KR20160056091A - Metal surface protective coating composition - Google Patents

Abstract

The present invention relates to an eco-friendly coating composition for protecting a metal surface to protect the metal surface of various metal products. More particularly, the present invention relates to an eco-friendly and highly transparent coating composition for protecting a metal surface which maintains adhesion or adhesive strength with the metal surface while having improved functionality such as transparency, abrasion resistance, impact resistance, chemical resistance, moisture resistance, flame resistance, corrosion resistance, weather resistance, etc. The coating composition for protecting a metal surface comprises: metal-silicon-based nanocolloid; nanosilica colloid; amine-based silane; epoxy-based silane; and a thermal initiator.

Description

[0001] The present invention relates to a metal surface protective coating composition,

The present invention relates to a high hardness and multifunctional coating composition for metal surface protection.

Almost all materials that are used in various products, electronic devices, electronic components or various industries are exposed to frequent scratching environment, water or heat elements, and are subject to wear, impact, contamination and corrosion due to scratches There is a problem in that a great economic loss occurs due to the chemical change due to the chemical change. Accordingly, studies have been actively conducted on methods for minimizing the above problems by applying or treating a coating composition having functions such as abrasion resistance, impact resistance, chemical resistance, moisture resistance, salt resistance, corrosion resistance and weather resistance to a metal surface to be protected have.

Japanese Laid-Open Patent Publication No. 1995-207190 discloses a method for protecting the surface of a synthetic resin such as a plastic. However, this is a method for protecting the surface of a synthetic resin rather than a metal surface. When the coating composition is applied to the synthetic resin, the problem of the peeling phenomenon between the coating layer and the surface of the synthetic resin can be minimized owing to the excellent adhesive force between the synthetic resins in the curing process, but the peeling phenomenon may occur on the metal surface. In particular, when the surface is applied to a smooth metal surface or when it is applied with a coating layer of a high thickness for protection of a more improved metal surface, better adhesion and adhesion are required. As a result, research on coating compositions with improved adhesion can additionally lead to improved functionality such as improved abrasion resistance, impact resistance and chemical resistance.

Generally, when the above-mentioned functionalities are improved, the adhesion or adhesion between the metal surface and the coating layer tends to decrease. For example, when the content of the component having such characteristics is increased in order to improve the functionality, the adhesion or adhesion between the metal surface and the coating layer is lowered. If the adhesion or adhesion between the metal surface and the coating layer is reduced, the coating layer protecting the surface easily separates from the coating layer, resulting in a failure to exhibit its function. On the contrary, when the content of the component having such a characteristic is increased in order to improve the adhesion or adhesion between the metal surface and the coating layer, the metal surface and the coating layer are firmly adhered to each other to prevent the peeling phenomenon. However, do. Therefore, in order to further improve the functions such as higher hardness, abrasion resistance, and chemical resistance, excellent adhesion properties must be premised. To improve the adhesion of the coating composition for protecting the metal surface, it is considered to be the biggest problem of the research.

Therefore, it is necessary to study a coating composition for protecting a metal surface having the most improved functionality, while keeping the adhesion or adhesion between the metal surface and the coating layer to a minimum as necessary.

Korean Patent Publication No. 10-2010-0116996

An object of the present invention is to provide a coating composition which is excellent in adhesion and adhesion to metal surfaces and can minimize layer separation or peeling even when a coating film layer with a high thickness is formed.

Another object of the present invention is to provide a coating composition for protecting a metal surface which is improved in functionality such as abrasion resistance, impact resistance, chemical resistance, moisture resistance, salt resistance, corrosion resistance and weather resistance while maintaining adhesion or adhesion to a metal surface.

Another object of the present invention is to provide a coating composition for protecting metal surfaces which is harmless to human body and does not affect the unique color of metal surface, which is an environmentally friendly and highly transparent transparent metal surface protective coating composition for protecting metal surfaces of various metal products will be.

