1. Kev laus hom ntawm cov ntaub ntawv polymer
Polymer cov ntaub ntawv nyob rau hauv tus txheej txheem ntawm kev ua, cia thiab siv, vim hais tias ntawm tag nrho cov kev txiav txim ntawm sab hauv thiab sab nraud yam, nws cov khoom maj mam deteriorate, thiaj li hais tias qhov kawg ntawm kev siv tus nqi, qhov tshwm sim no belongs rau cov laus cov ntaub ntawv polymer.
Qhov no tsis yog tsuas yog ua rau cov khoom siv pov tseg xwb, tab sis tseem ua rau muaj kev sib tsoo ntau dua vim nws txoj haujlwm tsis ua haujlwm, thiab cov khoom tawg los ntawm nws cov laus kuj tuaj yeem ua rau ib puag ncig.
Vim muaj ntau hom polymer thiab cov kev siv sib txawv, muaj qhov sib txawv ntawm kev laus thiab cov yam ntxwv.Feem ntau, kev laus ntawm cov ntaub ntawv polymer tuaj yeem muab faib ua plaub hom kev hloov pauv hauv qab no:
Kev hloov ntawm qhov tsos
Muaj stains, blotches, nyiaj kab, kab nrib pleb, frosting, hmoov, plaub hau, warping, fisheye, wrinkling, shrinkage, hlawv, kho qhov muag distortion thiab hloov nyob rau hauv optical xim.
Kev hloov ntawm lub cev muaj zog
Xws li solubility, o, rheological zog thiab txias tsis kam, kub tsis kam, dej permeability, huab cua permeability thiab lwm yam khoom ntawm kev hloov.
Kev hloov pauv hauv cov khoom siv kho tshuab
Lub zog tensile, khoov lub zog, shear zog, cuam tshuam lub zog, txheeb ze elongation, kev ntxhov siab so, thiab lwm yam.
Hloov cov khoom hluav taws xob
Xws li nto kuj, ntim kuj, dielectric tas li, hluav taws xob tawg zog hloov.
2. Cov khoom ua rau kev laus ntawm cov ntaub ntawv polymer
Vim hais tias nyob rau hauv cov txheej txheem polymer, cov txheej txheem siv, yuav raug cuam tshuam los ntawm tshav kub, oxygen, dej, lub teeb, kab mob thiab ib puag ncig yam xws li tshuaj nruab nrab ntawm nws cov tshuaj muaj pes tsawg leeg thiab cov qauv tuaj yeem tsim cov kev hloov pauv, cov khoom siv lub cev tsis zoo, xws li raws li cov plaub hau tawv, nkig, nplaum, discoloration, poob ntawm lub zog thiab lwm yam, cov kev hloov no thiab qhov tshwm sim yog hu ua kev laus.
High polymer nyob rau hauv qhov kev txiav txim ntawm tshav kub los yog lub teeb yuav tsim ib tug zoo siab molecules, thaum lub zog siab txaus, cov molecular saw yuav tawg mus ua dawb radicals, dawb radicals yuav tsim ib tug saw cov tshuaj tiv thaiv nyob rau hauv lub polymer, txuas ntxiv mus ua degradation, kuj yuav ua rau. kev sib txuas.
Yog tias muaj cov pa oxygen lossis ozone nyob hauv ib puag ncig, cov tshuaj tiv thaiv oxidation tuaj yeem raug ntxias los ua hydroperoxides (ROOH), uas tuaj yeem ua rau decomposed ntxiv rau hauv pawg carbonyl.
Yog hais tias muaj residual catalyst hlau ions nyob rau hauv lub polymer, los yog hlau ions xws li tooj liab, hlau, manganese thiab cobalt yog nkag mus rau hauv lub polymer thaum lub sij hawm ua thiab siv, oxidation degradation cov tshuaj tiv thaiv ntawm lub polymer yuav nrawm dua.
3. Cov txheej txheem los tiv thaiv kev laus ntawm cov ntaub ntawv polymer
Tam sim no, txoj hauv kev tseem ceeb los txhim kho thiab txhim kho cov khoom tiv thaiv kev laus ntawm cov ntaub ntawv polymer yog raws li hauv qab no:
Kev laus ntawm cov ntaub ntawv polymer, tshwj xeeb tshaj yog cov photooxygen aging, thawj zaug pib ntawm qhov chaw ntawm cov khoom los yog cov khoom, manifested li discoloration, hmoov, cracking, gloss poob, thiab ces maj mam mus rau sab hauv.
Cov khoom nyias nyias muaj peev xwm ua tsis tau sai dua li cov khoom tuab, yog li kev pabcuam lub neej ntawm cov khoom tuaj yeem txuas ntxiv los ntawm cov khoom thickening.
