Umphumela we-HPMC one-viscosities ehlukene ekusebenzeni okukhonkolo

I-Hydroxypropyl methylcellulose (HPMC)iyi-non-ionic cellulose ether esetshenziswa kabanzi ezintweni zokwakha, ikakhulukazi ku-mortar exutshwe kahle kanye nekhonkrithi, edlala indima yokugcina amanzi, ukuqina, kanye nokuthuthukisa ukusebenza kokwakhiwa. Ukusebenza kwe-HPMC kuthinteka kakhulu yi-viscosity yayo, futhi kukhona umehluko osobala endimeni ye-HPMC ene-viscosities ehlukene kukhonkrithi.

1. Indlela eyisisekelo yokusebenza kwe-HPMC

I-HPMC iyi-polymer encibilika emanzini engakha isixazululo esiqinile noma i-colloid emanzini. Indlela yayo eyinhloko yokusebenza ihlanganisa:

Ukugcinwa kwamanzi: I-HPMC ingavala amanzi akhululekile esigabeni sokuqala sokumuncwa kwesimende, ivimbele ukulahleka kwamanzi, futhi iqinisekise inqubekela phambili ebushelelezi yokusabela kokumuncwa kwamanzi.

Umphumela wokujiya: I-HPMC ingandisa ukujiya kwe-slurry futhi ithuthukise ukulwa nokuhlukana kanye nokugeleza kwekhonkrithi.

Umphumela wokwakha ifilimu: I-HPMC ingakha ifilimu eqhubekayo ebusweni ngesikhathi senqubo yokomisa, okusiza ukuthuthukisa amandla okubopha phakathi kwe-interfacial.

I-HPMC ene-viscosities ehlukene inezimo ezahlukene emiphumeleni engenhla, enomthelela ohlukahlukene ekusebenzeni kwekhonkrithi.

2. Imiphumela ethile ye-HPMC viscosity ekusebenzeni kokhonkolo

2.1. Umphumela ekugcinweni kwamanzi

Ukugcinwa kwamanzi kungenye yezimpawu ezibaluleke kakhulu ze-HPMC. I-HPMC ene-viscosity ephansi (isb., ngaphansi kwama-mPa angu-50,000) inokugcinwa kwamanzi okulinganiselwe futhi ifanele izinhlelo ezidinga ukukhishwa kwamanzi ngokushesha, njenge-plaster mortar. I-HPMC ene-viscosity ephakathi nendawo ephezulu (isb., 100,000 kuya ku-200,000 mPa·s) ibonisa ukugcinwa kwamanzi okungcono kukhonkrithi, okungavimbela ngempumelelo ukuvuza kwamanzi kanye nokuhwamuka kwamanzi ngaphambi kwesikhathi, ngaleyo ndlela kuqinisekiswe ukumuncwa okuqhubekayo kwesimende. Ikakhulukazi, ukusetshenziswa kwe-HPMC ene-viscosity ephezulu ezindaweni ezomile noma ezisekelweni ezimunca kakhulu kungathuthukisa kakhulu ukumelana nokuncibilika kanye nokuthuthukiswa kwamandla okuqala kukhonkrithi.

2.2. Umphumela ekusebenzeni kahle

I-HPMC ingathuthukisa kakhulu ukuqina kwekhonkrithi kanye nokusebenza kahle kwayo. Ngenxa yesilinganiso sayo sokuncibilika okusheshayo, i-HPMC enokuqina okuphansi ingasakazeka ngokushesha ohlelweni, okusiza ukuthuthukisa ukugeleza kwengxube esikhathini esifushane; kodwa ukuthuthukiswa kwayo esikhathini sokugcinwa kokugeleza akukuhle njengokwemikhiqizo enokuqina okuphezulu. I-HPMC enokuqina okuphezulu inomphumela obalulekile wokujiya. Ingathuthukisa ngempumelelo ukuhlangana kwengxube kukhonkrithi, inciphise ukopha kanye nokuhlukaniswa, kodwa ukugeleza okuphezulu kakhulu kungabangela nokuthi ukugeleza kukhonkrithi kunciphe, futhi kulula ukudala izinkinga ezifana nokunamathela emgqonyeni kanye nokwanda kokumelana kokupompa ngesikhathi sokwakha. Ngakho-ke, ekusetshenzisweni, kuyadingeka ukukhetha imikhiqizo ye-HPMC enokuqina okufanele ngokwendlela yokwakha (njengokuplasta ngesandla, ukufutha, kanye nokupompa).

