Kev Tshawb Fawb thiab Kev Txhim Kho ntawm Cov Tshuaj Tiv Thaiv Hluav Taws rau PVC Coatings

Kev Tshawb Fawb thiab Kev Txhim Kho ntawm Cov Tshuaj Tiv Thaiv Hluav Taws rau PVC Coatings

Tus neeg siv khoom tsim cov tsev pheeb suab PVC thiab xav tau siv cov txheej tiv thaiv hluav taws. Cov mis tam sim no muaj 60 qhov PVC resin, 40 qhov TOTM, 30 qhov txhuas hypophosphite (nrog 40% phosphorus cov ntsiab lus), 10 qhov MCA, 8 qhov zinc borate, nrog rau cov dispersants. Txawm li cas los xij, qhov kev ua haujlwm tiv thaiv hluav taws tsis zoo, thiab qhov kev tawg ntawm cov nplaim taws kuj tsis txaus. Hauv qab no yog kev tshuaj xyuas ntawm cov laj thawj thiab kev hloov kho rau cov mis.

I. Cov laj thawj tseem ceeb rau kev tsis kub hnyiab

1. Lub Tshuab Hluav Taws Xob Tsis Sib Npaug nrog Cov Teeb Meem Tsis Muaj Zog

• Aluminium hypophosphite ntau dhau (30 qhov chaw):
  Txawm hais tias txhuas hypophosphite yog cov tshuaj tua hluav taws uas muaj phosphorus zoo (muaj 40% phosphorus), kev ntxiv ntau dhau (> 25 qhov) tuaj yeem ua rau:
• Kev nce ntxiv ntawm qhov viscosity ntawm lub cev, ua rau kev sib kis nyuaj thiab tsim cov agglomerated hotspots uas ua rau kev kub hnyiab sai dua ("wick effect").
• Txo cov khoom siv tawv thiab cov khoom ua zaj duab xis tsis zoo vim muaj cov khoom inorganic ntau dhau.
• Cov ntsiab lus MCA siab (10 qhov):
  MCA (raws li nitrogen) feem ntau yog siv ua synergist. Thaum cov tshuaj ntau tshaj 5 feem, nws feem ntau yuav mus rau saum npoo, ua rau cov tshuaj tua hluav taws tsis zoo thiab ua rau cuam tshuam nrog lwm cov tshuaj tua hluav taws.
• Tsis muaj cov synergists tseem ceeb:
  Txawm hais tias zinc borate muaj cov teebmeem tiv thaiv pa luam yeeb, qhov tsis muaj antimony-based (piv txwv li, antimony trioxide) lossis cov hlau oxide (piv txwv li, txhuas hydroxide) cov tshuaj tiv thaiv kev tsim cov "phosphorus-nitrogen-antimony" synergistic system, ua rau tsis txaus cov pa roj-theem nplaim taws.

2. Kev Tsis Sib Haum Ntawm Kev Xaiv Yasizer thiab Lub Hom Phiaj Tiv Thaiv Hluav Taws

• TOTM (trioctyl trimellitate) muaj kev tiv thaiv hluav taws tsawg:
  TOTM zoo heev hauv kev tiv taus cua sov tab sis tsis tshua muaj txiaj ntsig zoo hauv kev tiv taus hluav taws piv rau phosphate esters (piv txwv li, TOTP). Rau cov ntawv thov tiv taus hluav taws kub xws li cov txheej txheem tsev pheeb suab, TOTM tsis tuaj yeem muab cov hluav taws kub txaus thiab muaj peev xwm tiv taus oxygen.
• Tsis txaus cov khoom siv yas (tsuas yog 40 qhov):
  Feem ntau cov PVC resin xav tau 60–75 feem ntawm cov plasticizer kom ua tiav cov yas. Cov plasticizer tsawg ua rau cov viscosity yaj siab, ua rau cov teeb meem tawg ntawm cov nplaim taws hnyav dua.

