KR20170140975A - The Coating Composition Used at Wiper Blade - Google Patents

Abstract

The present invention relates to a coating composition for a wiper blade. More specifically, the present invention relates to a coating composition for a wiper blade, which reduces noise and vibration phenomena during operation of a wiper and improves durability of the wiper by comprising a binder, a solid lubricant, an additive and a solvent, and including a spherical polymer fine powder in the additive. To this end, the coating composition for a wiper blade of the present invention comprises the organic solvent, the binder, the solid lubricant, and the additive containing the spherical polymer fine powder.

Description

TECHNICAL FIELD [0001] The present invention relates to a coating composition for a wiper blade,

The present invention relates to a coating composition for a wiper blade, which comprises a binder, a high defoaming agent, an additive and a solvent, wherein the additive comprises a spherical polymer fine powder to reduce noise and vibration during driving of the wiper, To a coating composition for a wiper blade.

In cars, a wiper is a windshield wiper to wipe windscreen raindrops and snow, and to keep the front watch running while driving. It is usually fitted only in windshields, but some vehicles may also be fitted to rear windows and headlamps. When the wiper blade on the end of the wiper arm is moved to the side of the windshield, the wiper blade blade made of rubber wipes the glass surface to remove the rainwater. On the other hand, the window washer functions to spray the washer liquid onto the windshield of the vehicle, so that the wiper can easily remove dust or worms attached to the glass.

Generally, a wiper blade, which distributes the water formed on the windshield of an automobile evenly to a thin water film by the operation of the wiper blade, is made of a rubber material and has a purpose of reducing the coefficient of friction to a wiper blade composed of materials such as natural rubber and chlorinated rubber Or a lubricating coating was used. The prior art has modified the surface of the wiper blade by halogenating the rubber surface of the wiper blade to reduce the friction coefficient of the rubber surface. However, since the surface of the wiper blade is hardened due to the decrease of the coefficient of friction, the ability to remove water drops over time and the vibration and noise are excessively generated There was a problem.

In addition, in recent years, water-wax-coated glass generally used for automatic washing or self-washing has not formed a water film which is useful for the operation of the wiper. In addition, when the wiper blade is operated due to an unevenly formed wax layer, A stick & slip phenomenon occurs due to a difference in friction coefficient, and noise and trembling due to the stick and slip phenomenon are becoming serious.

In order to effectively remove the tilting phenomenon and the noise generated by the difference in friction coefficient of the prior art as described above, a fluororesin, a silicone rubber powder and a silicone resin additive It was in use. Although the above-mentioned remedy is effective in preventing noise and trembling at the beginning of use, it has a problem that the durability is drastically reduced during long-term use.

Accordingly, in the present invention, when a wiper is operated by switching to a point contact, not a surface contact, between a glass surface and a coating surface of a wiper blade in a glass having an uneven wax layer formed by a water wax, noise and vibration are reduced and durability is improved I want to.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a coating composition for a wiper blade that reduces noise and vibration when the wiper is driven.

Another object of the present invention is to provide a coating composition for a wiper blade that improves the durability of a wiper by including a spherical polymer fine powder in an additive.

The technical objects to be achieved by the present invention are not limited to the above-mentioned technical problems, and other technical subjects which are not mentioned can be clearly understood by those skilled in the art from the description of the present invention .

According to the present invention, there is provided a coating composition for a wiper blade comprising an organic solvent, a binder, a solid lubricant, and an additive containing a spherical polymer fine powder.

In the present invention, the organic solvent is preferably 70 to 80% by weight.

In the present invention, it is preferable that the organic solvent is any one of toluene or methyl ethyl ketone or a mixture thereof.

In the present invention, the binder is preferably 10 to 15% by weight.

In the present invention, the binder is preferably a fluorine-based CAB-modified resin.

In the present invention, it is preferable that the fluorine-based CAB modified resin is prepared by dissolving vinylidene fluoride hexafluoropropylene in methyl ethyl ketone to prepare a fluorine resin and adding cellulose acylate butyrate as a modifier.

In the present invention, the solid lubricant is preferably 3 to 10% by weight.

