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Preparation method for water-soluble non-toxic dust-free chalk

A water-soluble, chalk technology, applied in pencil leads, household utensils, applications, etc., can solve the problem of not very obvious reduction effect of chalk dust pollution, and achieve the effects of smooth writing, simple operation and reasonable formula

Inactive Publication Date: 2018-11-16
广安市广安区东方小学校
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It just adds grease or 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, making it easy to clean. Scattering, but in practical applications, its effect on reducing chalk dust pollution is not very obvious

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Put 10kg of palm oil, 5kg of fatty alcohol polyoxyethylene ether, 0.5kg of sodium carboxymethylcellulose and 1kg of glycerin into the same container, heat to 50°C, and stir for 0.2h with a mixer to obtain a premix. The number is 1500r / min.

[0030] (2) Add 20 kg of titanium dioxide, 1 part of nano-calcium carbonate and 100 kg of water into the premix, keep the temperature at 50° C., stir for 1 hour, and the rotation speed of the mixer is 2000 r / min to obtain a raw material solution.

[0031] (3) Pour the raw material liquid into the forming mold, cool to room temperature, and then squeeze out the mold to obtain the finished product.

Embodiment 2

[0033] (1) Add 15kg of palm oil, 10kg of sodium lauryl sulfate, 3kg of sodium carboxymethylcellulose and 5kg of polysorbate into the same container, heat to 80°C, and stir for 1 hour with a mixer to obtain a premix. The number of revolutions of the mixer is 2000r / min.

[0034] (2) Add 40kg of titanium dioxide, 5kg of nano-calcium carbonate and 200kg of water into the premix, keep the temperature at 80°C, stir for 2 hours, and the rotation speed of the mixer is 2500r / min to obtain a raw material solution.

[0035] (3) Pour the raw material liquid into the forming mold, cool to room temperature, and then squeeze out the mold to obtain the finished product.

Embodiment 3

[0037] (1) Add 12kg of palm oil, 3kg of fatty alcohol polyoxyethylene ether, 3kg of sodium lauryl sulfate, 0.8kg of sodium carboxymethylcellulose, 0.7kg of glycerin and 0.8kg of polysorbate into the same container, heat to 60°C, Stir with a mixer for 0.5h to obtain a premixture, and the rotation speed of the mixer is 1800r / min.

[0038] (2) Add 25kg of titanium dioxide, 1.5kg of nano-calcium carbonate and 120kg of water into the premix, keep the temperature at 60°C, stir for 1.5h, and the rotation speed of the mixer is 2200r / min to obtain a raw material solution.

[0039] (3) Pour the raw material liquid into the forming mold, cool to room temperature, and then squeeze out the mold to obtain the finished product.

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PUM

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Abstract

The invention discloses a preparation method for water-soluble non-toxic dust-free chalk. The method comprises the following steps: (1) mixing 10-15 parts of palm oil, 5-10 parts of an emulsifier, 0.5-3 parts of sodium carboxymethylcellulose, and 1-5 parts of a moisturizing agent, and performing heating and stirring to obtain a pre-mixed substance; (2) adding 20-40 parts of titanium dioxide, 1-5 parts of nano calcium carbonate and 100-200 parts of water into the pre-mixed substance, and performing mixing under stirring to obtain a raw material liquid; and (3) injecting the raw material liquidinto a molding die, and performing cooling extrusion demoulding to obtain the finished product. The preparation method disclosed by the invention has the advantages of simple operation, convenience, quickness, and low costs, and can efficiency prepare a series of white and colored water-soluble non-toxic dust-free chalk; and the method is suitable for industrialized production.

Description

technical field [0001] The invention relates to the field of preparation of dust-free chalk, in particular to a preparation method of water-soluble non-toxic and dust-free chalk. Background technique [0002] Chalk is a widely used writing instrument in teaching. Writing on the blackboard with chalk is to apply gypsum powder on the blackboard. When wiping the blackboard, gypsum dust (chalk dust) floats in the air for a short time and then falls on the surface and the ground near the blackboard. Its particles are larger, mostly above 100 microns, heavier, fall faster, and float in the air for a short time. 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. If it is a substance harmful to the body (such as silicon dioxide, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D13/00
CPCC09D13/00
Inventor 杜先慧蒲小军付婷婷杨顺成冯海霞
Owner 广安市广安区东方小学校
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