KR100837370B1 - Windshield wiper blade coating composition - Google Patents

Abstract

The present invention relates to a lubricating coating composition for a vehicle wiper blade, and more particularly to a lubricating coating composition for a vehicle wiper blade in which a synthetic resin, which is a solid lubricating fine powder and a binder (binder), is dispersed in an organic solvent. It relates to a lubricating coating composition for a vehicle wiper blade further comprising oxide particles.

The present invention provides a wiper blade which prevents the occurrence of jointing and bumping of the wiper blade and enables smooth and quiet operation for a long time even in a dusty or dusty environment.

Wiper, Blade, Fine Powder, Hydrophilic, Oxide, Lubrication, Paint, Graphite

Description

Windshield wiper blade coating composition for vehicle wiper blades

1 is a schematic diagram showing a process of cutting a blade in a tandem (tandem) used in the present invention.

2 is a schematic view showing a state in which the lubricating coating composition of the present invention is spray-sprayed to the blade in the tandem state used in the present invention.

Figure 3 is a schematic diagram showing an embodiment in which the lubricating paint composition is coated on the blade in the tandem state but cut according to the present invention.

Figure 4 is a schematic diagram showing a comparative example in which the lubricating coating composition is coated on the blade separated by cutting to compare with the blade according to FIG.

※ Explanation of code for main part of drawing ※

10: blade rubber 20: round blade

30: spray gun 40: cut blade rubber

50: coating film

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricating paint composition for vehicle wiper blades, and more particularly, to prevent the occurrence of jointing, bumping, and sanding of the wiper blades used to secure a good view of the windshield of a vehicle. In addition, the present invention relates to a lubricating paint composition for a vehicle wiper blade that can operate smoothly and quietly for a long time even in a dusty environment.

In recent years, in order to ensure a good field of view on windshields such as automobiles, the glass may be water repelled with a siloxane compound. When the water repellent treatment is carried out, the water becomes spherical and escapes from the glass surface. Since no water film is formed on the glass, the contact area between the glass and the wiper blade rubber increases, which increases the coefficient of friction, which causes the sound to collide. Chattering and jointing are easy to occur. In addition, since the water-repellent wax of the automatic car wash adheres to the windshield to form an oil film, it is difficult to form a water film on the surface of the glass as described above, and the sound of bumping is likely to occur.

The wiper blade rubber is worn by foreign materials such as friction and sand after a long period of use, which causes bumping noises, joints, marks after wiping, and hinders operation.

In order to solve the above problem, Korean Laid-Open Patent Publication No. 2002-0091721 discloses a technique related to a wiper blade lubricating coating composition containing a silicone powder composed of a three-dimensional combination of silicone rubber powder and siloxane. The composition has a low coefficient of friction and shows good sliding properties for the water-repellent glass, but since the silicon powder is very hard particles, it acts like a foreign substance, causing streaks due to marks after wiping. There is a problem that occurs. In addition, since silicone rubber powder and silicone powder are chemically inert and lack adhesiveness with a resin which is a binder component, they fall off easily. Wiper blades are abraded by adhesion of foreign matter such as sand, and under such circumstances, their lubrication durability is lacking.

In addition, Japanese Laid-Open Patent Publication No. 2002-20695 has an elastic modulus (0.5% modulus) of 1 MPa or more and a 1% elongation at break of the binder hardened with a coating agent composed of a solid lubricant and a binder. As mentioned above, the technique regarding the coating agent for wiper blade rubber whose volume ratio of the said solid lubricant with respect to the said binder is 0.25-1.0 is disclosed. By using a binder exhibiting moderate elasticity and extensibility, the coating agent lowers the friction coefficient of the binder itself, and achieves both low friction and wear resistance by minimizing the amount of the solid lubricant added. However, when the binder is relatively large, problems such as generation of streaks and joints due to marks after wiping are likely to occur. In addition, since there is little solid lubricant, when sand adheres to the wiper blade, the coefficient of friction rapidly increases, and thus the slidability is poor.

SUMMARY OF THE INVENTION The present invention solves the above problems, and when hydrophilic oxide particles are added to a lubricating paint composition for a vehicle wiper blade, the film becomes hydrophilic to form a water film, and serves to reduce the friction coefficient at the interface between the wiper blade and the glass. do. In addition, since the hydrophilic oxide is a fine particle, it has been found that the wiper blade does not affect the wiping property (wiping), and also has an effect of reinforcing the film due to its properties, thereby improving wear resistance, thereby completing the present invention. It was.

