KR20180114800A - High bardness hybrid resine surface coating composition based on epoxy binder - Google Patents

Abstract

The present invention relates to a high hardness hybrid resin surface coating composition based on an epoxy binder. Specifically, the present invention relates to a high hardness hybrid resin surface coating composition based on an epoxy binder, which is coated on a surface of a component requiring high surface hardness such as automobile brake pad liner, thereby making surface hardness of the component high up to 250 Vickers hardness (Hv) or more.

Description

TECHNICAL FIELD [0001] The present invention relates to a high hardness hybrid resin surface coating composition based on an epoxy binder,

The present invention relates to a high hardness hybrid resin surface coating composition based on an epoxy binder, and more particularly to a surface hardness coating composition which is coated on a surface of a component requiring high surface hardness such as a brake pad liner for a vehicle, Hardness hybrid resin surface coating composition based on an epoxy binder capable of realizing a hardness of 250 Hv (Vickers Hardness) or higher.

Recently, various materials for the parts industry such as automobiles, shipbuilding, and precision industries have diversified into multifunctional, lightweight, and new materials, and accordingly, various surface modification coatings have been required. In other words, there is a great demand for functional coatings suitable for the characteristics of each industry and material. Particularly, there is a tendency to demand economical efficiency in addition to the stiffening of the coating surface. Accordingly, it is necessary to develop a coating raw material and to develop an efficient coating process of the parts corresponding thereto. In particular, there is an increasing demand for high-hardness coating products for vehicle parts companies specialized in automotive parts.

Currently, most of the raw materials used in the high hardness coating field of automobile parts are imported and used domestically, and competition is intensifying for enhancing the performance of the automotive coating parts at home and abroad and preempting the price competitiveness. In particular, most of the companies that are coating domestic automobile parts and related parts of industry are very small scale, and therefore, the use of low production efficiency coating process limits the cost reduction of coating products. Therefore, in order to ensure coating quality and cost competitiveness internationally, it is inevitable to develop a resin composition capable of higher efficiency and lower cost than existing processes.

The present invention provides a high hardness hybrid resin surface coating composition based on an epoxy binder capable of remarkably improving surface hardness in comparison with existing coating parts in order to solve the above problems.

The high hardness hybrid resin surface coating composition based on an epoxy binder according to the present invention comprises 10 to 14% by weight of DGEBA (Diglycidyl ether of bisphenol A), 3 to 7% by weight of melamine formaldehyde, 1 to 2% by weight of phenolic hardener, 1 to 2% by weight of DICY (Dicyandiamide), 1 to 2% by weight of 2-methyl imidazole, 1 to 2% by weight of dimethylaminomethylphenol 13 to 17 wt% of acetone, 9 to 13 wt% of MEK (Methy Ethyl Ketone), 9 to 13 wt% of N-butanol, 3 to 5 wt% of EGM (Ethylene Glycol Monobutyl Ether) 5 to 7% by weight of 2-ethoxy ethyl acetate, 7 to 9% by weight of cyclohexanone, 4 to 8% by weight of polytetrafluoroethylene, 4 to 8% by weight of carbon black, 3 to 5% by weight of graphite, 1 to 2% by weight of polyethylene glycol (PEG), 1-methoxy-2-propanol acetic acid, propanol wherein the phenolic curing agent is selected from the group consisting of 2 to 4% by weight of a phenol based resin, 2 to 4% by weight of a phenol based resin, 0.5 to 1% by weight of a wetting agent, 0.1 to 0.3% by weight of a deforming agent, and 0.1 to 0.3% Phenolic Hardener) is made of phenolic novolac (PN) (Novolac type epoxy resin), the wetting agent is made of fluorine denaturalization, the defoaming agent is non silicon type, And the anti-settling agent is of a polyamide type.

The surface coating with the high hardness hybrid resin surface coating composition based on the epoxy binder of the present invention having the above-mentioned constitution can greatly improve the required performance compared to the existing coating parts which are limited in the property enhancement It becomes.

