Yuan Lei's Little Knowledge | Application Performance Analysis of Titanium Dioxide in Plastics
Plastic is the second largest user of titanium dioxide, more than 500 titanium dioxide brands in the world, there are more than 50 brands are plastic-specific. The application of titanium dioxide in plastic products can improve the heat resistance, light resistance and weather resistance of plastic products, protect plastic products from UV light, and improve the mechanical and electrical properties of plastic products.
It is used in almost all thermosetting and thermoplastic plastics, such as polyolefins (mainly low-density polyethylene), polystyrene, ABS, polyvinyl chloride, etc. It can be mixed with resin dry powder, and can also be mixed with plasticizer-containing liquids, and some titanium dioxide is processed into masterbatches before use.
Specific Application Analysis of Titanium Dioxide in Plastics Industry and Color Masterbatch Industry
◆ Plastic industry
Most of the plastic with titanium dioxide particle size is relatively fine, usually with titanium dioxide coating particle size of 0.2~0.4 μm, while the plastic with titanium dioxide particle size of 0.15~0.3 μm, so that you can get the blue base phase, the majority of the yellow phase of the resin or easy to yellowing resin shielding effect.
Ordinary plastic with titanium dioxide is generally not surface treatment, because the use of conventional hydrated alumina such inorganic coated titanium dioxide, in the relative humidity of 60%, the adsorption balance of water in about 1%, when the plastic in high temperature extrusion processing, water evaporation will lead to smooth plastic surface pores.
There are four main quality requirements for titanium dioxide in plastic products, namely, hiding power, whiteness, dispersion and weather resistance. Good hiding power can make plastic products thinner; whiteness determines the appearance of plastic products; poor dispersion of titanium dioxide in plastic products will affect the smoothness and brightness of the products; outdoor use of plastic products and plastic doors and windows must ensure the weather resistance of titanium dioxide.
Plastic masterbatch is a highly concentrated, high-performance color configuration products. It is mainly composed of a core layer (pigment), a coupling layer (coupling agent or surfactant), a dispersion layer (lubricant or dispersant), and a mixing layer (carrier resin). It is used as a coloring agent in plastics and is widely used in the production of plastic products such as blown film, injection molding, hot pressing, and injection molding.
Masterbatch can be used for PVC, polyethylene, polypropylene, polystyrene and ABS plastic color matching. Its main components are pigments, resins, dispersants, volume pigments, fluorescent whitening agents, antioxidants, anti-ultraviolet agents, antistatic agents, toughening agents, brighteners, etc., titanium dioxide is used as a white pigment in which it has the advantages of non-toxic, stable chemical properties, high hiding power, and good dispersion.
Masterbatch is used as an industrial raw material, and its performance is usually shown in the application of subsequent products (such as film blowing or injection molding). Therefore, the performance of titanium dioxide in color particles is mainly reflected in the application process of color masterbatch, mainly reflected in the coloring ability, whiteness and dispersion processing performance of titanium dioxide, affecting the usage of titanium dioxide, the appearance and gloss of plastic products, and the production cost of color masterbatch.
Analysis, titanium dioxide, plastic products, plastics, masterbatch, properties, resin, pigment, use, dispersion
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