WO2017039118A1 - Coating solution for surface treatment having stability of friction coefficient, corrosion resistance, and eco-friendly property, and method for preparing coating layer using same coating solution - Google Patents

Abstract

The present invention relates to a coating solution for surface treatment having stability of friction coefficient, corrosion resistance, and eco-friendly property, and to a method for preparing a coating layer using the coating solution. More specifically, a coating solution according to an embodiment of the present invention contains 13-17 wt% of (3-aminopropyl)triethoxysilane, 65-75 wt% of dipropylene glycol, 4-6 wt% of stearic acid, 13-15 wt% of tetraethoxysilane, 0.5-1 wt% of tetrabutyle titanate, and greater than 0 wt% and up to 0.5 wt% of tetraisopropyl titanate, and thus has an effect of simultaneously satisfying the stability of friction coefficient, corrosion resistance, and eco-friendly property.

Description

Friction Coefficient Stability, Corrosion Resistance and Eco-Friendly Surface Treatment Coating Solution, Manufacturing Method of Coating Layer Using the Coating Solution

The present invention relates to a friction coefficient stability, corrosion resistance and environmentally friendly surface treatment coating solution, a method for producing a coating layer using the coating solution.

The most commonly used metals in the current industrial field are steel structures containing iron (Fe), and most of them are exposed to natural environment (snow, rain, salt, temperature, humidity, oxygen, etc.), and thus prevent rust surface to enhance corrosion resistance and durability. It is common to do the treatment.

Corrosion of structures containing iron meets oxygen and moisture in the air to form Fe (OH) ₃ and Fe ₂ O ₃ , which are most often accelerated by other chemicals in the air, soot, salt in seawater, and acid rain. .

Recently, the need for surface treatment technology to improve durability and corrosion resistance is rapidly increasing due to the large-scale recall due to automobile corrosion and the offshore plant industry, and corrosion is directly related to safety accidents due to the reduction in strength and life as well as appearance.

1 shows a photo schematically showing a car and a cancer cell in which corrosion has occurred. And, Figure 2 shows a photograph of a hot-dip galvanized bolt is a conventional rust generated. As shown in Figure 1, corrosion has similarities with cancer cells in that it can destroy everything at the moment of occurrence.

As a representative surface plating method to block the external environment causing such corrosion, zinc plating is used to protect metals from corrosion in a wide range of fields. Zinc plating also has sacrificial anode protection because it has a greater tendency to ionize than iron in a cathodic manner.

However, zinc plating itself generates a lot of zinc oxide, and because of its low corrosion resistance, most of them are treated to be chemically stable through post-treatment. The methods mainly used for post-treatment include chromate and phosphate treatment. The chromate process uses hexavalent chromium (Cr ^{6 +} ), which requires an alternative to the hexavalent chromium due to deadly toxicity and environmental pollution.

In September 2000, the European Union launched the End of Life Vehicle Directive (ELV), which proposed limiting toxic heavy metals (such as Pb, Cd, Hg and hexavalent Cr) in the coating of automotive components. The European Union also issued a directive to prohibit the use of certain hazardous substances in all electronic equipment imported into the country on 1 July 2006.

Accordingly, as a method of replacing the hexavalent chromium surface treatment coating solution, many technologies have been developed and various attempts have been made. Among various alternative methods, chromate coating solution using trivalent chromium has emerged as an effective solution until now, but corrosion resistance, price competition, and user convenience have not been satisfied.

3 is a photograph of a finger addicted to heavy metal hexavalent chromium, and FIG. 4 is a photograph of a patient in which cancer is generated by a carcinogen.

As a coating method and a solution for preventing such corrosion, Korean Patent Laid-Open Publication No. 10-2015-0075001 (Surface treatment solution having excellent corrosion resistance and blackening resistance and a method of manufacturing a surface-treated Zn-Al-Mg alloy plated steel sheet using the same) ) Is a method for producing a surface treatment solution for providing excellent corrosion resistance to a zinc-aluminum-magnesium alloy steel sheet, and it has excellent corrosion resistance and has improved blackening resistance in which the surface of the film does not turn black even under high temperature and high humidity. Since chromium is used, it is not preferable because it is in a direction that is not in line with global environmental regulations.

