Focus on Cellulose ethers

Iimpendulo kwimibuzo malunga ne-hydroxypropyl methylcellulose

1. Yintoni eyona nto isetyenziswayo ye-hydroxypropyl methylcellulose (HPMC)?

——Impendulo: I-HPMC isetyenziswa kakhulu kwizinto zokwakha, iingubo, iintlaka zokwenziwa, iiseramikhi, amayeza, ukutya, amalaphu, ezolimo, izithambiso, icuba kunye namanye amashishini. I-HPMC inokohlulwa ibe: ibakala lolwakhiwo, ibakala lokutya kunye nebakala lamayeza ngokokusetyenziswa. Okwangoku, uninzi lweemveliso zasekhaya zikumgangatho wokwakha. Kwibakala lokwakha, i-putty powder isetyenziswe kwisixa esikhulu, malunga ne-90% isetyenziselwa i-putty powder, kwaye intsalela isetyenziselwa udaka lwesamente kunye neglue.

2. Kukho iintlobo ezininzi ze-hydroxypropyl methylcellulose (HPMC), kwaye yintoni umahluko ekusebenziseni kwabo?

——Impendulo: I-HPMC inokohlulwa ibe uhlobo olukhawulezileyo kunye nohlobo lokuchithwa okushushu. Imveliso yohlobo olukhawulezayo isasazeka ngokukhawuleza emanzini abandayo kwaye iyanyamalala emanzini. Ngeli xesha, i-liquid ayinayo i-viscosity, kuba i-HPMC ihlakazekile kuphela emanzini ngaphandle kokuchithwa kwangempela. Malunga nemizuzu emi-2, i-viscosity yolwelo iyanda ngokuthe ngcembe, yenze i-colloid ebonakalayo ebonakalayo. Iimveliso ezincibilikisiweyo ezishushu, xa zidibene namanzi abandayo, ziyakwazi ukusasazeka ngokukhawuleza emanzini ashushu kwaye zinyamalale emanzini ashushu. Xa iqondo lobushushu lehla ukuya kwiqondo elithile lobushushu, i-viscosity iya kubonakala kancinane ide yenze i-colloid ebonakalayo ebonakalayo. Uhlobo lwe-hot-melt lunokusetyenziswa kuphela kwi-putty powder kunye nodaka. Kwiglue yolwelo kunye nepeyinti, kuya kubakho i-grouping phenomenon kwaye ayinakusetyenziswa. Uhlobo olukhawulezileyo lunoluhlu olubanzi lwezicelo. Ingasetyenziselwa kwi-putty powder kunye nodaka, kunye neglue yamanzi kunye nepeyinti, ngaphandle kokuchasana.

3. Ziziphi iindlela zokuchithwa kwe-hydroxypropyl methylcellulose (HPMC)?

——Impendulo: Indlela yokuchithwa kwamanzi ashushu: Ekubeni i-HPMC inganyibiliki emanzini ashushu, i-HPMC inokusasazwa ngokulinganayo kumanzi ashushu kwinqanaba lokuqala, ize inyibilike ngokukhawuleza xa ipholisa. Iindlela ezimbini eziqhelekileyo zichazwa ngolu hlobo lulandelayo:

1) Beka umlinganiselo ofunekayo wamanzi ashushu kwisikhongozeli kwaye ufudumale ukuya kuma-70°C. I-hydroxypropyl methylcellulose yongezwa ngokuthe ngcembe phantsi kokuvuselela okucothayo, ekuqaleni i-HPMC yadada phezu kwamanzi, kwaye ngokuthe ngcembe yenze i-slurry, eyapholiswa phantsi kokuvuselela.

