Polyurethane Yakagadzirwa Nepolyester (Polyester TPU)

# ## 1. Tsananguro YekutangaTPU yakavakirwa papolyester(Polyester TPU) rudzi rweelastomer yethermoplastic polyurethane, copolymer ine zvidimbu zvakapatsanurwa. Zvikamu zvayo zvakapfava zvinonyanya kubva ku **polyester polyols** (semuenzaniso, polyadipate glycol, PAG), inoumbwa ne polycondensation ye adipic acid (AA) uye diols (semuenzaniso, 1,4-butanediol, BDO). Ndiyo imwe yemhando mbiri huru dzeTPU, pamwe chete neTPU yakavakirwa papolyether.

## 2. Maumbirwo eKemikari & Kugadzirwa ### Zvinhu Zvikuru Zvisina Kugadzirwa – **Diisocyanate**: Kazhinji **4,4′-diphenylmethane diisocyanate (MDI)** (≈40% yekugadzirwa). – **Polyester Polyol (Chikamu Chinyoro)**: Yakagadzirwa kubva ku **adipic acid (AA)** (≈35%) uye **1,4-butanediol (BDO)**. – **Chain Extender (Chikamu Chinyoro)**: Short-chain diol, kazhinji **1,4-butanediol (BDO)** (≈25%). ### Polymerization Mechanism Polyester TPU inogadzirwa kuburikidza ne **step-growth polymerization** reaction: 1. Polyester polyol (chikamu chakanyorova) inobatana neMDI kuti igadzire prepolymer ine mapoka ekupedzisira eisocyanate. 2. Prepolymer inobva yawedzerwa neBDO, zvichigadzira **zvikamu zvakaoma** (MDI-BDO) uye **zvikamu zvakapfava** (polyester polyol). 3. Kubatana kwakasimba kwehydrogen pakati pemamorekuru** kunoitika pakati pemapoka epolar ester (-COO-) muzvikamu zvakapfava uye mapoka eurethane (-NHCOO-) muzvikamu zvakaoma, zvichiita network ye physical crosslink.

## 3. Hunhu Hunokosha ### Hunhu hweMichina – **Simba Rakasimba reKubata uye Kubvaruka**: Rakanaka kupfuura polyetherTPU, nekuda kwekubatana kwakasimba kwepolar uye hydrogen bonding. – **Kuramba Kunorema Kwakanaka**: Chimwe chezvinhu zvaro zvinoshamisa, chakanakira kushandiswa kwepamusoro-soro. – **Zvinhu Zvakanaka zveFlexural & Compressive**: Kusimba kwakanyanya uye kugona kutakura mutoro. – **Kusimba Kwakafara**: Inogona kugadzirwa kubva kuShore A 60 kusvika kuShore D 80, ichienzanisa kusimba uye kuomarara. ### Kuramba Kwemakemikari Nezvakatipoteredza – **Kuramba Kwakanaka Kwemafuta Nemafuta**: Inodzivirira zvakanyanya kune zvisiri zvepolar solvents, mafuta, uye mafuta ekuzora. – **Kuramba Kwakanaka kweSolvent**: Inodzivirira kune zvakawanda organic solvents (semuenzaniso, alcohols, esters). – **Kuramba Kupisa Pakati Nepakati**: Kusimba kwakanaka kwekupisa, kwakakodzera kushandiswa nguva dzose patembiricha inosvika 80–100°C. – **Kuramba Kusina Kusimba kweHydrolysis**: Ma ester bonds anogona kutsemuka nemvura, kunyanya munzvimbo dzinopisa, dzine hunyoro, zvichikonzera kuora kwepfuma. – **Kusimba Kusina Kusimba Kwekupisa Kushoma**: Inova yakaoma uye inopwanyika patembiricha iri pasi pe -20°C. ### Zvimwe Zvimiro – **Kujeka Kwakanaka**: Magiredhi akajeka kana anopenya anowanikwa. – **Kuenderana Kwakanaka**: Inoenderana nema polar polymers akadai sePVC, zvichiita kuti zvive nyore kusanganisa nekugadzirisa.

## 4. Mashandisirwo Akajairika Polyester TPU inoshandiswa zvakanyanya munzvimbo dzinoda simba guru remakanika, kuramba kukwesha, uye kuramba mafuta: – **Indasitiri & Uinjiniya**: Mabhandi eConveyor, mahosi ehydraulic, zvisimbiso, magasket, maroller, uye zvikamu zvisingapfeki. – **Shangu**: Zvikamu zvekunze, midsoles, uye shangu kuti dzigare kwenguva refu uye dzisapfekirwe nemafuta. – **Motokari**: Kushongedza kwemukati, tambo yejaketi, ma airbag covers, uye zvikamu zvefuel system. – **Coatings & Adhesives**: Kupfeka kwepamusoro-soro kwemachira, simbi, uye mapurasitiki; adhesives echimiro. – **Waya & Cable**: Kupfeka jekete remaindasitiri kunoda kuramba mafuta nekukwesha. – **Mitambo & Varaidzo**: Bhutsu dzeski, mavhiri eskate ari mumutsara, uye zvikamu zvemidziyo yemitambo.

## 5. Kuenzanisa nePolyether TPU | Hunhu | Polyester TPU | Polyether TPU | |:— |:— |:— | | **Chikamu Chinyoro** | Polyester polyol (semuenzaniso, PAG) | Polyether polyol (semuenzaniso, PTMEG) | | **Simba Rekusimba** | Yakakwira | Iri Pakati Nepakati | | **Kuramba Kukwesha** | Yakanaka | Yakanaka | | **Kuramba Mafuta/Kunyungudutsa** | Yakanaka | Iri Pakati Nepakati | | **Kuramba Kunobva Hydrolysis** | Yakashata | Yakanaka | | **Kuchinjika Kunopisa Kwakaderera** | Yakashata | Yakanaka | | **Mutengo** | Yakaderera | Yakakwira |

## 6. Kugadzirisa & Kubata – **Nzira Dzekugadzirisa**: Inogona kugadziriswa uchishandisa nzira dzakajairwa dzethermoplastic: kuumba nejekiseni, kuburitsa, kuumba nemhepo, uye kuumba calender. – **Zvinodiwa Pakuomesa**: Inofanira kuomeswa zvakanaka (80–100°C kwemaawa 2–4) isati yagadziriswa kudzivirira hydrolysis uye bubbling. – **Kupisa Kwekuumba**: Kazhinji 180–220°C, zvichienderana nerudzi rwayo uye kuoma kwayo.

## 7. Zvakanakira & Zvisina Kukwana ### Zvakanakira - Simba remakanika risingawanzoonekwi uye kuramba kukwesha. - Kuramba mafuta nemakemikari zvakanaka. - Kuenderana zvakanaka nezvinhu zve polar. - Mutengo wakaderera kana tichienzanisa ne polyether TPU.