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Polyamine-coated superabsorbent polymers

A superabsorbent, polymer technology for absorbent pads, coatings, bandages, etc. that addresses adverse effects, difficulty in improvement, etc.

Inactive Publication Date: 2008-01-23
BASF SE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] However, because the absorption and permeability properties of SAP particles are in conflict, it is difficult to improve one of these properties without adversely affecting the other

Method used

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  • Polyamine-coated superabsorbent polymers
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  • Polyamine-coated superabsorbent polymers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0104] base polymer 1) : CRC=30g / g, particle size distribution: 106-850μm (>850μm particle amount: 0.2%)

[0105] With coating solution 1: 3g CATIOFAST 2) VHF (polyvinylamine, 22% solids) and 2 g propylene glycol were used to coat the base polymer (40 g), followed by coating solution 2: 0.8 g deionized water, 0.8 g propylene glycol, aluminum sulfate solution (27% solids) as listed in the table below ) and 0.08g ethylene glycol diglycidyl ether (EGDGE) coating. The resulting base polymer particles were then heated in a laboratory oven at 150°C for 60 minutes to provide SAP particles of the invention.

[0106] Aluminum sulfate

the solution

CRC(g / g)

AUL0.9psi

(g / g)

0.3psiGBP

(Darcy)

>850μm

0g 3)

24.7

16.6

6

16.7％

2.2g

23.5

17.8

19

2.1％

3.1g

22.5

16.4

24

1.2％

[0107] 1) The raw material poly...

Embodiment 2

[0111] base polymer 4) : CRC=33g / g, pH=6.0, DN=74mol%, particle size distribution: 106-850μm (>850μm particle amount: 0.3%)

[0112] With coating solution 1: 3g CATIOFAST  VHF (polyvinylamine, 22% solids) and 2 g propylene glycol were used to coat the base polymer (40 g), followed by coating solution 2: 0.4 g deionized water, 0.8 g propylene glycol, sodium phosphate solution (12 g in water) as listed below % solids) and 0.12 g EGDGE coating. The resulting base polymer particles were cured in a laboratory oven at 150°C for 60 minutes to provide the SAP particles of the present invention.

[0113] sodium phosphate

the solution

CRC(g / g)

AUL0.9psi

(g / g)

0.3psiGBP

(Darcy)

>850μm

0g 3)

26.3

18.6

3

18.5％

2.0g

25.9

17.9

8

3.4％

4.2g

25.6

17.2

10

1.6％

[0114] 4) Sodium polyacrylate

[0115] Ex...

Embodiment 3

[0117] Poly(sodium acrylate) superabsorbent particles (100 parts) with CRC=25.5 g / g and DN=74% were mixed with 7.5 parts containing 26.7% water, 25.7% propylene glycol in a Lödige M5 mixer operating at 300 rpm , 44.9% alum solution F (27% aluminum sulfate) and 1.7% EGDGE solution. The resulting granules were dried at 130° C. for 1 hour. These granules were further treated with 8 parts of a solution containing 62.3% ultrafiltered 50K polyvinylamine (27 wt% PVAm), 37.4% propylene glycol and 0.25% EGDGE in a Lödige M5 mixer operating at 300 rpm. The resulting granules were again dried at 130°C for 1 hour to provide SAP granules with CRC = 20.6 g / g and 0.3 GBP = 9.2 Darcy.

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Abstract

Polyamine-coated superabsorbent polymer particles having a reduced tendency to agglomerate and having improved permeability properties are dis not closed. A method of producing the polyamine coating using an ionic crosslinker also is disclosed.

Description

technical field [0001] The present invention relates to polyamine-coated superabsorbent polymer particles having a reduced tendency to agglomerate and improved permeability properties. The invention also relates to a process for the production of polyamine-coated superabsorbent polymer particles from starting superabsorbent polymer particles, polyamines and salts with polyvalent metal cations and / or polyvalent anions. Polyamine-coated particles exhibit excellent gel bed permeability without substantially detrimental effect on absorbent performance. The present invention also relates to the use of polyamine-coated superabsorbent polymer particles in articles such as diapers, catamenial products and wound dressings. Background of the invention [0002] Water-absorbing resin is widely used in cleaning products, sanitary products, rags, water-retaining agents, dehydrating agents, sludge coagulants, disposable towels and bathroom non-slip mats, disposable doormats, thickeners, d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61L15/60C08J3/24C09D139/02
CPCC08L39/02C08L33/02C08J3/245C08J3/12A61L15/60C08J2300/14C08J3/126C08J2323/02C08J2477/00
Inventor N·赫费特M-I·K·米亚图迪拉M·A·米切利
Owner BASF SE
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