Cov yam ntxwv ntawm kev kub siab tshuab rau hydroxypropyl methylcellulose

Hydroxypropyl methylcellulose (HPMC)yog cov khoom siv tshuaj lom neeg tseem ceeb, dav siv hauv cov khoom siv hauv tsev, tshuaj, khoom noj thiab lwm yam. Tshwj xeeb tshaj yog nyob rau hauv kev tsim kho kev lag luam, HPMC tau dav siv vim nws cov kev ua tau zoo heev. Kev siv tshuab kub kub ua lub luag haujlwm tseem ceeb hauv kev tsim khoom thiab siv HPMC.

1. Lub luag haujlwm ntawm kev siv tshuab kub kub hauv HPMC

ProductionHydroxypropyl methylcellulose yog tau los ntawm cov tshuaj lom neeg xws li alkalization thiab etherification ntawm ntuj cellulose. Kev kub siab tshuab yog tsuas yog siv nyob rau hauv lub dissolution, ziab thiab molding theem ntawm cov tshuaj tiv thaiv txheej txheem. Kev kho kub kub tuaj yeem tsis tsuas yog ua kom cov tshuaj tiv thaiv kab mob, tab sis kuj txhim kho cov purity thiab stability ntawm cov khoom.

Txhim kho cov tshuaj tiv thaiv

Nyob rau hauv qhov kub thiab txias, cov tshuaj tiv thaiv ntawm cellulose thiab sodium hydroxide yog nrawm, 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 sib xws ntawm HPMC.

Tshem tawm impurities

Qhov kub thiab txias ib puag ncig tuaj yeem tshem tawm los ntawm cov khoom tsim tawm thaum lub sij hawm cov tshuaj tiv thaiv, xws li unreacted alkali tov thiab hnyav, thiab txhim kho lub purity ntawm HPMC.

Txhim kho kom qhuav efficiency

Thaum lub sij hawm high-temperature drying txheej txheem, cov dej noo ntawm HPMC evaporates sai sai, zam cov khoom los ntawm agglomerating los yog denaturing ntawm qhov kub thiab txias, thiab kev txhim kho cov stability thiab cia kev ua tau zoo ntawm cov khoom.

2. Qhov cuam tshuam ntawm high-temperature technology ntawm kev ua haujlwm ntawm HPMC

Kev siv tshuab kub kub tsis yog tsuas yog cuam tshuam rau lub cev qauv ntawm HPMC, tab sis kuj muaj kev cuam tshuam loj heev rau nws cov khoom siv tshuaj lom neeg thiab kev siv tshuaj.

Kev kho viscosity

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

Txhim khu kev ua kom sov

Lub thermal stability ntawm HPMC yog qhov zoo dua los ntawm kev kho qhov kub thiab txias. Nyob rau hauv lub tsev mortar thiab pobzeb adhesives, HPMC tseem muaj peev xwm tuav tau zoo adhesion thiab anti-sagging zog nyob rau hauv kub kub.

Txhim kho solubility

Thaum lub sij hawm high-temperature drying txheej txheem, lub microstructure ntawm HPMC yog optimized, ua nws ntau soluble nyob rau hauv dej txias. Tshwj xeeb tshaj yog nyob rau hauv ib puag ncig uas tsis tshua muaj kev tsim kho, HPMC tuaj yeem yaj sai sai thiab tsim cov tshuaj sib xyaw colloidal.

3. Kev thov tshwj xeeb ntawm kev siv tshuab kub kub hauv HPMC cov txheej txheem tsim khoom

Etherification cov tshuaj tiv thaiv theem

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

Qhuav thiab crushing theem

Lub tshuab ziab khaub ncaws kub saum 120 ° C tuaj yeem tsis tsuas yog tshem tawm cov dej noo, tab sis kuj tiv thaiv HPMC hmoov los ntawm agglomerating thaum lub sij hawm ziab. Tom qab ntawd, qhov kub siab crushing tshuab yog siv los ua HPMC hmoov cov khoom ntau dua thiab zoo ib yam, thiab cov dispersibility ntawm cov khoom yog txhim kho.

Kev kho kub kub curing

Thaum HPMC siv rau hauv cov khoom siv hauv tsev lossis cov txheej txheem, kev kho mob kub kub tuaj yeem txhim kho nws cov kab nrib pleb, sag tsis kam thiab dej tuav kev ua tau zoo, ua kom muaj txiaj ntsig zoo hauv cov cheeb tsam hnyav.

4. Qhov zoo ntawm kev siv tshuab kub kub hauv HPMC daim ntawv thov teb

Cov khoom siv hauv tsev

Nyob rau hauv ib puag ncig kub, HPMC qhia tau zoo heev thickening thiab dej tuav hauv mortar thiab putty hmoov, tiv thaiv mortar los ntawm lub cev qhuav dej sai thiab tawg.

Xim kev lag luam

HPMC synthesized los ntawm qhov kub thiab txias muaj qhov zoo leveling thiab anti-sagging teebmeem nyob rau hauv cov xim latex, uas txhim kho cov adhesion thiab hnav tsis kam ntawm txheej.

Kev lag luam kws tshuaj

Kev siv tshuab kub kub tuaj yeem txhim kho qhov sib xws ntawm HPMC hauv tshuaj txheej thiab ua kom muaj kev ruaj ntseg ntawm cov tshuaj tiv thaiv kev tso tawm.

Daim ntawv thov ntawm high temperature technology ntawmHydroxypropyl methylcellulose yog tsim los ntawm cov tshuajtsis tsuas yog txhim kho kev tsim khoom, tab sis kuj txhim kho cov khoom ua tau zoo. Los ntawm cov txheej txheem kub siab, viscosity, solubility thiab thermal stability ntawm HPMC tau ua kom zoo dua qub, ua rau nws muaj kev cia siab rau kev siv dav hauv kev tsim kho, txheej thiab tshuaj. Nyob rau hauv lub neej yav tom ntej, nrog kev nruam tshiab ntawm kev siv tshuab kub kub, kev ua haujlwm ntawm HPMC yuav raug txhim kho ntxiv, ua kom muaj txiaj ntsig ntau dua rau kev tsim cov khoom siv ntsuab thiab ib puag ncig.