Dust-free chalk and manufacture method thereof

Abstract

The present invention discloses a dust-free chalk and a manufacture method thereof. The dust-free chalk comprises a main ingredient and an auxiliary ingredient used as raw materials, wherein the main ingredient is composed of the following components in parts by mass: 10-16 parts of hardened oil, 12-18 parts of stearic acid, 3-6 parts of white beeswax, 1-3 parts of carnauba wax, 2-5 parts of propylene glycol, 1-2 parts of lecithin, 7-12 parts of fatty alcohol polyoxyethylene ether, 6-10 parts of epoxidized soybean oil and 0.1-0.5 part of paraben ester; and the auxiliary ingredient comprises the following components in parts by mass: 30-35 parts of titanium dioxide, 2-5 parts of nano calcium carbonate and 6-10 parts of mica powder. The manufacture method of the dust-free chalk comprises: firstly heating and stirring the main ingredient to obtain an emulsion, adding the auxiliary ingredient, stirring, then injecting the mixture into a mold for molding, condensing and demolding to obtain a finished product. The dust-free chalk has the advantages of good weathering resistance and moisture retention, writing lubricity, bright writing, moderate hardness, low possibility of breakage, no toxicity or odor and no dust generated during using and wiping processes. The selected materials are readily available soluble environmentally-friendly materials, and no pollutants are generated during the production process of the dust-free chalk.

Description

technical field [0001] The invention relates to a dust-free chalk and a manufacturing method thereof. Background technique [0002] Chalk is one of the most widely used traditional teaching tools at present. The main component of traditional chalk is air-setting raw materials, composed of gypsum, calcium carbonate, talcum powder, water and other materials. During the use of traditional chalk, a large amount of fine dust will be generated, which seriously pollutes the indoor teaching environment. These harmful inhalable particles will produce cumulative toxicity to the human body, directly affect the human respiratory tract, heart and lung functions, and seriously damage the health of teachers and students. [0003] At present, there are also organic and inorganic dust-free chalks on the market, but there are shortcomings and deficiencies, mainly in: [0004] 1. The texture is too hard, the handwriting is too thin, and the writing effect is not ideal; [0005] 2. There is a...

AI Technical Summary

Problems solved by technology

[0004] 1. The texture is too hard, the handwriting is too thin, and the writing effect is not ideal;

[0005] 2. There is a peculiar smell, and the irritating bad taste is too strong;

[0006] 3. Poor weather resistance, too low softening point, easy to deform, poor writing ability at high temperature (≥37°C);

[0007] 4. The surface of the chalk is too greasy, sticky and irritating to the skin