COMPOSITE MATERIAL WITH IMPROVED MECHANICAL PROPERTIES AND MOLDED ARTICLE CONTAINING SAME

• US 20160263840A1
• Filed: 12/04/2014
• Published: 09/15/2016
• Est. Priority Date: 12/06/2013
• Status: Abandoned Application

• Current Assignee: LG Chem Limited (LG Corporation)
• Original Assignee: LG Chem Limited (LG Corporation)
• Inventors: Yun, Changhun, Choi, Yeon Sik, Lee, Su Min, Choi, Gi Dae
• Application Number:
  US14/762,347
• Publication Number:
  US 20160263840A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: B29C 45/0001 characterised by the choice of material
• CPC Class Codes: B29C 45/0005 using fibre reinforcements
• CPC Class Codes: B29C 48/022 characterised by the choice of material
• CPC Class Codes: B29C 70/025 with particular filler
• CPC Class Codes: B29K 2077/00 Use of PA, i.e. polyamides, e.g. polyesteramides or derivatives thereof, as moulding material
• CPC Class Codes: B29K 2105/0023 improving electric conduction
• CPC Class Codes: B29K 2105/12 of short lengths, e.g. chopped filaments, staple fibres or bristles
• CPC Class Codes: B29K 2105/16 Fillers
• CPC Class Codes: B29K 2307/04 Carbon
• CPC Class Codes: B29K 2507/04 Carbon
• CPC Class Codes: B29K 2995/0005 Conductive
• CPC Class Codes: B29K 2995/0046 Elastic
• CPC Class Codes: B29K 2995/0077 Yield strength; Tensile strength
• CPC Class Codes: B29L 2031/3406 Components, e.g. resistors
• CPC Class Codes: B29L 2031/3481 Housings or casings incorporating or embedding electric or electronic elements
• CPC Class Codes: C08J 2323/10 Homopolymers or copolymers of propene
• CPC Class Codes: C08J 2367/02 Polyesters derived from dicarboxylic acids and dihydroxy compounds; C08J2367/06 takes precedence
• CPC Class Codes: C08J 2369/00 Characterised by the use of polycarbonates; Derivatives of polycarbonates
• CPC Class Codes: C08J 2377/06 Polyamides derived from polyamines and polycarboxylic acids C08J2377/10 takes precedence
• CPC Class Codes: C08J 3/203 Solid polymers with solid and/or liquid additives
• CPC Class Codes: C08K 2201/001 : Conductive additives
• CPC Class Codes: C08K 2201/01 : Magnetic additives
• CPC Class Codes: C08K 7/02 : Fibres or whiskers
• CPC Class Codes: C08K 7/06 : Elements
• CPC Class Codes: C08K 7/24 : inorganic

Abstract

Provided is a composite produced by processing a resin composition including a thermoplastic resin, bundle type carbon nanotubes and a reinforcing material. The carbon nanotubes have an I_D/I_G of 1.0 to 1.0 before the processing. The ratio of residual length of the carbon nanotubes present in the composite is from 40% to 99%. The composite has improved mechanical properties without deterioration of conductivity. With these improvements, the composite can be used to manufacture various molded articles.

Claims

1. A composite produced by processing a resin composition comprising a thermoplastic resin, bundle type carbon nanotubes, and a reinforcing material wherein the carbon nanotubes have an I_D/I_G of 1.0 or less, the I_D/I_G being the ratio of the intensity of D-band peak to that of G-band peak in the Raman spectrum of the carbon nanotubes before the processing, and the ratio of residual length of the carbon nanotubes present in the composite is from 40% to 99%, the ratio of residual length being defined by Equation 1:

Ratio of residual length (%)=(Average length of the carbon nanotubes present in the composite after processing/Average length of the carbon nanotubes before processing)×

100  

 

(1).

