Iplastiki yePolyurethane (PU)
* I-Polyurethane (PU) sisifinyezo se-polyurethane, i-polyisocyanate kunye ne-polyhydroxy polymer polymerization, ikwikhonkco eliphambili lee-polymers eziqulethe ii-repetitive urethane chain segments (-NHCOO-) zee-polymer compounds.
* Iimveliso zeplastiki zePU ezenziwe ngokwezifiso
I-Polyurethane, eyaziwa ngokuba yi-polyurethane kunye ne-polyurethane, luhlobo lwee-macromolecules eziqulathe iiyunithi ze-urethane kwikhonkco eliphambili. Olu hlobo lwezinto ze-polymer lunokuthamba kwerabha kunye namandla kunye nokusebenza kakuhle kokucubungula kweplastiki, kwaye lunexabiso elibalulekileyo lokusetyenziswa kwiindawo ezisixhenxe eziphambili zeplastiki, irabha, i-foam, i-fiber, ii-coating, i-adhesives kunye nee-polymers ezisebenzayo. Kwishishini isetyenziswa kakhulu kwiitayara ezinesantya esiphantsi, ii-gaskets, ii-car mats kunye nezinye iindawo. Kubomi bemihla ngemihla, i-polyurethane isetyenziselwa ukwenza iintlobo ezahlukeneyo ze-foam kunye ne-plastic sponge.
Yintoni onokuyenza ngePU Plastiki?
Ii-elastomers zePolyurethane ziluhlobo lwezixhobo ezineempawu zerabha kunye neplastiki, zinamandla okutsalwa kakuhle, amandla okukrazula, ukumelana nempembelelo, ukumelana nokukrweleka, ukumelana nemozulu, ukumelana ne-hydrolysis, ukumelana neoyile kunye nezinye izibonelelo.
Isetyenziswa kakhulu njengezixhobo zokwakha (ezifana neepayipi, ii-gasket, iibhanti, ii-roller, iigiya, iipayipi, njl.njl.), ii-insulator, izihlangu kunye namatayara aqinileyo. Umzekelo, njengepleyiti yesihluzo semigodi, ingxolo yayo iphantsi, ingena kakhulu kwaye ayigugi kunepleyiti yesihluzo sesinyithi sendabuko. Ukongeza, i-polyurethane ihambelana kakuhle ne-biochemical, njengesixhobo se-biomedical, ingasetyenziswa kwi-pacemakers, kwimithambo yegazi yokwenziwa, kwithambo lokwenziwa, njl.njl.
Nazi ezinye zezicelo zePolyurethane (PU)
- Uthutho
- Ulwakhiwo
- Oomatshini
- Izixhobo ze-elektroniki
- Ifenitshala
- Ukulungiswa kokutya
- Impahla yelaphu kunye nempahla
- Ulusu oluyilwe ngokwenziwa
- Ukuprinta
- Ishishini le-Petrochemical
- Ezemidlalo
- Ukhathalelo lwempilo
Iimpawu zePolyurethane (PU)
* I-polyurethane foam yahlulwe yaba ziintlobo ezimbini: i-rigid foam kunye ne-flexible foam, enobuthambileyo obuhle, ubude, amandla okucinezelwa kunye nokuguquguquka, kunye nozinzo oluhle lweekhemikhali. Ukongeza, i-polyurethane foam inokusebenza kakuhle, ukunamathela, ukufudumala kunye nezinye iimpawu, ezihambelana nokusebenza kakuhle kwezinto zokuthambisa.
Ngenxa yesakhiwo sayo, i-polyurethane elastomer ineenxalenye ezimbini zetyathanga ezithambileyo neziqinileyo, ngoko ke ityathanga lemolekyuli linokuyilwa ukunika izinto ezo amandla aphezulu, ukuqina okuhle, ukumelana nokuguguleka, ukumelana neoyile kunye nezinye iipropati ezintle, ezaziwa ngokuba yi-"rubber-resistant" polyurethane ngaxeshanye kunye nokuqina okuphezulu kwerabha kunye nokuqina kweplastiki.
* Izinto zePolyurethane zine-polarity enamandla, nto leyo eyenza zikwazi ukubopha ngokuqinileyo nezinye izinto kwaye zingasetyenziswa njengezincamathelisi kwicandelo lokubopha.
* Izincamathelisi zepolyurethane zisetyenziswa kakhulu kwimizi-mveliso yokupakisha, yokwakha, yomthi, yeemoto, neyezihlangu.
Zenziwa njani izinto zePolyurethane (PU)?
Ngenxa yokuba i-polyurethane ayingeni manzi kakhulu, kufuneka kusetyenziswe indlela entsha yokwenza izinto ukulungiselela i-PU emulsion, inkqubo yokwenza izinto ye-polyurethane eqhutywa ngamanzi ikakhulu yile ilandelayo: ① yi-oligomer polyol, i-chain extender, i-diisocyanate ukwenza ubunzima obukhulu be-PU pre-polymer; ② inganyanzelwanga emva kokuba i-pre-polymer ixutywe emanzini ukwenza i-dispersion.
Iindlela zokulungiselela i-polyurethane emulsion zineentlobo ezimbini eziphambili: indlela ye-external emulsification kunye nendlela ye-internal emulsification.
1. Indlela ye-emulsification yangaphandle yindlela ye-emulsification enyanzelisiweyo xa kukho i-emulsifier, i-high shear.
2. Indlela yokuzixuba ngokwayo yenziwa ngokungenisa amaqela athanda amanzi kwi-molecule skeleton ye-polyurethane.
Amaqela athanda i-hydrophilic angeniswa kwi-PU molecular skeleton ngokwandiswa kwe-chain ye-hydrophilic monomers, ezakhiwe ngamaqela enza ityuwa kunye nee-reagents ezenza ityuwa.
Ukuphinda usebenzise iplastiki yePolyurethane (PU)
- Ukuphinda usebenzise iplastiki yePolyurethane (PU) Ingahlulwahlulwa ibe kukuphinda usebenzise iplastiki ngokwasemzimbeni nangokweekhemikhali.Ukuphinda usebenzise izinto ngokoqobo kunika indlela esebenzayo nengabizi kakhulu yokuphinda usebenzise izinto eziqinileyo ze-polyurethane kunye nee-composites. Ubungakanani bezinto ezisetyenzisiweyo ze-polyurethane foam yokuqala buqala buncitshiswe bufikelele kwinqanaba elinokuthi liphinde lisetyenziswe kwiinkqubo zesibini. Izinto ezisetyenzisiweyo ezisetyenzisiweyo, okanye izinto ezicociweyo kwinkqubo yokuvelisa, ziyawohloka zibe ziindlela eziluncedo ngakumbi ezifana nee-flakes, ii-granules okanye ii-powders.Ukuphinda kusetyenziswe iikhemikhali yindlela yokuqhekeza amagwebu e-polyurethane abe zizinto eziluhlaza ze-polyurethane okanye ezinye izinto eziluhlaza zekhemikhali kusetyenziswa i-alcoholysis, i-amineysis, i-hydrolysis okanye i-pyrolysis. I-polyurethane foam ineebhondi ze-urethane kunye ne-urea. Kwinkqubo ye-alcoholysis, i-aminolysis kunye ne-alkali hydrolysis, iibhondi ze-urethane kunye ne-urea kwi-polyurethane molecule ziyaqhekeka kwaye ziqhekeke zibe zii-polyols, ii-polyamines ezinuka kamnandi, i-carbon dioxide njalo njalo.
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