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Materials that shrink in one dimension and expand in another

A dimensional, substrate technology, applied in the field of absorbent and shrinkable materials, which can solve the problems of poor mechanical properties, poor stretch and notch resistance, no drying/dehydration of the composition disclosed

Active Publication Date: 2021-10-22
KIMBERLY-CLARK WORLDWIDE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional hydrogels have poor mechanical properties, poor stretchability and notch resistance
[0005] Additionally, U.S. Patent Application Publication No. 2015 / 038613 to Sun et al. describes a hydrogel composition, but does not disclose drying / dehydrating such a composition under stress

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0037] Materials and Procedures

[0038] 1. Preparation of double network hydrogel. In a vial, dissolve 1.7 g of acrylamide and 0.3 g of sodium alginate in 12 ml of water. Then 1 mg N,N'-methylenebisacrylamide (MBAA) and 17 mg ammonium persulfate were added. In a second vial, dissolve 4.2 mg of tetramethylethylenediamine in 1 ml of water and mix with 40 mg of calcium sulfate. Both solutions were degassed under vacuum for half an hour. The two solutions are then mixed and poured into a Petri dish. The petri dish was covered with a piece of glass and placed under a handheld UV lamp for two hours to form and cure the hydrogel. The hydrogel is elastic and can be easily stretched to 20 times its original length without breaking. Stretching and relaxation can be repeated more than 20 times.

[0039] 2. Preparation of water-triggered shrinkable threads. Cut the hydrogel sheet prepared in preparation step 1 into small wires. Stretch the thread to about 6 times its original len...

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PUM

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Abstract

A substrate comprising a dual network polymer system comprising a crosslinked, covalently bonded polymer and a reversible, partially ionically bonded polymer, wherein the moisture content of the substrate is is less than or equal to 15% of the total weight of the substrate, and wherein the substrate includes latent retractive forces. A method for fabricating a substrate comprising: preparing a double network hydrogel comprising a cross-linked, covalently bonded polymer and a reversible, ionically bonded polymer; hydraulically coagulating the double network by force elongating the glue in at least one direction; dehydrating the double network hydrogel while still elongated to form a substantially dehydrated double network polymer system; and releasing the force to produce the substrate.

Description

Background technique [0001] The present disclosure relates generally to absorbent and shrinkable materials. In particular, the present disclosure relates to materials that contract in one dimension and expand in another when absorbing liquids, such as water or bodily fluids. [0002] Responsive materials that address the many unmet consumer needs associated with existing products are needed. New applications of these responsive materials could also stimulate the exploration and development of emerging products beyond current categories. [0003] Related materials may include shrinkable fibers; however, they are not hydrogels, they do not shrink to the same magnitude, and they do not have elastic properties. Previous attempts to produce responsive materials include materials such as those described in US Patent No. 4,942,089 to Genba et al. relating to shrinkage fibers, water-absorbent shrinkable yarns, and other similar materials. For example, by spinning, drawing and heat-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61L15/24A61L27/16A61L27/20A61L27/52A61F13/15
CPCA61F13/53A61L27/16A61L27/20A61L27/52A61L15/24A61F2013/530437A61L15/28C08J3/075C08J3/243C08J2333/26C08J2405/04C08J5/18B29C61/003B29C61/0608C08L33/26C08L5/04A61F13/5376A61L15/42A61L15/60A61F13/15B29C55/005A61L15/22
Inventor 宋旭东
Owner KIMBERLY-CLARK WORLDWIDE INC