The Research Of Carbon Based Anti-static Coatings For Corrugated Cardboard

In the dissertation, the generation of static and electrostatic hazards, the study and development of anti-static packaging were reviewed. On the base, the research of carbon based anti-static coatings were discussed, in order to probe into its engineering application fields and prospects for anti-static corrugated cardboard. At last, a method of anti-static packaging design was discussed.The results of the study for the solvent-based anti-static coating showed:the ratio and content of the fillers, solvent content, coupling agent content, temperature, humidity, coating thickness and viscosity were important in the functions. When the ratio of conductive graphite and carbon black is 4:1, the content of the fillers was 10%-50%, the surface resistivity of the coating can effectively adjust between10²â€”10¹⁰Ω/cm2. The content of solvent best controlled in 45%—60%, the coupling agent content is 0.4%-1.2%, the viscosity is 100-125mP.s, the thickness is about 100-120um. At this point, the coating has a suitable viscosity, excellent electrical conductivity properties and easy for preparation. As the surface resistivity of the coating changes with temperature and humidity, so during the anti-static packaging testing and applications, the effects of temperature and humidity should be concerned. The results of the study for the dispersion, adhesion and abrasion resistance of the coating showed:when the filler content increased, the abrasion resistance and adhesion showed the trend of deterioration, it was almost an inverse relationship. The coupling agent could improve the properties of the coating.Through orthogonal experimental design found that the order of the influencing factors of Water-based anti-static coating properties is:1)The content of conductive filler; 2)The amount of dispersing agent; 3)Solvent content; 4)Supporting film content. When the content of the fillers was 5%-45%, the surface resistivity of the coating can effectively adjust between102—10¹⁰Ω/cm2. When the temperature rises, the surface resistivity of the coating decreased, but it started to rise at 85℃, that's different from the solvent-borne coatings. As the humidity changes, the surface resistivity increased.Finally, a method of anti-static packaging design based on anti-static packaging theory was discussed. Its main contents are:(1)To determine the sensitivity of electrostatic discharge products; (2)To evaluate environmental conditions of transport; (3)Choose the appropriate packaging materials and packaging forms based on the specific environment and protection level; (4)To determine the different combinations of anti-static packaging based on the application and protection; (5)Mark the electrostatic sensitive warning signs and complete the anti-static packaging; (6)Check the pilot, In order to make the anti-static packaging design have a real effect, we must consider it with electrostatic discharge protection, the design process should be integrated into to the whole electrostatic discharge control procedures for consideration and strive to meet the protection and reduce costs.