KR20050022180A - Method for manifacturing clean board - Google Patents

Abstract

PURPOSE: Provided is a method for manufacturing a clean board that has transparent surface of a paint film, excellent durability and anti-fouling property, and is easy to write and erase letters on its surface. CONSTITUTION: The clean board(10) is manufactured by the steps of: lower-coating the upside of a substrate(11) with thermosetting epoxy resin paint; middle-coating the upside of the lower coated substrate(12) with thermosetting polyester resin paint; and upper-coating the upside of the middle coated substrate(13) with thermosetting resin paint. The upper-coating paint is two liquid-type transparent and thermosetting paint consisting of organic and inorganic compound composition as a main component.

Description

How to Build a Clean Board {METHOD FOR MANIFACTURING CLEAN BOARD}

The present invention relates to a method for manufacturing a clean board, and more particularly, to a method for producing a clean board, which is good to write and erase on a clean board to be expressed using a liquid powder and a marker pen, and has excellent durability and stain resistance.

Generally, a board used for education or communication is divided into a green board used in a classroom of a school and a white board used in an office or a meeting room of a company, and the board is chalked according to writing instruments. Separated for dragons and markers.

In the case of the boards classified according to the writing utensils used as described above, the green board is typically coated with a synthetic resin paint on a hard board such as wood or plywood. The white board is painted to be painted with green color, and the white board is coated with a synthetic resin paint on a board such as wood, paper, plywood, and steel, and then coated with a transparent synthetic paint on the upper surface of the paint. The upper surface of the middle coating is coated with a transparent paint to form a white color.

Therefore, in the case of the green board, since the powdery white chalk that is usually visible to the eyes is used, a lot of dust is generated by the powdery powder during use, which has a problem of adversely affecting not only the human body but also the surrounding environment.

In particular, the young students in the growing season due to the many uses in school had a problem that directly or indirectly adversely affect the human body due to the powdery dust.

 On the other hand, in the case of a white board, since a marker pen filled with ink is used as a writing instrument, dust from powdery powder is not generated as in the green board, thereby protecting the human body and the environment from dust. Due to the high gloss and diffuse reflection due to the gloss of the white background material, there is a problem that the eye fatigue is easily felt.

In addition, in the case of the white board, the surface is mostly treated with a silicone-based paint, which is expensive to manufacture, and after a certain period of use, does the writing mark remain intact due to the characteristics of the water-based writing instrument due to the deterioration of the durability of the surface paint. Had

Recently, in order to improve durability and stain resistance for scratch prevention on the surface of the white board, a relatively hard synthetic resin (PP, PVC, PET) is coated on the surface of the plywood or urethane, UV, homica, fluorine resin on the surface of the synthetic resin. There is a coating or coating such as a coating or a transparent film is produced, or coated with a good transparency such as OPP (Oriented Poly ProPylene).

However, in the case of the white board, it is manufactured by a post coating process, and an expensive coating facility is required at the time of manufacture, and materials required for painting should be stocked, and a painting manpower must be provided separately. There are a number of uneconomical problems.

An object of the present invention is to provide a clean board having a good durability and pollution resistance and transparency on the surface by coating the paint with a green color on the undercoated plate, and by coating a transparent paint on the surface of the medium-coated board.

Another object of the present invention by using a transparent paint coated on the surface of the board painted in green color to improve the sharpness as well as the writing and erasing of liquid chalk and marker pen, providing a clean board that is easy to use as well as to eliminate eye fatigue. I want to.

In order to realize the above object, the present invention includes a base having a relatively hard plate, and the plate surface of the base is made of thermosetting resin by pre-coated metal "PCM". In the board in which the coating is performed in sequence, the top coating is characterized by being coated with a transparent coating which is a thermosetting two-component coating containing the organic-inorganic composite composition as a main component.

Therefore, according to the present invention, since the clean board is transparently coated to the top coating by the leading post-processing method, durability and contamination resistance are improved, and a transparent surface is formed, thereby making it easy to use and reduce eye fatigue.

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

1 is a longitudinal sectional view of a clean board to which the present invention is applied, and the clean board of the present invention should have the following conditions.

 [Condition]

1) Usability

  Liquid chalk and marker pen should be good in use.

2) eraseability

  After writing with liquid chalk and marker pen, the erased state should be good.

3) Pollution resistance

  There should be no contamination after 100 times of writing and erasing with liquid chalk and marker pen.

4) surfactant

  After the surfactant is dropped on the painted surface of the clean board, it is washed with water after 60 hours at 60 ℃, and then dried.

5) Hot water resistance

  The clean board shall be immersed in boiling water for 3 hours, then taken out and dried, and then visually judged.

