Zeziphi izixhobo ezingafunekiyo ze-HPMC?

I-HydroxyPOpyl Methylcelcelsele (i-HPMC) yi-polymer eguquguqukayo ngoluhlu olubanzi lwezicelo kumashishini ahlukeneyo, kubandakanya amayeza, ukwakhiwa, ukutya, kunye ne-cosmetics. Izinto ezingafunekiyo ezisetyenziselwa ukuveliswa kwe-HPMC zivela kwizibonelelo zendalo nezivuselelekileyo.

I-HPMC yi-sessoynthetic ye-seluplose, i-polymer yendalo efumaneka kwiindonga zeseli zezityalo. Izinto ezingafunekiyo eziveliswa yi-HPMC ibandakanya isellulose kunye ne-propylene oxide. Izinto ezingafunekiyo kunye nenkqubo ye-synthesi ichazwe ngokweenkcukacha ngezantsi:

I-1. Iseli:

Umthombo: Izixhobo eziphambili ze-HPMC yi-sellyulose, ekhutshwe kwi-pulp yenkuni okanye i-cotton fiber. IPulp yeWood yeyona mthombo uqhelekileyo ngenxa yentabalala yayo kunye nendleko.
Ukwahlula: ukwahlula setywe kwizinto ezingafunekiyo kusetyenziswa iinkqubo ezahlukeneyo zekhemikhali kunye noomatshini. I-Pulp yePulp inyangwa ngokufanelekileyo ukuba isuswe impiliso kwaye ikhuphe iintsinga zeselfowuni.

2. I-propylene oxide:

Umthombo: I-propylene oxide yinxalenye ebalulekileyo ye-HPMC ye-HPMC kwaye ifumaneka kwi-propleyne, ipetrochemical ifunyenwe ngexesha lokucoca ioyile yeoyile ekrakra.
Imveliso: I-propylene oxide iveliswa ngenkqubo yemichiza ebizwa ngokuba yi-chlorohyddrins okanye i-epoxidation. Kule nkqubo, i-propylene iphendula nge-chlorine okanye i-hydrogen peroxide ukuba yenze i-proplenene oxide.

I-3. Ukuphendula kweMethyy:

Isiseko: I-Synthesis ye-HPMC ibandakanya ukwenziwa kwe-ether i-seluplose nge-propylene oxide. Le nkqubo ikwabizwa ngokuba yi-metyey, apho amaqela e-hydroxypropy aziswa kwi-selsebone.
Unyango lwe-Alkali: Ukunyanga isellulose nge-alkali (ihlala i-Sodium hydroxide) ukwenza amaqela e-hydroxyl. Oku kubenza basebenze ngakumbi ngexesha lokuphendula okulandelayo nge-propylene oxide.

4. Inqanaba le-methylid:

Ulawulo: Lawula inqanaba le-methylid (DS) ngexesha lokusabela ukufezekisa iipropathi eziyifunayo ze-HPMC. Inqanaba lokufaka endaweni ichaphazela ukuluka, ukugcinwa kwalo, kunye nezinye iipropathi zemveliso yokugqibela.
I-HYDROXYPOROPIROPR:

Ukuphendula: Iseli evulekileyo yenzekile nge-propylene oxide iphantsi kweemeko ezilawulwayo. Oku kukhokelela ekufakweni kweqela le-hydroxypropy kwikhonkco leselselose.
Iqondo lobushushu kunye noxinzelelo: Ukulawulwa kweemeko zokuphendula ngononophelo, kubandakanya amaqondo obushushu kunye noxinzelelo, ukuqinisekisa ukusebenza kakuhle kunye nokuphela kwemveliso.

I-5. Ukungathathi cala kunye nokuhlamba:

Ukungathathi cala kwezopolitiko: Emva kokuphendula, imveliso ayithathi cala nge-acid ukuba isuse ngaphezulu.
Ukuhlamba: i-HPMC ihlanjululwe ukususa ukungafezeki, izinto ezingasebenziyo kunye neemveliso. Eli nyathelo libalulekile ukufumana imveliso yokugqibela ecocekileyo.

6. Ukomisa:

Ukususwa kwamanzi: Inyathelo lokugqibela lomisa i-HPMC ukususa nawuphi na umswakama osele. Le fom i-HPMC kwiFomu yePowder, enokuqhubekeka nokusetyenziswa kwizicelo ezahlukeneyo.

Izinto ezingafunekiyo ze-HPMC ikakhulu zibandakanya isellulose ethathwe kwi-Pulp Pulp okanye i-Cotton Fiber kunye ne-proplene oxide esuka kwi-Petrochemical Proplemical proplene. Inkqubo ye-Synthesis ibandakanya i-methyling, i-hydroxyyprocy, ihlambiso, ukuhlamba kunye nokomisa, kwaye iimeko zokuphendula zilawulwa ngononophelo ukufumana i-polymer ye-polymer. I-HPMMC yokuguquguquka kwe-HPMC ukusuka kwisakhiwo sayo esahlukileyo, sisenza isithako esixabisekileyo kwiimveliso ezahlukeneyo.