Hydroxypropyl Methylcellulose (HPMC) yog dab tsi?

Hydroxypropyl Methylcellulose (HPMC)yog cov cellulose ether uas tsis yog ionic ua los ntawm cov khoom siv polymer ntuj - paj rwb zoo lossis ntoo pulp los ntawm kev kho alkali thiab ntau yam kev hloov pauv tshuaj lom neeg. HPMC muaj kev yaj zoo, kev ruaj khov thermal thiab cov khoom ua zaj duab xis. Nws yog cov khoom siv tshuaj lom neeg tseem ceeb nrog ntau yam kev siv. Nws yog siv dav hauv kev tsim kho, tshuaj, khoom noj, tshuaj pleev ib ce thiab lwm yam teb.

1. Cov qauv tshuaj lom neeg thiab cov khoom yooj yim

Lub ntsiab lus tseem ceeb ntawm HPMC yog tias qee pawg hydroxyl hauv cov cellulose molecule raug hloov los ntawm methyl (–CH₃) thiab hydroxypropyl (–CH₂CHOHCH₃), yog li tsim cov cellulose ether hloov kho. Vim yog qhov sib koom ua ke ntawm cov pab pawg hydrophilic thiab hydrophobic hauv nws cov qauv molecular, nws muaj cov haujlwm zoo heev ntawm qhov chaw thiab cov khoom tsim zaj duab xis.

HPMC yog hmoov dawb los yog hmoov av dawb, tsis muaj ntxhiab thiab tsis qab, thiab tuaj yeem yaj rau hauv dej txias kom ua rau cov kua colloidal pob tshab lossis me ntsis turbid. Nws tsis yaj rau hauv dej kub, ethanol, chloroform thiab ether, tab sis yaj rau hauv qee cov organic solvents sib xyaw (xws li methanol / dej, ethanol / dej sib xyaw cov tshuaj).

Cov khoom siv lub cev ntawm HPMC suav nrog

Qhov pom tseeb: li 0.3 ~ 0.5 g / cm³;

pH ruaj khov: pH ntawm cov kua dej ruaj khov ntawm 3 ~ 11;

Thermogelation: Cov tshuaj HPMC muaj cov khoom thermogelation. Thaum cua sov rau qee qhov kub, nws yuav hloov pauv theem los ua gel, thiab rov qab mus rau lub xeev tshuaj tom qab txias;

Kev ua haujlwm ntawm qhov chaw: Nws muaj cov khoom zoo emulsification, dispersion thiab water retention properties;

Kev puas tsuaj ntawm cov khoom: Vim tias nws yog los ntawm ntuj thiab tsis muaj tshuaj lom, nws yog tus phooj ywg rau ib puag ncig thiab biodegradable.

2. Cov txheej txheem tsim khoom

HPMC feem ntau yog ua los ntawm cov cellulose ntuj los ntawm cov txheej txheem hauv qab no:

Cov tshuaj tiv thaiv alkalinization: Kho cov paj rwb zoo lossis cov ntoo pulp hauv qab alkaline kom tawg cov saw hlau cellulose thiab ua kom cov tshuaj tiv thaiv ua haujlwm ntau ntxiv;

Kev sib xyaw ua ke ntawm etherification: Ua ke nrog methyl chloride thiab propylene oxide nyob rau hauv qhov kub thiab txias kom tsim nyog los tsim cov methyl thiab hydroxypropyl pawg;

Kev ua kom tsis muaj zog, ntxuav thiab ziab: Tshem tawm cov khoom seem thiab cov tshuaj tsis muaj zog, thiab ziab kom qhuav rau hauv cov khoom tiav;

Kev tsoo thiab kev tshuaj ntsuam: Zom cov khoom qhuav rau hauv qhov loj me uas xav tau thiab ntim cov khoom tiav.

3. Cov chaw thov tseem ceeb

3.1. Kev lag luam tsim kho

HPMC siv dav tshaj plaws hauv kev lag luam kev tsim kho, feem ntau yog siv rau hauv cov tshuaj sib xyaw qhuav, cov nplaum pobzeb, cov khoom gypsum, cov tshuaj rwb thaiv tsev thermal, pem teb tus kheej thiab lwm yam khoom, nrog rau cov haujlwm hauv qab no:

Muaj zog khaws dej kom tiv thaiv kom tsis txhob muaj dej poob ua ntej lub sijhawm;

Txhim kho kev nplaum thiab txhim kho kev ua haujlwm ntawm kev tsim kho;

Txhim kho kev ua tau zoo ntawm kev tsim kho thiab kev ua haujlwm tiv thaiv kev qaug zog;

Tswj lub sijhawm teeb tsa thiab fluidity ntawm cement mortar.

