High-temperature-resistant colored pencil core and preparation method thereof

Abstract

The invention discloses a high-temperature-resistant colored pencil core which comprises the following components in parts by weight: 40-70 parts of clay, 5-15 parts of constitution raw material, 5-20 parts of pigment powder, 1-12 parts of wax, 1-10 parts of grease, 1-8 parts of adhesive and 10-40 parts of water. The invention also discloses a preparation method of the high-temperature-resistant colored pencil core. The modified cellulose and modified synthetic wax are adopted to increase the high temperature resistance of the mixture and enhance the temperature of the drying oven, thereby shortening the lead drying time to less than 12 hours, greatly shortening the time of the whole technique and enhancing the production efficiency. The vacuum core extrusion technique is adopted to enhance the density of the lead core, thereby enhancing the flexural strength of the lead core, the core tip stress of the penpoint, lowering the breaking rate of in the sharpening process and improving the wear resistance of the pencil; and the appearance of the lead core is more smooth, and the quality of the product is upgraded.

Description

technical field [0001] The invention relates to a pencil lead and a preparation method thereof, in particular to a high-temperature-resistant colored pencil lead and a preparation method thereof. Background technique [0002] Colored pencil refills are pencil refills that use colorants as colorants. [0003] Colored lead cores mainly use clay as a binder, adding colorants, pigments, body materials, water, adhesives, oils and waxes, etc., and are mixed and ground into flakes, stirred, extruded, and dried. Known as a clay color core. [0004] The adhesives used in traditional colored pencil refills are generally tragacanth gum, acacia gum, peach gum, cellulose, water-soluble dextrin powder, etc., and a large amount of oil and wax are added, so in the subsequent drying process At the same time, the temperature cannot be set too high, it can only be controlled between 40°C-45°C, and it needs to be baked for 3-4 days to dry the moisture in the color pen core to the requirements...

AI Technical Summary

Problems solved by technology

[0005] The traditional extrusion molding generally uses cylindrical extrusion and screw extrusion to extrude the pencil lead. Since the core is extruded in a completely open environment and directly contacts the air, the air will inevitably enter the pencil lead. A lot of air bubbles are formed, so that the density of the pencil lead is not high, which will affect the flexural strength of the pencil lead, the force of the core tip, the breakage rate of the pencil lead and the appearance, and the degree of automation is not high. Manual core rubbing, a hydraulic core extrusion machine requires at least 2 people to operate, one for filling and one for core rubbing, which increases the number of operators