I. Qhov tseem ceeb ntawm kev yuav khoom thiab kev ntsuas ntsuas qhov ntev
1. Carrier Resin Compatibility
Homogeneous/Specialized Carrier (Zoo Siab Pom Zoo): Siab -zoo PET masterbatches yuav tsum siv tus nqi zoo nkauj qis-viscosity lossis hloov PET polyester ua tus nqa khoom. Qhov no ua kom 100% compatibility nrog lub hauv paus cob yam tsis muaj kev cuam tshuam lub zog txhua yam lossis kho qhov muag ntawm cov khoom tiav.
Intrinsic Viscosity (IV) Matching:
Tus neeg nqa khoom tus nqi IV yuav tsum raug xaiv raws li qhov kawg - siv daim ntawv thov. Feem ntau, IV qis (piv txwv li, 0.55–0.65 dL / g) raug xaiv los pab txhawb cov xim zoo dua ntub thiab tawg; Txawm li cas los xij, IV yuav tsum tsis txhob qis dhau, vim qhov no yuav dilute lub viscosity ntawm lub hauv paus cob.
Cov khoom txwv tsis pub: Kev siv qis- melting- taw tes, qis- molecular- hnyav waxes (xws li PE wax lossis EVA cov cab kuj) raug txwv nruj me ntsis hauv kev txhaj tshuaj molding, tshuab molding, zaj duab xis stretching, thiab fiber ntau spinning. EVA raug thermal decomposition ntawm qhov kub siab tshaj 230 degree, tso acetic acid; qhov no tsis yog tsuas yog ua rau PET yaj lub zog loj heev- ua rau yellowing thiab brittleness- tab sis kuj corrodes screws thiab pwm.
2. Kev tiv thaiv kub thiab kub ruaj khov
Cov txheej txheem melting rau PET feem ntau yog 260℃-290 degree, nce mus txog 300℃rau qhov tshwj xeeb siab -kub spinning lossis tuab- cov txheej txheem phab ntsa txhaj tshuaj molding, nrog lub sijhawm yaj nyob hauv feem ntau yog li ntawm 3 mus rau 10 feeb.
Colorant Temperature Resistance Rating: Xaiv cov organic pigments, hnyav dyes, los yog inorganic pigments yuav tsum tiv taus kub ntawm ntau tshaj los yog sib npaug zos rau 280℃-300℃(ib DIN EN 12877 qauv) thiab tsis muaj qhov tseem ceeb xim sib txawv (ΔE <1.0) nyob rau hauv lub sij hawm nyob rau hauv lub chaw nyob.
Sublimation Resistance: Thaum lub sij hawm siab - qhov kub ntawm lub tshuab nqus tsev degassing los yog ziab theem, qis -molecular- cov xim xim hnyav yog qhov yooj yim rau volatilization thiab sublimation, uas tuaj yeem paug pwm qhov cua, chais, lossis ziab ntauwd lim. Yog li ntawd, qhov hnyav molecular thiab sublimation kuj ntsuas ntawm cov xim yuav tsum tau soj ntsuam nruj me ntsis . 3. Moisture Control and Drying Compatibility
Hydrolysis rhiab heev: Nyob rau hauv lub molten lub xeev, txawm ib tug kab ntawm noo noo sai sai ua rau polyester saw scission ntawm hydrolysis. Qhov no tshwm sim raws li kev poob qis hauv Intrinsic Viscosity (IV), qhov tsos ntawm "nyiaj streaks" los yog npuas nyob rau hauv cov khoom tiav, thiab embrittlement lossis cracking.
Factory Moisture Specifications: Rau siab - zoo PET masterbatches, lub Hoobkas ya raws cov ntsiab lus yuav tsum nruj me ntsis tswj ntawm tsawg dua los yog sib npaug rau 0.05% (500 ppm); rau siab -kawg ultra-thin film lossis fiber ntau- cov qib spinning, nws yuav tsum tsawg dua lossis sib npaug li 0.03% (300 ppm).
