Focus on Cellulose ethers

FAQ Mayelana neHydroxypropyl Methyl Cellulose

1. Iyini ukusetshenziswa okuyinhloko kwe-hydroxypropyl methylcellulose (HPMC)?

——Impendulo: I-Hydroxypropyl methylcellulose isetshenziswa kakhulu ezintweni zokwakha, okokugqoka, ama-synthetic resin, izitsha zobumba, imithi, ukudla, izindwangu, ezolimo, izimonyo, ugwayi nezinye izimboni. IHydroxypropyl methylcellulose ingahlukaniswa ngebanga lokwakha, ibanga lokudla kanye nebanga lezemithi ngokuya ngokusebenza kwayo. Njengamanje, iningi lemikhiqizo yasekhaya isezingeni lokwakha. Ebangeni lokwakha, i-putty powder isetshenziswa ngenani elikhulu, cishe i-90% isetshenziselwa i-putty powder, kanti enye isetshenziselwa udaka lukasimende neglue.

2. Kunezinhlobo ezimbalwa ze-hydroxypropyl methylcellulose (HPMC), futhi yimuphi umehluko ekusetshenzisweni kwazo?

——Impendulo: I-HPMC ingahlukaniswa ngohlobo olusheshayo kanye nohlobo lokuqedwa okushisayo. 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 imizuzu emi-2, i-viscosity yoketshezi iyanda kancane kancane, yakha i-viscous colloid esobala. Imikhiqizo encibilikayo eshisayo, lapho ihlangene namanzi abandayo, ingahlakazeka ngokushesha emanzini ashisayo futhi inyamalale emanzini ashisayo. Lapho izinga lokushisa lehlela ezingeni elithile lokushisa, i-viscosity izovela kancane kancane ize yakhe i-viscous colloid ebonakalayo. Uhlobo lwe-hot-melt lungasetshenziswa kuphela ku-putty powder nodaka. Ku-glue ewuketshezi nopende, kuzoba khona umcimbi wokuqoqa futhi awukwazi ukusetshenziswa. Uhlobo olusheshayo lunohlu olubanzi lwezinhlelo zokusebenza. Ingasetshenziswa ku-putty powder nodaka, kanye ne-glue ewuketshezi nopende, ngaphandle kokuphikisana.

3. Yiziphi izindlela zokuchithwa kwe-hydroxypropyl methylcellulose (HPMC)?

——Impendulo: Indlela yokuchithwa kwamanzi ashisayo: Njengoba i-HPMC ingancibiliki emanzini ashisayo, i-HPMC ingahlakazwa ngokulinganayo emanzini ashisayo esigabeni sokuqala, bese incibilika ngokushesha lapho ipholisa. Izindlela ezimbili ezijwayelekile zichazwa kanje:

1) Faka inani elidingekayo lamanzi ashisayo esitsheni bese ushisa kuze kufike ku-70°C. I-hydroxypropyl methylcellulose yengezwa kancane kancane ngaphansi kokunyakaziswa kancane, ekuqaleni i-HPMC yantanta phezu kwamanzi, bese kancane kancane yakha i-slurry, eyapholiswa ngaphansi kokunyakaziswa.

2), engeza i-1/3 noma i-2/3 yenani elidingekayo lamanzi esitsheni, bese ushisisa ku-70 ° C, uhlakaze i-HPMC ngokwendlela ye-1), futhi ulungise udaka lwamanzi ashisayo; bese ufaka inani elisele lamanzi abandayo emanzini ashisayo ashisayo, ingxube ipholile ngemva kokugqugquzela.

Indlela yokuxuba uphuphu: hlanganisa i-HPMC powder nenani elikhulu lezinye izinto eziyimpuphu, xuba kahle ne-mixer, bese wengeza amanzi ukuze uhlakaze, bese i-HPMC ingancibilika ngalesi sikhathi ngaphandle kokuhlanganiswa, ngoba kune-HPMC encane kuphela kuwo wonke amancanyana. I-corner Powder, izoncibilika ngokushesha lapho ihlangana namanzi. ——Abakhiqizi bempuphu nodaka basebenzisa le ndlela. [I-Hydroxypropyl methylcellulose (HPMC) isetshenziswa njenge-thickener kanye ne-ejenti yokugcina amanzi kudaka lwe-putty powder.

