polyurethane Full taʻua polyurethane, o faatasi taulotoina vaega urethane (NHCOO) lotoa macromolecular o loo i ai i le faasologa o autu. E faia mai se diisocyanate faatulagaina po o lotoa polyisocyanate ma polyaddition lua po o le sili hydroxyl. O le fua faatatau nei tali: -N = F = Le + HO- → -NH-COO-, e faaopoopo i le polyurethane carbamate macromolecule, e mafai ona aofia ai foi i le Eteru, ester, urea, biuret, allophanate, ma isi vaega.
(Cyanate
Faamatalaga: HOC≡N (n) cyanate HN = F = Le (isocyanate) ei ai se (lelei) cyanate ma isocyanate ituaiga e lua. O le acid saoloto o se tuufaatasiga o faasalaga uma e lua, e amata tuueseeseina, ae e lua ituaiga lona esters. Cyanate o suavai le mautonu ma le matautia. E i ai se manogi malosi o le acid acetic. Density 1,14. Pupuna tulaga 23,6 ℃. Faaali acidity malosi i fofo aqueous. Mautu, faigofie polymerization. Amonia ma karaponi carbon faatupulaia i le taimi o hydrolysis. Pe a faatupuina carbamates ma alcohols matafaioi. (N) isocyanate ROC≡N polymerization faigofie, ma e lilifa atu i hydrolysis, sa maua ai i se faiga mama faigata. Isocyanate RN = F = E, po o le Le = F = NRN = F = E, manogi masani le lelei i se suavai. mafai ona saunia Cyanate acid cyanuric e decomposition vevela. )
oloa Polyurethane fausia vaivai, semi-maumaututū ma foams maumaututū, elastomers, paints, adhesives, sealants, resins ufiufi paʻu gaosi, alava elastomeric, lautele faaaoga i le gaosiga o taavale, o fale gaosi oloa pusaaisa, femalagaiga, fausiaina enisinia o vaalele, seevae, paʻu gaosi, lavalava, masini, petrochemical, laʻuina o masini, aerospace, faafomai, faatoaga ma le tele o isi fanua.
E faalagolago i le mea e masani eseese, e mafai ona eseese ituaiga o oloa, e masani lua ituaiga o polyester ma polyether. polyurethane Polyether o mafuli sauniuniga mea polyurethane faamatalaina mo polyol, o se polyurethane polyol faapea ua saunia atoa mai polyether polyol po o se vaega toatele o umia i le faiga.
Polyether polyols i le faatulagaga molecular, o se malosi tuufaatasi fusi Eteru e maualalo, ma le faigofie ina ia feauauaʻi, o lea o se mea polyurethane lelei maualalo vevela saunia e lana faatinoga supple, lelei tetee hydrolysis, e ui lava e lelei e pei o meatotino masini o polyester polyurethane, ae maualalo mea ogatasi, vaega faigofie ma isocyanate faaopoopo miscible, faatinoga gaosi lelei.
e masani lava o lo o faasinomia i polyols Polyester e se acid dicarboxylic ma se glycol ma isi polyol polyester e tali totoʻoga. Lautele o loo i ai vaega ester (COO) po o se vaega carbonate (OCOO) polyol. o loo faaaogaina faalauaitele foams Polyurethane. ua mafua faaaogaina foam Filemu mo meaafale ma taavale o mea eseese fala, mea faʻaʻesega; faʻaʻesega foam maumaututū ua mafuli faaaoga mo mea faigaluega e aiga, fale faʻaʻesega foam pasī waterproofing puipui, mea faʻaʻesega paipa, fale panels, refrigerated loli ma faʻaʻesega malulu teuina ma isi mea; foam semi-maumaututū faaaogaina i panels meafaigaluega tautaavale, foeuli ma isi. O le maketi ua a auiliili eseese mo tuufaatasiga foam polyurethane o mea (premix lua vaega), faapitoa mo le (fofo malulu) foams maualuga maufetuunaʻi, foams semi-maumaututū, tutuina ma spraying palasitika foam faigata.
(Eteru Diethyl
1. A o se tuufaatasiga o ethanol ma faasagatonu acid sulfuric na faamafanafana e 140 ℃ mafai intermolecular oloa dehydration ma Eteru. Faasagatonu acid sulfuric o se sui sooupu dehydrating ai le vaega taua.
