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Colored pencil lead with high flexural strength and preparation method thereof

A technology of flexural strength and pencil lead, which is applied in the field of colored pencil lead and its preparation, can solve the problems of weak coloring degree, low writing lubricity, low flexural strength of colored resin thin pencil lead, etc., and achieve uniformity of products, Easy operation and tight rod effect

Pending Publication Date: 2022-04-15
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the above-mentioned shortcoming of prior art, the object of the present invention is to provide a kind of colored pencil lead with high flexural strength and its preparation method, solve the problem of low flexural strength of colored resin thin pencil lead, low writing lubricity and coloring degree not strong problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0047] The method for preparing the above-mentioned colored pencil lead with high flexural strength provided by the invention is as follows:

[0048] (1) In a reaction kettle with a temperature of 90°C-100°C and a mechanical stirring speed of 100-1000r / min, in terms of parts by mass, 25-30 parts of nitrocellulose are mixed with 0.5-5 times the total mass The solvent is dissolved until the dissolution is complete;

[0049] Wherein, the solvent is one or more compounded solvents of acetone, butanone, toluene or ethyl acetate.

[0050] (2) In terms of parts by mass, weigh 25-30 parts of whiskers, 5-10 parts of wax, 15-20 parts of lubricant and 13-17 parts of toner and mix them evenly. After adding to the reaction kettle of step (1), Then add 1-3 parts of dispersant and continue the mechanical stirring reaction for 30min-60min to obtain a uniformly stirred mixture.

[0051] (3) In terms of parts by mass, add 1-3 parts of plasticizer to the uniformly stirred mixture in step (2), ...

Embodiment 1

[0059] A red pencil lead with high flexural strength was prepared as follows:

[0060] (1) In a reactor with a temperature of 90°C and a mechanical stirring speed of 1000r / min, 25 parts by mass of nitrocellulose with a molecular weight of 150,000 and a nitrogen content of 8% was used for 0.5 times its total mass Toluene and acetone (1:1) were dissolved in the reactor until the dissolution was complete.

[0061] (2) In terms of parts by mass, weigh 25 parts of magnesium carbonate trihydrate whiskers (about 5 microns in diameter and about 50 microns in length), 5 parts of polyethylene wax (molecular weight 1500), 5 parts of erucamide, 17 1 part of calcium stearate, 1 part of talcum powder and 15 parts of red toner are mixed evenly and added to the reaction kettle of step (1), then 1 part of oleic acid diethanolamide is added to continue the mechanical stirring reaction for 30 minutes to obtain a uniformly stirred mixture .

[0062] (3) In terms of parts by mass, add 1 part of ...

Embodiment 2

[0069] A red pencil lead with high flexural strength was prepared as follows:

[0070] (1) In a reaction kettle with a temperature of 100°C and a mechanical stirring speed of 1000r / min, 25 parts by mass of nitrocellulose with a molecular weight of 200000 and a nitrogen content of 10% was used to double its total mass Toluene and butanone (1:1) were dissolved in the reactor until the dissolution was complete.

[0071] (2) In terms of parts by mass, weigh 29 parts of anhydrous magnesium sulfate whiskers (about 3 microns in diameter and about 90 microns in length), 3 parts of polyethylene wax (molecular weight 2000), 3 parts of erucamide, 16 parts After 1 part of calcium stearate, 2 parts of talcum powder and 13 parts of red toner were mixed evenly and added to the reaction kettle of step (1), 3 parts of oleic acid diethanolamide were added to continue the mechanical stirring reaction for 45 minutes to obtain a well-stirred mixture .

[0072] (3) In terms of parts by mass, add ...

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Abstract

The invention discloses a colored pencil lead with high flexural strength and a preparation method thereof, and belongs to the technical field of pencil lead manufacturing. The preparation method comprises the following steps: dissolving and stirring 25-30 parts by mass of cellulose nitrate in a reaction kettle by using a solvent, adding 25-30 parts by mass of whiskers, 15-20 parts by mass of a lubricant, 5-10 parts by mass of wax and 13-17 parts by mass of toner, uniformly stirring, immediately adding 1-3 parts by mass of a dispersant, stirring for a period of time, adding 1-3 parts by mass of a plasticizer, continuously stirring, removing most of the solvent, and carrying out roller milling, rod beating, core extrusion, straightening, drying and end cutting to obtain a finished product. And the colored pencil lead with excellent performance is obtained. The colored pencil lead prepared by the method has the characteristics of high flexural strength, good coloring degree, high writing lubricity and the like, and multi-specification large-scale production can be realized without purchasing new equipment in the preparation process.

Description

technical field [0001] The invention belongs to the technical field of pencil lead manufacturing, and relates to a colored pencil lead with high flexural strength and a preparation method thereof, in particular to a colored pencil lead with high flexural strength, high writing lubricity and high coloring degree and its preparation method. Background technique [0002] Colored pencil lead often attracts attention as a necessary tool for students and illustrators to work and study. Ordinary colored pencil cores often use clay as a binder, together with physical raw materials, toner, grease, solvents and waxes. When used above 2.0mm, the flexural strength and lubricity can adapt to the use environment. However, the colored thin lead (0.5mm-1.0mm) used in fine painting is often easily broken by the production method of ordinary pencil lead, and the flexural strength cannot reach the usable standard. [0003] Nowadays, the common method of enhancing colored fine pencil lead is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D13/00
Inventor 刘超袁启明史炳瑞李茜张佳豪薛新
Owner SHAANXI UNIV OF SCI & TECH
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