Focus on Cellulose ethers

Kuyini ukusetshenziswa okuyinhloko kwe-HPMC?

I-HPMC isetshenziswa kabanzi ezintweni zokwakha, ezinengilazi, izinsalela zokwenziwa, izitsha zobumba, imithi, ukudla, izindwangu, ezolimo, izimonyo, ugwayi nezinye izimboni. I-HPMC ingahlukaniswa ngebanga lezimboni, ibanga lokudla kanye nebanga lezemithi ngokuya ngesicelo.

Uyini umthamo we-HPMC ku-putty powder?

Inani le-HPMC elisetshenziswa ekusebenzeni okungokoqobo lithintwa isimo sezulu, izinga lokushisa, izinga le-calcium yomlotha wendawo, ifomula ye-putty powder kanye nekhwalithi edingwa amakhasimende. Kukhona umehluko ezindaweni ezahlukene, ngokuvamile, kuphakathi kuka-4-5 kg.

Iyiphi i-viscosity efanele ye-hydroxypropyl methylcellulose?

Ngokuvamile, i-putty powder engu-100,000 yanele, futhi imfuneko odakeni iphezulu, futhi idinga i-150,000 ukuze kube lula ukuyisebenzisa. Ngaphezu kwalokho, umsebenzi obaluleke kakhulu we-HPMC ukugcinwa kwamanzi, okulandelwa ukujiya. Ku-putty powder, inqobo nje uma ukugcinwa kwamanzi kuhle futhi i-viscosity iphansi (7-8), kungenzeka futhi. Yiqiniso, ukuphakama kwe-viscosity, kungcono ukugcinwa kwamanzi okuhlobene. Lapho i-viscosity idlula i-100,000, i-viscosity ayinawo umthelela ekugcinweni kwamanzi. enkulu.

Yiziphi izinkomba zobuchwepheshe eziyinhloko ze-hydroxypropyl methylcellulose?

Okuqukethwe kwe-Hydroxypropyl

Okuqukethwe kwe-methyl

i-viscosity

Umlotha

Ukulahlekelwa ekomisweni

Yiziphi izinto zokusetshenziswa eziyinhloko ze-hydroxypropyl methylcellulose?

Izinto zokusetshenziswa eziyinhloko ze-HPMC: ukotini ocolisisiwe, i-methyl chloride, i-propylene oxide, ezinye izinto zokusetshenziswa, i-caustic soda, i-acid toluene.

Imuphi umsebenzi oyinhloko wokusetshenziswa kwe-hydroxypropyl methylcellulose ku-putty powder, futhi ingabe kwenzeka ngamakhemikhali?

Phakathi kwe-putty powder, idlala izindima ezintathu zokuqina, ukugcinwa kwamanzi nokwakhiwa. Ukujiya, i-cellulose ingajiya ukuze imiswe, igcine iyunifomu yekhambi iye phezulu naphansi, futhi imelane nokuntenga. Ukugcinwa kwamanzi: yenza i-putty powder yome kancane, futhi usize i-calcium yomlotha ukuba isabele ngaphansi kwesenzo samanzi. Ukwakhiwa: I-Cellulose inomphumela wokugcoba, ongenza i-putty powder ibe nokwakhiwa okuhle. I-HPMC ayibambi iqhaza kunoma yikuphi ukusabela kwamakhemikhali, kodwa idlala indima yokusiza.

IHydroxypropyl methylcellulose i-non-ionic cellulose ether, ngakho-ke yini engeyona i-ionic?

Ngokwemigomo ye-layman, izinto ezingenasici azibambi iqhaza ekuphenduleni kwamakhemikhali.

I-CMC (carboxymethyl cellulose) iyi-cationic cellulose, ngakho izophenduka ibe yi-bean curd uma ihlangana nomlotha we-calcium.

Lihlobene nani izinga lokushisa lejeli le-hydroxypropyl methylcellulose?

Izinga lokushisa lejeli le-HPMC lihlobene nokuqukethwe kwayo kwe-methoxy, ukwehla kokuqukethwe kwe-methoxy, izinga lokushisa lejeli liphezulu.

Ingabe bukhona ubuhlobo phakathi kokwehla kwe-putty powder kanye ne-hydroxypropyl methylcellulose?

Kukhona ubudlelwano! ! ! Ukugcinwa kwamanzi okungekuhle kwe-HPMC, okuzodala ukulahleka kwempushana.

Uyini umehluko phakathi kwezinhlobo zamanzi abandayo asheshayo nezishisayo ze-hydroxypropyl methylcellulose ohlelweni lokukhiqiza?

