IHydroxypropyl Methylcellulose (HPMC)kwayeI-Methyl Hydroxyethyl Cellulose (MHEC)zii-ether ezimbini ze-cellulose ezisetyenziswa kakhulu ezivela kwi-cellulose yendalo, i-polymer efumaneka kwiindonga zeseli zezityalo. Ezi khompawundi ziguqulwa ngeenkqubo zeekhemikhali ukuvelisa izinto ezibonisa ukuqina, ukugcinwa kwamanzi, ukwakheka kwefilimu, kunye neempawu zokubopha. Nangona zabelana ngeempawu ezifanayo zokusebenza, zahlukile kwisakhiwo seekhemikhali, iimpawu, usetyenziso, kunye nokusebenza phantsi kweemeko ezahlukeneyo.

1. Ulwakhiwo lweekhemikhali kunye nolwakhiwo lwazo

I-HPMC (iHydroxypropyl Methylcellulose)

I-HPMC yi-non-ionic cellulose ether eveliswa yi-reactioning cellulose nge-methyl chloride kunye ne-propylene oxide. Amaqela e-hydroxyl (-OH) kumqolo we-cellulose atshintshwe ngokuyinxenye ngamaqela e-methoxy (-OCH₃) kunye ne-hydroxypropyl (-CH₂CHOHCH₃).

I-MHEC (iMethyl Hydroxyethyl Cellulose)

Kwelinye icala, i-MHEC yenziwa ngokuphendula i-cellulose nge-ethylene oxide kunye ne-methyl chloride. Oku kwazisa amaqela e-methoxy (-OCH₃) kunye ne-hydroxyethyl (-CH₂CH₂OH).

Umahluko oPhambili kwiSakhiwo:

I-HPMC inee-substituents ze-hydroxypropyl, ngelixa i-MHEC inee-groups ze-hydroxyethyl.

Uhlobo lweqela le-ether luchaphazela ukunyibilika kwamanzi, ukunyibilika, kunye nokuziphatha kwe-thermal gelation.

Indlela Yokuqaqamba: Zombini i-HPMC kunye ne-MHEC zifumaneka kwiindidi ezahlukeneyo ze-viscosity, ezenzelwe ukusetyenziswa ezahlukeneyo. Nangona kunjalo, ulwakhiwo lwe-molecular luchaphazela indlela i-viscosity eziphatha ngayo kwisisombululo. I-HPMC idla ngokunika i-thermal gelation engcono kunye ne-viscosity engaguqukiyo kuluhlu olubanzi lwe-pH.

3. Iimpawu Zokusebenza

Ukugcinwa Kwamanzi:

Zombini ezi zinto zibalaseleyo ekugcinweni kwamanzi, nto leyo ibalulekileyo kwiinkqubo ezisekwe kwisamente nakwi-gypsum. Nangona kunjalo, i-HPMC ngokubanzi ibonelela ngokugcinwa kwamanzi okungcono kancinci, nto leyo eyenza ukuba ibe lukhetho olukhethwayo kwiimortars ezomileyo, ii-adhesives zethayile, kunye nee-render.

Isiphumo sokuqina:

I-MHEC idla ngokuvelisa i-viscosity ethambileyo nezinzileyo ngakumbi kwizisombululo zamanzi, nto leyo eyenza ukuba ibe yinto efunekayo xa kufuneka ukuhamba rhoqo nokusebenza kakuhle.

Ukwenziwa kweFilimu:

I-HPMC idla ngokwenza iifilimu eziguquguqukayo nezibonakalayo, ngelixa i-MHEC isenza iifilimu ezithambileyo. Olu mahluko luchaphazela ukusetyenziswa kwezinto zokugquma umphezulu kunye nezinto zokuncamathelisa.

Ukufakwa kwe-Thermal Gelation:

I-HPMC ingena kwi-thermal gelation, yenze i-gel xa ifudunyezwa. I-MHEC ikwabonisa i-thermal gelation, kodwa kancinci. Le mpawu ibaluleke kakhulu kwiindlela zokusetyenziswa kwamayeza nokutya apho kufuneka kubekho umqobo okanye ubume be-gel.

4. Izicelo

Zombini i-HPMC kunye ne-MHEC zisetyenziswa kuluhlu olubanzi lwamashishini. Nangona kunjalo, iimpawu ezithile zokusebenza zenza enye ifaneleke ngakumbi kunenye kwizicelo ezithile.

