Continuous production method of water-absorbing composite
a production method and water-absorbing technology, applied in weaving, transportation and packaging, other chemical processes, etc., can solve the problems of increasing the cost of materials, destroying the water-absorbing property intrinsic to water-absorbing resin powder, and material bulkyness
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example 1
To 125 weight parts of an 80 wt % aqueous solution of acrylic acid, 57.3 weight parts of a 48.5% aqueous solution of sodium hydroxide, 6.4 weight parts of water, 0.15 weight parts of a crosslinking agent (N,N′-methylene-bisacrylamide) and 5.0 weight parts of a 30 wt % aqueous solution of hydrogenperoxide as an oxidizing agent were added to prepare solution “A”. The monomer concentration and the degree of neutralization of the solution “A” were 60 wt % and 50 molt, respectively.
Separately to 125 weight parts of an 80 wt % aqueous solution of acrylic acid, 57.3 weight parts of a 48.5% aqueous solution of sodium hydroxide, 9.9 weight parts of water, 0.15 weight parts of a crosslinking agent (N,N′-methylene-bisacrylamide) and 1.5 weight parts of L-ascorbic acid as a reducing agent were added to prepare solution “B” The monomer concentration and the degree of neutralization of the solution “B” were same as those for solution “A”.
Solutions “A” and “B” were respectively heated to 40° ...
example 2
Process steps up to the complexation step were conducted similarly to those in Example 1, to thereby obtain a substrate having immobilized thereon the water-absorbing polymer (composite) with a water content of 20 wt %.
Such composite was then sprayed with a 0.5 wt % ethanol solution of ethyleneglycol diglycidyl ether (EGDGE) so as to attain an amount of EGDGE of 3,000 weight ppm relative to the immobilized polymer (on the dry polymer basis). The composite sprayed with the ethanol solution of EGDGE was sent to a vent band-type drier equipped with a steam supplier, and was further blown at right angles with steam set at a temperature of 130° C. and a dew point of 120° C., where the contact of the composite with the steam was effected for 2 minutes at a linear velocity of 0.5 m / second. Thus the water-absorbing composite was completed. The polymer immobilized on the composite was found to have a water content of 5% and to be immobilized in an amount of 200 g / m2.
example 3
To 125 weight parts of an 80 wt % aqueous solution of acrylic acid, 57.3 weight parts of a 48.5% aqueous solution of sodium hydroxide, 68.8 weight parts of water, 0.15 weight parts of a crosslinking agent (N,N′-methylene-bisacrylamide) and 5.0 weight parts of a 30 wt % aqueous solution of hydrogen peroxide as an oxidizing agent were added to prepare solution “A”. The monomer concentration and the degree of neutralization of the solution “A” were 45 wt % and 50 mol %, respectively.
Separately to 125 weight parts of an 80 wt % aqueous solution of acrylic acid, 57.3 weight parts of a 48.5% aqueous solution of sodium hydroxide, 72.5 weight parts of water, 0.15 weight parts of a crosslinking agent (N,N′-methylene-bisacrylamide) and 1.5 weight parts of L-ascorbic acid as a reducing agent were added to prepare solution “B”. The monomer concentration and the degree of neutralization of the solution “B” were same as those for solution “A”.
Solutions “A” and “B” were respectively heated to...
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