Novel dust-free chalk and manufacturing method thereof

Abstract

The invention discloses a novel dust-free chalk and a manufacturing method thereof, and belongs to the field of writing tools. The novel dust-free chalk comprises: by weight, 30 to 40% of calcium carbonate, 10 to 20% of titanium dioxide powder, 15 to 25% of talc powder, 10 to 20% of water-soluble wax, 5 to 10% of glycerin and 5 to 10% of vaseline. The manufacturing method of the novel dust-free chalk comprises the following steps of putting water-soluble wax and vaseline into a container with a heating and stirring device, heating to fusion, keeping a temperature in a range of 70 to 80 DEG C, adding respectively calcium carbonate, titanium dioxide powder, talc powder, glycerin and an appropriate amount of water into the container, stirring uniformly, pouring the mixture into a chalk mold to carry out injection molding, and carrying out demolding after solidification. The novel dust-free chalk obtained by the manufacturing method maintains humidity always, produces a good cohesive force between powder particles, is not easy for causing falling-off of powder particles, has a smooth surface, is convenient for writing, and reduces an adhesive force produced between a blackboard and handwriting to appropriate intensity so that the handwriting can be erased easily.

Description

technical field [0001] The invention relates to a chalk, in particular to a novel dust-free chalk and a manufacturing method thereof, belonging to writing implements. Background technique [0002] According to relevant data on labor hygiene, dust particles in the air of production and living environments, with a diameter of 10-20 microns or more, are mostly blocked by nasal hairs, nose, pharynx, and throat when inhaled through the nostrils, and adhere to the small airways and alveoli of the mucosa. It accumulates more in the alveoli and small airways, which will cause damage to the human body. Teachers often need to write and draw on the blackboard to explain. In a class, it is necessary to wipe and write several times, and it is inevitable to inhale some chalk dust from the nostrils. For a long time, the chalk dust has been flying, which has constituted a serious hazard to the health of teachers and students. At present, there are some dust chalks on the market that are i...

AI Technical Summary

Problems solved by technology

It just adds polyalcohols to ordinary chalk as a binder, and then adds fillers with a larger specific gravity, such as clay, marl, cement, etc., which can increase the specific gravity and volume of chalk dust and make it difficult to scatter. In practical applications, its effect on reducing chalk dust pollution is not very obvious, and it also has the disadvantage of sticking hands