Uhlobo olusheshayo lwamanzi abandayo lwe-HPMC luphathwa phezulu nge-glyoxal, futhi luhlakazeka ngokushesha emanzini abandayo, kodwa aluncibiliki ngempela. Incibilika kuphela lapho i-viscosity ikhula. Izinhlobo ezincibilikayo ezishisayo aziphathwa nge-glyoxal. Uma inani le-glyoxal likhulu, ukuhlakazeka kuzoshesha, kodwa i-viscosity izokhula kancane, futhi uma inani lincane, okuphambene kuzoba yiqiniso.

Liyini iphunga le-hydroxypropyl methylcellulose?

I-HPMC ekhiqizwa indlela yokuncibilikisa isebenzisa i-toluene ne-isopropanol njengezincibilikisi. Uma ukugeza kungalungile kakhulu, kuzoba nephunga elisele. (Ukubuyiswa kokungathathi hlangothi kuyinqubo eyinhloko yephunga)

ungayikhetha kanjani i-hydroxypropyl methylcellulose efanele?

I-Putty powder: idinga ukugcinwa kwamanzi aphezulu, ukwakhiwa kalula

Udaka oluvamile olusekelwe kusimende: ludinga ukugcinwa kwamanzi aphezulu, ukumelana nokushisa okuphezulu, kanye ne-viscosity esheshayo (

Ukusetshenziswa kweglue yokwakha: imikhiqizo esheshayo ene-viscosity ephezulu.

I-Gypsum mortar: ukugcinwa kwamanzi aphezulu, i-viscosity ephakathi nendawo, ukwanda kwe-viscosity esheshayo

Siyini isiteketiso se-16 hydroxypropyl methylcellulose?

Kubhekiselwa kuyo njenge-HPMC noma i-MHPC elias hypromellose, cellulose hydroxypropyl methyl ether.

Ukusetshenziswa kwe-hydroxypropyl methylcellulose ku-putty powder, yisiphi isizathu se-bubbles emoyeni ku-putty powder?

Ku-putty powder, i-HPMC idlala izindima ezintathu zokuqina, ukugcinwa kwamanzi kanye nokwakha. Izizathu zamabhamuza yilezi:

(1) Kwengezwa amanzi amaningi kakhulu.

(2) Uma ungqimba olungezansi lungomile, korobha olunye ungqimba phezulu, futhi kulula ukukhihliza amagwebu.

Uyini umehluko phakathi kwe-hydroxypropyl methylcellulose ne-MC:

I-MC i-methyl cellulose, eyenziwe nge-cellulose ether ngokwelapha ukotini ocolisisiwe nge-alkali, kusetshenziswa i-methane chloride njenge-etherification agent, futhi ibhekana nochungechunge lokusabela. Ngokuvamile, izinga lokushintsha lingu-1.6-2.0, futhi ukuncibilika kuyahlukahluka ngamazinga ahlukene okushintsha. Okuhlukile, ingeye-non-ionic cellulose ether.

(1) Ukugcinwa kwamanzi kwe-methylcellulose kuncike enanini layo elingeziwe, i-viscosity, ukucoleka kwezinhlayiyana nezinga lokuqedwa. Ngokuvamile, uma inani elingeziwe likhulu, ukucoleka kuncane, futhi i-viscosity inkulu, izinga lokugcinwa kwamanzi liphezulu. Phakathi kwazo, inani elingeziwe linomthelela omkhulu esilinganisweni sokugcinwa kwamanzi kwabantu. I-viscosity ayilingani nezinga lokugcinwa kwamanzi. Izinga lokuhlakazeka lincike ikakhulukazi ebusweni bezinhlayiya ze-cellulose. I-Degree yokuguqulwa kanye ne-particle fineness. Phakathi kwama-cellulose ether angenhla, i-methyl cellulose ne-hydroxypropyl methyl cellulose anamazinga aphezulu okugcina amanzi.

(2) I-methylcellulose iyancibilika emanzini abandayo, futhi kuyoba nzima ukuyincibilika emanzini ashisayo. Isixazululo saso esinamanzi sizinzile kakhulu ebangeni elithi ph=3-12. Inokuhambisana okuhle nesitashi, njll kanye nama-surfactants amaningi. Lapho izinga lokushisa lapho izinga lokushisa le-gelation lifinyelelwa, i-gelation izokwenzeka.

(3) Ukushintsha kwezinga lokushisa kuzothinta kakhulu izinga lokugcinwa kwamanzi e-methyl cellulose. Ngokuvamile, izinga lokushisa liphakeme, izinga lokugcinwa kwamanzi libi kakhulu. Uma izinga lokushisa lodaka lidlula ama-degree angu-40, ukugcinwa kwamanzi kwe-methyl cellulose kuzoncishiswa kakhulu, okuzothinta kakhulu ukwakhiwa kodaka.

