Ma muli o ke kaʻina hana o ka resin formaldehyde urea, ua ʻike ka hoʻomohala ʻana o ka ʻoihana melamine i kahi kaʻina wikiwiki.Ua hōʻike mua ka palapala noiʻi i ka synthesis o ka melamine resin ma 1933. Ua hoʻomaka ʻo America Cyanamide Company e hana a kūʻai aku i ka melamine pauka laminates a me nā uhi a me nā mea ʻē aʻe i ka makahiki 1939.melamine molding compound.I ka makahiki 1960, ua hoʻomaka ʻo Kina e hoʻolauna i ka ʻenehana hana melamine.Ma hope o nā makahiki he nui o ka hoʻomohala ʻana, ʻoi aku ka kiʻekiʻe o ka hana o nā huahana melamine ma ka honua, ʻoi aku ka nui ma mua o 80 9/6 o ka māhele mākeke honua.
No ka ʻike hou aku e pili ana i ka pauka melamine, e nānā mua kākou i ke kaʻina hana o ka pauka melamine.
ʻO ka mea kumu nui o nā huahana melamine he melamine molding compound, i ʻike ʻia ʻo melamine formaldehyde resin powder a i ʻole ka pauka melamine.ʻO ka mea nui o ka pauka melamine he melamine resin me ka reactivity kiʻekiʻe a me ka crosslinkability.ʻO ka melamine resin he polymer dandelion kiʻekiʻe i hoʻohui ʻia e ka hopena kemika o ka melamine a me ka wai formaldehyde solution ma lalo o nā kūlana koʻikoʻi.Hana ʻia ka hopena i loko o kahi reactor i hoʻolako ʻia me kahi hui hoʻoulu, hoʻomehana a condensing, maʻamau ma nā ʻanuʻu ʻelua.
1. ʻO ka hana mua ka pane hoʻohui.ʻO ka mea mua, e hoʻohui i 37% wai wai formaldehyde solution i ka moku pane a hoʻoponopono i ka pH i 7-9 no ka loaʻa ʻana o kahi mea kūʻokoʻa a nāwaliwali ʻole.A laila e hoʻohui i ka nui kūpono o ka melamine e hana i ka moore formaldehyde a me ka melamine ma waena o 2 a me 3. Ua hoʻoponopono ʻia ka mahana o ka reactor i wela mālie i 60-85 ° C. I kēia manawa, ua ālai ʻia ka formaldehyde a me ka melamine e ka hopena methylolation. , a ua hoʻokumu ʻia kahi oligomer melamine linear i loaʻa ka 1 a 6 mau pūʻulu methylol.ʻO ka hopena i luna he hopena exothermic hiki ʻole ke loaʻa.ʻOi aku ka kiʻekiʻe o ka formaldehyde, ʻoi aku ka maʻalahi o ka hana ʻana i ka polymethylol melamine.
2. ʻO ka hana ʻelua ka hopena condensation.Ma lalo o nā kūlana wela kiʻekiʻe, ua hoʻohui hou ʻia ka methylol melamine reactive a i ʻole polycondensed e hana i kahi hui resin laina crosslinked i loaʻa kahi paʻa methylene a i ʻole kahi paʻa dimethylene ether.ma ke ʻano intramolecular a i ʻole molecular i loko o kahi kaiapuni ʻawaʻawa.Ke liʻiliʻi ka nui o ka pūʻulu methylol, ʻoi aku ka nui o ka paʻa methylene;i loko o ka resin sorghum-based, hoʻokumu ʻia kahi paʻa dimethylene ether, a hoʻokumu ʻia kahi paʻa methylene.ʻOi aku ka nui o ka condensation o ka hopena polycondensation, ʻoi aku ka haʻahaʻa o ka hoʻoheheʻe wai o ka melamine formaldehyde resin solution a ʻoi aku ka nui o ka viscosity.
Ma ke kaʻina hana i luna, ua hoʻoholo ʻia ke kaumaha molekala o ka huahana hope e nā kūlana hoʻohālikelike kikoʻī, a ua hoʻololi nui ʻia ka wai solubility o ka huahana.Loaʻa nui ʻia nā ʻano huahana mai nā mea hoʻonā resin a hiki i nā mea paʻa hiki ʻole ke hoʻoheheʻe ʻia a me ka insoluble.ʻAʻole paʻa maikaʻi ka hopena resin a ʻaʻole kūpono i ka mālama ʻana.I ka hana maoli, hoʻohana pinepine ʻia ia ma ke ʻano he substrate a me nā mea inorganic e like me d-cellulose, pulp lāʻau, silica, hoʻohui ʻia nā kala.Hana ʻia ʻo ia i mea paʻa paʻa i kapa ʻia he pauda melamine e kahi wili pōlele hoʻomaloʻo.
He hale hana ʻo Huafu Chemicalmelamine resin pauka.Inā makemake ʻoe, e ʻoluʻolu e kelepona mai iā mākouEmail : melamine@hfm-melamine.com
Ka manawa hoʻouna: Sep-20-2019