KR19980075926A - Manufacturing method of ceramic coating liquid coated on metal plate at low temperature - Google Patents

Abstract

The present invention requires a separate facility for heating at a high temperature because the ceramic coating on the metal plate at a high temperature of about 800 ℃ is used for interior and exterior building materials is coated with a high temperature, and the metal material due to high temperature heating In the manufacturing method of the ceramic coating liquid which can be coated on the metal plate even at low temperatures in the range of about 180 ° C to 220 ° C, as well as changes in properties and problems of easy corrosion and torsion when heated to high temperatures. It is about.

Description

Manufacturing method of ceramic coating liquid coated on metal plate at low temperature

The present invention relates to a method for producing a ceramic coating liquid that can be coated on the surface of the metal plate used as interior and exterior building materials at low temperatures, and to a method for producing a ceramic coating liquid that can be coated on an aluminum plate as well as a metal plate. .

Currently, in order to coat ceramics on metal plates, the ceramics are coated on iron plates at a high temperature of about 800 ° C. Therefore, a separate heating facility is required to heat them to high temperatures. Due to the problem that the corrosion is easily generated due to the reduction and the problem that the warpage occurs, the defect of the product is generated.

In addition, in order to coat at a high temperature, a lighter weight aluminum plate was more impossible to coat.

In order to coat the ceramic on a metal plate and use it for construction, the ceramic powder was coated using only an iron plate which is not fired even at a high temperature because the powdery ceramic is dissolved at a high temperature.

Therefore, when the ceramic is coated by heating at high temperature, it heats up to 800 ℃ close to the transformation point of iron, so the physical properties of other materials change, and after coating, problems such as twisting, bending and ductility of the coated iron plate are exposed. Because the plastic is made in the strength is strong, there is a problem that the crack is weak even in a weak impact.

Therefore, the development of a ceramic coating solution that can be coated even at low temperatures was required.

Therefore, the present invention is 0.5-1μ to provide a coating liquid that can be coated even at low temperatures so as to coat the ceramic on aluminum (specific gravity 2.7), which is not only metal but also rust and specific gravity corresponds to 1/3 of iron (specific gravity 7.8). Powder of ceramics is 0.5-1μ pigment for coloring and vehicle (binder) to improve adhesion and the alcohol used as a solvent to make them have a suitable viscosity as a composition than aluminum recrystallization temperature By coating at low temperature, it is possible to coat not only iron plate but also aluminum plate.

Therefore, the present invention uses a ceramic that emits far-infrared rays, which is beneficial to the human body while being easily cleaned even after the attachment of foreign matters, and as a filler, a vehicle for inducing adhesion and a pigment for producing color, and a solvent for mixing them. By mixing the appropriate amount, the ceramics are prepared in the liquid phase, and the raw material combination properties of the ceramic liquids are composed of plastic materials within the range of 180 ° C to 220 ° C, while maintaining the properties of complex functions such as mechanical, thermal, chemical, and biological. It can be used by forming a coating film on the coating material with other materials.

1 is a process diagram showing the process of the present invention

Hereinafter will be described in detail based on one embodiment as follows.

For the composition of ceramic liquid, firstly, 0.5-1μ powder ceramic was used as filler and binder (vehicle) was used to improve adhesion. Alcohol was used as solvent to maintain and dilute viscosity. An inorganic pigment was used as a composition.

Pigment for color was used inorganic pigments obtained at high temperature, 0.5-1μ powder of the same size as the particles of the powder ceramic is best used as the pigment particles of the heat-resistant pigment obtained at 1200-1500 ℃ Should be

This is because inorganic pigments and organic pigments obtained at low temperatures are easily discolored by heat, so there is a problem in use as pigments in ceramics which are baked at 180 ° C-220 ° C.

In addition, as a solvent used in the present invention, I.P.A is used, and when methyl or ethyl alcohol is used, the dilution reaction is bad and the life cycle (time to harden after aging) is too fast.

At this time, water can be used as an alternative to alcohol, but if water contains impurities, it is not easily stirred, and if the thickness of the coating is thick after drying, bubbles may be generated on the surface during drying.

The reason why the pigment is used to color in the present invention is to allow the pigment to be dispersed in a state in which the pigment is not solved in a vehicle or an alcohol used as a solvent. Not.

In addition, the metal alkoxide (alxoxide) which is an organometallic compound was used as the binder. The general formula of the metal alkoxide used as the binder (vehicle) is M (OR) n (M is a metal such as Si, Ti, Al, Sn, and R is Alkyl group of Methyl, Ethyl, Butyl, etc.).