2.3. Umthelela esikhathini sokusetha

I-HPMC futhi inomphumela othile wokulibazisa esikhathini sokubeka ukhonkolo, ikakhulukazi imikhiqizo ye-viscosity ephakathi nephezulu, enokugoqwa okuqinile kwezinhlayiya zesamente, ivimbela ukukhishwa kokushisa kokumanzisa, futhi ibambezele inqubo yokumanzisa usimende. Ngokuvamile, njengoba i-viscosity ye-HPMC ikhula, ukuthambekela kwayo kokulibazisa ukusetha kubaluleke kakhulu. Ekwakhiweni kwangempela, lo mphumela wokulibazisa usiza ekwandiseni isikhathi sokusebenza kwekhonkolo, kodwa umthamo kufanele ulawulwe ebusika noma ezimweni zokushisa eziphansi ukuze kugwenywe isikhathi esiningi sokubeka esithinta intuthuko yephrojekthi.

2.4. Umthelela ekuthuthukisweni kwamandla

I-HPMC ngokwayo ayihlanganyeli ekusabeleni kokumanziswa kwesamente, futhi umthelela wayo emandleni ekhonkrithi ubonakala kakhulu esigabeni sokuqala sokuthuthukiswa kwamandla. Nakuba i-HPMC ene-viscosity ephezulu inokugcinwa kahle kwamanzi, izolibazisa ukusabela kokumanziswa, okungaholela ekunciphiseni kwamandla okuqala. Kodwa-ke, esigabeni sokugcina, ngoba i-HPMC ithuthukisa izimo zokumanziswa futhi yenza i-hydrate yesamente ibe ngokugcwele, amandla akamuva avame ukuzinza noma athuthuke. Ngakho-ke, ukukhethwa okufanele kwe-medium-viscosity HPMC kungacabangela kokubili amandla okuqala kanye nokugcinwa kahle kwamanzi, okuyisinqumo esihle kakhulu.

2.5. Umthelela ezimpahleni zokubopha

I-HPMCingathuthukisa futhi amandla ayo okubopha ngesisekelo esisekhonkrithi noma odakeni. Lokhu kungenxa yezakhiwo zayo zokwakha ifilimu, futhi ngokwengxenye kuhlobene nokuthuthukiswa kwayo kwe-slurry viscosity kanye nokuhlangana. Ngokuvamile, i-HPMC ene-viscosity ephezulu ingakha isikhombimsebenzisi sokubopha esiqinile nesiqhubekayo, ngaleyo ndlela ithuthukise amandla okubopha. Kodwa-ke, ekusetshenzisweni okungokoqobo, kufanele kuqashelwe ukulinganisela umthelela wayo ekusebenzeni kokwakhiwa ukuze kugwenywe ubunzima ekukhuhleni ngenxa ye-viscosity eyeqile.

Ama-HPMC ane-viscosities ehlukene anezinzuzo zawo kanye nokungalungi kwawo kukhonkolo. Ngokuvamile:

I-HPMC ethambile: ukuncibilika okusheshayo, ukusebenza kahle, kodwa ukugcinwa kwamanzi okulinganiselwe kanye nemiphumela yokujiya;

I-HPMC evithizekile ephakathi nendawo (njenge-70,000-150,000 mPa·s): uma kucatshangelwa ukugcinwa kwamanzi, ukuqina kanye nokusebenza kahle, okwamanje iwuhlobo olusetshenziswa kakhulu;

I-HPMC ene-viscosity ephezulu (ngaphezu kuka-200,000 mPa·s): igcina amanzi kahle kakhulu, kodwa inomthelela omkhulu ekugelezeni, ifanele izimo zokusebenza ezinezidingo eziphezulu zokulawula ukuvuza kwamanzi, njenge-surface mortar kanye ne-tile adhesive ngaphansi kokwakhiwa kwezinga lokushisa eliphezulu noma izimo zezulu ezomile.