Ukusebenzisana kweekhemikhali phakathi kwe-HPMC kunye nezixhobo zesamente

I-Hydroxypropyl methylcellulose (HPMC) yi-ether ye-cellulose esetyenziswa ngokubanzi kwizinto zokwakha ngenxa yeempawu zayo ezizodwa ezifana nokugcinwa kwamanzi, amandla okuqina, kunye nokunamathela. Kwiinkqubo zesamente, i-HPMC isebenza ngeenjongo ezahlukeneyo, kubandakanywa nokuphucula ukusebenza, ukuphucula ukunamathela, kunye nokulawula inkqubo yokufakwa kwamanzi.

Iimathiriyeli zesamente zidlala indima ebalulekileyo kulwakhiwo, zibonelela ngomqolo wolwakhiwo kwizicelo ezahlukeneyo zeziseko zophuhliso. Kwiminyaka yakutshanje, kubekho umdla okhulayo wokuguqula iinkqubo zesamente ukuze zihlangabezane neemfuno ezithile zokusebenza, ezifana nokusebenza okuphuculweyo, ukuqina okuphuculweyo, kunye nokunciphisa impembelelo yokusingqongileyo. IHydroxypropyl methylcellulose (HPMC) yenye yezongezo ezisetyenziswa ngokuqhelekileyo kwimixube yesamente ngenxa yeempawu zayo eziguquguqukayo kunye nokuhambelana nesamente.

1. Iipropathi zeHydroxypropyl Methylcellulose (HPMC)

I-HPMC yi-ether yeselulosi ephuma kwiselulosi yendalo ngokuguqulwa kweekhemikhali. Inezakhiwo ezininzi ezinqwenelekayo kwizicelo zokwakha, kubandakanya:

Ukugcinwa kwamanzi: I-HPMC inokufunxa kwaye igcine isixa esikhulu samanzi, esinceda ukunqanda ukuvela komphunga ngokukhawuleza kunye nokugcina iimeko ezifanelekileyo ze-hydration kwiinkqubo ze-cementitious.

Ukuqina kwamandla: I-HPMC inika i-viscosity kwimixube yesamente, iphucula ukusebenza kwayo kunye nokunciphisa ulwahlulo kunye nokopha.
Ukubambelela: I-HPMC iphucula ukuncamathelwa kwezixhobo zesamente kwii-substrates ezahlukeneyo, okukhokelela ekuphuculweni kokuqina kwebhondi kunye nokuqina.
Ukuzinza kweMichiza: I-HPMC ixhathisa ukuthotywa kweekhemikhali kwiindawo ze-alkaline, iyenza ilungele ukusetyenziswa kwiinkqubo ezisekelwe kwisamente.

2.IiNdibaniselwano zeMichiza phakathi kwe-HPMC kunye neMathiriyeli yeCementitious

Ukusebenzisana phakathi kwe-HPMC kunye nezixhobo ze-cementitious kwenzeka kumanqanaba amaninzi, kubandakanywa i-adsorption yomzimba, ukuphendula kweekhemikhali, kunye nokuguqulwa kwe-microstructural. Olu nxibelelwano lunefuthe kwi-hydration kinetics, uphuhliso lwe-microstructure, iipropathi zoomatshini, kunye nokuqina kweziphumo ze-cementitious composites.

3.I-Adsorption yePhysical

Iimolekyuli ze-HPMC zinokungena ngokwasemzimbeni kumphezulu wamasuntswana esamente ngokudityaniswa kwe-hydrogen kunye namandla kaVan der Waals. Le nkqubo ye-adsorption ithonywa yimiba efana nommandla kunye nentlawulo yeengqungquthela ze-samente, kunye nesisindo se-molecular and concentration ye-HPMC kwisisombululo. I-adsorption ebonakalayo ye-HPMC inceda ukuphucula ukusasazwa kwamasuntswana esamente emanzini, okukhokelela ekusebenzeni okuphuculweyo kunye nokunciphisa imfuno yamanzi kwimixube yesamente.

4.Iimpendulo zeMichiza

I-HPMC inokuchaphazeleka kwiikhemikhali kunye namalungu emathiriyeli yesamente, ngakumbi nge-calcium ion ekhutshwa ngexesha lokugalelwa kwesamente. Amaqela e-hydroxyl (-OH) akhoyo kwiimolekyuli ze-HPMC angasabela kunye ne-calcium ions (Ca2 +) ukwenza i-calcium complexes, enokuthi ifake isandla ekumiseni nasekuqiniseni iinkqubo ze-cementitious. Ukongezelela, i-HPMC inokusebenzisana nezinye iimveliso ze-cement hydration, ezifana ne-calcium silicate hydrates (CSH), ngokusebenzisa i-hydrogen bonding kunye neenkqubo zokutshintshiselana kwe-ion, ezichaphazela i-microstructure kunye neempawu zomatshini ze-samente eqinile.