2. The composite according to claim 1, wherein the I_D/I_G is from 0.01 to 0.99.

3. The composite according to claim 1, wherein the processing is extrusion.

4. The composite according to claim 1, wherein the ratio of residual length is from 40% to 90%.

5. The composite according to claim 1, wherein the carbon nanotubes comprise a plurality of carbon nanotube strands.

6. The composite according to claim 5, wherein the carbon nanotube strands are from 5 nm to 25 nm in average diameter.

7. The composite according to claim 1, wherein the average length of the carbon nanotubes before the processing is from 1 μ

m to 1000 μ

m.

8. The composite according to claim 1, wherein the carbon nanotubes present in the composite have an average length of 400 nm to 100 μ

m.

9. The composite according to claim 1, wherein the carbon nanotubes present in the composite have an average length of 500 nm to 30,000 nm.

10. The composite according to claim 1, wherein the carbon nanotubes present in the composite have an average length of 500 nm to 5,000 nm.

11. The composite according to claim 1, wherein the carbon nanotubes are used in an amount of 0.1 to 10 parts by weight, based on 100 parts by weight of the thermoplastic resin.

12. The composite according to claim 1, further comprising 0.1 to 10 parts by weight of one or more additives selected from the group consisting of flame retardants, impact modifiers, flame retardant aids, lubricants, plasticizers, heat stabilizers, anti-drip agents, antioxidants, compatibilizers, light stabilizers, pigments, dyes, and inorganic additives, based on 100 parts by weight of the thermoplastic resin.

13. The composite according to claim 1, wherein the thermoplastic resin is selected from the group consisting of:

polycarbonate resins;

polypropylene resins;

polyamide resins;

aramid resins;

aromatic polyester resins;

polyolefin resins;

polyester carbonate resins;

polyphenylene ether resins;

polyphenylene sulfide resins;

polysulfone resins;

polyethersulfone resins;

polyarylene resins;

cycloolefin resins;

polyetherimide resins;

polyacetal resins;

polyvinyl acetal resins;

polyketone resins;

polyether ketone resins;

polyether ether ketone resins;

polyaryl ketone resins;

polyether nitrile resins;

liquid crystal resins;

polybenzimidazole resins;

polyparabanic acid resins;

vinyl polymer and copolymer resins obtained by polymerization or copolymerization of one or more vinyl monomers selected from the group consisting of aromatic alkenyl compounds, methacrylic esters, acrylic esters, and vinyl cyanide compounds;

diene-aromatic alkenyl compound copolymer resins;

vinyl cyanide-diene-aromatic alkenyl compound copolymer resins;

aromatic alkenyl compound-diene-vinyl cyanide-N-phenylmaleimide copolymer resins;

vinyl cyanide-(ethylene-diene-propylene (EPDM))-aromatic alkenyl compound copolymer resins;

polyolefins;

vinyl chloride resins;

chlorinated vinyl chloride resins; and

mixtures thereof.

14. The composite according to claim 1, wherein the reinforcing material has a fibrous structure.

15. The composite according to claim 1, wherein the reinforcing material is selected from carbon fibers, glass fibers, milled glass fibers, aramid fibers, alumina fibers, silicon carbide fibers, ceramic fibers, asbestos fibers, gypsum fibers, metal fibers, and mixtures thereof.

16. The composite according to claim 1, wherein the reinforcing material is present in an amount of 0.1 to 50 parts by weight, based on 100 parts by weight of the thermoplastic resin.

17. The composite according to claim 1, further comprising a carbonaceous conductive additive.

18. The composite according to claim 17, wherein the carbonaceous conductive additive is selected from carbon black, graphene, fullerenes, carbon nanofibers, and mixtures thereof.

19. The composite according to claim 18, wherein the carbon black is selected from furnace black, channel black, acetylene black, lamp black, thermal black, ketjen black, and mixtures thereof.

20. The composite according to claim 17, wherein the carbonaceous conductive additive is present in an amount of 0.1 to 30 parts by weight, based on 100 parts by weight of the thermoplastic resin.

21. A molded article comprising the composite according to claim 1.

22. A molded article manufactured by processing the composite according to claim 17.

23. The molded article according to claim 22, wherein the processing is extrusion, injection molding or a combination thereof.

24. The molded article according to claim 22, wherein the molded article is an antistatic article, an electrical/electronic product housing or an electrical/electronic part.