Polypropylene (PP), raws li cov khoom siv dav dav tshaj plaws -lub hom phiaj thermoplastic, cuam tshuam ncaj qha rau kev ntseeg tau thiab kev nyab xeeb ntawm cov khoom lag luam hauv qab vim nws qhov ua tau zoo ib yam. Tsim kom muaj cov txheej txheem kev tshawb fawb thiab cov qauv kev sim yog qhov tseem ceeb rau kev ua tiav qhov kawg -mus rau- xaus kev tswj hwm zoo los ntawm cov khoom siv raw mus rau cov khoom tiav. Cov txheej txheem kuaj PP suav nrog kev noj cov khoom siv raw, kev soj ntsuam cov txheej txheem tsim khoom, ua tiav cov khoom pov thawj kev ua tau zoo, thiab kev ntsuas kev hloov pauv ib puag ncig. Nws yuav tsum tau ua raws li cov qauv thoob ntiaj teb lossis lub teb chaws (xws li ISO, ASTM, GB) kom ntseeg tau cov ntaub ntawv raug thiab sib piv.
Kev ntsuam xyuas cov khoom siv raw yog qhov pib ntawm cov txheej txheem. Rau kev yuav PP resin lossis cov ntaub ntawv hloov kho, kev tshuaj xyuas qhov muag yuav tsum ua ntej kom paub meej tias cov granules yog xim tsis sib xws thiab tsis muaj qhov pom tsis zoo, plua plav, thiab cov strips ntev. Tom qab ntawd, cov khoom siv physicochemical tseem ceeb tau raug sim: Kev ntsuas Melt flow rate (MFR) (ISO 1133) tau siv los ntsuas kev ua haujlwm fluidity thiab xyuas kom haum nrog lub qhov rais txheej txheem; Fourier transform infrared spectroscopy (FTIR) lossis nuclear magnetic resonance (NMR) tau siv los txheeb xyuas cov qauv molecular thiab copolymerization hom (homopolymer, thaiv copolymer, lossis random copolymer) kom paub meej tias propylene rau ethylene monomer piv; Sib txawv scanning calorimetry (DSC) yog siv los txiav txim siab melting point thiab crystallinity los txiav txim seb isotacticity thiab thermal zog raws li specifications; Kev txiav txim siab cov ntsiab lus tshauv (ISO 3451) tau siv los txheeb xyuas cov ntsiab lus ntawm inorganic filler los tiv thaiv mis-admixture lossis ratio deviations. Yog tias tsim nyog, kev ntsuas molecular hnyav faib (GPC) tau ua los ntsuas qhov ruaj khov ntawm cov txheej txheem polymerization.
Kev soj ntsuam cov txheej txheem ntau lawm tau ua nyob rau hauv cov kev hloov kho thiab molding theem. Rau kev sib xyaw, sau, lossis kev hloov kho cov txheej txheem, tiag - lub sijhawm saib xyuas qhov kub thiab txias, ceev ceev, thiab pub tus nqi hauv txhua ntu ntawm extruder yuav tsum tau tiv thaiv kom tsis txhob muaj cua sov hauv cheeb tsam uas ua rau thermal degradation. Ua ntej txhua pawg ntawm cov khoom hloov kho tawm ntawm cov kab ntau lawm, cov qauv raug xaiv xaiv rau MFR pov thawj thiab cov khoom siv kho tshuab (lub zog tensile ISO 527, flexural modulus ISO 178, notched cuam tshuam lub zog ISO 179) kom ntseeg tau tias muaj kev sib txawv ntawm qhov hloov kho thiab ua raws li cov qauv kev ua haujlwm. Rau cov fiber ntau- txhawb nqa PP, fiber ntau qhov ntev thiab kev sib txuas ntawm lub ntsej muag kuj tau sim (kev soj ntsuam microscopic lossis SEM tsom xam) kom tsis txhob muaj cov ntsiab lus tsis muaj zog hauv cov khoom.