4.1 Ishishini lokwakha

I-HPMC:

Izincamathelisi zethayile

Iiplasta kunye neerender ezisekelwe kwisamente

Iikhompawundi ezizilinganisayo

Iinkqubo zokugqiba ubushushu bangaphandle (i-EIFS)

Iiplasta ezenziwe ngegypsum

Iingenelo kulwakhiwo:

Ukugcinwa kwamanzi amaninzi

Ixesha elingcono lokuvula izinto zokuncamathelisa

Ukuphucula ukusebenza

I-MHEC:

Iijasi ezinamafutha aphantsi

Iplasta ekhaphukhaphu

Izincamathelisi zephepha lodonga

Iikhompawundi ezidibeneyo ezilungele ukuxubana

Iingenelo kulwakhiwo:

Ukuzinza okugudileyo

Iimpawu zokuncamathela ezilungileyo

Indlela elula yokuxuba

4.2 Amayeza

I-HPMC:

Isetyenziswa njenge-binder kunye ne-arhente yokugquma ifilimu kwiipilisi

Iinkqubo zokukhululwa kwamayeza ezilawulwayo

Amaconsi amehlo kunye neejeli zamehlo

I-MHEC:

Ayisetyenziswa rhoqo ngenxa yeempawu zayo eziphantsi ze-gelation, kodwa isasebenza kwi:

Ukumiswa ngomlomo

Iifomyula zezihloko

4.3 Iipeyinti kunye neengubo

I-MHEC:

Idla ngokukhethwa kwiipeyinti ezisekelwe emanzini ngenxa yendlela ezisebenza ngayo ezingezoplastiki (ukucheba)

Iphucula ukuxukuxa kwebhrashi kunye nokusetyenziswa okugudileyo

I-HPMC:

Ikwasetyenziswa nakwiipeyinti, ingakumbi xa kufuneka amanzi amaninzi okanye iipropati zokucoca i-gel ephezulu.

D. Izinto zokucoca kunye nokhathalelo lobuqu

I-HPMC:

Iishampoo, iiconditioner, kunye neelotion

Isebenza njengesithambisi kunye nesiqinisi

I-MHEC:

Iisepha zezandla kunye neempahla zokuhlamba umzimba

Ikhethwa ngenxa yokucaca okuphuculweyo kunye nokulula kokwenziwa kwayo

4.4 Ishishini lokutya

I-HPMC:

Ivunyiwe njengesongezelelo sokutya (E464)

Isetyenziswa kwiikhaphu zemifuno, kwiimveliso zebhakari, nakwiisosi ezixutyiweyo

Inceda ekubunjweni nasekuzinzeni

I-MHEC:

Ayivunywanga ngokubanzi ukuba isetyenziswe ekutyeni; ukusetyenziswa kwayo kulinganiselwe.

5. Imiba yoBume beNdalo kunye neMithetho

Zombini i-HPMC kunye ne-MHEC azinabungozi, ziyabola, kwaye azinabungozi kwi-ionic, nto leyo eyenza zikhuseleke ukusetyenziswa kwiimveliso ezininzi. Nangona kunjalo:

I-HPMC ivunyiwe ngokubanzi ukuba isetyenziswe kumayeza nasekutyeni.

I-MHEC isetyenziswa kakhulu kwizicelo zoshishino kunye nezobuhle.

6. Ixabiso kunye nokuFumaneka

I-MHEC ngokubanzi ixabisa kancinci kune-HPMC ngenxa yenkqubo yayo yokuvelisa elula kancinci kunye nemfuno ephantsi kwiimarike zamayeza nezokutya. Nangona kunjalo, ububanzi besicelo se-HPMC, ingakumbi kumashishini alawulwayo, buqinisekisa ixabiso layo eliphezulu.

Kwiinkqubo ezisebenza kakuhle njengezincamathelisi zethayile okanye iirendi apho kufuneka khona ukugcinwa kwamanzi amaninzi kunye nokunamathela, i-HPMC iyathandwa. Ngokwahlukileyo koko, ukuze kusetyenziswe kakuhle kwaye kube lula ukuxuba, njengakwii-joint compounds okanye ii-wall putty, i-MHEC inokuba luncedo ngakumbi.

NgelixaI-HPMCkwayeI-MHECzii-cellulose ethers ezifanayo ngokweekhemikhali, amaqela azo ahlukeneyo athatha indawo (i-hydroxypropyl kwi-HPMC vs. i-hydroxyethyl kwi-MHEC) zikhokelela kumahluko abalulekileyo ekusebenzeni, ngakumbi ngokubhekiselele kwi-thermal gelation, ukugcinwa kwamanzi, ukwakheka kwefilimu, kunye nokuhambelana nokusetyenziswa.