Light Diffusion Master-batches: Preparation And Their Influence On The Performance Of Polycarbonate Composites

In this paper, Uniform dispersion of light diffusing agent, unstable optical performance inthe preparation of the light diffusing polycarbonate (PC) material, use multi-scale complex andmasterbatch technology to improve dispersion and compatibility of light diffusion agent in thePC, improved optical performance of light diffusion composite material. This worksystematically studied the preparation conditions of light diffusion masterbatch, usingtransmittance/haze tester, scanning electron microscopy, transmission electron microscopy anddifferential scanning calorimetry testing optical properties, structure and morphology, thermaland other properties of the light diffusion composites, study the effects of theoptical,mechanical,thermal system to improve the content of the light diffusing agent,thedifferent processing and various concentrations of masterbatch.The results show that masterbatchfilling technology is an effective solution to the light diffusing agent disperse difficulty in the PC,Unstable of the optical properties. The main contents are as follows：1. Using masterbatch filling method prepared three kinds of light-diffusing masterbatch. Bythe burning residual experiment of masterbatch, Identifing the light diffusing agent ofMKMP590, MPMMA content and MTiO2are9.74wt%,9.56wt%,9.46wt%, making thelight diffusing agent of PC light diffusion material having a more accurate content.2. Using masterbatch filling technology researching the effect of composite optical,mechanical and thermodynamic properties through changing light diffusion agent contentand types. PC and light diffusion agent mixed into the double screw extruder to give aconcentration of10wt%of the light diffusion masterbatch, then PC and light diffusionmasterbatch mixed to prepared the light diffusing composites by melt compoundingmethod, analyzing optical properties and microstructure of the samples. The resultsobtained: with the increasing of the light diffusing agent KMP590content, the haze of thecomposite from75.0%to92.0%and the transmittance of the composite from80.0%to57.0%; With the increasing of the light diffusing agent PMMA content, the haze of thecomposite from77.0%to93.0%and the transmittance of the composite from77.0%to 59.0%;When using a particle size of2.2μm of KMP590light diffusing agent,the tensile andimpact properties of the composites changed a little;When using a particle size of3.0μm ofPMMA light diffusing agent, the tensile properties of the composites changed a little,but theimpact properties of the composites changed from70kJ/m2to18kJ/m2. SEM imagesobserved: light-diffusing agent KMP590and PMMA dispersed in Light diffusioncomposite.3. Using different process preparing light diffusion composite, researching the effect ofproperties through using different process. Different process Include: direct method, singlescrew masterbatch method,double screw masterbatch method. The results obtained: usingthe direct method, with the increasing of the light diffusing agent content, the haze of theincreased to90.2%and the transmittance of the composite reduced to56.5%, showingfrom repeated experiments data, directly added method process is unstable, deviations ofdata is large,from2.509%to4.532%; Showing from SEM of the composite, the lightdiffusion agent dispersed unevenly in PC. Using the single screw masterbatch method, withthe increasing of the light diffusing agent content, the haze of the increased to91.8%andthe transmittance of the composite reduced to54.9%, showing from repeated experimentsdata, directly added method process is better, deviations of data is not large,from0.992%to3.542%; Showing from SEM of the composite, the light diffusion agent dispersed unevenlyin PC. Using the double screw masterbatch method, with the increasing of the lightdiffusing agent content, the haze of the increased to92.1%and the transmittance of thecomposite reduced to57.2%, showing from repeated experiments data, directly addedmethod process is stable, deviations of data is a little,from0.265%to2.490%; Showingfrom SEM of the composite, the light diffusion agent dispersed unevenly in PC.4. Using different concentrations of masterbatch preparing light diffusion composite, discussthe optical properties of composite materials what prepared by different concentrations ofmasterbatch.PC and light diffusion agent mixed into the double screw extruder to preparedmasterbatch of different concentrations filling(10wt%,20%wt,30%wt,50wt%),PC and lightdiffusion masterbatch mixed into the double screw extruder to prepared the light diffusing composites by melt compounding method, study of the optical properties and the deviationof repeated trials. The results obtained：the light diffusion composite what preparing bydifferent concentrations of masterbatch all have excellent performance, deviation of repeatthe test are small, deviation from0.311%to2.132%. However, during the preparation of thelight diffusion masterbatch, Loss of the light diffusing agent increases with increasing ofmasterbatch concentration, using the masterbatch concentration of10wt%or20wt%preparing the light diffusion composite is most appropriate.