Qhov tswv yeeb tseem ceeb ntawm kev tsav PVC: Tshuav lub cej thiab lub cej ntaus

PVC processors worldwide frequently encounter persistent production issues including rough product surfaces, additive blooming, yellow discoloration, low-temperature brittleness and fluctuating throughput. Most of these failures are not caused by equipment malfunction, but stem from poor dynamic balance between lubrication system and melt plasticization. Even minor changes in the ratio of internal and external lubricants will alter melt status, pushing up reject rates, energy consumption and unplanned downtime. This technical brief summarizes field-proven adjustment strategies for PVC lubrication formulation.

Internal and External Lubricants: Core Synergy Principles

The fundamental principle of PVC lubrication design lies in the coordinated use of internal and external lubricants while avoiding antagonistic effects.

✅ Internal Lubricants: Typical options include G60 powder, stearic acid, glyceryl monostearate thiab calcium stearate. Lawv no tshuas rau hauv PVC molecular chains kom txo cov friction ntawm cov molecules, txhawj kom plasticization yog tib yam, thiab pab kom melt flow zoo dua, xyuas cov teeb meem uas tsis plasticized zoo thiab tsis muaj fluidity zoo.

✅ External Lubricants: Paraffin wax, PE wax thiab oxidized polyethylene wax (OPE wax) ua rau cov film los ntawm melt thiab cov metal surfaces (screw, barrel, mould). Cov film no xaav cov material kom tsis muaj adhesion, tsoov plasticization, thiab tsw qhia thermal degradation thiab yellowing uas muaj los ntawm plasticization li ntau.

Nyob rau hauv qhov sib tw: Internal lubricants homogenize melting; external lubricants prevent sticking thiab scorching.

Txiav: EBS ua rau lub composite internal-external lubricant, uas muaj compatibility tib yam.

Maijisen :Advantages of Lubricants

MAIJISEN muab cov lubricants uas tau tsim rau PVC manufacturing, puas muaj calcium stearate, OPE wax uas nyob hauv qhov ceev, composite EBS thiab high-molecular PE wax thiab Internal lubricant G60.

Qhov lub tswv yim lubrication uas muaj qhov loj thiab tsis siv lub hluav tais tes rau qhov cua ntsa; qhov plasticization yuav tsoo tshaj plaws thaum muaj kev hloov qhov cua thiab kev hloov lub screw speed.

Qhov thermal stability zoo li cas thiab qhov volatility yooj yim rau lub hluav tais tes rau qhov cua siab thaum extrusion, uas txog kev txhawb kom tsis muaj kev tshuav rau lub mould thiab kev hlub yooj yim rau kev hloov li cas thaum ua haujlwm ntev.

Qhov compatibility zoo li cas rau Ca/Zn, lead salt thiab organotin stabilizers, uas txog kev txhawb kom tsis muaj kev blooming los ntawm kev ntxiv lub lubricity.

Qhov dispersion performance zoo li cas uas pab txog kev plasticization zoo li cas thaum muaj ntau cov khoom sib sau, uas pab txog kev ntxiv lub gloss ntawm cov khoom thiab kev ntxiv lub mechanical properties.

Cov lubricant formulas uas tau muab faib tshiab yog muaj nyob rau hauv kev txheeb xyuas kom haum thiab kom txog kev tshem tawm ntawm kev ua haujlwm.

Kev hloov cov formula nyob rau hauv kev ua haujlwm rau kev plasticization tsis zoo li cas

Yog tsum hloov lub lubricant raws li qhov cua hauv qhov chaw, lub screw speed thiab lub tshuab ua haujlwm tau dhau. Ob qho kev ua haujlwm tshwj xeeb rau kev saib xyuas hauv qhov chaw:

▷Plasticization ntau (cua hlub thiab ntau, lub motor sib sau siab)

Ntxiv cov lubricants hauv qhov ntsuas (paraffin / OPE wax: 0.1–0.3 phr) lossis txo lub lubricant hauv qhov ntsuas los ntshai kev plasticization.

▷Plasticization tsis ntau (qhov ntsuas tsis zoo, tsis muaj kev fluidity ntawm melt)

Ntxiv 0.2–0.5 phr calcium stearate rau hauv ACR processing aids los txhawj kev plasticization zoo li cas.