Accordingly, an object of the present invention is to lower the coefficient of friction between the glass and the wiper blade rubber, to show excellent long-term lubrication even in the water-repellent glass or the glass with the oil film, and to lubricate the wiper blade for a vehicle without scratches and seams after wiping. It is to provide a coating composition.

Another object of the present invention is to provide a method for producing a wiper blade for coating the lubricating coating composition on the surface of the lip portion of the wiper blade rubber.

Lubricating paint composition for a vehicle wiper blade of the present invention for achieving the above object is one or more from the group consisting of graphite, MoS ₂ , polytetrafluoroethylene (PTFE), boron nitride, silicone resin, nylon resin, and polyethylene resin In the lubricating coating composition for a vehicle wiper blade in which a fine lubricated fine powder selected and a synthetic resin as a binder (binder) are dispersed in an organic solvent, the composition is a group consisting of Si, Al, Fe, Ti, Zn, Ce, and Sn. It further comprises one or more hydrophilic oxide particles selected from, wherein the hydrophilic oxide is characterized in that the particles of the surface coated with SiO ₂ or SiO ₂ particles.

Method for manufacturing a vehicle wiper blade coated with the lubricating paint composition for achieving another object of the present invention is to cut the center portion of the tandem-shaped wiper blade rubber so as not to separate, the lubricating paint composition for the vehicle wiper blade After coating the lip of the blade with an air spray, and drying and curing to form a coating film, the wiper blade of the vehicle wiper blade coated with a lubricating paint composition, characterized in that the tandem-shaped wiper blade rubber is separated from the lip end Manufacturing method.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

As described above, the present invention is a lubricating paint composition for a vehicle wiper blade in which solid lubricated fine powder and hydrophilic oxide particles are dispersed in an organic solvent together with a synthetic resin as a binder (binder) and the lubricating paint on the lip portion of the wiper blade rubber. A vehicle wiper blade having a coating of the composition.

Examples of the solid lubricant used in the present invention include fine powder selected from the group consisting of mineral graphite, MoS ₂ , polytetrafluoroethylene (PTFE), boron nitride, silicone resin, nylon resin, and polyethylene resin. And graphite in the form of scale pieces is more preferable. Graphite is a very soft, lubricious layered crystalline mineral that is ideal for use in wiper blades that change from dry to wet because they do not lose their lubricity even in contact with water. The average particle diameter of the solid lubricant is 2 to 15 µm, and the average particle diameter is more preferably 2 to 5 µm. If the average particle diameter is less than 2 µm, sufficient lubricity cannot be obtained. If the average particle diameter is more than 15 µm, the wiper blades are uncleaned (wipe). As long as the solid lubricant satisfies the performance, graphite alone or two or more different solid lubricants may be used in combination. The blending amount of graphite is 100 to 600 parts by weight based on 100 parts by weight of the binder, more preferably 200 to 550 parts by weight. The blending amount of the solid lubricant including graphite is used in an amount of 100 to 700 parts by weight based on 100 parts by weight of the binder, and preferably 215 to 550 parts by weight. If the blending amount is less than 100 parts by weight, sufficient lubricity cannot be obtained, and the friction coefficient becomes large especially when sand adheres to the wiper blade. When the blending amount exceeds 700 parts by weight, the slidability is good, but the film strength is lowered, resulting in poor durability.

Examples of the hydrophilic oxide used in the present invention include oxide particles such as Si, Al, Fe, Ti, Zn, Ce, Sn and the like. The hydrophilic oxide may be used alone or in a mixture of plural kinds, but SiO ₂ Or particles of a hydrophilic oxide whose surface is coated with SiO ₂ are particularly preferred.

SiO ₂ of the present invention may use a silica colloid solution (silica sol) dispersed in a colloidal shape in an organic solvent such as hydrophilic fumed silica (Hydrophilic Fumed Silicas) or ethyl alcohol, methyl ethyl ketone and the like.

Although the average particle diameter of the said hydrophilic oxide is 2-8000 nm, 10-100 nm is preferable. If the average particle diameter is 2 nm or less, oxides are easily lost from the coating and the reinforcing effect is not sufficient. At an average particle diameter of 8000 nm or more, the wiping blade (wipeability) decreases. Although the compounding quantity of the said hydrophilic oxide is 20-100 weight part with respect to 100 weight part of binders, 50-75 weight part is preferable. If the blending amount is less than 20 parts by weight, sufficient hydrophilicity cannot be obtained. If the blending amount is more than 100 parts by weight, the hydrophilicity is good, but the film strength is lowered, resulting in poor durability.

