Sebopeho sa Litšupiso tsa PBT tse se nang Halogen tse Sireletsang Mollo

Sebopeho sa Litšupiso tsa PBT tse se nang Halogen tse Sireletsang Mollo

Ho ntlafatsa tlhahiso ea li-halogen-flame retardants bakeng sa PBT, ho bohlokoa ho leka-lekanya katleho ea ho lieha ha mollo, botsitso ba mocheso, ho lumellana ha mocheso oa ts'ebetso, le litšobotsi tsa mechini. Ka tlase ke leano le ntlafalitsoeng la ho kopanya ka tlhahlobo ea bohlokoa:

1. Metswako e Sireletsang Mollo oa Motheo

Khetho ea 1: Aluminium Hypophosphite + MCA (Melamine Cyanurate) + Zinc Borate

Mokhoa:

• Aluminium Hypophosphite (Botsitso ba Thermal > 300°C): E khothalletsa ho thehoa ha char karolong e khutsufalitsoeng mme e lokolla li-radical tsa PO· karolong ea khase ho sitisa liketso tsa ketane ea ho tuka.
• MCA (Ho bola ha ~300°C): Ho bola ha endothermic ho lokolla dikhase tse sa sebetseng (NH₃, H₂O), ho ntsha dikhase tse tukang le ho thibela ho rotha ha metsi ho qhibilihisang.
• Zinc Borate (Ho bola > 300°C): E ntlafatsa ho thehwa ha char e kang khalase, e fokotsa mosi le khanya e latelang.

Karolelano e Khothaletsoang:

• Aluminium Hypophosphite (10-15%) + MCA (5-8%) + Zinc Borate (3-5%).

Khetho ea 2: Magnesium Hydroxide e Fetotsoeng holim'a metsi + Aluminium Hypophosphite + Organic Phosphinate (mohlala, ADP)

Mokhoa:

• Magnesium Hydroxide e Fetotsoeng (Ho bola ~300°C): Kalafo ea bokaholimo (silane/titanate) e ntlafatsa ho hasana le botsitso ba mocheso; ho pholisa ha endothermic ho fokotsa mocheso oa thepa.
• Phosphinate ea Organic (mohlala, ADP, botsitso ba mocheso > 300°C): E thibela malakabe a khase ka katleho e phahameng, e sebelisanang le litsamaiso tsa phosphorus-nitrogen.

Karolelano e Khothaletsoang:

• Magnesium Hydroxide (15-20%) + Aluminium Hypophosphite (8-12%) + ADP (5-8%).

2. Li-synergists tse ikhethileng

• Nano-clay/Talc (2-3%): E ntlafatsa boleng ba char le thepa ea mechine ha e ntse e fokotsa mojaro o thibelang malakabe.
• PTFE (0.2-0.5%): Sehlahisoa se thibelang ho rotha ho thibela marotholi a tukang.
• Phofo ea Silicone (2-4%): E khothalletsa ho thehoa ha char e teteaneng, e eketsa ho lieha ha lelakabe le ho benya ha bokaholimo.

3. Metswako eo U Lokelang ho e Qoba

• Aluminium Hydroxide: E bola ho 180-200°C (ka tlase ho mocheso oa ts'ebetso ea PBT oa 220-250°C), e leng se lebisang ho senyehang pele ho nako.
• Magnesium Hydroxide e sa fetoloang: E ​​hloka kalafo ea bokaholimo ho thibela ho kopana le ho bola ha mocheso nakong ea ts'ebetso.

4. Malebela a Ntlafatso ea Tshebetso

• Kalafo ea Bokaholimo: Sebelisa li-sylane coupling agents ho Mg(OH)₂ le zinc borate ho ntlafatsa ho hasana le ho kopana ha lifahleho.
• Taolo ea Mocheso oa Ts'ebetso: Netefatsa hore mocheso oa ho bola ha lelakabe o thibelang malakabe o feta 250°C ho qoba ho senyeha.
• Tekanyo ea Thepa ea Mekaniki: Buseletsa tahlehelo ea matla ka ho sebelisa li-nano-fillers (mohlala, SiO₂) kapa li-tougheners (mohlala, POE-g-MAH).

5. Mohlala oa ho qapa

6. Litekanyo tsa Bohlokoa tsa Teko

• Ho Thibela Lelakabe: UL94 V-0 (1.6mm), LOI > 35%.
• Ho Tsitsisa ha Thempereichara: Masalla a TGA > 25% (600°C).
• Litšobotsi tsa Mekaniki: Matla a ho thapolla > 45 MPa, tšusumetso e sa koaheloang > 4 kJ/m².

Ka ho lokisa dikarolelano hantle, ho thibela mollo o se nang halogen ka bokgoni bo phahameng ho ka fihlellwa ha ho ntse ho bolokwa tshebetso ya PBT ka kakaretso.

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