Particularly, it is possible not only to improve the surface hardness of coated parts to a high hardness (about 250 Hv or more) of about 342 Hv, but also to improve the physical properties such as abrasion resistance (less than 45 mg) and friction coefficient (static: 0.9 to 1.5) , And the chemical properties can be improved.

In addition, the present invention is expected to provide a base for developing high quality and low cost localized raw materials. The hybrid resin composition having high hardness and abrasion resistance to be developed is mainly used for the surface of alloy materials such as SUS, Al, Mg and Nb It can also be used for stiffening.

In addition, due to the development of a local coating agent for liquid coating, it becomes possible to develop a liquid coating agent at a cost that is 20 to 30% or more lower than the cost of the imported coating agent.

Hereinafter, the hybrid resin composition for a vehicle according to the present invention will be described in detail.

The high hardness hybrid resin surface coating composition based on the epoxy binder according to the present invention can improve the surface hardness of coated parts to a high hardness of 250 Hv (Vickers Hardness) or higher, and can be used as a brake pad liner for a vehicle. Such as a high surface hardness.

That is, the surface hardness hybrid resin surface coating composition based on the epoxy binder according to the present invention can remarkably improve the surface hardness of the coated component as compared with the conventional surface coating composition, The composition of a conventional surface coating agent may be composed of a surface coating composition for achieving high hardness based on an epoxy binder and each of the surface coating compositions may be included in a content ratio for achieving high hardness.

Specifically, the high-hardness hybrid resin surface coating composition based on the epoxy binder according to the present invention can be used as a base polymer, a hardener and a catalyst, a solvent and a thinner, a solid A lubricant, surfactants, and a dispersant.

Here, the base polymer of the composition according to an embodiment of the present invention comprises 10 to 14% by weight of diglycidyl ether of bisphenol A (C ₂₁ H ₂₄ O ₄ ) composed of an epoxy resin, melamine formaldehyde, (C ₃ H ₆ N ₆ ) 3 to 7% by weight.

The above-mentioned epoxy resin has a strong adhesive force with the material because it is rich in an epoxy group as a functional group and an OH group. In addition, the benzene structure is excellent in mechanical properties and chemical resistance properties, has a relatively good heat resistance characteristic, and the ether structure functions to impart chemical resistance and flexibility.

The above-mentioned DGEBA varies greatly in physical properties before and after the coating film depending on the content of the base polymer. Therefore, the content of the DGEBA is adjusted within a range of 10 to 14% by weight so as to be suitable for final quality performance (surface hardness, heat resistance, abrasion resistance, lubricity, etc.).

The melamine formaldehyde has a large surface hardness and good lubricity, and is similar to a phenolic resin in water resistance and heat resistance. Furthermore, the above-mentioned melamine formaldehyde has excellent chemical resistance, less shrinkage and expansion of molding, and good electric arc resistance.

Since the melamine of the melamine formaldehyde has three amino groups, it is compatible with the epoxy resin for heating crosslinking and hardening, and thus it improves the physical properties of the coating film. The melamine resin has excellent adhesiveness, hardness, , Water resistance, reactivity, and chemical resistance.

The melamine formaldehyde is mixed with an epoxy, phenol, or polyamideimide having a large content of hydroxyl groups, which is a reactive functional group, and has an effect of improving overall physical properties.

When the weight percentage of the melamine formaldehyde exceeds 7% by weight, the surface after curing becomes uneven and rough. This is presumably due to the unreacted melamine after reaction with the epoxy.

When the weight percentage of the melamine formaldehyde was 3 to 7% by weight, good thermal stability was exhibited, and it exhibited the best properties in terms of cross cutting, surface hardness and surface roughness, which are curing qualities.

