1. Nchịkọta nke cellulose ether (HPMC)
Hydroxypropyl methylcellulose (HPMC) bụ ether cellulose ether a na-ejikarị eme ihe, bụ nke a na-eji kemịkal emezi site na cellulose eke. Ọ nwere mma mmiri solubility, ihe nkiri-akpụ, ndim na nrapado Njirimara, ya mere a na-eji ọtụtụ ebe na-ewu ihe. Ngwa nke HPMC n'ime ihe ndị sitere na ciment bụ tumadi iji meziwanye mmiri ya, njigide mmiri na ịhazi oge nhazi.
2.Basic usoro nke ciment ntọala
Usoro ciment na-emeghachi omume na mmiri iji mepụta hydrates bụ mmeghachi omume hydration. E kewara usoro a n'ọtụtụ usoro:
Oge ntinye: Akụkụ ciment na-amalite ịgbaze, na-eme ka calcium ions na ion silicate, na-egosi ọnọdụ na-agba ọsọ dị mkpirikpi.
Oge osooso: Ngwaahịa hydration na-abawanye ngwa ngwa na usoro ntọala amalite.
Oge nkwụsịtụ: Ọnụ ọgụgụ hydration na-ebelata, ciment na-amalite ịmalite, na nkume ciment siri ike na-emepụta.
Oge nkwụsi ike: Ngwaahịa hydration ji nwayọọ nwayọọ tozuo ma ike ji nwayọọ nwayọọ na-abawanye.
A na-ekewakarị oge ịtọ ntọala na oge ntọala mbụ na oge ntọala ikpeazụ. Oge mmalite mmalite na-ezo aka na oge mgbe tapawa ciment na-amalite ịla n'iyi, na oge nhazi ikpeazụ na-ezo aka na oge mgbe ciment mado na-efunahụ plasticity kpamkpam wee banye n'ọgbọ ike.
3. Usoro nke mmetụta nke HPMC na oge nhazi ciment
3.1 Mmetụta dị arọ
HPMC nwere mmetụta dị oke mkpa. Ọ nwere ike ịbawanye viscosity nke ciment mado ma mepụta usoro viscosity dị elu. Mmetụta a siri ike ga-emetụta mgbasa na sedimentation nke akụkụ ciment, ma si otú ahụ na-emetụta ọganihu nke mmeghachi omume hydration. Mmetụta dị nro na-ebelata ntinye ntinye nke ngwaahịa hydration n'elu akụkụ ciment, si otú ahụ na-egbu oge nhazi oge.
3.2 Njide mmiri
HPMC nwere ezigbo njide mmiri. Ịtinye HPMC na tapawa ciment nwere ike imeziwanye njide mmiri nke mado ahụ. Nnukwu mmiri na-ejide mmiri nwere ike igbochi mmiri dị n'elu ciment ka ọ ghara ikpochapụ ngwa ngwa, ka e wee nọgide na-enwe mmiri dị na ciment mado na ogologo oge mmeghachi omume hydration. Tụkwasị na nke ahụ, njide mmiri na-enyere aka na-edozi cimenti iji nọgide na-enwe iru mmiri kwesịrị ekwesị n'oge usoro ọgwụgwọ ma belata ihe ize ndụ nke mgbawa nke mmiri mbụ na-akpata.
3.3 hydration retardation
HPMC nwere ike ịmepụta ihe nkiri nchebe na-ekpuchi elu nke simenti, nke ga-egbochi mmeghachi omume hydration. Ihe nkiri nchebe a na-egbochi kọntaktị kpọmkwem n'etiti akụkụ ciment na mmiri, si otú ahụ na-egbu oge usoro hydration nke ciment ma na-agbatị oge nhazi. Mmetụta igbu oge a pụtara ìhè karịsịa na HPMC dị arọ dị elu.
3.4 thixotropy emelitere
Mgbakwunye nke HPMC nwekwara ike welie thixotropy nke ciment slurry (ie, fluidity na-abawanye n'okpuru omume nke mpụga ike na-alaghachi na mbụ ala mgbe mpụga ike wepụrụ). Ngwongwo thixotropic a na-enyere aka imeziwanye ọrụ nke ciment slurry, ma n'ihe gbasara ịtọ oge, thixotropy a na-emewanyewanye nwere ike ime ka slurry na-ekesa n'okpuru ike ịkwa akwa, na-agbatịkwu oge nhazi.
4. Ngwa bara uru nke HPMC na-emetụta oge ntọala ciment
4.1 Ihe n'ala na-edozi onwe ya
N'ime ihe n'ala na-edozi onwe ya, ciment chọrọ ogologo oge nhazi mmalite maka nhazi ọkwa na ịrụ ọrụ nhazi. Ịgbakwunye HPMC nwere ike ịgbatị oge ntọala mbụ nke ciment, na-ekwe ka ihe ndị na-edozi onwe ha nwee ogologo oge na-arụ ọrụ n'oge a na-ewu ụlọ, na-ezere nsogbu nke nhazi ciment slurry n'oge a na-ewu.
