CN1041214C - Formula and process of wet dust-free chalk - Google Patents

Formula and process of wet dust-free chalk Download PDF

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Publication number
CN1041214C
CN1041214C CN 93104131 CN93104131A CN1041214C CN 1041214 C CN1041214 C CN 1041214C CN 93104131 CN93104131 CN 93104131 CN 93104131 A CN93104131 A CN 93104131A CN 1041214 C CN1041214 C CN 1041214C
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China
Prior art keywords
chalk
dust
writing
formula
water
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Expired - Fee Related
Application number
CN 93104131
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Chinese (zh)
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CN1077472A (en
Inventor
谢子育
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Individual
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Individual
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Publication date
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Priority to CN 93104131 priority Critical patent/CN1041214C/en
Publication of CN1077472A publication Critical patent/CN1077472A/en
Application granted granted Critical
Publication of CN1041214C publication Critical patent/CN1041214C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

The invention relates to a formula and a process of wet dust-free chalk. It is made up by using gypsum powder, talcum powder, sodium alginate, amine chloride, glycerine and water through the processes of mixing and casting. The chalk keeps the humidity permanently, the writing and wiping do not have dust flying, do not change the paste, write smoothly, do not skid, the writing is clear, not sticky, the material used is nonhazardous, there is no waste water waste liquid treatment problem. Thoroughly solves the pollution of dust flying of common chalk and tiny dust chalk to the teaching environment. In addition, the invention has the advantages of fast curing and hardening, easy moisture removal and reduced drying cost.

Description

The prescription of moist dust-free chalk and technology
The present invention relates to the prescription and the production technique of a kind of chalk, particularly a kind of moist dust-free chalk.
Common chalk is to be formed by the semi-hydrated gypsum chill casting, or is formed by the extruding of Cornstarch interpolation tackiness agent.Gypsum chalk contains pore, and easily, proportion is less, the writing sharpness height of writing, but dust from flying is very big.The Cornstarch pen is more closely knit, and proportion is bigger, but the varying in size of suffered frictional force during because of writing on the blackboard, blackboard wiping, and dust granules varies in size, and little still flying dust is all over the sky.In recent years, people have done many effort and exploration to the research of chalk, have also obtained certain effect.For example Chinese patent discloses a kind of " prescription of novel micronic dust chalk and technology " (application number has been: 86103372), it is to be raw material with semi-hydrated gypsum powder, Cornstarch, water, make by certain proportioning, the all more aforementioned two kinds of chalks of effect are for well, but the problem of chalk dust, skidding are also not basic to solve.
The objective of the invention is to avoid above-mentioned weak point of the prior art and a kind of moist dust-free chalk is provided, this chalk is permanent to keep moist, during use, and no dust from flying, non-slip, writing sharpness height, toxicological harmless effect.
The present invention is mixed by gesso, talcum powder, sodium alginate (or sea moss), ammonia chloride, G ﹠ W to form through casting.Its prescription (by weight percentage) is:
Gesso 30~60%, talcum powder 1.28~3.47%, ammonium chloride 0.0001~2%, glycerine 0.75~4.29%, and sodium alginate 0.0001~1%, sea moss 0.0001~1% are wherein a kind of, surplus is a water.
The effect of above-mentioned each component is: talcum powder is a lubricant, and glycerine is wetting Agent for Printing Inks, and sodium alginate, sea moss and ammonia chloride then are hardness and the toughness that strengthens chalk.
Through the chalk of cast molding, can natural air drying, or carry out drying by heating, bake out temperature mustn't be greater than 55 ℃.
The present invention has following advantage compared to existing technology: 1, write soft and smooth, fluent, non-slip, writing is pure white, clear, easy wiping.2, chalk and the powder write out are lasting keeps moist, and the wiping powder does not have and flies upward, and constant paste.3, toxicological harmless effect, health, tack-free, sticking clothes, and the releasing of imperial end uses the dryness chalk to cause the misery that finger skin is cracked from dryness.4, the hardening of shaping and demoulding after fixing is fast, removes moisture content easily, reduces baking, shines cost.
Embodiment:
Raw material weight %
Gesso 46.91
Talcum powder 2.47
Sodium alginate 0.0025
Ammonia chloride 0.0025
Glycerine 1.23
Water 49.385
Take by weighing gesso and talcum powder by formula rate, mixing is stand-by; Taking by weighing 30~40 ℃ of warm water by formula rate places in the stirred vessel stand-by; Take by weighing ammonia chloride by formula rate, and get the water that is five times in ammonia chloride place in the container from the proportioning water that has weighed up, pouring ammonia chloride into, to stir evenly into thin liquid stand-by; Take by weighing glycerine by formula rate, get the water that is three times in glycerine again from the proportioning water that has weighed up and place in another container, pouring glycerine into, to stir into thin liquid stand-by.Then in stirred vessel, on one side stir water, Yi Bian slowly pour sodium alginate into, make it become uniform viscous liquid after, pouring the ammonia chloride thin liquid into stirs, pour gesso and talcous powder mix again into, treat that nature soaks after, along after a direction stirs into finely starched, pouring the glycerine thin liquid under constantly stirring stirs, speed extremely stirs retrogradation gradually, i.e. moulded by casting slowly by fast then.Through cool, shine or be not higher than 55 ℃ of oven dry finished product packings.

Claims (2)

1, a kind of moist dust-free chalk is characterized in that by gesso 30~60% talcum powder 1.28~3.47%, ammonia chloride 0.0001~2%, glycerine 0.75~4.29%, and sodium alginate 0.0001~1%, sea moss 0.0001~1% are wherein a kind of, surplus is that water is formed.
2, moist dust-free chalk according to claim 1, it is characterized in that cast molding after, bake out temperature must not be greater than 55 ℃.
CN 93104131 1993-04-01 1993-04-01 Formula and process of wet dust-free chalk Expired - Fee Related CN1041214C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 93104131 CN1041214C (en) 1993-04-01 1993-04-01 Formula and process of wet dust-free chalk

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 93104131 CN1041214C (en) 1993-04-01 1993-04-01 Formula and process of wet dust-free chalk

Publications (2)

Publication Number Publication Date
CN1077472A CN1077472A (en) 1993-10-20
CN1041214C true CN1041214C (en) 1998-12-16

Family

ID=4985016

Family Applications (1)

Application Number Title Priority Date Filing Date
CN 93104131 Expired - Fee Related CN1041214C (en) 1993-04-01 1993-04-01 Formula and process of wet dust-free chalk

Country Status (1)

Country Link
CN (1) CN1041214C (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108659626A (en) * 2018-07-11 2018-10-16 欧光君 A kind of water-soluble chalk and its manufacturing method

Also Published As

Publication number Publication date
CN1077472A (en) 1993-10-20

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