Daim ntawv thov ruaj khov thiab dav ntawm acrylonitrile-butadiene-styrene copolymer (ABS) hauv ntau qhov chaw engineering yog los ntawm nws qhov tshwj xeeb molecular muaj pes tsawg leeg thiab ntau cov qauv, uas tsim nws lub hauv paus ua haujlwm. Lub hauv paus ua haujlwm no tsis tsuas yog txiav txim siab cov khoom siv cov khoom siv tshuab thiab thermal, tab sis kuj tseem txhawb nqa nws cov kev hloov kho, kev kho lub ntsej muag, thiab kev tiv thaiv ib puag ncig, yog li tsim cov txheej txheem kev ua tau zoo uas muaj peev xwm tuav cov kev ua haujlwm nyuaj.
Los ntawm kev pom molecular, ABS yog tsim los ntawm copolymerization ntawm peb monomers: acrylonitrile (A), butadiene (B), thiab styrene (S). Lub tsev acrylonitrile muaj ib pawg neeg muaj zog cyano, endowing cov khoom siv nrog lub zog siab, hardness, thiab tshuaj corrosion kuj, thaum tseem ua rau cov cua sov distortion kub, tso cai rau cov khoom kom tswj morphological thiab kev ua tau zoo stability nyob rau hauv siab -kub ib puag ncig. Chav tsev butadiene muaj nyob rau hauv daim ntawv ntawm cov ntu elastic lossis cov khoom siv roj hmab ywj pheej, ua kom muaj kev cuam tshuam zoo thiab ductility. Nyob rau hauv kev ntxhov siab, nws tuaj yeem nqus tau lub zog los ntawm kev tsim cov crazes thiab shear bands, tiv thaiv kev tawg sai sai. Chav tsev styrene muab cov qauv benzene rigidity, muab cov khoom zoo rigidity, nto gloss, thiab yooj yim - ntws yaj cov yam ntxwv, yooj yim rau molding ntawm complex duab thiab zoo nkauj tiav. Kev sib koom ua ke ntawm peb lub ntsiab lus ntawm qhov ntsuas molecular ua rau lub hauv paus ua haujlwm tseem ceeb ntawm ABS's "rigid- hloov pauv" cov khoom.
Nyob rau theem microscopic, ABS feem ntau tsim cov qauv multiphase nrog styrene -acrylonitrile copolymer (SAN) raws li cov theem txuas ntxiv thiab cov khoom siv roj hmab raws li cov theem tawg. Cov khoom siv roj hmab tau muab faib rau hauv cov tub ntxhais -plhaub morphology hauv SAN matrix. Lub plhaub txheej muaj kev sib raug zoo nrog cov matrix, zoo hloov kev ntxhov siab thiab ua rau cov yas deformation, yog li txhim kho tag nrho cov kev cuam tshuam. Cov qauv no tso cai rau cov khoom muaj ob qho tib si thauj khoom -cov kabmob muaj peev xwm thiab lub zog dissipation mechanisms nyob rau hauv sab nraud rog, uas yog lub hauv paus ntawm nws cov toughness siab. Los ntawm kev tswj cov roj hmab cov ntsiab lus, particle loj tis, thiab interfacial bonding xeev, qhov sib npaug ntawm rigidity, toughness, thiab tshav kub kuj yuav optimized nyob rau hauv ib tug tej yam ntau yam.
Lub hauv paus ua haujlwm tseem muaj kev cuam tshuam hauv nws tus cwj pwm thermal thiab ua cov lus teb. ABS muaj qhov sib txawv ntawm qhov kub thiab txias (kwv yees li 180{2}}240 degree), thiab nws cov viscosity yaj yog nruab nrab thiab ruaj khov, tso cai rau kev txhaj tshuaj molding, extrusion, thiab tshuab molding txheej txheem yuav tsum tau nqa tawm nyob rau hauv cov kev mob uas yuav tsum tau so, uas yog conducive rau siab -precision thiab siab - molding efficiency. Nws qhov tsawg kub shrinkage tus nqi txhim kho qhov sib xws ntawm cov khoom thiab txo qhov kev xav tau rau kev hloov kho tom qab.
Tsis tas li ntawd, ABS muaj lub zog nruab nrab ntawm lub zog, ua rau nws ua tau zoo rau cov hlau plating, coatings, thiab inks. Qhov no stems los ntawm complementary nto thaj chaw ntawm lub SAN matrix thiab cov roj hmab theem, muab ib tug haumxeeb hauv paus rau theem nrab ua. Nws qhov kev tiv thaiv ib puag ncig tshwm sim los ntawm cov tshuaj lom neeg ruaj khov ntawm acrylonitrile thiab deformation buffering peev xwm ntawm cov roj hmab theem, kom ntseeg tau tias kev ua haujlwm ruaj khov hauv av, oily, lossis tsis muaj zog acidic / alkaline ib puag ncig.
Zuag qhia tag nrho, lub hauv paus ua haujlwm ntawm ABS yog los ntawm kev sib koom ua ke ntawm cov tshuaj lom neeg ntawm nws cov ternary Cheebtsam thiab cov neeg kho tshuab ntxiv ntawm nws cov qauv multiphase. Ua ke nrog kev tswj cov lus teb thiab cov khoom saum npoo av, qhov no ua rau nws ob qho tib si txhim khu kev qha thiab tsim tau hauv ntau daim ntawv thov, ua rau nws yog ib qho khoom sawv cev nrog kev ua haujlwm zoo tshaj plaws ntawm engineering plastics systems.