In the present invention, it is preferable that the solid lubricant is any one or a mixture of two or more of graphite, polytetrafluoroethylene, or molybdenum disilicide.

In the present invention, the amount of the additive containing the spherical polymer fine powder is preferably 1 to 10% by weight.

In the present invention, it is preferable that the additive containing the spherical polymer fine powder is any one of silicone rubber powder or silicone resin powder or a mixture thereof.

In the present invention, it is preferable that the spherical polymer fine powder is any one of polymethylaylene adipamide having the following formula (1) or polynonamethylene terephthalamide having the formula (2) or a mixture thereof.

≪ Formula 1 >

(2)

In the present invention, the spherical polymer fine powder preferably has a diameter of 2 to 5 占 퐉.

According to the coating composition for a wiper blade of the present invention, it is effective to provide a coating composition for a wiper blade that reduces noise and vibration when the wiper is driven.

Further, according to the coating composition for a wiper blade of the present invention, it is another object to provide a coating composition for a wiper blade that improves the durability of a wiper by including a spherical polymer fine powder in an additive.

1 is a photograph of a non-uniform wax coating film formed on a windshield of a vehicle.
2 is a cross-sectional view of a conventional wiper when the water film is formed.
3 is a cross-sectional view of the conventional wiper when the water film is formed in an uneven manner.
4 is an enlarged sectional view of a vehicle wiper.
5 is an enlarged view of a wiper blotting coating layer according to the prior art.
6 is an enlarged view of a wiper blast coating layer according to an embodiment of the present invention;
7 is an enlarged view of a conventional wiper blade coating layer.
8 is an enlarged photograph of a wiper blotting coating layer according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately It should be interpreted in accordance with the meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined. Therefore, the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It is to be understood that equivalents and modifications are possible.

The present invention relates to a coating composition for a wiper blade. Specifically, the conventional wiper blade 11 distributes the water formed on the windshield of the vehicle to the thin water film 13 evenly by the operation of the wiper blade 11, thereby securing the visibility of the driver. However, in a glass coated with water wax by automatic washing or self-washing, it is impossible to form a water film which is useful for wiper 10 operation. When a wiper blade is operated due to a non-uniformly formed wax layer, Respectively. 1 is a photograph of a non-uniform wax coating film formed on a windshield 15 of a vehicle. As shown in FIG. 1, it can be confirmed that a non-uniform wax coating film is formed on the front glass due to the use of water wax in the case of automatic washing or the like.

2 is a cross-sectional view of the case where the wiper is operated upon formation of a uniform water film 13 according to the prior art. When a uniform water film 13 is formed as shown in FIG. 2, uniform friction occurs between the surface of the glass 15 and the wiper blade 11, so that the normal wiper motion is reduced with less noise and vibration. However, when automatic washing or self-washing is performed, the wax coating liquid is applied to the windshield of the vehicle. 3 is a cross-sectional view of the wiper 10 when the uneven water film 19 is formed according to the prior art. When the wax coating liquid is applied to the front glass, a non-uniform water film 19 is formed as shown in FIG. 3. As a result, uneven friction occurs between the surface of the glass 15 and the wiper blade 11, .

Disclosure of Invention Technical Problem [8] The present invention has been conceived to solve the above-mentioned problems, and it is an object of the present invention to provide a coating composition for use in an automotive wiper blade (11), which, when applied to glass coated with water wax due to automatic washing or self- It is an object of the present invention to effectively reduce tremor and improve durability performance. 4 is an enlarged cross-sectional view of the vehicle wiper 10, which is preferably coated on the wiper blade 11 of Fig.

The present invention relates to a coating composition comprising a fluorine resin binder, a solid lubricant, an additive and a solvent, wherein the additive is added with a solid spherical polymer fine powder (25) having excellent mechanical strength. Further, the spherical polymer fine powder is preferably any one of polymethylaylene adipamide having the following formula (1) or polynonamethylene terephthalamide having the following formula (2) or a mixture thereof.