3. Lub Tshuab Hluav Taws Xob Tsis Zoo Ua Rau Muaj Kev Faib Hluav Taws Tsis Sib Npaug

• Tus neeg ua kom cov hluav taws xob tam sim no yuav yog hom siv dav dav (piv txwv li, stearic acid lossis PE wax), uas tsis zoo rau cov tshuaj tiv thaiv hluav taws kub inorganic (aluminium hypophosphite + zinc borate tag nrho 48 qhov), ua rau:
• Kev sib sau ua ke ntawm cov khoom me me uas tiv taus hluav taws, tsim cov chaw tsis muaj zog hauv cov txheej txheej.
• Cov dej yaj tsis zoo thaum lub sijhawm ua tiav, tsim cov cua sov shear uas ua rau muaj kev lwj ua ntej.

4. Kev Sib Txuas Tsis Zoo Ntawm Cov Khoom Uas Tiv Thaiv Hluav Taws Thiab PVC

• Cov ntaub ntawv inorganic xws li txhuas hypophosphite thiab zinc borate muaj qhov sib txawv polarity tseem ceeb nrog PVC. Yog tsis muaj kev hloov kho qhov chaw (piv txwv li, cov neeg sawv cev silane coupling), kev sib cais theem tshwm sim, txo qhov ua tau zoo ntawm nplaim taws.

II. Txoj Kev Tsim Qauv Tseem Ceeb

1. Hloov cov yas thawj zaug nrog TOTP

• Siv nws cov nplaim taws zoo heev (phosphorus cov ntsiab lus ≈9%) thiab cov nyhuv plasticizing.

2. Txhim kho qhov sib piv ntawm cov nplaim taws thiab kev sib koom ua ke

• Khaws cov txhuas hypophosphite ua qhov tseem ceeb ntawm phosphorus tab sis txo nws cov koob tshuaj kom zoo dua qub thiab txo qhov "wick effect."
• Khaws cov zinc borate ua ib qho tseem ceeb synergist (txhawb kom charring thiab tshem tawm pa luam yeeb).
• Khaws MCA ua ib qho nitrogen synergist tab sis txo nws cov koob tshuaj kom tiv thaiv kev tsiv teb tsaws chaw.
• Qhia tawmultrafine txhuas hydroxide (ATH)raws li ib qho khoom siv ntau yam:
• Kev tiv thaiv hluav taws kub:Kev rhuav tshem cov pa roj uas yooj yim hlawv (kev qhuav dej), kev txias, thiab kev yaj cov pa roj uas yooj yim hlawv.
• Kev tswj pa luam yeeb:Txo cov pa luam yeeb ntau heev.
• Cov khoom sau:Txo cov nqi (piv rau lwm cov tshuaj tua hluav taws).
• Kev sib kis thiab ntws zoo dua (qib ultrafine):Yooj yim dua rau kev tawg dua li cov ATH ib txwm muaj, txo qhov viscosity nce.

3. Cov Kev Daws Teeb Meem Zoo Rau Cov Teeb Meem Kev Tawg Tawm

• Ua kom cov ntsiab lus plasticizer ntau ntxiv:Xyuas kom meej tias PVC plasticization tag nrho thiab txo qhov viscosity ntawm lub kaw lus.
• Siv cov tshuaj super-dispersants ua haujlwm tau zoo:Tsim tshwj xeeb rau cov hmoov inorganic uas muaj load siab, yooj yim agglomerated (aluminium hypophosphite, ATH).
• Ua kom zoo dua qub (kev sib tov ua ntej yog qhov tseem ceeb):Xyuas kom meej tias cov tshuaj tua hluav taws ntub thiab tawg tag.

4. Xyuas kom meej tias Kev Ua Haujlwm Ruaj Khov

• Ntxiv cov tshuaj stabilizers kom txaus thiab cov roj nplua nyeem kom tsim nyog.

III. Cov Qauv PVC Uas Tiv Thaiv Hluav Taws Tau Kho Dua Tshiab

IV. Cov Lus Cim thiab Cov Ntsiab Lus Tseem Ceeb

1. TOTP yog Lub Hauv Paus Tseem Ceeb

• 65–75 qhovua kom ntseeg tau tias:
• Kev ua kom yas tag nrho: PVC xav tau cov khoom siv yas txaus rau kev tsim cov yeeb yaj kiab mos, txuas ntxiv mus.
• Kev txo qhov viscosity: Tseem ceeb rau kev txhim kho kev sib kis ntawm cov khoom siv hluav taws xob inorganic uas muaj zog heev.
• Kev tiv thaiv hluav taws kub: TOTP nws tus kheej yog cov yas ua kom tsis txhob muaj hluav taws kub zoo heev.

