Cov yam ntxwv ntawm kev siv tshuab kub siab rau hydroxypropyl methylcellulose

Hydroxypropyl methylcellulose (HPMC)yog ib yam khoom siv tshuaj tseem ceeb, siv dav hauv cov ntaub ntawv tsim kho, tshuaj, khoom noj thiab lwm yam teb. Tshwj xeeb tshaj yog hauv kev lag luam kev tsim kho, HPMC siv dav vim nws qhov kev ua tau zoo heev. Kev siv tshuab kub siab ua lub luag haujlwm tseem ceeb hauv kev tsim khoom thiab kev siv HPMC.

1. Lub luag haujlwm ntawm cov thev naus laus zis kub siab hauv HPMC

Kev tsim khoom Hydroxypropyl methylcellulose yog tau los ntawm ntau yam tshuaj lom neeg xws li alkalization thiab etherification ntawm cov cellulose ntuj. Cov thev naus laus zis kub siab feem ntau yog siv rau hauv cov theem yaj, ziab thiab molding ntawm cov txheej txheem tshuaj tiv thaiv. Kev kho kub siab tsis tsuas yog ua kom nrawm dua qhov kev ua haujlwm tshuaj tiv thaiv, tab sis kuj txhim kho qhov huv thiab ruaj khov ntawm cov khoom.

Kev ua haujlwm ntawm cov tshuaj tiv thaiv zoo dua

Nyob rau hauv qhov kub thiab txias siab, qhov kev hloov pauv ntawm cellulose thiab sodium hydroxide raug nrawm dua, uas txhawb nqa cov tshuaj hydroxypropyl thiab methyl hloov pauv hauv cov cellulose molecules, yog li txhim kho qib ntawm kev hloov pauv (DS) thiab kev sib xws ntawm HPMC.

Tshem tawm cov khoom tsis huv

Qhov chaw kub siab tuaj yeem tshem tawm cov khoom tsim tawm thaum lub sijhawm tshuaj tiv thaiv, xws li cov kua alkali tsis muaj zog thiab cov kuab tshuaj, thiab txhim kho qhov huv ntawm HPMC.

Kev ua kom qhuav zoo dua

Thaum lub sijhawm ziab kub siab, cov dej noo ntawm HPMC yuav qhuav sai sai, zam kom cov khoom tsis txhob sib sau ua ke lossis denaturing ntawm qhov kub qis, thiab txhim kho kev ruaj khov thiab kev khaws cia ntawm cov khoom.

2. Qhov cuam tshuam ntawm cov thev naus laus zis kub siab rau kev ua tau zoo ntawm HPMC

Kev siv tshuab kub siab tsis yog tsuas yog cuam tshuam rau cov qauv ntawm HPMC xwb, tab sis kuj muaj kev cuam tshuam loj heev rau nws cov khoom siv tshuaj lom neeg thiab cov teebmeem ntawm daim ntawv thov.

Kev kho qhov viscosity

Cov txheej txheem kub siab tuaj yeem tswj tau qhov hnyav molecular ntawm HPMC, yog li kho nws cov viscosity. Qhov kub siab dua pab txo qhov tshwm sim ntawm kev tawg ntawm cov saw hlau molecular, ua rau qhov viscosity ntawm HPMC hauv cov kua dej ruaj khov dua.

Kev tiv thaiv cua sov zoo dua

Qhov ruaj khov ntawm HPMC tau zoo dua los ntawm kev kho mob kub siab. Hauv kev tsim cov mortar thiab cov nplaum pobzeb, HPMC tseem tuaj yeem tswj tau qhov lo thiab tiv thaiv kev sagging hauv qab qhov kub siab.

Kev yaj zoo dua

Thaum lub sijhawm ziab kub siab, cov qauv me me ntawm HPMC tau zoo tshaj plaws, ua rau nws yaj tau ntau dua hauv dej txias. Tshwj xeeb tshaj yog nyob rau hauv qhov chaw tsim kho kub qis, HPMC tuaj yeem yaj sai thiab tsim cov tshuaj colloidal sib xws.

3. Kev siv tshuab kub siab tshwj xeeb hauv cov txheej txheem tsim khoom HPMC

Theem tshuaj tiv thaiv Etherification

Los ntawm kev ua cov tshuaj tiv thaiv etherification ntawm qhov kub siab ntawm 80-100 ° C, qhov kev hloov pauv ntawm hydroxypropyl thiab methyl pawg tuaj yeem ua kom nrawm dua, yog li HPMC muaj qib siab dua ntawm kev hloov pauv thiab ruaj khov zoo dua.

Theem ziab thiab zom

Cov txheej txheem ziab cua kub saum 120 ° C tsis yog tsuas yog tshem tawm cov dej noo xwb, tab sis kuj tseem tiv thaiv HPMC hmoov kom tsis txhob sib sau ua ke thaum lub sijhawm ziab. Tom qab ntawd, cov txheej txheem zom khoom kub siab siv los ua kom cov hmoov HPMC mos dua thiab sib xws, thiab kev sib kis ntawm cov khoom tau zoo dua.

Kev kho mob kub siab

Thaum HPMC siv rau hauv cov ntaub ntawv tsim kho lossis cov txheej txheem, kev kho kom sov siab tuaj yeem txhim kho nws qhov kev tiv thaiv tawg, kev tiv thaiv sag thiab kev ua haujlwm khaws cia dej, ua kom muaj txiaj ntsig zoo hauv kev tsim kho hauv qhov chaw nyuaj.

4. Cov txiaj ntsig ntawm kev siv tshuab kub siab hauv cov teb thov HPMC

Cov ntaub ntawv siv hauv tsev

Nyob rau hauv qhov kub thiab txias, HPMC qhia tau tias muaj cov tuab thiab khaws dej zoo heev hauv cov hmoov mortar thiab putty, tiv thaiv cov mortar kom tsis txhob qhuav sai thiab tawg.

Kev lag luam pleev xim

HPMC synthesized los ntawm qhov kub siab muaj cov teebmeem zoo thiab tiv thaiv kev sagging hauv cov xim latex, uas txhim kho qhov kev nplaum thiab kev hnav tsis kam ntawm cov txheej.

Kev lag luam tshuaj

Cov thev naus laus zis kub siab tuaj yeem txhim kho qhov sib xws ntawm HPMC hauv kev txheej tshuaj thiab xyuas kom meej tias cov tshuaj muaj kev ruaj khov.

Kev siv cov thev naus laus zis kub siab ntawmhydroxypropyl methylcellulosetsis yog tsuas yog txhim kho kev ua haujlwm ntau lawm xwb, tab sis kuj txhim kho kev ua haujlwm ntawm cov khoom. Los ntawm cov txheej txheem kub siab, qhov viscosity, solubility thiab thermal stability ntawm HPMC tau raug kho kom zoo dua, ua rau nws muaj kev cia siab dav dua hauv kev tsim kho, kev pleev xim thiab tshuaj. Yav tom ntej, nrog rau kev tsim kho tshiab tas mus li ntawm cov thev naus laus zis kub siab, kev ua tau zoo ntawm HPMC yuav raug txhim kho ntxiv, ua rau muaj kev pab ntau dua rau kev tsim cov khoom siv ntsuab thiab ib puag ncig zoo.