Dissolution uye Dispersion process yeSolid Flame Retardants muPolyurethane AB Adhesive System.

Dissolution uye Dispersion process yeSolid Flame Retardants muPolyurethane AB Adhesive System.

Pakunyungudika/kupararira kwezvakasimba zvinodzoreredza moto zvakaita sealuminium hypophosphite (AHP), aluminium hydroxide (ATH), zinc borate, uye melamine cyanurate (MCA) mune polyurethane AB adhesive system, matanho akakosha anosanganisira pretreatment, kupatsanurwa kwekanhanho, uye kutonga kwakasimba kwehunyoro. Pazasi pane yakadzama maitiro (yepamusoro murazvo-retardant formulations; mamwe magadzirirwo anogona kugadziridzwa zvinoenderana).

I. Misimboti Huru

1. "Kuparara" ndiko kunyanya kupararira: Zvidziviriro zvemurazvo zvakasimba zvinofanira kuparadzirwa zvakafanana mu polyol (A-chikamu) kuti zvigadzire kumira kwakagadzikana.
2. Pretreatment of flame retardants: Gadzirisa nyaya dzekunwa kwemwando, agglomeration, uye reactivity ine isocyanates.
3. Stepwise yekuwedzera: Wedzera zvinhu muhurongwa hwe density uye particle size kudzivirira nzvimbo dzakakwirira.
4. Kudzora kunyorova kwemvura: Mvura inodya isocyanate (-NCO) muchikamu cheB, zvichiita kuti pasapora.

II. Detailed Operating Procedure (Yakavakirwa pazvikamu zana polyol muA-chikamu)

Danho 1: Flame Retardant Pretreatment (maawa makumi maviri nemana pamberi)

• Aluminium Hypophosphite (AHP, 10 zvikamu):
  • Kuturika kwepamusoro ne silane coupling agent (KH-550) kana titanate coupling agent (NDZ-201):
    • Sanganisa 0.5 zvikamu zvekubatanidza mumiririri + 2 zvikamu anhydrous ethanol, simbisai 10 min ye hydrolysis.
    • Wedzera AHP poda uye simbisa nekumhanya kukuru (1000 rpm) ye20 min.
    • Pukuta muchoto pa80 ° C kwemaawa maviri, wozochengeta wakavharwa.
• Aluminium Hydroxide (ATH, 25 zvikamu):
  • Shandisa submicron-sized, silane-modified ATH (eg, Wandu WD-WF-20). Kana isina kuchinjwa, bata zvakafanana neAHP.
• MCA (6 zvikamu) uye Zinc Borate (4 zvikamu):
  • Dry pa 60 ° C kwemaawa mana kuti ubvise hunyoro, wozosefa kuburikidza ne300-mesh skrini.

Danho 2: A-Chikamu (Polyol Side) Dispersion Process

1. Base Mixing:
   • Wedzera 100 zvikamu zve polyol (semuenzaniso, polyether polyol PPG) mugaba rakaoma.
   • Wedzera 0.3 zvikamu zve polyether-modified polysiloxane leveling agent (semuenzaniso, BYK-333).
2. Low-Speed ​​Pre-Dispersion:
   • Wedzera zvinodzoreredza moto muhurongwa: ATH (zvikamu makumi maviri neshanu) → AHP (zvikamu gumi) → zinc borate (zvikamu zvina) → MCA (zvikamu zvitanhatu).
   • Shingairira pa 300-500 rpm kwemaminitsi gumi kusvikira pasina poda yakaoma inosara.
3. High-Shear Dispersion:
   • Chinja kune yakakwira-kumhanya disperser (≥1500 rpm) ye30 min.
   • Kudzora tembiricha ≤50 ° C (kudzivirira polyol oxidation).
4. Kukuya & kunatsa (Yakakosha!):
   • Pfuura nepakati-matatu-roll mill kana bhasiki jecha chigayo 2-3 nguva kusvika fineness ≤30μm (yakaedzwa kuburikidza neHegman gauge).
5. Viscosity Kugadziriswa & Defoaming:
   • Wedzera 0.5 zvikamu hydrophobic fumed silica (Aerosil R202) kudzivirira kugadzirisa.
   • Wedzera 0.2 zvikamu silicone defoamer (semuenzaniso, Tego Airex 900).
   • Shingairira pa 200 rpm ye 15 min ye degassing.

Danho 3: B-Chikamu (Isocyanate Side) Kurapa

• Wedzera 4-6 zvikamu zve molecular sieve (semuenzaniso, Zeochem 3A) kune B-chikamu (semuenzaniso, MDI prepolymer) yekunyudza hunyoro.
• Kana ukashandisa mvura phosphorus flame retardants (yakaderera-viscosity sarudzo), zvakananga sanganisa muB-chikamu uye simbisa 10 min.

Nhanho 4: AB Chikamu Kusanganisa & Kurapa

• Kusanganisa reshiyo: Tevedzera yekutanga AB adhesive dhizaini (semuenzaniso, A:B = 100:50).
• Mixing process:
  • Shandisa mbiri-chikamu chepuraneti musanganiswa kana static kusanganisa chubhu.
  • Sakanidza 2-3 min kusvika yunifomu (pasina tambo).
• Kurapa mamiriro:
  • Kurapa tembiricha yekamuri: maawa makumi maviri nemana (akawedzerwa ne30% nekuda kwekunyudzwa kwemoto unodzoreredza kupisa).
  • Kukurumidza kupora: 60°C/2 maawa (kusimbisa kune mhedzisiro isina bubble).

III. Key Process Control Points

IV. Dzimwe nzira dzekuparadzira (Pasina Zvishandiso zvekukuya)

1. Ball milling pretreatment:
   • Sanganisa zvinodzosa moto uye polyol pachiyero che1: 1, bhora chigayo kwemaawa mana (zirconia balls, 2mm size).
2. Masterbatch nzira:
   • Gadzirira 50% flame retardant masterbatch (polyol semutakuri), wozodzikisa usati washandisa.
3. Ultrasonic dispersion:
   • Shandisa ultrasonication (20kHz, 500W, 10 min) kune premixed slurry (yakakodzera mabheti maduku).

V. Implementation Recommendations

1. Kuedza kudiki-diki kutanga: Edza ne100g yeA-chikamu, uchitarisa pakugadzikana kwe viscosity (24h shanduko <10%) uye kukurumidza kurapa.
2. Flame retardant yekuwedzera sequence mutemo:
   • “Kutanga kurema, kuzoreruka gare gare; kutanga zvakanaka, kugozha gare gare” → ATH (inorema) → AHP (yakanaka) → zinc borate (pakati) → MCA (yakajeka/yakakoshwa).
3. Emergency troubleshooting:
   • Kamwe kamwe viscosity kuwedzera: Wedzera 0.5% propylene glycol methyl ether acetate (PMA) kuti uwedzere.
   • Kurapa kusina kunaka: Wedzera 5% yakagadziridzwa MDI (semuenzaniso, Wanhua PM-200) kune B-chikamu.