I-modified melamine formaldehyde resin iyi-polymer etholakala ngokusabela kwe-melamine ne-formaldehyde, eyaziwa nangokuthi i-melamine formaldehyde resin noma i-melamine resin.
Izakhiwo Ezibonakalayo: I- resin ye-melamine formaldehyde elungisiwe ayinambala futhi iyabonakala, izinzile emanzini abilayo, futhi ingasetshenziswa ngisho naku-150°C. Inezakhiwo ezizicishayo, izakhiwo ze-arc, kanye nezakhiwo ezinhle zemishini.
Izakhiwo zamakhemikhali: Izinto zokusetshenziswa ziyi-melamine kanye ne-37% ye-formaldehyde aqueous solution. Isilinganiso se-molar ye-formaldehyde ne-melamine si-2 ~ 3. Izinombolo ezihlukene zama-substituent ze-N-hydroxymethyl zenziwa ngesinyathelo esisodwa, bese ziphinde zifinyezwe zibe ama-resin alayini. Izimo zokusabela zihlukile, futhi isisindo samangqamuzana womkhiqizo sihlukile. Ingasukela ekuncibilikeni emanzini iye kokucishe ingancibiliki emanzini, noma iqine futhi ingancibiliki. Inani le-pH linethonya elikhulu kuzinga lokusabela. Isixazululo se-resin esilungiselelwe ngenhla akulula ukusigcina, futhi ukomiswa kwesifutho kuvame ukusetshenziswa embonini ukukhiqiza okuqinile okuyimpuphu. I-melamine resin ayelapheki ekamelweni lokushisa. Ngokuvamile yelapheka ngokushisa okuphakathi kuka-130-150°C. Ukwengeza inani elincane le-asidi ukugqugquzela izinga lokuphulukisa kungakhuphula izinga lokuphulukisa.
Ukusebenza embonini yesikhumba: Embonini yesikhumba, i-melamine resin isetshenziswa kakhulu ngaphambi kokushuka, ukushuka kabusha, kanye nokugcwalisa inhlaka, phakathi kwayo i-trimethyl melamine resin iyinhlaka ye-amino esetshenziswa kakhulu. I-amino resin inomshini wokushuka njenge-aldehyde tanning: i-prepolymer ingena esikhunjeni, futhi njengoba inani le-pH lehla, i-prepolymer ijiya ngokuzenzakalelayo ibe ama-molecule anosayizi othile esikhumbeni. Ngokufingqa kwe--NHCH2OH esebenzayo ku-molecule enamaqembu e-amino eketangeni le-collagen peptide, kwakheka uhlelo lokuxhumanisa okuhlangene ukuze kuzuzwe injongo yama-tannins.
Ngenxa yokusebenza kabusha okuphezulu kwe-methylal, ama-molecule e-trimethyl melamine athambekele ekuphenduleni kwe-polycondensation, akhiqize ama-molecule angaxhumene ne-cross-link futhi alahlekelwe ukushuka. Njengamanje, izindlela ezisetshenziswa kakhulu futhi ezisobala ukuvimbela ngokufanelekile iqembu le-hydroxymethyl ukunciphisa umsebenzi walo, ukuvimbela ukufiphala okuqhubekayo phakathi kwama-molecule, noma ukwethula amaqembu e-hydrophilic esakhiweni samangqamuzana ukwandisa ukuncibilika kwamanzi.
Njengamanje, ama-melamine resin tanning agents alungiswa kakhulu ekhaya naphesheya ngokujiya i-melamine, i-dicyandiamide iyodwa noma exutshwe ne-formaldehyde, futhi ashintshwa ngokufanele njengoba kudingeka.
Izicelo embonini yamaphepha:
Ngenxa yokuthi i-melamine formaldehyde resin iqukethe amaqembu e-hydroxymethyl, ingakha ukwakheka kwe-etherified phakathi kwama-fiber bundles. Lokhu kuxhumanisa phakathi kwama-molecule ahlukene kukhiqiza amanzi, okwenza iphepha libe nomswakama. Ngakho-ke, isetshenziswa kakhulu njenge-ejenti yokuqinisa emanzi kanye ne-ejenti yamanzi embonini yamaphepha.
I-anionic modified melamine formaldehyde resin
Ngokuyinhloko i-sulfonated melamine resin. Uma kuqhathaniswa, i-sulfamate-modified resin ingcono futhi isetshenziswa kabanzi. Lolu hlobo lomkhiqizo lungelapheka ngaphansi kwezimo ezine-asidi, ezingathathi hlangothi, noma ezine-alkaline, futhi lungangezwa ku-slurry noma lusetshenziswe ekuhlanganiseni. Inkinga ukuthi lapho isilungisi siphendula nge-formaldehyde, imvula kanye nekristalu kwenzeka, futhi kunzima ukukuhlunga.
I-resin ye-melamine formaldehyde eguquliwe ye-cationic
I-melamine resin elungiswe ngama-reagents e-cationic njenge-triethanolamine, i-dimethylamine, njll. inogesi omuhle, ingamuncwa ngokushesha imicu, futhi ingelapheka ngenani eliphakeme le-pH. Igwema imiphumela emibi ye-melamine-formaldehyde resin evamile emhlophe nokuqina kwephepha. Njengamanje, ucwaningo oluyinhloko kulo mkhakha ekhaya nakwamanye amazwe ukusebenzisa utshwala obuncane be-molecular, njenge-methanol, i-butanol, njll., njengama-etherifying agents kanye nenani elincane le-cationic modifiers ngaphansi kwe-catalysis ye-p-toluene sulfonic acid ukuze uvimbele amaqembu abo asebenzayo futhi uthuthukise ukuzinza komkhiqizo. .
Izindlela eziyinhloko zokunciphisa okuqukethwe kwe-formaldehyde yamahhala yilezi: ukusebenzisa izinto eziphilayo ezinamandla oxidizing, njenge-formic acid ne-hydrogen peroxide, engakwazi ukukhipha i-formaldehyde ibe yi-CO2 namanzi. Phakathi nenqubo yokulungiselela i-resin, i-formaldehyde neutralizers efana ne-borax, i-propylene glycol, ne-sodium bisulfite yengezwa, futhi i-vacuum distillation isetshenziswa.
Izicelo embonini enamathelayo
I-Melamine formaldehyde resin eguquliwe ngokufaka i-etherification yezinto ezinotshwala obuphansi (njenge-methanol, i-butanol, i-isobutane) isetshenziswa kabanzi embonini yokumboza futhi isetshenziswa kakhulu njenge-ejenti yokuxhumanisa ukuze kuhlanganiswe amanzi asekelwe emanzini. Njengempahla eluhlaza yama-topcoat nama-primers, ingakhiwa ibe yizinhlaka ze-amino ezinama-alkyd resins, ama-polyester resins, ama-acrylic resins, ama-epoxy resins, njll., futhi isetshenziswa kakhulu ezimotweni, ifenisha, izinto zikagesi zasendlini nakwezinye izimboni.
Ulwazi olwengeziwe mayelana ne-SINOYQX modified melamine formaldehyde resin, sicela usithinte nge-imeyili: [email protected] , noma usithumelele izwi ku: +86-28-8411-1861.
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