Txhawm rau kom yooj yim rau cov khoom laus, tuaj yeem coated rau saum npoo los yog coated nrog ib txheej ntawm cov huab cua zoo tiv thaiv txheej, los yog nyob rau hauv txheej txheej ntawm cov khoom sib xyaw txheej ntawm cov khoom siv huab cua zoo, kom lub ntsej muag ntawm cov khoom txuas nrog ib txheej. ntawm kev tiv thaiv txheej, thiaj li mus ncua lub aging txheej txheem.
Nyob rau hauv cov txheej txheem ntawm synthesis los yog npaj, ntau cov ntaub ntawv kuj muaj qhov teeb meem ntawm kev laus.Piv txwv li, cov nyhuv ntawm tshav kub nyob rau hauv cov txheej txheem polymerization, thermal oxygen laus hauv cov txheej txheem ua thiab lwm yam.Raws li, cov nyhuv ntawm cov pa tuaj yeem txo tau los ntawm kev ntxiv cov khoom siv deoxygenation lossis nqus cov khoom siv hauv cov txheej txheem polymerization lossis kev ua haujlwm.
Txawm li cas los xij, txoj kev no tsuas tuaj yeem lav qhov kev ua tau zoo ntawm cov khoom siv hauv lub hoobkas, thiab txoj kev no tsuas yog siv tau los ntawm qhov chaw ntawm cov khoom npaj, tsis tuaj yeem daws nws cov teeb meem kev laus hauv cov txheej txheem rov ua dua thiab siv.
Muaj cov pab pawg uas muaj hnub nyoog yooj yim heev hauv cov qauv molecular ntawm ntau cov ntaub ntawv polymer, yog li los ntawm cov qauv molecular tsim cov ntaub ntawv, hloov cov pab pawg uas tsis yooj yim rau hnub nyoog nrog cov pab pawg uas muaj hnub nyoog yooj yim feem ntau tuaj yeem ua tau zoo.
Los yog kev qhia txog cov pab pawg ua haujlwm lossis cov qauv uas muaj kev tiv thaiv kev laus ntawm cov saw hlau molecular polymer los ntawm grafting lossis copolymerization txoj kev, endowing cov khoom nws tus kheej nrog zoo heev los tiv thaiv kev laus muaj nuj nqi, kuj yog ib txoj kev uas feem ntau siv los ntawm cov kws tshawb fawb, tab sis tus nqi yog siab, thiab nws tsis tuaj yeem ua tiav kev tsim khoom loj thiab daim ntawv thov.
Tam sim no, txoj kev ua tau zoo thiab txoj hauv kev los txhim kho kev laus ntawm cov ntaub ntawv polymer yog ntxiv cov tshuaj tiv thaiv kev laus, uas yog siv dav vim nws cov nqi qis thiab tsis tas yuav hloov cov txheej txheem ntau lawm.Muaj ob txoj hauv kev los ntxiv cov tshuaj tiv thaiv kev laus no:
Direct ntxiv ntawm additives: anti-aging additives (hmoov los yog kua) thiab resin thiab lwm yam raw cov ntaub ntawv yog ncaj qha tov thiab stirred tom qab extrusion granulation los yog txhaj molding, thiab lwm yam. Vim nws txoj kev yooj yim, txoj kev ntxiv no yog dav siv nyob rau hauv ntau lub twj tso kua mis thiab lwm yam. txhaj tshuaj molding factories.
Anti-aging masterbatch ntxiv txoj kev: Hauv cov tuam txhab uas xav tau ntau dua rau cov khoom lag luam zoo thiab kev ruaj ntseg zoo, nws yog ntau dua ntxiv los tiv thaiv kev laus masterbatch hauv ntau lawm.
Anti-aging masterbatch yog tsim nyog cob raws li cov cab kuj, tov nrog ntau yam zoo los tiv thaiv kev laus additives, ces los ntawm ntxaib-ntsia hlau extruder co-extrusion granulation, nws daim ntawv thov zoo yog nyob rau hauv anti-aging additives nyob rau hauv tus txheej txheem ntawm kev npaj masterbatch ua ntej siv. Lub dispersed, yog li lig nyob rau hauv cov txheej txheem ntawm cov khoom ua, anti-aging tus neeg saib xyuas tau thib ob dispersion, kom ua tiav lub hom phiaj ntawm uniform dispersion ntawm auxiliaries nyob rau hauv lub polymer cov ntaub ntawv matrix, tsis tsuas yog los xyuas kom meej qhov zoo ntawm cov khoom stability, tab sis kuj yuav tsum tau zam. hmoov av muaj kuab paug thaum lub sij hawm tsim khoom, ua rau ntau lawm ntsuab thiab ib puag ncig tiv thaiv.
Post lub sij hawm: Aug-17-2022