The present invention relates to a coating composition for metal surface protection comprising a metal-silicon-based nano-colloid, a nanosilica colloid, an amine-based silane, an epoxy-based silane and a thermal initiator.

The metal-silicon-based nano-colloid may include one or more selected from aluminum, zinc, magnesium, tin, calcium, zirconium and antimony. However, the present invention is not limited thereto, and it is not limited so far as it is a metal that is not harmful to human body, does not significantly affect the environment, and can exhibit the effect of the present invention as a high hardness metal.

In one embodiment of the present invention, the metal-silicon-based nanocolloid may be an aluminum-silicon-based nanocolloid.

In one embodiment of the present invention, the coating composition for protecting a metal surface comprises 30 to 60% by weight of a metal-silicon-based nano-colloid, 30 to 60% by weight of a nano-silica colloid, By weight to 5% by weight of an epoxy silane, 0.1 to 5% by weight of an epoxy silane, and 0.1 to 5% by weight of a thermal initiator. Specifically, the coating composition for protecting a metal surface comprises 35 to 55% by weight of an Al-Si-based nanocolloid, 35 to 55% by weight of a nanosilica colloid, 0.2 to 4% by weight of an amine-based silane, More preferably 0.2 to 4% by weight of the silane and 0.2 to 4% by weight of the thermal initiator. In particular, when the coating composition for protecting a metal surface contains less than 30% by weight of Al-Si nanocolloid based on the total weight of the coating composition for protecting a metal surface, the effect of high hardness or abrasion resistance may be remarkably deteriorated, The adhesion or adhesion with the surface can be remarkably reduced.

In one embodiment of the present invention, the metal-silicon-based nanocolloid may include a metal-silicon-based powder, an organosiloxane polymer, and a solvent.

In one embodiment of the present invention, the metal-silicon-based nano-colloid may include 80 to 185 parts by weight of the metal-silicon-based powder and 50 to 150 parts by weight of the organosiloxane polymer with respect to 100 parts by weight of the solvent.

The particle size of the metal-silicon-based powder may be 2 to 60 nm. If the particle size is less than 1 nm, the hardness of the coating layer may be lowered and the functionality such as abrasion resistance may be deteriorated. When the particle size exceeds 60 nm, the mixing property or dispersibility may be decreased to deteriorate the physical properties. The transparency of the applied layer may be lowered. Therefore, the particle size is preferably 2 to 60 nm, preferably 2 to 50 nm, more preferably 2 to 30 nm.

In one embodiment of the present invention, the organosiloxane polymer is selected from the group consisting of phenyltrimethoxysilane, phenyltriethoxysilane, diphenyltrimethoxysilane, diphenylethoxysilane, methyltriethoxysilane, methyltrimethoxysilane, May be prepared by the polymerization of one or more selected compounds from compounds including tetramethoxysilane, tetraethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, dimethyldimethoxysilane and dimethyldiethoxysilane . However, it is not limited thereto, and the organosiloxane polymer is conventionally known to those skilled in the art, and thus is not limited to a great extent.

In one embodiment of the present invention, the weight average molecular weight of the organosiloxane polymer may be from 300 to 10000, preferably from 400 to 7000, more preferably from 500 to 5000. If the weight average molecular weight is less than 300, the curing time may be increased or the crosslinking reaction may not be sufficiently performed, so that the functionality of the coating composition may be deteriorated. If the weight average molecular weight exceeds 5000, mixing or dispersion may not be easy during stirring.

In one embodiment of the present invention, the nanosilica colloid may comprise 80 to 185 parts by weight of Si powder per 100 parts by weight of solvent.

The particle size of the Si powder may be 2 to 100 nm. In detail, when the particle size of the Si powder is less than 1 nm, the viscosity may increase due to gelation, resulting in deterioration of the mixing or dispersibility and deterioration of the physical properties. When the particle size exceeds 200 nm, the transparency of the coating layer have. Therefore, the particle size of the Si powder is preferably 2 to 100 nm, preferably 3 to 70 nm, more preferably 5 to 50 nm.

