Apparatus for preparing polymer latex resin powder and method of preparing polymer latex resin powder using the same

Patent metadata

Field	Value
Publication number	US-9504972-B2
Application number	US-201314367557-A
Country	US
Kind code	B2
Filing date	Dec 24, 2013
Priority date	Jun 3, 2013
Publication date	Nov 29, 2016
Grant date	Nov 29, 2016

Abstract

Disclosed are an apparatus for preparing a polymer latex resin powder in which an efficiency of mixing of steam, a latex, and a coagulant is increased by introducing a non-continuous screw into a reactor that performs coagulation and aging and thus a moisture content of a slurry is decreased and, accordingly, drying efficiency may be enhanced, and a polymer latex resin powder with excellent color and powder characteristics may be prepared using a decreased amount of coagulant and a method of preparing a polymer latex resin powder by using the same.

First claim

The invention claimed is:

1. An apparatus for preparing a polymer latex resin powder comprising:
a reactor for coagulation of a polymer latex, in which the reactor comprises a hollow reaction tube through which a latex passes, at least one barrel pin protruding from an inner wall of the reaction tube to an inner side of the reaction tube, a rotating shaft extending along a central axis in a longitudinal direction of the reaction tube, and one or more stirrers protruding from an outer surface of the rotating shaft towards the inner wall of the reaction tube,
wherein the one or more stirrers comprise a non-continuous screw,
wherein, in the non-continuous screw, an inclination angle α of a rotary wing with respect to an axis perpendicular to the rotating shaft is 0.1° to 10°, and
wherein the apparatus comprises at least one of a dehydrator and a dryer.

2. The apparatus according to claim 1 , wherein the number of the one or more stirrers is 1 to 20.

3. The apparatus according to claim 1 , wherein the non-continuous screw comprises one or more openings.

4. The apparatus according to claim 3 , wherein a total area of the one or more openings is in a range of 0.05 to 1 with respect to a total area of rotary wings.

5. The apparatus according to claim 1 , wherein the reaction tube of the reactor comprises at least one barrel pin extending from an outside of the reaction tube to an inside of the reaction tube.

6. The apparatus according to claim 1 , wherein the reactor comprises a polymer latex introduction line, a coagulant introduction line, and a steam introduction line.

7. The apparatus according to claim 1 , wherein the reactor is an integrated reactor for coagulation and aging of the polymer latex.

8. A method of preparing a polymer latex resin powder by using the apparatus according to claim 1 .

9. The method according to claim 8 , wherein the polymer latex resin powder has a moisture content of 25% or less.

10. The method according to claim 8 , wherein a residence time of a polymer slurry in coagulation and aging is 0.5 minutes to 30 minutes.

11. The method according to claim 8 , wherein a polymer resin is a graft copolymer of vinyl cyanide compound-conjugated diene-based compound-aromatic vinyl compound.

Assignees

• Lg Chemical Ltd

Inventors

• Kim Chang Sull
• Ju Min Cheol
• Lee Hyung Sub
• Jeong Hoi In

Classifications

• B01F7/08 Primary

  Operations & Transport · mapped topic

• B01J8/10

  moved by stirrers or by rotary drums or rotary receptacles {or endless belts} · CPC title

• B01J19/20

  in the form of helices, e.g. screw reactors · CPC title

• B01J2219/00761

  Details of the reactor · CPC title

• C08L51/003

  grafted on to macromolecular compounds obtained by reactions only involving unsaturated carbon-to-carbon bonds (C08L51/04, C08L51/06 take precedence) · CPC title