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Water swelling water stop material

A technology of swelling and water interception, which is applied in water conservancy projects, sea area projects, construction, etc., and can solve problems such as water leakage, unstable accumulation state, and collapse of sand bags

Active Publication Date: 2007-02-07
SANYO CHEM IND LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, when these sandbag substitutes are piled up to form a waterproof weir, when a large amount of water surges up, the accumulation state is unstable, the sandbags collapse, or the problem of water leakage from the gap between the swollen sandbags and sandbags occurs

Method used

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Examples

Experimental program
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Effect test

manufacture example 1

[0164] 230 g of acrylic acid, 133 g of a 48% aqueous sodium hydroxide solution, 1.0 g of pentaerythritol triallyl ether, and 636 g of water were added to a 1-liter beaker, and cooled to 10°C. This solution is put into adiabatic polymerization tank, feeds nitrogen gas, after making the dissolved oxygen of solution reach 0.1ppm (manufactured by Oriental (Oriente) Electric Company, trade name: dissolved oxygen meter D0220PB is measured), add 35% hydrogen peroxide aqueous solution 0.023g, 0.00575g of L-ascorbic acid, and 0.23g of potassium persulfate. The polymerization started in about 30 minutes after the addition and reached a maximum temperature of 72°C after about 2 hours. Then, it was aged at this temperature for 5 hours to complete the polymerization. The polymer thus obtained has the form of a hydrogel. This polymer is finely chopped with a blade sand mixer (manufactured by Iriesho Corporation, trade name: BENCH KNEADER PNV-1, rotation speed 70rpm), and mixed with 50% so...

manufacture example 2

[0166] In Production Example 1, after drying and pulverizing, 2.5 g of finely pulverized silica (Ceresia 250 (Syrisia), manufactured by Fuji Silesia (Silisia) Chemical Co., Ltd., average particle diameter 2.7 μm) was added, and uniformly mixed with a Nauta mixer , to obtain an average particle size of 370 μm, a swelling speed of 21 seconds, a water absorption of 550 g / g, a water retention / water absorption of 0.78 and a gel modulus of elasticity of 5×10 3 N / m 2 . Water-absorbent resin A(ii) having a water-soluble component content of 7% by mass, a residual water-soluble monomer content of 85 ppm, and a moisture clogging resistance of 3%.

manufacture example 3

[0168] 0.29 g (0.04 mol) of acrylic acid, 0.33 g of a 48% aqueous sodium hydroxide solution, 278.4 g (1.96 mol) of a 50% acrylamide aqueous solution, and 278 g of water were added to a 1-liter beaker, and cooled to 5°C. Put this solution into the adiabatic polymerization tank, pass into nitrogen, after the dissolved oxygen of solution reaches 0.1ppm, add 35% hydrogen peroxide aqueous solution 0.0001g, L-ascorbic acid 0.00005g, and 4,4-azo (4-cyano valeric acid) 0.025g. It took about 30 minutes after the addition to start the polymerization reaction, and after about 5 hours, the maximum temperature reached 75°C, and the polymerization was completed. A hydrogel-like polymer is obtained.

[0169] After pulverizing the gel with a meat grinder, it was dried at 120° C. for 1 hour with a belt dryer (ventilated dryer, manufactured by Inoue Metal Co., Ltd.) and pulverized to obtain an uncrosslinked dry powder with an average particle diameter of 500 μm. Take 100g of the uncrosslinked...

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Abstract

A water swelling water stop material comprised of a water permeable sheet, characterized in that water absorbent resin particles (A) are enclosed therein so that the water stop material upon water absorption and swelling has the configuration of polyhedron (B). The water stop material is thin to thereby facilitate storage thereof and is lightweight to thereby render carry thereof easy. The polyhedron (B) is so constructed that upon water absorption and swelling, at least two faces are planar. When the polyhedron (B) is formed into a rectangular solid or cube, even if multiple polyhedrons (B) are piled one upon another, they are stable and are resistant to collapse even under the influence of a large amount of water. When polyhedrons (B) of the same configuration are piled one upon another, any gaps between water stop materials are slight so as to inhibit water leakage through the gaps. Moreover, when the polyhedron (B) has a cavity, the cavity can be packed with a heavy solid material or can have a stake hammered therein so that the water stop material can stably resist violent water streams. Therefore, this water swelling water stop material can be appropriately used as a water stop material for rainwater penetration prevention in order to protect banks, buildings, houses, etc. in the event of flood, heavy rain, etc.

Description

technical field [0001] The present invention relates to a water-swellable water-cutting material used in case of water damage. More specifically, it relates to a water-swellable water-cutting material that swells rapidly, can be deposited in a stable state after being swelled by absorbing water, has little water leakage during accumulation, and is easy to transport before use. Background technique [0002] In the past, sandbags were used in emergency treatment to prevent the intrusion of water or sand when floods or floods occurred. Various alternatives to sand bags have been proposed in which a swelling water-absorbent resin is packed in a water-permeable bag and gelled by absorbing water to swell during use (for example, JP-A-2000-303424). [0003] However, when these sandbag substitutes are piled up to form a waterproof weir, when a large amount of water surges up, the accumulation state is unstable, the sandbags collapse, or the problem of water leakage from the gap bet...

Claims

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Application Information

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IPC IPC(8): E02B3/04
Inventor 木田博之钱谷幸雄
Owner SANYO CHEM IND LTD
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