Meanwhile, the curing agent and the catalyst of the composition according to an embodiment of the present invention may contain 1 to 2% by weight of a phenolic hardener, 1 to 2% by weight of DICY (Dicyandiamide) (C ₂ H ₄ N ₄ ) - it made of methyl imidazole (2-methyl imidazole) (C 4 H 6 N 2) 1 ~ 2 % by weight of dimethyl amino methyl phenol _{(Dimethylaminomethylphenol) (C 15 H 27} N 3O) 1 ~ 2 % by weight.

The phenolic curing agent serves to make a two-dimensional linear material react with a three-dimensional network structure so as to be chemically stable. Further, when the thermoplastic resin reacts with the curing agent, the thermoplastic resin is converted into a thermosetting resin.

The phenolic curing agent may be a phenol novolac (PN), which is an epoxy resin of Novolac type. The novolak type phenol novolac (PN) As an excellent curing agent, it is used as a phenolic curing agent in the composition according to the present invention.

The DICY, the 2-methylimidazole and the dimethylaminomethylphenol correspond to a curing agent which can be stored for a long period of time in a state mixed with an epoxy resin in advance and which initiates a curing reaction when heated later .

The composition according to the present invention is suitable for the production of structural adhesives for automobiles, paints and the like because it can form a one-component epoxy coating composition by using the above-mentioned latent curing agent. Here, the one-liquid epoxy coating composition is easy to handle in metering and mixing at the time of use, and can automate the coating process of the coating material, so that the production efficiency is high and it has an advantage that it can be stored for a long period of time.

The latent curing agent has a functional group that reacts with an epoxy group and exhibits latency because the compound has a low solubility at room temperature in the epoxy resin. The latent curing agent is one of the solid dispersion-heat curing type latent curing agents, and exhibits various properties by changing the structures of imidazole compounds and amine compounds as raw materials. Therefore, the latent curing agent may be used as a curing agent or curing agent for one- It has excellent properties as an accelerator. The solid dispersion type curing agent reacts with the epoxy resin from the surface particles by heating and dissolves and diffuses in the epoxy resin while reacting to obtain a uniform cured product.

The DICY corresponds to a catalyst-type latent-type high-temperature curing agent and is a colorless crystalline material, which is slightly soluble in water and is well soluble in liquid ammonia. It is excellent in latency, so that solid curing agent is dissolved in a solvent and mixed in a resin or suspended in a liquid resin.

The DICY has a considerably long pot life and reacts rapidly (about 1.5 hrs) at about 145 to 165 ° C to obtain a cured product having excellent performance, and thus can be usefully used as a latent curing agent in the production of one-liquid epoxy coatings.

The 2-methylimidazole corresponds to a latent low temperature curing catalyst. Here, the one-component epoxy resin composition comprising the imidazoline duct type latent polymer curing agent has a small difference between the reaction initiation temperature and the reaction termination temperature, so that the reaction rate is fast and the storage stability is good.

The dimethylaminomethylphenol decreases the free volume between the main cross links and increases the packing efficiency, thereby increasing the intermolecular attraction between the polymer main chains, thereby exhibiting improved thermal expansion characteristics . That is, it exhibits a low CTE (Coefficient of Thermal Expansion), thereby exhibiting improved heat resistance, specifically, improved dimensional stability and processability due to temperature rise. As a result, the dimethylaminomethylphenol may have an interpenetrating cross-linking structure, and may be used alone or in combination of two or more.

The content of each of the phenolic curing agent, DICY, the 2-methylimidazole and the dimethylaminomethylphenol constituting the catalyst and the curing agent is relatively higher or lower than the content range according to the present embodiment as described above As a result of the cross cutting test, the adhesion rate was 50% or less, and when the surface was scratched with a pencil hardness of 1 kg.f, the 4H pencil peeled off.

Meanwhile, the solid lubricant of the composition according to an embodiment of the present invention comprises 4 to 8% by weight of polytetrafluoroethylene (PTFE) ((C ₂ F ₄ ) n), carbon black 4 To 8% by weight of graphite, and 3 to 5% by weight of graphite.

