Focus on Cellulose ethers

Hydroxypropyl methylcellulose HPMC

Hydroxypropyl Methyl Cellulose HPMC

Hydroxypropyl methylcellulose(HPMC) waa derivative cellulose oo caadi ahaan loo isticmaalo warshado kala duwan, oo ay ku jiraan dawooyinka, cuntada, dhismaha, iyo daryeelka shakhsi ahaaneed. Waxaa lagu sameeyaa iyadoo si kiimiko ah wax looga beddelayo cellulose iyada oo loo marayo etherification, taas oo ku lug leh soo bandhigida kooxaha hydroxypropyl iyo methyl molecule cellulose.

HPMC waa budo aan ur lahayn oo caddaan iyo caddaan ah oo ku milmay biyaha waxayna samaysaa xal cad oo muuqda. Waxay leedahay hanti kala duwan oo ka dhigaysa mid faa'iido u leh codsiyada kala duwan. Tusaale ahaan, waa dhumuye, xasiliye, iyo emulsifier ee alaabta cuntada. Dhismaha, waxa loo isticmaalaa sida wakiilka biyaha-haynta ee sibidhka iyo hoobiye si loo hagaajiyo shaqada loogana hortago dildilaaca. Alaabooyinka daryeelka shakhsi ahaaneed, waxaa loo isticmaalaa dhumuc iyo emulsifier ee looshannada, kiriimyada, iyo alaabada kale.

Daawooyinka, HPMC waxa loo isticmaalaa sidii xidhe, kala daadsan, iyo wakiilka siidaynta la kantaroolo ee kiniiniyada iyo kaabsalka. Waxa kale oo loo istcimaalaa sidii wakiil hakin ah oo lagu sameeyo qaabaynta dareeraha iyo saliid ahaan boomaatada iyo kiriimyada. HPMC waa qayb si weyn loo aqbalay warshadaha dawooyinka sababtoo ah laqabsigeeda, badbaadada, iyo suntan hoose.

HPMC waxa ay leedahay darajooyin kala duwan oo leh heerar viscosity oo kala duwan, kuwaas oo lagu asteeyay kood lambareed. Mar kasta oo nambarku uu sarreeyo, waa uu sarreeyaa viscosity-ku. Heerarka HPMC waxay u dhexeeyaan mawjadaha hoose (5 cps) ilaa mawjadaha sare (100,000 cps). Viscosity-ka HPMC waa arrin muhiim u ah go'aaminta hantideeda iyo codsiyadeeda.

Isticmaalka HPMC ee dawooyinka ayaa koray sannadihii u dambeeyay sababo la xidhiidha sifooyin badan oo kala duwan iyo baahida sii kordheysa ee hababka bixinta dawooyinka cusub. Hydrogels-ku-saleysan HPMC ayaa loo adeegsaday hababka gaarsiinta daroogada sababtuna tahay noole ku habboonaantooda, sii-deyntooda la kantaroolay, iyo sifooyinkooda xuubka-dhejinta. Kiniinada HPMC ku salaysan ayaa sidoo kale lagu sameeyay sifooyin wax laga beddelay kuwaas oo u oggolaanaya gaarsiinta daroogada la beegsaday iyo u hoggaansanaanta bukaanka oo la hagaajiyay.

Si kastaba ha ahaatee, HPMC maaha mid aan xaddidnayn. Waxay leedahay milmayn liidata ee dareerayaasha organic waxayna xasaasi u tahay isbeddelada pH. Intaa waxaa dheer, waxay leedahay heerkul xaddidan waxayna lumin kartaa viscosity-keeda heerkulka sare. Xaddidaadahani waxay horseedeen horumarinta walxaha kale ee cellulose, sida hydroxyethyl cellulose (HEC) iyo carboxymethyl cellulose (CMC), kuwaas oo hagaajiyay guryaha iyo kala duwanaanshaha codsiga ballaaran.

Gebagebadii, HPMC waa derivative cellulose badan oo si weyn looga isticmaalo warshadaha kala duwan, gaar ahaan daawooyinka. Sifooyinkeeda gaarka ah, oo ay ku jiraan laqabsigeeda noole, badbaadada, iyo sunta hoose, waxay ka dhigtaa mid caan ku ah habaynta daroogada. Nidaamyada gudbinta dawooyinka ee ku salaysan HPMC ayaa muujiyay ballan lagu hagaajinayo waxtarka daawada iyo u hoggaansanaanta bukaanka. Si kastaba ha ahaatee, xaddidaadda ay ku leedahay milanka iyo dareenka pH ayaa horseeday horumarinta walxaha kale ee cellulose oo leh hanti la hagaajiyay.


Waqtiga boostada: Febraayo-13-2023
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