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Superabsorbent polymer and its production method

A superabsorbent, polymer technology, used in absorbent pads, bandages, medical science, etc., can solve the problems of reduced absorption, insufficient absorption rate of diapers, etc., to achieve excellent absorption performance, improve absorption rate and liquid permeability Effect

Active Publication Date: 2021-11-12
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned method can achieve high absorption performance, but it is not enough to obtain the absorption rate at the level required for diapers in recent years
[0009] As another example, International Application PCT-JP2011-058829 has attempted to achieve a high absorption rate by adjusting the gel grinding energy, but in this case, there are disadvantages such as reduced absorbency under pressure or without pressure

Method used

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  • Superabsorbent polymer and its production method
  • Superabsorbent polymer and its production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0104] As a manufacturing apparatus for superabsorbent polymers, a continuous process including a polymerization step, a hydrogel pulverization step, a drying step, a pulverization step, a classification step, a surface crosslinking step, a cooling step, a classification step, and a transportation step connecting the respective steps can be used. manufacturing device.

[0105] (step 1)

[0106] 100 parts by weight of acrylic acid, 0.7 parts by weight (7000ppm) of polyethylene glycol diacrylate (weight average molecular weight: about 500g / mol) as an internal crosslinking agent, 0.015 parts by weight (150ppm) of allylmethyl Acrylate and 0.01 parts by weight of IRGACURE 819 as a photoinitiator were mixed to prepare a monomer solution. Subsequently, while the monomer solution was continuously supplied by a metering pump, 160 parts by weight of a 24% by weight aqueous sodium hydroxide solution was continuously subjected to line mixing to prepare an aqueous monomer solution. At th...

Embodiment 2 to 8 and comparative example 1 to 4

[0116] The superabsorbent polymer was prepared in the same manner as in Example 1, except that the content range of the internal crosslinking agent, the pore diameter of the orifice plate set in the gel pulverizer, the thickness of the hydrogel were changed as shown in Table 1 below. Water content and input ratio of fine powder regranulate.

[0117] In the following Examples 1 to 8 and Comparative Examples 1 to 4, the gel strength before and after gel pulverization of the hydrogel was measured by the method summarized below, and the measurement results were summarized and shown in the following Table 1 together. .

[0118] *Measurement method of gel strength of hydrogel

[0119] A. Preparation of the sample to be measured:

[0120] First, hydrogel samples to be measured (a hydrogel sheet before gel pulverization and a hydrogel after gel pulverization) were prepared to have a diameter of about 2.5 cm and a thickness of about 2 mm to 5 mm. Load the prepared sample on a microb...

experiment example

[0130] The physical properties of the superabsorbent polymers prepared in Examples and Comparative Examples were measured and evaluated by the following methods.

[0131] (1) Centrifuge retention capacity (CRC)

[0132] For the superabsorbent polymers of Examples and Comparative Examples, it was measured by water absorption capacity under no-load conditions according to the test method No. WSP 241.3 recommended by EDANA (European Disposables and Nonwovens Association, European Disposables and Nonwovens Association) Centrifuge retention capacity (CRC). Will W 0 (g, about 0.2 g) of superabsorbent polymer was uniformly put into a bag made of nonwoven fabric, and then sealed. Then, the bag was immersed in a physiological saline solution consisting of a 0.9% by weight sodium chloride aqueous solution at room temperature. After 30 minutes, water was removed from the bag by centrifugation at 250G for 3 minutes, and the weight of the bag was measured W 2 (g). Furthermore, the sam...

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Abstract

The present invention relates to a superabsorbent polymer exhibiting more improved absorption rate and liquid permeability and having excellent basic absorption properties and a production method thereof. A superabsorbent polymer comprising a base polymer powder and a surface cross-linked layer, wherein the superabsorbent polymer has a fixed height absorption FHA (20cm) of 22.5 g / g to 29 g / g to 0.9 wt % sodium chloride aqueous solution , 35(·10 ‑7 cm 3 s / g) or greater in saline flow conductivity SFC to 0.685% by weight aqueous sodium chloride solution, and T-20 of 180 seconds or less.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims priority and benefit from Korean Patent Application No. 10-2016-0178407 filed with the Korean Intellectual Property Office on December 23, 2016, the disclosure of which is incorporated herein by reference in its entirety. [0003] The present invention relates to a superabsorbent polymer exhibiting more improved absorption rate and liquid permeability and having excellent basic absorption properties and a production method thereof. Background technique [0004] Super Absorbent Polymer (SAP) is a synthetic polymer material capable of absorbing about 500 times to about 1000 times its own weight of water, and various manufacturers name it different names, such as SAM (Super Absorbency Material , superabsorbent material), AGM (Absorbent Gel Material, absorbent gel material), etc. Such superabsorbent polymers began to be practically used in sanitary products, and now they are widel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/24C08L33/06C08J3/12C08J3/075C08F2/44C08K5/11
CPCC08J3/242C08J3/247C08F283/065A61L15/24A61L15/60C08J2351/08C08F220/06C08F220/40C08L51/08C08J3/075C08J3/12C08F2/44C08J3/245C08K5/11C08L33/06C08J2333/02B01J20/267B01J2220/68C08F4/40C08F2/50C08F4/34C08F6/008C08L33/08C08J2300/14C08J2207/12B01J20/3021B01J20/3085C08J2333/10
Inventor 安泰彬金东贤金娟洙李玹燮韩章善李明汉
Owner LG CHEM LTD
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