Therefore, the metal alkoxide is thermally decomposed and hydrolyzed to become a metal oxide, and the reaction is as follows.

Pyrolysis

M (OR) n --- MOn / ₂ + n / 2R (OH) + Olefin

Hydrolysis reaction

M (OR) n + NH ₂ O --- M (OH) n + nR (OH)

M (OH) n --- MOn / ₂ + n / 2H ₂ O

As described above, M (OR) n is hydrolyzed and condensation-polymerized as a gel is formed to produce a partial condensate and harden to form a high molecular weight stable coating.

The following equation is an example of hydrolysis and polycondensation reaction.

** Ti (OC ₂ H ₅ ) ₄ + 4H ₂ O ------- Ti (OH) ₄ + 4C ₂ H ₅ (OH)

Ti (OH) ₄ --------- TiO ₂ + 2H ₂ O

** Si (OC ₂ H ₅ ) ₄ + Zr (OC ₄ H ₉ ) ₄ + 8H ₂ O ------- SiZr (OH) ₈ + 4C ₂ H ₅ OH + 4C ₄ H ₉ OH

SiZr (OH) ₈ ------- SiZrO ₄ + 4H ₂ O

In addition, in the present invention, although the metal alkoxide is used as the binder, another binder may be silicate, zirconium salts, and phosphate organometallic compounds. By using Zn, MgO, etc., water resistance, corrosion resistance, hardness, etc. can be improved.

In addition, as the filler used in the present invention, SiO ₂ used for corrosion resistance is used, but Al ₂ O ₃ , ZrO ₂ , SiC, Si ₃ N ₄ , and the like may be used.

In addition, the alcohol used as a solvent was I.P.A. (Isopropanol alcohal) having a lower specific gravity, higher boiling point, higher freezing point and higher flash point than ethanol or methanol.

In addition, as a blending method for mixing these compositions, even when randomly mixed, it can be seen that they are not dispersed even after a long time of stirring, but the powder filler and pigment are first blended with alcohol to sufficiently disperse them. If it is combined with the gel vehicle as a binder in the state, and not in this order, the aggregated state of the filler and the pigment is not solved, so that it cannot be used.

This phenomenon is because the ceramics and pigments are 0.5-1μ fine powder, so the ceramics and pigments stored in the distribution process are granulated to a certain size by moisture or static electricity. It is impossible to disperse, and it is not lumped together.

In addition, when the solvent is made of water, the specific gravity is higher than that of alcohol, so a considerable force is required during stirring, and the stirrer needs to be enlarged every stirring time.

In addition, even in this case, when the coating on the aluminum plate as well as the metal plate, the desired coating thickness of 20-30μ could not be obtained at one time. Pinol) was generated, and the drying time was long and the drying was not easy.

Therefore, as a solution of this, the coating thickness of one coating was less than 10μ and then dried at 100 ° C. or less and repeated 2-3 times, and the desired coating could be achieved by drying at 180-200 ° C. during the final third coating. .

This phenomenon occurs when the coating film of about 30μ is formed at one time and dried at a high temperature, so that the surface of the coated coating is dried first and then cured, and the portion formed in the lower layer evaporates later. I could see that the play occurs without exiting.

Therefore, it was found that the formulation of the solvent as alcohol was considerably superior in terms of economics and product quality.

In the case of alcohol, 20-30% is blown off during the spray coating process before drying, and all the alcohol components are blown off as the temperature is increased at the time of rolling, so that the complete drying is possible.

In addition, the use of the pigment usually takes 1-12% of the total ratio, and when these pigments are mixed in the solvent, it can be seen that it also plays a role as a filler because it is a powder like a filler, but this is a problem in the mixing ratio. In terms of cotton, the ratio of the pigments is not so important, but only for the color.

Also, even when the solvent is mixed with alcohol, it can be seen that the coating state changes considerably according to the amount of the filler and the amount of the binder as the amount of the filler is large or small, and the mixing ratio of each composition is also very important. Could.

Hereinafter, the present invention will be described in detail with reference to the following.

Example 1

Filler (ceramic powder) 25-28%

Binder (vehicle) 30-40%

Solvent (alcohol) 30-40%

Pigment 5-12%

The above mixing ratio shows the percentage when the total amount is 100%. The mixing ratio is not based on 100%, but is sufficiently dispersed by mixing alcohol with the pigment and filler, which are primarily powders. It is most suitable to keep the ratio of the powder pigment and the filler mixed with alcohol at 1: 1 because it is to be blended into the binder in the gel state afterwards, and for the white coating, the filler is white because the raw material of the filler is white. It takes as much as the pigment enters.

