KR100340670B1 - Materials coated with an antifouling paint - Google Patents

Abstract

The present invention is 50 to 90% by weight of inorganic powder containing alumina (Al ₂ O ₃ ) and phosphorus pentoxide (P ₂ O ₅ ) as essential components and 10 to 50 weight by weight of fluorine resin selected from the group consisting of PTFE, PFA and FEP An inner surface of a grill case coated with an upper surface with at least one coating layer of%, a cooking appliance such as a grill pan, and the like.

Description

Paint coated with antifouling paints {MATERIALS COATED WITH AN ANTIFOULING PAINT}

The present invention relates to a material excellent in antifouling properties and wear resistance of household cooking utensils, heaters and the like.

It is known that the upper surface of a cooking utensil or a member thereof, such as a gas range, a grill case of the gas range, etc., is made of surface-treated steel sheet, stainless steel sheet, and is coated with fluorine resin.

The upper surface of the gas range coated with the fluororesin containing paint of 1-layer paint type or 2-layer paint type is known. Fish oil or meat oil, which stains the top of the gas cooker or the bottom of the grill case during cooking, can be easily wiped off by forming a coating layer formed by coating such a fluorine resin-containing paint, that is, an antifouling paint.

It is also known that the hardness and durability of the coating layer can be improved by adding special fillers for reinforcement in the coating.

However, when the amount of the filler is excessive, there is a problem in that the pollution prevention property is degraded.

Therefore, since the amount of filler is limited, it does not contribute much to improving the hardness and durability of the coating layer. Conventionally, inorganic powder such as alumina is added as a reinforcing material to the coating for the primary coating layer or the intermediate coating layer of the fluororesin paint to improve the coating strength. We are planning. However, these powders have a problem in that the amount of addition is limited, so that the improvement in coating strength and durability is small. When comparing as coating film strength, the degree of 2 rank-up was a limit.

Moreover, the characteristics of the known coating layer are insufficient in terms of washability, hardness and durability when used in pots in which cooked foods often boil and are frequently soiled, and the top surface is white or the like to achieve washability, hardness and durability. It is difficult to make it pale.

BRIEF DESCRIPTION OF THE DRAWINGS Sectional drawing of a part of coating material which is 3rd Embodiment of this invention.

* Explanation of symbols for main parts of the drawings

1: base material (for example, steel plate for the upper surface of a gas range)

2: initial coating layer

3: middle coating layer

4: finish coating layer

The present invention provides 50 to 90% by weight of inorganic powders such as alumina (Al ₂ O ₃ ) and phosphorus pentoxide (P ₂ O ₅ ) as essential components, polytetrafluoroethylene (hereinafter referred to as PTFE), tetra 10-50 weight of at least one fluororesin selected from the group consisting of fluoroethylene-perfluoroalkyl vinyl ether copolymers (hereinafter referred to as PFA) and polytetrafluoroethylene-hexafluoropropylene copolymers (FEP) The present invention relates to materials for household cooking utensils, heaters, and the like, which are made of at least one coating layer (hereinafter referred to as " filler-containing fluororesin coating layer ") containing%, and which are excellent in pollution prevention and wear resistance.

In addition, the present invention provides the anti-pollution properties of a filler-containing fluororesin coating layer as a top coat and a primer coat containing polyether sulfone resin (PES) as an essential component in the required parts. Provide the material with

The present invention furthermore comprises a finish coating layer of at least one fluorine resin selected from the group consisting of PTFE, PFA and FEP, an intermediate coating layer of the filler-containing fluorine resin coating layer described above, and PES as an essential component in the required part. It provides a material with antifouling composition consisting of a primary coating layer.

According to the present invention, materials such as gas ranges with improved hardness and durability can be used for boiling soup pans because they can maintain long-term cleaning properties without deterioration of anti-pollution, and are also colored in bright colors such as white. You may.

The first embodiment of the present invention is composed of 50 to 90% by weight of inorganic powders such as alumina (Al ₂ O ₃ ) and phosphorus pentoxide (P ₂ O ₅ ) as essential components, and PTFE, PFA and FEP as essential components. The present invention relates to a material such as a household cooking utensil, a heater, and the like made of at least one coating layer (filler-containing fluororesin coating layer) containing 10 to 50% by weight of one or more selected fluorine resins.

A second embodiment of the present invention relates to a material having antifouling properties comprising a primary coating layer containing PES as an essential component in a required portion and a fluorine resin coating layer containing a filler as a finish coating layer.

