Zogulitsa za polyurethane zofewa zofewa makamaka zimaphatikizapo chipika, chopitilira, siponji, thovu lolimba kwambiri (HR), thovu lodzipaka pakhungu, thovu lokhazikika pang'onopang'ono, thovu la microporous ndi thovu lolimba lomwe limatengera mphamvu.Chithovu chamtunduwu chimakhalabe pafupifupi 50% yazinthu zonse za polyurethane.Pali zinthu zosiyanasiyana ndipo kuchuluka kwa ntchito kukukulirakulirabe, ndipo akhala akuchita nawo magawo osiyanasiyana azachuma chadziko: zida zapakhomo, magalimoto, kukonza nyumba, mipando, masitima apamtunda, zombo, mlengalenga ndi zina zambiri.Chiyambireni chithovu chofewa cha PU m'zaka za m'ma 1950, makamaka atalowa m'zaka za zana la 21, ukadaulo, mitundu yosiyanasiyana, ndi kutulutsa kwazinthu zonse zadumphadumpha.Mfundo zazikuluzikulu zikuphatikizapo: chithovu chofewa cha PU, chomwe ndi chobiriwira cha polyurethane;otsika VOC mtengo PU zofewa thovu;otsika atomization PU zofewa thovu;madzi okwanira PU chithovu chofewa;zonse MDI mndandanda zofewa thovu;moto retardant, utsi wochepa, zonse MDI mndandanda thovu;Zowonjezera zatsopano monga zopangira polima, zolimbitsa thupi, zoletsa moto ndi ma antioxidants;polyols ndi otsika unsaturation ndi otsika monoal okhutira;ultra-otsika kachulukidwe PU flexible thovu ndi zabwino thupi katundu;otsika resonance pafupipafupi, Low-kutengerapo PU zofewa thovu;polycarbonate diol, polye-caprolactone polyol, polybutadiene diol, polytetrahydrofuran ndi ma polyols ena apadera;madzi CO2 thobvu luso, zoipa kuthamanga thobvu luso, etc. Mwachidule, zikamera wa mitundu yatsopano ndi umisiri watsopano walimbikitsa chitukuko zina za PU zofewa thovu.
Mfundo ya thovu
Kuti mupange thovu lofewa la PU lomwe limakwaniritsa zofunikira, ndikofunikira kumvetsetsa mfundo zamakina amtundu wa thovu kuti musankhe zida zazikulu ndi zothandizira zopangira ndi njira zopangira.Kukula kwa makampani a polyurethane sikulinso siteji yotsanzira, koma kumazindikirika kudzera muzopangira zopangira ndi kaphatikizidwe malinga ndi zomwe zimafunikira pakupanga komaliza.Polyurethane thovu nawo kusintha mankhwala pa kaphatikizidwe ndondomeko, ndi zinthu zimakhudza structural zimatha chithovu ndi zovuta, osati yokhudza mankhwala anachita isocyanate, polyether (ester) mowa ndi madzi, komanso umagwirira colloid wa thovu.Zotsatira za mankhwala zimaphatikizapo kufalikira kwa unyolo, kutulutsa thovu ndi kulumikizidwa.Zimakhudzanso mapangidwe, ntchito ndi kulemera kwa maselo a zinthu zomwe zimakhudzidwa ndi zomwe zimachitika.Zomwe zimachitika pakuphatikizika kwa thovu la polyurethane zitha kuwonetsedwa ndi njira iyi:
Nthawi yotumiza: Sep-06-2022