Free-cutting soft plastic pencil holder formulation

Abstract

The invention provides a formula for a soft plastic pencil shaft, the formula is (by weight): 45-60% of polyvinyl chloride, 38-50% of calcium carbonate, 1.0-2.2% of dibutyl ester, 0.80-2.2% of dioctyl ester %, foaming agent 0.20-0.30%, the foaming agent in the plastic pen holder is an azo compound. The soft lead plastic pen holder made by the invention has very good toughness, will not break when bent, is easy to curl, and can have many changes in the shape of the pen holder. Due to the addition of foaming agent, the production efficiency of the soft plastic pencil shaft is greatly improved, which is also conducive to the stability of product quality.

Description

technical field [0001] The invention relates to a pencil, in particular to an improvement to the formula of the existing soft plastic pen holder. Background technique [0002] General pencils are made of wood, which is made of strip-shaped lead embedded in a wooden pen holder. When making it, many cutting processes are required to make the log into a round, regular hexagonal or regular octagonal pen holder. The process is quite cumbersome, the production cost is high, and a lot of high-quality wood is wasted, which is not conducive to the environmental requirements. In order to overcome the above-mentioned shortcomings of wooden pencils, soft plastic pencils are now also available. For example, someone has applied for a patent called "A Manufacturing Method for Plastic Pencils" (94110665.9), the purpose of which is to solve the waste of wood and realize the replacement of wood with plastic. To produce plastic pencils, the formula includes polyethylene 10-60, polypropylene ...

AI Technical Summary

Problems solved by technology

[0003] The present invention mainly solves the technical problems of poor toughness and difficult cutting of the plastic pencil barrel existing in the prior art.