WOOD PLASTIC COMPOSITES AND MANUFACTURING METHOD THEREOF

• US 20150119502A1
• Filed: 04/01/2013
• Published: 04/30/2015
• Est. Priority Date: 04/03/2012
• Status: Abandoned Application

• Current Assignee: LG Hausys Limited
• Original Assignee: LG Hausys Limited
• Inventors: Nam, Kyung Gu, Son, Jong Il
• Application Number:
  US14/389,623
• Publication Number:
  US 20150119502A1
• Time in Patent Office: Days
• US Class Current: 524/14
• CPC Class Codes: B29B 7/92 Wood chips or wood fibres
• CPC Class Codes: B29C 43/003 characterised by the choice of material
• CPC Class Codes: B29C 45/0001 characterised by the choice of material
• CPC Class Codes: B29C 48/022 characterised by the choice of material
• CPC Class Codes: B29C 48/023 Extruding materials comprising incompatible ingredients
• CPC Class Codes: B29K 2001/00 Use of cellulose, modified cellulose or cellulose derivatives, e.g. viscose, as moulding material
• CPC Class Codes: B29K 2101/12 Thermoplastic materials
• CPC Class Codes: C08L 23/06 Polyethene
• CPC Class Codes: C08L 23/10 Homopolymers or copolymers of propene
• CPC Class Codes: C08L 23/12 Polypropene
• CPC Class Codes: C08L 25/06 Polystyrene
• CPC Class Codes: C08L 27/06 Homopolymers or copolymers of vinyl chloride
• CPC Class Codes: C08L 33/12 Homopolymers or copolymers of methyl methacrylate
• CPC Class Codes: C08L 55/02 ABS [Acrylonitrile-Butadiene-Styrene] polymers
• CPC Class Codes: C08L 69/00 Compositions of polycarbonates; Compositions of derivatives of polycarbonates
• CPC Class Codes: C08L 97/00 Compositions of lignin-containing materials of polysaccharides C08L1/00 - C08L5/00
• CPC Class Codes: C08L 97/02 Lignocellulosic material, e.g. wood, straw or bagasse manufacture of articles made from lignocellulosic material by dry processes B27N

Abstract

Disclosed therein are wood plastic composites and a manufacturing method thereof, which can provide a high discoloration resistance by removing lignin from wood flour which is a main material of the wood plastic composites. The method of manufacturing wood plastic composites includes the steps of: removing lignin contained in wood chips through a cooking process of high temperature and pressure; crushing the wood chip from which lignin was removed in order to produce wood flour; putting and mixing polymer resins and additives into the wood flour so as to manufacture mixture of a gel phase; and extrusion-molding, injection-molding or compression-molding the mixture to manufacture wood plastic composites. The wood plastic composites and the manufacturing method thereof can prevent decoloration and after-yellowing even though the wood plastic composites are exposed to UV or moisture for a long time to thereby enhance long-term weather resistance.

Claims

1. A method of manufacturing wood plastic composites comprising the steps of:

removing lignin contained in wood chips through a cooking process of high temperature and pressure;

crushing the wood chip from which lignin was removed in order to produce wood flour;

putting and mixing polymer resins and additives into the wood flour so as to manufacture mixture of a gel phase; and

extrusion-molding, injection-molding or compression-molding the mixture to manufacture wood plastic composites.

2. The method of manufacturing wood plastic composites according to claim 1, wherein the cooking process comprises the steps of:

putting the wood chips and water into a digester at a weight ratio of 1;

2.0 to 5.0;

adding cooking liquor containing sulfurous acid or sulfuric acid; and

cooking the mixture at temperature of 80°

C. to 160°

C. for 120 minutes to 180 minutes.

3. The method of manufacturing wood plastic composites according to claim 1, wherein the wood flour is heated and dried at temperature of 80°

C. to 120°

C. till the wood flour has a moisture weight gain of 10% by weight to 20% by weight.

4. The method of manufacturing wood plastic composites according to claim 1, wherein the mixture selectively contains wood flour of 10% by weight to 90% by weight, polymer resins (at least one selected from PP, PE, PVC, ABS, PS, PC, and PMMA) of 10% by weight to 50% by weight, bonding agents of 3% by weight to 6% by weight, UV stabilizers of 0.2% by weight to 1% by weight, compatibilizers of 0.1% by weight to 50% by weight, fillers of 1% by weight to 50% by weight, antioxidants of 0.1% by weight to 30% by weight, lubricants of 0.1% by weight to 30% by weight, and pigments of 0.1% by weight to 30% by weight.

5. Wood plastic composites manufactured through the manufacturing method according to claim 1.

6. Wood plastic composites manufactured through the manufacturing method according to claim 2.

7. Wood plastic composites manufactured through the manufacturing method according to claim 3.

8. Wood plastic composites manufactured through the manufacturing method according to claim 4.