Cov Txheej Txheem Yaj Thiab Kev Tawm Tsam ntawm Cov Khoom Hluav Taws Kub Retardants hauv Polyurethane AB Adhesive System

Cov Txheej Txheem Yaj Thiab Kev Tawm Tsam ntawm Cov Khoom Hluav Taws Kub Retardants hauv Polyurethane AB Adhesive System

Rau kev yaj/kev tawg ntawm cov khoom siv hluav taws kub xws li txhuas hypophosphite (AHP), txhuas hydroxide (ATH), zinc borate, thiab melamine cyanurate (MCA) hauv polyurethane AB nplaum system, cov kauj ruam tseem ceeb suav nrog kev kho ua ntej, kev tawg ua ntu zus, thiab kev tswj hwm dej noo. Hauv qab no yog cov txheej txheem ntxaws ntxaws (rau cov qauv hluav taws kub siab; lwm cov qauv tuaj yeem hloov kho raws li qhov tsim nyog).

I. Cov Ntsiab Cai Tseem Ceeb

1. "Kev yaj" yog qhov tseem ceeb tshaj plaws kev sib kis: Cov tshuaj tiv thaiv hluav taws kub yuav tsum tau sib kis sib npaug hauv polyol (A-component) kom tsim tau ib qho kev ncua ruaj khov.
2. Kev kho ua ntej ntawm cov tshuaj tiv thaiv hluav taws: daws cov teeb meem ntawm kev nqus dej noo, kev sib sau ua ke, thiab kev ua haujlwm nrog isocyanates.
3. Kev ntxiv cov kauj ruam: Ntxiv cov ntaub ntawv raws li qhov ceev thiab qhov loj ntawm cov khoom me me kom tsis txhob muaj cov khoom ntau dhau hauv zos.
4. Kev tswj cov dej noo kom nruj: Dej haus cov isocyanate (-NCO) hauv B-component, ua rau nws tsis khov.

II. Cov Txheej Txheem Ua Haujlwm Kom Paub Tseeb (Raws li 100 qhov polyol hauv A-component)

Kauj Ruam 1: Kev Kho Mob Ua Ntej Rau Cov Khoom Uas Tiv Thaiv Hluav Taws (24 teev ua ntej)

• Aluminium Hypophosphite (AHP, 10 qhov chaw):
  • Kev txheej txheej saum npoo nrog silane coupling agent (KH-550) lossis titanate coupling agent (NDZ-201):
    • Sib tov 0.5 feem ntawm cov tshuaj sib txuas + 2 feem ntawm anhydrous ethanol, do rau 10 feeb rau hydrolysis.
    • Ntxiv cov hmoov AHP thiab do ntawm qhov ceev ceev (1000 rpm) rau 20 feeb.
    • Qhuav hauv qhov cub ntawm 80 ° C rau 2 teev, tom qab ntawd khaws cia kom kaw.
• Aluminium Hydroxide (ATH, 25 qhov chaw):
  • Siv cov ATH uas muaj qhov loj li submicron, silane-modified (piv txwv li, Wandu WD-WF-20). Yog tias tsis tau hloov kho, kho ib yam li AHP.
• MCA (6 qhov) & Zinc Borate (4 qhov):
  • Qhuav ntawm 60°C rau 4 teev kom tshem tawm cov dej noo, tom qab ntawd lim los ntawm 300-mesh screen.

