Black writing liquid suitable for being written on matt board and erasing agent
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A technology for writing liquid and matte board, applied in the field of ink, can solve the problems of affecting teaching effect, damaging students' eyesight, easy reflection of whiteboard, etc., and achieving the effects of smooth writing, low cost and simple formula
Inactive Publication Date: 2013-07-31
SHANXI UNIV
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Problems solved by technology
However, the whiteboard is easy to reflect light, which will damage the eyesight of students and affect the teaching effect
Although the matte board overcomes the defect that the whiteboard is easy to reflect light, when writing on the matte board with whiteboard writing fluid, most of these writing fluids are easy to penetrate into the matt board and are not easy to erase. left with ink shadows
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Embodiment 1
[0027] The specific formula of black writing fluid for teaching matte board:
[0035] Weigh each component according to the above proportions, put the water-soluble starch in 90.57mL of distilled water, heat and stir until boiling to dissolve completely, cool to room temperature, continue to add acid fuchsin, acid No. 3 green, sodium citrate, fat Alcohol polyoxyethylene ether AEO-9 and glycerin, stir evenly, after standing for 24 hours, filter to make black writing fluid.
Embodiment 2
[0037] The specific formula of black writing fluid for teaching matte board:
[0056] The black writing solution prepared in Examples 1, 2, and 3 for teaching matte boards has been tested, and no precipitation will occur after long-term storage. It has the characteristics of no irritating smell, dust-free, non-toxic, and smooth writing.
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Abstract
The invention provides black writing liquid suitable for being written on a matt board and an erasing agent. The writing liquid comprises the components of acid No.3 green, acid fuchsin, a dispersing agent, a stabilizer, a plasticizer, sodium citrate and distilled water. The erasing agent comprises the components of a reducing agent, a complexing agent, a dispersing agent, an antioxidant, a solidifying agent, sodium carbonate and distilled water. The black writing liquid suitable for being written on the matt board and the erasing agent have simple formulas, easily obtained raw materials and low costs. The writing liquid is prepared by an anaglyphic principle, has the advantages of no toxicity, no odor, no generation of precipitates after the writing liquid is stored for a long time and the like, is smooth to write, is particularly suitable for being written on the teaching matt board. The erasing agent can be used for rapidly erasing writing written by the writing liquid, and no writing liquid shadow exists.
Description
technical field [0001] The invention relates to ink, in particular to a black writing liquid suitable for writing on a matt plate and an erasing agent thereof. Background technique [0002] The blackboard chalk used in traditional blackboard demonstrations produces serious dust pollution during teaching, which endangers the health of teachers and students. In order to solve this problem, researchers have developed a variety of alternatives to chalk. Among them, whiteboard pen writing liquid has the advantages of smooth writing, easy erasing, and dust-free, and is generally accepted by people and put into large-scale use. However, the whiteboard is easy to reflect light, which will damage the eyesight of students and affect the teaching effect. Although the matte board overcomes the defect that the whiteboard is easy to reflect light, when writing on the matte board with whiteboard writing fluid, most of these writing fluids are easy to penetrate into the matt board and are ...
Claims
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Application Information
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