Cov lus qhia txog kev siv :Siv OPE wax uas muaj kev nyob rau hauv qhov cua sov siab los siv rau kev siv hauv qhov cua sov siab kom tsis muaj kev volatilization ntawm lubricant. Ntxiv lub lubricant hauv qhov ntsuas rau kev extrusion hauv qhov cua sov yam ntev kom muaj kev nyab xeeb ntawm melt.

Cov lus qhia txog kev paub thiab kev tswj xyuas: Qhov ntsuas tsis zoo → ntxiv cov lubricant hauv qhov ntsuas; mould blooming & surging → txo lub lubricant hauv qhov ntsuas thiab los ntawd lossis muab lub EBS internal-external lubricant uas muaj kev sib koom zoo dua.

Kev saum xyuas ntawm kev plasticization los ntawm 5 qhov cim

Cov neeg siv yuav tuaj yeem paub kev plasticization tsis tau siv cov khoom siv hauv laboratorie.

① Kev puav qhia ntawm kev thaw: Qhov puav qhia zoo thiab sib xws = kev plasticization zoo; qhov puav qhia tsis zoo = kev plasticization tsis ntau; qhov puav qhia ntsuag thiab tsis muaj txiaj ntsig = kev plasticization ntau thiab kev tshuav los ntawm kev ntxhov.

② Lub tshuab siv: Qhov kev kov yeeb ntawm kev txhawb thiab kev pib ntawm lub cev tshuab yog qhov tshuaj cim tias lub tshuab tsis sib xws rau kev siv lub tshuab siv.

③ Lub tshuab uas tau ua lawm: Qhov kev kov yeeb thiab qhov puav qhia tsis zoo = kev siv lub tshuab siv tsis ntau; qhov kab mob, qhov ntsuag thiab qhov dub = kev tshuav los ntawm kev ntxhov.

④ Lub tshuab siv kom paub: Kev siv DSC thiab kev paub qhov ntsuag tuaj yeem pab paub qhov kev plasticization zoo tshaj plaws.

Lub tshuab siv thiab cov phooj ywg uas yuav tshwm.

1.Kev coj lub tshuab siv: 1 -siv lub tshuab siv 3 phr rau cov tshuab PVC uas yuav siv tau. Siv ntau yuav pab kev kov yeeb thiab kev tsis zoo ntawm kev txhawb thiab kev kov yeeb.

2.Lub tshuab siv uas muaj nyob hauv lub tshuab siv: Lub tshuab siv lead salt thiab calcium-zinc muaj kev siv lub tshuab siv nyob hauv nws. Kev siv ntawd yuav tsum tau suav rau hauv kev suav lub tshuab siv kom tsis ntau. -kev siv lub tshuab siv ntau.

3.Kev tswj hwm yuav tsum ua raws li kev tswj hwm ntawm qhov chaw: Tsis txhob muab ntau dua 0.2 phr rau ib qho lub lubricant ntawm qhov chaw. Yuav tsum rov ua dua tom qab qhov chaw tau tswj hwm zoo. Tsis txhob muab ntau dua rau lub formula.

4.Kev tswj hwm raws li qhov xyoos: Muab ntau dua lub lubricant ntawm qhov chaw rau hli hli; muab ntau dua lub lubricant hauv qhov chaw rau hli ntsuab kom lub PVC tau sib npaug zoo.

Kev xaiv lub lubricant uas muaj peb lub npe thiab muaj kev tswj hwm zoo los ntawm MAIJISEN yuav pab tshem tawm kev tswj hwm ntawm lub formula. Lub lubricant uas muaj kev tswj hwm zoo yuav pab tshem tawm kev tswj hwm ntau dua thiab pab tshem tawm kev tswj hwm ntawm lub production.

Txog MAIJISEN

MAIJISEN nyob rau hauv kev tham, kev tsim, thiab kev tswj hwm lub lubricant kom muaj kev tswj hwm zoo rau lub PVC extrusion thiab thiab kev tsim lub injection rau cov neeg tsim hauv lub ntiaj teb.