Kauj Ruam 2: A-Component (Polyol Side) Dispersion Txheej Txheem

1. Kev Sib Tov Khoom Siv:
   • Ntxiv 100 feem polyol (piv txwv li, polyether polyol PPG) rau hauv lub thawv qhuav.
   • Ntxiv 0.3 feem polyether-modified polysiloxane leveling agent (piv txwv li, BYK-333).
2. Kev Ua Ntej Ua Ntej Kev Faib Tawm Ceev Qis:
   • Ntxiv cov tshuaj tiv thaiv hluav taws raws li qhov kev txiav txim: ATH (25 qhov) → AHP (10 qhov) → zinc borate (4 qhov) → MCA (6 qhov).
   • Do ntawm 300-500 rpm rau 10 feeb kom txog thaum tsis muaj hmoov qhuav seem.
3. Kev tawg ntawm cov khoom siv siab heev:
   • Hloov mus rau lub tshuab faib tawm ceev ceev (≥1500 rpm) rau 30 feeb.
   • Tswj qhov kub thiab txias ≤50 ° C (kom tiv thaiv polyol oxidation).
4. Kev Sib Tsoo & Kev Txhim Kho (Tseem Ceeb!):
   • Dhau los ntawm lub tshuab zeb peb-yob lossis lub tshuab xuab zeb pob tawb 2-3 zaug kom txog thaum qhov zoo ≤30μm (sim los ntawm Hegman gauge).
5. Kev Kho Kom Zoo thiab Ua Npuas Ncauj:
   • Ntxiv 0.5 feem hydrophobic fumed silica (Aerosil R202) kom tiv thaiv kev poob qis.
   • Ntxiv 0.2 feem ntawm cov silicone defoamer (piv txwv li, Tego Airex 900).
   • Do ntawm 200 rpm rau 15 feeb rau degassing.

Kauj Ruam 3: Kev Kho Mob B-Component (Sab Isocyanate)

• Ntxiv 4-6 feem molecular sieve (piv txwv li, Zeochem 3A) rau hauv B-component (piv txwv li, MDI prepolymer) rau kev nqus dej noo.
• Yog tias siv cov tshuaj phosphorus uas ua rau hluav taws kub (xaiv tsis muaj viscosity ntau), sib tov ncaj qha rau hauv cov khoom B thiab do li 10 feeb.

Kauj Ruam 4: Kev Sib Tov thiab Kho Cov Cheebtsam AB

• Qhov sib xyaw ua ke: Ua raws li tus qauv AB nplaum qub (piv txwv li, A:B = 100:50).
• Cov txheej txheem sib tov:
  • Siv lub tshuab sib tov ob yam khoom sib xyaw lossis lub raj sib tov zoo li qub.
  • Sib tov rau 2-3 feeb kom txog thaum sib npaug (tsis muaj hlua).
• Cov xwm txheej kho:
  • Kho kom sov hauv chav tsev: 24 teev (ntev dua 30% vim yog hluav taws kub nqus tau).
  • Kev kho kom sai: 60°C/2 teev (paub tseeb tias tsis muaj npuas).

III. Cov Ntsiab Lus Tseem Ceeb ntawm Kev Tswj Xyuas Txheej Txheem

IV. Lwm Txoj Kev Sib Tov (Tsis Muaj Cov Khoom Siv Sib Tsoo)

1. Kev kho ua ntej ntawm kev sib tsoo pob:
   • Sib tov cov tshuaj tiv thaiv hluav taws thiab polyol ntawm qhov sib piv 1: 1, tsoo pob rau 4 teev (cov pob zirconia, loj 2 hli).
2. Txoj kev Masterbatch:
   • Npaj ib lub masterbatch 50% uas tiv taus hluav taws (polyol ua tus cab kuj), ces dilute ua ntej siv.
3. Ultrasonic dispersion:
   • Siv ultrasonication (20kHz, 500W, 10 feeb) rau premixed slurry (haum rau cov khoom me me).

V. Cov Lus Qhia Txog Kev Siv

1. Kev sim me me ua ntej: Sim nrog 100g ntawm A-component, tsom mus rau qhov ruaj khov ntawm viscosity (24 teev hloov <10%) thiab kev kho sai.
2. Txoj cai ntxiv cov nplaim taws retardant:
   • "Hnyav ua ntej, lub teeb tom qab; zoo ua ntej, ntxhib tom qab" → ATH (hnyav) → AHP (zoo) → zinc borate (nruab nrab) → MCA (lub teeb/ntxhib).
3. Kev daws teeb meem thaum muaj xwm txheej ceev:
   • Kev nce viscosity sai sai: Ntxiv 0.5% propylene glycol methyl ether acetate (PMA) kom dilute.
   • Kev kho tsis zoo: Ntxiv 5% MDI hloov kho (piv txwv li, Wanhua PM-200) rau B-component.