CN1226587A

CN1226587A - Erasable writing liquid on yellow board for teaching

Info

Publication number: CN1226587A
Application number: CN 98100828
Authority: CN
Inventors: 范远华
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-02-18
Filing date: 1998-02-18
Publication date: 1999-08-25

Abstract

A erasable writing liquid for yellow education board is prepared from alcohol as solvent, pigment, disperser, emulsifier, erasing agent, lubricant and filming agent through mixing and grinding. It features no poison, no generation of dust, clear trace, easy writing and erasing, and no damage to human body.

Description

Erasable writing liquid on yellow board for teaching

The present invention relates to a kind of teaching board material.Especially can effectively avoid myopia of student, in order to the erasability writing on the blackboard material of the teaching yellow-board of student's eye health.

What existing teaching board used is the chalk of making as major ingredient with terra alba, writing on the blackboard and when erasing the board, dust from flying pollutes the classroom, and harmful instructor is healthy, in order to address this problem, people have developed " dust-free chalk ", and dust-free chalk has added some ferrites and colloid, has reduced dust pollution, but main raw material still be unable to do without terra alba, still do not break away from traditional dried literary style form, therefore, finally do not solve dustless problem.

The Chinese invention patent application number discloses a kind of " water-soluble non-dust chalk " for " 91106154.1 ".It is introduced dustless effect, but its xerotripsis do not fall, need wipe with wet cloth, this has just brought some new problems to writing on the blackboard, and wet water erases the board and can not write immediately, and clipboards such as need dry.Moreover winter, teacher took moist eraser to erase the board with regard to inconvenience.

The objective of the invention is that writing on the blackboard provides a kind of writing on the blackboard material that obtains promising result to teaching yellow-board.It is to adopt water aqua type to write, and changes traditional chalk and does literary style, has brisk fluent, clear easy wiping, dustless nontoxic, free from extraneous odour, the characteristics such as economical and practical of writing.

During use " erasable writing liquid on yellow board for teaching " being contained in special " teaching yellow-board writing on the blackboard pen " writes on teaching yellow-board.

The object of the present invention is achieved like this: be solvent with the edible ethanol, but pigment, dispersion agent, emulsifying agent liniment, lubricant, membrane-forming agent are heated mixed dissolution in edible ethanol, through grinding, reach below 10 microns, more after filtration, leave standstill and get.

Edible ethanol accounts for the 50%-90% of writing liquid total amount.

Pigment: the black writing liquid is selected colour carbon black for use; Red writing liquid is to select that Lithol Red, sun-proof are red, permanent bordeaux is a pigment for use; It is pigment that blue writing liquid is selected pthalocyanine blue for use, and it is pigment that green writing liquid is selected phthalocyanine green for use.Joining secondary color in this way is to allocate and can obtain with above-mentioned several colorants.Pigment accounts for the 2%-10% of writing liquid total amount.

Dispersion agent: adopt sodium methylene bis-naphthalene sulfonate, pigment is better disperseed, increase stability, consumption accounts between the 0.1%-4% of total amount.

Emulsifying agent: select fatty alcohol-polyoxyethylene ether for use, can make after the colo(u)rant dispersion not free settling, and protective colloid, consumption accounts for the 0.5%-7% of writing liquid total amount.

But liniment: select polypropylene glycol for use, the writing on the blackboard writing is very easily wiped on the slave plate.Consumption accounts for the 2%-15% of writing liquid total amount.

Lubricant: polyoxyethylene glycol.Because of polyoxyethylene glycol has stronger water absorbability, plasticity and oilness, after can making the writing liquid writing on the blackboard, keep, and make and leave one deck lubricant film between writing liquid and the teaching yellow-board than moisture state, wipe clean and make to smear on the easy slave plate of person's handwriting, consumption accounts for the 5%-15% of writing liquid total amount.

Membrane-forming agent: select the Nitrocellulose hydroxylated cellulose for use.Consumption accounts for the 2%-9% of writing liquid total amount.

Accompanying drawing is a production technique synoptic diagram of the present invention.

Below in conjunction with accompanying drawing production technique of the present invention is specified that (with preparation black writing liquid is example.)

Edible ethanol is packed in the heating tank 1, then the Nitrocellulose input is heated, constantly stir, wait it fully moltenly clout to be dropped in the lump, stir evenly for behind the colloid, be transported to then and carry out circular grinding in the colloidal mill 2, treat to emit when its granularity reaches below 10 microns, filter, put can only and be finished product through strainer 3.

Claims

1, a kind of erasable writing liquid on yellow board for teaching is characterized in that: edible ethanol is a solvent, but forms with pigment, dispersion agent, emulsifying agent liniment, lubricant, membrane-forming agent, and warp mixes and grinds, the glue mill forms.

2, teaching yellow-board writing liquid according to claim 1, it is characterized in that: solvent wherein is an edible ethanol.Edible ethanol accounts for the 50%-90% of writing liquid total amount.

3, teaching yellow-board writing liquid according to claim 1 is characterized in that: pigment wherein: system black writing liquid is to adopt colour carbon black; Make red writing liquid and adopt Lithol Red, red, the permanent bordeaux of sun-proof; Make blue writing liquid and select phthalocyanine blue for use; Make green writing liquid and select phthalocyanine green for use.Joining secondary color in this way is to allocate and get with above-mentioned four kinds of colorants.Pigment accounts for the 2%-10% of writing liquid total amount.

4, teaching yellow-board writing liquid according to claim 1, it is characterized in that: dispersion agent wherein is a sodium methylene bis-naphthalene sulfonate.Addition is the 0.1%-4% of writing liquid total amount.

5, teaching yellow-board writing liquid according to claim 1, it is characterized in that: emulsifying agent is wherein selected fatty alcohol-polyoxyethylene ether for use.Consumption accounts for the 0.5%-7% of writing liquid total amount.

6, teaching yellow-board writing liquid according to claim 1 is characterized in that: but liniment wherein is a polypropylene glycol.Consumption accounts for the 2%-15% of writing liquid total amount.

7, teaching yellow-board writing liquid according to claim 1 is characterized in that: what lubricant wherein adopted is polyoxyethylene glycol.Consumption is the 5%-15% of writing liquid total amount.

8, teaching yellow-board writing liquid according to claim 1 is characterized in that: membrane-forming agent wherein adopts Nitrocellulose, hydroxylated cellulose.Consumption is the 2%-9% of writing liquid total amount.