Solutions for Masterbatches - Sachtleben Chemie GmbH

More documents

Recommendations

Info

Inorganic UV – AbsorbersAdditive masterbatches are coming increasingly into use for theproduction of transparent packaging and agricultural films and foils.Sachtleben supplies tailor-made products for these applications. TheHOMBITEC RM130F and HOMBITEC RM230L TiO 2grades are highlyefficient transparent UV absorbers based on Sachtleben’s technologyfor the production of ultra-fine titanium dioxides.UV radiationIn addition to visible light, sunlight also contains electromagneticwavelengths which are not perceptible to the human eye. High-energyUV-A and UV-B radiation, in particular, constitute a significant potentialdanger to organisms, organic substances and pigmented systems.The crystal size of pigmentary titanium dioxide is around 200-300nm, that of ultra-fine titanium dioxide around 10-15 nm. Pigmentarytitanium dioxide scatters visible light most efficiently and impartsgood hiding power, whereas ultra-fine titanium dioxide effectivelyabsorbs UV light and transmits visible wavelengths through thecrystal. Ultra-fine TiO 2thus no longer exhibits pigmentary propertiesbut is, instead, transparent, and can therefore be used as an efficientinorganic UV absorber in pigmented systems and in clear systems.UV absorbers based on ultra fine-particled titanium dioxide longago proved their efficiency in such applications. These systems arenotable for their high transparency, lack of migration hazards andtheir extremely good absorption performance. This property profileis also indispensable for UV protection in packaging applications.UV-VIS transmission ofunmodified polymer andpolymer modified with HOMBITECPolymer: LDPE Elenac/Lupolen 1800H Film thickness: 50µmTRANSMISSION [%]1009080706050403020with 0.5% wt. HOMBITEC RM 230 Lwith 0.5% wt. HOMBITEC RM 130 F10no UV absorber0250 350 450 550 650WAVELENGTH [nm]Sachtleben supplies tailor-made transparent TiO 2grades for a rangeof sophisticated applications. The individual grades of ultra-fineHOMBITEC TiO 2differ in their crystallite size, surface treatment andcrystal-lattice doping. Once incorporated, HOMBITEC, an inorganicmaterial, is immune to migration. Its UV-absorption characteristicstherefore remain constant throughout the service-life of the polymer,in contrast to organic UV absorbers, the performance of which declinesdue to migration and/or destruction as a result of weathering.Thanks to a doping process which greatly reduces the photo activityof the TiO 2base, combined with further treatment which assuresuniform particle-size distribution and good dispersibility, theHOMBITEC RM130F and 230L grades are suitable for use in polymers.Organic coatingInorganic coatingHOMBITEC RM assures better long-term UV protection andhigher efficiency than organic UV absorbers.TiO 2Artificial weathering oforganic UV absorbersprior to weatheringArtificial weathering ofinorganic UV absorbersafter 400hTRANSMISSION [%]0.5% UV absorber (org.)0.5% HALSTRANSMISSION [%]0,5% HOMBITEC0,5% HALS14WAVELENGTH [nm]
Performance Impactof organic coatingBoth the effectiveness and the transparency of the system as awhole are highly dependent on the dispersion of the micro-rutile inthe polymer. The production of HOMBITEC RM therefore featuresan adjusted organic after-treatment (coating) which guaranteeseasy incorporation and excellent dispersion of the product inpolymers. In case of an unlikely incompatibility HOMBITEC RM 230Pas uncoated version of HOMBITEC RM 230L would be available.Good dispersionPoor dispersionThe effectiveness of HOMBITEC RM dispersion can be controlledusing UV/visible spectra. In the visible range, the transparency ofan LDPE film extended with 0.5% HOMBITEC RM should be similarto that of the non-protected specimen.In the ultraviolet wavelength range (250-400 nm), on the other hand,transmission is reduced as a function of absorber concentration.The better the dispersion, the better high energy UV-A and UV-Bradiation is effectively absorbed.TRANSMISSION [%]10080604020Good dispersionPoor dispersionPolymer: LDPE Elenac/Lupolen 1800H Film thickness: 50µm0250 300 350 400 450WAVELENGTH [nm]500 550 600 650HOMBITEC RM 130 F is a highly efficient transparent UV absorberbased on Sachtleben‘s microrutile technology.Its organic coatingand small primary particle size assure good dispersibility and highperformance. HOMBITEC RM 130 F is suitable for all packagingsystems requiring high transparency, color neutrality and effectiveUV protection of the packaged goods.HOMBITEC RM 230 L is a highly efficient transparent UV absorberbased on Sachtleben‘s microrutile technology. Its organic coatingand small primary particle size assure good dispersibility and highperformance in polymers. Thanks to its reduced photoactivity, thisproduct is an excellent choice for long-term applications such asindustrial wrapping films and agricultural foils. Photo-stabilizationis significantly improved by special doping of the micro-rutilecrystallite base and additional inorganic surface treatment.homBITEC RM130 f homBITEC RM 230 LAppearance odourless white powder odourless yellowish powderTiO 2[%] ~ 76 >70Modification Rutile RutileOrganic modification Stearic Acid Stearic AcidVolatiles (105° C/1h) [%] ≤ 5 ≤ 3Bulk density [kg/m 3] ~ 230 ~ 150Crystal size [nm] ~15 ~ 2015
Page 1 and 2: Solutions FOR MasterbatchesGreat So
Page 3 and 4: Specialities for MasterbatchesSacht
Page 5 and 6: White pigments - Rutiles for outdoo
Page 7 and 8: Lacing and dye build-upThe majority
Page 9 and 10: white pigments - AnATASE TITANIUM D
Page 11 and 12: HOMBITAN MCT 300 -A Highly sophisti
Page 13: LITHOPONE 30%DSThe rheological and
Page 17 and 18: Higher doses of the organic compone
Page 19 and 20: The gradesDepending on the required
Page 21 and 22: Cost-efficient solutionsThe pigment
Page 23 and 24: Sustainable and forward lookingSust

Solutions for Masterbatches - Sachtleben Chemie GmbH

Create successful ePaper yourself

Delete template?

Save as template?