Kaolin: Ib qho khoom siv ua kom zoo rau cov yas niaj hnub

Kaolin, ib hom mineral silicate uas muaj nyob hauv ntuj, tau dhau los ua ib qho ntawm cov khoom siv fillers uas siv dav tshaj plaws hauv kev lag luam yas. Kev sib xyaw ua ke ntawm kev siv nyiaj tsawg, kev ua haujlwm yooj yim, thiab kev ua haujlwm zoo dua, nws muab cov txiaj ntsig zoo rau polyolefins, PVC, PET, polyamides, thiab lwm yam thermoplastic compounds. Rau cov tuam txhab tsim khoom uas xav txhim kho qhov zoo thaum tswj cov nqi, kaolin yog qhov kev xaiv tseem ceeb.

Nws cov qauv platelet thiab qhov loj ntawm cov khoom me me ua rau muaj kev txhim kho zoo kawg nkaus. Cov kaolin uas tau faib kom raug yuav ua rau lub zog tensile, rigidity, thiab kev tiv thaiv kev cuam tshuam tsis tas yuav txo qhov tawv, pab tsim cov khoom sib dua tab sis muaj zog dua. Nws kuj ua haujlwm ua tus neeg sawv cev nucleating, txhim kho cov qauv siv lead ua thiab txo qhov shrinkage thiab warpage thaum lub sijhawm molding, ua kom ntseeg tau tias cov kav dej, profiles, thiab cov khoom siv tsheb ruaj khov dua.

Tsis tas li ntawd xwb, kaolin ua rau cov yas tiv thaiv thiab ua kom sov zoo dua. Txawm tias thaum tsis muaj zog, nws txo cov pa roj thiab cov dej noo, ua rau cov yas siv tau ntev dua. Cov kaolin uas tau calcined ua rau cov yas tiv thaiv cua sov thiab ua kom cov yas ruaj khov dua thaum kub heev. Nws kuj ua rau cov yas tiv taus tshuaj, rwb thaiv hluav taws xob, thiab tiv thaiv kev thaiv.—tseem ceeb rau cov cable jacketing, electronic housings, thiab industrial containers.

Qhov zoo ntawm kev zoo nkauj thiab kev ua cov khoom ua rau kaolin txawv ntawm lwm cov khoom siv. Qhov dawb siab ua kom cov xim sib phim zoo thiab txo cov xim siv, thaum nws cov qauv du ua rau cov nplaim ci thiab sib xws. Kaolin txhim kho cov dej yaj thiab kev ruaj khov ntawm extrusion, txhawb nqa kev ua haujlwm ntau dua thiab pov tseg tsawg dua. Nrog rau cov theem thauj khoom ib txwm muaj txij li 15% txog 40%, nws txo qis kev siv cov resin yam tsis muaj kev cuam tshuam rau kev ua haujlwm kawg.

Cov qib hloov kho ntawm qhov chaw nthuav dav kev sib raug zoo nrog cov polymer matrices, ua rau muaj kev sib kis thiab txhawb nqa cov teebmeem. Niaj hnub no, cov yas uas muaj kaolin pab rau kev ntim khoom, tsheb, kev tsim kho, khoom siv hluav taws xob, thiab cov khoom siv rau cov neeg siv khoom, ua tau raws li cov qauv kev cai thiab kev ua tau zoo.

Hauv kev xaus lus, kaolin yog ntau tshaj li qhov yooj yim filler—nws yog ib yam khoom siv ntau yam uas ua rau cov khoom yas muaj zog, ruaj khov, thiab ua kom zoo dua. Raws li kev lag luam xav tau kev ua tau zoo dua thiab kev ruaj khov, kaolin yuav txuas ntxiv mus ua ib qho kev daws teeb meem zoo rau cov qauv yas tshiab thiab pheej yig.