5 is an enlarged view of the wiper blotting coating layer 17 according to the prior art. 5, the wiper blade 11 is in surface contact with the surface of the glass 15, so that when the wiper blade 11 is used for a long time, the wiper blade 11 wears, And increased noise. 7 is an enlarged view of the wiper blotting coating layer 17 according to the prior art, in which the graphite coating layer 21 of the wiper blot is flat and in surface contact with the glass surface. On the other hand, in the present invention, the additive includes the spherical polymer fine powder (25) and makes point contact with the glass surface. 6 is an enlarged view of a wiper blast coating layer according to an embodiment of the present invention. As shown in FIG. 6, the spherical polymer fine powder 25 is contained in the graphite coating layer 23 to provide an environment for point contact. 8 is an enlarged view of a wiper blot coating layer according to an embodiment of the present invention. As shown in FIG. 8, the wiper blade coated according to the present invention can confirm that the spherical polymer fine powder 25 protrudes from the creping coating layer 23 on the wiper rubber 21. The spherical polymer fine powder 25 protruding as shown in FIG. 8 is converted into point contact with the surface of the glass 15 differently from the surface contact with the surface of the glass 15, thereby reducing the shaking phenomenon and noise on the glass surface coated with the wax, And the durability is improved because the strength is excellent.

More specifically, the glass coated with water wax by automatic washing or self-washing does not form a water film which is useful for the operation of the wiper 10. Further, when the wiper blade 11 is operated due to the wax layer formed on the front glass of the vehicle unevenly, there is a problem that the noise and the vibration are generated. In order to solve the above problems, in order to realize a uniform friction coefficient in order to cope with a vibration phenomenon and noise caused by a difference in friction coefficient between the glass surface and the wiper blade 11, And silicone resin are applied. However, when the wiper blade 11 of the prior art is used for a long time, the durability of the wiper blade 11 is drastically reduced.

Accordingly, the present invention provides a method for manufacturing a glass wool blend, which comprises adding a spherical polymer fine powder (25) having an excellent mechanical strength and hardness, so that the contact between the glass (15) surface and the wiper blade It is possible to remarkably reduce the noise and the trembling phenomenon and to improve the durability by the coating ability of the spherical polymer fine powder 25. Therefore, the wiper 10 to which the present invention is applied can be used for a long period of time The chattering and the noise are not generated. In order to solve the above problems, it is preferable to use spherical polymer fine powder such as polymethylaylene adipamide and polynonamethylene terephthalamide as an additive in the present invention.

According to the present invention, there is provided a coating composition for a wiper blade comprising an organic solvent, a binder, a solid lubricant, and an additive containing a spherical polymer fine powder. In the present invention, the organic solvent is preferably 70 to 80% by weight. If the amount of the organic solvent is less than 70% by weight, the coating solution becomes clogged when the wiper blade coating solution of the present invention is sprayed. When the amount of the organic solvent is more than 80% by weight, the coating solution becomes uneven There is a problem. It is preferable that the organic solvent is any one of toluene or methyl ethyl ketone or a mixture thereof.

Further, in the present invention, the binder is preferably 10 to 15% by weight. If the binder is less than 10% by weight, the adhesive force between the rubber and the coating applied to the wiper blade 11 is lowered, and if it exceeds 15% by weight, the coating is broken. In addition, the binder is preferably a fluorine-based CAB-modified resin. In addition, in the present invention, it is preferable that the fluorine-based CAB modified resin is prepared by dissolving vinylidene fluoride hexafluoropropylene in methyl ethyl ketone to prepare a fluorine resin and adding cellulose acylate butyrate as a modifier.

Further, in the present invention, the solid lubricant is preferably 3 to 10% by weight. If the solid lubricant is less than 3% by weight, slip performance is insufficient and durability is deteriorated. When the solid lubricant is more than 10% by weight, the initial performance of the wiper is deteriorated. Further, it is preferable that the solid lubricant is any one or a mixture of two or more of graphite, polytetrafluoroethylene, or molybdenum disilicide.

