CN101705034B - Water-soluble dustfree chalks - Google Patents

Abstract

The invention relates to the technical field of chalks, in particular to water-soluble dustfree chalks. The water-soluble dustfree chalks consist of the following components in percentage by weight: 25 to 43 percent of titanium white powder, 15 to 30 percent of fatty alcohol polyethenoxy ether, 10 to 25 percent of glyceroltristearate, 12 to 25 percent of stearic acid, 3 to 9 percent of calcium sulfate and 0.1 to 2 percent of talc powder. In the water-soluble dustfree chalks, the titanium white powder and the calcium sulfate, both bigger in specific gravity, are used, and simultaneously the glyceroltristearate and the fatty alcohol polyethenoxy ether, which are the materials having a bonding action, are also added, so that the specific gravity and the volume of chalk dust are both increased, and when the chalk is used, slipping is not caused, no chalk dust is generated, the chalk can be used on wet or dry blackboards as well as non-water absorbing materials of glass, resin and the like, and because of the addition of the talc powder and the water-soluble fatty alcohol polyethenoxy ether, which have a lubricating effect, the blackboard which is written on with the chalk can be easily erased; and the chalk does not contain volatile organic solvents and is nonpoisonous and tasteless.

Description

A kind of water-soluble non-dust chalk

Technical field

The present invention relates to the chalk technical field, be specifically related to a kind of water-soluble non-dust chalk.

Background technology

So far, the whole world still has billions of Faculty and Students just being full of the classroom of chalk dust, and a lot of experiments and invention want to make the injury of teaching away from dust, therefore the blank pen occurred, products such as projector, and attempt replaces traditional chalk by these products.

Though the blank pen has the few characteristics of Dust Capacity, the organic solvent volatilization that the ink in the blank pen is used is fast, easily causes the dry and hard of blank pen, and organic solvent is also harmful to human body, easily skid during use, owing to these reasons, the use of blank pen is not popularized all the time; Projector is a high-tech product, because cost is too high, has limited the scope of its use greatly.

People do not stop the research to dust-free chalk all the time, and have done many effort and exploration, have obtained certain effect yet.For example the patent No. is that the Chinese patent of CN03116537.0 discloses and a kind ofly mixes the dust-free chalk that forms through casting, oven dry with titanium dioxide, talcum powder, water with water soluble wax, glycerine, and it is a kind of with CaCO that the patent No. is that the Chinese patent of CN200610046902.4 discloses ₃And Ca (HCO ₃) ₂, paraffin is the dust-free chalk of raw material, the effect of these dust-free chalks is all good than the aforementioned conventional chalk, does not solve but the chalk dust pollution problems is also basic.

Summary of the invention

The water-soluble non-dust chalk that the purpose of this invention is to provide a kind of no dust pollution.

The object of the present invention is achieved like this:

A kind of water-soluble non-dust chalk, by weight percentage, form by following raw material:

Titanium dioxide 25～43%;

Fatty alcohol-polyoxyethylene ether 15～30%;

Tristearin 10～25%;

Stearic acid 12～25%;

Calcium sulfate 3～9%;

Talcum powder 0.1～2%;

The general formula of wherein said fatty alcohol-polyoxyethylene ether is RO-(CH ₂CH ₂O) _n-H, wherein the number of carbon atom is 16～18 among the R, n=9～30.

Preferably, a kind of water-soluble non-dust chalk, by weight percentage, form by following raw material:

Titanium dioxide 28～40%;

Fatty alcohol-polyoxyethylene ether 18～27%;

Tristearin 12～22%;

Stearic acid 15～20%;

Calcium sulfate 4～8%;

Talcum powder 0.5～1.5%.

More preferred, a kind of water-soluble non-dust chalk, by weight percentage, form by following raw material:

Titanium dioxide 35.9%;

Fatty alcohol-polyoxyethylene ether 21.8%;

Tristearin 18%;

Stearic acid 17.5%;

Calcium sulfate 5.8%;

Talcum powder 1%.

