Madzi a Waterborne (WB) UV chemistry yawonetsa kukula kwakukulu m'misika yamitengo yamkati yamafakitale chifukwa ukadaulo umapereka magwiridwe antchito abwino kwambiri, kutulutsa kotulutsa zosungunulira kocheperako komanso kuchuluka kwa kupanga. Makina okutira a UV amapatsa wogwiritsa ntchito mapindu achitetezo apamwamba kwambiri amankhwala komanso kukana kukanda, kukana bwino kwa block, ma VOC otsika kwambiri ndi zida zazing'ono zokhala ndi malo osungira ochepa ofunikira. Makinawa ali ndi zinthu zomwe zimafananiza bwino ndi zigawo ziwiri za urethane popanda zovuta za ma crosslinkers owopsa komanso nkhawa za moyo wa mphika. Dongosolo lonseli ndi lokwera mtengo chifukwa chakuchulukirachulukira kopanga komanso kutsika kwamitengo yamagetsi. Ubwino womwewu ukhoza kukhala wopindulitsa pa ntchito zakunja zomwe zimagwiritsidwa ntchito ndi fakitale kuphatikiza mafelemu a zenera ndi zitseko, siding ndi mphero zina. Magawo amsika awa nthawi zambiri amagwiritsa ntchito ma emulsion a acrylic ndi ma polyurethane dispersions chifukwa ali ndi gloss yabwino komanso kusungirako mitundu, ndikuwonetsa kulimba kwambiri. Mu kafukufukuyu, ma resins a polyurethane-acrylic okhala ndi magwiridwe antchito a UV adawunikidwa molingana ndi zomwe makampani amapangira mkati ndi kunja kwa matabwa.
Mitundu itatu ya zokutira zosungunulira zimagwiritsidwa ntchito kwambiri popanga matabwa amakampani. Nitrocellulose lacquer nthawi zambiri imakhala yosakanikirana ndi nitrocellulose ndi mafuta kapena ma alkyds opangidwa ndi mafuta. Zovala izi zimawumitsa mwachangu komanso zimakhala ndi gloss yayikulu. Amagwiritsidwa ntchito makamaka m'nyumba zopangira mipando. Ali ndi vuto la chikasu pakapita nthawi ndipo amatha kukhala osalimba. Amakhalanso ndi vuto losakanizidwa ndi mankhwala. Ma lacquers a nitrocellulose ali ndi ma VOC apamwamba kwambiri, nthawi zambiri amakhala 500 g/L kapena kupitilira apo. Ma lacquers opangidwa kale ndi osakaniza a nitrocellulose, mafuta kapena mafuta a alkyds, plasticizers ndi urea-formaldehyde. Amagwiritsa ntchito chothandizira chofooka cha asidi monga butyl acid phosphate. Zopaka izi zimakhala ndi alumali moyo wa miyezi inayi. Amagwiritsidwa ntchito muofesi, mipando yanyumba ndi nyumba. Ma lacquers opangidwa kale amakhala ndi zotsutsana bwino ndi mankhwala kuposa ma lacquers a nitrocellulose. Amakhalanso ndi ma VOC apamwamba kwambiri. Ma varnish otembenuka ndi osakanikirana a alkyds opangidwa ndi mafuta, urea formaldehyde ndi melamine. Amagwiritsa ntchito chothandizira champhamvu cha asidi monga p-toluene sulfonic acid. Amakhala ndi moyo wa mphika wa maola 24 mpaka 48. Amagwiritsidwa ntchito mu kabati ya khitchini, mipando yaofesi ndi mipando yanyumba. Ma vanishi otembenuza amakhala ndi zinthu zabwino kwambiri zamitundu itatu ya zokutira zosungunulira zomwe zimagwiritsidwa ntchito pamitengo yamakampani. Ali ndi ma VOC okwera kwambiri komanso mpweya wa formaldehyde.
Madzi-based self-crosslinking acrylic emulsions ndi polyurethane dispersions akhoza kukhala njira zabwino zopangira zosungunulira zopangira matabwa a mafakitale. Ma emulsion a Acrylic amapereka mankhwala abwino kwambiri komanso kutsekereza kukana, kulimba kwapamwamba, kulimba kwapadera komanso kusinthasintha kwanyengo, komanso kumamatira bwino kumalo omwe sianthu. Amakhala ndi nthawi yowuma mwachangu, zomwe zimapangitsa nduna, mipando kapena wopanga zinthu zomangira kuti azigwira zigawozo atangomaliza kugwiritsa ntchito. Ma PUDs amapereka kukana kwabwino kwa abrasion, kusinthasintha, komanso kukanda komanso kukana. Ndiabwenzi abwino ophatikizana ndi ma emulsions a acrylic kuti apititse patsogolo makina. Ma emulsion a acrylic ndi ma PUD amatha kuchitapo kanthu ndi ma chemistry ophatikizika monga polyisocyanates, polyaziridine kapena carbodiimides kupanga zokutira za 2K zokhala ndi zinthu zabwino.
Zovala zokhala ndi madzi zochizika ndi UV zakhala zosankha zodziwika bwino pamafakitale amatabwa. Makabati a khitchini ndi opanga mipando amasankha zokutira izi chifukwa ali ndi mphamvu zotsutsa komanso zamakina, zida zabwino kwambiri zogwiritsira ntchito komanso mpweya wochepa kwambiri wa zosungunulira. Zovala za WB UV zimakhala ndi kukana kwabwino kwa block mukangochiritsidwa, zomwe zimalola kuti zida zokutira zisungidwe, kupakidwa ndikutumizidwa kuchokera pamzere wopangira popanda nthawi yokhazikika kuti zikulitse kuuma. Kukula kwa kuuma mu zokutira za WB UV ndizodabwitsa ndipo zimachitika mumasekondi. Kukana kwa mankhwala ndi madontho kwa zokutira za WB UV ndizopambana kuposa za ma vanishi osinthika opangidwa ndi zosungunulira.
Zovala za WB UV zili ndi zabwino zambiri zobadwa nazo. Ngakhale 100% -olimba ma oligomers a UV nthawi zambiri amakhala owoneka bwino kwambiri ndipo amayenera kuchepetsedwa ndi zosungunulira, ma WB UV PUDs amakhala otsika kwambiri, komanso kukhuthala kwake kumatha kusinthidwa ndi zosintha zachikhalidwe za WB. Ma WB UV PUDs ali ndi kulemera kwakukulu kwa mamolekyu ndipo samapanga kulemera kwa maselo chifukwa amachiritsa kwambiri monga 100% zokutira zolimba za UV. Chifukwa ali ndi kuchepa pang'ono kapena alibe pamene akuchiritsa, ma WB UV PUDs amamatira kwambiri kumagulu ambiri. Kuwala kwa zokutira izi kumayendetsedwa mosavuta ndi othandizira achikhalidwe. Ma polima awa amatha kukhala olimba kwambiri komanso osinthika kwambiri, kuwapangitsa kukhala oyenera zokutira matabwa akunja.
Nthawi yotumiza: Mar-07-2024