4.2 Ngwa agha ejikọtara ọnụ
N'ime ngwa agha agbakwunyere, HPMC abụghị naanị na-eme ka njide mmiri dị mma, kamakwa ọ na-agbatị oge nhazi. Nke a dị mkpa karịsịa maka oge ndị nwere ogologo njem na oge owuwu, na-ahụ na ngwa agha ahụ na-ejigide arụ ọrụ nke ọma tupu ejiri ya na izere ihe isi ike ihe owuwu nke oge nhazi dị mkpirikpi kpatara.
4.3 Ngwa ngwa agwakọta akpọnwụ
A na-agbakwunye HPMC na ngwa ngwa agwakọtara akpọnwụ akpọnwụ iji kwalite ịrụ ọrụ ya. Mmetụta siri ike nke HPMC na-abawanye viscosity nke ngwa agha ahụ, na-eme ka ọ dị mfe itinye na ọkwa n'oge a na-ewu ụlọ, ma na-agbatịkwa oge nhazi, na-enye ndị ọrụ ihe owuwu oge zuru ezu iji mee mgbanwe.
5. Ihe ndị na-emetụta oge nhazi nke ciment site na HPMC
5.1 ego mgbakwunye HPMC
Ọnụ ego nke HPMC agbakwunyere bụ isi ihe na-emetụta oge nhazi nke ciment. N'ozuzu, ka ọnụ ọgụgụ nke HPMC agbakwunyere, ka a na-apụtawanye ìhè n'oge nhazi oge ciment. Nke a bụ n'ihi na ọtụtụ ụmụ irighiri ihe HPMC nwere ike ikpuchi elu akụkụ ciment ọzọ ma gbochie mmeghachi omume hydration.
5.2 Molecular arọ nke HPMC
HPMC nke ịdị arọ molekụla dị iche iche nwere mmetụta dị iche iche na nhazi oge ciment. HPMC nwere ibu molekụla dị elu na-enwekarị mmetụta siri ike na ike ijide mmiri, yabụ ọ nwere ike ịgbatị oge ntọala ahụ nke ọma. Ọ bụ ezie na HPMC nwere obere molekụla dị ala nwekwara ike ịgbatị oge ntọala, mmetụta adịghị ike.
5.3 Ọnọdụ gburugburu ebe obibi
Ọnọdụ okpomọkụ na iru mmiri ga-emetụtakwa mmetụta HPMC na oge nhazi ciment. Na ọnọdụ okpomọkụ dị elu, mmeghachi omume hydration ciment na-eme ngwa ngwa, mana njide mmiri nke HPMC na-ebelata mmetụta a. N'ebe ọnọdụ okpomọkụ dị ala, mmeghachi omume hydration n'onwe ya na-adị ngwa ngwa, yana nkwụsi ike na njigide mmiri nke HPMC nwere ike ime ka oge nhazi ciment gbatịa nke ukwuu.
5.4 Mmiri-ciment ruru
Mgbanwe nke mmiri-ciment ruru ga-emetụtakwa mmetụta HPMC na oge nhazi ciment. N'ebe dị elu nke mmiri-ciment, a na-enwekwu mmiri na ciment mado, na mmetụta njigide mmiri nke HPMC nwere ike inwe mmetụta dị ntakịrị na oge nhazi. N'ebe dị ala mmiri-ciment ruru, mmetụta na-agbapụta nke HPMC ga-apụta ìhè karịa, na mmetụta nke ịgbatị oge nhazi ga-adị mkpa karị.
Dị ka ihe mgbakwunye simenti dị mkpa, HPMC na-emetụta n'ụzọ dị ukwuu nhazi oge ciment site na usoro dị iche iche dị ka ịgbara mmiri, njide mmiri, na nkwụsị nke mmeghachi omume hydration. Ngwa nke HPMC nwere ike ịgbatị oge mmalite na nke ikpeazụ nke ciment, nye ogologo oge ọrụ ihe owuwu, ma melite arụmọrụ nke ihe ndị sitere na ciment. N'ime ngwa bara uru, ihe ndị dị ka ọnụọgụ HPMC agbakwunyere, ịdị arọ molecular, na ọnọdụ gburugburu ebe obibi na-ejikọta kpọmkwem mmetụta ya na oge ịtọ ciment. Site n'iji ezi uche na-edozi ihe ndị a, enwere ike nweta njikwa ziri ezi nke oge nhazi ciment iji gboo mkpa nke ọrụ ihe owuwu dị iche iche.
Oge nzipu: Jun-21-2024