How About the Special Magnesium Oxide Used for Adhesive?

   The adhesive is a major consumer of magnesium oxide. Generally speaking, a standard adhesive enterprise need to consume about two tons of magnesium oxide every month. This fully explains that the magnesium oxide is an indispensible raw material to produce adhesive. Now, let us look at the special magnesium oxide used for adhesive in more detail.

   The active magnesium oxide is one of the important raw material of chloroprene rubber adhesive agent, the activity of magnesium oxide can reflect the reaction capacity between magnesium oxide and chloroprene rubber adhesive agent. The higher activity, the faster reaction rate with chloroprene rubber adhesive agent. The active magnesium oxide’s effects are extensive: sulfurization crosslinking agent, acid absorption, scorch safety, and so on. Because of its large specific surface area and high activity, it can used in chloroprene rubber adhesive agent, and improve the initial adhesion and adhesive strength of adhesive. What’s more, it can improve adhesive’s transparency. The most important feature is to prevent precipitated and separated. Generally speaking, the activity of active magnesium oxide is indicated by the iodine absorption value(mgI2/g). When the iodine absorption value is less than 40, it is the low activity. When the iodine absorption value is from 40 to 100, it is the middle activity. And when the iodine absorption value is higher than 100, it is high activity. The chloroprene rubber adhesive agent with high quality general uses high active magnesium oxide.

  During the reaction process, the active magnesium oxide reacts with tert butyl phenolic resin. It requires that the active magnesium oxide has a high activity(the iodine absorption value is higher than 100), large specific surface area, fine particle, good dispersibility and proper bulk density(from 0.29/cm3 to 0.3g/cm3). If the bulk density is large, it is easy to precipitate. If the the bulk density is small, the operating environment is execrable. In addition, the active magnesium oxide should be protected against moisture. Because the moisture adsorb on the surface of active magnesium oxide. It makes that the activity of active magnesium oxide becomes lower. Therefore, the reaction process is affected. So the active magnesium oxide must be controlled the moisture content before using, the better is drying. The better active magnesium oxide, which used for this reaction process, is produced by Meishen Technology is better than other magnesium oxide manufacturers.