Hloov kho cov yas PC + ABS yog cov khoom siv sib xyaw ua tau zoo tau txais los ntawm kev sib xyaw, alloying, thiab kev hloov kho kev ua haujlwm, feem ntau yog tsim los ntawm polycarbonate (PC) thiab acrylonitrile-butadiene-styrene copolymer (ABS). Nws cov txheej txheem npaj yuav tsum muaj qhov sib npaug ntawm qhov sib npaug ntawm cov molecular compatibility, theem qauv tswj, thiab kev ua tau zoo ntawm kev ua tau zoo kom ua tiav kev sib xyaw ua ke ntawm cov cua sov thiab lub zog siab ntawm PC thiab lub zog thiab kev ua haujlwm ntawm ABS. Cov txheej txheem kev npaj sib txawv ncaj qha cuam tshuam rau microstructure, mechanical zog, thiab daim ntawv thov tsim nyog ntawm cov khoom, yog li muaj kev taw qhia tseem ceeb hauv kev tsim khoom thiab R & D.
Txoj kev npaj tseem ceeb tuaj yeem muab faib ua ob pawg tseem ceeb: kev sib xyaw lub cev thiab rov ua kom muaj zog. Kev sib xyaw lub cev muaj xws li kev sib cais ntawm PC thiab ABS resins los ntawm kev sib xyaw ua ke hauv qhov sib piv tau ua ntej. Cov txheej txheem no yog qhov yooj yim thiab haum rau loj - nplai txuas ntxiv. Tus yuam sij rau txoj kev no yog nyob rau hauv kev sib raug zoo kev kho mob thiab dispersion tswj: txawm hais tias PC thiab ABS yog ib feem sib xws, ncaj qha blending yooj yim ua rau theem kev sib cais qauv, ua rau muaj kev hloov pauv ntawm kev ua haujlwm. Yog li ntawd, compatibilizers (xws li styrene-acrylonitrile-glycidyl methacrylate copolymer) los yog ua ntej- cov txheej txheem tshuaj tiv thaiv feem ntau tau qhia los hloov kho qhov cuam tshuam ntawm ob theem ua ntej sib tov, yog li txhim kho interfacial adhesion thiab tsim cov khoom zoo, thiab ruaj khov 'phase dispersed. nruj.
Reactive alloying qhia cov pab pawg reactive thaum lub sij hawm sib tov, ua rau PC thiab ABS mus rau grafting los yog hla -txuas cov tshuaj tiv thaiv nyob rau hauv lub xeev molten, tsim ib tug chemically bonded copolymer network. Txoj kev no tuaj yeem txhim kho kev sib raug zoo ntawm ob theem, tau txais ib qho kev sib txuam ntau dua microstructure, thiab yog li txhim kho thermal stability thiab mechanical zog. Piv txwv li, cov neeg pib peroxide tuaj yeem siv los txhawb cov tshuaj tiv thaiv ntawm butadiene ob daim ntawv cog lus hauv ABS thiab PC kawg pawg, los yog kev ua haujlwm monomers uas muaj epoxy thiab carboxyl pawg tuaj yeem muab ntxiv rau hauv lub cev los koom rau hauv cov tshuaj tiv thaiv ntawm qhov kub thiab txias, tsim ib qho kev sib tshuam lossis ib nrab -interpenetrating network qauv. Qhov kom zoo dua ntawm txoj kev no yog tias nws tuaj yeem tswj hwm lub xeev alloy theem, tab sis lub qhov rais txheej txheem yog nqaim, thiab cov kev cai rau kev tswj qhov kub thiab txias, shear rate, thiab additive ratio yog siab dua.
Ntxiv nrog rau kev sib xyaw ua ke thiab kev sib xyaw ua ke, kev hloov kho kev ua haujlwm kuj yog ib qho tseem ceeb hauv kev npaj ntawm PC + ABS. Rau cov nplaim hluav taws kub nyhiab, bromine-raws li, phosphorus-raws li, los yog halogen-cov nplaim hluav taws xob dawb tuaj yeem qhia tau, thiab cov neeg sib koom ua ke tuaj yeem siv los ua kom zoo dua cov nplaim hluav taws kub thiab thermal stability. Rau qhov yuav tsum tau ua kom muaj zog, iav fibers, carbon fibers, los yog mineral fillers yuav muab ntxiv los txhim kho rigidity, kub distortion kub, thiab seem stability; Txawm li cas los xij, cov neeg ua haujlwm sib txuas yog xav tau los txhim kho kev sib txuas ntawm kev sib txuas thiab tiv thaiv fiber ntau agglomeration ua rau kev ua haujlwm tsis zoo. Kev hloov pauv huab cua muaj xws li ntxiv cov hindered amine lub teeb stabilizers, UV absorbers, thiab lwm yam additives kom qeeb cov laus ntawm cov khoom nyob rau hauv lub teeb thiab ntub dej.
Hais txog kev siv thev naus laus zis, PC + ABS feem ntau yog yaj- sib tov siv tus ntxaib- ntsia hlau extruder. Kev sib xyaw ua ke ntawm cov ntsia hlau yuav tsum sib npaug dispersion thiab shearing kom ntseeg tau tias cov khoom siv sib xws thiab tiv thaiv kom tsis txhob muaj cua sov hauv cheeb tsam thiab degradation. Kev noj zaub mov, qhov kub thiab txias (feem ntau tswj ntawm 230-260 degree), ntsia hlau ceev, thiab lub sijhawm nyob txhua qhov yuav tsum tau hloov kho raws li cov qauv tsim kom sib npaug dispersion thiab thermal keeb kwm tswj. Tom qab granulation, ziab yuav tsum tau ua ntej siv rau hauv kev txhaj tshuaj molding, extrusion, thiab lwm yam txheej txheem molding theem kom tsis txhob muaj hydrolysis los yog npuas tsis xws luag los ntawm noo noo.
Zuag qhia tag nrho, kev npaj ntawm PC + ABS yog ib qho kev ua haujlwm sib txuas cov ntaub ntawv kev tshawb fawb, tshuaj tiv thaiv engineering, thiab kev siv thev naus laus zis. Lub cev sib xyaw yog paub txog nws txoj kev lag luam thiab kev ua kom muaj peev xwm, thaum reactive alloying muaj qhov zoo nyob rau hauv cov nqe lus ntawm kev ua tau zoo qab nthab thiab cov qauv sib xws. Los ntawm kev sib txuas ua haujlwm hloov kho nrog precision machining tswj, cov qib sib txawv xws li cov cua sov-resistant, siab-lub zog, nplaim taws-retardant, reinforced, los yog huab cua-cov ntaub ntawv tiv taus tuaj yeem kho kom tau raws li cov kev xav tau nruj ntawm tsheb, hluav taws xob, khoom siv kho mob, thiab cov khoom siv ua haujlwm siab {{7}.