KR820000518B1 - Method of preparing a poly vinyl chloride plate for black board - Google Patents

Abstract

Poly vinyl chloride plate for black board was manufd. by under-coating mixing solution contg. 1000 silk screen ink, 40 zinc dust, 50 calium carbonate on the poly vinyl chloride plate, then, top-coating mixing soln. contg. 1000 silkscreen ink, 50 calcium carbonate and drying.

Description

Manufacturing method of polyvinyl chloride board for blackboard

The present invention relates to a composition of a blackboard base layer and a method of layering it on a polyvinyl chloride sheet in order to produce a sheet from which the utility of the blackboard can be obtained as a polyvinyl chloride (PVC) sheet.

If polyvinyl chloride sheet is used as a board for blackboard, it has excellent water resistance, light resistance, flexibility, and high stability against chemicals, so it does not have deformation or alteration even when it is rained in the open air. Jena coating agent has a high compatibility with polyvinyl chloride has a defect that was impossible to use because the earth is dissolved when forming the surface layer.

In other words, conventional blackboard boards were coated with various board materials such as wood plywood, tributaries, and hard synthetic resin boards. However, if the board board is made of polyvinyl chloride, ordinary board paints are used. In addition to the polyvinyl chloride resin of the present application, monomers such as ethylene resin, polypropylene resin, polystyrene resin, ABS resin, methacrylic resin, nylon, fluorine resin, polycarbonate resin, polyester resin and the like are bifunctional resins. Due to the high compatibility with the organic solvents in paints, due to the organic solvents contained in 60% or more of the paints, the earth is dissolved before the evaporation of the solvents, and the coating film cannot be formed. Low molecular weight of trifunctional or higher functional monomers such as resins, urea resins, melamine resins, unsaturated polyester resins, and silicon resins Since the resin has a network structure, when the resin is used as a land, the solvent and resin powder do not penetrate into the land and are not dissolved. However, the adhesion between the cured coating film and the earth is weak and the coating film is easily peeled off or partially detached from the surface of the coating film. The more hardened the inner surface is, the more the matting power is lost, the gloss wears out, the paint is not good, and the writing is difficult to read due to the reflection of light rays on the surface of the blackboard. Although it is convenient for the production of the blackboard, there is a problem in the compatibility of the paint and the earth, and the coating layer is not formed, which is impossible for the use of the blackboard.

In order to solve the problem of a blackboard made of polyvinyl chloride as a board for the board, the present invention has a relatively low content of solvent in the coating composition which does not dissolve or deform even when applied to a polyvinyl chloride sheet, and includes resin powder, pigment, and auxiliary agent. It contains 80% or more of phosphorus colorant, and the fast-drying silkscreen ink containing an ether-based quick-drying solvent is used as a coating film element to minimize the dissolution of the earth when forming the coating film and to prevent the quick-drying. Known matting agent, stabilizer, and colorant as adjuvant are used as the undercoat layer, and the admixture containing only the adjuvant in the silkscreen ink is separated into a top coat layer and laminated twice, thereby rapidly evaporating the solvent and By forming an oxide film, a board made of polyvinyl chloride board which increased the interlayer adhesion with the top coat layer As the oxidizing coating agent used in the present invention, zinc dust (Zinc dust), matting agent, calcium carbonate, gypsum, diatomaceous earth, metal powder, stabilizer dibutyl tin, mercaptiated dibutyl tin, colorant The furnace uses either carbon black or phthalocyanine blue.

The coating composition of the present invention is a topcoat layer comprising a composition containing zinc oxidizing coating agent as a oxidizing coating agent and calcium carbonate or diatomaceous earth as a quencher as a top coat layer and a quencher as a top coat layer. A well-known stabilizer and a coloring agent are added, and it is divided into an upper and lower coat layer, and when this invention is explained in full detail according to an Example, it is as follows.

In constructing a board material made of polyvinyl chloride, a composition containing a mixture of silk screen ink, zincation and calcium carbonate is used as a top coat layer, and a composition containing a mixture of silk screen ink and calcium carbonate is applied as a top coat layer. It is characterized by constructing a blackboard surface for vinyl chloride.

Example 1

A mixture of zincated, calcium carbonate, dibutyl tin and dibutyl tin, and carbon black in the weight ratio of the above composition using a silk screen ink as a binder was applied on the polyvinyl chloride sheet as an undercoat layer.

The composition is mixed and coated on the dried undercoating layer to form a top coat.

Example 2

Zinc-ink, cupzoto, mercaptized dibutyl tin, phthalocyanine blue, and carbon black were mixed with the silkscreen ink as a binder, and applied as a undercoat layer on a polyvinyl chloride sheet.

The composition is mixed and coated on the dried undercoating layer to form a top coat.

The present invention uses a silkscreen ink as a binder as a film forming material of polyvinyl chloride sheet. When the ink for silkscreen is applied to a polyvinyl chloride sheet because drying time is short due to a large amount of a colorant instead of a relatively small solvent component. Since the solvent of the composition dissolves and evaporates only on a part of the surface of the earth, the earth has an affinity for tightly adhering to the underlying layer without any external deformation.As a strong oxidizing power to zinc the underlying layer composition, a thin oxidizing film is applied to the surface of the underlying layer. The adhesion to the top coat layer formed and applied is increased. In addition, calcium carbonate in a composition is a well-known quencher in the paint for blackboards with diatomaceous earth, a metal powder, etc.

The present invention thus made is a polyvinyl chloride sheet having the same composition ratio as in the embodiment of the present invention, using a silkscreen ink for which affinity can be generated without dissolving, modifying or altering the polyvinyl chloride. The zinc coating of the oxidizing coating agent of the undercoat layer forms a strong oxidizing coating on the surface of the coating film without changing the physical properties of the coating film between the coating films laminated by forming the chalkboard coating composition for the coating layer, thereby giving excellent adhesion to the top coat layer to be re-coated. Since the coating layer is the same composition, there is no interlayer interface, and even if the top coat layer is worn, the undercoat layer is formed with the same board surface, so that as long as the coating film remains, it can maintain the same quenching properties as the surface of the top coat layer. The same property is excellent in flexibility and water resistance. Water is not absorbed or the board is not changed or deformed, so it can be easily used for field trips, outdoor training, and students' natural learning time.

Claims (1)

A composition consisting of a weight ratio of 1000 parts of silk screen ink, 40 parts of zinc and 50 parts of calcium carbonate was applied to the undercoat layer of polyvinyl chloride, and the composition of 1000 parts of silk screen ink and 50 parts of calcium carbonate was used as a top coat layer. The manufacturing method of the vinyl chloride board for blackboards characterized by the manufacturing process of the coating layer apply | coated each.