Umahluko phakathi kweHydroxypropyl Methylcellulose kunye neHydroxyethyl Cellulose

IHydroxypropyl Methylcellulose (HPMC) kwayeI-Hydroxyethyl Cellulose (HEC) zombini zizinto eziphuma kwi-cellulose, ezisetyenziswa kakhulu kushishino, kumayeza, kwizinto zokuthambisa nakwezinye iindawo. Umahluko wazo ophambili ubonakala kwisakhiwo se-molecular, kwiimpawu zokunyibilika, kwiindawo zokusetyenziswa nakwezinye iinkalo.

1. Ulwakhiwo lweemolekyuli

IHydroxypropyl Methylcellulose (HPMC)

I-HPMC sisixhobo esinyibilikayo emanzini esiveliswa ngokungenisa amaqela e-methyl (-CH3) kunye ne-hydroxypropyl (-CH2CHOHCH3) kwi-cellulose molecular chain. Ngokukodwa, ulwakhiwo lwe-molecular lwe-HPMC luneendawo ezimbini ezisebenzayo, i-methyl (-OCH3) kunye ne-hydroxypropyl (-OCH2CH(OH)CH3). Ngokwesiqhelo, umlinganiselo wokungeniswa kwe-methyl uphezulu, ngelixa i-hydroxypropyl inokuphucula ngempumelelo ukunyibilika kwe-cellulose.

I-Hydroxyethyl Cellulose (HEC)

I-HEC yi-derivative engeniswa ngokwazisa amaqela e-ethyl (-CH2CH2OH) kwi-cellulose molecular chain. Kwisakhiwo se-hydroxyethyl cellulose, iqela elinye okanye ngaphezulu le-hydroxyl (-OH) le-cellulose lithathelwa indawo ngamaqela e-ethyl hydroxyl (-CH2CH2OH). Ngokungafaniyo ne-HPMC, isakhiwo se-molecular se-HEC sinomnye kuphela othatha indawo ye-hydroxyethyl kwaye asinamaqela e-methyl.

2. Ukunyibilika kwamanzi

Ngenxa yokwahluka kwesakhiwo, ukunyibilika kwamanzi kwe-HPMC kunye ne-HEC kwahlukile.

I-HPMC: I-HPMC inokunyibilika kakuhle kwamanzi, ingakumbi xa ikwi-pH engathathi cala okanye ikwi-alkaline kancinci, ukunyibilika kwayo kungcono kune-HEC. Ukungeniswa kwamaqela e-methyl kunye ne-hydroxypropyl kuyayiphucula ukunyibilika kwayo kwaye kunokunyusa ukuxinana kwayo ngokusebenzisana neemolekyuli zamanzi.

I-HEC: I-HEC idla ngokunyibilika emanzini, kodwa ukunyibilika kwayo akuphucukanga, ingakumbi emanzini abandayo, kwaye idla ngokufuna ukunyibilika phantsi kweemeko zokufudumeza okanye ifuna ubuninzi obuphezulu ukuze kufezekiswe iziphumo ezifanayo ze-viscosity. Ukunyibilika kwayo kunxulumene nomahluko wesakhiwo se-cellulose kunye ne-hydroxyethyl philicity yeqela le-hydroxyethyl.

3. Iimpawu zokuqina kunye ne-rheological

I-HPMC: Ngenxa yokubakho kwamaqela amabini ahlukeneyo e-hydrophilic (i-methyl kunye ne-hydroxypropyl) kwiimolekyuli zayo, i-HPMC ineempawu ezilungileyo zokulungisa i-viscosity emanzini kwaye isetyenziswa kakhulu kwi-adhesives, ii-coating, ii-detergents, amalungiselelo amayeza nakwezinye iindawo. Kwimilinganiselo eyahlukeneyo, i-HPMC inokubonelela ngohlengahlengiso ukusuka kwi-viscosity ephantsi ukuya kwi-viscosity ephezulu, kwaye i-viscosity inovelwano ngakumbi kutshintsho lwe-pH.