2. Kev Sib Txuas Hluav Taws Kub

• PNB-Al kev sib koom ua ke:Aluminium hypophosphite (P) + MCA (N) muab kev sib koom ua ke ntawm PN. Zinc borate (B, Zn) ua rau lub zog hluav taws xob thiab kev tswj pa luam yeeb zoo dua. Ultrafine ATH (Al) muab kev txias endothermic loj heev thiab kev tswj pa luam yeeb zoo dua. TOTP kuj tseem pab txhawb phosphorus. Qhov no tsim kom muaj ntau yam khoom sib koom ua ke.
• Lub luag haujlwm ntawm ATH:25–35 feem ntawm ATH zoo heev yog ib qho tseem ceeb uas ua rau muaj kev tiv thaiv hluav taws thiab kev tswj pa luam yeeb. Nws txoj kev lwj ntawm lub cev nqus tau cua sov, thaum cov pa dej uas tso tawm ua rau cov pa oxygen thiab cov pa roj uas yooj yim hlawv tsis muaj zog.Ultrafine thiab surface-treated ATH yog qhov tseem ceeb heevkom txo qhov cuam tshuam ntawm viscosity thiab txhim kho PVC compatibility.
• Txo cov txhuas hypophosphite:Txo qis dua ntawm 30 mus rau 15-20 qhov kom txo qhov hnyav ntawm lub cev thaum tseem tswj tau phosphorus.
• MCA txo qis:Txo qis ntawm 10 mus rau 4-6 daim kom tiv thaiv kev tsiv teb tsaws chaw.

3. Kev daws teeb meem tawg - Qhov tseem ceeb rau kev vam meej

• Super-dispersant (3–4 qhov chaw):Tseem ceeb rau kev tswj cov khoom siv siab (50–70 feem tag nrho cov khoom siv inorganic!), uas nyuaj rau tawg (aluminium hypophosphite + ultrafine ATH + zinc borate).Cov tshuaj dispersants ib txwm muaj (piv txwv li, calcium stearate, PE wax) tsis txaus!Nqis peev rau cov super-dispersants ua haujlwm tau zoo thiab siv cov nyiaj txaus.
• Cov khoom siv ua kom yas (65–75 qhov):Raws li saum toj no, txo cov viscosity tag nrho, tsim kom muaj ib puag ncig zoo dua rau kev sib kis.
• Cov roj nplua nyeem (1–2 qhov):Kev sib xyaw ua ke ntawm cov roj nplua nyeem sab hauv / sab nraud ua kom muaj kev ntws zoo thaum lub sijhawm sib tov thiab txheej, tiv thaiv kev lo.

4. Kev Ua - Cov Txheej Txheem Ua Ntej Sib Tov Nruj

• Kauj Ruam 1 (Cov hmoov inorganic qhuav sib tov):
• Ntxiv txhuas hypophosphite, ultrafine ATH, zinc borate, MCA, thiab txhua yam super-dispersant rau hauv lub tshuab sib tov ceev ceev.
• Sib tov ntawm 80–90°C li 8–10 feeb. Lub Hom Phiaj: Xyuas kom cov tshuaj super-dispersant npog tag nrho txhua lub khoom me me, thiab rhuav cov agglomerates.Lub sijhawm thiab qhov kub thiab txias yog qhov tseem ceeb heev!
• Kauj Ruam 2 (Kev tsim cov slurry):
• Ntxiv feem ntau ntawm TOTP (piv txwv li, 70–80%), txhua yam khoom siv ua kom sov, thiab cov roj nplua nyeem sab hauv rau hauv qhov sib tov los ntawm Kauj Ruam 1.
• Sib tov ntawm 90–100°C li 5–7 feeb kom ua tau ib qho slurry uas tsis kub hnyiab thiab sib npaug. Xyuas kom cov hmoov tau ntub tag los ntawm cov plasticizers.
• Kauj Ruam 3 (Ntxiv PVC thiab cov khoom seem):
• Ntxiv PVC resin, TOTP seem, cov roj nplua nyeem sab nraud (thiab cov tshuaj antioxidants/UV stabilizers, yog tias ntxiv rau theem no).
• Sib tov ntawm 100–110°C li 7–10 feeb kom txog thaum mus txog qhov "qhuav" (ntws dawb, tsis muaj pawg).Tsis txhob sib tov ntau dhau kom tiv thaiv PVC puas tsuaj.
• Txias:Tso tawm thiab txias cov khoom sib tov kom txog thaum <50 ° C kom tsis txhob lo ua ke.