The fluororesin such as PTFE is superior in heat resistance to other thermosetting resins and is stable at high temperatures and does not change its properties. It has a very low coefficient of friction and excellent lubricity due to its unique non-tackiness, and has excellent abrasion resistance, And it has corrosion resistance. Therefore, when a fluororesin having such characteristics is added to an epoxy resin, the surface coating composition can be further improved in performance.

Among the above-mentioned fluororesin, the PTFE has a relatively high heat-resistant temperature, excellent mechanical properties, and particularly excellent dynamic friction coefficient of 0.10. Furthermore, the electrical resistivity is more than 10 < ^{18 &} gt ;, and the chemical resistance and acid resistance are good.

The physical properties before and after the coating film differ depending on the content of the PTFE. In other words, not only does it affect the dispersion stability during dispersion, but also the wettability of the parts before curing and the surface hardness after surface hardening and the surface lubricity are closely related.

Particularly, in the composition according to an embodiment of the present invention, the amount of the DGEBA and the PTFE is very important. If the blending amount is appropriate, the adhesive strength with the material is good, the surface hardness after curing and the bending resistance are excellent, and the acid resistance is improved.

For example, when the amount of the DGEBA added is relatively large, the content of the PTFE becomes relatively small, which causes a decrease in heat resistance after curing, and furthermore, the weatherability is weakened by the increase of the benzene structure. On the other hand, if the content of DGEBA is relatively small, the adhesive force due to the weakening of the wetting force with the metal material is lowered, and the tensile strength and flexural modulus after curing are weakened, resulting in surface cracking.

Accordingly, the composition according to one embodiment of the present invention is excellent in adhesion to a material through the blending of 10 to 14% by weight of the DGEBA and 4 to 8% by weight of the PTFE, and has excellent surface hardness and flexural resistance after curing, A resin composition having good acid resistance can be provided.

In the case of the present embodiment, the composition added with 4 to 8 wt% of PTFE showed the best result in heat resistance, abrasion resistance, and surface roughness. If the blending amount of the PTFE content exceeds 8 wt% Further, after curing, the degree of curing polymerization of the above-mentioned DGEBA is lowered, and the tensile strength and flexural modulus decrease. On the other hand, when the content of DGEBA is less than 4% by weight, the utilization properties of the PTFE have deteriorated, and the heat resistance, abrasion resistance, and surface lubricity of the PTFE are significantly decreased.

The addition of the carbon black not only functions as a black pigment for the surface coating agent of the hybrid resin but also imparts a function of enhancing thermal conductivity, mechanical strength and hardness. In addition, the carbon black affects the dispersibility and surface roughness with the epoxy resin depending on the particle size, morphology, ash, moisture, impurity, specific surface area, agglomeration and the like.

The carbon black may have a spherical shape (specific surface area of 1500 or so) having a larger specific surface area than the needle bed to increase the absorptivity. In this case, the dispersibility and the color formability may be good. On the other hand, when the specific surface area is large, the particle size is small and the dispersibility to organic matters is improved. In addition, the carbon black should exhibit excellent jetting properties after curing and exhibit appropriate viscosity and surface gloss at the time of coating.

When the blending amount of the carbon black exceeds 8 wt%, the adhesive strength with the material decreases, and the surface of the coating after the curing becomes coarse and the surface lubricity decreases. On the other hand, when the blending amount of the carbon black is less than 4% by weight, the film thickness is not formed well, the blackness and the mechanical strength are lowered, and the heat resistance is low.

The graphite serves as an additive to be mixed into the coating liquid and plays a major role in controlling the surface gloss of the coated surface, and is used as an additive to impart heat resistance, black coloring, filler and the like. The graphite has a correlation with the surface gloss, lubricity and dispersibility depending on the manufacturer, constituent components, particle size and the like.

As compared with the carbon black described above, the graphite has good dispersibility with respect to the PTFE, which is a polymer resin, has a low coefficient of friction and an excellent slipperiness, and also has improved lubricity for softening the surface. However, when the graphite is added in a relatively large amount, the surface gloss is lowered.

