ in this example.

  From the results of Table 2 and FIG. 7, the blade rubber blended with NR and ENR of Examples 1 to 4 had a tan δ value exceeding 0.35 at any frequency of 100 Hz, 500 Hz, and 1024 Hz. In other words, it was found that the environmental load can be reduced while ensuring the viscoelastic properties and having a good noise reduction effect and deterioration resistance.

  When only NR was used as the rubber material as in Reference Example 1, it was found that the value of tan δ was low at any frequency and the product performance deteriorated. On the other hand, as in Reference Example 2, when only ENR was used as the rubber material, a tendency to decrease from Example 4 having the highest tan δ value was observed. For this reason, it was found that blending NR and ENR is preferable in order to impart high viscoelastic properties.

  Further, as long as NR and ENR were blended, tan δ tended to increase as the amount of ENR blended was increased. When compared with tan δ of blade rubber blended with NR and CR of Comparative Example 1, the amount of ENR having an epoxidation rate of 50% is set to 23% by weight or more based on the total of NR. It was found that the noise reduction effect and deterioration resistance can be improved.

  INDUSTRIAL APPLICATION This invention can be utilized for the blade rubber provided in the wiper blade which wipes on the glass surface.

DESCRIPTION OF SYMBOLS 11 Wiper blade 12 Vehicle 13 Wiper arm 14 Front window glass 15 Blade rubber 16 Rubber holder 16a Top wall part 16b Side wall part 17 Cover 21 Head part 21a Mounting groove 22 Lip part 23 Neck part 24 Holding groove 25 Leaf spring member 26 Attachment part 27 Fin 31 Holding part 32 Holding claw 33a, 33b Stopper part 34 Holding part 35 Holding claw 36 Cutting surface 37a Both side surfaces 37b Both side surfaces

Claims (1)

A wiper blade for wiping on a glass surface, comprising a blade rubber comprising natural rubber, epoxidized natural rubber, and a mineral-based reinforcement, wherein
The blade rubber is subjected to a surface treatment by a graft polymerization reaction by electron beam irradiation treatment;
The epoxidized natural rubber has an epoxidation rate of 50%;
The blended amount of the epoxidized natural rubber with the natural rubber is 40% by weight or more and 80% by weight or less; and
The mineral-based reinforcing material is silica having a blending amount of 30 to 40% by weight with respect to the natural rubber and the epoxidized natural rubber; a wiper blade .

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