In addition, in the present invention, the amount of the additive containing the spherical polymer fine powder is preferably 1 to 10% by weight. If the amount of the additive containing the spherical polymer fine powder is less than 1% by weight, the adhesive force between the rubber and the coating applied to the wiper blade 11 decreases. If the additive contains more than 10% by weight, the coating may break during long-term use. Preferably, the additive containing the spherical polymer fine powder (25) is either a silicone rubber powder or a silicone resin powder or a mixture thereof. The spherical polymer fine powder (25) is preferably a polymethylanene Diphenamide or polynonamethylene terephthalamide of formula (2), or a mixture thereof. The diameter of the spherical polymer fine powder (25) is preferably 2 to 5 占 퐉.

[Example]

Hereinafter, the present invention will be described in more detail with reference to Examples. It is to be understood by those skilled in the art that these embodiments are merely illustrative of the present invention and that the scope of the present invention is not construed as being limited by these embodiments.

The fluorine-based CAB modified resin of the present invention is prepared by dissolving vinylidene fluoride hexafluoropropylene in methyl ethyl ketone to prepare a fluorine resin, and then adding cellulose oxide acetate butylate as a modifier thereto. Further, the spherical polymer fine powder (25) contained in the additive is prepared by finely grinding the polymetaxylene adipamide resin powder into a ball mill for a certain period of time. Next, a fluorine-based CAB-modified resin, a binder, a solid lubricant and a curing agent are added, and the mixture is thermally cured at 130 ° C for 10 minutes. When the binder (polyol) and the diisocyanate are mixed, a urethane bond is formed, so that the spherical polymer fine powder 25 is attached to the surface without falling on the surface. A coating composition for a wiper blade according to the present invention was prepared with the composition shown in Table 1 below.

division Example 1
(weight%) Example 2
(weight%) Example 3
(weight%) Example 4
(weight%) Example 5
(weight%) Example 6
(weight%) Example 7
(weight%) Example 8
(weight%) Example 9
(weight%) Comparative Example 1
(weight%) Comparative Example 2
(weight%) Comparative Example 3
(weight%) Comparative Example 4
(weight%) bookbinder Fluorine-based CAB-modified resin 15 15 15 15 15 15 15 15 15 15 15 15 15 Solid lubricant Graphite 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 Polytetrafluoroethylene 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 Ehwa Malolivendium 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 additive Polymethylaylene adipamide 0.5 One 1.5 2 2.5 3 3.5 4 4.5 0 0 0 0 Silicone rubber powder 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 4.5 0.5 0 Silicone resin powder 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 4.5 0 Organic solvent toluene Balance Balance Balance Balance Balance Balance Balance Balance Balance Balance Balance Balance Balance Methyl ethyl ketone Sum 100 100 100 100 100 100 100 100 100 100 100 100 100

In Examples 1 to 9 of the composition as shown in Table 1, the spherical polymer fine powder (25) contained in the additive was added in increments of 0.5 to 4.5% by weight of polymethylaylene adipamide, Examples 1 to 4 did not include the polymethylaylene adipamide.

Thereafter, experiments for confirming the durability of the above-mentioned Examples 1 to 9 and Comparative Examples 1 to 4 were carried out. In this test, the test apparatus used for evaluating the performance of the wiper blade 11 was a test apparatus, spraying water uniformly at 0.8 to 2 L / min on the windshield 15 of the vehicle, and the operating speed of the wiper blade was 42 cycles / min . The durability test was evaluated by the jury evaluation score at the initial, 50,000, 100,000, and 200,000 times of operation, and at least 8 points at the initial test and at least 6 points after the operation at 200,000 times.

division Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 Example 9 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Early 9 points 9 points 9 points 9 points 9 points 9 points 9 points 8 points 9 points 9 points 7 points 7 points 9 points After 50,000 operations 8 points 8 points 8 points 8 points 8 points 8 points 8 points 8 points 7 points 8 points 5 points 5 points 7 points After 100,000 operations 7 points 7 points 7 points 7 points 7 points 7 points 7 points 7 points 6 points 6 points 4 points 4 points 6 points After 200,000 operations 6 points 6 points 6 points 6 points 7 points 7 points 7 points 7 points 7 points 5 points 5 points 7 points 4 points