In addition, the Republic of Korea Patent No. 1209079 (eco-friendly water-soluble anti-corrosive coating composition and environmentally friendly anti-corrosion coating method of steel structures using the same) relates to an eco-friendly water-soluble anti-corrosive coating composition and coating method to the steel structure environmentally friendly corrosion resistance, chemical resistance, durability It relates to a water-soluble paint that can give. The use of a mixture of water-soluble epoxy resins provided excellent corrosion resistance, but the coating film is very thick (50-75 μm), so its use is limited and the field of application is limited. In addition, the productivity is very low because curing takes longer than 8 hours after coating.

In addition, the Republic of Korea Patent No. 0579989 (torque stabilizer) relates to a stabilizer that provides a stable fastening force when assembling bolts, nuts, screws by mixing a modified alkyd resin, a water dispersible surfactant and an aqueous pigment in a certain component ratio. However, the variation of the friction coefficient due to the stabilizer was 14%. Since this is a very high deviation, it is unsuitable for process application, and thus, in the present invention, it was intended to develop a stabilizer at a level satisfying the 1-2%.

[Preceding technical literature]

[Patent Documents]

(Patent Document 1) Republic of Korea Patent Publication No. 2015-0075001

(Patent Document 2) Republic of Korea Registered Patent No. 1209079

(Patent Document 3) Republic of Korea Registered Patent No. 0579989

Therefore, the present invention has been made to solve the conventional problems as described above, according to an embodiment of the present invention, the object of the present invention is to provide a high stability and high corrosion resistance environmentally friendly surface treatment solution of the friction coefficient.

In addition, according to an embodiment of the present invention, because it is most suitable for galvanized metal base material and increases the corrosion resistance, chemical and friction coefficient stability, it can be very usefully applied in related fields (bolts, nuts, various fasteners, steel sheets, etc.) It is an object of the present invention to provide a method for producing a coating layer using the coating solution, the frictional coefficient stability, corrosion resistance and environment-friendly surface treatment coating solution.

On the other hand, the technical problems to be achieved in the present invention are not limited to the technical problems mentioned above, and other technical problems that are not mentioned are clearly to those skilled in the art from the following description. It can be understood.

A first object of the present invention is a friction coefficient stability, corrosion resistance and environmentally-friendly, characterized in that in the surface treatment coating solution, (3-aminopropyl) preethoxysilane, dipropylene glycol, stearic acid and tetraethoxysilane It can be achieved as a surface treatment coating solution.

Further, in the first object, 5 to 17% by weight of (3-aminopropyl) preethoxysilane, 50 to 75% by weight of dipropylene glycol, 1 to 6% by weight of stearic acid and 8 to 15% by weight of tetraethoxysilane It may be characterized by including.

And, for the first purpose, preferably, 13 to 17% by weight of (3-aminopropyl) preethoxysilane, 65 to 75% by weight of dipropylene glycol, 4 to 6% by weight of stearic acid and 13 to 13% of tetraethoxysilane It may be characterized by including 15% by weight.

A second object of the present invention, in the surface treatment coating solution, comprises (3-aminopropyl) preethoxysilane, dipropylene glycol, stearic acid, tetraethoxysilane, tetrabutyl titanate and tetraisopropyl titanate It can be achieved as a friction coefficient stability, corrosion resistance and environmentally friendly surface treatment coating solution characterized in that.

In addition, in the second object, 5 to 17% by weight of (3-aminopropyl) preethoxysilane, 50 to 75% by weight of dipropylene glycol, 1 to 6% by weight of stearic acid, 8 to 15% by weight of tetraethoxysilane, It may be characterized in that it comprises 0.5 to 1% by weight of tetrabutyl titanate and 0 to 0.5% by weight of tetraisopropyl titanate.

