Pencil lead, wood substitute, pencil and preparation method thereof

Abstract

The invention discloses a pencil lead, a wood substitute, a pencil and a preparation method thereof. The pencil lead comprises at least one first polymer which comprises one or more of a copolymer of lower olefin and higher olefin, a styrene block copolymer, an ethylene and unsaturated carboxylic acid copolymer, an ethylene and unsaturated carboxylic ester copolymer and an ethylene and saturated carboxylic acid vinyl ester copolymer; and a functional monomer graft which comprises one or more of unsaturated carboxylic acid, unsaturated dianhydride, unsaturated carboxylic acid alkyl ester and unsaturated carboxylic acid glycidyl ester.

Description

technical field [0001] The invention belongs to the technical field of polymer material modification preparation and processing, and in particular relates to a pen core, a wood substitute, a pencil and a preparation method thereof. Background technique [0002] The statements herein merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] Traditional wooden pencils mainly use high-quality natural wood as the main raw material. With the reduction of forest resources and the limitation of felling, the price of wood used in pencils has increased significantly, which directly affects the production cost of pencils. Therefore, begin to try to replace natural wood with wood substitute, realize the reduction of pencil production cost and the green environmental protection of product. [0004] Based on this, some scholars have proposed a pencil that uses foamed polymer as a wood substitute and a polymer-bonded refi...

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Problems solved by technology

However, in pencils co-extruded with such wood substitutes and pen cores, the appropriate polymer is generally selected according to the preset pencil performance, so it often occurs that the polymers used in the pen core and wood substitutes are less compatible. bad question

When the compatibility of the polymer used in the pen core and the wood substitute is poor, the pen core cannot be bonded and protected by the wood substitute sufficiently, and the pencil lead slips and the pen core often breaks when writing. In order to solve the above problem, some scholars set up a layer of adhesion-promoting layer between the pencil lead and the wood substitute material. Although the above problems are well solved, the disadvantage is that the increase of the adhesion-promoting layer will increase the material cost and equipment of the pencil at the same time. investment and reduce production efficiency

[0006]Also, as far as the wood substitute itself is concerned, although it can provide sufficient strength, due to the high hardness of the material, it needs to be sharpened more than natural pencils. wood sharpening torque

As far as the refill itself is concerned, coloring is contradictory to erasability and toughness. Easy-to-color polymers are not easy to erase and are brittle. The current refill materials cannot achieve both coloring, erasure and toughness. Pigment dispersion in polymer and low interfacial bond strength

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