As such, the filler, pigment, and solvent should be mixed and dispersed by using a ball mill, and the ball mill should be used as a stirring method. The stirring time may vary depending on the function of the ball mill. When the ball mill is used, it is not necessary to run out of time since the agitated product is automatically released according to the desired stirring state.

In the case of blending and dispersing the above-mentioned mixture with the binder, it was found that when the binder was 4, the filler and the pigment blended with the solvent were best at a ratio of 6.

In addition, in this method of stirring, since the binder is in a gel state, it is not necessary to stir using a ball mill and sufficient stirring is required using a stirrer. However, in the present invention, after stirring vigorously at 5000 RPM for 1 hour, 500- Stir at 1000 RPM for 4 hours.

As a result of coating the ceramic liquid thus prepared on an aluminum plate or a metal plate, it was found that the adhesion strength and the hardness were excellent.

It was found that the longer the stirring, the better the usability, the better the adhesive strength, and the better the workability. However, when the stirring was stopped after the use, it was hardened after 5 hours. If you can use it, but it was found that the gloss is poor.

In addition, as the curing started, it was found that after 48 hours, the stirring was not easily performed, and it was possible to reuse with sufficient stirring, but the adhesion and the gloss were remarkably decreased.

Example 2

Filler (ceramic powder) less than 15%

Binder (vehicle) 30-40%

Solvent (alcohol) 30-40%

Pigment 5-12%

When the filler was less than 15%, since the proportion of the solvent was increased, it was difficult to form the thickness of the coating film because no structure was formed during coating.

This is because the viscosity is increased due to the excessive solvent, the flow is severe after coating so that the thickness of the coating film is not formed.

Example 3

Filler (ceramic powder) 30% (or more)

Binder (vehicle) 30-40%

Solvent (alcohol) 30-40%

Pigment 5-12%

In addition, when the filler was 30% or more (that is, when the mixture of the filler and the pigment was mixed with the solvent and the ratio of the binder was 4.5: 6), there was no problem with the coating film, but there was a difficult problem when spraying the coating film. It became clear that when the thickness of became 40 micrometers or more, a crack generate | occur | produced at the time of drying.

Example 4

Filler (ceramic powder) 25-28%

Binder (vehicle) 45% (or more)

Solvent (alcohol) 30-40%

Pigment 5-12%

In addition, when the binder was 45% or more in the total percentage (that is, when the binder ratio was 6: 4.5 or more), it was found that the state of the coating film was not stable because the solvent ratio was increased as in Example 2.

Example 5

Filler (ceramic powder) 25-28%

Binder (vehicle) 25% (less than)

Solvent (alcohol) 30-40%

Pigment 5-12%

In addition, when the binder was less than 25% of the total percentage, the bonding role was not smooth and cracks occurred immediately after drying.

Example 6

Filler (ceramic powder) 25-28%

Binder (vehicle) 30-40%

Solvent (alcohol) 40% (or more)

Pigment 5-12%

When the alcohol, which is a solvent, is mixed with the filler in powder form of 40% or more, it was found that the agitation was easy because the mixture was too thin. However, the agitation with the binder resulted in a low viscosity so that a flow was generated during coating and no coating film was formed. Could know.

Example 7

Filler (ceramic powder) 25-28%

Binder (vehicle) 30-40%

Solvent (alcohol) 30-40%

Pigment 15% (or more)

When the pigment is used in more than 15%, considering that the mixing ratio of the solvent, the filler and the pigment is 1: 1, it can be seen that the same phenomenon occurs as in Example 2 because the amount of the filler is reduced.

Therefore, it was found that the ratio of the pigment and ceramic first mixed with the solvent, which is the solvent, is 1: 1, and the ratio of combining the compound with the binder is 6: 4.

In addition, the order of blending is to mix the ceramic powder and pigment with alcohol, stir it sufficiently, and disperse it in a ball mill.

This is because the ceramics and pigments, which are powders, are made into particles by moisture or static electricity, so that they cannot be dispersed by agitation and must be sufficiently dispersed by a ball mill.

In this way, the ball mill for dispersing should be stirred for at least 3 hours at least 1000rpm or less, and in the case of stirring the stirred solution with a binder for 5 hours at 500-1000rpm or less after vigorously stirring for 1 hour at 5000RPM. It was found that the stirring was easily completed by the stirring.

