Kev cuam tshuam ntawm Cov Hluav Taws Xob Hluav Taws Xob rau cov khoom siv PVC: Kub Resistance, Processability, Transparency

Daim ntawv no tshawb xyuas seb cov cua sov stabilizer cuam tshuam li cas rau PVC cov khoom, tsom rauThaum tshav kub kub kuj, processability, thiab transparency. Los ntawm kev txheeb xyuas cov ntaub ntawv thiab cov ntaub ntawv sim, peb tshuaj xyuas kev sib cuam tshuam ntawm cov khoom siv hluav taws xob thiab cov khoom siv PVC, thiab lawv zoo li cas thermal stability, kev tsim khoom yooj yim, thiab cov khoom siv kho qhov muag.

1. Taw qhia

PVC yog siv dav siv thermoplastic, tab sis nws cov thermal instability txwv kev ua.Thaum tshav kub kub stabilizerstxo qis degradation thaum kub siab thiab tseem cuam tshuam rau kev ua tau zoo thiab pob tshab-tseem ceeb rau cov ntawv thov xws li ntim khoom thiab cov yeeb yaj kiab architectural.

2. Thaum tshav kub kub ntawm Stabilizers hauv PVC

2.1 Stabilization Mechanisms

Sib txawv stabilizers (lead-raws li,calcium - zinc, organotin) siv cov kev sib txawv:

Lead-based: React nrog labile Cl atoms nyob rau hauv PVC chains kom ruaj khov complexes, tiv thaiv degradation.
Calcium - zinc: Ua ke acid - khi thiab radical - scavenging.
Organotin (methyl / butyl tin): Koom tes nrog cov saw hlau polymer los tiv thaiv dehydrochlorination, ua kom muaj txiaj ntsig zoo.

2.2 Kev Ntsuam Xyuas Thermal Stability

Kev tshuaj ntsuam xyuas thermogravimetric (TGA) qhia tau hais tias organotin - stabilized PVC muaj ntau dua qhov pib degradation temps dua li cov tshuaj calcium - zinc systems. Thaum cov hlau lead-raws li stabilizers muaj kev ruaj ntseg ntev hauv qee cov txheej txheem, kev txhawj xeeb ntawm ib puag ncig / kev noj qab haus huv txwv tsis pub siv.

3. Cov Txheej Txheem Ua Haujlwm

3.1 Melt Flow & Viscosity

Stabilizers hloov PVC lub yaj cwj pwm:

Calcium - zinc: Tej zaum yuav nce yaj viscosity, cuam tshuam extrusion / txhaj molding.
Organotin: Txo cov viscosity kom smoother, qis dua - temp processing - zoo tagnrho rau high-ceev kab.
Lead-based: Nruab nrab yaj ntws tab sis nqaim ua qhov rais vim phaj - tawm kev pheej hmoo.

3.2 Lubrication & Pwm tso tawm

Qee cov stabilizers ua cov roj nplua nyeem:

Calcium - zinc formulations feem ntau suav nrog cov roj nplaum sab hauv los txhim kho cov pwm tso tawm hauv kev txhaj tshuaj molding.
Organotin stabilizers boost PVC - additive compatibility, indirectly pab processability.

4. Kev cuam tshuam rau pob tshab

4.1 Kev sib cuam tshuam nrog cov qauv PVC

Transparency nyob ntawm stabilizer dispersion hauv PVC:

Zoo – dispersed, me me – particle calcium – zinc stabilizers txo lub teeb tawg, khaws cia clarity.
Organotin stabilizersintegrate rau hauv PVC chains, txo optical distortions.
Lead - raws li stabilizers (loj, tsis sib npaug ntawm cov khoom) ua rau lub teeb tawg hnyav, txo qhov pom tseeb.

4.2 Hom Stabilizer & Transparency

Cov kev tshawb fawb sib piv qhia tias:

Organotin - stabilized PVC zaj duab xis ncav cuag> 90% lub teeb transmittance.
Calcium - zinc stabilizers tawm los ~ 85-88% transmittance.
Lead-based stabilizers ua haujlwm tsis zoo.

Cov teeb meem xws li "ntses ob lub qhov muag" (khi rau stabilizer zoo / dispersion) kuj txo cov clarity - siab - zoo stabilizers txo cov teeb meem no.

5. Cov lus xaus

Thaum tshav kub kub stabilizers yog ib qho tseem ceeb rau PVC ua, shaping tshav kub tsis kam, processability, thiab transparency:

Lead-based: Muab stability tab sis fim ib puag ncig backlash.
Calcium - zinc: Eco – friendlier tab sis xav tau kev txhim kho hauv kev ua haujlwm / pob tshab.
Organotin: Excel thoob plaws txhua qhov tab sis ntsib tus nqi / kev tswj hwm teeb meem hauv qee thaj tsam.

Cov kev tshawb fawb yav tom ntej yuav tsum tsim cov stabilizers ntsuas kev ruaj khov, kev ua haujlwm zoo, thiab kho qhov muag kom tau raws li kev lag luam xav tau.