Described titanium dioxide is an anatase titanium dioxide.

A kind of water-soluble non-dust chalk comprises being prepared as follows step:

(1) general's following raw material by weight percentage: titanium dioxide 25～43%, fatty alcohol-polyoxyethylene ether 15～30%, tristearin 10～25%, stearic acid 12～25%, calcium sulfate 3～9%, talcum powder 0.1～2%, join in the stirring tank and stir, mix;

(2) mixture that step (1) is obtained is injected in the chalk mould;

(3) with the demoulding after the mixture compacted moulding in the above-mentioned chalk mould, promptly obtain the finished product water-soluble non-dust chalk.

Beneficial effect of the present invention is: this water-soluble non-dust chalk, by weight percentage, form by following raw material: titanium dioxide 25～43%, fatty alcohol-polyoxyethylene ether 15～30%, tristearin 10～25%, stearic acid 12～25%, calcium sulfate 3～9%, talcum powder 0.1～2%, the present invention has adopted bigger titanium dioxide of proportion and calcium sulfate, the tristearin of Jia Ruing simultaneously, fatty alcohol-polyoxyethylene ether can play the material of cohesive action, the proportion and the volume of chalk dust are all increased, non-slip when writing, do not produce chalk dust, not only can on blackboard wet or that do, write, can also be at glass, use on the non-water-absorbent material such as resin, the talcum powder of lubricate and water miscible fatty alcohol-polyoxyethylene ether are wiped the present invention easily, and the present invention does not contain volatile organic solvent, and is nonpoisonous and tasteless.

Embodiment

Below in conjunction with embodiment the present invention is done explanation in further detail.

Embodiment 1

A kind of water-soluble non-dust chalk, by 100 parts of weight, form by following raw material:

25 parts of titanium dioxides;

30 parts of fatty alcohol-polyoxyethylene ether;

20 parts of tristearins;

15.9 parts of stearic acid;

9 parts in calcium sulfate;

0.1 part of talcum powder.

The general formula of wherein said fatty alcohol-polyoxyethylene ether is RO-(CH ₂CH ₂O) _n-H, wherein the number of carbon atom is 16～18 among the R, n=9～30.

Described titanium dioxide is an anatase titanium dioxide.

A kind of water-soluble non-dust chalk comprises being prepared as follows step:

(1) with 25 parts of titanium dioxides, 30 parts of fatty alcohol-polyoxyethylene ether, 20 parts of tristearins, 15.9 parts of stearic acid, 9 parts in calcium sulfate, 0.1 part of talcum powder joins in the stirring tank and stirs, and mixes;

(2) mixture that step (1) is obtained is injected in the chalk mould;

(3) with the demoulding after the mixture compacted moulding in the above-mentioned chalk mould, promptly obtain the finished product water-soluble non-dust chalk.

Embodiment 2

A kind of water-soluble non-dust chalk, by 100 parts of weight, form by following raw material:

35.9 parts of titanium dioxides;

21.8 parts of fatty alcohol-polyoxyethylene ether;

18 parts of tristearins;

17.5 parts of stearic acid;

5.8 parts in calcium sulfate;

1 part of talcum powder.

The general formula of wherein said fatty alcohol-polyoxyethylene ether is RO-(CH ₂CH ₂O) _n-H, wherein the number of carbon atom is 16～18 among the R, n=9～30.

Described titanium dioxide is an anatase titanium dioxide.

A kind of water-soluble non-dust chalk comprises being prepared as follows step:

(1) with 35.9 parts of titanium dioxides, 21.8 parts of fatty alcohol-polyoxyethylene ether, 18 parts of tristearins, 17.5 parts of stearic acid, 5.8 parts in calcium sulfate, 1 part of talcum powder joins in the stirring tank and stirs, and mixes;

(2) mixture that step (1) is obtained is injected in the chalk mould;

(3) with the demoulding after the mixture compacted moulding in the above-mentioned chalk mould, promptly obtain the finished product water-soluble non-dust chalk.