3.2. Kev Lag Luam Tshuaj

HPMC siv ua lub plhaub tshuaj ntsiav, nplaum ntsiav tshuaj, cov khoom siv tso tawm tas mus li, emulsifier, thiab lwm yam hauv kev npaj tshuaj. Nws yog ib qho tshuaj ntxiv nrog cov yam ntxwv hauv qab no:

Tsis muaj tshuaj lom, tsis ua rau khaus, thiab tuaj yeem noj tau los ntawm qhov ncauj;

Cov khoom zoo ua zaj duab xis, uas siv tau los tswj cov tshuaj tso tawm;

Siv tau ua cov khoom siv raw rau cov tshuaj ntsiav zaub mov los hloov gelatin;

Cov khoom siv thermogel yog qhov tsim nyog rau kev tswj hwm kev tso tawm ntawm cov tshuaj thermosensitive.

3.3. Kev Lag Luam Khoom Noj

Hauv kev ua zaub mov, HPMC feem ntau yog siv ua emulsifier, thickener, stabilizer, nplaum, thiab lwm yam. Piv txwv li:

Ua tus neeg sawv cev tuav dej thiab txhim kho cov khoom ci;

Txhim kho qhov saj thiab kev ua haujlwm ntawm cov dej haus;

Ua tus neeg sawv cev khaws dej thiab cov ntaub so ntswg zoo dua hauv cov khoom nqaij;

Siv los hloov cov roj thiab cov rog hauv cov khoom noj uas muaj roj tsawg kom ua tiav qhov saj zoo.

3.4. Cov tshuaj pleev ib ce thiab cov khoom siv tshuaj txhua hnub

HPMC siv dav hauv cov khoom siv tu tawv nqaij, tshuaj zawv plaub hau, tshuaj txhuam hniav, tshuaj ntxuav ntsej muag, thiab lwm yam, thiab ua lub luag haujlwm hauv qab no:

Cov txheej txheem emulsion tuab thiab ruaj khov;

Txhim kho kev sib kis thiab txhim kho qhov du ntawm cov khoom;

Kev tsim cov yeeb yaj kiab thiab muab cov teebmeem moisturizing;

Siv tau los npaj cov gels pob tshab lossis emulsions.

3.5. Lwm yam lag luam

Kev lag luam txheej: siv ua cov khoom siv tuab thiab cov khoom tawg rau cov txheej txheem dej;

Kev Ua Liaj Ua Teb: siv ua tus neeg nqa khoom qeeb hauv cov tshuaj tua kab thiab chiv;

Kev lag luam luam ntawv: siv ua cov nplaum thiab cov khoom ua kom tuab rau cov ntawv luam ntawv;

Cov khoom siv ua los ntawm av nplaum thiab cov khoom siv hauv tsev: siv ua cov nplaum thiab cov khoom yas hauv cov txheej txheem molding.

4. Kev nyab xeeb thiab kev tiv thaiv ib puag ncig

HPMC yog los ntawm cov nroj tsuag fibers ntuj thiab muaj kev sib raug zoo thiab biodegradability zoo. Nws tsis muaj tshuaj lom thiab tsis ua rau tib neeg lub cev tsis muaj teeb meem thaum siv rau hauv qhov ntau thiab tsawg tsim nyog, thiab ua tau raws li cov qauv kev nyab xeeb rau cov khoom noj thiab tshuaj ntxiv. Nws tsis ua rau ib puag ncig muaj kuab paug, tuaj yeem lwj hauv cov xwm txheej ntuj, thiab yuav tsis ua rau muaj kev puas tsuaj rau ib puag ncig.

Hydroxypropyl methylcellulose (HPMC), ua ib qho cellulose ether nrog kev ua tau zoo heev thiab kev siv dav, yog ib qho khoom siv ntau yam tseem ceeb hauv kev lag luam niaj hnub no. Nrog nws cov khoom zoo thiab tshuaj lom neeg, kev nyab xeeb thiab kev tiv thaiv ib puag ncig, HPMC txuas ntxiv ua lub luag haujlwm tseem ceeb hauv ntau qhov chaw. Nrog kev nce qib ntawm cov tshuaj ntsuab ntsuab thiab cov tswv yim kev txhim kho ruaj khov, lubdaim ntawv thov ntawm HPMC yuav txuas ntxiv nthuav dav, thiab nws txoj kev cia siab loj hlob yog dav.