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.