Superabsorbent polymer and preparation method therefor

Patent metadata

Field	Value
Publication number	US-9555393-B2
Application number	US-201415024779-A
Country	US
Kind code	B2
Filing date	Dec 3, 2014
Priority date	Dec 3, 2013
Publication date	Jan 31, 2017
Grant date	Jan 31, 2017

Abstract

Disclosed herein are a superabsorbent polymer resin incorporated with a particles meeting the following properties i) to ii): i) a BET specific surface area of 300 to 1500 m 2 /g, ii) a porosity of 50% or more, and a method for preparing the same.

First claim

The invention claimed is:

1. A superabsorbent polymer resin incorporated with a particles meeting the following properties i) to ii):
i) a BET specific surface area of 300 to 1500 m 2 /g,
ii) a porosity of 50% or more.

2. The superabsorbent polymer resin of claim 1 , wherein the particles have a particle size of 2 nm˜50 μm.

3. The superabsorbent polymer resin of claim 1 , wherein the particles have a superhydrophobicity as large as a water contact angle of 125° or more.

4. The superabsorbent polymer resin of claim 1 , wherein the particles have a particle size of 2 nm˜50 μm and a superhydrophobicity as large as a water contact angle of 125° or more.

5. The superabsorbent polymer resin of claim 1 , wherein the particles have a BET specific surface area of 500 to 1,500 m 2 /g.

6. The superabsorbent polymer resin of claim 3 , wherein the particles have a water contact angle of 140° or higher.

7. The superabsorbent polymer resin of claim 1 , wherein the particles have a porosity of 90% or greater.

8. The superabsorbent polymer resin of claim 1 , wherein the particles are used in an amount of 0.001 to 1 part by weight, based on 100 parts by weight of the superabsorbent polymer resin.

9. The superabsorbent polymer resin of claim 1 , wherein the particles are selected from the group consisting of silica, alumina, titania, and a combination thereof.

10. A method for preparing a superabsorbent polymer resin, comprising:
a) polymerizing a monomer composition containing an aqueous ethylenetic unsaturated monomer and a polymerization initiator by heat or light to give a hydrogel polymer;
b) drying the hydrogel polymer;
c) pulverizing the dried hydrogel polymer;
d) adding a surface cross-linking agent to the pulverized hydrogel polymer to perform a surface cross-linking reaction; and
e) blending the surface-crosslinked superabsorbent polymer resin of step d) with a particles meeting the following properties i) to ii):
i) a BET specific surface area of 300 to 1500 m 2 /g,
ii) a porosity of 50% or more.

11. The method of claim 10 , wherein the particles have a particle size of 2 nm˜50 μm.

12. The method of claim 10 , wherein the particles have a superhydrophobicity as large as a water contact angle of 125° or more.

13. The method of claim 10 , wherein the particles have a particle size of 2 nm˜50 μm and a superhydrophobicity as large as a water contact angle of 125° or more.

14. The method of claim 10 , wherein the particles have a BET specific surface area of 500 to 1,500 m 2 /g.

15. The method of claim 12 , wherein the particles have a water contact angle of 140° or higher.

16. The method of claim 10 , wherein the particles have a porosity of 90%.

17. The method of claim 1 , wherein the particles are used in an amount of 0.01 to 0.3 parts by weight, based on a total weight of the superabsorbent polymer resin.

18. The method of claim 10 , wherein the particles are selected from the group consisting of silica, alumina, titania, and a combination thereof.

19. The method of claim 10 , further comprising crushing the hydrogel polymer into a size of 1 mm to 15 mm, prior to the drying step b).

20. The superabsorbent polymer resin of claim 4 , wherein the particles have a water contact angle of 140° or higher.

21. The method of claim 13 , wherein the particles have a water contact angle of 140° or higher.

Assignees

• Lg Chemical Ltd

Inventors

• Lee Seung-Mo
• Kim Young-Sam
• Oh Kyoung-Shil
• Yang Young-In
• Kim Ye-Hon

Classifications

• C08J2300/14

  Water soluble or water swellable polymers, e.g. aqueous gels · CPC title

• C08F283/065 Primary

  on to unsaturated polyethers, polyoxymethylenes or polyacetals · CPC title

• C08L101/00

  Compositions of unspecified macromolecular compounds · CPC title

• B01J20/28064

  being in the range 500-1000 m2/g · CPC title

• B01J20/261

  obtained by reactions only involving carbon to carbon unsaturated bonds (macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds per se C08F) · CPC title