Polyacrylic acid (salt) is the manufacturing method and its water absorbing agent of water absorbing agent

Polyacrylic acid (salt) is the manufacturing method and its water absorbing agent of water absorbing agent

  • CN 104,619,755 B
  • Filed: 08/20/2013
  • Issued: 03/15/2019
  • Est. Priority Date: 09/11/2012
  • Status: Active Grant
First Claim
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1. a kind of polyacrylic acid (salt) is the manufacturing method of water absorbing agent, there is the surface crosslinking agent addition of addition surface crosslinking agentStep and surface cross-linking step,The manufacturing method is characterized in that:

  • Simultaneously with surface crosslinking agent addition step, and/or liquid permeability is added after the surface cross-linking step and is mentionedThe liquid permeability elevator for rising agent adds step;

    Also,Environment in the heating part of heating device used in the surface cross-linking step, for heating absorbent resin powderMaximum temperature be 100~300 DEG C and minimum dew point lower than 45 DEG C and at -30 DEG C or more, the dew point by using steam,The water vapour that dry gas, nitrogen, helium, argon gas, dry air and the moisture contained by the absorbent resin powder generate comesIt is controlled,The heating device has the exhaust structure and/or gas supply mechanism that the steam occurred from heating object is discharged;

    Be supplied to heating device/from heating device be discharged air-flow flow be greater than 0 but be no more than 10000Nm3/ h or gas withThe ratio of the absorbent resin powder amount waiting being subject to processing is no more than 3000Nm3/ ton;

    The temperature for being supplied to the absorbent resin powder of the surface crosslinking agent addition step is 30 DEG C~100 DEG C,In the surface cross-linking step, the maximum temperature that absorbent resin powder is heated is 175 DEG C~230 DEG C.

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