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Erase-free invisible self-eliminating chalk

An invisible, chalk technology, used in pencil leads, home utensils, applications, etc., can solve problems such as non-discovery and health effects

Active Publication Date: 2015-12-23
桐乡宏晨工业设计有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

its health impact
[0003] After searching for Chinese published patents, no solution identical to this patent application was found

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The erasing-free invisible self-eliminating chalk of the present invention is characterized in that: by weight, the material formula is: 30-40 parts of a-naphthol, 100-110 parts of phthalic acid, 100-110 parts of benzoic acid, salicylic acid 150-200 parts, stearic acid 25-30 parts, calcium stearate 10-20 parts, paraffin wax 30-50 parts.

Embodiment 2

[0015] The preparation method of the erasing-free invisible self-eliminating chalk of the present invention is characterized in that: by weight, 30-40 parts of a-naphthol, 100-110 parts of phthalic acid, 100-110 parts of benzoic acid, and 150 parts of salicylic acid -200 parts, 25-30 parts of stearic acid, 10-20 parts of calcium stearate, stir evenly at 120°C, add 30-50 parts of paraffin wax, stir evenly at 120°C, injection mold, cool to form, and obtain this product Invented wipe-free invisible self-eliminating chalk.

[0016] The erasing-free invisible self-eliminating chalk of the present invention has the characteristics that handwriting written on the blackboard will naturally decompose and disappear after 1-2 hours, so as to achieve the purpose of erasing-free.

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PUM

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Abstract

The invention relates to a wiping-free invisible self-disappearing chalk. The wiping-free invisible self-disappearing chalk is characterized in that a formula of the chalk comprises the following materials in parts by weight: 30-40 parts of alpha-naphthol, 100-110 parts of phthalic acid, 100-110 parts of benzoic acid, 150-200 parts of salicylic acid, 25-30 parts of stearic acid, 10-20 parts of calcium stearate and 30-50 parts of paraffin. The wiping-free invisible self-disappearing chalk has the characteristic that words written on a blackboard spontaneously decompose and disappear after one to two hours.

Description

technical field [0001] The invention belongs to a kind of chalk. Background technique [0002] Chalk is a tool widely used in daily life and is generally used for writing on blackboards. Ancient chalk was usually made of natural chalk, but nowadays it is replaced by other substances. The composition of chalk is a white precipitate of calcium sulfate, which is not easily decomposed, and the particles are larger than dust. Now, domestic chalk mainly contains two kinds of common chalk and dust-free chalk, and its main component is calcium carbonate (limestone) and calcium sulfate (gypsum), or contains a small amount of calcium oxide. Chalk is made from calcium sulfate hydrate (commonly known as raw gypsum). Various pigments can also be added to make colored chalk. During the production process, the raw gypsum is heated to a certain temperature to partially dehydrate it into mature gypsum, and then the plaster of paris is mixed with water to form a paste, poured into the mod...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D13/00
Inventor 龙启知李杰严积芳严亚木黄景诚
Owner 桐乡宏晨工业设计有限公司