The invention relates to a production method of a water-blocking band, in particular to a production method of a semi-conductive buffer water-blocking band. The production method comprises the following steps: firstly, supercharging and soaking a high-temperature resistant
polyester sponge and terylene cloth in conductive liquid, spraying high water-absorbent resin on the terylene cloth and compounding the high-temperature resistant
polyester sponge and the terylene cloth; then, spraying the conductive liquid with a high-pressure spray gun and
drying the high-temperature resistant
polyester sponge and the terylene cloth which are compounded in vacuum at a high temperature; and finally, coiling,
cutting and packaging the high-temperature resistant polyester sponge and the terylene cloth which are compounded in vacuum to be a finished semi-conductive buffer water-blocking band . Proved by detection, the semi-conductive buffer water-blocking band has the advantages of
high intensity, thinness, rapid swelling in water, high water absorption, good water-blocking effect, high-temperature environment influence resistance, small surface resistance,
low volume electric resistivity, European Union
environmental protection accordance, and the like, can satisfy the water blocking and the
electric field shielding among parts of power cables, and the like, maintains the safe use of the cables, can generate the semi-conductive shielding action so as to buffer an
electric field, can be lined at the inner side of a
metal protective sleeve to buffer the friction between the inner protective sleeve and the
metal protective sleeve and can satisfy the normal
working temperature of the cables.