2), yongeza i-1/3 okanye i-2/3 yomthamo ofunekayo wamanzi kwisitya, kwaye ushushu ube ngu-70 ° C, usasaze i-HPMC ngokwendlela ye-1), kwaye ulungiselele udaka lwamanzi ashushu; uze udibanise umlinganiselo oseleyo wamanzi abandayo kwi-slurry yamanzi ashushu, umxube wapholiswa emva kokuvuselela.
Indlela yokuxuba umgubo: xuba i-HPMC yomgubo kunye nesixa esikhulu sezinye izinto ezinomgubo, xuba ngokucokisekileyo kunye nomxube, uze wongeze amanzi ukuze unyibilike, emva koko i-HPMC inokunyibilika ngeli xesha ngaphandle kokudibanisa, kuba kukho i-HPMC encinci kuphela kuyo yonke into encinci. ikona Powder, iya kunyibilika ngokukhawuleza xa udibana namanzi. ——Umgubo weputty kunye nabavelisi bodaka basebenzisa le ndlela. [I-Hydroxypropyl methylcellulose (HPMC) isetyenziswa njenge-thickener kunye ne-arhente yokugcina amanzi kwi-putty powder mortar.

4. Indlela yokugweba umgangatho we-hydroxypropyl methylcellulose (HPMC) ngokulula kunye ne-intuitively?

——Impendulo: (1) Ubumhlophe: Nangona ubumhlophe bungakwazi ukugqiba ukuba i-HPMC ilula ukuyisebenzisa, kwaye ukuba i-agent emhlophe yongezwa ngexesha lenkqubo yokuvelisa, iya kuchaphazela umgangatho wayo. Nangona kunjalo, uninzi lweemveliso ezilungileyo zinobumhlophe obuhle. (2) Ukulunga: Ukulunga kwe-HPMC ngokubanzi kune-80 mesh kunye ne-100 mesh, i-120 mesh ingaphantsi, kwaye uninzi lwe-HPMC eveliswe e-Hebei yi-80 mesh, kwaye i-fineness, ngokuthetha ngokubanzi, ingcono. (3) Ukuhanjiswa kokukhanya: faka i-hydroxypropyl methylcellulose (HPMC) emanzini ukwenza i-colloid ecacileyo, kwaye ukhangele ukukhanya kwayo. Okukhona ukuhanjiswa kokukhanya, kungcono, kubonisa ukuba kukho izinto ezinganyibilikiyo kangako kuyo. . Ukungeneka kwereactor ethe nkqo ngokuqhelekileyo kulungile, kwaye okwereactor ethe tye kubi, kodwa ayithethi ukuba umgangatho wereactor eme nkqo ungcono kunalowo wereactor ethe tye, kwaye kukho izinto ezininzi zokumisela umgangatho wemveliso. . (4) Umxhuzulane okhethekileyo: Okukhona umkhulu umxhuzulane othile, kokukhona unzima ngakumbi. Ubuncinci bukhulu, ngokuqhelekileyo ngenxa yokuba umxholo weqela le-hydroxypropyl kuwo uphezulu, kwaye umxholo weqela le-hydroxypropyl liphezulu, ukugcinwa kwamanzi kungcono.

5. Yintoni i-viscosity efanelekileyo ye-hydroxypropyl methylcellulose (HPMC)?

——Impendulo: I-Putty powder idla ngokuba yi-yuan eyi-100,000, kwaye iimfuno zodaka ziphezulu, kwaye i-yuan eyi-150,000 iyafuneka ukuze isetyenziswe lula. Ngaphezu koko, owona msebenzi ubalulekileyo we-HPMC kukugcina amanzi, kulandelwa kukuqina. Kwi-putty powder, ngokude nje ukugcinwa kwamanzi kulungile kwaye i-viscosity iphantsi (i-70,000-80,000), nayo inokwenzeka. Ngokuqinisekileyo, ukuphakama kwe-viscosity, ngcono ukugcinwa kwamanzi okuhambelanayo. Xa i-viscosity idlula i-100,000, i-viscosity iya kuchaphazela ukugcinwa kwamanzi. Akusekho kakhulu.

6. Ziziphi iimpawu eziphambili zezobugcisa ze-hydroxypropyl methylcellulose (HPMC)?

——Impendulo: Umxholo weHydroxypropyl kunye ne-viscosity, uninzi lwabasebenzisi banenkxalabo malunga nezi zalathisi zibini. Abo banomxholo ophezulu we-hydroxypropyl ngokubanzi banokugcinwa kwamanzi okungcono. Lowo une-viscosity ephezulu unokugcinwa kwamanzi okungcono, ngokumalunga (kungekhona ngokupheleleyo), kwaye lowo une-viscosity ephezulu isetyenziswe kangcono kwi-samente mortar.

