bentonite clay powder

Bentonite used in foundry is mainly used in clay bonded sand, because bentonite has the characteristics of strong cohesion, high plasticity, good film removal, excellent permeability, high temperature and wet state, stable physical and chemical properties and so on. Clay bonded sand casting production as modeling materials, this process is a long history, in the vigorous development of various chemical bonded sand - clay wet sand is still the most important molding material, its applicable scope, the consumption of large, any other other materials can be compared.

 High pressure molding, injection molding, static pressure molding and impact molding, vacuum pressure shock and other modern new technology, are to use clay wet sand as the premise, the ability to adapt to other conditions of greensand is extremely strong. Casting bentonite is mainly sodium bentonite and calcium sodium bentonite two, sodium bentonite by natural sodium bentonite or artificial Na bentonite processing, with its good reusability and high wet strength by the foundry industry are welcome. Due to its good plasticity, can prevent sand casting, scarring, drop phenomenon, block sand mold collapse, and forming strong cavity, high strength, easy metal casting industry wet or dry state mould precision casting sand binder is preferred. Calcium sodium bentonite is made from natural base calcium sodium bentonite, and it is a molding sand binder commonly used in light castings. It is welcomed by users because of its practicability and convenient casting sand cleaning. Compared with other binders, bentonite has an important characteristic, that is, it has a certain heat resistance. As long as the heating temperature is not too high, the bentonite with free water can restore the viscosity as long as the water is added. The cohesive ability of bentonite can only be expressed after adding water. The loss of cohesive capacity of bentonite is also related to its dehydration.