1. Tus naj npawb viscosity
Tus naj npawb viscosity qhia txog qhov nruab nrab molecular hnyav ntawm cov cob thiab yog tus yam ntxwv tseem ceeb rau kev txiav txim siab hom resin. Cov khoom thiab kev siv ntawm cov resin sib txawv nyob ntawm qhov viscosity. Raws li qib ntawm polymerization ntawm PVC resin nce, txhua yam khoom xws li tensile lub zog, cuam tshuam lub zog, tawg lub zog, thiab elongation ntawm tawg nce, thaum lub zog tawm los txo. Cov txiaj ntsig kev tshawb fawb qhia tau hais tias raws li qib ntawm polymerization ntawm PVC ua cov khoom pab nce, cov yam ntxwv ntawm cov resin txhim kho, thaum kev ua haujlwm thiab kev coj tus cwj pwm tsis zoo. Nws tuaj yeem pom tias qhov hnyav molecular faib ntawm PVC resin muaj kev sib raug zoo nrog kev ua cov yas thiab cov khoom ua tau zoo.
2. impurity particle suav (dub thiab daj dots)
Cov impurity particles yog ib qho ntawm cov cim tseem ceeb rau kev ntsuam xyuas PVC resin. Lub ntsiab tseem ceeb cuam tshuam rau qhov ntsuas no yog: ua ntej, cov khoom seem ntawm cov phab ntsa txheej ntawm lub tshuab hluav taws xob polymerization tsis tau ntxuav kom huv si thiab cov khoom siv raw yog kis nrog impurities; thib ob, txhua yam hnav nrog impurities thiab kev ua haujlwm tsis raug coj hauv impurities; Nyob rau hauv cov txheej txheem ntawm kev ua cov yas, yog tias muaj ntau dhau impurity hais, nws yuav muaj kev cuam tshuam tsis zoo rau kev ua haujlwm thiab kev siv cov khoom siv PVC ua. Piv txwv li, nyob rau hauv kev ua thiab shaping ntawm profiles, muaj ntau impurities thiab hais, uas yuav ua rau me ntsis tshwm nyob rau saum npoo ntawm qhov profile, yog li txo cov tsos ntawm cov khoom. Tsis tas li ntawd, vim tsis muaj plasticization ntawm impurity hais los yog lub zog qis txawm tias plasticization, cov khoom siv kho tshuab ntawm cov khoom raug txo.
3. Volatiles (xws li dej)
Qhov ntsuas no qhia txog qhov poob phaus ntawm cov resin tom qab ua kom sov ntawm qhov kub thiab txias. Cov ntsiab lus tsis tshua muaj hluav taws xob tuaj yeem yooj yim tsim hluav taws xob zoo li qub, uas tsis tsim nyog rau kev ua haujlwm pub mis thaum ua thiab molding; Yog hais tias cov ntsiab lus volatile siab dhau lawm, cov resin nquag mus clumping thiab tsis zoo fluidity, thiab npuas yog yooj yim generated thaum molding thiab ua, uas muaj kev cuam tshuam tsis zoo rau cov khoom zoo.
4. Pom pom qhov ntom ntom
Qhov pom tseeb ntom yog qhov hnyav ib ntim ntawm PVC cov hmoov uas yog qhov tseem ceeb tsis yooj yim. Nws muaj feem xyuam rau particle morphology, qhov nruab nrab particle loj, thiab particle loj faib ntawm cov resin. Tsawg pom tseeb ntom ntom, ntim loj, nqus tau sai ntawm plasticizers, thiab ua haujlwm yooj yim. Ntawm qhov tsis sib xws, qhov nruab nrab qhov loj me me thiab qhov ntim me me ua rau kev nqus ntawm cov khoom siv hauv PVC. Rau kev tsim cov khoom lag luam nyuaj, qhov yuav tsum tau muaj qhov hnyav molecular tsis siab, thiab cov plasticizers feem ntau tsis ntxiv thaum ua. Yog li ntawd, lub porosity ntawm resin hais yuav tsum tau qis dua, tab sis yuav tsum muaj qhov yuav tsum tau rau qhov qhuav txaus ntawm cov resin, yog li qhov pom tseeb ntom ntawm cov resin yog ntau dua.
5. Plasticizer absorption ntawm resin
Qhov nqus tau ntawm PVC ua cov khoom pab cuam tshuam txog qib ntawm qhov pores hauv cov khoom siv cob, nrog cov roj nqus dej siab thiab cov porosity loj. Cov resin absorbs plasticizers sai sai thiab muaj kev ua haujlwm zoo. Rau extrusion molding (xws li profiles), txawm hais tias qhov yuav tsum tau rau resin porosity tsis siab dhau lawm, cov pores hauv cov khoom muaj cov nyhuv adsorption zoo ntawm kev ntxiv cov additives thaum lub sij hawm ua, txhawb kev ua hauj lwm ntawm additives.
