Viscosity is one of the important properties of liquid water glass. It modulus and sodium silicate, the concentration, temperature and the type of alkali metal and proportion of about. The size of the water glass viscosity, has a plastic coating for coating a significant impact, it will directly affect the performance of the pressure applied to the electrode, such as for dry coating appearance quality, moisture resistance and drug skin strength. Production practice shows that the viscosity is too high when using sodium silicate paint preparation, easy to make the paint stick to the mixer, it is difficult to obtain uniform mixing paint, painted when the pressure is difficult to control rod eccentric; screw machine during production, paint easy to heat, hardened, so that the pressure applied to the production of hard normally. Flow glass viscosity is poor, then paint the plastic, less sticky, coated electrodes when pressed, not only the electrode coating surface roughness is not only, but also easily lead to both ends of the rod is exposed.

From the above, the viscosity of the water glass on the welding rod production has a big impact, but the domestic water glass electrode factory viscosity of research, testing were not enough, the majority of production experience alone, go find problems to solve. According to data from abroad, with the viscosity of liquid water glass manufacturing welding 0.74~0,8pa * s 5 can achieve good visual quality and higher productivity.

It should be noted that, in analyzing the influence of the viscosity of liquid water glass rod to dry and for baking, it is worth noting that water glass in the air. Under c02 role, the higher the viscosity, the faster the surface of the conjunctiva, the conjunctival surface will hinder the internal moisture continues to spread and evaporate out, so when dry and for baking, electrode coating drying rate increases with the viscosity large increases.

Producing a sintered electrode specific viscosity of silicate flux is generally used for 0.8~0,9pa * s, 3 the viscosity is too low, the strength of the particle flux | is low, the process is easy to transport and use of pulverized; silicate viscosity is too high, the production the granulation process in the flux, the flux capacity | roller Cheng Yi lump crushing process to cause problems, irregular crushed solder particles during transport and use, there will crush phenomenon.