Kusiyana pakati pa Wochotsa Mpweya ndi Wochotsa Mpweya mu Powder Coating

Chotsukira mpweya ndi chothandizira chomwe chimatulutsa zinthu zosasunthika monga mpweya, chinyezi, ndi mamolekyu ang'onoang'ono omwe amapangidwa panthawi yolumikizana ndi kulimba kwa zophimba ufa zikasungunuka ndikupanga filimu. Chimathandizanso mabowo a mamolekyu ang'onoang'ono omwe amatulutsidwa munthawi yake, kupewa kupezeka kwa mabowo ang'onoang'ono kapena pores mu filimu yophimba. Mtundu uwu wa chowonjezera ndi chimodzi mwa zowonjezera zomwe zimapezeka mu zophimba ufa, ndipo nthawi zambiri zimawonjezeredwa ku zophimba ufa.

Chomwe chimagwiritsidwa ntchito kwambiri pochotsa gasi mu ufa ndi benzoin. Benzoin ndi kristalo yoyera kapena yachikasu yopepuka yopanda fungo yokhala ndi kutentha kwa 133-137 ℃ ndi kutentha kwa 344 ℃. Imasungunuka pang'ono m'madzi ndi ether, ndipo imasungunuka mu acetone yotentha ndi ethanol; Vuto lake ndilakuti imatha kuyambitsa chikasu cha utoto kutentha kwambiri. Pofuna kuthana ndi zovuta za benzoin,mankhwala ochotsa mpweya pogwiritsa ntchito benzoin ndi serazomwe sizitha kuoneka zachikasu chifukwa cha kuphika ndi kuuma kwa zomera zapangidwa.

Zotsatira za zoyeserera ndi machitidwe opanga zikusonyeza kuti panthawi yolumikiza ndi kuchiritsa zophimba ufa, mitundu yophimba yomwe imapanga mamolekyu ang'onoang'ono imafuna kuwonjezera zophimba mpweya. Ndikoyenera kuwonjezera chophimba mpweya mu zophimba za ufa za epoxy, epoxy polyester, polyester, ndi polyurethane chifukwa zophimba ufa zimakhala ndi mavuto monga kuyamwa mosavuta chinyezi panthawi yopanga ndi kugwiritsa ntchito. Mu zophimba za ufa za epoxy matte ndi matte, sizophweka kupanga mabowo ndi zolakwika zina popanda kuwonjezera zophimba mpweya monga benzoin. Chifukwa chake sichingathe kufotokozedwa bwino pakadali pano, ndipo chikhoza kukhala chifukwa chakuti pamwamba pa zophimba sipamakhala zosalala komanso zonyezimira ngati kuwala kwambiri, komanso zolakwika zina zophimba sizikuonekera, zomwe zimapangitsa kuti munthu amve ngati akumva.

Pakadali pano, benzoin ikadali chinthu chogwiritsidwa ntchito kwambiri chochotsa mpweya, chokhala ndi mlingo wa pafupifupi 0.5% ya zinthu zonse zopangira filimu mu zophimba za ufa, zomwe zitha kusinthidwa moyenera mkati mwa mtundu wina malinga ndi mitundu ndi kapangidwe ka zophimba za ufa. Mu zophimba za ufa za polyester-HAA (hydroxyalkylamide), poganizira momwe benzoin imakhudzira chikasu cha filimu yophimba, mlingo wake uyenera kulamulidwa pafupifupi 0.3% ya kuchuluka kwa zinthu zonse zopangira filimu, ndipo kugwiritsa ntchito kuyenera kuchepetsedwa momwe kungathekere.Kuphatikiza apo, zinthu zosungunula ndi kuchotsa mpweya pogwiritsa ntchito sera zopangidwa zingagwiritsidwenso ntchito, ndi mlingo wa pafupifupi 1% ya fomula yonse yophimba ufa.