The third embodiment of the present invention is a finishing coating layer of at least one fluorine resin selected from the group consisting of PTFE, PFA, and FEP, an intermediate coating layer of the filler-containing fluororesin coating layer, and required parts. It relates to an antifouling material composed of a primary coating layer of PES as an essential ingredient.

Materials of the present invention include gas cookers, electric stoves, gas ovens, microwave ovens, inner surfaces of grill cases, grill pans, household cookware such as stove tops, heaters, and the like.

The base material of the coating material may be made of surface-treated steel such as phosphate-treated steel, zinc phosphate-treated steel, stainless steel, hot-dip aluminum-plated steel, hot-dip aluminum-zinc plated steel (zinc-plated steel), or the like.

According to the first embodiment of the present invention, a filler-containing fluororesin coating layer is coated on a required portion of the material. That is, you may coat directly on a base material surface, and you may coat as a finishing coating layer (2nd embodiment) or an intermediate coating layer (3rd embodiment).

Filler-containing fluorine resin coating layer is 50 to 90% by weight, preferably 60 to 70% by weight of inorganic powder containing alumina and phosphorus pentoxide as essential components on the basis of paint solids, and 10 to 50% by weight of fluorine resin, preferably It is formed by coating the coating material for the filler-containing fluororesin coating layer containing 15 to 30% by weight on the primary coating layer or the base material.

If the amount of the fluorine resin is less than 10% by weight, sufficient adhesion will not be achieved, whereas if the amount of the fluorine resin is more than 50% by weight, the hardness of the formed coating film is lowered.

The inorganic powder added should contain alumina and phosphorus pentoxide as essential ingredients.

The preferred amount of alumina is about 20 to 50% by weight, more preferably 30 to 45% by weight relative to the total amount of the paint for the filler-containing fluororesin coating layer.

The preferred amount of phosphorus pentoxide is about 20 to 50% by weight, more preferably 25 to 35% by weight relative to the total amount of the paint for the filler-containing fluororesin coating layer.

Inorganic powders other than alumina and phosphorus pentoxide may be added to the coating material for the intermediate coating layer. Examples of such inorganic powders include alkali metal oxides such as sodium oxide and potassium oxide.

The particle size of the inorganic powder is preferably 1 to 20 µm, more preferably 1 to 10 µm.

Examples of the fluororesin added to the filler-containing fluororesin coating material include PTFE, PFA, and FEP, most preferably PTFE and PFA, which may be used alone or in combination.

Other components added to the paint for the filler-containing fluororesin coating layer are pigments such as carbon black and titanium mica. The reason why the hardness of the coating film is remarkably improved by the present invention is not clear, but a composition containing alumina and phosphorus pentoxide is mixed. It is believed that, as phosphorus pentoxide melts by heat, it binds with alumina particles and binds with fluorine resin to fix alumina to contribute to coating strength.

The thickness of the filler-containing fluororesin coating layer is preferably 30 µm to 60 µm, more preferably 40 µm to 50 µm. In order to obtain sufficient hardness, thickness of 30 micrometers or more is preferable. If the thickness of the filler-containing fluororesin coating layer is 60 µm or more, it is difficult to obtain excellent adhesion.

According to the second embodiment of the present invention, the base material is first coated with the coating material for the primary coating layer containing PES as a main component. The amount of PES in the coating material for the primary coating layer is 40 to 85% by weight, preferably 45 to 60% by weight based on the solids content of the primary coating layer paint. Other components optionally added to the coating material for the primary coating layer include fluorine resins such as other resins such as PTFE and pigments such as carbon black and titanium oxide.

PES is excellent in the adhesiveness with respect to the said steel base material and an intermediate coating layer, and is excellent in workability as resin for a primary coating layer.

Preferable thickness of the rough coat layer is 5 micrometers-10 micrometers, More preferably, they are 7 micrometers-9 micrometers.

The primary coating layer is used to obtain good adhesion between the base steel and the intermediate coating layer.

A third embodiment of the present invention is illustrated in FIG. 1, in which the base material 1 is coated with the above-described paint for the primary coating layer 2, and then the filler-containing fluororesin as the intermediate coating layer 3 After coating the coating material for the coating layer, the coating material for the finishing coating layer 4 is coated thereon.

The mixing | blending of the coating for primary coating layers and the coating material for intermediate coating layers, and the preferable thickness of a coating layer are based on what was mentioned above. If the intermediate coating layer made of the filler-containing fluororesin coating layer is omitted, excellent adhesion and hardness cannot be obtained.

The paint for the finish coating layer 4 contains at least one fluorine resin selected from the group consisting of PTFE, PFA and FEP. PTFE and PFA are the most preferable, and these may be used alone or in combination in view of contamination prevention.

