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High-strength easily-erased resin pencil lead and preparation method thereof

A pencil lead and high-strength technology, which is applied in the field of polymer material modification preparation and processing, can solve the problems of unfavorable coloring of pencil lead, difficulty in erasing, broken lead core, etc., and achieves improved bending strength, improved coloring performance, energy consumption reduction effect

Active Publication Date: 2019-09-13
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Patent 200980127737.7: Pencil lead for writing, drawing and / or drawing devices and its preparation method uses polystyrene as resin binder to prepare pencil lead. Due to its superior coloring performance, polystyrene can meet the needs of pencil lead in writing When the coloring concentration is high, but it brings the problem that it is not easy to erase after writing. At the same time, due to the strong brittleness of polystyrene, the lead core is prone to core breakage during coiling.
[0004] Patent 201580073057.7: Polyolefin is used as resin binder in the refill of paper pencil, and the method of coating graphite with alkane wax realizes the preparation of easy-to-erasable pencil lead. The low-strength, high-toughness polyolefin binder can make The pencil lead is not easy to break, but it is easy to cause the pencil to break when writing. At the same time, the combination of polyolefin and alkane wax is very unfavorable to the coloring of the pencil lead

Method used

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  • High-strength easily-erased resin pencil lead and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0038] In terms of parts by mass, the composition of the resin pencil lead is: 31.5 parts of nanoparticle-reinforced polypropylene, 60 parts of graphite, 3.5 parts of calcium stearate, 3 parts of zinc stearate, 1 part of glyceryl stearate, and 1 part of titanic acid Ester coupling agent.

[0039] Among them, in terms of parts by mass, the composition of nanoparticle-reinforced polypropylene is: 94 parts of polypropylene, 4.5 parts of nano silicon dioxide, 0.7 parts of stearic acid, 0.5 parts of ethylene bis stearic acid amide, 0.2 parts of antioxidant 1010 , 0.1 part of antioxidant 168.

[0040] Its preparation method comprises the following steps:

[0041] 1) According to the above-mentioned parts by mass, polypropylene, nano silicon dioxide, antioxidant, and dispersant are mixed evenly, extruded and granulated by a parallel twin-screw extruder, and prepared into nanoparticle-reinforced polypropylene resin particles; The above extrusion temperature is 175-185°C;

[0042] 2...

Embodiment 2

[0046] According to the number of parts by mass, the composition of the resin pencil lead is: 29 parts of nano-particle reinforced resin, 58 parts of graphite, 2 parts of polyethylene wax, 1 part of stearic acid, 5 parts of calcium stearate, 3 parts of glyceryl stearate, 2 parts maleic anhydride grafted polypropylene;

[0047] Among them, in terms of parts by mass, the nanoparticle-reinforced resin components are: 73 parts of polypropylene, 20 parts of ABS resin, 6 parts of nano-montmorillonite, 0.4 parts of stearic acid, 0.4 parts of ethylene bisstearic acid amide, 0.3 parts Antioxidant 1076, 0.1 part of antioxidant 168.

[0048] Its preparation method comprises the following steps:

[0049] 1) Mix polypropylene, ABS resin, nano-montmorillonite, antioxidant, and dispersant uniformly according to the above-mentioned parts by mass, extrude and granulate with a parallel twin-screw extruder, and prepare nanoparticle-reinforced resin particles ;The extrusion temperature above is 1...

Embodiment 3

[0054] According to the number of parts by mass, the composition of the resin pencil core is: 38 parts of nano-particle reinforced polyethylene, 52 parts of graphite, 3 parts of magnesium stearate, 3 parts of zinc stearate, 2 parts of pentaerythritol stearate, 2 parts of silane joint agent;

[0055] Among them, in terms of parts by mass, the nanoparticle-reinforced polyethylene components are: 92 parts of polyethylene, 7 parts of nano-carbon black, 0.6 parts of calcium stearate, 0.2 parts of ethylene bis stearic acid amide, 0.1 part of antioxidant 1010 , 0.1 part of antioxidant 618.

[0056] Its preparation method comprises the following steps:

[0057] 1) According to the above-mentioned parts by mass, polyethylene, nano-carbon black, antioxidant, and dispersant are uniformly mixed, extruded and granulated by a parallel twin-screw extruder, and prepared into nanoparticle-reinforced polyethylene resin particles; the above-mentioned Extrusion temperature 160-170°C;

[0058] ...

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Abstract

The invention relates to a high-strength easily-erased resin pencil lead and a preparation method thereof. The preparation method comprises the following steps: uniformly mixing, by mass, 92-99 partsof thermoplastic resin, 1-8 parts of inorganic nanoparticles and 0.5-2.5 parts of a processing aid in a mixer, and extruding and granulating the obtained mixture by a parallel twin-screw extruder to prepare reinforced thermoplastic resin particles; and uniformly mixing 15-50 parts of the reinforced thermoplastic resin particles, 40-80 parts of graphite, 5-18 parts of a lubricant and 1-5 parts of asurfactant, drying and dehydrating the obtained mixture, kneading and mixing the dried mixture by an internal mixer, granulating the kneaded mixture in a single-screw extruder, molding obtained granules by an extrusion molding machine, and cutting the molded granules to prepare the pencil lead with a suitable length. The resin pencil lead prepared in the invention has the advantages of high strength, easiness in being erased, good slippery and good coloring property, and the preparation method has the advantages of simple process, low cost, and realization of continuous large-scale production. The pencil lead can be widely used in pencils for writing, drawing and painting.

Description

technical field [0001] The invention belongs to the field of modified preparation and processing of polymer materials, and more specifically relates to a method for preparing a high-strength and easy-to-erasable resin pencil lead. Background technique [0002] Compared with the traditional graphite pencil lead, the resin pencil lead has superior properties such as low abrasion during writing, not easy to break, and not easy to dirty hands. At the same time, the preparation process of the resin pencil lead is simple, the production efficiency is high, and the production energy consumption is low. Therefore, developing a resin pencil lead with excellent properties has become one of the technical development trends in the pencil industry. [0003] Patent 200980127737.7: Pencil lead for writing, drawing and / or drawing devices and its preparation method uses polystyrene as resin binder to prepare pencil lead. Due to its superior coloring performance, polystyrene can meet the need...

Claims

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Application Information

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IPC IPC(8): C09D13/00
CPCC09D13/00
Inventor 付正广王大伟陈骁王光
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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