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Process for preparing high-water-absorption flexible material by ultraviolet surface graft method

A super absorbent material and surface grafting technology, applied in the field of polymer materials, can solve problems such as uniformity and difficulty in coating, and achieve the effects of promoting grafting, short reaction time, and simple and easy reaction conditions

Inactive Publication Date: 2002-02-06
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The water absorption and water retention can be improved by making the superabsorbent resin into a film, fiber, or powder. However, it is difficult to achieve uniform coating with the previous coating technology. The finished product is soft and tough, and the resin is more likely to reunite after absorbing water. together

Method used

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  • Process for preparing high-water-absorption flexible material by ultraviolet surface graft method
  • Process for preparing high-water-absorption flexible material by ultraviolet surface graft method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Rinse the polypropylene homopolymer film with acetone, dry it in the air to constant weight, put it into the reactor, and cut the polypropylene homopolymer film into 4×2cm 2 , the thickness is 0.05mm. Add 2ml of benzene solution of photosensitizer benzophenone with a mass percentage of 25% on the polypropylene film at the bottom of the reactor. The distance is 35cm, and the nitrogen flow rate is 25L / h. Extract the reacted polypropylene film with acetone, air-dry to constant weight, and spread it on the bottom of the reactor after weighing.

[0019] Add 0.5 times the volume of deionized water to acrylic acid, partially neutralize it with sodium hydroxide, prepare an acrylic acid solution with a neutralization degree of 50%, add a certain amount of acrylamide, so that the molar ratio of acrylamide and acrylic acid is 1 : 3. The photosensitizer benzophenone was added to saturate the solution with benzophenone. Pass the prepared acrylic acid and acrylamide solution thro...

Embodiment 2

[0021] The polypropylene film homopolymer is soaked with acetone, dried in a vacuum oven to constant weight, put into the reactor, and the polypropylene homopolymer film is cut into 4×2cm 2 , the thickness is 0.1mm. Add 4ml of benzene solution of photosensitizer benzophenone with 20% mass percentage on the polypropylene film at the bottom of the reactor, seal the reactor, feed nitrogen and graft it with ultraviolet light for 3min, the distance between the lamp tube and the sample The distance is 30cm, and the nitrogen flow rate is 20L / h. Extract the reacted polypropylene film with acetone, dry it in a vacuum oven to constant weight, and spread it on the bottom of the reactor after weighing.

[0022] Add deionized water 1 times its volume to acrylic acid, partially neutralize it with sodium hydroxide, prepare an acrylic acid solution with a neutralization degree of 60%, add a certain amount of acrylamide, so that the molar ratio of acrylamide and acrylic acid is 1 : 4. The p...

Embodiment 3

[0024] Rinse the polypropylene copolymer film with methanol, dry it in the air to constant weight, put it into the reactor, and cut the polypropylene copolymer film into 4×2cm 2 , the thickness is 0.2mm. Add the benzene solution of 15% photosensitizer xanthone to the polypropylene film at the bottom of the reactor by adding 4ml of mass percentage of prepared 4ml on the polypropylene film at the bottom of the reactor. The distance is 25cm, and the nitrogen flow rate is 15L / h. Extract the reacted polypropylene film with methanol, air-dry to constant weight, and spread it on the bottom of the reactor after weighing.

[0025] Add deionized water three times its volume to acrylic acid, partially neutralize it with sodium hydroxide, prepare an acrylic acid solution with a neutralization degree of 65%, add a certain amount of acrylamide, so that the molar ratio of acrylamide and acrylic acid is 1 : 5. The photosensitizer xanthone is added so that the mole percentage of the photose...

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Abstract

A process for preparing the high-water-absorption flexible material by ultraviolet surface graft method includes immersing polyacrylic film in organic solvent, drying in air, loading it in reactor, adding solution of photosensitive agent, closing the reactor, introducing chlorine gas into it while ultraviolet ray radiation for graft, extracting the polyacrylic film with organic solvent, adding deionized water to acrylic acid, partial neutralization with NaOH, adding acrylamide, adding photosensing agent, taking out the polyacrylic film and ultraviolet graft. Its advantages are short reaction time, simple reaction condition, and high flexibility of product.

Description

Technical field: [0001] The invention relates to a method for preparing a flexible superabsorbent material by using an ultraviolet surface grafting method, which belongs to the technical field of polymer materials. The prepared superabsorbent material can be made into a flexible and tough water-absorbent film, which is comparable to existing products. than, it can be used more conveniently and efficiently. Background technique: [0002] Superabsorbent resin is a functional polymer material that has developed rapidly in recent years, and its water absorption capacity can reach hundreds to thousands of times. Once absorbed, the moisture is not easy to be squeezed out by mechanical pressure, and has excellent water retention performance. In addition, it also has the functions of thickening and oxygen absorption. Therefore, it is widely used in agriculture, forestry, gardening and other soil improvers, sanitary products, industrial dehydrating agents, preservatives, anti-fog, m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/18C08L23/12
Inventor 张乐谢续明张建王晓工
Owner TSINGHUA UNIV
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