I-HEC: I-viscosity ye-HEC ingalungiswa ngokutshintsha uxinzelelo, kodwa uluhlu lwayo lohlengahlengiso lwe-viscosity luncinci kunolo lwe-HPMC. I-HEC isetyenziswa kakhulu kwiimeko apho kufuneka i-viscosity ephantsi ukuya kwephakathi, ngakumbi kulwakhiwo, iisepha kunye neemveliso zokhathalelo lomntu. Iimpawu ze-rheological ze-HEC zizinzile, ngakumbi kwiindawo ezine-asidi okanye ezingathathi cala, i-HEC inokubonelela nge-viscosity ezinzileyo ngakumbi.

4. Amasimi esicelo

I-Hydroxypropyl methylcellulose (HPMC)

Ishishini lokwakha: I-HPMC isetyenziswa kakhulu kwi-samente mortar kunye neengubo kwishishini lokwakha ukuphucula ukuhamba kwamanzi, ukusebenza kakuhle kunye nokuthintela ukuqhekeka.

Ishishini lamayeza: Njengearhente yokulawula ukukhululwa kwamayeza, i-HPMC isetyenziswa kakhulu kwishishini lamayeza. Ayinakusetyenziswa nje kuphela njengearhente yokwenza iipilisi kunye neekhaphu, kodwa ikwasetyenziswa njenge-glue ukunceda ichiza likhutshwe ngokulinganayo.

Ishishini lokutya: I-HPMC idla ngokusetyenziswa ekulungisweni kokutya njengesiqinisi, isithambisi okanye i-emulsifier ukuphucula ubume kunye nencasa yokutya.

Ishishini lezinto zokuthambisa: Njengesithambisi-mafutha, i-HPMC isetyenziswa kakhulu kwiimveliso ezifana neekhrimu, iishampu, kunye nezithambisi-mafutha ukwandisa ukutyeba kunye nozinzo lweemveliso.

I-Hydroxyethyl cellulose (HEC)

Ishishini lokwakha: I-HEC idla ngokusetyenziswa kwisamente, i-gypsum, kunye nezincamathelisi zethayile ukuphucula ukutyibilika kunye nexesha lokugcina imveliso.

Abacoci: I-HEC idla ngokusetyenziswa kwizicoci zasekhaya, kwiisepha zokuhlamba impahla nakwezinye iimveliso ukwandisa uburhabaxa bemveliso nokuphucula isiphumo sokucoca.

Ishishini lezinto zokuthambisa: I-HEC isetyenziswa kakhulu kwiimveliso zokhathalelo lolusu, iijeli zokuhlamba, iishampu, njl.njl. njenge-thickener kunye ne-alamu yokuxhoma ukuphucula ubume kunye nozinzo lwemveliso.

Ukukhupha ioyile: I-HEC ingasetyenziswa nakwinkqubo yokukhupha ioyile njengesithambisi kulwelo lokugrumba olusekelwe emanzini ukunceda ukwandisa i-viscosity yolwelo kunye nokuphucula isiphumo sokugrumba.

5. Uzinzo lwe-pH

I-HPMC: I-HPMC inovelwano kakhulu kutshintsho lwe-pH. Phantsi kweemeko ze-asidi, ukunyibilika kwe-HPMC kuyancipha, nto leyo enokuchaphazela ukusebenza kwayo. Ke ngoko, idla ngokusetyenziswa kwindawo engathathi cala ukuya kweye-alkaline kancinci.

I-HEC: I-HEC ihlala izinzile kuluhlu olubanzi lwe-pH. Iyakwazi ukuziqhelanisa neemeko ze-acidic kunye ne-alkaline, ngoko ke isetyenziswa rhoqo kwiifomyula ezifuna uzinzo oluqinileyo.

I-HPMCkwayeI-HECzahlukile kwisakhiwo semolekyuli, ukunyibilika, ukusebenza kohlengahlengiso lwe-viscosity, kunye neendawo zokusetyenziswa. I-HPMC inamandla okunyibilika kwamanzi kunye nokusebenza kohlengahlengiso lwe-viscosity, kwaye ifanelekile kwizicelo ezifuna i-viscosity ephezulu okanye ukusebenza okukhutshiweyo okulawulwayo; ngelixa i-HEC inamandla e-pH kunye noluhlu olubanzi lwezicelo, kwaye ifanelekile kwizihlandlo ezifuna i-viscosity ephakathi nephantsi kunye nokuziqhelanisa okunamandla nokusingqongileyo. Kwizicelo zokwenyani, ukhetho lwezixhobo ekufuneka luvavanywe ngokusekelwe kwiimfuno ezithile.