Umahluko phakathi kweHydroxypropyl Methylcellulose kunye neHydroxyethyl Cellulose

IHydroxypropyl Methylcellulose (HPMC) kwayeIselulosi yeHydroxyethyl (HEC) Zombini ziphuma kwi-cellulose, zisetyenziswa kakhulu kushishino, amayeza, izinto zokuthambisa kunye nezinye iinkalo. Iiyantlukwano zabo eziphambili zibonakaliswa kwisakhiwo se-molecular, iimpawu ze-solubility, imimandla yesicelo kunye neminye imiba.

1. Ubume bemolekyuli

IHydroxypropyl Methylcellulose (HPMC)

I-HPMC yi-derivative e-soluble derivative eyaziswa ngokuzisa i-methyl (-CH3) kunye namaqela e-hydroxypropyl (-CH2CHOHCH3) kwi-cellulose molecular chain. Ngokukodwa, i-molecular structure ye-HPMC iqulethe izinto ezimbini ezisebenzayo, i-methyl (-OCH3) kunye ne-hydroxypropyl (-OCH2CH (OH) CH3). Ngokuqhelekileyo, umlinganiselo wokungeniswa kwe-methyl uphezulu, ngelixa i-hydroxypropyl inokuphucula ngokufanelekileyo ukunyibilika kweselulosi.

Iselulosi yeHydroxyethyl (HEC)

I-HEC yi-derivative eyaziswa ngokuzisa amaqela e-ethyl (-CH2CH2OH) kwi-cellulose molecular chain. Kwisakhiwo se-cellulose ye-hydroxyethyl, iqela elinye okanye ngaphezulu kwe-hydroxyl (-OH) ye-cellulose ithathelwa indawo ngamaqela e-ethyl hydroxyl (-CH2CH2OH). Ngokungafaniyo ne-HPMC, i-molecular structure ye-HEC ine-hydroxyethyl enye kuphela kwaye ayiqulathanga amaqela e-methyl.

2. Ukunyibilika kwamanzi

Ngenxa yokwahlukana kwesakhiwo, ukunyibilika kwamanzi kwe-HPMC kunye ne-HEC kuyahluka.

I-HPMC: I-HPMC inonyibiliko olulungileyo lwamanzi, ngakumbi kumaxabiso angathathi hlangothi okanye e-alkaline kancinane, ukunyibilika kwayo kubhetele kune-HEC. Ukuqaliswa kwamaqela e-methyl kunye ne-hydroxypropyl kwandisa ukunyibilika kwayo kwaye kunokwandisa i-viscosity yayo ngokusebenzisana neemolekyuli zamanzi.

I-HEC: I-HEC idla ngokunyibilika emanzini, kodwa ukunyibilika kwayo kuncinci, ngakumbi kumanzi abandayo, kwaye isoloko ifuna ukuchithwa phantsi kweemeko zokufudumeza okanye ifuna ukugxilwa okuphezulu ukufezekisa iziphumo ezifanayo ze-viscosity. I-solubility yayo ihambelana nokuhluka kwesakhiwo se-cellulose kunye ne-hydrophilicity yeqela le-hydroxyethyl.

3. I-Viscosity kunye neempawu ze-rheological

I-HPMC: Ngenxa yobukho bamaqela amabini ahlukeneyo e-hydrophilic (i-methyl kunye ne-hydroxypropyl) kwiimolekyuli zayo, i-HPMC ineempawu ezintle zokulungiswa kwe-viscosity emanzini kwaye isetyenziswa ngokubanzi kwi-adhesives, i-coatings, i-detergents, amalungiselelo amayeza kunye nezinye iindawo. Kwiindawo ezahlukeneyo, i-HPMC inokubonelela ngohlengahlengiso ukusuka kwi-viscosity ephantsi ukuya kwi-viscosity ephezulu, kwaye i-viscosity inomdla ngakumbi kwiinguqu ze-pH.

I-HEC: I-viscosity ye-HEC inokulungiswa ngokuguqula i-concentration, kodwa uluhlu lwayo lohlengahlengiso lwe-viscosity luncinci kunolo lwe-HPMC. I-HEC isetyenziswa kakhulu kwiimeko apho i-viscosity ephantsi ukuya ephakathi ifunekayo, ngakumbi kulwakhiwo, i-detergents kunye nemveliso yokunyamekela komntu. Iimpawu ze-rheological ze-HEC zizinzile, ngakumbi kwiindawo ezine-acidic okanye ezingathathi hlangothi, i-HEC inokubonelela nge-viscosity ezinzile.