7. Ziziphi ezona zixhobo ziphambili ze-hydroxypropyl methylcellulose (HPMC)?

—— Impendulo: Izinto eziphambili ze-hydroxypropyl methylcellulose (HPMC): i-cotton ecocekileyo, i-methyl chloride, i-propylene oxide, kunye nezinye izinto eziluhlaza, i-caustic soda, i-asidi, i-toluene, i-isopropanol, njl.

8. Yintoni umsebenzi oyintloko wokusetyenziswa kwe-HPMC kwi-putty powder, kwaye ngaba kwenzeka ngamakhemikhali?

--Impendulo: Kwi-putty powder, i-HPMC idlala iindima ezintathu zokuqina, ukugcinwa kwamanzi kunye nokwakhiwa. Ukutyebisa: Iselulosi inokujiya ukuze inqunyanyiswe kwaye igcine iyunifomu yesisombululo inyuka naphantsi, kwaye imelane nokudodobala. Ukugcinwa kwamanzi: yenza i-putty powder yome kancinci, kwaye uncedise i-calcium yothuthu ukuba isabele phantsi kwesenzo samanzi. Ukwakhiwa: I-Cellulose inefuthe lokuthambisa, elinokwenza ukuba i-putty powder ibe nokwakhiwa kakuhle. I-HPMC ayithathi nxaxheba kuyo nayiphi na intshukumo yeekhemikhali, kodwa idlala indima encedisayo kuphela. Ukongeza amanzi kwi-putty powder kunye nokuyibeka eludongeni kukusabela kweekhemikhali, kuba izinto ezintsha zenziwe. Ukuba ususa i-putty powder eludongeni eludongeni, ugaye ube ngumgubo, kwaye uyisebenzise kwakhona, ayiyi kusebenza ngenxa yokuba izinto ezintsha (i-calcium carbonate) zenziwe. ) nayo. Amacandelo aphambili omgubo we-ash calcium zezi: umxube weCa(OH)2, iCaO kunye nesixa esincinci seCaCO3, CaO+H2O=Ca(OH)2—Ca(OH)2+CO2=CaCO3↓+H2O Ash calcium emanzini nasemoyeni Ngaphantsi kwesenzo se-CO2, i-calcium carbonate yenziwe, ngelixa i-HPMC igcina amanzi kuphela, incedisa ukusabela okungcono kwe-ash calcium, kwaye ayithathi nxaxheba kuyo nayiphi na impendulo ngokwayo.

9. I-HPMC yi-ether ye-cellulose engekho i-ionic, ngoko ke yintoni i-non-ionic?

——Impendulo: Ngokwemigaqo ye-layman, i-non-ion zizinto ezingenzi ionize emanzini. Ionization ibhekisela kwinkqubo apho i-electrolyte idityaniswe kwii-ion ezihlawulisiweyo ezinokuhamba ngokukhululekile kwi-solvent ethile (njengamanzi, utywala). Ngokomzekelo, i-sodium chloride (NaCl), ityuwa esiyidla yonke imihla, inyibilika emanzini kwaye i-ionizes ukuvelisa i-ion ze-sodium ezihamba ngokukhululekileyo (Na +) ezihlawuliswa kakuhle kunye ne-chloride ion (Cl) ehlawuliswa kakubi. Oko kukuthi, xa i-HPMC ifakwe emanzini, ayiyi kuhlukana kwii-ion ezihlawuliswayo, kodwa zikhona ngendlela yeemolekyuli.

10. Yintoni ubushushu bejeli ye-hydroxypropyl methylcellulose enxulumene nayo?

——Impendulo: Ubushushu bejeli ye-HPMC inxulumene nomxholo wayo we-methoxy. Okukhona usezantsi umxholo we-methoxy↓, kokukhona uphezulu ubushushu bejeli.

