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A 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 stationery, can solve the problems of low flexural strength of colored pencil lead, high processing conditions and equipment requirements, and difficult erasure of writing marks, so as to improve erasability, Low cost, beautiful writing effect

Active Publication Date: 2021-03-16
烟台好前程文具有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing new technology still has the following problems: on the one hand, if the adhesive is a thermosetting resin, there will be problems of sticking to the roller mill or extruder during the processing, so the processing conditions and equipment are relatively high.
If the binder is a thermoplastic resin, the flexural strength of the colored pencil lead is not high, and the writing comfort is poor; on the other hand, because the composition contains wax substances, the writing marks are not easy to erase; in addition In addition, existing colored pencil refills on the market generally have problems such as not bright writing traces.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Adopt following process method to prepare a kind of high-performance red pencil lead:

[0041] a. In terms of parts by mass, take by weighing 25 parts of phenolic resin, 15 parts of polyethylene resin, 35 parts of talc, 20 parts of red pigment powder, 5 parts of nano silicon dioxide and 150 parts of butanone;

[0042]b. Mechanically blending the weighed raw material and methyl ethyl ketone at 80° C. to remove 80% of the total mass of methyl methyl ethyl ketone to obtain a mixture;

[0043] c. Roll the mixture through a roller mill at 100°C for 6 times to obtain a uniformly dispersed red film-like material;

[0044] d. Extrude the film-like material in the step c and cut it into 15cm rods in a rod making machine;

[0045] e. Extrude the rod in step d into a core at 130° C. with a single-screw extruder and cut it into 8 cm short cores;

[0046] f. Dry the short lead in an oven at 100°C for 2 hours to obtain a red pencil lead with high flexural strength;

[0047] g. Pla...

Embodiment 2

[0050] Adopt following process method to prepare a kind of high-performance yellow pencil lead:

[0051] a. In terms of parts by mass, weigh 35 parts of water-based polyurethane resin, 12 parts of polyvinyl alcohol resin, 30 parts of kaolin, 18 parts of yellow pigment powder, 5 parts of nano titanium dioxide and 200 parts of water;

[0052] b. Mechanically blending the weighed raw materials and water at 110°C to remove 85% of the water mass to obtain a mixture;

[0053] c. the mixture is rolled 6 times at 110° C. through a roll mill to obtain a uniformly dispersed yellow film-like material;

[0054] d. Extrude the film-like material in the step c and cut it into 15cm rods in a rod making machine;

[0055] e. Extrude the rod in step d into a core at 135° C. with a single-screw extruder and cut it into 20 cm short cores;

[0056] f. Dry the short lead in an oven at 100°C for 2 hours to obtain a yellow pencil lead with high flexural strength;

[0057] g. Place the yellow penci...

Embodiment 3

[0060] Adopt following process method to prepare a kind of high-performance green pencil lead:

[0061] a. In terms of parts by mass, weigh 35 parts of cyanate resin, 12 parts of rubber resin, 30 parts of diatomaceous earth, 18 parts of green pigment powder, 5 parts of nano zinc oxide and 100 parts of chloroform;

[0062] b. mechanically blending the weighed raw material and chloroform at 80° C. to remove 85% of the total mass of chloroform in chloroform to obtain a mixture;

[0063] c. The mixture is rolled 8 times at 110°C through a roll mill to obtain a uniformly dispersed green film-like material;

[0064] d. Extrude the film-like material in the step c and cut it into 15cm rods in a rod making machine;

[0065] e. Extrude the rod in step d into a core at 140°C with a single-screw extruder and cut it into 10cm short cores;

[0066] f. Dry the short lead in an oven at 120°C for 2 hours to obtain a colored pencil lead with high flexural strength;

[0067] g. Place the col...

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Abstract

The invention discloses a color pencil lead with high flexural strength and a preparation method thereof. The preparation method comprises blending 20-40 parts by mass of a thermosetting resin, 10-30parts by mass of a thermoplastic resin, 30-50 parts by mass of base raw materials, 10-20 parts by mass of pigment powder, 3-7 parts by mass of an enhancing filler and a solvent under heating, removinga part of the solvent, carrying out roller mixing at 100-120 DEG C until uniform dispersion, extruding the mixture through a bar extruding machine to obtain bars, extruding the bars to obtain pencilleads, and then cutting the pencil leads to obtain color pencil leads with high flexural strength. The preparation method can produce a color pencil lead with high flexural strength, high writing markscrubbability and bright color, has simple processes, realizes a low cost and has high efficiency. The method is suitable for direct large-scale production of color pencil leads with various specifications in the traditional large-scale production factory without new equipment.

Description

technical field [0001] The invention belongs to the technical field of stationery and sports articles, and relates to a preparation method of a colored pencil lead, in particular to a colored pencil lead with high flexural strength and a preparation method thereof. Background technique [0002] Colored pencil lead is a kind of pencil lead that uses colorant as a coloring agent, and is highly sought after by students and designers. There are two main methods for preparing colored pencil cores: one is the calcination method, which usually first prepares a composite material core with a polymer and an inorganic filler, and then prepares a porous white or light-colored core through high-temperature calcination. Finally, colored pencil leads are prepared by filling the voids with dye ink. Another non-calcination method usually uses non-blending wax to prepare a porous color core body, and then prepares a colored pencil lead by filling the core body with liquid oil or wax. Compa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D13/00B43K19/18
CPCB43K19/18C09D13/00
Inventor 刘超鲍艳刘锐李帅刘鹏辉
Owner 烟台好前程文具有限公司
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