Chitoliro chokwiriridwa mwachindunji chokwiriridwacho chimakhala ndi thovu chifukwa chamankhwala amtundu wapamwamba wa polyether polyol composite komanso polymethyl polyphenyl polyisocyanate ngati zopangira. Mwachindunji m'manda matenthedwe kutchinjiriza mapaipi ntchito kutchinjiriza matenthedwe ndi ozizira kutchinjiriza ntchito zosiyanasiyana m'nyumba ndi panja mapaipi, chapakati Kutentha mapaipi, chapakati mpweya mipope, mankhwala, mankhwala ndi mapaipi ena mafakitale. Chiyambireni kubadwa kwa zida za polyurethane m'zaka za m'ma 1930, chitoliro chotchinjiriza thovu cha polyurethane chapangidwa mwachangu ngati chida chabwino kwambiri chotchinjirizira matenthedwe, ndipo mawonekedwe ake akuchulukirachulukira. Amagwiritsidwa ntchito kwambiri pamapaipi osiyanasiyana monga kutenthetsa, kuziziritsa, mayendedwe amafuta, komanso mayendedwe a nthunzi.

Mavuto Common ndi njira yomanga mwachindunji m'manda matenthedwe kutchinjiriza mapaipi

Izi nthawi zambiri zimachitika m'dzinja ndi m'nyengo yozizira kapena m'mawa, chifukwa kutentha kumatsika mwadzidzidzi kapena kutentha kumakhala kochepa. Itha kuthetsedwa powonjezera kutentha kozungulira komanso kutentha kwa zinthu zakuda. Nthawi zambiri, kutentha kwa zinthu zakuda kumakwera mpaka 30-60 ° C, ndipo kutentha kwapakati kumakwera mpaka 20-30 ° C.

Izi nthawi zambiri zimachitika m'chilimwe ndi m'chilimwe kapena nthawi yomanga masana, chifukwa kutentha kumakwera mwadzidzidzi komanso kutentha kwambiri. Zinthu zakuda zimatha kuziziritsidwa ndi madzi ozizira kapena kuziyika panja usiku kuti ziziziziritsa zachilengedwe kuti zipewe kuwala kwa dzuwa.

Mphamvu ya thovu ya chitoliro chokwiriridwa mwachindunji ndi yaying'ono ndipo chithovu chimakhala chofewa. Chodabwitsa ichi chimayamba chifukwa cha kusalinganika kwa chiŵerengero cha zipangizo zakuda ndi zoyera. Gawo la zinthu zakuda likhoza kuwonjezeka moyenerera (1: 1-1.05). Samalani kuti musapangitse kuchuluka kwa zinthu zakuda kukhala zazikulu kwambiri, mwinamwake, zidzayambitsa Chithovucho chimakhala chosasunthika, chomwe chimakhudzanso ntchito ya thovu.

Direct m'manda kutchinjiriza chitoliro wakhala ndi okhwima patsogolo luso m'mayiko otukuka kunja. M'zaka khumi zapitazi, dziko langa Kutentha zomangamanga ndi ogwira ntchito luso akulimbikitsa chitukuko cha zoweta chitoliro maukonde atagona luso pa mlingo wapamwamba ndi digesting ndi kuyamwa luso patsogolo. Zotsatira zabwino pazaka khumi zapitazi zatsimikizira kuti njira yoyakira poyikira mwachindunji mapaipi otsekera matenthedwe ali ndi zabwino zambiri poyerekeza ndi ngalande zakale ndi kuyala pamwamba. Chitoliro chosungunula chotenthetsera chokwiriridwa mwachindunji chimaphatikizidwa bwino ndi chitoliro chachitsulo chotumizira sing'anga, chotchinga chakunja cha polyethylene chotalikirapo, ndi wosanjikiza wokhazikika wa thovu la polyurethane pakati pa chitoliro chachitsulo ndi chosungira chakunja. Ichinso ndi mphamvu ya mkati yoyendetsera chitukuko chachangu cha polyurethane matenthedwe kutchinjiriza mwachindunji kukwiriridwa mipope mu Kutentha injiniya dziko langa.