5. Kev Ua Tom Qab

• Siv cov khoom sib tov qhuav txias rau kev calendering lossis txheej.
• Tswj qhov kub ntawm kev ua haujlwm kom nruj me ntsis (qhov kub yaj pom zoo ≤170–175 ° C) kom tsis txhob muaj kev puas tsuaj ntawm lub stabilizer lossis kev lwj ua ntej lub sijhawm ntawm cov tshuaj tiv thaiv hluav taws (piv txwv li, ATH).

V. Cov Txiaj Ntsig Xav Tau thiab Kev Ceev Faj

• Kev tiv thaiv hluav taws kub:Piv rau cov mis thawj (TOTM + high aluminum hypophosphite/MCA), cov mis hloov kho tshiab no (TOTP + optimized P/N/B/Al ratios) yuav tsum txhim kho qhov hluav taws kub, tshwj xeeb tshaj yog hauv kev ua haujlwm hlawv ntsug thiab kev tswj pa luam yeeb. Lub hom phiaj cov qauv zoo li CPAI-84 rau cov tsev pheeb suab. Cov kev xeem tseem ceeb: ASTM D6413 (hlawv ntsug).
• Kev tawg tawm:Super-dispersant + high plasticizer + optimized pre-mixing yuav tsum txhim kho kev sib kis zoo heev, txo cov agglomeration thiab txhim kho kev sib xws ntawm txheej.
• Kev Ua Tau:Cov TOTP thiab cov roj nplua nyeem txaus yuav tsum ua kom muaj kev ua haujlwm du, tab sis saib xyuas qhov viscosity thiab lo thaum lub sijhawm tsim khoom tiag tiag.
• Tus nqi:TOTP thiab cov super-dispersants kim heev, tab sis cov txhuas hypophosphite thiab MCA uas txo qis yuav pab them qee cov nqi. ATH pheej yig heev.

Cov Lus Ceeb Toom Tseem Ceeb:

• Ua ntej tshaj, sim ua tej yam me me xwb!Sim hauv chav kuaj thiab kho raws li cov ntaub ntawv tiag tiag (tshwj xeeb tshaj yog ATH thiab kev ua tau zoo super-dispersant) thiab cov khoom siv.
• Kev xaiv khoom siv:
• ATH:Yuav tsum siv cov qib ultrafine (D50 ≤2µm), uas kho qhov chaw (piv txwv li, silane). Sab laj nrog cov neeg muag khoom kom paub cov lus qhia uas siv tau nrog PVC.
• Cov tshuaj super-dispersants:Yuav tsum siv cov hom ua haujlwm tau zoo. Qhia rau cov neeg muag khoom txog daim ntawv thov (PVC, cov khoom siv inorganic uas muaj cov khoom siv ntau, cov khoom siv hluav taws tsis muaj halogen).
• TOTP:Xyuas kom zoo.
• Kev Ntsuas:Ua qhov kev ntsuam xyuas kom ruaj khov txog kev tiv thaiv hluav taws raws li cov qauv. Tsis tas li ntawd, soj ntsuam qhov kev laus/kev tiv thaiv dej (qhov tseem ceeb rau cov tsev pheeb suab sab nraum zoov!). Cov tshuaj tiv thaiv UV thiab cov tshuaj antioxidants yog qhov tseem ceeb.

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