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1、工程塑料聚酰胺尼龙资料（Engineeringplasticpolyamidenylonmaterial）Polyamide,commonlyknownasNylon,isknownasPolyamide(PA).polyamideIt'scallednylon.Aclassofthermoplasticresinscontainingamides(-conh-),includingaliphaticpolyamide,fatty-aromaticpolyamideandaromaticpolyamide,arefoundintherepetitivestructureun
2、itofthemainchain.Fattypolyamidevariety,largeyield,widelyused,canbeusedasafiber,alsocanbeplastic.Polyamidefiber,alsoknownasnylon,hasayieldratioof9to1forpolyamideplastics.Fatty-aromaticpolyamidevarietiesaresmallandyieldissmall.Aromaticpolyamideisoftenreferredtoaspolyamide,mainlyusedasfiber.T
3、helatteriscalledaromaticpolyamidefiber,commonlyknownasaramid.Polyamideisaflexiblekeratinoustranslucentormilkycrystallineresin.Itisoftenmadeintocylindricalpellets,andthepolyamidemolecularweightofplasticisgenerally15,000~20thousand.Thecommoncharacteristicsofallkindsofpolyamideisfireresistant
4、,hightensilestrength(104kpa),wearresistance,goodelectricalinsulation,heatresistance(thermaldeformationunder455kpatemperatureabove150℃),themeltingpointof150~250℃,themoltenresinhighliquidity,relativedensity1.05~1.15(addpackingcanbeincreasedto1.6),non-toxicmostly.However,whenthemonomercontent
5、intheresinistoohigh,itisnotsuitableforlong-termcontactwithskinorfood,whichisoftenstipulatedinfoodhygiene.Thedisadvantageisthatthemoistureabsorptionisstrong,thestorageandtransportationshouldavoidmoisture,andtheresinmustbedriedbeforeprocessing,otherwisetheproductscanproducebubblesorsurfacede
6、fects.Inaddition,insituationswherelight(heat)stability,dimensionstabilityandimpactstrengthareneeded,purepolyamidecannotmeettherequirementsandisusuallyresolvedbymodification.Historythefirstindustrialproductionofpolyamidevarietythepolyamide66(nylon66),theUnitedStatesdupontW.H.carothersannoun
7、cedin1937thefirstpatent,polyamide(nylon)samples,wasestablishedin1938,thepilotplant,industrialproductionunitin1939putintooperation.Atthattime,polyamidewasmainlyusedtoproducefiber,ropeandcoatingmaterials.Duringworldwarii,thematerialsusedinmilitaryapplicationswer
