Qhov kev ua tau zoo ntawm epoxy resin castables qia los ntawm lawv cov kev tshawb fawb nruj nruj. Raws li cov khoom siv sib xyaw ua ke sib xyaw ua ke, nws cov qauv tuaj yeem txheeb xyuas los ntawm plaub qhov loj: matrix resin, curing system, functional fillers, thiab interfacial bonding. Txhua yam khoom ua haujlwm sib koom ua ke ntawm qib molecular los tsim cov qauv tag nrho uas sib xyaw ua ke txhua yam muaj zog, hluav taws xob rwb thaiv tsev, thiab kev tiv thaiv ib puag ncig.
Lub matrix resin yog lub hauv paus ntsiab lus ntawm cov qauv, feem ntau yog siv bisphenol A hom lossis hloov kho epoxy resin. Nws cov qauv molecular yog nplua nuj nyob rau hauv hydroxyl thiab epoxy pawg, muab cov khoom muaj zog polar bonding peev xwm thiab reactivity. These active groups, through chemical cross-linking with the curing agent, form a three-dimensional network molecular architecture-this microstructure determines the intrinsic properties of the material: the higher the cross-linking density, the denser the structure, and the better the impermeability and heat resistance; thaum tus ntoo khaub lig nruab nrab- txuas lub network khaws qee qhov kev hloov pauv yooj yim, zam kev tawg tawg.
Kev xaiv ntawm curing system ncaj qha cuam tshuam rau kev ruaj ntseg ntawm cov qauv. Amines, anhydrides, thiab lwm yam tshuaj tua kab mob tau txais lub nplhaib -qhib polymerization nrog epoxy resin, ua tiav qhov kev hloov pauv ntawm cov kua rau hauv lub xeev. Tsis tas li ntawd, los ntawm kev tswj cov tshuaj tiv thaiv tus nqi thiab exothermic nkhaus, tsim ntawm sab hauv tsis xws luag (xws li npuas thiab microcracks) txo. Hauv qee lub tshuab, latent curing agents tau qhia kom ua tiav qhov sib npaug ntawm chav - qhov kub thiab txias thiab siab - kub kho sai, ua kom cov txheej txheem tswj tau thaum lub sij hawm casting loj - cov khoom loj.
Functional fillers yog indispensable reinforcing theem nyob rau hauv cov qauv. Inorganic fillers (xws li fused silica hmoov, alumina, thiab txhuas hydroxide) tau ntim rau hauv cov matrix resin raws li cov gradations. Ntawm qhov tod tes, lawv txo qis kev txo qis los ntawm "kev ua haujlwm ntim" (los ntawm ntau dua 30% piv rau cov tshuab ntshiab huv); Ntawm qhov tod tes, lawv txhim kho tag nrho lub zog los ntawm kev sib cuam tshuam ntawm cov khoom. Cov thev naus laus zis kho deg rau cov khoom ntim (xws li kev hloov kho silane coupling tus neeg sawv cev) ntxiv kom zoo dua lawv cov kev sib raug zoo nrog cov resin, ua rau kev ntxhov siab hloov pauv tau zoo dua thiab zam kev ua haujlwm tsis zoo los ntawm kev cuam tshuam ntawm kev sib tshuam.
Thaum kawg, cov khoom sib xyaw ua ke los ntawm cov txheej txheem xws li lub tshuab nqus tsev nplawm thiab dynamic defoaming. Thaum lub sij hawm kho, cov ntu molecular saw tau npaj kom zoo, tsim cov qauv macroscopically homogeneous thiab microscopically multiphase composite qauv. Cov qauv no khaws cov hluav taws xob rwb thaiv tsev thiab kev sib txuas zoo ntawm cov resin, thaum ua tiav cov khoom siv hluav taws xob nyob ze rau cov khoom siv hluav taws xob los ntawm kev muab tub lim, ua rau nws yog cov khoom sib khi zoo tshaj plaws uas sib npaug kev ua haujlwm thiab kev ntseeg tau.
