JPS60184531A - Wiper blade - Google Patents

Abstract

PURPOSE:A wiper blade having an extremely low coefficient of friction and excellent resistance to oxidation, ozone, chemicals, abrasion, and permanent deformation, prepared by subjecting a wiper blade formed of a specified copolymer to fluorination. CONSTITUTION:A wiper blade formed of an ethylene/propylene copolymer (EPM) or an ethylene/propylene/diene compound copolymer (EPDM) is subjected to fluorination. In this way, fluorine atoms are bonded to the carbon atoms on the surface layer of EPM or EPDM to obtain a wiper blade having a low coefficient of friction and excellent resistances to oxidation, ozone, chemicals, abrasion, and permanent deformation.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wiper blade for wiping the windshield of vehicles such as automobiles and trains, or aircraft.

Wiper blades used in vehicles wipe away water droplets, snow, etc. adhering to the windshield surface by sliding on the windshield surface, so wiper blades do not wipe unevenly by hitting the windshield surface evenly. Furthermore, it is required to have low frictional resistance so that smooth operation and no unpleasant noises are produced.

For this reason, conventionally, wiper blades are made of natural rubber, synthetic rubber such as chloropyrene rubber, or synthetic resin such as nystomer or polyethylene, which imparts elasticity that allows for even sliding contact with the windshield surface. By subjecting the wind blade surface to chlorination or bromination treatment, chlorine atoms or bromine atoms are bonded to the carbon atoms forming the main chain, thereby reducing frictional resistance.

However, even if chlorination treatment or bromination treatment is applied, it is not possible to sufficiently reduce the frictional resistance.
The -C1 bond or C-Br bond is chemically unstable, and the bond is easily broken by heat, water, ultraviolet rays, ozone, oxygen, or chemicals, and C1l and Br are separated. Therefore, it is inferior in terms of environmental resistance, and its function as a wiper blade deteriorates in a short period of time.

On the other hand, if a high degree of chlorination treatment is performed to reduce frictional resistance and improve durability, the wiper blade surface becomes more prone to cracking (and the resistance to permanent deformation decreases, resulting in streaks). This leads to deterioration in wiping performance, such as the occurrence of wiping residue.

By the way, ethylene-propylene copolymer (hereinafter referred to as EPM)
), and ethylene-propylene-diene compound copolymer (hereinafter referred to as EPDM) to which a small amount of diene compound is added to improve the vulcanizability of EPM has aging resistance,
Furthermore, it is known to have extremely excellent properties in terms of ozone resistance, strong chemical resistance, and water resistance. Therefore, these E
I) If M or EPDM can be used as the material for the wiper blade, the above disadvantages can be overcome.

However, since EPM and El)DM are saturated organic polymer compounds that do not have double bonds in their main chains, they do not form C-C6 bonds or C-Br bonds even after chlorination or bromination treatment. I can't.

The present invention was developed based on the fact that fluorine is extremely active and causes a substitution reaction with H in a C-H bond to form a C-F bond. ,ED
M or E P D M to form a wiper blade,
By fluorinating this wiper blade, carbon atoms and fluorine atoms are combined on the surface layer of the wiper blade, resulting in an extremely low coefficient of friction and excellent oxidation, ozone, chemical, and wear resistance. and to provide a wiper blade with excellent resistance to permanent deformation.

Examples of the present invention will be described below along with specific experimental examples.

To explain the method for manufacturing a wiper blade according to the present invention, first, EPM or EPDM is used as a material and is formed into a predetermined shape of a wiper blade.

Next, the wiper blade is subjected to fluorination treatment, and a hand-saturated organic polymer compound (EP) is applied to the surface layer of the wiper blade.
A fluorine atom is bonded to a carbon atom forming the main chain of M or EPDM).

