Polyurethane e phekotsoeng ke Mongobo ke eng

Polyurethane e phekotsoeng ke Mongobo ke eng

Polyurethane e entsoeng ka mongobo ke karolo e le 'ngoe ea polyurethane eo pheko ea eona e qalang e le mongobo oa tikoloho. Polyurethane e phekolehang ka mongobo haholo-holo e na le polymer ea isocyanate e felisitsoeng. Mefuta e fapaneng ea pre-polymer e ka sebelisoa ho fana ka thepa e hlokahalang. Mohlala, li-polyether polyether polyols tsa isocyanate li sebelisoa ho fana ka maemo a bonolo ka lebaka la mocheso oa tsona o tlase oa phetoho ea likhalase. Ho kopanya karolo e bonolo, joalo ka polyether, le karolo e thata, joalo ka polyurea, e fana ka boima bo botle le ho feto-fetoha ha liphahlo. Ho feta moo, thepa e boetse e laoloa ka ho khetha mefuta ea li-isocyanate ho kenyelletsa le pre-polymer.

Mefuta e 'meli ea mantlha ea li-isocyanate ke isocyanate e nkhang hamonate le aliphatic isocyanate. Aromatic isocyanate e na le reactivity e phahameng. Leha ho le joalo, ha e tšoarelle hantle ka ntle le ho fifala ho matla. Mehlala e meng ea li-isocyanate tse nkhang hamonate ke toluene diisocyanate(TDI) le 4,4'diphenylmethane diisocyanate(MDI). Ka lehlakoreng le leng, aliphatic isocyanate, joalo ka, isophorone diisocyanate (IPDI), e fana ka boemo bo botle ba leholimo le boemo ba leholimo. mmala ho boloka; Leha ho le joalo, reactivity ea aliphatic isocyanate e tlase, kahoo li-catalysts tse ling li ka hlokoa. Ka hona, mefuta ea isocyanate e bohlokoa ho fihlela thepa e lakatsehang. Ho feta moo, li-additives, solvents, pigments, joalo-joalo li ka eketsoa ho latela kopo. Leha ho le joalo, thepa e tala bakeng sa polyurethanes e phekotsoeng ka mongobo e tlameha ho laoloa hore e se be mongobo e le ho fumana botsitso bo botle ba polokelo le thepa ea filimi.

Molemo o mong oa polyurethane e phekolehang ka mongobo ke hore ke karolo e le 'ngoe. Ka hona, ho bonolo ho e sebelisa kaha ha ho na tekanyo e nepahetseng ea ho kopanya e hlokahalang, ha e bapisoa le liaparo tse nang le likarolo tse peli. PU e phekotsoeng ka mongobo e kopantsoe ke karabelo ea Isocyanate e felisitsoeng pele ho polymer le metsi moeeng, e hlahisang li-amine le carbon dioxide e nyane. Qetellong, karabelo ea li-amine le tse ling kaofela tsa isocyanate-termination pre-polymer li etsahala, e leng ho theha khokahano ea urea.