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

——Impendulo: (1) Ubumhlophe: Nakuba ubumhlophe bungakwazi ukunquma ukuthi i-HPMC kulula yini ukuyisebenzisa, futhi uma ama-ejenti amhlophe engezwa phakathi nenqubo yokukhiqiza, izothinta ikhwalithi yayo. Nokho, iningi lemikhiqizo emihle inobumhlophe obuhle. (2) Ubuhle: Ubucwebe be-HPMC ngokuvamile buba ne-80 mesh kanye ne-100 mesh, kanye ne-120 mesh mincane. Iningi le-HPMC elikhiqizwe e-Hebei linezikhala ezingama-80. Ubuhle obuhle, uma sikhuluma nje, kuba ngcono. (3) Ukudlulisa ukukhanya: faka i-hydroxypropyl methylcellulose (HPMC) emanzini ukuze wenze i-colloid ekhanyelayo, bese ubheka ukudlulisa ukukhanya kwayo. Ukudlulisa ukukhanya okukhulu, kungcono, okubonisa ukuthi kukhona okuncane okungancibiliki kuwo. . Ukufinyeleleka kwama-reactor aqondile ngokuvamile kuhle, futhi lokho kwama-reactor avundlile kubi kakhulu, kodwa akusho ukuthi ikhwalithi yama-reactor aqondile ingcono kunaleyo yama-reactor avundlile, futhi ikhwalithi yomkhiqizo inqunywa izici eziningi. (4) Amandla adonsela phansi athize: Uma umkhulu amandla adonsela phansi athile, uyasinda kakhulu. Ukucaciswa kukhulu, ngokuvamile ngenxa yokuthi okuqukethwe kweqembu le-hydroxypropyl kulo kuphezulu, futhi okuqukethwe kweqembu le-hydroxypropyl kuphezulu, ukugcinwa kwamanzi kungcono.

5. Iyini inani le-hydroxypropyl methylcellulose (HPMC) ku-putty powder?

——Impendulo: Inani le-HPMC elisetshenziswa ekusebenzeni okungokoqobo liyahlukahluka kuye ngokuthi isimo sezulu, izinga lokushisa, izinga le-calcium yomlotha wendawo, ifomula ye-putty powder kanye “nekhwalithi edingwa amakhasimende”. Ngokuvamile, phakathi kuka-4 kg no-5 kg. Isibonelo: iningi le-putty powder e-Beijing liyi-5 kg; iningi lempushana e-Guizhou lingama-5 kg ​​ehlobo kanye no-4.5 kg ebusika; inani le-putty e-Yunnan lincane kakhulu, ngokuvamile li-3 kg kuya ku-4 kg, njll.

6. Iyiphi i-viscosity efanele ye-hydroxypropyl methylcellulose (HPMC)?

——Impendulo: Ngokuvamile, ama-yuan angu-100,000 anele kumpushana we-putty, futhi izidingo zodaka ziphakeme, futhi 150,000 yuan iyadingeka ukuze isetshenziswe kalula. Ngaphezu kwalokho, umsebenzi obaluleke kakhulu we-HPMC ukugcinwa kwamanzi, okulandelwa ukujiya. Ku-putty powder, inqobo nje uma ukugcinwa kwamanzi kuhle futhi i-viscosity iphansi (70,000-80,000), kungenzeka futhi. Yiqiniso, ukuphakama kwe-viscosity, kungcono ukugcinwa kwamanzi okuhlobene. Lapho i-viscosity idlula i-100,000, i-viscosity izothinta ukugcinwa kwamanzi. Akusenani.

7. Yiziphi izinkomba zobuchwepheshe eziyinhloko ze-hydroxypropyl methylcellulose (HPMC)?

——Impendulo: Okuqukethwe kwe-Hydroxypropyl kanye ne-viscosity, abasebenzisi abaningi bakhathazekile ngalezi zinkomba ezimbili. Labo abanokuqukethwe okuphezulu kwe-hydroxypropyl ngokuvamile banokugcinwa kwamanzi okungcono. Le ene-viscosity ephezulu inokugcinwa kwamanzi okungcono, uma kuqhathaniswa (hhayi ngokuphelele), futhi leyo ene-viscosity ephezulu isetshenziswa kangcono odakeni lukasimende.

8. Yiziphi izinto zokusetshenziswa eziyinhloko ze-hydroxypropyl methylcellulose (HPMC)?

—— Impendulo: Izinto zokusetshenziswa eziyinhloko ze-hydroxypropyl methylcellulose (HPMC): ukotini ocwengekile, i-methyl chloride, i-propylene oxide, nezinye izinto zokusetshenziswa, i-caustic soda, i-asidi, i-toluene, i-isopropanol, njll.