In one embodiment of the invention the solvent is selected from the group consisting of methanol, ethanol, 2-propanol, 1-propanol, 1-butanol, , 4-methyl-2-pentanol, cyclohexanol, methylcyclohexanol, n-hexanol, furfuryl alcohol, furfuryl methanol, tetrahydrofurfuryl alcohol and benzyl alcohol; But are not limited to, acetone, methyl ethyl ketone, methyl isobutyl ketone, methyl n-butyl ketone, methyl t-butyl ketone, methyl n-pentyl ketone, methyl n-hexyl ketone, diethyl ketone, diisopropyl ketone, Ketones such as pentanone, cyclohexanone, methylcyclohexanone, cycloheptanone, cyclooctanone, 2,4-pentanedione, 2,5-hexadione and acetophenone; n-pentane, isopentane, n-hexane, isohexane, n-heptane, isoheptane, octane, isooctane, 2,2,4-triethylpentane, cyclohexane, methylcyclohexane, benzene, toluene, Hydrocarbons such as benzene, ethylbenzene, methylethylbenzene, n-propylbenzene, isopropylbenzene, pentylbenzene, diethylbenzene, isobutylbenzene, triethylbenzene and diisopropylbenzene; Diisopropyl ether, di-n-butyl ether, di-isobutyl ether, di-n-hexyl ether, diisopropyl ether, diisopropyl ether, diisopropyl ether, , Phenetol, diphenyl ether, ethyl benzyl ether, bis (2-ethylhexyl) ether, ethylene oxide, 1,2-propylene oxide, 1,4- dioxane, 4-methyl dioxolane, Ethers such as dibenzyl ether and butyl phenyl ether; Methyl acetate, ethyl acetate, n-propyl acetate, isopropyl acetate, n-butyl acetate, isobutyl acetate, sec-butyl acetate, n-pentyl acetate, sec- pentyl acetate, methylpentyl acetate, - ethylhexyl acetate, benzyl acetate, cyclohexyl acetate, methylcyclohexyl acetate, n-nonyl acetate, methyl acetoacetate, ethyl acetoacetate, ethyl propionate, n-butyl propionate, isoamyl propionate, Butyrolactate, n-pentyl lactate, methyl methoxy propionate, ethyl ethoxypropionate, ethyl lactate, ethyl lactate, ethyl lactate, diethyl oxalate, di- , Diethyl malonate, dimethyl phthalate, diethyl phthalate, diethyl carbonate and propylene carbonate And the like; Lactones such as gamma-butyrolactone, gamma-valerolactone and delta-valerolactone; Nitriles such as acetonitrile, propionitrile and acrylonitrile; Diethylene glycol, propylene glycol, 1,2-butanediol, 1,3-butanediol, 1,2-pentanediol, 2,4-pentanediol, Glycols such as 5-hexanediol, 2,4-heptanediol, 2-ethylhexane-1,3-diol, diethylene glycol, dipropylene glycol, triethylene glycol and tripropylene glycol; Hydroxy-3-methyl-2-butanone, 5-hydroxy-2-pentanone, and 4-hydroxy -4-methyl-2-pentanone, and the like; Examples of the glycol ethers include ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monopropyl ether, ethylene glycol mono n-butyl ether, ethylene glycol mono n-pentyl ether, ethylene glycol mono n-hexyl ether, Ethyleneglycol monoethers such as glycol mono 2-ethylbutyl ether, ethylene glycol mono 2-ethylhexyl ether and ethylene glycol monophenyl ether; Ethylene glycol diethers such as ethylene glycol dimethyl ether, ethylene glycol diethyl ether, ethylene glycol methyl ethyl ether and ethylene glycol dibutyl ether; Ethylene glycol monobutyl ether acetate, ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate, ethylene glycol monopropyl ether acetate, ethylene glycol mono n-butyl ether acetate and ethylene glycol diacetate; Propylene glycol monoethers such as propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol mono n-propyl ether, propylene glycol mono n-butyl ether and propylene glycol mono t-butyl ether; Propylene glycol diethers such as propylene glycol dimethyl ether, propylene glycol diethyl ether and propylene glycol methyl ethyl ether; Propylene glycol monobutyl ether acetate, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, propylene glycol mono n-propyl ether acetate, propylene glycol mono n-butyl ether acetate and propylene glycol diacetate; Methyl-3-methoxy-1-butanol, 3-methoxy-1-butanol, 3-methoxybutyl acetate, Diethylene glycol monomethyl ether, diethylene glycol monopropyl ether, diethylene glycol mono-n-butyl ether, and diethylene glycol mono-n-hexyl ether, and the like, such as diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, Glycol monoethers; Diethylene glycol diethyl ether such as diethylene glycol dimethyl ether, diethylene glycol methyl ethyl ether and diethylene glycol diethyl ether; Diethylene glycol monoethyl ether acetate, diethylene glycol monomethyl ether acetate, diethylene glycol monoethyl ether acetate, diethylene glycol monopropyl ether acetate and diethylene glycol mono n-butyl ether acetate; Dipropylene glycol monoethers such as dipropylene glycol monomethyl ether, dipropylene glycol monoethyl ether and dipropylene glycol monopropyl ether; Dipropylene glycol diethers such as dipropylene glycol dimethyl ether; Glycol ether acetates such as ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate, propylene glycol monomethyl ether acetate, diethylene glycol monomethyl ether acetate and diethylene glycol monobutyl ether acetate; Or as a heterogeneous compound, at least one compound selected from the group consisting of N-methylpyrrolidinone, formamide, N-methylformamide, N-ethylformamide, N, N-dimethylformamide, N, Ndiethylformamide, One or more of N, N-dimethylacetamide, N, N-diethylacetamide, N-methylpropionamide, N, N-dimethylsulfoxide, sulfolane and 1,3- . As a typical solvent used in the coating composition, it is more preferable to use ethyl acetate.

