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A kind of synthetic method of water-swellable body material

A technology of water-swelling body and synthesis method, which is applied in the field of polymer materials, can solve the problems of slow water-absorbing swelling rate, small water-absorbing swelling rate, and decreased mechanical properties, and achieve fast water-absorbing rate, high water-absorbing expansion rate, and mechanical property change. small effect

Active Publication Date: 2022-01-14
ZHEJIANG SHENZHOU TECH CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, traditional water-swellable materials have problems such as slow water absorption and expansion rate, small water absorption expansion rate, and decline in mechanical properties after being soaked in water.

Method used

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  • A kind of synthetic method of water-swellable body material
  • A kind of synthetic method of water-swellable body material
  • A kind of synthetic method of water-swellable body material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Inject 8.5 kg of ethylene oxide and 1.5 kg of propylene oxide into a sealed container with stirring with nitrogen pressure, and stir for 30 minutes to fully mix the materials. Add 80 g of initiator pentaerythritol and 30 g of potassium hydroxide into the reaction kettle, use a vacuum pump to remove the air in the reaction kettle, and then flush into nitrogen protection. Reactor is heated to 55 ℃, slowly press into the premixed material 10kg of ethylene oxide and propylene oxide, make it react. Adjust the feeding valve to keep the temperature in the reactor at 100°C and the pressure at 4kPa all the time, and keep cooling the temperature in the reactor with water. After adding the premixed materials, keep the temperature in the kettle and make the pressure drop to 0 slowly. Press the reacted coarse material into a neutralization kettle, add 45 g of neutralizing agent phosphoric acid and 50 g of refining agent aluminum hydroxide, stir for 1 hour, filter and pack to obtain...

Embodiment 2

[0039] Put 8 kg of ethylene oxide and 1 kg of propylene oxide into a sealed container with stirring with nitrogen pressure, and stir for 30 minutes to fully mix the materials. Add 50 g of initiator pentaerythritol and 10 g of potassium hydroxide into the reaction kettle, use a vacuum pump to remove the air in the reaction kettle, and then flush into nitrogen protection. Reactor is heated to 55 DEG C, slowly press into the premixed material 9kg of ethylene oxide and propylene oxide, make it react. Adjust the feeding valve to keep the temperature in the reactor at 100°C and the pressure at 4kPa all the time, and keep cooling the temperature in the reactor with water. After adding the premixed materials, keep the temperature in the kettle and make the pressure drop to 0 slowly. Press the reacted coarse material into a neutralization kettle, add 30 g of neutralizing agent phosphoric acid and 30 g of refining agent aluminum hydroxide, stir for 1 hour, filter and package to obtain ...

Embodiment 3

[0041]Put 9 kg of ethylene oxide and 2 kg of propylene oxide into a sealed container with stirring with nitrogen pressure, and stir for 30 minutes to make the materials fully mixed. Add 100 g of initiator pentaerythritol and 50 g of potassium hydroxide into the reaction kettle, use a vacuum pump to remove the air in the reaction kettle, and then flush into nitrogen protection. Reactor is heated to 55 ℃, slowly presses into 11kg of the premixed material of ethylene oxide and propylene oxide, makes it react. Adjust the feeding valve to keep the temperature in the reactor at 100°C and the pressure at 4kPa all the time, and keep cooling the temperature in the reactor with water. After adding the premixed materials, keep the temperature in the kettle and make the pressure drop to 0 slowly. Press the reacted coarse material into a neutralization kettle, add 50 g of neutralizing agent phosphoric acid and 70 g of refining agent aluminum hydroxide, stir for 1 hour, filter and pack to ...

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Abstract

The invention discloses a method for synthesizing a water-swellable body material, which comprises the following steps: 1. adding ethylene oxide, propylene oxide, pentaerythritol and potassium hydroxide into a vacuum pump to react to obtain a polymer polyether; Molecular polyether reacts with toluene diisocyanate to obtain a special prepolymer; 3. Stir the special prepolymer with liquid rubber, bentonite, anti-aging agent, white carbon black, chain extender and hydrophilic chain extender, and pour it into the pouring machine. Demoulding to obtain a water-swellable body material. The water-swellable body material improves the water absorption performance of the water-swellable body material, so that it has the advantages of fast water absorption rate and high water absorption expansion rate. The water-swellable material has good mechanical properties while improving water absorption performance, small change in mechanical properties before and after water absorption, and high stability. It is also oil-resistant, wear-resistant, and aging-resistant. It is an ideal material for waterproof and anti-seepage fields. .

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a method for synthesizing a water-swellable body material. Background technique [0002] The water-swellable material is a new type of polymer composite material, which can quickly absorb and retain water while maintaining the high elasticity of the rubber. After absorbing water, it can expand to several times or even hundreds of times. It can be widely used in tunnels, subways, swimming pools, Basements, underwater projects, offshore facilities, water supply facilities, civil buildings, etc., can also be used in precision instruments and food packaging. The water-swellable material contains certain hydrophilic groups or substances. When it encounters water, water molecules enter the interior of the material through surface adsorption, capillary action and diffusion, and form a polar relationship with the hydrophilic groups or substances. Strong bond. As the materia...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/66C08G18/10C08G18/48C08G18/32C08G18/34C08L75/08C08L9/02C08L23/22C08L23/16
CPCC08G18/10C08G18/6692C08G18/4837C08G18/6685C08L75/08C08G18/3206C08G18/348C08G18/3857C08L9/02C08L23/22C08L23/16
Inventor 董灵董云铨
Owner ZHEJIANG SHENZHOU TECH CHEM IND
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