9. Uyini umsebenzi oyinhloko wokusetshenziswa kwe-HPMC ku-putty powder, futhi ingabe kwenzeka ngamakhemikhali?

——Impendulo: Ku-putty powder, i-HPMC idlala izindima ezintathu zokuqina, ukugcinwa kwamanzi nokwakha. Ukuqina: I-Cellulose ingajiywa ukuze imise futhi igcine umfaniswano wekhambi phezulu naphansi, futhi imelane nokuwohloka. 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. Ukwengeza amanzi ku-putty powder bese uyibeka odongeni ukusabela kwamakhemikhali, ngoba kwakhiwa izinto ezintsha. Uma ususa i-putty powder odongeni odongeni, uyigaye ibe yimpuphu, futhi uyisebenzise futhi, ngeke isebenze ngoba izinto ezintsha (i-calcium carbonate) zenziwe. ) futhi. Izingxenye eziyinhloko ze-ash calcium powder yilezi: ingxube ye-Ca(OH)2, i-CaO nenani elincane le-CaCO3, i-CaO+H2O=Ca(OH)2—Ca(OH)2+CO2=CaCO3↓+H2O Ash calcium isemanzini nasemoyeni Ngaphansi kwesenzo se-CO2, i-calcium carbonate ikhiqizwa, kuyilapho i-HPMC igcina amanzi kuphela, isiza ukusabela okungcono kwe-ash calcium, futhi ayihlanganyeli kunoma yikuphi ukusabela ngokwayo.

10. I-HPMC iyi-ether ye-cellulose engeyona i-ionic, ngakho-ke yini engeyona i-ionic?

——Impendulo: Ngokwemigomo ye-layman, okungezona ama-ion yizinto ezinganyunisi emanzini. I-ionization isho inqubo lapho i-electrolyte ihlukaniswa khona ibe ama-ion ashajiwe akwazi ukuhamba ngokukhululeka ku-solvent ethile (njengamanzi, utshwala). Isibonelo, i-sodium chloride (NaCl), usawoti esiwudla nsuku zonke, uncibilika emanzini bese u-ionize ukukhiqiza ama-ion sodium (Na+) ashajwa kahle nama-chloride ions (Cl) ashajwe ngokukhululeka. Okusho ukuthi, lapho i-HPMC ifakwa emanzini, ngeke ihlukane ibe ama-ion ashajiwe, kodwa ibe khona ngendlela yama-molecule.

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

——Impendulo: Izinga lokushisa lejeli le-HPMC lihlobene nokuqukethwe kwayo kwe-methoxy. Ukuncipha kokuqukethwe kwe-methoxy↓, kulapho izinga lokushisa lejeli liphezulu↑.

12. Ingabe kukhona ubudlelwano phakathi kokwehla kwe-putty powder ne-HPMC?

——Impendulo: Ukulahleka kwempuphu ye-putty powder kuhlobene kakhulu nekhwalithi ye-ash calcium, futhi akuhlangene kangako ne-HPMC. I-calcium ephansi ye-calcium empunga kanye nesilinganiso esingalungile se-CaO ne-Ca(OH)2 ku-calcium empunga kuzodala ukulahlekelwa kwempushana. Uma kunokuthile okuphathelene ne-HPMC, khona-ke uma i-HPMC inokugcinwa kwamanzi okungalungile, izophinde ibangele ukulahlekelwa kwempushana. Ngezizathu ezithile, sicela ubheke embuzweni wesi-9.

13. Uyini umehluko phakathi kohlobo olusheshayo lwamanzi abandayo kanye nohlobo oluncibilikayo lwe-hydroxypropyl methylcellulose ohlelweni lokukhiqiza?

——Impendulo: Uhlobo olusheshayo lwamanzi abandayo lwe-HPMC luphathwa phezulu nge-glyoxal. Ihlakazeka ngokushesha emanzini abandayo, kodwa ayincibiliki 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.

14. Liyini iphunga le-hydroxypropyl methylcellulose (HPMC)?

——Impendulo: I-HPMC ekhiqizwa indlela yokuncibilikisa isebenzisa i-toluene ne-isopropanol njengezincibilikisi. Uma ukugeza kungalungile kakhulu, kuzoba nephunga elisele.

