Yintoni iHydroxypropyl Methylcellulose (HPMC)?

IHydroxypropyl Methylcellulose (HPMC)yi-non-ionic cellulose ether eyenziwe ngezinto ze-polymer zendalo - umqhaphu ocoliweyo okanye i-pulp yomthi ngonyango lwe-alkali kunye nothotho lotshintsho lwempendulo yeekhemikhali. I-HPMC inokunyibilika kakuhle, uzinzo lobushushu kunye neempawu zokwenza ifilimu. Yinto ebalulekileyo yekhemikhali eluhlaza enoluhlu olubanzi lokusetyenziswa. Isetyenziswa kakhulu kulwakhiwo, amayeza, ukutya, izinto zokuthambisa kunye neminye imimandla.

1. Ulwakhiwo lweekhemikhali kunye neempawu ezisisiseko

Eyona nto iphambili kwi-HPMC kukuba amanye amaqela e-hydroxyl kwi-molecule ye-cellulose athathelwa indawo yi-methyl (–CH₃) kunye ne-hydroxypropyl (–CH₂CHOHCH₃), ngaloo ndlela kwakheka i-cellulose ether eguquliweyo. Ngenxa yokubakho kwamaqela e-hydrophilic kunye ne-hydrophobic kwisakhiwo sayo se-molecular, inomsebenzi ogqwesileyo womphezulu kunye neempawu zokwenza ifilimu.

I-HPMC yipowder okanye igranule emhlophe okanye engemhlophe kangako, ayinavumba kwaye ayinancasa, kwaye inokunyibilika emanzini abandayo ukuze yenze isisombululo se-colloidal esicacileyo okanye esinamafu kancinci. Ayinyibiliki emanzini ashushu, i-ethanol, i-chloroform kunye ne-ether, kodwa iyanyibilika kwezinye izinyibilikisi ze-organic ezixutyiweyo (ezifana ne-methanol/amanzi, izisombululo ze-ethanol/amanzi ezixutyiweyo).

Iimpawu zomzimba ze-HPMC ziquka

Uxinano olubonakalayo: malunga ne-0.3 ~ 0.5 g/cm³;

uzinzo lwe-pH: i-pH yesisombululo samanzi izinzile phakathi kwe-3 ~ 11;

I-Thermogelation: Isisombululo se-HPMC sineempawu ze-thermogelation. Xa sishushubezwa kubushushu obuthile, siya kutshintsha isigaba ukuze senze ijeli, size sibuyele kwimeko yesisombululo emva kokuba sipholile;

Umsebenzi womphezulu: Ineempawu ezilungileyo zokuxuba, ukusasazwa kunye nokugcinwa kwamanzi;

Ukubola: Ngenxa yokuba yenziwe ngokwendalo kwaye ayinatyhefu, inobuhlobo nokusingqongileyo kwaye iyabola.

2. Inkqubo yemveliso

I-HPMC idla ngokwenziwa nge-cellulose yendalo ngokusebenzisa le nkqubo ilandelayo:

I-Alkalinization reaction: Nyanga i-cotton ecociweyo okanye i-pulp yomthi phantsi kweemeko ze-alkaline ukuze uphule uthotho lweemolekyuli ze-cellulose kwaye wonyuse umsebenzi we-reaction;

Impendulo ye-etherification: Isabela kwi-methyl chloride kunye ne-propylene oxide phantsi kweemeko ezifanelekileyo zobushushu kunye noxinzelelo ukuze kungeniswe amaqela e-methyl kunye ne-hydroxypropyl;

Ukungathinteli, ukuhlamba nokomisa: Susa iimveliso ezishiyekileyo kunye nezinto ezingaphendulwanga, uze uzomise zibe ziimveliso ezigqityiweyo;

Ukutyumza nokucoca: Cwilisa imveliso eyomileyo ibe bubungakanani obufunekayo besuntswana uze uyipakishe imveliso egqityiweyo.

3. Iindawo eziphambili zokusetyenziswa

3.1. Ishishini lokwakha

I-HPMC isetyenziswa kakhulu kushishino lokwakha, isetyenziswa kakhulu kwidaka elixutywe nodaka, izincamathelisi zethayile, iimveliso zegypsum, udaka lokufudumala, umgangatho ozimeleyo kunye nezinye iimveliso, kunye nemisebenzi elandelayo:

Ukugcinwa kwamanzi okuqinileyo ukuthintela ukulahleka kwamanzi ngaphambi kwexesha kwesamente;

Ukuphucula ukunamathela kunye nokuphucula ukusebenza kolwakhiwo;

Ukuphucula ukusebenza kolwakhiwo kunye nokusebenza okuchasene nokuwa;

Lawula ixesha lokuseta kunye nokugeleza kodaka lwesamente.