As the binder (binder) used in the present invention, polyester polyol resin, polyether polyol resin, urethane resin, silicone modified urethane resin, hydroxyl group-containing fluorine resin, urethane modified epoxy resin, diglycidyl ester, silicone resin, silicone composition, etc. This is used. In addition, a silicone rubber-based composition is used, and specific examples thereof include dimethylsilicone rubber, methylphenylvinylsilicone rubber, methylvinylsilicone rubber, and fluorosilicone rubber. It will not specifically limit, if it satisfies necessary performances, such as adhesiveness with respect to a wiper blade rubber, and followability with respect to the elongation of rubber | gum, It may be used individually or in combination of 2 or more types.

According to the present invention, the binder, the solid lubricant and the hydrophilic oxide are mixed in the presence of an organic solvent and dispersed in a homomixer to obtain a paint composition. It is preferable that the organic solvent which can be used for this invention can melt | dissolve a binder. For example, methyl ethyl ketone, toluene, ethyl acetate or a mixture thereof is preferable, and the amount of these organic solvents used is 1600 to 18000 parts by weight. In addition, it is possible to further add a curing agent and a curing catalyst to the coating composition, the solid content concentration at this time is 5 to 15% by weight, the target film thickness can not be obtained at less than 5% by weight, satisfactory sliding properties are obtained. If it exceeds 15% by weight, the film thickness becomes thick, and the wiping property deteriorates.

Looking at the method of manufacturing the wiper blade of the present invention by coating the coating composition of the present invention on the wiper blade rubber, first, as shown in Figure 1, the wiper blade rubber 10 is molded in a tandem shape of two pairs. In order to improve the slipperiness of the rubber surface after molding, a chemical conversion treatment called halogenation treatment is applied. After the halogenation treatment, rubber is cut by two round blades 20 from both sides as shown in FIG. However, leave 0.1 mm or less of thickness at the center of a cutting part, without cutting, and let it be a state which is not cut completely.

As shown in FIG. 2, by coating the blade rubber 10 in the tandem state not completely cut with the spray gun 30, the coating composition is difficult to coat on the cut surface at the time of coating, and thus cut as shown in FIG. 3. The finish of the coating film 50 of the edge part of the blade rubber 40 is good, and generation | occurrence | production of the streaks by the mark after initial wiping can be prevented. This coating method is not limited to the paint composition of the present invention can be widely applied to the paint composition for the wiper blade.

When the wiper blade is cut and coated, the coating composition is easily adhered to the edge portion of the cut blade rubber 40 as shown in FIG. 4, and the coating layer 50 at the edge portion is irregular, thereby preventing initial cleaning (wiping). Worsens.

There is also a method of cutting after coating in a tandem state after halogenation treatment. Although the finish of the edge is good, there is a possibility of damaging the coating film during the cutting operation, there is a problem in the process.

When using the coating composition of this invention, the hardener and hardening catalyst for hardening a binder are added suitably as needed.

As the curing agent, polyisocyanate, polyamide amine, aliphatic polyamine, alicyclic diamine, tertiary amine is used. Moreover, you may use together curing catalysts, such as a tin type, a platinum type, an organic peroxide, etc.

According to the present invention, the thickness of the coating film 40 is preferably 3 to 10 µm. If the thickness is less than 3 µm, satisfactory sliding properties and durability cannot be obtained.

As for hardening conditions, 30 to 60 minutes are preferable at 50-120 degreeC, and temperature and time are set in consideration of the hardening temperature of a binder and the heat-resistant temperature of a wiper blade rubber material.

After curing, the two ends of the tandem wiper blade rubber can be grasped by hand and easily to be separated.

As a wiper blade which can coat the coating composition of this invention, natural rubber, ethylene propylene rubber, isopropylene rubber, styrene-butadiene rubber, chloroprene rubber, fluorine rubber, silicone rubber, these mixed compositions, etc. are mentioned. The poor adhesion material is coated after the silane primer treatment if necessary.

Hereinafter, the present invention will be described in detail with reference to Examples, but the scope of the present invention is not limited to the following Examples.

