The Application of Titanium White Powder in Rubber
Rubber is an organic polymer compound, which is divided into natural rubber and synthetic rubber according to different sources, with the common characteristic of high elasticity. In the rubber industry, several or a dozen additives such as vulcanising agents, accelerators, active agents, antioxidants, reinforcing agents and colourants have to be added in order to improve the process performance of the raw rubber and the performance of the vulcanised rubber, which causes physical and chemical changes in the rubber.
Titanium dioxide is a good colouring agent because it has stable physico-chemical properties, small particles and does not contain impurities that damage the vulcanisation process, such as manganese, copper, cadmium, cobalt etc. It does not damage the vulcanisation process. Due to its high achromatic and hiding power, a small amount of titanium dioxide can be used to achieve good results without affecting the tensile strength, elongation and bending properties of the product. Also, it is highly resistant to sunlight and does not crack or change colour under sunlight, so it is generally used in white and light coloured rubber products. The rubber products made of titanium dioxide have the characteristics of slow ageing, high strength, high stretch rate, and not easy to fade. In addition, it also has a filling, anti-ageing, acid and alkali resistance and in the silicon rubber reinforcement role. Titanium dioxide is therefore indispensable in the rubber industry.
The quality of titanium dioxide for rubber has the following requirements: ① good heat resistance, to be vulcanised at 110-170°C without yellowing; ② good stability to sulphur and other additives; ③ high achromatic and covering power; ④ no adverse effects on the performance of rubber products (such as physical and mechanical properties and ageing properties); ⑤ copper, manganese, cadmium, cobalt and other harmful impurities to be less; ⑥ particles should be small and easy to disperse evenly.