3.2. Ishishini leMithi

I-HPMC isetyenziswa njengeqokobhe lekhaphu, iglu yethebhulethi, izinto ezikhutshwa rhoqo, i-emulsifier, njl.njl. kumalungiselelo amayeza. Sisithako esiqhelekileyo samayeza esineempawu ezilandelayo:

Ayinatyhefu, ayicaphukisi, kwaye ingathathwa ngomlomo;

Ipropati elungileyo yokwenza ifilimu, enokusetyenziswa ukulawula izinga lokukhululwa kwamayeza;

Ingasetyenziswa njengezinto eziluhlaza kwiikhaphu zemifuno ukuze kuthathelwe indawo igelatin;

Iimpawu zeThermogel zifanelekile ekukhutshweni okulawulwayo kwamayeza ashushu.

3.3. Ishishini lokutya

Xa kusetyenzwa ukutya, i-HPMC isetyenziswa kakhulu njenge-emulsifier, i-thickener, i-stabilizer, i-adhesive, njl. Umzekelo:

Njengesixhobo sokugcina amanzi kunye nokuphucula iimveliso ezibhakiweyo;

Ukuphucula incasa kunye nokusebenza kokumiswa kweziselo;

Njengesixhobo sokugcina amanzi kunye nokuphucula izicubu kwiimveliso zenyama;

Isetyenziselwa ukuthatha indawo yeeoyile kunye namafutha ekutyeni okunamafutha aphantsi ukuze kufezekiswe ukulinganisa incasa.

3.4. Izinto zokuthambisa kunye neemveliso zeekhemikhali zemihla ngemihla

I-HPMC isetyenziswa kakhulu kwiimveliso zokhathalelo lolusu, ishampu, i-toothpaste, isicoci sobuso, njl.njl., kwaye idlala le ndima ilandelayo:

Iinkqubo ze-emulsion zokuqina nokuzinzisa;

Ukuphucula ukusasazeka nokuphucula ukugudiswa kweemveliso;

Ukwenziwa kwefilimu nokubonelela ngemiphumo yokufumisa;

Ingasetyenziselwa ukulungiselela iijeli okanye iiemulsions ezibonakalayo.

3.5. Amanye amashishini

Ishishini lokugquma: lisetyenziswa njengesixhobo sokutyebisa kunye nesisasazisi kwiingubo ezisekelwe emanzini;

Ezolimo: zisetyenziswa njengesithwali esikhupha kancinci kwizinambuzane kunye nezichumisi;

Ishishini lokuprinta: lisetyenziswa njenge-glue kunye ne-thickener kwi-inki zokuprinta;

Iiceramics kunye nezinto zokwakha: zisetyenziswa njengesincamathelisi kunye neplastiki kwinkqubo yokubumba.

4. Ukhuseleko kunye nokukhuselwa kwendalo

I-HPMC ivela kwimicu yezityalo zendalo kwaye iyakwazi ukuhambelana kakuhle nendalo kwaye iyabola. Ayinabungozi kwaye ayinabungozi emzimbeni womntu xa isetyenziswa ngaphakathi koluhlu olufanelekileyo lwedosi, kwaye ihlangabezana nemigangatho yokhuseleko yokutya kunye nezongezo zamachiza. Ayingcolisi okusingqongileyo, inokonakala phantsi kweemeko zendalo, kwaye ayizukubangela umthwalo onzima okusingqongileyo.

I-Hydroxypropyl methylcellulose (HPMC), njenge-cellulose ether esebenza kakuhle kwaye isetyenziswa ngokubanzi, sisongezelelo esibalulekileyo kwimisebenzi emininzi kushishino lwanamhlanje. Ngenxa yeempawu zayo ezilungileyo zomzimba nezekhemikhali, ukhuseleko kunye nokhuseleko lokusingqongileyo, i-HPMC iyaqhubeka nokudlala indima ebalulekileyo kwiinkalo ezininzi. Ngokuphucuka kwekhemistri eluhlaza kunye neengcinga zophuhliso oluzinzileyo,intsimi yesicelo se-HPMC iya kuqhubeka nokwanda, kwaye amathuba ophuhliso lwayo abanzi.