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CN-121652676-B - Hidden lattice writing color-coated plate and preparation method thereof

CN121652676BCN 121652676 BCN121652676 BCN 121652676BCN-121652676-B

Abstract

The application discloses a hidden lattice writing color-coated plate and a preparation method thereof, and relates to the field of color-coated plates. The dark lattice writing color-coated sheet comprises a galvanized steel sheet or a cold-rolled steel sheet, a primer layer, a dark lattice layer and a green surface paint layer, wherein the dark lattice layer is formed by printing dark lattice paint consisting of 14-18wt% of fluorescent pigment, 30-35wt% of polyester resin, 10-12.5wt% of amino resin, 0.1-0.3wt% of acid catalyst, 0.5-0.7wt% of defoamer, 0.5-0.7wt% of flatting agent, 0.5-0.7wt% of wetting dispersant and the balance solvent, and the solvent adopts a mixed solvent of ethyl acetate, isobutanol and butyl ether with the weight ratio of (4-5): (2-3): 3. The hidden lattice writing color-coated plate has long service life and difficult abrasion, the hidden lattice layer can be displayed only in a short distance, and the hidden lattice layer cannot be seen clearly at a distance of more than 2 meters, so that the attractive appearance is not influenced, and the hidden lattice writing color-coated plate is widely applied to teaching in kindergarten and primary school.

Inventors

  • TANG ZUOCHUN

Assignees

  • 佛山市环宇新型材料有限公司

Dates

Publication Date
20260508
Application Date
20260206

Claims (8)

  1. 1. A dark grid writing color coated plate is characterized by comprising a galvanized steel plate or a cold-rolled steel plate, a primer layer, a dark grid layer and a green surface paint layer which are sequentially arranged, wherein the dark grid layer is formed by printing a dark grid paint consisting of 14-18wt% of fluorescent pigment, 30-35wt% of polyester resin, 10-12.5wt% of amino resin, 0.1-0.3wt% of acid catalyst, 0.5-0.7wt% of defoamer, 0.5-0.7wt% of flatting agent, 0.5-0.7wt% of wetting dispersant and the balance solvent, wherein the solvent adopts a mixed solvent of ethyl acetate, isobutanol and butyl ether with the weight ratio of (4-5): 3 (2-3); The polyester resin adopts polyester resin a or a composition of (8-8.5) and (1.5-2) polyester resin b, wherein the polyester resin a has a number average molecular weight of 3000-3500g/mol, a weight average molecular weight of 15000-20000g/mol, a hydroxyl value of 80-90mgKOH/g and an acid value of 10-15mgKOH/g, the polyester resin b has a number average molecular weight of 1800-2200g/mol, a weight average molecular weight of 5000-5500g/mol, a hydroxyl value of 105-115mgKOH/g and an acid value of 5-8mgKOH/g.
  2. 2. The dark lattice writing color coated board according to claim 1, wherein the amino resin is at least one of hexamethoxy methyl melamine resin, n-butanol etherified melamine formaldehyde resin, isobutanol etherified melamine formaldehyde resin, n-butanol etherified melamine formaldehyde resin containing imino groups and methanol etherified melamine formaldehyde resin containing imino groups.
  3. 3. The dark lattice writing color coated sheet of claim 1, wherein the acid catalyst is at least one of p-toluenesulfonic acid, dodecylbenzenesulfonic acid, dinonylnaphthalenedisulfonic acid, blocked p-toluenesulfonic acid, blocked dodecylbenzenesulfonic acid, and blocked dinonylnaphthalenedisulfonic acid.
  4. 4. The dark grid writing color coated board of claim 1, wherein the defoamer is an acrylic ester defoamer or a modified organic silicon defoamer, the leveling agent is an acrylic ester leveling agent, and the wetting dispersant is a polymer modified polyester wetting dispersant.
  5. 5. The dark grid writing color coated sheet of claim 1, wherein the galvanized or cold rolled steel sheet has a thickness of 0.2-0.4mm, the primer layer has a thickness of 4-5 μm, the dark grid layer has a thickness of 5-8 μm, and the green finish layer has a thickness of 28-33 μm.
  6. 6. The dark space writing color coated sheet of claim 1, further comprising a back paint layer, wherein the back paint layer is positioned on one side of the galvanized or cold-rolled steel sheet away from the primer layer, and the thickness of the back paint layer is 7-10 μm.
  7. 7. A method for producing a dark lattice writing color coated sheet as defined in any one of claims 1-6, comprising the steps of: Uniformly coating primer on one surface of a galvanized steel sheet or a cold-rolled steel sheet, and drying to obtain a primer layer; Printing dark grids on the surface of the dried primer layer by using dark grid paint, and drying to obtain a dark grid layer, wherein the dark grid is dried sequentially by a first drying area at 60-80 ℃ and a second drying area at 140-150 ℃; And uniformly coating green board finishing paint on the surface of the dark grid layer, and drying to obtain a green board paint layer.
  8. 8. The method for preparing a dark place writing color coated plate according to claim 7, further comprising the steps of coating a back paint on one side of the galvanized steel sheet or the cold-rolled steel sheet, which is away from the primer layer, and drying to obtain the back paint layer.

