Polycarbonate (PC), nrog rau nws cov pob tshab siab, kev cuam tshuam zoo heev, thiab kev ua kom sov zoo, yog siv dav hauv cov khoom siv hluav taws xob, kev tsim tsheb, khoom siv kho qhov muag, thiab kev tiv thaiv lub tsev. Txawm li cas los xij, cov teeb meem xws li hygroscopicity, kev ntxhov siab sab hauv, txwv cov tshuaj tiv thaiv, thiab bisphenol A tsiv teb tsaws thaum ua thiab siv feem ntau txwv nws cov kev ua tau zoo thiab kev nthuav dav. Txhawm rau daws cov teeb meem mob no, kev daws teeb meem yuav tsum tau tsim los ntawm ntau qhov ntev, suav nrog kev hloov kho cov khoom siv, kev ua kom zoo dua qub, thiab kev hloov pauv ntawm daim ntawv thov, txhawm rau qhib lub peev xwm ntawm PC.
Kev Hloov Kho Khoom Siv: Lub Hom Phiaj Tswj Kev Ua Haujlwm Ciam Tebchaws
The inherent defects of PC can be compensated for through blending, copolymerization, and filler modification. To achieve a balance between impact resistance and rigidity, it can be blended with acrylonitrile-butadiene-styrene copolymer (ABS) and polybutylene terephthalate (PBT) to form alloy materials-ABS improves toughness and reduces cost, PBT enhances chemical resistance and dimensional stability, and the processing flow of the blend is more suitable for molding complex parts. For optical applications, the introduction of methyl methacrylate (MMA) comonomers can reduce the bisphenol A (BPA) unit content, minimizing migration risk while maintaining high light transmittance (>90%) thiab qis haze (<1%), meeting food contact and medical device standards. Furthermore, nano-silica or carbon fiber fillers can improve the flame retardancy (reaching UL94 V-0 rating) and thermal conductivity of PC, expanding its application in new energy vehicle battery components.
Txheej Txheem Kev Ua Kom Zoo: Xaus-rau-Txoj Kev Tswj Xyuas Tsis Zoo Cov ntsiab lus mob hauv cov txheej txheem ua haujlwm yog tsom rau hydrolytic degradation, residual internal stress, thiab molding defects. Cov txheej txheem ua ntej- ziab qhuav siv lub kaw- lub voj dehumidification ziab kom ruaj khov tswj cov dej noo hauv qab 0.02%, ua ke nrog kev saib xyuas cov av noo hauv online txhawm rau tiv thaiv kev nqus noo noo vim qhov hloov pauv ib puag ncig. Thaum lub sij hawm molding, pwm kub ntawm 80-120℃yog precisely tswj siv lub pwm kub maub los. Ua ke nrog ntau- theem kev txhaj tshuaj nrawm thiab tuav lub siab nkhaus, cov kab txuas, kev sib tsoo, thiab kev ntxhov siab sab hauv raug txo qis (qhov kev ntxhov siab seem tuaj yeem txo tau ntau dua 60% tom qab annealing). Rau loj-cov ntawv loj extruded, lub tsho khuam lub tsho- hom tuag lub taub hau thiab ntau- ntu cua txias rau cov menyuam sib dhos yog siv, nrog rau kev ntsuas hauv online thickness ntsuas kev hloov kho, kom ntseeg tau tias thickness kam rau ua tsawg dua los yog sib npaug rau ± 0.05mm, ua tau raws li qhov xav tau ntawm optical-qib flatness.
Kev hloov pauv ntawm daim ntawv thov: Scenario-Raws li kev daws teeb meem los txo cov kev pheej hmoo sib txawv cov tswv yim yuav tsum tau tsim los daws cov kev xav tau tshwj xeeb ntawm cov ntawv thov sib txawv. Hauv kev sib cuag zaub mov, BPA- dawb lossis qis- qib PC raug xaiv, thiab txoj hauv kev tsiv teb tsaws raug thaiv los ntawm cov txheej txheej saum npoo (xws li siloxane coatings). Kev ntsuam xyuas kev tsiv teb tsaws nrawm yog siv los txheeb xyuas qhov ua raws. Hauv cov ntawv thov huab cua sab nraum zoov, qhov sib ntxiv ntawm cov hindered amine light stabilizers (HALS) thiab UV absorbers (xws li benzotriazoles) tso cai rau PC kom tswj tau ntau dua 85% lub teeb xa tawm tom qab 5000 teev ntawm QUV kev laus. Nyob rau hauv siab -load structural applications, fiber reinforcement thiab topology optimization tsim yuav ua rau kom lub flexural modulus ntawm PC mus txog 8 GPa. Finite element tsom xam yog siv los simulate kev nyuaj siab tis, tiv thaiv lub zos overload tsis ua hauj lwm.
Recycling thiab Regeneration: Ib qho kaw -Loop System txhim kho kev ruaj ntseg. Qhov kev sib tw hauv kev rov ua dua PC pov tseg yog nyob rau hauv kev txo qis molecular los ntawm thermal degradation. Los ntawm kev tsim "sorting-tu-granulation-adhesion" txheej txheem tsim dua tshiab thiab siv cov khoom siv-theem polycondensation (SSP) thev naus laus zis ntawm 180-220℃nyob rau hauv lub tshuab nqus tsev siab los kho cov saw hlau molecular ntawm 0% rov ua dua tshiab ntawm cov khoom siv molecular. cov ntaub ntawv nkauj xwb, ua tau raws li qhov yuav tsum tau ua rau cov khoom tsis yog{11}} qib kho qhov muag. Nyob rau tib lub sijhawm, txhawb kev siv tshuaj lom neeg depolymerization technologies (xws li methanol alcoholysis) kom rov qab tau bisphenol A thiab dimethyl carbonate yuav ua rau cov khoom siv raw khoom rov ua dua thiab txo qis kev vam khom ntawm cov roj av monomers.
Hauv cov ntsiab lus, cov kev daws teeb meem PC yuav tsum yog raws li cov ntaub ntawv kev tshawb fawb, kev sib koom ua ke ntawm cov txheej txheem kev tsim kho tshiab thiab kev siv tswv yim los daws cov ntsiab lus mob uas twb muaj lawm thaum npaj rau kev hloov pauv ntsuab. Tsuas yog nyob rau hauv txoj kev no tuaj yeem PC ua kom ruaj khov rau nws txoj haujlwm tseem ceeb raws li "tus qauv rau kev tsim khoom yas" raws li ob lub hom phiaj ntawm siab -kev tsim khoom thiab kev tsim kho kom ruaj khov.