Here, as the fluorination treatment, a gas treatment method and a liquid treatment method can be considered. As a gas treatment method, molding is performed in an atmosphere containing only fluorine gas, an atmosphere containing fluorine gas mixed with a small amount of oxygen gas, or an atmosphere containing fluorine gas and oxygen gas diluted with an inert gas such as helium, argon, or nitrogen. Directly expose the wiper blade after processing,
Examples of the liquid treatment method include a method in which the wiper blade after molding is immersed in a fluorine-based solvent in which fluorine gas is dispersed and dissolved in perfluorohexane. In order to accelerate the fluorination treatment, each of the above treatments may be performed while irradiating ultraviolet rays or radiation, or plasma treatment may be used in combination.

Next, an experimental example comparing the characteristics of a conventional wiper blade and a wiper blade according to the present invention will be described below.

[Experimental Example 1] Automotive wiper blades were molded using EPM and EPDM as raw materials, and were mixed with 90% nitrogen (volume %).
A wiper blade according to the present invention was obtained by fluorination treatment at 40° C. for 40 minutes in a mixed gas containing 10% fluorine. On the other hand, a conventional wiper blade was obtained by chlorinating a wiper blade made from molded natural rubber.

Then, the wiper blade according to the present invention and the conventional wiper blade were subjected to a wiping durability test to measure the friction coefficient, and the results are shown in [Table 1].

The glass used for the wiping durability test was flat glass, the length of the wiper blade was 100 mm, and the arm pressure was 1.
55, the stroke length was 150 M, and one cycle consisted of water spraying for 1 minute and stopping water for 4 minutes at a speed of 45 reciprocations per minute, and the coefficient of friction (μ) was measured as a dry value. Also〔
In Table 1, A is a conventional wiper blade made of natural rubber that has been chlorinated, B is a wiper blade that is made of EPDM that has been fluorinated, and C is a wiper blade that is made of EPDM that has been fluorinated. .

[Table 1 Coefficient of Friction (μ)] As is clear from this [Table 1], the wiper 7' L/-D according to the present invention has a higher performance than the conventional wiper blade after 500,000 reciprocating tests from the beginning of the durability test. It can be seen that the coefficient of friction (μ) is extremely small until the end, and the durability is several ten times that of conventional wiper blades.

[Experimental Example 2] As in Experimental Example 1, a wiper blade obtained by fluorinating each of EPM and EPDM as raw materials and a conventional wiper blade obtained by chlorinating natural rubber with a cut body were used. We conducted a wiping durability test and determined the amount of wear (π wag) per unit length (1 cfn), and the results were
The results are summarized in Table 2].

In the cut body wiping durability test, the length of the wiper blade was 450 vryn, the arm pressure was 700 t, the speed was 45 reciprocations per minute, water was sprinkled for 4 minutes, water was stopped for 0.5 minutes, and water was stopped for 0.5 minutes.
One cycle consisted of a complete stop for 5 minutes. In addition, [Table 2
], A to C are the same as above.

[Table 2 Amount of wear (+++ J/cm)] As is clear from [Table 2], the wiper blade according to the present invention
Amount of wear after 0 hours of durability and 5 of conventional wiper blades
The amount of wear after 0 hours of durability is approximately the same, and it can be seen that the fluorinated wiper blade according to the present invention has extremely excellent wear resistance compared to the conventional chlorinated wiper blade.

[Experimental Example 3] Similarly to Experimental Example 1, wiper blades were formed using EPM and EPDM as raw materials, and a wiper blade obtained by subjecting these to fluorination treatment and a conventional wiper blade obtained by subjecting natural rubber to chlorination treatment. After a weather resistance test using a sunshine weather meter, the wiper blade was subjected to a wiping durability test. The results are shown in [Table 3].

In addition, the 4-way test using the Sunshine Weather Meter is J.
According to ISB7753 (Sunshine Carbon Arc Lamp Weathering Tester), the test was carried out for 48 hours at a black panel temperature of 63 °C and 3 °C, with a cycle of 120 minutes of irradiation and 18 minutes of spraying. Further, in [Table 3], A to C are the same as above.