In one embodiment of the present invention, the amine-based silane is not limited as long as it is a silane compound having at least one amino group, and both a water-soluble component or an oil-soluble component having a molecular weight of 20 to 2000 can be used. Such as 3-aminopropyltrialkoxysilane. Therefore, the present invention is not limited thereto, and is well known to those skilled in the art, so that detailed description thereof will be omitted.

In an embodiment of the present invention, the epoxy silane is not limited as long as it is a silane compound having at least one epoxy group, but since the epoxy group has a property of binding with the amino group and bridging with the amino group, So that the adhesion or adhesion between the surface and the coating layer can be improved. The epoxy silane is not limited as long as it has a weight average molecular weight of 50 to 5,000, but there are various kinds such as 2- (3,4-epoxycyclohexyl) ethyl trimethylsilane and 3-glycidylpropylmethyldimethoxysilane. The above description is omitted.

In one embodiment of the present invention, the kind of the thermal initiator may be selected from the group consisting of an azo compound, a peroxygen compound, tert-butyl peracetate, peracetic acid or potassium persulfate And a mixture of two or more species. Examples of the peroxocycline compound include, but are not limited to, peroxocycline compounds. The peroxygen compounds include tetramethylbutyl peroxyneodecanoate (eg Perocta ND, NOF), bis (4-butylcyclohexyl) peroxydicarbonate (eg Peroyl TCP, NOF), di Peroyl NPP, NOF), diisopropyl peroxydicarbonate (eg Peroyl IPP, perfluorobutyl peroxydicarbonate, perfluorobutyl peroxydicarbonate, perfluorobutyl peroxydicarbonate) NOF), diethoxyethyl peroxydicarbonate (e.g., Peroyl EEP, NOF), and diethoxyhexyl peroxydicarbonate (e.g. Peroyl OEP, NOF). However, those known to those skilled in the art Therefore, the detailed description will be omitted.

