Qhov Tseem Ceeb Qhov txawv - Emollient vs. Humectant
Cov neeg siv khoom ib txwm muaj qee qhov tsis meej pem txog qhov sib txawv ntawm emollient thiab humectant. Txhawm rau kom meej meej nws yooj yim, ib qho emollient yog ib qho khoom siv lossis kev sib txuas ntawm cov tshuaj siv tshuaj tshwj xeeb tsim los ua kom cov txheej txheem sab nrauv ntawm daim tawv nqaij lossis epidermis ntau mos thiab hloov tau, los ntawm kev txhim kho nws cov dej / cov dej noo. Nyob rau hauv kev sib piv rau qhov no, ib tug humectant yog ib tug constituent los yog ua ke ntawm cov tshuaj uas yog hygroscopic thiab nqus tau noo noo los ntawm huab cua. Yog li, ib lossis ntau pawg hydrophilic txuas nrog humectants molecules. Piv txwv ntawm cov hydrophilic pawg no yog amines (-NH3) xws li urea lossis amino acids, carboxyl pawg (-COOH) xws li fatty acids lossis alpha hydroxy acids, pawg hydroxyl (-OH) xws li glycerin, sorbitol, thiab butylene, los yog lwm yam glycols. Lub luag haujlwm tseem ceeb ntawm cov tshuaj humectant yog tsim cov hydrogen bonds nrog cov dej molecules. Txawm hais tias zoo sib xws hauv kev ua haujlwm, moisturizers tuaj yeem tshwm sim ntawm daim tawv nqaij lipids thiab sterols, nrog rau kev tshwm sim los yog hluavtaws emollients, rog, lossis roj lubricating. Qhov no yog qhov tseem ceeb thiab yooj yim txheeb xyuas qhov sib txawv ntawm emollient thiab humectant.
Emollient yog dab tsi?
Emollients, tseem hu ua moisturizer, txhim kho cov tsos ntawm daim tawv nqaij los ntawm smoothing crumbling los yog scaly ntawm daim tawv nqaij. Ntau ntau hom hluavtaws emollient esters thiab roj yog tsim los ntawm kev lag luam tshuaj pleev ib ce. Emollients yog categorized los ntawm lawv lub peev xwm kis tau rau ntawm daim tawv nqaij. Ntxiv mus, emollient lipids ib txwm muaj tuaj yeem pom nyob rau hauv daim tawv nqaij uas tuaj yeem nce tus nqi kho daim tawv nqaij. Lawv feem ntau yog siv rau hauv ntau yam kev tsim kho xws li tshuaj pleev ib ce thiab kev lag luam tshuaj.
Humectant yog dab tsi?
A humectant yog qhov ntxeev ntawm lub desiccant vim nws yog cov khoom siv hygroscopic siv los ua kom cov khoom ntub. Humectants muaj cov khoom xyaw xws li glycerin, urea thiab pyrrolidone carboxylic acid. Glycerin feem ntau yog siv vim nws cov nqi qis thiab kev ua haujlwm siab. Lawv tau siv ntau yam khoom tsim kho xws li zaub mov, tshuaj pleev ib ce, tshuaj thiab tshuaj tua kab kev lag luam. Lub tshuab nqus dej nqus thiab khaws cov dej noo nyob rau hauv qhov chaw tam sim ntawd los ntawm kev nqus, nqus cov dej vapor mus rau hauv thiab / lossis hauv qab lub cev / khoom lub ntsej muag.
Qhov txawv ntawm Emollient thiab Humectant yog dab tsi?
Definition:
Emollients:
Adjective: muaj qhov zoo ntawm softening lossis soothing ntawm daim tawv nqaij
Noun: npaj ua kom tawv nqaij
Humectants:
Adjective: khaws lossis khaws cia dej
Noun: ib yam khoom, tshwj xeeb tshaj yog cov tshuaj pleev ib ce los yog khoom noj khoom haus ntxiv, siv los txo cov dej noo
Kev sib cuam tshuam nrog dej molecules:
Emollients yog cov roj hydrophobic, lubricants, lipids thiab sterols thiab lawv tsis tuaj yeem tsim kev sib raug zoo nrog dej. Lawv yuav ua raws li kev thaiv thiab txo evaporation ntawm dej molecules.
