Sababtoo ah habka wax soo saarka ee urea formaldehyde resin, horumarinta warshadaha melamine waxay la kulmeen hannaan degdeg ah.Dukumeenti cilmi-baariseed ayaa markii ugu horreysay sheegay isku-dhafka melamine ee 1933. Shirkadda America Cyanamide waxay bilowday inay soo saarto oo ay iibiso laminates budada melamine iyo dahaarka iwm 1939. 1950-yadii iyo 1960-meeyadii, Japan waxay xaqiiqsatay warshadaynta buuxda eedhismaha melamine.Sannadihii 1960-kii, Shiinuhu wuxuu bilaabay inuu soo bandhigo tignoolajiyada wax soo saarka melamine.Tobannaan sano oo horumar ah ka dib, awoodda wax-soo-saarka alaabada melamine hadda waa tan ugu sarreysa adduunka, iyada oo xisaabinaysa in ka badan 80 9/6 ee saamiga suuqa caalamiga ah.
Si aad wax badan uga ogaato budada melamine, aynu eegno habka wax soo saarka ee budada melamine marka hore.
Alaabta ugu muhiimsan ee alaabta melamine waa melamine molding compound, oo sidoo kale loo yaqaan melamine formaldehyde resin budada ama budada melamine.Maaddada ugu muhiimsan ee budada melamine waa melamine resin oo leh falcelin sare iyo iskutallaabta.Xabagta melamine-ku waa polymer-dandelion-sare oo lagu farsameeyay fal-celinta kiimikaad ee melamine iyo xalalka formaldehyde ee aqueous iyadoo la raacayo shuruudo adag.Dareen-celinta waxaa badanaa lagu sameeyaa reactor ku qalabaysan unug kicin, kuleyl iyo kicin, guud ahaan laba tallaabo.
1. Talaabada ugu horeysa waa falcelinta dheeriga ah.Marka hore, ku dar 37% xal formaldehyde aqueous weelka falcelinta oo hagaaji pH ilaa 7-9 si aad u hesho dhexdhexaad dhexdhexaad ah ama daciif ah.Kadibna ku dar qadar ku haboon oo melamine ah si aad u sameyso moore formaldehyde iyo melamine inta u dhaxaysa 2 iyo 3. Heerkulka reactor ayaa la hagaajiyay si uu si tartiib ah u kululeeyo 60-85 ° C. Waqtigaan, formaldehyde iyo melamine waxaa xannibay falcelinta methylolation , iyo oligomer melamine toosan oo ka kooban 1 ilaa 6 kooxaha methylol ayaa la sameeyay.Dareen-celinta sare waa fal-celin exothermic ah oo aan jiri karin.Markasta oo ay sareeyso saamiga formaldehyde, way fududahay in la sameeyo melamine polymethylol.
2. Talaabada labaad waa falcelinta uumiga.Marka la eego xaaladaha heerkulka sare, methylol melamine-ka aadka u firfircooni waa la sii daayay ama polycondensed si uu u soo saaro xayndaab toosan oo toosan oo ka kooban curaarta methylene ama curaarta ether dimethylene.iyadoo la adeegsanayo intramolecular ama molecular oo ah jawi dhexdhexaad ah oo acidic ah.Marka qadarka kooxda methylol yar yahay, curaarta methylene guud ahaan waa mid sareysa;resin-ku-saleysan hadhuudh, guud ahaan curaarta ether-ka dimethylene ayaa la sameeyay, curaarta methylene ayaa la sameeyay.Inta badan heerka uumiga ee falcelinta polycondensation, hoos u milmi biyaha ee melamine formaldehyde resin xal iyo weynaan viscosity.
Habka falcelinta ee kor ku xusan, miisaanka kelli ee alaabta kama dambaysta ah waxaa lagu go'aamiyaa xaaladaha falcelinta gaarka ah, iyo milanka biyaha ee alaabta sidoo kale si weyn ayaa loo beddelay.Foomamka badeecada ayaa si weyn looga heli karaa xalalka resin ilaa adkaha liidata ee milmi kara iyo kuwa aan la milmi karin iyo kuwa adag.Xalka xabagta ayaa leh xasillooni liidata mana aha mid ku habboon ilaalinta.Wax soo saarka dhabta ah, waxaa badanaa loo isticmaalaa sida substrate iyo sidoo kale walxaha aan dabiiciga ahayn sida d-cellulose, saxarka alwaax, silica, midabada ayaa lagu daraa.Waxa laga sameeyaa budo adag oo ah waxa loogu yeero budada melamine ee lagu buufiyo qalabka wax lagu qalajiyo.
Huafu Chemicals waa warshad soo saartabudada resin melamine.Haddii aad xiisaynayso, fadlan nala soo xidhiidhEmail : melamine@hfm-melamine.com
Waqtiga post: Seb-20-2019