Modified plastic particle for graphite pencil lead of plastic pencil

Abstract

The invention discloses a modified plastic particle for a graphite pencil lead of a plastic pencil. A preparation method is as follows: 1) performing micro-foaming treatment on a polymer plastic particle to obtain a micro-foamed polymer plastic particle; 2) adding a cellulose aqueous solution into a prepared alumina sol, and performing uniform stirring to obtain a composite sol solution; 3) dropwise adding ammonia water into the composite sol solution, performing mixing and stirring, and then adding the micro-foamed polymer plastic particle into the composite sol solution for vacuum impregnation treatment to obtain a composite gel/micro-foamed polymer composite plastic particle; and 4) performing solvent replacement and freeze-drying on the obtained composite plastic particle. The modifiedplastic particle prepared by the invention can be widely used in a formula of a graphite pencil lead of plastic pencils, can effectively solve the problems of easy breakage and slag dropping of the pencil lead, can also improve the writing comfort of pencils, and has good market application prospects.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a modified plastic particle used for a graphite lead of a plastic pencil. Background technique [0002] Pencil is a kind of cultural school supplies commonly used by people, and is mainly used in aspects such as writing and painting, and its main structure is to be embedded in the penholder by strip pen core and form. Generally, the pen holder of a pencil is usually made of wood. When making it, it is usually necessary to make the log into a pen holder in the shape of a circle, a regular hexagon, or a regular octagon. high, and consume a large amount of high-quality wood, which seriously damages the ecological environment. In addition, in order to produce pen holders of different colors, wooden pencils need to use paint to spray the outer surface, which will inevitably cause pollution of toxic and harmful substances, and it is undoubtedly a major disadvanta...

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Problems solved by technology

[0003] Existing plastic pencil cores are mostly prepared by kneading polymer plastics such as PP, PE, PS and graphite, additives and other materials. Although they meet the concept of environmental protection, they are much inferior in performance compared to wooden pencils. For example, the publication number is CN108864827A discloses a formula and preparation method of a plastic pencil refill. What adopts in the formula is conventional PP, PE polymer plastics. Although the problem of excessive hardness and insufficient rigidity of plastic pencils can be improved to a certain extent, the plastic pencil has been improved. The toughness of the pencil lead, but due to the use of conventional polymer plastics, the problems of plastic pencil leads that are easy to break, easy to drop residue, and poor writing comfort have not been better resolved

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