Ka lebaka la ts'ebetso ea tlhahiso ea urea formaldehyde resin, nts'etsopele ea indasteri ea melamine e bile le ts'ebetso e potlakileng haholo.Tokomane ea lipatlisiso e ile ea tlaleha ka lekhetlo la pele ho qaptjoa ha melamine resin ka 1933. America Cyanamide Company e ile ea qala ho hlahisa le ho rekisa melamine powder laminates le coatings joalo-joalo ka 1939. Lilemong tsa bo-1950 le bo-1960, Japane e ile ea hlokomela indasteri e feletseng.motsoako oa melamine.Lilemong tsa bo-1960, Chaena e ile ea qala ho hlahisa theknoloji ea tlhahiso ea melamine.Ka mor'a lilemo tse mashome tsa tsoelo-pele, bokhoni ba tlhahiso ea lihlahisoa tsa melamine joale bo phahame ka ho fetisisa lefatšeng, bo ikarabellang ho feta 80 9/6 ea karolo ea 'maraka ea lefatše.
E le hore u tsebe ho eketsehileng ka phofo ea melamine, a re ke re shebeng mokhoa oa ho hlahisa melamine phofo pele.
Lihlahisoa tse ka sehloohong tsa lihlahisoa tsa melamine ke motsoako oa melamine, o tsejoang hape e le melamine formaldehyde resin powder kapa melamine powder.Ntho e ka sehloohong e tala ea phofo ea melamine ke resin ea melamine e nang le reactivity e phahameng le crosslinkability.Resin ea melamine ke polymer e phahameng ea dandelion e entsoeng ke karabelo ea lik'hemik'hale ea melamine le tharollo ea metsi a formaldehyde tlas'a maemo a thata.Karabelo e atisa ho etsoa ka mochine o motlakase o nang le mochine o futhumatsang, o futhumatsang le o fokolang, hangata ka mehato e 'meli.
1. Mohato oa pele ke karabelo ea tlatsetso.Ntlha ea pele, eketsa tharollo ea 37% ea metsi a formaldehyde sekepeng sa karabelo 'me u fetole pH ho 7-9 ho fumana mokhoa o sa nke lehlakore kapa o fokolang oa alkaline.Ebe u eketsa palo e loketseng ea melamine ho etsa moore formaldehyde le melamine pakeng tsa 2 le 3. Mocheso oa mochine o ile oa fetoloa e le hore butle-butle o futhumale ho 60-85 ° C. Ka nako ena, formaldehyde le melamine li ne li thibetsoe ke methylolation reaction. , 'me melamine oligomer e nang le melamine e nang le 1 ho lihlopha tsa 6 tsa methylol e ile ea thehoa.Maikutlo a ka holimo ke karabelo e sa bonahaleng ea exothermic.Ha karolo ea formaldehyde e phahame, ho ba bonolo ho etsa polymethylol melamine.
2. Mohato oa bobeli ke karabelo ea condensation.Tlas'a maemo a mocheso o phahameng, methylol melamine e sebetsang ka matla e tsoela pele etherified kapa polycondensed ho hlahisa motsoako oa crosslinked linear resin o nang le bond ea methylene kapa dimethylene ether bond.ka mekhoa ea intramolecular kapa molecular tikolohong ea asiti e mahareng.Ha palo ea sehlopha sa methylol e nyenyane, tlamahano ea methylene hangata e laola;ka resin e thehiloeng ka mabele, ka kakaretso tlamo ea dimethylene ether e thehoa, 'me tlamahano ea methylene e thehoa.Ha tekanyo ea condensation ea karabelo ea polycondensation e kholoanyane, e theola ho qhibiliha ha metsi ha motsoako oa melamine formaldehyde resin le viscosity e kholoanyane.
Ts'ebetsong e ka holimo ea karabelo, boima ba molek'hule ea sehlahisoa sa ho qetela bo khethoa ke maemo a itseng a karabelo, 'me ho qhibiliha ha metsi ha sehlahisoa le hona ho fetoloa haholo.Mefuta ea lihlahisoa e fumaneha hohle ho tloha ho litharollo tsa resin ho isa ho tse sa qhibiliheng hantle le tse sa qhibiliheng le tse sa tsitsang.Tharollo ea resin e na le botsitso bo fokolang 'me ha e khone ho boloka.Tlhahisong ea 'nete, hangata e sebelisoa e le substrate le lisebelisoa tsa inorganic tse kang d-cellulose, makhasi a lehong, silika, li-colorants li eketsoa.E entsoe ka phofo e tiileng eo ho thoeng ke phofo ea melamine ka leloala le omisang bolo.
Huafu Chemicals ke feme e joalo e hlahisangmelamine resin phofo.Haeba u thahasella, ka kopo ikopanye le ronaEmail : melamine@hfm-melamine.com
Nako ea poso: Sep-20-2019