Phenolic resin

Phenolic resin kuj hu uabakelite, tseem hu ua bakelite hmoov.Keeb xeeb tsis muaj xim (dawb) lossis xim daj-xim av pob tshab, kev lag luam feem ntau ntxiv cov tshuaj pleev xim kom pom xim liab, daj, dub, ntsuab, xim av, xiav thiab lwm yam xim, thiab nws yog granular thiab powdery.Resistant mus rau qaug zog acid thiab qaug zog alkali, nws yuav decompose nyob rau hauv cov ntaub ntawv ntawm muaj zog acid thiab corrode nyob rau hauv cov ntaub ntawv ntawm muaj zog alkali.Soluble nyob rau hauv acetone, dej, cawv thiab lwm yam organic solvents.Nws yog tau los ntawm polycondensation ntawm phenolic aldehyde los yog nws derivatives.Khoom phenolic resin yog daj, pob tshab, amorphous blocky tshuaj, reddish vim dawb phenol, qhov nruab nrab lub ntiajteb txawj nqus ntawm qhov chaw yog hais txog 1.7, yooj yim soluble nyob rau hauv cawv, insoluble nyob rau hauv dej, ruaj khov rau dej, qaug zog acid thiab qaug zog alkali kua.Nws yog ib tug resin ua los ntawm polycondensation ntawm phenol thiab formaldehyde nyob rau hauv catalyst tej yam kev mob, neutralization thiab ntxuav nrog dej.Vim qhov kev xaiv ntawm catalyst, nws tuaj yeem muab faib ua ob hom: thermosetting thiab thermoplastic.Phenolic resin muaj cov kua qaub zoo, cov khoom siv kho tshuab thiab cov cua sov, thiab yog siv dav hauv kev tiv thaiv corrosion engineering, adhesives, nplaim retardant cov ntaub ntawv, sib tsoo log manufacturing thiab lwm yam lag luam.

Phenolic resin hmoov yog ib hom thermoplastic phenolic resin tsim los ntawm polycondensation ntawm phenol thiab formaldehyde nyob rau hauv acidic nruab nrab.Nws tuaj yeem yaj hauv ethanol thiab ua thermosetting los ntawm kev ntxiv 6-15% urotropine.Nws tuaj yeem raug molded ntawm 150°C thiab muaj qee yam muaj zog txhua yam.thiab hluav taws xob rwb thaiv tsev.

Lub ntsiab feature ntawm phenolic resin yog kub tsis kam, thiab nws muaj peev xwm tswj tau nws cov qauv kev ncaj ncees thiab seem stability txawm nyob rau hauv high kub.Yog li ntawd, phenolic resins yog siv nyob rau hauv high kub teb, xws li cov ntaub ntawv refractory, kev sib txhuam cov ntaub ntawv, adhesives thiab foundry industries.

Ib qho tseem ceeb daim ntawv thov ntawm phenolic resin yog raws li ib tug binder.Phenolic resins muaj ntau yam thiab sib xws nrog ntau yam organic thiab inorganic fillers.Tsim kom raug phenolic resins ntub tawm sai heev.Thiab tom qab kev sib txuas ntawm kev sib txuas, nws tuaj yeem muab cov khoom siv dag zog uas xav tau, kev tiv thaiv kub thiab hluav taws xob rau cov cuab yeej abrasive, cov ntaub ntawv refractory, cov ntaub ntawv sib txhuam thiab bakelite.

Cov dej-soluble phenolic resins los yog cawv-soluble phenolic resins yog siv los impregnate ntawv, paj rwb ntaub, iav, asbestos thiab lwm yam khoom zoo sib xws los muab cov neeg kho tshuab lub zog, hluav taws xob khoom, thiab lwm yam. Piv txwv xws li hluav taws xob rwb thaiv tsev thiab mechanical lamination manufacturing, clutch discs thiab lim ntawv rau automotive lim.

Phenolic resin muaj nuj nqi:

Kev ua haujlwm kub: Qhov tseem ceeb tshaj plaws ntawm phenolic resin yog qhov kub thiab txias, txawm tias qhov kub thiab txias, nws tuaj yeem tswj tau nws cov qauv kev ntseeg siab thiab qhov ruaj khov.

Bond zog: Ib qho tseem ceeb daim ntawv thov ntawm phenolic resin yog raws li ib tug binder.Phenolic resins muaj ntau yam thiab sib xws nrog ntau yam organic thiab inorganic fillers.

High carbon residue tus nqi: Nyob rau hauv inert gas tej yam kev mob nrog ib tug kub ntawm txog 1000°C, phenolic resins yuav tsim cov pa roj carbon ntau, uas yog qhov tsim nyog rau kev tswj xyuas cov qauv kev ruaj ntseg ntawm phenolic resins.

Tsis tshua muaj pa luam yeeb thiab tsis muaj toxicity: Piv nrog rau lwm yam resin systems, phenolic resin system muaj qhov zoo ntawm cov pa luam yeeb tsawg thiab tsawg toxicity.Nyob rau hauv cov ntaub ntawv ntawm combustion, phenolic resin system tsim los ntawm scientific formula yuav maj mam decompose los tsim hydrogen, hydrocarbons, dej vapor thiab carbon oxides.Cov pa luam yeeb tsim thaum lub sij hawm decomposition yog me me, thiab cov toxicity kuj tsawg.

Tshuaj tiv thaiv: Hla-txuas phenolic resin tuaj yeem tiv taus qhov decomposition ntawm txhua yam tshuaj.Xws li roj av, roj av, cawv, glycol, roj thiab ntau yam hydrocarbons.

Kev kho cua sov: Kev kho cua sov yuav ua rau cov iav hloov pauv kub ntawm cov khoom kho, uas tuaj yeem txhim kho cov khoom ntawm cov resin ntxiv.

Foamability: Phenolic ua npuas ncauj yog ib hom ua npuas ncauj yas tau los ntawm foaming phenolic resin.Piv nrog rau polystyrene ua npuas ncauj, polyvinyl chloride ua npuas ncauj, polyurethane ua npuas ncauj thiab lwm yam ntaub ntawv uas dominated lub lag luam nyob rau hauv thaum ntxov theem, nws muaj tshwj xeeb zoo heev kev ua tau zoo nyob rau hauv cov nqe lus ntawm nplaim taws retardancy.