In one embodiment of the present invention, the coating composition for protecting a metal surface is selected from the group consisting of 0.1 to 10 parts by weight of a polyaminoamide compound and 0.1 to 10 parts by weight of a styrene-butadiene block copolymer per 100 parts by weight of a metal-silicon based nano- And may further comprise one or two components. These components have the effect of further improving the impact resistance and the bending resistance together with the adhesion, so that the damage and peeling phenomenon due to the impact due to the high hardness can be minimized.

In one embodiment of the present invention, a method for producing a polyaminoamide compound is such that polyethylene polyamine is placed in a reaction vessel and 100 parts by weight of fatty acid is added to 100 parts by weight of polyethylene polyamine at a temperature of 70 to 100 캜. A method of producing a polyaminoamide compound by heating at a temperature of 260 ° C and removing water in the formed reaction by distillation. The molecular weight of the polyaminoamide compound is not particularly limited, but may be 1,000 to 10,000 weight average molecular weight. The polyethylene polyamine is an amine containing three or more nitrogen atoms in the molecule and may be exemplified by a mixture of diethylenetriamine, triethylenetetramine, tetraethylenepentamine, pentaethylenehexamine, hexaethylheptamine, and polyethyleneamine , Preferably triethylene tetramine, tetraethylene pentamine or pentaethylene hexamine. The fatty acid may contain hydrocarbon radicals having 2 to 22 carbon atoms. Preferably fatty acids having 8 or more carbon atoms, more preferably unsaturated fatty acids having 14 or more carbon atoms, such as oleic acid, tall oil fatty acid, linoleic acid and linolenic acid. Since the method for producing the polyaminoamide compound is well known to those skilled in the art, the detailed description thereof will be omitted and other reactants or other manufacturing methods may be used as the same or similar components. It is not limited.

In one embodiment of the present invention, the styrene-butadiene block copolymer has a high restoring force, excellent impact resistance, and processing stability while retaining functionality such as improved abrasion resistance and high transparency, Can be improved. The method and specific properties of the styrene-butadiene block copolymer are well known to those skilled in the art and are not particularly limited, and examples thereof include Styrolux 3G46, 3G55, 656C, 684D, 693D, BATCHES, S, T and Styroflex 2G66 of STYROLUTION . However, if the styrene-butadiene block copolymer has a styrene-butadiene blend ratio, a molecular weight, or the like, or if other components are added, the styrene-butadiene block copolymer will fall within the scope of the present invention.

In one embodiment of the present invention, a method for producing a coating composition for protecting a metal surface includes the steps of: preparing an Al-Si nanocolloid, nanosilica colloid, amine silane, epoxy silane, thermal initiator, polyaminoamide compound and styrene- And the like may be stirred and dispersed to prepare a coating composition for protecting a metal surface. In detail, the stirring and dispersion can be carried out for 60 to 120 minutes. If the stirring time is less than 60 minutes, the mixing or reaction is not properly performed and the surface protecting effect may be deteriorated. If the stirring time exceeds 120 minutes, It may not be a desirable mode in terms of process efficiency.

In one embodiment of the present invention, a method of applying a coating composition for protecting a metal surface to a metal surface comprises:

S1) applying the metal surface protective coating composition to a metal surface;

S2) primary drying or curing the metal surface after step S1); And

S3) secondary drying or curing the metal surface after step S2);

. ≪ / RTI >

In an embodiment of the present invention, step S1) may be performed by knife coating, reverse roll coating, roll coating, calender coating, curtain coating, Such as extrusion coating, cast coating, dip coating, spray coating, air-knife coating and foaming coating, And applying a coating composition for protecting a metal surface to a metal surface. However, these are well known to those skilled in the art, so further detailed description will be omitted.

