Funda nge-hydroxypropyl methylcellulose

1. Yikuphi ukusetshenziswa okuyinhloko kwe-hydroxypropyl methylcellulose?

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 ngokusetshenziswa kwayo.

2. Kunezinhlobo eziningana ze-hydroxypropyl methylcellulose. Uyini umehluko phakathi kwabo?

I-HPMC ingahlukaniswa ngohlobo olusheshayo (isijobelelo somkhiqizo “S”) kanye nohlobo oluncibilikayo. Imikhiqizo yohlobo olusheshayo ihlakazeka ngokushesha emanzini abandayo futhi inyamalale emanzini. Ngalesi sikhathi, uketshezi alunayo i-viscosity ngoba i-HPMC ihlakazekile emanzini kuphela futhi ayinaso isisombululo sangempela. Ngemuva kwemizuzu emi-2 (enyakazayo), i-viscosity yoketshezi iyanda kancane futhi kwakheka i-viscous colloid esobala. Imikhiqizo encibilikayo encibilikayo, emanzini abandayo, ingahlakazeka ngokushesha emanzini ashisayo futhi inyamalale emanzini ashisayo. Lapho izinga lokushisa lehla lifinyelela ekushiseni okuthile (ngokuvumelana nezinga lokushisa lejeli lomkhiqizo), i-viscosity ibonakala kancane kuze kube yilapho kwakhiwa i-colloid esobala ne-viscous.

3. Yiziphi izindlela zesixazululo se-hydroxypropyl methylcellulose?

1. Wonke amamodeli angangezwa kundaba ngokuxuba okomile;

2. Idinga ukungezwa ngokuqondile kwisisombululo esinamanzi esishisayo esivamile. Kungcono ukusebenzisa uhlobo lokuhlakazwa kwamanzi abandayo. Ngemuva kokwengeza, imvamisa ifinyelela ukushuba phakathi kwemizuzu eyi-10-90 (goqa, gudluza, gudluza)

3. Ukuze uthole amamodeli ajwayelekile, gudluza futhi uhlakaze ngamanzi ashisayo kuqala, bese ufaka amanzi abandayo ukuze uhlakaze ngemva kokugqugquzela nokupholisa.

4. Uma i-agglomeration noma ukugoqa kwenzeka ngesikhathi sokuchithwa, kungenxa yokuthi ukugoqa akwanele noma imodeli evamile yengezwa ngokuqondile emanzini abandayo. Kuleli qophelo, gxuma ngokushesha.

5. Uma ama-bubbles ekhiqizwa ngesikhathi sokuchithwa, angashiywa amahora angu-2-12 (isikhathi esithile sincike ekuhambisaneni kwesixazululo) noma asuswe ngokukhipha i-vacuum, i-pressurization, njll., kanye nenani elifanele le-ejenti yokukhipha kwengezwe.

4. Indlela yokwahlulela ikhwalithi ye-hydroxypropyl methylcellulose kalula nangendlela enembile?

1. Ubumhlophe. Nakuba ubumhlophe bungakwazi ukwahlulela ukuthi i-HPMC yinhle noma cha, futhi ukwengeza ama-ejenti amhlophe phakathi nenqubo yokukhiqiza kuzothinta ikhwalithi yayo, imikhiqizo eminingi emihle inobumhlophe obuhle.

2. Ukulunga: Ukucoleka kwe-HPMC kuvamise ukuba yi-80 mesh kanye ne-100 mesh, ngaphansi kuka-120, kungcono kakhulu.

3. Ukudlulisa ukukhanya: I-HPMC yenza i-colloid esobala emanzini. Bheka i-transmittance yokukhanya. Uma kukhulu ukudluliswa kokukhanya, kungcono ukungeneka, okusho ukuthi kunezinto ezincane ezingancibiliki kuyo. I-reactor emile ngokuvamile ilungile, futhi i-reactor evundlile izokhipha okunye. Kodwa ngeke kushiwo ukuthi izinga lokukhiqiza lamaketela aqondile lingcono kunamaketela avundlile. Kunezici eziningi ezinquma ikhwalithi yomkhiqizo.

4. Amandla adonsela phansi athile: Lapho amandla adonsela phansi athile emakhulu, isisindo siba ngcono kakhulu. Uma kukhulu amandla adonsela phansi athile, kuyanda okuqukethwe kwe-hydroxypropyl. Ngokuvamile, ukuphakama kwe-hydroxypropyl okuqukethwe, kuba ngcono ukugcinwa kwamanzi.