As in this example, the blend containing 3 to 5% by weight of graphite improved surface gloss and had the highest heat resistance temperature. On the other hand, when the blending amount of the graphite relative to the epoxy resin exceeds 5% by weight, the surface gloss is nearly matte compared to the gloss. The graphite has a lower light transmittance and dark gray color as compared with carbon black. On the other hand, when the blending amount of the graphite is less than 3% by weight, the surface gloss is lowered and the surface lubricity is lowered, and the dynamic friction coefficient is high.

On the other hand, the solvent and diluent of a composition according to one embodiment of the present invention, acetone _{(acetone) (CH 3 COCH 3} ) (CH 3 COC 2 H 5) 9 ~ 13 ~ 17 wt%, MEK (Methy Ethyl Ketone) (Ethylene glycol monobutyl ether) (CH ₃ (CH ₂ ) ₃ CH ₂ O (CH ₂ ) ₂ OH), 13 to 13 wt% of N-butanol (C ₄ H ₉ OH) 3 to 5% by weight, 2 to 5% by weight of 2-ethoxy ethyl acetate (C ₄ H ₈ O ₂ ), 7 to 9% by weight of cyclohexanone (C ₆ H ₁₀ O) % ≪ / RTI >

The types and mixing ratios of the solvent and diluent affect not only the dispersion of the resin but also the surface roughness after curing the product coating. If the content of the solvent and the diluent having too low boiling point is increased, It causes. In addition, since the above-mentioned solvent and diluent are closely related to the dissolution and dispersion of the solid lubricant additive, it is important to select a suitable solvent and diluent and to select their mixing ratio.

As a result of the comprehensive test of the compatibility with the above-mentioned added solid lubricant (PTFE, carbon black, graphite, etc.), the evaporation rate due to drying and curing, the surface gloss of the coated surface after curing and the surface wettability with the material during spray coating, And the mixed solvent group of the above combination showed excellent quality performance.

Meanwhile, the surfactant and the dispersant of the composition according to an embodiment of the present invention may contain 1 to 2 wt% of polyethylene glycol (PEG) (C ₂ nH ₄ N + 2On + 1), polyurethane acrylic type 2 to 4% by weight of 1-methoxy-2-propanol acetate (CH ₃ O-CH ₂ -CH (CH ₃ ) -O-COCH ₃ ) 0.5 to 1 wt% of a wetting agent, 0.1 to 0.3 wt% of a deforming agent, and 0.1 to 0.3 wt% of a settling agent.

In particular, the wetting agent may be a fluorine denaturalization, the antifoaming agent may be of a non-silicon type, and the antidetachment agent may be of a polyamide type.

The surfactants and dispersants are used as additives for facilitating the dispersion of solid lubricants (PTFE, carbon black, graphite and the like) added to the above-mentioned epoxy resin. First, the surfactant has good dispersibility with respect to the solid additive, and aims to prevent the re-aggregation of fine particles close to the primary particles and to prevent precipitation. Since the dispersibility is highly correlated with the visual effect and hiding power of the coating, uniform dispersion of the pigment should be maintained during storage and coating as well as during coating.

The above-mentioned PEG has excellent affinity with additives, has excellent compatibility with most organic solvents, and has good solubility in water, and thus can be used as an organic solvent. Further, since it has a high boiling point, it can be applied as a nonvolatile solvent. Further, in the case of the PEG, it is easy to control the degree of polymerization of ethylene oxide (ethylene oxide), and it is possible to perform various dispersion efficiency tests on the coating agent. In addition, the PEG surfactant has excellent hygroscopicity, and hygroscopicity can be controlled by adjusting the polymerization degree.

Methoxy-2-propanolacetic acid is suitable as a wetting and dispersing agent for oil-soluble paints as a copolymer resin having adsorption with pigments and affinity groups ("Pigment affinic" adhesive groups), and a fine carbon black pigment Is excellent in the dispersion stabilizing function of the dispersant and has an excellent effect in lowering the viscosity of the dispersion.