The immediate use of the agitated ceramic solution was found to be excellent in glossiness and plastering, and when stirred for 5 hours or less, it was found that after 6 hours of aging, the coating film was formed.

At this time, the viscosity is about 10 seconds to 14 seconds to filter it to about 250-400 mesh to obtain a more excellent plastering.

In addition, it was found that the room temperature was maintained at 30 ° C. during stirring and that the stirred ceramic liquid was effective for 15 days at 3-6 ° C.

In addition, it was found that the result of experimenting at the subzero can be longer than the conventional one, but instead, the physical properties were solidified, so it was not easy to use.

The agitated ceramic coating solution was coated on one surface of an aluminum plate or a metal plate to be coated using a sprayer, and the following results were obtained.

First of all, it is best to hit 100-120 mesh particles even when hitting the part to be coated with sand (for aluminum plate) or iron ball (for metal plate) to form a groove of a certain depth for accurate coating. It can be seen that the adhesion strength is excellent, and when it is more than that, the adhesion strength is weak and only about 95% was obtained in the crosscut test method.

In addition, the adhesion strength was excellent in the following case, but the surface of the plaster was not slippery due to the roughness of the surface.

In order to remove the foreign matter caught in the groove formed by hitting, it is washed alternately with hot water and cold water using an injector, and before coating, the coating reaction is most effective at 40-50 ℃ due to hot water or separate preheating. It was found that the coating liquid was pushed out by the air pressure of the air spray because the curing rate of the coated ceramic liquid was too slow due to the low temperature of the coating material.

In addition, in the state of preheating to a higher temperature there was a problem that the coating ceramic coating liquid solidified too quickly attached.

This is fixed as soon as the air spray is to prevent the alcohol contained in the ceramic coating liquid to fly to cause the play.

In addition, since it adheres immediately, the smoothness of the surface is lowered and the quality of the product is lowered.

In addition, the thickness of the coating was ideally 20-30μ, and below 20μ, the concealment rate was weak, so the light color had insufficient hiding power, and if it was more than 30μ, there was a possibility of cracking after drying. .

This phenomenon should increase slowly from low to high temperature because the temperature rises so fast that it sticks before it spreads finely.

As the most suitable conditions of drying temperature in the coated state as described above, when firing at 180-220 ℃ for 30 minutes, the most stable firing was found to be excellent in plastering and stable firing was possible even at higher temperatures. In terms of falling off.

In addition, the firing temperature was heated to 230-270 ° C. for 25 minutes, and the result showed that the glossiness of the plaster was inferior due to the phenomenon of filling on the coated object. However, it was found that the glossiness was significantly lowered.

In addition, when the temperature was set to 350 ° C., a film was formed, but hair crevices were formed, resulting in a play.

In addition, even if the temperature is 120-170 ℃ excellent gloss and strength was found to be excellent, but the drying time was longer than 1 hour was found to fall in economic efficiency.

In addition, it was found that the scratch was very low because the strength was low even though it took 4 hours or more and 7 days or more at room temperature.

Therefore, the coating film may be formed even at room temperature at 350 ° C., which is the firing temperature of aluminum, but the economical aspect and the best state of the product are most suitable for 30 minutes at 180-220 ° C.

In addition, as a result of rapidly increasing the heating temperature, it can be seen that the pinning starts to occur. As a result of the rapid quenching after the heating, cracks are formed.

Therefore, as the heating conditions, it was found that it is most ideal to slowly heat for 5-10 minutes, heat for 30 minutes at 180-220, and then cool while removing heat for 5-10 minutes to room temperature.

After heating and drying in this way, after being removed from the drying furnace, 1-2 hours were left at room temperature and quenched and quenched to minus 40 ° C. and image 650 ° C., but there was no effect at this time.

Therefore, since the ceramic liquid increases the adhesive strength to the metal plate (including the aluminum plate) at low temperature due to the binder (vehicle) and the pigment is dispersed, the gloss is naturally exhibited, and especially the heat-adhesion is performed within the aluminum recrystallization temperature. There is no transformation.

Claims (1)

Fillers and pigments based on 25-28% filler (ceramic powder), 30-40% binder (vehicle), 30-40% solvent (alcohol), and 5-12% pigment (0.5-1μ) Was prepared by mixing with a solvent in a ratio of 1: 1 and sufficiently dispersed in a ball mill, and then mixing with a binder in a gel state of 6: 4 and stirring vigorously at 5000 RPM for 1 hour, and then stirring 4 hours at 500-1000 RPM. Method for producing a ceramic coating liquid.