And, for the second purpose, preferably, 13 to 17% by weight of (3-aminopropyl) preethoxysilane, 65 to 75% by weight of dipropylene glycol, 4 to 6% by weight of stearic acid and 13 to 13% of tetraethoxysilane 15 wt%, tetrabutyl titanate 0.5-1 wt% and tetraisopropyl titanate greater than 0 to 0.5 wt%.

A third object of the present invention, in the method for producing a coating layer, the step of washing the surface of the metal base material to be subjected to the surface treatment to produce a coating layer; Immersing the base material in a container in which the coating solution according to claim 4 is stored; Removing the base material from the container and dehydrating the coating solution to uniformly apply the coating solution; And dry-curing the base material to form a coating layer. It can be achieved as a method of manufacturing a coating layer using a frictional coefficient stability, corrosion resistance, and environmentally friendly surface treatment coating solution, which comprises a.

In addition, in the third purpose, the washing may include removing foreign substances on the surface of the base material by acetone ultrasonic cleaning.

In addition, in the third purpose, the immersing step may be characterized in that the base material is immersed in the coating solution for 3 to 5 seconds by dipping (Dipping) method.

And, in the third purpose, the applying step, it may be characterized in that the dewatering means for 10 to 20 seconds by rotating to 200 ~ 1000rpm.

In addition, in the third purpose, the step of forming the coating layer, it may be characterized in that the dry curing at 100 ~ 130 ℃ for 15 to 35 minutes.

And, in a third purpose, after the step of forming the coating layer, it may be characterized in that it further comprises the step of cooling to a temperature of less than 60 ℃.

In addition, in the third object, the coating solution is (3-aminopropyl) preethoxysilane 5 to 17% by weight, dipropylene glycol 50 to 75% by weight, stearic acid 1 to 6% by weight, tetraethoxysilane 8 15 wt%, tetrabutyl titanate 0.5-1 wt% and tetraisopropyl titanate greater than 0 wt% to 0.5 wt%.

In addition, in the third object, preferably, the coating solution is 13 to 17% by weight of (3-aminopropyl) preethoxysilane, 65 to 75% by weight of dipropylene glycol, 4 to 6% by weight of stearic acid and tetra 13 to 15% by weight of oxysilane, 0.5 to 1% by weight of tetrabutyl titanate and 0 to 0.5% by weight of tetraisopropyl titanate.

A fourth object of the present invention, in the coating layer using the surface treatment coating solution, the coating layer using the friction coefficient stability, corrosion resistance and environmentally friendly surface treatment coating solution, characterized in that formed by the manufacturing method according to the above-mentioned third object Can be achieved as

Surface treatment coating solution according to an embodiment of the present invention, the method for producing a coating layer using the coating solution, has the effect of high stability and high corrosion resistance and environmentally friendly friction coefficient.

In addition, according to an embodiment of the present invention, it is most suitable for galvanized metal base material and can be very usefully applied in related fields (bolts, nuts, various fasteners, steel sheets, etc.) because it increases corrosion resistance, chemical and friction coefficient stability. Has an advantage.

On the other hand, the effect obtained in the present invention is not limited to the above-mentioned effects, other effects that are not mentioned will be clearly understood by those skilled in the art from the following description. Could be.

The following drawings, which are attached to this specification, illustrate one preferred embodiment of the present invention, and together with the detailed description thereof, serve to further understand the technical spirit of the present invention. It should not be construed as limited.

1 is a photo schematically showing a car and a cancer cell in which corrosion has occurred,

Figure 2 is a photograph of a hot dip galvanized bolt is conventional rust generated,

3 is a finger photo addicted to heavy metal hexavalent chromium,

4 is a photograph of a patient in which cancer is generated by a carcinogen,

5 is a ratio table of the environmentally friendly coating solution according to an embodiment of the present invention,

Figure 6 is a block diagram of a coating layer manufacturing method using an environmentally friendly coating solution according to an embodiment of the present invention,

7 is a flow chart of the coating layer manufacturing method using an environmentally friendly coating solution according to an embodiment of the present invention,

8 is a test result of the adhesion and corrosion resistance of the coating layer prepared by the coating solution prepared according to an embodiment of the present invention,