[Table 3 Friction coefficient (μ) after weathering test] As is clear from [Table 3], even after the weathering test, the friction coefficient of the wiper blade treated with fluorinated saturated organic polymer compound is almost the same as before the test. It can be seen that the wiper blades are extremely weather resistant compared to conventional wiper blades.

[Experimental Example 4] Wiper blades were molded using EPM and EPDM as raw materials in the same way as Experimental Example 1, and a wiper blade obtained by fluorinating them and a conventional wiper blade obtained by chlorinating natural rubber. Temperature 40 for wiper blade
℃ and an ozone concentration of 50 pphm, each wiper blade was stretched 20% and held, and the presence or absence of cracks was examined. The results are shown in [Table 4]. still,
In [Table 4], A to C are the same as above.

[Table 4: Presence or absence of crack occurrence] As is clear from [Table 4], E P M or E 1)
It can be seen that wiper blades with fluorinated DM have extremely superior ozone removal properties compared to conventional wiper blades.

As explained above, according to the present invention, EPM or EP
Wiper blades are molded using DM, and the wiper blades are subjected to fluorination treatment to reduce the width, and at the same time improve aging resistance, oxidation resistance, ozone resistance, permanent deformation resistance, and environmental resistance. Patent applicant: Honda Motor Co., Ltd., Kokoku Rubber Industries Co., Ltd., Patent Attorney, 2) Patent Attorney: Kuni Ohashi, Patent Attorney, Honda Motor Co., Ltd., Kokoku Rubber Industries Co., Ltd. Patent attorney Koyama Written amendment (voluntary) February 13, 1985 Commissioner of the Japan Patent Office Manabu Shiga 1, Patent Application No. 1987-40190 2, Title of invention Wiper 3 , Relationship with the person making the amendment Patent applicant (532) Honda Motor Co., Ltd. Kokoku Rubber Industries Co., Ltd. 4, Agent (ff735) Patent attorney 2 1) Part 5, Date of amendment order Voluntary 6, Amendment Column 7 of the detailed description of the invention in the subject specification, the description of the contents of the amendment, is amended as follows.

(1) On page 2, line 6 of the specification, "elastomer or synthetic resin such as polyethylene" is replaced with "thermoplastic elastomer such as urethane type or synthetic resin such as polyethylene"
I am corrected.

(2) Page 3, line 11 of the specification: “In terms of water resistance...
" has been corrected to "Water resistance and permanent deformation resistance...".

(3) On page 4, line 6 of the specification, "oxidation resistance" is corrected to "aging resistance."

(4) In the first and second lines of page 5 of the specification, [・
...or fluorine gas and oxygen residue with helium,
Correct the statement to read ``...or fluorine gas or a mixture of fluorine gas and a small amount of oxygen gas, etc., called helium.''

(5) The phrase “oxidation resistance” in the first line of page 12 of the specification,
I corrected it to "aging resistance."

Hand-made yarn C/M JF book (spontaneous) February 14, 1985 Manabu Shiga, Commissioner of the Patent Office 1 Display of incident Special warehouse No. 59-40190 2. Name of the invention Wi-Paper 3. Person who makes corrections Relationship to the incident Patent issue/input (532) Kida Giken Kogyo Co., Ltd. Kokoku Rubber Industries Co., Ltd. 4. Agent 5. Date of amendment order: Voluntary 6. Subject of correction Detailed description of the invention in the specification 7. Contents of correction The specification is amended as follows.

In the first line of page 12 of the specification, "aging resistance" is corrected to "abrasion resistance."

Claims (1)

[Claims] By fluorinating a wiper blade made of either ethylene-propylene copolymer (EPM) or ethylene-propylene-diene compound copolymer (EPDM), the ethylene-propylene copolymer or ethylene - A wiper blade formed by bonding fluorine atoms to carbon atoms in the surface layer of a propylene-diene compound copolymer.