Ungawugweba njani umgangatho weHydroxypropyl Methyl Cellulose HPMC?

(1). Umahluko phakathi kwe-hydroxypropyl methylcellulose (HPMC) ecocekileyo kunye ne-hydroxypropyl methylcellulose ecocekileyo (HPMC)
1. Ukubonakala: I-hydroxypropyl methylcellulose ecocekileyo i-HPMC ibonakala i-fluffy kwaye inobuninzi obuphantsi, ukusuka kwi-0.3-0.4g / ml; i-hydroxypropyl methylcellulose enziwe i-HPMC ingcono ukumanzi kwaye ivakala inzima, kwaye kukho umahluko omkhulu kwinkangeleko kwimveliso yokwenyani.
2. Isimo: I-hydroxypropyl methylcellulose ecocekileyo ye-HPMC powder i-fibrous phantsi kwe-microscope okanye iglasi yokukhulisa; ngelixa i-hydroxypropyl methylcellulose i-HPMC edibeneyo inokubonwa njengezinto eziqinileyo zegranular okanye iikristale phantsi kwe-microscope okanye iglasi yokukhulisa.

3. Ivumba: I-hydroxypropyl methylcellulose ecocekileyo i-HPMC ayinakuvumba ivumba le-ammonia, isitashi kunye notywala; i-chargerated hydroxypropyl methylcellulose I-HPMC inokujoja zonke iintlobo zevumba, nokuba ayinancasa, iyaKuziva inzima.
4. Isisombululo samanzi: i-hydroxypropyl methylcellulose ecocekileyo Isisombululo se-HPMC samanzi sicacile, ukuhanjiswa kokukhanya okuphezulu, izinga lokugcinwa kwamanzi ≥ 97%; i-hydroxypropyl methylcellulose isisombululo se-aqueous se-HPMC esixutywe ne-turbid, kwaye izinga lokugcinwa kwamanzi kunzima ukufikelela kuma-80%.

(2), ukugcinwa kwamanzi kwe-hydroxypropyl methylcellulose HPMC, yahlula okulungileyo kunye nokungalunganga:

Ukugcinwa kwamanzi kwe-methyl cellulose ether phantsi kweemeko eziphezulu zeqondo lokushisa luphawu olubalulekileyo lokuhlukanisa umgangatho we-methyl cellulose ether. Izinto ezifana nobushushu bomoya, ubushushu kunye nesantya soxinzelelo lomoya ziya kuchaphazela izinga lokuguquguquka kwamanzi kudaka lwesamente kunye neemveliso ezisekwe kwigypsum. Ke ngoko, ngamaxesha ahlukeneyo, kukho umahluko kwisiphumo sokugcinwa kwamanzi kwiimveliso ezinobungakanani obufanayo be-HPMC bongeziweyo. Kulwakhiwo oluthile, umphumo wokugcinwa kwamanzi we-slurry unokulungiswa ngokunyuka okanye ukunciphisa inani le-HPMC elongezelelweyo. Iimveliso ezigqwesileyo ze-hydroxypropyl methylcellulose ze-HPMC zinokucombulula ngempumelelo ingxaki yokugcinwa kwamanzi phantsi kobushushu obuphezulu.

Umgangatho ophezulu we-methylcellulose unokusasazwa ngokulinganayo nangokufanelekileyo kwi-cement mortar kunye neemveliso ezisekelwe kwi-gypsum, kwaye ubophe zonke iinqununu eziqinileyo, kwaye wenze ifilimu yokumanzisa, ukufuma kwisiseko kukhishwa ngokuthe ngcembe ixesha elide, kunye ne-inorganic reaction. yezinto ze-gelled ziqinisekisa amandla ebhondi kunye namandla okunyamezela kwezinto. Umgangatho ophezulu we-hydroxypropyl methylcellulose HPMC, ukufana kwayo kuhle kakhulu, i-methoxy yayo kunye namaqela e-hydroxypropoxy asasazwa ngokulinganayo kunye ne-cellulose ye-molecular chain, inokunyusa i-oksijini kwi-hydroxyl kunye ne-ether bond Ukukwazi kwee-athomu ukudibanisa namanzi ukwenza iibhondi ze-hydrogen. uguqula amanzi asimahla abe ngamanzi abophekileyo, ngaloo ndlela ulawula ngokufanelekileyo ukuphuphuma kwamanzi okubangelwa bubushushu obuphezulu bemozulu kunye nokuphumeza ukugcinwa kwamanzi okuphezulu.
Ngoko ke, kulwakhiwo oluphezulu lwasehlotyeni, ukuze kufezekiswe umphumo wokugcinwa kwamanzi, kuyimfuneko ukongeza iimveliso ze-HPMC ezikumgangatho ophezulu ngobungakanani obaneleyo ngokwefomula, ngaphandle koko, kuya kubakho ukungonelanga kwe-hydration, ukunciphisa amandla, ukuqhekeka, ukugoba. kunye nokuphalala okubangelwa kukomiswa ngokugqithisileyo. iingxaki, kodwa ukwandisa ubunzima bokwakha kwabasebenzi. Njengoko iqondo lobushushu liyehla, ubungakanani bamanzi HPMC eyongeziweyo ingancitshiswa ngokuthe ngcembe, kwaye isiphumo efanayo yokugcina amanzi inokufumaneka.