9 is an E-SEM analysis photograph of a conventional hot dip galvanized bolt,

10 is an E-SEM analysis photograph of a zinc-based surface treatment bolt surface treated with a coating solution according to Example 5 of the present invention;

11 is an EDX elemental analysis result table of a zinc-based surface treated bolt surface treated with a conventional hot dip galvanized bolt and a coating solution according to Example 5 of the present invention;

12 is a photograph after 1900 hours of the salt spray test of the conventional hot-dip galvanized bolts,

Figure 13 is a photograph after 1900 hours of salt spray test of zinc-based surface treatment bolt surface treatment with a coating solution according to Example 5 of the present invention,

Figure 14 shows a friction coefficient analysis result table of the zinc-based surface treatment bolt surface-treated with the coating solution according to an embodiment of the present invention.

Objects, other objects, features and advantages of the present invention will be readily understood through the following preferred embodiments associated with the accompanying drawings. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided so that the disclosure may be made thorough and complete, and to fully convey the spirit of the invention to those skilled in the art.

In the present specification, when a component is mentioned to be on another component, it means that it may be formed directly on the other component or a third component may be interposed therebetween. In addition, in the drawings, the thickness of the components are exaggerated for the effective description of the technical content.

Embodiments described herein will be described with reference to cross-sectional and / or plan views, which are ideal exemplary views of the present invention. In the drawings, the thicknesses of films and regions are exaggerated for effective explanation of technical content. Therefore, the shape of the exemplary diagram may be modified by manufacturing techniques and / or tolerances. Accordingly, the embodiments of the present invention are not limited to the specific forms shown, but also include changes in forms generated according to manufacturing processes. For example, the etched regions shown at right angles may be rounded or have a predetermined curvature. Thus, the regions illustrated in the figures have properties, and the shape of the regions illustrated in the figures is intended to illustrate a particular form of region of the device and is not intended to limit the scope of the invention. Although terms such as first and second are used to describe various components in various embodiments of the present specification, these components should not be limited by such terms. These terms are only used to distinguish one component from another. The embodiments described and illustrated herein also include complementary embodiments thereof.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In this specification, the singular also includes the plural unless specifically stated otherwise in the phrase. As used herein, the words 'comprises' and / or 'comprising' do not exclude the presence or addition of one or more other components.

In describing the specific embodiments below, various specific details are set forth in order to explain the invention more specifically and to help understand. However, those skilled in the art can understand that the present invention can be used without these various specific details. In some cases, it is mentioned in advance that parts of the invention which are commonly known in the description of the invention and which are not highly related to the invention are not described in order to prevent confusion in explaining the invention without cause.

<Configuration of eco-friendly coating solution according to the embodiment>

Surface treatment coating solution according to an embodiment of the present invention, including (3-aminopropyl) preethoxysilane, dipropylene glycol, stearic acid, tetraethoxysilane, tetrabutyl titanate and tetraisopropyl titanate, friction Coefficient stability, corrosion resistance and environmental friendliness are all satisfied.

Specifically, the coefficient of friction stability, corrosion resistance and environmentally friendly surface treatment coating solution is (3-aminopropyl) preethoxysilane 5 to 17% by weight, dipropylene glycol 50 to 75% by weight, stearic acid 1 to 6% by weight, tetraethoxy 8-15 weight percent silane, 0.5-1 weight percent tetrabutyl titanate and 0-0.5 weight percent tetraisopropyl titanate.

More preferably, 13 to 17% by weight of (3-aminopropyl) preethoxysilane, 65 to 75% by weight of dipropylene glycol, 4 to 6% by weight of stearic acid and 13 to 15% by weight of tetraethoxysilane, tetrabutyltita 0.5 to 1% by weight of nate and greater than 0 to 0.5% by weight of tetraisopropyltitanate.

Figure 5 shows the ratio table of the environmentally friendly coating solution according to an embodiment of the present invention. As shown in Figure 5, in Example 1 of the present invention, 5 to 7% by weight of (3-aminopropyl) preethoxysilane, 50 to 55% by weight of dipropylene glycol, 1-2% by weight of stearic acid and tetra It can be seen that it is composed by mixing 8 to 9% by weight of oxysilane, 0.5 to 1% by weight of tetrabutyl titanate and 0 to 0.5% by weight of tetraisopropyl titanate.