Example 1

100 parts by weight of a polyester polyol resin (NIPPOLLAN 1100 manufactured by NIPPON POLYURETHANE INDUSTRY Co., Ltd.) was diluted with 3000 parts by weight of methyl ethyl ketone and 2500 parts by weight of toluene, and scaled flaky natural graphite having an average particle diameter of about 4 μm as a solid lubricant in the solution. 75 parts by weight of hydrophilic fumed silica (trade name AEROSIL 200, manufactured by DEGUSSA HULS AG) having an average particle diameter of about 12 nm as a hydrophilic oxide was mixed and dispersed to prepare a coating composition.

75 parts by weight of a curing agent polyisocyanate (trade name CORONATE HX of NIPPON POLYURETHANE INDUSTRY Co., Ltd.) was added to the coating composition, and coated on a tandem wiper blade cut in the center portion to have a film thickness of about 7 μm with a spray, and at 70 ° C. Cured for 30 minutes.

After hardening, both ends of the tandem wiper blade rubber were pulled by hand and the test mentioned later was performed about the said wiper blade. The evaluation results are shown in Table 3 below.

Examples 2-6

The compounding amount of the solid lubricant and the hydrophilic oxide of Example 1 was prepared as shown in Table 1 below, and was coated on a wiper blade made of natural rubber in a tandem state to have a film thickness of about 7 μm with a spray, and cured at 70 ° C. for 30 minutes.

After hardening, both ends of the tandem wiper blade rubber were pulled by hand and the test mentioned later was performed about the said wiper blade. The evaluation results are shown in Table 3 below.

Example Hydrophilic oxide Solid lubricant (unit: parts by weight) Fumed silica black smoke Tetrafluoroethylene nylon Sum 2 20 600 50 50 700 3 50 400 30 430 4 100 200 30 30 260 5 75 200 15 215 6 20 100 15 115

Fumed silica: Brand name AEROSIL'200 from DEGUSSA HULS AG, average particle diameter 12 nm

Tetrafluoroethylene: Brand name KTL-500F of KITAMURA, the average particle diameter of 1 micrometer

Nylon: Brand name SP-5 of TORAY company, 3 micrometers in average particle diameter

Graphite: Brand name FBF of CHUETSU GRAPHITE WORKS, average particle size 4㎛

Comparative Example 1

100 parts by weight of polyester polyol resin (NIPPOLLAN 1100 manufactured by NIPPON POLYURETHANE INDUSTRY Co., Ltd.) was diluted at 3000 parts by weight of methyl ethyl ketone and 2500 parts by weight of toluene, and scale-shaped natural graphite (CHUETSU) having an average particle diameter of about 4 μm as a solid lubricant in the solution. 550 parts by weight of a brand name FBF) of GRAPHITE WORKS was mixed and dispersed to prepare a coating composition.

75 parts by weight of a curing agent polyisocyanate (trade name CORONATE HX of NIPPON POLYURETHANE INDUSTRY Co., Ltd.) was added to the coating composition, coated with a wiper blade made of natural rubber in tandem to have a film thickness of about 7 μm, and cured at 70 ° C. for 30 minutes. .

After hardening, both ends of the tandem wiper blade rubber were pulled by hand and the test mentioned later was performed about the said wiper blade. The evaluation results are shown in Table 4 below.

Comparative Examples 2 to 4

The compounding amounts of the solid lubricant and the hydrophilic oxide of Comparative Example 1 were prepared as shown in Table 2 below, coated on a wiper blade of natural rubber in a tandem state to have a film thickness of 7 μm with a spray, and cured at 70 ° C. for 30 minutes.

After hardening, both ends of the tandem wiper blade rubber were pulled by hand and the test mentioned later was performed about the said wiper blade. The evaluation results are shown in Table 4 below.

Comparative example Hydrophilic oxide Solid lubricant (unit: parts by weight) Fumed silica black smoke Tetrafluoroethylene nylon Sum 2 10 650 50 50 750 3 110 550 - - 550 4 110 75 15 - 90

Fumed silica: Brand name AEROSIL'200 from DEGUSSA HULS AG, average particle diameter 12 nm

Tetrafluoroethylene: Brand name KTL-500F of KITAMURA, the average particle diameter of 1 micrometer

Nylon: Brand name SP-5 of TORAY company, 3 micrometers in average particle diameter

Graphite: Brand name FBF of CHUETSU GRAPHITE WORKS, average particle size 4㎛

[Slipability test]

The test apparatus based on the test apparatus used for the wiper blade performance evaluation of JIS D5710 is used, and a water-repellent treatment is performed to glass before a test (water repellent: brand name CHOGLACO of SOFT99 company).