4. Iinkalo zesicelo

IHydroxypropyl methylcellulose (HPMC)

Umzi-mveliso wokwakha: I-HPMC isetyenziswa ngokuqhelekileyo kudaka lwesamente kunye neengubo kushishino lokwakha ukuphucula ulwelo, ukusebenza kunye nokuthintela iintanda.

Umzi-mveliso wamachiza: Njenge-ejenti yokulawula ukukhutshwa kweziyobisi, i-HPMC isetyenziswa ngokubanzi kwishishini lamachiza. Ayinakusetyenziswa kuphela njenge-arhente yokwenza iipilisi kunye ne-capsules, kodwa njenge-adhesive ukunceda ukukhulula ichiza ngokulinganayo.

Umzi-mveliso wokutya: I-HPMC isoloko isetyenziswa ekulungisweni kokutya njengesizinzisi, isingqimba okanye i-emulsifier ukuphucula ukuthungwa kunye nencasa yokutya.

Umzi-mveliso wezithambiso: Njenge-thickener, i-HPMC isetyenziswa kakhulu kwiimveliso ezifana neekhrimu, iishampu, kunye ne-conditioners ukunyusa i-viscosity kunye nokuzinza kweemveliso.

Iselulosi yeHydroxyethyl (HEC)

Ishishini lokwakha: I-HEC isoloko isetyenziselwa i-samente, i-gypsum, kunye ne-adhesives ye-tile ukuphucula umbane kunye nokugcinwa kwexesha lemveliso.

Abacoci: I-HEC isoloko isetyenziselwa abacoci bendlu, i-detergents kunye nezinye iimveliso zokwandisa i-viscosity yemveliso kunye nokuphucula umphumo wokucoca.

Imboni yezimonyo: I-HEC isetyenziswa ngokubanzi kwiimveliso zokunakekelwa kwesikhumba, iigels zeshawa, i-shampoos, njl njl njenge-thickener kunye ne-ejenti yokumisa ukuphucula ukuthungwa kunye nokuzinza kwemveliso.

Ukutsalwa kwe-oyile: I-HEC ingasetyenziselwa kwinkqubo yokukhutshwa kweoli njenge-thickener kumanzi asekelwe emanzini okugaya ukunceda ukwandisa i-viscosity yolwelo kunye nokuphucula umphumo wokugaya.

5. ukuzinza kwe-pH

I-HPMC: I-HPMC inovelwano kakhulu kutshintsho lwe-pH. Ngaphantsi kweemeko ze-acidic, ukunyibilika kwe-HPMC kuncipha, okunokuthi kuchaphazele ukusebenza kwayo. Ke ngoko, iqhele ukusetyenziswa kwindawo engathathi hlangothi ukuya kwindawo ene-alkaline kancinane.

I-HEC: I-HEC ihlala izinzile kuluhlu olubanzi lwe-pH. Inokulungelelaniswa okunamandla kwiindawo ezine-acidic kunye ne-alkaline, ngoko ke isetyenziswa rhoqo kwiifom ezifuna ukuzinza okuqinileyo.

HPMCkwayeI-HECzihluke kwisakhiwo se-molecular, i-solubility, i-viscosity adjustment performance, kunye neendawo zokusetyenziswa. I-HPMC inokunyibilika kakuhle kwamanzi kunye nokusebenza kohlengahlengiso lwe-viscosity, kwaye ifanelekile kwizicelo ezifuna i-viscosity ephezulu okanye ukukhululwa okukhethekileyo okulawulwayo; ngelixa i-HEC inozinzo oluhle lwe-pH kunye noluhlu olubanzi lwezicelo, kwaye ifanelekile kwizihlandlo ezifuna i-viscosity ephakathi kunye nephantsi kunye nokuguquguquka okunamandla kokusingqongileyo. Kwizicelo ezichanekileyo, ukhetho lweziphi izinto ezifuna ukuvavanywa ngokusekelwe kwiimfuno ezithile.