Ukuqina kwefuthe le-hydroxypropyl methylcellulose

IHydroxypropyl methylcelluloseHPMCinika udaka olumanzi kunye ne-viscosity egqwesileyo, enokunyusa kakhulu ukunamathela phakathi kodaka olumanzi kunye nomgangatho wesiseko, kunye nokuphucula ukusebenza kodaka oluchasayo. eludaka. Isiphumo esityebileyo se-cellulose ether sinokunyusa i-homogeneity kunye nesakhono sokuchasa ukusasazeka kwezixhobo ezitsha esekwe kwisamente, ukuthintela ukubola, ulwahlulo kunye nokopha kodaka kunye nekhonkrithi, kwaye ingasetyenziselwa kwikhonkrithi eyomeleziweyo, phantsi kwamanzi kunye nokuzibamba. ikhonkrithi .

I-Hydroxypropyl methylcellulose yandisa i-viscosity yezinto ezisekelwe kwi-samente ukusuka kwi-viscosity yesisombululo se-cellulose ether. I-viscosity yesisombululo se-cellulose ether ngokuqhelekileyo ihlolwe yi-index "viscosity". I-viscosity ye-ether ye-cellulose ibhekisela ngokubanzi kugxininiso oluthile (olufana ne-2%) yesisombululo se-cellulose ether kwiqondo lokushisa elithile (elifana ne-20 ° C) kunye nokucheba Ixabiso le-viscosity elilinganiswa ngesixhobo sokulinganisa esicacisiweyo (njenge-viscometer ejikelezayo) phantsi kwemeko yesantya (okanye izinga lokujikeleza, njenge-20 rpm).

I-Viscosity yiparameter ebalulekileyo yokuvavanya ukusebenza kwe-cellulose ether. Ukuphakama kwe-viscosity yesisombululo se-hydroxypropyl methylcellulose, ngcono i-viscosity yezinto ezisekelwe kwi-samente, ngcono ukunamathela kwi-substrate, bhetele i-anti-sagging kunye ne-anti-dispersing. Yomelele, kodwa ukuba i-viscosity yayo inkulu kakhulu, iya kuchaphazela umbane kunye nokusebenza kwezinto ezisekelwe kwisamente (ezifana nokuncamathelisa iimela zokutyabeka ngexesha lokwakhiwa kodaka). Ke ngoko, i-viscosity ye-cellulose ether esetyenziswa kumdaka oxubeneyo owomileyo idla ngokuba yi-15,000 ~ 60,000 mPa. I-S-1, i-self-leveling mortar kunye ne-self-compacting concrete efuna i-fluidity ephezulu ifuna i-viscosity ephantsi ye-ether cellulose.

Ukongeza, isiphumo esityebileyo se-hydroxypropyl methylcellulose sonyusa imfuno yamanzi yemathiriyeli esekwe kwisamente, ngaloo ndlela inyusa isivuno sodaka.

I-viscosity yesisombululo se-hydroxypropyl methylcellulose ixhomekeke kwezi zinto zilandelayo:

I-cellulose ether ubunzima bemolekyuli (okanye idigri yepolymerization) kunye noxinzelelo, ubushushu besisombululo, izinga lokucheba, kunye neendlela zovavanyo.

1. Iqondo eliphezulu le-polymerization ye-cellulose ether, ubukhulu be-molecular weight, kunye nokuphakama kwe-viscosity yesisombululo sayo samanzi;

2. Okukhona idosi ephezulu (okanye i-concentration) ye-cellulose ether, iphezulu i-viscosity yesisombululo sayo samanzi, kodwa ingqalelo kufuneka ihlawulwe ekukhetheni idosi efanelekileyo xa uyisebenzisa, ukwenzela ukuba ugweme idosi egqithisileyo kwaye ichaphazele ukusebenza kodaka. kunye nekhonkrithi;

3. Njengamanzi amaninzi, i-viscosity yesisombululo se-cellulose ether iya kuncipha ngokunyuka kweqondo lokushisa, kwaye iphezulu i-concentration ye-cellulose ether, impembelelo enkulu yeqondo lokushisa;

4. Izisombululo ze-ether ze-cellulose zidla ngokuba yi-pseudoplastics eneempawu zokucheba ezibhityileyo. Ukuphakama kwesantya sokucheba ngexesha lovavanyo, i-viscosity ephantsi.

Ngoko ke, ukudityaniswa komdaka kuya kuncitshiswa ngenxa yesenzo samandla angaphandle, okunenzuzo ekukhutsheni ukwakhiwa komdaka, ukwenzela ukuba udaka lunokusebenza kakuhle kunye nokubambisana ngexesha elifanayo. Nangona kunjalo, xa ukuxinwa kwesisombululo se-cellulose ether kuphantsi kakhulu kwaye i-viscosity incinci kakhulu, iya kubonisa iimpawu ze-Newtonian fluid. Xa ugxininiso lukhula, isisombululo siya kubonisa ngokuthe ngcembe iimpawu ze-pseudoplastic fluid, kwaye iphakamileyo yoxinaniso, ngokucacileyo ngakumbi i-pseudoplasticity.