Nekuda kwekugadzirwa kweurea formaldehyde resin, kusimudzira kweindasitiri yemelamine kwakasangana nekukasira kuita.Gwaro retsvakurudzo rakatanga kurondedzera kuumbwa kwe melamine resin muna 1933. America Cyanamide Company yakatanga kugadzira nekutengesa melamine powder laminates and coatings nezvimwe muna 1939. Mumakore ekuma1950 nema1960, Japan yakaziva kuzara kwemaindasitiri.melamine molding compound.Mumakore ekuma1960, China yakatanga kuunza tekinoroji yekugadzira melamine.Mushure memakumi emakore ebudiriro, huwandu hwekugadzira kwezvigadzirwa zve melamine hwave hwepamusoro-soro pasi rose, huchiverengera kupfuura 80 9/6 yemugove wemusika wepasi rose.
Kuti tizive zvakawanda nezve melamine poda, ngatitarisei maitiro ekugadzira melamine poda kutanga.
Chinhu chikuru chezvigadzirwa zve melamine ndeye melamine molding compound, inozivikanwawo se melamine formaldehyde resin poda kana melamine poda.Iyo huru yakabikwa ye melamine poda melamine resin ine yakakwirira reactivity uye crosslinkability.Iyo melamine resin ndeyepamusoro-dandelion polymer yakagadzirwa nemakemikari reaction ye melamine uye aqueous formaldehyde mhinduro pasi pemamiriro akasimba.Mhedzisiro yacho inowanzoitwa mureactor yakashongedzerwa neinokuchidzira, kudziyisa uye condensing unit, kazhinji mumatanho maviri.
1. Danho rokutanga nderokuita kwekuwedzera.Chekutanga, wedzera 37% aqueous formaldehyde mhinduro kumudziyo wekuita uye gadzirisa pH kusvika 7-9 kuti uwane isina kwayakarerekera kana isina kusimba alkaline svikiro.Zvadaro wobva wawedzera huwandu hwakakodzera hwe melamine kuti uite moore formaldehyde uye melamine pakati pe2 ne 3. Kupisa kweiyo reactor kwakagadziriswa kuitira kuti zvishoma nezvishoma inopisa kusvika 60-85 ° C. Panguva ino, formaldehyde uye melamine zvakavharwa ne methylolation reaction. , uye mutsara melamine oligomer ine 1 kune 6 methylol mapoka akaumbwa.Mhedzisiro iri pamusoro apa ndeye isingagoneki exothermic reaction.Iyo yakakwirira chikamu che formaldehyde, zviri nyore kuita polymethylol melamine.
2. Danho rechipiri ndiro condensation reaction.Pasi pemamiriro ekupisa kwepamusoro, iyo yakanyanya reactive methylol melamine inowedzerwa etherified kana polycondensed kuti ibudise yakachinjika linear resin compound ine methylene bond kana dimethylene ether bond.ne intramolecular kana molecular zvinoreva munzvimbo ine acidic medium.Kana huwandu hweboka remethylol diki, chisungo chemethylene chinowanzo tungamira;mune resin-based resin, dimethylene ether bond inowanzoumbwa, uye methylene bond inoumbwa.Iyo yakakura dhigirii yekunyungudika kwepolycondensation reaction, inodzikisira kunyungudika kwemvura kwemelamine formaldehyde resin solution uye kuwedzera viscosity.
Mukuita maitiro ari pamusoro, huremu hwemamorekuru echigadzirwa chekupedzisira hunotarwa nemamiriro ekuita chaiwo, uye kunyungudika kwemvura kwechigadzirwa kunoshandurwawo zvakanyanya.Mafomu echigadzirwa anowanikwa zvakanyanya kubva kune resin mhinduro kune isina kunyungudika uye isinganyungudika uye infusible solids.Mushonga we resin une kugadzikana kwakashata uye haubatsiri kuchengetedza.Mukugadzirwa chaiko, inowanzoshandiswa se substrate uye zvakare inorganic zvinhu senge d-cellulose, huni pulp, silica, colorants inowedzerwa.Inogadzirwa kuita hupfu hwakasimba hunova hunonzi melamine hupfu nespray drying ball mill.
Huafu Chemicals yakadaro fekitori inogadziramelamine resin poda.Kana iwe uchida, tapota taura nesuEmail : melamine@hfm-melamine.com
Nguva yekutumira: Sep-20-2019