Embodiment 3

A kind of water-soluble non-dust chalk, by 100 parts of weight, form by following raw material:

43 parts of titanium dioxides;

15 parts of fatty alcohol-polyoxyethylene ether;

25 parts of tristearins;

12 parts of stearic acid;

3 parts in calcium sulfate;

2 parts of talcum powder.

The general formula of wherein said fatty alcohol-polyoxyethylene ether is RO-(CH ₂CH ₂O) _n-H, wherein the number of carbon atom is 16～18 among the R, n=9～30.

Described titanium dioxide is an anatase titanium dioxide.

A kind of water-soluble non-dust chalk comprises being prepared as follows step:

(1) general's following raw material by weight percentage: 43 parts of titanium dioxides, 15 parts of fatty alcohol-polyoxyethylene ether, 25 parts of tristearins, 12 parts of stearic acid, 3 parts in calcium sulfate, 2 parts of talcum powder join and stir in the stirring tank, mix;

(2) mixture that step (1) is obtained is injected in the chalk mould;

(3) with the demoulding after the mixture compacted moulding in the above-mentioned chalk mould, promptly obtain the finished product water-soluble non-dust chalk.

This water-soluble non-dust chalk performance of comparing with other products is as follows:

	Common chalk	The blank pen	The present invention	Other dust-free chalks
					Poisonous and harmful substances	Lime powder chromium	The volatilization of organic solvent, poisonous	All be the natural environmental-protective composition, toxicological harmless	The part material is poisonous

Dust	A lot of dust	The black dust	No dust	Low amounts of dust
					Spot on the blackboard and environmental pollution	Be easy to contaminate environment	Being easy to contaminate environment is difficult to wipe	Totally easily wipe	Not exclusively totally be difficult for wiping
The sensation of writing	Smooth	Skid	Smooth	Smooth

Above content is preferred embodiment of the present invention only, and for those of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, this description should not be construed as limitation of the present invention.

Claims (5)

1. water-soluble non-dust chalk is characterized in that: by weight percentage, be made up of following raw material:

Titanium dioxide 25～43%;

Fatty alcohol-polyoxyethylene ether 15～30%;

Tristearin 10～25%;

Stearic acid 12～25%;

Calcium sulfate 3～9%;

Talcum powder 0.1～2%;

The general formula of wherein said fatty alcohol-polyoxyethylene ether is RO-(CH ₂CH ₂O) _n-H, wherein the number of carbon atom is 16～18 among the R, n=9～30.

2. a kind of water-soluble non-dust chalk according to claim 1 is characterized in that: by weight percentage, be made up of following raw material:

Titanium dioxide 28～40%;

Fatty alcohol-polyoxyethylene ether 18～27%;

Tristearin 12～22%;

Stearic acid 15～20%;

Calcium sulfate 4～8%;

Talcum powder 0.5～1.5%.

3. a kind of water-soluble non-dust chalk according to claim 1 is characterized in that: by weight percentage, be made up of following raw material:

Titanium dioxide 35.9%;

Fatty alcohol-polyoxyethylene ether 21.8%;

Tristearin 18%;

Stearic acid 17.5%;

Calcium sulfate 5.8%;

Talcum powder 1%.

4. according to any described a kind of water-soluble non-dust chalk of claim 1～3, it is characterized in that: described titanium dioxide is an anatase titanium dioxide.

5. a kind of water-soluble non-dust chalk according to claim 1 is characterized in that: comprise being prepared as follows step:

(1) general's following raw material by weight percentage: titanium dioxide 25～43%, fatty alcohol-polyoxyethylene ether 15～30%, tristearin 10～25%, stearic acid 12～25%, calcium sulfate 3～9%, talcum powder 0.1～2%, join in the stirring tank and stir, mix;

(2) mixture that step (1) is obtained is injected in the chalk mould;

(3) with the demoulding after the mixture compacted moulding in the above-mentioned chalk mould, promptly obtain the finished product water-soluble non-dust chalk.