Study on the requirement of organic primer for titanium dioxide in the plastics industry

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As a white pigment filler of high quality, has many applications, including in plastic profiles, colormasterbatch, paints, emulsions paints, powders paints for papermaking, cosmetics and chemical fibers. It can be used with both the solvent and water systems. The different application and application systems have additional requirements in selecting organic coatings agents. Traditional TMP and peg are no longer sufficient to meet these requirements. They also have some negative effects, like the bubble problem. The organic treatment agents used should depend on the titanium dioxide’s different USES. In addition to the different USES for titanium dioxide, there are also differences in titanium dioxide application performance requirements.
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 plastic product surface to be uneven and have a rough texture. 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 as many titanium dioxide particles as 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 surface wetting and lubrication characteristics. 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 must have excellent temperature resistance. Besides, the UV resistance of most plastic products, such as plastic films, electrical appliances, used outdoors or in a healthy light environment must be taken into consideration. A lead stabilizer will be added to PVC products during processing. 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 factories adopt continuous production lines for plastics products, raw materials related to them (such as fillers, resins and 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, making it impossible to accurately measure and add titanium dioxide.

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