(3) Ukuchithwa kwe-hydroxypropyl methylcellulose HPMC

Kushishino lokwakha,ihydroxypropyl methylcellulose HPMCidla ngokufakwa emanzini angathathi hlangothi, kwaye imveliso ye-HPMC inyibilika yodwa ukuze igwebe izinga lokuchithwa. Emva kokufakwa kumanzi angathathi hlangothi yedwa, imveliso edibanisa ngokukhawuleza ngaphandle kokusabalalisa imveliso ngaphandle kokunyanga kwendawo; emva kokufakwa emanzini angathathi hlangothi yedwa, imveliso enokuthi isasazeke kwaye ingadibanisi kunye yimveliso enonyango oluphezulu. Xa umphezulu ongaphathwanga i-hydroxypropyl methylcellulose HPMC inyibilika yodwa, i-particle yayo enye inyibilika ngokukhawuleza kwaye yenza ifilimu ngokukhawuleza, ibangela ukuba amanzi angaphinde angene kwamanye amasuntswana, okukhokelela kwi-agglomeration kunye ne-agglomeration, ngoku ebizwa ngokuba yi-slow dissolution kwimveliso yemarike.

I-Surface-treated hydroxypropyl methylcellulose i-HPMC imveliso yeengqungquthela, emanzini angathathi hlangothi, iinqununu zomntu ngamnye ziyakwazi ukusabalalisa ngaphandle kwe-agglomeration, kodwa i-viscosity yemveliso ayiyi ngokukhawuleza. Emva kokucwina ixesha elithile, ulwakhiwo lwekhemikhali yonyango lomphezulu luyatshatyalaliswa, kwaye amanzi anokunyibilikisa amasuntswana eHPMC. Ngeli xesha, amasuntswana emveliso asasazeke ngokupheleleyo kwaye afunxa amanzi aneleyo, ngoko ke imveliso ayiyi kudibanisa okanye idibanise emva kokuchithwa. Isantya sokusasazwa kunye nesantya sokuchithwa sixhomekeke kwiqondo lonyango lomphezulu. Ukuba unyango lomphezulu luncinci, isantya sokusasazeka siyacotha kwaye isantya sokuncamathela sikhawuleza; ngelixa imveliso enonyango olunzulu lomphezulu inesantya esikhawulezayo sokusasazeka kunye nesantya sokuncamathela esicothayo. Ukuba ufuna ukwenza olu luhlu lweemveliso zinyibilike ngokukhawuleza kule meko, unokulahla inani elincinci lezinto zealkaline xa zinyibilika zodwa. Imarike yangoku idla ngokubizwa ngokuba ziimveliso zangoko nangoko. Iimpawu zeemveliso ze-HPMC eziphathwe ngomphezulu zezi: kwisisombululo esinamanzi, amasuntswana anokuthi ahlakazeke omnye komnye, anganyibilika ngokukhawuleza kwimo ye-alkaline, kwaye anyibilike ngokukhawuleza kwimeko engathathi hlangothi kunye ne-acidic.

Iimpawu ze-hydroxypropyl methylcellulose HPMC ezingaphathwanga zezi: i-particle enye inyibilika ngokukhawuleza kwi-acidic, alkaline, kunye ne-neutral states, kodwa ayikwazi ukusabalalisa phakathi kwamaqhekeza kulwelo, okukhokelela ekuhlanganiseni kunye ne-agglomeration. Ekusebenzeni okwenyani, emva kokusasazeka ngokomzimba kolu luhlu lweemveliso kunye namasuntswana aqinileyo afana nomgubo werabha, isamente, isanti, njl. Xa kuyimfuneko ukunyibilikisa iimveliso HPMC ngokwahlukeneyo, olu luhlu iimveliso kufuneka isetyenziswe ngononophelo, njengoko iya agglomerate kwaye ubambe kunye. Ukuba kuyimfuneko ukunyibilikisa i-hydroxypropyl methylcellulose imveliso ye-HPMC engaphathwanga phezu komhlaba ngokwahlukileyo, kufuneka ihlakazwe ngokufanayo kunye ne-95 ° C yamanzi ashushu, kwaye ipholile ukuze inyibilike.

Kumsebenzi wokwenene wemveliso, olu luhlu lweemveliso luhlala lunyibilika emva kokuba luhlakazwe kunye nezinye izinto eziqinileyo phantsi kweemeko ze-alkaline, kwaye izinga lokuchithwa kwayo alifani naleyo yeemveliso ezingaphendulwanga. Ikwafanelekile ukusetyenziswa kwiimveliso ezichithwe zodwa, ngaphandle kwe-caking okanye izibonda. Imodeli ethile yemveliso inokukhethwa ngokwezinga lokuchithwa elifunekayo kulwakhiwo.
Ngexesha lenkqubo yokwakha, nokuba i-samente yodaka okanye i-slurry esekelwe kwi-gypsum, uninzi lwazo ziinkqubo ze-alkaline, kwaye inani le-HPMC elongezelelweyo lincinci kakhulu, elinokuthi lihlakazwe ngokulinganayo phakathi kwezi ntwana. Xa amanzi esongezwa, i-HPMC iya kunyibilika ngokukhawuleza.