Drying Hopper Compatibility: Feem ntau cov txheej txheem PET yuav tsum dehumidifying kom qhuav ntawm 140℃-160℃rau 4-6 teev. Yog hais tias tus masterbatch tsis tau txais crystallization txaus (piv txwv li, nws tseem nyob amorphous), nws yuav soften, lo ua ke, thiab tsim clumps ("bridging") thaum qhov kub ntawm qhov ziab hopper tshaj lub iav hloov kub (Tg ≈ 78℃). Thaum muab khoom, nws yog ib qho tseem ceeb kom paub tseeb tias tus masterbatch puas ua ntej -crystalized thiab muaj peev xwm tiv taus cov kev ziab no.
4. Dispersion and Filter Pressure Value (FPV)
Agglomerate Control: Colorant thawj particle loj yog feem ntau nyob rau hauv micron ntau. Yog hais tias dispersion nyob rau hauv lub masterbatch yog tsis txaus, theem nrab agglomerates yuav ua rau lub raj mis preform breakage thaum lub sij hawm tshuab molding, "ntses ob lub qhov muag" (gels) nyob rau hauv films, thiab filament breakage nyob rau hauv hluavtaws fibers.
Filter Pressure Value (FPV) Testing:
Synthetic Fiber Spinning Grade (POY/FDY): Cov cai nruj; FPV feem ntau yuav tsum tsawg dua lossis sib npaug li 1.0–1.5 bar / g (kuaj siv lub vijtsam 1400-mesh), nrog rau qhov me me ntawm Tsawg dua lossis sib npaug li 2 μm.
BOPET Film Qib: FPV yuav tsum tsawg dua lossis sib npaug li 1.5–2.0 bar / g. Txhaj Molding & Preform Qib: Tsis muaj macroscopically pom impurities lossis xim specks ntawm qhov chaw; FPV Tsawg dua lossis sib npaug li 3.0 bar / g.
5. Migration Resistance & Weatherability
Solvent/Oil Migration Resistance: Thaum siv cov kuab tshuaj dyes rau pob tshab, kev sib raug zoo thiab kho cov xim nyob rau hauv cov polyester polymer chains yuav tsum tau soj ntsuam xyuas kom tsis txhob tsiv mus nyob rau hauv cov ntsiab lus xws li oily tshuaj, cawv, los yog carbonated dej haus.
Lightfastness/Weatherability Qib:
Cov khoom siv hauv tsev hauv tsev / ntim khoom: Lightfastness Ntau dua lossis sib npaug rau Qib 6 ntawm Blue Wool Scale.
Sab nraum zoov PET fabrics, nplooj ntawv, thiab shading qauv: Lightfastness Qib 7–8; Weatherability Grey Scale Ntau dua lossis sib npaug rau Qib 4.
6. Kev cuam tshuam rau Crystallization (Nucleation Effect)
Qee cov pigments inorganic thiab phthalocyanine pigments (piv txwv li, Phthalocyanine Blue, Phthalocyanine Green) pom muaj zog heterogeneous nucleation cuam tshuam, ho nce tus PET crystallization kub (Tc) thiab ceev tus nqi crystallization.
Tej yam tshwm sim: Localized spherulite kev loj hlob thaum lub sij hawm molding ntawm pob tshab preforms los yog nplooj ntawv, ua rau "whitening" los yog haziness; anisotropic shrinkage nyob rau hauv txhaj tshuaj- molded qhov chaw, ua rau warpage thiab deformation.
Countermeasures: Rau cov khoom pob tshab, xaiv polyester- cov xim tshwj xeeb lossis cov xim muaj kuab lom polyester uas tsis tshua muaj zog lossis tsis muaj nucleating; rau cov txheej txheem txhaj tshuaj-moulded qhov chaw, siv nto- hloov kho masterbatches tsim los rau qis shrinkage thiab warp kuj.