6) Salt water resistance

  After 500 hours in a 35 ° C. aqueous solution containing 5% sodium chloride, the surface of the coating should be intact.

7) hardness

   Uni pencil should maintain hardness of 3 ~ 5H.

EXAMPLE

The clean board 10 is composed of a base portion 11, which is a steel plate, and a top coat (Primer: 12), a middle coat (Base: 13), and a top coat (Top: 14) on the upper surface of the base 11 (3). Coating is performed sequentially by the three-burn coating method.

The base 11 is made of any one of steel, wood, paper, synthetic resin material.

The undercoat 12 is a thermosetting epoxy resin (trade name KP-8413, YELLOW, construction chemicals) having a viscosity of 70 ~ 90 sec, heating residue 40 ~ 46, specific gravity 1.10 ~ 1.20 on the upper surface of the base 11 ) The coating is coated with a dry thickness of 5 ~ 7 (μ), and the drying condition is dried by 40sec at 204 ~ 210 ℃ for PMT (Peak Metal Temperature).

The middle coating 13 is a thermosetting polyester resin (trade name KP-1513, GREEN, having a viscosity of 90 ~ 110 sec, heating residue 62 ~ 68, specific gravity 1.30 ~ 1.40 on the upper surface of the bottom coating 12) Construction chemicals) paint is coated with a dry thickness of 14 ~ 16 (μ), and the drying conditions are dried and coated in 60sec at PMT 210 ~ 216 ℃.

The top coat 14 is a thermosetting two-component paint having a viscosity of 35 to 45 sec, a heating residue of 32 to 38, and a specific gravity of 0.97 to 1.07 having the organic inorganic composite composition as a main component on the top surface of the middle coating 13 (trade name KP- 3200, CLEAR, construction chemicals) is coated with a dry thickness of 6 ~ 8 (μ), and the drying conditions are dried and coated in 60sec at PMT 230 ~ 250 ℃.

The two-component paint is a transparent paint composed of a main ingredient and a curing agent of 8: 1.

As a result of measuring the clean board 10 capable of using the liquid powder and the marker pen prepared according to the embodiment by a test method, as shown in Table 1 below.

[Test Methods]

Gloss: The specular gloss measurement of the coating film using a 60 ° gloss meter.

Pencil hardness: Whether the base is visible by scraping the surface of the coating film with a uni pencil.

Usability: The degree to which the precision and chromaticity that are easily written when using the liquid pen and marker pen are clearly displayed.

Erase: Liquid powder and marker pen should be erased with eraser after 30 days of use, and easily erased after 72 hours at 40 ~ 50 ℃ of constant temperature dryer.

Pollution: The degree of contamination of liquid powder and marker pen after erasing with eraser.

Table 1

Test Methods Example Remarks Polish 80-85% Mirror gloss measurement with 60 ° polisher Pencil hardness More than 3H UNI-pencil scratches Usability Good Liquid powder, marker pen feeling, color clarity Erase Good 30 days at room temperature, 72 hours after the dryer Pollutant Good Erase 100 times

 As shown in Table 1, the clean board 10 of the present invention appeared to have a surface gloss of 80% or more and a hardness of 3H or more, and was found to be good in the useability, eraseability, and stain resistance of the liquid powder and the marker pen. In view of the above, the surface of the clean board 10 is excellent in transparency, durability and stain resistance.

As described above, the clean board of the present invention is coated with a thermosetting two-component coating containing a thermosetting epoxy resin, a polyester resin, and an organic-inorganic composite composition on the base of the steel sheet in a predetermined drying condition, in a predetermined drying condition. By doing so, the surface of the coating film of the clean board becomes transparent, and the durability and pollution resistance are good, so that it can provide excellent usability and eraseability when using liquid powder and a marker pen.

1 is a longitudinal cross-sectional view of the present invention clean board.

* Description of the symbols for the main parts of the drawings *

10; Clean board 11; Base

12; Sewer 13; Middle coat

14; Painting

Claims (3)

A bottom coat with a thermosetting epoxy resin paint on the upper surface of the base plate; Middle coating with a thermosetting polyester resin paint on the upper surface of the coating; A board made by top coating a thermosetting resin paint on the upper surface of the middle coating, wherein the top coating is made by coating a transparent thermosetting two-component paint mainly composed of an organic and inorganic composite composition. The method for manufacturing a clean board according to claim 1, wherein the transparent thermosetting two-liquid paint is coated with a drying thickness of 6 to 8 (μ) and 60 sec at a maximum surface temperature of 230 to 250 ° C. The method for manufacturing a clean board according to claim 1, wherein the transparent thermosetting two-component coating material is composed of a composition of 8: 1 by a main material and a curing agent.