In addition, as shown in Figure 5, in Example 2 of the present invention, 7 to 10% by weight of (3-aminopropyl) preethoxysilane, 55 to 60% by weight of dipropylene glycol, 2-3% by weight of stearic acid and It can be seen that 9 to 10 wt% of tetraethoxysilane, 0.5 to 1 wt% of tetrabutyl titanate, and 0 to 0.5 wt% of tetraisopropyl titanate are mixed.

As shown in Figure 5, in Example 3 of the present invention, 10 to 13% by weight (3-aminopropyl) preethoxysilane, 60 to 65% by weight dipropylene glycol, 3 to 4% by weight stearic acid and tetra It can be seen that it is composed by mixing 9 to 10% by weight of oxysilane, 0.5 to 1% by weight of tetrabutyl titanate and 0 to 0.5% by weight of tetraisopropyl titanate.

In addition, as shown in Figure 5, in Example 4 of the present invention, 13 to 15% by weight of (3-aminopropyl) preethoxysilane, 65 to 70% by weight of dipropylene glycol, 4 to 5% by weight of stearic acid and It can be seen that 11 to 13% by weight of tetraethoxysilane, 0.5 to 1% by weight of tetrabutyl titanate and 0 to 0.5% by weight of tetraisopropyl titanate.

And, as shown in Figure 5, in Example 5 of the present invention, 15 to 17% by weight of (3-aminopropyl) preethoxysilane, 70 to 75% by weight of dipropylene glycol, 5 to 6% by weight of stearic acid and It can be seen that 13-15% by weight of tetraethoxysilane, 0.5-1% by weight of tetrabutyl titanate and 0 to 0.5% by weight of tetraisopropyl titanate.

Eco-friendly metal surface coating solution according to an embodiment of the present invention to propose a direction to improve the environmental and economic problems as a technology to replace the chromate, etc. to prepare for the environmental problems of the recent RoHS (hazardous substance use regulation) do.

The eco-friendly metal surface coating solution of the present invention mainly consists of silane-based compounds having a structure of R'Si (OR) 3 and has excellent corrosion resistance by forming a film on various metals such as magnesium alloy, steel, and metal surface-treated with zinc. Among them, metals surfaced with zinc are most suitable.

The performance of the eco-friendly metal surface coating solution according to an embodiment of the present invention is to form a self-assembled film by forming a Si-OM bond and Si-O-Si as a film forming mechanism of the silane compound on the metal surface of the external environment Provides excellent corrosion resistance by protecting the base material from corrosion factors.

As shown in Figure 5, (3-aminopropyl) triethoxysilane plays the most preferred role to provide a strong adhesion between the coating solution and the metal base material. And tetraethoxysilane is most preferable in order to form a stable film.

In addition, tetrabutyl titanate, tetraisopropyl titanate, and stearic acid were mixed as the corrosion resistance increasing additive, and as a solvent, a combination of dipropylene glycol showed the best corrosion resistance performance.

<Coating layer manufacturing method>

Hereinafter will be described a method of manufacturing a metal surface coating layer according to an embodiment of the present invention. This coating layer is to use the above-mentioned friction coefficient stability, corrosion resistance and environmentally friendly surface treatment coating solution.

Figure 6 shows a block diagram of a coating layer manufacturing method using an environmentally friendly metal surface coating solution according to an embodiment of the present invention. And, Figure 7 shows a flow chart of a coating layer manufacturing method using an environmentally friendly metal surface coating solution according to an embodiment of the present invention.

In addition, the coating layer manufacturing method according to an embodiment of the present invention, as shown in Figure 6 and 7, washing the surface of the metal base material to be subjected to the surface treatment to generate the coating layer (S1) and the washed base material The step (S2) and the step of immersing the eco-friendly metal surface coating solution according to the embodiment of the present invention stored in the container and the dehydration by removing the base material from the container (S3) and the base material uniformly It can be seen that it comprises the step (S4) to form a coating layer by dry curing.

