KR100528444B1 - Heat-Resistant Coating Composition - Google Patents

Abstract

The coating composition of the oven is disclosed a heat-resistant coating composition excellent in basic properties such as adhesion, hardness, heat resistance, as well as other properties required for the oven, such as contamination resistance, acid resistance, alkali resistance. The heat-resistant coating composition is 10 to 50% by weight of silicone resin, 2 to 10% by weight of fluorine resin, 5 to 40% by weight of black inorganic heat resistant pigment, 5 to 20% by weight of low melting frit, 5 to 30% by weight of extender pigment, additive 0 It contains -5 weight% and 10-30 weight% of solvents.

Description

Heat-Resistant Coating Composition

The present invention relates to a heat-resistant coating composition, and more particularly, to a composition of the heat-resistant coating for oven applied to the coating to be applied to protect the coating.

Heat-resistant paint is a coating that protects the coating by being coated on the heated object, the research on the heat-resistant coating has been continued for a long time. In order to increase the heat resistance of existing silicone heat-resistant paints to meet various consumer demands due to the development of current technology, a method of improving the heat resistance of the silicone resin itself, a method of using a low melting point frit, an inorganic heat-resistant pigment It has been proposed how to use.

In the case of oven-resistant paints, due to the nature of cooking utensils, in addition to the properties of general heat-resistant paints such as adhesion, hardness and heat-resistance, the paints are required to have excellent stain resistance, acid resistance and alkali resistance. There is a problem that can not be achieved.

Therefore, an object of the present invention for solving the above problems is to provide a heat-resistant coating composition for the oven that can secure additional physical properties such as contamination resistance that can not be secured by the existing heat-resistant paint.

The heat-resistant coating composition of the present invention for achieving the above object is 10 to 50% by weight of silicone resin, 2 to 10% by weight of fluorine resin, 5 to 40% by weight of inorganic heat resistant pigment, 5 to 20% by weight of low melting frit, sieving pigment 5 to 30% by weight, solvent 10 to 30% by weight and additives up to 5% by weight.

The heat-resistant coating composition formed of the above-mentioned material can secure excellent heat resistance and form a coating suitable for coating an oven inside of a cooking utensil, as well as increase the stain resistance and alkali resistance of the heat-resistant coating film formed from the composition. Has

Hereinafter, the heat-resistant coating composition of the present invention will be described in detail.

In order to manufacture the heat-resistant coating material for the oven of the present invention, a silicone-based resin, a fluorine-based resin, an inorganic heat-resistant pigment, a low melting frit, a sieving pigment, a solvent and other additives must be used.

The silicone resin which is a binder among the raw materials used for forming the heat resistant paint is a silicone resin containing a silanol group. The silanol group contained in the silicone resin reacts with other silanol groups or alkoxy groups of the fluorine-based resin participating in the reaction during heat curing to form crosslinks.

It is important to use an appropriate amount because the silicone resin greatly influences the physical properties of the heat-resistant coating film depending on the amount used. If the amount of the silicone-based resin is less than 10% by weight to form the heat-resistant paint, there is a problem that the heat resistance of the heat-resistant coating film is not satisfactory to satisfy the characteristics of the heat-resistant paint, and if the amount exceeds 50% by weight, the heat-resistant coating film is cracked. There is a problem that the appearance is not good.

Therefore, the silicone resin used to form the heat resistant paint is preferably used within the range of 10 to 50% by weight of the total heat resistant paint composition.

Fluorine-based resin is a resin in which fluoroethylene and alkyl vinyl ether are copolymerized, and is applied to improve physical properties that cannot be secured only by the silicone resin such as contamination resistance and alkali resistance. The alkoxyl group included in the fluorine-based resin has a crosslink with the silanol group contained in the silicone resin.

If the amount of the fluorine-based resin for forming the heat-resistant paint is less than 2% by weight, the fouling resistance, alkali resistance, etc. of the coating film formed of the heat-resistant paint is vulnerable, and if the amount is more than 10% by weight, the heat resistance of the paint is deteriorated. do.

Therefore, the fluorine-based resin used to form the heat-resistant paint is preferably used within the range of 2 to 10% by weight of the total coating composition.

Among the raw materials used to form the heat resistant paints, inorganic heat resistant pigments are black inorganic calcined pigments, such as nickel-iron-copper pigments, nickel-iron-copper-cobalt-manganese pigments, copper-chromium pigments, Iron-manganese-copper pigments, copper-chromium-manganese pigments, chromium-iron-manganese-copper pigments, and the like.

If the amount of the inorganic heat-resistant pigment for forming the heat-resistant paint is less than 5% by weight of the total composition occurs the disadvantage that the color becomes thin during the heat resistance test of the coating film, if the amount is more than 40% by weight is difficult to form a coating film Occurs.