5.Uhlengahlengiso lweMicrostructural

Ubukho be-HPMC kwiinkqubo ze-cementitious bunokubangela ukuguqulwa kwe-microstructural, kubandakanywa utshintsho kwisakhiwo se-pore, ukusabalalisa ubungakanani bepore, kunye ne-hydration iimveliso morphology. Iimolekyuli ze-HPMC zisebenza njengezizalisi zepore kunye neendawo ze-nucleation kwiimveliso ze-hydration, ezikhokelela kulwakhiwo lwe-microstructures oluxineneyo olunemingxuma ecolekileyo kunye nokuhanjiswa okufanayo kweemveliso ze-hydration. Olu hlengahlengiso lwe-microstructural lunegalelo ekuphuculeni iimpawu zomatshini, njengamandla oxinzelelo, amandla okuguquguquka, kunye nokuqina, kwe-HPMC-modified cementitious materials.

6.Iimpembelelo kwiiPropati kunye nokuSebenza

Ukusebenzisana kweekhemikhali phakathi kwe-HPMC kunye nezixhobo zesamente zineempembelelo ezibalulekileyo kwiipropati kunye nokusebenza kweemveliso ezisekelwe kwisamente. Ezi ziphumo ziquka:

7.Ukwandiswa kokuSebenza

I-HPMC iphucula ukusebenza kwemixube yesamente ngo

ukunciphisa imfuno yamanzi, ukuqinisa ukuhambelana, kunye nokulawula ukopha kunye nokwahlula. Iipropati ezityebileyo kunye nokugcina amanzi ze-HPMC zivumela ukuhamba kakuhle kunye nokumpompa kwemixube yekhonkrithi, ukuququzelela imisebenzi yolwakhiwo kunye nokufezekisa ukugqitywa komphezulu ofunekayo.

8.Ukulawulwa kwe-Hydration Kinetics

I-HPMC inefuthe kwi-hydration kinetics yeenkqubo ze-cementitious ngokulawula ukufumaneka kwamanzi kunye ne-ion, kunye ne-nucleation kunye nokukhula kweemveliso ze-hydration. Ubukho be-HPMC bungakwazi ukulibazisa okanye ukukhawulezisa inkqubo yokufakwa kwamanzi ngokuxhomekeke kwizinto ezifana nohlobo, ugxininiso, kunye nobunzima bemolekyuli ye-HPMC, kunye neemeko zokunyanga.

9. Ukuphuculwa kweePropati zoomatshini

Izixhobo zesamente ezilungisiweyo zeHPMC zibonisa iipropathi eziphuculweyo zoomatshini xa kuthelekiswa neenkqubo ezicacileyo ezisekwe kwisamente. Ukuguqulwa kwe-microstructural eyenziwa yi-HPMC kubangele amandla aphezulu oxinzelelo, amandla okuguquguquka, kunye nokuqina, kunye nokuphucula ukuchasana nokuqhekeka kunye nokuguqulwa phantsi komthwalo.

10.Ukomelezwa koZinzo

I-HPMC yongeza ukuqina kwemathiriyeli yesamente ngokuphucula ukuxhathisa kwazo kwiindlela ezahlukeneyo zokuthotywa, kubandakanya imijikelo yokunyibilika komkhenkce, uhlaselo lwekhemikhali, kunye nekhabhoni. Ubume be-microstructure exineneyo kunye nokuncitshiswa kokungena kweenkqubo zesamente ezilungisiweyo ze-HPMC zinegalelo ekwandeni kokuchasa ekungeneni kwezinto ezicimayo kunye nobomi benkonzo obude.

IHydroxypropyl methylcellulose (HPMC) idlala indima ebalulekileyo ekuguquleni iipropati kunye nokusebenza kwemathiriyeli yesamente ngokusebenzisana kweekhemikhali kunye namalungu esamente. I-adsorption yomzimba, ukuphendulwa kweekhemikhali, kunye nokuguqulwa kwe-microstructural eyenziwa yi-HPMC kunempembelelo ekusebenzeni, i-hydration kinetics, iipropathi zoomatshini, kunye nokuqina kweemveliso ezisekelwe kwisamente. Ukuqonda olu nxibelelwano kubalulekile ekwandiseni ukwenziwa kwezixhobo zesamente ezilungisiweyo ze-HPMC ukwenzela izicelo ezahlukeneyo zokwakha, ukusuka kwikhonkrithi yesiqhelo ukuya kwiindonga ezikhethekileyo kunye neegrouts. Uphando olongezelelweyo luyafuneka ukuphonononga iindlela ezintsonkothileyo ezisisiseko sokusebenzisana phakathi kwe-HPMC kunye nezixhobo zesamente kunye nokuphuhlisa izongezo ezisekelwe kwi-HPMC eziphambili ezineempawu ezilungiselelwe iimfuno ezithile zokwakha.