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Sweat-absorbing environment-friendly chalk and preparation method thereof

A kind of chalk, environmental protection technology, applied in the direction of pencil lead, household utensils, application, etc., can solve the problem of easy breakage of chalk, and achieve the effect of protecting the health of teachers and students, reducing drift, and simple composition of chalk.

Pending Publication Date: 2022-07-01
NANYANG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, both of the above two patents have not solved the problem that the chalk is easy to break and break due to sweating of the hands, and the problem of being unable to write

Method used

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  • Sweat-absorbing environment-friendly chalk and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A kind of sweat-absorbing environmental protection chalk, the chalk comprises the following raw materials in parts by weight: 40 parts of calcium sulfate, 10 parts of aluminum hydroxychloride, moisture absorbing agent γ-Al 2 O 3 8 parts, 5 parts of titanium dioxide, 2 parts of paraffin wax and 3 parts of solvent propyl acetate.

[0025] A preparation method of sweat-absorbing environmental protection chalk, comprising the following steps:

[0026] (1) Weigh each raw material according to the above-mentioned parts by weight, pour aluminum chloride, paraffin, solvent propyl acetate and an appropriate amount of water into a stirring vessel, stir at a stirring speed of 1500 r / min at 80 ° C for 2 h, and stir evenly , get mixture 1, standby;

[0027] (2) Add hygroscopic agent γ-Al to the mixture 1 obtained in step (1) 2 O 3 and titanium dioxide, at 80°C for 2 hours at a stirring speed of 1000 r / min, and after stirring and mixing evenly, add calcium sulfate while stirring...

Embodiment 2

[0030] A kind of sweat-absorbing environmental protection chalk, the chalk comprises the following raw materials by weight: 42 parts of calcium sulfate, 12 parts of aluminum hydroxychloride, 10 parts of hygroscopic agent glycerol, 6 parts of titanium dioxide, 3 parts of paraffin wax and 4 parts of solvent butyl acetate share.

[0031] A preparation method of sweat-absorbing environmental protection chalk, comprising the following steps:

[0032] (1) Weigh each raw material according to the above-mentioned parts by weight, pour aluminum chloride, paraffin, solvent butyl acetate and an appropriate amount of water into a stirring vessel, stir at a stirring speed of 1600 r / min at 90 ° C for 1.8 h, stir Homogeneous, get mixture 1, set aside;

[0033] (2) Add hygroscopic agent glycerol and titanium dioxide to the mixture 1 obtained in step (1), and stir at a stirring speed of 16000 r / min at 90° C. for 1.8 h. After stirring and mixing evenly, at the same stirring speed, while stirri...

Embodiment 3

[0036] A kind of sweat-absorbing environmental protection chalk, the chalk comprises the following raw materials by weight: 45 parts of calcium sulfate, 14 parts of aluminum hydroxychloride, 12 parts of hygroscopic agent glycerol, 7 parts of titanium dioxide, 4 parts of paraffin wax and solvent butyl propionate 5 servings.

[0037] A preparation method of sweat-absorbing environmental protection chalk, comprising the following steps:

[0038] (1) Weigh each raw material according to the above-mentioned parts by weight, pour aluminum chloride, paraffin, solvent butyl propionate and an appropriate amount of water into a stirring vessel, and stir for 1.6h at a stirring speed of 1700r / min at 100°C, Stir well to obtain mixture 1, for use;

[0039] (2) Add hygroscopic agent glycerol and titanium dioxide to the mixture 1 obtained in step (1), stir at a stirring speed of 1700 r / min at 100° C. for 1.6 h, stir and mix evenly, and then stir at the same stirring speed while stirring Cal...

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Abstract

The invention discloses sweat-absorbing environment-friendly chalk and a preparation method thereof. The chalk is prepared from the following raw materials in parts by weight: 40-50 parts of calcium sulfate, 10-18 parts of aluminum chlorohydrate, 8-15 parts of a moisture absorbent, 5-10 parts of titanium dioxide, 2-6 parts of paraffin and 3-8 parts of a solvent. According to the invention, aluminum chlorohydrate is added into the chalk raw materials, aluminum chlorohydrate is subjected to bridging polymerization through hydroxyl groups, and molecules contain the highest number of hydroxyl groups, so that the chalk has relatively strong bridging adsorption performance and hydrophilicity, and has very good adsorption performance on sweat; the chalk can avoid the problem that the chalk is affected with damp and is easy to break and break to cause unsmooth writing or writing failure due to easy sweating of hands in summer, has simple components, does not contain grease components, reduces the use of waxes, liquid paraffin, organic solvents and other raw materials, ensures smooth writing, is easy to erase, and is convenient to use. And the flying of chalk dust is reduced.

Description

technical field [0001] The invention belongs to the technical field of environmental protection cultural and educational supplies, and in particular relates to a sweat-absorbing environmental protection chalk and a preparation method thereof. Background technique [0002] Chalk is an important teaching material in the teaching process of teachers. Traditional chalk is easy to produce pen ash. The micro-ions of traditional chalk ash have a strong ability to absorb bacteria. At the same time, chalk ash contains heavy metals such as cadmium, lead and manganese. These chalk ash floating in the air not only pollutes the air environment, but also causes serious adverse effects on the respiratory tract, skin, ENT and other body parts of teachers and students who are exposed to these harmful bacteria and heavy metals for a long time. Long-term inhalation can cause emphysema and liver damage to the human body. Especially in the hot summer, for teachers whose hands are prone to swea...

Claims

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Application Information

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IPC IPC(8): C09D13/00
CPCC09D13/00
Inventor 张珊郭兴华程斐
Owner NANYANG INST OF TECH