Mu mapangidwe a ufa, ma defoamers amawonjezeredwa ku chitsulo chosungunuka, aluminiyamu yosungunuka, mbale zachitsulo zosungunuka ndi madzi otentha, ndi mbale zachitsulo zozunguliridwa ndi moto zokhala ndi mabowo amchenga kapena mabowo ang'onoang'ono pamwamba pa chinthu chophimbidwa (ntchito) panthawi yophimbidwa ndi ufa kuti apewe kupangika kwa tinthu tating'onoting'ono kapena mabowo amoto mu filimu yophikira. Ndi zowonjezera zomwe zimawonjezeredwa kuti apewe kupangika kwa thovu mu filimu yophikira.

Pamene utoto wa ufa umagwiritsidwa ntchito pa zitsulo zoponyedwa, zitsulo zoponyedwa za aluminiyamu, zitsulo zoponyedwa ndi madzi otentha kapena mbale zachitsulo zozungulira ndi mabowo a mchenga kapena mabowo a pinhole, panthawi yophika ndi kuyeretsa, utoto wa ufa umasungunuka ndikuphwanyika pamene ukutseka mabowo a mchenga ndi mabowo a pinhole pamwamba pa chinthu chophimbidwa. Pamene kutentha kwa zinthu zophimbidwa kukukwera, mpweya m'mabowo a mchenga ndi mabowo a pinhole a zinthu zophimbidwa umakula, ndipo mphamvu yamkati imawonjezekanso mosalekeza. Pamene mphamvu yamkati ili yayikulu pang'ono kuposa mphamvu ya utoto wosungunuka, mpweya wamkati umaphulika utoto ndikupanga thovu laling'ono kuti lituluke. Chifukwa cha kulimba kwa utoto wa ufa panthawi yopanga filimu, kukhuthala kwa utoto wosungunuka kumawonjezeka nthawi zonse ndipo pamapeto pake kumakhala filimu yolimba yophikira. Chifukwa chake, pamene mphamvu yamkati m'mabowo ang'onoang'ono sifika pa mphamvu yofunikira kuti filimu yophikira iphulike, thovu laling'onoli limapanga tinthu tating'onoting'ono kapena tinthu tating'onoting'ono tomwe timatuluka pamwamba pa filimu yophikira. Pamene mphamvu yamkati mu thovu laling'ono ili yokwanira kuphulika utoto, thovu laling'ono lidzaphulika ndipo mpweya wamkati udzatuluka mumlengalenga. Ngati chophimbacho chatayika mphamvu yake yolinganiza ndipo sichingathe kulumikiza mabowo ang'onoang'ono a mpweya omwe amalola mpweya kutuluka, tinthu tating'onoting'ono ta volcano kapena tinthu tating'onoting'ono timapanga, zomwe zimapangitsa kuti vuto lalikulu likhalepo.

Ngati zotsukira mpweya ziwonjezeredwa ku zophimba ufa, zimatha kuchepetsa kukhuthala kwa utoto wa ufa ndikuchepetsanso mphamvu ya pamwamba pa utotowo. Izi zimathandiza kuti mpweya womwe uli m'mabowo amchenga ndi m'mabowo pamwamba pa zinthu zophimbidwa, zomwe zimakhudzidwa ndi kutentha ndi kupanikizika kwa kuphika, uphulike mosavuta ndikuchepetsa filimu yophimbidwa yosaphimbidwa mumlengalenga. Nthawi yomweyo, mipata yomwe ili mu filimu yophimbidwa komwe thovu limatuluka imathanso kulumikiza mosavuta kulinganiza, kuletsa kupangika kwa tinthu ndi tinthu mu filimu yophimbidwa, kapena tinthu tokhala ndi mabowo a mapiri.

Popeza njira zochotsera poizoni m'madzi ndi zosungunulira zimakhala zosiyana kwambiri ndi za zophimba ufa, zochotsera poizoni zomwe zimagwiritsidwa ntchito m'madzi ndi zosungunulira sizingagwiritsidwe ntchito mwachindunji pa zophimba ufa. Chifukwa cha mawonekedwe a zophimba ufa, palibe mitundu yambiri ya zochotsera poizoni zomwe zimagwiritsidwa ntchito m'zophimba ufa monga momwe zilili m'madzi ndi zophimba zosungunulira.