In one embodiment of the present invention, the method of applying the coating composition for protecting a metal surface to a metal surface may further include repeating steps S1) to S3) one cycle or two or more cycles.

Also, in one embodiment of the present invention, the drying and curing of step S2) may be performed at a temperature of 20 to 40 ° C, and the drying and curing of step S3) may be performed at 50 to 250 ° C. Drying or curing at different temperatures, primary or secondary, may exhibit ultimate improved physical properties due to differences in the degree of physical or chemical reaction when cured with temperature. For example, when curing rapidly at a high temperature, the hardness can be further improved but the impact resistance can be lowered. Therefore, it is possible to protect metal surfaces even more by providing suitable hardness and impact resistance properties. Also, a method capable of maintaining a constant temperature is preferable for forming a more stable and uniform coating film layer.

In one embodiment of the present invention, the method of applying the coating composition for protecting a metal surface to a metal surface is a matter that can be easily used by those skilled in the art, and thus a detailed description thereof will be omitted.

The metal surface protective coating composition of the present invention is excellent in adhesion and adhesion to metal surfaces and has an advantage in that layer separation or peeling can be minimized even if a coating layer having a high thickness is formed.

The coating composition for protecting a metal surface of the present invention has an advantage that functionalities such as abrasion resistance, impact resistance, chemical resistance, moisture resistance, salt resistance, corrosion resistance and weather resistance can be further improved while maintaining adhesion or adhesive force with a metal surface.

INDUSTRIAL APPLICABILITY The coating composition for protecting a metal surface of the present invention is an environmentally-friendly highly transparent coating composition for protecting a metal surface for protecting metal surfaces of various metal products. The coating composition is harmless to the human body and does not affect the unique color of the metal surface. It can be applied to metals.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The following drawings are provided by way of example so that those skilled in the art can fully understand the spirit of the present invention. Therefore, the present invention is not limited to the following drawings, but may be embodied in other forms, and the drawings presented below may be exaggerated in order to clarify the spirit of the present invention. Hereinafter, the technical and scientific terms used herein will be understood by those skilled in the art without departing from the scope of the present invention. Descriptions of known functions and configurations that may be unnecessarily blurred are omitted.

Hereinafter, examples and experimental results will be described in detail.

(Example 1)

1 kg of phenyltrimethoxysilane having a weight average molecular weight of 8000 and 1 kg of diphenylethoxysilane having a weight average molecular weight of 7000 were put into a reactor and mixed with 0.3 kg of nitric acid at a concentration of 1 normal and 0.7 kg of water One solution was slowly added and reacted. The organic siloxane polymer was then prepared after cooling to room temperature and below 50 < 0 > C.

4 kg of an Al-Si powder having an average particle size of 20 nm, 3 kg of the organosiloxane polymer and 3 kg of ethyl acetate were mixed and stirred at a temperature of 27 ± 2 ° C for 40 minutes at a rotation speed of 40 times / To prepare an Al-Si-based nano-colloid.

4 kg of an Si powder having an average particle size of 20 nm and 3 kg of ethyl acetate were stirred at a temperature of 27 ± 2 ° C for 30 minutes at a rotation speed of 30 times / minute to prepare a nanosilica colloid.

4.5 kg of the Al-Si-based nano-colloid, 4.5 kg of the nano-silica colloid, 0.2 kg of amine-based silane, 3 kg of 3-aminopropyltrialkoxysilane, 0.2 kg of 3-glycidylpropylmethyldimethoxysilane, Diethoxyethyl peroxydicarbonate (e.g., Peroyl EEP, NOF) were mixed to prepare a mixed solution. Subsequently, the mixed solution was stirred and dispersed at a temperature of 27 ± 2 ° C for 1 hour to prepare a coating composition for protecting a metal surface.

