HPMC (Hydroxypropyl Methylcellulose) yog cov dej-soluble polymer compound tau los ntawm kev hloov kho tshuaj ntawm ntuj cellulose. Nws yog dav siv nyob rau hauv cov xim thiab coatings vim nws zoo thickening, stabilization, thiab dej tuav cov khoom. HPMC tuaj yeem txhim kho qhov rheology, kev ruaj ntseg, thiab kev tsim kho ntawm cov txheej txheem, kom ntseeg tau tias cov txheej txheem muaj kev ruaj khov thaum lub sijhawm khaws cia, kev thauj mus los, thiab kev tsim kho, thiab tau txais cov txheej txheem txheej txheej.
(1) Cov khoom tseem ceeb ntawm HPMC
HPMC yog non-ionic cellulose ether nrog cov yam ntxwv hauv qab no:
Cov nyhuv Thickening: HPMC tuaj yeem tsim cov kua dej khov rau hauv dej thiab cov kuab tshuaj organic, uas tuaj yeem ua kom cov viscosity ntawm txheej txheej, yog li ua kom cov txheej txheej npog kev ua haujlwm thiab txheej tuab.
Cov nyhuv tuav dej: HPMC muaj peev xwm tuav tau dej zoo heev thiab tuaj yeem tiv thaiv cov dej evaporation sai hauv txheej txheej. Nws yog tshwj xeeb tshaj yog haum rau cov dej-raws li txheej uas yuav tsum tau siv nyob rau hauv ib qho chaw qhuav.
Cov cuab yeej tsim cov yeeb yaj kiab: HPMC, raws li kev pabcuam ua yeeb yaj kiab, tuaj yeem pab cov txheej txheem ua kom zoo nkauj thiab zoo li txheej txheej thaum lub sijhawm ziab, txhim kho qhov tsos thiab flatness ntawm txheej zaj duab xis.
Compatibility: HPMC muaj tshuaj zoo stability thiab compatibility nrog ntau yam formulation cov khoom xyaw, thiab yog haum rau ntau hom txheej formulations.
(2) Lub luag haujlwm tseem ceeb ntawm HPMC hauv cov xim thiab txheej
1. Thickener
Nyob rau hauv cov xim thiab txheej formulations, HPMC, raws li ib tug ntawm lub ntsiab thickeners, pab kho rheology (ie, fluidity thiab deformability) ntawm txheej los ntawm kev hloov nws viscosity. Cov khoom zoo rheological tuaj yeem tiv thaiv cov txheej txheem los ntawm kev daws teeb meem thaum lub sijhawm khaws cia thiab tswj kom tsim nyog fluidity thiab txheej txheej thaum tsim kho.
Cov nyhuv thickening muaj qhov sib txawv ntawm ntau hom txheej txheej. Hauv cov txheej txheem dej, HPMC ua kom cov viscosity ntawm cov txheej, ua kom yooj yim rau kev thov thiab sib npaug ntawm qhov chaw, tsis txhob sagging. Hauv cov txheej txheem hnyav, HPMC kuj tseem pab kho cov viscosity thiab muab cov thixotropy tsim nyog (cov txheej txheej thickens thaum nws tawm sab laug thiab thins thaum nws yog nplawm los yog siv).
2. Tus neeg saib xyuas dej
Cov nyhuv dej tuav ntawm HPMC yog qhov tseem ceeb tshwj xeeb, tshwj xeeb tshaj yog nyob rau hauv cov xim dej. Nws tuaj yeem tiv thaiv cov dej hauv cov xim los ntawm evaporating sai heev thaum lub sij hawm tsim kho, yog li xyuas kom meej tias cov txheej txheem muaj sij hawm txaus rau theem thiab tsim ib tug du thiab uniform txheej zaj duab xis. Nyob rau hauv qhuav los yog kub kub, cov evaporation ntawm cov dej nyob rau hauv cov xim sai heev yuav ua rau tawg ntawm txheej zaj duab xis los yog nto tsis sib xws. HPMC tuaj yeem ua rau cov txheej txheem no qeeb qeeb.
HPMC tseem tuaj yeem pab cov pigments thiab fillers nyob rau hauv cov xim kom nyob twj ywm sib cais thaum lub sij hawm tsim kho, tiv thaiv lub zos qhuav los yog particle agglomeration, li no kom ntseeg tau qhov zoo nkauj thiab uniformity ntawm txheej zaj duab xis.
3. Leveling tus neeg sawv cev thiab anti-sagging nyhuv
Raws li tus neeg sawv cev theem, HPMC tuaj yeem tiv thaiv cov xim ntawm sagging los yog sag thaum lub sij hawm ziab ntawm cov xim. Vim nws cov khoom tshwj xeeb rheological, HPMC tuaj yeem muab cov dej ntws zoo thaum lub sijhawm txheej txheej, tso cai rau cov xim kom sib npaug ntawm qhov chaw ntawm lub substrate. Tom qab tso tseg kev ua haujlwm, cov viscosity ntawm cov xim maj mam rov qab los tiv thaiv kev ntws ntau dhau thiab tsim cov cim sagging.
Qhov tshwj xeeb no yog qhov tseem ceeb tshwj xeeb hauv kev pleev xim façade lossis lwm lub sijhawm uas yuav tsum muaj daim ntawv thov ntsug. Qhov sib ntxiv ntawm HPMC ua kom cov xim sai sai tau txais kev sib raug zoo tom qab thov, kom nws nyob ntawm qhov chaw uas nws tau thov, thiab tsis ntws mus rau hauv qab vim lub ntiajteb txawj nqus.