Table 2 shows the results of the durability tests of Examples 1 to 9 and Comparative Examples 1 to 4. It can be confirmed that Embodiments 1 to 9 satisfy the above evaluation criteria. On the contrary, in Comparative Example 1, it is confirmed that the experiment after the operation of 200,000,000 times does not satisfy the criterion by 5 points. In addition, in Comparative Example 2, it can be confirmed that the initial test is 7 points and the experiment after 200 million times of operation does not satisfy the criteria of 5 points. In addition, in Comparative Example 3, it can be confirmed that the initial test is 7 points, which does not satisfy the criterion. Finally, in the comparative example 4, it is confirmed that the experiment after the operation of 200,000,000 times does not satisfy the criterion by 4 points.

In addition, an experiment was conducted to evaluate the vibration and noise of the wax-coated glass of Examples 1 to 9 and Comparative Examples 1 to 4 above. The evaluation was performed by operating the wiper 10 600,000 times, applying the wax to the glass surface of the vehicle, and operating for 30 minutes to evaluate the vibration and noise with the Jury evaluation score. The evaluation criteria were based on a score of 6 or more, and the results of the experiment are shown in Table 3 below.

division Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 Example 9 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 After 600,000 operations 6 points 6 points 6 points 6 points 7 points 7 points 7 points 7 points 7 points 5 points 5 points 7 points 4 points

As shown in Table 3, Examples 1 to 9 and Comparative Example 3 satisfied the evaluation criteria, but Comparative Example 1, Comparative Example 2 and Comparative Example 4 did not satisfy the above evaluation criteria.

Accordingly, the results of the above durability test and the evaluation of the vibration and noise of the glass coated with wax are compared with those of Comparative Examples 1 to 4 in comparison with Examples 1 to 9 showing durability and wax application It can be seen that the wiping phenomenon and noise of the wiper are remarkably reduced.

The present invention includes an additive containing a spherical polymer fine powder (25), thereby converting the contact between the glass surface and the wiper blade coating surface into surface contact in the glass (15), which has excellent mechanical strength and is coated with water wax, There is an effect that noise and vibration phenomena are reduced when the wiper 10 is operated and durability is improved by the ability of the spherical polymer fine powder 25 to be coated.

Although the present invention has been described in connection with the specific embodiments of the present invention, it is to be understood that the present invention is not limited thereto. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents. Various modifications and variations are possible.

10: Wiper
11: Wiper blade
13: Homogeneous water film
15: Glass
17: Coating layer
19: heterogeneous meninges
21: Wiper rubber
23: graphite coating layer
25: spherical polymer fine powder

Claims (12)

A coating composition for a wiper blade, comprising an organic solvent, a binder, a solid lubricant and an additive containing a spherical polymer fine powder.
The method according to claim 1,
Wherein the organic solvent is 70 to 80% by weight.
3. The method of claim 2,
Wherein the organic solvent is any one of toluene or methyl ethyl ketone or a mixture thereof.
The method according to claim 1,
Wherein the binder is 10 to 15% by weight.
5. The method of claim 4,
Wherein the binder is a fluorine-based CAB-modified resin.
6. The method of claim 5,
Wherein the fluorine-based CAB-modified resin is prepared by dissolving vinylidene fluoride hexafluoropropylene in methyl ethyl ketone to prepare a fluorine resin, and adding cellulose acylate butyrate as a modifier.
The method according to claim 1,
Wherein the solid lubricant is 3 to 10 wt%.
8. The method of claim 7,
Wherein the solid lubricant is any one or a mixture of two or more of graphite, polytetrafluoroethylene, or molybdenum disilicide.
The method according to claim 1,
And the additive containing the spherical polymer fine powder is 1 to 10% by weight.
The method according to claim 1,
Wherein the additive containing the spherical polymer fine powder is any one of silicone rubber powder or silicone resin powder or a mixture thereof.
11. The method of claim 10,
Wherein the spherical polymer fine powder is any one of polymethylaylene adipamide having the formula (1) or polynonamethylene terephthalamide having the formula (2), or a mixture thereof.

≪ Formula 1 >

(2)

11. The method of claim 10,
Wherein the spherical polymer fine powder has a diameter of 2 to 5 占 퐉.

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