15. Ungakhetha kanjani i-hydroxypropyl methylcellulose (HPMC) efanelekile ngezinhloso ezahlukene?

——Impendulo: Ukusetshenziswa kwe-putty powder: izidingo ziphansi, futhi i-viscosity yi-100,000, eyanele. Okubalulekile wukugcina amanzi kahle. Ukusetshenziswa kodaka: izidingo eziphakeme, i-viscosity ephezulu, i-150,000 ingcono. Ukusetshenziswa kweglue: imikhiqizo esheshayo ene-viscosity ephezulu iyadingeka.

16. Siyini isibizo se-hydroxypropyl methylcellulose?

——Impendulo: Hydroxypropyl Methyl Cellulose, IsiNgisi: Hydroxypropyl Methyl Cellulose Isifinyezo: HPMC noma MHPC Isibizo: Hypromellose; i-cellulose hydroxypropyl methyl ether; I-Hypromellose, i-Cellulose, i-2-hydroxypropylmethyl Cellulose ether. I-Cellulose hydroxypropyl methyl ether Hyprolose.

17. Ukusetshenziswa kwe-HPMC ku-putty powder, yisiphi isizathu sama-bubbles ku-putty powder?

——Impendulo: Ku-putty powder, i-HPMC idlala izindima ezintathu zokuqina, ukugcinwa kwamanzi nokwakha. Ungabambi iqhaza kunoma yikuphi ukusabela. Izizathu zamabhamuza: 1. Faka amanzi amaningi kakhulu. 2. Ungqimba olungezansi alomile, vele uhlubule olunye ungqimba phezulu, futhi kulula ukucweba.

18. Iyini ifomula ye-putty powder yezindonga zangaphakathi nezangaphandle?

——Impendulo: I-putty powder yezindonga zangaphakathi: i-calcium enzima 800KG grey calcium 150KG (i-starch ether, eluhlaza okotshani, i-pentagentite, i-citric acid, i-polyacrylamide, njll. ingangezwa ngokufanele)

I-putty powder yangaphandle: usimende 350KG i-calcium esindayo 500KG isihlabathi se-quartz 150KG i-latex powder 8-12KG i-cellulose ether 3KG isitashi ether 0.5KG i-wood fiber 2KG

19. Uyini umehluko phakathi kwe-HPMC ne-MC?

——Impendulo: I-MC i-methyl cellulose, eyenziwe nge-cellulose ether ngokwelapha ukotini ocolisisiwe nge-alkali, kusetshenziswa i-methane chloride njenge-etherification agent, futhi idlula ochungechungeni lokusabela. Ngokuvamile, izinga lokushintsha lingu-1.6~2.0, futhi ukunyibilika nakho kuhlukile ngamazinga ahlukene okushintsha. Kungokwe-non-ionic cellulose ether.

(1) Ukugcinwa kwamanzi kwe-methyl cellulose 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 lokwengeza linomthelela omkhulu kakhulu ekugcinweni kwamanzi, futhi izinga le-viscosity alilingani ngokuqondile nezinga lokugcinwa kwamanzi. Izinga lokuhlakazeka lincike kakhulu ezingeni lokuguqulwa kwendawo yezinhlayiya ze-cellulose kanye nokucoleka kwezinhlayiyana. 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 le-pH=3~12. Inokuhambisana okuhle nesitashi, i-guar gum, njll kanye nama-surfactants amaningi. Lapho izinga lokushisa lifinyelela izinga lokushisa le-gelation, i-gelation iyenzeka.

(3) Ukushintsha kwezinga lokushisa kuzothinta kakhulu izinga lokugcinwa kwamanzi e-methyl cellulose. Ngokuvamile, lapho izinga lokushisa liphezulu, kuba kubi nakakhulu ukugcinwa kwamanzi. Uma izinga lokushisa lodaka lidlula i-40 ° C, ukugcinwa kwamanzi kwe-methyl cellulose kuzoncishiswa kakhulu, okuthinta kakhulu ukwakhiwa kodaka.

(4) I-Methyl cellulose inomthelela omkhulu ekwakhiweni nasekunamatheleni kodaka. Igama elithi “adhesion” lapha libhekisela emandleni okunamathela azwakala phakathi kwethuluzi lokufaka isicelo lesisebenzi kanye ne-substrate yodonga, okungukuthi, ukumelana ne-shear kodaka. I-adhesiveness iphakeme, ukumelana kwe-shear kodaka kukhulu, futhi amandla adingwa ngabasebenzi ngesikhathi sokusebenzisa nawo makhulu, futhi ukusebenza kokwakhiwa kodaka kumpofu. I-Methyl cellulose adhesion isezingeni elilinganiselwe emikhiqizweni ye-cellulose ether.

