Resin fine lead core is a special lead core for fine lead movable pencil, which has high flexural strength and good writing performance. It mainly uses synthetic resin as the binder of lead containing core, such as polyvinyl alcohol, asphalt, furan resin, polyvinyl chloride, ABC resin, vinyl chloride vinyl acetate copolymer, etc.; the colorant with graphite as the lead core; the commonly used solvents are water and ethanol; the plasticizers are dioctyl phthalate and Trimethylphenol phosphate to reduce the flow viscosity of the resin at high temperature, To improve the molding performance, lead stearate is often used as stabilizer to prevent resin aging and inhibit oxidation process; liquid paraffin and low molecular weight polyethylene are used as lubricants to improve the flow performance of resin melt.

 

Resin fine lead core is made by calcining and carbonizing at high temperature under the protection of inert gas (such as argon) or sealing conditions to form graphitized structure, which has high mechanical strength and good writing performance.