Ukuhlelwa kweCellulose ether ihydroxyethyl cellulose kunye nehydroxypropyl methylcellulose

I-Cellulose ethers ziindidi zeepolymers ezinyibilikayo zamanzi ezivela kwi-cellulose, i-polymer yendalo efumaneka kwiindonga zeseli zezityalo.Ezi ether zineempawu ezizodwa ezifana nokutyeba, ukuzinzisa, ukwenza ifilimu, kunye nokugcinwa kwamanzi, kwaye zisetyenziswa ngokubanzi kumashishini ahlukeneyo afana namayeza, ukutya, izimonyo kunye nokwakhiwa.Phakathi kwe-cellulose ethers, i-hydroxyethyl cellulose (HEC) kunye ne-hydroxypropyl methylcellulose (HPMC) zimbini ezibalulekileyo eziphuma kuzo, nganye ineempawu ezahlukeneyo kunye nokusetyenziswa.

1. Intshayelelo ye-cellulose ethers

A. Ulwakhiwo lweCellulose kunye nezinto eziphuma kuzo

Isishwankathelo seselulosi:

I-Cellulose yi-polymer ehambelanayo eyenziwe ngeeyunithi ze-glucose ezidityaniswe ngamabhondi e-β-1,4-glycosidic.

Ityebile kwiindonga zeeseli zezityalo kwaye ibonelela ngenkxaso yesakhiwo kunye nokuqina kwizicubu zezityalo.

Izinto eziphuma kwi-cellulose ether:

I-cellulose ethers ithathwe kwi-cellulose ngokuguqulwa kweekhemikhali.

I-Ethers yaziswa ukwandisa ukunyibilika kunye nokuguqula iimpawu zokusebenza.

2. I-Hydroxyethylcellulose (HEC)

A. Isakhiwo kunye nokudibanisa

Ubume bekhemikhali:

I-HEC ifunyenwe nge-etherification ye-cellulose kunye ne-ethylene oxide.

Amaqela e-Hydroxyethyl athatha indawo yamaqela e-hydroxyl kwisakhiwo se-cellulose.

Isidanga sokutshintshwa (DS):

I-DS ibhekisa kwi-avareji yenani lamaqela e-hydroxyethyl ngeyunithi ye-anhydroglucose.

Ichaphazela i-solubility, viscosity kunye nezinye iimpawu ze-HEC.

B. Indalo

Ukunyibilika:

I-HEC iyanyibilika emanzini abandayo kunye nashushu, ibonelela ngokuguquguquka kwesicelo.

Viscosity:

Njengoko i-rheology modifier, ichaphazela ubukhulu kunye nokuhamba kwesisombululo.

Iyahluka nge-DS, ukugxila kunye nobushushu.

Ukwenziwa kwefilimu:

Yenza ifilimu ecacileyo kunye nokunamathela okugqwesileyo.

C. Isicelo

iyeza:

Isetyenziswa njenge-thickener kwiifom zedosi yolwelo.

Ukuphucula i-viscosity kunye nokuzinza kwamaconsi amehlo.

Iipeyinti kunye neeNqaku:

Iphucula i-viscosity kwaye ibonelela ngeempawu ezigqwesileyo zokujiya.

Ukuphucula ukunamathela kwepeyinti kunye nokuzinza.

Iimveliso zokhathalelo lomntu:

Ifunyenwe kwiishampu, iikhrimu kunye neloshini njenge-thickener kunye ne-stabilizer.

Ibonelela ngobume obugudileyo kwizinto zokuthambisa.

3. IHydroxypropylmethylcellulose (HPMC)

A. Isakhiwo kunye nokudibanisa

Ubume bekhemikhali:

I-HPMC idityaniswe ngokutshintshela amaqela e-hydroxyl kunye namaqela e-methoxy kunye ne-hydroxypropyl.

I-Etherification yenzeke ngokusabela ngepropylene oxide kunye ne-methyl chloride.

