Traditional Chinese Paint for blackboard: Workshop Formula, Ratios & Method
In short: Traditional Chinese Paint for blackboard. This entry documents a formula & ratios taken from Chinese practical-technology literature, written for small-scale makers and home producers. The text below is the full English translation of the original Chinese workshop notes, covering materials and quantities, the step-by-step sequence, and the practical cautions recorded in the source. Roughly 4548 words of English technical text, translated and preserved without editing. It is intended for experimental and reference use, not for regulated or commercial certification.
paint for blackboardThere are several special requirements for blackboard coatings. First, it must be able to clearly reflect handwriting and leave no traces after wiping. Second, it must have a certain degree of wear resistance to extend the service life of the blackboard coating. At present, dust-free chalk has been widely used abroad, which puts forward higher requirements for blackboard coatings.The special blackboard coating developed by Nihon Hashizume Yasuro is introduced as follows:The main components forming the coating film are synthetic resins and inorganic fillers. Resins that can be used include self-bridging acrylic resin, saturated polyester such as alkyd resin, thermosetting resin such as epoxy resin, polyurethane, and bridging agents. Bridging agents include amino resins such as melamine resin and urea resin, and blocked isocyanates. Among the above materials, it is best to use acrylic resin and alkyd resin, and use blocked isocyanate as the bridging agent. The weight ratio of the two is 1:0.2~1. Inorganic fillers include calcium carbonate, titanium oxide, magnesium oxide, alumina, silicate powder, barium sulfate, clay, talc, etc., and the particle size is preferably 10 to 30 μ. The added glass frits include glass beads with a particle size of less than 80 μ, glass powder with a particle size of less than 80 μ, glass flakes with a thickness of 1 to 7 μ and a particle size of less than 50 μ, glass fibers with a diameter of less than 20 μ and a length of less than 100 μ, etc. It is best to use materials below 40μ for glass beads. If the selected material exceeds the upper limit, the coating surface will be uneven.The amount of inorganic additives relative to the resin material is, for example, when the weight of the resin is 100, the amount is 50 to 200, and the amount of glass frit is 15 to 100 relative to the above mixing amount. In addition, appropriate amounts of solvents and coloring pigments should be added. …
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