橡胶原材料知识-生胶篇-第八章 乙烯丙烯酸酯橡胶AEM-Vamac®

Mackintosh

橡胶原材料知识-生胶篇-第八章
乙烯丙烯酸酯橡胶
Ethylene acrylic elastomers-AEM-Vamac®

Vamac® ethylene acrylic elastomer (AEM) products are a comprehensive family of heat and fluid resistant elastomers for flexible applications ranging from hoses, dampers and boots to seals and gaskets. Vamac® provides significant performance advantages over low temperature ACM and HNBR grades, including better low temperature resistance and high temperature performance up to 175°C. Compared to HNBR substantial cost savings can be achieved.
Vamac® ethylene acrylic elastomers can be made into cured compounds that have excellent resistance to high temperatures and good resistance to automotive fluids such as transmission fluids and engine oils.
LOW-TEMPERATURE PERFORMANCE
The low-temperature performance of Vamac® surpasses that of most other heat- and oil-resistant polymers. Typical compounds are flexible at temperatures of -40℃(-40℉). For flexibility at even lower temperatures, plasticizers can be used.
RESISTANCE TO FLUIDS
; z: o( i0 P+ k5 A% S' \" AEnd products based on Vamac® have excellent resistance to hot oils and hydrocarbon- or glycol-based lubricants, transmission fluids, and power steering fluids. Low oil swell can be obtained with proper Vamac® grade selection and compounding.
/ C+ m& P, \( U: l7 s" e, xVamac® is not recommended for use in components immersed in gasoline or highly aromatic fluids, but can be used as a cover material in fuel line applications to reduce costs.
EXCELLENT VIBRATION DAMPING ABILITY
The high vibrational damping characteristic of Vamac® remains nearly constant over broad ranges of temperature, frequency and amplitude.
LOW FIRE/SMOKE HAZARD
; C1 k+ G4 b( ]Vamac® ethylene acrylic elastomer is not inherently resistant to burning. However, when properly compounded, a wire jacket of Vamac® will pass the demanding UL-44 vertical wire flame test, generating very low smoke compared to other flame-resistant materials and provide non-halogen off-gases in fire situations.
HIGH-TEMPERATURE DURABILITY
" J$ f& H- t: O$ `# jParts made with Vamac® retain elasticity and remain functional after continuous air-oven exposures. Typical times and temperatures are six weeks at 160℃(330℉),18months at 121℃(250℉) or five days at 204℃(400℉). Vamac® Ultra IP provides improved high-temperature durability (6 weeks at 175℃(347℉))
COMPRESSIVE STRESS RELAXATION
Vamac® compounds perform exceptionally well in seal and gasket applications and have shown good performance in engine oils out to 5000 hours at 150℃(302℉).
GRADE SELECTION CRITERIA
Basic Heat and Oil Swell Characteristics
/ {  R: x) m8 A) O# b! eCompounds based on Vamac® G and Vamac® DP typically exhibit IRM903 oil swell of 40-60%. If compounded appropriately, the polymer can withstand 6 weeks of continuous use at 175℃(347℉), maintaining 50% elongation. Vamac® is generally assigned an ASTM D2000/SAE200 rating of EG or EF.
2 w3 B, |7 D& l1 t2 ]$ m$ i3 l- w! R$ XFor Reduced Oil Swell
3 ?# U# m. }1 t3 Q4 BFor reduced oil swell, Vamac® GLS exhibits about one half the IRM903 oil swell of its G counterpart. However, its lower oil swell is accompanied by a reduction (by 7℃) in low-temperature flexibility.
For High-Temperature Dynamic Performance
% O6 e% V' u! }0 H! hCompounds with Vamac® GXF have improved tensile properties and dynamic fatigue resistance at elevated temperatures compared to Vamac® G. At 150℃, tensile strength, ultimate elongation are 12% higher; DeMattia fatigue results show over a 150% improvement. Cure times for Vamac® GXF are slightly longer, compression sets higher than Vamac® G.
  Z5 T. V3 u! L8 yFor Molding or Extrusion
Vamac® Ultra IP can vastly improve productivity through reduced mold fouling, scrap, improved hot tear resistance and cycle time compared with core Vamac® G product. With higher viscosity, Vamac® Ultra IP provides superior compound dispersion with a 1-pass mix and extruded profile stability.
3 k: x: Z/ r0 A$ u2 s9 G2 q' d& VFor Low-Temperature, Dynamic Performance
  n' d; s4 x" a, |( ^* IVamac® Ultra LT delivers low temperature flexibility down to -40℃ and lower in service with fewer performance-draining plasticizers, especially for use in automotive hoses and boots as well as dampers where functional performance is required throughout a thermal range as wide as -54℃ to 160℃.
Vamac® invites opportunities to help you formulate compounds to meet specific processing.
Curing Method
Diamine-cured terpolymer, Vamac® G, is used for most applications. If postcure is impractical or undesirable, Vamac® DP peroxide-cured dipolymer can be used.  
) T, q! ^5 V/ Q3 I4 j; R; O
5 }- _+ o+ r) qNote：The above from http://www.dupontelastomers.com.

mingtian

看不懂，英语水平太凹

navyxin

楼主是否可给翻译一下，难为兄弟门了

剑客小生

橡胶知识堂不错啊，谢谢
  ?( ~% u! U. o多支持啊

半百

没有翻译，看不懂。谁厉害试试。

wilson_wx

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ty0214

英语？oh,my god

于无声处

337900398

卤煮厉害～～

初学乍练Jim

支持学习