Stearic acid, los yog octadecanoic acid, molecular mis C18H36O2, yog tsim los ntawm hydrolysis ntawm cov rog thiab roj thiab yog siv nyob rau hauv zus tau tej cov stearates. Txhua gram yog yaj hauv 21ml ethanol, 5ml benzene, 2ml chloroform lossis 6ml carbon tetrachloride. Nws yog dawb waxy pob tshab khoom lossis me ntsis daj waxy khoom, tuaj yeem tawg mus rau hauv cov hmoov, me ntsis nrog butter tsw. Tam sim no, feem ntau ntawm kev tsim khoom hauv tsev ntawm cov lag luam stearic acid tau tuaj ntawm txawv teb chaws cov roj xibtes, hydrogenation rau hauv cov roj hardened, thiab tom qab ntawd hydrolysis distillation los ua stearic acid.
Stearic acid yog dav siv nyob rau hauv cov tshuaj pleev ib ce, yas yas, pwm tso tus neeg sawv cev, stabilizers, surfactants, roj hmab vulcanisation accelerators, dej repellent, polishing agents, hlau soaps, hlau ntxhia flotation agents, softeners, pharmaceuticals thiab lwm yam organic chemicals. Stearic acid kuj tuaj yeem siv los ua cov kuab tshuaj rau cov roj-soluble pigments, crayon zawv zawg tus neeg saib xyuas, ib daim ntawv siv quav ciab polishing tus neeg saib xyuas, thiab emulsifier rau glycerol stearate. Stearic acid kuj tau siv dav hauv kev tsim cov PVC yas kav, daim hlau, profiles thiab zaj duab xis, thiab yog lub tshav kub stabilizer rau PVC nrog zoo lubrication thiab zoo lub teeb thiab kub stabilization.
Mono- lossis polyol esters ntawm stearic acid tuaj yeem siv los ua cov tshuaj pleev ib ce, tsis-ionic surfactants, plasticisers thiab lwm yam. Nws cov alkali hlau ntsev yog soluble nyob rau hauv dej thiab yog ib tug ntawm cov tseem ceeb Cheebtsam ntawm xab npum, thaum lwm yam hlau ntsev yuav siv tau raws li dej repellent, lubricants, fungicides, xim additives thiab PVC stabilizers.
Lub luag haujlwm ntawm stearic acid hauv cov ntaub ntawv polymeric yog pom los ntawm nws lub peev xwm los txhim kho thermal stability. Cov ntaub ntawv polymer yog qhov ua rau degradation thiab oxidation thaum lub sijhawm ua haujlwm kub, ua rau kev poob qis hauv kev ua haujlwm. Qhov sib ntxiv ntawm stearic acid tuaj yeem ua rau qeeb ntawm cov txheej txheem degradation no thiab txo qhov kev tawg ntawm cov saw hlau molecular, yog li txuas ntxiv lub neej ntawm cov khoom siv. Qhov no yog ib qho tseem ceeb tshwj xeeb hauv kev tsim cov khoom kub-resistant xws li rwb thaiv tsev hlau thiab cov khoom siv tsheb.
Stearic acid muaj cov khoom zoo lubricating zoo li cov roj nplua nyeem. Hauv cov ntaub ntawv polymer, stearic acid txo kev sib txhuam ntawm cov saw hlau molecular, tso cai rau cov khoom ntws yooj yim dua, yog li txhim kho cov txheej txheem ntawm kev ua haujlwm. Qhov no muaj txiaj ntsig zoo rau cov txheej txheem ntau lawm xws li txhaj tshuaj molding, extrusion thiab calendering.
Stearic acid nthuav tawm cov nyhuv plasticiser hauv cov ntaub ntawv polymeric, ua kom cov softness thiab malleability ntawm cov khoom. Qhov no ua rau cov khoom siv yooj yim rau pwm rau hauv ntau yam duab, nrog rau cov yeeb yaj kiab, cov raj thiab cov profiles. Cov nyhuv plasticising ntawm stearic acid feem ntau yog siv rau hauv kev tsim cov ntim yas, hnab yas thiab cov thawv yas.
Cov ntaub ntawv polymeric feem ntau ua rau cov dej nqus dej, uas tuaj yeem degrade lawv cov khoom thiab ua rau corrosion. Qhov sib ntxiv ntawm stearic acid txhim kho cov dej tawm ntawm cov khoom, cia nws nyob ruaj khov hauv qhov chaw ntub dej. Qhov no yog qhov tseem ceeb hauv thaj chaw xws li cov khoom siv sab nraum zoov, cov khoom siv hauv tsev thiab cov khoom siv hluav taws xob hauv tsev.
Stearic acid pab txo cov xim hloov ntawm cov ntaub ntawv polymeric hauv UV thiab thermal ib puag ncig. Qhov no yog ib qho tseem ceeb nyob rau hauv kev tsim cov xim ruaj khov khoom xws li sab nraum zoov billboards, automotive tha xim sab hauv thiab sab nraum zoov rooj tog.
Stearic acid ua raws li kev tiv thaiv-nplaum thiab ntws pab hauv cov ntaub ntawv polymeric. Nws txo qhov adhesion ntawm molecules thiab ua rau cov khoom ntws yooj yim dua, tshwj xeeb tshaj yog thaum lub sij hawm txhaj tshuaj molding txheej txheem. Qhov no txhim kho cov khoom tsim tau thiab txo qhov tsis xws ntawm cov khoom.
Stearic acid yog siv los ua tus neeg sawv cev tiv thaiv kab mob hauv kev tsim cov chiv chiv kom ntseeg tau tias muaj kev sib cais ntawm cov chiv chiv. Qhov no pab txhim kho qhov zoo thiab sib xws ntawm cov chiv thiab ua kom cov nroj tsuag tau txais cov as-ham zoo.
Stearic acid yog siv nyob rau hauv ntau yam kev lag luam thiab cov neeg siv khoom siv.
Post lub sij hawm: Jun-05-2024
