JP-7855809-B1 - Wiper blade rubber, method for manufacturing the same, and method for inspecting the same

JP7855809B1JP 7855809 B1JP7855809 B1JP 7855809B1JP-7855809-B1

Abstract

The wiper blade rubber (10) has a contact sliding portion (121) that contacts and slides against the surface of another component. The skewness Ssk of the contact sliding portion (121) is 0 or more and 0.4 or less.

Inventors

三田浩
▲高▼橋伸治
國定孝志
松田尚

Assignees

バンドー化学株式会社

Dates

Publication Date: 20260508
Application Date: 20260116
Priority Date: 20250121

Claims (12)

A wiper blade rubber having a contact sliding portion that contacts and slides against the surface of another component, A wiper blade rubber having a skewness Ssk of 0 or more and 0.4 or less in the contact sliding portion.
In the wiper blade rubber described in claim 1, The contact sliding portion is a wiper blade rubber whose surface is made of a cross-linked rubber composition that has been subjected to chlorine treatment.
In the wiper blade rubber described in claim 2, A wiper blade rubber in which the amount of chlorine added by the chlorination treatment in the contact sliding portion is 0.1% by mass or more and 3.5% by mass or less.
In the wiper blade rubber described in claim 2 , A wiper blade rubber in which the rubber component of the crosslinked rubber composition is a blend rubber containing natural rubber and chloroprene rubber.
In the wiper blade rubber described in claim 4, A wiper blade rubber in which the content of natural rubber in the rubber component is greater than the content of chloroprene rubber.
In the wiper blade rubber described in claim 2 , The aforementioned crosslinked rubber composition is a wiper blade rubber in which sulfur is used as a crosslinking agent.
In the wiper blade rubber described in claim 1, The contact sliding portion is a wiper blade rubber whose surface is covered with a graphite coating layer that has been treated with a chlorine-treated crosslinked rubber composition.
A method for manufacturing wiper blade rubber, comprising the step of immersing a molded body formed from a crosslinked rubber composition for manufacturing wiper blade rubber in a chlorinated aqueous solution to perform a chlorinated treatment, A method for manufacturing wiper blade rubber, wherein the effective chlorine concentration of the chlorinated aqueous solution is 30 ppm or more and 600 ppm or less.
In the method for manufacturing a wiper blade rubber as described in claim 8, A method for producing wiper blade rubber, wherein the chlorinated aqueous solution is an aqueous solution obtained by adding an acid to an aqueous solution of hypochlorous acid and/or a hypochlorite salt.
In the method for manufacturing a wiper blade rubber as described in claim 8 , A method for manufacturing wiper blade rubber, wherein the pH of the chlorinated aqueous solution is 1.5 or higher and 2.4 or lower.
In the method for manufacturing a wiper blade rubber as described in claim 8 , A method for manufacturing a wiper blade rubber, comprising: removing the molded body from the chlorinated aqueous solution; immersing the molded body in washing water for cleaning; and subsequently removing the molded body from the washing water; and then immersing the molded body in hot water with a temperature higher than that of the washing water for further cleaning.
A method for inspecting a wiper blade rubber having a contact sliding portion that slides in contact with the surface of another component, A method for inspecting a wiper blade rubber, which involves determining the skewness Ssk of the contact sliding portion and determining that it is acceptable if it is between 0 and 0.4.

Description

This invention relates to wiper blade rubber, a method for manufacturing the same, and a method for inspecting the same. A technique for surface modification of wiper blade rubber by applying a chlorine treatment is known. For example, Patent Documents 1 and 2 disclose wiper blades that have been subjected to a chlorine treatment so that the surface chlorine concentration is between 1.0% by mass and 2.5% by mass. Japanese Patent Publication No. 2019-64281Patent No. 6018832 The present invention relates to a wiper blade rubber having a contact sliding portion that contacts and slides against the surface of another component, wherein the skewness Ssk of the contact sliding portion is 0 or more and 0.4 or less. The present invention relates to a method for manufacturing wiper blade rubber, comprising the step of immersing a molded body formed from a crosslinked rubber composition for the manufacture of wiper blade rubber in a chlorinated aqueous solution to perform a chlorinated treatment, wherein the effective chlorine concentration of the chlorinated aqueous solution is 30 ppm or more and 600 ppm or less. The present invention relates to a method for inspecting a wiper blade rubber having a contact sliding portion that contacts and slides against the surface of another component, wherein the skewness Ssk of the contact sliding portion is determined, and if it is 0 or more and 0.4 or less, it is judged to be acceptable. This is a perspective view of one piece of wiper blade rubber according to Embodiment 1.This is a first explanatory diagram of a method for manufacturing a wiper blade rubber according to Embodiment 1.This is a second explanatory diagram of the method for manufacturing a wiper blade rubber according to Embodiment 1.This is a perspective view of one piece of wiper blade rubber according to Embodiment 2.This is an explanatory diagram of the method for manufacturing a wiper blade rubber according to Embodiment 2. The embodiments will be described in detail below. (Embodiment 1) Figure 1 shows a wiper blade rubber 10 according to Embodiment 1. The wiper blade rubber 10 according to Embodiment 1 is a generally flat, elongated rubber component. This wiper blade rubber 10 has a mounting and holding portion 11 on one side in the width direction, a lip portion 12 on the other side in the width direction, and a neck portion 13 connecting the mounting and holding portion 11 and the lip portion 12. The wiper blade rubber 10 according to Embodiment 1 has a mounting and holding portion 11 that is attached to and held by a vertebra of a wiper drive unit provided, for example, on the lower side of the windshield of an automobile. When the wiper drive unit is driven, the lip portion 12 of the wiper blade rubber 10 tilts with the neck portion 13 as a pivot point, and the surface of the elongated sheet-like tip portion 121 of the lip portion 12 contacts and slides against the surface of the windshield, thereby wiping away rain and other debris. Therefore, the surface of the sheet-like tip portion 121 of the lip portion 12 constitutes a contact sliding portion with respect to other members. The wiper blade rubber 10 according to Embodiment 1 is formed from a crosslinked rubber composition containing a rubber component and a rubber compounding agent. Examples of rubber components include natural rubber (NR), chloroprene rubber (CR), ethylene propylene diene rubber (EPDM), and styrene butadiene rubber (SBR). Examples of CR include sulfur-modified type, mercaptan-modified type, and xanthogene-modified type. The rubber component preferably contains one or more of these, and a blend of NR and CR is more preferable from the viewpoint of obtaining excellent wiping and sliding properties, as described later. When the rubber component is a blend of NR and CR, the mass ratio of the NR content to the CR content in the rubber component is preferably greater than 35/65, more preferably 40/60 or higher, more preferably 70/30 or lower, and more preferably 65/35 or lower, from a similar viewpoint. From a similar viewpoint, the NR content in the rubber component is preferably greater than the CR content. Examples of rubber compounding agents include carbon black, vulcanization accelerators, processing aids, vulcanization accelerators, and antioxidants. Examples of carbon black include channel black, furnace black, thermal black, and acetylene black. Examples of furnace black include SAF, ISAF, N-339, HAF, N-351, MAF, FEF, SRF, GPF, ECF, and N-234. Examples of thermal black include FT and MT. It is preferable that the carbon black contains one or more of these. The carbon black content in the crosslinked rubber composition is, for example, 20 parts by mass or more and 40 parts by mass per 100 parts by mass of rubber component. In this application, the content in the crosslinked rubber composition refers to the amount of crosslinked rubber composition blended into the uncrosslinked rubber composition before crosslinking. Examples o