HPMC (Hydroxypropyl Methylcellulose)yog ib qho khoom siv polymer uas tau siv dav hauv thaj chaw ntawm cov nplaum. Nws ua lub luag haujlwm tseem ceeb hauv ntau yam ntawm cov nplaum.
1. Thickening tus neeg ua haujlwm ua haujlwm
HPMC yog cov tuab tuab uas tuaj yeem txhim kho qhov viscosity thiab ruaj khov ntawm cov nplaum. Nws cov qauv molecular muaj zog hydrophilicity thiab polysaccharide chains, thiab tuaj yeem tsim cov tshuaj sib xyaw colloidal hauv dej lossis cov kuab tshuaj organic. Cov yam ntxwv no tuaj yeem tiv thaiv cov nplaum los ntawm kev delaminating lossis teeb meem thaum khaws cia thiab siv, yog li ua kom muaj kev sib luag ntawm cov nplaum.
2. Txhim kho adhesion kev ua tau zoo
HPMC muaj cov khoom zoo adhesion thiab tuaj yeem txhim kho cov nplaum nplaum rau lub substrate. Tom qab tau coated rau saum npoo ntawm substrate, HPMC molecules tuaj yeem nkag mus rau hauv cov pores zoo ntawm qhov chaw los txhim kho lub zog sib txuas thiab tsim nyog rau ntau yam ntaub ntawv xws li ntawv, fiber ntau, ntoo thiab ceramics.
3. Film-forming zog
HPMCmuaj cov yeeb yaj kiab zoo heev thiab tuaj yeem tsim cov yeeb yaj kiab tsis tu ncua thiab nrawm tom qab txheej. Cov yeeb yaj kiab no muaj qhov zoo toughness thiab elasticity thiab tuaj yeem muab cov txheej txheem ntxiv kev tiv thaiv rau cov nplaum, txhim kho cov kav ntev thiab dej tsis zoo ntawm daim ntawv cog lus. Tsis tas li ntawd, cov yeeb yaj kiab txo qhov cuam tshuam ntawm qhov chaw sab nraud, xws li cov av noo lossis qhov kub thiab txias hloov, ntawm cov nplaum ua haujlwm.
4. Kev tuav dej
HPMCmuaj peev xwm tuav tau dej zoo heev thiab tuaj yeem kaw cov dej noo hauv cov nplaum kom tiv thaiv dej ntau dhau. Cov yam ntxwv no yog qhov tseem ceeb tshwj xeeb hauv cov dej-raws li cov nplaum thiab cov khoom siv cement, uas tuaj yeem txuas ntxiv lub sijhawm qhib, ua kom yooj yim rau kev tsim kho, thiab zam kom tsis txhob qhuav shrinkage lossis deterioration ntawm kev sib koom ua ke los ntawm kev ua kom dej nrawm.
5. Stabilizer nyhuv
HPMC tuaj yeem txhim kho qhov ruaj khov ntawm cov nplaum nplaum, tiv thaiv kev sib tsoo lossis agglomeration ntawm cov khoom, thiab tswj cov khoom sib xws. Cov pab pawg ua haujlwm hauv nws cov saw molecular kuj tuaj yeem ua haujlwm sib koom ua ke nrog lwm cov khoom los txhim kho kev ruaj ntseg thiab kev ua haujlwm ntawm cov mis.
6. Ib puag ncig phooj ywg
HPMC yog ib yam khoom tau los ntawm kev hloov kho tshuaj ntawm cov cellulose ntuj. Nws yog non-toxic, harmless thiab biodegradable. Nws daim ntawv thov nyob rau hauv adhesives ua raws li niaj hnub kev tiv thaiv ib puag ncig uas yuav tsum tau thiab muaj qhov zoo tseem ceeb tshwj xeeb tshaj yog nyob rau hauv kev tsim kho, ntim thiab zaub mov industries.
7. Kho rheology
Cov khoom tshwj xeeb rheological ntawm HPMC hauv kev daws teeb meem (xws li shear thinning) ua kom cov nplaum nplaum muaj cov khoom siv zoo thaum siv. Nws viscosity txo qis nyob rau hauv siab shear tej yam kev mob, ua rau nws yooj yim rau pleev xim, tshuaj tsuag los yog khawb, thaum nws viscosity rov qab nyob rau hauv qis shear tej yam kev mob, kom ntseeg tau zoo adhesion ntawm cov khoom rau lub substrate.
Cov chaw thov
Raws li cov khoom tseem ceeb ntawm cov nplaum, HPMC tau siv dav hauv cov haujlwm hauv qab no:
Kev tsim kho kev lag luam: xws li cov pobzeb nplaum, cov hmoov sib tov, cov hmoov sib tov qhuav, siv los txhim kho kev tsim kho thiab kev sib txuas lub zog.
Woodworking adhesive: Txhim kho qhov sib txuas ntawm cov ntoo thiab tiv thaiv kev tawg.
Papermaking thiab luam ntawv: siv rau cov ntawv txheej los txhim kho smoothness thiab adhesion.
Textile thiab tawv: siv rau kev ua fiber ntau thiab tawv sib txuas.
HPMCplays ntau lub luag hauj lwm hauv cov nplaum xws li thickening, dej tuav, stabilization, adhesion li thiab tsim zaj duab xis. Nws kuj muaj qhov zoo ntawm kev tiv thaiv ib puag ncig thiab kho rheology. Cov khoom no ua rau nws yog ib qho tseem ceeb thiab tseem ceeb hauv cov txheej txheem nplaum, muab kev txhawb nqa tseem ceeb rau kev txhim kho cov khoom lag luam thiab ua tau raws li cov kev xav tau sib txawv.
Post lub sij hawm: Nov-23-2024