Writing board coated with surface-modified paint and writing liquid matched with writing board

Abstract

The invention provides a writing board coated with surface-modified paint and a writing liquid matched with the writing board. The writing board is produced by coating a layer of developing paint on an undertint matte base plate, wherein the developing paint is prepared by the following steps of: dissolving thymolphthalein into ethanol; adding glutaric dialdehyde and reacting at the temperature of 40-60DEG C for 0.5-1.5 hours; adding xylene, acetone and polyurethane and uniformly stirring; and finally, adding a bonding agent and fully stirring. The writing liquid matched with the writing board is prepared by the following steps of: dissolving NaOH or KOH into water; adding ethanol; and finally, adding a flavoring agent and uniformly stirring. The writing liquid can write blue handwriting on the writing board and the handwriting can be wiped with wet cloth. The writing board disclosed by the invention is simple in process; the paint used once can be repeated used for over 6 months; and the used writing liquid is simple, practical and economic in formula. The writing board and the writing liquid are suitable for occasions having various writing demands, such as schools, families and office.

Description

technical field [0001] The invention relates to teaching utensils, in particular to a writing board coated with a surface-modified paint and its supporting writing liquid. Background technique [0002] In order to overcome the problem of blackboard chalk dust pollution, a lot of dust-free writing boards and writing fluids thereof have occurred on the market. Such as patent CN100355843C and CN100432165C disclose a kind of blue writing fluid and a kind of red writing fluid respectively. The used writing board panels of these writing fluids can be smooth glass, beige or milky white sub-gloss color steel plates, plastic plates and the like. Fundamentally solved the dust pollution, greatly improved the teaching environment. However, these products also have deficiencies. After writing on the dust-free board, it needs a special scrubbing solution, and the erasing effect is not ideal. Patent CN1186410C discloses a kind of whiteboard writing fluid. The writing solution is compos...

AI Technical Summary

Problems solved by technology

Its writing is easily erased by water, and no writing liquid shadow will be formed on the writing board