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Manufacturing method of superabsorbent resin

A technology of superabsorbent resin and manufacturing method, which is applied in the field of manufacturing superabsorbent resin, and can solve the problems of low pressure absorption, gel clogging, and inability to meet the application of hygienic products, etc.

Active Publication Date: 2021-05-07
SHANGHAI HUAYI NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It mentioned that superabsorbent resins that have not undergone surface cross-linking post-treatment cannot be directly applied to feminine hygiene products and baby diapers, because the resin particles are easy to connect into groups after contacting liquid, causing gel blockage and hindering the further penetration of water molecules. However, resin particles have poor gel strength and low pressure absorption, which cannot meet the needs of sanitary products.

Method used

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  • Manufacturing method of superabsorbent resin
  • Manufacturing method of superabsorbent resin
  • Manufacturing method of superabsorbent resin

Examples

Experimental program
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preparation example Construction

[0025] The step of preparing water-absorbent resin powder as an intermediate base material suitable for the method of the present invention is not particularly limited, and can be a conventional method in the field, for example, the method for preparing water-absorbent resin powder as an intermediate base material disclosed in Chinese patent CN105848776A (This Chinese patent is inserted herein as a part of the present invention by way of citation).

[0026] In an example of the present invention, the step of described preparation intermediate base comprises:

[0027] - adding and mixing an acrylic monomer, an internal crosslinking agent, an aqueous solution of a chelating agent, an aqueous alkali solution, and water in a reaction vessel, thereby preparing a solution (A);

[0028] - Access N 2 Then add a polymerization initiator to carry out polymerization to obtain a water-containing gel-like cross-linked polymer;

[0029] - Disintegrating the obtained hydrogel-like cross-li...

Embodiment

[0071] Test Methods

[0072] "ENANA" is the abbreviation of European Nonwoven Industry Association. "ERT" is the abbreviation of the European Standard for the determination of superabsorbent resin. In the present invention, unless otherwise specified, the physical properties of the superabsorbent resin are measured in accordance with the original ERT (2002 revised edition / commonly known literature).

[0073] (1) Centrifugal water retention capacity (CRC)

[0074] The centrifugal water retention capacity (CRC) of the superabsorbent resin is measured according to the EDANA method (ERT441.2-02).

[0075]Specifically, 0.2 g of superabsorbent resin is evenly placed in a tea bag (60mm×85mm) and heat-sealed, and then soaked in a large amount (usually about 500ml) of 0.90wt at 23 (±2)°C. % NaCl aqueous solution. After 30 minutes, lift the bag, use a centrifuge (manufactured by Kokusan Co., Ltd., Japan, model H-122), remove water for 3 minutes with a centrifugal force of 250G, an...

manufacture example 1

[0094] In a stainless steel container with a volume of 20 L, 5 kg of acrylic acid, 4345 g of deionized water and 4159 g of 50 wt % NaOH aqueous solution were put into the container, and the feeding speed of the NaOH solution was 832 g / min. During the dosing process of NaOH solution, precipitates can be observed, but gradually dissolve to form a transparent and uniform solution. When the dropwise addition was completed, the temperature of the neutralized liquid rose to 91° C. due to the heat of neutralization. Subsequently, adding 686 g of polyethylene glycol 400 diacrylate (Taiwan Changxing Materials Co., Ltd.) as a 4% internal cross-linking agent, a concentration of 5 wt% pentasodium diethyltriaminepentaacetic acid aqueous solution (BASF ) 14g, and under the effect of the circulating water bath of the vessel jacket, the temperature of the reaction solution was reduced to 88°C.

[0095] The reaction solution is pumped out through the stainless steel pipeline at a speed of 473...

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Abstract

A method for producing a superabsorbent resin is disclosed. The method comprises the following steps: (i) providing acrylic acid and an internal crosslinking agent, and forming water-absorbing resin powder as an intermediate base material after polymerization; (ii) adding 0.1 to 5 wt% of SiO according to the weight of the intermediate base material 2 particles, and to determine the intermediate base material with SiO 2 The water absorption capacity under 2kPa pressure (BAAP) of the particle mixture; and (iii) if the measured BAAP is less than 18g / g, then stop the subsequent process; if the BAAP is 18g / g or more, then perform the following steps (iv); (iv ) In the intermediate base material, a surface crosslinking agent is added to obtain surface crosslinked superabsorbent resin particles after heating and reacting.

Description

technical field [0001] The invention relates to a method for manufacturing a superabsorbent resin. The manufacturing method of the invention can control the quality of the superabsorbent resin product on-line and improve the yield. Background technique [0002] Super Absorbent Polymer (SAP, Super Absorbent Polymer) is a polymer gelling agent that swells in water but is insoluble in water. It can absorb aqueous solutions that are several times or even hundreds of times its own weight. Based on this property, its It is widely used in various applications such as sanitary products such as diapers, sanitary napkins, and incontinence pads, as well as water-retaining agents for farms and industrial water-repelling agents. [0003] In most cases, these superabsorbent resins have been widely used in the field of hygienic materials such as diapers or sanitary napkins. For these applications, it should exhibit high water absorption, it should not release absorbed water even under ext...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F220/06C08K3/36
Inventor 华水波施幸浩成启刚庄岩林锋朱晓亮
Owner SHANGHAI HUAYI NEW MATERIAL
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