Method for making an aqueous hydrogel

Patent metadata

Field	Value
Publication number	US-2025026870-A1
Application number	US-202418909333-A
Country	US
Kind code	A1
Filing date	Oct 8, 2024
Priority date	Jul 5, 2019
Publication date	Jan 23, 2025
Grant date	—

Abstract

Cross-linked polyvinyl polymers comprising charged groups and methods of making are disclosed. The polymers are effective and durable adsorbent of dyes from aqueous solutions. Also, a method of removal of dyes from contaminated water is disclosed.

First claim

1 - 10 . (canceled)

11 . A method for making an aqueous hydrogel composition, comprising:
mixing an aqueous solution of a vinylphosphonic acid having chemical formula I:

and an aqueous solution of bis[2-(methyacryloyloxy)ethyl] phosphate (BMEP)
to form an aqueous mixture; and
initiating a polymerization reaction in the aqueous mixture by adding an azo compound initiator to form a polymerization reaction mixture, wherein during the mixing and the initiating the molar ratio of the vinylphosphonic acid, the BMEP, and the azo compound initiator is 1:0.4:0.01, wherein the initiating includes heating the polymerization reaction mixture at a temperature in the range of 60 to 120° C.;
adjusting the pH of the polymerization reaction mixture to about 9,
heating the polymerization reaction mixture to form the aqueous hydrogel composition, wherein the aqueous hydrogel composition comprises a cross linked polyvinyl polymer,
wherein Formula I R 1 is phosphonate; and R 2 , R 3 , and R 4 are independently hydrogen, sulfonate, carboxylate, phosphonate, optionally substituted methyl, ethyl, propyl, optionally substituted cycloalkyl, or optionally substituted aryl or heteroaryl;
wherein the BMEP is present in the cross linked polyvinyl polymer in an amount of about 40 mol % based on the total molar amount of the vinylphosphonic acid of formula I and the BMEP; and
wherein the cross linked polyvinyl polymer consists essentially of polymerized units of the vinylphosphonic acid having chemical formula I and the BMEP.

12 - 14 . (canceled)

15 . The method of claim 11 , wherein the polymerization reaction is initiated with azobis(2-methylpropionamidine dihydrochloride).

16 . The method of claim 15 , wherein the initiating comprises heating the polymerization reaction mixture at a temperature in the range of 70 to 90° C.

17 . The method of claim 11 , wherein the vinylphosphonic acid of formula I is vinyl phosphonic acid.

18 - 20 . (canceled)

21 . The method of claim 11 , wherein the cross linked polyvinyl polymer consists of polymerized units of the vinyl phosphonic acid of formula I cross-linked with the BMEP.

22 . The method of claim 11 , wherein the BMEP is present in the cross linked polyvinyl polymer in an amount of 40±4 mol. %.

Assignees

• Univ Imam Abdulrahman Bin Faisal

Inventors

• Bozkurt Ayhan
• Anil Seyda T Gunday
• Anil Ismail

Classifications

• C08F230/02

  containing phosphorus · CPC title

• C02F1/285

  using synthetic organic sorbents · CPC title

• C02F2101/308

  Dyes; Colorants; Fluorescent agents · CPC title

• C08J2343/02

  Homopolymers or copolymers of monomers containing phosphorus · CPC title

• B01J20/267 Primary

  Cross-linked polymers · CPC title