6. Dawb
Lub whiteness qhia txog cov tsos thiab xim ntawm cov resin, nrog rau qhov degradation tshwm sim los ntawm cov thermal stability tsis zoo los yog lub sij hawm tuav lub sij hawm ntev, ua rau muaj qhov txo qis hauv cov xim dawb. Qib ntawm whiteness muaj qhov cuam tshuam loj rau kev laus ntawm cov ntoo thiab cov khoom.
7. Cov ntsiab lus vinyl chloride residual
VCM residue yog hais txog ib feem ntawm cov resin uas tsis tau adsorbed los yog yaj nyob rau hauv polyethylene monomer, thiab nws adsorption muaj peev xwm txawv nyob ntawm seb hom resin. Nyob rau hauv qhov tseeb VCM residue yam, lub ntsiab tseem ceeb muaj xws li kub saum toj kawg nkaus ntawm lub stripping ntauwd, siab sib txawv nyob rau hauv lub ntauwd, thiab tsis zoo resin particle morphology, tag nrho cov uas muaj peev xwm cuam tshuam rau VCM residue desorption, uas yog ib qho taw qhia rau kev ntsuas qhov kev tu cev ntawm cov khoom. resins. Rau cov khoom tshwj xeeb, xws li tin foil nyuaj pob tshab zaj duab xis ntim hnab rau cov kws kho mob, cov ntsiab lus ntawm VCM resin tsis yog raws li tus qauv (tsawg dua 5PPM).
8. Thermal stability
Yog hais tias cov dej ntsiab lus nyob rau hauv lub monomer yog siab dhau lawm, nws yuav tsim acidity, corrode cov khoom, tsim ib tug hlau polymerization system, thiab thaum kawg cuam tshuam lub thermal stability ntawm cov khoom. Yog hais tias hydrogen chloride los yog dawb chlorine muaj nyob rau hauv lub monomer, nws yuav muaj kev phiv los ntawm cov tshuaj tiv thaiv polymerization. Hydrogen chloride yog nquag tsim nyob rau hauv dej, uas txo cov pH nqi ntawm lub polymerization system thiab cuam tshuam rau stability ntawm lub polymerization system. Tsis tas li ntawd, cov ntsiab lus siab ntawm acetylene nyob rau hauv monomer ntawm cov khoom cuam tshuam rau thermal stability ntawm PVC nyob rau hauv lub synergistic nyhuv ntawm acetaldehyde thiab hlau, uas cuam tshuam rau kev ua tau zoo ntawm cov khoom.
9. Sieve residue
Lub sieve residue qhia txog qib ntawm qhov tsis sib xws ntawm qhov loj me ntawm cov resin, thiab nws cov ntsiab lus cuam tshuam tseem ceeb yog tus nqi ntawm cov dispersant hauv cov mis polymerization thiab cov nyhuv stirring. Yog hais tias cov resin hais yog ntxhib dhau los yog zoo heev, nws yuav cuam tshuam rau qib ntawm cov resin thiab tseem muaj kev cuam tshuam rau kev ua haujlwm tom ntej ntawm cov khoom.
10. "Ntses Ntses"
"Ntses qhov muag", tseem hu ua crystal point, hais txog pob tshab resin hais tias tsis tau plasticized nyob rau hauv ib txwm thermoplastic ua tej yam kev mob. Kev cuam tshuam hauv kev tsim khoom tiag. Lub ntsiab tseem ceeb ntawm "ntses qhov muag" yog tias thaum cov ntsiab lus ntawm cov khoom kub kub hauv monomer siab, nws dissolves cov polymer hauv cov khoom thaum lub sij hawm polymerization txheej txheem, txo cov porosity, ua rau cov khoom nyuaj, thiab dhau los ua ib ntus "ntses. qhov muag” thaum lub sij hawm ua plasticization. Tus thawj pib yog unevenly faib nyob rau hauv lub monomer roj droplets. Hauv cov txheej txheem polymerization nrog kev hloov pauv tsis sib xws, kev tsim cov resin nrog qhov hnyav molecular tsis sib xws, lossis qhov tsis huv ntawm lub reactor thaum pub mis, residual resin, lossis ntau dhau ntawm cov khoom siv reactor tuaj yeem ua rau "fisheye". Kev tsim ntawm "ntses ob lub qhov muag" ncaj qha cuam tshuam rau cov khoom zoo ntawm PVC, thiab tom qab ua tiav, nws yuav cuam tshuam rau qhov zoo nkauj ntawm cov khoom. Nws kuj tseem yuav txo tau cov khoom siv dag zog xws li tensile lub zog thiab elongation ntawm cov khoom, uas tuaj yeem yooj yim ua rau perforation ntawm cov yeeb yaj kiab yas lossis cov ntawv txheeb, tshwj xeeb tshaj yog cov khoom siv cable, uas yuav cuam tshuam rau lawv cov khoom hluav taws xob rwb thaiv tsev. Nws yog ib qho ntawm cov cim tseem ceeb hauv kev tsim cov resin thiab plasticization ua.
Post lub sij hawm: Jun-12-2024
