Ukulungiswa kunye neempawu ezibonakalayo ze-hydroxypropyl starch ether

I-Hydroxypropyl starch ether (HPStE) ilungiswa ngenkqubo yokuguqulwa kwemichiza ebandakanya ukwazisa amaqela e-hydroxypropyl kwi-molecule ye-starch. Indlela yokulungiselela idla ngokubandakanya la manyathelo alandelayo:

1. Ukukhethwa Kwesitatshi: Isitashi esikumgangatho ophezulu, oqhele ukuvela kwimithombo efana nombona, ingqolowa, iitapile, okanye i-tapioca, ikhethwa njengesixhobo sokuqala. Ukukhetha umthombo wesitatshi kunokuchaphazela iipropati zemveliso yokugqibela ye-HPStE.
2. Ukulungiswa kweNgxoxo yesitatshi: Isitatshi esikhethiweyo sichithwa emanzini ukwenza intlama yestatshi. I-paste ishushu kwiqondo lokushisa elithile ukuze i-gelatinize i-starch granules, ivumela ukuphinda kusebenze kakuhle kunye nokungena kwe-reagents kumanyathelo okuguqula alandelayo.
3. I-Etherification Reaction: I-gelatinized starch paste iphinda iphendule nge-propylene oxide (PO) phambi kwe-catalyst phantsi kweemeko ezilawulwayo. I-Propylene oxide isabela kunye namaqela e-hydroxyl (-OH) kwi-molecule ye-starch, okubangela ukuba kuqhotyoshelwe amaqela e-hydroxypropyl (-OCH2CH (OH) CH3) kwi-backbone ye-starch.
4. I-Neutralization kunye nokuhlanjululwa: Emva kokusabela kwe-etherification, umxube wokuphendula awuthathi hlangothi ukuze ususe naziphi na ii-reagents ezingaphezulu okanye i-catalysts. Isiphumo se-hydroxypropyl starch ether siye sicocwe ngeenkqubo ezifana nokuhluzwa, ukuhlamba, kunye nokomisa ukususa ukungcola kunye neekhemikhali ezishiyekileyo.
5. Ukulungiswa kobungakanani beNcam: Iimpawu ezibonakalayo ze-HPStE, ezifana nobukhulu be-particle kunye nokusabalalisa, zinokulungelelaniswa ngeenkqubo zokugaya okanye zokugaya ukufezekisa iimpawu ezifunwayo kwizicelo ezithile.

Iimpawu ezibonakalayo ze-hydroxypropyl starch ether zinokuhluka ngokuxhomekeka kwizinto ezifana neqondo lokutshintshela (DS), ubunzima bemolekyuli, ubungakanani bamasuntswana, kunye neemeko zokucubungula. Ezinye iimpawu eziqhelekileyo ze-HPStE ziquka:

1. Imbonakalo: I-HPStE iqhele ukuba ngumgubo omhlophe ukuya kumhlophe kunye nokusabalalisa ubungakanani beqhekeza elincinci. I-particle morphology inokwahluka ukusuka kwi-spherical ukuya kwiimilo ezingaqhelekanga ngokuxhomekeke kwinkqubo yokuvelisa.
2. Ubungakanani beNgxelo: Ubungakanani be-particle ye-HPStE inokuvela kwii-micrometers ezimbalwa ukuya kumashumi ee-micrometers, kunye nefuthe elibalulekileyo kwi-dispersibility yayo, i-solubility, kunye nokusebenza kwizicelo ezahlukeneyo.
3. Ubuninzi Bobuninzi: Ubuninzi be-HPStE buchaphazela ukuhamba kwayo, iimpawu zokuphatha, kunye neemfuno zokupakisha. Ngokuqhelekileyo kulinganiswa ngeegram nge cubic centimeter (g/cm³) okanye iikhilogram ngelitha (kg/L).
4. Ukunyibilika: I-HPStE ayinyibiliki emanzini abandayo kodwa inokusasazeka kwaye idumbe emanzini ashushu, yenze izisombululo ze-viscous okanye iigels. I-solubility kunye ne-hydration properties ze-HPStTE zinokwahluka ngokuxhomekeke kwizinto ezifana ne-DS, ubunzima be-molecular, kunye nobushushu.
5. I-Viscosity: I-HPStE ibonisa iimpawu ezityebileyo kunye ne-rheological control systems kwiinkqubo ezinamanzi, eziphembelela i-viscosity, ukuziphatha okuhambayo, kunye nokuzinza kokwakheka. I-viscosity yezisombululo ze-HPStE ixhomekeke kwizinto ezifana nokugxila, ubushushu, kunye nesantya sokucheba.
6. Iqondo lokuHyinwa kwamanzi: Izinga lokungena kwamanzi le-HPStE libhekiselele kwisantya efunxa ngalo amanzi kunye nokudumba ukwenza izisombululo ze-viscous okanye iijeli. Le propati ibalulekile kwizicelo apho kufuneka i-hydration ngokukhawuleza kunye nokuqina.

Ukulungiswa kunye neempawu ezibonakalayo ze-hydroxypropyl starch ether zilungelelaniswe ukuhlangabezana neemfuno ezithile zesicelo kunye neendlela zokusebenza, oko kuyenza ibe yinto eyongezelelweyo kunye nexabiso lokudibanisa kumashishini ahlukeneyo kunye nokwakheka.