Kev ua tiav cov khoom pov thawj tiav yuav tsum muaj tag nrho cov kev ntsuas lub cev thiab cov cuab yeej cuab tam raws li tus qauv ib puag ncig. Ntxiv nrog rau qhov niaj hnub tensile, flexural, thiab cov kev ntsuam xyuas cuam tshuam, cov kev ntsuam xyuas tshwj xeeb tau ua raws li daim ntawv thov: kub distortion kub (HDT ISO 75) los ntsuas qhov siab - kub load- bearing peev; Rockwell hardness (ISO 2039) kom muaj kev cuam tshuam kev puas tsuaj rau saum npoo; nplaim retardancy ntsuam xyuas raws li UL94 los yog GB / T 2408; Cov khoom siv hluav taws xob (ntim qhov hluav taws xob IEC 60093, dielectric zog IEC 60243) kom muaj kev nyab xeeb hluav taws xob; thiab rau kev sib cuag zaub mov los yog daim ntawv thov kev kho mob, kev sim tsiv teb tsaws chaw (xws li tag nrho kev tsiv teb tsaws GB 31604, kev tsiv teb tsaws tshwj xeeb) thiab kev ntsuam xyuas biocompatibility yuav tsum tau. Rau pob tshab los yog electroplated PP, lub teeb transmittance (ISO 13468) thiab nto roughness (Ra) yuav tsum tau kuaj kom paub meej tias adaptability rau tom ntej ua.
Environmental adaptability assessment yog ib kauj ruam tseem ceeb hauv kev txheeb xyuas qhov kev ntseeg siab ntawm cov khoom hauv kev pabcuam. Kev ntsuas huab cua ua haujlwm siv xenon teeb kev laus (ISO 4892-2) lossis ultraviolet aging (ISO 4892-3), ua ke nrog thermal cycling (piv txwv li, -40℃txog 80 degree) thiab damp tshav kub laus (85℃/ 85% RH) los ntsuas qhov ua tau zoo ntawm lub teeb thiab cov khoom siv. Kev ntsuas tshuaj tiv thaiv muaj feem cuam tshuam rau cov qauv hauv cov kua qaub, alkalis, roj, lossis cov kuab tshuaj, ua ntu zus saib xyuas cov kev hloov pauv ntawm cov khoom zoo thiab cov cuab yeej cuab tam degradation los txiav txim siab siv cov xov xwm thiab cov concentration. Rau lub sij hawm ntev load-bearing Cheebtsam, creep and fatigue tests kuj yuav tsum tau simulate lifespan kev ua tau zoo nyob rau hauv lub tiag tiag kev nyuaj siab.
Kev ua cov ntaub ntawv thiab traceability yog qhov tseem ceeb sib npaug. Tag nrho cov txiaj ntsig kev xeem yuav tsum tau nkag mus rau hauv kev tswj hwm kev ua tau zoo, siv cov txheej txheem tswj xyuas cov txheej txheem (SPC) los txheeb xyuas cov xwm txheej thiab kho cov kev sib txawv tam sim ntawd. Txhua batch ntawm raw cov ntaub ntawv thiab cov khoom tiav yog tshwj xeeb txheeb xyuas, ua kom tag nrho traceability los ntawm kev xeem mus rau ntau lawm thiab daim ntawv thov, ua tau raws li cov kev cai thiab cov neeg siv khoom soj ntsuam cov cai.
Hauv cov ntsiab lus, kev sim cov txheej txheem rau polypropylene plastics yog ua raws li cov ntaub ntawv raw cov ntaub ntawv pov thawj, ua kom ntseeg tau los ntawm kev soj ntsuam cov txheej txheem ntau lawm, thiab nyob rau hauv qhov kev ua tiav ntawm cov khoom tiav thiab kev kuaj ib puag ncig. Ua ke nrog cov ntaub ntawv- tsav kev tswj hwm thiab kev taug qab, qhov no tsim muaj ntau-dimensional, multi- theem tswj kev sib raug zoo network. Cov txheej txheem no tsis tsuas yog ua kom ruaj khov thiab txhim khu kev qha ntawm PP cov ntaub ntawv tab sis kuj muab kev txhawb nqa zoo rau lawv daim ntawv thov hauv kev xav tau xws li ntim khoom, tsheb, hluav taws xob, thiab kev kho mob.