Cellulose ethers yog ib chav kawm tseem ceeb ntawm cov khoom siv polymer uas yaj tau hauv dej, siv dav hauv kev tsim kho, tshuaj, khoom noj, tshuaj txhua hnub thiab lwm yam lag luam. Hauv kev tsim kho (xws li cov tshuaj sib xyaw qhuav, cov nplaum pobzeb, hmoov putty, thiab lwm yam), ib qho ntawm cov khoom tseem ceeb tshaj plaws ntawmcov cellulose ethersyog nws cov dej khaws cia, uas yog, nws tuaj yeem khaws dej hauv lub kaw lus thaum siv los tiv thaiv dej kom tsis txhob evaporate lossis raug nqus sai dhau, yog li ua kom ntseeg tau tias kev tsim kho thiab kev ua tiav zaum kawg ntawm cov khoom siv. Muaj ntau yam uas cuam tshuam rau kev khaws dej ntawm cellulose ethers, feem ntau suav nrog nws cov qauv tshuaj lom neeg, qib ntawm kev hloov pauv, viscosity, ntxiv ntau npaum li cas, qhov loj me ntawm cov khoom me me, tus nqi yaj, thiab cov yam ntxwv ib puag ncig sab nraud.
1. Cov yam ntxwv ntawm cellulose ethers lawv tus kheej
Qib Kev Hloov Chaw (DS) thiab kev sib xws
Qhov degree ntawm kev hloov pauv yog hais txog tus lej nruab nrab ntawm cov hydroxyl pawg hauv cellulose molecules hloov los ntawm ether pawg. Feem ntau, qhov siab dua ntawm kev hloov pauv, qhov muaj zog ntawm hydrophilicity ntawm cellulose ethers thiab qhov zoo dua qhov muaj peev xwm khaws dej. Txawm li cas los xij, kuj muaj qee qhov tseem ceeb. Tus nqi siab dhau yuav ua rau muaj kev yaj ntau dhau thiab kev ua kom lubrication ntau dhau, uas yuav cuam tshuam rau kev ruaj khov ntawm cov qauv khoom.
Qhov sib xws ntawm kev hloov pauv kuj tseem ceeb heev. Qhov sib xws ntau dua qhov kev hloov pauv, qhov ruaj khov dua ntawm cov qauv network tsim los ntawm cellulose ether hauv dej, thiab nws tuaj yeem kaw cov dej noo tau zoo dua.
Qhov viscosity
Qhov viscosity ntawm cellulose ether hauv dej ncaj qha cuam tshuam rau nws "lub peev xwm sealing" rau cov dej noo. Feem ntau hais lus, cov cellulose ethers viscosity siab (xws li HPMC, HEMC, thiab lwm yam) tuaj yeem tsim cov qauv network peb-seem denser, txwv qhov ceev ntawm kev tsiv teb tsaws dej, thiab yog li txhim kho kev khaws cia dej. Txawm li cas los xij, viscosity siab dhau yuav cuam tshuam rau kev ua haujlwm ntawm cov khoom siv, xws li kev nyuaj siab ntawm kev tsim kho lossis kev txheej tsis sib xws.
Qhov hnyav molecular thiab degree ntawm polymerization
Qhov hnyav molecular ntawm cellulose ether loj dua, qhov muaj zog ntawm kev sib txuas ntawm cov saw hlau, qhov ntau viscous cov kua colloidal tsim, thiab qhov muaj zog ntawm kev khaws dej. Txawm li cas los xij, yuav tsum muaj kev sib npaug ntawm kev khaws dej siab thiab yooj yim yaj.
Qhov loj me ntawm cov khoom me me thiab kev tawg ua tej daim me me
Qhov loj me ntawm cov hmoov cellulose ether nyoos cuam tshuam rau nws qhov kev yaj thiab kev sib kis hauv dej. Qhov me me ntawm cov hmoov, qhov sai dua qhov kev yaj, thiab nws yooj yim dua los faib sib npaug hauv cov khoom, yog li ua lub luag haujlwm zoo dua hauv kev khaws dej. Txawm li cas los xij, cov hmoov me me yooj yim nqus cov dej noo thiab sib sau ua ke thaum khaws cia thiab thauj mus los, cuam tshuam rau kev ua haujlwm.
2. Siv cov mis thiab cov yam ntxwv ntsig txog lub kaw lus
Tus nqi ntxiv
Qhov ntau ntawm cov cellulose ether ntxiv rau hauv cov mis cuam tshuam ncaj qha rau qhov kev ua tau zoo ntawm kev khaws dej. Feem ntau, thaum qhov ntau ntxiv nce ntxiv, qhov kev khaws dej tau zoo dua, tab sis tom qab dhau qee qhov ntau, qhov cuam tshuam ntawm kev nce ntxiv yuav zoo li saturation, thiab nws tseem yuav cuam tshuam rau tus nqi thiab kev ua haujlwm ntawm kev tsim kho.