Description

Hidden lattice writing color-coated plate and preparation method thereof Technical Field The application relates to the field of color-coated plates, in particular to a dark lattice writing color-coated plate and a preparation method thereof. Background The writing color-coated board is used as a common writing board and has wide application in offices, teaching and other scenes. In teaching life, in order to guide pupil to write in order, a writing color-coated plate with a grid shape is usually needed. At present, the existing writing color-coated plate has some defects. For example, the writing color-coated plate with the lattices is printed on the surface, and the printed lattices are easy to wear, fade and the like in the long-term use process, so that the service life is greatly shortened. Disclosure of Invention In order to solve the problems that writing color-coated plates with grids in the related art are easy to wear and short in service life, the invention provides a dark grid writing color-coated plate and a preparation method thereof. In a first aspect, the application provides a dark grid writing color coated board, which adopts the following scheme: The dark grid writing color coated plate comprises a galvanized steel plate or a cold-rolled steel plate, a primer layer, a dark grid layer and a green surface paint layer which are sequentially arranged, wherein the dark grid layer is formed by printing dark grid paint consisting of 14-18wt% of fluorescent pigment, 30-35wt% of polyester resin, 10-12.5wt% of amino resin, 0.1-0.3wt% of acid catalyst, 0.5-0.7wt% of defoaming agent, 0.5-0.7wt% of flatting agent, 0.5-0.7wt% of wetting dispersant and the balance solvent, wherein the solvent adopts a mixed solvent of ethyl acetate, isobutanol and butyl ether with the weight ratio of (4-5): (2-3): 3. Aiming at the problem that the existing hidden lattice layer is arranged on the green surface paint layer and is worn after long-time use, the hidden lattice writing color-coated plate disclosed by the application is arranged below the green surface paint layer, and the hidden lattice layer cannot be worn due to long-time use under the protection of the green surface paint layer, so that the integrity of the hidden lattice layer can be effectively maintained, and the service life of the hidden lattice writing color-coated plate is prolonged. In addition, the dark grid layer can only be displayed in a short distance, and the dark grid layer cannot be seen clearly at a distance exceeding 2 meters, so that the dark grid layer has a stealth effect and does not influence the attractiveness. In the application, the dark grid layer takes the polyester resin as a film forming material, takes the amino resin as a cross-linking agent and a curing agent, and under the action of an acid catalyst, the amino resin reacts with hydroxyl in the polyester resin to promote the film formation of the polyester resin, improve the hardness of a paint film and improve the wear resistance of the paint film. The defoaming agent can effectively eliminate bubbles generated in the preparation and use processes of the dark grid paint, avoid paint film defects caused by the bubbles, and ensure the flatness and quality of the dark grid layer. The fluorescent pigment has the main function of facilitating the display of the dark grid layer, and any fluorescent pigment which can permeate the green surface paint layer and can be clearly displayed can be adopted. The leveling agent can reduce the surface tension of the dark grid paint and assist the dark grid paint to realize uniform spreading after printing. The wetting dispersant can improve the dispersibility of each component in the dark grid paint, so that the fluorescent pigment can be uniformly dispersed in the solvent, the agglomeration phenomenon is avoided, and the color uniformity of the dark grid layer is ensured. The solvent adopts the mixed solvent of ethyl acetate, isobutanol and butyl ether in a specific proportion, and the specific mixed solvent is matched with the flatting agent, the wetting dispersant, the defoamer and the like, so that the clear, uniform, complete and continuous dark grid layer is formed by the dark grid paint, the method is particularly suitable for processing the dark grid layer with the line width of less than 1mm, the problems of sawtooth, broken line or ink accumulation at the intersection point of the dark grid layer and the like are avoided, and the appearance quality of the dark grid layer can be improved. In addition, the top-coat layer of the dark-lattice writing color-coated board adopts a green top-coat layer, and compared with a conventional white top-coat layer or a conventional blackboard top-coat layer, the green top-coat layer is the gentlest to eyes and is not easy to cause glare or fatigue after long-time fixation. In some preferred embodiments, the fluorescent pigment is the purple fluorescent pigment Panax VIOLET FL605 of korean rising.