5. Ingakanani i-hydroxypropyl methylcellulose esetshenziswa ku-putty powder?

Inani le-HPMC elisetshenziswa ekusetshenzisweni kwangempela liyahlukahluka ezindaweni ngezindawo, ngokuvamile, liphakathi kuka-4-5 kg, kuye ngesimo sezulu, izinga lokushisa, izinga lomlotha we-calcium wendawo, ifomula ye-putty powder kanye nezidingo zekhwalithi yekhasimende.

6. Iyini i-viscosity ye-hydroxypropyl methylcellulose?

I-putty powder ngokuvamile ibiza i-RMB 100,000, kanti udaka lunezidingo eziphezulu. Kubiza u-RMB 150,000 ukuze kube lula ukuyisebenzisa. Ngaphezu kwalokho, umsebenzi obaluleke kakhulu we-HPMC ukugcina amanzi, okulandelwa ukujiya. Ku-putty powder, inqobo nje uma ukugcinwa kwamanzi kuhle futhi i-viscosity iphansi (7-8), kungenzeka futhi. Yiqiniso, uma i-viscosity inkulu, kungcono ukugcinwa kwamanzi okuhlobene. Lapho i-viscosity ingaphezu kuka-100,000, i-viscosity inethonya elincane ekugcineni kwamanzi.

7. Yiziphi izinkomba zobuchwepheshe eziyinhloko ze-hydroxypropyl methylcellulose?

Okuqukethwe kwe-Hydroxypropyl

Okuqukethwe kwe-methyl

i-viscosity

Umlotha

ukulahlekelwa isisindo esomile

8. 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, ne-acid toluene.

9. Ukusetshenziswa kanye nomsebenzi oyinhloko we-hydroxypropyl methylcellulose ku-putty powder, ingabe amakhemikhali?

Ku-putty powder, idlala imisebenzi emithathu emikhulu: ukuqina, ukugcinwa kwamanzi nokwakhiwa. Ukujiya kungajiyisa i-cellulose futhi kudlale indima yokumisa, kugcine iyunifomu yesisombululo iphezulu naphansi futhi ivimbele ukuwohloka. Ukugcinwa kwamanzi: Yenza i-putty powder yome kancane futhi usize i-calcium empunga ukuthi isabele ngaphansi kwesenzo samanzi. Ukusebenza kahle: I-Cellulose inomphumela wokugcoba, okwenza i-putty powder ibe nokusebenza okuhle. I-HPMC ayibambi iqhaza kunoma yikuphi ukusabela kwamakhemikhali futhi idlala indima yokusekela kuphela.

10. I-Hydroxypropyl methylcellulose i-non-ionic cellulose ether, ngakho-ke iluphi uhlobo olungezona i-ionic?

Ngokuvamile, izinto ezingenasici azihlanganyeli ekuphenduleni kwamakhemikhali.

I-CMC (carboxymethylcellulose) iyi-cationic cellulose futhi izophenduka ibe yi-tofu dregs uma ichayeke kumlotha we-calcium.

11. Lihlobene nani izinga lokushisa lejeli le-hydroxypropyl methylcellulose?

Izinga lokushisa lejeli le-HPMC lihlobene nokuqukethwe kwayo kwe-methoxyl. Ukuncipha kokuqukethwe kwe-methoxyl, izinga lokushisa lejeli liphezulu.

12. Ingabe bukhona ubuhlobo phakathi kwe-putty powder ne-hydroxypropyl methylcellulose?

Lokhu kubalulekile! I-HPMC ayigcini kahle amanzi futhi izodala impushana.

13. Uyini umehluko ohlelweni lokukhiqiza phakathi kwesisombululo samanzi abandayo nesisombululo samanzi ashisayo se-hydroxypropyl methylcellulose?

Uhlobo oluncibilikayo lwamanzi abandayo lwe-HPMC luhlakazwa ngokushesha emanzini abandayo ngemuva kokwelashwa okungaphezulu nge-glyoxal, kodwa empeleni aluncibiliki. I-viscosity iyakhuphuka, okungukuthi, iyancibilika. Uhlobo lwe-hot melt aluphathwa nge-glyoxal. I-Glyoxal inkulu ngosayizi futhi ihlakazeka ngokushesha, kodwa ine-viscosity ehamba kancane kanye nevolumu encane, futhi ngokuphambene nalokho.

