In the Plastic industry is the second largest user oftitanium dioxide, it is the fastest growth in recent years, the average annualgrowth rate of 6%,More than 500 chain brand around the world with 50 brandbelongs to the special plastic.Titanium dioxide in the application of plasticproducts, in addition to using its high covering power, high decoloring forceand other pigment performance, it can also improve the plastic products ofheat, light resistance, weather resistance, make the plastic products from UVlight, improve the mechanical properties and performance of plasticproducts.Because plastic products is film thickness than paint and ink,it doesnot require too much pigment volume concentration,and its have high coveringpower, strong tinting strength, general consumption is only 3% ~ 5%..Almost allthermosetting and thermoplastic plastics to use titanium dioxide,Such aspolyolefins (mainly low density polyethylene), polystyrene, ABS, PVC, etc.Itcan be mixed with resin powder, can also be blended with liquid containingplasticizers,And some use premise is to put the titanium dioxide processingcolour masterbatch

　　Most plasticwith titanium dioxide particle size is fine, usually coating titanium dioxidewith particle size of 0.2 ~ 0.4 µm.But plastic grade titanium dioxide withparticle size of 0.15~ 0.3 µm,So that we can get the bottom of the bluephase,It has covered the role of most with yellow phase of resin or resin proneto yellowing.

　　Ordinaryplastic with titanium dioxide is generally not after surface treatment,Becausethe conventional hydrated alumina this kind of inorganic coating of titaniumdioxide, when relative humidity of 60%, the adsorption equilibrium of water isabout 1%.When plastic in the high temperature extrusion processing, waterevaporation can lead to smooth plastic surface blowhole, this without inorganiccoating of titanium dioxide, typically through organic surfacetreatment.Because of different the plastic with titanium dioxide and coatingwith titanium dioxide,Plastic with titanium dioxide is in the resin of lowpolarity by shear force is mixed, organic surface treatment of titaniumdioxide, under the appropriate mechanical shear force, can be well dispersed.

　　With theexpansion of the plastic products application range, many external use plasticproducts, such as plastic doors and Windows, construction materials such asplastic products, outdoor weather resistance and have high requirements,besides must use the rutile titanium dioxide, surface treatment is needed, thesurface treatment is generally not add zinc, only add silicon, aluminum,zirconium, etc.Silicon's water to wet function can prevent the high temperatureplastic extrusion due to evaporation air hole, but the quantity of the surfacetreatment agent is generally not too much.

　　Plasticcomponents including resin, fillers, plasticizer and other additives,Accordingto product processing methods can be divided into extrusion blow mouldingtechnology of plastic film, plastic sheet extrusion molding process and plasticinjection molding process.Such as:

　　Extrusionblow moulding technology of plastic film:

　　Resin,fillers, additives masterbatch ingredients (masterbatch) and resin film blowingplastic film

　　The processis the main equipment has double roller mixing machine, blown film machine,etc.

　　Plasticplasticizing, injection molding and injection molding process includes threestages of cooling, the commonly used equipment have embolism type injectionmachine, screw injection machine, etc

　　Plasticproducts are the requirements for the quality of titanium dioxide as follow:

　　1.coveringpower:Covering power more good titanium dioxide to produce plastic productsmore thin

　　2.whiteness:Decidethe appearance of the light color or white plastic products

　　3.dispersibility:Affectthe cost of plastic products production, not good dispersion of titanium whitein the plastic products will affect the smoothness of the products andbrightness

　　4.weatherfastness:Outdoor use of plastic products and plastic doors and Windows mustensure that the weather resistance of titanium dioxide.