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Colored pencil lead and preparation method thereof

A pencil lead and color technology, applied in pencil lead, household utensils, application and other directions, can solve the problems of complex raw materials and process for color pencil lead production, handwriting cannot be automatically faded, raw material environment is polluted, etc., to improve hardness and coverage. , smooth writing, no slag effect

Inactive Publication Date: 2013-05-01
浙江奥乐奥新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the prior art, the common pencil lead used for writing, drawing and painting is basically composed of clay and graphite powder, which has disadvantages such as incomplete erasing, unhygienic, and difficult to clean when it gets on hands, which is harmful to the health of users. Unfavorable; the raw materials and processes of the existing colored pencil cores are complex, such as patent CN1302316A, the raw materials pollute the environment, and the written handwriting cannot automatically fade, so it is not suitable for occasions that do not require long-term preservation such as temporary marks and calligraphy and painting exercises.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] Embodiment 1: prepare red pencil lead

[0009] Components: sodium thiosulfate 7g, sodium carbonate 0.565g, phenolphthalein 1.186g, carboxymethylcellulose sodium 1g.

[0010] Preparation method: mix phenolphthalein and sodium carbonate, add absolute ethanol dropwise to adjust to a thick paste, then pour molten sodium thiosulfate into it and stir evenly, then add sodium carboxymethylcellulose and stir evenly, pour into the mold Medium, dry, take out, and that's it.

[0011] Effect: Using the Wolff-wilborn pencil hardness test method, the hardness of the pencil core is 5H, with high chroma and good coverage. Withstand temperature 45℃.

Embodiment 2

[0012] Embodiment 2: prepare red pencil lead

[0013] Components: sodium thiosulfate 7g, sodium carbonate 0.421g, phenolphthalein 0.883g, carboxymethylcellulose sodium 0.9g, kaolin 0.8g.

[0014] Preparation method: mix phenolphthalein and sodium carbonate, add absolute ethanol dropwise to adjust to a thick paste, then pour molten sodium thiosulfate into it and stir evenly, then add sodium carboxymethylcellulose and kaolin and stir evenly, pour Put it in the mold, let it dry, take it out, and it's ready.

[0015] Effect: Using the Wolff-wilborn pencil hardness test method, the hardness of the pencil core is 4H, the chroma is very high, and the coverage is very good. Withstand temperature 45℃.

Embodiment 3

[0016] Embodiment 3: prepare yellow pencil lead

[0017] Components: sodium thiosulfate 7g, sodium carbonate 0.812g, m-nitrophenol 1.077g, carboxymethylcellulose sodium 1.5g.

[0018] Preparation method: mix m-nitrophenol and sodium carbonate, add absolute ethanol dropwise to adjust to a thick paste, then pour molten sodium thiosulfate into it and stir evenly, then add sodium carboxymethylcellulose and stir evenly, Pour into molds, let dry, remove, and serve.

[0019] Effect: Using the Wolff-wilborn pencil hardness test method, the hardness of the pencil core is 3H, with high chroma and good coverage. Withstand temperature 45℃.

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Abstract

The invention provides a colored pencil lead and a preparation method thereof. The colored pencil lead comprises components in parts by mass as follows: 62-73 parts of sodium thiosulfate, 13-20 parts of a color developing agent, 7-15 parts of CMC (carboxy methylated cellulose) and 0-8 parts of kaolin, wherein the color developing agent consists of sodium carbonate and an acid-base indicator. The preparation method of the colored pencil lead includes steps of weighing the raw materials in proportion, mixing sodium carbonate and the acid-base indicator, adding absolute ethyl alcohol dropwise and mixing to a heavy paste, then pouring molten sodium thiosulfate in and stirring evenly, adding CMC and kaolin, stirring evenly, pouring into a die, drying, and taking out. The provided colored pencil lead can fade both when the lead meets water and when the lead is placed in the air for a long time, is easy to wash when adhering to hands or clothes, is non-residual, non-toxic and harmless, and is suitable for occasions where long-stem storage is not needed, such as temporary marking, calligraphy and painting exercise, and the like.

Description

technical field [0001] The invention relates to a writing material, in particular to a colored pencil lead suitable for occasions such as temporary marking, calligraphy and painting practice, etc. that do not require long-term storage and a preparation method thereof. Background technique [0002] In the prior art, the common pencil lead used for writing, drawing and painting is basically composed of clay and graphite powder, which has disadvantages such as incomplete erasing, unhygienic, and difficult to clean when it gets on hands, which is harmful to the health of users. Unfavorable; The raw material and process complexity of existing colored pencil lead are as patent CN1302316A, and raw material pollutes environment, and the handwriting of writing can not fade automatically, is not suitable for the occasion that does not need long-term preservation such as temporary marking, calligraphy and painting practice. Contents of the invention [0003] The object of the present...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D13/00
Inventor 董川游志校翟晓倩苏丽霞于洋张建刚王晓丽李丽霞周叶红
Owner 浙江奥乐奥新材料科技有限公司
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