14. Liyini iphunga le-hydroxypropyl methylcellulose?

I-HPMC ekhiqizwa indlela yokuncibilikisa yenziwa nge-toluene ne-isopropyl alcohol njengezincibilikisi. Uma ingagezwanga kahle, kuzoba nephunga elisele. (Ukungathathi hlangothi kanye nokugaywa kabusha kuyinqubo ebalulekile yephunga)

15. Ingakhetha kanjani i-hydroxypropyl methylcellulose efanele ukuze isetshenziswe ngokuhlukile?

I-Putty powder: izimfuneko zokugcina amanzi aphezulu kanye nokwenza lula okuhle kokwakha (uphawu olunconyiwe: 7010N)

Udaka olujwayelekile olusekelwe kusimende: ukugcinwa kwamanzi aphezulu, ukumelana nokushisa okuphezulu, i-viscosity esheshayo (ibanga elinconyiwe: HPK100M)

Isicelo sokunamathisela ukwakhiwa: umkhiqizo osheshayo, i-viscosity ephezulu. (Umkhiqizo onconyiwe: HPK200MS)

I-Gypsum mortar: ukugcinwa kwamanzi aphezulu, i-viscosity ephansi ephakathi, i-viscosity esheshayo (ibanga elinconyiwe: HPK600M)

16. Yiliphi elinye igama le-hydroxypropyl methylcellulose?

I-HPMC noma i-MHPC yaziwa nangokuthi i-hydroxypropyl methylcellulose kanye ne-hydroxypropyl methylcellulose ether.

17. Ukusetshenziswa kwe-hydroxypropyl methylcellulose ku-putty powder. Yini eyenza i-putty powder ibe igwebu?

I-HPMC idlala izindima ezintathu ezinkulu ku-putty powder: ukuqina, ukugcinwa kwamanzi kanye nokwakha. Izizathu zamabhamuza yilezi:

1. Faka amanzi amaningi kakhulu.

2. Uma phansi kungomile, ukuklwebha olunye ungqimba phezulu kuzodala amabhamuza kalula.

18. Uyini umehluko phakathi kwe-hydroxypropyl methylcellulose ne-MC:

I-MC, i-methyl cellulose, yenziwe kusukela kukotini ocolisisiwe ngemva kokwelashwa kwe-alkali, kusetshenziswa i-methane chloride njenge-ejenti ye-etherifying, kanye nochungechunge lokusabela ukukhiqiza i-cellulose ether. Izinga elijwayelekile lokushintsha lingu-1.6-2.0, futhi ukunyibilika kwamadigri ahlukene okushintsha nakho kuhlukile. I-non-ionic cellulose ether.

(1) Ukugcinwa kwamanzi kwe-methylcellulose kuncike enanini layo elingeziwe, i-viscosity, ukucoleka kwezinhlayiyana nezinga lokuqedwa. Ngokuvamile, inani elingeziwe likhulu, ukucoleka kuncane, i-viscosity iphezulu, futhi izinga lokugcinwa kwamanzi liphezulu. Inani elingeziwe linomthelela omkhulu ekugcinweni kwamanzi, futhi i-viscosity ayihlangene nenani lokugcinwa kwamanzi. Izinga lokuncibilika lincike kakhulu kwidigri yokuguqulwa komhlaba kanye nokucoleka kwezinhlayiyana zezinhlayiya ze-cellulose. Phakathi kwama-cellulose ethers angenhla, i-methylcellulose ne-hydroxypropylmethylcellulose anamazinga aphezulu okugcina amanzi.

(2) I-Methyl cellulose ingancibilika emanzini abandayo, kodwa izobhekana nobunzima ekuhlakazweni emanzini ashisayo. Isixazululo saso esinamanzi sizinzile kakhulu ebangeni le-pH=3-12, futhi sinokuhambisana kahle nesitashi nama-surfactants amaningi. Lapho izinga lokushisa lifinyelela i-gel Lapho izinga lokushisa le-gelation likhuphuka, i-gelation izokwenzeka.

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

(4) I-Methylcellulose inomthelela omkhulu ekwakhiweni nasekubambeleleni kodaka. Ukunamathela lapha kubhekisela ekunamatheleni okuzwakalayo phakathi kwethuluzi lesicelo lesisebenzi kanye nesisekelo sodonga, okungukuthi, ukumelana kwe-shear kodaka. Ukunamathela kuphezulu, ukumelana kwe-shear kodaka kuphezulu, futhi amandla adingwa abasebenzi ngesikhathi sokusetshenziswa nawo aphezulu, ngakho-ke ukusebenza kokwakhiwa kodaka kumpofu.