Processing Promotors:Additives for Rubber Compounds that improve mixing and processing by increasing the level of dispersion,reducing viscosity and speeding the flow of the compound through the production process

摘要

Processing Promoters:Additives for Rubber Compounds that improve mixing and processing by increasing the level of dispersion,reducing viscosity and speeding the flow of the compound through the production process The efficient mixing of rubber compounds comes with many challenges.These include effectively blending the individual raw materials which involves breaking down and blending different types of elastomers,adequately dispersing large fractions of fillers, oils and small weighments of chemicals in a relatively short time in the internal mixer. Once mixed,the compound then must be processed:e.g.extruded,calendared,or molded to form the desired shape which is then vulcanized to produce the final product.The choice of the correct processing promotor will assist in these efforts. Certain promotors function primarily as dispersing agents,whereas others act more as lubricants to speed the mixed compound through the production process.Both types improve overall compound quality and production efficiency.Compound viscosity typically is also reduced.This paper will focus on a number of processing promotors offered by Rhein Chemie,and their effects on rubber compound quality and processability.Aktiplast~R promotors are usually metal salts of unsaturated fatty acids which influence compound cure behavior.Aflux~R promotors consist for example,of fatty esters,amides and alcohols which do not influence vulcanization.Rhenopren~Rare factices(vulcanized vegetable oils)that provide various improvements for example in uncured shape retention,surface appearance and some level of reinforcement. Rhenosin~R are blends of hydrocarbon resins that aid in dispersion,compatibility and viscosity reduction.Properties of rubber compounds with and without each of these types of processing promotors will be presented and discussed. Note:all figures,tables,charts and graphs referenced in this paper are shown at the end of the text.