Damage-resistant superabsorbent materials

一种高吸水性材料、亲水性的技术，应用在吸收垫、医药科学、绷带等方向，能够解决微粒损伤增加等问题

Active Publication Date: 2006-09-20
KIMBERLY-CLARK WORLDWIDE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This particulate damage is further increased in products with high levels of superabsorbent material as product manufacturers strive for thinner products

Method used

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  • Damage-resistant superabsorbent materials
  • Damage-resistant superabsorbent materials
  • Damage-resistant superabsorbent materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] This example illustrates the changes in superabsorbent properties and superabsorbent material average particle size that occur as a result of processing on a diaper production line. Table 1 summarizes these changes. Fresh materials are materials in the condition in which they are received from the manufacturer of the superabsorbent material prior to incorporation into absorbent articles. Recycled materials are materials in the condition in which they are found after incorporation into commercially available absorbent articles. Recovered superabsorbent material is obtained by separating superabsorbent from the fluff of the diaper absorbent core using pulsed air turbulence and rubber beaters at low or moderate speeds.

[0043] The superabsorbents tested were two different lots of fresh SXM 9543, available from Stockhausen, Greensboro, NC, USA; and fresh Dow DRYTECH 2035, available from Dow Chemical, Midland, MI, USA. Corresponding recycled superabsorbent materials were ...

Embodiment 2

[0050] To develop an absorbent composite that simulates the extent of damage to superabsorbent materials in a commercial diaper production line, especially the mean PSD and its reduction, while producing a sample size large enough to manufacture small-scale diaper use trials. Bench method using an OSTERIZER(R) 12 speed commercial blender available from Sunbeam Products, Boca Raton, FL, USA.

[0051] Each time 50 g of raw ("fresh") granular superabsorbent obtained from a distributor or later modified / treated as described herein was added to the blender and, while blending, The blender was set at combinations of "high speed" and "blending" settings while the blender was run for different amounts of time (15 seconds, 30 seconds, and 60 seconds). The length of blending time was used to correspond to the level of damage, with longer times representing more severe damage. Table 2 lists the data supporting this hypothesis. Based on the data in Table 2, the 30 second blending method...

Embodiment 3

[0055] Three types of commercial superabsorbents, SXM9543 and FAVOR 880, both available from Stockhausen and Dow DRYTECH 2035, available from Dow Chemical, were damaged using the 30-second blending method described in Example 2, respectively, to determine Its properties are listed in Table 3. All three commercial superabsorbents can be damaged by mechanical shock and stress. Samples labeled "Fresh" in Table 3 were not subjected to this blending process. Samples labeled "Blended" were blended for 30 seconds as described above. Samples with a particle size of 300-600 μm exhibited a GBP reduction of about 30% or greater at 0 psi and a GBP reduction of about 60% or greater at 0.3 psi, while pristine microparticles exhibited a GBP loss of about 50% or greater at 0 psi above and a GBP loss of about 95% or more at 0.3 psi and an average particle size reduction of about 25% or more compared to its fresh superabsorbent.

[0056] performance

SXM 9543 4

Dow 2035 2 ...

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Abstract

Superabsorbent material treated to resist damage when subjected to an Absorbent Product Processing Simulation Test, which simulates the mechanical damage that occurs during current commercial diaper manufacturing processes. The treated superabsorbent material has a centrifuge retention capacity of about 15 grams or greater of 0.9 weight percent sodium chloride per gram of the superabsorbent material and a gel bed permeability (GBP) at 0 psi swell pressure on pre-screened particles of about 200 (x 10<-9> cm<2>) or greater. After subjecting the treated superabsorbent material to the Absorbent Product Processing Simulation Test, the treated superabsorbent may exhibit minimal reduction in GBP of pre-screened or un-screened particles at 0 psi or at 0.3 psi swell pressure, as well as possibly exhibiting minimal reduction in average particle size diameter (PSD). The superabsorbent material can be treated by adding an aqueous solution of a hydrophilic soft polymer to the superabsorbent material, mixing the superabsorbent material with the aqueous solution, and drying the superabsorbent material.

Description

technical field [0001] The present invention relates to superabsorbent materials which can withstand mechanical forces without significantly reducing the absorption properties, especially the gel bed permeability and / or the average particle size. The invention also relates to a method of improving the scratch resistance of superabsorbent materials. Background technique [0002] Commercial superabsorbent materials are widely used in various personal care products such as baby diapers, children's toilet training pants, adult incontinence products, feminine care products, etc. These superabsorbent materials or hydrogels are essentially cross-linked polyelectrolytes, ie, water-swellable, water-insoluble, and exhibit very high water absorption. Generally, these crosslinked polyelectrolytes have a centrifuge retention capacity (CRC) of at least 15 g of 0.9 wt% aqueous NaCl / g polymer. Superabsorbent materials are also designed for rapid uptake of body fluids, which requires the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61L15/60A61F13/15
CPCA61L15/60A61F2013/530708A61F2013/530788A61F13/53
Inventor J·秦K·R·小许勒H·L·威廉D·A·慧伦斯
Owner KIMBERLY-CLARK WORLDWIDE INC
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