ʻO ka Polyurethane AB Adhesive Powder Flame Retardant Formulations

ʻO ka Polyurethane AB Adhesive Powder Flame Retardant Formulations
Ma muli o ke koi ʻana i nā mea hoʻoheheʻe ahi halogen-free no nā polyurethane AB adhesives, i hui pū ʻia me nā hiʻohiʻona a me nā hopena synergistic o nā mea hoʻopaʻa ahi e like me ka alumini hypophosphite (AHP), alumini hydroxide (ATH), zinc borate, a me melamine cyanurate (MCA), ua hoʻolālā ʻia nā papa hana ʻekolu. ʻAʻole chlorine kēia mau hoʻopihapiha a nānā i ka hoʻomaikaʻi ʻana i ka maikaʻi o ka lapalapa ahi, ka hoʻokō kino kino, a me ka hiki ke hana.

1. ʻO ka hoʻokumu ʻana o ke ahi kiʻekiʻe (No ka ipu uila, ka hoʻopili ʻana i ka pākaukau, ka pahuhopu UL94 V-0)

ʻO ka hui pū ʻana o ka lapalapa ahi:

• Aluminum hypophosphite (AHP): 8-12 phr (waterborne polyurethane-coated type i paipai ʻia e hoʻoponopono i nā pilikia o ka ua)
• Aluminum hydroxide (ATH): 20-25 phr (submicron grade, 0.2-1.0 μm, e hoʻonui i ka helu oxygen a me ka hoʻopaʻa ʻana o ka char)
• MCA: 5-8 phr.
• Zinc borate: 3-5 phr (hoʻoikaika i ka hoʻokumu ʻana i ka ceramic char a pale i ka ʻā ʻana)

Hana i manaʻo ʻia:

• ʻO ka helu o ka oxygen (LOI): ≥32% (PU maʻemaʻe ≈22%);
• UL94 helu: V-0 (1.6 mm mānoanoa);
• ʻO ka hana wela wela: 0.45-0.55 W / m · K (i hāʻawi ʻia e ATH a me ka zinc borate);
• Ka mana viscosity: 25,000-30,000 cP (pono ka mālama ʻana i ka ʻili no ka pale ʻana i ka sedimentation).

Kaʻina hana kī:

• Pono e hoʻopuehu mua ʻia ka AHP i loko o ka ʻāpana polyol (Mahele A) e pale i ka hopena mua me ka isocyanate (Mahele B);
• Pono e hoʻololi ʻia ʻo ATH me kahi mea hoʻopili silane (e laʻa, KH-550) e hoʻoikaika i ka pilina pili.

2. Ka Ho'okumu 'ana i ke kumu kū'ai ha'aha'a (No ka ho'opa'a 'ana i ka sila, ka ho'opa'a 'ana i nā lako, ka pahuhopu UL94 V-1)

ʻO ka hui pū ʻana o ka lapalapa ahi:

• Aluminum hydroxide (ATH): 30-40 phr (maʻamau micron-grade, kumu kūʻai-pono, filler-type flame retardant);
• Ammonium polyphosphate (APP): 10-15 phr (hui pū me MCA no kahi ʻōnaehana intumescent, hoʻololi i nā mea hana halogenated);
• MCA: 5-7 phr (ratio to APP 1: 2 ~ 1: 3, hoʻolalelale i ka huʻa a me ka hoʻokaʻawale oxygen);
• Zinc borate: 5 phr (ka hoʻopau ʻana i ka uahi, ka hoʻokumu ʻana i ka char auxiliary).

Hana i manaʻo ʻia:

• LOI: ≥28%;
• UL94 helu: V-1;
• Ho'ēmi kumu kūʻai: ~ 30% (hoʻohālikelike ʻia me ka hoʻokumu ʻana i ke ahi-retardancy kiʻekiʻe);
• Ka paʻa ʻana o ka ikaika tensile: ≥80% (Pono ka APP i ka encapsulation e pale i ka hydrolysis).

