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Process for production of hydrogel particles and process for cutting of high-concentration hydrogel sheet

A technology of hydrogel particles and hydrogel sheets, which is applied in metal processing and other directions, can solve the problems of reduced manufacturing efficiency, difficulty in ensuring the thickness of cutting continuous sheets, and slow running speed

Active Publication Date: 2005-03-09
NIPPON SHOKUBAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order for the gel sheet (which may enter a state of close to 100°C immediately after manufacture) to cool sufficiently before being supplied to the cutting machine, the gel sheet must travel a long distance from its production unit to the cutting machine. machine, or add a cooling device during operation, or slow down the operation speed to ensure cooling time
Therefore, the cost of equipment increases, and manufacturing efficiency decreases
[0014] With regard to the cutting technique of the above-mentioned Patent Document 3, since the continuous sheet is cut as follows, it is cut with a plate-shaped rotating blade by entering the blade edge into the continuous sheet at the stroke in the roll pitch between the rollers. fragments, so it is difficult to ensure that the entire thickness of the continuous sheet is cut
In particular, it is very difficult to cut such highly concentrated hydrogel sheets if they are in the form of scattered thicknesses or undulating or fluctuating thicknesses

Method used

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  • Process for production of hydrogel particles and process for cutting of high-concentration hydrogel sheet
  • Process for production of hydrogel particles and process for cutting of high-concentration hydrogel sheet
  • Process for production of hydrogel particles and process for cutting of high-concentration hydrogel sheet

Examples

Experimental program
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Embodiment approach

[0177] Such as Figure 6 The illustrated embodiment of the invention differs from the above-described embodiments of the invention in the arrangement of the slitter 20 and the cutter 30 .

[0178] The continuous sheet 10 , which is slit longitudinally by means of passing through the slitter 20 , does not run vertically downwards as a result, but obliquely downwards. The conveyor 50 is provided on the downstream side of the slitter 20, and the conveying surface of the conveyor 50 is inclined downward. The conveying surface of the conveyor 50 is treated by, for example, a fluororesin process so as to reduce its degree of adhesion to the continuous sheet 10 .

[0179] The cutter 30 is disposed obliquely below the conveyor 50 on the downstream side thereof. The continuous sheet 10 is cut longitudinally by a cutting machine 30, and the resulting cut pieces 12 fall freely. As a result, they initially move obliquely downward due to the inertia of operation until they are separated...

Embodiment 1

[0192] :

[0193] The following solutions at predetermined flow rates were stirred and mixed together to prepare a monomer liquid.

[0194] 48.5% by weight aqueous sodium hydroxide solution 73.5g / s

[0195] 53.9% by weight aqueous acrylic acid solution 169.2g / s

[0196] By dissolving 77.4 parts by weight of 50% by weight aqueous acrylic acid solution, 0.781 parts by weight of 2-hydroxymethyl-2-methylphenyl ethyl ketone, and 0.849 parts by weight of 46% by weight aqueous pentasodium diethylenetriaminevaleric acid solution , and 21.0 parts by weight of polyethylene glycol diacrylate (average molecular weight: 523) were dissolved together to prepare a solution of 1.43 g / s.

[0197] The temperature of the resulting monomer liquid stabilized at about 95°C.

[0198] The monomer liquid is continuously supplied to the supply line and continuously stirred in the supply line, and then a 3% by weight aqueous sodium persulfate solution is fed into the monomer liquid at a flow rate of 3...

Embodiment 2

[0215] :

[0216] A continuous sheet composed of a hydrogel sheet manufactured by the same process as in Example 1 was supplied to the slitter using a conveyor belt.

[0217] The slitter used was the same press-cut slitter as in Example 1, except that both the press-cut slitter blade and the receiving roll were coated with fluororesin. In the same manner as in Example 1, the continuous sheet was laterally divided into four with a width of 20 cm.

[0218] The continuous sheet hanging vertically from the slitter is supplied to the cutting machine.

[0219] The structure of the cutting machine is basically the same as that of Embodiment 1, but its fixed blade and receiving roller are coated with fluororesin. The continuous sheet was continuously cut at intervals of 15 cm along the longitudinal direction of the continuous sheet at a rotation speed of the rotator of 30 rpm. Obtain a rectangular cut piece of almost 20cm x 15cm. It was observed that the continuous sheet did not s...

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Abstract

An object of the present invention is to make it possible that: a high-concentration hydrogel sheet, which is suitable for production of high-performance water-absorbent resin particles, is cut efficiently without involving the adhesion to such as cutting-blades; and the subsequent disintegration operation is also successfully carried out; and hydrogel particles excellent in the quality and performances are efficiently produced. As a means of achieving this object, the process according to the present invention for production of hydrogel particles is a process for production of the hydrogel particles 14 from a high-concentration hydrogel sheet 10 and comprises: a step (a) of cutting a continuous sheet 10 of a crosslinked high-concentration hydrogel polymer of 50 to 80 weight % in solid component concentration every 10 to 100 cm lengthwise of the continuous sheet 10 while running it lengthwise, thereby obtaining cut pieces 12; and a step (b) of continuously supplying the cut pieces 12 (obtained from the step (a)) to a continuous disintegrator 40 to continuously carry out disintegration and discharge under conditions where the supply amount of the cut pieces 12 and the disintegrating and discharging abilities of the continuous disintegrator 40 satisfy (supply amount) B29B 9 / 04 B29B 11 / 02 B26D 1 / 38 4 34 2 2004 / 9 / 1 1590057 2005 / 3 / 9 100404223 2008 / 7 / 23 2008 / 7 / 23 2008 / 7 / 23 Nippon Catalytic Chem Ind Japan Sasabe Masazumi Nogi Kozo Sakamoto Shigeru Fujita Yasuhiro Morita Akihiro Hattori Hiroaki zhu deqiang 11038 The Patent Agency of the Chinese Council for the Promotion of International Trade (CCPIT) No.1 Waidajie, Fuxingmen, Beijing 100086 Japan 2003 / 9 / 1 2003-309138

Description

technical field [0001] The present invention relates to a method for producing hydrogel particles and a method for cutting highly concentrated hydrogel sheets. More specifically, the present invention relates to: a method for producing granular hydrogel comprising cutting and a step of pulverizing; and a method for cutting high-concentration hydrogel sheets, which is applicable to the above-mentioned method for producing granular hydrogel. Background technique [0002] A technique for producing hydrogel particles comprising the steps of producing a water-absorbent resin hydrogel sheet and then pulverizing the hydrogel sheet, which is a well-known technique for producing water-absorbent resin particles, the water-absorbent Pellets are widely used, for example, in absorbent materials used in absorbent products such as disposable diapers. [0003] A method for continuously producing a high-concentration hydrogel sheet is proposed in Patent Document 1 below, comprising the ste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B26D1/00B26D1/22B26D1/24B26D1/38B26D1/62B26D7/08B26D9/00B29B9/04B29B13/10
CPCB29K2995/0092B29B9/04B26D1/385B26D9/00B26D2001/002B26D1/225B26D1/245B26D1/0006B26D1/626B26D7/088B29B13/10B29K2105/0061
Inventor 笹部昌纯野木幸三阪本繁藤田康弘森田晃弘服部浩明
Owner NIPPON SHOKUBAI CO LTD
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