As mentioned above, the coating solution according to an embodiment of the present invention for producing a coating layer is 5 to 17% by weight of (3-aminopropyl) preethoxysilane, 50 to 75% by weight of dipropylene glycol, 1 to 1 part of stearic acid. 6% by weight, 8-15% by weight of tetraethoxysilane, 0.5-1% by weight of tetrabutyl titanate and 0-0.5% by weight of tetraisopropyl titanate.

More preferably, the coating solution according to an embodiment of the present invention, (3-aminopropyl) preethoxysilane 13-17 wt%, dipropylene glycol 65-75 wt%, stearic acid 4-6 wt% and tetraethoxy 13-15 weight percent silane, 0.5-1 weight percent tetrabutyl titanate and 0-0.5 weight percent tetraisopropyl titanate.

In addition, the washing step, as a pretreatment process, to perform acetone ultrasonic cleaning for about 1 minute to remove foreign substances on the surface of the galvanized base material.

In addition, in the immersing step, in order to coat the coating solution on the washed base material, the base material is immersed in the coating solution for 3 to 5 seconds by a dipping method.

In the applying step, the dehydration means is rotated at an rpm suitable for each base material between 200 and 1000 rpm to dehydrate for about 15 seconds to be evenly applied.

In addition, in the step of forming the coating layer, after coating the coating solution, it is dried and cured at about 100 ~ 130 ℃ for about 15 to 35 minutes to form a coating layer.

The coating process according to the embodiment of the present invention has an advantage of entering the factory site and worker efficiency because it can be easily and easily carried out for mass production application.

In addition, after the step of forming the coating layer, no special post-treatment is required, and the dry cured finished product is cooled to a temperature below 60 ° C.

<Experimental data>

Hereinafter, the results of adhesion performance, corrosion resistance, surface analysis, surface composition analysis, coefficient of friction analysis for the coating layer produced using the coating solution prepared according to Examples 1, 2, 3, 4, 5 of the present invention Explain.

Stearic acid and ethanol were purchased from Samjeon Pure Chemical Co., Ltd., (3-aminopropyl) triethoxysilane and tetraethoxysilane were obtained from isomeric materials. Propylene glycol was purchased from SKC, tetrabutyl titanate was purchased from Sigma Aldrich, and tetraisopropyl titanate was purchased from UCP Corporation.

First, in order to test the coating layer adhesion of the coating product according to an embodiment of the present invention was carried out in accordance with ASTM D 3002, D 3359. The performance grade is evaluated as ASTM class 5B ~ 1B and shows that the area separated by 5B is smaller and the adhesion is excellent.

◎: ASTM class 5B

○: ASTM class 4B

△: ASTM class 3B

×: ASTM class 1, 2B

In addition, the salt spray test analysis was carried out in accordance with KS D 9502 in a standardized manner, this specification is sprayed 5% NaCl solution at 35 ℃, the temperature in the chamber is maintained at 35 ℃ corrosion resistance experiments. After 1,000 hours of salt spray test, the corrosion resistance performance was evaluated by the ratio of hematite generation area.

◎: Red blue color occurrence area 0% or less

○: 5% or less of red blue color

△: red blue occurrence area 15% or less

×: 15% or more of red blue color generating area

Figure 8 shows the adhesion and corrosion resistance test results of the coating layer prepared by the coating solution prepared according to an embodiment of the present invention.

As shown in FIG. 8, the adhesion performance of the coating solution _1 to the coating solution _5 according to Example 1 according to the coating solution composition range condition according to the embodiment of the present invention was applied to the coating solution _1 coating. Except for showing excellent adhesion performance. Among them, it was confirmed that the adhesion performance of the coating solution _4 and the coating solution _5 had the most excellent quality.

