Environment-friendly blackboard biological coating

Abstract

The invention discloses an environment-friendly blackboard biological coating which comprises the following components in parts by weight: 15-30 parts of thermoplastic resin, 20-25 parts of thermosetting plastics, 10-15 parts of alcohol-soluble resin, 3-6 parts of Schefflera chips, 2-6 parts of Norfolk Island Pine, 1-2 parts of alstonia scholaris chips, 2-5 parts of eucalyptus chips, 1-2 parts of rutile titanium dioxide, 3-9 parts of ferrous chloride, 10-16 parts of magnesium oxide, 8-12 parts of hydrochloric acid and 1 part of sodium dodecyl sulfate. A blackboard disclosed by the invention is convenient to produce, clean and sanitary in writing, good in writing quality, low in price, good in wearability, not easy to age and long in service life and does not deform or crack.

Description

technical field [0001] The invention relates to an environment-friendly bio-coating for blackboards. Background technique [0002] Must use blackboard when teaching, existing blackboard has gone through several stages such as cement blackboard, wooden blackboard, frosted glass blackboard, metal blackboard generally. Among them, cement blackboards and wooden blackboards belong to the first generation of products. Their disadvantages are that they are dusty and reflective, which is not good for the physical and mental health of teachers and students. In addition, they are easy to slip during the writing process. Cement blackboards are also easy to condense water droplets in rainy days. The two kinds of blackboards need to be maintained every year. The frosted glass blackboard belongs to the second-generation blackboard. Its disadvantages are that it is dusty, difficult to clean, and easy to break. The metal blackboard belongs to the third-generation blackboard. Its disadvantag...