Production method and process management method of polyacrylic acid (salt)-based water-absorbent resin

Abstract

[Problem] To manufacture a high-performance, multifunctional water-absorbing resin with high productivity while minimizing problems that could occur when scaling up manufacturing (in particular, to a production volume of 100 kg / hr or more), namely performance decreases, performance variability, and products that do not meet specifications, using a manufacturing method that includes a large number of linked manufacturing steps. Also, to manage the manufacturing process. [Solution] A method for manufacturing a water-absorbing polyacrylate resin, said method including the following steps: a polymerization step in which an aqueous solution of an acrylate monomer is polymerized; a drying step in which a cross-linked polymer in a water-containing gel state is dried; a surface-treatment step in which water-absorbing resin particles are surface-treated; and a water-absorbing-resin filling step after the surface-treatment step. Said steps are connected by piping. This method for manufacturing a water-absorbing polyacrylate resin also includes a sampling step in which a sample is taken from the water-absorbing resin, which from the end of the surface-treatment step to the end of the filling step is falling downwards.

Description

Method for manufacturing polyacrylic acid (salt) water-absorbing resin and its process management method Technical field The present invention relates to a method for producing a polyacrylic acid (salt)-based water-absorbing resin and its process management method. Background technique In recent years, as a constituent material of sanitary products such as paper diapers, sanitary napkins, and incontinence pads, water-absorbent resins for absorbing body fluids and the like have been widely used. As the physical properties required for this kind of water-absorbent resin, along with the high-functionality of the main application, namely paper diapers, in addition to the traditional basic physical properties, namely the water absorption capacity without pressure (CRC) and water-soluble content (Ext), Other examples include water absorption under pressure (AAP), water absorption speed (e.g. FSR, Vortex), liquid permeability (e.g. SFC, GBP), attractiveness, anti-coloring properties ...

AI Technical Summary

Problems solved by technology

Such problems occur in continuous production with a large production volume, continuous production including multiple processes, use of low-reactivity dehydration-reactive crosslinking agents, especially polyhydric alcohols or amino alcohols or derivatives thereof (such as alkylene carbonate) , Cyclic carbamate) cross-linking reaction is particularly evident

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