In addition, the coating solution corrosion resistance performance measurement results according to the embodiment of the present invention, coating solutions 1 to 3 according to Examples 1 to 3 showed a red blue redness of less than 5% of the total area after the salt spray test 1,000 hours, Coating solution _4 and coating solution _5 according to Examples 4 to 5 showed a red blue red color development rate of less than 0% of the total area it was confirmed that it has excellent corrosion resistance.

In addition, the experimental data of the present invention observed the morphological changes of the coating surface. In order to observe the morphological change of the surface after the surface treatment with an environmentally friendly coating solution according to Examples 1 to 5 of the present invention was precisely analyzed by E-SEM.

9 shows an E-SEM analysis photograph of a conventional hot dip galvanized bolt. 10 shows E-SEM analysis photographs of zinc-based surface treatment bolts surface-treated with a coating solution (coating solution_5) according to Example 5 of the present invention.

As shown in Figure 9 and 10, the surface image was confirmed at a magnification of 1,000 times, and it was confirmed that a dense and uniform coating surface was formed in the product treated with the coating solution_5 compared with before coating.

In addition, the experimental data of the present invention analyzed the components of the coating surface. After the surface treatment with an environmentally friendly coating solution according to an embodiment of the present invention, the components were analyzed through EDX to confirm the components of the surface of the coating layer. 11 is a table showing EDX elemental analysis results of zinc-based surface treatment bolts surface-treated with a conventional hot dip galvanized bolt and a coating solution_5 according to Example 5 of the present invention.

As shown in FIG. 11, 9.52% of the Si content of the coating solution was detected in the hot dip galvanized bolts coated with the coating solution_5, thereby confirming the film forming effect of the coating solution.

12 shows a photograph after 1900 hours of a salt spray test of a conventional hot dip galvanized bolt. And, Figure 13 shows a photograph after a salt spray test 1900 hours of zinc-based surface treatment bolts surface-treated with a coating solution according to Example 5 of the present invention.

As shown in Figure 12 and 13, after the surface treatment with an environmentally friendly coating solution was observed for 1900 hours salt spray test for corrosion resistance analysis. A large amount of red rust was detected in the control product without surface treatment, whereas red rust was not found in the product treated with the coating solution _5 according to Example 5, and thus excellent corrosion resistance was confirmed.

Figure 14 shows a friction coefficient analysis result table of the zinc-based surface treatment bolt surface-treated with the coating solution according to an embodiment of the present invention. As shown in Figure 14, the friction coefficient k is obtained by the formula T = kDN (T = torque, D = nominal diameter, N = axial force) and friction due to the coating solution according to Examples 1 to 5 of the present invention As the coefficient remained stable, it was confirmed that the deviation was small. Among them, coating solution _5 according to Example 5 showed the lowest friction coefficient deviation, which showed very satisfactory results as a stabilizer.

In addition, the above-described apparatus and method may not be limitedly applied to the configuration and method of the above-described embodiments, but the embodiments may be selectively combined in whole or in part in each of the embodiments so that various modifications may be made. It may be configured.

Claims (15)

1. In the surface treatment coating solution,

   A friction coefficient stability, corrosion resistance and environmentally friendly surface treatment coating solution comprising (3-aminopropyl) preethoxysilane, dipropylene glycol, stearic acid and tetraethoxysilane.
2. The method of claim 1,

   Coefficient of friction characterized in that it comprises 5 to 17% by weight of (3-aminopropyl) preethoxysilane, 50 to 75% by weight of dipropylene glycol, 1 to 6% by weight of stearic acid and 8 to 15% by weight of tetraethoxysilane. Stability, corrosion resistance and eco-friendly surface coating coating solution.
3. The method of claim 2,

   Friction coefficient comprising 13 to 17% by weight of (3-aminopropyl) preethoxysilane, 65 to 75% by weight of dipropylene glycol, 4 to 6% by weight of stearic acid and 13 to 15% by weight of tetraethoxysilane Stability, corrosion resistance and eco-friendly surface coating coating solution.
4. In the surface treatment coating solution,

   Coefficient of friction stability, corrosion resistance and eco-friendly surface treatment coating solution comprising (3-aminopropyl) preethoxysilane, dipropylene glycol, stearic acid, tetraethoxysilane, tetrabutyl titanate and tetraisopropyl titanate .
5. The method of claim 4, wherein

