ABS
Kev ua haujlwm ntawm ABS
ABS yog tsim los ntawm peb cov tshuaj monomers acrylonitrile, butadiene thiab styrene. Los ntawm qhov kev xav ntawm morphology, ABS yog cov khoom siv uas tsis yog siv lead ua, nrog cov neeg kho tshuab siab thiab qhov zoo "muaj zog, tawv, steel" kev ua tau zoo. Nws yog ib qho amorphous polymer, ABS yog cov yas yas, nws muaj ntau yam, siv dav, tseem hu ua "general yas", ABS yog ib qho yooj yim nqus dej noo, tshwj xeeb lub ntiajteb txawj nqus yog 1.05g / cm3 (me ntsis hnyav dua li dej), tsawg shrinkage. tus nqi (0.60%), ruaj khov loj, yooj yim molding ua.
Cov yam ntxwv ntawm ABS feem ntau yog nyob ntawm qhov piv ntawm peb lub monomers thiab cov qauv molecular ntawm ob theem. Qhov no tso cai rau kev hloov pauv zoo hauv cov khoom tsim, thiab yog li tsim ntau pua ntawm cov khoom zoo ABS sib txawv ntawm lub khw. Cov ntaub ntawv zoo sib txawv no muab cov yam ntxwv sib txawv, xws li qhov nruab nrab mus rau qhov muaj kev cuam tshuam siab, qis mus rau siab tiav thiab kub distortion yam ntxwv. ABS cov khoom muaj kev ua tau zoo heev, cov yam ntxwv zoo li, tsis tshua muaj kev nkag siab, kev ruaj ntseg zoo thiab muaj zog muaj zog.
ABS yog lub teeb daj granular lossis hlaws opaque resin, tsis muaj tshuaj lom, tsis qab, tsis muaj dej nqus, muaj cov khoom zoo ntawm lub cev thiab cov khoom siv, xws li cov khoom siv hluav taws xob zoo, hnav tsis kam, qhov ruaj khov, tshuaj tiv thaiv thiab gloss, thiab yooj yim rau txheej txheem thiab daim ntawv. Disadvantages yog huab cua tsis kam, tshav kub tsis kam, thiab flammable.
Cov txheej txheem ntawm ABS
ABS muaj siab hygroscopiness thiab humidity rhiab heev. Nws yuav tsum tau qhuav tag nrho thiab preheated ua ntej tsim thiab ua (qhuav ntawm 80 ~ 90C rau tsawg kawg 2 teev), thiab cov ntsiab lus noo noo tswj tau qis dua 0.03%.
Lub yaj viscosity ntawm ABS resin tsis tshua muaj siab rau qhov kub thiab txias (sib txawv ntawm lwm cov amorphous resins). Txawm hais tias qhov kev txhaj tshuaj kub ntawm ABS yog me ntsis siab dua li ntawm PS, nws tsis tuaj yeem muaj qhov sov sov zoo li PS. Lub viscosity ntawm ABS tsis tuaj yeem txo los ntawm qhov muag tsis pom cua sov. Lub peev xwm ntawm ABS tuaj yeem txhim kho los ntawm kev ua kom nrawm ntawm cov ntsia hlau lossis kev txhaj tshuaj. Kev ua haujlwm dav dav hauv 190-235 ℃ yog qhov tsim nyog.
Lub melting viscosity ntawm ABS yog nruab nrab, siab dua li ntawm PS, HIPS thiab AS, thiab kev txhaj tshuaj siab dua (500-1000 bar) yog xav tau.
ABS cov khoom nrog nruab nrab thiab siab txhaj tshuaj muaj txiaj ntsig zoo dua. (tshwj tsis yog tias cov duab yog complex thiab nyias-phab ntsa qhov yuav tsum tau txhaj tshuaj ntau dua), cov khoom yog ib qho yooj yim los tsim cov roj kab ntawm lub qhov ncauj.
ABS molding kub yog siab, nws cov pwm kub feem ntau yog kho ntawm 25-70 ℃. Thaum tsim cov khoom loj, cov pwm ruaj khov (pem hauv ntej pwm) qhov kub thiab txias yog feem ntau me ntsis siab dua li cov pwm txav (sab nraub qaum) txog 5 ℃ yog qhov tsim nyog. (Pwm kub yuav cuam tshuam rau qhov kawg ntawm cov khoom yas, qhov kub thiab txias yuav ua rau kom qis tiav)
ABS yuav tsum tsis txhob nyob twj ywm hauv qhov kub siab ntev ntev (tsawg dua 30 feeb), txwv tsis pub nws yooj yim rau decompose thiab daj.
Hom kev thov ntau yam
Automotive (strument panels, tool hatch doors, log covers, reflector boxes, etc.), fridges, high-strength tools (hair dryers, mixers, food processors, lawn mowers, etc.), xov tooj casings, ntaus ntawv ntaus ntawv, tsheb ua si xws li raws li lub tsheb golf thiab dav hlau sledges thiab lwm yam.
PMMA
Kev ua haujlwm ntawm PMMA
PMMA yog amorphous polymer, feem ntau hu ua plexiglass. Cov pob tshab zoo heev, kev ua haujlwm kub zoo (qhov kub thiab txias deformation ntawm 98 ℃), nrog rau cov yam ntxwv zoo tiv thaiv, nws cov khoom ntawm nruab nrab txhua yam muaj zog, tsis tshua muaj qhov tawv tawv, yooj yim rau khawb los ntawm cov khoom tawv thiab tawm cov kab, piv nrog PS, tsis yooj yim rau tawg, lub ntiajteb txawj nqus ntawm 1.18g / cm3. PMMA muaj cov khoom siv kho qhov muag zoo thiab huab cua tsis kam. Kev nkag mus ntawm lub teeb dawb yog siab li 92%. PMMA cov khoom muaj tsawg heev birefringence, tshwj xeeb tshaj yog haum rau zus tau tej cov video discs. PMMA muaj cov yam ntxwv ntawm qhov kub thiab txias. Nrog rau qhov nce ntawm kev thauj khoom thiab sijhawm, kev ntxhov siab tawg tuaj yeem tshwm sim.
Cov txheej txheem ntawm ABS
PMMA cov kev xav tau nruj dua, nws yog qhov rhiab heev rau cov dej thiab qhov kub thiab txias, ua ntej ua kom qhuav tag nrho (pom zoo kom qhuav ntawm 90 ℃, 2 mus rau 4 teev), nws cov viscosity yaj yog loj dua, yuav tsum tau tsim ntawm qhov siab (225). -245 ℃) thiab siab, tuag kub hauv 65-80 ℃ yog zoo dua. PMMA tsis ruaj khov, thiab degradation tuaj yeem tshwm sim los ntawm qhov kub thiab txias los yog nyob ntev ntev ntawm qhov kub siab. Cov ntsia hlau ceev yuav tsum tsis txhob loj heev (60% los yog li ntawd), tuab PMMA qhov chaw yog ib qho yooj yim mus tshwm "kab noj hniav", yuav tsum tau siv lub rooj vag loj, "tsawg khoom kub, siab tuag kub, qeeb ceev" txoj kev txhaj tshuaj rau txheej txheem.
Hom kev thov ntau yam
Automotive kev lag luam (cov khoom siv teeb pom kev zoo, ntsuas vaj huam sib luag thiab lwm yam), kev lag luam tshuaj (lub thawv ntim ntshav thiab lwm yam), daim ntawv thov kev lag luam (video disc, lub teeb scatterer), cov khoom siv (khoom haus, ntawv sau thiab lwm yam).
Post lub sij hawm: 23-11-22