I-Polyester-Based Thermoplastic Polyurethane (i-Polyester TPU)

# ## 1. Inkcazo esisisekoI-TPU esekwe kwiPolyester(iPolyester TPU) luhlobo lwei-thermoplastic polyurethane elastomer, i-copolymer yebhloko ehlukanisiweyo ethe tyaba. Iinxalenye zayo ezithambileyo zithathwe ikakhulu kwi-**polyester polyols** (umz., i-polyadipate glycol, i-PAG), eyenziwe yi-polycondensation ye-adipic acid (AA) kunye ne-diols (umz., i-1,4-butanediol, i-BDO). Yenye yeendidi ezimbini eziphambili zeI-TPU, ecaleni kweTPU esekwe kwi-polyether.

## 2. Ulwakhiwo lweeKhemikhali kunye nokwenziwa ### Izinto ezisisiseko – **Diisocyanate**: Ngokwesiqhelo **4,4′-diphenylmethane diisocyanate (MDI)** (≈40% yefomyula). – **Polyester Polyol (Icandelo elithambileyo)**: Yenziwe kwi **adipic acid (AA)** (≈35%) kunye ne **1,4-butanediol (BDO)**. – **Isandisi seChain (Icandelo elinzima)**: I-Short-chain diol, ngokwesiqhelo **1,4-butanediol (BDO)** (≈25%). ### I-Polymerization Mechanism I-Polyester I-TPU yenziwe nge-**i-step-growth polymerization**: 1. I-polyester polyol (icandelo elithambileyo) isabela kwi-MDI ukuze yenze i-prepolymer enamaqela esiphelo se-isocyanate. 2. Emva koko i-prepolymer yongezwa nge-chain nge-BDO, idala ii-**segments eziqinileyo** (MDI-BDO) kunye nee-**segments ezithambileyo** (polyester polyol). 3. Ukudityaniswa kwe-hydrogen okunamandla** kwenzeka phakathi kwamaqela e-polar ester (-COO-) kwii-segments ezithambileyo kunye namaqela e-urethane (-NHCOO-) kwii-segments eziqinileyo, okwenza inethiwekhi ye-crosslink ebonakalayo.

## 3. Iimpawu Eziphambili ### Iimpawu Zoomatshini – **Ukuqina Okuphezulu Nokukrazuka**: Zingcono kune-polyetherI-TPU, ngenxa yokusebenzisana okunamandla kwe-polar kunye nokubophelelana kwe-hydrogen. – **Ukumelana Okuhle Kokukrala**: Enye yezona mpawu zayo zibalaseleyo, ifanelekile kwizicelo ezigugileyo. – **Iimpawu Ezilungileyo Zokugobeka Nokucinezela**: Ukuqina okuphezulu kunye nomthamo wokuthwala umthwalo. – **Uluhlu Olubanzi Lobunzima**: Ingakhiwa ukusuka kwi-Shore A 60 ukuya kwi-Shore D 80, ilungelelanise ukuthamba kunye nokuqina. ### Ukumelana Neekhemikhali Nokusingqongileyo – **Ukumelana Okuhle Kweoyile Negrisi**: Imelana kakhulu nezinyibilikisi ezingezizo ze-polar, amafutha, kunye neeoyile zokuthambisa. – **Ukumelana Okuhle Kwesinyibilikisi**: Imelana nezinyibilikisi ezininzi zendalo (umz., ii-alcohols, ii-esters). – **Ukumelana Okuphakathi Kobushushu**: Uzinzo oluhle lobushushu, lufanelekile ukusetyenziswa rhoqo kumaqondo obushushu afikelela kwi-80–100°C. – **Ukumelana Okubi Kwe-Hydrolysis**: Izibophelelo ze-ester zisengozini yokuqhekeka ngamanzi, ingakumbi kwiindawo ezishushu nezifumileyo, nto leyo ekhokelela ekuwohlokeni kwepropathi. – **Ukuguquguquka Okubi Kobushushu Obuphantsi**: Iba lukhuni kwaye ibe buthathaka kumaqondo obushushu angaphantsi kwe-20°C. ### Ezinye Iimpawu – **Ukucaca Okuhle**: Kukho amanqanaba acacileyo okanye akhanyayo. – **Ukuvumelana Okuhle**: Iyahambelana neepolima ze-polar ezifana ne-PVC, nto leyo eyenza kube lula ukudibanisa nokuguqula izinto.

## 4. Iinkqubo eziqhelekileyo I-Polyester TPU isetyenziswa kakhulu kwiindawo ezifuna amandla aphezulu oomatshini, ukumelana nokukrweleka, kunye nokumelana neoyile: – **Imizi-mveliso kunye nobunjineli**: Iibhanti zeConveyor, iipayipi zehydraulic, izitywini, iigasket, iirola, kunye neendawo ezingagugiyo. – **Iingubo**: Izinto zangaphandle, ii-midsoles, kunye nezixhobo zezihlangu zokuqina kunye nokumelana neoyile. – **Iimoto**: Ukuhlobisa kwangaphakathi, i-cable jacketing, izigqubuthelo ze-airbag, kunye nezixhobo zenkqubo yepetroli. – **Iingubo kunye neeAdhesives**: Iingubo ezisebenza kakuhle zelaphu, iintsimbi, kunye neeplastiki; izincamathelisi zesakhiwo. – **Iingcingo kunye neCable**: Ijacket kwiintambo zoshishino ezifuna ukumelana neoyile kunye nokukrweleka. – **Imidlalo kunye noLonwabo**: Izihlangu zeSki, amavili e-skate angaphakathi, kunye nezixhobo zezemidlalo.

## 5. Uthelekiso nePolyether TPU | Ipropati | IPolyester TPU | IPolyester TPU | |:— |:— | | **Icandelo elithambileyo** | IPolyester polyol (umz., PAG) | IPolyether polyol (umz., PTMEG) | | **Amandla okuThamba** | Phezulu | Phakathi | | **Ukuxhathisa ukurhawuzelelwa** | Kugqwesile | Kulungile | | **Ukuxhathisa iOyile/iSolvent** | Kugqwesile | Phakathi | | **Ukuxhathisa iHydrolysis** | Kubi | Kugqwesile | | **Ukuguquguquka kobushushu obuphantsi** | Kubi | Kugqwesile | | **Ixabiso** | Phantsi | Phezulu |

## 6. Ukucubungula kunye nokuphatha – **Iindlela zokucubungula**: Ingacutshungulwa kusetyenziswa iindlela eziqhelekileyo ze-thermoplastic: ukubumba ngenaliti, ukukhupha, ukubumba ngokuvuthela, kunye nokufaka iikhalenda. – **Imfuneko yokomisa**: Kufuneka yomiswe kakuhle (80–100°C kangangeeyure ezi-2–4) ngaphambi kokucubungula ukuthintela i-hydrolysis kunye nokubhabha. – **Ubushushu bokubumba**: Ngokwesiqhelo yi-180–220°C, kuxhomekeke kudidi oluthile kunye nobunzima.

## 7. Iingenelo kunye nokunqongophala ### Iingenelo – Amandla angaqhelekanga oomatshini kunye nokumelana nokurhawuzelelwa. – Ukumelana okugqwesileyo kweoyile kunye neekhemikhali. – Ukuhambelana okuhle nezinto ze-polar. – Ixabiso eliphantsi xa lithelekiswa ne-polyether TPU.