Yog vim li cas thiab kev daws teeb meem ntawm epoxy resin crystallization

Thaum lub caij nplooj zeeg thiab lub caij ntuj no thiab thaum qhov kub thiab txias qis, ntau tus neeg siv khoom feem ntau ntsib cov teeb meem hauv qab no thaum siv epoxy resin nplaum: epoxy resin nplaum qee zaum ua turbid thiab indistinct, ib nrab lumped, nyob rau hauv tib lub xeev xws li nplej nplej thiab ntses noob, thiab txawm yuav ua tau ib yam khoom, uas coj inconvenience rau kev tsim kho ntawm iav fiber reinforced plastics.
Qhov tseeb, qhov no yog qhov tshwm sim ntawm epoxy resin crystallization. Yog li, dab tsi yog qhov tshwm sim ntawm cov txheej txheem crystallization? Yuav daws qhov teeb meem ntawm crystalline epoxy resin li cas? Tom ntej no, peb tau piav qhia luv luv thiab piav qhia txog cov teeb meem ntsig txog crystallization.
Dab tsi yog qhov tshwm sim ntawm crystallization txheej txheem?
Raws li ib txwm muaj, cov kua epoxy resin tsis muaj xim thiab pob tshab, thiab muaj peev xwm ntws. Feem ntau, crystallization yog ib qho yooj yim tshwm sim nyob rau hauv qhov chaw uas qhov kub thiab txias sib txawv ntawm nruab hnub thiab hmo ntuj yog loj heev. Tsis tas li ntawd, epoxy resin tsim nyob rau hauv lub caij ntuj sov kuj yog ib qho yooj yim rau crystallize los ntawm cia siv nyob rau hauv lub caij ntuj no. Nov yog ob txheej txheem ntawm crystallization:
1. Thaum cov xim ntawm cov kua epoxy resin nplaum ua grey, dawb ntab muaju, siv lead ua lumps los yog cov khoom ua tiav tiav, thiab cov pob tshab pob tshab maj mam ua plooj, pos huab lossis milky, qhov no yog lub cim ntxov ntawm epoxy resin crystallization.
2. Ntau thiab ntau dua dawb crystals yuav sau nyob rau hauv qab ntawm lub thawv, thiab cov xuab zeb zoo li crystals yuav mus ntxiv mus txog rau thaum tag nrho cov ntsiab lus yog solidified mus rau hauv crystals. Cov txheej txheem no yeej zoo ib yam li cov zib ntab muaju.
Cov qauv siv lead ua no thim rov qab thiab tuaj yeem rov qab mus rau lub xeev ua kua hauv qee qhov kub thiab txias yam tsis muaj kev cuam tshuam cov khoom lag luam. Nws yog tib qho laj thawj uas qhov xwm txheej ntawm dej nws tus kheej yuav tsis hloov pauv hauv cov txheej txheem rov ua kom khov thiab yaj ntawm dej.
Vim li cas crystallization tshwm sim?
Muaj ntau qhov laj thawj rau crystallization ntawm epoxy resin, feem ntau suav nrog cov hauv qab no:
A. High purity: tag nrho cov muaju yog cov khoom siv purity siab, thiab yog li epoxy resin. Qhov siab dua qhov purity, qhov nqaim ntawm molecular faib, qhov yooj yim dua qhov crystallization.
B. Tsawg viscosity: qhov qis viscosity, qhov ceev ntawm crystallization tus nqi.
C. Cov impurities: cov khoom impurities feem ntau yog cov noob ntawm kev loj hlob siv lead ua, thiab ntxiv qee cov xim precipitated thiab fillers tuaj yeem ua rau crystallization. Hauv qhov sib piv, qhov loj me me thiab qhov sib ntxiv ntau dua tsis yooj yim rau induce crystallization.
D. Qhov kub thiab txias: xws li qhov ntsuas kub hloov pauv ntawm 20-30 degree yog ib qho ua rau crystallization, thiab qhov kub thiab txias hloov ntawm nruab hnub thiab hmo ntuj yuav pib los yog ua kom lub crystallization npaum li cas. Tsis tas li ntawd, ultra-low kub (qis dua 5 degree) yuav ceev crystallization.
E. Moisture: qhov siab dua cov dej noo, nws yooj yim dua rau crystallize.
Tag nrho cov resins thiab curing agents muaj qhov ua tau ntawm crystallization, uas yog kev hloov ntawm cov tshuaj los ntawm cov kua mus rau lub xeev crystalline. Lub hauv paus ntsiab lus crystallization ntawm epoxy resin zoo ib yam li lwm yam khoom. High purity, tsis tshua muaj viscosity, impurities, tsis tshua muaj kub qhov chaw, txias thiab kub cycles yuav ua rau kom muaj peev xwm ntawm crystallization.