Kev nqus dej ntawm lwm cov ntaub ntawv raw
Qhov kev nqus dej ntawm cov khoom siv raw xws li cement, gypsum, xuab zeb, thiab lwm yam kuj tseem yuav cuam tshuam rau qhov kev khaws dej. Cov ntaub ntawv uas muaj zog nqus dej yuav nqus dej sai sai los ntawm lub kaw lus, ua kom qhuav sai dua, thiab ua rau qhov cuam tshuam ntawm kev khaws dej ntawm cellulose ether tseem ceeb dua. Yog li ntawd, hauv hom kab ke no, cellulose ether nrog viscosity siab dua lossis ntau ntxiv yog qhov yuav tsum tau ua.
Qhov sib piv ntawm dej thiab cement (W/C)
Hauv cov ntaub ntawv tsim kho, kev hloov pauv ntawm qhov sib piv ntawm dej-cement kuj cuam tshuam rau qhov khaws dej ntawm cellulose ether. Thaum qhov sib piv ntawm dej-cement qis, muaj dej tsawg dua hauv lub kaw lus, thiab qhov siab ntawm kev khaws dej ntawm cellulose ether ntau dua; thaum qhov sib piv ntawm dej-cement siab, muaj dej txaus hauv lub kaw lus, thiab cellulose ether tuaj yeem ncua qhov poob dej tau zoo dua.
3. Tej yam ib puag ncig
Kub
Qhov kub nce ntxiv yuav ua rau cov dej evaporation sai dua, thiab tso tawm cov kev xav tau siab dua rau kev khaws dej ntawm cellulose ether. Tshwj xeeb tshaj yog nyob rau hauv qhov chaw kub thiab qhuav, yog tias cov dej khaws cia ntawm cellulose ether tsis zoo, nws yooj yim ua rau mortar, putty thiab lwm yam khoom siv hauv kev tsim kho kom tawg, hmoov thiab tsis muaj zog.
Nws yuav tsum tau sau tseg tias qhov solubility ntawm cellulose ether ntawm qhov kub siab kuj tseem yuav hloov pauv, thiab qee hom yuav gel, cuam tshuam rau nws txoj haujlwm tswj dej noo.
Av noo thiab cua ceev
Thaum cov av noo qis thiab cua ceev siab, cov dej evaporation yuav nrawm dua, thiab lub kaw lus yuav poob dej ntau dua, uas xav tau tus neeg sawv cev khaws dej zoo dua los daws nws. Hauv qhov chaw noo noo siab, dej tsis yooj yim poob, thiab lub zog khaws dej ntawm cellulose ether me me.
4. Cov yam ntxwv ntawm kev tsim kho
Txheej tuab thiab txoj kev ua haujlwm
Cov txheej txheej nyias nyias yuav poob dej ntau dua li cov txheej tuab, yog li kev tsim cov txheej nyias nyias vam khom ntau dua rau cellulose ether nrog kev khaws cia dej siab. Tib lub sijhawm, kev sib xyaw ua ke, txoj kev txheej (mechanical lossis manual), tus nqi nqus dej ntawm cov substrate, thiab lwm yam kuj tseem yuav cuam tshuam rau qhov kev ua tau zoo ntawm kev khaws cia dej.
Kev nqus dej ntawm cov substrate
Piv txwv li, qhov nqus dej ntawm cov khoom siv xws li cib, pob zeb ua vaj tse, thiab gypsum boards txawv, uas yuav cuam tshuam rau lub peev xwm ntawm cellulose ether kom khaws dej. Lub substrate nqus tau ntau dua, nws yuav nqus dej sai dua los ntawm cov mortar, thiab cellulose ether yuav tsum tsim kom muaj cov dej tuav sai sai.
Lubcov khoom khaws cia dej ntawm cellulose etheryog ib yam khoom uas txiav txim siab los ntawm ntau yam. Nws tus kheej cov qauv (xws li qib kev hloov pauv, viscosity, qhov loj me ntawm cov khoom me me), siv ib puag ncig (kub, av noo, cua ceev) thiab cov mis tsim kho (ntxiv ntau npaum li cas, dej-cement piv, cov yam ntxwv ntawm cov khoom siv raw) yuav muaj kev cuam tshuam loj rau nws cov kev ua tau zoo. Yog li ntawd, hauv daim ntawv thov, hom thiab ntau npaum li cas ntawm cellulose ether yuav tsum tau xaiv raws li qhov xwm txheej siv tshwj xeeb thiab tsim cov mis kom ua tiav qhov zoo tshaj plaws ntawm kev khaws dej thiab kev ua tau zoo ntawm kev tsim kho.
Lub sijhawm tshaj tawm: Tsib Hlis-08-2025