The glass is operated 500,000 times while spraying 500 μs / min of water uniformly. The operating speed of the wiper blades is 40 cycles / min. At 100,000 times, 300,000 times, and 500,000 times of operation, the operating voltage is gradually lowered from the normal voltage (13.5V) every 0.5V, and the voltage value causing the chattering is measured. The lower this voltage value is, the better the lubricity is, and the harder the sound of abutment can be said. If the wiper blade shakes large and does not run smoothly during the test, stop the test.

Assessment of mobility

5: no chattering below 9.5V

4: no sound hitting 10 ~ 11V

3: 11.5 ~ 12.5V no bumping sound

2: 13.0-13.5V no sound bump

1: 13.0-13.5V sound with bump

[Implicity (Wipe) Test and Joint Confirmation]

Use a test apparatus in accordance with the test apparatus used for the wiper blade performance evaluation specified in JIS D5710, and operate for 15 minutes in the absence of water, and then check the water repellency of the windshield. Thereafter, it is operated 500,000 times while spraying water at 500 kW / min uniformly. The operating speed of the wiper blade is 40 cycles / min. 100,000 times, 300,000 times, and 500,000 times of operation shall be checked for erosion (wipe) and joints. In addition, erosion (wiping) evaluates when the wiper blade is closed. If the wiper blade shakes significantly and does not run smoothly during the test, stop the test.

-Evaluation score of imperfection

5: It can be wiped almost completely.

4: Less than two thin stripes remain.

3: 5 thin stripes remain.

2: Partially thin stripes remain.

1: The stripe to strip shape remains.

Evaluation of joint

○: no abnormal sound

×: abnormal sound

Example Test Results Example One 2 3 4 5 6   Slidability Early 5 5 5 5 5 5 100,000 times 5 5 5 5 5 5 300,000 times 5 4 5 4 5 4 500,000 times 4 3 4 4 4 3  Infertility (wipe) Early 5 5 5 5 5 5 100,000 times 5 5 5 5 5 5 300,000 times 4 4 4 4 4 4 500,000 times 4 3 4 3 4 3  Connection Early ○ ○ ○ ○ ○ ○ 100,000 times ○ ○ ○ ○ ○ ○ 300,000 times ○ ○ ○ ○ ○ ○ 500,000 times ○ ○ ○ ○ ○ ○

Test result of comparative example Comparative example One 2 3 4  Slidability Early 5 5 5 3 100,000 times 4 3 4 2 300,000 times 3 3 2 One 500,000 times 2 2 2 stop  Infertility (wipe) Early 5 5 4 4 100,000 times 4 4 3 3 300,000 times 3 3 2 2 500,000 times 2 2 One stop  Connection Early ○ ○ ○ ○ 100,000 times ○ ○ ○ ○ 300,000 times ○ ○ ○ ○ 500,000 times ○ × ○ stop

The present invention provides a coating composition containing a solid lubricant and a hydrophilic oxide on the lip of a vehicle wiper blade to form the composition having a film thickness of 3 to 10 µm, thereby making it possible to join and bump the wiper blade. ), And provide a wiper blade that can operate smoothly and quietly for a long time even in a sandy or dusty environment. In addition, by coating in a tandem state, a vehicle wiper blade excellent in initial inertia (wipe) can be realized.

Claims (9)

Organic solvents are synthetic solvents which are solid lubricating fine powders selected from the group consisting of graphite, MoS ₂ , polytetrafluoroethylene (PTFE), boron nitride, silicone resins, nylon resins, and polyethylene resins, and binders (binders). In the lubricating coating composition for a vehicle wiper blade dispersed in the Lubricating paint composition for a vehicle wiper blade, characterized in that the composition further comprises a hydrocolloidal solution (Hydrophilic Fumed Silicas) or a colloidal silica colloid (colloid) solution in an organic solvent. delete The lubricant coating composition for a vehicle wiper blade according to claim 1, wherein the graphite has an average particle diameter of 2 to 15 µm and 100 parts by weight to 600 parts by weight with respect to 100 parts by weight of the binder. delete delete The lubricating coating composition for a vehicle wiper blade according to claim 1, wherein the hydrophilic fumed silica or silica colloid has an average particle diameter of 2 to 8000 nm, and the amount of the hydrophilic fumed silica or silica colloid is 20 parts by weight to 100 parts by weight with respect to 100 parts by weight of the binder. . delete delete The lubricating paint composition for a vehicle wiper blade according to claim 1, wherein the organic solvent is ethyl alcohol or methyl ethyl ketone.

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