   (3-aminopropyl) preethoxysilane 5 to 17% by weight, dipropylene glycol 50 to 75% by weight, stearic acid 1 to 6% by weight, tetraethoxysilane 8 to 15% by weight, tetrabutyl titanate 0.5 to 1% by weight Friction coefficient stability, corrosion resistance and environmentally friendly surface treatment coating solution, characterized in that it comprises more than 0% to 0.5% by weight of tetraisopropyl titanate.
6. The method of claim 5,

   (3-aminopropyl) preethoxysilane 13-17 wt%, dipropylene glycol 65-75 wt%, stearic acid 4-6 wt% and tetraethoxysilane 13-15 wt%, tetrabutyl titanate 0.5-1 wt Friction coefficient stability, corrosion resistance and environmentally friendly surface treatment coating solution, characterized in that it comprises more than 0% to 0.5% by weight of tetraisopropyl titanate.
7. In the coating layer manufacturing method,

   Washing the surface of the metal base material to be subjected to the surface treatment to produce the coating layer;

   Immersing the base material in a container in which the coating solution according to claim 4 is stored;

   Removing the base material from the container and dehydrating the coating solution to uniformly apply the coating solution; And

   Drying curing the base material to form a coating layer; Coating layer manufacturing method using a friction coefficient stability, corrosion resistance and environmentally friendly surface treatment coating solution comprising a.
8. The method of claim 7, wherein

   The washing step,

   Method for producing a coating layer using a friction coefficient stability, corrosion resistance and environmentally friendly surface treatment coating solution, characterized in that to remove foreign substances on the surface of the base material by acetone ultrasonic cleaning.
9. The method of claim 8,

   The immersion step,

   Method of producing a coating layer using a friction coefficient stability, corrosion resistance and environmentally friendly surface treatment coating solution, characterized in that the base material is immersed in the coating solution for 3 to 5 seconds by a dipping method.
10. The method of claim 9,

    The applying step,

    Method for producing a coating layer using a friction coefficient stability, corrosion resistance and environmentally friendly surface treatment coating solution, characterized in that the dehydration means by rotating at 200 ~ 1000rpm for 10 ~ 20 seconds dehydration.
11. The method of claim 10,

    Forming the coating layer,

    Method for producing a coating layer using a friction coefficient stability, corrosion resistance and environmentally friendly surface treatment coating solution, characterized in that the drying and curing at 100 ~ 130 ℃ for 15 to 35 minutes.
12. The method of claim 11,

    After forming the coating layer,

    Method for producing a coating layer using a friction coefficient stability, corrosion resistance and environmentally friendly surface treatment coating solution, further comprising the step of cooling to a temperature of less than 60 ℃.
13. The method of claim 7, wherein

    The coating solution,

    (3-aminopropyl) preethoxysilane 5 to 17% by weight, dipropylene glycol 50 to 75% by weight, stearic acid 1 to 6% by weight, tetraethoxysilane 8 to 15% by weight, tetrabutyl titanate 0.5 to 1% by weight Method for producing a coating layer using a friction coefficient stability, corrosion resistance and environmentally friendly surface treatment coating solution, characterized in that it comprises more than 0% and 0.5% by weight of tetraisopropyl titanate.
14. The method of claim 13,

    The coating solution,

    (3-aminopropyl) preethoxysilane 13-17 wt%, dipropylene glycol 65-75 wt%, stearic acid 4-6 wt% and tetraethoxysilane 13-15 wt%, tetrabutyl titanate 0.5-1 wt Method for producing a coating layer using a friction coefficient stability, corrosion resistance and environmentally friendly surface treatment coating solution, characterized in that it comprises more than 0% and 0.5% by weight of tetraisopropyl titanate.
15. In the coating layer using the surface treatment coating solution,

    A coating layer using a friction coefficient stability, corrosion resistance and environmentally friendly surface treatment coating solution, characterized in that formed by the manufacturing method according to any one of claims 7 to 13.

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