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Water-absorbing agent and production method thereof

一种吸水剂、吸水树脂的技术，应用在化学仪器和方法、吸收垫、其他化学过程等方向，能够解决无负载吸收率和负载吸收率下降、不可能液体渗透性和扩散性、金属成分不均匀附着等问题

Inactive Publication Date: 2007-05-16
NIPPON SHOKUBAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Thus, it will not be possible to sufficiently increase the permeability and diffusivity of the liquid in order to achieve the amount of metal component added
In addition, the penetration of the metal component into the water-absorbent resin will reduce the no-load absorption rate and load absorption rate, and with these technologies, the metal component is planarly and unevenly attached to the surface of the water-absorbent resin, resulting in uniformity. question

Method used

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  • Water-absorbing agent and production method thereof

Examples

Experimental program
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Effect test

Embodiment

[0092] The content of the present invention will be described more specifically below, but the present invention is not limited thereto. For convenience, "parts by mass" is abbreviated as "parts" and "liter" is abbreviated as "L".

[0093] The properties of the water-absorbent resin particles or the water-absorbing agent can be tested according to the following methods. In addition, unless otherwise specified, all operations are performed at room temperature (20-25°C) and 50RH% humidity.

[0094] When the water-absorbing agent is used in a final product such as a hygienic material, the water-absorbing agent absorbs moisture, and if necessary, the water-absorbing agent is separated from the final product, dried at a low pressure and low temperature (for example, 1mmHg or less, 60°C, 12 hours) before drying Measure its performance. In addition, the water content of each of the water-absorbing agents used in the examples and comparative examples of the present invention was to ...

preparation Embodiment 1

[0156] 505.6g acrylic acid, 4430.8g 37wt% sodium acrylate aqueous solution, 497.0g pure water and 12.79g polyethylene glycol diacrylate (molecular weight 523) are dissolved in the reactor and make reaction solution, and used reactor is the stainless steel double arm with cover Kneader, with a volume of 10 liters, has two Σ-shaped blades and a jacket. The reaction solution was degassed for 20 minutes under nitrogen atmosphere. Subsequently, 29.43 g of 10 wt % sodium persulfate and 24.45 g of 0.1 wt % L-ascorbic acid aqueous solution were added to the reaction solution while stirring. Polymerization started after about 1 minute. During the polymerization, the reactor was maintained at 20-95°C while the gel produced was pulverized. Thirty minutes after the start of the polymerization reaction, the cross-linked hydrogel polymer was removed from the reactor. The resulting cross-linked hydrogel polymer was crushed to a diameter of approximately 5 mm.

[0157] The pulverized cros...

Embodiment 1

[0161] 0.02 parts by mass of 90% lactic acid (manufactured by Musashino Chemical Laboratory Co., Ltd.) was mixed with 2 parts by mass of a 27 wt% aqueous aluminum sulfate solution for tap water (manufactured by ASADAKAGAKU KOGYO KABUSHIKIKAISHA) to obtain a transparent, uniform solution.

[0162] 2.02 parts by mass of the aqueous solution were uniformly mixed with 100 parts by mass of the water-absorbent resin particles (A), and dried at 60° C. for 1 hour. The dried matter was pulverized so as to pass through a JIS standard sieve (mesh opening 600 μm). Then the particles were subjected to the paint shaker test 2 to obtain the water-absorbing agent (1).

[0163] Table 1 lists the properties of the water absorbing agent (1).

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Abstract

The invention provides a water absorbing agent and a method for producing the same. The water absorbing agent comprises (i) water absorbent resin particles having an internal cross-linked structure obtained by polymerizing a water-soluble unsaturated monomer, (ii) organic acid (salt), and (iii) water-soluble multivalent metal salt Thereby it is possible for the water absorbing agent of the invention to suppresse permeation of metal components into the water absorbent resin particles and enable the metal components to evenly adhere to an entire surface of the water absorbent resin in a dot manner.

Description

technical field [0001] The present invention relates to (i) a water-absorbing agent for sanitary materials such as disposable diapers, sanitary napkins and so-called incontinence pads, and (ii) a method for preparing the water-absorbing agent. Background technique [0002] The main components of the absorbent core include hydrophilic fibers such as pulp and water-absorbent resin. Absorbent cores are widely used in sanitary materials such as disposable diapers, sanitary napkins and incontinence pads, and their main function is to absorb body fluids. [0003] In recent years, for hygienic materials such as sanitary napkins, the development of high performance and thinning has gradually increased the amount of water-absorbent resin used in various hygienic materials. For the entire absorbent core composed of water-absorbent resin and hydrophilic fibers , the proportion of water-absorbent resin also tends to increase. By (i) reducing the amount of hydrophilic fibers with low b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/00A61L15/60C08L33/00B01J20/26
CPCC08J3/245C08J2300/14A61L15/60C08L33/00A61L15/16C08J3/00
Inventor 中村将敏三宅浩司柴田浩史
Owner NIPPON SHOKUBAI CO LTD
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