I-Methoxy kunye ne-hydroxypropyl endaweni:

Iqela le-methoxy ligalelo kwi-solubility, ngelixa iqela le-hydroxypropyl lichaphazela i-viscosity.

B. Indalo

I-Thermal Gelation:

Ibonisa i-gelation ye-thermal eguqulwayo, yenze i-gels kumaqondo aphezulu.

Ingasetyenziselwa ukukhutshwa okulawulwayo amalungiselelo amayeza.

Ugcino lwamanzi:

Umthamo ogqwesileyo wokugcinwa kwamanzi, okwenza ukuba alungele izicelo zokwakha.

Umsebenzi womphezulu:

Ibonisa iimpawu ezifana ne-surfactant ukunceda ukuzinzisa i-emulsions.

C. Isicelo

Ishishini lokwakha:

Isetyenziswa njengearhente yokugcina amanzi kudaka olusekwe kwisamente.

Ukuphucula ukusebenza kunye nokubambelela kwi-adhesives tile.

iyeza:

Ngokuqhelekileyo isetyenziswe ngomlomo kunye namalungiselelo amayeza onyango.

Iququzelela ukukhutshwa kwechiza elilawulwayo ngenxa yesakhono salo sokwenza ijeli.

ishishini lokutya:

Isebenza njenge-thickener kunye ne-stabilizer ekutyeni.

Ibonelela ngobume obuphuculweyo kunye ne-mouthfeel kwizicelo ezithile.

4. Uhlalutyo lokuthelekisa

A. Umahluko kwi-synthesis

I-HEC kunye ne-HPMC synthesis:

I-HEC iveliswa ngokuphendula i-cellulose nge-ethylene oxide.

Ukuhlanganiswa kwe-HPMC kubandakanya ukutshintshwa kabini kwe-methoxy kunye namaqela e-hydroxypropyl.

B. Ukwahluka kwentsebenzo

Ukunyibilika kunye neViscosity:

I-HEC iyanyibilika kumanzi abandayo nashushu, ngelixa i-solubility ye-HPMC ichaphazeleka ngumxholo weqela le-methoxy.

I-HEC ngokubanzi ibonisa i-viscosity ephantsi xa kuthelekiswa ne-HPMC.

Ukuziphatha kweGel:

Ngokungafaniyo ne-HPMC, eyenza iijeli ezibuyiselwa umva, i-HEC ayihambi nge-thermal gelation.

C. Umahluko kwisicelo

Ugcino lwamanzi:

I-HPMC ikhethwa kwizicelo zokwakha ngenxa yeempawu zayo ezibalaseleyo zokugcina amanzi.

Isakhono sokwenza ifilimu:

I-HEC yenza iifilimu ezicacileyo ngokubambelela kakuhle, okwenza ukuba zilungele izicelo ezithile apho ukubunjwa kwefilimu kubaluleke kakhulu.

5 Isiphelo

Isishwankathelo, i-hydroxyethyl cellulose (HEC) kunye ne-hydroxypropyl methylcellulose (HPMC) zibalulekile i-cellulose ethers ezineempawu ezizodwa kunye nokusetyenziswa.Izakhiwo zabo zeekhemikhali ezikhethekileyo, iindlela zokudibanisa, kunye neempawu ezisebenzayo zibenza basebenzise izinto ezininzi kumashishini ahlukeneyo.Ukuqonda umahluko phakathi kwe-HEC kunye ne-HPMC kunokukunceda wenze isigqibo esinolwazi xa ukhetha i-ether ye-cellulose efanelekileyo kwisicelo esithile, nokuba kumayeza, ukwakhiwa, iipeyinti okanye iimveliso zokunakekelwa komntu.Njengoko itekhnoloji ihambela phambili kwisayensi, uphando olongezelelekileyo lunokuveza usetyenziso olungakumbi kunye nohlengahlengiso, ngaloo ndlela luphucula ukusetyenziswa kwezi etha zeselulosi kwiinkalo ezahlukeneyo.