Compositions containing polyphenylene ether and/or polystyrene having improved tribological properties and methods for improving tribological properties of polyphenylene ether and/or polystyrene compo

A technology for polystyrene, friction properties, applied in the field of compositions having improved friction properties comprising polyphenylene ether and/or polystyrene and improving the friction properties of polyphenylene ether and/or polystyrene compositions, Ability to resolve issues such as unjustifiable increased costs

Active Publication Date: 2006-04-05
SHPP GLOBAL TECH BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Finally, PTFE is generally more expensive than the base polymer it is blended into, in which case the level of benefits offered by PTFE may not justify the added expense

Method used

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  • Compositions containing polyphenylene ether and/or polystyrene having improved tribological properties and methods for improving tribological properties of polyphenylene ether and/or polystyrene compo
  • Compositions containing polyphenylene ether and/or polystyrene having improved tribological properties and methods for improving tribological properties of polyphenylene ether and/or polystyrene compo

Examples

Experimental program
Comparison scheme
Effect test

Embodiment A-H

[0041] Eight compositions were prepared by blending base polymers comprising a 1:1 blend of polyphenylene ether / styrene, polyolefin, and compatibilizer. The base polymer is Noryl  731 or Noryl  EN185 (sold by General Electric), where the "EN 185" blend contains a flame retardant. For compatibilizers, including polystyrene-ethylene-butadiene-styrene (SEBS) grade Kraton TM G2705 or G1651 (sold by Kraton Polymer). Finally, the polyolefin is linear low density polyethylene (LLPDE) (Petrothene GA818-07, sold by Equistar) or polyethylene / polypropylene (PE / PP) copolymer (C105-02, sold by Dow Chemical). Each composition contained 7.5 wt% or 15 wt% total polyolefin and compatibilizer in a 2:1 ratio of polyolefin to compatibilizer. The relative amounts of the components of each composition, designated A-H, are shown in Table 1.

[0042] Compositions were prepared by hand blending using Werner Pfleiderer ZSK-40 TM Extruded by twin-screw extruder, then pelletized. The extruded c...

Embodiment I

[0046] Compositions were prepared by the above method using 100% polystyrene as base polymer, 15% SEBS (Kraton G1651 ) as compatibilizer and 10% LLDPE as polyolefin. The wear data for the resulting compositions are shown in Table 1 and figure 1 . 3900 x 10 with pure polystyrene -11 mm 5 / Pa-m compared, the wear coefficient of composition I is 59×10 -11 mm 5 / Pa-m. This demonstrates that the friction properties of pure polystyrene can be improved by incorporating suitable polyolefins and compatibilizers.

Embodiment J-Q

[0048] A 1:1 polyphenylene ether / styrene blend was used as the base polymer (Noryl  731), SEBS (Kraton TM G1651) as compatibilizer and LLDPE (Petrothene GA818-07) as polyolefin 8 further compositions were prepared by the method described above. Each composition comprises between 2 and 30 wt% polyolefin, 0-6 wt% compatibilizer, the ratio of polyolefin to compatibilizer is from 30:0 to 2:1. The relative amounts of the ingredients of each composition are shown in Table 2. Properties were evaluated as previously described and are listed in Table 2, graphically shown in figure 2 middle.

[0049] Samples J, L, M, and N all contained 10% polyolefin, and increasing the concentration of compatibilizer from 0 to 5 wt%, all exhibited -11 mm 5 Favorable wear coefficient between / Pa-m. These samples also demonstrate that increasing the concentration of compatibilizer improves impact strength, as evidenced by an increase in the notched Izod value. Specifically, Noryl  The 731 ha...

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Abstract

Internally lubricated polymer compositions containing a styrene- and / or polyphenylene ether-containing polymer, an olefin-containing polymer, and a compatibilizer are provided. The olefin-containing polymer, which is present in the compositions in about 3 to about 30 weight percent, provides internal lubrication and improves the tribological properties of the compositions compared with the styreneor polyphenylene ether-containing polymer alone, as determined by wear measurements. Preferred compositions exhibit wear factors less than about 130 x 10<-11 >mm<5> / Pa-m. A preferred composition includes a blend of polystyrene / polyphenylene ether, linear low density polyethylene, and styreneethylene-butadiene-styrene. Methods are also provided for improving tribological properties of styrene- and / or polyphenylene ether-containing base polymers by incorporating into the base polymers at least one olefin-containing polymer and at least one compatibilizer, or by incorporating at least one substantially halogen-free internal lubricant.

Description

Background of the invention [0001] Traditionally, wear systems utilize external lubricants such as oils or greases to improve wear resistance and reduce frictional losses between moving contact surfaces of components in a tribological system. However, such external lubricants often must be replaced periodically and may be unevenly distributed over the wearing surfaces, leading to increased costs and ineffectiveness of the wear system. Additionally, in certain areas, such as food processing and photocopying, where product contamination is a concern, traditional external lubricants may not be ideal. [0002] Therefore, in many wear systems, it may be desirable to replace or eliminate external lubricants with internal lubricants in polymer components to improve tribological properties (such as wear resistance and frictional resistance). Internal lubricants can be used to reduce the coefficient of friction between polymer and metal surfaces, increase wear resistance, improve flow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L25/04C08L71/12C08L23/00C08L23/02C08L25/06C08L25/08C08L51/00C08L53/02
CPCC08L53/025C08L71/123C08L23/00C08L2205/02C08L25/08C08L2205/03C08L51/003C08L25/04C08L23/02C08L25/06C08L2205/035C08L71/12C08L2666/04C08L2666/02C08L2666/24
Inventor 保罗·M·阿特金森
Owner SHPP GLOBAL TECH BV
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