KR0139865B1 - Anti-abrasion paint and manufacturing method of steel blackboard thereby - Google Patents

Abstract

The present invention is a paint-drying cupper paint for excellent abrasion resistance and durability that can be used as a marker pen and an iron blackboard coated with the paint, and use an aqueous, water-soluble, oil-based marker pen without using chalk, It prevents damage to the human body and the environment and at the same time has a writing surface on the green background, which eliminates the diffuse reflection and visual fatigue of the high-gloss white board, which can be used as a teaching board. When used, the efficiency of the work can be increased, and the mass production can be performed, thereby reducing the cost of producing the blackboard.

Description

Heat-drying wear-resistant paints that can use marker pens and methods of manufacturing steel boards coated with these paints

The present invention relates to a method of manufacturing a heat-drying wear-resistant paint that can use a marker pen and an iron board coated with the same, and in particular, to have a paint surface having excellent abrasion resistance and durability, and having good paintability and eraseability at the same time. The present invention relates to a heat-drying wear-resistant paint capable of using a marker pen having a green background color to relieve diffused reflection and eye fatigue caused by an iron and a method of manufacturing an iron board coated with the same.

In general, a blackboard for education or communication is divided into a green board and a white board, and wood boards that can be glued and assembled using plywood, etc., and iron boards that can be heat-cured according to the base material. Can be classified into chalk and marker pens according to writing instruments.

Such a conventional blackboard is accompanied with problems such as eye fatigue due to the complexity of the manufacturing process and color, adverse effects on the human body and the environment due to the dust of chalk powder, and in the case of the wooden blackboard, the lack of wood and the complexity of the manufacturing process There is a problem of productivity decrease due to the extension of the production period of the blackboard.

On the other hand, in the case of a green blackboard, a blackboard using wood and steel is manufactured and used as a base material as disclosed in Korean Patent Publication No. 93-8158, but since writing instruments must be used as chalk, environmental pollution due to dust of chalk powder And serious problems such as acting as a cause of respiratory failure in the human body.

In the case of white boards (including whiteboards) made of enamel, it is possible to protect the human body and the environment from the dust of chalk powder with the use of marker pens, but it is easy to feel the diffuse reflection and eye fatigue caused by the glossy luster. It is not suitable for educational purposes.

The object of the present invention is to develop a result of a long research in view of the problems with the conventional blackboards as described above, by having a green base iron board surface that can be used for marker pens such as aqueous, water-soluble, oily, not chalk Heat-drying wear-resistant which can escape from the damage of dust caused by chalk powder and at the same time eliminates the diffuse reflection and visual fatigue caused by the white surface of the board. It also has excellent wear resistance, solvent resistance and excellent durability. The present invention provides a method of manufacturing a paint and a steel blackboard coated with the same.

In order to achieve the above object, the present invention is a mixture of 50 to 140% by weight and high purity quartz filler, zirconia, and nitride, based on 100% by weight of thermosetting resin, such as silicone-modified polyester resin, polyester resin, and acrylic resin. 200 to 330% by weight of ceramic pigments, rust preventive pigments and colored pigments having excellent abrasion resistance such as boron and molybdenum disulfide are mixed and dispersed to have a particle size of 25 microns or less.

A solid state of 3.0 to 20% by weight of a crosslinking agent, 2.0 to 15% by weight of functional resin solids such as epoxy resins and urethane resins, and 1.0 to 7.0% by weight of a mixed additive are added to 100% by weight of solids of the dispersion mixture. The paint was prepared by mixing the coating material, and the paint thus prepared was roll coated or curtain flow coater method so as to have a thickness of 13 to 22 microns on a hot dip galvanized steel sheet coated with a 4 to 6 micron thick undercoat. It was coated with a drying temperature (PMT: peak metal temperature) at 200 ~ 250 ℃ to prepare a coated steel sheet.

The steel plate coated with the paint and the assembled frame made by adhering the plywood or the plastic sound absorbing material were attached thereto to prepare a steel board coated with a heat-drying wear-resistant paint capable of using a marker pen.

The paint of the present invention is very fast drying time and can be mass-produced in a short period of time by continuous automation of the coated steel sheet process according to the coating method, as well as the manufacturing process of the steel blackboard is very simple and the finished steel blackboard is chalk writing instruments In addition, the use of a marker pen such as aqueous, water soluble, oily, etc. has a very excellent characteristic that a conventional blackboard can not have.

In other words, it has a high hardness coating and excellent water resistance, durability, pillability and erasing properties, workability and water retention and productivity are excellent economically very useful effect.

