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 accumula

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0163] [Manufacturing Example 1]

[0164] In a 1-liter beaker, 230 g of acrylic acid, 133 g of 48% sodium hydroxide aqueous solution, 1.0 g of pentaerythritol triallyl ether, and 636 g of water were added, and cooled to 10°C. Put the solution in an adiabatic polymerization tank, and then pass nitrogen gas to make the dissolved oxygen of the solution reach 0.1 ppm (measured with Orient Electric Co., Ltd., trade name: Dissolved Oxygen Meter D0220PB), and add 35% hydrogen peroxide aqueous solution 0.023g, 0.00575g of L-ascorbic acid, and 0.23g of potassium persulfate. The polymerization reaction started in about 30 minutes after the addition, and the maximum temperature of 72°C was reached after about 2 hours. Then, it was aged at this temperature for 5 hours to complete the polymerization. The polymer thus obtained has a hydrogel state. The polymer was chopped with a blade sand mixer (manufactured by Irie Co., Ltd., trade name: BENCH KNEADER PNV-1, rotation number 70 rpm) while stirr...

Example Embodiment

[0165] [Manufacturing Example 2]

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

Example Embodiment

[0167] [Manufacturing Example 3]

[0168] In a 1 liter beaker, 0.29 g (0.04 mol) of acrylic acid, 0.33 g of 48% sodium hydroxide aqueous solution, 278.4 g (1.96 mol) of 50% acrylamide aqueous solution, and 278 g of water were added, and cooled to 5°C. Put the solution into an adiabatic polymerization tank, and let nitrogen gas flow so that the dissolved oxygen of the solution reaches 0.1 ppm, then add 0.0001 g of 35% hydrogen peroxide aqueous solution, 0.00005 g of L-ascorbic acid, and 4,4-azo (4-cyanide). Valeric acid) 0.025g. After the addition, the polymerization reaction started in about 30 minutes, and the maximum temperature of 75°C was reached after about 5 hours to complete the polymerization. A water-containing gel-like polymer was obtained.

[0169] After the gel was pulverized with a meat chopper, it was dried with a belt dryer (air dryer, manufactured by Inoue Metal Co., Ltd.) at 120°C for 1 hour and pulverized to obtain an uncrosslinked dry powder with an average part...

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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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