Thovu la polyurethane (PU thovu) ndi chinthu chofunikira kwambiri m'mafakitale ambiri, kuphatikizapo zomangamanga, kupanga magalimoto, kulongedza, ndi kutchinjiriza. Njira yopangira thovu la PU imaphatikizapo momwe ma polyols amachitira ndi isocyanates, ndipo ma catalysts amayang'anira kuchuluka kwa momwe zinthu zimachitikira, momwe thovu limachitikira, komanso kapangidwe ka thovu.Zothandizira za polyurethanemonga MXC-37 (DMAEE) imagwira ntchito yofunika kwambiri pa ntchitozi, kukonza makhalidwe a thovu ndikuwonjezera luso lopanga. Nkhaniyi ifotokoza madera ogwiritsira ntchito thovu la PU ndikufotokozera momwe thovu limapangira, kuyang'ana kwambiri ntchito ya MXC-37.
Kugwiritsa Ntchito Foam ya Polyurethane
Thovu la polyurethane limagwiritsidwa ntchito m'njira zosiyanasiyana chifukwa cha ntchito zake zambiri, monga kutchinjiriza bwino kutentha, kuyamwa kwa shock, komanso kupepuka. Mitundu iwiri ikuluikulu ya thovu la polyurethane, thovu lolimba ndi thovu losinthasintha, imakwaniritsa zosowa zosiyanasiyana zamafakitale.
Thovu lolimba la polyurethane: Thovu lolimba la polyurethane limagwiritsidwa ntchito makamaka poteteza kutentha. Chifukwa cha mphamvu zake zabwino zotetezera kutentha, nthawi zambiri limagwiritsidwa ntchito pomanga nyumba, mafiriji, mafiriji, malo osungiramo zinthu zozizira, komanso kunyamula zinthu zomwe zimakhudzidwa ndi kutentha. Thovu lolimba nthawi zambiri limakhala ndi maselo otsekedwa, zomwe zimawathandiza kukhalabe olimba, olimba, komanso mphamvu zoteteza kutentha.
Thovu lofewa la polyurethane losinthasintha: Thovu lofewa la polyurethane losinthasintha limagwiritsidwa ntchito kwambiri popanga matiresi, ma cushion, mipando yamagalimoto, komanso kutentha kwa mapaipi ndi matanki. Limapereka chitonthozo, chithandizo, komanso kuyamwa bwino mawu, zomwe zimapangitsa kuti likhale lodziwika bwino m'mafakitale a mipando ndi magalimoto.
Mafosholo apadera: Ma thovu a polyurethane angagwiritsidwenso ntchito pazinthu zapadera, monga kupanga ma thovu ang'onoang'ono, ma elastomer, ndi zipangizo zolimba zomangira thovu. Ma thovu amenewa ali ndi makhalidwe apadera omwe amakwaniritsa zofunikira zinazake monga kulimba kwambiri, kusinthasintha, komanso kuchepetsa kulemera.
Njira Yopangira Thovu la Polyurethane
Njira yopangira thovu la polyurethane imaphatikizapo kuchitapo kanthu pakati pa ma polyol ndi ma isocyanates, mothandizidwa ndi ma catalyst, ma blowing agents, ndi stabilizers. Kuchitapo kanthu kumeneku kumapanga matrix a polymer ndi ma gas thovu, zomwe zimapangitsa kuti pakhale thovu. Njira yomwe imagwira ntchito kumbuyo kwa kapangidwe kameneka ingagawidwe m'kupanga thovu la open-cell ndi thovu la closed-cell.
1. Kupanga Thovu Lotseguka
Thovu lotseguka limapangidwa pamene thovu lomwe limapangidwa panthawi yotulutsa thovu limasweka chifukwa cha mpweya wambiri mkati mwa thovu. Pamene kupanikizika mkati mwa thovulo kukuwonjezeka, makoma a thovulo, omwe amapangidwa ndi gel reaction, nthawi zambiri amasowa mphamvu yolimbana ndi kupanikizika kwa mpweya mkati. Izi zimapangitsa kuti mpweya utuluke komanso kutulutsa mpweya kuchokera mu thovulo. Zotsatira zake, kapangidwe ka thovulo kamakhala selo lotseguka.
Kupangidwa kwa thovu lotseguka kumakhudzidwa kwambiri ndi liwiro la gelation ndi mphamvu ya makoma a polima. Chiwerengero cha maselo otseguka mu thovu chimakhudza kwambiri mawonekedwe a chinthucho. Mwachitsanzo, kuchuluka kwa maselo otseguka kumatha kuwonjezera kulowa kwa chinyezi, kuchepetsa mphamvu zotetezera kutentha, komanso kukhudza kukhazikika kwa thovu. Mu thovu lolimba kwambiri, kuchuluka kwa maselo otseguka kumakhala kochepa, nthawi zambiri pakati pa 5% ndi 10%, ndipo 90% yotsalayo mpaka 95% imakhala maselo otsekedwa.