The metal surface protective coating composition was applied to a 1 mm thick cast iron surface using a spray coating method. Subsequently, the surface of the cast iron coated with the coating composition was first cured at a temperature of 27 ± 1 ° C. for 3 hours and then cured at 180 ° C. for 20 minutes to prepare a cast iron coated with the coating composition.

(Example 2)

Except that 2.5 kg of Al-Si-based nano-colloid was substituted for 4.5 kg.

(Example 3)

Except that 7 kg of Al-Si-based nano-colloid was used instead of 4.5 kg.

(Example 4)

The procedure of Example 1 was repeated except that 2.5 kg of silica nanocolloid was used instead of 4.5 kg of silica nanocolloid.

(Example 5)

The procedure of Example 1 was repeated except that 7 kg of silica nanocolloid was used instead of 4.5 kg of silica nanocolloid.

(Example 6)

0.5 kg of triethylenetetramine was placed in a reaction vessel, and 0.5 kg of oleic acid was added at a temperature of 70 to 100 캜. After heating to a temperature of 260 캜, water in the formed reaction was removed by distillation to prepare a polyaminoamide compound.

The procedure of Example 1 was repeated except that 0.7 kg of the polyaminoamide compound was further added and mixed.

(Example 7)

Except that 0.2 kg of Styrolux T manufactured by STYROLUTION was further added and mixed.

(Example 8)

The coating composition for protecting a metal surface according to Example 1 was applied to the surface of the cast iron coated with the coating composition according to Example 1 using an injection coating method. The cast iron was first cured at a temperature of 27 ± 1 ° C. for 3 hours and then secondary cured at 180 ° C. for 20 minutes to prepare a cast iron coated with the coating composition twice applied and cured.

(Comparative Example 1)

Except that the Al-Si-based nano-colloid was not mixed.

(Comparative Example 2)

The procedure of Example 1 was repeated except that the nanosilica colloid was not mixed.

≪ Evaluation of physical properties &

1. Hardness

Measured using a manual pencil hardness tester (CT-PC1, manufactured by CORETECH) according to the method and conditions specified in KS D 6711: 2012, and the pencil was measured by applying a force of 7.5 N at an angle of 45 degrees Respectively.

2. Adhesion and Adhesion

Cross-cuts were made 10 times in 2 mm increments horizontally and vertically on specimens with coating layers formed according to the ASTM D3359 Adhesion Test Method and conditions, and then the surface was wiped off and tightly adhered with tape. One side was pulled at a 90 ° angle with a constant force, and the degree of the peeled portion was observed.

3. Abrasion resistance

(MTC-015, MMS) according to the method and conditions set forth in ASTM D 1242. [ The length of 5 cm was measured with a test load of 0.3 kg for 8 hours at a reciprocating speed of 40 times / minute. 5, good 4, moderate 3, degenerative or altered 2, and degenerative or altered 1 were assessed as being equal to those before enucleation.

4. Impact resistance

According to the method and conditions specified in KS D 3520: 2008, the specimens with a radius of 6.33 mm at a height of 50 cm and a load of 0.6 kg were measured 100 times. In the case where the state of the coating layer is the same as that before the execution, 5, good case is 4, normal case is 3, crack is formed in the coating layer or 2 when the defect occurs, and the coating layer is broken or peeled off to exert its function And when it was not possible, it was evaluated as 1.

5. Flexibility

The degree of cracking occurred when the specimen was folded at 90 degrees according to the method and conditions specified in KS M 5000: 2009.

6. Moisture resistance

The specimens were allowed to stand for 7 days in a reactor with a temperature of 40 ± 2 ° C and a relative humidity of 90 ± 3% RH, and then taken out to observe the surface state of the coating layer.

7. Salt resistance (corrosion resistance)

A 5% NaCl aqueous solution was sprayed onto the X-cut specimen at 35 ° C using a salt spray tester (SST-9MS, TERCHY) according to the method and conditions specified in KS D 9520: 2009, Salt spray test).