Kaʻina hana kī:

• Pono e microencapsulated ka APP (e laʻa, me ka melamine-formaldehyde resin) i mea e pale ai i ka komo ʻana o ka makū a me ka hoʻokumu ʻana o ka ʻōpū;
• Hoʻohui i 1-2 phr hydrophobic fumed silica (e laʻa, Aerosil R202) no ka anti-settling.

3. Haʻahaʻa-Viscosity Easy-Process Formulation (No ka pololei uila hoʻopaʻa 'ia, koi kiʻekiʻe flowability)

ʻO ka hui pū ʻana o ka lapalapa ahi:

• Aluminum hypophosphite (AHP): 5-8 phr (nanosized, D50 ≤1 μm);
• ʻO ka wai ʻona phosphorus flame retardant (BDP ʻokoʻa): 8-10 phr (e laʻa, halogen-free phosphorus-based DMMP derivatives, mālama i ka viscosity);
• Aluminum hydroxide (ATH): 15 phr (spherical alumina composite, ke kaulike ana i ka thermal conductivity);
• MCA: 3-5 phr.

Hana i manaʻo ʻia:

• ʻO ka laulā viscosity: 10,000-15,000 cP (kokoke i nā ʻōnaehana pale ahi);
• Hoʻopaʻa ahi: UL94 V-0 (hoʻonui ʻia e ka phosphorus wai);
• ʻO ke kau wela wela: ≥0.6 W/m·K (hāʻawi ʻia e ka alumina spherical).

Kaʻina hana kī:

• Pono e hui pū ʻia ka AHP a me ka alumina spherical a hoʻopuehu ma lalo o ka ʻoki kiʻekiʻe (≥2000 rpm);
• E hoʻohui i ka 4-6 phr molecular sieve desiccant i ka Māhele B no ka pale ʻana i ka AHP moisture absorption.

4. Hoʻohui ʻia i nā kikoʻī loea a me nā mea hoʻonā ʻokoʻa

1. Nā Mechanism Synergistic:

• AHP + MCA:Hoʻolaha ʻo AHP i ka dehydration a me ka charring, ʻoiai ʻo MCA e hoʻokuʻu i ke kinoea nitrogen ma ka hoʻomehana ʻana, e hana ana i kahi papa honeycomb-like.
• ATH + Zinc borate:Hoʻopili ʻo ATH i ka wela (1967 J/g), a hana ka zinc borate i kahi papa aniani borate e uhi i ka ʻili.

2. Nā mea pale ahi ʻē aʻe:

• Nā mea i loaʻa i ka Polyphosphazene:ʻO ka maikaʻi kiʻekiʻe a me ka ʻoluʻolu, me ka hoʻohana ʻana i ka HCl huahana;
• Epoxy silicone resin (ESR):Ke hui pū ʻia me AHP, hoʻemi ia i ka hoʻouka ʻana (18% no V-0) a hoʻomaikaʻi i nā waiwai mechanical.

3. Kaʻina Hana Pilikia:

• Sedimentation:Pono nā mea kū'ē i ka hoʻoponopono (e like me nā ʻano polyurea-modified) inā ʻoi aku ka viscosity <10,000 cP;
• Hoʻopaʻa hoʻōla:Hōʻalo i nā mea hoʻopaneʻe ahi alkaline nui loa (e laʻa, MCA) i mea e pale ai i ka hoʻopilikia ʻana i nā hopena isocyanate.

5. Nā Manaʻo Hoʻokō

• Hana mua i ka ho'āʻo ʻana i ka hoʻokumu ʻana i ka hoʻohālua ʻana i ka lapalapa ahi nui: uhi ʻia ka AHP + submicron ATH (ka nui o nā ʻāpana ʻāpana 0.5 μm) ma AHP:ATH:MCA = 10:20:5 no ka loiloi mua.
• Nā hoʻāʻo nui:
  → LOI (GB/T 2406.2) a me UL94 ke ahi kū pololei;
  → Ka ikaika paʻa ma hope o ke kaʻa kaʻa wela (-30 ℃ ~ 100 ℃, 200 mau hola);
  → Ka ua hoʻopaʻa ahi ma hope o ka ʻelemakule wikiwiki (60 ℃/7d).

Papa Hoʻomumu ʻana i ka lapalapa ahi