Special material for cleaning plastic screw extruder and preparation method

Abstract

The invention relates to the field of functional plastic, and specifically relates to a special material for cleaning a plastic screw extruder and a preparation method. A thermoplastic elastomer is used as a carrier; through compounding a ceramic micro-sphere, a poly-prismatic particulate stripper, which is prepared from polytetrafluoroethylene clad quartz sand, and an activator, the high-efficiency stripping and cleaning on a scale deposit and a residue in the screw extruder are realized; the special material is not only high in cleaning efficiency, but also avoids the damage of high-shearing grinding to a screw. Particularly, the special material is mainly prepared from inorganic matters, keeps stable melt viscosity at both a high temperature and a low temperature, generates stable adhesive stripping and shearing friction to the screw, and has favorable adhesive stripping performance and frictional scraping performance on the scale deposit and the residue in the screw when being used; meanwhile, special plastic can be repeatedly used, has favorable anti-degradation performance and anti-oxidation performance; especially, the special plastic is used for similarly better removing the scale deposit of the screw for processing complicated components of modified plastic, high-viscosity plastic, cross-linked rubber and the like by utilizing the stripping property and the viscoelastic property of the special plastic.

Description

technical field [0001] The invention relates to the field of functional plastics, in particular to a special material for cleaning a plastic screw extruder and a preparation method thereof. Background technique [0002] With the rapid development of polymer science and technology, society has higher and higher requirements for polymer materials. It is usually necessary to modify polymer materials by alloying, blending, cross-linking, and compounding methods in order to maximize the properties of polymers. In particular, the existing functional plastics and functional rubbers are developing toward high specific strength, high specific modulus, and high toughness. The added functional modifiers not only put forward higher requirements for the processing equipment screw extruder, but also It is easy to carbonize and stick in the screw extruder, and the composition is complex, so it is difficult to simply clean it with conventional clean plastic. Moreover, the existing screw e...

AI Technical Summary

Problems solved by technology

The resin contained in the existing cleaning agent has different melting flow at different temperatures. If the residue at a high temperature is cleaned, the screw needs to be raised to a high temperature, which can easily cause the cleaning agent to have too high fluidity, and it is difficult to generate shear and friction. The cleaning effect of the screw is reduced, and even the high temperature causes the cleaning agent to fail or decompose, resulting in fouling of the secondary screw