Therefore, the inorganic heat-resistant pigment used to form the heat-resistant paint is preferably used within the range of 5 to 40% by weight of the total paint composition.

Among the raw materials used to form the heat resistant paint, the low melting frit is a material that acts as a film forming element above the decomposition temperature of the silicone resin. In other words, when the silicone resin is heated above the decomposition temperature, it is decomposed to silica. In this case, when the silicone resin is used alone without using a low melting point frit, coating layer formation is impossible because there is no coating layer forming element.

Therefore, a low melting frit should be used so that the silicone resin can be melted to form a coating film before being completely decomposed. As the low melting point frit, silicate-based frit, borate-based frit, phosphate-based frit, lead silicate-based frit and the like can be used.

When the amount of the low melting frit is less than 5% by weight, there is a problem in that the heat resistance is lowered due to the inability to sufficiently perform the function as a silicone resin replacement film forming element at a high temperature, and when the amount is more than 20% by weight, the initial coating of the heat-resistant paint There arises a problem that the forming ability is lowered.

Therefore, the low melting point frit is preferably used within the range of 5 to 20% by weight of the total composition.

In addition to the material used in the production of heat-resistant paints, additives such as extender pigments, diluent solvents and dispersants, sedimentation inhibitors, adhesion promoters and the like.

As the extender pigment, talc, mica, chromium oxide, iron oxide, talc, silica, barium sulfate and the like can be used. The extender pigment is preferably used in the range of 5 to 30% by weight.

The diluent solvent is a factor that determines the viscosity of the paint, and includes xylene, toluene, acetone, methanol, butanol, isopropanol, methyl isobutyl ketone, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, and ethylene. Solvents, such as glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate, and ethylene glycol monobutyl ether acetate, can be used.

Here, when the amount of the dilute solvent is less than 10% by weight, the viscosity of the paint is high, and workability is poor, and when the amount is more than 30% by weight, the viscosity of the formed paint is low, so that the working condition due to the flow phenomenon is poor. Occurs.

Therefore, it is preferable to use the dilution solvent within the range of 10 to 30% by weight of the total composition.

The amount of the other additives is used within the range of 5% by weight or less of the total composition for forming the heat-resistant paint. Among the other additives, as a dispersant, a dispersant of various paint additive manufacturers may be used, and as a sedimentation inhibitor, polyethylene wax, polypropylene wax, polyamide wax, etc. may be used, and various silane coupling agents may be used as adhesion promoters. Can be used.

Hereinafter, the present invention will be described in more detail with reference to Examples and Experimental Examples. However, the present invention is not limited by the following examples, and it will be understood that various modifications and applications may be possible within the scope of the present invention based on the detailed description and the claims of the present invention.

Example 1

30 wt% of silicone resin (SILRES REN 60), 8 wt% of fluorine resin (LF-200), 18 wt% of black inorganic heat resistant pigment (4001 BLACK), 10 wt% of low melting frit (FRIT 01-4102P), Oven heat-resistant by mixing and dispersing 15% by weight of the extender pigment (barium sulfate), 3% by weight of the sedimentation inhibitor (MONORAL 3300), 1% by weight of the adhesion promoter (KBM-503, silane), and 15% by weight of the diluent solvent (xylene). A paint was obtained. Table 1 shows the composition of the materials used to obtain the heat resistant paints.

Example 2

Perform the same method as in Example 1, but instead of using 30% by weight of the silicone resin (SILRES REN 60) and 15% by weight of the diluted solvent (xylene), 36% by weight of the silicone resin (DC-805) and the diluted solvent (xylene) 9 wt% was used to obtain a heat resistant paint. Table 1 shows the composition of the materials used to obtain the heat resistant paints.

Comparative Example 1

Perform the same method as in Example 1, but instead of using 30% by weight of the silicone resin (SILRES REN 60) and 8% by weight of the fluorine resin (LF-200), 38% by weight of the silicone resin (SILRES REN 60) is used as a heat-resistant paint. Obtained. Table 1 shows the composition of the materials used to obtain the heat resistant paints.

Comparative Example 2

Perform the same method as in Example 1, but instead of using 18% by weight of black inorganic heat-resistant pigment (4001 BLACK), 10% by weight of low melting frit (FRIT 01-4102P), and 15% by weight of extender pigment (barium sulfate) The heat resistant paint was obtained using 20 weight% of black inorganic heat resistant pigments (4001 BLACK) and 23 weight% of extender pigments (barium sulfate). Table 1 shows the composition of the materials used to obtain the heat resistant paints.

