Method for synthesizing water-expandable body material

A technology for a water-swellable body and a synthesis method, applied in the field of polymer materials, can solve the problems of decreased mechanical properties, small water-absorbing expansion rate, slow water-absorbing expansion rate, etc., and achieves small changes in mechanical properties, high water-absorbing expansion rate and water absorption rate. quick effect

Active Publication Date: 2019-12-03
ZHEJIANG SHENZHOU TECH CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional water-swellable materials have problems such as slow water-absorbing swelling speed, small water-absorbing swelling rate, and decline in mechanical properties after being soaked in water.

Method used

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  • Method for synthesizing water-expandable body material
  • Method for synthesizing water-expandable body material
  • Method for synthesizing water-expandable 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 under nitrogen pressure, and stir for 30 minutes to fully mix the materials. Add 80 g of initiator pentaerythritol and 30 g of potassium hydroxide in the reactor, take out the air in the reactor with a vacuum pump, and then flush into nitrogen protection. Reactor is heated to 55 DEG C, 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. The crude material that has reacted is pressed in the neutralization kettle, adds neutralizing agent phosphoric acid 45g and refining agent aluminum hydroxide 50g, stirs 1 hour, filters and packs and obtains macro...

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 ℃, slowly presses into the premixed material 9kg of ethylene oxide and propylene oxide, makes it react. Regulate feed valve, keep the temperature in the reactor at 100 DEG C all the time, the pressure is 4kPa, and constantly cool the temperature in the kettle with water. After the premixed material is added, keep the temperature in the kettle and make its pressure drop to 0 slowly. The crude material that reaction is finished is pressed in the neutralization kettle, adds neutralizing agent phosphoric acid 30g and refining agent aluminum hydroxide 30g, stirs 1 hour, filters and packs and...

Embodiment 3

[0041] Ethylene oxide 9kg and propylene oxide 2kg are injected in the airtight container with stirring with nitrogen pressure, stirred 30 minutes and made material fully mix. 100 g of initiator pentaerythritol and 50 g of potassium hydroxide were added into the reaction kettle, and the air in the reaction kettle was evacuated with a vacuum pump, and then flushed into nitrogen protection. Reactor is heated to 55 ℃, slowly presses into the premixed material 11kg 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. The crude material that has reacted is pressed in the neutralization kettle, adds neutralizing agent phosphoric acid 50g and refining agent aluminum hydroxide 70g, stirs 1 hour, and filt...

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Abstract

The invention discloses a method for synthesizing a water-expandable body material. The method comprises the following steps: 1. adding ethylene oxide, propylene oxide, pentaerythritol and potassium hydroxide into a vacuum pump, and carrying out a reaction, so as to obtain a macromolecular polyether; 2. subjecting the macromolecular polyether to a reaction with toluene diisocyanate, so as to obtain a special prepolymer; and 3. stirring the special prepolymer with liquid rubber, bentonite, an anti-aging agent, white carbon black, a chain extender and a hydrophilic chain extender, injecting themixture into a casting machine, and carrying out demolding, thereby obtaining the water-expandable body material. According to the water-expandable body material, the water absorbency of the water-expandable body material is improved, and the water-expandable body material has the advantages of high water absorption rate and high water absorption expansion rate. The water absorbency of the water-expandable body material is improved, and meanwhile, the water-expandable body material has the characteristics that the mechanical properties are good, the change of the mechanical properties is smallbefore and after water absorption, and the stability is high; and the water-expandable body material is oil-resistant, wear-resistant and aging-resistant and is an ideal material applied to the fields of waterproofing and anti-seepage.

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 Applications(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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