11. Ngaba kukho ubudlelwane phakathi kokuhla kwe-putty powder kunye ne-HPMC?

--Impendulo: Ukulahlekelwa ngumgubo we-putty powder kuhambelana ikakhulu nomgangatho we-ash calcium, kwaye ayinanto encinci ne-HPMC. Umxholo ophantsi we-calcium we-gray calcium kunye nomlinganiselo ongafanelekanga we-CaO kunye ne-Ca (OH) i-2 kwi-gray calcium iya kubangela ukulahleka kwepowder. Ukuba inento yokwenza ne-HPMC, ngoko ukuba i-HPMC inokugcinwa kwamanzi okungahambi kakuhle, kuya kubangela ukulahlekelwa ngumgubo.

12. Uthini umahluko phakathi kohlobo olukhawulezayo lwamanzi abandayo kunye nohlobo oluyi-soluble olushushu lwe-hydroxypropyl methylcellulose kwinkqubo yokuvelisa?

——Impendulo: Uhlobo olukhawulezayo lwamanzi abandayo lwe-HPMC lunyangwa ngomphezulu nge-glyoxal, kwaye lusasazeka ngokukhawuleza kumanzi abandayo, kodwa alunyibiliki ngokwenene. Ichithwa kuphela xa i-viscosity inyuka. Iintlobo ezishushu ezinyibilikayo aziphathwa ngomphezulu nge-glyoxal. Ukuba inani le-glyoxal likhulu, ukusabalalisa kuya kukhawuleza, kodwa i-viscosity iya kwanda ngokukhawuleza, kwaye ukuba isixa sincinci, okuchaseneyo kuya kuba yinyani.

13. Yintoni ivumba le-hydroxypropyl methylcellulose (HPMC)?

——Impendulo: I-HPMC eveliswe yindlela yokunyibilikisa isebenzisa i-toluene kunye ne-isopropanol njengezinyibilikisi. Ukuba ukuhlamba akulunganga kakhulu, kuya kubakho ivumba elishiyekileyo.

14. Indlela yokukhetha i-hydroxypropyl methylcellulose (HPMC) efanelekileyo ngeenjongo ezahlukeneyo?

--Impendulo: Ukusetyenziswa kwe-putty powder: iimfuno ziphantsi, kwaye i-viscosity yi-100,000, eyaneleyo. Into ebalulekileyo kukugcina amanzi kakuhle. Ukusetyenziswa komdaka: iimfuno eziphezulu, i-viscosity ephezulu, i-150,000 ingcono. Ukusetyenziswa kweglue: iimveliso ezikhawulezayo ezine-viscosity ephezulu ziyafuneka.

15. Leliphi elinye igama le-hydroxypropyl methylcellulose?

——Impendulo: Hydroxypropyl Methyl Cellulose, IsiNgesi: Hydroxypropyl Methyl Cellulose Isifinyezo: HPMC okanye MHPC Alias: Hypromellose; i-cellulose hydroxypropyl methyl ether; I-Hypromellose, iSelulosi, i-2-hydroxypropyl methyl Cellulose ether. I-Cellulose hydroxypropyl methyl ether Hyprolose.

16. Ukusetyenziswa kwe-HPMC kwi-putty powder, yintoni isizathu se-bubbles kwi-putty powder?

--Impendulo: Kwi-putty powder, i-HPMC idlala iindima ezintathu zokuqina, ukugcinwa kwamanzi kunye nokwakhiwa. Musa ukuthatha inxaxheba kuzo naziphi na iimpendulo. Izizathu zamaqamza: 1. Beka amanzi amaninzi kakhulu. 2. Umaleko ongezantsi awusomile, vele ukhuphe enye ingqimba phezulu, kwaye kulula ukuphosa amagwebu.