2. faaupuga: 2 CH3-CH2-Oi - catalyzed ma taulai H2SO4 → i 140 ℃ CH3-CH2-O-CH2-CH3 + H2O)
elastomer Polyurethane
elastomer Polyurethane o se mea tuʻufaʻatasi polyurethane o le a eseese, ona o lona fausaga i le vaivai ma faigata vaega e lua, e mafai ona fuafuaina e faasoa atu mea molecular ua i ai se malosi sili, maʻaʻa, e laei e tetee, tetee suauu, faatinoga o galuega e sili ona lelei, e le gata i le paʻu ua maualuga elasticity ma rigidity o palasitika, e taʻua "ofu-e tetee paʻu."
i le taimi nei e mafai ona elastomer Polyurethane faaaogaina le mastication paʻu aoao lava e tasi, palu, faamalolo faagasologa faaleleia (faasino MPU); foi ona faia i paʻu suavai, lafo faaleleia po o spraying, faaiuga, faaleleia centrifugal (faasino i CPU); e mafai ona saunia foi i pellets, ma, e pei o palasitika masani, tui, puna, calendering, ta faaleleia ma isi faagasologa (o CPU). Faaleleia po o le tui vaega mamanuina, i totonu o se vaega faapitoa o le maaa, ae e mafai ona vavae foi, olo, viliina ma isi machining. Gaosia o eseese, o le polyurethane elastomer lava lautele faaaogaga, e faaauau pea i talosaga faalautele.
tetee suauu, tetee osone, matutua tetee, tetee leisa, vevela maualalo, lelei le leo manino, adhesion malosi, lelei biocompatibility ma le tulaga ogatasi toto. O nei tulaga lelei o le polyurethane elastomer faaaogaina faalauaitele i le militeli, aerospace, acoustics, paiolo ma isi mafuaaga.
O le lelei autu o elastomer polyurethane:
1, o le faatinoga o le tele ma faʻafetauina. O se aofaiga o faailoga faatinoga faaletino ma masini e mafai ona fetuunai i le filifilia o mata o mea ma formulations, i totonu o se ituaiga faapitoa, e faafetaiai i le manaoga eseese mo faatinoga oloa. E pei o le maaa, e masani lava o se faailoga taua o le tagata e faaaogāina o le oloa, i le faia o polyurethane elastomer Shore A maaa o le 20 po o ina rollers vaivai lomitusi, ae faia foi silia i le 70 Shore MF maaa oo faataamilo faasee faigata paʻu, o se elastomeric aoao o lenei i mea faigata faia. elastomer Polyurethane o se mea polymer polar aofia ai le tele o vaega ma vaega faigata aofia filifili fetuutuunai, ma o le a faateleina e tusa ai le faaleleia ma le siitia o le density vaega polar vaega vaega faigata o le malosi uluai elastomer ma maaa.
2, tetee sili laei. Aemaise lava pe afai o loo i ai vai, suauu wetting auala o lo oi ai tulaga o galuega, o le laei tetee e masani lava o le tele o taimi i le tele o taimi le mea masani paʻu. mea apamemea e pei o le uamea, e ui lava malosi, ae le o faia, e pei o nofoaga e fui pamu tele o le Vaitafe o lanu samasama, o le mama mama overcurrent gutu vaega ma uamea puipuiga ina ua mavae le tele o taeiʻa tafia, e le ave le faitau selau o itula e ogaoga ofuina leakage, ao le faaaogaina o polyurethane elastomer mama gutu coated ma mama puipuiga o le faagaoioiga faifai pea 1800 i se tamai ae ofuina. O isi, e pei o le araisa milling masini hulling faasee paʻu faaaogaina, vibrating screen faamama koale Sauniuniga ma ala vaalele malae, faamaufaailoga maoae suauu faaaoga uili lifi autilo forklift ma uili skates faasee, ma isi foi elastomer polyurethane E oo mai i totonu. I lenei taimi o faasinomaga manaomia e faaleleia ai le coefficient o eseesega o le maualalo-maaa tagata elastomer polyurethane, e faaleleia ofu tetee i lalo o avega aafiaga, e mafai ona faaopoopo se aofaiga itiiti o alumini disulfide, graphite po o suauu silicone i se elastomer polyurethane, ma isi uʻu.
taimi Post: Nov-24-2018