Specific application of titanium dioxide in the plastics industry and color masterbatch industry

Titanium dioxide for ordinary plastics generally does not undergo surface treatment, because the inorganic coated titanium dioxide such as conventional hydrated alumina, when the relative humidity is 60%, its adsorption equilibrium water is about 1%, when the plastic is extruded at high temperature. When processed, water evaporation causes pores on the smooth plastic surface. This inorganic coated titanium dioxide is usually subjected to organic surface treatment (polyol, silane or siloxane) because titanium dioxide for plastics Unlike titanium dioxide used in coatings, the former is processed by shearing force in a low-polarity resin, and the organic surface-treated titanium dioxide can be dispersed well under appropriate mechanical shearing force.

With the continuous application of plastic products, many external plastic products, such as plastic doors and windows, building materials and other outdoor plastic products, have high requirements on weather resistance. In addition to the use of rutile titanium dioxide, surface treatment is required. This surface treatment is generally free of zinc, and only silicon, aluminum, zirconium, etc. are added. Silicon has a hydrophilic dehumidification effect, which prevents pores from being generated by evaporation of water when the plastic is extruded at a high temperature, but the amount of these surface treatment agents is generally not too much.

The quality requirements for plastic products for titanium dioxide in plastic additives are:

Covering power: Titanium white with good hiding power, and the produced plastic products are lighter and thinner;

Whiteness: determines the appearance of light or white plastic products;

Dispersibility: affecting the production cost of plastic products. Titanium white with poor dispersion will affect the smoothness and brightness of the products in plastic products;

Weather resistance: Plastic products for outdoor use, plastic doors and windows, etc. must ensure the weather resistance of titanium dioxide.