The paint for the finish coating layer may contain other components such as pigments such as carbon black and titanium mica.

The amount of the fluorine resin in the paint for the finish paint layer is preferably 80% by weight or more, more preferably 90% by weight or more based on the total solids of the paint for the finish paint layer. If the amount of the fluorine resin is less than 80% by weight, the antifouling property is poor.

The coating material for the finishing coating layer is prepared in powder form or suspension form, and is coated by spraying, powder coating, electrodeposition coating or the like.

1 micrometer-10 micrometers are preferable, and, as for the thickness of a finishing coating layer, 1 micrometer-5 micrometers are more preferable. When the thickness of the finish coating layer is 10 µm or more, the coating film surface tends to bend.

The finishing coating layer is effective in providing more excellent antifouling property to the surface of materials such as cooking utensils.

The coating material for the primary coating layer may be a liquid or a dispersion coating composition.

It is preferable that the paint for filler containing fluororesin coating layers is a dispersion coating composition.

It is preferable that the coating material for finishing coat layers is a dispersion or powdery coating composition.

These coating compositions are coated by methods such as spraying and electrodeposition coating. The fluorine resin contained in the coating composition is typically melted by heating over a substrate at about 400 ° C. for 20 minutes, or at 420 ° C. for 10 minutes.

The invention is illustrated by the following examples, which are not intended to limit the scope of the invention.

Example (Manufacture of Paint Plate of Third Embodiment)

First coat layer formation

The paint for the primary coating layer was prepared according to the U1 formulation shown in Table 1.

Polyether sulfone resins, PTFE powders and pigments (comprising carbon black and titanium oxide) were ground uniformly in sand grind mills and bowl mills.

The obtained coating material was sprayed onto the surface of the stainless steel sheet previously degreased with an alkaline degreasing agent and coated.

Intermediate paint layer formation

The paint for the intermediate coating layer was prepared according to the M1 to M9 formulations shown in Table 2.

Note: Ratio is expressed in weight percent.

PTFE and PFA were used in powder form.

Pigment A: Al ₂ O ₃ 40 (wt%)

P ₂ O ₅ 30 (% by weight)

Na ₂ O 15 (% by weight)

K ₂ O 15 (% by weight)

Pigment B: TiO ₂ 100 (% by weight)

Each blend was ground uniformly in a sand grind mill and bowl mill to produce corresponding paints respectively.

The obtained paints were respectively coated on the primary coating layer by the spray coating method.

Finishing paint layer formation

Paints for the finish coating layer were prepared according to the T1 and T2 formulations shown in Table 3.

Note: The ratio is expressed as weight percent solids.

PTFE, PFA, carbon black, and titanium mica were uniformly ground in a dissolver to prepare a dispersion paint.

The obtained dispersion coating material for the finished coating layer was coated on the intermediate coating layer by the spray coating method, respectively.

Each substrate coated with three coating layers was heat-baked at 420 ° C. for 10 minutes.

Evaluation

(1) Twelve steel sheet specimens having three coating layers or two coating layers were prepared by forming the primary coating layer, the intermediate coating layer, and the finishing coating layer. The thicknesses of the primary coating layer, the intermediate coating layer, and the finished coating layer were about 7.5 μm, about 40 μm, and about 5 μm, respectively.

The combination of each paint and the results of adhesion, hardness and antifouling obtained by the combination are shown in Table 4.

(2) The thickness of these coating layers was changed using the paint for the primary coating layer (U1), the paint for the intermediate coating layer (M3), and the paint for the finishing coating layer (T1), thereby changing the thickness of these nine specimens (Nos. 13 to No. 21) were prepared and investigated by evaluating the effect of these thicknesses on adhesion, hardness and antifouling properties. The results are shown in Table 5.

⊙ The thickness of each coating layer is μm.

Adhesive

After three hours of heat treatment (baking), the three coating layers on the substrate are cut into inspection patterns (2 mm x 2 mm), and are 5 to 5 in a room where there is no direct sunlight and no gas, moisture, dust, etc. that affect the test results. It was kept at 35 ° C.

The results were evaluated according to the following criteria.

○: no peeling at all

△: slight peeling is observed

×: peeling of the coating film is observed

Hardness 1

Hardness was evaluated according to the pencil hardness test according to JIS K5400.

The results were evaluated according to the following criteria.

○: 9H or more

△: 4 to 8H

×: 3H or less

Hardness 2

The coating surface was scratched once at a 45 degree angle with a pressure of 1 kg / cm ² with a coin.

The results were evaluated according to the following criteria.

