Hloov kho melamine formaldehyde resin yog ib qho polymer tau los ntawm cov tshuaj tiv thaiv ntawm melamine thiab formaldehyde, tseem hu ua melamine formaldehyde resin lossis melamine resin.
Cov khoom siv lub cev: Cov tshuaj melamine formaldehyde resin uas kho tau zoo tsis muaj xim thiab pob tshab, ruaj khov hauv dej npau, thiab siv tau ntawm 150 ° C. Nws muaj cov khoom tua tus kheej, cov khoom siv arc, thiab cov khoom siv kho tshuab zoo.
Cov khoom siv tshuaj lom neeg: Cov khoom siv raw yog melamine thiab 37% formaldehyde aqueous tov. Cov molar piv ntawm formaldehyde rau melamine yog 2 ~ 3. Cov naj npawb sib txawv ntawm N-hydroxymethyl hloov pauv yog tsim nyob rau hauv ib kauj ruam, thiab tom qab ntawd ntxiv condensed rau hauv cov kab tawm. Cov tshuaj tiv thaiv kab mob sib txawv, thiab qhov hnyav molecular ntawm cov khoom sib txawv. Nws tuaj yeem ua tau los ntawm dej-soluble mus rau hardly soluble nyob rau hauv dej, los yog txawm insoluble thiab infusible khoom. Tus nqi pH muaj qhov cuam tshuam zoo rau cov tshuaj tiv thaiv. Cov tshuaj resin npaj saum toj no tsis yooj yim rau khaws cia, thiab cov tshuaj tsuag kom qhuav yog feem ntau siv hauv kev lag luam los tsim cov khoom hmoov. Melamine resin tsis kho ntawm chav tsev kub. Nws yog feem ntau thermally kho ntawm 130-150 ° C. Ntxiv ib qho me me ntawm cov kua qaub rau catalyze tus nqi kho tuaj yeem ua rau kom tus nqi kho.
Daim ntawv thov hauv kev lag luam tawv: Hauv kev lag luam tawv, melamine resin feem ntau yog siv ua ntej tanning, rov tanning, thiab filling resin, ntawm cov trimethyl melamine resin yog siv dav amino resin. Amino resin muaj cov txheej txheem tanning zoo li aldehyde tanning: lub prepolymer nkag mus rau ntawm daim tawv nqaij, thiab raws li tus nqi pH poob, lub prepolymer cia li condenses rau hauv molecules ntawm ib tug tej yam me me ntawm daim tawv nqaij. Los ntawm cov condensation ntawm lub active -NHCH2OH nyob rau hauv lub molecule nrog cov amino pawg ntawm collagen peptide saw, ib tug covalent cross-linking system yog tsim los ua kom tiav lub hom phiaj ntawm tannins.
Vim lub siab reactivity ntawm methylal, trimethyl melamine molecules yog nquag mus rau polycondensation tshua, ua tsis-linear cross-linked molecules thiab poob tanning. Tam sim no, cov hau kev siv tau dav siv yog kom thaiv cov pab pawg hydroxules, lossis qhia cov pab pawg hydrophilic rau hauv cov qauv molubility.
Tam sim no, melamine resin tanning tus neeg sawv cev yog npaj nyob rau hauv tsev thiab txawv teb chaws los ntawm condensation ntawm melamine, dicyandiamide ib leeg los yog tov nrog formaldehyde, thiab lawv yog tsim nyog hloov raws li xav tau.
Daim ntawv thov hauv kev lag luam ntawv:
Vim hais tias melamine formaldehyde resin muaj hydroxymethyl pawg, nws tuaj yeem tsim cov qauv etherified ntawm fiber ntau. Qhov kev sib txuas ntawm qhov sib txawv ntawm cov molecules no ua rau dej, ua rau daim ntawv moist. Yog li ntawd, nws yog tsuas yog siv los ua tus neeg sawv cev ntub dej thiab tus neeg sawv cev dej hauv kev lag luam ntawv.
Anionic hloov melamine formaldehyde resin
Nws yog tsuas yog sulfonated melamine resin. Hauv kev sib piv, sulfamate-hloov resin zoo dua thiab siv dav. Cov khoom no tuaj yeem kho tau raws li acidic, nruab nrab, lossis alkaline tej yam kev mob, thiab tuaj yeem muab ntxiv rau slurry lossis siv txheej txheej. Qhov teeb meem yog tias thaum tus hloov kho reacts nrog formaldehyde, nag lossis daus thiab crystallization tshwm sim, thiab nws nyuaj rau lim tawm.
Cationic hloov kho melamine formaldehyde resin
Melamine resin hloov nrog cationic reagents xws li triethanolamine, dimethylamine, thiab lwm yam muaj hluav taws xob zoo, tuaj yeem nqus tau los ntawm fibers sai, thiab tuaj yeem kho tau ntawm tus nqi pH siab dua. Nws zam qhov tsis zoo ntawm cov melamine-formaldehyde resin rau ntawm daim ntawv dawb thiab durability. Tam sim no, kev tshawb fawb tseem ceeb hauv daim teb no hauv tsev thiab txawv teb chaws yog siv cov cawv me me, xws li methanol, butanol, thiab lwm yam, raws li cov neeg ua haujlwm etherifying thiab me me ntawm cationic modifiers nyob rau hauv catalysis ntawm p-toluene sulfonic acid los thaiv lawv cov active pab pawg thiab txhim kho cov khoom stability. .
Cov txheej txheem tseem ceeb los txo cov ntsiab lus ntawm cov formaldehyde dawb yog: siv cov organic teeb meem nrog oxidizing muaj peev xwm, xws li formic acid thiab hydrogen peroxide, uas tuaj yeem oxidize formaldehyde rau hauv CO2 thiab dej. Thaum lub sij hawm npaj cov txheej txheem, formaldehyde neutralizers xws li borax, propylene glycol, thiab sodium bisulfite ntxiv, thiab lub tshuab nqus tsev distillation yog siv.
Kev siv hauv kev lag luam txheej
Melamine formaldehyde resin hloov kho los ntawm etherification ntawm cov dej cawv tsawg (xws li methanol, butanol, isobutane) yog siv dav hauv kev lag luam txheej thiab feem ntau yog siv los ua tus neeg sawv cev sib txuas rau cov txheej txheem dej. Raws li cov khoom siv raw rau topcoats thiab primers, nws tuaj yeem tsim rau hauv amino resins nrog alkyd resins, polyester resins, acrylic resins, epoxy resins, thiab lwm yam, thiab yog dav siv hauv tsheb, rooj tog, khoom siv hauv tsev thiab lwm yam lag luam.
Xav paub ntxiv txog SINOYQX hloov kho melamine formaldehyde resin, thov hu rau peb ntawm email: [email protected] , lossis hu rau peb ntawm: + 86-28-8411-1861.
Qee cov duab thiab cov ntawv luam tawm los ntawm Is Taws Nem, thiab cov ntawv pov thawj yog los ntawm tus sau thawj. Yog tias muaj kev ua txhaum cai, thov hu rau peb kom tshem tawm.