초록 ▼

A method for the production of a highly water absorptive resin comprises the steps of neutralizing acrylic acid with alkali metal hydroxide to form an alkali metal acrylate; mixing the alkali metal acrylate, methacrylic acid, a polymerization initiator, and a first crosslinking agent; suspending and

A method for the production of a highly water absorptive resin comprises the steps of neutralizing acrylic acid with alkali metal hydroxide to form an alkali metal acrylate; mixing the alkali metal acrylate, methacrylic acid, a polymerization initiator, and a first crosslinking agent; suspending and dispersing the mixture in an aqueous medium to for an initial mixture; polymerizing the initial mixture to produce a polymerized intermediate, and separating the moisture from the polymerized intermediate by azeotropic distillation to reduce the water content to 15-35% by weight; adding a second crosslinking agent, said second crosslinking agent having two epoxy radicals; and mixing “Syloid”of silicate, to form a highly water absorptive resin.

대표청구항 ▼

A process for preparing a highly water absorptive resin comprising the steps of: (a) neutralizing crylic acid with an alkali metal hydroxide to produce an equivalent amount of alkali metal acrylate; (b) mixing about 70-90% by weight of the produced alkali metal acrylate of step (a), about 10-30% by

A process for preparing a highly water absorptive resin comprising the steps of: (a) neutralizing crylic acid with an alkali metal hydroxide to produce an equivalent amount of alkali metal acrylate; (b) mixing about 70-90% by weight of the produced alkali metal acrylate of step (a), about 10-30% by weight of methacrylic acid, a polymerization initiator, and a first crosslinking agent comprising N,N-methylene bisacrylamide to form an initial mixture; (c) dispersing the initial mixture in an aqueous medium and polymerizing the dispersed initial mixture to form a polymerized intermediate aqueous dispersion; (d) removing the water from the polymerized intermediate aqueous dispersion by azeotropic distillation to reduce the water content of the polymerized intermediate aqueous dispersion to about 15-35% by weight, wherein said polymerized intermediate comprised in the aqueous dispersion has an average particle size of about 100-150 m1.2-8% by weight based on the weight of the polymerized intermediate of a second crosslinking agent, said second crosslinking agent having at least two epoxy radicals for increasing the density of the surface thereof; and (f) mixing about 0.1-5% by weight of a silicon dioxide hydrate (SiO2.nH2O) wherein n is a positive integer based on the polymerized intermediate to produce a highly water absorptive resin.