(Circle): There was no peeling of the coating film which reaches to a base material.

△: peeling of the coating film reaching the substrate is less than 30%

X: Peeling of the coating film which reaches to a base material is 30% or more

Pollution prevention

Fish oil was dropped on the surface of the coating film and heated at 300 ° C. for 1 hour. The adhered stains were removed by wiping with a tissue. This treatment was repeated 10 times and evaluated.

(Circle): The adhered stain is not observed at all.

△: the adhered stain is partially removed

X: The adhered stain is hardly removed

By setting it as the structure of the present invention, the coating material excellent in washability, abrasion resistance, and a pollution prevention property can be provided.

Claims (22)

On the substrate, 50 to 90% by weight of inorganic powder containing alumina (A1 ₂ 0 ₃ ) and phosphorus pentoxide (P ₂ 0 ₅ ) as essential components, polytetrafluoroethylene, tetrafluoroethylene-perfluoroalkyl vinyl A material having an antifouling property comprising at least one coating layer containing 10 to 50% by weight of at least one fluororesin selected from the group consisting of ether copolymers and tetrafluoroethylene-hexafluoropropylene copolymers. The material with antifouling properties according to claim 1, wherein the coating layer is a finish coating layer. The antifouling material according to claim 1, wherein the coating layer is an intermediate coating layer. The antifouling material according to any one of claims 1 to 3, wherein the fluoro resin is a polytetrafluoroethylene, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer or a mixture thereof. 50 to 90% by weight of an inorganic powder containing alumina (A1 ₂ 0 ₃ ) phosphorus pentoxide (P ₂ 0 ₅ ) as an essential component, a polytetrafluoroethylene, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer, and A primary coating containing 10 to 50% by weight of at least one fluororesin selected from the group consisting of tetrafluoroethylene-hexafluoropropylene copolymers and a polyether sulfone resin (PES) as an essential component Layered antifouling material. 6. The material of claim 5, wherein the fluororesin of the finishing coating layer is polytetrafluoroethylene, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer or mixtures thereof. The material of Claim 5 whose thickness of a primary coating layer is 5 micrometers-10 micrometers, and the thickness of a finishing coating layer is 30 micrometers-60 micrometers. Finish coating containing at least one fluororesin selected from the group consisting of polytetrafluoroethylene, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer and tetrafluoroethylene-hexafluoropropylene copolymer as essential components 50 to 90% by weight of the inorganic powder containing alumina (A1 ₂ 0 ₃ ) and phosphorus pentoxide (P ₂ 0 ₅ ) as essential components, polytetrafluoroethylene, tetrafluoroethylene-perfluoroalkyl vinyl An intermediate coating layer containing 10 to 50% by weight of at least one fluorine resin selected from the group consisting of ether copolymers and tetrafluoroethylene-hexafluoropropylene copolymers, and polyether sulfone resins (PES) as essential components A material with antifouling properties consisting of priming paint layers. The material according to claim 8, wherein the fluororesin of the finishing coating layer is polytetrafluoroethylene, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer or mixtures thereof. The material according to claim 8, which is a polytetrafluoroethylene, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer or a mixture thereof of the fluororesin of the intermediate paint layer. The material according to claim 8, wherein the amount of fluorine resin in the finish coating layer is at least 80% by weight based on the total solids of the finish coating layer. The material according to claim 8, wherein the thickness of the primary coating layer is 5 µm to 10 µm, the thickness of the intermediate coating layer is 30 µm to 60 µm, and the thickness of the finish coating layer is 1 µm to 10 µm. The material according to any one of claims 1 to 3, which is a heater, a home cooker or a part of a cookware. The material of claim 4 which is a heater, a domestic cooker or a part of a cookware. The material of claim 13, wherein the household cookware is selected from the group consisting of a gas range, an electric range, a gas oven, and a microwave oven. 15. The material of claim 14, wherein the household cookware is selected from the group consisting of gas cookers, electric cookers, gas ovens, and microwave ovens. The material of claim 13, wherein the parts of the household cookware are selected from the group consisting of an inner surface of the grill case, a grill pan, and an upper surface of the range. 15. The material of claim 14, wherein the parts of the household cookware are selected from the group consisting of an inner surface of the grill case, a grill pan, and an upper surface of the range. 18. The material of claim 17, wherein the top of the range is pale colour. 19. The material of claim 18, wherein the top of the range is pale colour. The material according to any one of claims 5 to 7, which is a heater, a home cooker or a part of a cookware. The material according to any one of claims 8 to 12, which is a heater, a home cooker or a part of a cookware.