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Plastics – Requirements on titanium dioxide
1. High viscosity extrusion/dispersion lubricant
As plastic products become stronger and cheaper, they add more color filler. However, as the resin proportion decreases and compatibility between components becomes more challenging, it can cause the surface to be rough and uneven in color. Consider the colormasterbatch that is commonly used in plastics: it’s made by extrusion of titanium dioxide and granulation after being kneaded with high temperature organic resins such as polyethylene wax or high-pressure polyester. It is necessary to use the least amount of carrier resin to moisten the most titanium dioxide possible in order to achieve a high-concentration white masterbatch. This will avoid low resin compatibility when applied. In order to produce masterbatches, titanium dioxide must have excellent wettability on the surface and excellent lubrication. If not, it is difficult to granulate or disperse.
2. Temperature/weather Resistance
Before processing or forming, the vast majority of plastics products, regardless of their type, processing method or resin, must be in high-temperature melt with titanium dioxide and additives. Processing temperatures for plastics are around 200 degrees, or higher. The decomposition of some components at this temperature will cause pigment migration, porosity and a serious impact on the physical strength and surface quality of plastic products. Each component of the formula should have excellent temperature resistance. For plastics used outdoors or in a healthy light environment (such plastic films, electrical appliances, etc.) UV resistance should also be taken into consideration. In PVC products, a stabilizer containing lead is added. This type of stabiliser is easily reacted with other active chemical substances at high temperature and produces black substances. Lead stabilizers cannot react with organic coating agents on titanium dioxide surfaces.
3. Dry Powder Fluidity/Moisture Resistant
As more and factories adopt continuous production line for plastics, raw materials related to it (like resins, fillers or pigments) are also metering continuously using transmission belts. Imagine that the flow rate of titanium dioxide dry is low. The powder will then get stuck in the belt of the transmission or block the screen hole. This can lead to titanium dioxide not being accurately measured or added smoothly.
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