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Preparation method of attapulgite-based dustless color chalks

A technology of colored chalk and attapulgite powder, applied in pencil lead, non-mechanical pencil, printing and other directions, can solve the problems of flying dust particles, damage to the health of teachers and students, etc. Effect

Inactive Publication Date: 2013-04-24
HUAIYIN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ordinary dusty chalk, in the process of writing and wiping, the dust particles are flying, which seriously damages the health of teachers and students

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1: prepare dust-free colored chalk according to the following method:

[0015] Weigh 1.5 g of sodium polyacrylate and dissolve it in 900 ml of water. Under stirring, slowly add attapulgite powder with a purity of more than 80% and a weight of 300 g through a 200-mesh sieve into the aqueous solution of sodium polyacrylate. Stir continuously at room temperature for 2 hours to obtain attapulgite suspension; add 700 g of plaster of paris powder and 0.45 g of food coloring to the attapulgite suspension in turn, stir for 10 minutes, pour 9 g of polyvinyl alcohol aqueous solution with a mass concentration of 20%, and then Stir at a high speed for 10 minutes to obtain a slurry for preparing attapulgite-based colored chalk; inject the slurry into a mold, dry it at 50° C., and demould to obtain a finished chalk.

Embodiment 2

[0016] Embodiment 2: prepare dust-free colored chalk according to the following method:

[0017] Weigh 4.55 g of sodium polyacrylate and dissolve it in 1300 ml of water. Under stirring, slowly add attapulgite powder with a weight of 700 g with a purity greater than 80% and a 200-mesh sieve into the aqueous solution of sodium polyacrylate, and Continue stirring for 4 hours at room temperature to obtain attapulgite suspension; add 300 g of plaster of paris powder and 2.275 g of food coloring into the attapulgite suspension in turn, stir for 20 minutes, pour 31.5 g of polyvinyl alcohol aqueous solution with a mass concentration of 20%, Stir at a high speed for 10 minutes to obtain a slurry for preparing attapulgite-based colored chalk; inject the slurry into a mold, harden it in a natural state, and demold it to obtain a finished chalk.

Embodiment 3

[0018] Embodiment 3: prepare dust-free colored chalk according to the following method:

[0019] Weigh 4.0 g of sodium polyacrylate and dissolve it in 1100 ml of water. Under stirring, slowly add attapulgite powder with a purity of 500 g over 200 mesh sieve to the aqueous solution of sodium polyacrylate, and Stir continuously at room temperature for 6 hours to obtain attapulgite suspension; add 500 g of plaster of paris powder and 2.5 g of food coloring to the attapulgite suspension in turn, stir for 10 minutes, pour 30 g of polyvinyl alcohol aqueous solution with a mass concentration of 20%, and Stir for 10 minutes to obtain a slurry for preparing attapulgite-based colored chalk; inject the slurry into a mold, dry it at 35° C., and demould to obtain a finished chalk.

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Abstract

The invention discloses a preparation method of attapulgite-based dustless color chalks. The method comprises the following steps of: screening attapulgite to ensure that the purity is more than 80%, ball-milling the attapulgite and passing through a 200-mesh sieve to obtain attapulgite powder; weighing a specified volume of sodium polyacrylate and preparing the sodium polyacrylate to an aqueous solution, slowly adding the attapulgite powder into the sodium polyacrylate aqueous solution while stirring, and continuously stirring the solution to obtain uniformly dispersed attapulgite suspension; sequentially adding gypsum powder, colourant and a polyvinyl alcohol aqueous solution into the attapulgite suspension while stirring and stirring the solution with a high speed to obtain the slurry for preparing the attapulgite-based color chalks; and injection-molding the slurry, drying at 20-50 DEG C or naturally hardening and demoulding to obtain the finished product chalks. In the invention,the dustless chalks are prepared by replacing part of the gypsum powder with the attapulgite powder, which effectively improves the porosity and grain distribution of the chalks and increases the blending resistance performance and the skid resistance performance of the chalks, so that the chalks can be used for writing fluently and clearly.

Description

technical field [0001] The invention belongs to the technical field of utilization of non-metallic mineral resource attapulgite clay (hereinafter referred to as attapulgite), and in particular relates to a preparation method of attapulgite-based dust-free colored chalk. technical background [0002] Chalk is a writing instrument with many years of history. It is easy to use, cheap and widely used. Ordinary dusty chalk, in the process of writing and wiping, dust particles fly, seriously damaging the health of teachers and students. Dust-free chalk is currently the most widely used teaching writing tool. The composition of dust-free colored chalk mainly contains components such as plaster powder, binder, pigment or pigment, and in recent years there are also reports of using natural raw materials such as starch, Guanyin soil, shell powder to replace or partially replace plaster powder to prepare dust-free chalk. Contents of the invention [0003] The object of the present ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D13/00B43K19/00
Inventor 谷亚昕孙永明冯良东李登好
Owner HUAIYIN INSTITUTE OF TECHNOLOGY