Hydroxyethyl Cellulose (HEC) yog cov polymer uas tsis yaj hauv dej uas siv dav hauv kev pleev xim, tshuaj pleev ib ce, tshuaj, khoom noj, ntawv, roj av thiab lwm yam kev lag luam. Nws yog cov cellulose ether compound tau los ntawm etherification ntawm cellulose, uas hydroxyethyl hloov ib feem ntawm cov hydroxyl pawg ntawm cellulose. Cov khoom siv lub cev thiab tshuaj ntawm hydroxyethyl cellulose ua rau nws yog ib qho ntawm cov khoom tseem ceeb ntawm cov thickeners, gelling agents, emulsifiers thiab stabilizers.
Lub ntsiab lus kub ntawm hydroxyethyl cellulose
Hydroxyethyl cellulose yog ib qho polymer molecular siab nrog lub cev hnyav molecular loj, thiab nws qhov kub tshwj xeeb tsis yooj yim txiav txim siab zoo li cov khoom me me molecular. Hauv kev siv ua haujlwm, cov khoom siv molecular siab xws li hydroxyethyl cellulose tsis muaj qhov kub thiab txias meej. Qhov laj thawj yog tias cov tshuaj no yuav lwj thaum lub sijhawm cua sov, es tsis yog hloov pauv ncaj qha los ntawm kua mus rau roj los ntawm kev hloov pauv theem zoo li cov khoom me me molecular. Yog li ntawd, lub tswv yim ntawm "kub thiab txias" ntawm hydroxyethyl cellulose tsis siv tau.
Feem ntau, thaum hydroxyethyl cellulose raug cua sov ntawm qhov kub siab, nws yuav yaj ua ntej hauv dej lossis cov kuab tshuaj organic los tsim cov tshuaj colloidal, thiab tom qab ntawd ntawm qhov kub siab dua, cov saw polymer yuav pib tawg thiab thaum kawg thermally decompose, tso cov molecules me me xws li dej, carbon dioxide thiab lwm yam khoom volatile yam tsis tau dhau los ntawm cov txheej txheem boiling ib txwm muaj. Yog li ntawd, hydroxyethyl cellulose tsis muaj qhov kub npau npau meej, tab sis qhov kub thiab txias decomposition, uas sib txawv nrog nws qhov hnyav molecular thiab qib ntawm kev hloov pauv. Feem ntau hais lus, qhov kub thiab txias decomposition ntawm hydroxyethyl cellulose feem ntau yog siab dua 200 ° C.
Kev ruaj khov ntawm hydroxyethyl cellulose
Hydroxyethyl cellulose muaj kev ruaj khov tshuaj zoo ntawm chav tsev kub, tuaj yeem tiv taus qee qhov acid thiab alkali ib puag ncig, thiab muaj qee qhov tiv taus cua sov. Txawm li cas los xij, thaum qhov kub siab dhau, tshwj xeeb tshaj yog thaum tsis muaj cov kuab tshuaj lossis lwm yam stabilizers, cov saw polymer yuav pib tawg vim yog qhov ua haujlwm ntawm cua sov. Cov txheej txheem thermal decomposition no tsis yog nrog los ntawm kev npau npau, tab sis yog maj mam tawg thiab dehydration reaction, tso tawm cov tshuaj volatile thiab thaum kawg tawm hauv cov khoom carbonized.
Hauv kev siv hauv kev lag luam, txhawm rau kom tsis txhob muaj kev lwj los ntawm qhov kub siab, hydroxyethyl cellulose feem ntau tsis raug rau qhov chaw ib puag ncig tshaj qhov kub lwj. Txawm tias nyob rau hauv kev siv kub siab (xws li kev siv cov kua dej drilling hauv thaj chaw roj), hydroxyethyl cellulose feem ntau siv ua ke nrog lwm cov ntaub ntawv los txhim kho nws qhov kev ruaj khov thermal.
Daim ntawv thov ntawm hydroxyethyl cellulose
Txawm hais tias hydroxyethyl cellulose tsis muaj qhov kub thiab txias meej, nws cov khoom solubility thiab thickening ua rau nws siv dav hauv ntau yam lag luam. Piv txwv li:
Kev lag luam txheej: hydroxyethyl cellulose tuaj yeem siv ua cov khoom tuab los pab kho qhov rheology ntawm txheej, tiv thaiv kom tsis txhob muaj nag thiab txhim kho qhov leveling thiab stability ntawm txheej.
Cov tshuaj pleev ib ce thiab cov tshuaj siv niaj hnub: Nws yog ib qho khoom xyaw tseem ceeb hauv ntau cov tshuaj ntxuav tes, cov khoom tu tawv nqaij, tshuaj zawv plaub hau thiab cov tshuaj txhuam hniav, uas tuaj yeem muab cov khoom kom zoo, noo noo thiab ruaj khov.
Kev lag luam tshuaj: Hauv kev npaj tshuaj, hydroxyethyl cellulose feem ntau siv rau hauv kev tsim cov ntsiav tshuaj thiab cov txheej txheem tso tawm kom ruaj khov los tswj cov nqi tso tawm ntawm cov tshuaj.
Kev lag luam zaub mov: Ua ib qho thickener, stabilizer thiab emulsifier, hydroxyethyl cellulose kuj tseem siv rau hauv cov zaub mov, tshwj xeeb tshaj yog hauv ice cream, jelly thiab kua ntses.
Kev khawb roj: Hauv kev khawb roj, hydroxyethyl cellulose yog ib qho tseem ceeb ntawm cov kua dej khawb, uas tuaj yeem ua rau cov kua viscosity nce ntxiv, ua kom lub qhov dej ruaj khov thiab txo cov av nkos poob.
Ua ib yam khoom siv polymer, hydroxyethyl cellulose tsis muaj qhov kub thiab txias meej vim nws lwj thaum kub siab es tsis yog qhov kub thiab txias ib txwm muaj. Nws qhov kub thiab txias ntawm kev lwj thaum kub siab feem ntau yog siab dua 200 ° C, nyob ntawm nws qhov hnyav molecular thiab qib kev hloov pauv. Txawm li cas los xij, hydroxyethyl cellulose siv dav hauv cov txheej txheej, tshuaj pleev ib ce, tshuaj, khoom noj thiab roj av vim nws cov khoom ua kom tuab, gelling, emulsifying thiab stabilizing zoo heev. Hauv cov ntawv thov no, nws feem ntau zam kom tsis txhob raug rau qhov kub thiab txias ntau dhau kom ntseeg tau tias nws ua tau zoo thiab ruaj khov.
Lub sijhawm tshaj tawm: Lub Kaum Hli-23-2024