Polyurethane AB Adhesive Powder Flame Retardant Formulations

Polyurethane AB Adhesive Powder Flame Retardant Formulations
Dangane da buƙatar ƙirar halogen-free harshen retardant formulations ga polyurethane AB adhesives, hade tare da halaye da synergistic effects na harshen retardants kamar aluminum hypophosphite (AHP), aluminum hydroxide (ATH), zinc borate, da melamine cyanurate (MCA), wadannan uku hadawa makircinsu an tsara. Waɗannan ƙa'idodin ba su da chlorine kuma suna mai da hankali kan haɓaka haɓakar ƙarancin wuta, dacewar aikin jiki, da yuwuwar tsari:

1. Babban flame Redardy

Haɗin Ƙwararrun Ƙwararru:

• Aluminum hypophosphite (AHP): 8-12 phr (nau'in mai rufi polyurethane mai ruwa wanda aka ba da shawarar don magance matsalolin hazo)
• Aluminum hydroxide (ATH): 20-25 phr (submicron grade, 0.2-1.0 μm, don inganta oxygen index da char compactness)
• MCA: 5-8 phr (na'urar-lokacin iskar gas, daidaitawa tare da AHP a cikin lokaci mai raɗaɗi)
• Zinc borate: 3-5 phr (yana inganta samuwar yumbura kuma yana hana hayaƙi)

Ayyukan da ake tsammani:

• Oxygen index (LOI): ≥32% (pure PU ≈22%);
• UL94 rating: V-0 (1.6 mm kauri);
• Ƙarfafawar thermal: 0.45-0.55 W / m · K (wanda ATH da zinc borate suka ba da gudummawa);
• Ikon danko: 25,000-30,000 cP (maganin saman da ake buƙata don hana lalata).

Mabuɗin Tsari:

• Dole ne a fara tarwatsa AHP a cikin ɓangaren polyol (Sashe na A) don kauce wa abin da bai kai ba tare da isocyanate (Sashe na B);
• Ya kamata a canza ATH tare da wakilin haɗin gwiwar silane (misali, KH-550) don haɓaka haɗin kai tsakanin fuska.

2. Ƙididdigar Ƙarfafa Ƙarfafa Ƙarfafa (Domin rufewar gini, haɗin kayan aiki, manufa UL94 V-1)

Haɗin Ƙwararrun Ƙwararru:

• Aluminum hydroxide (ATH): 30-40 phr (misali micron-grade, farashi-tasiri, nau'in nau'in filler mai riƙe da wuta);
• Ammonium polyphosphate (APP): 10-15 phr (haɗe tare da MCA don tsarin intumescent, maye gurbin halogenated jamiái);
• MCA: 5-7 phr (rabo zuwa APP 1: 2 ~ 1: 3, yana inganta kumfa da warewar oxygen);
• Zinc borate: 5 phr (yunƙurin hayaki, samuwar char mai taimako).

Ayyukan da ake tsammani:

• LOI: ≥28%;
• Ƙididdigar UL94: V-1;
• Rage farashi: ~ 30% (idan aka kwatanta da ƙididdiga na rashin jin daɗi mai tsanani);
• Ƙarfin ƙarfi na riƙewa: ≥80% (APP yana buƙatar encapsulation don hana hydrolysis).

Mabuɗin Tsari:

• APP dole ne ya zama microencapsulated (misali, tare da resin melamine-formaldehyde) don guje wa shayar da danshi da samuwar kumfa;
• Ƙara 1-2 phr hydrophobic fumed silica (misali, Aerosil R202) don hana daidaitawa.

3. Low-danko mai sauƙin sauƙin tsari (don daidaitaccen kayan lantarki, yana buƙatar babban gudu)

Haɗin Ƙwararrun Ƙwararru:

• Aluminum hypophosphite (AHP): 5-8 phr (nanosized, D50 ≤1 μm);
• Liquid Organic phosphorus harshen retardant (BDP madadin): 8-10 phr (misali, halogen-free phosphorus tushen abubuwan DMMP, kiyaye danko);
• Aluminum hydroxide (ATH): 15 phr (spherical alumina composite, daidaita thermal conductivity);
• MCA: 3-5 phr.

Ayyukan da ake tsammani:

• Matsakaicin danko: 10,000-15,000 cP (kusa da tsarin hana wuta na ruwa);
• Jinkirin harshen wuta: UL94 V-0 (wanda aka haɓaka ta ruwa phosphorus);
• Ƙarfafawar thermal: ≥0.6 W/m · K (wanda aka ba da gudummawa ta alumina mai siffar zobe).

Mabuɗin Tsari:

• AHP da alumina mai siffar zobe dole ne a haɗa su tare kuma a tarwatsa su ƙarƙashin babban ƙarfi (≥2000 rpm);
• Ƙara 4-6 phr ƙwanƙwaran ƙwayar ƙwayar ƙwayar ƙwayar cuta zuwa Sashe na B don hana ɗaukar danshi na AHP.

4. Haɗa Abubuwan Fasaha & Madadin Magani

1. Hanyoyin Haɗin Kai:

• AHP + MCA:AHP yana haɓaka bushewar ruwa da caja, yayin da MCA ke fitar da iskar nitrogen akan dumama, yana samar da char mai kama da zuma.
• ATH + Zinc borate:ATH yana ɗaukar zafi (1967 J / g), kuma zinc borate yana samar da Layer gilashin borate don rufe saman.

2. Madadin Masu Cire Harshe:

• Abubuwan da aka samo asali na polyphosphazene:Babban inganci da abokantaka, tare da amfani da HCl na samfur;
• Epoxy silicone resin (ESR):Lokacin da aka haɗa shi da AHP, yana rage jimlar lodi (18% don V-0) kuma yana inganta kayan aikin injiniya.

3. Gudanar da Haɗarin Tsari:

• Lalacewa:Abubuwan da aka gyara (misali, nau'ikan gyare-gyaren polyurea) ana buƙata idan danko <10,000 cP;
• Hana warkewa:Guji wuce gona da iri na retardants na harshen wuta (misali, MCA) don hana tsangwama tare da halayen isocyanate.

5. Shawarwari na Aiwatarwa

• Ba da fifikon gwada ƙirar mai ɗaukar wuta mai ƙarfi: mai rufi AHP + submicron ATH (matsakaicin girman barbashi 0.5 μm) a AHP:ATH:MCA = 10:20:5 don ingantawa na farko.
• Gwaje-gwaje masu mahimmanci:
  → LOI (GB/T 2406.2) da UL94 kona tsaye;
  → Ƙarfin haɗin gwiwa bayan hawan keke na thermal (-30 ℃ ~ 100 ℃, 200 hours);
  → Hazo mai saurin wuta bayan saurin tsufa (60 ℃/7d).

Teburin Ƙirƙirar Harshen Harshe