Superabsorbent cellulosic fiber

A technology of cellulose fiber and cellulose sulfate, applied in cellulose pulp post-treatment, absorbent pads, fiber treatment, etc., can solve the problems of expensive, difficult to process superabsorbent fibers, and ineffectiveness

Inactive Publication Date: 2003-02-05
WEYERHAEUSER CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these superabsorbent fibers are difficult to process compared to fluff pulp fibers, and they do not bend as well as fluff pulp fibers
Additionally, and importantly, synthetic

Method used

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  • Superabsorbent cellulosic fiber
  • Superabsorbent cellulosic fiber
  • Superabsorbent cellulosic fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] Embodiment 1 prepares sulfated cellulose fiber

[0081] In this example, a representative method for preparing sulfated fibers is described.

[0082] Before sulfation, the pulp was activated with acetic acid. 10 g of fiberized bleached kraft pulped southern yellow pine fluff pulp (NB416, Weilhauser Company, Federal Way, WA), which had been oven dried at 105°C, was added to 600 mL of glacial acetic acid. Then, the pulp / acid slurry is placed in a vacuum box and the air is removed. The slurry was placed under vacuum for 30 minutes, then the vacuum box was repressurized to atmospheric pressure. The slurry was left at ambient conditions for 45 minutes, then again under vacuum for 30 minutes. After the second exposure to vacuum, the slurry was again placed at atmospheric pressure for 45 minutes. The slurry was then poured into a Buchner funnel where the pulp was collected and pressed until the residual acetic acid weight was twice the weight of the dried pulp (ie, the tot...

Embodiment 2

[0087] Example 2 Preparation of representative crosslinked sulfated cellulose fibers

[0088] In this example, a representative method for preparing crosslinked sulfated cellulose fibers is described. Cellulose sulfate fibers prepared as described in Example 1 were crosslinked with typical crosslinking agents.

[0089] A catalyzed urea-formaldehyde system was used to crosslink sulfated cellulose fibers. The catalyst included magnesium chloride and sodium dodecylbenzenesulfonate in 88% ethanol / water. In addition to its primary function, the catalyst solution also acts as a diluent for the crosslinker. The crosslinker was obtained by dissolving urea in 37% (w / w) aqueous formaldehyde. A crosslinking agent is combined with a catalyst solution and applied to the sulfated fibers. The treated fibers were then cured by placing in an oven at 105°C for 60 minutes.

[0090] In the experiments, different amounts of crosslinking agent were applied to the fibers. The consumption of th...

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PUM

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Abstract

The present invention describes a modified cellulosic fiber having superabsorbent properties. The modified fiber of the invention has a fibrous structure substantially identical to the cellulosic fiber from which it is derived. The modified fiber is a water-swellable, water-insoluble fiber that substantially retains its fibrous structure in its expanded, water-swelled state. The modified fiber is a sulfated and crosslinked cellulosic fiber having a liquid absorption capacity of at least about 4 g/g. In one embodiment, the modified fiber is an individual, crosslinked, sulfated cellulosic fiber. In another aspect, the invention provides a rollgood that includes the modified fiber, absorbent composites and articles that include the modified fiber, and methods for making the modified cellulosic fiber.

Description

field of invention [0001] The present invention relates to superabsorbent modified cellulosic fibers, and more particularly, to crosslinked and sulfated cellulosic fibers having substantially the same structure as the cellulosic fibers from which the modified fibers are derived. Background of the invention [0002] Absorbent products for personal care, such as baby diapers, adult incontinence pads and feminine care products, typically comprise an absorbent core comprising superabsorbent material in a fibrous matrix. Superabsorbent materials are water-swellable, generally water-insoluble absorbent materials that have a liquid absorption capacity of at least about 10 times, preferably about 20 times, and often up to about 100 times their weight in water. Although the ability of the absorbent core to retain or store liquid is largely attributable to the superabsorbent material, the fibrous matrix of the absorbent core provides the basic functions of liquid capillarity, pad stre...

Claims

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Application Information

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IPC IPC(8): A61F13/53A61F5/44A61F13/49A61L15/00A61L15/28A61L15/60C08B5/14C08B15/00D06M11/00D06M11/55D06M15/423D06M101/06
CPCA61L15/28C08B5/14C08B15/005
Inventor 阿马尔・N・内奥吉大理查德・H・扬布伦特・A・彼得森
Owner WEYERHAEUSER CO
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