Kev Taw Qhia Txog Hydroxypropyl Methylcellulose (HPMC)
Hydroxypropyl methylcellulose, feem ntau hu ua HPMC, yog ib qho cellulose derivative hloov kho los ntawm cellulose ntuj. Nws yog dav siv rau hauv kev tsim kho, tshuaj, khoom noj thiab lwm yam lag luam, tshwj xeeb tshaj yog nyob rau hauv kev lag luam PVC. Cov tshuaj no yog ib qho hmoov dawb, tsis muaj ntxhiab nrog zoo heev solubility hauv dej thiab ntau yam khoom siv lub cev thiab tshuaj uas ua rau nws haum rau ntau yam kev siv.
Cov khoom rheological zoo dua:
Ib qho ntawm cov txiaj ntsig tseem ceeb ntawm HPMC rau kev lag luam PVC yog nws qhov cuam tshuam rau cov khoom rheological. Nws ua haujlwm ua tus hloov pauv rheology, cuam tshuam rau kev ntws thiab kev hloov pauv ntawm PVC cov tshuaj thaum lub sijhawm ua tiav. Qhov no tseem ceeb heev hauv cov txheej txheem extrusion thiab txhaj tshuaj molding.
Txhim kho PVC adhesion:
HPMC paub txog nws lub peev xwm los txhim kho kev nplaum, uas hauv kev lag luam PVC txhais tau tias kev sib txuas zoo dua ntawm PVC cov khoom sib xyaw thiab lwm yam khoom siv. Qhov no muaj txiaj ntsig zoo hauv kev tsim cov khoom sib xyaw PVC thiab kev sib xyaw, qhov twg kev nplaum zoo interfacial yog qhov tseem ceeb rau kev ua tau zoo tshaj plaws.
Kev khaws cia dej thiab kev ruaj khov:
Hauv cov qauv PVC, nws yog ib qho tseem ceeb kom tswj cov dej hauv cov theem tshwj xeeb thaum lub sijhawm ua tiav. HPMC ua haujlwm ua tus neeg sawv cev khaws dej, tiv thaiv kom qhuav ua ntej thiab xyuas kom meej cov dej sib xws. Qhov no tseem ceeb heev rau cov ntawv thov uas lub xeev hydration ntawm PVC compound cuam tshuam rau cov khoom ntawm cov khoom kawg.
Cov ntawv thov tso tawm tswj hwm:
HPMC feem ntau siv ua ke nrog PVC hauv cov qauv tswj kev tso tawm. Qhov no yog ib txwm muaj nyob rau hauv kev siv ua liaj ua teb qhov twg PVC cov txheej txheem siv los tswj kev tso tawm ntawm cov chiv lossis tshuaj tua kab. Cov yam ntxwv ntawm kev yaj tas mus li thiab kwv yees tau ntawm HPMC pab txhawb kev tso tawm tswj tau.
Kev cuam tshuam rau cov khoom ntawm PVC zaj duab xis:
Ntxiv HPMC rau hauv PVC cov qauv tuaj yeem cuam tshuam rau cov yam ntxwv ntawm cov yeeb yaj kiab uas tshwm sim. Qhov no suav nrog cov yam ntxwv xws li kev ywj pheej, pob tshab thiab lub zog kho tshuab. Nyob ntawm qhov xav tau tshwj xeeb ntawm cov khoom kawg, HPMC tuaj yeem hloov kho kom muab cov yeeb yaj kiab PVC cov yam ntxwv xav tau.
Kub thiab UV tsis kam:
Cov khoom PVC feem ntau yuav tsum tau tiv taus ntau yam xwm txheej ib puag ncig. HPMC txhim kho kev ua tau zoo ntawm PVC los ntawm kev ua kom nws tiv taus kev hloov pauv kub thiab UV hluav taws xob. Qhov no tseem ceeb heev rau cov ntawv thov sab nraum zoov uas PVC raug tshav ntuj thiab huab cua.
Cov khoom siv khi thiab cov neeg sawv cev rau kev ncua:
HPMC siv ua ib qho binder hauv PVC formulations, pab txhawb kev sib koom ua ke ntawm cov khoom me me thiab txhawb kev tsim cov pawg sib xws. Tsis tas li ntawd, nws ua haujlwm ua tus neeg sawv cev, tiv thaiv cov khoom me me los ntawm kev sib sau ua ke thiab xyuas kom meej tias muaj kev faib tawm sib npaug hauv PVC matrix.
Txhim kho qhov piv ntawm daim ntawv qhia zaub mov:
Qhov ua tau zoo ntawm HPMC hauv PVC daim ntawv thov feem ntau nyob ntawm cov qauv sib piv. Kev sib npaug ntawm qhov concentration ntawm HPMC nrog lwm cov khoom ntxiv thiab PVC resin yog qhov tseem ceeb rau kev ua tiav cov khoom xav tau ntawm cov khoom kawg.
Kev sib raug zoo nrog lwm cov khoom ntxiv:
Kev sib raug zoo nrog lwm cov khoom ntxiv, cov yas thiab cov stabilizers yog qhov tseem ceeb ntawm kev koom ua ke HPMC rau hauv PVC cov qauv. Kev ua kom ntseeg tau tias HPMC sib cuam tshuam nrog lwm cov khoom yog qhov tseem ceeb rau kev tswj hwm tag nrho kev ua tau zoo thiab kev ruaj khov ntawm PVC compound.
Cov xwm txheej ua tiav:
Cov xwm txheej ua haujlwm, suav nrog qhov kub thiab siab thaum lub sijhawm extrusion lossis molding, tuaj yeem cuam tshuam rau qhov ua tau zoo ntawm HPMC. Kev nkag siab txog kev ruaj khov thermal thiab cov kev cai ua haujlwm ntawm HPMC yog qhov tseem ceeb rau kev ua kom zoo dua cov txheej txheem tsim khoom.
xaus lus
Hauv kev xaus lus, hydroxypropyl methylcellulose ua lub luag haujlwm ntau yam hauv kev lag luam PVC, pab txhim kho cov yam ntxwv ua tiav, kev nplaum, kev khaws dej thiab kev ua tau zoo ntawm cov khoom siv PVC. Raws li kev lag luam txuas ntxiv hloov zuj zus, HPMC cov khoom tshwj xeeb yuav txuas ntxiv siv rau hauv cov ntawv thov tshiab thiab kev nce qib hauv PVC thev naus laus zis. Raws li cov kws tshawb fawb thiab cov chaw tsim khoom delve tob dua rau hauv kev sib koom ua ke ntawm HPMC thiab PVC, lub peev xwm rau cov qauv tshiab thiab cov khoom PVC zoo dua yog qhov loj heev.
Lub sijhawm tshaj tawm: Lub Kaum Ob Hlis-12-2023