Polyolefin-natural fiber composite composition for extrusion molding
The present disclosure relates to a polyolefin-natural fiber composite composition for extrusion molding, and more particularly to a polyolefin-natural fiber composite composition, which comprises polyolefin resin, natural fiber, thermoplastic elastic rubber and an anhydrous maleic acid-grafted polypropylene-based compatibilizer, and is useful as a material for an extrusion molded article by obtaining an effect of improving dimensional stability, mechanical properties and surface quality through adjusting three-dimensional structure and particle size of the polypropylene-based compatibilizer and binding rate of the maleic acid.
1. A polyolefin-natural fiber composite composition comprising:
polyolefin resin having a melt index of 8 to 150 g/10 min (230° C., 2.16 Kgf) in 20 to 95 wt %;
natural fiber in 3 to 40 wt %;
thermoplastic elastic rubber in 1 to 30 wt %; and
a polypropylene-based compatibilizer in 1 to 10 wt %, whose main chain is atactic polypropylene and whose diameter is 0.5 to 200 μm, and which is grafted with anhydrous maleic acid of 2 to 10 wt %,
wherein the thermoplastic elastic rubber is ethylene-octene rubber (EOR) and the polyolefin resin is polypropylene.
2. The polyolefin-natural fiber composite composition of claim 1 , wherein the natural fiber is at least one selected from the group consisting of kenaf, flax, hemp, jute, abaca, bamboo, coir, pineapple, ramie, sisal and henequen.
3. The polyolefin-natural fiber composite composition of claim 1 , which further comprises at least one general additive selected from the group consisting of:
an antioxidant, a UV stabilizer, a flame retardant, a coloring agent, a plasticizer, a thermal stabilizer, a slip agent and an antistatic agent.
4. A method for extrusion molding comprising a process of melt-extrusion molding the composition of claim 1 at the condition of screw rotation speed of 200 to 1,000 rpm and retention time of 10 to 60 sec.
5. A molded article manufactured by melt-extrusion molding the composition of claim 1 at the condition of screw rotation speed of 200 to 1,000 rpm and retention time of 10 to 60 sec.