The wetting agent is a fluorine denatured resin, which serves to accelerate wetting by reducing the interfacial tension of the solid additive and increasing the diffusing force. That is, the wetting agent improves the wetting force of aggregates of fillers. That is, the wetting agent has a surfactant structure, that is, a hydrophilic group polarized in one molecule and a hydrophobic group nonpolar at the same time. Therefore, the wetting agent moves to the interface between the pigment surface and the resin solution, and adsorbs on the surface of the filler to keep the gap between the solid particles constant due to the electrostatic repulsion or the steric hindrance effect, Function.

Fluorine-modified resin can be used as the wetting agent according to this embodiment because it has good wetting efficiency with respect to carbon black, graphite and the like of the solvent-type paint, and has a low boiling point, low cost, and high solubility. The addition of a small amount (0.5 to 2.0%) has an advantage that the wetting power can be increased. However, since the wetting agent alone can not act as a dispersing agent chemically structurally when used alone, the wetting agent should be used in combination with the above-mentioned dispersing agent, that is, the PEG and the 1-methoxy-2-propanolacetic acid.

The antifoaming agent is intended to improve the surface roughness and the surface roughness after drying or curing by pushing the bubbles which can be generated at the time of coating or during painting. The bubbles adsorbing the defoaming agent promote the bundling of bubbles, and at the same time, the difference in density with the polymer resin and the low surface tension of the defoaming agent floats on the surface of the coating. On the other hand, in the case of painting, the bubbles rise upward due to the floating property of the defoaming agent dispersed with the bubbles by evaporation of the solvent and convection

The bubbles floating on the surface of the paint and the coating film are partially pulled by a substance having a large surface tension due to the decrease in the surface tension due to the defoaming agent adsorbed in the coating film and the coating film is stretched and broken.

In the case of this embodiment, a non-silicon type defoaming agent is used, and the non-silicon type defoaming agent has a very low surface tension and thus has a high effect of removing bubbles. In addition, there is an advantage that the puffing force can be increased by adding a small amount. However, if the content of the antifoaming agent is more than 0.3 wt%, the possibility of occurrence of a crater and haze phenomenon may increase.

The anti-settling agent has a function of preventing the flow of the paint and preventing the settling of the solid additives by adding to the paint, thereby improving the stability with time of dispersion of the paint, and also used for smooth painting workability.

The solid lubricants added in the above-mentioned paints are physically settled due to the difference in specific gravity over time. In order to prevent this, a polyamide system is used as the settling agent because it can prevent sedimentation without increasing the viscosity of the solvent type paint. The polyamide system contains a small amount of silicon component and is effective for improving the coagulation phenomenon, and addition of a small amount of the polyamide system can improve stability over time with sedimentation of the coating.

In order to confirm the performance and effect of the high hardness hybrid resin surface coating composition based on the epoxy binder according to an embodiment of the present invention having the above-described structure, The test analysis of the surface coated brake pad linear of the vehicle was commissioned to the Korea Chemical Fusion Test Institute (KTR).

The composition according to one embodiment of the present invention, which is requested to perform a test analysis, comprises 10 to 14% by weight of diglycidyl ether of bisphenol A, 3 to 7% by weight of melamine formaldehyde, a phenolic hardener, 1 to 2 wt% of DICY (Dicyandiamide), 1 to 2 wt% of 2-methyl imidazole, 1 to 2 wt% of dimethylaminomethylphenol, acetone, 13 to 17 weight% of MEK, 9 to 13 weight% of Methyl (Ethyl Ketone), 9 to 13 weight% of N-Butanol, 3 to 5 weight% of Ethylene Glycol Monobuthyl Ether (EGM) 5 to 7% by weight of 2-ethoxy ethyl acetate, 7 to 9% by weight of cyclohexanone, 4 to 8% by weight of polytetrafluoroethylene, 4 to 8% by weight of carbon black, 3 to 5% by weight of graphite, 1 to 2% by weight of polyethylene glycol (PEG), 2 to 4% by weight of 1-methoxy-2-propanol acetate %, Wetting agent 0.5 to 1 0.1 to 0.3% by weight of a defoaming agent, 0.1 to 0.3% by weight of a settling agent, and the phenolic hardener is a phenol novolac (PN), a Novolac type epoxy resin, (Phenol Novolac), the wetting agent comprises a fluorine denaturalization, the antifoaming agent is of a non-silicon type, and the antidetachment agent is of a polyamide type .