4. Cov nyhuv dispersant
HPMC, raws li ib tug dispersant, tuaj yeem txhim kho dispersibility ntawm pigments thiab fillers nyob rau hauv cov xim. Los ntawm kev txhim kho cov dispersibility ntawm pigments thiab muab tub lim, HPMC tuaj yeem xyuas kom meej tias cov khoom siv hauv cov xim zoo li tawg, tsis txhob agglomeration thiab sedimentation, thiab yog li txhim kho cov uniformity thiab stability ntawm txheej. Qhov no yog qhov tseem ceeb rau cov xim sib xws thiab cov khoom siv kho tshuab ntawm txheej.
5. Kev pab ua yeeb yaj kiab
Thaum lub sij hawm ua zaj duab xis txheej txheem ntawm cov xim, HPMC kuj tseem siv tau los ua ib qho kev pab ua zaj duab xis los pab tsim cov txheej txheej. Qhov no feature yog qhov tseem ceeb rau kev txhim kho qhov zoo ntawm cov txheej txheej. Thaum lub sij hawm ziab, HPMC xyuas kom meej tias cov xim tuaj yeem qhuav sib npaug ntawm qhov chaw thiab sab hauv los ntawm kev kho cov evaporation tus nqi ntawm cov dej, tsim ib lub tiaj thiab du txheej. Tshwj xeeb tshaj yog nyob rau hauv high-gloss xim thiab cov xim zoo nkauj, lub luag hauj lwm ntawm HPMC ua rau cov txheej txheem kom zoo dua qub.
(3) Qhov zoo ntawm kev siv HPMC
1. Txhim kho kev tsim kho ntawm cov txheej txheem
Cov kev cai rheological ntawm HPMC ua rau cov txheej txheem yooj yim rau kev khiav lag luam thaum lub sij hawm thov, thiab kev tsim kho kev ua haujlwm tau zoo dua qub. Cov txheej yuav tsis ntws ntau dhau los yog tsim cov cim txhuam, cov txheej txheej zoo sib xws, thiab cov yeeb yaj kiab txheej tsim tom qab kev tsim kho yog smoother thiab flatter.
2. Txhim kho qhov ruaj khov ntawm cov txheej txheem
HPMC tuaj yeem tiv thaiv qhov stratification thiab sedimentation ntawm txheej thaum khaws cia, thiab tswj qhov sib xws thiab ruaj khov ntawm txheej. Nws cov nyhuv thickening thiab dispersing tuaj yeem ua kom cov pigments thiab fillers nyob rau hauv lub txheej nyob rau hauv ib tug uniformly dispersed lub xeev, ncua lub neej cia ntawm txheej.
3. Txhim kho qhov kev tiv thaiv kev ua haujlwm ntawm cov yeeb yaj kiab txheej
Cov dej tuav cov nyhuv ntawm HPMC ua kom cov dej hauv cov txheej txheem tuaj yeem maj mam evaporated thaum lub sij hawm ziab, thiab cov txheej txheem txheej yuav tsis tawg vim sai sai thaum nws tsim, yog li txhim kho tag nrho cov zoo thiab durability ntawm txheej zaj duab xis.
4. Adaptability rau ib puag ncig sib txawv
Txij li HPMC muaj qhov hloov pauv tau zoo rau kev hloov pauv ntawm qhov kub thiab txias, nws yog qhov tsim nyog rau txheej txheej tsim nyob rau hauv ntau yam kev mob ib puag ncig, tshwj xeeb tshaj yog nyob rau hauv qhov kub thiab txias ib puag ncig. HPMC tuaj yeem txhim kho cov dej khaws cia ntawm cov txheej txheem thiab tiv thaiv cov txheej txheem kom qhuav sai heev.
(4) Kev siv HPMC hauv ntau hom txheej txheej
Dej-raws li txheej: HPMC feem ntau yog siv rau thickening, dej tuav thiab leveling hloov nyob rau hauv dej-raws li txheej. Nws tuaj yeem txhim kho kev tsim kho ntawm cov dej-raws li txheej txheej, tshwj xeeb tshaj yog thaum siv nyob rau hauv qhov chaw qhuav sai, nws tuaj yeem txhim kho cov dej tuav lub peev xwm ntawm txheej.
Architectural coatings: Nyob rau hauv architectural coatings, HPMC ua kom lub sij hawm ntev kev tiv thaiv ntawm phab ntsa los yog lub tsev nto los ntawm kev txhim kho cov tawg tiv thaiv thiab durability ntawm txheej. Architectural coatings feem ntau xav tau kev tsim kho ntau dua thiab kev tiv thaiv huab cua, thiab HPMC tuaj yeem pab txhim kho cov khoom no.
High-gloss coatings: High-gloss coatings muaj ntau dua qhov yuav tsum tau rau saum npoo flatness thiab smoothness. Cov nyhuv leveling thiab cov cuab yeej ua yeeb yaj kiab ntawm HPMC tuaj yeem txhim kho qhov zoo ntawm cov txheej, ua kom nws ci dua thiab du dua.
HPMC plays ntau lub luag hauj lwm hauv cov xim thiab txheej, nrog rau cov thickening, dej tuav, leveling, dispersion thiab zaj duab xis tsim. Nws tuaj yeem tsis tsuas yog txhim kho kev tsim kho ntawm cov txheej txheem, tab sis kuj txhim kho qhov zoo thiab ua haujlwm ntawm cov yeeb yaj kiab txheej. Yog li ntawd, HPMC yog dav siv nyob rau hauv niaj hnub txheej txheej formulations thiab yog ib qho tseem ceeb additive los xyuas kom meej cov kev ua tau zoo thiab zoo ntawm txheej.
Post lub sij hawm: Oct-11-2024