I-HPMC iyi-hydroxypropyl methylcellulose, okuyi-ether engeyona i-ionic cellulose eyenziwe ngokotini ocolisisiwe ngemva kokwenziwa kwe-alkalization, kusetshenziswa i-propylene oxide ne-methyl chloride njengama-etherification agents, futhi ngochungechunge lokusabela. Izinga lokushintsha ngokuvamile liyi-1.2 ~ 2.0. Izakhiwo zayo zihlukile ngenxa yezilinganiso ezihlukene zokuqukethwe kwe-methoxyl nokuqukethwe kwe-hydroxypropyl.

(1) IHydroxypropyl methylcellulose incibilika kalula emanzini abandayo, futhi izohlangabezana nobunzima ekuncibilikeni emanzini ashisayo. Kodwa izinga lokushisa layo le-gelation emanzini ashisayo liphakeme kakhulu kunalelo le-methyl cellulose. I-solubility emanzini abandayo nayo ithuthuke kakhulu uma iqhathaniswa ne-methyl cellulose.

(2) I-Hydroxypropyl methylcellulose izinzile ku-asidi ne-alkali, futhi isisombululo sayo esinamanzi sizinzile kakhulu ebangeni le-pH = 2 ~ 12. I-Caustic soda namanzi e-lime anethonya elincane ekusebenzeni kwawo, kodwa i-alkali ingasheshisa ukuchithwa kwayo futhi ikhulise ukubukeka kwayo. IHydroxypropyl methylcellulose izinzile kusawoti ovamile, kodwa lapho ukuhlangana kwesixazululo sikasawoti kuphezulu, i-viscosity ye-hydroxypropyl methylcellulose solution ivame ukwanda.

(3) I-Hydroxypropyl methylcellulose ingaxutshwa nezinhlanganisela ze-polymer ezincibilika emanzini ukuze zenze isisombululo esifana nese-viscosity esiphezulu. Okufana ne-polyvinyl alcohol, isitashi ether, ushingamu wemifino, njll.

(4) Ukunamathela kwe-hydroxypropyl methylcellulose ekwakhiweni kodaka kungaphezulu kwalokho kwe-methylcellulose.

(5) I-Hydroxypropyl methylcellulose inokumelana ne-enzyme okungcono kune-methylcellulose, futhi isisombululo sayo mancane amathuba okuthi sonakaliswe ama-enzyme kune-methylcellulose.

20. Yini okufanele inakwe ekusetshenzisweni kwangempela kobudlelwane phakathi kwe-viscosity kanye nezinga lokushisa le-hydroxypropyl methylcellulose?

——Impendulo: I-viscosity ye-HPMC ilingana ngokuphambene nezinga lokushisa, okusho ukuthi, i-viscosity iyanda njengoba izinga lokushisa lincipha. I-viscosity yomkhiqizo esivame ukubhekisela kuwo ibhekisela kumphumela wokuhlolwa wesisombululo sawo samanzi esingu-2% ezingeni lokushisa elingu-20 degrees Celsius.

Ekusetshenzisweni okusebenzayo, kufanele kuqashelwe ukuthi ezindaweni ezinomehluko omkhulu wokushisa phakathi kwehlobo nobusika, kunconywa ukusebenzisa i-viscosity ephansi kakhulu ebusika, evumelana kakhulu nokwakhiwa. Uma kungenjalo, lapho izinga lokushisa liphansi, i-viscosity ye-cellulose izokhula, futhi ukuzwa kwesandla kuyoba nzima lapho kukhuhla.

I-viscosity ephakathi: 75000-100000 ikakhulukazi esetshenziselwa i-putty

Isizathu: ukugcinwa kahle kwamanzi

I-viscosity ephezulu: 150000-200000 Ikakhulu isetshenziselwa i-polystyrene izinhlayiyana ezishisayo zokufakwa kwe-rubber powder kanye ne-vitrified microbead thermal insulation mortar.

Isizathu: I-viscosity iphezulu, udaka akulula ukuwa, ukugoqa, futhi ukwakhiwa kuyathuthukiswa.

Kodwa ngokuvamile, ukuphakama kwe-viscosity, ukugcinwa kwamanzi kangcono. Ngakho-ke, uma kucatshangelwa izindleko, amafekthri amaningi e-powder mortar eyomile ashintsha i-cellulose ye-viscosity ephakathi nendawo (20000-40000) ne-medium-viscosity cellulose (20000-40000) ukunciphisa inani lokuhlanganisa.


Isikhathi sokuthumela: Nov-17-2022
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