8. Stain resistance

The contamination was formed by drawing a line 5 cm long in the direction of 45 ° to the coating layer with red and aquatic magic magic, and after 24 hours, contamination source was removed with a remover (ethyl alcohol) to measure the presence or absence of contamination.

9. Chemical resistance

A 20 mm × 20 mm cotton cloth impregnated with ethyl alcohol was reciprocated 10 times with a force of about 5 N to the coating layer, and then the surface state of the coating layer was observed.

An evaluation of the above adhesion, bending resistance, abrasion resistance, impact resistance, moisture resistance, salt resistance, stain resistance and chemical resistance can be achieved by integrating and recalculating each of the measured values to obtain a relative rating of 1, 2, 3, Respectively.

Table 1 shows the hardness, adhesion, bending resistance, abrasion resistance, impact resistance, moisture resistance, salt resistance, and resistance to corrosion of the cast iron coated with the coating composition for metal surface protection according to Examples 1 to 8 and Comparative Examples 1 and 2 Stain resistance and chemical resistance.

In the coating composition for protecting a metal surface of the present invention, the addition of a styrene-butadiene block copolymer has the effect of improving ductility and adhesion such as flex resistance.

In addition, in the coating composition for protecting a metal surface of the present invention, when the application and curing processes are repeated one more time, the resistance to scratch or abrasion is greatly improved, but the adhesiveness is hardly deteriorated.

In addition, in the coating composition for protecting a metal surface of the present invention, most of the functional improvement effect was shown by the addition of the polyaminoamide compound, and the adhesive property was improved even though the hardness was improved.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Those skilled in the art will recognize that many modifications and variations are possible in light of the above teachings.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.

Claims (10)

A metal-silicon-based nanocolloid, a nanosilica colloid, an amine-based silane, an epoxy-based silane, and a thermal initiator. The method according to claim 1,
Wherein the metal-silicon-based nano-colloid comprises one or more selected from aluminum, zinc, magnesium, tin, calcium, zirconium and antimony. 3. The method of claim 2,
Wherein the metal-silicon-based nano-colloid is an aluminum-silicon-based nano-colloid. The method according to claim 1,
Wherein the metal surface protective coating composition comprises 30 to 60% by weight of a metal-silicon based nano-colloid, 30 to 60% by weight of a nano-silica colloid, 0.1 to 5% by weight of an amine based silane, To 5% by weight of a thermal initiator and 0.1 to 5% by weight of a thermal initiator. The method according to claim 1,
Wherein the metal-silicon-based nano-colloid comprises a metal-silicon-based powder, an organosiloxane polymer and a solvent. 6. The method of claim 5,
Wherein the metal-silicon-based nano-colloid comprises 80 to 185 parts by weight of a metal-silicon-based powder and 50 to 150 parts by weight of the organosiloxane polymer with respect to 100 parts by weight of the solvent. 6. The method of claim 5,
Wherein the nanosilica colloid comprises 80 to 185 parts by weight of Si powder per 100 parts by weight of the solvent. The method according to claim 1,
The metal surface protective coating composition is a metal surface-protecting coating composition comprising 0.1 to 10 parts by weight of a polyaminoamide compound and 0.1 to 10 parts by weight of a styrene-butadiene block copolymer per 100 parts by weight of a metal-silicon-based nano- A surface protective coating composition. A method for coating a metal surface with a coating composition for metal surface protection produced according to any one of claims 1 to 8,
S1) applying the metal surface protective coating composition to a metal surface;
S2) primary drying or curing the metal surface after step S1); And
S3) secondary drying or curing the metal surface after step S2);
Wherein the metal surface protective coating composition is applied to a metal surface. 10. The method of claim 9,
And repeating the steps S1) to S3) in one cycle, and repeating the step once or twice or more.