Method for making absorbent for metal
Disclosed is a method for making absorbent for metal. In the method, at first, solution of first monomer and solution of second monomer are provided. Then, the solution of the second monomer is introduced into the solution of the first monomer. Finally, a microwave reaction is executed to provide micro-alls of absorbent for metal.
1. A method for making an absorbent for metal including the steps of:
providing a composition of a first monomer and a composition of a second monomer;
wherein the composition of the first monomer includes the first monomer and a solvent;
wherein the composition of the second monomer includes the second monomer, an initiator and a cationic dispersant;
wherein the cationic dispersant is a mixture of a material selected from the group consisting of 2-(methacryloyloxy)methyl-trimethylammonium chloride, 2-(methacryloyloxy)ethyl-trimethylammonium chloride, and 3-methacryloxy-propyl-trimethoxysilane with a material selected from the group consisting of hydrochloric acid and sulfuric acid;
introducing the composition of the second monomer in the composition of the first monomer; and
executing a microwave reaction to provide micro-balls of the absorbent for metal.
2. The method for making the absorbent for metal in accordance with claim 1 ,
wherein the first and the second monomers are selected from the group consisting of methylmethacrylate, phenylethene, vinyl acetate, acrylic acid, methacrylic acid, trifluoromethylacrylic acid, methylenesuccinic acid and vinylbenzoic acid.
3. The method for making the absorbent for metal in accordance with claim 2 ,
wherein the first and the second monomers are made of a same compound.
4. The method for making the absorbent for metal in accordance with claim 2 ,
wherein the first monomer is made of methylmethacrylate while the second monomer is made of acrylic acid.
5. The method for making the absorbent for metal in accordance with claim 1 ,
wherein the solvent is a solution that contains a small amount of salt.
6. The method for making the absorbent for metal in accordance with claim 5 ,
wherein the solution includes water and a material selected from the group consisting of NaCl and NH 4 Cl.
7. The method for making the absorbent for metal in accordance with claim 6 ,
wherein a weight concentration of salt in the water is 0.01% to 1%.
8. The method for making the absorbent for metal in accordance with claim 1 ,
wherein the initiator is selected from the group consisting of azobisisobutyronitrile, lauroyl peroxide, ammonium persulfate and potassium persulphate.
9. The method for making the absorbent for metal in accordance with claim 1 ,
wherein the microwave reaction is executed for 5 to 120 minutes, at 30 watts to 300 watts, at 60° C. to 85° C.
10. The method for making the absorbent for metal in accordance with claim 9 ,
wherein the step of executing the microwave reaction includes the step of providing a reactor with a cooling unit to ensure that microwave heating is executed in the entire period of the microwave reaction.
11. The method for making the absorbent for metal in accordance with claim 1 , further including the steps of:
executing a centrifugal process on a solution of the step of executing the microwave reaction, thus providing micro-balls;
filtering the micro-balls;
washing the micro-balls; and
drying the micro-balls.
12. The method for making an absorbent for metal including the steps of:
providing a composition of a first monomer and a composition of a second monomer;
wherein the composition of the first monomer includes the first monomer and a solvent;
wherein the composition of the second monomer includes the second monomer, an initiator and a cationic dispersant;
wherein the cationic dispersant is a mixture of methacryloyloxyethyl trimethyl ammonium chloride with methacrylatoethyl trimethyl ammonium chloride;
introducing the composition of the second monomer in the composition of the first monomer; and
executing a microwave reaction to provide micro-balls of the absorbent for metal.