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Superabsorbent polymer composite comprising a superabsorbent polymer and cellulosic nanofibrils

A technology of superabsorbent polymer and cellulose fibrils, which can be used in absorbent pads, drug delivery, medical science, etc., and can solve the problems of lack of elasticity and easy breaking.

Active Publication Date: 2011-11-16
ESSITY HYGIENE & HEALTH AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Foams made from traditional superabsorbent polymers such as polyacrylic acid / polyacrylate polymers are typically hard and brittle when dry, and inelastic when wet – tend to crumble under pressure

Method used

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  • Superabsorbent polymer composite comprising a superabsorbent polymer and cellulosic nanofibrils
  • Superabsorbent polymer composite comprising a superabsorbent polymer and cellulosic nanofibrils
  • Superabsorbent polymer composite comprising a superabsorbent polymer and cellulosic nanofibrils

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0164] Example 1 - Sample S1: 0 wt% nanofibrils, comparative example (high degree of crosslinking)

[0165] Place a cooling bath (cold water + ice) on top of a magnetic stirrer. 5.24g NaOH (67% acid neutralized) was dissolved in 17.009g Ultra Pure Elga water. A bottle was charged with 13.255g Ultra Pure Elga water, 13.8g acrylic acid monomer (0.192 moles) and placed in a cooling tank. After mixing for 10 minutes, NaOH solution was added dropwise to the bottle. The bottle was placed in a water tank pre-set to 42°C and 0.242 g of crosslinker MBA (0.85 mole % per mole of monomer) was added, stirring speed was increased to ensure that the powder was added to the solution. After 10 minutes, initiator VA-044 (0.1 mole % of monomer, 0.059 g) was added by syringe as a 10% solution in Ultra Pure Elga water. The temperature of the tank was raised to 50°C and the reaction was allowed to proceed at 50°C. Ten minutes after the network had formed, the bottle was sealed, the heat source wa...

Embodiment 2

[0166] Example 2 - Sample S2: 12% by weight fibrils per weight of acrylic monomer (low degree of crosslinking)

[0167] To increase the concentration of nanofibrils in the solution, a certain amount of nanofibril solution (1.5% in deionized water) was filtered to remove part of the water. The nanofibrils will still be wet after this step and contain water.

[0168] 17.863 g of the nanofibril solution (0.62 g of nanofibrils) was charged to the E flask, and the flask was then placed in a cold water bath. 3.705 g NaOH (67% acid neutralized) was added to flask E in small increments and the solution was mixed until all NaOH particles were dissolved.

[0169] Place a sink of cold water (cold water + ice) on top of a magnetic stirrer. The nanofiber-NaOH solution was transferred into a bottle, then 19.5 g of the nanofibril solution (0.60 g of nanofibrils) was added and the bottle was placed in a sink of cold water. The solution was mixed for approximately 15 minutes, after which 10...

Embodiment 3

[0171] Example 3 - Sample S3: 0% by weight nanofibrils per weight of acrylic monomer, comparative example (low degree of crosslinking)

[0172] Place a sink of cold water (cold water + ice) on top of a magnetic stirrer. The bottle was filled with 25.53g Ultra Pure Elga water, 1Og acrylic acid monomer (0.139 moles) and placed in a cooling tank. 14.98 g of NaOH solution (25% solution in Ultra Pure Elga water, 67% neutralized acid groups) was added dropwise to the bottle.

[0173] The bottle was placed in a water tank pre-set to 42°C and 0.089 g of crosslinker MBA (0.42 mole % per mole of monomer) was added, stirring speed was increased to ensure that the powder was added to the solution. After 10 minutes, initiator VA-044 (0.1 mole % per mole of monomer, 0.045 g) was added by syringe as a 10% solution in Ultra Pure Elga water. The temperature of the tank was raised to 50°C and the reaction was allowed to proceed at 50°C. Ten minutes after the network had formed, the vial was ...

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Abstract

The invention provides a superabsorbent polymer composite comprising superabsorbent polymers and cellulosic nanofibrils having a diameter equal to or less than 100nm. The composite may be in the form of particles or a foam. Methods for producing the composite and absorbent articles comprising the superabsorbent polymer composite are also provided.

Description

technical field [0001] The present invention relates to a superabsorbent polymer composite comprising a superabsorbent polymer and cellulose nanofibrils. The present invention also relates to a process for producing a superabsorbent polymer composite according to the invention and an absorbent article comprising the superabsorbent polymer composite. Background technique [0002] Technological advances in absorbent articles have stimulated research into absorbent (often superabsorbent) materials with desirable properties such as high absorbency, high storage capacity and high gel and mechanical strength. [0003] The absorbent material may comprise two or more layers, eg a liquid acquisition layer, a storage layer and a distribution layer. [0004] In order to obtain a good liquid acquisition capacity it is important that the absorbent material has a high instantaneous liquid acquisition capacity. Open, bulky structures with large capillaries have a high instantaneous liqui...

Claims

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Application Information

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IPC IPC(8): A61L15/60
CPCA61L15/60A61L15/28A61L2400/12C08L1/02
Inventor R・比蒂斯S・阿巴K・马尔姆格伦M・拉松A・拉松
Owner ESSITY HYGIENE & HEALTH AB
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