2. Kupanga Thovu Lotsekedwa
Ma thovu otsekedwa amadziwika ndi kapangidwe ka maselo okhuthala komanso ofanana, komwe mpweya umatsekeredwa mkati mwa maselo, zomwe zimapangitsa thovu lokhazikika komanso lolimba. Liwiro la gel m'machitidwe a thovu otsekedwa nthawi zambiri limakhala lachangu, lothandizidwa ndi polyether polyols ndi polyisocyanates zomwe zimagwira ntchito zambiri, zolemera pang'ono. Machitidwe othamanga awa amatsimikizira kuti mpweya womwe uli mkati mwa thovu ulibe nthawi yotuluka thovu lisanaume, zomwe zimapangitsa kuti thovu likhale lolamulidwa ndi maselo otsekedwa.
Ma thovu a polyurethane olimba okhala ndi maselo otsekedwa amapereka chitetezo chabwino ndipo amagwiritsidwa ntchito kwambiri m'mafakitale monga zomangamanga, komwe mphamvu zotetezera kutentha ndizofunikira kwambiri. Amagwiritsidwanso ntchito posungira zinthu zozizira chifukwa amatha kusunga kutentha komanso kupewa kulowa kwa chinyezi.
Udindo waMXC-37 (DMAEE)mu Kupanga Thovu la Polyurethane
MXC-37, yomwe imadziwikanso kuti DMAEE (Dimethylaminoethoxyethanol), ndi chothandizira cha amine chopanda utsi, chomwe sichimanunkha kwambiri chomwe chimagwiritsidwa ntchito kwambiri popanga thovu la polyurethane. Mphamvu yake yotulutsa thovu kwambiri imapangitsa kuti ikhale yoyenera kwambiri popanga thovu la polyurethane (SPF) lokhala ndi madzi ambiri, monga thovu la polyurethane lokhala ndi porous spray (SPF) lochepa.
MXC-37 imagwira ntchito ngati chothandizira chomwe chimafulumizitsa isocyanate-polyol reaction, zomwe zimapangitsa kuti thovu lipangidwe. Chimodzi mwa ubwino waukulu wa MXC-37 ndi kuthekera kwake kuchepetsa kapena kuchotsa fungo la amine lomwe nthawi zambiri limagwirizanitsidwa ndi kupanga thovu la polyurethane. Izi zimapangitsa kuti likhale labwino kwambiri pakugwiritsa ntchito komwe fungo loletsa kununkhira ndilofunika, monga poteteza kutentha m'nyumba ndi m'mabizinesi.
Kuwonjezera pa ntchito yake ngati chothandizira chachikulu, MXC-37 ingagwiritsidwenso ntchito ngati chothandizira pamodzi ndi zinthu zina zoyambitsa ma amine, monga BDMAEE, kuti iwonjezere mphamvu ya zomwe zimachitika. Mwa kuchepetsa kugwiritsa ntchito ma amine amphamvu, MXC-37 imathandiza kuchepetsa mpweya woipa, zomwe zimapangitsa kuti ikhale njira yabwino yopangira thovu la polyurethane.
MXC-37 imagwiritsidwa ntchito m'njira zosiyanasiyana zopangira thovu, kuphatikizapo:
- Ma thovu ofewa okhazikika okhala ndi Ester: Zogwiritsidwa ntchito zomwe zimafuna thovu lofewa komanso losinthasintha.
- Thovu la microcellular: Kuti muwongolere bwino kapangidwe ka thovu.
- Elastomer ndi RIM: Pakupanga zinthu zofewa zosinthasintha komanso zolimba.
- Kupaka thovu lolimba: Pa ntchito zomwe zimafuna mphamvu zambiri zamakanika komanso kutentha kwambiri.
Mapeto
Thovu la polyurethane ndi chinthu chogwiritsidwa ntchito kwambiri komanso chogwiritsidwa ntchito kwambiri chomwe chimagwiritsidwa ntchito m'mafakitale ambiri chifukwa cha kutenthetsa kwake bwino, kuvindikira kwa kugwedezeka komanso zinthu zomwe zingasinthidwe. Ma catalyst monga MXC-37 amachita gawo lofunikira popanga thovu la polyurethane chifukwa amathandizira kuwongolera njira yotulutsira thovu, kukonza magwiridwe antchito azinthu ndikuchepetsa fungo losayenera komanso kutulutsa mpweya woipa. Kumvetsetsa njira zomwe zimapangitsa kuti thovu lipangidwe, kaya lotseguka kapena lotsekedwa, kumathandiza opanga kusintha zinthu kuti zigwirizane ndi zosowa zawo, kuyambira pazida zotulutsira kutentha mpaka thovu lapadera la mafakitale osiyanasiyana.
Nthawi yotumizira: Feb-24-2025