High water-absorbent resin having crush resistance and method for manufacturing same

Patent metadata

Field	Value
Publication number	US-10046305-B2
Application number	US-201615327547-A
Country	US
Kind code	B2
Filing date	Feb 18, 2016
Priority date	Jun 10, 2015
Publication date	Aug 14, 2018
Grant date	Aug 14, 2018

Abstract

Disclosed are a surface-modified superabsorbent polymer and a method of preparing the same, wherein a superabsorbent polymer is surface-modified with the addition of a water-soluble salt having a multivalent cation and superhydrophobic microparticles, thereby improving attrition resistance, permeability and absorption speed without significantly deteriorating the other properties thereof.

First claim

The invention claimed is:

1. A surface-modified superabsorbent polymer, which is obtained using a water-soluble salt having a multivalent cation and particles having i) a BET specific surface area of 300 to 1500 m 2 /g and ii) a porosity of 50% or more.

2. The surface-modified superabsorbent polymer of claim 1 , wherein the water-soluble salt having a multivalent cation is used in an amount of 0.001 to 5.0 parts by weight based on 100 parts by weight of the superabsorbent polymer.

3. The surface-modified superabsorbent polymer of claim 1 , wherein the cation of the water-soluble salt having a multivalent cation comprises any one or more selected from the group consisting of Al 3+ , Zr 4+ , Sc 3+ , Ti 4+ , V 5+ , Cr 3+ , Mn 2+ , Fe 3+ , Ni 2+ , Cu 2+ , Zn 2+ , Ag + , Pt 4+ , and Au + , and an anion thereof comprises any one or more selected from the group consisting of a sulfuric acid group (SO 4 2− ), a sulfurous acid group (SO 3 2− ), a nitric acid group (NO 3 − ), a metaphosphoric acid group (PO 3 − ), and a phosphoric acid group (PO 4 3− ).

4. The surface-modified superabsorbent polymer of claim 3 , wherein the water-soluble salt having a multivalent cation is aluminum sulfate (Al 2 (SO 4 ) 3 ) or zirconium sulfate (Zr(SO 4 ) 2 ).

5. The surface-modified superabsorbent polymer of claim 1 , wherein the particles have a particle size ranging from 2 nm to 50 μm.

6. The surface-modified superabsorbent polymer of claim 1 , wherein the particles have superhydrophobicity with a water contact angle of 125° or more.

7. The surface-modified superabsorbent polymer of claim 1 , wherein the particles have a particle size ranging from 2 nm to 50 μm and superhydrophobicity with a water contact angle of 125° or more.

8. The surface-modified superabsorbent polymer of claim 1 , wherein the particles have a BET specific surface area of 500 to 1500 m 2 /g.

9. The surface-modified superabsorbent polymer of claim 1 , wherein the particles have a BET specific surface area of 700 to 1500 m 2 /g.

10. The surface-modified superabsorbent polymer of claim 6 , wherein the particles have superhydrophobicity with a water contact angle of 140° or more.

11. The surface-modified superabsorbent polymer of claim 6 , wherein the particles have superhydrophobicity with a water contact angle of 145° or more.

12. The surface-modified superabsorbent polymer of claim 1 , wherein the particles have a porosity of 90% or more.

13. A method of preparing a surface-modified superabsorbent polymer, comprising:
a) providing a superabsorbent polymer;
b) adding the superabsorbent polymer provided in a) with particles having i) a BET specific surface area of 300 to 1500 m 2 /g and ii) a porosity of 50% or more; and
c) adding the superabsorbent polymer pre-treated in b) with a water-soluble salt having a multivalent cation and mixing them together to thereby modify a surface of the superabsorbent polymer.

14. The method of claim 13 , further comprising milling the surface-modified superabsorbent polymer so that the milled superabsorbent polymer is sorted into particles having a size of less than 150 μm, particles having a size from 150 μm to less than 300 μm, particles having a size from 300 μm to less than 600 μm, particles having a size from 600 μm to less than 850 μm, and particles having a size of 850 μm or more.

15. The method of claim 13 , wherein the cation of the water-soluble salt having a multivalent cation comprises any one or more selected from the group consisting of Al 3+ , Zr 4+ , Sc 3+ , Ti 4+ , V 5+ , Cr 3+ , Mn 2+ , Fe 3+ , Ni 2+ , Cu 2+ , Zn 2+ , Ag + , Pt 4+ , and Au + , and an anion thereof comprises any one or more selected from the group consisting of a sulfuric acid group (SO 4 2− ), a sulfurous acid group (SO 3 2− ), a nitric acid group (NO 3 − ), a metaphosphoric acid group (PO 3 − ), and a phosphoric acid group (PO 4 3− ).

16. The method of claim 13 , wherein the water-soluble salt having a multivalent cation is aluminum sulfate (Al 2 (SO 4 ) 3 ) or zirconium sulfate (Zr(SO 4 ) 2 ).

17. The method of claim 13 , wherein the particles have a particle size ranging from 2 nm to 50 μm.

18. The method of claim 13 , wherein the particles have superhydrophobicity with a water contact angle of 125° or more.

19. The method of claim 13 , wherein the particles have a particle size ranging from 2 nm to 50 μm and superhydrophobicity with a water contact angle of 125° or more.

20. The method of claim 13 , wherein the particles have a BET specific surface area of 500 to 1500 m 2 /g.

21. The method of claim 13 , wherein the particles have a BET specific surface area of 700 to 1500 m 2 /g.

22. The method of claim 18 , wherein the particles have superhydrophobicity with a water contact angle of 140° or more.

23. The method of claim 18 , wherein the particles have superhydrophobicity with a water contact angle of 145° or more.

24. The method of claim 18 , wherein the particles have a porosity of 90% or more.

25. The method of claim 13 , wherein the particles having i) a BET specific surface area of 300 to 1500 m 2 /g and ii) a porosity of 50% or more are used in an amount of 0.001 to 5.0 parts by weight based on 100 parts by weight of the superabsorbent polymer.

26. The method of claim 13 , wherein the water-soluble salt having a multivalent cation is used in an amount of 0.001 to 5.0 parts by weight based on 100 parts by weight of the superabsorbent polymer.

Assignees

• Lg Chemical Ltd

Inventors

• Kim Su-Jin
• Kim Young-Sam
• Yang Young-In
• Hong Yeon-Woo

Classifications

• B01J20/3295

  Coatings made of particles, nanoparticles, fibers, nanofibers · CPC title

• C08K2003/3045

  Sulfates · CPC title

• B01J20/3021

  Milling, crushing or grinding · CPC title

• C08J3/24

  Crosslinking, e.g. vulcanising, of macromolecules (mechanical aspects B29C35/00; crosslinking agents C08K) · CPC title

• C08J7/14

  with acids, their salts or anhydrides · CPC title