In the Plastic industry is the second largest user of titanium dioxide, it is the fastest growth in recent years, the average annual growth rate of 6%,More than 500 chain brand around the world with 50 brand belongs to the special plastic.Titanium dioxide in the application of plastic products, in addition to using its high covering power, high decoloring force and other pigment performance, it can also improve the plastic products of heat, light resistance, weather resistance, make the plastic products from UV light, improve the mechanical properties and performance of plastic products.Because plastic products is film thickness than paint and ink,it does not require too much pigment volume concentration,and its have high covering power, strong tinting strength, general consumption is only 3% ~ 5%..Almost all thermosetting and thermoplastic plastics to use titanium dioxide,Such as polyolefins (mainly low density polyethylene), polystyrene, ABS, PVC, etc.It can be mixed with resin powder, can also be blended with liquid containing plasticizers,And some use premise is to put the titanium dioxide processing colour masterbatch

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

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

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

　　Plastic components including resin, fillers, plasticizer and other additives,According to product processing methods can be divided into extrusion blow moulding technology of plastic film, plastic sheet extrusion molding process and plastic injection molding process.Such as:

　　Extrusion blow moulding technology of plastic film:

　　Resin, fillers, additives masterbatch ingredients (masterbatch) and resin film blowing plastic film

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

　　Plastic plasticizing, injection molding and injection molding process includes three stages of cooling, the commonly used equipment have embolism type injection machine, screw injection machine, etc

　　Plastic products are the requirements for the quality of titanium dioxide as follow:

　　1.covering power:Covering power more good titanium dioxide to produce plastic products more thin

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

　　3.dispersibility:Affect the cost of plastic products production, not good dispersion of titanium white in the plastic products will affect the smoothness of the products and brightness

　　4.weather fastness:Outdoor use of plastic products and plastic doors and Windows must ensure that the weather resistance of titanium dioxide.