SHREDDER FOR SUPER ADSORBENT POLYMER AND PREPARATION METHOD OF SUPER ABSORBENT POLYMER USING THE SAME

• US 20110290920A1
• Filed: 05/27/2011
• Published: 12/01/2011
• Est. Priority Date: 05/28/2010
• Status: Active Grant

• Current Assignee: LG Chem Limited (LG Corporation)
• Original Assignee: LG Chem Limited (LG Corporation)
• Inventors: Kim, Gi-Cheul, Lee, Sang-Gi, Won, Tae-Young, Han, Chang-Sun, Kim, Kyu-Pal, Leem, Gyu, Bae, Jin-Hyun, Park, Sung-Soo
• Granted Patent: US 8,919,683 B2
• Time in Patent Office: Days
• US Class Current: 241/25
• CPC Class Codes: B02C 18/145 with knives spaced axially and circumferentially on the periphery of a cylindrical rotor unit
• CPC Class Codes: B02C 18/148 specially adapted for disintegrating plastics, e.g. cinematographic films for plastic bottles B02C19/0093, disintegrating plastics B29B17/00
• CPC Class Codes: B02C 18/18 Knives; Mountings thereof
• CPC Class Codes: B02C 19/00 Other disintegrating devices or methods for grain B02C9/00
• CPC Class Codes: B02C 19/0056 specially adapted for specific materials not otherwise provided for
• CPC Class Codes: B02C 2018/188 Stationary counter-knives; Mountings thereof
• CPC Class Codes: B02C 23/24 Passing gas through crushing or disintegrating zone B02C15/001, B02C23/38, B02C23/40 take precedence
• CPC Class Codes: B26D 1/38 and coacting with a fixed blade or other fixed member
• CPC Class Codes: B26D 1/385 for thin material, e.g. for sheets, strips or the like
• CPC Class Codes: B29B 9/04 in the form of plates or sheets

Abstract

The present invention is to provide a shredder for super absorbent polymer that comprises: an inlet portion for feeding a plate-shaped super absorbent polymer; a pulverizing portion for pulverizing the super absorbent polymer fed through the inlet portion; and an outlet portion for discharging the pulverized super absorbent polymer from the pulverizing portion. The pulverizing portion comprises: a rotary drum to which a plurality of rotary blades are attached; at least fixed blade for pulverizing the super absorbent polymer in cooperation with the plural rotary blades; and a housing for holding the rotary drum and the at least one fixed blade. Each rotary blade has a shape of polygon with at least one vertex having an acute angle of at most 45°.

The present invention is also to provide a preparation method for super absorbent polymer using the shredder for super absorbent polymer.

Claims

1. A shredder for super absorbent polymer, comprising:

an inlet portion for feeding a plate-shaped super absorbent polymer;

a pulverizing portion for pulverizing the super absorbent polymer fed through the inlet portion; and

an outlet portion for discharging the pulverized super absorbent polymer from the pulverizing portion,

the pulverizing portion comprising;

a rotary drum having a plurality of rotary blades attached thereto;

at least fixed blade for pulverizing the super absorbent polymer in cooperation with the plural rotary blades; and

a housing for holding the rotary drum and the at least one fixed blade mounted therein,

the rotary blades having a shape of polygon with at least one vertex having an acute angle of at most 45°

.

2. The shredder for super absorbent polymer as claimed in claim 1, wherein the rotary drum has rotary blade mounting grooves arranged in circumferential direction,

the rotary blades being rested in the mounting grooves to expose at least one vertex thereof lifted to have an acute angle of at most 45°

on the drum.

3. The shredder for super absorbent polymer as claimed in claim 2, wherein the rotary blade mounting groove has a rotary blade mounting jig fixed thereon,

each rotary blade being fixedly bolted to the rotary blade mounting jig.

4. The shredder for super absorbent polymer as claimed in claim 1, wherein each rotary blade has a plurality of vertices of the polygonal shape lifted to have an acute angle of at most 45°

.

5. The shredder for super absorbent polymer as claimed in claim 1, wherein each rotary blade has a concave face in the direction of lifting the at least one vertex, the concave face having edges with an acute angle.

6. The shredder for super absorbent polymer as claimed in claim 5, wherein each edge of the face in the direction of lifting the at least one vertex connects the respective vertices of the polygonal shape in the form of a curved line.

7. The shredder for super absorbent polymer as claimed in claim 1, wherein the plural rotary blades are arranged in the form of at least one spiral on the rotary drum.

8. The shredder for super absorbent polymer as claimed in claim 1, wherein the plural rotary blades are linearly arranged in at least one row in the axial direction of the rotary drum.

9. The shredder for super absorbent polymer as claimed in claim 1, wherein the at least one fixed blade has a plurality of sawteeth.

10. The shredder for super absorbent polymer as claimed in claim 1, wherein the at least one fixed blade is provided as a plurality of fixed blades.

11. The shredder for super absorbent polymer as claimed in claim 10, wherein the at least one fixed blade is provided as a plurality of fixed blades arranged in the rotation direction of the rotary drum.

12. The shredder for super absorbent polymer as claimed in claim 1, further comprising:

a blower for blowing air of a predetermined temperature into the pulverizing portion; and

an outlet passage for discharging the air from the pulverizing portion.

13. The shredder for super absorbent polymer as claimed in claim 1, further comprising:

a meat chopper for further pulverizing the super absorbent polymer discharged from the outlet portion.

14. The shredder for super absorbent polymer as claimed in claim 1, further comprising:

a release agent supplying means for supplying water or a release agent for the super absorbent polymer pulverized from the pulverizing portion.

15. A method for preparing a super absorbent polymer, comprising:

preparing a monomer composition including an aqueous ethylene-based unsaturated monomer, and a polymerization initiator;

supplying the monomer composition to a polymerization reactor including a conveyer belt and applying UV radiation or heat onto the supplied monomer composition on the conveyer belt to prepare a plate-shaped super absorbent polymer;

supplying the polymerized plate-shaped super absorbent polymer to the shredder for super absorbent polymer according to any one of the claims 1 to 12 to perform a primary pulverization;

drying the pulverized super absorbent polymer; and

performing a secondary pulverization for the dried super absorbent polymer.

16. The method as claimed in claim 15, wherein the primary pulverization is carried out to provide a particle diameter of the pulverized super absorbent polymer in the range of 1 to 50 mm.

17. The method as claimed in claim 15, wherein the secondary pulverization is carried out to provide a particle diameter of the pulverized super absorbent polymer in the range of 150 to 850 μ

m.