Epoxy resin yog rhiab rau qhov kub thiab txias. Nyob rau hauv qhov chaw txias heev lossis nrog qhov kub thiab txias, nws yooj yim heev los hloov cov kua rau hauv cov khoom, uas yog, crystallization ntawm epoxy resin.
Yuav ua li cas kom tsis txhob crystallization?
1. Txo cov purity ntawm epoxy resin, xws li ntxiv lwm hom epoxy resin.
2. Siv epoxy resin uas tsis tshua muaj crystallization nyiam los yog tsis-crystallization.
3. Cia tej yam kev mob: qhov cia kub yog siab tshaj 40 degree los tiv thaiv crystallization. Feem ntau, yog tias qhov kub siab tshaj 25 degree, qhov kev pheej hmoo ntawm crystallization tuaj yeem txo qis, tab sis nws yog ib qho tsim nyog kom tsis txhob muaj qhov kub thiab txias ntau dhau. Rau qhov xav tau ntawm cov av noo, qhov txheeb ze av noo feem ntau yuav tsum tsawg dua 50 feem pua. Nyob rau tib lub sijhawm, kev sib khi ntawm lub pob yuav tsum nruj me ntsis kom tsis txhob nqus dej thiab crystallization.
Kuv yuav ua li cas yog tias epoxy resin nplaum crystallizes?
1. Dej da dej cua sov txoj kev:
Muab cov epoxy resin tso rau hauv dej nrog dej kub ntawm 50 degree thiab 60 degree. Thaum cua sov, do lub colloid nyob rau hauv ib qho kev taw qhia kom paub meej tias tag nrho cov muaju yog yaj tag. Ib qho me me uas tsis yog siv lead ua tuaj yeem siv los ua "noob" los ua kom rov ua kom rov ua kom rov zoo li ob peb hnub.
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Yog li ntawd, lub sij hawm sib tov yuav tsum tsis txhob luv dhau los xyuas kom meej tias cov muaju ntawm cov phab ntsa thiab hauv qab ntawm lub thawv kuj tseem yaj tag thiab cov cua kub sib txawv. Kev tsim kho tsuas yog nqa tawm tom qab sib tov sib npaug kom txog thaum crystallization ploj tag.
Lus Cim: Cov rhuab epoxy resin nplaum yuav tsum tau txias kom sov li qub ua ntej siv, txwv tsis pub nws yooj yim tawg.
2. Cov khoom siv cua sov cua sov:
Lub epoxy resin nplaum yuav tsum tau teem caij thiab muab tso rau hauv ib lub nplhaib, nrog rau qhov dav ntawm 1m nyob rau hauv nruab nrab kom tso cov khoom siv cua sov, thiab cov epoxy resin yuav tsum tau muab qhwv nrog cov ntaub yas lossis cov ntaub qhwv xim los tsim ib qho chaw kaw, ua kom sov tsis tu ncua kom txog rau thaum cov epoxy resin rov qab mus rau nws thawj lub xeev.
3. Hnub ci cua sov:
Ci lub epoxy resin nrog lub hnub ci teeb, do nws thaum cua sov, kom txog thaum lub crystal yog yaj tag, thiab cov gel tuaj yeem siv dua tom qab lub xeev pib rov qab los.
4. Lwm yam kev ntsuas cua sov tsim nyog kuj tuaj yeem daws qhov teeb meem ntawm epoxy resin crystallization.
Yog tias crystallization tshwm sim dua, sov nws dua thiab rov ua cov txheej txheem melting. Cov epoxy resin tuaj yeem rov ua dua tom qab khaws cia ntawm 50 degree rau ob peb teev. Lub melted kua epoxy resin tseem tuaj yeem siv tau, tab sis nws tsis haum rau kev kho cua sov rau tus neeg sawv cev kho uas tau ntxiv lawm.
Cov lus qhia: ua tib zoo saib xyuas kom txo qhov kub ntawm qhov hloov pauv thaum thauj thiab khaws cia. Nws raug nquahu kom khaws cia rau hauv qhov chaw qhuav thiab qhov kub thiab txias tsis tu ncua warehouse. Thaum siv, tsis txhob sib tov ntau dhau ib zaug, thiab siv tam sim ntawd tom qab siv, thiab xyuas kom meej tias tsis muaj resin residue ntawm lub nozzle, lub hau npog thiab lwm qhov chaw tom qab siv los tiv thaiv kev tsim cov muaju ntawm cov chaw no.
Xaus: Lub crystallization ntawm epoxy resin yog cov txheej txheem thim rov qab uas tuaj yeem hloov nrog qhov kub thiab txias, thiab tsis muaj kev cuam tshuam rau kev sib koom ua ke thiab kev txhawb zog ntawm epoxy resin. Txawm hais tias crystallization tshwm sim, nws tuaj yeem siv tau tom qab cua sov kom txog thaum nws softening ploj.