N'ijihydroxypropyl methyl cellulose HPMC, anyị na-achọpụtakarị na e kewara ya ụzọ abụọ: nkewa ozugbo na nkewa nwayọ. Ka anyị ghọta ihe dị iche n'etiti nkewa ngwa ngwa na nkewa nwayọ nke hydroxypropyl methyl cellulose.
HPMC ozugbo na-ezo aka na ojiji nke ihe na-ejikọ ihe maka ọgwụgwọ elu n'ime usoro mmepụta, ka HPMC wee nwee ike gbasaa ngwa ngwa na mmiri oyi, mana ọ bụghị ezigbo ngwọta, site na otu mkpali, viscosity na-ebili nwayọ nwayọ, ya bụ, mgbaze;
A pụkwara ịkpọ HPMC nke na-agbaze nwayọ nwayọ ngwaahịa na-agbaze ọkụ. Mgbe mmiri oyi zutere, enwere ike ịgbasa ya ngwa ngwa na mmiri ọkụ. Site na ịkpalite ya nke ọma, okpomọkụ nke ihe ngwọta ahụ ga-adaba ruo na okpomọkụ ụfọdụ. (Okpomọkụ nke jel anyị dị ihe dị ka 60°C), viscosity ga-apụta nwayọ nwayọ ruo mgbe e mepụtara jel na-acha ọcha ma na-arapara.
Nke a bụ ọdịiche dị n'etiti ngwọta ozugbo na ngwọta nwayọ. Ọ bụrụ na ị nwere ajụjụ ọ bụla gbasara ihe ọmụma a, ị nwekwara ike ịkpọtụrụ anyị.
hydroxypropyl methyl celluloseHPMCna-egbu oge mmiri simenti
Ịtinye hydroxypropyl methyl cellulose na simenti na-eme ka mmiri ya ghara ịdị ọcha. Gịnị ka ị maara gbasara otu o si arụ ọrụ? Ka anyị leba anya na hydroxypropyl methyl cellulose iji belata mmiri simenti. Ụkpụrụ.
1. Echiche nke nsogbu mmegharị ion
Anyị chere na hydroxypropyl methyl cellulose ga-eme ka mmiri dị n'ime oghere dịkwuo elu, gbochie ọsọ nke mmegharị ionic, ma mee ka mmiri dị n'ime simenti ghara ịdị irè. Agbanyeghị, obere viscosity cellulose ethers dị na nnwale a nwere ike siri ike ime ka mmiri simenti ghara ịdị irè. Ya mere, echiche a abaghị uru. Pourchez na ndị otu ya na-enwe obi abụọ banyere echiche a. N'ezie, oge mbugharị ion ma ọ bụ mbugharị dị mkpụmkpụ, o doro anya na ọ dịghị iche na igbu oge mmiri simenti.
2. Mmebi alkaline
Polysaccharides na-emebi ngwa ngwa n'okpuru ọnọdụ alkaline iji mepụta hydroxyl carboxylic acid nke na-egbochi mmiri simenti. Ya mere, mmiri hydroxypropyl methyl cellulose na-egbu oge nwere ike ịbụ n'ihi mmebi ya na slurries simenti alkaline iji mepụta hydroxycarboxylic acid. Agbanyeghị, Pourchez na ndị otu ya chọpụtara na cellulose ethers kwụsiri ike nke ukwuu n'okpuru ọnọdụ alkaline, na-emebi naanị ntakịrị, ngwaahịa mmebi ahụ enweghịkwa mmetụta dị ukwuu na igbu oge mmiri simenti.
3, njupụta
Ntinye nwere ike ịbụ hydroxypropyl methyl cellulose block siment hydration nke na-egbochi mmiri simenti hydration nke na-eme ka ọtụtụ ihe ndị e ji ihe ndị dị ndụ tinye n'ime simentị na ngwaahịa mmiri simenti, na-egbochi mgbasa nke ihe ndị simentị na kristal nke ngwaahịa mmiri simenti, iji mee ka mmiri simenti na mmiri simenti ghara ịdị irè. Pourchez na ndị otu ya chọpụtara na cellulose ethers na-abanye ngwa ngwa n'elu ngwaahịa mmiri dị ka calcium hydroxide, CSH gel na calcium aluminate hydrate, mana ettringite na usoro ndị a na-anaghị aṅụ mmiri adịghị amịkọrọ ngwa ngwa. Ọzọkwa, n'ihe gbasara cellulose ether, ikike ntinye nke HEC siri ike karịa nke MC. Ka ọdịnaya nke hydroxyethyl dị ala na HEC ma ọ bụ hydroxypropyl naHPMC, ikike nnabata siri ike: maka ngwaahịa mmiri, ikike nnabata nke calcium hydroxide siri ike karịa nke CSH. Nyocha ọzọ na-egosikwa na ikike nnabata nke ngwaahịa mmiri na cellulose ether metụtara igbu oge nke mmiri simenti: ka mmiri sikwuo ike, otú ahụ ka igbu oge ahụ na-apụta ìhè, mana ntinye ettringite nke cellulose ether adịghị ike, mana nhazi ya, mana nke a na-egbu oge nke ukwuu. cellulose ether nke tricalcium silicate na ngwaahịa mmiri ya nwere ntinye siri ike, o doro anya na ọ na-egbu oge usoro mmiri nke silicate phase, ọnụọgụ adsorption nke ettringite dị obere, mana nhazi ettringite na-egbu oge doro anya, n'ihi nhazi ettringite na-egbu oge na-emetụta nhazi Ca2+ na ngwọta ahụ, ọ bụ ndọtị nke cellulose ether. Mmiri silicate na-aga n'ihu.
Ndị a bụ ụkpụrụ hydroxypropyl methyl cellulose delay cement hydration. Anyị nwere olileanya na ihe ọmụma a ga-enyere onye ọ bụla aka ịghọta otu ngwaahịa a si arụ ọrụ ma jiri ya nke ọma.
Oge ozi: Eprel-26-2024