The use of zinc oxide in rubber is becoming increasingly widespread. It is important to select appropriate operating methods during use, as the benefits of its application continue to grow. Let us now take a look at the natural stability properties of zinc oxide in rubber.

   The stability of zinc oxide latex is directly related to the concentration of the latex, the presence of yellow bodies, the protein content and the extent of protein degradation. High-concentration latex exhibits lower zinc oxide stability; conversely, the higher the proportion of yellow bodies and the lower the content of yellow viscous bodies, the greater the zinc oxide stability. Both artificial and natural protein degradation will reduce zinc oxide stability. The destabilising effect of zinc oxide is related not only to the solubility of zinc but also to the formation of zinc ammonium ions. Increasing the temperature accelerates the formation of low-ammonia zinc ammonium complexes, thereby enhancing the destabilising effect; increasing the ammonia content has a similar effect.

   Many researchers have studied the destabilising effect of zinc oxide in ammonia-added latex, and there is a consensus that this effect arises from the formation of divalent zinc ammonium complexes and insoluble zinc soaps. In natural latex containing zinc oxide, the addition of ammonium salts or ammonia can generate divalent zinc-ammonium complexes. When sufficient ammonia is present, the number of positively charged complex ions may increase to a level sufficient to destabilise the latex particles. This reduces the thickness of the protective layer on the particles, lowering the potential to a critical value, whilst the zinc-ammonium complexes react with the soap in the latex, thereby losing their protective effect.

   The above details the natural stabilising properties of zinc oxide in rubber. Should you encounter any uncertainties during the process, please do not hesitate to contact us for advice to avoid losses resulting from improper handling. Only by strictly adhering to the operating procedures can the desired results be achieved. We hope the information provided here proves helpful.