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

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Titanium dioxide,as a kind of high-quality white pigment filler, has a wide range of USES, such as plastic profile, color masterbatch, paint, emulsion paint, powder paint, paper making, chemical fiber and cosmetics, etc. It should be used for both the water system and the solvent system and the solvent-free system. There are additional requirements for selecting organic coating agents due to the different applications and application systems, and there are significant differences. Simple use of traditional TMP or peg can no longer meet the requirements and has some adverse effects, such as the bubble problem. According to the different USES of titanium dioxide, various organic treating agents should be used to treat the titanium dioxide to achieve a satisfactory treatment effect in the application. Different USES of titanium dioxide, titanium dioxide application processing performance requirements are also other.
Requirements for titanium dioxide for plastics
1. High viscosity dispersion/extrusion lubrication
To improve the strength of plastic products and reduce the cost, plastic products in the color filler added more and more, the proportion of resin is smaller and smaller, the compatibility and lubricity of each component are more and more difficult, easy to lead to the surface of plastic products rough and color uneven. Take the color masterbatch commonly used in the plastic industry as an example: the color masterbatch is generally made by extrusion and granulation of titanium dioxide powder after kneaded at high temperature using organic resin with a low density such as high-pressure polyethylene or polyethylene wax as the carrier. To produce a high concentration of white masterbatch and avoid low resin compatibility during the application, it is required to use as little carrier resin as possible to moisten as much titanium dioxide as possible. Therefore, titanium dioxide used in the production of masterbatches must have excellent surface wettability and lubrication properties. Otherwise, it will be challenging to granulate, challenging to disperse or distribute unevenly in use.

2. Temperature/weather resistance
The vast majority of plastic products, no matter what kind of resin, no matter what processing method, need to be in the high-temperature melt state with titanium dioxide and other additives before processing and forming. The processing temperature of plastic products is around 200 degrees (or even higher). If some components decompose at this temperature, pigment migration and porosity will be caused, seriously affecting plastic products’ surface quality and physical strength. Therefore, the temperature resistance of each component in the formula must be excellent. Besides, for most plastic products (such as plastic film, plastic electrical appliances) used in an outdoor or healthy light environment, UV resistance must also be considered. In the processing of PVC plastic products, a lead stabilizer is usually added. This kind of stabilizer is easy to react with other active chemical materials at high temperatures and produce black substances, which is the “lead black” problem in plastic processing. Therefore, the organic coating agent on the titanium dioxide surface must be entirely inert for the lead stabilizer.

3. Dry powder fluidity/moisture resistance
More and more factories use continuous production line in plastic products, related raw materials (such as resins, fillers, pigments) will also use transmission belt or vibration leakage sieve equipment to continuously automatic metering. Suppose the flow of titanium dioxide dry powder is not good. In that case, it will be stuck in the transmission belt or plug the screen hole, resulting in titanium dioxide that can not be accurately measured and smoothly added, thus affecting the quality of plastic products.

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