Plastic pencil and preparation method thereof

Abstract

The present invention relates to a plastic pencil, which comprises a pencil rod, a pencil core and a pencil skin, wherein the components of the pencil rod comprise 30-50 wt% of polystyrene (PS), 10-30 wt% of a synthetic rubber, 2-8 wt% of a nucleating agent, 30-50 wt% of talc powder, and 5-10 wt% of calcium stearate, and are added with polyethylene (PE), the components of the pencil core comprise 20-50 wt% of polystyrene (PS), 2-10 wt% of an organosilicon polymer, 30-60 wt% of graphite powder, 2-10 wt% of hydrogenated palm oil, 2-10 wt% of oleic acid amide, and 5-10 wt% of a synthetic rubber, and the components of the pencil skin comprise 70-90 wt% of polystyrene (PS), 5-20 wt% of color master batch, and 2-10 wt% of hydrogenated palm oil. According to the present invention, the pencil rod and the pencil core are not easily broken, the pencil core has characteristics of good striking degree, good brightness and dreg falling resistance, and the manufacturing cost is low.

Description

technical field [0001] The invention relates to a pencil and a preparation method thereof, in particular to a plastic pencil and a preparation method thereof. Background technique [0002] Pencil is a kind of cultural school supplies commonly used by people. According to reports, my country provides 6 to 7 billion pencils to the world market every year, and is the world's largest exporter of pencils. Wooden pencils are the main type of pencil exports, and the export volume consumes more than 200,000 cubic meters of wood annually. . my country's per capita forest tree share is far lower than the world's average level, ranking 107th in the world. The wood used in wooden pencils is mainly basswood, while my country's basswood species are relatively scarce, and the growth cycle of high-quality basswood is as long as 60 to 70 years. . Therefore, although the export of wooden pencils has been exchanged for foreign exchange, it is at the cost of a large amount of high-quality timb...

AI Technical Summary

Problems solved by technology

[0003] Pencil is the "first touch" that people come into contact with. Most of the kindergarten and primary school students are using pencils. Due to their young age, students in this age group often slip off accidentally during use. Most of the existing pencils use Wooden pen holders and graphite refills, if the pencil slips, it is easy to break the pen holder or refill, and the graphite refill is easy to drop slag, which affects children's health; The sharpness and vividness of the core are poor; in order to make wooden pencils more beautiful, various patterns are usually painted on the surface of the pen barrel, and the paint contains a lot of toxic substances, especially children will have the bad habit of biting pens. The impact on children's health is particularly pronounced

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