Ma resini a epoxy amagwiritsidwa ntchito kwambiri mu zomatira zamafakitale ndi zokutira chifukwa cha mphamvu zawo zolimba zomangira komanso kukana mankhwala, koma kufooka kwawo komanso kuchepa kwawo kumatha kuchepetsa magwiridwe antchito pakugwiritsa ntchito molimbika. Ufa wa Wollastonite waonekera ngati chowonjezera champhamvu cholimbitsa, kuthana ndi zofooka izi pomwe ukukulitsa mphamvu zazikulu za epoxy composites kuti zigwiritsidwe ntchito m'mafakitale omanga, opanga, ndi okonzanso.
Kukana kugwedezeka ndi kusintha kwakukulu komwe kumaperekedwa ndi ufa wa wollastonite mu ma resins a epoxy. Kapangidwe kake ka acicular ka chowonjezeracho kamagwira ntchito ngati choletsa ming'alu: pamene epoxy ikukhudzidwa kapena kupsinjika, tinthu tofanana ndi singano timawongolera ndikuyamwa mphamvu, zomwe zimaletsa kufalikira kwa ming'alu. Izi zimasintha epoxy yofooka kukhala chinthu cholimba komanso cholimba, zomwe zimapangitsa kuti ikhale yoyenera kugwiritsidwa ntchito monga zomatira zomangira pakupanga (konkriti yomangirira kapena chitsulo) ndi zokutira zoteteza pamakina, komwe kukana kugwa, kugundana, kapena kugwedezeka ndikofunikira. Mayeso akuwonetsa kuti kuwonjezera ufa wa wollastonite wa 15–25% kumatha kuwonjezera mphamvu ya epoxy ndi 40–60% poyerekeza ndi utomoni wosadzazidwa.
Kumatirira ku zinthu zomangira ndi chinthu china chofunikira chomwe chimakulitsidwa ndi ufa wa wollastonite. Malo ake okhala ndi mabowo ndi malo ake okwera amalimbikitsa kulumikizana kwa makina ndi epoxy matrix ndi zinthu zomangira (monga chitsulo, matabwa, kapena konkire), zomwe zimapangitsa kuti pakhale mgwirizano wolimba. Izi ndizothandiza makamaka mu zomatira zamafakitale zomwe zimagwiritsidwa ntchito pomatirira zinthu zosiyanasiyana, komwe kumamatirira kosayenera kungayambitse kulephera kwa mafupa. Mu zokutira, kumamatira bwino kumalepheretsa kuchotsedwa ndi kuchotsedwa kwa mafupa, ngakhale m'malo ozizira kapena otetezedwa ndi mankhwala, zomwe zimapangitsa kuti malo otetezedwa azikhala nthawi yayitali.
Kuchepetsa kuuma kwa epoxy resins ndi vuto lofala kwambiri mu ma epoxy resins, zomwe zimapangitsa kuti pakhale kusakhazikika kwa kukula, kupsinjika kwamkati, komanso mphamvu yogwirizana. Ufa wa Wollastonite umachepetsa kuchepa kwa mpaka 30% panthawi yokonza, chifukwa tinthu take tolimba timaletsa kufupika kwa epoxy matrix. Izi ndizofunikira kwambiri pakugwiritsa ntchito komwe kumafuna kuwongolera kolondola kwa kukula, monga kuyika kwamagetsi kapena kupanga nkhungu, komwe kuchepa kumatha kusokoneza zigawo kapena kupanga mipata. Kuchepetsa kuchepa kwa kuuma kumachepetsanso chiopsezo cha ming'alu mu zokutira zokhuthala kapena zomangira zazikulu, kuonetsetsa kuti zikugwira ntchito kwa nthawi yayitali.
Kukana kwa mankhwala kumawonjezeka mu ma epoxy composites olimbikitsidwa ndi wollastonite. Kusagwira ntchito kwa chowonjezeracho (chimalimbana ndi ma acid, alkalis, ndi zosungunulira) komanso kuthekera kwake kupanga matrix okhuthala a epoxy kumachepetsa kulowa kwa zinthu zowononga. Izi zimapangitsa kuti ma composites akhale oyenera kugwiritsidwa ntchito m'malo opangira mankhwala, m'malo oyeretsera madzi akuda, komanso m'malo am'madzi, komwe kukhudzana ndi mankhwala oopsa kapena madzi amchere kumatha kuwononga epoxy yosalimbikitsidwa.
Ubwino wokonza ufa wa wollastonite umapangitsa kuti ufa wa wollastonite ukhale wosavuta kuuphatikiza mu epoxy formulations. Kuchepa kwa mafuta ake kumalola kuti ukhale wolemera kwambiri popanda kukhuthala kwambiri, kuonetsetsa kuti epoxy imakhalabe yosavuta kusakaniza, kuyika, ndi kufalitsa. Mtundu woyera wa ufawo sukhudzanso mtundu wa epoxy, zomwe zimapangitsa kuti utoto ukhale wosiyana ndi utoto. Pa ma epoxy awiri, wollastonite simasokoneza momwe imakhalira, kuonetsetsa kuti nthawi yokhazikika komanso kulumikizana kwathunthu.
Kukula kwa tinthu tating'onoting'ono ndi njira zochizira pamwamba zimathandiza kusintha momwe tingagwiritsire ntchito epoxy. Ma grade abwino (5-10 microns) amagwiritsidwa ntchito mu zokutira zopyapyala ndi zomatira komwe kumafunika kumalizidwa kosalala, pomwe ma grade okhwima (20-40 microns) amapereka mphamvu zambiri mu ntchito za kapangidwe kake. Wollastonite yokonzedwa pamwamba (yokhala ndi zolumikizira za silane) imakulitsa kuyanjana ndi ma epoxy resins, kukulitsa kufalikira ndi kulumikizana pa mawonekedwe a filler-matrix kuti agwire bwino ntchito.
Kugwiritsa ntchito bwino ndalama kumapangitsa kuti ufa wa wollastonite ugwiritsidwe ntchito mu epoxy composites. Poyerekeza ndi ulusi wagalasi kapena zowonjezera za ulusi wa kaboni, wollastonite imapereka ndalama zambiri komanso imapereka kusintha kofanana ndi makina. Kulemera kwake kwakukulu kumachepetsanso kuchuluka kwa utomoni wa epoxy wokwera mtengo wofunikira, kumachepetsa ndalama zonse zopangira popanda kuwononga magwiridwe antchito.
Mwachidule, kuthekera kwa ufa wa wollastonite kukonza kukana kukhudzana ndi mphamvu, kuwonjezera kumamatira, kuchepetsa kuuma, ndikuwonjezera kukana kwa mankhwala kumapangitsa kuti ikhale chowonjezera chabwino kwambiri cha epoxy resin composites. Kusavuta kwake kukonza komanso kugwiritsa ntchito bwino ndalama kumathandizanso kuti igwiritsidwe ntchito mu zomatira zamafakitale ndi zokutira, komwe kulimba ndi magwiridwe antchito ndizofunikira kwambiri kuti zinthu ziyende bwino kwa nthawi yayitali.
Nthawi yotumizira: Julayi-31-2025