Humectants yog cov molecules nrog ntau pawg hydrophilic xws li hydroxyl pawg, amines, thiab carboxyl pawg thiab cov pab pawg no tuaj yeem tsim cov hydrogen bonds nrog cov dej molecules.
Qhov tseem ceeb hauv kev lag luam tshuaj pleev ib ce thiab tshuaj:
Emollients ua haujlwm los ntawm kev tsim cov yeeb yaj kiab nyias ntawm daim tawv nqaij kom tsis txhob poob dej. Yog li, emollients inhibit thiab kho cov tawv nqaij qhuav, tiv thaiv cov tawv nqaij rhiab, txhim kho cov tawv nqaij thiab kev ntxhib los mos, thiab daim npog qhov ncauj tsis zoo. Lawv feem ntau muaj nyob rau hauv cov khoom lag luam thiab tshuaj.
Humectants nyiam dej vapor los ntawm huab cua kom moisturize ntawm daim tawv nqaij. Ntxiv rau qhov ntawd, ob qho tib si hauv kev lag luam tshuaj thiab tshuaj pleev ib ce, cov tshuaj humectants tuaj yeem siv rau hauv cov ntaub ntawv niaj hnub siv los txhim kho cov solubility ntawm cov tshuaj lom neeg cov khoom xyaw ua ke nrog rau kev txhim kho cov khoom xyaw nquag muaj peev xwm nkag mus rau ntawm daim tawv nqaij, thiab / lossis nws lub sijhawm ua haujlwm. Cov cuab yeej hydrating no tseem tuaj yeem xav tau los tiv thaiv cov khoom ua kom lub cev qhuav dej xws li xab npum. Yog li, cov tshuaj humectants yog cov ntsiab lus nyob rau hauv ntau yam khoom siv tshuaj pleev ib ce thiab tu tus kheej xws li cov plaub hau txias, tshuaj pleev lub cev, lub ntsej muag lossis lub cev ntxuav, di ncauj balms, eye cream thiab lwm yam.
Kev siv khoom noj thiab haus luam yeeb:
Emollients: Emollients tsis tshua muaj / tsis siv hauv kev lag luam zaub mov thiab luam yeeb.
Humectants: Zib ntab thiab kua qab zib yog qee yam humectants siv hauv cov khoom noj vim lawv nqus dej thiab qab zib. Lawv paub tias yog cov khoom noj khoom haus zoo vim tias lawv tuaj yeem ua rau muaj txiaj ntsig zoo, tswj cov viscosity thiab kev ntxhib los mos, khaws cov dej noo, txo cov dej ua haujlwm, thiab ua haujlwm tseem ceeb ntawm kev txhim kho softness. Thaum kawg, humectants ntxiv cov zaub mov tsis tshua muaj kev cuam tshuam rau microbial spoilage thiab biochemical hloov pauv thiab yog li, cov zaub mov tuaj yeem khaws cia rau lub sijhawm ntev dua lossis ua kom lub neej txee. Humectants yog siv nyob rau hauv kev tsim luam yeeb, e-luam yeeb, thiab nws tus kheej dov cov khoom luam yeeb. Lawv tau siv los khaws cov dej noo ntawm cov ntawv txiav luam yeeb thiab txhim kho tsw.
Examples:
Emollients: lipids thiab sterols, nrog rau cov roj hluavtaws lossis ntuj thiab roj nplua nyeem
Humectants: Quillaia, Urea, Aloe vera gel, MP diol, Alpha hydroxy acids xws li lactic acid, zib ntab, lithium Chloride, propylene glycol, hexylene glycol, thiab butylene glycol, Glyceryl triacetate, Neoagarobiose, qab zib cawv (sugar alcohols) polyols) xws li glycerol, sorbitol, xylitol, m altitol, Polymeric polyols xws li polydextrose
Nyob rau hauv xaus, ob qho tib si emollients thiab humectants yog khaws cia cov dej noo sib xyaw uas feem ntau yog los ntawm cov tshuaj ntuj los yog hluavtaws los tiv thaiv cov tawv nqaij los ntawm lub cev qhuav dej nrog rau kev pab kom softening lossis soothing ntawm daim tawv nqaij. Txawm li cas los xij, lawv cov txheej txheem ntawm kev ua haujlwm yog qhov sib txawv ntawm ib leeg vim tias cov tshuaj humectants tuaj yeem nqus dej noo los ntawm huab cua whereas emollients tuaj yeem txhim kho daim tawv nqaij cov dej noo.