                  Experimental Example ＼ Raw Materials Example 1 Example 2 Comparative Example 1 Comparative Example 2 SILRES REN 60 _{Note 1)} DC-805 _{Note 2)} LF-200 _{Note 3)} 4001 BLACK _{Note 4)} FRIT 01-4102P _{Note 5)} Barium sulfate MONORAL 3300 _{Note 6)} KBM-503 _{Note 7)} Xylene 30081810153115 0368181015319 38001810153115 3008200233115 Sum 100 100 100 100

Note 1) Silicone resin manufactured by Germany WACKER

Note 2) Silicone resin manufactured by Dow Corning, USA

Note 3) Fluorine-based resin manufactured by ASAHI GLASS, Japan

Note 4) Chromium-iron-manganese-copper black inorganic heat resistant pigments manufactured by NEMOTO, Japan

Note 5) Low melting frit manufactured by FERRO, USA

Note 6) Sedimentation inhibitors manufactured by Heungsan Chemical Industries, Korea

Note 7) 3-methacryloxypropyltrimethoxysilane manufactured by Shin-Etsu Chemical, Japan

Experimental Example

The heat-resistant paints obtained in Examples 1 and 2 and Comparative Examples 1 and 2, respectively, were spray-coated onto the SUS specimens and then dried in an oven at 300 ° C. for 20 to form specimens having a coating film having a thickness of 20 to 30 μm. The pencil hardness, adhesion, heat resistance, fouling resistance, acid resistance and alkali resistance of the specimen thus formed were tested. Table 2 shows the test results of the physical properties of the coating film formed of the heat resistant paint.

                Experimental Example ＼ Item Example 1 Example 2 Comparative Example 1 Comparative Example 2 Pencil Hardness _{Note 8)} 2H 2H 2H H Adhesion _{Note 9)} 100/100 100/100 100/100 100/100 Heat resistance _{Note 10)} ○ ○ ○ × Pollution Resistance11 ₎ ○ ○ × × Acid Resistance _{Note 12)} ○ ○ ○ ○ Alkali Resistance _{Note 13)} ○ ○ △ ○

Note 8) For the pencil hardness, Mitsubishi Uni hardness pencil was used.

Note 9) The adhesiveness is cut with a knife to have 100 squares within 1 cm 2, and then adhered with Scotch tape, then peeled off and measured by the number of compartments that remain intact.

Note 10) Heat resistance is measured after 24 hours in an electric furnace at 500 ° C.

Note 11) After staining cooking oil, put it in 350 ℃ oven for 30 minutes, wipe it off with a neutral detergent, and check the coating state and color of the contaminated area.

Note 12) Acid resistance: After dripping 0.1 N sulfuric acid, leave for 2 hours, wipe off and observe the appearance.

Note 13) Alkali resistance is dipped in 0.1 N aqueous sodium hydroxide solution, left for 2 hours, then wiped off and observed.

As shown in Table 2, the heat-resistant coating composition obtained in Examples 1 and 2 showed excellent results in comparison with the coating compositions of Comparative Examples 1 and 2 in the main requirements of heat resistance, fouling resistance, alkali resistance and the like.

As described above, the heat-resistant coating material for an oven is obtained by mixing not only a silicone resin but also a fluorine resin, so that the fouling resistance, acid resistance, alkali resistance of the coating film, etc. can be improved.

In addition, the heat-resistant paint of the present invention contains a proper amount of low melting frit in order to ensure more excellent heat resistance, and therefore has very excellent physical properties suitable for coating the oven inside as a cooking utensil.

Claims (6)

10 to 50% by weight of the silicone resin, 2 to 10% by weight of the fluororesin, 5 to 40% by weight of the inorganic heat resistant pigment, 5 to 20% by weight of the low melting point frit, 5 to 30% by weight of the extender pigment, 10 to 30% by weight of the dilute solvent, and A heat resistant coating composition comprising 5% by weight or less of an additive. The heat-resistant coating composition according to claim 1, wherein the fluorine-based resin is a resin in which fluoroethylene and alkyl vinyl ether are copolymerized. According to claim 1, wherein the inorganic heat-resistant pigment is nickel-iron-copper-based pigment, nickel-iron-copper-cobalt-manganese-based pigment, copper-chromium-based pigment, iron-manganese-copper-based pigment, copper-chromium-manganese Heat-resistant coating composition, characterized in that any one selected from the group consisting of a pigment and a chromium-iron-manganese-copper pigment. The heat-resistant coating composition according to claim 1, wherein the low melting frit is any one selected from the group consisting of silicate frit, borate frit, phosphate frit and lead silicate frit. The heat-resistant coating composition of claim 1, wherein the extender pigment is any one selected from the group consisting of talc, mica, chromium oxide, iron oxide, talc, silica, and barium sulfate. The heat-resistant coating composition according to claim 1, wherein the additive comprises at least one selected from the group consisting of a dispersant, a sedimentation inhibitor and an adhesion promoter.