Example 1

* Mixed Solvent = Ethylene Glycol Monobutyl Ether + Diethylene Glycol Monobutyl Ether + Butanol + Aromatic Petroleum Naphtha

** Mixed additives = defoamer + smoother + slipper + surfactant

According to the above weight blending ratio, a mixed solvent as a solvent (b) is added to a silicone-modified polyester resin of thermosetting resin (A), and the pigment (C) is added and dispersed uniformly while stirring at a stirring speed of 1000 to 2000 rpm for 20 to 30 minutes. A softener, such as a dyno mill, is softened to a particle size of 25 microns or less, and then a paint prepared by mixing a crosslinking agent (D), an epoxy resin as a functional resin (E), and a mixed additive as an additive (F) in order. Clean the surface with alkali degreasing agent, coat chromium (20 ~ 60mg / ㎡) with roller coater, dry it to 60 ~ 80 ℃ (hot air cooling), and then apply the paint for coating to have a dry film thickness of 4 ~ 6 micron. The coated galvanized steel sheet (hereinafter referred to as a galvanized steel sheet) was coated in a roll coater method so as to have a dry coating thickness of 15 ± 2 microns to prepare a coated steel sheet. The dry film specific gravity of the steel sheet was 1.92 ± 0.05 and the drying conditions were dried for approximately 30 seconds to 120 seconds until the maximum surface temperature (PMT) of the steel sheet reached 241 ° C.

The steel sheet thus prepared was attached to a frame with plywood or a plastic sound absorbing material to prepare a steel board.

Example 2

According to the weight ratio, the coating was prepared in the same manner as in Example 1, but was prepared by mixing a urethane resin in place of the epoxy resin of Example 1 as the functional resin (e). A steel sheet coated with a coating was prepared by coating in a roll coater method so as to be 20 ± 2 microns. The dry film specific gravity of the steel sheet was 1.90 ± 0.05 and the drying conditions were dried for approximately 30 to 120 seconds until the maximum surface temperature of the steel sheet reached 241 ° C.

Example 3

According to the weight ratio, the compounding was carried out in the same manner as in Example 1, except that the functional resin was coated and dried on a galvanized steel sheet under the same conditions as in Example 2, which was prepared by mixing.

Example 4

According to the weight blending ratio, the same method as in Example 1 was used, except that the thermosetting resin (A) was replaced with a polyester resin and the functional resin (E) was replaced with a urethane resin. Was coated by a curtain flow coater method so as to be 20 ± 2 microns to prepare a coated steel sheet.

The dry film specific gravity of this steel sheet was 1.91 ± 0.05 and the drying conditions were dried for approximately 30 to 120 seconds until the maximum surface temperature of the steel sheet reached 235 ° C.

Example 5

According to the weight blending ratio, but in the same manner as in Example 1, the coating prepared by replacing the thermosetting resin (A) with an acrylic resin, the dry coating film thickness of 15 ± 2 microns in Example 1 Painted by a spray coating method as possible to prepare a steel plate coated with a coating. At this time, the specific gravity of the dry coating film of the steel sheet was 1.92 ± 0.05, and the drying conditions were dried for 25 to 35 minutes at an ambient temperature of 170 ° C.

The performance test results of the steel blackboard coated with a heat-drying wear-resistant paint that can be used by the marker pen manufactured by the above embodiments are as follows.

[Performance Test Result Table of Steel Blackboard Coated with Heat-Resistant Abrasion-resistant Paint for Marker Pen]

[Test Methods]

Gloss: Mirror gloss measurement value of coating film using 60 ° gloss meter.

Pencil Hardness: The highest grade without the appearance of iron (iron base) by scraping drawings with Mitsubishi Uni-pencil.

Solvent resistance: After gauze (Medicine gauze No. 3) is wrapped in 5 layers on the tip of index finger and middle finger well, soaked in MEK solvent sufficiently and rubbed the coating film 50 times.

Marker pen applicability: The degree to which marker pen can be easily written.

Erasability: Easily erased when erased with a marker pen eraser.

Contamination: The degree of contamination of the marker pen ink after erasing with an eraser.

Abrasion resistance: Surface condition after 100 rotations with wear ring CS-10 using wear tester.

Claims (2)

In a chalkboard-making coating material in which a crosslinking agent is mixed with a silicone-modified polyester resin, a polyester resin, or an acrylic resin, as a thermosetting resin, with respect to the silicone-modified polyester resin, the polyester resin, or 100% by weight of the acrylic resin solid content 50 to 140% by weight of a mixed solvent (ethylene glycol monobutyl ether + diethylene glycol monobutyl ether + butanol + aromatic petroleum naphtha) and 200 to 330 weight% of ceramic pigments, rust preventive pigments and coloring pigments, and the particle size is 25 microns or less. After dispersing and softening so that the crosslinking agent (amino resin) cross-linking (3.0% by weight of the crosslinking agent (amino resin)) and 2.0-15% by weight of the epoxy resin or urethane resin as a functional resin and a mixed additive (defoamer) + Smoothing agent + slip agent + surfactant) by adding 1.0 to 7.0% by weight of the mixture Heat-drying wear-resistant paint for steel blackboards that can be used with marker pens. Cleaning the surface of the galvanized steel sheet as an alkali degreasing agent; Chromium coating the surface of the cleaned galvanized steel sheet at 20 to 60 mg / m 2 as a roller coating machine, drying the film at 60 to 80 ° C., and then applying a coating material having a dry coating thickness of 4 to 6 microns; Coating the paint for the board to a dry coating thickness of 13 to 22 microns on a galvanized steel sheet coated with a paint for the undercoat by a roll coating, curtain flow coating, or spray coating method; And a method of manufacturing a steel blackboard coated with a heat-drying wear resistant paint that can be used for a marker pen, the method comprising: attaching a steel plate coated with a paint for blackboard to a plywood or frame.