Na ojiji nkehydroxypropyl methyl cellulose HPMC, anyị na-achọpụtakarị na a na-ekewa ya na ụdị abụọ: mgbasa ozi ozugbo na ngwa ngwa. Ka anyị ghọta ihe dị iche n'etiti mgbasa ngwa ngwa na mgbasa ngwa ngwa nke hydroxypropyl methyl cellulose.
Ngwa ngwa HPMC na-ezo aka iji cross-njikọ gị n'ụlọnga maka elu ọgwụgwọ na mmepụta usoro, nke mere na HPMC nwere ike ngwa ngwa chụsasịrị na mmiri oyi, ma ọ bụghị ezigbo ngwọta, site edo edemede, viscosity nwayọọ nwayọọ bilie, ya bụ, mgbasa;
HPMC soluble nwayọọ nwayọọ nwekwara ike na-akpọ ọkụ gbazee ngwaahịa. Mgbe a na-ezute mmiri oyi, ọ nwere ike ịgbasa ngwa ngwa na mmiri ọkụ. Site n'ịkwalite nke ọma, okpomọkụ nke ngwọta ga-adaba na okpomọkụ ụfọdụ. (Okpomọkụ nke gel anyị dị ihe dị ka 60 Celsius C), viscosity ga-apụta nwayọọ nwayọọ ruo mgbe a ga-emepụta gel na-egbuke egbuke na nke na-egbuke egbuke.
Nke a bụ ihe dị iche n'etiti ngwọta ozugbo na ngwa ngwa ngwa ngwa. Ọ bụrụ na ị nwere ajụjụ ọ bụla gbasara ihe ọmụma a, ị nwekwara ike ịkpọtụrụ anyị.
Hydroxypropyl methyl celluloseHPMCna-egbu oge ciment hydration
Ịtinye hydroxypropyl methyl cellulose na ciment na-ebelata hydration ya. Yabụ kedu ihe ị maara maka etu o si arụ ọrụ? Ka anyị leba anya na hydroxypropyl methyl cellulose iji gbuo oge hydration ciment. Ụkpụrụ.
1. Ion mmegharị nsogbu hypothesis
Anyị chere na hydroxypropyl methyl cellulose ga-eme ka viscosity nke ngwọta pore dịkwuo elu, gbochie ọnụego nke ionic ije, na-egbu oge hydration nke ciment. Otú ọ dị, ethers cellulose viscosity dị ala na ule a nwere ikike ka ukwuu iji gbuo oge mmiri ciment. Ya mere, echiche a abaghị uru. Pourchez et al. na-enwekwa obi abụọ n'echiche a. N'ezie, oge ịkwaga ion ma ọ bụ ịkwaga dị mkpụmkpụ, o doro anya na ọ bụghị ihe dị iche na nkwụsị nke ciment hydration.
2. Nbibi alkaline
Polysaccharides na-agbada ngwa ngwa n'okpuru ọnọdụ alkaline iji mepụta acid hydroxyl carboxylic acid na-egbu oge mmiri ciment. Ya mere, hydration na-egbu oge nke hydroxypropyl methyl cellulose nwere ike ịbụ n'ihi mmebi ya na slurries ciment alkaline iji mepụta hydroxycarboxylic acid. Agbanyeghị, Pourchez et al. chọpụtara na ethers cellulose dị nnọọ nhịahụ n'okpuru ọnọdụ alkaline, na-eweda ya ntakịrị, na ngwaahịa ndị na-emebi emebi enwechaghị mmetụta na igbu oge nke hydration ciment.
3, adsorption
Adsorption nwere ike ịbụ hydroxypropyl methyl cellulose block ciment hydration ezi ihe kpatara ya bụ na ọtụtụ organic mgbakwunye ga-adsorbed na ciment ahụ na hydration ngwaahịa, gbochie mgbasa nke ciment ahụ na crystallization nke hydration ngwaahịa, nke mere na-egbu oge na hydration na condensation nke ciment. Pourchez et al. chọpụtara na ethers cellulose na-agbasa ngwa ngwa n'elu ngwaahịa hydration dị ka calcium hydroxide, CSH gel na calcium aluminate hydrate, ma ọ bụghị ngwa ngwa na-anabata ya site na ettringite na usoro enweghị mmiri. Ọzọkwa, n'ihe banyere cellulose ether, ike adsorption nke HEC dị ike karịa nke ọzịza MC. Na-ebelata ọdịnaya nke hydroxyethyl na HEC ma ọ bụ hydroxypropyl inHPMC, ka ike mgbasa ozi siri ike: maka ngwaahịa hydration, ikike mgbasa ozi nke calcium hydroxide siri ike karịa nke CSH. Ntụle ọzọ na-egosikwa na ikike adsorption nke ngwaahịa hydration na cellulose ether metụtara igbu oge nke ciment hydration: ka adsorption siri ike karị, ka ọ na-apụta ìhè na igbu oge, ma ettringite adsorption nke cellulose ether adịghị ike, ma nhazi ya, ma nke a na-egbu oge nke ukwuu. cellulose ether nke tricalcium silicate na hydration ngwaahịa nwere ike adsorption, o doro anya na ọ na-egbu oge usoro hydration nke silicate na-adọ, na adsorption ego nke ettringite bụ nnọọ ala, ma egbu oge ettringite guzobe bụ doro anya, n'ihi na-egbu oge ettringite e guzobere na-emetụta Ca 2 + itule na ngwọta, ọ bụ ihe ether nke cellulose. Mmiri mmiri silicate n'oge gara n'ihu.
Ndị a bụ ụkpụrụ hydroxypropyl methyl cellulose na-egbu oge cement hydration ụkpụrụ. Anyị na-atụ anya na ihe ọmụma a ga-enyere onye ọ bụla aka ịghọta otú ngwaahịa ahụ si arụ ọrụ ma jiri ya mee ihe nke ọma.
Oge nzipu: Eprel-26-2024