Binding agent with viscosity of 50-80 mPa.s, and preparation method and application thereof

The invention discloses a binding agent with viscosity of 50-80 mPa.s, and a preparation method and application thereof. Cellulose with the polymerization degree of 600-800 used as the raw material is subjected to alkalization treatment and etherification treatment under certain technological conditions to obtain the binding agent with the viscosity of 50-80 mPa.s. The binding agent has proper viscosity, and thus, has favorable binding effect when in use; in the later manufacturing period of the knob insulator, the drying can be completed by calcining at 750 DEG C for 3 hours, thereby greatly lowering the energy consumption; and the binding agent has favorable water solubility, can be dissolved in water at normal temperature, and thus, is very convenient to use, thereby saving the energy consumption for dissolving the binding agent. The sulfated waste cotton wool is used as the raw material for preparing cellulose; and the cellulose with the polymerization degree of 600-800 contained in the sulfated waste cot