受控自由基聚合 （CFRP） 分散剂技术.pdf

1、InternalControlled Free Radical Polymerization(CFRP)Dispersant TechnologyTony MoySr.Technical SpecialistBASF Formulation AdditivesSeptember 05,2024InternalAgenda Theory:Why Dispersing Agents Mode of Action Chemistry:Controlled Free Radical Polymerization(CFRP)Application Example:Showing benefits of

2、CFRP dispersant technology09.05.20242Controlled Free Radical Polymerization(CFRP)Dispersant TechnologyInternalDispersing AgentsWhat and Why Dispersants are chemical substances:Several forms:surface actives(surfactants)and polymersUsed to make dispersions of solids/particles(pigments)Stabilize and di

3、sperse(keep apart)pigment particlesHave two functional aspects:Pigment affinityCompatibility with medium09.05.20243Controlled Free Radical Polymerization(CFRP)Dispersant TechnologyInternalViscosityStrengthOpacityPhoto stabilityhigherlowerparticle sizePigment delivery form:agglomeratesOptimum coloris

4、tic properties at lower particle sizeMore pigment surface leads to viscosity increaseFavored energy statePrimary particlesAggregatesAgglomeratesFavored propertiesTheoryNeed for dispersion09.05.20244Controlled Free Radical Polymerization(CFRP)Dispersant TechnologyInternalTheoryThree steps:Wetting Bre

5、akdown Stabilization Reduction of surface tension differencebetween solid and liquid phase to improvepigment wettingPenetrationAir removalBreak down+“Energy Input”StabilizingWetting+“Dispersant”Pigment particle size reduction leads tounfavorable energy state Dispersant adsorbs on pigment surface top

6、revent re-agglomeration09.05.20245Controlled Free Radical Polymerization(CFRP)Dispersant TechnologyInternalCharge StabilizationElectrostatic Repulsion Main relevance for dispersions in water andinorganic pigments Stability can be disrupted by high saltconcentrationsrepulsive forceSteric or Entropic