Further, the inventors of the present invention compared the performance and the effect of the composition according to an embodiment of the present invention to the brake pad linearity of a vehicle surface-coated with a surface coating agent (hereinafter referred to as a 'comparison target product') of Dow Chemical Co., The results of the analysis are shown in Table 1 below.

<Result of test analysis on Korea Chemical Fusion Test Institute (KTR)> Item Invention Compare Products  1. Surface Hardness (Hv) 342Hv 255Hv  2. Abrasion resistance (mg) 3 mg 18 mg  3. Dynamic friction coefficient 0.13 0.18  4. Adhesion (C-cutting,%) 노 제거 노 제거  5. Tensile Strength (Mpa) 37.8 37.6  6. Flexural modulus (Mpa) 640 604  7. Corrosion resistance (brine resistance, hrs) More than 1,400 More than 1,400  8. Drug / solvent resistance Excellent Excellent

As shown in the table, the surface hardness of the brake pad linear coated with the surface coating composition according to the present invention is 342 Hv, which is much higher than the surface hardness of the comparative product of 255 Hv.

In general, when the surface hardness is at least 250 (Hv, Vickers hardness), the hardness is high. In the case of surface coating with the coating composition according to the present invention, the surface hardness can be greatly improved to be higher than the hardness, Therefore, the surface coating composition according to the present invention can be very effectively used for vehicle parts requiring high surface hardness such as a brake pad liner for a vehicle.

In addition, the brake pad linear coated with the surface coating composition according to the present invention showed a very low wear loss of 3 mg even in the abrasion resistance category, which is judged by the selection of a suitable hardening agent and blending of melamine formaldehyde.

As described above, the present invention relates to a high hardness hybrid resin surface coating composition based on an epoxy binder which can remarkably improve the surface hardness as compared with existing coating parts, and those skilled in the art will appreciate that It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. It is therefore to be understood that the modified embodiments are included in the technical scope of the present invention if they basically include elements of the claims of the present invention.

Claims (1)

A high hardness hybrid resin surface coating composition based on an epoxy binder,
10 to 14% by weight of DGEBA (Diglycidyl ether of bisphenol A), 3 to 7% by weight of melamine formaldehyde, 1 to 2% by weight of a phenolic hardener, 1 to 2% by weight of DICY (Dicyandiamide) 1 to 2% by weight of 2-methyl imidazole, 1 to 2% by weight of dimethylaminomethylphenol, 13 to 17% by weight of acetone, 9 to 13% by weight of MEK (Methy Ethyl Ketone) 9 to 13% by weight of N-butanol, 3 to 5% by weight of ethylene glycol monobutyl ether (EGM), 5 to 7% by weight of 2-ethoxy ethyl acetate, 7 to 9% by weight of cyclohexanone, 4 to 8% by weight of polytetrafluoroethylene, 4 to 8% by weight of carbon black, 3 to 5% by weight of graphite, polyethylene glycol (PEG 2 to 4% by weight of 1-methoxy-2-propanol acetate, 0.5 to 1% by weight of a wetting agent, 1 to 2% by weight of a plasticizer, 0.1 to 0.3% by weight, an anti-settling agent wherein the phenolic hardener is a phenol novolac (PN) (phenol novolac), which is a Novolac type epoxy resin, and the wetting agent is a fluorine denaturalization resin Wherein the antifoaming agent is a non-silicon type antifoaming agent, and the antifouling agent is a polyamide type antifoaming agent.