(4) I-Methyl cellulose inomthelela omkhulu ekwakhiweni nasekunamatheleni kodaka. Ukunamathela lapha kubhekisela emandleni okunamathela azwakalayo phakathi kwethuluzi lesisebenzi lesifakeli kanye ne-substrate yodonga, okungukuthi, ukumelana nokugunda kodaka. I-adhesiveness iphezulu, ukumelana kwe-shear kodaka kukhulu, futhi amandla adingwa ngabasebenzi ngesikhathi sokusetshenziswa nawo makhulu, futhi ukwakhiwa kodaka kumpofu.

IHydroxypropyl methylcellulose ihlukaniswe yaba izinhlobo eziningana, futhi yimuphi umehluko ekusetshenzisweni kwayo?

I-HPMC ingahlukaniswa ngohlobo olusheshayo (isijobelelo segama lomkhiqizo "S") kanye nohlobo lwe-hot-melt. Imikhiqizo yohlobo olusheshayo ihlakazeka ngokushesha emanzini abandayo bese inyamalala emanzini. Ngalesi sikhathi, uketshezi alunayo i-viscosity ngoba i-HPMC ihlakazekile emanzini ngaphandle kokuhlakazeka kwangempela. Cishe (ukunyakazisa) imizuzu emi-2, i-viscosity yoketshezi iyanda kancane kancane, yakha i-viscous colloid esobala. Imikhiqizo encibilikayo eshisayo, lapho ihlangana namanzi abandayo, ingahlakazeka ngokushesha emanzini ashisayo futhi inyamalale emanzini ashisayo. Lapho izinga lokushisa lehla ekushiseni okuthile (ngokuvumelana nezinga lokushisa lejeli lomkhiqizo), i-viscosity izovela kancane kancane ize yakha i-viscous colloid ebonakalayo.

Yiziphi izindlela zokuchithwa kwe-hydroxypropyl methylcellulose?

I-1) Wonke amamodeli angangezwa kundaba ngendlela yokuxuba okomile;

2) Uma idinga ukungezwa ngokuqondile kwisisombululo esinamanzi sokushisa esivamile, kungcono ukusebenzisa uhlobo lokuhlakazeka kwamanzi abandayo, futhi ngokuvamile kuthatha imizuzu eyi-10-90 ukujiya ngemva kokungeza (goqoza futhi ugovuze)

3) Imodeli evamile iyashukunyiswa futhi ihlakazwe ngamanzi ashisayo kuqala, bese ingancibilika ngemva kokwengeza amanzi abandayo ukuze inyakaze futhi ipholile;

I-4) Uma i-agglomeration kanye nokugoqa kwenzeka ngesikhathi sokuchithwa, kungenxa yokuthi ukugqugquzela akwanele noma imodeli evamile yengezwa ngokuqondile emanzini abandayo. Ngalesi sikhathi, kufanele ixutshwe ngokushesha. i

I-5) Uma ama-bubbles ekhiqizwa ngesikhathi sokuchithwa, angashiywa ukuze ame amahora angu-2-12 (isikhathi esinqunyiwe sinqunywa ukuvumelana kwesixazululo) noma asuswe ngokucofa, ukucindezela, njll., noma inani elifanele le-ejenti yokukhipha amagwebu. zingangezwa. i

Ungahlulela kanjani ikhwalithi ye-hydroxypropyl methylcellulose kalula nangokunembile?

1) Ubumhlophe, nakuba ubumhlophe bungakwazi ukunquma ukuthi i-HPMC kulula ukuyisebenzisa yini, futhi uma ama-ejenti amhlophe engezwa enqubweni yokukhiqiza, izothinta ikhwalithi yayo, kodwa iningi lemikhiqizo emihle inobumhlophe obuhle.

2) Ukulunga: Ubucwebe be-HPMC buvamise ukuba ne-mesh engu-80 kanye ne-100 mesh, i-120 mesh mincane, okucolekayo kuba ngcono.

3) Ukudlulisa ukukhanya: Ngemva kokuthi i-HPMC ifakwe emanzini ukuze yakhe i-colloid esobala, bheka ukudlulisa ukukhanya kwayo. Uma ukudlulisa ukukhanya kukhulu, kungcono, okubonisa ukuthi kukhona okuncane okungancibiliki kuyo, futhi ukudluliswa kwama-reactor aqondile ngokuvamile kuhle. , I-reactor evundlile yimbi kakhulu, kodwa akusho ukuthi ikhwalithi ye-reactor eqondile ingcono kune reactor evundlile, futhi kunezici eziningi zokunquma ikhwalithi yomkhiqizo.

4) Amandla adonsela phansi athize: Uma umkhulu amandla adonsela phansi athile, uyasinda kakhulu. Ukuphakama kwamandla adonsela phansi athile, kuyanda okuqukethwe kwe-hydroxypropyl emkhiqizweni. Ukuphakama kokuqukethwe kwe-hydroxypropyl, kuba ngcono ukugcinwa kwamanzi.


Isikhathi sokuthumela: Nov-24-2022
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