17. Yintoni umahluko phakathi kwe-HPMC kunye ne-MC?

——Impendulo: I-MC yi-methyl cellulose, eyenziwe nge-cellulose ether ngokuphatha i-cotton ecocekileyo nge-alkali, isebenzisa i-methane chloride njenge-etherification agent, kwaye ihamba ngeendlela zokuphendula. Ngokubanzi, iqondo lokutshintsha liyi-1.6 ~ 2.0, kwaye ukunyibilika kwahluka ngokwamanqanaba okutshintsha. yeye-non-ionic cellulose ether.
(1) Ukugcinwa kwamanzi kwi-methyl cellulose kuxhomekeke kwisixa sokongeza, i-viscosity, i-particle fineness kunye neqondo lokuchithwa. Ngokuqhelekileyo, ukuba isixa esongezelelweyo sikhulu, i-fineness incinci, kwaye i-viscosity inkulu, izinga lokugcinwa kwamanzi liphezulu. Phakathi kwabo, inani lokongezelela linempembelelo enkulu kwizinga lokugcinwa kwamanzi, kwaye inqanaba le-viscosity alilingani ngokuthe ngqo kwinqanaba lokugcinwa kwamanzi. Izinga lokuchithwa ikakhulu lixhomekeke kwiqondo lokuguqulwa komphezulu we-cellulose particleness kunye ne-particle fineness. Phakathi kwezi zingentla ze-cellulose ethers, i-methyl cellulose kunye ne-hydroxypropyl methyl cellulose zinezinga eliphezulu lokugcina amanzi.
(2) I-Methylcellulose iyanyibilika emanzini abandayo, kwaye kuya kuba nzima ukuyinyibilika emanzini ashushu. Isisombululo saso samanzi sizinzile kakhulu kuluhlu lwe-pH = 3 ~ 12. Inokuhambelana kakuhle nestatshi, i-guar gum, njl. kunye nee-surfactants ezininzi. Xa iqondo lokushisa lifikelela kwiqondo lokushisa, i-gelation iyenzeka.
(3) Utshintsho kwiqondo lobushushu luya kuchaphazela kakhulu izinga lokugcinwa kwamanzi kwi-methyl cellulose. Ngokuqhelekileyo, okukhona ubushushu buphezulu, kokukhona ukugcinwa kwamanzi kubi. Ukuba ubushushu bomdaka budlula i-40 ° C, ukugcinwa kwamanzi kwe-methyl cellulose kuya kuncitshiswa kakhulu, kuchaphazela kakhulu ukwakhiwa kodaka.
(4) I-Methyl cellulose inempembelelo ebalulekileyo ekwakhiweni nasekunamatheleni komdaka. “Ukuncamathisela” apha kubhekisa kumandla okuncamathelisa okuvakala phakathi kwesixhobo sokufaka isicelo somsebenzi kunye nenxalenye yodonga, oko kukuthi, ukuxhathisa kokucheba kodaka. I-adhesiveness iphezulu, ukuxhathisa i-shear yodaka kukhulu, kwaye amandla afunwa ngabasebenzi kwinkqubo yokusetyenziswa nawo mkhulu, kwaye ukusebenza kokwakhiwa kodaka kubi. I-Methyl cellulose adhesion ikwinqanaba eliphakathi kwiimveliso ze-cellulose ether.

I-HPMC yi-hydroxypropyl methylcellulose, eyi-non-ionic cellulose exutywe ne-ether eyenziwe kwikotoni esulungekileyo emva kwe-alkalization, isebenzisa i-propylene oxide kunye ne-methyl chloride njengee-etherification agents, kunye noluhlu lweempendulo. Iqondo lokutshintshwa ngokubanzi yi-1.2 ~ 2.0. Iimpawu zayo zihluke ngenxa yemilinganiselo eyahlukeneyo yomxholo we-methoxyl kunye nomxholo we-hydroxypropyl.

(1) IHydroxypropyl methylcellulose inyibilika ngokulula emanzini abandayo, kwaye iya kudibana nobunzima ekunyibilikeni kumanzi ashushu. Kodwa ubushushu bayo be-gelation emanzini ashushu buphezulu kakhulu kune-methyl cellulose. Ukunyibilika kumanzi abandayo kuphuculwe kakhulu xa kuthelekiswa ne-methyl cellulose.
(2) I-viscosity ye-hydroxypropyl methylcellulose ihambelana nobunzima bayo be-molecular, kwaye ubukhulu be-molecular weight, buphezulu be-viscosity. Ubushushu buchaphazela i-viscosity yayo, njengoko izinga lokushisa linyuka, i-viscosity iyancipha. Nangona kunjalo, i-viscosity yayo ephezulu inefuthe eliphantsi lobushushu kune-methyl cellulose. Isisombululo sayo sizinzile xa sigcinwe kwiqondo lokushisa.
(3) I-Hydroxypropyl methylcellulose izinzile kwi-asidi kunye ne-alkali, kwaye isisombululo sayo samanzi sizinzileyo kakhulu kwi-pH = 2 ~ 12. I-Caustic soda kunye namanzi e-lime anempembelelo encinci ekusebenzeni kwayo, kodwa i-alkali inokukhawulezisa ukuchithwa kwayo kunye nokwandisa i-viscosity yayo. I-Hydroxypropyl methylcellulose izinzile kwiityuwa eziqhelekileyo, kodwa xa ukuxinwa kwesisombululo setyuwa kuphezulu, i-viscosity ye-hydroxypropyl methylcellulose isisombululo ivame ukunyuka.
(4) Ukugcinwa kwamanzi kwe-hydroxypropyl methylcellulose kuxhomekeke kwisixa sokongeza, i-viscosity, njl.
(5) I-Hydroxypropyl methylcellulose inokuxutywa kunye ne-polymer compounds e-soluble yamanzi ukuze yenze isisombululo esifanayo kunye ne-viscosity ephezulu. Okufana ne-polyvinyl alcohol, i-starch ether, i-gum yemifuno, njl.
(6) I-adhesion ye-hydroxypropyl methylcellulose kwisakhiwo sodaka iphezulu kune-methylcellulose.
(7) I-Hydroxypropyl methylcellulose inokumelana ne-enzyme engcono kune-methylcellulose, kwaye isisombululo sayo asikwazi ukuthotywa yi-enzymes kune-methylcellulose.

18. Yintoni ekufuneka iqwalaselwe kwisicelo sokwenene sobudlelwane phakathi kwe-viscosity kunye nobushushu be-HPMC?

——Impendulo: I-viscosity ye-HPMC ihambelana ngokungafaniyo neqondo lokushisa, oko kukuthi, i-viscosity iyanda njengoko ubushushu buyancipha. I-viscosity yemveliso esidla ngokubhekisela kuyo ibhekiselele kwisiphumo sovavanyo lwesisombululo sayo se-aqueous ye-2% kwiqondo lokushisa lama-20 degrees Celsius.

Kwizicelo eziphathekayo, kufuneka kuqatshelwe ukuba kwiindawo ezinomahluko omkhulu weqondo lokushisa phakathi kwehlobo nobusika, kucetyiswa ukuba kusetyenziswe i-viscosity ephantsi kakhulu ebusika, ehambelana nokwakhiwa. Ngaphandle koko, xa iqondo lokushisa liphantsi, i-viscosity ye-cellulose iya kwanda, kwaye ukuvakalelwa kwesandla kuya kuba nzima xa kukhuhla.

I-viscosity ephakathi: 75000-100000 Isetyenziswa kakhulu kwi-putty.

Isizathu: ukugcinwa kakuhle kwamanzi.

I-viscosity ephezulu: 150000-200000 Ikakhulu isetyenziselwa i-polystyrene particle thermal insulation mortar glue powder and vitrified microbead thermal insulation mortar.
Isizathu: i-viscosity ephezulu, udaka alulula ukuwa, ukuxhoma, kunye nokuphucula ukwakhiwa.

Kodwa xa sithetha ngokubanzi, okukhona i-viscosity iphezulu, kokukhona kungcono ukugcinwa kwamanzi. Ngoko ke, ngokuqwalasela indleko, iifektri ezininzi zodaka ezinomileyo zithatha indawo ye-cellulose ye-viscosity ephakathi kunye nephantsi (20000-40000) kunye ne-medium-viscosity cellulose (20000-40000) ukunciphisa inani lokongezwa. .


Ixesha lokuposa: Nov-21-2022
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